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California-Sunnyvale-552 Del Rey Avenue Lease - Peery/Arrillaga and Protein Design Labs Inc.

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                                                                 BLDG:   Del Rey
                                                                 OWNER:  500
                                                                 PROP:   30
                                                                 UNIT:   1
                                                                 TENANT: 3007


                                LEASE AGREEMENT

        THIS LEASE, made this 20th day of February, 1997, between JOHN
ARRILLAGA, Trustee or his Successor Trustee, UTA dated 7/20/77 (ARRILLAGA
FAMILY TRUST) as amended, and RICHARD T. PEERY, Trustee, or his Successor
Trustee, UTA dated 7/20/77 (RICHARD T. PEERY SEPARATE PROPERTY TRUST) as
amended, hereinafter called Landlord, and PROTEIN DESIGN LABS, INC., a Delaware
corporation, hereinafter called Tenant.

                                  WITNESSETH:

        Landlord hereby leases to Tenant and Tenant hereby hires and takes from
Landlord those certain premises (the "Premises") outlined in red on Exhibit
"A", attached hereto and incorporated herein by this reference thereto more
particularly described as follows:

A portion of that certain 18,480+/- square foot, single-story building located
at 552 Del Rey Avenue, Sunnyvale, California 94086, consisting of approximately
6,688+/- square feet on the first floor of the building. Said Premises is more
particularly shown within the area outlined in Red on Exhibit A attached hereto.
The entire parcel, of which the Premises is a part, is shown within the area
outlined in Green on Exhibit A attached. The Premises is leased on an "as-is"
basis, in its present condition, and in the configuration as shown in Red on
Exhibit B attached hereto.

        The word "Premises" as used throughout this lease is hereby defined to
include (i) the laboratory fixtures located within the 6,688+/- square feet
leased by Tenant hereunder and as listed on Exhibit C attached hereto and (ii)
the nonexclusive use of landscaped areas, sidewalks and driveways in front of
or adjacent to the Premises, and the nonexclusive use of the area directly
underneath or over such sidewalks and driveways. The gross leasable area of the
building shall be measured from outside of exterior walls to outside of
exterior walls, and shall include any atriums, covered entrances or egresses
and covered loading areas.

        Said letting and hiring is upon and subject to the terms, covenants and
conditions hereinafter set forth and Tenant covenants as a material part of the
consideration for this Lease to perform and observe each and all of said terms,
covenants and conditions. This Lease is made upon the conditions of such
performance and observance.

1.  USE  Tenant shall use the Premises only in conformance with applicable
governmental laws, regulations, rules and ordinances for the purpose of general
office, light manufacturing, research and development, and storage and other
uses necessary for Tenant to conduct Tenant's business, provided that such uses
shall be in accordance with all applicable governmental laws and ordinances,
and for no other purpose. Tenant shall not do or permit to be done in or about
the Premises nor bring or keep or permit to be brought or kept in or about the
Premises anything which is prohibited by or will in any way increase the
existing rate of (or otherwise affect) fire or any insurance covering the
Premises or any part thereof, or any of its contents, or will cause a
cancellation of any insurance covering the Premises or any part thereof, or any
of its contents. Tenant shall not do or permit to be done anything in, on or
about the Premises which will in any way obstruct or interfere with the rights
of other tenants or occupants of the Premises or neighboring premises or injure
or annoy them, or use or allow the Premises to be used for any improper,
immoral, unlawful or objectionable purpose, nor shall Tenant cause, maintain or
permit any nuisance in, on or about the Premises. No sale by auction shall be
permitted on the Premises. Tenant shall not place any loads upon the floors,
walls, or ceiling which endanger the structure, or place any harmful fluids or
other materials in the drainage system of the building, or overload existing
electrical or other mechanical systems. No waste materials or refuse shall be
dumped upon or permitted to remain upon any part of the Premises or outside of
the building in which the Premises are a part, except in trash containers
placed inside exterior enclosures designated by Landlord for that purpose or
inside of the building proper where designated by Landlord. No materials,
supplies, equipment, finished products or semi-finished products, raw materials
or articles of any nature shall be stored upon or permitted to remain outside
the Premises. Tenant shall not place anything or allow anything to be placed
near the glass of any window, door partition or wall which may appear unsightly
from outside the Premises. No loudspeaker or other device, system or apparatus
which can be heard outside the Premises shall be used in or at the Premises
without the prior written consent of Landlord. Tenant shall not commit or
suffer to be committed any waste in or upon the Premises. Tenant shall
indemnify, defend and hold Landlord harmless against any loss, expense, damage,
reasonable attorneys' fees, or liability arising out of failure of Tenant to
comply with any applicable law. Tenant shall comply with any covenant,
condition, or restriction ("CC&R's") affecting the Premises. The provisions of
this paragraph are for the benefit of Landlord only and shall not be construed
to be for the benefit of any tenant or occupant of the Premises. There are no
CC&R's affecting the Premises at the time of Lease execution. In the event
CC&R's are subsequently implemented, Landlord shall provide a copy of said
CC&R's to Tenant.

2.  TERM*

    A.  The term of this Lease shall be for a period of THREE (3) years and
SEVENTEEN (17) days (unless sooner terminated as hereinafter provided) and,
subject to Paragraphs 28 and 3, shall commence on the 15th day of March, 1997
and end on the 31st day of March, 2000.

    B.  Possession of the Premises shall be deemed tendered and the term of the
Lease shall commence on March 15, 1997; or

        (d)  As otherwise agreed in writing.

                                                               Initials: 
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                                  page 1 of 8                  Initials:
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* It is agreed in the event said Lease commences on a date other than the first
  day of the month the term of the Lease will be extended to account for the
  number of days in the partial month. The Basic Rent during the resulting
  partial month will be pro-rated (for the number of days in the partial month)
  at the Basic Rent rate scheduled for the projected commencement date as shown
  in Paragraph 39.


<PAGE>   2
3.      POSSESSION  If Landlord, for any reason whatsoever, cannot deliver
possession of said premises to Tenant at the commencement of the said term, as
hereinbefore specified, this Lease shall not be void or voidable; no obligation
of Tenant shall be affected thereby; nor shall Landlord or Landlord's agents be
liable to Tenant for any loss or damage resulting therefrom; but in that event
the commencement and termination dates of the Lease, and all other dates
affected thereby shall be revised to conform to the date of Landlord's delivery
of possession, as specified in Paragraph 2B, above. The above is, however,
subject to the provision that the period of delay of delivery of the Premises
shall not exceed 60 days from the commencement date herein (except those delays
caused by Acts of God, strikes, war, utilities, governmental bodies, weather,
unavailable materials, and delays beyond Landlord's control shall be excluded in
calculating such period) in which instance Tenant, at its option, may, by
written notice to the Landlord, terminate this Lease.

4.      RENT

        A.  Basic Rent.  Tenant agrees to pay to Landlord at such place as
Landlord may designate without deduction, offset, prior notice, or demand, and
Landlord agrees to accept as Basic Rent for the leased Premises and total sum of
SEVEN HUNDRED TWENTY THOUSAND NINE HUNDRED ONE AND 68/100 Dollars ($720,901.68)
in lawful money of the United States of America, payable as follows:

                    See Paragraph 39 for Basic Rent Schedule

        B.  Time for Payment.  Full monthly rent is due in advance on the first
day of each calendar month. In the event that the term of this Lease commences
on a date other than the first day of a calendar month, on the date of
commencement of the term hereof Tenant shall pay to Landlord as rent for the
period from such date of commencement to the first day of the next succeeding
calendar month that proportion of the monthly rent hereunder which the number
of days between such date of commencement and the first day of the next
succeeding calendar month bears to thirty (30), in the event that the term of
this Lease for any reason ends on a date other than the last day of a calendar
month, on the first day of the last calendar month of the term hereof Tenant
shall pay to Landlord as rent for the period from said first day of said last
calendar month to and including the last day of the term hereof that proportion
of the monthly rent hereunder which the number of days between said first day
of said last calendar month and the last day of the term hereof bears to thirty
(30).

