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California-Sunnyvale Lease Agreement (Phase II - Improvements) - BNP Leasing Corp. and Network Appliance Inc.

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<DESCRIPTION>LEASE AGREEMENT (PHASE II - IMPROVEMENTS)
<TEXT>

<PAGE>   1
                                                                Exhibit 10.28


================================================================================

                                 LEASE AGREEMENT
                            (PHASE II - IMPROVEMENTS)


                                     BETWEEN


                             BNP LEASING CORPORATION

                                    ("BNPLC")


                                       AND


                             NETWORK APPLIANCE, INC.


                                     ("NAI")

                                   MAY 3, 1999

                             (SUNNYVALE, CALIFORNIA)

================================================================================

<PAGE>   2


[Phase II - Improvements]


<PAGE>   3
                                TABLE OF CONTENTS



                                                                                           Page
                                                                                           ----
                                                                                     
1.      TERM                                                                                 2
        (a)    Scheduled Term                                                                2
        (b)    Automatic Termination as of the Base Rent Commencement Date Resulting
                 From an Election by NAI to Terminate the Purchase Option and NAI's
                 Initial Remarketing Rights and Obligations                                  2
        (c)   Election by BNPLC to Terminate After an Issue 97-10 Election                   2
        (d)   Election by NAI to Terminate After Accelerating the Designated Sale Date       3
        (e)   Extension of the Term                                                          3

2.      USE AND CONDITION OF THE PROPERTY                                                    4
        (a)    Use                                                                           4
        (b)    Condition of the Property                                                     4
        (c)    Consideration for and Scope of Waiver                                         4

3.      RENT                                                                                 5
        (a)    Base Rent Generally                                                           5
        (b)    Impact of Collateral Upon Formulas                                            5
        (c)    Calculation of and Due Dates for Base Rent                                    5
               (i)    Amount Payable On the Base Rent Commencement Date                      5
               (ii)   Determination of Payment Due Dates, After the Base Rent Commencement
                      Date, Generally                                                        5
               (iii)  Special Adjustments to Base Rent Payment Dates and Periods             6
               (iv)   Base Rent Formula for Periods During Which The Collateral Percentage
                      is 100%                                                                6
               (v)    Base Rent Formula for Periods During Which The Collateral Percentage
                      is Greater Than Zero and Less Than 100%                                7
               (vi)   Base Rent Formula for Periods During Which The Collateral Percentage
                      is Zero                                                                8
        (d)    Additional Rent                                                               8
        (e)    Arrangement Fee                                                               8
        (f)    Commitment Fees                                                               8
        (g)    Administrative Agency Fees                                                    9
        (h)    Issue 97-10 Prepayments                                                       9
        (i)    No Demand or Setoff                                                           9
        (j)    Default Interest and Order of Application                                     9

4.      NATURE OF THIS AGREEMENT                                                             9
        (a)    "Net" Lease Generally                                                         9
        (b)    No Termination                                                               10
        (c)    Tax Reporting                                                                11
        (d)    Characterization of this Improvements Lease                                  11



<PAGE>   4



                                                                                           Page
                                                                                           ----
                                                                                     
5.      PAYMENT OF EXECUTORY COSTS AND LOSSES RELATED TO THE PROPERTY                       12
        (a)    Impositions                                                                  12
        (b)    Increased Costs; Capital Adequacy Charges                                    12
        (c)    NAI's Payment of Other Losses; General Indemnification                       13
        (d)    Exceptions and Qualifications to Indemnities                                 14

6.      CONSTRUCTION                                                                        16
        (a)    Construction Advances; Outstanding Construction Allowance                    16
        (b)    Calculation of Carrying Costs                                                16
        (c)    Limits on the Amount of Carrying Costs                                       17
        (d)    NAI's Right to Control the Construction Project                              17
        (e)    Landlord's Election to Continue Construction                                 17
               (i)    Take Control of the Property                                          17
               (ii)   Continuation of Construction                                          18
               (iii)  Arrange for Turnkey Construction                                      18
               (iv)   Suspension or Termination of Construction                             18
        (f)    Powers Coupled With an Interest                                              19
        (g)    Completion Notice                                                            19

7.      STATUS OF PROPERTY ACQUIRED WITH FUNDS PROVIDED BY BNPLC                            19

8.      ENVIRONMENTAL                                                                       20
        (a)    Environmental Covenants by NAI                                               20
        (b)    Right of BNPLC to do Remedial Work Not Performed by NAI                      20
        (c)    Environmental Inspections and Reviews                                        21
        (d)    Communications Regarding Environmental Matters                               21

9.      INSURANCE REQUIRED AND CONDEMNATION                                                 22
        (a)    Liability Insurance                                                          22
        (b)    Property Insurance                                                           22
        (c)    Failure to Obtain Insurance                                                  22
        (d)    Condemnation                                                                 22
        (e)    Waiver of Subrogation                                                        23

10.     APPLICATION OF INSURANCE AND CONDEMNATION PROCEEDS                                  23
        (a)    Collection and Application of Insurance and Condemnation
                 Proceeds Generally                                                         23
        (b)    Advances of Escrowed Proceeds to NAI                                         24
        (c)    Application of Escrowed Proceeds as a Qualified Prepayment                   24
        (d)    Special Provisions Applicable After a CMA Termination Event or
                 Event of Default                                                           24
        (e)    NAI's Obligation to Restore                                                  24
        (f)    Takings of All or Substantially All of the Property on or after the
                  Base Rent Commencement Date                                               25

11.     ADDITIONAL REPRESENTATIONS, WARRANTIES AND COVENANTS OF NAI CONCERNING
               THE PROPERTY                                                                 25

        (a)    Compliance with Covenants and Laws                                           25
        (b)    Operation of the Property                                                    25
        (c)    Debts for Construction, Maintenance, Operation or Development                26
        (d)    Repair, Maintenance, Alterations and Additions                               27


                                       2

<PAGE>   5



                                                                                           Page
                                                                                           ----
                                                                                     
        (e)    Permitted Encumbrances and Development Documents                             27
        (f)    Books and Records Concerning the Property                                    27

12.     FINANCIAL COVENANTS AND OTHER COVENANTS INCORPORATED BY REFERENCE TO SCHEDULE 1     28

13.     FINANCIAL STATEMENTS AND OTHER REPORTS                                              28
        (a)    Financial Statements; Required Notices; Certificates                         28

14.     ASSIGNMENT AND SUBLETTING BY NAI                                                    29
        (a)    BNPLC's Consent Required                                                     29
        (b)    Standard for BNPLC's Consent to Assignments and Certain Other Matters        30
        (c)    Consent Not a Waiver                                                         30

15.     ASSIGNMENT BY BNPLC                                                                 30
        (a)    Restrictions on Transfers                                                    30
        (b)    Effect of Permitted Transfer or other Assignment by BNPLC                    30

16.     BNPLC's RIGHT OF ACCESS                                                             31

17.     EVENTS OF DEFAULT                                                                   32

18.     REMEDIES                                                                            33
        (a)    Basic Remedies                                                               33
        (b)    Notice Required So Long As the Purchase Option and NAI's Initial
               Remarketing Rights and Obligations Continue Under the Purchase
               Agreement                                                                    35
        (c)    Enforceability                                                               35
        (d)    Remedies Cumulative                                                          35

19.     DEFAULT BY BNPLC                                                                    35

20.     QUIET ENJOYMENT                                                                     36

21.     SURRENDER UPON TERMINATION                                                          36

22.     HOLDING OVER BY NAI                                                                 36

23.     INDEPENDENT OBLIGATIONS EVIDENCED BY THE OTHER OPERATIVE DOCUMENTS                  36




                             EXHIBITS AND SCHEDULES


                                        3
<PAGE>   6


Exhibit A  Legal Description

Exhibit B  Insurance Requirements

Exhibit C  Libor Period Election Form

Schedule 1  Financial Covenants and Other Requirements


                                        4

<PAGE>   7

                                 LEASE AGREEMENT

                            (PHASE II - IMPROVEMENTS)

        This LEASE AGREEMENT (PHASE II- IMPROVEMENTS) (this "IMPROVEMENTS
LEASE"), by and between BNP LEASING CORPORATION, a Delaware corporation
("BNPLC"), and NETWORK APPLIANCE, INC., a California corporation ("NAI"), is
made and dated as of May 3, 1999, the Effective Date. ("EFFECTIVE DATE" and
other capitalized terms used and not otherwise defined in this Improvements
Lease are intended to have the meanings assigned to them in the Common
Definitions and Provisions Agreement (Phase II - Improvements) executed by BNPLC
and NAI contemporaneously with this Improvements Lease. By this reference, the
Common Definitions and Provisions Agreement (Phase II - Improvements) is
incorporated into and made a part of this Improvements Lease for all purposes.)

                                    RECITALS

        Pursuant to the Existing Contract, which covers the Land described in
Exhibit A, BNPLC is acquiring the Land and any appurtenances thereto and all
existing Improvements thereon from Seller contemporaneously with the execution
of this Improvements Lease.

        In anticipation of BNPLC's acquisition of the Land and the existing
Improvements thereon under the Existing Contract, BNPLC and NAI have reached
agreement as to the terms and conditions upon which BNPLC is willing to lease
the existing Improvements and the Improvements to be constructed on the Land as
hereinafter provided, and by this Improvements Lease BNPLC and NAI desire to
evidence such agreement.

                                GRANTING CLAUSES

        BNPLC does hereby LEASE, DEMISE and LET unto NAI for the term
hereinafter set forth all right, title and interest of BNPLC, now owned or
hereafter acquired, in and to:

    (1) any and all Improvements; and

    (2) all easements and other rights appurtenant to the Improvements, whether
    now owned or hereafter acquired by BNPLC.

BNPLC's interest in all property described in clauses (1) and (2) above are
hereinafter referred to collectively as the "REAL PROPERTY". The Real Property
does not include the Land itself, it being understood that the Other Lease
Agreement constitutes a separate lease of the Land and the appurtenances
thereto, and only the Land and the appurtenances thereto, from BNPLC to NAI.

        To the extent, but only to the extent, that assignable rights or
interests in, to or under the following have been or will be acquired by BNPLC
under the Existing Contract or acquired by BNPLC pursuant to Paragraph 7 below,
BNPLC also hereby grants and assigns to NAI for the term of this Improvements
Lease the right to use and enjoy (and, in the case of contract rights, to
enforce) such rights or interests of BNPLC:

        (a) any goods, equipment, furnishings, furniture and other tangible
    personal property of whatever nature that are located on the Land and all
    renewals or replacements of or substitutions for any of the foregoing;



                                       5
<PAGE>   8

        (b) the benefits, if any, conferred upon the owner of the Real Property
    by the Permitted Encumbrances (including Existing Space Leases) and
    Development Documents; and

        (c) any permits, licenses, franchises, certificates, and other rights
    and privileges against third parties (including the lessees under the
    Existing Space Leases) related to the Real Property.

Such rights and interests of BNPLC, whether now existing or hereafter arising,
are hereinafter collectively called the "PERSONAL PROPERTY". The Real Property
and the Personal Property are hereinafter sometimes collectively called the
"PROPERTY."

         However, the leasehold estate conveyed hereby and NAI's rights
hereunder are expressly made subject and subordinate to the terms and conditions
of this Improvements Lease, to the Permitted Encumbrances (including the
Existing Space Leases), and to any other claims or encumbrances not constituting
Liens Removable by BNPLC.

                          GENERAL TERMS AND CONDITIONS

        The Property is leased by BNPLC to NAI and is accepted and is to be used
and possessed by NAI upon and subject to the following terms and conditions:

1. TERM.

(a) Scheduled Term.  The term of this Improvements Lease (the "TERM") shall
commence on and include the Effective Date, and end on the first Business Day of
February, 2004, unless sooner terminated as expressly herein provided.

(b) Automatic Termination as of the Base Rent Commencement Date Resulting From
an Election by NAI to Terminate the Purchase Option and NAI's Initial
Remarketing Rights and Obligations.  If NAI terminates the Purchase Option and
NAI's Initial Remarketing Rights and Obligations prior to the Base Rent
Commencement Date pursuant to subparagraph 4(B) of the Purchase Agreement, then
this Improvements Lease shall terminate automatically on the Base Rent
Commencement Date. Just as any such termination of the Purchase Option and NAI's
Initial Remarketing Rights and Obligations shall be subject to the condition
(set forth in subparagraph 4(B) of the Purchase Agreement) that NAI pay an Issue
97-10 Prepayment to BNPLC, so too will the termination of this Improvements
Lease pursuant to this subparagraph be subject the condition that NAI make the
Issue 97-10 Prepayment to BNPLC.

(c) Election by BNPLC to Terminate After an Issue 97-10 Election.  By notice to
NcI BNPLC shall be entitled to terminate this Improvements Lease, as BNPLC deems
appropriate in its sole and absolute discretion, at any time after receiving a
notice given by NAI to make any Issue 97-10 Election. Upon any termination of
this Improvements Lease by BNPLC pursuant to this subparagraph, NAI shall become
obligated to pay to BNPLC an Issue 97-10 Prepayment, which obligation will
survive the termination of this Improvements Lease.

(d) Election by NAI to Terminate After Accelerating the Designated Sale Date.
Provided NAI has not made any Issue 97-10 Election, NAI shall be entitled to
accelerate the Designated Sale Date (and thus accelerate the purchase of BNPLC's
interest in the Property by NAI or by an Applicable Purchaser pursuant to the
Purchase Agreement) by sending a notice to BNPLC as provided in clause (2) of
the definition of "Designated Sale Date" in the Common Definitions and
Provisions Agreement (Phase II - Improvements). In the event, because of NAI's
election to so accelerate the Designated Sale Date or for any other reason, the
Designated Sale Date occurs before the end of the scheduled Term, NAI may
terminate this Improvements Lease on or after the Designated Sale Date;
provided, however, as a condition to any such termination by NAI, NAI must have
done the following prior to the termination:


                                       2

<PAGE>   9

    (i) purchased or caused an Applicable Purchaser to purchase the Property
    pursuant to the Purchase Agreement and satisfied all of NAI's other
    obligations under the Purchase Agreement;

    (ii) paid to BNPLC all Base Rent, all Commitment Fees and all other Rent due
    on or before or accrued through the Designated Sale Date; and

    (iii) paid any Breakage Costs caused by BNPLC's sale of the Property
    pursuant to the Purchase Agreement.

(e) Extension of the Term.  The Term may be extended at the option of NAI for
two successive periods of five years each; provided, however, that prior to any
such extension the following conditions must have been satisfied: (A) at least
ninety days prior to the commencement of any such extension, BNPLC and NAI must
have agreed in writing upon, and received the consent and approval of BNPLC's
Parent and all other Participants to (1) a corresponding extension not only to
the date for the expiration of the Term specified above in this Section, but
also to the date specified in clause (1) of the definition of Designated Sale
Date in the Common Definitions and Provisions Agreement (Phase II -
Improvements), and (2) an adjustment to the Rent that NAI will be required to
pay for the extension, it being expected that the Rent for the extension may be
different than the Rent required for the original Term, and it being understood
that the Rent for any extension must in all events be satisfactory to both BNPLC
and NAI, each in its sole and absolute discretion; (B) no Event of Default shall
have occurred and be continuing at the time of NAI's exercise of its option to
extend; (C) prior to any such extension, NAI must have completed the
Construction Project in accordance with the Construction Management Agreement
and must not have made any Issue 97-10 Election; and (D) immediately prior to
any such extension, this Improvements Lease must remain in effect. With respect
to the condition that BNPLC and NAI must have agreed upon the Rent required for
any extension of the Term, neither NAI nor BNPLC is willing to submit itself to
a risk of liability or loss of rights hereunder for being judged unreasonable.
Accordingly, both NAI and BNPLC hereby disclaim any obligation express or
implied to be reasonable in negotiating the Rent for any such extension. Subject
to the changes to the Rent payable during any extension of the Term as provided
in this Paragraph, if NAI exercises its option to extend the Term as provided in
this Paragraph, this Improvements Lease shall continue in full force and effect,
and the leasehold estate hereby granted to NAI shall continue without
interruption and without any loss of priority over other interests in or claims
against the Property that may be created or arise after the date hereof and
before the extension.

2. USE AND CONDITION OF THE PROPERTY.

(a) Use. Subject to the Permitted Encumbrances, the Development Documents and
the terms hereof, NAI may use and occupy the Property during the Term, but only
for the following purposes and other lawful purposes incidental thereto:

    (i) construction and development of the Construction Project;

    (ii) administrative and office space;

    (iii) activities related to NAI's research and development or production of
    products that are of substantially the same type and character as those
    regularly sold by NAI in the ordinary course of its business as of the
    Effective Date;

    (iv) cafeteria, library and other support facilities that NAI may provide to
    its employees; and

    (v) other lawful purposes (including NAI's research and development or
    production of products that are not of substantially the same type and
    character as those regularly sold by NAI in the ordinary course of its
    business as of the Effective Date) approved in advance and in writing by
    BNPLC, which approval will not be unreasonably withheld after completion of
    the Construction Project (but NAI acknowledges that BNPLC's withholding of
    such approval shall be reasonable if BNPLC determines in good faith that (1)
    giving the approval may materially increase BNPLC's risk of liability



                                       3
<PAGE>   10

    for any existing or future environmental problem, or (2) giving the approval
    is likely to substantially increase BNPLC's administrative burden of
    complying with or monitoring NAI's compliance with the requirements of this
    Improvements Lease or other Operative Documents).

(b) Condition of the Property. NAI ACKNOWLEDGES THAT IT HAS CAREFULLY AND FULLY
INSPECTED THE PROPERTY AND ACCEPTS THE PROPERTY IN ITS PRESENT STATE, AS IS, AND
WITHOUT ANY REPRESENTATION OR WARRANTY, EXPRESS OR IMPLIED, AS TO THE CONDITION
OF SUCH PROPERTY OR AS TO THE USE WHICH MAY BE MADE THEREOF. NAI ALSO ACCEPTS
THE PROPERTY WITHOUT ANY COVENANT, REPRESENTATION OR WARRANTY, EXPRESS OR
IMPLIED, BY BNPLC OR ITS AFFILIATES REGARDING THE TITLE THERETO OR THE RIGHTS OF
ANY PARTIES IN POSSESSION OF ANY PART THEREOF, EXCEPT AS EXPRESSLY SET FORTH IN
PARAGRAPH 20. BNPLC SHALL NOT BE RESPONSIBLE FOR ANY LATENT OR OTHER DEFECT OR
CHANGE OF CONDITION IN THE LAND OR IN IMPROVEMENTS, FIXTURES AND PERSONAL
PROPERTY FORMING A PART OF THE PROPERTY OR FOR ANY VIOLATIONS WITH RESPECT
THERETO OF APPLICABLE LAWS. FURTHER, THOUGH NAI MAY OBTAIN FROM THIRD PARTIES
ANY FACILITIES OR SERVICES TO WHICH NAI IS ENTITLED BY REASON OF THE ASSIGNMENT
AND LEASE OF PERSONAL PROPERTY SET FORTH ON PAGE 2 OF THIS IMPROVEMENTS LEASE,
BNPLC SHALL NOT BE REQUIRED TO FURNISH TO NAI ANY FACILITIES OR SERVICES OF ANY
KIND, INCLUDING WATER, STEAM, HEAT, GAS, AIR CONDITIONING, ELECTRICITY, LIGHT OR
POWER.

(c) Consideration for and Scope of Waiver.  The provisions of subparagraph 2.(b)
above have been negotiated by BNPLC and NAI after due consideration for the Rent
payable hereunder and are intended to be a complete exclusion and negation of
any representations or warranties of BNPLC or its Affiliates, express or
implied, with respect to the Property that may arise pursuant to any law now or
hereafter in effect or otherwise, except as expressly set forth herein.

However, such exclusion of representations and warranties by BNPLC is not
intended to impair any representations or warranties made by other parties, the
benefit of which may pass to NAI during the Term because of the definition of
Personal Property and Property above.

3. RENT.

(a) Base Rent Generally. On the Base Rent Commencement Date and on each Base
Rent Date through the end of the Term, NAI shall pay BNPLC rent ("BASE RENT").
Each payment of Base Rent must be received by BNPLC no later than 10:00 a.m.
(Pacific time) on the date it becomes due; if received after 10:00 a.m. (Pacific
time) it will be considered for purposes of this Improvements Lease as received
on the next following Business Day. At least five days prior to any Base Rent
Commencement Date or Base Rent Date upon which an installment of Base Rent shall
become due, BNPLC shall notify NAI in writing of the amount of each installment,
calculated as provided below. Any failure by BNPLC to so notify NAI, however,
shall not constitute a waiver of BNPLC's right to payment, but absent such
notice NAI shall not be in default hereunder for any underpayment resulting
therefrom if NAI, in good faith, reasonably estimates the payment required,
makes a timely payment of the amount so estimated and corrects any underpayment
within three Business Days after being notified by BNPLC of the underpayment.

(b) Impact of Collateral Upon Formulas.  To ease the administrative burden of
this Improvements Lease and the Pledge Agreement, the formulas for calculating
Base Rent set out below in subparagraph 3.(c) reflect a reduction in the Base
Rent equal to the interest that would accrue on any Collateral provided in
accordance with the requirements of the Pledge Agreement from time to time if
the Accounts (as defined in the Pledge Agreement) bore interest at the Effective
Rate. BNPLC has agreed to such reduction to provide NAI with the economic
equivalent of interest on such Collateral, and in return NAI has agreed to the
provisions of the Pledge Agreement that excuse the actual payment of interest on
the Accounts. By incorporating such reduction of Base Rent into the formulas
below, and by providing for noninterest bearing Accounts in the Pledge
Agreement, the parties will avoid an unnecessary and cumbersome periodic
exchange of equal payments. It is not, however, the intent of BNPLC or NAI to
understate Base Rent or interest for financial reporting purposes. Accordingly,
for



                                       4
<PAGE>   11

purposes of any financial reports that this Improvements Lease requires of NAI
from time to time, NAI may report Base Rent as if there had been no such
reduction and as if the Collateral from time to time provided in accordance with
the requirements of the Pledge Agreement had been maintained in Accounts bearing
interest at the Effective Rate.

(c) Calculation of and Due Dates for Base Rent.  Payments of Base Rent shall be
calculated and become due as follows:

    (i) Amount Payable On the Base Rent Commencement Date.  The Base Rent
    payable on the Base Rent Commencement Date shall equal the difference (if
    any) between (a) the total amount that would have been added to the
    Outstanding Construction Allowance as Carrying Costs on such date if not for
    the limit set forth in subparagraph 6.(c), and (b) the Carrying Costs
    actually added on such date to the Outstanding Construction Allowance.

    (ii) Determination of Payment Due Dates, After the Base Rent Commencement
    Date, Generally.  For all Base Rent Periods subject to a LIBOR Period
    Election of one month or three months, Base Rent shall be due in one
    installment on the Base Rent Date upon which the Base Rent Period ends. For
    Base Rent Periods subject to a LIBOR Period Election of six months, Base
    Rent shall be payable in two installments, with the first installment
    becoming due on the Base Rent Date that occurs on the first Business Day of
    the third calendar month following the commencement of such Base Rent
    Period, and with the second installment becoming due on the Base Rent Date
    upon which the Base Rent Period ends.

    (iii) Special Adjustments to Base Rent Payment Dates and Periods.
    Notwithstanding the foregoing:

           a) Any Base Rent Period that begins before, and does not otherwise
           end before, a Failed Collateral Test Date shall end upon but not
           include such Failed Collateral Test Date, and such Failed Collateral
           Test Date shall constitute a Base Rent Date, upon which NAI must pay
           all accrued, unpaid Base Rent for the Base Rent Period just ended.

           b) Consistent with clause (3) of the definition of LIBOR Period
           Election in the Common Definitions and Provisions Agreement (Phase II
           - Improvements), each successive Base Rent Date after any such Failed
           Collateral Test Date shall be the first Business Day of the first
           calendar month following the calendar month which includes the
           preceding Base Rent Date, so long as any Mandatory Collateral Period
           shall continue.

           c) In addition to Base Rent due on a Failed Collateral Test Date, NAI
           must pay the Breakage Costs, if any, resulting from any early ending
           of a Base Rent Period on the Failed Collateral Test Date pursuant to
           the preceding clause 3.(c)(iii)(a).

           d) If NAI or any Applicable Purchaser purchases BNPLC's interest in
           the Property pursuant to the Purchase Agreement, any accrued unpaid
           Base Rent and all outstanding Additional Rent shall be due on the
           date of purchase in addition to the purchase price and other sums due
           BNPLC under the Purchase Agreement.

    (iv) Base Rent Formula for Periods During Which The Collateral Percentage is
    100%. Each installment of Base Rent payable for any Base Rent Period during
    which the Collateral Percentage is one hundred percent (100%) shall equal:

            -   Stipulated Loss Value on the first day of such Base Rent Period,
                times

            -   the Secured Spread for the period from and including the
                preceding Base Rent Date to but not including the Base Rent Date
                upon which the installment is due, times



                                       5
<PAGE>   12

            -   the number of days in the period from and including the
                preceding Base Rent Date to but not including the Base Rent Date
                upon which the installment is due, divided by

            -   three hundred sixty.

        Assume, only for the purpose of illustration: that the Collateral
    Percentage for a hypothetical Base Rent Period is one hundred percent
    (100%); that prior to the first day of such Base Rent Period the
    Construction Allowance has been fully funded, but a total of $4,250,000 of
    Qualified Prepayments have been received by BNPLC, leaving a Stipulated Loss
    Value of $15,000,000; that the Secured Spread is thirty basis points (30/100
    of 1%); and that such Base Rent Period contains exactly thirty days. Under
    such assumptions, the Base Rent for the hypothetical Base Rent Period will
    equal:

                      $15,000,000 x .30% x 30/360 = $3,750

    (i) Base Rent Formula for Periods During Which The Collateral Percentage is
    Greater Than Zero and Less Than 100% . Each installment of Base Rent payable
    for any Base Rent Period during which the Collateral Percentage is greater
    than zero and less than one hundred percent (100%) shall equal:

        -   Stipulated Loss Value on the first day of such Base Rent Period,
            times

        -   the sum of:

                      (A) the product of:

                          (1) the Collateral Percentage for such Base Rent
                              Period, times

                          (2) the Secured Spread for the period from and
                              including the preceding Base Rent Date to but not
                              including the Base Rent Date upon which the
                              installment is due, plus

                      (B) the product of:

                          (1) one minus the Collateral Percentage for such Base
                              Rent Period, times

                          (2) the sum of (a) the Effective Rate with respect to
                              such Base Rent Period, plus (b) the Unsecured
                              Spread for the period from and including the
                              preceding Base Rent Date to but not including the
                              Base Rent Date upon which the installment is due,
                              times

        -   the number of days in the period from and including the preceding
            Base Rent Date to but not including the Base Rent Date upon which
            the installment is due, divided by

        -   three hundred sixty.

        Assume, only for the purpose of illustration: that the Collateral
    Percentage for a hypothetical Base Rent Period is forty percent (40%); that
    prior to the first day of such Base Rent Period the Construction Allowance
    has been fully funded, but a total of $4,250,000 of Qualified Prepayments
    have been received by BNPLC, leaving a Stipulated Loss Value of



                                       6
<PAGE>   13
    $15,000,000; that the Effective Rate for the Base Rent Period is 6%; that
    the Secured Spread is thirty basis points (30/100 of 1%); that upon the
    commencement of such Base Rent Period the Unsecured Spread is one hundred
    fifty basis points (150/100 of 1%); and that such Base Rent Period contains
    exactly thirty days. Under such assumptions, the Base Rent for the
    hypothetical Base Rent Period will equal:

  $15,000,000 x {(40% x .30%) + ([1 - 40%] x [6% + 1.50%])} x 30/360 = $57,750

    (i) Base Rent Formula for Periods During Which The Collateral Percentage is
    Zero. Each installment of Base Rent payable for any Base Rent Period during
    which the Collateral Percentage is zero shall equal:

        -   Stipulated Loss Value on the first day of such Base Rent Period,
            times

        -   the sum of (a) the Effective Rate with respect to such Base Rent
            Period, plus (b) the Unsecured Spread for the period from and
            including the preceding Base Rent Date to but not including the Base
            Rent Date upon which the installment is due, times

        -   the number of days in the period from and including the preceding
            Base Rent Date to but not including the Base Rent Date upon which
            the installment is due, divided by

        -   three hundred sixty.

        Assume, only for the purpose of illustration: that the Collateral
    Percentage for a hypothetical Base Rent Period is zero percent (0%); that
    prior to the first day of such Base Rent Period the Construction Allowance
    has been fully funded, but a total of $4,250,000 of Qualified Prepayments
    have been received by BNPLC, leaving a Stipulated Loss Value of $15,000,000;
    that the Effective Rate for the Base Rent Period is 6%; that the Unsecured
    Spread is one hundred fifty basis points (150/100 of 1%) upon the
    commencement of such Base Rent Period; and that such Base Rent Period
    contains exactly thirty days. Under such assumptions, the Base Rent for the
    hypothetical Base Rent Period will equal:

                  $15,000,000 x (6% + 1.50%) x 30/360 = $93,750

(d) Additional Rent.  All amounts which NAI is required to pay to or on behalf
of BNPLC pursuant to this Improvements Lease, together with every charge,
premium, interest and cost set forth herein which may be added for nonpayment or
late payment thereof, shall constitute rent (all such amounts, other than Base
Rent, are herein called "ADDITIONAL RENT", and together Base Rent and Additional
Rent are herein sometimes called "RENT").

(e) Arrangement Fee.  Upon execution and delivery of this Improvements Lease by
BNPLC, an Arrangement Fee (the "ARRANGEMENT FEE") will be paid to BNPLC from the
Initial Funding Advance (and thus be included in Stipulated Loss Value) in the
amount provided in the letter dated as of March 3, 1999 from BNPLC to NAI.

(f) Commitment Fees. For each Construction Period NAI shall pay BNPLC a fee (a
"COMMITMENT FEE") from Construction Advances made pursuant to the Construction
Management Agreement equal to:

        -   the Commitment Fee Rate for such Construction Period, times an
            amount equal to:

        (i) the Maximum Construction Allowance, less

       (ii) the Funded Construction Allowance on the first day of such
            Construction Period; times

        -   the number of days in such Construction Period; divided by



                                       7
<PAGE>   14
        -   three hundred sixty.

NAI shall pay Commitment Fees in arrears on the first Business Day of May,
August, November and February of each calendar year, beginning with the first
Business Day of August, 1999 and continuing regularly throughout the Term so
long as Commitment Fees have accrued and remain unpaid. However, if any
Commitment Fees shall have accrued and remain unpaid on the Designated Sale
Date, such accrued unpaid Commitment Fees shall be due on the Designated Sale
Date.

(g) Administrative Agency Fees.  Upon execution and delivery of this
Improvements Lease by BNPLC, an administrative agency fee (an "ADMINISTRATIVE
AGENCY FEE") will be paid to BNPLC from the Initial Funding Advance (and thus be
included in Stipulated Loss Value) in the amount provided in the letter dated as
of March 3, 1999 from BNPLC to NAI. Also, on each anniversary of the date
hereof, NAI shall pay to BNPLC an administrative agency fee (also, an
"ADMINISTRATIVE AGENCY FEE") in the amount set forth in the letter agreement
dated as of March 3, 1999 from BNPLC to NAI.

(h) Issue 97-10 Prepayments.  Following any Issue 97-10 Election or any CMA
Termination Event under (and as defined in) the Construction Management
Agreement, NAI shall make an Issue 97-10 Prepayment to BNPLC within three
Business Days after receipt of any demand for such a payment. BNPLC may demand
an Issue 97-10 Prepayment pursuant to this subparagraph at any time and from
time to time (as Project Costs increase) after any Issue 97-10 Election or CMA
Termination Event.

(i) No Demand or Setoff.  Except as expressly provided herein, NAI shall pay all
Rent without notice or demand and without counterclaim, deduction, setoff or
defense.

(j) Default Interest and Order of Application.  All Rent shall bear interest, if
not paid when first due, at the Default Rate in effect from time to time from
the date due until paid; provided, that nothing herein contained will be
construed as permitting the charging or collection of interest at a rate
exceeding the maximum rate permitted under Applicable Laws. BNPLC shall be
entitled to apply any amounts paid by or on behalf of NAI against any Rent then
past due in the order the same became due or in such other order as BNPLC may
elect.

