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     Lease between Scient and Pembroke Real Estate, Inc. dated May 1, 1999
<PAGE>
 
                               TABLE OF CONTENTS
                               -----------------
 
                                                                Page
                                                                ----
DEFINITIONS AND BASIC PROVISIONS..............................    1

LEASE GRANT...................................................    1

TERM..........................................................    1
  Term........................................................    1
  ----    

RENT..........................................................    1
   (a)    Payment.............................................    1
          -------
   (b)    Consumer Price Index Increases to Basic Rental......    1
          ----------------------------------------------
   (c)    Electrical Costs....................................    1
          ----------------
   (d)    Annual Cost Statement...............................    1
          ---------------------
   (e)    Adjustments to Electrical Costs.....................    1
          -------------------------------
 
DELINQUENT PAYMENT; HANDLING CHARGES..........................    2

SECURITY DEPOSIT..............................................    2
 
LANDLORD'S OBLIGATIONS........................................    2
   (a)    Services............................................    2
          --------
   (b)    Excess Utility Use..................................    3
          ------------------
   (c)    Discontinuance......................................    3
          --------------
   (d)    Restoration of Services.............................    4
          -----------------------
   (e)    Abatement...........................................    4
          ---------
   (f)    Restoration Costs...................................    4
          -----------------
  
IMPROVEMENTS; ALTERATIONS; REPAIRS; MAINTENANCE...............    5
   (a)    Improvements; Alterations...........................    5
          -------------------------
   (b)    Repairs; Maintenance................................    6
          --------------------
   (c)    Performance of Work.................................    6
          -------------------
   (d)    Mechanic's Liens....................................    6
          ----------------
 
USE...........................................................    6

ASSIGNMENT AND SUBLETTING.....................................    7
   (a)    Transfers; Consent..................................    7
          ------------------
   (b)    Cancellation........................................    8
          ------------
   (c)    Additional Compensation.............................    8
          -----------------------
   (d)    Transfer Restrictions...............................    8
          ---------------------
   (e)    Bankruptcy Provisions...............................    9
          ---------------------
   (f)    Withholding of Consent..............................   10
          ----------------------
   (g)    Transfer Without Landlord Consent...................   11
          ---------------------------------
   (h)    Miscellaneous.......................................   12
          -------------
 
INSURANCE; WAIVERS; SUBROGATION; INDEMNITY....................   12
   (a)    Insurance...........................................   12
          ---------
   (b)    Waiver of Negligence Claims No Subrogation..........   13
          ------------------------------------------
   (c)    Indemnity...........................................   14
          ---------
   (d)    Miscellaneous.......................................   14
          -------------
   (e)    Landlord Indemnity..................................   14
          ------------------
 
SUBORDINATION ATTORNMENT; NOTICE TO LANDLORD'S MORTGAGEE......   15
   (a)    Subordination.......................................   15
          -------------
   (b)    Attornment..........................................   15
          ----------
   (c)    Notice to Landlord's Mortgagee.......................  15
          ------------------------------
   (d)    Non-Disturbance Agreement from Current Landlord's
          -------------------------------------------------    
          Mortgagee...........................................   15
          ---------
 
RULES AND REGULATIONS.........................................   16

CONDEMNATION..................................................   16
   (a)    Taking - Landlord's and Tenant's Rights.............   16
          ---------------------------------------
   (b)    Taking - Landlord's Rights..........................   16
          --------------------------


                                      -i-
<PAGE>
 
   (c)    Award...............................................   16
          -----    

FIRE OR OTHER CASUALTY........................................   10
   (a)    Repair Estimate.....................................   16
          ---------------
   (b)    Landlord's and Tenant's Rights......................   16
          -------------------------------
   (c)    Landlord's Rights...................................   17
          -----------------
   (d)    Repair Obligation...................................   17
          -----------------
 
TAXES.........................................................   17

EVENTS OF DEFAULT.............................................   18

REMEDIES......................................................   18
 
PAYMENT BY TENANT; NON-WAIVER.................................   19
   (a)    Payment by Tenant...................................   19
          -----------------
   (b)    No Waiver...........................................   19
          ---------

LANDLORD'S LIEN...............................................   19
 
SURRENDER OF PREMISES.........................................   19

HOLDING OVER..................................................   20

CERTAIN RIGHTS RESERVED BY LANDLORD...........................   20

SUBSTITUTION SPACE............................................   21
 
MISCELLANEOUS.................................................   22
   (a)    Landlord Transfer...................................   22
          -----------------
   (b)    Landlord's Liability................................   22
          --------------------
   (c)    Force Majeure.......................................   22
          -------------
   (d)    Brokerage...........................................   22
          ---------
   (e)    Estoppel Certificates...............................   23
          ---------------------
   (f)    Notices.............................................   23
          -------
   (g)    Separability; Gender and Number.....................   23
          -------------------------------
   (h)    Amendments; and Binding Effect......................   23
          -------------------------------
   (i)    Quiet Enjoyment.....................................   23
          ---------------
   (j)    Joint and Several Liability.........................   23
          ---------------------------
   (k)    Captions............................................   24
          --------
   (1)    No Merger...........................................   24
          ---------
   (m)    Landlord Consent....................................   24
          ----------------
   (n)    No Offer............................................   24
          --------
   (o)    Exhibits............................................   24
          --------
   (p)    Entire Agreement....................................   24
          ----------------
   (q)    Governing Law.......................................   25
          -------------
   (r)    Financial Reports...................................   25
          -----------------
   (s)    Abandonment.........................................   25
          -----------
   (t)    Signs...............................................   26
          -----
 
SPECIAL PROVISIONS............................................   26


                                     -ii-
<PAGE>
 
                                     LEASE
                                        


     THIS LEASE AGREEMENT (this "Lease") is entered into as of May 1, 1999,
                                 -----                                     
between PEMBROKE REAL ESTATE, INC. ("Landlord"), and SCIENT CORPORATION, a
                                     --------                             
California corporation ("Tenant").
                         ------   

DEFINITIONS AND          1.   The definitions and basic provisions set forth in
BASIC PROVISIONS    the foregoing Basic Lease Information (the "Basic Lease
                                                                -----------
                    Information") executed by Landlord and Tenant
                    -----------                                  
                    contemporaneously herewith are incorporated herein by
                    reference for all purposes.

LEASE GRANT              2.   Subject to the terms of this Lease, Landlord
                    leases to Tenant, and Tenant leases from Landlord, the
                    Premises.

TERM                     3.   Term. Possession of the Initial Premises during 
                              ----
                    the Term shall be as follows:

                           RSF       Floor  Monthly Rental Rate       Term
                      ----------------------------------------------------------
                      5,000-10,000*   3rd          Free           5/1/99-6/30/99
                         11,422       3rd          Free          7/1/99-12/31/99
                         11,423       3rd       $23.50 + E       7/1/99-12/31/99
                         22,845       3rd       $23.50 + E       1/1/00-12/31/04
 
     *Location on the 3rd floor of the Building and actual rentable square feet
to be determined at a later date.



RENT                     4.   (a)  Payment. Tenant shall timely pay to Landlord
                                   -------                                     
                    the Basic Rental and all additional sums to be paid by
                    Tenant to Landlord under this Lease, including the amounts
                    set forth in Exhibit C, without deduction or set off, at
                                 ---------                                  
                    Landlord's Address (or such other address as Landlord may
                    from time to time designate in writing to Tenant). Basic
                    Rental, adjusted as herein provided, shall be payable
                    monthly in advance. The third monthly installment of Basic
                    Rental shall be payable contemporaneously with the execution
                    of this Lease; thereafter, monthly installments of Basic
                    Rental shall be due on the first day of the fourth full
                    calendar month of the Term and continuing on the first day
                    of each succeeding calendar month during the Term. Basic
                    Rental for any fractional month at the beginning of the Term
                    shall be prorated based on 1/365ths of the current annual
                    Basic Rental for each day of the partial month this Lease is
                    in effect, and shall be due on the Commencement Date.

                              (b) Consumer Price Index Increases to Basic
                                  ---------------------------------------
                    Rental. Intentionally deleted.
                    ------


                              (c) Electrical Costs. Tenant shall pay to Landlord
                                  ----------------                              
                    an amount equal to the product of (1) the cost of all
                    electricity used by the Building ("Electrical Costs"),
                                                       ----------------
                    multiplied by (2) Tenant's Proportionate Share. Such amount
                    shall be payable monthly based on Landlord's estimate of the
                    amount due for each month, and shall be due on the
                    Commencement Date and on the first day of each calendar
                    month thereafter unless Landlord has theretofore furnished
                    Tenant with information indicating the amount due, in which
                    event such amount shall be due within thirty (30) days after
                    Landlord has delivered to Tenant an invoice therefor.
                    Landlord reserves the right to change the manner in which
                    electricity at the Building is metered.

                              (d) Annual Cost Statement. By April 1 of each
                                  ---------------------                    
                    calendar year, or as soon thereafter as practicable,
                    Landlord shall furnish to Tenant a statement of Landlord's
                    actual Electrical Costs (the "Annual Cost Statement") for
                                                  ---------------------      
                    the previous year adjusted as provided in Section 4.(e). If
                    the Annual Cost Statement reveals that Tenant paid more for
                    Electrical Costs than Tenant's Proportionate Share of
                    Electrical Costs in the year for which such statement was
                    prepared, then Landlord shall reimburse or credit Tenant for
                    such excess within 30 days after delivery of the Annual Cost
                    Statement in question; likewise, if Tenant paid less than
                    Tenant's Proportionate Share of Electrical Costs, then
                    Tenant shall pay Landlord such deficiency within 30 days
                    after delivery of the Annual Cost Statement in question.



                              (e) Adjustments to Electrical Costs. With respect
                                  -------------------------------              
                    to any calendar year or partial calendar year in which the
                    Building is not occupied to the extent of 100% of the
                    rentable area thereof, the Electrical Costs for such period
                    shall, for the purposes hereof, be increased to the amount
                    which would have been

                                       1
<PAGE>
 
                    incurred had the Building been occupied to the extent of
                    100% of the rentable area thereof, and Tenant shall
                    thereafter pay to Landlord an amount equal to the product of
                    (1) such amount of Electrical Costs, multiplied by (2)
                    Tenant's Proportionate Share.