        C.  Late Charge.  Notwithstanding any other provision of this Lease, if
Tenant is in default in the payment of rental as set forth in this Paragraph 4
when due, or any part thereof, Tenant agrees to pay Landlord, in addition to
the delinquent rental due, a late charge for each rental payment in default ten
(10) days. Said late charge shall equal ten percent (10%) of each rental
payment so in default.

        D.  Additional Rent.  Beginning with the commencement date of the term
of this Lease, Tenant shall pay to Landlord or to Landlord's designated agent
in addition to the Basic Rent and as Additional Rent the following:

            (a) All Taxes relating to the Premises as set forth in Paragraph 9,
and
            (b) All insurance premiums relating to the Premises, as set forth
in Paragraph 12, and

            (c) All charges, costs and expenses, which Tenant is required to
pay hereunder, together with all interest and penalties, costs and expenses
including reasonable attorneys' fees and legal expenses, that may accrue
thereto in the event of Tenant's failure to pay such amounts, and all damages,
reasonable costs and expenses which Landlord may incur by reason of default of
Tenant or failure on Tenant's part to comply with the terms of this Lease. In
the event of nonpayment by Tenant of Additional Rent, Landlord shall have all
the rights and remedies with respect thereto as Landlord has for nonpayment of
rent.

        The Additional Rent due hereunder shall be paid to Landlord or
Landlord's agent (i) within five days for taxes and insurance and within thirty
days for all other Additional Rent items after presentation of invoice from
Landlord or Landlord's agent setting forth such Additional Rent and/or (ii) at
the option of Landlord, Tenant shall pay to Landlord monthly, in advance,
Tenant's prorata share of an amount estimated by Landlord to be Landlord's
approximate average monthly expenditure for such Additional Rent items, which
estimated amount shall be reconciled within 120 days of the end of each
calendar year or more frequently if Landlord elects to do so at Landlord's sole
and absolute discretion as compared to Landlord's actual expenditure for said
Additional Rent items, with Tenant paying to Landlord, upon demand, any amount
of actual expenses expended by Landlord in excess of said estimated amount, or
Landlord crediting to Tenant (providing Tenant is not in default in the
performance of any of the terms, covenants and conditions of this Lease) any
amount of estimated payments made by Tenant in excess of Landlord's actual
expenditures for said Additional Rent items.

        The respective obligations of Landlord and Tenant under this paragraph
shall survive the expiration or other termination of the term of this Lease,
and if the term hereof shall expire or shall otherwise terminate on a day other
than the last day of a calendar year, the actual Additional Rent incurred for
the calendar year in which the term hereof expires or otherwise terminates
shall be determined and settled on the basis of the statement of actual
Additional Rent for such calendar year and shall be prorated in the proportion
which the number of days in such calendar year preceding such expiration or
termination bears to 365.

        E.  Fixed Management Fee.  Beginning with the Commencement Date of the
Term of this Lease, Tenant shall pay to Landlord, in addition to the Basic Rent
and Additional Rent, a fixed monthly management fee ("Management Fee") equal
to 3% of the Basic Rent due for each month during the Lease Term.

        F.  Place of Payment of Rent and Additional Rent.  All Basic Rent
hereunder and all payments hereunder for Additional Rent shall be paid to
Landlord at the office of Landlord at PEERY/ARRILLAGA, File 1504, Box 60000,
San Francisco, CA 94160 or to such other person or to such other place as
Landlord may from time to time designate in writing.

        G.  Security Deposit.  Concurrently with Tenant's execution of this
Lease, Tenant shall deposit with Landlord the sum of FORTY THOUSAND ONE HUNDRED
TWENTY EIGHT AND NO/100 Dollars ($40,128.00). Said sum shall be held by
Landlord as a Security Deposit for the faithful performance by Tenant of all of
the terms, covenants, and conditions of this Lease to be kept and performed by
Tenant during the term hereof. If Tenant defaults with respect to any provision
of this Lease, including, but not limited to, the provisions relating to the
payment of rent and any of the monetary sums due herewith, Landlord may (but
shall not be required to) use, apply or retain all or any part of this Security
Deposit for the payment of any other amount which Landlord may spend by reason
of Tenant's default or to compensate Landlord for


                                  page 2 of 8
<PAGE>   3
any other loss or damage which Landlord may suffer by reason of Tenant's
default. If any portion of said Deposit is so used or applied, Tenant shall,
within ten (10) days after written demand therefor, deposit cash with Landlord
in the amount sufficient to restore the Security Deposit to its original
amount. Tenant's failure to do so shall be a material breach of this Lease.
Landlord shall not be required to keep this Security Deposit separate from its
general funds, and Tenant shall not be entitled to interest on such Deposit. If
Tenant fully and faithfully performs every provision of this Lease to be
performed by it, the Security Deposit or any balance thereof shall be returned
to Tenant (or at Landlord's option, to the last assignee of Tenant's interest
hereunder) at the expiration of the Lease term and after Tenant has vacated the
Premises. In the event of termination of Landlord's interest in this Lease,
Landlord shall transfer said Deposit to Landlord's successor in interest
whereupon Tenant agrees to release Landlord from liability for the return of
such Deposit or the accounting therefor.

5. ACCEPTANCE AND SURRENDER OF PREMISES  By entry hereunder, Tenant accepts the
Premises as being in good and sanitary order, condition and repair and accepts
the building and improvements included in the Premises in their present
condition and without representation or warranty by Landlord as to the condition
of such building or as to the use or occupancy which may be made thereof. Any
exceptions to the foregoing must be by written agreement executed by Landlord
and Tenant. Tenant agrees on the last day of the Lease term, or on the sooner
termination of this Lease, to surrender the Premises promptly and peaceably to
Landlord in good condition and repair (damage by Acts of God, fire, normal wear
and tear excepted), with all interior walls painted, or cleaned so that they
appear freshly painted, and repaired and replaced, if damaged; all floors
cleaned and waxed; all carpets cleaned and shampooed; all broken, marred or
nonconforming acoustical ceiling tiles replaced; all windows washed; the
airconditioning and heating systems serviced by a reputable and licensed
service firm and in good operating condition and repair; the plumbing and
electrical systems and lighting in good order and repair, including replacement
of any burned out or broken light bulbs or ballasts; the lawn and shrubs in good
condition including the replacement of any dead or damaged plantings; the
sidewalk, driveways and parking areas in good order, condition and repair;
together with all alterations, additions, and improvements which may have been
made in, to, or on the Premises (except moveable trade fixtures installed at the
expense of Tenant) except that Tenant shall ascertain from Landlord within
thirty (30) days before the end of the term of this Lease whether Landlord
desires to have the Premises or any part or parts thereof restored to their
condition and configuration as when the Premises were delivered to Tenant and if
Landlord shall so desire, then Tenant shall restore said Premises or such part
or parts thereof before the end of this Lease at Tenant's sole cost and expense.
Tenant, on or before the end of the term or sooner termination of this Lease,
shall remove all of Tenant's personal property and trade fixtures from the
Premises, and all property not so removed on or before the end of the term or
sooner termination of this Lease shall be deemed abandoned by Tenant and title
to same shall thereupon pass to Landlord without compensation to Tenant.
Landlord may, upon termination of this Lease, remove all moveable furniture and
equipment so abandoned by Tenant, at Tenant's sole cost, and repair any damage
caused by such removal at Tenant's sole cost. If the Premises be not surrendered
at the end of the term or sooner termination of this Lease, Tenant shall
indemnify Landlord against loss or liability resulting from the delay by Tenant
in so surrendering the Premises including, without limitation, any claims made
by any succeeding tenant founded on such delay. Nothing contained herein shall
be construed as an extension of the term hereof or as a consent of Landlord to
any holding over by Tenant. The voluntary or other surrender of this Lease or
the Premises by Tenant or a mutual cancellation of this Lease shall not work as
a merger and, at the option of Landlord, shall either terminate all or any
existing subleases or subtenancies or operate as an assignment to Landlord of
all or any such subleases or subtenancies.