4. NATURE OF THIS AGREEMENT.

(a) "Net" Lease Generally.  Subject only to the exceptions listed in
subparagraph 5.(d) below, it is the intention of BNPLC and NAI that Base Rent,
the Arrangement Fees, any Upfront Syndication Fees, Administrative Agency Fees,
Commitment Fees and other payments herein specified shall be absolutely net to
BNPLC and that NAI shall pay all costs, expenses and obligations of every kind
relating to the Property or this Improvements Lease which may arise or become
due, including: (i) any taxes payable by virtue of BNPLC's receipt of amounts
paid to or on behalf of BNPLC in accordance with Paragraph ; (ii) any amount for
which BNPLC is or becomes liable with respect to the Permitted Encumbrances or
the Development Documents; and (iii) any costs incurred by BNPLC (including
Attorneys' Fees) because of BNPLC's acquisition or ownership of any interest in
the Property or because of this Improvements Lease or the transactions
contemplated herein.

However, neither this subparagraph 4.(a) nor the indemnity in this subparagraph
5.(c)(i) shall be construed to make NAI liable for (I) an allocation of general
overhead or internal administrative expenses of BNPLC or any other Interested
Party or (II) any duplicate payment of the same Loss to both BNPLC and another
Interested Party. (If, for example, BNPLC were required to make a $10 fine
because of a failure of the Property to comply with Applicable Laws, and a
Participant were required by the Participation Agreement to reimburse BNPLC for
20% of the $10, NAI would not be required by this subparagraph 4.(a) or by
subparagraph 5.(c)(i) to pay both $10 to BNPLC and $2 to the Participant on
account of the fine.)


                                       8
<PAGE>   15
(b) No Termination.  Except as expressly provided in this Improvements Lease
itself, this Improvements Lease shall not terminate, nor shall NAI have any
right to terminate this Improvements Lease, nor shall NAI be entitled to any
abatement of the Rent, nor shall the obligations of NAI under this Improvements
Lease be excused, for any reason whatsoever, including any of the following: (i)
any damage to or the destruction of all or any part of the Property from
whatever cause, (ii) the taking of the Property or any portion thereof by
eminent domain or otherwise for any reason, (iii) the prohibition, limitation or
restriction of NAI's use or development of all or any portion of the Property or
any interference with such use by governmental action or otherwise, (iv) any
eviction of NAI or of anyone claiming through or under NAI, (v) any default on
the part of BNPLC under this Improvements Lease or under any other agreement to
which BNPLC and NAI are parties, (vi) the inadequacy in any way whatsoever of
the design, construction, assembly or installation of any improvements, fixtures
or tangible personal property included in the Property (it being understood that
BNPLC has not made, does not make and will not make any representation express
or implied as to the adequacy thereof), (vii) any latent or other defect in the
Property or any change in the condition thereof or the existence with respect to
the Property of any violations of Applicable Laws, (viii) any breach of the
Existing Space Leases by any of the lessees thereunder, or (ix) any other cause
whether similar or dissimilar to the foregoing. It is the intention of the
parties hereto that the obligations of NAI hereunder shall be separate and
independent of the covenants and agreements of BNPLC, that Base Rent and all
other sums payable by NAI hereunder shall continue to be payable in all events
and that the obligations of NAI hereunder shall continue unaffected, unless the
requirement to pay or perform the same shall have been terminated or limited
pursuant to an express provision of this Improvements Lease. Without limiting
the foregoing, NAI waives to the extent permitted by Applicable Laws, except as
otherwise expressly provided herein, all rights to which NAI may now or
hereafter be entitled by law (including any such rights arising because of any
implied "warranty of suitability" or other warranty under Applicable Laws) (i)
to quit, terminate or surrender this Improvements Lease or the Property or any
part thereof or (ii) to any abatement, suspension, deferment or reduction of the
Rent.

        However, nothing in this subparagraph 4.(b) shall be construed as a
waiver by NAI of any right NAI may have at law or in equity to the following
remedies, whether because of BNPLC's failure to remove a Lien Removable by BNPLC
or because of any other default by BNPLC under this Improvements Lease that
continues beyond the period for cure provided in Paragraph 19: (i) the recovery
of monetary damages, (ii) injunctive relief in case of the violation, or
attempted or threatened violation, by BNPLC of any of the express covenants,
agreements, conditions or provisions of this Improvements Lease which are
binding upon BNPLC (including the confidentiality provisions set forth in
subparagraph 16.(c) below), or (iii) a decree compelling performance by BNPLC of
any of the express covenants, agreements, conditions or provisions of this
Improvements Lease which are binding upon BNPLC.

(c) Tax Reporting.  BNPLC and NAI shall report this Improvements Lease and the
Purchase Agreement for federal income tax purposes as a conditional sale unless
prohibited from doing so by the Internal Revenue Service. If the Internal
Revenue Service shall challenge BNPLC's characterization of this Improvements
Lease and the Purchase Agreement as a conditional sale for federal income tax
reporting purposes, BNPLC shall notify NAI in writing of such challenge and
consider in good faith any reasonable suggestions by NAI about an appropriate
response. In any event, NAI shall (subject only to the limitations set forth in
this subparagraph) indemnify and hold harmless BNPLC from and against all
liabilities, costs, additional taxes (other than Excluded Taxes) and other
expenses that may arise or become due because of such challenge or because of
any resulting recharacterization required by the Internal Revenue Service,
including any additional taxes that may become due upon any sale under the
Purchase Agreement to the extent (if any) that such additional taxes are not
offset by tax savings resulting from additional depreciation deductions or other
tax benefits to BNPLC of the recharacterization. If BNPLC receives a written
notice of any challenge by the Internal Revenue Service that BNPLC believes will
be covered by this Paragraph, then BNPLC shall promptly furnish a copy of such
notice to NAI. The failure to so provide a copy of the notice to NAI shall not
excuse NAI from its obligations under this Paragraph; provided, that if none of
the officers of NAI and none of the employees of NAI responsible for tax matters
are aware of the challenge described in the notice and such failure by BNPLC
renders unavailable defenses that NAI might otherwise assert, or precludes
actions that NAI might otherwise take, to minimize its obligations hereunder,
then NAI shall be excused from its obligation to indemnify BNPLC against
liabilities, costs, additional taxes and other expenses, if any, which would not
have been incurred but for such failure. For example, if BNPLC



                                       9
<PAGE>   16
fails to provide NAI with a copy of a notice of a challenge by the Internal
Revenue Service covered by the indemnities set out in this Improvements Lease
and NAI is not otherwise already aware of such challenge, and if as a result of
such failure BNPLC becomes liable for penalties and interest covered by the
indemnities in excess of the penalties and interest that would have accrued if
NAI had been promptly provided with a copy of the notice, then NAI will be
excused from any obligation to BNPLC to pay the excess.

(d) Characterization of this Improvements Lease.  For purposes of determining
the appropriate financial accounting for this Improvements Lease and for
purposes of determining their respective rights and remedies under state law,
BNPLC and NAI believe and intend that (i) this Improvements Lease constitutes a
true lease, not a mere financing arrangement, enforceable in accordance with its
express terms, and the preceding subparagraph is not intended to affect the
enforcement of any other provisions of this Improvements Lease or the Purchase
Agreement, and (ii) the Purchase Agreement shall constitute a separate and
independent contract, enforceable in accordance with the express terms and
conditions set forth therein. In this regard, NAI acknowledges that NAI asked
BNPLC to participate in the transactions evidenced by this Improvements Lease
and the Purchase Agreement as a landlord and owner of the Property, not as a
lender. Although other transactions might have been used to accomplish similar
results, NAI expects to receive certain material accounting and other advantages
through the use of a lease transaction. Accordingly, and notwithstanding the
reporting for income tax purposes described in the preceding subparagraph, NAI
cannot equitably deny that this Improvements Lease and the Purchase Agreement
should be construed and enforced in accordance with their respective terms,
rather than as a mortgage or other security device, in any action brought by
BNPLC to enforce this Improvements Lease or the Purchase Agreement.

5. PAYMENT OF EXECUTORY COSTS AND LOSSES RELATED TO THE PROPERTY.

(a) Impositions.  Subject only to the exceptions listed in subparagraph 5.(d)
below, NAI shall pay or cause to be paid prior to delinquency all ad valorem
taxes assessed against the Property and other Impositions. If requested by BNPLC
from time to time, NAI shall furnish BNPLC with receipts showing payment of all
Impositions prior to the applicable delinquency date therefor.

Notwithstanding the foregoing, NAI may in good faith, by appropriate
proceedings, contest the validity, applicability or amount of any asserted
Imposition, and pending such contest NAI shall not be deemed in default under
any of the provisions of this Improvements Lease because of the Imposition if
(1) NAI diligently prosecutes such contest to completion in a manner reasonably
satisfactory to BNPLC, and (2) NAI promptly causes to be paid any amount
adjudged by a court of competent jurisdiction to be due, with all costs,
penalties and interest thereon, promptly after such judgment becomes final;
provided, however, in any event each such contest shall be concluded and the
contested Impositions must be paid by NAI prior to the earlier of (i) the date
that any criminal prosecution is instituted or overtly threatened against BNPLC
or its directors, officers or employees because of the nonpayment thereof or
(ii) the date any writ or order is issued under which any property owned or
leased by BNPLC (including the Property) may be seized or sold or any other
action is taken against BNPLC or against any property owned or leased by BNPLC
because of the nonpayment thereof, or (iii) any Designated Sale Date upon which,
for any reason, NAI or an Affiliate of NAI or any Applicable Purchaser shall not
purchase BNPLC's interest in the Property pursuant to the Purchase Agreement for
a price to BNPLC (when taken together with any additional payments made by NAI
pursuant to Paragraph 1(A)(2) of the Purchase Agreement, in the case of a
purchase by an Applicable Purchaser) equal to the Break Even Price.

(b) Increased Costs; Capital Adequacy Charges.  Subject only to the exceptions
listed in subparagraph 5.(d) below:

    (i) If after the Effective Date there shall be any increase in the cost to
    BNPLC's Parent or any other Participant agreeing to make or making, funding
    or maintaining advances to BNPLC in connection with the Property because of
    any Banking Rules Change, then NAI shall from time to time, pay to BNPLC for
    the account of BNPLC's Parent or such other




                                       10
<PAGE>   17
    Participant, as the case may be, additional amounts sufficient to compensate
    BNPLC's Parent or the Participant for such increased cost. An increase in
    costs resulting from any imposition or increase of reserve requirements
    applicable to Collateral held from time to time by BNPLC's Parent or other
    Participants pursuant to the Pledge Agreement would be an increase covered
    by the preceding sentence. A certificate as to the amount of such increased
    cost, submitted to BNPLC and NAI by BNPLC's Parent or the other Participant,
    shall be conclusive and binding upon NAI, absent clear and demonstrable
    error.

    (ii) BNPLC's Parent or any other Participant may demand additional payments
    ("CAPITAL ADEQUACY CHARGES") if BNPLC's Parent or the other Participant
    determines that any Banking Rules Change affects the amount of capital to be
    maintained by it and that the amount of such capital is increased by or
    based upon the existence of advances made or to be made to BNPLC to permit
    BNPLC to maintain BNPLC's investment in the Property or to make Construction
    Advances. To the extent that BNPLC's Parent or another Participant demands
    Capital Adequacy Charges as compensation for the additional capital
    requirements reasonably allocable to such investment or advances, NAI shall
    pay to BNPLC for the account of BNPLC's Parent or the other Participant, as
    the case may be, the amount so demanded. Without limiting the foregoing,
    BNPLC and NAI hereby acknowledge and agree that the provisions for
    calculating Base Rent set forth herein reflect the assumption that the
    Pledge Agreement will cause a zero percent (0%) risk weight to be assigned
    to a percentage (equal to the Collateral Percentage) of the collective
    investment of BNPLC and the Participants in the Property pursuant to 12 Code
    of Federal Regulations, part 225, as from time to time supplemented or
    amended, or pursuant to any other similar or successor statute or regulation
    applicable to BNPLC and the Participants. If and so long as such risk weight
    is increased the assumed amount of zero percent (0%) because of a Banking
    Rules Change, Capital Adequacy Charges may be collected to yield the same
    rate of return to BNPLC, BNPLC's Parent and any other Participants (net of
    their costs of maintaining required capital) that they would have enjoyed
    from this Improvements Lease absent such increase.

    (iii) Any amount required to be paid by NAI under this subparagraph 5.(b)
    shall be due ten days after a demand for such payment is received by NAI.

(c) NAI's Payment of Other Losses; General Indemnification. Subject only to the
exceptions listed in subparagraph 5.(d) below:

    (i)  All Losses (including Environmental Losses) asserted against or
    incurred or suffered by BNPLC or other Interested Parties at any time and
    from time to time by reason of, in connection with or arising out of (A)
    their ownership or alleged ownership of any interest in the Property or the
    Rents, (B) the use and operation of the Property, (C) the negotiation,
    administration or enforcement of the Operative Documents, (D) the making of
    Funding Advances, (E) the Construction Project, (F) the breach by NAI of
    this Improvements Lease or any other document executed by NAI in connection
    herewith, (G) any failure of the Property or NAI itself to comply with
    Applicable Laws, (H) Permitted Encumbrances (including the Existing Space
    Leases), (I) Hazardous Substance Activities, including those occurring prior
    to Effective Date, (J) any obligations under the Existing Contract that
    survive the closing thereunder, or (K) any bodily or personal injury or
    death or property damage occurring in or upon or in the vicinity of the
    Property through any cause whatsoever, shall be paid by NAI, and NAI shall
    indemnify and defend BNPLC and other Interested Parties from and against all
    such Losses.

    (ii) THE INDEMNITIES AND RELEASES PROVIDED HEREIN FOR THE BENEFIT OF BNPLC
    AND OTHER INTERESTED PARTIES, INCLUDING THE INDEMNITY SET FORTH IN THE
    PRECEDING SUBPARAGRAPH 5.(c)(i), SHALL APPLY EVEN IF AND WHEN THE SUBJECT
    MATTERS OF THE INDEMNITIES AND RELEASES ARE CAUSED BY OR ARISE OUT OF THE
    NEGLIGENCE OR STRICT LIABILITY OF BNPLC OR ANOTHER INTERESTED PARTY.
    FURTHER, SUCH INDEMNITIES AND RELEASES WILL APPLY EVEN IF INSURANCE OBTAINED
    BY NAI OR REQUIRED OF NAI BY THIS IMPROVEMENTS LEASE OR OTHER OPERATIVE
    DOCUMENTS IS NOT ADEQUATE


                                       11
<PAGE>   18
    TO COVER LOSSES AGAINST OR FOR WHICH THE INDEMNITIES AND RELEASES ARE
    PROVIDED. NAI'S LIABILITY, HOWEVER, FOR ANY FAILURE TO OBTAIN INSURANCE
    REQUIRED BY THIS IMPROVEMENTS LEASE OR OTHER OPERATIVE DOCUMENTS WILL NOT BE
    LIMITED TO LOSSES AGAINST WHICH INDEMNITIES ARE PROVIDED HEREIN, IT BEING
    UNDERSTOOD THAT SUCH INSURANCE IS INTENDED TO DO MORE THAN PROVIDE A SOURCE
    OF PAYMENT FOR LOSSES AGAINST WHICH BNPLC AND OTHER INTERESTED PARTIES ARE
    ENTITLED TO INDEMNIFICATION BY THIS IMPROVEMENTS LEASE.

    (iii) Costs and expenses for which NAI shall be responsible pursuant to this
    subparagraph 5.(c) will include appraisal fees, filing and recording fees,
    inspection fees, survey fees, taxes, brokerage fees and commissions,
    abstract fees, title policy fees, Uniform Commercial Code search fees,
    escrow fees and Attorneys' Fees incurred by BNPLC with respect to the
    Property, whether such costs and expenses are incurred at the time of
    execution of this Improvements Lease or at any time during the Term. Such
    costs and expenses will also include Attorneys' Fees or other costs incurred
    to evaluate lien releases and other information submitted by NAI with
    requests for Construction Advances.

    (iv) NAI's obligations under this subparagraph 5.(c) shall survive the
    termination or expiration of this Improvements Lease. Any amount to be paid
    by NAI under this subparagraph 5.(c) shall be due ten days after a demand
    for such payment is received by NAI.

    (v) If an Interested Party notifies NAI of any claim or proceeding included
    in, or any investigation or allegation concerning, Losses for which NAI is
    responsible pursuant to this subparagraph 5.(c), NAI shall assume on behalf
    of the Interested Party and conduct with due diligence and in good faith the
    investigation and defense thereof and the response thereto with counsel
    selected by NAI, but satisfactory to the Interested Party; provided, that
    the Interested Party shall have the right to be represented by advisory
    counsel of its own selection and at its own expense; and provided further,
    that if any such claim, proceeding, investigation or allegation involves
    both NAI and the Interested Party and the Interested Party shall have
    reasonably concluded that there are legal defenses available to it which are
    inconsistent with or in addition to those available to NAI, then the
    Interested Party shall have the right to select separate counsel to
    participate in the investigation and defense of and response to such claim,
    proceeding, investigation or allegation on its own behalf, and NAI shall pay
    or reimburse the Interested Party for all Attorney's Fees incurred by the
    Interested Party because of the selection of such separate counsel. If NAI
    fails to assume promptly (and in any event within fifteen days after being
    notified of the applicable claim, proceeding, investigation or allegation)
    the defense of the Interested Party, then the Interested Party may contest
    (or settle, with the prior consent of NAI, which consent will not be
    unreasonably withheld) the claim, proceeding, investigation or allegation at
    NAI's expense using counsel selected by the Interested Party. Moreover, if
    any such failure by NAI continues for forty-five days or more after NAI is
    notified of any such claim, proceeding, investigation or allegation, the
    Interested Party may elect not to contest or continue contesting the same
    and instead, in accordance with the written advice of counsel, settle (or
    pay in full) all claims related thereto without NAI's consent and without
    releasing NAI from any obligations to the Interested Party under this
    subparagraph 5.(c).

(d) Exceptions and Qualifications to Indemnities.

    (i) BNPLC acknowledges and agrees that nothing in subparagraph 4.(a) or the
    preceding subparagraphs of this Paragraph 5 shall be construed to require
    NAI to pay or reimburse an Interested Party for (w) any costs or expenses
    incurred by BNPLC or any transferee to accomplish any Permitted Transfers
    described in clauses (2), (3), (4), (6) or (7) of the definition thereof in
    the Common Definitions and Provisions Agreement (Phase II - Improvements),
    (x) Excluded Taxes, (y) Losses incurred or suffered by such Interested Party
    that are proximately caused by (and attributed by any applicable principles
    of comparative fault to) the Established Misconduct of that Interested
    Party, or (z) Losses incurred or suffered by Participants in connection with
    their negotiation or execution of the Participation Agreement or Pledge
    Agreement (or supplements making them parties thereto) or in connection with
    any due diligence they may undertake before entering into the Participation
    Agreement or Pledge Agreement. Further, without limiting BNPLC's rights (as
    provided in other


                                       12
<PAGE>   19


    provisions of this Improvements Lease and other Operative Documents) to
    include the following in the calculation of the Outstanding Construction
    Allowance, Stipulated Loss Value, the Break Even Price and the Maximum
    Permitted Prepayment (as applicable) or to collect Base Rent, Issue 97-10
    Prepayments, a Supplemental Payment and other amounts, the calculation of
    which depends upon the Outstanding Construction Allowance, Stipulated Loss
    Value, the Break Even Price and the Maximum Permitted Prepayment, BNPLC
    acknowledges and agrees that nothing in subparagraph 4.(a) or the preceding
    subparagraphs of this Paragraph 5 shall be construed to require NAI to pay
    or reimburse an Interested Party for:

        a)  costs paid by BNPLC with the proceeds of the Initial Funding Advance
        as part of the Transaction Expenses; or

        b) Construction Advances, including costs and expenditures incurred or
        paid by or on behalf of BNPLC after any Landlord's Election to Continue
        Construction, to the extent that such costs and expenditures are
        considered to be Construction Advances pursuant to subparagraph 6.(e).

    Further, if an Interested Party receives a written notice of Losses that
    such Interested Party believes are covered by the indemnity in subparagraph
    5.(c)(i), then such Interested Party will be expected to promptly furnish a
    copy of such notice to NAI. The failure to so provide a copy of the notice
    to NAI shall not excuse NAI from its obligations under subparagraph
    5.(c)(i); provided, that if NAI is unaware of the matters described in the
    notice and such failure renders unavailable defenses that NAI might
    otherwise assert, or precludes actions that NAI might otherwise take, to
    minimize its obligations, then NAI shall be excused from its obligation to
    indemnify such Interested Party (and any Affiliate of such Interested Party)
    against the Losses, if any, which would not have been incurred or suffered
    but for such failure. For example, if BNPLC fails to provide NAI with a copy
    of a notice of an obligation covered by the indemnity set out in
    subparagraph 5.(c)(i) and NAI is not otherwise already aware of such
    obligation, and if as a result of such failure BNPLC becomes liable for
    penalties and interest covered by the indemnity in excess of the penalties
    and interest that would have accrued if NAI had been promptly provided with
    a copy of the notice, then NAI will be excused from any obligation to BNPLC
    (or any Affiliate of BNPLC) to pay the excess.

    (ii) Notwithstanding anything to the contrary in subparagraph 4.(a) or the
    preceding subparagraphs of this Paragraph 5, NAI's liability for payments
    required by the preceding subparagraphs of this Paragraph 5, and not excused
    by the preceding subparagraph 5.(d)(i), prior to substantial completion of
    the Construction Project ("CONSTRUCTION-PERIOD INDEMNITY PAYMENTS") shall be
    subject to the following provisions:

           a) NAI may decline to pay any Construction-Period Indemnity Payments
           other than the following (it being understood that NAI's payment of
           the following Construction-Period Indemnity Payments shall not be
           subject to any abatement or deferral by anything contained in this
           subparagraph 5.(d)(ii):

                  (1) Construction-Period Indemnity Payments eligible for
                  reimbursement to NAI under the terms and conditions of the
                  Construction Management Agreement; and

                  (2) Construction-Period Indemnity Payments that constitute
                  Absolute NAI Construction Obligations.

           b) Any Construction-Period Indemnity Payment NAI is excused from
           paying by this subparagraph , together with interest thereon at the
           Default Rate, will be included in the calculation of the Break Even
           Price under (and as defined in) the Purchase Agreement.



                                       13
<PAGE>   20

6. CONSTRUCTION.

(a) Construction Advances; Outstanding Construction Allowance.  The Construction
Management Agreement entitles NAI to receive from BNPLC - subject to the terms
and conditions set forth in the Construction Management Agreement - Construction
Advances on Advance Dates from time to time to pay or reimburse NAI for the
costs of the Construction Project and certain other costs described in the
Construction Management Agreement. In addition, BNPLC may from time to time make
expenditures or incur costs constituting Construction Advances after a
Landlord's Election to Continue Construction as described in subparagraph 6.(e).
As used herein, references to the "OUTSTANDING CONSTRUCTION ALLOWANCE" mean the
difference on the date in question (but not less than zero) of (A) the total
Construction Advances made by or on behalf of BNPLC on or prior to the date in
question, plus (B) all Carrying Costs added on or prior to the date in question,
less (C) any funds received and applied as Qualified Prepayments on or prior to
the date in question. Charges ("CARRYING COSTS") shall accrue as described below
for each Construction Period and will be added to (and thereafter be included
in) the Outstanding Construction Allowance on the last day of such Construction
Period (i.e., generally on the Advance Date upon which such Construction Period
ends). However, if for any reason Stipulated Loss Value (and thus the
Outstanding Construction Allowance included as a component thereof) must be
determined as of any date between Advance Dates, the Outstanding Construction
Allowance determined on such date shall include not only Carrying Costs added on
or before the immediately preceding Advance Date computed as described below,
but also Carrying Costs accruing on and after such preceding Advance Date to but
not including the date in question.

(b) Calculation of Carrying Costs. Carrying Costs accruing for any Construction
Period shall equal:

        -   the sum on the first day of such Construction Period of (i)
            Stipulated Loss Value under (and as defined in) the Common
            Definitions and Provisions Agreement (Phase II - Improvements) and
            (ii) Stipulated Loss Value under (and as defined in) the Other
            Common Definitions and Provisions Agreement, times

        -   the sum of (a) the Effective Rate with respect to such Construction
            Period, plus (b) the Unsecured Spread for such Construction Period,
            times

        -   the number of days in the period from and including the preceding
            Advance Date to but not including the Advance Date upon which the
            period ends, divided by

        -   three hundred sixty.

        Assume, only for the purpose of illustration: that the Collateral
    Percentage for a hypothetical Construction Period is zero percent (0%); that
    on the first day of such Construction Period Combined Stipulated Loss Value
    is $15,000,000; that the Effective Rate for the Construction Period is 6%;
    that the Unsecured Spread for such Construction Period is one hundred fifty
    basis points (150/100 of 1%); and that such Construction Period contains
    exactly thirty days. Under such assumptions, the Carrying Costs for the
    hypothetical Construction Period will equal:

                  $15,000,000 x (6% + 1.50%) x 30/360 = $93,750

(c) Limits on the Amount of Carrying Costs.  Notwithstanding the foregoing,
because the Construction Allowance available to NAI under the Construction
Management Agreement is limited in amount to the Maximum Construction Allowance,
and because Carrying Costs are to be charged against the Construction Allowance,
Carrying Costs added to the Outstanding Construction Allowance on the Base Rent
Commencement Date shall not exceed the amount that can be added without causing
the Funded Construction Allowance to exceed the Maximum Construction Allowance.
If, because of an extension of the Base Rent Commencement Date by BNPLC (as
described in the definition thereof in the Common Definitions and Provisions
Agreement (Phase II - Improvements)) or because of any Landlord's Election to
Continue Construction, the



                                       14
<PAGE>   21

Funded Construction Allowance already exceeds the Maximum Construction
Allowance, then no Carrying Costs will be added to the Outstanding Construction
Allowance on the Base Rent Commencement Date.

(d) NAI's Right to Control the Construction Project.  Subject to BNPLC's rights
under subparagraph 6.(e) of this Improvements Lease, the Construction Management
Agreement grants to NAI the sole right and responsibility for designing and
constructing the Construction Project, it being understood that although title
to all Improvements will pass directly to BNPLC (as more particularly provided
in Paragraph 7), BNPLC's obligation with respect to the Construction Project
shall be limited to the making of advances under and subject to the conditions
set forth in the Construction Management Agreement. No contractor or other third
party shall be entitled to require BNPLC to make advances as a third party
beneficiary of this Improvements Lease or of the Construction Management
Agreement or otherwise.

(e) Landlord's Election to Continue Construction.  Without limiting BNPLC's
other rights and remedies under this Improvements Lease, and without terminating
this Improvements Lease or NAI's obligations hereunder or under any of the other
documents referenced herein, in the event of any termination of the Construction
Management Agreement as provided in subparagraph 5(D) or subparagraph 5(E)
thereof, BNPLC shall be entitled (but not obligated) to take whatever action it
deems necessary or appropriate by the use of legal proceedings or otherwise to
continue or complete the Construction Project in a manner substantially
consistent (to the extent practicable under Applicable Laws) with the general
description of the Construction Project set forth in Exhibit B to the
Construction Management Agreement and with the permitted use of the Property set
forth in subparagraph 2.(a).  (As used herein, "LANDLORD'S ELECTION TO CONTINUE
CONSTRUCTION" means any election by BNPLC to continue or complete the
Construction Project pursuant to the preceding sentence.) After any Landlord's
Election to Continue Construction, BNPLC may do any one or more of the following
pursuant to this subparagraph without further notice and regardless of whether
any Event of Default is then continuing:

    (i) Take Control of the Property.  BNPLC may cause NAI and any contractors
    or other parties on the Property to vacate the Property until the
    Construction Project is complete or BNPLC elects not to continue work on the
    Construction Project.

    (ii) Continuation of Construction.  BNPLC may perform or cause to be
    performed any work to complete or continue the construction of the
    Construction Project. In this regard, so long as work ordered or undertaken
    by BNPLC is substantially consistent (to the extent practicable under
    Applicable Laws) with the general description of the Construction Project
    set forth in Exhibit B to the Construction Management Agreement and the
    permitted use of the Property set forth in subparagraph 2.(a), BNPLC shall
    have complete discretion to:

           a) proceed with construction according to such plans and
           specifications as BNPLC may from time to time approve;

           b) establish and extend construction deadlines as BNPLC from time to
           time deems appropriate, without obligation to adhere to the deadlines
           for Construction Milestones set forth in the Construction Management
           Agreement;

           c) hire, fire and replace architects, engineers, contractors,
           construction managers and other consultants as BNPLC from time to
           time deems appropriate, without obligation to use, consider or
           compensate architects, engineers, contractors, construction managers
           or other consultants previously selected or engaged by NAI;

           d) determine the compensation that any architect, engineer,
           contractor, construction manager or other consultant engaged by BNPLC
           will be paid, and the terms and conditions that will govern the
           payment of such compensation (including whether payment will be due
           in advance, over the course of construction or on some other basis
           and including whether contracts will be let on a fixed price basis, a
           cost plus a fee basis or some other basis), as BNPLC from time to
           time deems appropriate;




                                       15
<PAGE>   22


           e) pay, settle or compromise existing or future bills and claims
           which are or may be liens against the Property or as BNPLC considers
           necessary or desirable for the completion of the Construction Project
           or the removal of any clouds on title to the Property;

           f) prosecute and defend all actions or proceedings in connection with
           the construction of the Construction Project;

           g) select and change interior and exterior finishes for the
           Improvements and landscaping as BNPLC from time to time deems
           appropriate; and

           h) generally do anything that NAI itself might have done if NAI had
           satisfied or obtained BNPLC's waiver of the conditions specified
           therein.

    (iii) Arrange for Turnkey Construction.  Without limiting the generality of
    the foregoing, BNPLC may engage any contractor or real estate developer
    BNPLC believes to be reputable to take over and complete construction of the
    Construction Project on a "turnkey" basis.

    (iv) Suspension or Termination of Construction.  Notwithstanding any
    Landlord's Election to Continue Construction, BNPLC may subsequently elect
    at any time to suspend or terminate further construction without obligation
    to NAI.

For purposes of this Improvements Lease and other Operative Documents (including
the determination of the Outstanding Construction Allowance, Stipulated Loss
Value, the Break Even Price and the Maximum Permitted Prepayment), after any
Landlord's Election to Continue Construction, all costs and expenditures
incurred or paid by or on behalf of BNPLC to complete or continue construction
as provided in this subparagraph shall be considered Construction Advances and
Project Costs, regardless of whether they cause the Funded Construction
Allowance to exceed the Maximum Construction Allowance. Further, as used in the
preceding sentence, "costs incurred" by BNPLC will include costs that BNPLC has
become obligated to pay to any third party that is not an Affiliate of BNPLC
(including any contractor), even if the payments for which BNPLC has become so
obligated will constitute prepayments for work or services to be rendered after
payment and notwithstanding that BNPLC's obligations for the payments may be
conditioned upon matters beyond BNPLC's control. For example, even if a
construction contract between BNPLC and a contractor excused BNPLC from making
further progress payments to the contractor upon NAI's failure to make any
required Issue 97-10 Prepayment hereunder, the obligation to make a progress
payment would nonetheless be "incurred" by BNPLC, for purposes of determining
whether BNPLC has incurred costs considered to be Project Costs and Construction
Advances, when BNPLC's obligation to pay it became subject only to NAI's payment
of an Issue 97-10 Prepayment or other conditions beyond BNPLC's control. If and
to the extent, however, BNPLC does incur costs considered as Construction
Advances under this subparagraph, but (1) BNPLC does not actually pay the costs
and after incurring them BNPLC is fully and finally excused from the obligation
to pay them for any reason other than a breach by NAI of this Improvements Lease
or other Operative Documents, or (2) BNPLC receives a refund of such costs, then
the costs BNPLC is excused from paying or refunded to BNPLC shall be considered
Qualified Prepayments.

(f) Powers Coupled With an Interest.  BNPLC's rights under subparagraph 6.(e)
are intended to constitute powers coupled with an interest which cannot be
revoked.

(g) Completion Notice.  After any Landlord's Election to Continue Construction,
BNPLC may provide a notice (a "COMPLETION NOTICE") to NAI, advising NAI that
construction of the Construction Project is substantially complete or that BNPLC
no longer intends to continue such construction at that time.