DELINQUENT               5.   All payments required of Tenant hereunder shall
PAYMENT             bear interest from the date due until paid at the maximum
HANDLING CHARGES    lawful rate in effect at the time such payment was due or
                    sum was advanced, or if there is no ascertainable maximum
                    lawful rate then in effect, at a rate of five percent (5%)
                    in excess of the floating prime or base rate of interest
                    established from time to time for responsible commercial
                    borrowers by a national bank selected by Landlord. Landlord
                    hereby notifies Tenant that for purposes of TEX. REV. CIV.
                    STAT. ANN. Art. 5069-1.04, as it may from time to time be
                    amended, the "applicable rate ceiling" shall be the
                    "indicated rate" ceiling; provided, however, that, to the
                    extent permitted by applicable law, Landlord reserves the
                    right to change the "applicable rate ceiling" from time to
                    time by further notice and disclosure to Tenant. Tenant
                    agrees that such interest is to compensate Landlord for
                    Tenant's use of Landlord's money after the applicable
                    payment was due. Additionally, Tenant shall pay to Landlord
                    as additional rent hereunder a late charge equal to 10% of
                    the delinquent payment; provided, however, Tenant shall have
                    no obligation to pay such late charge in connection with the
                    first payment of Rent (including, without limitation, Basic
                    Rental) due during any twelve (12) month period which is not
                    paid by Tenant on the date such payment was due but is paid
                    on or before the fifth (5th) day after such payment was due.
                    The parties hereto acknowledge and agree that (i) such late
                    charge represents a fair and reasonable estimate of the
                    costs Landlord will incur in processing any delinquent
                    payment by Tenant, (ii) such late charge shall be paid to
                    Landlord as liquidated damages for each payment not made by
                    Tenant as and when due under this Lease, and (iii) the
                    payment of such late charge is to compensate Landlord for
                    its cost and inconvenience incurred as a consequence of
                    Tenant's delinquency and for the additional administrative
                    expense incurred by Landlord or its managing agent in
                    handling and processing delinquent payments. In no event,
                    however, shall the charges permitted under this Section 5 or
                    elsewhere in this Lease, to the extent the same are
                    considered to be interest under applicable law, exceed the
                    maximum lawful rate of interest.

SECURITY DEPOSIT         6.   Contemporaneously with the execution of this
                    Lease, Tenant shall pay to Landlord, in immediately
                    available funds, the Security Deposit, which shall be held
                    by Landlord without liability for interest and as security
                    for the performance by Tenant of its obligations under this
                    Lease. The Security Deposit is not an advance payment of
                    Rent or a measure or limit of Landlord's damages upon an
                    Event of Default (defined below). Landlord may, from time to
                    time and without prejudice to any other remedy, use all or a
                    part of the Security Deposit to perform any obligation which
                    Tenant was obligated, but failed, to perform hereunder and
                    such failure has continued for a period of time equal to or
                    greater than five (5) days after Tenant's receipt of written
                    notice of its failure to perform any such obligation.
                    Following any such application of the Security Deposit,
                    Tenant shall pay to Landlord on demand the amount so applied
                    in order to restore the Security Deposit to its original
                    amount. Within a reasonable time after the Term ends,
                    provided Tenant has performed all of its obligations
                    hereunder, Landlord shall return to Tenant the balance of
                    the Security Deposit not applied to satisfy Tenant's
                    obligations. If Landlord transfers its interest in the
                    Premises, then Landlord may assign and deliver the Security
                    Deposit to the transferee and Landlord thereafter shall have
                    no further liability for the return of the Security Deposit.
                    
LANDLOARD'S              7.   (a)  Services. Provided no Event of Default exists
OBLIGATIONS                        --------                                     
                    and subject to any event beyond the reasonable control of
                    Landlord (including, without limitation, the events
                    described in Section 25.(c) below), Landlord will furnish to
                    Tenant (1) water (hot and cold) at those points of supply
                    provided for general use of tenants of the Building; (2)
                    heating, ventilation, and air-conditioning ("HVAC") as
                                                                 ----     
                    appropriate and at such times as Landlord normally furnishes
                    these services to all tenants of the Building, and at such
                    temperatures and in such amounts as are reasonably
                    considered by Landlord to be standard; (3)janitorial service
                    to the Premises on weekdays other than holidays for
                    Building-standard installations (Landlord reserves the right
                    to bill Tenant separately for extra janitorial service
                    required for non-standard installations) and such window
                    washing as may from time to time in Landlord's judgment be
                    reasonably required; (4) elevators for ingress and egress to
                    the floor on which the Premises are located,

                                       2
<PAGE>
 
                    in common with other tenants, provided that Landlord may
                    reasonably limit the number of elevators to be in operation
                    at times other than during customary business hours and on
                    holidays; (5) replacement of Building-standard light bulbs
                    and fluorescent tubes, provided that Landlord's standard
                    charge for such bulbs and tubes shall be paid by Tenant; and
                    (6) electrical current during normal business hours other
                    than for computers, electronic data processing equipment,
                    special lighting, equipment that requires more than 110
                    volts, or other equipment whose electrical energy
                    consumption exceeds normal office usage. Landlord shall
                    maintain the common areas of the Building in reasonably good
                    order and condition, except for damage occasioned by Tenant,
                    or its employees, agents or invitees. If Tenant desires any
                    of the services specified in this Section 7.(a) at any time
                    other than times herein designated (other than HVAC service
                    which is governed by the immediately following sentence),
                    such services shall be supplied to Tenant upon the written
                    request of Tenant delivered to Landlord before 3:00 p.m. on
                    the business day preceding such extra usage, and Tenant
                    shall, within thirty (30) days after Tenant's receipt of an
                    invoice therefor, pay to Landlord the cost of such services
                    together with an overhead charge equal to ten percent (10%)
                    of the actual cost of any such service. If Tenant desires
                    any HVAC service at any time other than the times herein
                    designated, such HVAC service shall be supplied to Tenant
                    upon the written request of Tenant delivered to Landlord
                    before 3:00 p.m. on the business day preceding such extra
                    usage, and Tenant shall, within thirty (30) days after
                    Tenant's receipt of an invoice therefor, pay to Landlord the
                    Initial After-Hours HVAC Charge, which Initial After-Hours
                    HVAC Charge is subject to change by Landlord if electrical
                    rates are increased by any provider of electricity or if
                    Landlord's costs to provide this service otherwise increase
                    after the Commencement Date.



                              (b) Excess Utility Use. Landlord shall use
                                  ------------------                    
                    reasonable efforts to furnish electrical current for
                    computers, electronic data processing equipment, special
                    lighting, equipment that requires more than 110 volts, or
                    other equipment whose electrical energy consumption exceeds
                    normal office usage through the then-existing feeders and
                    risers serving the Building and the Premises, and Tenant
                    shall pay to Landlord the cost of such service within thirty
                    (30) days after Landlord has delivered to Tenant an invoice
                    therefor. Landlord may determine the amount of such
                    additional consumption and potential consumption by either
                    or both: (1) a survey of standard or average tenant usage of
                    electricity in the Building performed by a reputable
                    consultant selected by Landlord and paid for by Tenant; or
                    (2) a separate meter in the Premises installed, maintained,
                    and read by Landlord, at Tenant's expense. Tenant shall not
                    install any electrical equipment requiring special wiring or
                    requiring voltage in excess of 110 volts or otherwise
                    exceeding Building capacity unless approved in advance by
                    Landlord. The use of electricity in the Premises shall not
                    exceed the capacity of existing feeders and risers to or
                    wiring in the Premises. Any risers or wiring required to
                    meet Tenant's excess electrical requirements shall, upon
                    Tenant's written request, be installed by Landlord, at
                    Tenant's cost, if, in Landlord's sole and absolute judgment,
                    the same are necessary and shall not cause permanent damage
                    or injury to the Building or the Premises, cause or create a
                    dangerous or hazardous condition, entail excessive or
                    unreasonable alterations, repairs, or expenses, or interfere
                    with or disturb other tenants of the Building. If Tenant
                    uses machines or equipment (other than general office
                    machines and personal computers, but excluding computer
                    rooms and electronic data processing equipment) in the
                    Premises which affect the temperature otherwise maintained
                    by the air conditioning system or otherwise overload any
                    utility, Landlord may install supplemental air conditioning
                    units or other supplemental equipment in the Premises, and
                    the cost thereof, including the cost of installation,
                    operation, use, and maintenance, shall be paid by Tenant to
                    Landlord within thirty (30) days after Landlord has
                    delivered to Tenant an invoice therefor.

                              (c) Discontinuance. Landlord's obligation to
                                  --------------                          
                    furnish services under Section 7.(a) shall be subject to the
                    rules and regulations of the supplier of such services and
                    governmental rules and regulations. Landlord may, upon not
                    less than 60-days' prior written notice to Tenant,
                    discontinue any such service to the Premises, provided
                    Landlord first arranges for a direct connection thereof
                    through the supplier of such service. Tenant shall, however,
                    be responsible for contracting with the supplier of such
                    service and for paying all deposits for, and costs relating
                    to, such service.

                              (d) Restoration of Services. Except as expressly
                                  -----------------------                     
                    provided

                                       3
<PAGE>
 
                    below, Landlord shall not be liable for, and Tenant shall
                    not be entitled to, any damages or termination right or any
                    abatement or reduction of rental by reason of Landlord's
                    failure to furnish any of the services (collectively, the
                    "Landlord Services") to be furnished by Landlord as provided
                     -----------------
                    above, nor shall such failure constitute a constructive
                    eviction of Tenant or breach of any implied warranty or
                    relieve Tenant from any obligation hereunder, whether such
                    failure is caused by accident, breakage, repairs, energy
                    shortages or restrictions, strikes, lockouts or other labor
                    disturbances or labor disputes of any character, riots,
                    civil disturbances or by any other cause, similar or
                    dissimilar, beyond the control of Landlord. Except as may be
                    limited by law, Landlord shall not be liable under any
                    circumstances for loss of or injury to property, however
                    occurring, through or in connection with or incidental to
                    failure to furnish any of the Landlord Services, nor shall
                    Landlord be responsible for any act or omission or
                    commission on the part of the person or persons employed to
                    furnish any of the Landlord Services. Notwithstanding
                    anything to the contrary contained in this Lease, Tenant
                    agrees that Landlord shall not be liable for, and Tenant
                    shall not be entitled to, any damages or any abatement or
                    reduction of rental by reason of Landlord's failure to
                    supply any of the Landlord Services during any period when
                    Landlord uses commercially reasonable efforts to supply such
                    services or the cause of such failure is beyond the control
                    of Landlord. After receiving notice of any interruption of
                    any of the Landlord Services, Landlord shall use
                    commercially reasonable efforts to restore any interrupted
                    or unavailable Landlord Services.