6. ALTERATIONS AND ADDITIONS  Tenant shall not make, or suffer to be made, any
alteration or addition to the Premises, or any part thereof, without the
written consent of Landlord first had and obtained by Tenant (such consent not
to be unreasonably withheld), but at the cost of Tenant, and any addition to,
or alteration of, the Premises, except moveable furniture and trade fixtures,
shall at once become a part of the Premises and belong to Landlord. Landlord
reserves the right to approve all contractors and mechanics proposed by Tenant
to make such alterations and additions. Tenant shall retain title to all
moveable furniture and trade fixtures placed in the Premises. All heating,
lighting, electrical, airconditioning, floor to ceiling partitioning, drapery,
carpeting, and floor installations made by Tenant, together with all property
that has become an integral part of the Premises, shall not be deemed trade
fixtures. Tenant agrees that it will not proceed to make such alteration or
additions, without having obtained consent from Landlord to do so, and until
five (5) days from the receipt of such consent, in order that Landlord may post
appropriate notices to avoid any liability to contractors or material suppliers
for payment for Tenant's improvements. Tenant will at all times permit such
notices to be posted and to remain posted until the completion of work. Tenant
shall, if required by Landlord, secure at Tenant's own cost and expense, a
completion and lien indemnity bond, satisfactory to Landlord, for such work.
Tenant further covenants and agrees that any mechanic's lien filed against the
Premises for work claimed to have been done for, or materials claimed to have
been furnished to Tenant, will be discharged by Tenant, by bond or otherwise,
within ten (10) days after the filing thereof, at the cost and expense of
Tenant. Any exceptions to the foregoing must be made in writing and executed by
both Landlord and Tenant. Notwithstanding the above, Landlord agrees that the
following equipment installed and paid for by Tenant shall not be considered
trade fixtures and Tenant shall have the right to remove said equipment upon
Lease Termination. Tenant, at Tenant's sole cost and expense, shall be
responsible and liable for (i) complying with all permit and other governmental
regulations related to the installation and/or removal of said laboratory
equipment, and (ii) immediately restoring any and all damage to the Premises
resulting from the installation and/or removal of said laboratory equipment:
(1) Autoclave (sterilizer); (2) Vacuum Pump; and (3) Air Compressor.

7. TENANT MAINTENANCE  Tenant shall, at its sole cost and expense, keep and
maintain the Premises (including appurtenances) and every part thereof in a
high standard of maintenance and repair, and in good and sanitary condition.
Tenant's maintenance and repair responsibilities herein referred to include,
but are not limited to, janitorization, plumbing systems within the non-common
areas of the Premises (such as water and drain lines, sinks), electrical
systems within the non-common areas of the Premises (such as outlets, lighting
fixtures, lamps, bulbs, tubes, ballasts, heating and airconditioning controls
within the non-common areas of the Premises (such as mixing boxes, thermostats,
time clocks, supply and return grills), all interior improvements within the
premises including but not limited to: wall coverings, window coverings,
acoustical ceilings, vinyl tile, carpeting, partitioning, doors (both interior
and exterior, including closing mechanisms, latches, locks), and all other
interior improvements of any nature whatsoever. Tenant agrees to provide carpet
shields under all rolling chairs or to otherwise be responsible for wear and
tear of the carpet caused by such rolling chairs if such wear and tear exceeds
that caused by normal foot traffic in surrounding areas. Areas of excessive wear
shall be replaced at Tenant's sole expense upon Lease termination.

8. UTILITIES  See Paragraph 45.

9. TAXES

   A. As additional Rent and in accordance with Paragraph 4D of this Lease,
Tenant shall pay to Landlord, or if Landlord so directs, directly to the Tax
Collector, all Real Property Taxes relating to the Premises. In the event the
Premises leased hereunder consist of only a portion of the entire tax parcel,
Tenant shall pay to Landlord Tenant's proportionate share of such real estate
taxes allocated to the leased Premises by square footage or other reasonable
basis as calculated and determined by Landlord. If the tax billing pertains
100% to the leased Premises, and Landlord chooses to have Tenant pay said real
estate taxes directly to the Tax Collector, then in such event it shall be the
responsibility of Tenant to obtain the tax and assessment bills and pay, prior
to delinquency, the applicable real property taxes and assessments pertaining
to the leased Premises, and failure to receive a bill for taxes and/or
assessments shall not provide a basis for cancellation of or nonresponsibility
for payment of penalties for nonpayment or late payment by Tenant. The term
"Real Property Taxes", as used herein, shall mean (i) all taxes, assessments,
levies and other charges of any kind or nature whatsoever, general and special,
foreseen and unforeseen (including all installments of principal and interest
required to pay any general or special assessments for public improvements and
any increases resulting from reassessments caused by any change in ownership of
the Premises) now or  hereafter imposed by any governmental or quasi-
governmental authority or special district having the direct or indirect power
to tax or levy assessments, which are levied or assessed against, or with
respect to the value, occupancy or use of, all or any portion of the Premises
(as now constructed or as may at any time hereafter be constructed, altered,
or otherwise changed) or Landlord's interest therein; any improvements located
within the Premises (regardless of ownership); the fixtures, equipment and
other property of Landlord, real or personal, that are an integral part of and
located in the Premises; or parking areas, public utilities, or energy within
the Premises; (ii) all charges, levies or fees imposed by reason of
environmental regulation or other governmental control of the Premises; and
(iii) all costs and fees (including





                                                                Initials:_______

                                                                Initials:_______

                                  Page 3 of 8
<PAGE>   4
reasonable attorney's fees) incurred by Landlord in reasonably contesting any
Real Property Tax and in negotiating with public authorities as to any Real
Property Tax. If at any time during the term of this Lease the taxation or
assessment of the Premises prevailing as of the commencement date of this Lease
shall be altered so that in lieu of or in addition to any Real Property Tax
described above there shall be levied, assessed or imposed (whether by reason of
a change in the method of taxation or assessment, creation of a new tax or
charge, or any other cause) an alternate or additional tax or charge (i) on the
value, use or occupancy of the Premises or Landlord's interest therein or (ii)
on or measured by the gross receipts, income or rentals from the Premises, on
Landlord's business of leasing the Premises, or computed in any manner with
respect to the operation of the Premises, then any such tax or charge, however
designated, shall be included within the meaning of the term "Real Property
Taxes" for purposes of this Lease, if any Real Property Tax is based upon
property or rents unrelated to the Premises, then only that part of such Real
Property Tax that is fairly allocable to the Premises shall be included within
the meaning of the term "Real Property Taxes". Notwithstanding the foregoing,
the term "Real Property Taxes" shall not include estate, inheritance, gift or
franchise taxes of Landlord or the federal or state net income tax imposed on
Landlord's income from all sources.