                                       16
<PAGE>   23


7. STATUS OF PROPERTY ACQUIRED WITH FUNDS PROVIDED BY BNPLC. All Improvements
constructed during the term of this Improvements Lease shall be owned by BNPLC
and shall constitute "Property" covered by this Improvements Lease. Further, to
the extent heretofore or hereafter acquired (in whole or in part) with any
portion of the Initial Funding Advance or with any Construction Advances or with
other funds for which NAI has received or hereafter receives reimbursement from
the Initial Funding Advance or Construction Advances, all furnishings,
furniture, chattels, permits, licenses, franchises, certificates and other
personal property of whatever nature shall have been acquired on behalf of BNPLC
by NAI, shall be owned by BNPLC and shall constitute "Property" covered by this
Improvements Lease, as shall all renewals or replacements of or substitutions
for any such Property. NAI shall not authorize or permit the transfer of title
to the Improvements or to any other such Property to pass through NAI or NAI's
Affiliates before it is transferred to BNPLC from contractors, suppliers,
vendors or other third Persons. Nothing herein shall constitute authorization of
NAI by BNPLC to bind BNPLC to any construction contract or other agreement with
a third Person, but any construction contract or other agreement executed by NAI
for the acquisition or construction of Improvements or other components of the
Property may provide for the transfer of title as required by the preceding
sentence. Upon request of BNPLC, but not more often than once in any period of
twelve consecutive months, NAI shall deliver to BNPLC an inventory describing
all significant items of Personal Property (and, in the case of tangible
personal property, showing the make, model, serial number and location thereof)
other than Improvements, with a certification by NAI that such inventory is true
and complete and that all items specified in the inventory are covered by this
Improvements Lease free and clear of any Lien other than the Permitted
Encumbrances or Liens Removable by BNPLC.

8. ENVIRONMENTAL.

(a) Environmental Covenants by NAI. NAI covenants that:

    (i) NAI shall not conduct or permit others to conduct Hazardous Substance
    Activities, except Permitted Hazardous Substance Use and Remedial Work.

    (ii) NAI shall not discharge or permit the discharge of anything on or from
    the Property that would require any permit under applicable Environmental
    Laws, other than (1) storm water runoff, (2) waste water discharges through
    a publicly owned treatment works, (3) discharges that are a necessary part
    of any Remedial Work, and (4) other similar discharges consistent with the
    definition herein of Permitted Hazardous Substance Use, in each case in
    strict compliance with Environmental Laws.

    (iii) Following any discovery that Remedial Work is required by
    Environmental Laws or otherwise believed by BNPLC to be reasonably required,
    and to the extent not inconsistent with the other provisions of this
    Improvements Lease, NAI shall promptly perform and diligently and
    continuously pursue such Remedial Work, in each case in strict compliance
    with Environmental Laws.

    (iv) If requested by BNPLC in connection with any Remedial Work required by
    this subparagraph, NAI shall retain independent environmental consultants
    acceptable to BNPLC to evaluate any significant new information generated
    during NAI's implementation of the Remedial Work and to discuss with NAI
    whether such new information indicates the need for any additional measures
    that NAI should take to protect the health and safety of persons (including
    employees, contractors and subcontractors and their employees) or to protect
    the environment. NAI shall implement any such additional measures to the
    extent required with respect to the Property by Environmental Laws or
    otherwise believed by BNPLC to be reasonably required and to the extent not
    inconsistent with the other provisions of this Improvements Lease.

(b) Right of BNPLC to do Remedial Work Not Performed by NAI.  If NAI's failure
to cure any breach of the covenants set forth in subparagraph 8.(a) continues
beyond the Environmental Cure Period (as defined below), BNPLC may, in


                                       17
<PAGE>   24


addition to any other remedies available to it, conduct all or any part of the
Remedial Work. To the extent that Remedial Work is done by BNPLC pursuant to the
preceding sentence (including any removal of Hazardous Substances), the cost
thereof shall be a demand obligation owing by NAI to BNPLC. As used in this
subparagraph, "ENVIRONMENTAL CURE PERIOD" means the period ending on the earlier
of: (1) one hundred eighty days after NAI is notified of the breach which must
be cured within such period, (2) the date that any writ or order is issued for
the levy or sale of any property owned by BNPLC (including the Property) because
of such breach, (3) the date that any criminal action is instituted or overtly
threatened against BNPLC or any of its directors, officers or employees because
of such breach, or (4) any Designated Sale Date upon which, for any reason, NAI
or an Affiliate of NAI or any Applicable Purchaser shall not purchase BNPLC's
interest in the Property pursuant to the Purchase Agreement for a net price to
BNPLC (when taken together with any Supplemental Payment made by NAI pursuant to
Paragraph 1(A)(2) of the Purchase Agreement, in the case of a purchase by an
Applicable Purchaser) equal to Stipulated Loss Value.

(c) Environmental Inspections and Reviews.  BNPLC reserves the right to retain
environmental consultants to review any report prepared by NAI or to conduct
BNPLC's own investigation to confirm whether NAI is complying with the
requirements of this Paragraph 8.  NAI grants to BNPLC and to BNPLC's agents,
employees, consultants and contractors the right to enter upon the Property at
any time to inspect the Property and to perform such tests as BNPLC deems
necessary or appropriate to review or investigate Hazardous Substances in, on,
under or about the Property or any discharge or suspected discharge of Hazardous
Substances into groundwater or surface water from the Property. NAI shall
promptly reimburse BNPLC for the fees of its environmental consultants and the
costs of any such inspections and tests.

(d) Communications Regarding Environmental Matters.

    (i) NAI shall immediately advise BNPLC of (1) any discovery of any event or
    circumstance which would render any of the representations of NAI herein or
    in the Closing Certificate concerning environmental matters materially
    inaccurate or misleading if made at the time of such discovery and assuming
    that NAI was aware of all relevant facts, (2) any Remedial Work (or change
    in Remedial Work) required or undertaken by NAI or its Affiliates in
    response to any (A) discovery of any Hazardous Substances on, under or about
    the Property other than Permitted Hazardous Substances or (B) any claim for
    damages resulting from Hazardous Substance Activities, (3) NAI's discovery
    of any occurrence or condition on any real property adjoining or in the
    vicinity of the Property which could cause the Property or any part thereof
    to be subject to any ownership, occupancy, transferability or use
    restrictions under Environmental Laws, or (4) any investigation or inquiry
    of any failure or alleged failure by NAI to comply with Environmental Laws
    affecting the Property by any governmental authority responsible for
    enforcing Environmental Laws. In such event, NAI shall deliver to BNPLC
    within thirty days after BNPLC's request, a preliminary written
    environmental plan setting forth a general description of the action that
    NAI proposes to take with respect thereto, if any, to bring the Property
    into compliance with Environmental Laws or to correct any breach by NAI of
    this Paragraph 8, including any proposed Remedial Work, the estimated cost
    and time of completion, the name of the contractor and a copy of the
    construction contract, if any, and such additional data, instruments,
    documents, agreements or other materials or information as BNPLC may
    request.

    (ii) NAI shall provide BNPLC with copies of all material written
    communications with federal, state and local governments, or agencies
    relating to the matters listed in the preceding clause (i). NAI shall also
    provide BNPLC with copies of any correspondence from third Persons which
    threaten litigation over any significant failure or alleged significant
    failure of NAI to maintain or operate the Property in accordance with
    Environmental Laws.

    (iii) Prior to NAI's submission of a Material Environmental Communication to
    any governmental or regulatory agency or third party, NAI shall, to the
    extent practicable, deliver to BNPLC a draft of the proposed submission
    (together with the proposed date of submission), and in good faith assess
    and consider any comments of BNPLC regarding the same. Promptly after
    BNPLC's request, NAI shall meet with BNPLC to discuss the submission, shall
    provide any additional information requested by BNPLC and shall provide a
    written explanation to BNPLC addressing the issues


                                       18
<PAGE>   25


    raised by comments (if any) of BNPLC regarding the submission, including a
    reasoned analysis supporting any decision by NAI not to modify the
    submission in accordance with comments of BNPLC.

    9. INSURANCE REQUIRED AND CONDEMNATION.

(a) Liability Insurance.  Throughout the Term NAI shall maintain commercial
general liability insurance against claims for bodily and personal injury, death
and property damage occurring in or upon or resulting from any occurrence in or
upon the Property under one or more insurance policies that satisfy the
requirements set forth in Exhibit B.  NAI shall deliver and maintain with BNPLC
for each liability insurance policy required by this Improvements Lease written
confirmation of the policy and the scope of the coverage provided thereby issued
by the applicable insurer or its authorized agent, which confirmation must also
satisfy the requirements set forth in Exhibit B.

(b) Property Insurance.  Throughout the Term NAI will keep all Improvements
(including all alterations, additions and changes made to the Improvements)
insured against fire and other casualty under one or more property insurance
policies that satisfy the requirements set forth in Exhibit B.  NAI shall
deliver and maintain with BNPLC for each property insurance policy required by
this Improvements Lease written confirmation of the policy and the scope of the
coverage provided thereby issued by the applicable insurer or its authorized
agent, which confirmation must also satisfy the requirements set forth in
Exhibit B. If any of the Property is destroyed or damaged by fire, explosion,
windstorm, hail or by any other casualty against which insurance shall have been
required hereunder, (i) BNPLC may, but shall not be obligated to, make proof of
loss if not made promptly by NAI after notice from BNPLC, (ii) each insurance
company concerned is hereby authorized and directed to make payment for such
loss directly to BNPLC for application as required by Paragraph , and (iii)
BNPLC may settle, adjust or compromise any and all claims for loss, damage or
destruction under any policy or policies of insurance (provided, that if any
such claim is for less than $500,000, if no CMA Termination Event shall have
occurred and no Event of Default shall have occurred and be continuing, NAI
shall have the right to settle, adjust or compromise the claim as NAI deems
appropriate; and, provided further, that so long as no CMA Termination Event
shall have occurred and no Event of Default shall have occurred and be
continuing, BNPLC must provide NAI with at least forty-five days notice of
BNPLC's intention to settle any such claim before settling it unless NAI shall
already have approved of the settlement by BNPLC). If any casualty shall result
in damage to or loss or destruction of the Property, NAI shall give immediate
notice thereof to BNPLC and Paragraph 10 shall apply.

(c) Failure to Obtain Insurance.  If NAI fails to obtain any insurance or to
provide confirmation of any such insurance as required by this Improvements
Lease, BNPLC shall be entitled (but not required) to obtain the insurance that
NAI has failed to obtain or for which NAI has not provided the required
confirmation and, without limiting BNPLC's other remedies under the
circumstances, BNPLC may require NAI to reimburse BNPLC for the cost of such
insurance and to pay interest thereon computed at the Default Rate from the date
such cost was paid by BNPLC until the date of reimbursement by NAI (provided,
however, that any such insurance cost paid by BNPLC prior to the Base Rent
Commencement Date will be charged against the Construction Allowance under the
Construction Management Agreement as if it had been paid by NAI).

(d) Condemnation.  Immediately upon obtaining knowledge of the institution of
any proceedings for the condemnation of the Property or any portion thereof, or
any other similar governmental or quasi-governmental proceedings arising out of
injury or damage to the Property or any portion thereof, each party shall notify
the other (provided, however, BNPLC shall have no liability for its failure to
provide such notice) of the pendency of such proceedings. NAI shall, at its
expense, diligently prosecute any such proceedings and shall consult with BNPLC,
its attorneys and experts and cooperate with them as requested in the carrying
on or defense of any such proceedings. All proceeds of condemnation awards or
proceeds of sale in lieu of condemnation with respect to the Property and all
judgments, decrees and awards for injury or damage to the Property shall be paid
to BNPLC as Escrowed Proceeds, and all such proceeds will be applied as provided
in Paragraph 10. BNPLC is hereby authorized, in the name of NAI, at any time
after a CMA Termination Event or when an Event of Default shall have occurred
and be continuing, or otherwise with NAI's prior consent, to execute and deliver
valid acquittances

                                       19
<PAGE>   26

for, and to appeal from, any such judgment, decree or award concerning
condemnation of any of the Property. BNPLC shall not be in any event or
circumstances liable or responsible for failure to collect, or to exercise
diligence in the collection of, any such proceeds, judgments, decrees or awards.

(e) Waiver of Subrogation. NAI, for itself and for any Person claiming through
it (including any insurance company claiming by way of subrogation), waives any
and every claim which arises or may arise in its favor against BNPLC or any
other Interested Party and the officers, directors, and employees of the
Interested Parties for any and all Losses, to the extent that NAI is compensated
by insurance or would be compensated by the insurance policies contemplated in
this Improvements Lease, but for any deductible or self-insured retention
maintained under such insurance or but for a failure of NAI to maintain the
insurance as required by this Improvements Lease. NAI agrees to have such
insurance policies properly endorsed so as to make them valid notwithstanding
this waiver, if such endorsement is required to prevent a loss of insurance.


10. APPLICATION OF INSURANCE AND CONDEMNATION PROCEEDS.

(a) Collection and Application of Insurance and Condemnation Proceeds Generally.
This Paragraph 10 shall govern the application of proceeds received by BNPLC or
NAI during the Term from any third party (1) under any property insurance policy
as a result of damage to the Property (including proceeds payable under any
insurance policy covering the Property which is maintained by NAI), (2) as
compensation for any restriction placed upon the use or development of the
Property or for the condemnation of the Property or any portion thereof, or (3)
because of any judgment, decree or award for injury or damage to the Property;
excluding, however, any funds paid to BNPLC by BNPLC's Parent, by an Affiliate
of BNPLC or by any Participant that is made to compensate BNPLC for any Losses
BNPLC may suffer or incur in connection with this Improvements Lease or the
Property. NAI will promptly pay over to BNPLC any insurance, condemnation or
other proceeds covered by this Paragraph 10 which NAI may receive from any
insurer, condemning authority or other third party. All proceeds covered by this
Paragraph 10, including those received by BNPLC from NAI or third parties, shall
be applied as follows:

    (i) First, proceeds covered by this Paragraph 10 will be used to reimburse
    BNPLC for any costs and expenses, including Attorneys' Fees, that BNPLC
    incurred to collect the proceeds.

    (ii) Second, the proceeds remaining after such reimbursement to BNPLC
    (hereinafter, the "REMAINING PROCEEDS") will be applied, as hereinafter more
    particularly provided, either as a Qualified Prepayment or to reimburse NAI
    or BNPLC for the actual out-of-pocket costs of repairing or restoring the
    Property. Until, however, any Remaining Proceeds received by BNPLC are
    applied by BNPLC as a Qualified Prepayment or applied by BNPLC to reimburse
    costs of repairs to or restoration of the Property pursuant to this
    Paragraph , BNPLC shall hold and maintain such Remaining Proceeds as
    Escrowed Proceeds in an interest bearing account, and all interest earned on
    such account shall be added to and made a part of such Escrowed Proceeds.

(b) Advances of Escrowed Proceeds to NAI.  Except as otherwise provided below in
this Paragraph 10, BNPLC shall advance all Remaining Proceeds held by it as
Escrowed Proceeds to reimburse NAI for the actual out-of-pocket cost to NAI of
repairing or restoring the Property in accordance with the requirements of this
Improvements Lease and the other Operative Documents as the applicable repair or
restoration progresses and upon compliance by NAI with such terms, conditions
and requirements as may be reasonably imposed by BNPLC. In no event, however,
shall BNPLC be required to pay Escrowed Proceeds to NAI in excess of the actual
out-of-pocket cost to NAI of the applicable repair or restoration, as evidenced
by invoices or other documentation satisfactory to BNPLC, it being understood
that BNPLC may retain and apply any such excess as a Qualified Prepayment.

(c) Application of Escrowed Proceeds as a Qualified Prepayment.  Provided NAI
has completed the Construction Project pursuant to the Construction Management
Agreement and no Event of Default shall have occurred and be continuing, BNPLC
shall apply any Remaining Proceeds paid to it (or other amounts available for
application as a Qualified

                                       20
<PAGE>   27


Prepayment) as a Qualified Prepayment on any date that BNPLC is directed to do
so by a notice from NAI; however, if such a notice from NAI specifies an
effective date for a Qualified Prepayment that is less than five Business Days
after BNPLC's actual receipt of the notice, BNPLC may postpone the date of the
Qualified Prepayment to any date not later than five Business Days after BNPLC's
receipt of the notice. In any event, except when BNPLC is required by the
preceding sentence to apply Remaining Proceeds or other amounts as a Qualified
Prepayment on an Advance Date or Base Rent Date, BNPLC may deduct Breakage Costs
incurred in connection with any Qualified Prepayment from the Remaining Proceeds
or other amounts available for application as the Qualified Prepayment, and NAI
will reimburse BNPLC upon request for any such Breakage Costs that BNPLC incurs
but does not deduct.

(d) Special Provisions Applicable After a CMA Termination Event or Event of
Default.  Notwithstanding the foregoing, after any CMA Termination Event, and
when any Event of Default shall have occurred and be continuing, BNPLC shall be
entitled to receive and collect all insurance, condemnation or other proceeds
governed by this Paragraph 10 and to apply all Remaining Proceeds, when and to
the extent deemed appropriate by BNPLC in its sole discretion, either (A) to the
reimbursement of NAI or BNPLC for the out-of-pocket cost of repairing or
restoring the Property, or (B) as Qualified Prepayments.

(e) NAI's Obligation to Restore.  Regardless of the adequacy of any Remaining
Proceeds available to NAI hereunder, and notwithstanding other provisions of
this Improvements Lease to the contrary:

    (1) If, prior to the Base Rent Commencement Date, the Property is damaged by
    fire or other casualty or any part of the Property is taken by condemnation,
    NAI shall to the maximum extent possible, as part of the Work contemplated
    in the Construction Management Agreement, restore the Property or the
    remainder thereof and continue construction of the Construction Project on
    and subject to the terms and conditions set forth in the Construction
    Management Agreement. However, any additional costs required to complete the
    Construction Project resulting from such a casualty or taking prior to the
    Base Rent Commencement Date shall, to the extent not covered by Remaining
    Proceeds paid to NAI as provided in this Improvements Lease, be subject to
    reimbursement by BNPLC under the Construction Management Agreement on the
    same terms and conditions that apply to reimbursements of other costs of the
    Work thereunder.

    (2) If, on or after the Base Rent Commencement Date, the Property is
    damaged by fire or other casualty or less than all or substantially all of
    the Property is taken by condemnation, NAI must:

                A) increase the value of the Property or the remainder thereof
            by restoring or improving the same (in a manner consistent with the
            requirements and limitations imposed by this Improvements Lease and
            the other Operative Documents or otherwise acceptable to BNPLC), or
            decrease Stipulated Loss Value by tendering a payment to BNPLC for
            application as a Qualified Prepayment, as necessary to cause Current
            AS IS Market Value to be not less than sixty percent (60%) of
            Stipulated Loss Value; and

                B) restore the Property or the remainder thereof to a reasonably
            safe and sightly condition.

(f) Takings of All or Substantially All of the Property on or after the Base
Rent Commencement Date.  In the event of any taking of all or substantially all
of the Property on or after the Base Rent Commencement Date, BNPLC shall be
entitled to apply all Remaining Proceeds as a Qualified Prepayment. In addition,
if Stipulated Loss Value immediately prior to any such taking exceeds the sum of
the Remaining Proceeds resulting from such condemnation, then BNPLC shall be
entitled to recover the excess from NAI upon demand as an additional Qualified
Prepayment, whereupon this Improvements Lease shall terminate. Any taking of so
much of the Real Property as, in BNPLC's reasonable good faith judgment, makes
it impracticable to restore or improve the remainder thereof as required by part
(2) of the preceding subparagraph shall be considered a taking of substantially
all the Property for purposes of this Paragraph 10.

                                       21
<PAGE>   28


11. ADDITIONAL REPRESENTATIONS, WARRANTIES AND COVENANTS OF NAI CONCERNING THE
PROPERTY. NAI represents, warrants and covenants as follows:

(a) Compliance with Covenants and Laws.  The use of the Property permitted by
this Improvements Lease complies, or will comply after NAI obtains available
permits as the tenant under this Improvements Lease, in all material respects
with all Applicable Laws. NAI has obtained or will promptly obtain all utility,
building, health and operating permits as may be required by any governmental
authority or municipality having jurisdiction over the Property for the
construction contemplated herein and the use of the Property permitted by this
Improvements Lease.

(b) Operation of the Property.  During the Term, NAI shall operate the Property
in a good and workmanlike manner and substantially in compliance with all
Applicable Laws and will pay or cause to be paid all fees or charges of any kind
in connection therewith. (If NAI does not promptly correct any failure of the
Property to comply with Applicable Laws that is the subject of a written notice
given to NAI or BNPLC by any governmental authority, then for purposes of the
preceding sentence, NAI shall be considered not to have maintained the Property
"substantially in accordance with Applicable Laws" whether or not the
noncompliance would be substantial in the absence of the notice.) During the
Term, NAI shall not use or occupy, or allow the use or occupancy of, the
Property in any manner which violates any Applicable Law or which constitutes a
public or private nuisance or which makes void, voidable or cancelable any
insurance then in force with respect thereto. During the Term, to the extent
that any of the following would, individually or in the aggregate, increase the
likelihood of a CMA Termination Event under the Construction Management
Agreement or materially and adversely affect the value of the Property or NAI's
use, occupancy or operations on the Property, NAI shall not, without BNPLC's
prior consent: (i) initiate or permit any zoning reclassification of the
Property; (ii) seek any variance under existing zoning ordinances applicable to
the Property; (iii) use or permit the use of the Property in a manner that would
result in such use becoming a nonconforming use under applicable zoning
ordinances or similar laws, rules or regulations; (iv) execute or file any
subdivision plat affecting the Property; or (v) consent to the annexation of the
Property to any municipality. If (A) a change in the zoning or other Applicable
Laws affecting the permitted use or development of the Property shall occur
after the Base Rent Commencement Date that reduces the value of the Property, or
(B) conditions or circumstances on or about the Property are discovered after
the Base Rent Commencement Date (such as the presence of an endangered species)
which substantially impede development and thereby reduce the value of the
Property, and if after any such reduction under clause (A) or (B) preceding the
Current AS IS Market Value of the Property is less than sixty percent (60%) of
Stipulated Loss Value, then NAI shall pay BNPLC upon request the amount by which
Current AS IS Market Value is less than sixty percent (60%) of Stipulated Loss
Value, for application as a Qualified Prepayment. During the Term, NAI shall not
cause or permit any drilling or exploration for, or extraction, removal or
production of, minerals from the surface or subsurface of the Property, and NAI
shall not do any act whereby the market value of the Property may reasonably be
expected to be materially lessened. During the Term, if NAI receives a written
notice or claim from any federal, state or other governmental entity that the
Property is not in compliance in any material respect with any Applicable Law,
or that any action may be taken against the owner of the Property because the
Property does not comply with Applicable Law, NAI shall promptly furnish a copy
of such notice or claim to BNPLC.

Notwithstanding the foregoing, NAI may in good faith, by appropriate
proceedings, contest the validity and applicability of any Applicable Law with
respect to the Property, and pending such contest NAI shall not be deemed in
default hereunder because of the violation of such Applicable Law, if NAI
diligently prosecutes such contest to completion in a manner reasonably
satisfactory to BNPLC, and if NAI promptly causes the Property to comply with
any such Applicable Law upon a final determination by a court of competent
jurisdiction that the same is valid and applicable to the Property; provided,
however, in any event such contest shall be concluded and the violation of such
Applicable Law must be corrected by NAI and any claims asserted against BNPLC or
the Property because of such violation must be paid by NAI, all prior to the
earlier of (i) the date that any criminal prosecution is instituted or overtly
threatened against BNPLC or any of its directors, officers or employees because
of such violation, (ii) the date that any action is taken by any governmental
authority against BNPLC or any property owned by BNPLC (including the Property)
because of such violation, or (iii) a Designated Sale Date upon which,


                                       22
<PAGE>   29


for any reason, NAI or an Affiliate of NAI or any Applicable Purchaser shall not
purchase BNPLC's interest in the Property pursuant to the Purchase Agreement for
a price to BNPLC (when taken together with any additional payments made by NAI
pursuant to Paragraph 1(A)(2) of the Purchase Agreement, in the case of a
purchase by an Applicable Purchaser) equal to the Break Even Price.

(c) Debts for Construction, Maintenance, Operation or Development.  NAI shall
cause all debts and liabilities incurred in the construction, maintenance,
operation or development of the Property, including all debts and liabilities
for labor, material and equipment and all debts and charges for utilities
servicing the Property, to be promptly paid; provided, that nothing in this
subparagraph will be construed to require NAI to remove Liens Removable by
BNPLC.

Notwithstanding the foregoing, NAI may in good faith, by appropriate
proceedings, contest the validity, applicability or amount of any asserted
mechanic's or materialmen's lien and pending such contest NAI shall not be
deemed in default under this subparagraph because of the contested lien if (1)
within sixty days after being asked to do so by BNPLC, NAI bonds over to BNPLC's
reasonable satisfaction all such contested liens against the Property alleged to
secure an amount in excess of $500,000 (individually or in the aggregate), (2)
NAI diligently prosecutes such contest to completion in a manner reasonably
satisfactory to BNPLC, and (3) NAI promptly causes to be paid any amount
adjudged by a court of competent jurisdiction to be due, with all costs and
interest thereon, promptly after such judgment becomes final; provided, however,
that in any event each such contest shall be concluded and the lien, interest
and costs must be paid by NAI prior to the earlier of (i) the date that any
criminal prosecution is instituted or overtly threatened against BNPLC or its
directors, officers or employees because of the nonpayment thereof, (ii) the
date that any writ or order is issued under which the Property or any other
property in which BNPLC has an interest may be seized or sold or any other
action is taken against BNPLC or any property in which BNPLC has an interest
because of the nonpayment thereof, or (iii) a Designated Sale Date upon which,
for any reason, NAI or an Affiliate of NAI or any Applicable Purchaser shall not
purchase BNPLC's interest in the Property pursuant to the Purchase Agreement for
a price to BNPLC (when taken together with any additional payments made by NAI
pursuant to Paragraph 1(A)(2) of the Purchase Agreement, in the case of a
purchase by an Applicable Purchaser) equal to the Break Even Price.

(d) Repair, Maintenance, Alterations and Additions.  NAI shall keep the Property
in good order, operating condition and appearance and shall cause all necessary
repairs, renewals and replacements to be promptly made. NAI will not allow any
of the Property to be materially misused, abused or wasted, and NAI shall
promptly replace any worn-out fixtures and Personal Property with fixtures and
Personal Property comparable to the replaced items when new. NAI shall not,
without the prior consent of BNPLC, (i) remove from the Property any fixture or
Personal Property having significant value except such as are replaced by NAI by
fixtures or Personal Property of equal suitability and value, free and clear of
any lien or security interest (and for purposes of this clause "significant
value" will mean any fixture or Personal Property that has a value of more than
$100,000 or that, when considered together with all other fixtures and Personal
Property removed and not replaced by NAI by items of equal suitability and
value, has an aggregate value of $500,000 or more) or (ii) make material new
Improvements or alter Improvements in any material respect, except as part of
the Work performed in accordance with the Construction Management Agreement.
Without limiting the foregoing, NAI will notify BNPLC before making any
significant alterations to the Improvements after the completion of the
Construction Project. Nothing in this subparagraph, however, is intended to
limit NAI's rights and obligations under other express provisions of this
Improvements Lease and the Construction Management Agreement with respect to the
Construction Project.

(e) Permitted Encumbrances and Development Documents.  NAI shall during the Term
comply with and will cause to be performed all of the covenants, agreements and
obligations imposed upon the owner of any interest in the Property by the
Permitted Encumbrances (including the Existing Space Leases) or the Development
Documents. Without limiting the foregoing, NAI shall cause all amounts to be
paid when due, the payment of which is secured by any Lien against the Property
created by the Permitted Encumbrances. Without the prior consent of BNPLC, NAI
shall not enter into, initiate, approve or consent to any modification of any
Permitted Encumbrance or Development Document that would create or

                                       23
<PAGE>   30


expand or purport to create or expand obligations or restrictions which would
encumber BNPLC's interest in the Property. (Whether BNPLC must give any such
consent requested by NAI during the Term of this Improvements Lease shall be
governed by subparagraph 3(A) of the Closing Certificate and Agreement.)

(f) Books and Records Concerning the Property.  NAI shall keep books and records
that are accurate and complete in all material respects for the Property and,
subject to Paragraph 16.(c), will permit all such books and records (including
all contracts, statements, invoices, bills and claims for labor, materials and
services supplied for the construction and operation of any Improvements) to be
inspected and copied by BNPLC. This subparagraph shall not be construed as
requiring NAI to regularly maintain separate books and records relating
exclusively to the Property; provided, however, that upon request, NAI shall
construct or abstract from its regularly maintained books and records
information required by this subparagraph relating to the Property.

12. FINANCIAL COVENANTS AND OTHER COVENANTS INCORPORATED BY REFERENCE TO
SCHEDULE
1.  Throughout the Term of this Improvements Lease, NAI shall comply with the
requirements of Schedule 1 attached hereto.

13. FINANCIAL STATEMENTS AND OTHER REPORTS.

(a) Financial Statements; Required Notices; Certificates.  Throughout the Term
of this Improvements Lease, NAI shall deliver to BNPLC and to each Participant:

    (i) as soon as available and in any event within one hundred twenty days
    after the end of each fiscal year of NAI, a consolidated balance sheet of
    NAI and its Consolidated Subsidiaries as of the end of such fiscal year and
    a consolidated income statement and statement of cash flows of NAI and its
    Consolidated Subsidiaries for such fiscal year, all in reasonable detail and
    all prepared in accordance with GAAP and accompanied by a report and opinion
    of accountants of national standing selected by NAI, which report and
    opinion shall be prepared in accordance with generally accepted auditing
    standards and shall not be subject to any qualifications or exceptions as to
    the scope of the audit nor to any qualification or exception which BNPLC
    determines, in BNPLC's reasonable discretion, is unacceptable;

    (ii) as soon as available and in any event within sixty days after the end
    of each of the first three quarters of each fiscal year of NAI, the
    consolidated balance sheet of NAI and its Consolidated Subsidiaries as of
    the end of such quarter and the consolidated income statement and the
    consolidated statement of cash flows of NAI and its Consolidated
    Subsidiaries for the period commencing at the end of the previous fiscal
    year and ending with the end of such quarter, all in reasonable detail and
    all prepared in accordance with GAAP and certified by the chief financial
    officer or controller of NAI (subject to year-end adjustments);

    (iii) together with the financial statements furnished in accordance with
    subparagraph 13.(a)(i)and 13.(a)(ii), a certificate of the chief financial
    officer or controller of NAI: (i) certifying that to the knowledge of NAI no
    Default or Event of Default under this Improvements Lease has occurred and
    is continuing or, if a Default or Event of Default has occurred and is
    continuing, a brief statement as to the nature thereof and the action which
    is proposed to be taken with respect thereto, (ii) certifying that the
    representations of NAI set forth in the Operative Documents are true and
    correct in all material respects as of the date thereof as though made on
    and as of the date thereof or, if not then true and correct, a brief
    statement as to why such representations are no longer true and correct, and
    (iii) with computations demonstrating compliance with the financial
    covenants contained in Schedule 1;

    (iv) within five days after the end of each calendar month, a certificate of
    the chief financial officer or controller of NAI certifying that at the end
    of the preceding calendar month, NAI had sufficient cash and other assets
    described in Paragraph 1 of Part II of Schedule 1 to comply with the
    requirements of that paragraph;


                                       24
<PAGE>   31


    (v) promptly after the sending or filing thereof, copies of all proxy
    statements, financial statements and reports which NAI sends to NAI's
    stockholders, and copies of all regular, periodic and special reports, and
    all registration statements (other than registration statements on Form S-8
    or any form substituted therefor) which NAI files with the Securities and
    Exchange Commission or any governmental authority which may be substituted
    therefor, or with any national securities exchange;

    (vi) upon request by BNPLC, a statement in writing certifying that the
    Operative Documents are unmodified and in full effect (or, if there have
    been modifications, that the Operative Documents are in full effect as
    modified, and setting forth such modifications) and the dates to which the
    Base Rent has been paid and either stating that to the knowledge of NAI no
    Default or Event of Default under this Improvements Lease has occurred and
    is continuing or, if a Default or Event of Default under this Improvements
    Lease has occurred and is continuing, a brief statement as to the nature
    thereof; it being intended that any such statement by NAI may be relied upon
    by any prospective purchaser or mortgagee of the Property and by the
    Participants

    (vii) as soon as possible after, and in any event within ten days after NAI
    becomes aware that, any of the following has occurred, with respect to which
    the potential aggregate liability to NAI relating thereto is $500,000 or
    more, a notice signed by a senior financial officer of NAI setting forth
    details of the following and the response, if any, which NAI or its ERISA
    Affiliate proposes to take with respect thereto (and a copy of any report or
    notice required to be filed with or given to PBGC by NAI or an ERISA
    Affiliate with respect to any of the following or the events or conditions
    leading up to the following): (A) the assertion, to secure any Unfunded
    Benefit Liabilities, of any Lien against the assets of NAI, against the
    assets of any Plan or Multiemployer Plan or against any interest of BNPLC or
    NAI in the Property, or (B) the taking of any action by the PBGC or any
    other governmental authority against NAI to terminate any Plan of NAI or any
    ERISA Affiliate of NAI or to cause the appointment of a trustee or receiver
    to administer any such Plan ; and

    (viii) such other information respecting the condition or operations,
    financial or otherwise, of NAI, of any of its Subsidiaries or of the
    Property as BNPLC or any Participant through BNPLC may from time to time
    reasonably request.