                              (e) Abatement. Subject to the provisions of the
                                  ---------                                  
                    preceding Section 7.(d), if a stoppage of any of the
                    Landlord Services causes a material portion of the Premises
                    to become untenantable by Tenant for more than ten (10)
                    consecutive business days after Tenant gives Landlord
                    written notice of such stoppage, then and in that event,
                    Tenant, as its sole and exclusive remedy therefor, shall be
                    entitled to a pro-rata abatement of Rent as to such
                    untenantable portion of the Premises commencing on the
                    eleventh (11th) consecutive business day that the same are
                    untenantable and continuing until the restoration of such
                    services. Notwithstanding the foregoing, however, Tenant
                    shall not be entitled to any abatement of Rent due to
                    untenantability (a) caused by an act or omission of Tenant
                    or any of Tenant's employees, agents, contractors, visitors
                    or licensees, or (b) where the stoppage of the Landlord
                    Services in question is caused by (1) fire or other casualty
                    in which case Section 15 shall apply, or (2) condemnation or
                    taking in which case Section 14 shall apply.



                              (f) Restoration Costs. If a stoppage (other than
                                  -----------------                           
                    any stoppage caused by an act or omission of Tenant or any
                    of Tenant's employees, agents, contractors, visitors or
                    licensees, any stoppage caused by fire or other casualty or
                    condemnation or taking, or any cause beyond the control of
                    Landlord) of any of the Landlord Services causes a material
                    portion of the Premises to become untenantable by Tenant for
                    more than thirty (30) consecutive days after Tenant gives
                    Landlord written notice of such stoppage, Tenant may
                    commence to restore the applicable Landlord Services unless
                    Landlord has begun taking action(s) to restore the
                    applicable Landlord Services and Landlord is continuing to
                    pursue the same with commercially reasonable diligence. All
                    actual third-party costs reasonably incurred by Tenant in
                    connection with restoring the applicable Landlord Services
                    ("Restoration Costs") shall, if not disputed by Landlord and
                      -----------------                                         
                    submitted to arbitration as provided below, be paid to
                    Tenant by Landlord within thirty (30) days following
                    Landlord's receipt of a written demand therefor together
                    with written evidence acceptable to Landlord of the amount
                    of such Restoration Costs. If Landlord disputes Landlord's
                    obligation to pay all or any portion of the Restoration
                    Costs set forth in any such written demand, Landlord may
                    dispute such costs and defer any payment of the same by
                    giving Tenant written notice thereof (a "Services Failure
                                                             ----------------
                    Dispute Notice") within ten (10) business days after
                    --------------                                      
                    Landlord's receipt of Tenant's written demand, and Landlord
                    and Tenant shall thereafter proceed to diligently and in
                    good faith attempt to resolve such dispute and, if the
                    parties are unable to resolve the same within sixty (60)
                    days after Tenant's receipt of the applicable Services
                    Failure Dispute Notice, such dispute shall be submitted for
                    resolution by binding arbitration in accordance with the
                    terms, conditions and provisions of the Exhibit K attached
                                                            ---------        
                    to this Lease. If Landlord does not so dispute Tenant's
                    claim for Restoration Costs and does not pay the same within
                    such thirty (30) day period, Tenant may offset such
                    Restoration Costs against up to twenty-five percent (25%) of
                    the next due installment(s) of Basic Rental until such time
                    as the full amount of such Restoration Costs has been
                    reimbursed unless the amount of such Restoration

                                       4
<PAGE>
 
                    Costs is equal to or greater than the entire amount of Basic
                    Rental due and payable for the six (6) calendar months
                    following the date on which such stoppage initially
                    occurred, in which case only that amount of such Restoration
                    Costs may be offset against such percentage of the next due
                    installment(s) of Basic Rental until such time as that
                    amount of the applicable Restoration Costs has been
                    reimbursed; provided, however, in no event shall such cap on
                    the amount of Restoration Costs to be offset against Basic
                    Rental relieve Landlord from its obligation to pay the
                    remaining amount of such non-disputed and/or arbitrated
                    Restoration Costs.

IMPROVEMENTS;            8.   (a)  Improvements Alterations. Improvements to the
ALTERATIONS;                       ------------------------                     
REPAIRS;            Premises shall be installed at the expense of Tenant only in
MAINTENANCE         accordance with plans and specifications which have been
                    previously submitted to and approved in writing by Landlord.
                    After the initial Tenant improvements are made (including,
                    without limitation, any leasehold improvements made in
                    connection with expansions by Tenant pursuant to the Exhibit
                    G attached hereto), no alterations or physical additions in
                    or to the Premises which individually cost more than
                    $5,000.00 or, together with the cost of all alterations or
                    physical additions made during the immediately preceding 12
                    month period, cost more than $10,000.00 in the aggregate may
                    be made without Landlord's prior written consent, which
                    consent will not be unreasonably withheld or delayed;
                    provided, however, that Landlord will be able to withhold
                    its consent, in its sole and absolute discretion, with
                    respect to any alterations or physical additions in or to
                    the Premises, regardless of cost, which (A) are made to or
                    affect (1)the structural components of the Building, or (2)
                    the systems of the Building, or (B) are visible from the
                    exterior of the Building. If requested in writing at the
                    time of Tenant's request for Landlord's written consent to
                    any proposed alterations or physical additions in or to the
                    Premises, Landlord will, if Landlord's consent to the same
                    is given, notify Tenant in writing whether Landlord will
                    require that Tenant remove such alterations or physical
                    additions at the expiration or earlier termination of this
                    Lease. Tenant shall not paint or install lighting or
                    decorations, signs, window or door lettering, or advertising
                    media of any type on or about the Premises without the prior
                    written consent of Landlord. All alterations, additions, or
                    improvements (whether temporary or permanent in character,
                    and including without limitation all air-conditioning
                    equipment and all other equipment that is in any manner
                    connected to the Building's plumbing system) made in or upon
                    the Premises, either by Landlord or Tenant, shall be
                    Landlord's property at the end of the Term and shall remain
                    on the Premises without compensation to Tenant. Approval by
                    Landlord of any of Tenant's drawings and plans and
                    specifications prepared in connection with any improvements
                    in the Premises shall not constitute a representation or
                    warranty of Landlord as to the adequacy or sufficiency of
                    such drawings, plans and specifications, or the improvements
                    to which they relate, for any use, purpose, or condition,
                    but such approval shall merely be the consent of Landlord as
                    required hereunder. Notwithstanding anything in this Lease
                    to the contrary, Tenant shall be responsible for the cost of
                    all work required to comply with the retrofit requirements
                    of any Disability Laws (as hereinafter defined) (including,
                    without limitation; the Americans with Disabilities Act of
                    1990, and all rules, regulations, and guidelines promulgated
                    thereunder, as the same may be amended from time to time)
                    necessitated by any installations, additions, or alterations
                    made in or to the Premises at the request of or by Tenant or
                    by Tenant's or any Permitted Transferee's (as defined in
                    Section 25.(s) below) use of the Premises (other than
                    retrofit work whose cost has been particularly identified as
                    being payable by Landlord in an instrument signed by
                    Landlord and Tenant), regardless of whether such cost is
                    incurred in connection with retrofit work required in the
                    Premises (including the Work described in Exhibit D) or in
                                                              ---------       
                    other areas of the Building. All changes, alterations or
                    modifications (other than changes, alterations or
                    modifications required [1] as a result of Tenant's or any
                    Permitted Transferee's particular use of all or any portion
                    of the Premises, and/or [2] to cause the Premises to comply
                    with all applicable Disability Laws which Tenant has agreed
                    to do in this Section 8), if any, necessary to make portions
                    of the Building (other than the Premises) comply with all
                    applicable Laws (including, without limitation, Disability
                    Laws) shall be the responsibility of Landlord; provided,
                    however, if such changes, alterations or modifications are
                    required as a result of Tenant's or any Permitted
                    Transferee's use of the Premises or any changes, alterations
                    or modifications made to the Premises by or on behalf of
                    Tenant, then the same shall be made by Landlord at the sole
                    cost and expense of Tenant. Landlord shall have the right to
                    delay making any of the changes, alterations and/or
                    modifications referred to in the immediately preceding
                    sentence while Landlord is contesting in good faith the
                    action or actions being taken by any

                                       5
<PAGE>
 
                    governmental authority in connection therewith. As used
                    in this Lease, the term "Disability Laws" shall mean the
                                             ---------------                
                    provisions of (i) Tex. Rev. Civ. Stat. Ann. art. 9102, as
                    amended, (ii) the Americans With Disabilities Act of 1990,
                    42 U.S.C. (S)(S)12101-12213, as amended, and (iii) any other
                    similar public accommodation Laws (as hereinafter defined).
                    As used herein, the term "Laws" shall mean all laws,
                                              ----                      
                    Statutes, ordinances, resolutions, rules, codes,
                    regulations, restrictions (including, without limitation,
                    restrictive covenants or deed restrictions), policies,
                    orders, determinations or requirements from time to time in
                    existence of any governmental authority.

                              (b) Repairs; Maintenance. Tenant shall maintain
                                  --------------------                       
                    the Premises in a clean, safe, operable, attractive
                    condition, and shall not permit or allow to remain any waste
                    or damage to any portion of the Premises. Tenant shall
                    repair or replace, subject to Landlord's direction and
                    supervision, any damage to the Building caused by Tenant or
                    Tenant's agents, contractors, or invitees. If Tenant fails
                    to make such repairs or replacements within 30 days after
                    the occurrence of such damage, then Landlord may make the
                    same at Tenant's cost. In lieu of having Tenant repair any
                    such damage outside of the Premises, Landlord may repair
                    such damage at Tenant's cost. The cost of any repair or
                    replacement work performed by Landlord under this Section 8
                    shall be paid by Tenant to Landlord within ten (10) days
                    after Landlord has delivered to Tenant an invoice therefor.