9.  Taxes on Tenant's Property  Tenant shall be liable for and shall pay ten
days before delinquency, taxes levied against any personal property or trade
fixtures placed by Tenant in or about the Premises. If any such taxes on
Tenant's personal property or trade fixtures are levied against Landlord or
Landlord's property or if the assessed value of the Premises is increased by the
inclusion therein of a value placed upon such personal property or trade
fixtures of Tenant and if Landlord, after written notice to Tenant, pays the
taxes based on such increased assessment, which Landlord shall have the right to
do regardless of the validity thereof, but only under proper protest if
requested by Tenant, Tenant shall upon demand, as the case may be, repay to
Landlord the taxes so levied against Landlord, or the proportion of such taxes
resulting from such increase in the assessment; provided that in any such event
Tenant shall have the right, in the name of Landlord and with Landlord's full
cooperation, to bring suit in any court of competent jurisdiction to recover the
amount of such taxes so paid under protest, and any amount so recovered shall
belong to Tenant.

10.  LIABILITY INSURANCE  Tenant, at Tenant's expense, agrees to keep in force
during the term of this Lease a policy of commercial general liability insurance
with combined single limit coverage of not less than Two Million Dollars
($2,000,000), per occurrence for bodily injury and property damage occurring in,
on or about the Premises, including parking and landscaped areas. Such insurance
shall be primary and noncontributory as respects any insurance carried by
Landlord. The policy or policies effecting such insurance shall name Landlord as
additional insureds, and shall insure any liability of Landlord, contingent or
otherwise, as respects acts or omissions of Tenant, its agents, employees or
invitees or otherwise by any conduct or transactions of any of said persons in
or about or concerning the Premises, including any failure of Tenant to observe
or perform any of its obligations hereunder; shall be issued by an insurance
company admitted to transact business in the State of California; and shall
provide that the insurance effected thereby shall not be cancelled, except upon
thirty (30) days' prior written notice to Landlord. A certificate of insurance
of said policy shall be delivered to Landlord, if, during the term of this
Lease, in the considered opinion of Landlord's Lender, insurance advisor, or
counsel, the amount of insurance described in this Paragraph 10 is not adequate.
Tenant agrees to increase said coverage to such reasonable amount as Landlord's
Lender, insurance advisor, or counsel shall deem adequate.

11.  TENANT'S PERSONAL PROPERTY INSURANCE AND WORKMAN'S COMPENSATION INSURANCE
Tenant shall maintain a policy or policies of fire and property damage insurance
in "all risk" form with a sprinkler leakage endorsement insuring the personal
property, inventory, trade fixtures, and leasehold improvements within the lease
Premises for the full replacement value thereof. The proceeds from any of such
policies shall be used for the repair or replacement of such items so insured.

        Tenant shall also maintain a policy or policies of workman's
compensation insurance and any other employee benefit insurance sufficient to
comply with all laws.

12.  PROPERTY INSURANCE   Landlord shall purchase and keep in force, and as
Additional Rent and in accordance with Paragraph 4D of this Lease, Tenant shall
pay to Landlord (or Landlord's agent if so directed by Landlord) Tenant's
proportionate share (allocated to the lease Premises by square footage or other
equitable basis as calculated and determined by Landlord) of the deductibles on
insurance claims and the cost of, policy or policies of insurance covering loss
or damage to the Premises (excluding routine maintenance and repairs and
incidental damage or destruction caused by accidents or vandalism for which
Tenant is responsible under Paragraph 7) in the amount of the full replacement
value thereof, providing protection against those perils included within the
classification of "all risks" insurance and flood and/or earthquake insurance,
if available, plus a policy of rental income insurance in the amount of one
hundred (100%) percent of twelve (12) months Basic Rent, plus sums paid as
Additional Rent. If such insurance cost is increased due to Tenant's use of the
Premises, Tenant agrees to pay to Landlord the full cost of such increase.
Tenant shall have no interest in nor any right to the proceeds of any insurance
procured by Landlord for the Premises.

        Landlord and Tenant do each hereby respectively release the other, to
the extent of insurance coverage of the releasing party, from any liability for
loss or damage caused by fire or any of the extended coverage casualties
included in the releasing party's insurance policies, irrespective of the cause
of such fire or casualty; provided, however, that if the insurance policy of
either releasing party prohibits such waiver, then this waiver shall not take
effect until consent to such waiver is obtained. If such waiver is so
prohibited, the insured party affected shall promptly notify the other party
thereof.

13.  INDEMNIFICATION  Landlord shall not be liable to Tenant and Tenant hereby
waives all claims against Landlord for any injury to or death of any person or
damage to or destruction of property in or about the Premises by or from any
cause whatsoever, including, without limitation, gas, fire, oil, electricity or
leakage of any character from the roof, walls, basement or other portion of the
Premises but excluding, however, the willful misconduct or negligence of
Landlord, its agents, servants, employees, invitees, or contractors of which
negligence Landlord has knowledge and reasonable time to correct. Except as to
injury to persons or damage to property to the extent arising from the willful
misconduct or the negligence of Landlord, its agents, servants, employees,
invitees, or contractors, Tenant shall hold Landlord harmless from and defend
Landlord against any and all expenses, including reasonable attorney's fees, in
connection therewith, arising out of any injury to or death of any person or
damage to or destruction of property occurring in, on or about the Premises, or
any part thereof, from any cause whatsoever.

14.  COMPLIANCE  Tenant, at its sole cost and expense, shall promptly comply
with all laws, statutes, ordinances and governmental rules, regulations or
requirements now or hereinafter in effect; with the requirements of any board of
fire underwriters or other similar body now or hereafter constituted; and with
any direction or occupancy certificate issued pursuant to law by any public
officer; provided, however, that no such failure shall be deemed a breach of the
provisions if Tenant, immediately upon notification, commences to remedy or
rectify said failure. The judgment of any court of competent jurisdiction or the
admission of Tenant in any action against Tenant, whether Landlord be a party
thereto or not, that Tenant has violated any such law, statute, ordinance or
governmental rule, regulation, requirement, direction or provision, shall be
conclusive of that fact as between Landlord and Tenant. Tenant shall, at its
sole cost and expense, comply with any and all requirements pertaining to said
Premises, of any insurance organization or company, necessary for the
maintenance of reasonable fire and public liability insurance covering
requirements pertaining to said Premises.

15.  LIENS  Tenant shall keep the Premises free from any liens arising out of
any work performed, materials furnished or obligation incurred by Tenant. In the
event that Tenant shall not, within ten (10) days following the imposition of
such lien, cause the same to be released of record, Landlord shall have, in
addition to all other remedies provided herein and by law, the right, but no
obligation, to cause the same to be released by such means as it shall deem
proper, including payment of the claim giving rise to such lien. All sums paid
by Landlord for such purpose, and all expenses incurred by it in connection
therewith, shall be payable to Landlord by Tenant on demand with interest at the
prime rate of interest as quoted by the Bank of America.