BNPLC is hereby authorized to deliver a copy of any information or certificate
delivered to it pursuant to this subparagraph to BNPLC's Parent, to the
Participants and to any regulatory body having jurisdiction over BNPLC or
BNPLC's Parent or any Participant that requires or requests it.

14.            ASSIGNMENT AND SUBLETTING BY NAI.

(a) BNPLC's Consent Required.  Without the prior consent of BNPLC, NAI shall not
assign, transfer, mortgage, pledge or hypothecate this Improvements Lease or any
interest of NAI hereunder and shall not sublet all or any part of the Property,
by operation of law or otherwise; provided, that subject to subparagraph 14.(c)
below, if (and after) NAI completes the Construction Project pursuant to the
Construction Management Agreement and so long as no Event of Default has
occurred and is continuing: (1) NAI shall be entitled to sublet no more than
forty-nine percent (49%) (computed on the basis of square footage) of the
useable space in then existing and completed building Improvements, if any, so
long as (i) any sublease by NAI is made expressly subject and subordinate to the
terms hereof, and (ii) such sublease has a term equal to or less than the
remainder of the then effective Term of this Improvements Lease; and (2) NAI
shall be entitled to assign or transfer this Improvements Lease or any interest
of NAI hereunder to an Affiliate of NAI if both NAI and its Affiliate confirm
their joint and several liability hereunder by written notice given to BNPLC.

(b) Standard for BNPLC's Consent to Assignments and Certain Other Matters.
Consents and approvals of BNPLC which are required by this Paragraph will not be
unreasonably withheld or delayed, but NAI acknowledges that BNPLC's withholding
of such consent or approval shall be reasonable if BNPLC determines in good
faith that (1) giving the approval may materially increase BNPLC's risk of
liability for any existing or future environmental problem, or (2) giving the


                                       25
<PAGE>   32


approval is likely to increase BNPLC's administrative burden of complying with
or monitoring NAI's compliance with the requirements of this Improvements Lease.

(c) Consent Not a Waiver.  No consent by BNPLC to a sale, assignment, transfer,
mortgage, pledge or hypothecation of this Improvements Lease or NAI's interest
hereunder, and no assignment or subletting of the Property or any part thereof
in accordance with this Improvements Lease or otherwise with BNPLC's consent,
shall release NAI from liability hereunder; and any such consent shall apply
only to the specific transaction thereby authorized and shall not relieve NAI
from any requirement of obtaining the prior consent of BNPLC to any further
sale, assignment, transfer, mortgage, pledge or hypothecation of this
Improvements Lease or any interest of NAI hereunder.

15. ASSIGNMENT BY BNPLC.

(a) Restrictions on Transfers.  Except by a Permitted Transfer, BNPLC shall not
assign, transfer, mortgage, pledge, encumber or hypothecate this Improvements
Lease or the other Operative Documents or any interest of BNPLC in and to the
Property during the Term without the prior consent of NAI, which consent NAI may
withhold in its sole discretion. Further, notwithstanding anything to the
contrary herein contained, if withholding taxes are imposed on the rents and
other amounts payable to BNPLC hereunder because of BNPLC's assignment of this
Improvements Lease to any citizen of, or any corporation or other entity formed
under the laws of, a country other than the United States, NAI shall not be
required to compensate BNPLC or any such assignee for the withholding tax. If,
in breach of this subparagraph, BNPLC transfer the Property or any part thereof
by a conveyance or that does not constitute a Permitted Transfer, with the
result that additional transfer taxes or other Impositions are assessed against
the Property or the owner thereof, BNPLC shall be required to pay such
additional transfer taxes or other Impositions.

(b) Effect of Permitted Transfer or other Assignment by BNPLC.  If, without
breaching subparagraph 15.(a), BNPLC sells or otherwise transfers the Property
and assigns all of its rights under this Improvements Lease and the other
Operative Documents, then BNPLC shall thereby be released from any obligations
arising after such assumption under this Improvements Lease or the other
Operative Documents (other than any liability for a breach of any continuing
obligation to provide Construction Advances under the Construction Management
Agreement), and NAI shall look solely to each successor in interest of BNPLC for
performance of such obligations.

16. BNPLC's RIGHT OF ACCESS.

(a) During the Term, BNPLC and BNPLC's representatives may (subject to
subparagraph 16.(c)) enter the Property at any reasonable time after five
Business Days advance written notice to NAI for the purpose of making
inspections or performing any work BNPLC is authorized to undertake by the next
subparagraph or for the purpose confirming whether NAI has complied with the
requirements of this Improvements Lease or the other Operative Documents.

(b) If NAI fails to perform any act or to take any action required of it by this
Improvements Lease or the Closing Certificate, or to pay any money which NAI is
required by this Improvements Lease or the Closing Certificate to pay, and if
such failure or action constitutes an Event of Default or renders BNPLC or any
director, officer, employee or Affiliate of BNPLC at risk of criminal
prosecution or renders BNPLC's interest in the Property or any part thereof at
risk of forfeiture by forced sale or otherwise, then in addition to any other
remedies specified herein or otherwise available, BNPLC may, perform or cause to
be performed such act or take such action or pay such money. Any expenses so
incurred by BNPLC, and any money so paid by BNPLC, shall be a demand obligation
owing by NAI to BNPLC. Further, BNPLC, upon making such payment, shall be
subrogated to all of the rights of the person, corporation or body politic
receiving such payment. But nothing herein shall imply any duty upon the part of
BNPLC to do any work which under any provision of this Improvements Lease NAI
may be required to perform, and the performance thereof by BNPLC shall not
constitute a waiver of NAI's default. BNPLC may during the progress of any such
work permitted by BNPLC hereunder on or in the Property keep and store upon the
Property all

                                       26
<PAGE>   33


necessary materials, tools, and equipment. BNPLC shall not in any event be
liable for inconvenience, annoyance, disturbance, loss of business, or other
damage to NAI or the subtenants or invitees of NAI by reason of making such
repairs or the performance of any such work on or in the Property, or on account
of bringing materials, supplies and equipment into or through the Property
during the course of such work (except for any liability in excess of the
liability insurance limits established in Exhibit B resulting from death or
injury or damage to the property of third parties caused by the Established
Misconduct of BNPLC or its officers, employees, or agents in connection
therewith), and the obligations of NAI under this Improvements Lease shall not
thereby be excused in any manner.

(c) NAI shall have no obligation to provide proprietary information (as defined
in the next sentence) to BNPLC, except and to the extent that (1) BNPLC
reasonably determines that BNPLC cannot accomplish the purposes of BNPLC's
inspection of the Property or exercise of other rights granted pursuant to the
various express provisions of this Improvements Lease and the other Operative
Documents without evaluating such information. For purposes of this Improvements
Lease "PROPRIETARY INFORMATION" includes NAI's intellectual property, trade
secrets and other confidential information of value to NAI about, among other
things, NAI's manufacturing processes, products, marketing and corporate
strategies, but in no event will "proprietary information" include any
disclosure of substances and materials (and their chemical composition) which
are or previously have been present in, on or under the Property at the time of
any inspections by BNPLC, nor will "proprietary information" include any
additional disclosures reasonably required to permit BNPLC to determine whether
the presence of such substances and materials has constituted a violation of
Environmental Laws. In addition, under no circumstances shall NAI have any
obligation to disclose to BNPLC or any other party any proprietary information
of NAI (including, without limitation, any pending applications for patents or
trademarks, any research and design and any trade secrets) except if and to the
limited extent reasonably necessary to comply with the express provisions of
this Improvements Lease or the other Operative Documents.

17. EVENTS OF DEFAULT. Each of the following events shall be an "EVENT OF
DEFAULT" by NAI under this Improvements Lease:

(a) NAI shall fail to pay when due any installment of Rent due hereunder and
such failure shall continue for three (3) Business Days after NAI is notified in
writing thereof.

(b) NAI shall fail to cause any representation or warranty of NAI contained
herein or in the Construction Management Agreement or the Closing Certificate
that was false or misleading in any material respect when made to be made true
and not misleading (other than as described in the other clauses of this
Paragraph 17), or NAI shall fail to comply with any term, provision or covenant
of this Improvements Lease or of the Construction Management Agreement or the
Closing Certificate (other than as described in the other clauses of this
Paragraph 17), and in either case shall not cure such failure prior to the
earlier of (A) thirty days after written notice thereof is sent to NAI or (B)
the date any writ or order is issued for the levy or sale of any property owned
by BNPLC (including the Property) or any criminal prosecution is instituted or
overtly threatened against BNPLC or any of its directors, officers or employees
because of such failure; provided, however, that so long as no such writ or
order is issued and no such criminal prosecution is instituted or overtly
threatened, the period within which such failure may be cured by NAI shall be
extended for a further period (not to exceed an additional sixty days) as shall
be necessary for the curing thereof with diligence, if (but only if) (x) such
failure is susceptible of cure but cannot with reasonable diligence be cured
within such thirty day period, (y) NAI shall promptly have commenced to cure
such failure and shall thereafter continuously prosecute the curing thereof with
reasonable diligence and (z) the extension of the period for cure will not, in
any event, cause the period for cure to extend beyond five days prior to the
expiration of this Improvements Lease.

(c) NAI shall abandon the Property.

(d) NAI or any Subsidiary shall fail to make any payment or payments of
principal, premium or interest, of Debt of NAI described in the next sentence
when due (taking into consideration the time NAI may have to cure such failure,
if any, under the documents governing such Debt). As used in this clause
14(a)(v), "DEBT" shall include only Debt (as defined in the Common


                                       27
<PAGE>   34


Definitions and Provisions Agreement (Phase II - Improvements)) of NAI or any of
its Subsidiaries now existing or arising in the future (a) payable to BNPLC or
any Affiliate of BNPLC, or (B) payable to any other Person and with respect to
which $3,000,000 or more is actually due and payable because of acceleration or
otherwise.

(e) NAI: (a) shall generally not, or be unable to, or shall admit in writing its
inability to, pay its debts as such debts become due; or (b) shall make an
assignment for the benefit of creditors, petition or apply to any tribunal for
the appointment of a custodian, receiver or trustee for it or a substantial part
of its assets; or (c) shall file any petition or application to commence any
proceeding under any bankruptcy, reorganization, arrangement, readjustment of
debt, dissolution or liquidation law or statute of any jurisdiction, whether now
or hereafter in effect; or (d) shall have had any such petition or application
filed against it; or (e) by any act or omission shall indicate its consent to,
approval of or acquiescence in any such petition, application or proceeding or
order for relief or the appointment of a custodian, receiver or trustee for all
or any substantial part of its property; or (f) shall suffer any such
custodianship, receivership or trusteeship to continue undischarged for a period
of sixty days or more.

(f) One or more final judgments, decrees or orders for the payment of money in
excess of $3,000,000 in the aggregate shall be rendered against NAI and such
judgments, decrees or orders shall continue unsatisfied and in effect for a
period of thirty consecutive days without NAI's having obtained an agreement (or
after the expiration or termination of an agreement) of the Persons entitled to
enforce such judgment, decrees or orders not to enforce the same pending
negotiations with NAI concerning the satisfaction or other discharge of the
same.

(g) NAI shall breach the requirements of Paragraph 12, which by reference to
Schedule 1 establishes certain financial covenants and other requirements.

(h) as of the effective date of this Improvements Lease, any of the
representations or warranties of NAI contained in subparagraphs 2(A) - (J) of
the Closing Certificate shall be false or misleading in any material respect.

(i) NAI shall fail to pay the full amount of any Supplemental Payment required
by the Purchase Agreement on the Designated Sale Date or shall fail to provide
Collateral as and when due pursuant to the Pledge Agreement Documents.

(j) NAI shall fail to comply with any term, provision or condition of the Pledge
Agreements after the expiration of any applicable notice and cure period set
forth in the Pledge Agreement.

18. REMEDIES.

(a) Basic Remedies.  At any time after an Event of Default and after BNPLC has
given any notice required by subparagraph 18.(b), BNPLC shall be entitled at
BNPLC's option (and without limiting BNPLC in the exercise of any other right or
remedy BNPLC may have, and without any further demand or notice except as
expressly described in this subparagraph 18.(a)), to exercise any one or more of
the following remedies:

    (i) By notice to NAI, BNPLC may terminate NAI's right to possession of the
    Property. A notice given in connection with unlawful detainer proceedings
    specifying a time within which to cure a default shall terminate NAI's right
    to possession if NAI fails to cure the default within the time specified in
    the notice.

    (ii) Upon termination of NAI's right to possession and without further
    demand or notice, BNPLC may re-enter the Property in any manner not
    prohibited by Applicable Law and take possession of all improvements,
    additions, alterations, equipment and fixtures thereon and remove any
    persons in possession thereof. Any property in the Improvements may be
    removed and stored in a warehouse or elsewhere at the expense and risk of
    and for the account of NAI.

                                       28
<PAGE>   35


    (iii) Upon termination of NAI's right to possession, this Improvements Lease
    shall terminate and BNPLC may recover from NAI:

           a) The worth at the time of award of the unpaid Rent which had been
           earned at the time of termination;

           b) The worth at the time of award of the amount by which the unpaid
           Rent which would have been earned after termination until the time of
           award exceeds the amount of such rental loss that NAI proves could
           have been reasonably avoided;

           c) The worth at the time of award of the amount by which the unpaid
           Rent for the balance of the scheduled Term after the time of award
           exceeds the amount of such rental loss that NAI proves could be
           reasonably avoided; and

           d) Any other amount necessary to compensate BNPLC for all the
           detriment proximately caused by NAI's failure to perform NAI's
           obligations under this Improvements Lease or which in the ordinary
           course of things would be likely to result therefrom, including the
           costs and expenses (including Attorneys' Fees, advertising costs and
           brokers' commissions) of recovering possession of the Property,
           removing persons or property therefrom, placing the Property in good
           order, condition, and repair, preparing and altering the Property for
           reletting, all other costs and expenses of reletting, and any loss
           incurred by BNPLC as a result of NAI's failure to perform NAI's
           obligations under the other Operative Documents.

           The "WORTH AT THE TIME OF AWARD" of the amounts referred to in
           subparagraph 18.(a)(iii)a) and subparagraph 18.(a)(iii)b) shall be
           computed by allowing interest at the Default Rate. The "WORTH AT THE
           TIME OF AWARD" of the amount referred to in subparagraph
           18.(a)(iii)c) shall be computed by discounting such amount at the
           discount rate of the Federal Reserve Bank of San Francisco at the
           time of award plus one percent (1%).

           e) Such other amounts in addition to or in lieu of the foregoing as
           may be permitted from time to time by applicable California law.

    (iv) BNPLC shall have the remedy described in California Civil Code Section
    1951.4 (lessor may continue lease in force even after lessee's breach and
    abandonment and recover rent as it becomes due, if lessee has right to
    sublet or assign, subject only to reasonable limitations). Accordingly, even
    if NAI has breached this Improvements Lease and abandoned the Property, this
    Improvements Lease shall continue in effect for so long as BNPLC does not
    terminate NAI's right to possession, and BNPLC may enforce all of BNPLC's
    rights and remedies under this Improvements Lease, including the right to
    recover the Rent as it becomes due under this Improvements Lease. NAI's
    right to possession shall not be deemed to have been terminated by BNPLC
    except pursuant to subparagraph 18.(a)(i) hereof. The following shall not
    constitute a termination of NAI's right to possession:

           a) Acts of maintenance or preservation or efforts to relet the
           Property;

           b) The appointment of a receiver upon the initiative of BNPLC to
           protect BNPLC's interest under this Improvements Lease; or

           c) Reasonable withholding of consent to an assignment or subletting,
           or terminating a subletting or assignment by NAI.

                                       29
<PAGE>   36


(b) Notice Required So Long As the Purchase Option and NAI's Initial Remarketing
Rights and Obligations Continue Under the Purchase Agreement.  So long as NAI
remains in possession of the Property and there has been no termination of the
Purchase Option and NAI's Initial Remarketing Rights and Obligations as provided
Paragraph 4 of the Purchase Agreement, BNPLC's right to exercise remedies
provided in subparagraph 18.(a) will be subject to the condition precedent that
BNPLC shall have notified NAI, at a time when an Event of Default shall have
occurred and be continuing, of BNPLC's intent to exercise remedies provided in
subparagraph 18.(a) at least sixty days prior to exercising the remedies. The
condition precedent is intended to provide NAI with an opportunity to exercise
the Purchase Option or NAI's Initial Remarketing Rights and Obligations before
losing possession of the Property pursuant to subparagraph 18.(a).  The
condition precedent is not, however, intended to extend any period for curing an
Event of Default. Accordingly, if an Event of Default has occurred, and
regardless of whether any Event of Default is then continuing, BNPLC may proceed
immediately to exercise remedies provided in subparagraph 18.(a) at any time
after the earlier of (i) sixty days after BNPLC has given such a notice to NAI,
(ii) any date upon which NAI relinquishes possession of the Property, or (iii)
any termination of the Purchase Option and NAI's Initial Remarketing Rights and
Obligations.

(c) Enforceability.  This Paragraph shall be enforceable to the maximum extent
not prohibited by Applicable Law, and the unenforceability of any provision in
this Paragraph shall not render any other provision unenforceable.

(d) Remedies Cumulative.  No right or remedy herein conferred upon or reserved
to BNPLC is intended to be exclusive of any other right or remedy, and each and
every such right and remedy shall be cumulative and in addition to any other
right or remedy given to BNPLC hereunder or now or hereafter existing in favor
of BNPLC under Applicable Law or in equity. In addition to other remedies
provided in this Improvements Lease, BNPLC shall be entitled, to the extent
permitted by Applicable Law or in equity, to injunctive relief in case of the
violation, or attempted or threatened violation, of any of the covenants,
agreements, conditions or provisions of this Improvements Lease, or to a decree
compelling performance of any of the other covenants, agreements, conditions or
provisions of this Improvements Lease to be performed by NAI, or to any other
remedy allowed to BNPLC at law or in equity. Nothing contained in this
Improvements Lease shall limit or prejudice the right of BNPLC to prove for and
obtain in proceedings for bankruptcy or insolvency of NAI by reason of the
termination of this Improvements Lease, an amount equal to the maximum allowed
by any statute or rule of law in effect at the time when, and governing the
proceedings in which, the damages are to be proved, whether or not the amount be
greater, equal to, or less than the amount of the loss or damages referred to
above. Without limiting the generality of the foregoing, nothing contained
herein shall modify, limit or impair any of the rights and remedies of BNPLC
under the Purchase Documents, and BNPLC shall not be required to give the sixty
day notice described in subparagraph 18.(b) as a condition precedent to any
acceleration of the Designated Sale Date or to taking any action to enforce the
Purchase Documents.

19. DEFAULT BY BNPLC. If BNPLC should default in the performance of any of its
obligations under this Improvements Lease, BNPLC shall have the time reasonably
required, but in no event less than thirty days, to cure such default after
receipt of notice from NAI specifying such default and specifying what action
NAI believes is necessary to cure the default. If NAI prevails in any litigation
brought against BNPLC because of BNPLC's failure to cure a default within the
time required by the preceding sentence, then NAI shall be entitled to an award
against BNPLC for the monetary damages proximately caused to NAI by such
default.

Notwithstanding the foregoing, BNPLC's right to cure as provided in this
Paragraph will not in any event extend the time within which BNPLC must remove
Liens Removable by BNPLC as required by Paragraph beyond the Designated Sale
Date.

20. QUIET ENJOYMENT. Provided NAI pays the Base Rent and all Additional Rent
payable hereunder as and when due and payable and keeps and fulfills all of the
terms, covenants, agreements and conditions to be performed by NAI hereunder,
BNPLC shall not during the Term disturb NAI's peaceable and quiet enjoyment of
the Property; however, such enjoyment shall be subject to the terms, provisions,
covenants, agreements and conditions of this Improvements Lease, to Permitted


                                       30
<PAGE>   37


Encumbrances, to Development Documents and to any other claims not constituting
Liens Removable by BNPLC. If any Lien Removable by BNPLC is claimed against the
Property, BNPLC will remove the Lien Removable by BNPLC promptly. Any breach by
BNPLC of this Paragraph shall render BNPLC liable to NAI for any monetary
damages proximately caused thereby, but as more specifically provided in
subparagraph 4.(b) above, no such breach shall entitle NAI to terminate this
Improvements Lease or excuse NAI from its obligation to pay Rent.

21. SURRENDER UPON TERMINATION. Unless NAI or an Applicable Purchaser purchases
or has purchased BNPLC's entire interest in the Property pursuant to the terms
of the Purchase Agreement and BNPLC's entire interest in the Improvements and
other "Property" under (and as defined in) the Other Purchase Agreement, NAI
shall, upon the termination of NAI's right to occupancy, surrender to BNPLC the
Property, including Improvements constructed by NAI and fixtures and furnishings
included in the Property, free of all Hazardous Substances (including Permitted
Hazardous Substances) and tenancies and with all Improvements in substantially
the same condition as of the date the same were initially completed, excepting
only (i) ordinary wear and tear that occurs between the maintenance, repairs and
replacements required by other provisions of this Improvements Lease or the
Other Lease Agreement, and (ii) demolition, alterations and additions which are
expressly permitted by the terms of this Improvements Lease or the Other Lease
Agreement and which have been completed by NAI in a good and workmanlike manner
in accordance with all Applicable Laws. Any movable furniture or movable
personal property belonging to NAI or any party claiming under NAI, if not
removed at the time of such termination and if BNPLC shall so elect, shall be
deemed abandoned and become the property of BNPLC without any payment or offset
therefor. If BNPLC shall not so elect, BNPLC may remove such property from the
Property and store it at NAI's risk and expense.

22. HOLDING OVER BY NAI. Should NAI not purchase BNPLC's right, title and
interest in the Property as provided in the Purchase Agreement, but nonetheless
continue to hold the Property after the termination of this Improvements Lease
without BNPLC's consent, whether such termination occurs by lapse of time or
otherwise, such holding over shall constitute and be construed as a tenancy from
day to day only, at a daily Base Rent equal to: (i) Stipulated Loss Value on the
day in question, times (ii) the Default Rate for such day; divided by (iii)
three hundred and sixty; subject, however, to all of the terms, provisions,
covenants and agreements on the part of NAI hereunder. No payments of money by
NAI to BNPLC after the termination of this Improvements Lease shall reinstate,
continue or extend the Term of this Improvements Lease and no extension of this
Improvements Lease after the termination thereof shall be valid unless and until
the same shall be reduced to writing and signed by both BNPLC and NAI.

23. INDEPENDENT OBLIGATIONS EVIDENCED BY THE OTHER OPERATIVE DOCUMENTS. NAI
acknowledges and agrees that nothing contained in this Improvements Lease shall
limit, modify or otherwise affect any of NAI's obligations under the other
Operative Documents, which obligations are intended to be separate, independent
and in addition to, and not in lieu of, the obligations set forth herein. In the
event of any inconsistency between the express terms and provisions of the
Purchase Documents and the express terms and provisions of this Improvements
Lease, the express terms and provisions of the Purchase Documents shall control.
In the event of any inconsistency between the express terms and provisions of
the Construction Management Agreement or the Closing Certificate and the express
terms and provisions of this Improvements Lease, the express terms and
provisions of this Improvements Lease shall control; provided, nothing herein
will limit or impair NAI's obligations under the Closing Certificate following
any expiration of termination of this Improvements Lease.


                          [The signature pages follow.]


                                       31
<PAGE>   38


        IN WITNESS WHEREOF, NAI and BNPLC have caused this Improvements Lease
Agreement to be executed as of May 3, 1999.

                                      "NAI"

                                      NETWORK APPLIANCE, INC.

                                      By:
                                           -------------------------------------
                                           Name:
                                                 -------------------------------
                                                 Title:

                                       32
<PAGE>   39


[Continuation of signature pages to Lease Agreement dated to be effective May 3,
1999]

                                     "BNPLC"

                                      BNP LEASING CORPORATION

                                      By:---------------------------------------

                                         Lloyd G. Cox, Vice President




                                       33

<PAGE>   40

                                   Exhibit A

                                LEGAL DESCRIPTION

All that certain real property situate in the City of Sunnyvale, State of
California, described as follows:

PARCEL ONE

All of Parcel "A" as said Parcel is shown upon that certain Parcel Map entitled
"For: Moffett Park Association, being a Redivision of Parcel "B" of Parcel Map
recorded in Book 292 of Maps in Page 41", which Map was filed for record in the
Office of the Recorder of the County of Santa Clara, State of California, on
August 28, 1974 in Book 345 of Map, at Page 20.

PARCEL TWO

An Easement for pedestrian and motor vehicle Right-of-Way for the purpose of
ingress over a portion of land more particularly described as follows:

A 15 foot strip of land over a portion of "Parcel "A", as said Parcel "A" is
shown on that certain Parcel Map filed for record on October 25, 1966 in Book
216 of Maps, at Page 2, records of Santa Clara County, and being more
particularly described as follows:

Commencing at the Northeast corner of said Parcel "A", said Northeast corner
also being a point on the center line of Crossman Road (90.00 feet wide); thence
North 75 deg 07' 58" West along the Northerly line of said parcel "A", a
distance of 85.00 feet to the True Point of Beginning of this description;
thence continuing along said Northerly line North 75 deg 07' 58" West, a
distance of 322.50 feet; thence South 14 deg 52' 02" West, a distance of 15.00
feet; thence South 75 deg 07' 58" East parallel with and distance 15.00 feet
Southerly measured at right angles from the Northerly line of said Parcel "A" a
distance of 322.50 feet; thence North 14 deg 52' 02" East, a distance of 15.00
feet to the True Point of Beginning.



                                       1

<PAGE>   41


                                   Exhibit B

                             INSURANCE REQUIREMENTS

I.      LIABILITY INSURANCE:

        A. NAI must maintain commercial general liability ("CGL") insurance on
an occurrence basis, affording immediate protection to the limit of not less
than $20,000,000 combined single limit for bodily and personal injury, death and
property damage in respect of any one occurrence. The CGL insurance must be
primary to, and shall receive no contribution from, any insurance policies or
self-insurance programs otherwise afforded to or available to the Interested
Parties, collectively or individually. Further, the CGL insurance must include
blanket contractual liability coverage which insures contractual liability under
the indemnifications set forth in this Improvements Lease (though such coverage
or the amount thereof shall in no way limit such indemnifications).

        B. Any deductible or self-insured retention applicable to the CGL
insurance shall not exceed $1,000 at any time when NAI shall continue to have
the right to exercise any Issue 97-10 Election, or shall have previously
exercised an Issue 97-10 Election. After the expiration of NAI's right to
exercise any Issue 97-10 Election, and provided no Issue 97-10 Election has been
exercised by NAI, NAI may increase any deductible or self-insured retention
applicable to such insurance, but not to an amount in excess of $500,000.

        C. The forms of insurance policies (including endorsements) used to
provide the CGL insurance required by this Improvements Lease, and the insurance
company or companies providing the CGL insurance, must be acceptable to BNPLC.
BNPLC shall have the right from time to time and at any time to review and
approve such policy forms (including endorsements) and the insurance company or
companies providing the insurance. Without limiting the generality of the
foregoing, BNPLC may reasonably require (and unless and until NAI is otherwise
notified by BNPLC, BNPLC does require) that such insurance be provided under
forms and by companies consistent with the following:

               (1) Forms: CGL Insurance must be provided on Insurance Services
               Office ("ISO") forms CG 0001 1093 or CG 0001 0196 or equivalent
               substitute forms providing the same or greater coverage.

               (2) Rating Requirements: Insurance must be provided through
               insurance or reinsurance companies rated by the A.M. Best Company
               of Oldwick, New Jersey as having a policyholder's rating of A or
               better and a reported financial information rating of X or
               better.

               (3) Required Endorsements: CGL Insurance must be endorsed to
               provide or include:

                    (a) in any policy containing a general aggregate limit, ISO
               form amendment "Aggregate Limits of Insurance Per Location" CG
               2504 1185 or equivalent substitute form;

                    (b) a waiver of subrogation, using ISO form CG 2404 1093 or
               equivalent substitute form (and under the commercial umbrella, if
               any), in favor of "BNP Leasing Corporation and other Interested
               Parties (as defined in the Common Definitions and Provisions
               Agreement (Phase II - Improvements) between Network Appliance,
               Inc. and BNP Leasing Corporation dated May 3, 1999)";

                    (c) ISO additional insured form CG 2026 1185 or equivalent
               substitute form, without modification (and under the commercial
               umbrella, if any), designating as additional insureds "BNPLC and
               other Interested Parties, as defined in the Common Definitions
               and Provisions Agreement



                                       1
<PAGE>   42


               (Phase II - Improvements) between Network Appliance, Inc. and BNP
               Leasing Corporation dated May 3, 1999)"; and

                    (d) provisions entitling BNPLC to 30 days' notice from the
               insurer prior to any cancellation, nonrenewal or material
               modification to the CGL coverage.

               (4) Other Insurance: Each policy to contain standard CGL "other
               insurance" wording, unmodified in any way that would make it
               excess over or contributory with the additional insured's own
               commercial general liability coverage.

II. PROPERTY INSURANCE:

        A. NAI must maintain property insurance in "special form" (including
theft) or against "all risks," providing the broadest available coverage for all
Improvements (as defined in the Common Provisions and Definitions Agreement but
excluding those Improvements to be demolished by NAI prior to the commencement
of construction contemplated in the Construction Management Agreement) and
equipment included in the Property, on a blanket basis if multiple buildings are
involved, with no exclusions for vandalism, malicious mischief, or sprinkler
leakage, and including coverage against earthquake and all coverage perils
normally included within the definitions of extended coverage, vandalism,
malicious mischief and, if the Property is in a flood zone, flood. In addition,
boiler and machinery coverage must be maintained at all times by endorsement to
the property insurance policy or by separate policy. Also, during any period of
significant construction on any Improvements, the property insurance must
include builder's completed value risk insurance for such Improvements, with no
protective safeguard endorsement, and (without limiting the other requirements
of this Exhibit) builder's completed value risk insurance must provide the
following coverages:

            (1)   materials and supplies at other locations awaiting
                  installation;

            (2)   materials and supplies in transit to the worksite for
                  installation;

            (3)   loss of use or consequential loss;

            (4)   pollutant cleanup and removal;

            (5)   freezing;

            (6)   collapse during construction, resulting from fault, defect,
                  error or omission in design, plan, specification or
                  workmanship;

            (7)   construction ordinance or law;

            (8)   mechanical or electrical breakdown;

            (9)   debris removal additional limit;

            (10)  preservation of property;

            (11)  fire department service charge;

            (12)  additional interest on construction loan due to delays in the
                  completion of construction;


                                       2
<PAGE>   43


            (13)  loss of rental income;

            (14)  legal/professional fees (in the amount of no less than
                  $1,500,000) and other soft costs as reasonably determined by
                  NAI, subject to BNPLC's approval.

        B. The property insurance required hereby must provide coverage in the
amount no less than replacement value (exclusive of land, foundation, footings,
excavations and grading) with endorsements for contingent liability from
operation of building laws, increased cost of construction and demolition costs
which may be necessary to comply with building laws. Subject to the approval of
BNPLC, NAI will be responsible for determining the amount of property insurance
to be maintained from time to time, but NAI must maintain such coverage on an
agreed value basis to eliminate the effects of coinsurance.