                              (c) Performance of Work. All work described in
                                  -------------------                       
                    this Section 8 shall be performed only by Landlord or by
                    contractors and subcontractors approved in writing by
                    Landlord. Landlord acknowledges that Equis Corporation is
                    involved in the management of the Work (as defined in the
                    Exhibit D attached to this Lease). Tenant shall cause all
                    contractors and subcontractors to procure and maintain
                    insurance coverage against such risks, in such amounts, and
                    with such companies as Landlord may reasonably require, and
                    to procure payment and performance bonds reasonably
                    satisfactory to Landlord covering the cost of the work. All
                    such work shall be performed in accordance with all legal
                    requirements and in a good and workmanlike manner so as not
                    to damage the Premises, the primary structure or structural
                    qualities of the Building, or plumbing, electrical lines, or
                    other utility transmission facility. All such work which may
                    affect the HVAC system, electrical system, or plumbing must
                    be approved by the Building's engineer of record.

                              (d) Mechanic's Liens. Tenant shall not permit any
                                  ----------------                             
                    mechanic's liens to be filed against the Premises or the
                    Building for any work performed, materials furnished, or
                    obligation incurred by or at the request of Tenant. If such
                    a lien is filed, then Tenant shall, within ten (10) business
                    days after Landlord has delivered notice of the filing to
                    Tenant, either pay the amount of the lien or diligently
                    contest such lien and deliver to Landlord a bond or other
                    security reasonably satisfactory to Landlord. If Tenant
                    fails to timely take either such action, then Landlord may
                    pay the lien claim without inquiry as to the validity
                    thereof, and any amounts so paid, including expenses and
                    interest, shall be paid by Tenant to Landlord within ten
                    (10) days after Landlord has delivered to Tenant an invoice
                    therefor.

  USE                    9.   Tenant shall continuously occupy and use the
                    Premises only for the Permitted Use and shall comply with
                    all Laws relating to the use, condition, and occupancy of
                    the Premises. The Premises shall not be used for any use
                    which is disreputable, creates extraordinary fire hazards or
                    results in an increased rate of insurance on the Building or
                    its contents or the storage of any hazardous materials or
                    substances, or is otherwise in violation of any of the terms
                    and provisions of this Lease. Landlord acknowledges and
                    agrees that the business of Tenant as indicated on the S-1
                    filed with the Securities and Exchange Commission is not
                    disreputable. If, because of Tenant's acts, the rate of
                    insurance on the Building or its contents increases, then
                    such acts shall be an Event of Default, Tenant shall pay to
                    Landlord the amount of such increase within five (5)
                    business days after Tenant's receipt of written demand for
                    such amount, and acceptance of such payment shall not
                    constitute a waiver of any of Landlord's other rights.
                    Tenant shall conduct its business and control its agents,
                    employees, and invitees in such a manner as not to create
                    any nuisance or interfere with other tenants or Landlord in
                    its management of the Building. The Premises shall not be
                    occupied by more than one (1) person per one hundred
                    seventy-five (175) net rentable square feet contained in the
                    Premises (with the understanding that Tenant may provide
                    working areas/stations at a ratio of one per 145 net
                    rentable square feet in the

                                       6
<PAGE>
 
                    Premises), and (ii) Tenant shall not conduct its business
                    within the Premises for more than fourteen (14) consecutive
                    hours during any business day (an insubstantial number of
                    employees working more than 14 consecutive hours during any
                    business day shall not constitute the conduct of Tenant's
                    business within the Premises for more than 14 consecutive
                    hours during such business day).


ASSIGNMENT AND           10.  (a)  Transfers Consent. Tenant shall not, without
SUBLETTING                         -----------------                           
                    the prior written consent of Landlord (which consent will
                    not be unreasonably withheld or delayed), (1) assign,
                    transfer, or encumber this Lease or any estate or interest
                    herein, whether directly or by operation of law, (2) permit
                    any other entity to become Tenant hereunder by merger,
                    consolidation, or other reorganization, (3) if Tenant is an
                    entity other than a corporation whose stock is publicly
                    traded, permit the transfer of an ownership interest in
                    Tenant so as to result in a change in the current control of
                    Tenant, (4) sublet any portion of the Premises, (5) grant
                    any license, concession, or other right of occupancy of any
                    portion of the Premises, or (6) permit the use of the
                    Premises by any parties other than Tenant (any of the events
                    listed in Sections 10.(a)(1) through 10.(a)(6) being a
                    "Transfer"). If Tenant requests Landlord's consent to a
                     --------                                              
                    Transfer, then Tenant shall provide Landlord with (A) a
                    written description of all terms and conditions of the
                    proposed Transfer (including, without limitation, the
                    proposed use of the Premises to be affected by such
                    Transfer), (B) copies of the proposed Transfer
                    documentation, (C) the following information about the
                    proposed transferee: name and address; reasonably
                    satisfactory information about its business and business
                    history; its proposed use of the Premises; banking,
                    financial, and other credit information; and general
                    references sufficient to enable Landlord to determine the
                    proposed transferee's creditworthiness and character, and
                    (D) such other information as Landlord may reasonably
                    request in writing within ten (10) days after its receipt of
                    the information described in clauses (A), (B) and (C) of
                    this paragraph. If Landlord fails to respond to any written
                    request by or on behalf of Tenant for Landlord's consent to
                    any Transfer within thirty (30) days of Landlord's receipt
                    of such written request and all of the information and
                    materials required by the immediately preceding sentence,
                    the request shall be deemed to have been denied by Landlord.
                    Tenant shall reimburse Landlord for its reasonable
                    attorneys' fees and other expenses reasonably incurred in
                    connection with considering any request for its consent to a
                    Transfer. If Landlord consents to a proposed Transfer, then
                    (i) Tenant agrees specifically to pay over to Landlord, as
                    Rent, all sums provided to be paid under the terms and
                    conditions of such Transfer which are in excess of the
                    amounts otherwise required to be paid by Tenant to Landlord
                    pursuant to this Lease, and (ii) the proposed transferee
                    shall deliver to Landlord a written agreement whereby it
                    expressly assumes the Tenant's obligations hereunder;
                    provided, however, that any sublessee of less than all of
                    the space in the Premises shall be liable only for
                    obligations under this Lease that are properly allocable to
                    the space subject to the applicable Transfer (excluding,
                    however, any obligation to pay Basic Rental and Tenant's
                    share of Excess, Tax Excess and DCURD Excess due hereunder
                    but including Tenant's share of Electrical Costs due
                    hereunder that are properly allocable to the space subject
                    to such Transfer). Landlord's consent to a Transfer shall
                    not release Tenant from performing its obligations under
                    this Lease, but rather Tenant and its transferee shall be
                    jointly and severally liable therefor. Landlord's consent to
                    any Transfer shall not waive Landlord's rights as to any
                    subsequent Transfers. If an Event of Default occurs while
                    the Premises or any part thereof are subject to a Transfer,
                    then Landlord, in addition to its other remedies, may
                    collect directly from such transferee all rents becoming due
                    to Tenant and apply such rents against Rent. Tenant
                    authorizes its transferees to make payments of rent directly
                    to Landlord upon receipt of notice from Landlord to do so.
                    If Tenant elects to assign this Lease or sublease all or any
                    portion of the Premises, Tenant may advertise the same
                    provided that Tenant has obtained the prior written consent
                    of Landlord to the form and content of any such advertising.
                    Tenant agrees that in the event Landlord withholds its
                    consent to any Transfer contrary to the provisions of this
                    Section 10, Tenant's sole remedy shall be to seek an
                    injunction in equity to compel performance by Landlord to
                    give its consent and Tenant expressly waives any right to
                    damages in the event of such withholding by Landlord of its
                    consent.



                              (b) Cancellation. Landlord may, within 30 days
                                  ------------                              
                    after submission of Tenant's written request for Landlord's
                    consent to a Transfer of the entire Premises or a portion of
                    the Premises for a term that ends within the last twelve
                    (12) months of the Term of this Lease, and all of the
                    information and

                                       7
<PAGE>
 
                    materials required by this Section 10, cancel this Lease
                    (or, as to a subletting or assignment, cancel as to the
                    portion of the Premises proposed to be sublet or assigned)
                    as of the date the proposed Transfer was to be effective. If
                    Landlord cancels this Lease as to any portion of the
                    Premises, then this Lease shall cease for such portion of
                    the Premises and Tenant shall pay to Landlord all Rent
                    accrued through the cancellation date relating to the
                    portion of the Premises covered by the proposed Transfer and
                    all brokerage commissions paid or payable by Landlord in
                    connection with this Lease that are allocable to such
                    portion of the Premises. No Rent shall accrue after such
                    cancellation date for the portion of the Premises cancelled.
                    Thereafter, Landlord may lease such portion of the Premises
                    to the prospective transferee (or to any other person)
                    without liability to Tenant.

                              (c) Additional Compensation. Prior to the
                                  -----------------------              
                    occurrence and other than during the continuance of an Event
                    of Default, Tenant shall pay to Landlord, immediately upon
                    receipt thereof, 50% of all compensation received by Tenant
                    for a Transfer that exceeds the Basic Rental and Tenant's
                    share of Electrical Costs, Excess, Tax Excess and DCURD
                    Excess allocable to the portion of the Premises covered
                    thereby (100% of such compensation is herein referred to as
                    the "Transfer Profits"); provided, however, that to the
                         ----------------                                  
                    extent any cash payment with respect to a Transfer (or any
                    other proceeds of such Transfer once the same have been
                    converted to cash) is paid to Landlord, Tenant shall receive
                    a dollar-for-dollar credit towards the Rent due hereunder
                    which is allocable to the portion of the Premises covered by
                    such Transfer and Landlord shall retain the amount, if any,
                    of such cash payment (or any other proceeds of such
                    Transfer) that exceeds the Basic Rental and Tenant's share
                    of Electrical Costs due hereunder which is allocable to the
                    portion of the Premises covered by such Transfer.
                    Notwithstanding the foregoing, after the occurrence and
                    during the continuance of an Event of Default, Tenant shall
                    pay to Landlord, immediately upon receipt thereof, 100% of
                    all Transfer Profits. Tenant hereby assigns to Landlord any
                    and all rights it might have or ever acquire in any cash or
                    other proceeds of any Transfer (whether or not such Transfer
                    was consented to by Landlord) subject, however, to Tenant's
                    conditional right to receive 50% of the Transfer Profits as
                    provided above. This covenant and assignment shall run with
                    the Land and shall bind Tenant and Tenant's heirs,
                    executors, administrators, personal representatives,
                    successors and assigns. Any assignee or purchaser of
                    Tenant's interest in this Lease or any sublessee of all or
                    any portion of the Premises (each such assignee, purchaser
                    or sublessee is herein sometimes referred to as a
                    "Transferee"), by occupying the Premises or any portion(s)
                     ----------                                               
                    thereof and/or assuming Tenant's obligations hereunder,
                    shall assume liability to Landlord for all amounts paid to
                    persons other than Landlord by such Transferee in connection
                    with any such assignment or sale of Tenant's interest in
                    this Lease or subletting of all or any portion of the
                    Premises.