16.  ASSIGNMENT AND SUBLETTING  Tenant shall not assign, transfer, or
hypothecate the leasehold estate under this Lease, or any interest therein, and
shall not sublet the Premises, or any part thereof, or any right or privilege
appurtenant thereto, or suffer any other person or entity to occupy or use the
Premises, or any portion thereof, without, in each case, the prior written
consent of Landlord which consent will not be unreasonably withheld. As a
condition for granting this consent to any assignment, transfer, or subletting,
Landlord shall require Tenant to pay to Landlord, as Additional Rent, fifty
percent (50%) of all rents and/or additional consideration due Tenant from its
assignees, transferees, or subtenants in excess of the Rent payable by Tenant to
Landlord hereunder for the assigned, transferred and/or subleased space
provided, however, that before sharing such excess rent, Tenant shall first be
entitled to recover from such excess rent the amount of any reasonable leasing
commissions paid by Tenant to third parties not affiliated with Tenant. Tenant
shall, by thirty (30) days written notice, advise Landlord of its intent to
assign or transfer Tenant's interest in the Lease or sublet the Premises or any
portion thereof for any part of the term hereof. Within thirty (30) days after
receipt of said written notice, Landlord may, in its sole discretion, elect to
terminate this Lease as to the portion of the Premises described in Tenant's
notice on the date specified in Tenant's notice by giving written notice of such
election to terminate. If no such notice to terminate is given to Tenant within
said accordance with the terms, covenants, and conditions of this paragraph 16.
If Tenant intends to sublet the entire Premises and Landlord elects to terminate
this Lease, this Lease shall be terminated on the date specified in Tenant's
notice. If, however, this Lease shall terminate pursuant to the foregoing with
respect to less than all the Premises, the rent, as defined and reserved
hereinabove shall be adjusted on a pro rata basis to the number of square feet
retained by Tenant and this Lease as so amended shall continue in full force and
effect. In the event Tenant is allowed to assign, transfer or sublet the whole
or any part of the Premises, with the prior written

                                  page 4 of 8                   Initials: ______

<PAGE>   5
consent of Landlord, no assignee, transferee or subtenant shall assign or
transfer this Lease, either in whole or in part, or sublet the whole or any part
of the Premises, without also having obtained the prior written consent of
Landlord.  A consent of Landlord to one assignment, transfer, hypothecation,
subletting, occupation or use by any other person shall not release Tenant from
any of Tenant's obligations hereunder or be deemed to be a consent to any
subsequent similar or dissimilar assignment, transfer, hypothecation,
subletting, occupation or use by any other person.  Any such assignment,
transfer, hypothecation, subletting, occupation or use without such consent
shall be void and shall constitute a breach of this Lease by Tenant and shall,
at the option of Landlord exercised by written notice to Tenant, terminate this
Lease.  The leasehold estate under this Lease shall not, nor shall any interest
therein, be assignable for any purpose by operation of law without the written
consent of Landlord.  As a condition to its consent, Landlord shall require
Tenant to pay all expenses in connection with the assignment, and Landlord shall
require Tenant's assignee or transferee (or other assignees or transferees) to
assume in writing all of the obligations under this Lease and for Tenant to
remain liable to Landlord under the Lease.  Notwithstanding the above, in no
event will Landlord consent to a sub-sublease.  See Paragraph 48.

17.  SUBORDINATION AND MORTGAGES  In the event Landlord's title or leasehold
interest is now or hereafter encumbered by a deed of trust, upon the interest of
Landlord in the land and buildings in which the demised Premises are located, to
secure a loan from a lender (hereinafter referred to as "Lender") to Landlord,
Tenant shall, at the request of Landlord or Lender, execute in writing an
agreement subordinating its rights under this Lease to the lien of such deed of
trust, or, if so requested, agreeing that the lien of Lender's deed of trust
shall be or remain subject and subordinate to the rights of Tenant under this
Lease.  Notwithstanding any such subordination, Tenant's possession under this
Lease shall not be disturbed if Tenant is not in default and so long as Tenant
shall pay all rent and observe and perform all of the provisions set forth in
this Lease.

18.  ENTRY BY LANDLORD  Landlord reserves, and shall at all reasonable times
after at least 24 hours notice (except in emergencies) have, the right to enter
the Premises to inspect them; to perform any services to be provided by Landlord
hereunder; to make repairs or provide any services to a contiguous tenant(s); to
submit the Premises to prospective purchasers, mortgagers or tenants; to post
notices of nonresponsibility; and to alter, improve or repair the Premises or
other parts of the building, all without abatement of rent, and may erect
scaffolding and other necessary structures in or through the Premises where
reasonably required by the character of the work to be performed; provided,
however, that the business of Tenant shall be interfered with to the least
extent that is reasonably practical.  Any entry to the Premises by Landlord for
the purposes provided for herein shall not under any circumstances be construed
or deemed to be a forcible or unlawful entry into or a detainer of the Premises
or an eviction, actual or constructive, of Tenant from the Premises or any
portion thereof.

19.  BANKRUPTCY AND DEFAULT  The commencement of a bankruptcy action or
liquidation action or reorganization action or insolvency action or an
assignment of or by Tenant for the benefit of creditors, or any similar action
undertaken by Tenant, or the insolvency of Tenant, shall, at Landlord's option,
constitute a breach of this Lease by Tenant.  If the trustee or receiver
appointed to serve during a bankruptcy, liquidation, reorganization, insolvency
or similar action elects to reject Tenant's unexpired Lease, the trustee or
receiver shall notify Landlord in writing of its election within thirty (30)
days after an order for relief in a liquidation action or within thirty (30)
days after the commencement of any action.

        Within thirty (30) days after the court approval of the assumption of
this Lease, the trustee or receiver shall cure (or provide adequate assurance to
the reasonable satisfaction of Landlord that the trustee or receiver shall
cure) any and all previous defaults under the unexpired Lease and shall
compensate Landlord for all actual pecuniary loss and shall provide adequate
assurance of future performance under said Lease to the reasonable satisfaction
of Landlord.  Adequate assurance of future performance, as used herein,
includes, but shall not be limited to:  (i) assurance of source and payment of
rent, and other consideration due under this Lease; (ii) assurance that the
assumption or assignment of this Lease will not breach substantially any
provision, such as radius, location, use, or exclusivity provision, in any
agreement relating to the above described Premises.

        Nothing contained in this section shall affect the existing right of
Landlord to refuse to accept an assignment upon commencement of or in connection
with a bankruptcy, liquidation, reorganization or insolvency action or an
assignment of Tenant for the benefit of creditors or other similar act.  Nothing
contained in this Lease shall be construed as giving or granting or creating an
equity in the demised Premises to Tenant.  In no event shall the leasehold
estate under this Lease, or any interest therein, be assigned by voluntary
bankruptcy proceeding without the prior written consent of Landlord.  In no
event shall this Lease or any rights or privileges hereunder be an asset of
Tenant under any bankruptcy, insolvency or reorganization proceedings.