        C. Any deductible or self-insured retention applicable to the property
insurance shall not exceed $50,000 at any time when NAI shall continue to have
the right to exercise any Issue 97-10 Election, or shall have previously
exercised an Issue 97-10 Election; provided, that with respect to earthquake
coverage the deductible may be as high as five percent of the value of the
Improvements. After the expiration of NAI's right to exercise any Issue 97-10
Election, and provided no Issue 97-10 Election has been exercised by NAI, NAI
may increase any deductible or self-insured retention applicable to such
insurance, provided the increased amount shall not exceed (1) $500,000 for all
coverages other than earthquake coverage, and (2) for earthquake coverage only,
five percent of the aggregate amount of the property insurance required to
satisfy this Improvements Lease, calculated as described in the preceding
paragraph.

        D. The property insurance shall cover not only the value of NAI's
interest in the Improvements, but also the interest of BNPLC, with BNPLC shown
as an insured as its interests may appear.

        E. The forms of insurance policies (including endorsements) used to
provide the property insurance required by this Improvements Lease, and the
insurance company or companies providing the property insurance, must be
acceptable to BNPLC. BNPLC shall have the right from time to time and at any
time to review and approve such policy forms (including endorsements) and the
insurance company or companies providing such insurance. Without limiting the
generality of the foregoing, BNPLC may reasonably require (and unless and until
NAI is otherwise notified by BNPLC, BNPLC does require) that such insurance be
provided under forms and by companies consistent with the following:

            (1) Rating Requirements: Insurance to be provided through insurance
      or reinsurance companies rated by the A.M. Best Company of Oldwick, New
      Jersey as having (a) a policyholder's rating of A or better, (b) a
      reported financial information rating of no less than X, and (c) in the
      case of each insurance or reinsurance company, a reported financial
      information rating which indicates an adjusted policyholders' surplus
      equal to or greater than the underwriting exposure that such company has
      under the insurance or reinsurance it is providing for the Property.

            (2)   Required Endorsements: NAI's property insurance must be
                  endorsed to provide or include:

            (a)   a waiver of subrogation in favor of "BNPLC and other
                  Interested Parties, as defined in the Common Definitions and
                  Provisions Agreement (Phase II - Improvements) between Network
                  Appliance, Inc. and BNP Leasing Corporation dated May 3,
                  1999)";

            (b)   that NAI's insurance is primary, with any policies of BNPLC or
                  other Interested Parties being excess, secondary and
                  noncontributing;

            (c)   that the protection afforded to BNPLC by such insurance shall
                  not be reduced or impaired by acts or omissions of NAI or any
                  other beneficiary or insured; and


                                       3
<PAGE>   44
            (d)   that BNPLC must be notified at least thirty days prior to any
                  cancellation, nonrenewal or reduction of insurance coverage.

III.  OTHER INSURANCE RELATED REQUIREMENTS:

        A. BNPLC must be notified in writing immediately by NAI of claims
against NAI that might cause a reduction below seventy-five percent (75%) of any
aggregate limit of any policy.

        B. NAI's property insurance must be evidenced by ACORD form 27 "Evidence
of Property Insurance" completed and interlineated in a manner satisfactory to
BNPLC to show compliance with the requirements of this Exhibit. Copies of
endorsements to the property insurance must be attached to such form.

        C. NAI's CGL insurance must be evidenced by ACORD form 25 "Certificate
of Insurance" completed and interlineated in a manner satisfactory to BNPLC to
show compliance with the requirements of this Exhibit. Copies of endorsements to
the CGL insurance must be attached to such form.

        D. Such evidence of required insurance must be delivered upon execution
of this Improvements Lease and new certificate or evidence of insurance must be
delivered no later than 10 days prior to expiration of existing policy.

        E. NAI shall not cancel, fail to renew, or make or permit any material
reduction in any of the policies or certificates described in this Exhibit
without the prior written consent of BNPLC. The certificates (ACORD forms 27 and
25) described in this Exhibit must contain the following express provision:

"This is to certify that the policies of insurance described herein have been
issued to the insured Network Appliance, Inc. for whom this certificate is
executed and are in force at this time. In the event of cancellation,
non-renewal, or material reduction in coverage affecting the certificate holder,
at least sixty days prior notice shall be given to the certificate holder."

        F. The limits of liability under the liability insurance required by
this Improvements Lease may be provided by a single policy of insurance or by a
combination of primary and umbrella policies, but in no event shall the total
limits of liability available for any one occurrence or accident be less than
those required by this Exhibit.

        G. NAI shall provide copies, certified as complete and correct by an
authorized agent of the applicable insurer, of all insurance policies required
by this Exhibit within ten days after receipt of a request for such copies from
BNPLC.



                                       4
<PAGE>   45
                                   Exhibit C

                         NOTICE OF LIBOR PERIOD ELECTION

BNP Leasing Corporation
12201 Merit Drive
Suite 860
Dallas, Texas 75251
Attention: Lloyd G. Cox

        Re: Lease Agreement (Phase II - Improvements) and Lease Agreement (Phase
II - Land), both dated as of May 3, 1999, and both between Network Appliance,
Inc., as tenant, and BNP Leasing Corporation, as landlord

Gentlemen:

        Capitalized terms used in this letter are intended to have the meanings
assigned to them in the two Lease Agreements referenced above. This letter
constitutes notice to you that the LIBOR Period Election under both of the Lease
Agreements shall be:

                           ________________ month(s),

beginning with the first Base Rent Period that commences on or after:

                          ______________, ____.

NOTE: YOU SHALL BE ENTITLED TO DISREGARD THIS NOTICE IF THE NUMBER OF MONTHS
SPECIFIED ABOVE IS NOT A PERMITTED NUMBER UNDER THE DEFINITION OF "LIBOR PERIOD
ELECTION" IN THE COMMON DEFINITIONS AND PROVISIONS AGREEMENTS REFERENCED IN THE
LEASE AGREEMENTS, OR IF THE DATE SPECIFIED ABOVE CONCERNING THE COMMENCEMENT OF
THE LIBOR PERIOD ELECTION IS LESS THAN TEN BUSINESS DAYS AFTER YOUR RECEIPT OF
THIS NOTICE. HOWEVER, WE ASK THAT YOU NOTIFY US IMMEDIATELY IF FOR ANY REASON
YOU BELIEVE THIS NOTICE IS DEFECTIVE.

        Executed this _____ day of ______________, 19___.


                                           Network Appliance, Inc.

                                           Name:
                                                 -------------------------------
                                           Title:
                                                  ------------------------------

[cc all Participants]




                                       2
<PAGE>   46
                                   Schedule 1

                               FINANCIAL COVENANTS

        This Schedule 1 is attached to and made a part of (a) the Lease
Agreement (Phase II - Improvements) (the "IMPROVEMENTS LEASE") dated to be
effective as of May 3, 1999 (the "EFFECTIVE DATE"), between BNP Leasing
Corporation, a Delaware corporation ("BNPLC") and Network Appliance, Inc., a
California corporation ("NAI"), (b) the Lease Agreement (Phase II - Land) (the
"LAND LEASE" and, together with the Improvements Lease, the "LEASES") dated to
be effective as of the Effective Date, between BNPLC and NAI, (c) the Pledge
Agreement (Phase II - Improvements) (the "PLEDGE AGREEMENT (IMPROVEMENTS)")
dated to be effective as of the Effective Date, among BNPLC, NAI, and Banque
Nationale de Paris, as a Participant and as agent for any financial institutions
that become Participants thereunder from time to time, and (d) the Pledge
Agreement (Phase II - Land) (collectively with the Pledge Agreement
(Improvements), the "PLEDGE AGREEMENTS") dated to be effective as of the
Effective Date, among BNPLC, NAI, and Banque Nationale de Paris, as a
Participant and as agent for any financial institutions that become Participants
thereunder from time to time.

                             PART I - DEFINED TERMS

        In this Schedule 1, capitalized terms used but not defined herein shall
have the meaning assigned to them in the Leases or the Common Definitions and
Provisions Agreements referenced in the Leases; and the following capitalized
terms shall have the following meanings:

"ADJUSTED NET INCOME" means, for any fiscal period of NAI, the aggregate net
income earned (or net losses incurred) during such period by NAI and its
Subsidiaries (determined on a consolidated basis), plus any Permitted Non-Cash
Charges deducted in determining such net income (or net loss).

"ADJUSTED EBIT" means, for any accounting period, net income (or net loss) of
NAI and its Subsidiaries (determined on a consolidated basis), plus the amounts
(if any) which, in the determination of net income (or net loss) for such
period, have been deducted for (a) interest expense, (b) income tax expense (c)
rent expense under leases of property, and (d) Permitted Non-Cash Charges.

"COLLATERAL TEST DATES" mean the Base Rent Commencement Date and the earlier of
the following dates after each fiscal quarter of NAI that ends after the Base
Rent Commencement Date : (1) the seventh Business Day after the release by NAI
of its financial statements for the fiscal quarter; or (2) the first Business
Day of the third calendar month following the end of the fiscal quarter.

"CONSOLIDATED TANGIBLE NET WORTH" means the excess of (1) the total assets,
other than Intangible Assets, of NAI and its Subsidiaries (determined on a
consolidated basis) over (2) the total liabilities of NAI and its Subsidiaries
(determined on a consolidated basis).

"DEBT" as used in this Exhibit shall have the meaning assigned to it in the
Common Definitions and Provisions Agreements, where "Debt" of any Person is
defined to mean (without duplication of any item): (a) indebtedness of such
Person for borrowed money; (b) indebtedness of such Person for the deferred
purchase price of property or services (except trade payables and accrued
expenses constituting current liabilities in the ordinary course of business);
(c) the face amount of any outstanding letters of credit issued for the account
of such Person; (d) obligations of such Person arising under acceptance
facilities; (e) guaranties, endorsements (other than for collection in the
ordinary course of business) and other contingent obligations of such Person to
purchase, to provide funds for payment, to provide funds to invest in any
Person, or otherwise to assure a creditor against loss; (f) obligations of
others secured by any Lien on property of such Person; (g) obligations of such
Person as lessee under Capital Leases; and (h) the obligations of such Person,
contingent or otherwise, under any lease of property or related documents
(including a separate purchase agreement) which provide that such Person or any
of its



                                       1
<PAGE>   47
Affiliates must purchase or cause another Person to purchase any interest in the
leased property and thereby guarantee a minimum residual value of the leased
property to the lessor. For purposes of this definition, the amount of the
obligations described in clause (h) of the preceding sentence with respect to
any lease classified according to GAAP as an "operating lease," shall equal the
sum of (1) the present value of rentals and other minimum lease payments
required in connection with such lease [calculated in accordance with SFAS 13
and other GAAP relevant to the determination of the whether such lease must be
accounted for as an operating lease or capital lease], plus (2) the fair value
of the property covered by the lease; provided, however, that such amount shall
not exceed the price, as of the date a determination of Debt is required
hereunder, for which the lessee can purchase the leased property pursuant to any
valid ongoing purchase option if, upon such a purchase, the lessee shall be
excused from paying rentals or other minimum lease payments that would otherwise
accrue after the purchase.

"FIXED CHARGES" means, for any accounting period, the sum (without duplication
of any item) of the following charges or costs incurred or paid by NAI and its
Subsidiaries (determined on a consolidated basis): (a) gross interest expense,
plus (b) amortization of principal or debt discount in respect of all Debt
during such period, plus (c) rent payable under all leases of property during
such period, plus (d) taxes payable during such period.

"INTANGIBLE ASSETS" means assets of NAI and its Subsidiaries (determined on a
consolidated basis) that are properly classified as "INTANGIBLE ASSETS" in
accordance with GAAP and, in any event, shall include goodwill, patents, trade
names, trademarks, copyrights, franchises, experimental expense, organization
expense, unamortized debt discount and expense, and deferred charges (other than
prepaid insurance, prepaid taxes and current deferred taxes to the extent any
such prepaid or deferred items are classified on the balance sheet of NAI and
its consolidated Subsidiaries as current assets in accordance with GAAP and with
the concurrence of NAI's independent public accountants).

"MANDATORY COLLATERAL PERIOD" means any period during which, notwithstanding any
contrary designation of a Collateral Percentage by NAI under the Pledge
Agreements, the Collateral Percentage for purposes of the Pledge Agreements
shall be one hundred percent (100%), determined as set forth in Part III of this
Schedule 1.

"PERMITTED NON-CASH CHARGES" means the amounts (if any) which, in the
determination of net income (or net loss) for any relevant fiscal period, have
been deducted by NAI or its Subsidiaries for non-cash charges made to write down
goodwill or research and development costs in connection with acquisitions
permitted by this Schedule 1.

"QUICK RATIO" means the ratio of:

               (A) the sum (without duplication of any item) of the following
        assets of NAI and its Subsidiaries (determined on a consolidated basis):
        Collateral delivered and pledged under the Pledge Agreements in
        accordance with the requirements thereof (if any); plus unencumbered
        cash; plus unencumbered short term cash investments; plus other
        unencumbered marketable securities which are classified as short term
        investments in accordance with GAAP; plus unencumbered accounts
        receivable, computed net of reserves for uncollectible amounts as
        determined in accordance with GAAP, to

               (B) the sum (without duplication of any item) of (1) all
        liabilities of NAI and its Subsidiaries (determined on a consolidated
        basis) treated as current liabilities in accordance with GAAP, plus (2)
        other obligations included in total Debt of NAI and its Subsidiaries
        (determined on a consolidated basis), the payment of which is due on
        demand or will become due within one year after the date on which the
        applicable determination of Quick Ratio is required hereunder.

"ROLLING FOUR QUARTER PERIOD" means a period of four consecutive fiscal quarters
of NAI, the last of which quarters ends after December 31, 1999.


                                       2
<PAGE>   48
                PART II - FINANCIAL COVENANTS FOR LEASE AGREEMENT

NAI covenants that it shall not at any time suffer or permit:

1. Minimum Unencumbered Cash and Cash Equivalents. The sum (without duplication
of any item) of the unrestricted cash, Collateral delivered and pledged under
the Pledge Agreements in accordance with the requirements thereof (if any),
unencumbered short term cash investments and unencumbered marketable securities
classified as short term investments according to GAAP of NAI and its
Subsidiaries (determined on a consolidated basis) to be less than total Debt of
NAI and its Subsidiaries (determined on a consolidated basis).

2. Minimum Tangible Net Worth. Consolidated Tangible Net Worth to be less than
the sum of: (a) ninety percent of the Consolidated Tangible Net Worth as of
October 30, 1998; plus (b) seventy-five percent of NAI's net income (computed
without deduction for net losses in any fiscal quarter) earned in each fiscal
quarter since October 30, 1998; plus (c) one-hundred percent of the net proceeds
of sales of stock in NAI or its Subsidiaries (other than sales to NAI or its
Subsidiaries) after October 30, 1998; less (d) Permitted Non-Cash Charges for
any period after October 30, 1998.

3. Minimum Quick Ratio. The Quick Ratio to be less than 1.50 to 1.00.

4. Minimum Fixed Charge Coverage. The ratio of (a) Adjusted EBIT for any Rolling
Four Quarter Period to (b) Fixed Charges for the same Rolling Four Quarter
Period, to be less than 1.50 to 1.00.

5. Minimum Profitability. Adjusted Net Income to be less than $1.00 in more than
one fiscal quarter of any Rolling Four Quarter Period.

6. Maximum Leverage Ratio. the ratio of (a) total Debt of NAI and its
Subsidiaries (determined on a consolidated basis) at the end of any Rolling Four
Quarter Period to (b) the Adjusted EBIT for the same Four Quarter Rolling
Period, to exceed 3.00 to 1.00.

                PART III - TESTS FOR MANDATORY COLLATERAL PERIODS

        The period commencing on any Collateral Test Date, and ending on the
next Collateral Test Date, shall constitute a Mandatory Collateral Period if, at
the end of the latest fiscal quarter of NAI ending before such period, NAI shall
have both:

        (A) failed to maintain a ratio of (1) the sum (without duplication of
any item) of Collateral delivered and pledged under the Pledge Agreements in
accordance with the requirements thereof (if any), unencumbered cash,
unencumbered short term cash investments and unencumbered marketable securities
classified as short term investments according to GAAP of NAI and its
Subsidiaries (determined on a consolidated basis) to (2) all Debt of NAI and its
Subsidiaries (determined on a consolidated basis), of at least 1.25 to 1.00
through and including the end of the last quarter of NAI's fiscal year 2000, and
of at least 1.50 to 1.00 thereafter; and.

        (B) failed to maintain a ratio of (i) all Debt of NAI and its
Subsidiaries (determined on a consolidated basis) to (ii) Consolidated Tangible
Net Worth of NAI, of no more than 0.45 to 1.00.

                            PART IV - OTHER COVENANTS

Without limiting NAI's obligations under the other provisions of the Operative
Documents, during the Term, NAI shall not, without the prior written consent of
BNPLC in each case:



                                       3
<PAGE>   49
A. Liens. Create, incur, assume or suffer to exist, or permit any of its
Consolidated Subsidiaries to create, incur, assume or suffer to exist, any Lien,
upon or with respect to any of its properties, now owned or hereafter acquired,
provided that the following shall be permitted except to the extent that they
would encumber any interest in the Property in violation of other provisions of
the Operative Documents:

1. Liens for taxes or assessments or other government charges or levies if not
yet due and payable or if they are being contested in good faith by appropriate
proceedings and for which appropriate reserves are maintained;

2. Liens imposed by law, such as mechanic's, materialmen's, landlord's,
warehousemen's and carrier's Liens, and other similar Liens, securing
obligations incurred in the ordinary course of business which are not past due
for more than thirty (30) days, or which are being contested in good faith by
appropriate proceedings and for which appropriate reserves have been
established;

3. Liens under workmen's compensation, unemployment insurance, social security
or similar laws (other than ERISA);

4. Liens, deposits or pledges to secure the performance of bids, tenders,
contracts (other than contracts for the payment of money), leases, public or
statutory obligations, surety, stay, appeal, indemnity, performance or other
similar bonds, or other similar obligations arising in the ordinary course of
business;

5. judgment and other similar Liens against assets other than the Property or
any part thereof in an aggregate amount not in excess of $3,000,000 arising in
connection with court proceedings; provided that the execution or other
enforcement of such Liens is effectively stayed and the claims secured thereby
are being actively contested in good faith by appropriate proceedings;

6. easements, rights-of-way, restrictions and other similar encumbrances which,
in the aggregate, do not materially interfere with the occupation, use and
enjoyment by NAI or any such Consolidated Subsidiary of the property or assets
encumbered thereby in the normal course of its business or materially impair the
value of the property subject thereto;

7. Liens securing obligations of such a Consolidated Subsidiary to NAI or to
another such Consolidated Subsidiary;

8. Liens not otherwise permitted by this subparagraph A (and not encumbering the
Property or any Collateral) incurred in connection with the incurrence of
additional Debt or asserted to secure Unfunded Benefit Liabilities, provided
that (a) the sum of the aggregate principal amount of all outstanding
obligations secured by Liens incurred pursuant to this clause shall not at any
time exceed five percent (5%) of Consolidated Tangible Net Worth at such time;
and (b) such Liens do not constitute Liens against NAI's interest in any
material Subsidiary or blanket Liens against all or substantially all of the
inventory, receivables, general intangibles or equipment of NAI or of any
material Subsidiary of NAI (for purposes of this clause, a "material Subsidiary"
means any subsidiary whose assets represent a substantial part of the total
assets of NAI and its Subsidiaries, determined on a consolidated basis in
accordance with GAAP); and

9. Liens incurred in connection with any renewals, extensions or refundings of
any Debt secured by Liens described in the preceding clauses of this
subparagraph A, provided that there is no increase in the aggregate principal
amount of Debt secured thereby from that which was outstanding as of the date of
such renewal, extension or refunding and no additional property is encumbered.

B. Transactions with Affiliates. Enter into or permit any Subsidiary of NAI to
enter into any material transactions (including, without limitation, the
purchase, sale or exchange of property or the rendering of any service) with any
Affiliates of NAI except on terms (1) that would not cause or result in a
Default by NAI under the financial covenants set forth in Part II of this
Schedule, and (2) that are no less favorable to NAI or the relevant Subsidiary
than those that would have been obtained in a comparable transaction on an arm's
length basis from an unrelated Person.



                                       4
<PAGE>   50
C. Compliance. Fail to preserve and maintain all licenses, permits, governmental
approvals, rights, privileges and franchises necessary for the conduct of its
business; or fail to comply with the provisions of all documents pursuant to
which NAI is organized and/or which govern NAI's continued existence and with
the requirements of all laws, rules, regulations and orders of a governmental
agency applicable to NAI and/or its business.

D. Insurance. Fail to maintain and keep in force insurance of the types and in
amounts customarily carried in lines of business similar to that of NAI,
including but not limited to fire, extended coverage, public liability, flood,
property damage and workers' compensation, with all such insurance carried with
companies and in amounts satisfactory to BNPLC, or fail to deliver to BNPLC from
time to time at BNPLC's request schedules setting forth all insurance then in
effect.

E. Facilities. fail to keep all properties useful or necessary to NAI's business
in good repair and condition, or to from time to time make necessary repairs,
renewals and replacements thereto so that such properties shall be fully and
efficiently preserved and maintained.

F. Taxes and Other Liabilities. Fail to pay and discharge when due any and all
indebtedness, obligations, assessments and taxes, both real or personal,
including without limitation federal and state income taxes and state and local
property taxes and assessments, except (a) such as NAI may in good faith contest
or as to which a bona fide dispute may arise, and (b) for which NAI has made
provisions, to BNPLC's satisfaction, for eventual payment thereof in the event
that NAI is obligated to make such payment.

G. Capital Expenditures. Make any additional investment in fixed assets in any
fiscal year in excess of an aggregate of $20,000,000.00.

H. Merger, Consolidation, Transfer of Assets. Merge into or consolidate with any
other entity (unless NAI is the surviving entity and remains in compliance of
all provisions of the Operative Documents); or make any substantial change in
the nature of NAI's business as conducted as of the date hereof; or sell, lease,
transfer or otherwise dispose of all or a substantial or material portion of
NAI's assets except in the ordinary course of its business.

I. Loans, Advances, Investments. Make any loans or advances to or investments in
any person or entity, except (a) any of the foregoing existing as of, and
disclosed to BNPLC prior to, the date hereof, (b) loans to employees for travel
advances, relocation loans and other loans in the ordinary course of business,
(c) investments in accordance with NAI's investment policy, as in effect from
time to time, (d) existing investments in subsidiaries and joint ventures which
have been disclosed to BNPLC in writing prior to the date hereof, and new
investments in subsidiaries and joint ventures in amounts up to an aggregated of
$10,000,000.00, (e) loans to employees, officers, directors to finance or
refinance the purchase of equity securities of NAI.

J. Dividends, Distributions. Declare or pay any dividend or distribution either
in cash, stock or any other property on NAI's stock now or hereafter
outstanding, nor redeem, retire, repurchase or otherwise acquire any shares of
any class of NAI's stock now or hereafter outstanding.



                                       5
<PAGE>   51
                   COMMON DEFINITIONS AND PROVISIONS AGREEMENT
                            (PHASE II - IMPROVEMENTS)


                                     BETWEEN



                             BNP LEASING CORPORATION

                                       AND

                             NETWORK APPLIANCE, INC.



                             DATED AS OF MAY 3, 1999




                                       1
<PAGE>   52
                                TABLE OF CONTENTS



                                                                                            Page
                                                                                            ----
                                                                                         
ARTICLE I - LIST OF DEFINED TERMS:

ABSOLUTE NAI CONSTRUCTION OBLIGATIONS ...............................................         1
ACTIVE NEGLIGENCE ...................................................................         2
ADDITIONAL RENT .....................................................................         3
ADMINISTRATIVE AGENCY FEE ...........................................................         3
ADJUSTED EBIT .......................................................................         3
ADVANCE DATE ........................................................................         3
AFFILIATE ...........................................................................         3
APPLICABLE LAWS .....................................................................         3
APPLICABLE PURCHASER ................................................................         3
ARRANGEMENT FEE .....................................................................         3
ATTORNEYS' FEES .....................................................................         3
BALANCE OF UNPAID CONSTRUCTION-PERIOD INDEMNITY PAYMENTS ............................         3
BANKING RULES CHANGE ................................................................         3
BASE RATE ...........................................................................         4
BASE RENT ...........................................................................         4
BASE RENT COMMENCEMENT DATE .........................................................         4
BASE RENT DATE ......................................................................         4
BASE RENT PERIOD ....................................................................         5
BNPLC ...............................................................................         5
BNPLC's PARENT ......................................................................         6
BREAKAGE COSTS ......................................................................         6
BREAK EVEN PRICE ....................................................................         6
BUSINESS DAY ........................................................................         6
CAPITAL ADEQUACY CHARGES ............................................................         6
CAPITAL LEASE .......................................................................         6
CARRYING COSTS ......................................................................         6
CLOSING CERTIFICATE .................................................................         6
CMA SUSPENSION EVENT ................................................................         7
CMA SUSPENSION NOTICE ...............................................................         7
CMA SUSPENSION PERIOD ...............................................................         7
CMA TERMINATION EVENT ...............................................................         7
CODE ................................................................................         7
COLLATERAL ..........................................................................         7
COLLATERAL PERCENTAGE ...............................................................         7
COMMITMENT FEE RATE .................................................................         7
COMMON DEFINITIONS AND PROVISIONS AGREEMENT (PHASE II - IMPROVEMENTS) ...............         8
COMPLETION NOTICE ...................................................................         8
CONSTRUCTION ADVANCES ...............................................................         8
CONSTRUCTION ADVANCE REQUEST ........................................................         8
CONSTRUCTION ALLOWANCE ..............................................................         8
CONSTRUCTION MANAGEMENT AGREEMENT ...................................................         8


<PAGE>   53



                                                                                            Page
                                                                                            ----
                                                                                         
CONSTRUCTION MILESTONE ..............................................................         9
CONSTRUCTION PERIOD .................................................................         9
CONSTRUCTION-PERIOD INDEMNITY PAYMENTS ..............................................         9
CONSTRUCTION PROJECT ................................................................         9
CURRENT AS IS MARKET VALUE ..........................................................         9
DEBT ................................................................................        10
DEFAULT .............................................................................        10
DEFAULT RATE ........................................................................        10
DEFAULTING PARTICIPANT ..............................................................        10
DEFECTIVE WORK ......................................................................        10
DEPOSIT TAKER .......................................................................        11
DEPOSIT TAKER LOSSES ................................................................        11
DESIGNATED SALE DATE ................................................................        11
DEVELOPMENT DOCUMENTS ...............................................................        11
DIRECT PAYMENTS TO PARTICIPANTS .....................................................        11
EFFECTIVE DATE ......................................................................        12
EFFECTIVE RATE ......................................................................        12
ENVIRONMENTAL LAWS ..................................................................        12
ENVIRONMENTAL CUTOFF DATE ...........................................................        12
ENVIRONMENTAL LOSSES ................................................................        12
ENVIRONMENTAL REPORTS ...............................................................        13
ERISA ...............................................................................        13
ERISA AFFILIATE .....................................................................        13
ESCROWED PROCEEDS ...................................................................        13
ESTABLISHED MISCONDUCT ..............................................................        13
EUROCURRENCY LIABILITIES ............................................................        14
EURODOLLAR RATE RESERVE PERCENTAGE ..................................................        14
EVENT OF DEFAULT ....................................................................        14
EXCLUDED TAXES ......................................................................        14
EXISTING CONTRACT ...................................................................        14
EXISTING SPACE LEASES ...............................................................        15
FAILED COLLATERAL TEST DATE .........................................................        15
FED FUNDS RATE ......................................................................        15
FOCB NOTICE .........................................................................        15
FUNDED CONSTRUCTION ALLOWANCE .......................................................        15
FUNDING ADVANCES ....................................................................        15
FUTURE WORK .........................................................................        15
GAAP ................................................................................        15
HAZARDOUS SUBSTANCE .................................................................        15
HAZARDOUS SUBSTANCE ACTIVITY ........................................................        16
IMPOSITIONS .........................................................................        16
IMPROVEMENTS ........................................................................        16
IMPROVEMENTS LEASE ..................................................................        16
INITIAL FUNDING ADVANCE .............................................................        16
INTERESTED PARTY ....................................................................        17
ISSUE 97-1 NON-PERFORMANCE-RELATED SUBJECTIVE EVENT OF DEFAULT ......................        17
ISSUE 97-10 ELECTION ................................................................        17


<PAGE>   54



                                                                                            Page
                                                                                            ----
                                                                                         
ISSUE 97-10 PREPAYMENT ..............................................................        17
LAND ................................................................................        18
LANDLORD'S ELECTION TO CONTINUE CONSTRUCTION ........................................        18
LIBOR ...............................................................................        18
LIBOR PERIOD ELECTION ...............................................................        18
LIEN ................................................................................        19
LIENS REMOVABLE BY BNPLC ............................................................        19
LOSSES ..............................................................................        19
MANDATORY COLLATERAL PERIOD .........................................................        19
MATERIAL ENVIRONMENTAL COMMUNICATION ................................................        20
MAXIMUM CONSTRUCTION ALLOWANCE ......................................................        20
MAXIMUM PERMITTED TERMINATION FEES ..................................................        20
MAXIMUM PERMITTED PREPAYMENT ........................................................        20
MAXIMUM REMARKETING OBLIGATION ......................................................        20
MINIMUM EXTENDED REMARKETING PRICE ..................................................        20
MULTIEMPLOYER PLAN ..................................................................        20
NAI .................................................................................        20
NAI'S EXTENDED REMARKETING PERIOD ...................................................        20
NAI'S EXTENDED REMARKETING RIGHT ....................................................        20
NAI'S INITIAL REMARKETING RIGHTS AND OBLIGATIONS ....................................        20
NORMAL TENANT IMPROVEMENTS ..........................................................        21
NOTICE OF NAI'S INTENT TO TERMINATE .................................................        21
OPERATIVE DOCUMENTS .................................................................        21
OTHER COMMON DEFINITIONS AND PROVISIONS AGREEMENT ...................................        21
OTHER LEASE AGREEMENT ...............................................................        21
OTHER PURCHASE AGREEMENT ............................................................        21
OUTSTANDING CONSTRUCTION ALLOWANCE ..................................................        21
PARTICIPANT .........................................................................        21
PARTICIPATION AGREEMENT .............................................................        21
PBGC ................................................................................        22
PERIOD ..............................................................................        22
PERMITTED ENCUMBRANCES ..............................................................        22
PERMITTED HAZARDOUS SUBSTANCE USE ...................................................        22
PERMITTED HAZARDOUS SUBSTANCES ......................................................        22
PERMITTED TRANSFER ..................................................................        22
PERSON ..............................................................................        23
PERSONAL PROPERTY ...................................................................        23
PLAN ................................................................................        23
PLEDGE AGREEMENT ....................................................................        23
PRE-COMMENCEMENT CASUALTY ...........................................................        23
PREEMPTIVE NOTICE ...................................................................        23
PRIME RATE ..........................................................................        23
PRIOR WORK ..........................................................................        24
PROJECT COSTS .......................................................................        24
PROJECTED COST OVERRUNS .............................................................        25
PROPERTY ............................................................................        25
PURCHASE AGREEMENT ..................................................................        25


<PAGE>   55



                                                                                            Page
                                                                                            ----
                                                                                         
PURCHASE DOCUMENTS ..................................................................        25
PURCHASE OPTION .....................................................................        25
QUALIFIED AFFILIATE .................................................................        25
QUALIFIED PREPAYMENTS ...............................................................        25
REAL PROPERTY .......................................................................        26
REIMBURSABLE CONSTRUCTION-PERIOD COSTS ..............................................        26
REMEDIAL WORK .......................................................................        26
RENT ................................................................................        26
RESIDUAL RISK PERCENTAGE ............................................................        26
RESPONSIBLE FINANCIAL OFFICER .......................................................        26
SALE CLOSING DOCUMENTS ..............................................................        26
SCOPE CHANGE ........................................................................        26
SECURED SPREAD ......................................................................        26
SELLER ..............................................................................        26
STIPULATED LOSS VALUE ...............................................................        26
SUBSIDIARY ..........................................................................        26
SUPPLEMENTAL PAYMENT ................................................................        27
TERM ................................................................................        27
THIRD PARTY CONTRACT ................................................................        27
THIRD PARTY PRICE ...................................................................        27
THIRD PARTY SALE NOTICE .............................................................        27
THIRD PARTY SALE PROPOSAL ...........................................................        27
THIRD PARTY TARGET PRICE ............................................................        27
TRANSACTION EXPENSES ................................................................        27
UNFUNDED BENEFIT LIABILITIES ........................................................        27
UPFRONT SYNDICATION FEES ............................................................        27
UNSECURED SPREAD ....................................................................        27
VOLUNTARY NAI CONSTRUCTION CONTRIBUTIONS ............................................        28
VOLUNTARY RETENTION OF THE PROPERTY .................................................        28
WORK ................................................................................        28

ARTICLE II - PROVISIONS USED IN COMMON:

 1   NOTICES ........................................................................        29
 2   SEVERABILITY ...................................................................        30
 3   NO MERGER ......................................................................        30
 4   NO IMPLIED WAIVER ..............................................................        31
 5   ENTIRE AND ONLY AGREEMENTS .....................................................        31
 6   BINDING EFFECT .................................................................        31
 7   TIME IS OF THE ESSENCE .........................................................        31
 8   GOVERNING LAW ..................................................................        31
 9   PARAGRAPH HEADINGS .............................................................        31
 10  NEGOTIATED DOCUMENTS ...........................................................        32
 11  TERMS NOT EXPRESSLY DEFINED IN AN OPERATIVE DOCUMENT ...........................        32
 12  OTHER TERMS AND REFERENCES .....................................................        32



<PAGE>   56



                                                                                            Page
                                                                                            ----
                                                                                         
 13  EXECUTION IN COUNTERPARTS ......................................................        32
 14  NOT A PARTNERSHIP, ETC .........................................................        32


<PAGE>   57
                   COMMON DEFINITIONS AND PROVISIONS AGREEMENT
                            (PHASE II - IMPROVEMENTS)

        This Common Definitions and Provisions Agreement (Phase II -
Improvements), by and between BNP LEASING CORPORATION, a Delaware corporation
("BNPLC"), and NETWORK APPLIANCE, INC., a California corporation ("NAI"), is
dated as of May 3, 1999, the Effective Date.