                              (d) Transfer Restrictions. Tenant agrees not to
                                  ---------------------                      
                    (i) sublease any space in the Building to or from another
                    tenant of the Building or any Affiliate of such tenant, or
                    (ii) accept or make any assignment of a lease of any space
                    in the Building to or from another tenant of the Building or
                    any Affiliate of such tenant, without the written consent of
                    Landlord first had and obtained (which Landlord may grant or
                    deny in its sole discretion notwithstanding anything to the
                    contrary contained in this Lease). Landlord agrees not to
                    unreasonably withhold its consent to a request by Tenant to
                    sublease all or any portion of the Premises to or from
                    another tenant of the Building if Landlord does not then
                    have space Available For Rent (as hereinafter defined) in
                    the Building that is Comparable in Size (as hereinafter
                    defined) to either (1) the Premises or the applicable
                    portion thereof to be sublet, or (2) the space to be
                    subleased by Tenant from another tenant of the Building. For
                    the purposes of this Section 10, space in the Building shall
                    be considered "Available For Rent" if (A) the applicable
                                   ------------------                       
                    space is not then leased by a tenant and is not then subject
                    to any expansion options, rights of first offer or other
                    options or rights of other tenants or other third parties
                    (or is subject to any of the foregoing, but the party owning
                    the same has waived, been deemed to have waived, or failed
                    to timely exercise the same with respect to the leasing of
                    the applicable space by Landlord within the consent period
                    identified in Section 10.(a) above), or (B) if the
                    applicable space is then leased and the applicable tenant's
                    lease expires, or shall terminate effective as of a date
                    which is, 4 months or less from the date on which it is
                    being determined whether the applicable space is Available
                    For Rent and such space is not then subject to any expansion
                    options, rights of first offer or other options or rights of
                    other tenants or other third parties (or is subject to any
                    of the foregoing, but the party owning the same has waived,

                                       8
<PAGE>
 
                    been deemed to have waived, or failed to timely exercise the
                    same with respect to the leasing of the applicable space by
                    Landlord within the consent period identified in Section
                    10.(a) above), and space in the Building shall be considered
                    "Comparable in Size" if it is between 75% and 125% of the
                     ------------------
                    amount of net rentable square feet of space being compared
                    to such space (by way of example only, if Tenant is
                    proposing to sublease 10,000 net rentable square feet of
                    space of the Premises, then any space containing at least
                    7,500 net rentable square feet of space and not more than
                    12,500 net rentable square feet of space would be considered
                    Comparable in Size). For the purposes of this Lease, the
                    term "Affiliate" shall mean a person or entity directly or
                          ---------
                    indirectly, through one or more intermediaries, controlling,
                    controlled by or under common control with the party in
                    question. The term "control", as used in this Section 10,
                                        -------
                    means, with respect to an entity that is a corporation, the
                    right to the exercise, directly or indirectly, of more than
                    50% of the voting rights attributable to the shares of the
                    controlled corporation and, with respect to an entity that
                    is not a corporation, the possession, directly or
                    indirectly, of the power to direct or cause the direction of
                    the management or policies of the controlled entity. In
                    determining whether a person or entity is an Affiliate of an
                    individual, the aggregate voting rights or interests in
                    other entities which are held by members of such
                    individual's immediate family members or by trusts for the
                    benefit of such individual's immediate family members shall
                    be attributed to such individual.

                              (e) Bankruptcy Provisions. Tenant (or any
                                  ---------------------                
                    Transferee), Tenant (or any Transferee) as debtor-in-
                    possession, and any trustee or receiver of Tenant's (or any
                    Transferee's) assets (each, whether as to Tenant or any
                    Transferee, a "Tenant's Representative") shall have no
                                   -------- --------------                
                    greater rights to assume or assign this Lease or any
                    interest in this Lease, or to sublease all or any portion of
                    the Premises, than the rights provided to Tenant in this
                    Section 10 except to the extent Landlord shall be required
                    to permit such assumption, assignment or subletting by the
                    provisions of any Applicable Bankruptcy Law (as hereinafter
                    defined). Without limiting the generality of the foregoing,
                    if, pursuant to Applicable Bankruptcy Law, a Tenant's
                    Representative is permitted to assign this Lease in
                    disregard of the restrictions contained in this Section 10
                    (or if this Lease shall be assumed by a trustee or receiver
                    of Tenant or any Transferee), then the right of any Tenant's
                    Representative to assume or assign this Lease or to sublease
                    any of the Premises shall be subject to the following
                    conditions: (1) such Applicable Bankruptcy Law shall provide
                    to such Tenant's Representative a right of assumption of
                    this Lease which Tenant's Representative shall have timely
                    exercised and such Tenant's Representative or proposed
                    assignee shall have fully cured any default of Tenant (or
                    any Transferee) under this Lease; (2) such Tenant's
                    Representative or proposed assignee, as applicable, shall
                    have deposited with Landlord, as security for the timely
                    payment of Rent, cash security in an amount equal to the sum
                    of (i) the amount of the Security Deposit, if any, required
                    to be deposited with Landlord by the initial Tenant named in
                    this Lease, and (ii) one year's Basic Rental and Tenant's
                    share of Electrical Costs, Excess, Tax Excess and DCURD
                    Excess then reserved hereunder for the calendar year
                    preceding the year in which such assignment is intended to
                    become effective, which deposit shall be held by Landlord,
                    without interest, for the balance of the Term of this Lease
                    as security for the full and faithful performance of all of
                    the obligations under this Lease on the part of Tenant yet
                    to be performed; (3) such Tenant's Representative or
                    proposed assignee, as applicable, shall have provided
                    adequate assurance of the future performance of the
                    obligations of Tenant (or any Transferee) under this Lease
                    including, without limitation, the source of payment of Rent
                    and performance of all other obligations under this Lease
                    (which adequate assurance shall include, without limitation,
                    demonstration to the satisfaction of Landlord that [a] in
                    the case of an assumption of this Lease, Tenant's
                    Representative has and will continue to have sufficient
                    unencumbered assets after the payment of all secured
                    obligations and administrative expenses to assure Landlord
                    that Tenant's Representative will have sufficient funds to
                    fulfill the obligations of Tenant under this Lease, or [b]
                    in the case of an assignment of this Lease, such assignee
                    shall have a net worth, exclusive of good will and computed
                    in accordance with generally accepted accounting principles,
                    equal to the greater of (y) at least ten (10) times the sum
                    of all monthly installments of Basic Rental due under this
                    Lease during the initial Term hereof, or (z) the net worth
                    of the initial Tenant named in this Lease on the Lease Date,
                    which net worth shall be evidenced by current financial
                    statements of the proposed assignee, audited by an
                    independent certified public accountant reasonably
                    acceptable to Landlord); (4) the use of the Premises shall
                    be in accordance with the requirements of this Lease

                                       9
<PAGE>
 
                    and, further, shall in no way diminish the reputation of the
                    Building as a first-class office building or impose any
                    additional burden upon the Building or increase the services
                    which Landlord would be required by this Lease to provide;
                    (5) the assumption or any contemplated assignment of this
                    Lease or subleasing of any portion of the Premises, as
                    applicable, shall not breach any provision in any other
                    lease Of space in the Building or any mortgage, financing
                    agreement or other agreement by which Landlord is bound; and
                    (6) Landlord shall have, or would have had absent the
                    Applicable Bankruptcy Law, no right under this Section 10 to
                    refuse consent to the proposed assignment or subletting by
                    reason of the identity or nature of the proposed assignee or
                    sublessee or the proposed use of the Premises to be affected
                    by such assignment or subletting. If all defaults are not
                    cured and such adequate assurance is not provided within
                    sixty (60) days after there has been an order for relief
                    under Applicable Bankruptcy Law, then (A) this Lease shall
                    be deemed rejected, (B) Tenant or any other person in
                    possession shall vacate the Premises, and (C) Landlord shall
                    be entitled to retain any Rent due hereunder, together with
                    any security deposit previously received from Tenant, and
                    shall have no further liability to Tenant or any person
                    claiming by, through or under Tenant or any trustee. If
                    Tenant assigns this Lease to any party and such party or its
                    successors or representatives causes a termination or
                    rejection of this Lease pursuant to Applicable Bankruptcy
                    Law, then, notwithstanding any such termination or
                    rejection, Tenant shall remain fully liable for the
                    performance of all covenants, agreements, terms, provisions
                    and conditions contained in this Lease as though the
                    termination or rejection never occurred and shall, without
                    in any way limiting the foregoing, in writing reinstate and
                    ratify the terms of this Lease as the same existed
                    immediately prior to the termination or rejection. As used
                    herein, the term "Applicable Bankruptcy Law" shall mean any
                                      -------------------------
                    law, whether federal or state, relating to bankruptcy,
                    insolvency, reorganization, liquidation, winding-up or
                    composition or adjustment of, or relief from, debts.
                    Notwithstanding anything contained in this Lease to the
                    contrary, (i) all amounts payable by Tenant to or for the
                    benefit of Landlord under this Lease, whether or not
                    expressly denominated as Rent, shall constitute rent for the
                    purposes of Section 502(b)(7) of the United States
                    Bankruptcy Code, and (ii) this is a contract under which
                    applicable Law excuses Landlord from accepting performance
                    from (or rendering performance to) any person or entity
                    other than Tenant within the meaning of Sections 365(c) and
                    365(e)(2) of the United States Bankruptcy Code.