        The failure to perform or honor any covenant, condition or
representation made under this Lease shall constitute a default hereunder by
Tenant upon expiration of the appropriate grace period hereinafter provided.
Tenant shall have a period of five (5) days from the date of written notice
from Landlord within which to cure any default in the payment of rental or
adjustment thereto.  Tenant shall have a period of thirty (30) days from the
date of written notice from Landlord within which to cure any other default
under this Lease; provided, however, that if the nature of Tenant's failure is
such that more than thirty (30) days is reasonably required to cure the same,
Tenant shall not be in default so long as Tenant commences performance within
such thirty (30) day period and thereafter prosecutes the same to completion.
Upon an uncured default of this Lease by Tenant, Landlord shall have the
following rights and remedies in addition to any other rights or remedies
available to Landlord at law or in equity:

        (a)  The rights and remedies provided for by California Civil Code
Section 1951.2, including but not limited to, recovery of the worth at the time
of award of the amount by which the unpaid rent for the balance of the term
after the time of award exceeds the amount of rental loss for the same period
that Tenant proves could be reasonably avoided, as computed pursuant to
subsection (b) of said Section 1951.2.  Any proof by Tenant under subparagraphs
(2) and (3) of Section 1951.2 of the California Civil Code of the amount of
rental loss that could be reasonably avoided shall be made in the following
manner. Landlord and Tenant shall each select a licensed real estate broker in
the business of renting property of the same type and use as the Premises and in
the same geographic vicinity.  Such two real estate brokers shall select a third
licensed real estate broker, and the three licensed real estate brokers so
selected shall determine the amount of the rental loss that could be reasonably
avoided from the balance of the term of this Lease after the time of award. The
decision of the majority of said licensed real estate brokers shall be final and
binding upon the parties hereto.

        (b)  The rights and remedies provided by California Civil Code Section
which allows Landlord to continue the Lease in effect and to enforce all of its
rights and remedies under this Lease, including the right to recover rent as it
becomes due, for so long as Landlord does not terminate Tenant's right to
possession; acts of maintenance or preservation, efforts to relet the Premises,
or the appointment of a receiver upon Landlord's initiative to protect its
interest under this Lease shall not constitute a termination of Tenant's
right to possession.

        (c)  The right to terminate this Lease by giving notice to Tenant in
accordance with applicable law.

        (d)  To the extent permitted by law, the right and power to enter the
Premises and remove therefrom all persons and property, to store such property
in a public warehouse or elsewhere at the cost of and for the account of Tenant,
and to sell such property and apply such proceeds therefrom pursuant to
applicable California law, Landlord may from time to time sublet the Premises or
any part thereof for such term or terms (which may extend beyond the term of
this Lease) and at such rent and such other terms as Landlord in its reasonable
sole discretion may deem advisable, with the right to make alterations and
repairs to the Premises.  Upon each subletting, (i) Tenant shall be immediately
liable to pay Landlord, in addition to indebtedness other than rent due
hereunder, the reasonable cost of such subletting, including, but not limited
to, reasonable attorneys' fees, and any real estate commissions actually paid,
and the cost of such reasonable alterations and repairs incurred by Landlord and
the amount, if any, by which the rent hereunder for the period of such
subletting (to the extent such period does not exceed the term hereof) exceeds
the amount to be paid as rent for the Premises for such period or (ii) at the
option of Landlord, rents received from such subletting shall be applied first
to payment of indebtedness other than rent due hereunder from Tenant to
Landlord; second, to the payment of any costs of such subletting and of such
alterations and repairs; third to payment of rent due and unpaid hereunder; and
the residue, if any, shall be held by Landlord and applied in payment of future
rent as the same becomes due hereunder. If Tenant has been credited with any
rent to be received by such subletting under option (i) and such rent shall not
be promptly paid to Landlord by the subtenant(s), or if such rentals received
from such subletting under option (ii) during any month be less than that to be
paid during that month by Tenant hereunder, Tenant shall pay any such deficiency
to Landlord.  Such deficiency shall be calculated and paid monthly. No taking
possession of the Premises by the Landlord shall be construed as an election on
its part to terminate this Lease unless a written notice of such intention be
given to Tenant.  Notwithstanding any such subletting without termination,
Landlord may at any time hereafter elect to terminate this Lease for such
previous breach.

        (e)  The right to have a receiver appointed for Tenant upon application
by Landlord, to take possession of the Premises and to apply any rental
collected from the Premises and to exercise all other rights and remedies
granted to Landlord pursuant to subparagraph d. above.

20.  ABANDONMENT  Tenant shall not vacate or abandon the Premises at any time
during the term of this Lease (except that Tenant may vacate so long as it pays
rent, provides an on-site security guard during normal business hours from
Monday through Friday, and otherwise performs its obligations hereunder) and if
Tenant shall abandon, vacate or surrender said Premises, or be dispossessed by
the process of law, or otherwise, any personal property belonging to Tenant and
left on the Premises shall be deemed to be abandoned, at the option of
Landlord, except such property as may be mortgaged to Landlord.

21.  DESTRUCTION  In the event the Premises are destroyed in whole or in part
from any cause, except for routine maintenance and repairs and incidental


                                  page 5 of 8
<PAGE>   6
damage and destruction caused from vandalism and accidents for which Tenant is
responsible under Paragraph 7, Landlord may, at its option:
        (a) Rebuild or restore the Premises to their condition prior to the
damage or destruction, or
        (b) Terminate this Lease. (providing that the Premises is damaged to
the extent of 33 1/3% of the replacement cost)
  If Landlord does not give Tenant notice in writing within thirty (30) days
from the destruction of the Premises of its election to either rebuild and
restore them, or to terminate this Lease, Landlord shall be deemed to have
elected to rebuild or restore them, in which event Landlord agrees, at its
expense except for any deductible, which is the responsibility of Tenant,
promptly to rebuild or restore the Premises to their condition prior to the
damage or destruction. Tenant shall be entitled to a reduction in rent while
such repair is being made in the proportion that the area of the Premises
rendered untenantable by such damage bears to the total area of the Premises.
If Landlord initially estimates that the rebuilding or restoration will exceed
180 days or if Landlord does not complete the rebuilding or restoration within
one hundred eighty (180) days following the date of destruction (such period of
time to be extended for delays caused by the fault or neglect of Tenant or
because of Acts of God, acts of public agencies, labor disputes, strikes,
fires, freight embargos, rainy or stormy weather, inability to obtain
materials, supplies or fuels, acts of contractors or subcontractors, or delay
of the contractors or subcontractors due to such causes or other contingencies
beyond the control of Landlord), then Tenant shall have the right to terminate
this Lease by giving fifteen (15) days prior written notice to Landlord.
Notwithstanding anything herein to the contrary, Landlord's obligation to
rebuild or restore shall be limited to the building and interior improvements
constructed by Landlord as they existed as of the commencement date of the
Lease and shall not include restoration of Tenant's trade fixtures, equipment,
merchandise, or any improvements, alterations or additions made by Tenant to
the Premises, which Tenant shall forthwith replace or fully repair at Tenant's
sole cost and expense provided this Lease is not cancelled according to the
provisions above.
   Unless this Lease is terminated pursuant to the foregoing provisions, this
Lease shall remain in full force and effect. Tenant hereby expressly waives the
provisions of Section 1932, Subdivision 2, in Section 1933, Subdivision 4 of
the California Civil Code.
   In the event that the building in which the Premises are situated is damaged
or destroyed to the extent of not less than 33 1/3% of the replacement cost
thereof, Landlord may elect to terminate this Lease, whether the Premises be
injured or not. Notwithstanding anything to the contrary herein, Landlord may
terminate this Lease in the event of an uninsured event or if insurance
proceeds are insufficient to cover one hundred percent of the rebuilding costs
net of the deductible.