                                    RECITALS

        Contemporaneously with the execution of this Common Definitions and
Provisions Agreement (Phase II - Improvements), NAI is executing the Closing
Certificate (as defined below) in favor of BNPLC, and BNPLC and NAI are
executing the Improvements Lease (as defined below), the Construction Management
Agreement (as defined below), and the Purchase Agreement (as defined below), all
of which concern the Property (as defined below). Each of the Closing
Certificate, the Improvements Lease, the Construction Management Agreement and
the Purchase Agreement (together with this Common Definitions and Provisions
Agreement (Phase II - Improvements) and the Pledge Agreement [as defined below],
the "OPERATIVE DOCUMENTS") are intended to create separate and independent
obligations upon the parties thereto. However, NAI and BNPLC intend that all of
the Operative Documents share certain consistent definitions and other
miscellaneous provisions. To that end, the parties are executing this Common
Definitions and Provisions Agreement (Phase II - Improvements) and incorporating
it by reference into each of the other Operative Documents.

                                   AGREEMENTS

                       ARTICLE I - LIST OF DEFINED TERMS

        UNLESS A CLEAR CONTRARY INTENTION APPEARS, THE FOLLOWING TERMS SHALL
HAVE THE RESPECTIVE INDICATED MEANINGS AS USED HEREIN AND IN THE OTHER OPERATIVE
DOCUMENTS:

        "ABSOLUTE NAI CONSTRUCTION OBLIGATIONS" means the following:

        (1) Construction-Period Indemnity Payments required because of or in
    connection with or arising out of Environmental Losses incurred or suffered
    by any Interested Party;

        (2) Construction-Period Indemnity Payments required because of or in
    connection with or arising out of Losses incurred or suffered by BNPLC that
    BNPLC would not have incurred or suffered but for any act or any omission of
    NAI or of any NAI's contractors or subcontractors during the period that the
    Construction Management Agreement remains in force or during any other
    period that NAI remains in possession or control of the Construction Project
    (excluding, however, as described below certain Losses consisting of claims
    related to any failure by NAI to complete the Construction Project);

        (3) Construction-Period Indemnity Payments required because of or in
    connection with or arising out of Losses incurred or suffered by BNPLC that
    would not have been incurred but for any fraud, misapplication of funds
    (including

Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 1
<PAGE>   58

    Construction Advances), illegal acts, or willful misconduct on the part of
    the NAI or its employees or agents or any other party for whom NAI is
    responsible; and

        (4) Construction-Period Indemnity Payments required because of or in
    connection with or arising out of Losses incurred or suffered by BNPLC that
    would not have been incurred but for any bankruptcy proceeding involving
    NAI.

For purposes of clause (2) of this definition, "acts and omissions of NAI" shall
include (i) any decision by NAI to make a Scope Change without the prior
approval of BNPLC, (ii) any failure of NAI to maintain insurance required by the
Improvements Lease or the Construction Management Agreement, (iii) any decision
not to continue or complete Work under the Construction Management Agreement
because of a change in NAI's facility needs or in NAI's plans to meet its
facility needs (such as, for example, a decision by NAI to lease or acquire
another less expensive facility as an alternative to the Improvements), (iv) any
failure by NAI to reserve termination rights in Third Party Contracts as
required by subparagraph 1(A)(2)(b) of the Construction Management Agreement,
and (v) any other breach by NAI of the Construction Management Agreement.

Thus, for example, if a third party asserts a claim for damages against BNPLC
because of injuries the third party sustained while on the Land as a result of
NAI's breach of its obligation under the Construction Management Agreement to
keep the Land and the Improvements thereon in a reasonably safe condition as
Work progresses under NAI's direction and control, then any Construction-Period
Indemnity Payment required because of such third party claim will constitute an
Absolute NAI Construction Obligation under clause (2) of this definition.
Similarly, if a claim against BNPLC by a third party injured on the Land during
the progress of the Work is uninsured or under-insured only because of NAI's
failure to obtain liability insurance in accordance with the requirements of the
Improvements Lease (the premiums for which insurance are reimbursable from
Construction Advances as provided in the Construction Management Agreement),
then Construction-Period Indemnity Payments to BNPLC for the uninsured or
under-insured Losses arising out of the third party claim will constitute
Absolute NAI Construction Obligations under clause (2) of this definition.

It is understood, however, that a failure of NAI to complete construction of the
Construction Project will not necessarily constitute a breach of the
Construction Management Agreement, given that NAI may elect to terminate the
Construction Management Agreement as provided in subparagraph 5(D) thereof. In
the event the Construction Management Agreement is terminated by NAI pursuant to
subparagraph 5(D) thereof or by BNPLC pursuant to subparagraph 5(E) thereof,
clause (2) of this definition will not be construed to include
Construction-Period Indemnity Payments, the sole reason for which are Losses
suffered by BNPLC consisting of claims related to NAI's failure to complete the
Construction Project.

        "ACTIVE NEGLIGENCE" of any Person (including BNPLC) means, and is
limited to, the negligent conduct on the Property (and not mere omissions) by
such Person or by others acting and authorized to act on such Person's behalf in
a manner that proximately causes actual bodily injury or property damage for
which NAI does not carry (and is not obligated by the Improvements Lease to
carry) insurance. "ACTIVE NEGLIGENCE" shall not include (1) any negligent
failure of BNPLC to act when the duty to act would not have been imposed but for
BNPLC's status as owner of the Land, the Improvements or any interest in any
other Property or as a party to the transactions described in the Improvements
Lease or the other Operative Documents or in the Other Lease Agreement or the
Other Purchase Agreement, (2) any negligent failure of any other Interested
Party to act when the duty to act would not have been imposed but for such
party's contractual or other relationship to BNPLC or participation or
facilitation in any manner, directly or indirectly, of the transactions
described in the Improvements Lease or other Operative Documents or in the Other
Lease Agreement or Other Purchase Agreement, or (3) the exercise in a lawful
manner by BNPLC (or any party lawfully claiming through or under BNPLC) of any
right or remedy provided in or under the Improvements Lease or the other
Operative Documents or in the Other Lease Agreement or Other Purchase Agreement.

        "ADDITIONAL RENT" shall have the meaning assigned to it in subparagraph
of the Improvements Lease.

 Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 2
<PAGE>   59

        "ADMINISTRATIVE AGENCY FEE" shall have the meaning assigned to it in
subparagraph 9 of the Improvements Lease.

        "ADJUSTED EBIT" shall have the meaning assigned to it in Part I of
Schedule 1 attached to the Improvements Lease and to the Pledge Agreement.

        "ADVANCE DATE" means, regardless of whether any Construction Advance
shall actually be made thereon, the first Business Day of every calendar month,
beginning with the first Business Day in May, 1999 and continuing regularly
thereafter to and including the Base Rent Commencement Date.

        "AFFILIATE" of any Person means any other Person controlling,
controlled by or under common control with such Person. For purposes of this
definition, the term "control" when used with respect to any Person means the
power to direct the management of policies of such Person, directly or
indirectly, whether through the ownership of voting securities, by contract or
otherwise, and the terms "controlling" and "controlled" have meanings
correlative to the foregoing.

        "APPLICABLE LAWS" means any or all of the following, to the extent
applicable to NAI or the Property or the Improvements Lease or the other
Operative Documents: restrictive covenants; zoning ordinances and building
codes; flood disaster laws; health, safety and environmental laws and
regulations; the Americans with Disabilities Act and other laws pertaining to
disabled persons; and other laws, statutes, ordinances, rules, permits,
regulations, orders, determinations and court decisions.

        "APPLICABLE PURCHASER" means any third party designated by NAI to
purchase BNPLC's interest in the Property and in any Escrowed Proceeds as
provided in the Purchase Agreement.

        "ARRANGEMENT FEE" shall have the meaning assigned to it in subparagraph
3.(e) of the Improvements Lease.

        "ATTORNEYS' FEES" means the expenses and reasonable fees of counsel to
the parties incurring the same, excluding costs or expenses of in-house counsel
(whether or not accounted for as general overhead or administrative expenses),
but otherwise including printing, photostating, duplicating and other expenses,
air freight charges, and fees billed for law clerks, paralegals, librarians and
others not admitted to the bar but performing services under the supervision of
an attorney. Such terms shall also include all such fees and expenses incurred
with respect to appeals, arbitrations and bankruptcy proceedings, and whether or
not any manner of proceeding is brought with respect to the matter for which
such fees and expenses were incurred.

        "BALANCE OF UNPAID CONSTRUCTION-PERIOD INDEMNITY PAYMENTS" shall have
the meaning assigned to it in subparagraph 1(B)(1) of the Purchase Agreement.

        "BANKING RULES CHANGE" means either: (1) the introduction of or any
change in any law or regulation applicable to BNPLC, BNPLC's Parent or any other
Participant, or in the generally accepted interpretation by the institutional
lending community of any such law or regulation, or in the interpretation of any
such law or regulation asserted by any regulator, court or other governmental
authority (other than any change by way of imposition or increase of reserve
requirements included in the Eurodollar Rate Reserve Percentage) or (2) the
compliance by BNPLC, BNPLC's Parent or any other Participant with any new
guideline or new request from any central bank or other governmental authority
(whether or not having the force of law).

 Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 3
<PAGE>   60

        "BASE RATE" for any Construction Period or Base Rent Period means a
rate equal to the higher of (1) the Prime Rate in effect on the first day of
such period, or (2) the rate which is fifty basis points (50/100 of 1%) above
the Fed Funds Rate for that period.

        "BASE RENT" means the rent payable by NAI pursuant to subparagraph 3.(a)
of the Improvements Lease.

        "BASE RENT COMMENCEMENT DATE" means the earlier of (1) the first
Business Day of July, 2000, (2) the first Business Day of the first calendar
month to follow by twenty days or more the day upon which any Completion Notice
is given, or (3) the first Business Day of the first calendar month upon which
the Funded Construction Allowance shall equal or exceed the Maximum Construction
Allowance. For example, if on the first Business Day of November, 1999
construction of the Construction Project is continuing, the Funded Construction
Allowance is $18,990,000 (before adding any Carrying Costs for the preceding
month) and the Maximum Construction Allowance is $19,000,000, and if Carrying
Costs of $17,500 would be added to the Funded Construction Allowance on such day
if the Construction Allowance were not limited to the Maximum Construction
Allowance, then (absent an extension by BNPLC as described below) such day shall
be the Base Rent Commencement Date and on such day $10,000 will be added to the
Funded Construction Allowance as Carrying Cost and $7,500 will be payable as
Base Rent pursuant to subparagraph 3.(c)(i) of the Improvements Lease.
Notwithstanding the forgoing, if for any reason (including a termination of the
Construction Management Agreement) NAI has not completed the Construction
Project thirty days in advance of the scheduled Base Rent Commencement Date
determined pursuant to the first sentence of this definition, BNPLC shall be
entitled (but not obligated) to extend the Base Rent Commencement Date one or
more times and at any time before the Construction Project actually is complete
and ready for occupancy. To so extend the Base Rent Commencement Date, BNPLC
shall notify NAI thereof and of the date to which the Base Rent Commencement
Date is extended, which may be the first Business Day of any calendar month
designated by BNPLC in the notice of extension, provided that BNPLC will not so
designate any date more than sixty days after the date upon which the
Construction Project is expected by BNPLC (at the time of the designation) to be
complete.

        "BASE RENT DATE" means a date upon which Base Rent must be paid under
the Improvements Lease, all of which dates shall be the first Business Day of a
calendar month. The first Base Rent Date shall be determined as follows:

               a) If a LIBOR Period Election of one month is in effect on the
           Base Rent Commencement Date, then the first Business Day of the first
           calendar month following the Base Rent Commencement Date shall be the
           first Base Rent Date.

               b) If the LIBOR Period Election in effect on the Base Rent
           Commencement Date is three months or six months, then the first
           Business Day of the third calendar month following the Base Rent
           Commencement Date shall be the first Base Rent Date.

Each successive Base Rent Date after the first Base Rent Date shall be the first
Business Day of the first or third calendar month following the calendar month
which includes the preceding Base Rent Date, determined as follows:

               (1) If a LIBOR Period Election of one month is in effect on a
           Base Rent Date, then the first Business Day of the first calendar
           month following such Base Rent Date shall be the next following Base
           Rent Date.

               (2) If a LIBOR Period Election of three months or six months is
           in effect on a Base Rent Date, then the first Business Day of the
           third calendar month following such Base Rent Date shall be the next
           following Base Rent Date.

 Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 4
<PAGE>   61

Thus, for example, if the Base Rent Commencement Date falls on the first
Business Day of September, 1999 and a LIBOR Period Election of two months
commences on the Base Rent Commencement Date, then the first Base Rent Date
shall be the first Business Day of November, 1999.

        "BASE RENT PERIOD" means a period for which Base Rent must be paid
under the Improvements Lease, each of which periods shall correspond to the
LIBOR Period Election for such period. The first Base Rent Period shall begin on
and include the Base Rent Commencement Date, and each successive Base Rent
Period shall begin on and include the Base Rent Date upon which the preceding
Base Rent Period ends. Each Base Rent Period, including the first Base Rent
Period, shall end on but not include the first or second Base Rent Date after
the Base Rent Date upon which such period began, determined as follows:

               (1) If the LIBOR Period Election for a Base Rent Period is one
           month or three months, then such Base Rent Period shall end on the
           first Base Rent Date after the Base Rent Date upon which such period
           began.

               (2) If the LIBOR Period Election for a Base Rent Period is six
           months, then such Base Rent Period shall end on the second Base Rent
           Date after the Base Rent Date upon which such period began.

The determination of Base Rent Periods can be illustrated by two examples:

               1) If NAI makes a LIBOR Period Election of three months for a
           hypothetical Base Rent Period beginning on the first Business Day in
           January, 2001, then such Base Rent Period will end on but not include
           the first Base Rent Date after it begins; that is, such Base Rent
           Period will end on the first Business Day in April, 2001, the third
           calendar month after January, 2001.

               2) If, however, NAI makes a LIBOR Period Election of six months
           for the hypothetical Base Rent Period beginning the first Business
           Day in January, 2001, then such Base Rent Period will end on but not
           include the second Base Rent Date after it begins; that is, the first
           Business Day in July, 2001.

        "BNPLC" means BNP Leasing Corporation, a Delaware corporation.

        "BNPLC's PARENT" means BNPLC's Affiliate, Banque Nationale de Paris, a
bank organized and existing under the laws of France and any successors of such
bank.

        "BREAKAGE COSTS" means any and all costs, losses or expenses incurred
or sustained by BNPLC's Parent (as a Participant or otherwise) or any other
Participant, for which BNPLC's Parent or the Participant shall request
reimbursement from BNPLC, because of the resulting liquidation or redeployment
of deposits or other funds:

        (1) used to make or maintain Funding Advances upon application of a
    Qualified Prepayment or upon any sale of the Property pursuant to the
    Purchase Agreement, if such application or sale occurs on any day other than
    the last day of a Construction Period or Base Rent Period; or

        (2) reserved to provide a Construction Advance that NAI requests, but
    thereafter declines to take for any reason, or that NAI requests but is not
    permitted to take because of its failure to satisfy any of the conditions
    specified in the Construction Management Agreement; or

 Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 5
<PAGE>   62

        (3) used to make or maintain Funding Advances upon the acceleration of
    the end of any Base Rent Period pursuant subparagraph 3.(c)(iii) of the
    Improvements Lease.

Breakage Costs will include, for example, losses attributable to any decline in
LIBOR as of the effective date of any application described in the clause (1)
preceding, as compared to LIBOR used to determine the Effective Rate then in
effect. Each determination by BNPLC's Parent or the applicable Participant of
Breakage Costs shall, in the absence of clear and demonstrable error, be
conclusive and binding upon NAI.

        "BREAK EVEN PRICE" shall have the meaning assigned to it in
subparagraph 1(B)(1) of the Purchase Agreement.

        "BUSINESS DAY" means any day that is (1) not a Saturday, Sunday or day
on which commercial banks are generally closed or required to be closed in New
York City, New York or San Francisco, California, and (2) a day on which
dealings in deposits of dollars are transacted in the London interbank market;
provided that if such dealings are suspended indefinitely for any reason,
"Business Day" shall mean any day described in clause (1).

        "CAPITAL ADEQUACY CHARGES" means any additional amounts BNPLC's Parent
or any other Participant requests BNPLC to pay as compensation for an increase
in required capital as provided in subparagraph 5.(b)(ii) of the Improvements
Lease.

        "CAPITAL LEASE" means any lease which has been or should be capitalized
on the books of the lessee in accordance with GAAP or for federal income tax
purposes.

        "CARRYING COSTS" means the charges added to and made a part of the
Outstanding Construction Allowance (and thus also added to and made a part of
the Funded Construction Allowance) from time to time on and before the Base Rent
Commencement Date pursuant to and as more particularly described in subparagraph
6.(a) of the Improvements Lease.

        "CLOSING CERTIFICATE" means the Closing Certificate and Agreement dated
as of May 3, 1999 executed by NAI in favor of BNPLC, as such Closing Certificate
may be extended, supplemented, amended, restated or otherwise modified from time
to time in accordance with its terms.

        "CMA SUSPENSION EVENT" shall have the meaning assigned to it in
subparagraph 5(A) of the Construction Management Agreement.

        "CMA SUSPENSION NOTICE" shall have the meaning assigned to it in
subparagraph 5(B)(1) of the Construction Management Agreement.

        "CMA SUSPENSION PERIOD" shall have the meaning assigned to it in
subparagraph 5(C) of the Construction Management Agreement.

        "CMA TERMINATION EVENT" shall have the meaning assigned to it in
subparagraph 5(B)(3) of the Construction Management Agreement.

        "CODE" means the Internal Revenue Code of 1986, as amended.

        "COLLATERAL" shall have the meaning assigned to it in the Pledge
Agreement.

 Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 6
<PAGE>   63

        "COLLATERAL PERCENTAGE" for each Base Rent Period means the Collateral
Percentage for such period determined under (and as defined in) the Pledge
Agreement; provided, however, for purposes of the Improvements Lease, the
Collateral Percentage for any Base Rent Period shall not exceed a fraction; the
numerator of which fraction shall equal the value (determined as provided in the
Pledge Agreement) of all Collateral (a) that is, on the first day of such
period, held by the Deposit Takers under (and as defined in) the Pledge
Agreement subject to a Qualifying Security Interest (as defined below), (b) that
is free from claims or security interests held or asserted by any third party,
and (c) that is not in excess of Stipulated Loss Value; and the denominator of
which fraction shall equal the Stipulated Loss Value on the first day of such
period. "QUALIFYING SECURITY INTEREST" means a first priority perfected security
interest under the Pledge Agreement.

       "COMMITMENT FEE RATE" means, for each Construction Period, the amount
established as described below in this definition on the date (in this
definition, the "CFR TEST DATE") that is two Business Days prior to such
Construction Period by reference to the ratio calculated be dividing (1)
Adjusted EBIT for the then latest Rolling Four Quarters Period that ended prior
to (and for which NAI has reported earnings as necessary to compute Adjusted
EBIT) into (2) the total Debt of NAI and its Subsidiaries (determined on a
consolidated basis) as of the end of such Rolling Four Quarters Period. The
Commitment Fee Rate shall be established at the Level in the pricing grid below
which corresponds to such ratio; provided, that:

        (a) for any Construction Period commencing on or prior to the first
    Business Day of June, 1999, the Commitment Fee Rate will be the amount
    indicated for Level II in the pricing grid below;

        (b) promptly after earnings are reported by NAI for the latest quarter
    in any Rolling Four Quarters Period, NAI must notify BNPLC of any resulting
    change in the Commitment Fee Rate under this definition, and no reduction in
    the Commitment Fee Rate from one period to the next will be effective for
    purposes of the Operative Documents unless, prior to the CFR Test Date for
    the next period, NAI shall have provided BNPLC with a written notice setting
    forth and certifying the calculation under this definition that justifies
    the reduction; and

        (c) notwithstanding anything to the contrary in this definition, on any
    date when an Event of Default has occurred and is continuing, the Commitment
    Fee Rate shall equal the amount indicated for Level V in the pricing grid
    below.



                                  RATIO OF TOTAL DEBT                        COMMITMENT
         LEVELS                     TO ADJUSTED EBIT                          FEE RATE
     --------------       -------------------------------------           -----------------
                                                                    
        Level I                      less than 0.50                       25.0 basis points

        Level II           greater than or equal to 0.50, but             25.0 basis points
                                     less than 1.0

       Level III           greater than or equal to 1.0, but              32.5 basis points
                                     less than 1.5

        Level IV           greater than or equal to 1.5, but              50.0 basis points
                                     less than 2.0

        Level V               greater than or equal to 2.0                50.0 basis points


All determinations of the Commitment Fee Rate by BNPLC shall, in the absence of
clear and demonstrable error, be binding and conclusive for purposes of the
Improvements Lease. Further BNPLC may, but shall not be required, to rely on the
determination of the Commitment Fee Rate set forth in any notice delivered by
NAI as described above in clause (b) of this definition.

 Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 7
<PAGE>   64

        "COMMON DEFINITIONS AND PROVISIONS AGREEMENT (PHASE II - IMPROVEMENTS)"
means this Agreement, which is incorporated by reference into each of the other
Operative Documents.

        "COMPLETION NOTICE" means (1) a notice required by subparagraph 1(B) of
the Construction Management Agreement from NAI to BNPLC, advising BNPLC when
construction of the Construction Project is substantially complete, or (2) a
notice permitted by subparagraph 6.(g) of the Improvements Lease from BNPLC to
NAI, advising NAI after any Landlord's Election to Complete Construction when
construction of the Construction Project is substantially complete or that BNPLC
no longer intends to continue such construction.

        "CONSTRUCTION ADVANCES" means (1) actual advances of funds made by or
on behalf of BNPLC to or on behalf of NAI pursuant to Paragraph 2 of the
Construction Management Agreement, and (2) amounts considered as Construction
Advances pursuant to subparagraph 6.(e) of the Improvements Lease.

        "CONSTRUCTION ADVANCE REQUEST" shall have the meaning assigned to it in
subparagraph 2(C)(1) of the Construction Management Agreement.

        "CONSTRUCTION ALLOWANCE" means the allowance, consisting of
Construction Advances and Carrying Costs, which is to be provided for the
Construction Project as more particularly described in the Construction
Management Agreement and Paragraph 6 of the Improvements Lease.

        "CONSTRUCTION MANAGEMENT AGREEMENT" means the Construction Management
Agreement dated as of May 3, 1999 between BNPLC and NAI, as such Management
Agreement may be extended, supplemented, amended, restated or otherwise modified
from time to time in accordance with its terms.

        "CONSTRUCTION MILESTONE" shall have the meaning assigned to it in
subparagraph 5(B)(2) of the Construction Management Agreement.

        "CONSTRUCTION PERIOD" means each successive period of approximately one
month, with the first Construction Period beginning on and including the
Effective Date and ending on but not including the first Advance Date. Each
successive Construction Period after the first Construction Period shall begin
on and include the day on which the preceding Construction Period ends and shall
end on but not include the next following Advance Date, until the last
Construction Period, which shall end on but not include the earlier of the Base
Rent Commencement Date or any Designated Sale Date upon which NAI or any
Applicable Purchaser shall purchase BNPLC's interest in the Property pursuant to
the Purchase Agreement.

        "CONSTRUCTION-PERIOD INDEMNITY PAYMENTS" shall have the meaning
assigned to it in subparagraph 5.(d)(ii) of the Improvements Lease.

        "CONSTRUCTION PROJECT" means the new buildings or other substantial
Improvements to be constructed, or the alteration of existing Improvements, as
described generally in Exhibit B attached to the Construction Management
Agreement.

        "CURRENT AS IS MARKET VALUE" means an amount equal to the fair market
value of BNPLC's interest in the Property (or any applicable portion thereof),
AS IS, WHERE IS AND WITH ALL FAULTS on the date in question. Whenever a
determination of Current AS IS Market Value is required by the express terms of
any Operative Document, it will be determined accordance with the following
procedure unless BNPLC and NAI have otherwise agreed in writing upon a Current
AS IS Market Value at that time:


 Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 8
<PAGE>   65

        (A)     BNPLC and NAI shall each, within ten days after written notice
                from either to the other, select an appraiser. If either BNPLC
                or NAI fails to select an appraiser within the required period,
                then the appraiser who has been timely selected shall
                conclusively determine the fair market value of the Property (or
                applicable portion thereof) in accordance with this definition
                within forty-five days after his or her selection.

        (B)     Upon the selection of the two appraisers as provided above, such
                appraisers shall proceed to determine the fair market value of
                BNPLC's interest in the Property (or applicable portion thereof)
                in accordance with this clause (v). Such appraisals shall be
                submitted in writing no later than forty-five days after
                selection of the second appraiser. If the fair market value as
                determined by such appraisers is identical, such sum shall be
                Current AS IS Market Value. If the fair market value indicated
                by the lower appraisal differs from the fair market value
                indicated by the higher appraisal by less than five percent (5%)
                of the fair market value indicated by the higher appraisal, then
                Current AS IS Market Value shall be the sum of the two appraisal
                figures divided by two (2). If either appraiser fails to timely
                submit his or her appraisal, the timely submitted appraisal
                shall be determinative of Current AS IS Market Value.

        (C)     If the fair market value indicated by the lower appraisal
                differs from the fair market value indicated by the higher
                appraisal by more than five percent (5%) of the fair market
                value indicated by the higher appraisal, then the two appraisers
                previously selected shall select a third appraiser. The name of
                such appraiser shall be submitted at the same time the written
                appraisals are due. Such third appraiser shall then review the
                previously submitted appraisals and select the one that, in his
                professional opinion, more closely reflects the fair market
                value of BNPLC's interest in the Property (or applicable portion
                thereof), such selection to be submitted in writing no later
                than ten days after selection of the third appraiser. Such
                selection shall be determinative of Current AS IS Market Value.

        (D)     In making any such determination of fair market value, the
                appraisers shall assume that any improvements then located on
                the Property (or applicable portion thereof) or under
                construction thereon constitute the highest and best use, and
                that neither the Improvements Lease nor the Purchase Agreement
                add any value to the Property. Each appraiser selected hereunder
                shall be an independent MAI-designated appraiser with not less
                than ten years' experience in commercial real estate appraisal
                in Sunnyvale, California and surrounding areas.

        "DEBT" of any Person means (without duplication of any item): (a)
indebtedness of such Person for borrowed money; (b) indebtedness of such Person
for the deferred purchase price of property or services (except trade payables
and accrued expenses constituting current liabilities in the ordinary course of
business); (c) the face amount of any outstanding letters of credit issued for
the account of such Person; (d) obligations of such Person arising under
acceptance facilities; (e) guaranties, endorsements (other than for collection
in the ordinary course of business) and other contingent obligations of such
Person to purchase, to provide funds for payment, to provide funds to invest in
any Person, or otherwise to assure a creditor against loss; (f) obligations of
others secured by any Lien on property of such Person; (g) obligations of such
Person as lessee under Capital Leases; and (h) the obligations of such Person,
contingent or otherwise, under any lease of property or related documents
(including a separate purchase agreement) which provide that such Person or any
of its Affiliates must purchase or cause another Person to purchase any interest
in the leased property and thereby guarantee a minimum residual value of the
leased property to the lessor. For purposes of this definition, the amount of
the obligations described in clause (h) of the preceding sentence with respect
to any lease classified according to GAAP as an "operating lease," shall equal
the sum of (1) the present value of rentals and other minimum lease payments
required in connection with such lease [calculated in accordance with SFAS 13
and other GAAP relevant to the determination of the whether such lease must be
accounted for as


 Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 9
<PAGE>   66

an operating lease or capital lease], plus (2) the fair value of the property
covered by the lease; provided, however, that such amount shall not exceed the
price, as of the date a determination of Debt is required hereunder, for which
the lessee can purchase the leased property pursuant to any valid ongoing
purchase option if, upon such a purchase, the lessee shall be excused from
paying rentals or other minimum lease payments that would otherwise accrue after
the purchase.

        "DEFAULT" means any event which, with the passage of time or the giving
of notice or both, would (if not cured within any applicable cure period)
constitute an Event of Default.

        "DEFAULT RATE" means, for any period prior to the Designated Sale Date,
a floating per annum rate equal to two percent (2%) above the Prime Rate, and
for any period commencing on or after the Designated Sale Date, Default Rate
shall mean a floating per annum rate equal to five percent (5%) above the Prime
Rate. However, in no event will the "Default Rate" at any time exceed the
maximum interest rate permitted by law.

        "DEFAULTING PARTICIPANT" shall have the meaning assigned to it in
Section 1 of the Participation Agreement.

        "DEFECTIVE WORK" shall have the meaning assigned to it in subparagraph
1(A)(2)(f) of the Construction Management Agreement.

        "DEPOSIT TAKER" shall have the meaning assigned to it in the Pledge
Agreement.

        "DEPOSIT TAKER LOSSES" shall have the meaning assigned to it in the
Pledge Agreement.

        "DESIGNATED SALE DATE" means the earlier of:

        (1) the first Business Day of May, 2004; or

        (2) any Business Day designated as such in an irrevocable, unconditional
    notice given by NAI to BNPLC before NAI has made an Issue 97-10 Election;
    provided, that to be effective for purposes of this definition, any such
    notice from NAI to BNPLC must designate a Business Day that is more than
    thirty days after the date of such notice; and provided, further, to be
    effective for purposes of this definition, the notice must include an
    express, unconditional, unequivocal and irrevocable (A) waiver by NAI of any
    remaining right NAI may have under any of the Operative Documents to make
    any Issue 97-10 Election, and (B) acknowledgment by NAI that because of
    NAI's election to accelerate the Designated Sale Date, the Maximum
    Remarketing Obligation will equal the Break Even Price under the Purchase
    Agreement; or

        (3) any Business Day designated as such in a notice given by BNPLC to
    NAI after the effective date of any termination of the Construction
    Management Agreement as provided in subparagraphs 5(D) or 5(E) thereof;
    provided, that to be effective for purposes of this definition, any such
    notice from BNPLC to NAI must designate a Business Day that is more than
    thirty days after the date of such notice; or

        (4) the first Business Date after any termination by NAI of the Purchase
    Option and NAI's Initial Remarketing Rights and Obligations as provided in
    subparagraph 4(B) of the Purchase Agreement; or

        (5) any Business Day designated as such in a notice given by BNPLC to
    NAI when any Event of Default has occurred and is continuing; provided, that
    to be effective for purposes of this definition, any such notice from BNPLC
    to NAI must designate a Business Day that is more than thirty days after the
    date of such notice.


Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 10
<PAGE>   67

        "DEVELOPMENT DOCUMENTS" means the contracts, ordinances and other
documents described in Exhibit C attached to the Closing Certificate, as the
same may be modified from time to time in accordance with the Improvements Lease
and the Closing Certificate, and any applications, permits or certificates
concerning or affecting the use or development of the Property that may be
submitted, issued or executed from time to time as contemplated in such
contracts, ordinances and other documents or that BNPLC may hereafter execute,
approve or consent to at the request of NAI.