                              (f) Withholding of Consent. For the purposes of
                                  ----------------------                     
                    this Section 10, Landlord shall be deemed to have reasonably
                    withheld its consent to a Transfer if the refusal is based
                    on any one or more of the following: (1) Tenant's failure to
                    satisfy its obligations in the second and fourth sentences
                    of the Section 10.(a) above; (2) Landlord, in its sole
                    discretion reasonably exercised, has determined that one or
                    more of the reputation, business, proposed use of the
                    Premises, and/or the financial responsibility of and by the
                    proposed transferee is not satisfactory to Landlord (for the
                    purposes of this Lease, Landlord shall be conclusively
                    deemed to have reasonably exercised its discretion to
                    withhold its consent to an assignment or subletting to a
                    person or entity that either [a] is not of the character,
                    quality or financial strength of a tenant to whom Landlord
                    would generally lease space in the Building, or [b] is
                    similar in reputation, business, proposed use of space in
                    the Building and/or financial responsibility to either [i] a
                    prospective tenant of space in the Building to whom Landlord
                    elected not to lease such space, or [ii] a proposed assignee
                    or sublessee whose proposed assignment or subletting was not
                    consented to by Landlord); (3) at the time thereof an Event
                    of Default has occurred and is continuing or an event has
                    occurred and is continuing which with the giving of notice
                    or the passage of time, or both, would constitute an Event
                    of Default; (4) the proposed assignee or sublessee is an
                    existing tenant of the Building or Landlord reasonably
                    believes that the proposed assignee or sublessee is an
                    Affiliate (as defined in Section 10.(e) below) of an
                    existing tenant of the Building and Landlord then has space
                    Available For Rent in the Building that is Comparable in
                    Size to the Premises or the applicable portion thereof to be
                    sublet; (5) the portion(s) of the Premises subject to the
                    proposed Transfer will, in Landlord's sole discretion
                    reasonably exercised, cause the Premises to be excessively
                    and/or unacceptably "chopped-up"; (6) a lessor under any
                    Primary Lease (as defined in Section 12.(a) below) or the
                    holder of any Mortgage (as defined in Section 12.(a) below)
                    has objected to the proposed Transfer and Landlord has not
                    requested that such lessor or holder make such an objection;
                    (7) without limiting clause (4) of this paragraph, the
                    proposed Transfer conflicts in any manner with this Lease
                    (including, but not limited to, the use permitted by Section
                    9 above or any requirements or restrictions related
                    thereto); (8) the fact

                                       10
<PAGE>
 
                    that the proposed assignee or sublessee is a governmental or
                    telemarketing entity or any other high-density user; (9) the
                    proposed assignee's or sublessee's primary business is
                    prohibited by a non-compete or similar provision of another
                    lease of space at the Building; (10) the proposed assignee
                    or sublessee is a competitor or Affiliate of Landlord; (11)
                    the proposed assignee or sublessee is then, or has within
                    twelve months immediately preceding Tenant's written request
                    for Landlord's consent to such Transfer been, a person or
                    entity with whom Landlord is dealing or has dealt regarding
                    the possibility of leasing space in the Building and
                    Landlord then has space Available For Rent in the Building
                    that is Comparable in Size to the Premises or the applicable
                    portion thereof to be sublet; or (12) the fact that the
                    instrument effecting the proposed Transfer is not in form
                    and content reasonably satisfactory to Landlord.

                              (g) Transfer Without Landlord Consent.
                                  --------------------------------- 
                    Notwithstanding anything to the contrary set forth above,
                    Tenant may assign this Lease in its entirety or sublease all
                    or any portion of the Premises without the prior written
                    consent of Landlord to (1) any partnership, corporation or
                    other business entity into or with which Tenant shall be
                    merged, converted or consolidated in accordance with
                    applicable statutory provisions governing merger, conversion
                    or consolidation of the applicable business entity, or (2) a
                    partnership, corporation or other business entity which is a
                    direct successor to Tenant owning all or substantially all
                    of Tenant's business and assets provided that, in connection
                    with any assignment or subletting described in clauses (1)
                    and (2) of this Section 10.(g), (A) Tenant shall have
                    notified Landlord in writing prior to such assignment or
                    subletting, (B) at the time thereof, no Event of Default has
                    occurred and is continuing and no event has occurred and is
                    continuing which with the giving of notice or the passage of
                    time, or both, would constitute an Event of Default, (C) the
                    proposed transferee shall deliver to Landlord a written
                    agreement whereby it expressly assumes all of the Tenant's
                    obligations under this Lease; provided, however, that any
                    sublessee of less than all of the space in the Premises
                    shall be liable only for obligations under this Lease that
                    are properly allocable to the space subject to the
                    applicable Transfer (excluding, however, any obligation to
                    pay Rent due hereunder), (D) the proposed assignee or
                    sublessee shall not be an existing tenant of the Building or
                    an Affiliate of such tenant, (E) Tenant shall have agreed
                    specifically to pay over to Landlord, as additional rent,
                    all sums provided to be paid under the terms and conditions
                    of such assignment or sublease which are in excess of the
                    amounts otherwise required to be paid by Tenant to Landlord
                    pursuant to this Lease with respect to the portion of the
                    Premises covered by such Transfer, (F) Tenant shall have
                    reimbursed Landlord for all costs and expenses reasonably
                    incurred by Landlord (including, without limitation,
                    reasonable attorneys' fees) in connection with such
                    assignment and/or subletting, and (G) in the case of a
                    Transfer described in clauses (1) and (2) of this paragraph,
                    Tenant shall have provided Landlord with evidence reasonably
                    acceptable to Landlord that the proposed assignee/sublessee
                    has a demonstrable net worth not less than the net worth of
                    Tenant as of the date of such assignment or subletting. Any
                    assignment or subletting permitted without Landlord's prior
                    written consent as provided above (a "Permitted Transfer
                                                          ------------------
                    Without Landlord Consent") shall not release Tenant from any
                    ------------------------                                    
                    of its obligations (including, without limitation, its
                    obligation to pay Rent) under this Lease. For the purposes
                    of this Section 10.(g), the term "Tenant" shall also mean a
                    permitted assignee or sublessee of the initial Tenant named
                    in this Lease.

                              (h) Miscellaneous. Landlord's consent to a
                                  -------------                         
                    Transfer shall not release Tenant from performing its
                    obligations under this Lease, but rather Tenant and its
                    Transferee shall be jointly and severally liable therefor;
                    provided, however, that any sublessee of less than all of
                    the space in the Premises shall be liable only for
                    obligations under this Lease that are properly allocable to
                    the space subject to the applicable Transfer (excluding,
                    however, any obligation to pay Basic Rental and Tenant's
                    share of Excess, Tax Excess and DCURD Excess due hereunder
                    but including Tenant's share of Electrical Costs due
                    hereunder that are properly allocable to the space subject
                    to such Transfer). Landlord's consent to any Transfer shall
                    not waive Landlord's rights as to any subsequent Transfers.
                    If an Event of Default occurs while the Premises or any part
                    thereof are subject to a Transfer, then Landlord, in
                    addition to its other rights and/or remedies, may collect
                    directly from such Transferee all rents becoming due to
                    Tenant and apply such rents against all Rent due hereunder
                    (including, without limitation, all Basic Rental and
                    Tenant's share of Electrical Costs, Excess, Tax Excess and
                    DCURD Excess due hereunder). Tenant authorizes its
                    Transferees to make payments of

                                       11
<PAGE>
 
                    rent directly to Landlord upon receipt of notice from
                    Landlord to do so. Without limiting Landlord's consent
                    rights and as a condition to obtaining Landlord's consent to
                    any proposed Transfer, (i) each sublessee must confirm in
                    writing that its sublease is subject and subordinate to this
                    Lease, and (ii) each Transferee shall agree to cause the
                    Premises to comply at all times with all applicable Laws
                    (including, without limitation, all Disability Laws
                    applicable to such Transferee's particular use of, or
                    activities or business operations conducted within, the
                    applicable portion(s) of the Premises or any specific
                    handicaps that such Transferee's employees, officers or
                    directors might have). Except as expressly provided in this
                    Lease to the contrary, no assignee or sublessee of the
                    Premises or any portion thereof shall have the right to
                    assign or sublet the Premises or any portion thereof. In the
                    event that, following an assignment or subletting permitted
                    by this Section 10, this Lease or the rights and obligations
                    of Tenant hereunder are terminated for any reason, Landlord
                    may, at its sole option, deem this Lease to be thereafter a
                    direct lease to the assignee or sublessee of Tenant covering
                    such assignee's or sublessee's premises.