22. EMINENT DOMAIN  If all or any part of the Premises shall be taken by any
public or quasi-public authority under the power of eminent domain or
conveyance in lieu thereof, this Lease shall terminate as to any portion of the
Premises so taken or conveyed on the date when title vests in the condemnor,
and Landlord shall be entitled to any and all payment, income, rent, award, or
any interest therein whatsoever which may be paid or made in connection with
such taking or conveyance, and Tenant shall have no claim against Landlord or
otherwise for the value of any unexpired term of this Lease. Notwithstanding
the foregoing paragraph, any compensation specifically awarded Tenant for loss
of business, Tenant's personal property, moving cost or loss of goodwill, shall
be and remain the property of Tenant.
   If any action or proceeding is commenced for such taking of the Premises or
any part thereof, or if Landlord is advised in writing by any entity or body
having the right or power of condemnation of its intention to condemn the
premises or any portion thereof, then Landlord shall have the right to
terminate this Lease by giving Tenant written notice thereof within sixty (60)
days of the date of receipt of said written advice, or commencement of said
action or proceeding, or taking conveyance, which termination shall take place
as of the first to occur of the last day of the calendar month next following
the month in which such notice is given or the date on which title to the
Premises shall vest in the condemnor.
   In the event of such a partial taking or conveyance of the Premises, if the
portion of the Premises taken or conveyed is so substantial that the Tenant can
no longer reasonably conduct its business, Tenant shall have the privilege of
terminating this Lease within sixty (60) days from the date of such taking or
conveyance, upon written notice to Landlord of its intention so to do, and upon
giving of such notice this Lease shall terminate on the last day of the
calendar month next following the month in which such notice is given, upon
payment by Tenant of the rent from the date of such taking or conveyance to the
date of termination.
   If a portion of the Premises be taken by condemnation or conveyance in lieu
thereof and neither Landlord nor Tenant shall terminate this Lease as provided
herein, this Lease shall continue in full force and effect as to the part of
the Premises not so taken or conveyed, and the rent herein shall be apportioned
as of the date of such taking or conveyance so that thereafter the rent to be
paid by Tenant shall be in the ratio that the area of the portion of the
Premises not so taken or conveyed bears to the total area of the Premises prior
to such taking.

23. SALE OR CONVEYANCE BY LANDLORD  In the event of a sale or conveyance of the
Premises or any interest therein, by any owner of the reversion then
constituting Landlord, the transferor shall thereby be released from any
further liability upon any of the terms, covenants or conditions (express or
implied) herein contained in favor of Tenant, and in such event, insofar as
such transfer is concerned, Tenant agrees to look solely to the responsibility
of the successor in interest of such transferor in and to the Premises and this
Lease. This Lease shall not be affected by any such sale or conveyance, and
Tenant agrees to attorn to the successor in interest of such transferor.

24. ATTORNMENT TO LENDER OR THIRD PARTY  In the event the interest of Landlord
in the land and buildings in which the leased Premises are located (whether
such interest of Landlord is a fee title interest or a leasehold interest) is
encumbered by deed of trust, and such interest is acquired by the lender or any
third party through judicial foreclosure or by exercise of a power of sale at
private trustee's foreclosure sale, Tenant hereby agrees to attorn to the
purchaser at any such foreclosure sale and to recognize such purchaser as the
Landlord under this Lease. In the event the lien of the deed of trust securing
the loan from a Lender to Landlord is prior and paramount to the Lease, this
Lease shall nonetheless continue in full force and effect for the remainder of
the unexpired term hereof, at the same rental herein reserved and upon all the
other terms, conditions and covenants herein contained.

25. HOLDING OVER  Any holding over by Tenant after expiration or other
termination of the term of this Lease with the written consent of Landlord
delivered to Tenant shall not constitute a renewal or extension of the Lease or
give Tenant any rights in or to the leased Premises except as expressly
provided in this Lease. Any holding over after the expiration or other
termination of the term of this Lease, with the consent of Landlord, shall be
construed to be a tenancy from month to month, on the same terms and conditions
herein specified insofar as applicable expect that the monthly Basic Rent shall
be increased to an amount equal to one hundred fifty (150%) percent of the
monthly Basic Rent required during the last month of the Lease term.

26. CERTIFICATE OF ESTOPPEL  Tenant shall at any time upon not less than ten
(10) days prior written notice from Landlord execute, acknowledge and deliver
to Landlord a statement in writing (i) certifying that this Lease is unmodified
and in full force and effect (or, if modified, stating the nature of such
modification and certifying that this Lease, as so modified, is in full force
and effect) and the date to which the rent and other charges are paid in
advance, if any, and (ii) acknowledging that there are not, to Tenant's
knowledge, any uncured defaults on the part of Landlord hereunder, or
specifying such defaults, if any, are claimed. Any such statement may be
conclusively relied upon by any prospective purchaser or encumbrancer of the
Premises. Tenant's failure to deliver such statement within such time shall be
conclusive upon Tenant that this Lease is in full force and effect, without
modification except as may be represented by Landlord; that there are no
uncured defaults in Landlord's performance, and that not more than one month's
rent has been paid in advance.

27. CONSTRUCTION CHANGES  It is understood that the description of the Premises
and the location of ductwork, plumbing and other facilities therein are subject
to such minor changes as Landlord or Landlord's architect determines to be
desirable in the course of construction of the Premises, and no such changes
shall affect this Lease or entitle Tenant to any reduction of rent hereunder or
result in any liability of Landlord to Tenant. Landlord does not guarantee the
accuracy of any drawings supplied to Tenant and verification of the accuracy of
such drawings rests with Tenant.

28. RIGHT OF LANDLORD TO PERFORM  All terms, covenants and conditions of this
Lease to be performed or observed by Tenant shall be performed or observed by
Tenant at Tenant's sole cost and expense and without any reduction of rent. If
Tenant shall fail to pay any sum of money, or other rent, required to be paid
by it hereunder and such failure shall continue for five (5) days after written
notice by Landlord, or shall fail to perform any other term or covenant
hereunder on its part to be performed, and such failure shall continue for
thirty (30) days after written notice thereof by Landlord, Landlord, without
waiving or releasing Tenant from any obligation of Tenant hereunder, may, but
shall not be obliged to, make any such payment or perform any such other term
or covenant on Tenant's part to be performed. All sums so paid by Landlord and
all necessary costs of such performance by Landlord together with interest at
the rate of the prime rate of interest per annum as quoted by the Bank of
America from the date of such payment on performance by Landlord, shall be paid
(and Tenant covenants to make such payment) to Landlord on demand by Landlord,
and Landlord shall have (in addition to any other right or remedy of Landlord)
the same rights and remedies in the event of nonpayment by Tenant as in the
case of failure by Tenant in the payment of rent hereunder.

28. ATTORNEY'S FEES
    A. In the event that either Landlord or Tenant should bring suit for the
possession of the Premises, for the recovery of any sum due under this Lease,
or because of the breach of any provision of this Lease, or for any other
relief against the other party hereunder, then all costs and expenses,
including reasonable attorney's fees,


                                                            Initials:
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                                  page 6 of 8               Initials:
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<PAGE>   7
incurred by the prevailing party therein shall be paid by the other party,
which obligation on the part of the other party shall be deemed to have
accrued on the date of the commencement of such action and shall be enforceable
whether or not the action is prosecuted to judgment.

        B. Should Landlord be named as a defendant in any suit brought against
Tenant in connection with or arising out of Tenant's occupancy hereunder,
Tenant shall pay to Landlord its costs and expenses incurred in such suit,
including a reasonable attorney's fee.

30. WAIVER.  The waiver by either party of the other party's failure to perform
or observe any term, covenant or condition herein contained to be performed or
observed by such waiving party shall not be deemed to be a waiver of such term,
covenant or condition or of any subsequent failure of the party failing to
perform or observe the same or any other such term, covenant or condition
therein contained, and no custom or practice which may develop between the
parties hereto during the term hereof shall be deemed a waiver of, or in any
way affect, the right of either party to insist upon performance and observance
by the other party in strict accordance with the terms hereof.