        "DIRECT PAYMENTS TO PARTICIPANTS" means the amounts paid or required to
be paid directly to Participants on the Designated Sale Date as provided in
Section 6.2 of the Pledge Agreement at the direction of and for NAI by the
collateral agent appointed pursuant to the Pledge Agreement from all or any part
of the Collateral described therein.

        "EFFECTIVE DATE" means May 3, 1999.

        "EFFECTIVE RATE" means for each Construction Period and for each Base
Rent Period, the per annum rate determined by dividing (A) LIBOR for such
Construction Period or Base Rent Period, as the case may be, by (B) one hundred
percent (100%) minus the Eurodollar Rate Reserve Percentage for such
Construction Period or Base Rent Period. If LIBOR or the Eurodollar Rate Reserve
Percentage changes from Construction Period to Construction Period or from Base
Rent Period to Base Rent Period, then the Effective Rate shall be automatically
increased or decreased as of the date of such change, as the case may be,
without prior notice to NAI. If for any reason BNPLC determines that it is
impossible or unreasonably difficult to determine the Effective Rate with
respect to a given Construction Period or Base Rent Period in accordance with
the foregoing, then the "EFFECTIVE RATE" for that Construction Period or Base
Rent Period shall equal any published index or per annum interest rate
determined in good faith by BNPLC's Parent to be comparable to LIBOR at the
beginning of the first day of that period. A comparable interest rate might be,
for example, the then existing yield on short term United States Treasury
obligations (as compiled by and published in the then most recently published
United States Federal Reserve Statistical Release H.15(519) or its successor
publication), plus or minus a fixed adjustment based on BNPLC's Parent's
comparison of past eurodollar market rates to past yields on such Treasury
obligations. Any determination by BNPLC of the Effective Rate under this
definition shall, in the absence of clear and demonstrable error, be conclusive
and binding upon NAI.

        "ENVIRONMENTAL LAWS " means any and all existing and future Applicable
Laws pertaining to safety, health or the environment, or to Hazardous Substances
or Hazardous Substance Activities, including the Comprehensive Environmental
Response, Compensation, and Liability Act of 1980, as amended by the Superfund
Amendments and Reauthorization Act of 1986 (as amended, "CERCLA"), and the
Resource Conservation and Recovery Act of 1976, as amended by the Used Oil
Recycling Act of 1980, the Solid Waste Disposal Act Amendments of 1980, and the
Hazardous and Solid Waste Amendments of 1984 (as amended, "RCRA").

        "ENVIRONMENTAL CUTOFF DATE" means the later of the dates upon which (i)
the Improvements Lease terminates, or (ii) NAI surrenders possession and control
of the Property and ceases to have interest in the Land or Improvements or
rights with respect thereto under any of the Operative Documents.

        "ENVIRONMENTAL LOSSES" means Losses suffered or incurred by BNPLC or
any other Interested Party, directly or indirectly, relating to or arising out
of, based on or as a result of any of the following: (i) any Hazardous Substance
Activity on or prior to the Environmental Cutoff Date; (ii) any violation on or
prior to the Environmental Cutoff Date of any applicable Environmental Laws
relating to the Property or to the ownership, use, occupancy or operation
thereof; (iii) any investigation, inquiry, order, hearing, action, or other
proceeding by or before any governmental or quasi-governmental agency or
authority in connection with any Hazardous Substance Activity that occurs or is
alleged to have occurred on or prior to the Environmental Cutoff Date; or (iv)
any claim, demand, cause of action or investigation, or any action or other
proceeding,


Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 11
<PAGE>   68

whether meritorious or not, brought or asserted against any Interested Party
which directly or indirectly relates to, arises from, is based on, or results
from any of the matters described in clauses (i), (ii), or (iii) of this
definition or any allegation of any such matters. For purposes of determining
whether Losses constitute "Environmental Losses," as the term is used in the
Improvements Lease, any actual or alleged Hazardous Substance Activity or
violation of Environmental Laws relating to the Property will be presumed to
have occurred prior to the Environmental Cutoff Date unless NAI establishes by
clear and convincing evidence to the contrary that the relevant Hazardous
Substance Activity or violation of Environmental Laws did not occur or commence
prior to the Environmental Cutoff Date.

        "ENVIRONMENTAL REPORTS" means collectively the following reports
(whether one or more), which were provided by NAI to BNPLC prior to the
Effective Date: Phase I dated March 1997 by Hygeienetics Environmental Services,
Inc.; Phase I dated June 1998 by Dames & Moore; and, an Asbestos Containing
Material Survey conducted in 1989 by Vesar, Inc.

        "ERISA" means the Employee Retirement Income Security Act of 1974, as
amended from time to time, together with all rules and regulations promulgated
with respect thereto.

        "ERISA AFFILIATE" means any Person who for purposes of Title IV of
ERISA is a member of NAI's controlled group, or under common control with NAI,
within the meaning of Section 414 of the Internal Revenue Code, and the
regulations promulgated and rulings issued thereunder.

        "ESCROWED PROCEEDS" means, subject to the exclusions specified in the
next sentence, any money that is received by BNPLC from time to time during the
Term (and any interest earned thereon) from any party (1) under any property
insurance policy as a result of damage to the Property, (2) as compensation for
any restriction imposed by any governmental authority upon the use or
development of the Property or for the condemnation of the Property or any
portion thereof, (3) because of any judgment, decree or award for physical
damage to the Property or (4) as compensation under any title insurance policy
or otherwise as a result of any title defect or claimed title defect with
respect to the Property; provided, however, in determining the amount of
"Escrowed Proceeds" there shall be deducted all expenses and costs of every
type, kind and nature (including Attorneys' Fees) incurred by BNPLC to collect
such proceeds. Notwithstanding the foregoing, "Escrowed Proceeds" will not
include (A) any payment to BNPLC by a Participant or an Affiliate of BNPLC that
is made to compensate BNPLC for the Participant's or Affiliate's share of any
Losses BNPLC may incur as a result of any of the events described in the
preceding clauses (1) through (4), (B) any money or proceeds that have been
applied as a Qualified Prepayment or to pay any Breakage Costs or other costs
incurred in connection with a Qualified Prepayment, (C) any money or proceeds
that, after no less than ten days notice to NAI, BNPLC returns or pays to a
third party because of BNPLC's good faith belief that such return or payment is
required by law, (D) any money or proceeds paid by BNPLC to NAI or offset
against any amount owed by NAI, or (E) any money or proceeds used by BNPLC in
accordance with the Improvements Lease for repairs or the restoration of the
Property or to obtain development rights or the release of restrictions that
will inure to the benefit of future owners or occupants of the Property. Until
Escrowed Proceeds are paid to NAI pursuant to Paragraph 10 of the Improvements
Lease, transferred to a purchaser under the Purchase Agreement as therein
provided or applied as a Qualified Prepayment or as otherwise described in the
preceding sentence, BNPLC shall keep the same deposited in one or more interest
bearing accounts, and all interest earned on such account shall be added to and
made a part of Escrowed Proceeds.

        "ESTABLISHED MISCONDUCT" of a Person means, and is limited to: (1) if
the Person is bound by the Operative Documents or the Participation Agreement, a
breach by such Person of the express provisions of the Operative Documents or
the Participation Agreement, as applicable, that continues beyond any period for
cure provided therein, and (2) conduct of such Person or its Affiliates that has
been determined to constitute wilful misconduct or Active Negligence in or as a
necessary element of a final judgment rendered against such Person by a court
with jurisdiction to make such determination. Established


Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 12
<PAGE>   69

Misconduct of one Interested Party shall not be attributed to a second
Interested Party unless the second Interested Party is an Affiliate of the
first. Negligence which does not constitute Active Negligence shall not in any
event constitute Established Misconduct. For purposes of this definition,
"conduct of a Person" will include (1) the conduct of an employee of that
Person, but only to the extent that the employee is acting within the scope of
his employment by that Person, as determined in or as a necessary element of a
final judgment rendered against such Person by a court with jurisdiction to make
such determination, and (2) the conduct of an agent of that Person (such as an
independent environmental consultant engaged by that Person), but only to the
extent that the agent is, as determined in or as a necessary element of a final
judgment rendered against such Person by a court with jurisdiction to make such
determination, (x) acting within the scope of the authority granted to him by
such Person, (y) not acting with the consent or approval of or under the
direction of NAI or NAI's Affiliates, employees or agents, and (z) not acting in
good faith to mitigate Losses that such Person may suffer because of a breach or
repudiation by NAI of the Improvements Lease or the Purchase Documents.

        "EUROCURRENCY LIABILITIES" shall have the meaning assigned to it in
Regulation D of the Board of Governors of the Federal Reserve System, as in
effect from time to time.

        "EURODOLLAR RATE RESERVE PERCENTAGE" means, for purposes of determining
the Effective Rate for any Construction Period or Base Rent Period, the reserve
percentage applicable two Business Days before the first day of such period
under regulations issued from time to time by the Board of Governors of the
Federal Reserve System (or any successor) for determining the maximum reserve
requirement (including any emergency, supplemental or other marginal reserve
requirement) for BNPLC's Parent with respect to liabilities or deposits
consisting of or including Eurocurrency Liabilities (or with respect to any
other category or liabilities by reference to which LIBOR is determined) having
a term comparable to such period.

        "EVENT OF DEFAULT" shall have the meaning assigned to it in
subparagraph 17 of the Improvements Lease.

        "EXCLUDED TAXES" means (1) all federal, state and local income taxes
upon Base Rent, Administrative Agency Fees, any interest paid to BNPLC or any
Participant pursuant to subparagraph 3.(j) of the Improvements Lease, and any
additional compensation claimed by BNPLC pursuant to subparagraph 5.(b)(ii) of
the Improvements Lease; (2) any transfer or change of ownership taxes assessed
because of BNPLC's transfer or conveyance to any third party of any rights or
interest in the Improvements Lease, the Purchase Agreement or the Property
(other than any such taxes assessed because of any Permitted Transfer under
clauses (1), (3), (4), (5), (6) or (7) of the definition of Permitted Transfer
in this Agreement), (3) all federal, state and local income taxes upon any
amounts paid as reimbursement for or to satisfy Losses incurred by BNPLC or any
Participant to the extent such taxes are offset by a corresponding reduction of
BNPLC's or the applicable Participant's income taxes because of BNPLC's or such
Participant's deduction of the reimbursed Losses from its taxable income or
because of any tax credits attributable thereto. If, however, a change in
Applicable Laws after the Effective Date results in an increase in such taxes
for any reason other than an increase in the applicable tax rates (e.g., a
disallowance of deductions that would otherwise be available against payments
described in clause (A) of this definition), then for purposes of the Operative
Documents, the term "Excluded Taxes" will not include the increase in such taxes
attributable to the change.

        "EXISTING CONTRACT" means the Purchase and Sale Agreement dated July
31, 1998, between Seller and NAI covering the Land described in Exhibit A
attached to the Improvements Lease, as amended by a First Amendment to Purchase
and Sale Agreement dated as of December 9, 1999, the interests of NAI therein
having being assigned to BNPLC pursuant to the assignment dated as of May 3,
1999 between NAI and BNPLC, with the consent and approval of Seller.


Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 13
<PAGE>   70

        "EXISTING SPACE LEASES" means the following leases (whether one or
more) of space within the Improvements to the extent the same are still in force
on the Effective Date: indenture of lease dated June 12, 1975 between The
Equitable Life Assurance Society of the United States, and landlord, and ESL
Incorporated, as tenant, as amended by (a) that certain extension of lease dated
June 16, 1980; (b) that certain extension of lease dated March 20, 1985; (c)
that certain lease amendment dated August 1, 1989; (d) that certain lease
amendment dated September 1, 1991; and (e) that certain third amendment to lease
dated July 6, 1998.

        "FAILED COLLATERAL TEST DATE" means any date upon which commences a
Mandatory Collateral Period as described in Part III of Schedule 1 attached to
the Improvements Lease.

        "FED FUNDS RATE" means, for any period, a fluctuating interest rate
(expressed as a per annum rate and rounded upwards, if necessary, to the next
1/16 of 1%) equal for each day during such period to the weighted average of the
rates on overnight Federal funds transactions with members of the Federal
Reserve System arranged by Federal funds brokers, as published for such day (or,
if such day is not a Business Day, for the next preceding Business Day) by the
Federal Reserve Bank of New York, or, if such rates are not so published for any
day which is a Business Day, the average of the quotations for such day on such
transactions received by BNPLC's Parent from three Federal funds brokers of
recognized standing selected by BNPLC's Parent. All determinations of the Fed
Funds Rate by BNPLC's Parent shall, in the absence of clear and demonstrable
error, be binding and conclusive upon NAI.

        "FOCB NOTICE" shall have the meaning assigned to it in subparagraph
5(B)(1) of the Construction Management Agreement.

        "FUNDED CONSTRUCTION ALLOWANCE" means on any day the Outstanding
Construction Allowance on that day, including all Construction Advances and
Carrying Costs added to the Outstanding Construction Allowance on or prior to
that day, plus the amount of any Qualified Prepayments deducted on or prior to
that day in the calculation of such Outstanding Construction Allowance, less any
Voluntary NAI Construction Contributions added on or prior to that day in the
calculation of such Qualified Prepayments.

        "FUNDING ADVANCES" means (1) the Initial Funding Advance and (2) all
future advances made by BNPLC's Parent or any other Participant to or on behalf
of BNPLC to allow BNPLC to provide the Construction Allowance.

        "FUTURE WORK" shall have the meaning assigned to it in subparagraph
2(C)(2)(b) of the Construction Management Agreement.

        "GAAP" means generally accepted accounting principles in the United
States of America as in effect from time to time, applied on a basis consistent
with those used in the preparation of the financial statements referred to in
subparagraph 13.(a) of the Improvements Lease (except for changes with which
NAI's independent public accountants concur).

        "HAZARDOUS SUBSTANCE" means (i) any chemical, compound, material,
mixture or substance that is now or hereafter defined or listed in, regulated
under, or otherwise classified pursuant to, any Environmental Laws as a
"hazardous substance," "hazardous material," "hazardous waste," "extremely
hazardous waste or substance," "infectious waste," "toxic substance," "toxic
pollutant," or any other formulation intended to define, list or classify
substances by reason of deleterious properties, including ignitability,
corrosiveness, reactivity, carcinogenicity, toxicity or reproductive toxicity;
(ii) petroleum, any fraction of petroleum, natural gas, natural gas liquids,
liquified natural gas, synthetic gas usable for fuel (or mixtures of natural gas
and such synthetic gas), and ash produced by a resource recovery facility
utilizing a municipal solid waste stream, and drilling


Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 14
<PAGE>   71

fluids, produced waters and other wastes associated with the exploration,
development or production of crude oil, natural gas or geothermal resources;
(iii) asbestos and any asbestos containing material; and (v) any other material
that, because of its quantity, concentration or physical or chemical
characteristics, poses a significant present or potential hazard to human health
or safety or to the environment if released into the workplace or the
environment.

        "HAZARDOUS SUBSTANCE ACTIVITY" means any actual, proposed or threatened
use, storage, holding, release (including any spilling, leaking, leaching,
pumping, pouring, emitting, emptying, dumping, disposing into the environment,
and the continuing migration into or through soil, surface water, groundwater or
any body of water), discharge, deposit, placement, generation, processing,
construction, treatment, abatement, removal, disposal, disposition, handling or
transportation of any Hazardous Substance from, under, in, into or on the
Property, including the movement or migration of any Hazardous Substance from
surrounding property, surface water, groundwater or any body of water under, in,
into or onto the Property and any resulting residual Hazardous Substance
contamination in, on or under the Property. "HAZARDOUS SUBSTANCE ACTIVITY" also
means any existence of Hazardous Substances on the Property that would cause the
Property or the owner or operator thereof to be in violation of, or that would
subject the Property to any remedial obligations under, any Environmental Laws,
including CERCLA and RCRA, assuming disclosure to the applicable governmental
authorities of all relevant facts, conditions and circumstances pertaining to
the Property.

        "IMPOSITIONS" means all sales, excise, ad valorem, gross receipts,
business, transfer, stamp, occupancy, rental and other taxes, levies, fees,
charges, surcharges, assessments or penalties which arise out of or are
attributable to the Improvements Lease or which are imposed upon BNPLC or the
Property because of the ownership, leasing, occupancy, sale or operation of the
Property, or any part thereof or interest therein, or relating to or required to
be paid by any of the Permitted Encumbrances or the Development Documents,
excluding only Excluded Taxes. "IMPOSITIONS" shall include real estate taxes
imposed because of a change of use or ownership of the Property on or prior to
the date of any sale by BNPLC pursuant to the Purchase Agreement.

        "IMPROVEMENTS " means any and all (1) buildings and other real property
improvements now or hereafter erected on the Land, and (2) equipment (e.g., HVAC
systems, elevators and plumbing fixtures) attached to the buildings or other
real property improvements, the removal of which would cause structural or other
material damage to the buildings or other real property improvements or would
materially and adversely affect the value or use of the buildings or other real
property improvements.

        "IMPROVEMENTS LEASE " means the Lease Agreement (Phase II -
Improvements") dated as of May 3, 1999 between BNPLC, as landlord, and NAI, as
tenant, pursuant to which NAI has agreed to lease BNPLC's interest in the
Property, as such Lease Agreement may be extended, supplemented, amended,
restated or otherwise modified from time to time in accordance with its terms.

        "INITIAL FUNDING ADVANCE " means the advance made by BNPLC's Parent
(directly or through one or more of its Affiliates) to or on behalf of BNPLC on
or prior to the Effective Date to cover the cost of BNPLC's acquisition of the
Property and certain Transaction Expenses and other amounts described in this
definition. The amount of the Initial Funding Advance may be confirmed by a
separate closing certificate executed by NAI as of the Effective Date. To the
extent that BNPLC does not itself use the entire Initial Funding Advance to pay
Transaction Expenses incurred by BNPLC, the remainder thereof will be advanced
to NAI, with the understanding that NAI shall use any such amount advanced for
one or more of the following purposes: (1) the payment or reimbursement of
Transaction Expenses incurred by NAI; (2) the payment or reimbursement of
expenses incurred by NAI in connection with the Construction Project, including
the planning, design, engineering, construction and permitting of thereof; (3)
the maintenance of the Property; or (4) the payment of Rents next due.


Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 15
<PAGE>   72

        "INTERESTED PARTY" means each of (1) BNPLC, its Affiliates and its
successors and assigns as to the Property or any part thereof or any interest
therein, (2) BNPLC's Parent, and (3) any other Participants and their permitted
successors and assigns under the Participation Agreement; provided, however,
none of the following shall constitute an Interested Party: (a) any Person to
whom BNPLC may transfer an interest in the Property by a conveyance that is not
a Permitted Transfer and others that cannot lawfully claim an interest in the
Property except through or under such a transfer by BNPLC, (b) NAI or any Person
that cannot lawfully claim an interest in the Property except through or under a
conveyance from NAI, or (c) any Applicable Purchaser under the Purchase
Agreement and any Person that cannot lawfully claim an interest in the Property
except through or under a conveyance from such Applicable Purchaser.

        "ISSUE 97-1 NON-PERFORMANCE-RELATED SUBJECTIVE EVENT OF DEFAULT" means
an Event of Default that is unrelated to the Property or the use or maintenance
thereof and that results solely from (A) a breach by NAI of a provision in any
Operative Document, the occurrence of which breach cannot be objectively
determined, or (B) any other event described in subparagraph 17.(e) of the
Improvements Lease, the occurrence of which event cannot be objectively
determined. For example, an Event of Default under subparagraph 17.(e) of the
Improvements Lease resulting solely from a failure of NAI to "generally" pay its
debts as such debts become due (in contrast to a failure of NAI to pay Rent to
BNPLC as it becomes due under the Improvements Lease) would constitute an Issue
97-1 Non-performance-related Subjective Event of Default. In no event, however,
will the term "Issue 97-1 Non-performance-related Subjective Event of Default"
include an Event of Default resulting from (1) a failure of NAI to make any
payment required to BNPLC under the Operative Documents, (2) a breach by NAI of
the provisions set forth in Schedule 1 attached to the Improvements Lease (which
set forth financial covenants), (3) any failure of NAI to use, maintain and
insure the Property in accordance with the requirements of the Improvements
Lease, or (4) any failure of NAI to pay the full amount of any Supplemental
Payment on the Designated Sale Date as required by the Purchase Agreement.
Except as provided in subparagraph 1(A)(2)(c)(i) of the Purchase Agreement, the
characterization of any Event of Default as an Issue 97-1
Non-performance-related Subjective Event of Default will not affect the rights
or remedies available to BNPLC because of the Event of Default.

        "ISSUE 97-10 ELECTION" means any of the following elections by NAI: (1)
an election to terminate the Construction Management Agreement as provided in
subparagraph 5(D) thereof; and (2) an election to terminate NAI's Initial
Remarketing Rights and Obligations as provided in subparagraph 4(B) of the
Purchase Agreement.

        "ISSUE 97-10 PREPAYMENT" means a payment to BNPLC, required by
subparagraph 3.(h) of the Improvements Lease or by subparagraphs 4(B) or 4(C) of
the Purchase Agreement, equal in each case to (A) the Maximum Permitted
Prepayment, computed as of the date on which the payment becomes due, less (B)
the accreted value of any prior payments actually received by BNPLC from NAI
constituting Issue 97-10 Prepayments or Voluntary NAI Construction
Contributions. For purposes of the preceding sentence, "accreted value" of a
payment shall mean the amount of the payment plus an amount equal to the
interest that would have accrued on the payment if it bore interest at the
Effective Rate.

        "LAND" means the land covered by the land described in Exhibit A
attached to the Closing Certificate, the Improvements Lease and the Purchase
Agreement.

        "LANDLORD'S ELECTION TO CONTINUE CONSTRUCTION" shall have the meaning
assigned to it in subparagraph 6.(e) of the Improvements Lease.

        "LIBOR" means, for purposes of determining the Effective Rate for each
Construction Period or Base Rent Period, the rate determined by BNPLC's Parent
to be the average rate of interest per annum (rounded upwards, if necessary, to
the


Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 16
<PAGE>   73

next 1/16 of 1%) of the rates at which deposits of dollars are offered or
available to BNPLC's Parent in the London interbank market at approximately
11:00 a.m. (London time) on the second Business Day preceding the first day of
such period. BNPLC shall instruct BNPLC's Parent to consider deposits, for
purposes of making the determination described in the preceding sentence, that
are offered: (i) for delivery on the first day of such Construction Period or
Base Rent Period, as the case may be, (ii) in an amount equal or comparable to
the total (projected on the applicable date of determination by BNPLC's Parent)
Stipulated Loss Value on the first day of such period, and (iii) for a time
equal or comparable to the length of such period. If BNPLC's Parent so chooses,
it may determine LIBOR for any period by reference to the rate reported by the
British Banker's Association on Page 3750 of the Telerate Service at
approximately 11:00 a.m. (London time) on the second Business Day preceding the
first day of such period. If for any reason BNPLC's Parent determines that it is
impossible or unreasonably difficult to determine LIBOR with respect to a given
Construction Period or Base Rent Period in accordance with the foregoing, or if
BNPLC's Parent shall determine that it is unlawful (or any central bank or
governmental authority shall assert that it is unlawful) for BNPLC, BNPLC's
Parent or any Participant to provide or maintain Funding Advances during any
Construction Period or Base Rent Period for which Carrying Costs or Base Rent is
computed by reference to LIBOR, then "LIBOR" for that period shall equal the
Base Rate for that period. All determinations of LIBOR by BNPLC's Parent shall,
in the absence of clear and demonstrable error, be binding and conclusive upon
NAI.

        "LIBOR PERIOD ELECTION" for any Base Rent Period means a period of one
month, three months or six months as designated by NAI at least five Business
Days prior to the commencement of such Base Rent Period by a notice given to
BNPLC in the form of Exhibit C attached to the Improvements Lease. (For purposes
of the Improvements Lease a LIBOR Period Election for any Base Rent Period shall
also be considered the LIBOR Period Election in effect on the Base Rent
Commencement Date or Base Rent Date upon which such Base Rent Period begins.)
Any Libor Period Election so designated by NAI shall remain in effect for the
entire Base Rent Period specified in NAI's notice to BNPLC (provided such Base
Rent Period commences at least ten Business Days after BNPLC's receipt of the
notice) and for all subsequent Base Rent Periods until a new designation becomes
effective in accordance with the provisions set forth in this definition.
Notwithstanding the foregoing, however: (1) NAI shall not be entitled to
designate a LIBOR Period Election that would cause a Base Rent Period to extend
beyond the end of the scheduled Term; (2) changes in the LIBOR Period Election
shall become effective only upon the commencement of a new Base Rent Period; (3)
for each Base Rent Period that occurs within any Mandatory Collateral Period,
the LIBOR Period Election shall be one month; (4) no LIBOR Period Election
designated by NAI hereunder shall be different than the LIBOR Period Election
specified under (and as defined in) the Other Common Definitions and Provisions
Agreement; and (5) if NAI fails to make a LIBOR Period Election consistent with
the foregoing requirements for any Base Rent Period, or if an Event of Default
shall have occurred and be continuing on the third Business Day preceding the
commencement of any Base Rent Period, the LIBOR Period Election for such Base
Rent Period shall be deemed to be one month.

        "LIEN" means any mortgage, pledge, security interest, encumbrance, lien
or charge of any kind (including any agreement to give any of the foregoing, any
conditional sale or other title retention agreement, any lease in the nature
thereof, any agreement to sell receivables with recourse, and the filing of or
agreement to give any financing statement under the Uniform Commercial Code of
any jurisdiction). In addition, for purposes of subparagraph A.(8) of Part IV of
Schedule 1 attached to the Improvements Lease, "Lien" includes any Liens under
ERISA relating to Unfunded Benefit Liabilities of which NAI is required to
notify BNPLC under subparagraph 13.(a)(vii) of the Improvements Lease
(irrespective of whether NAI actually notifies BNPLC as required thereunder).

        "LIENS REMOVABLE BY BNPLC" means, and is limited to, Liens encumbering
the Property that are asserted (1) other than as contemplated in the Operative
Documents, by BNPLC itself, (2) by third parties lawfully claiming through or
under BNPLC (which for purposes of the Improvements Lease shall include any
judgment liens established against the Property


Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 17
<PAGE>   74

because of a judgment rendered against BNPLC and shall also include any liens
established against the Property to secure past due Excluded Taxes), or (3) by
third parties lawfully claiming under a deed or other instrument duly executed
by BNPLC; provided, however, Liens Removable by BNPLC shall not include (A) any
Permitted Encumbrances or Development Documents (regardless of whether claimed
through or under BNPLC), (B) the Operative Documents or any other document
executed by BNPLC with the knowledge of (and without objection by) NAI's counsel
contemporaneously with the execution and delivery of the Operative Documents,
(C) Liens which are neither lawfully claimed through or under BNPLC (as
described above) nor claimed under a deed or other instrument duly executed by
BNPLC, (D) Liens claimed by NAI or claimed through or under a conveyance made by
NAI, (E) Liens arising because of BNPLC's compliance with Applicable Law, the
Operative Documents, Permitted Encumbrances, the Development Documents or any
written request made by NAI, (F) Liens securing the payment of property taxes or
other amounts assessed against the Property by any governmental authority, other
than to secure the payment of past due Excluded Taxes or to secure damages
caused by (and attributed by any applicable principles of comparative fault to)
BNPLC's own Established Misconduct, (G) Liens resulting from or arising in
connection with any breach by NAI of the Operative Documents; or (H) Liens
resulting from or arising in connection with any Permitted Transfer that occurs
more than thirty days after any Designated Sale Date upon which, for any reason,
NAI or an Affiliate of NAI or any Applicable Purchaser shall not purchase
BNPLC's interest in the Property pursuant to the Purchase Agreement for a cash
price to BNPLC (when taken together with any Supplemental Payment made by NAI
pursuant to Paragraph 1(A)(2) of the Purchase Agreement, in the case of a
purchase by an Applicable Purchaser) equal to the Break Even Price.

        "LOSSES" means the following: any and all losses, liabilities, damages
(whether actual, consequential, punitive or otherwise denominated), demands,
claims, administrative or legal proceedings, actions, judgments, causes of
action, assessments, fines, penalties, costs and expenses (including Attorneys'
Fees and the fees of outside accountants and environmental consultants), of any
and every kind or character, foreseeable and unforeseeable, liquidated and
contingent, proximate and remote.

        "MANDATORY COLLATERAL PERIOD" shall have the meaning assigned to it in
Part I of Schedule 1 attached to the Improvements Lease and to the Pledge
Agreement.

        "MATERIAL ENVIRONMENTAL COMMUNICATION" means a communication between
NAI or its agents and a regulatory agency or third party, which causes, or
potentially could cause (whether by implementation of or response to said
communication), a material change in the scope, duration, or nature of any
Remedial Work.

       "MAXIMUM CONSTRUCTION ALLOWANCE" means an amount equal to $19,250,000,
less the sum of the Initial Funding Advance under and as defined in this
Agreement and the Initial Funding Advance under and as defined in the Other
Common Definitions and Provisions Agreement.

        "MAXIMUM PERMITTED TERMINATION FEES" shall have the meaning indicated
in subparagraph 1(A)(2)(b) of the Construction Management Agreement.

        "MAXIMUM PERMITTED PREPAYMENT" as of any date means the amount equal to
the lesser of the following:

        (1) eighty-nine and nine-tenths of one percent (89.9%) of the aggregate
    of (i) all Project Costs paid or incurred on or prior to such date, plus
    (ii) ninety-seven percent (97%) of (a) Carrying Costs added to the
    Outstanding Construction Allowance on or prior to such date, and (b)
    Commitment Fees reimbursed pursuant to the Construction Management Agreement
    on or prior to such date, plus (iii) any Upfront Syndication Fees paid to
    Participants pursuant to the Closing Certificate and Agreement and
    reimbursed pursuant to the Construction Management Agreement on or prior to
    such date; or


Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 18
<PAGE>   75

        (2) eighty-nine and nine-tenths of one percent (89.9%) of Stipulated
    Loss Value on such date.

        "MAXIMUM REMARKETING OBLIGATION" shall have the meaning indicated in
subparagraph 1(A)(2)(c) of the Purchase Agreement.

        "MINIMUM EXTENDED REMARKETING PRICE" shall have the meaning assigned to
it in subparagraph 2(B) of the Purchase Agreement.

        "MULTIEMPLOYER PLAN" means a multiemployer plan as defined in Section
3(37) of ERISA to which contributions have been made by NAI or any ERISA
Affiliate during the preceding six years and which is covered by Title IV of
ERISA.

        "NAI" means Network Appliance, Inc., a California corporation.

        "NAI'S EXTENDED REMARKETING PERIOD" shall have the meaning assigned to
it in subparagraph 2(A) of the Purchase Agreement.

        "NAI'S EXTENDED REMARKETING RIGHT" shall have the meaning assigned to
it in subparagraph 2(A) of the Purchase Agreement.

        "NAI'S INITIAL REMARKETING RIGHTS AND OBLIGATIONS" shall have the
meaning assigned to it in subparagraph 1(A)(2) of the Purchase Agreement.

        "NORMAL TENANT IMPROVEMENTS" shall have the meaning assigned to it in
subparagraph 3(A) of the Construction Management Agreement.

        "NOTICE OF NAI'S INTENT TO TERMINATE" shall have the meaning assigned
to it in subparagraph 5(D) of the Construction Management Agreement.

        "OPERATIVE DOCUMENTS" means the Closing Certificate, the Improvements
Lease, the Construction Management Agreement, the Purchase Agreement, the Pledge
Agreement and this Common Definitions and Provisions Agreement (Phase II -
Improvements).

        "OTHER COMMON DEFINITIONS AND PROVISIONS AGREEMENT" means the Common
Definitions and Provisions Agreement (Phase II - Land), dated as of the
Effective Date, between BNPLC and NAI, as such Common Definitions and Provisions
Agreement may be extended, supplemented, amended, restated or otherwise modified
from time to time in accordance with its terms.

        "OTHER LEASE AGREEMENT" means the Lease Agreement (Phase II - Land),
dated as of the Effective Date, between BNPLC and NAI, as such Lease Agreement
may be extended, supplemented, amended, restated or otherwise modified from time
to time in accordance with its terms.

        "OTHER PURCHASE AGREEMENT" means the Purchase Agreement (Phase II -
Land), dated as of the Effective Date, between BNPLC and NAI, as such Purchase
Agreement may be extended, supplemented, amended, restated or otherwise modified
from time to time in accordance with its terms.


Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 19
<PAGE>   76

        "OUTSTANDING CONSTRUCTION ALLOWANCE" shall have the meaning assigned to
it in subparagraph 6.(a) of the Improvements Lease.

        "PARTICIPANT" means BNPLC's Parent and any other Person that, upon
becoming a party to the Participation Agreement and the Pledge Agreement by
executing supplements as contemplated therein, agrees from time to time to
participate in all or some of the risks and rewards to BNPLC of the Improvements
Lease and the Purchase Documents. As of the Effective Date, the only Participant
is BNPLC's Parent, but BNPLC may agree after the Effective Date to share in
risks and rewards of the Improvements Lease and the Purchase Documents with
other Participants. However, no Person other than BNPLC's Parent and its
Affiliates shall qualify as a Participant for purposes of the Operative
Documents or other agreements concerning the Property to which NAI is a party
unless such Person, during the continuance of an Event of Default or otherwise
with NAI's prior written approval (which approval will not be unreasonably
withheld), became a party to the Pledge Agreement and to the Participation
Agreement by executing supplements to those agreements as contemplated therein.

        "PARTICIPATION AGREEMENT" means the Participation Agreement between
BNPLC and BNPLC's Parent dated as of the Effective Date, pursuant to which
BNPLC's Parent has agreed to participate in the risks and rewards to BNPLC of
the Improvements Lease and the other Operative Documents, as such Participation
Agreement may be extended, supplemented, amended, restated or otherwise modified
from time to time in accordance with its terms. It is understood, however, that
because the Participation Agreement expressly makes NAI a third party
beneficiary of the Participant's obligations thereunder to make advances to
BNPLC in connection with Construction Advances under the Construction Management
Agreement, NAI's consent will be required to any amendment of the Participation
Agreement that purports to limit or excuse such obligations.

        "PBGC" means the Pension Benefit Guaranty Corporation and any entity
succeeding to any or all of its functions under ERISA.

        "PERIOD" means a Construction Period or a Base Rent Period, as the
context requires.

        "PERMITTED ENCUMBRANCES" means (i) the encumbrances and other matters
affecting the Property that are set forth in Exhibit B attached to the Closing
Certificate, (ii) any easement agreement or other document affecting title to
the Property executed by BNPLC at the request of or with the consent of NAI
(including the Other Lease Agreement, the Other Purchase Agreement and all
documents executed by BNPLC pursuant to the Other Purchase Agreement), (iii) any
ground lease executed pursuant to the Other Purchase Agreement, (iv) any Liens
securing the payment of Impositions which are not delinquent or claimed to be
delinquent or which are being contested in accordance with subparagraph 5.(a) of
the Improvements Lease, and (iv) mechanics' and materialmen's liens for amounts
not past due or claimed to be past due or which are being contested in
accordance with subparagraph 11.(c) of the Improvements Lease.

        "PERMITTED HAZARDOUS SUBSTANCE USE" means the use, generation, storage
and offsite disposal of Permitted Hazardous Substances in strict accordance with
applicable Environmental Laws and with due care given the nature of the
Hazardous Substances involved; provided, the scope and nature of such use,
generation, storage and disposal shall not:

        (1) exceed that reasonably required for the construction of the
    Construction Project in accordance with the Improvements Lease and the
    Construction Management Agreement or for the operation of the Property for
    the purposes expressly permitted under subparagraph 2.(a) of the
    Improvements Lease; or


Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 20
<PAGE>   77

        (2) include any disposal, discharge or other release of Hazardous
    Substances from the Property in any manner that might allow such substances
    to reach surface water or groundwater, except (i) through a lawful and
    properly authorized discharge (A) to a publicly owned treatment works or (B)
    with rainwater or storm water runoff in accordance with Applicable Laws and
    any permits obtained by NAI that govern such runoff; or (ii) any such
    disposal, discharge or other release of Hazardous Substances for which no
    permits are required and which are not otherwise regulated under applicable
    Environmental Laws.

Further, notwithstanding anything to the contrary herein contained, Permitted
Hazardous Substance Use shall not include any use of the Property in a manner
that requires a RCRA treatment, storage or disposal permit, including a
landfill, incinerator or other waste disposal facility.

        "PERMITTED HAZARDOUS SUBSTANCES" means Hazardous Substances used and
reasonably required for the construction of the Construction Project or for the
use of the Property by NAI and its permitted subtenants and assigns for the
purposes expressly permitted by subparagraph 2.(a) of the Improvements Lease, in
either case in strict compliance with all Environmental Laws and with due care
given the nature of the Hazardous Substances involved. Without limiting the
generality of the foregoing, Permitted Hazardous Substances shall include usual
and customary office, laboratory and janitorial products.

        "PERMITTED TRANSFER" means any one or more of the following: (1) the
creation or conveyance by BNPLC of rights and interests in favor of any
Participant pursuant to the Participation Agreement; (2) the creation or
conveyance of rights and interests in favor of or to Banque Nationale de Paris
(through its San Francisco Branch or otherwise), as BNPLC's Parent, or any other
Qualified Affiliate of BNPLC, provided that NAI must be notified before any such
conveyance to Banque Nationale de Paris or another Qualified Affiliate of (A)
any interest in the Property or any portion thereof by an assignment or other
document which will be recorded in the real property records of San Mateo
County, California or (B) BNPLC's entire interest in the Land and the Property;
(3) any assignment or conveyance by BNPLC or its permitted successors or assigns
to any present or future Participant of any lien or security interest against
the Property (in contrast to a conveyance of BNPLC's fee estate in the Land and
Improvements) or of any interest in Rent, payments required by or under the
Purchase Documents or payments to be generated from the Property after the Term,
provided that such assignment or conveyance is made expressly subject to the
rights of NAI under the Operative Documents; (4) any agreement to exercise or
refrain from exercising rights or remedies under the Operative Documents made by
BNPLC with any present or future Participant; (5) any assignment or conveyance
by BNPLC requested by NAI or required by any Permitted Encumbrance, by the
Purchase Agreement, by the Existing Contract, by any other Development Contract
or by Applicable Laws; or (6) any assignment or conveyance after a Designated
Sale Date on which NAI shall not have purchased or caused an Applicable
Purchaser to purchase BNPLC's interest in the Property and, if applicable, after
the expiration of the thirty day cure period specified in Paragraph 4(D) of the
Purchase Agreement.

        "PERSON" means an individual, a corporation, a partnership, an
unincorporated organization, an association, a joint stock company, a joint
venture, a trust, an estate, a government or agency or political subdivision
thereof or other entity, whether acting in an individual, fiduciary or other
capacity.

        "PERSONAL PROPERTY" shall have the meaning assigned to it on page of
the Improvements Lease.

        "PLAN" means any employee benefit or other plan established or
maintained, or to which contributions have been made, by NAI or any ERISA
Affiliate of NAI during the preceding six years and which is covered by Title IV
of ERISA, other than a Multiemployer Plan.


Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 21
<PAGE>   78

        "PLEDGE AGREEMENT" means the Pledge Agreement (Phase II - Improvements)
dated as of the date hereof between BNPLC and NAI, pursuant to which NAI may
pledge certificates of deposit as security for NAI's obligations under the
Purchase Agreement (and for the corresponding obligations of BNPLC to the
Participants under the Participation Agreement), as such Pledge Agreement may be
extended, supplemented, amended, restated or otherwise modified from time to
time in accordance with its terms.

        "PRE-COMMENCEMENT CASUALTY" shall have the meaning assigned to it in
subparagraph 1(A)(2)(a) of the Construction Management Agreement.

        "PREEMPTIVE NOTICE" shall have the meaning assigned to it in
subparagraph 5(B)(2) of the Construction Management Agreement.

        "PRIME RATE" means the prime interest rate or equivalent charged by
BNPLC's Parent in the United States of America as announced or published by
BNPLC's Parent from time to time, which need not be the lowest interest rate
charged by BNPLC's Parent. If for any reason BNPLC's Parent does not announce or
publish a prime rate or equivalent, the prime rate or equivalent announced or
published by either CitiBank, N.A. or any New York branch or office of Credit
Commercial de France as selected by BNPLC shall be used to compute the rate
describe in the preceding sentence. The prime rate or equivalent announced or
published by such bank need not be the lowest rate charged by it. The Prime Rate
may change from time to time after the Effective Date without notice to NAI as
of the effective time of each change in rates described in this definition.

        "PRIOR WORK" shall have the meaning assigned to it in subparagraph
2(C)(2)(b) of the Construction Management Agreement.

        "PROJECT COSTS" means the following:

        (a) costs incurred for the Work (as defined in the Construction
    Management Agreement), including not only hard costs incurred for the new
    Improvements described in Exhibit C attached to the Construction Management
    Agreement, but also the following costs to the extent reasonably incurred in
    connection with the Construction Project:

                -       soft costs, such as architectural fees, engineering fees
                        and fees and costs paid in connection with obtaining
                        project permits and approvals required by governmental
                        authorities or the Development Documents,

                -       site preparation costs, and

                -       costs of offsite and other public improvements required
                        as conditions of governmental approvals for the
                        Construction Project;

        (b) costs incurred to maintain insurance required by (and consistent
    with the requirements of) the Improvements Lease prior to the Base Rent
    Commencement Date, and costs of repairing any damage to the Improvements by
    fire or other casualty prior to the Base Rent Commencement Date, to the
    extent such cost is not covered by insurance proceeds made available to NAI
    as provided in the Improvements Lease;


Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 22
<PAGE>   79

        (c) a fraction of the cost of any title insurance policy or binder
    provided to BNPLC in connection with its acquisition of the Land and
    Improvements, the numerator of which fraction is the difference computed by
    subtracting the price paid by BNPLC for the Land from the maximum dollar
    amount of coverage provided by the title insurance, and the denominator of
    which fraction is equal to such maximum dollar amount of coverage;

        (d) Impositions that have accrued or become due under the Improvements
    Lease prior to the Base Rent Commencement Date; and

        (e) cancellation or termination fees or other compensation payable by
    NAI or BNPLC pursuant to any contract concerning the Construction Project
    made by NAI or BNPLC with any general contractor, architect, engineer or
    other third party because of any election by NAI or BNPLC to cancel or
    terminate such contract.

Project Costs will include costs incurred by BNPLC to continue or complete the
Construction Project after any Landlord's Election to Continue Construction as
provided in subparagraph 6.(e) of the Improvements Lease.

        "PROJECTED COST OVERRUNS" shall have the meaning assigned to it in
subparagraph 4(A) of the Construction Management Agreement.

        "PROPERTY" means the Personal Property and the Real Property,
collectively. Except to the extent covered by the Other Lease Agreement, all
rights, titles and interests acquired by BNPLC under the Existing Contract are
intended to be encompassed within the term "Property" as such term is used in
the Operative Documents.

       "PURCHASE AGREEMENT " means the Purchase Agreement (Phase II -
Improvements) dated as of May 3, 1999 between BNPLC and NAI, as such Purchase
Agreement may be extended, supplemented, amended, restated or otherwise modified
from time to time in accordance with its terms.

        "PURCHASE DOCUMENTS" means collectively (1) the Purchase Agreement, (2)
the Memorandum of Purchase Agreement executed by BNPLC and NAI as of the
Effective Date and recorded to provide notice of the Purchase Agreement; and (3)
the Pledge Agreement and all financing statements, notices, acknowledgments and
certificates of deposit executed or delivered from time to time by NAI, BNPLC or
the other parties to the Pledge Agreement pursuant to and as expressly provided
therein.

        "PURCHASE OPTION" shall have the meaning assigned to it in subparagraph
1(A)(1) of the Purchase Agreement.

        "QUALIFIED AFFILIATE" means any Person that is one hundred percent
(100%) owned, directly or indirectly, by Banque Nationale de Paris or any
successor of such bank; provided, that such Person can make (and has in writing
made) the same representations to NAI that BNPLC has made in Paragraphs 3(D) and
3(E) of the Closing Certificate; and, provided, further, that such Person is not
insolvent.

        "QUALIFIED PREPAYMENTS" means (A) any Issue 97-10 Prepayments received
by BNPLC, (B) any Voluntary NAI Construction Contributions received by BNPLC
pursuant to subparagraph 4(C) of the Construction Management Agreement, and (C)
any payments received by BNPLC from time to time during the Term (1) under any
property insurance policy as a result of damage to the Property, (2) as
compensation for any restriction placed upon the use or development of the
Property or for the condemnation of the Property or any portion thereof, (3)
because of any judgment, decree or award for injury or damage to the Property or
(4) under any title insurance policy or otherwise as a result of any title
defect or claimed title defect


Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 23
<PAGE>   80
with respect to the Property; provided, however, that (x) in determining the
amount of "Qualified Prepayments", there shall be deducted all expenses and
costs of every kind, type and nature (including taxes, Breakage Costs and
Attorneys' Fees) incurred by BNPLC with respect to the collection or application
of such payments, (y) "Qualified Prepayments" shall not include any payment to
BNPLC by a Participant or an Affiliate of BNPLC that is made to compensate BNPLC
for the Participant's or Affiliate's share of any Losses BNPLC may incur as a
result of any of the events described in the preceding clauses (1) through (4)
and (z) "Qualified Prepayments" shall not include any payments received by BNPLC
that BNPLC has paid or is obligated to pay to NAI for the restoration or repair
of the Property or that BNPLC is holding as Escrowed Proceeds pursuant to
Paragraph 10 of the Improvements Lease or any other provision of the
Improvements Lease. For purposes of computing the total Qualified Prepayments
(and other amounts dependent upon Qualified Prepayments, such as Stipulated Loss
Value and the Outstanding Construction Allowance) paid to or received by BNPLC
as of any date, payments described in the preceding clauses (1) through (4) will
be considered as Escrowed Proceeds, not Qualified Prepayments, until they are
actually applied as Qualified Prepayments by BNPLC as provided in the Paragraph
of the Improvements Lease.

       "REAL PROPERTY " shall have the meaning assigned to it on page of the
Improvements Lease.

        "REIMBURSABLE CONSTRUCTION-PERIOD COSTS" shall have the meaning
assigned to it in Paragraph 2 of the Construction Management Agreement.

        "REMEDIAL WORK" means any investigation, monitoring, clean-up,
containment, remediation, removal, payment of response costs, or restoration
work and the preparation and implementation of any closure or other required
remedial plans that any governmental agency or political subdivision requires or
approves (or could reasonably be expected to require if it was aware of all
relevant circumstances concerning the Property), whether by judicial order or
otherwise, because of the presence of or suspected presence of Hazardous
Substances in, on, under or about the Property or because of any prior Hazardous
Substance Activity. Without limiting the generality of the foregoing, Remedial
Work also means any obligations imposed upon or undertaken by NAI pursuant to
Development Documents or any recommendations or proposals made therein.

        "RENT" means the Base Rent and all Additional Rent.

        "RESIDUAL RISK PERCENTAGE" means fifteen percent (15%).

        "RESPONSIBLE FINANCIAL OFFICER" means the chief financial officer, the
controller, the treasurer or the assistant treasurer of NAI.

        "SALE CLOSING DOCUMENTS" shall have the meaning assigned to it in
subparagraph 1(C) of the Purchase Agreement.

        "SCOPE CHANGE" shall have the meaning assigned to it in subparagraph
1(A)(1)(b) of the Construction Management Agreement.

        "SECURED SPREAD" means thirty basis points (30/100 of 1%); provided,
however, that for purposes of calculating the Base Rent for any Mandatory
Collateral Period, the Secured Spread shall equal one-half of the Unsecured
Spread for the same period.

        "SELLER" means Martin/Crossman, LLC, a California limited liability
company.


Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 24
<PAGE>   81

        "STIPULATED LOSS VALUE" as of any date means the amount equal to the
sum of the Initial Funding Advance, plus the sum of all Construction Advances
and Carrying Costs added to the Outstanding Construction Allowance on or prior
to such date, minus all funds actually received by BNPLC and applied as
Qualified Prepayments on or prior to such date. Under no circumstances will any
payment of Base Rent, the Arrangement Fee, any Upfront Syndication Fees,
Administrative Agency Fees or Commitment Fees reduce Stipulated Loss Value.

        "SUBSIDIARY" means, with respect to any Person, any Affiliate of which
at least a majority of the securities or other ownership interests having
ordinary voting power then exercisable for the election of directors or other
persons performing similar functions are at the time owned directly or
indirectly by such Person.

        "SUPPLEMENTAL PAYMENT" shall have the meaning assigned to it in
subparagraph 1(A)(2)(c) of the Purchase Agreement.

        "TERM" shall have the meaning assigned to it in subparagraph 1.(a) of
the Improvements Lease.

        "THIRD PARTY CONTRACT" shall have the meaning assigned to it in
subparagraph 1(A)(2)(b) of the Construction Management Agreement.

        "THIRD PARTY PRICE" shall have the meaning assigned to it in
subparagraph 1(A)(2) of the Purchase Agreement.

        "THIRD PARTY SALE NOTICE" shall have the meaning assigned to it in
subparagraph 2(C) of the Purchase Agreement.

        "THIRD PARTY SALE PROPOSAL" shall have the meaning assigned to it in
subparagraph 2(C) of the Purchase Agreement.

        "THIRD PARTY TARGET PRICE" shall have the meaning assigned to it in
subparagraph 2(C) of the Purchase Agreement.

        "TRANSACTION EXPENSES" means costs incurred in connection with the
preparation and negotiation of the Operative Documents and related documents and
the consummation of the transactions contemplated therein.

        "UNFUNDED BENEFIT LIABILITIES" means, with respect to any Plan or
Multiemployer Plan, the amount (if any) by which the present value of all
benefit liabilities (within the meaning of Section 4001(a)(16) of ERISA) under
the Plan or Multiemployer Plan exceeds the market value of all Plan or
Multiemployer assets allocable to such benefit liabilities, as determined on the
most recent valuation date of the Plan or Multiemployer Plan and in accordance
with the provisions of ERISA for calculating the potential liability of NAI or
any ERISA Affiliate of NAI under Title IV of ERISA.

        "UPFRONT SYNDICATION FEES" shall have the meaning assigned to it in
subparagraph 2(M) of the Closing Certificate and Agreement.

        "UNSECURED SPREAD" means, for each Construction Period or any period
beginning on and including the Base Rent Commencement Date or a Base Rent Date
and ending on but not including the next Base Rent Date, the amount established
as described below in this definition on the date (in this definition, the
"SPREAD TEST DATE") that is two Business Days prior to such period by reference
to the ratio calculated by dividing (1) Adjusted EBIT for the then latest
Rolling Four Quarters Period that ended prior to (and for which NAI has reported
earnings as necessary to compute Adjusted EBIT) into (2) the total Debt of


Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 25
<PAGE>   82

NAI and its Subsidiaries (determined on a consolidated basis) as of the end of
such Rolling Four Quarters Period. The Unsecured Spread shall be established at
the Level in the pricing grid below which corresponds to such ratio; provided,
that:

        (a) for any period commencing on or prior to the first Business Day of
    August, 1999, the Unsecured Spread will be the amount indicated for Level
    III in the pricing grid below;

        (b) promptly after earnings are reported by NAI for the latest quarter
    in any Rolling Four Quarters Period, NAI must notify BNPLC of any resulting
    change in the Unsecured Spread under this definition, and no reduction in
    the Unsecured Spread from one period to the next will be effective for
    purposes of the Operative Documents unless, prior to the Spread Test Date
    for the next period, NAI shall have provided BNPLC with a written notice
    setting forth and certifying the calculation under this definition that
    justifies the reduction; and

        (c) notwithstanding anything to the contrary in this definition, on any
    date when an Event of Default has occurred and is continuing, the Unsecured
    Spread shall equal the Default Rate less the Effective Rate.



         LEVELS           RATIO OF TOTAL DEBT TO ADJUSTED EBIT            UNSECURED SPREAD
      --------------      ------------------------------------          -------------------
                                                          
        Level I                      less than 0.5                       125.0 basis points

        Level II           greater than or equal to 0.5, but             137.5 basis points
                                     less than 1.0

       Level III           greater than or equal to 1.0, but             150.0 basis points
                                     less than 1.5

        Level IV           greater than or equal to 1.5, but             175.0 basis points
                                     less than 2.0

        Level V               greater than or equal to 2.0               200.0 basis points


All determinations of the Unsecured Spread by BNPLC shall, in the absence of
clear and demonstrable error, be binding and conclusive for purposes of the
Improvements Lease. Further BNPLC may, but shall not be required, to rely on the
determination of the Unsecured Spread set forth in any notice delivered by NAI
as described above in clause (b) of this definition.

        "VOLUNTARY NAI CONSTRUCTION CONTRIBUTIONS" shall have the meaning
assigned to it in subparagraph 4(C) of the Construction Management Agreement.

        "VOLUNTARY RETENTION OF THE PROPERTY" means an affirmative election
made by BNPLC to keep the Property pursuant to, and under the circumstances
described in, the second sentence of subparagraph 1(A)(2)(a) of the Purchase
Agreement.

        "WORK" shall have the meaning assigned to it in subparagraph 1(A)(2)(a)
of the Construction Management Agreement.


Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 26

<PAGE>   83
                      ARTICLE II - RULES OF INTERPRETATION

        THE FOLLOWING PROVISIONS WILL APPLY TO AND GOVERN THE INTERPRETATION OF
EACH OF THE OPERATIVE DOCUMENTS:

1 NOTICES. The provision of any Operative Document, or of any Applicable Laws
with reference to the sending, mailing or delivery of any notice or demand under
any Operative Document or with reference to the making of any payment required
under any Operative Document, shall be deemed to be complied with when and if
the following steps are taken:

    (i) All Rent and other amounts required to be paid by NAI to BNPLC shall be
    paid to BNPLC in immediately available funds by wire transfer to:

               Federal Reserve Bank of New York
               ABA  026007689 Banque Nationale de Paris
               /BNP/ BNP San Francisco
               /AC/ 14334000176
               /Ref/ NAI Sunnyvale Synthetic Improvements Lease

    or at such other place and in such other manner as BNPLC may designate in a
notice to NAI.

    (ii) All Collateral required to be paid by NAI to the Agent shall be paid in
    immediately available funds by wire transfer to:

               Federal Reserve Bank of New York
               ABA  026007689 Banque Nationale de Paris
               /BNP/ BNP San Francisco
               /AC/ 14334000176
               /Ref/ NAI Collateral Payment

    or at such other place and in such other manner as Agent may designate in a
notice to NAI.

    (iii) All advances paid to NAI by BNPLC under the Construction Management
    Agreement or in connection therewith shall be paid to NAI in immediately
    available funds at such place and in such manner as NAI may reasonably
    designate from time to time by notice to BNPLC signed by a Responsible
    Financial Officer of NAI.

    (iv) All notices, demands, approvals, consents and other communications to
    be made under any Operative Document to or by the parties thereto must, to
    be effective for purpose of such Operative Document, be in writing. Notices,
    demands and other communications required or permitted under any Operative
    Document are to be sent to the addresses set forth below (or in the case of
    communications to Participants, at the addresses set forth in Schedule 1 to
    the Participation Agreement) and shall be given by any of the following
    means: (A) personal service, with proof of delivery or attempted delivery
    retained; (B) electronic communication, whether by telex, telegram or
    telecopying (if confirmed in writing sent by United States first class mail,
    return receipt requested); or (C) registered or certified first class mail,
    return receipt requested. Such addresses may be changed by notice to the
    other parties given in the same manner as provided above. Any notice or
    other communication sent pursuant to clause (A) or (B) hereof shall be
    deemed received upon such personal service or upon dispatch by electronic
    means, and, if sent pursuant to clause (C) shall be deemed received five
    days following deposit in the mail.


Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 27
<PAGE>   84

                    Address of BNPLC:

                    BNP Leasing Corporation
                    12201 Merit Drive
                    Suite 860
                    Dallas, Texas 75251
                    Attention: Lloyd G. Cox
                    Telecopy: (972) 788-9191

                    With a copy to:

                    Banque Nationale de Paris, San Francisco
                    180 Montgomery Street
                    San Francisco, California 94104
                    Attention: Gavin Holles
                    Telecopy: (415) 296-8954

                    And for draw requests and funding notices, with a copy to:

                    Banque Nationale de Paris, San Francisco
                    180 Montgomery Street
                    San Francisco, California 94104
                    Attention: George Fung
                    Telecopy: (415) 296-8954

                    Address of NAI:

                    Network Appliance, Inc.
                    Attn: Leslie Paulides
                    2770 San Thomas Expressway
                    Santa Clara, CA 95051
                    Telecopy: (408) 367-3452

2 SEVERABILITY. If any term or provision of any Operative Document or the
application thereof shall to any extent be held by a court of competent
jurisdiction to be invalid and unenforceable, the remainder of such document, or
the application of such term or provision other than to the extent to which it
is invalid or unenforceable, shall not be affected thereby.


3 NO MERGER. There shall be no merger of the Improvements Lease or of the
leasehold estate created by the Improvements Lease with any other interest in
the Property by reason of the fact that the same person may acquire or hold,
directly or indirectly, the Improvements Lease or the leasehold estate created
hereby and any other interest in the Property, unless all Persons with an
interest in the Property that would be adversely affected by any such merger
specifically agree in writing that such a merger shall occur. There shall be no
merger of the Purchase Agreement or of the purchase options or


Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 28
<PAGE>   85

obligations created by the Purchase Agreement with any other interest in the
Property by reason of the fact that the same person may acquire or hold,
directly or indirectly, the Improvements Lease or the leasehold estate created
hereby and any other interest in the Property, unless all Persons with an
interest in the Property that would be adversely affected by any such merger
specifically agree in writing that such a merger shall occur.


4 NO IMPLIED WAIVER. The failure of BNPLC or NAI to insist at any time upon the
strict performance of any covenant or agreement or to exercise any option,
right, power or remedy contained in any Operative Document shall not be
construed as a waiver or a relinquishment thereof for the future. The failure of
Agent to insist at any time upon the strict performance of any covenant or
agreement or to exercise any option, right, power or remedy contained in the
Pledge Agreement shall not be construed as a waiver or a relinquishment thereof
for the future. The waiver of or redress for any breach of any Operative
Document by any party thereto shall not prevent a similar subsequent act from
constituting a violation. Any express waiver of any provision of any Operative
Document shall affect only the term or condition specified in such waiver and
only for the time and in the manner specifically stated therein. No waiver by
any party to any Operative Document of any provision therein shall be deemed to
have been made unless expressed in writing and signed by the party to be bound
by the waiver. A receipt by BNPLC of any Rent with knowledge of the breach by
NAI of any covenant or agreement contained in the Improvements Lease or any
other Operative Document shall not be deemed a waiver of such breach. A receipt
by Agent of any Collateral or other payment under the Pledge Agreement with
knowledge of the breach by NAI of any covenant or agreement contained in the
Pledge Agreement shall not be deemed a waiver of such breach.


5 ENTIRE AND ONLY AGREEMENTS. The Operative Documents supersede any prior
negotiations and agreements between BNPLC, Agent and NAI concerning the Property
or the Collateral, and no amendment or modification of any Operative Document
shall be binding or valid unless expressed in a writing executed by all parties
to such Operative Document.

6 BINDING EFFECT. Except to the extent, if any, expressly provided to the
contrary in any Operative Document with respect to assignments thereof, all of
the covenants, agreements, terms and conditions to be observed and performed by
the parties to the Operative Documents shall be applicable to and binding upon
their respective successors and, to the extent assignment is permitted
thereunder, their respective assigns.

7 TIME IS OF THE ESSENCE. Time is of the essence as to all obligations of NAI
and BNPLC and all notices required of NAI and BNPLC under the Operative
Documents.

8 GOVERNING LAW. Each Operative Document shall be governed by and construed in
accordance with the laws of the State of California without regard to conflict
or choice of laws (subject, however, in the case of the Pledge Agreement to any
contrary provisions of the "UCC," as defined in the Pledge Agreement).

9 PARAGRAPH HEADINGS. The paragraph and section headings contained in the
Operative Documents are for convenience only and shall in no way enlarge or
limit the scope or meaning of the various and several provisions thereof.

10 NEGOTIATED DOCUMENTS. All the parties to each Operative Document and their
counsel have reviewed and revised or requested revisions to such Operative
Document, and the usual rule of construction that any ambiguities are to be
resolved against the drafting party shall not apply to the construction or
interpretation of any Operative Documents or any amendments thereof.

Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 29
<PAGE>   86

11 TERMS NOT EXPRESSLY DEFINED IN AN OPERATIVE DOCUMENT. As used in any
Operative Document, a capitalized term that is not defined therein or in this
Common Definitions and Provisions Agreement (Phase II - Improvements), but is
defined in another Operative Document, shall have the meaning ascribed to it in
the other Operative Document.

12 OTHER TERMS AND REFERENCES. Words of any gender used in each Operative
Document shall be held and construed to include any other gender, and words in
the singular number shall be held to include the plural and vice versa, unless
the context otherwise requires. References in any Operative Document to
Paragraphs, subparagraphs, Sections, subsections or other subdivisions shall
refer to the corresponding Paragraphs, subparagraphs, Sections, subsections or
subdivisions of that Operative Document, unless specific reference is made to
another document or instrument. References in any Operative Document to any
Schedule or Exhibit shall refer to the corresponding Schedule or Exhibit
attached to that Operative Document, which shall be made a part thereof by such
reference. All capitalized terms used in each Operative Document which refer to
other documents shall be deemed to refer to such other documents as they may be
renewed, extended, supplemented, amended or otherwise modified from time to
time, provided such documents are not renewed, extended or modified in breach of
any provision contained in the Operative Documents or, in the case of any other
document to which BNPLC is a party or of which BNPLC is an intended beneficiary,
without the consent of BNPLC. All accounting terms used but not specifically
defined in any Operative Document shall be construed in accordance with GAAP.
The words "this [Agreement]", "herein", "hereof", "hereby", "hereunder" and
words of similar import when used in each Operative Document refer to that
Operative Document as a whole and not to any particular subdivision unless
expressly so limited. The phrases "this Paragraph", "this subparagraph", "this
Section", "this subsection" and similar phrases used in any operative document
refer only to the Paragraph, subparagraph, Section, subsection or other
subdivision described in which the phrase occurs. As used in the Operative
Documents the word "or" is not exclusive. As used in the Operative Documents,
the words "include", "including" and similar terms shall be construed as if
followed by "without limitation to".

13 EXECUTION IN COUNTERPARTS. To facilitate execution, each Operative Document
may be executed in as many identical counterparts as may be required. It shall
not be necessary that the signature of, or on behalf of, each party, or that the
signature of all persons required to bind any party, appear on each counterpart.
All counterparts, taken together, shall collectively constitute a single
instrument. It shall not be necessary in making proof of any Operative Document
to produce or account for more than a single counterpart containing the
respective signatures of, or on behalf of, each of the parties hereto. Any
signature page to any counterpart may be detached from such counterpart without
impairing the legal effect of the signatures thereon and thereafter attached to
another counterpart identical thereto except having attached to it additional
signature pages.

14 NOT A PARTNERSHIP, ETC. NOTHING IN ANY OPERATIVE DOCUMENT IS INTENDED TO
CREATE ANY PARTNERSHIP, JOINT VENTURE, OR OTHER JOINT ENTERPRISE BETWEEN BNPLC
AND NAI. NEITHER THE EXECUTION OF ANY OPERATIVE DOCUMENT NOR THE ADMINISTRATION
THEREOF OR OTHER DOCUMENTS REFERENCED HEREIN BY BNPLC, NOR ANY OTHER RIGHT, DUTY
OR OBLIGATION OF BNPLC UNDER OR PURSUANT TO ANY OPERATIVE DOCUMENT IS INTENDED
TO BE OR TO CREATE ANY FIDUCIARY OBLIGATIONS OF BNPLC TO NAI.



                         [The signature pages follows.]


Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 30
<PAGE>   87

        IN WITNESS WHEREOF, NAI and BNPLC have caused this Common Definitions
and Provisions Agreement

                                      "NAI"

                                       NETWORK APPLIANCE, INC.

                                       By:
                                           -------------------------------------
                                           Name:
                                                 -------------------------------
                                           Title:
                                                 -------------------------------


Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 31
<PAGE>   88

[Continuation of signature pages to Common Definitions and Provisions Agreement
(Phase II - Improvements) dated to be effective May 3, 1999]

                                     "BNPLC"

                                      BNP LEASING CORPORATION

                                       By:
                                           -------------------------------------
                                           Lloyd G. Cox, Vice President


Common Definitions and Provisions Agreement (Phase II - Improvements) - Page 32