INSURANCE;               11.  (a) Insurance. Tenant shall at its expense procure
WAIVERS;                          ---------                                     
SUBROGATION;        and maintain throughout the Term the following insurance
INDEMNITY           policies' (1) commercial general liability insurance in
                    amounts of not less than a combined single limit of
                    $5,000,000 (the "Initial Liability Insurance Amount"),
                                     ----------------------------------   
                    insuring Tenant, Landlord and all other Landlord Parties (as
                    hereinafter defined) against all liability for injury to or
                    death of a person or persons or damage to property arising
                    from the use and occupancy of the Premises (this insurance
                    coverage shall include broad form property damage liability
                    and shall contain an exception to any pollution exclusion
                    which insures damage or injury arising out of heat, smoke or
                    fumes from a hostile fire), (2) contractual liability
                    insurance coverage sufficient to cover Tenant's indemnity
                    obligations hereunder, (3) Special Form (formerly referred
                    to as "All Risk") insurance (no exclusions shall be
                    permitted with respect to vandalism, malicious mischief,
                    theft and sprinkler leakage) covering the full value of
                    Tenant's property and improvements, and other property
                    (including property of others), in the Premises (in the
                    event there is a dispute as to the amount that comprises
                    full value of such property and improvements, the decision
                    of Landlord shall be conclusive, and evidence of this
                    insurance shall be provided on ACORD Form 27), (4) workers'
                    compensation insurance in the statutory limits and
                    employer's liability insurance (no "alternative" form of
                    coverage shall be acceptable) in an amount of not less than
                    $1,000,000.00 bodily injury by accident, each accident,
                    $1,000,000.00 bodily injury by disease, policy limit, and
                    $1,000,000.00 bodily injury by disease, each employee, each
                    (and any commercial umbrella applicable thereto) containing
                    a waiver of subrogation endorsement using endorsement form
                    WC 429394 (i.e., a waiver of subrogation endorsement) or
                    such other endorsement form as may be reasonably required by
                    Landlord, and such endorsements shall be in favor of all
                    Landlord Parties, (5) business income and extra expense
                    insurance (formerly known as "business interruption
                    insurance") in such amounts as will reimburse Tenant for
                    direct or indirect loss of earnings attributable to all
                    perils commonly insured against by prudent tenants or
                    attributable to prevention of access to the Premises or to
                    the Building as a result of such perils, but in no event
                    shall such coverage be for less than twelve (12) months of
                    income and expenses, (6) business automobile liability
                    insurance covering owned, non-owned and hired vehicles in an
                    amount of not less than $1,000,000 combined single limit for
                    bodily injury and property damage should Landlord deem such
                    insurance to be necessary, and (7) any other and further
                    insurance as Tenant, Landlord or any Landlord's Mortgagee
                    may require from time to time in form, amounts and for
                    insurance risks against which a prudent tenant would protect
                    itself. Not more frequently than every five (5) years, if,
                    in the opinion of Landlord's risk management group, the
                    amount of liability insurance at that time maintained by
                    Tenant as required by this Lease (i.e., commercial general
                    liability, employer's liability and/or business automobile
                    liability insurance) is not adequate, Landlord shall notify
                    Tenant of Landlord's risk management group's recommended
                    increase of the same and Tenant shall increase the
                    applicable liability insurance coverage to such recommended
                    amount. As used herein, the term "Landlord Parties" shall
                                                      ----------------       
                    mean (i) Landlord, (ii) any Landlord's Mortgagee, (iii) the
                    Building manager and any other parties which Landlord shall
                    deem necessary, (iv) Landlord's, Landlord's Mortgagee's and
                    the Building manager's respective shareholders, members,
                    partners and Affiliates, and (v) any directors, officers,
                    employees, agents or contractors of such persons or
                    entities. Tenant's insurance shall provide primary coverage
                    to Landlord when any policy issued to Landlord provides
                    duplicate or similar coverage, and in such

                                       12
<PAGE>
 
                    circumstance Landlord's policy will be excess over Tenant's
                    policy. All property insurance policies written on behalf of
                    Tenant shall name all Landlord Parties as a loss payee as
                    their respective interests may appear, and shall contain (or
                    be endorsed to provide) a waiver of any subrogation rights
                    which Tenant's insurers may have against Landlord Parties
                    and against those for whom Landlord Parties are, at law,
                    responsible whether any such damage is caused by the act,
                    omission or fault of any Landlord Parties or by those for
                    whom any Landlord Parties are, at law, responsible. Tenant's
                    liability insurance shall (1) be written on an occurrence
                    basis on either Insurance Services Office ("ISO") form CG
                                                                ---
                    0001 1092 or CG 0001 0695, (2) contain standard commercial
                    general liability "other insurance" wording, unmodified in
                    any way that would make it excess over or contributory with
                    an additional insured's own commercial general liability
                    insurance coverage, and (3) be primary and noncontributory
                    to any other insurance carried by Landlord or any other
                    Landlord Parties. All commercial general liability insurance
                    maintained by Tenant as required by this Lease (and any
                    commercial umbrella applicable thereto) shall be endorsed
                    using ISO form CG 2404 1093 (i.e., a waiver of subrogation
                    endorsement) and ISO form CG 2026 1185, and both such
                    endorsements shall be unmodified and shall be in favor of
                    all Landlord Parties. No deductible or self-insured
                    retention in excess of $10,000.00 shall apply to any
                    liability insurance of Tenant without the prior written
                    consent of Landlord. All policies shall be taken out with
                    insurers acceptable to Landlord, licensed in the State of
                    Texas and with a rating of (i) "A-" "XII" or better as set
                    forth in the most current issue of Best's Key Rating Guide,
                    and/or (ii) "A-" or better as set forth in the most current
                    issue of Standard & Poor Insurance Solvency Review. Tenant
                    agrees that certificates of insurance (or, if required by
                    Landlord or any Landlord's Mortgagee, certified copies of
                    each such insurance policy), in form and content acceptable
                    to Landlord, will be delivered to Landlord as soon as
                    practicable after the placing of the required insurance, but
                    in no event later than five (5) days prior to which Tenant
                    takes possession of all or any part of the Premises. All
                    policies shall indicate that at least thirty (30) days prior
                    written notice shall be delivered to Landlord and any
                    Landlord's Mortgagee by the insurer prior to termination,
                    cancellation or change of such insurance. Copies of
                    endorsements must be attached to all certificates delivered
                    by Tenant to Landlord as required by this Lease and Landlord
                    Parties must be identified, as applicable, as the
                    "additional insured" or "beneficiary" on such certificates.
                    Landlord must be notified in writing immediately by Tenant
                    of claims against Tenant that might cause a reduction below
                    seventy-five percent (75%) of any aggregate limit of any
                    insurance policy maintained by Tenant as required by this
                    Lease. Any deductible selected by Tenant shall be the sole
                    responsibility of Tenant.

                              (b) Waiver of Negligence Claims No Subrogation.
                                  ------------------------------------------ 
                    Landlord shall not be liable to Tenant or those claiming by,
                    through, or under Tenant for any injury to or death of any
                    person or persons or the damage to or theft, destruction,
                    loss, or loss of use of any property or inconvenience (a
                    "Loss") caused by casualty, theft, fire, third parties, or
                     ----                                                     
                    any other matter (including Losses arising through repair or
                    alteration of any part of the Building, or failure to make
                    repairs, or from any other cause), regardless of whether the
                    negligence of any party caused such Loss in whole or in
                    part. Landlord and Tenant each waives any claim it might
                    have against the other for any damage to or theft,
                    destruction, loss, or loss of use of any property, to the
                    extent the same is insured against under any insurance
                    policy that covers the Building, the Premises, Landlord's or
                    Tenant's fixtures, personal property, leasehold
                    improvements, or business, or, in the case of Tenant's
                    waiver, is required to be insured against under the terms
                    hereof, regardless of whether the negligence or fault of the
                    other party caused such loss; however, Landlord's waiver
                    shall not include any deductible amounts on insurance
                    policies carried by Landlord or apply to any coinsurance
                    penalty which Landlord might sustain. Each party shall cause
                    its insurance carrier to endorse all applicable policies
                    waiving the carrier's rights of recovery under subrogation
                    or otherwise against the other party.

                              (c) Indemnity. Subject to Section 11.(b), Tenant
                                  ---------                                   
                    shall defend, indemnify, and hold harmless Landlord and its
                    agents from and against all claims, demands, liabilities,
                    causes of action, suits, judgments, and expenses (including
                    attorneys' fees) for any Loss arising from any occurrence on
                    the Premises or from Tenant's failure to perform its
                    obligations under this Lease (other than a Loss arising from
                    the sole or gross negligence of Landlord or its agents),
                    even though caused or alleged to be caused by the joint,
                    comparative, or concurrent negligence or fault of Landlord
                    or its agents, and even though any such claim, cause of

                                       13
<PAGE>
 
                    action, or suit is based upon or alleged to be based upon
                    the strict liability of Landlord or its agents. THIS
                    INDEMNITY PROVISION IS INTENDED TO INDEMNIFY LANDLORD AND
                    ITS AGENTS AGAINST THE CONSEQUENCES OF THEIR OWN NEGLIGENCE
                    OR FAULT AS PROVIDED ABOVE WHEN LANDLORD OR ITS AGENTS ARE
                    JOINTLY, COMPARATIVELY, OR CONCURRENTLY NEGLIGENT WITH
                    TENANT. This indemnity provision shall survive termination
                    or expiration of this Lease.

                              (d) Miscellaneous. If Tenant or any contractor of
                                  -------------                                
                    Tenant performs any work on any portion or portions of the
                    Premises, prior to the commencement of any such work, Tenant
                    shall deliver to Landlord certificates issued by insurance
                    companies licensed to do business in the State of Texas, in
                    form and content acceptable to Landlord, evidencing that
                    commercial general liability, workers' compensation,
                    employer's liability, automobile liability and other
                    insurance as required by Landlord and any Landlord's
                    Mortgagee, in amounts and with companies reasonably
                    satisfactory to Landlord, are in force and effect and
                    maintained by all contractors and subcontractors engaged by
                    Tenant or any contractor of Tenant to perform such work, and
                    name all Landlord Parties as additional insureds. Tenant
                    agrees that in the event of damage or destruction to the
                    leasehold improvements in the Premises covered by insurance
                    required to be taken out by Tenant pursuant to this Section,
                    Tenant will use the proceeds of such insurance for the
                    purpose of repairing or restoring such leasehold
                    improvements. In the event of (1) damage or destruction to
                    the Building entitling Landlord or Tenant to terminate this
                    Lease pursuant to Section 15 below, and (2) a termination of
                    this Lease pursuant to such Section, then (i) if the
                    Premises have also been damaged, Tenant will pay to Landlord
                    all of Tenant's insurance proceeds relating to the leasehold
                    improvements in the Premises, and (ii) if the Premises have
                    not been damaged, Tenant will deliver to Landlord, in
                    accordance with the provisions of this Lease, possession of
                    the Premises together with all leasehold improvements
                    located therein except as otherwise expressly provided in
                    this Lease.

                              (e) Landlord Indemnity. Landlord shall be liable
                                  ------------------                          
                    for, and shall indemnify, defend, protect and hold Tenant
                    and Tenant's partners and their respective officers,
                    directors, employees, agents, successors and assigns
                    (collectively, the "Tenant Indemnitees") harmless from and
                                        ------------------                    
                    against, any and all claims, demands, actions, damages
                    (excluding, however, consequential or special damages),
                    losses, liabilities, judgments, costs and expenses
                    (including, without limitation, attorneys' fees and court
                    costs) (each a "Claim" and collectively the "Claims"), to
                                    -----                        ------      
                    the extent (i) arising or resulting from the sole or gross
                    negligence or willful misconduct of Landlord or any Landlord
                    Indemnitees, and (ii) not covered or required to be covered
                    by Tenant's insurance described in Section 11.(a) above;
                    provided, however, such indemnification by Landlord shall
                    not include Claims waived by Tenant in Section 11.(b) above
                    and any Claim to the extent caused by or resulting from the
                    negligence, gross negligence or willful misconduct of Tenant
                    or its assignees, sublessees, officers, directors,
                    employees, agents, servants, contractors, customers or
                    invitees.

SUBORDINATION            12.  (a)  Subordination. This Lease shall be
ATTORNMENT;                        -------------                     
NOTICE TO           Subordinate to any deed of trust, mortgage, or other
LANDLORD'S          security instrument (a "Mortgage"), or any ground lease,
MORTGAGEE                                   --------                        
                    master lease, or primary lease (a "Primary Lease"), that now
                                                       ------- -----            
                    or hereafter covers all or any part of the Premises (the
                    mortgagee under any Mortgage or the lessor under any Primary
                    Lease is referred to herein as "Landlord's Mortgagee");
                                                    ---------- ---------   
                    provided, however, that the foregoing subordination in
                    respect of any Primary Lease or Mortgage placed on the
                    Building after the Lease Date shall not become effective
                    until and unless the lessor under such Primary Lease or the
                    holder of such Mortgage delivers to Tenant a non-disturbance
                    agreement (a "Non-Disturbance Agreement") which provides
                                  -------------------------                 
                    that if Tenant is not then in default under, or in breach of
                    any provision of, this Lease, Landlord's Mortgagee will not
                    disturb Tenant's right of occupancy of the Premises (i.e.,
                    Tenant's quiet enjoyment rights as more particularly
                    provided in Section 25(i) below) in the event of a
                    foreclosure of any such Mortgage or a termination of any
                    such Primary Lease (a Non-Disturbance Agreement may also
                    include Tenant's agreement to attorn as set forth below and
                    will contain such other provisions as Landlord's Mortgagee
                    shall require in connection therewith). Although the
                    subordination in the immediately preceding sentence shall be
                    self-operating, Tenant, or its successors in interest,
                    shall, upon Landlord's request, execute and deliver upon

                                       14
<PAGE>
 
                    demand any and all Non-Disturbance Agreements delivered to
                    Tenant subordinating this Lease to such Primary Lease or
                    Mortgage. Tenant also agrees that any Landlord's Mortgagee
                    may elect (which election shall be revocable) to have this
                    Lease superior to its Primary Lease or the lien of its
                    Mortgage and, in the event of such election and upon
                    notification by such Landlord's Mortgagee to Tenant to that
                    effect, this Lease shall be deemed superior to the said
                    Primary Lease or Mortgage, whether this Lease is dated prior
                    to or subsequent to the date of such Primary Lease or
                    Mortgage. Although the subordination in the immediately
                    preceding sentence shall be self-operating, Tenant, or its
                    successors in interest, shall, upon Landlord's request,
                    execute and deliver upon the demand of Landlord any and all
                    instruments desired by Landlord, subordinating, in the
                    manner reasonably requested by Landlord, any such Primary
                    Lease or Mortgage to this Lease. If Tenant fails to execute
                    and deliver to Landlord any Non-Disturbance Agreement or any
                    such subordination instrument delivered to Tenant for
                    Tenant's execution within ten (10) business days after
                    Tenant's receipt of the same, then (1) such failure shall
                    constitute an Event of Default until such time as the
                    applicable instrument has been executed by Tenant and
                    delivered to Landlord, (2) Tenant shall be deemed to have
                    agreed to all of the terms and provisions of such Non-
                    Disturbance Agreement or such subordination instrument, and
                    (3) Tenant shall thereafter be estopped from disclaiming any
                    of the obligations, benefits and burdens set forth therein
                    including, without limitation, (i) the subordination of this
                    Lease to any Mortgage, Primary Lease or similar instruments,
                    (ii) any non-disturbance rights provided to Tenant therein,
                    and (iii) any attornment agreements of Tenant set forth
                    therein. Landlord is hereby irrevocably appointed and
                    authorized as agent and attorney-in-fact of Tenant, coupled
                    with an interest, to execute all such Non-Disturbance
                    Agreements and subordination instruments in the event Tenant
                    fails to execute said instruments within ten (10) business
                    days after Tenant's receipt of the same.

                              (b) Attornment. Tenant shall attorn to any party
                                  ----------                                  
                    succeeding to Landlord's interest in the Premises, whether
                    by purchase, foreclosure, deed in lieu of foreclosure, power
                    of sale, termination of lease, or otherwise, upon such
                    party's request, and shall execute such agreements
                    confirming such attornment as such party may reasonably
                    request.

                              (c) Notice to Landlord's Mortgagee. Tenant shall
                                  ------------------------------              
                    not seek to enforce any remedy it may have for any default
                    on the part of the Landlord without first giving written
                    notice by certified mail, return receipt requested,
                    specifying the default in reasonable detail, to any
                    Landlord's Mortgagee whose address has been given to Tenant,
                    and affording such Landlord's Mortgagee a reasonable
                    opportunity to perform Landlord's obligations hereunder.

                              (d) Non-Disturbance Agreement from Current
                                  --------------------------------------
                    Landlord's Mortgagee. Landlord shall use its reasonably best
                    --------------------                                        
                    efforts to obtain a Non-Disturbance Agreement from the
                    Landlord's Mortgagee whose Mortgage currently covers the
                    Building. Upon the delivery to Tenant of multiple originals
                    of a Non-Disturbance Agreement executed by such Landlord's
                    Mortgagee and the other party or parties thereto (other than
                    Tenant), Tenant shall, within ten (10) days after Tenant's
                    receipt of the same, execute each of the same and return all
                    but one of such originals to Landlord at Landlord's address
                    for notices set forth in this Lease.

RULES AND                13.  Tenant shall comply with the rules and regulations
REGULATIONS         of the Building which are attached hereto as Exhibit B.
                                                                 --------- 
                    Landlord may, from time to time, change such rules and
                    regulations for the safety, care, or cleanliness of the
                    Building and related facilities, provided that such changes
                    are applicable to all tenants of the Building and will not
                    unreasonably interfere with Tenant's use of the Premises.
                    Tenant shall be responsible for the compliance with such
                    rules and regulations by its employees, agents, and
                    invitees.

CONDEMNATION             14.  (a)  Taking - Landlord's and Tenant's Rights. If
                                   -------- ------------------------------    
                    any part of the Building is taken by right of eminent domain
                    or conveyed in lieu thereof (a "Taking"), and such Taking
                                                    ------                   
                    prevents Tenant from conducting its business in the Premises
                    in a manner reasonably comparable to that conducted
                    immediately before such Taking, then Landlord may, at its
                    expense, relocate Tenant to office space reasonably
                    comparable to the Premises, provided that Landlord notifies
                    Tenant of its intention to do so within 30 days after the
                    Taking. Such relocation may be for a portion of the
                    remaining Term or the entire Term. Landlord shall complete
                    any such relocation within 180 days after Landlord has
                    notified Tenant

                                       15
<PAGE>
 
                    of its intention to relocate Tenant. If Landlord does not
                    elect to relocate Tenant following such Taking, then Tenant
                    may terminate this Lease as of the date of such Taking by
                    giving written notice to Landlord within 60 days after the
                    Taking, and Rent shall be apportioned as of the date of such
                    Taking. If Landlord does not relocate Tenant and Tenant does
                    not terminate this Lease, then Rent shall be abated on a
                    reasonable basis as to that portion of the Premises rendered
                    untenantable by the Taking.

                              (b) Taking - Landlord's Rights. If any material
                                  --------------------------                 
                    portion, but less than all, of the Building becomes subject
                    to a Taking, or if Landlord is required to pay any of the
                    proceeds received for a Taking to Landlord's Mortgagee, then
                    this Lease, at the option of Landlord, exercised by written
                    notice to Tenant within 30 days after such Taking, shall
                    terminate and Rent shall be apportioned as of the date of
                    such Taking. If Landlord does not so terminate this Lease
                    and does not elect to relocate Tenant, then this Lease will
                    continue, but if any portion of the Premises has been taken,
                    Basic Rental shall abate as provided in the last sentence of
                    Section 14.(a).

                              (c) Award. If any Taking occurs, then Landlord
                                  -----                                     
                    shall receive the entire award or other compensation for the
                    Land, the Building, and other improvements taken, and Tenant
                    may separately pursue a claim against the condemnor for the
                    value of Tenant's personal property which Tenant is entitled
                    to remove under this Lease, moving costs, loss of business,
                    and other claims it may have.

FIRE OR OTHER            15.  (a)  Repair Estimate. If the Premises or the
CASUALTY                           ---------------                        
                    Building are damaged by fire or other casualty (a
                    "Casualty"), Landlord shall, within 60 days after such
                     --------                                             
                    Casualty, deliver to Tenant a good faith estimate (the
                    "Damage Notice") of the time needed to repair the damage
                     -------------                                          
                    caused by such Casualty.

                              (b) Landlord's and Tenant's Rights. In the event
                                  ------------------------------              
                    the Premises or the Building are damaged by a Casualty and
                    the insurance proceeds have been made available therefor by
                    the holder or holders of any Mortgages or the lessor under
                    any Primary Lease, the damage shall be repaired by and at
                    the expense of Landlord to the extent of such insurance
                    proceeds available therefor, provided such repairs can, in
                    Landlord's sole opinion, be made within one hundred twenty
                    (120) days after the occurrence of such damage without the
                    payment of overtime or other premiums. Until such repairs
                    are completed, Rent shall be abated effective as of the date
                    of such fire or other casualty in proportion to the part of
                    the Premises which is unusable by Tenant in the conduct of
                    its business. If repairs cannot, in Landlord's sole opinion,
                    be made within one hundred twenty (120) days after the
                    occurrence of such damage without the payment of overtime or
                    other premiums, Landlord may, at its option, make them
                    within a reasonable time, and in such event, this Lease
                    shall continue in effect and Rent shall be abated in the
                    manner provided in the immediately preceding sentence. In
                    the case of repairs which, in Landlord's opinion, cannot be
                    made within such one hundred twenty (120) day period, or in
                    the event that sufficient insurance proceeds for repairs are
                    not available to Landlord, Landlord shall notify Tenant
                    within sixty (60) days of the date of occurrence of such
                    damage as to whether or not Landlord will make such repairs.
                    If Landlord elects not to make such repairs which cannot be
                    made within such one hundred twenty (120) day period, or for
                    which sufficient insurance proceeds are not available to
                    Landlord, then either party may, by written notice to the
                    other, terminate this Lea