31. NOTICES.  All notices, demands, requests, advices or designations which may
be or are required to be given by either party to the other hereunder shall be
in writing. All notices, demands, requests, advices or designations by Landlord
to Tenant shall be sufficiently given, made or delivered if personally served
on Tenant by leaving the same at the Premises of if sent by United States
certified or registered mail, postage prepaid, addressed to Tenant at 2375
Garcia Avenue, Mountain View, CA 94043, Attn: Vice President, Corporate
Services and Licensing or CFO. All notices, demands, requests, advices or
designations by Tenant to Landlord shall be sent by United States certified or
registered mail, postage prepaid, addressed to Landlord at its offices at
PEERY/ARRILLAGA, 2560 Mission College Blvd., Suite 101, Santa Clara, CA 95054
Each notice, request, demand, advice or designation referred to in this
paragraph shall be deemed received on the date of the personal service or
mailing thereof in the manner herein provided, as the case may be.

32. EXAMINATION OF LEASE  Submission of this instrument for examination or
signature by Tenant does not constitute a reservation of or option for a lease,
and this instrument is not effective as a lease or otherwise until its
execution and delivery by both Landlord and Tenant.

33. DEFAULT BY LANDLORD  Landlord shall not be in default unless Landlord fails
to perform obligations required of Landlord within a reasonable time, but in no
event earlier than (30) days after written notice by Tenant to Landlord and to
the holder of any first mortgage or deed of trust covering the Premises whose
name and address shall have heretofore been furnished to Tenant in writing,
specifying wherein Landlord has failed to perform such obligations; provided,
however, that if the nature of Landlord's obligations is such that more than
thirty (30) days are required for performance, then Landlord shall not be in
default if Landlord commences performance within such thirty (30) day period
and thereafter diligently prosecutes the same to completion.

34. CORPORATE AUTHORITY  If Tenant is a corporation (or a partnership), each
individual executing this Lease on behalf of said corporation (or partnership)
represents and warrants that he is duly authorized to execute and deliver this
Lease on behalf of said corporation (or partnership) in accordance with the
by-laws of said corporation (or partnership in accordance with the partnership
agreement) and that this Lease is binding upon said corporation (or partnership)
in accordance with its terms. If Tenant is a corporation, Tenant shall, within
thirty (30) days after execution of this Lease, deliver to Landlord a certified
copy of the resolution of the Board of Directors of said corporation authorizing
or ratifying the execution of this Lease.

36. LIMITATION OF LIABILITY  In consideration of the benefits accruing
hereunder, Tenant and all successors and assigns covenant and agree that, in the
event of any actual or alleged failure, breach or default hereunder by Landlord:

        (a) the sole and exclusive remedy shall be against Landlord's interest
in the Premises leased herein;

        (b) no partner of Landlord shall be sued or named as a party in any suit
or action (except as may be necessary to secure jurisdiction of the
partnership);

        (c) no service of process shall be made against any partner of Landlord
(except as may be necessary to secure jurisdiction of the partnership);

        (d) no partner of Landlord shall be required to answer or otherwise
plead to any service of process;

        (e) no judgment will be taken against any partner of Landlord;

        (f) any judgment taken against any partner of Landlord may be vacated
and set aside at any time without hearing;

        (g) no writ of execution will ever be levied against the assets of any
partner of Landlord;

        (h) these covenants and agreements are enforceable both by Landlord and
also by any partner of Landlord.

        Tenant agrees that each of the foregoing covenants and agreements shall
be applicable to any covenant or agreement either expressly contained in this
Lease or imposed by statute or at common law.

37. SIGNS  No sign, placard, picture, advertisement, name or notice shall be
inscribed, displayed or printed or affixed on or to any part of the outside of
the Premises or any exterior windows of the Premises without the written
consent of Landlord first had and obtained and Landlord shall have the right to
remove any such sign, placard, picture, advertisement, name or notice without
notice to and at the expense of Tenant. If Tenant is allowed to print or affix
or in any way place a sign in, on, or about the Premises, upon expiration or
other sooner termination of this Lease, Tenant at Tenant's sole cost and
expense shall both remove such sign and repair all damage in such a manner as
to restore all aspects of the appearance of the Premises to the condition
prior to the placement of said sign.

        All approved signs or lettering on outside doors shall be printed,
painted, affixed or inscribed at the expense of Tenant by a person approved of
by Landlord.

        Tenant shall not place anything or allow anything to be placed near the
glass of any window, door partition or wall which may appear unsightly from
outside the Premises.

38. MISCELLANEOUS AND GENERAL PROVISIONS

        A. Use of Building Name. Tenant shall not, without the written consent
of Landlord, use the name of the building for any purpose other than as the
address of the business conducted by Tenant in the Premises.
<PAGE>   8
        B.  Choice of Law; Severability.  This Lease shall in all respects be
governed by and construed in accordance with the laws of the State of
California. If any provision of this Lease shall be invalid, unenforceable or
ineffective for any reason whatsoever, all other provisions hereof shall be and
remain in full force and effect.

        C.  Definition of Terms.  The term "Premises" includes the space leased
hereby and any improvements now or hereafter installed therein or attached
thereto. The term "Landlord" or any pronoun used in place thereof includes the
plural as well as the singular and the successors and assigns of Landlord. The
term "Tenant" or any pronoun used in place thereof includes the plural as well
as the singular and individuals, firms, associations, partnerships and
corporations, and their and each of their respective heirs, executors,
administrators, successors and permitted assigns, according to the context
hereof, and the provisions of this Lease shall inure to the benefit of and bind
such heirs, executors, administrators, successors and permitted assigns.
        The term "person" includes the plural as well as the singular and
individuals, firms, associations, partnerships and corporations. Words used in
any gender include other genders. If there be more than one Tenant the
obligations of Tenant hereunder are joint and several. The paragraph headings
of this Lease are for convenience of reference only and shall have no effect
upon the construction or interpretation of any provision hereof.

        D.  Time of Essence.  Time is of the essence of this Lease and of each
and all of its provisions.

        E.  Quitclaim.  At the expiration or earlier termination of this Lease,
Tenant shall execute, acknowledge and deliver to Landlord, within ten (10) days
after written demand from Landlord to Tenant, any quitclaim deed or other
document required by any reputable title company, licensed to operate in the
State of California, to remove the cloud or encumbrance created by this Lease
from the real property of which Tenant's Premises are a part.

        F.  Incorporation of Prior Agreements; Amendments. This instrument
along with any exhibits and attachments hereto constitutes the entire agreement
between Landlord and Tenant relative to the Premises and this agreement and the
exhibits and attachments may be altered, amended or revoked only by an
instrument in writing signed by both Landlord and Tenant. Landlord and Tenant
agree hereby that all prior or contemporaneous oral agreements between and
among themselves and their agents or representatives relative to the leasing of
the Premises are merged in or revoked by this agreement.

        G.  Recording.  Neither Landlord nor Tenant shall record this Lease or
a short form memorandum hereof without the consent of the other.

        H.  Amendments for Financing.  Tenant further agrees to execute any
amendments required by a lender to enable Landlord to obtain financing, so long
as Tenant's rights hereunder are not substantially affected.

        I.  Additional Paragraphs.  Paragraphs 39 through 50 are added hereto
and are included as a part of this lease.

        J.  Clauses, Plats and Riders.  Clauses, plats and riders, if any,
signed by Landlord and Tenant and endorsed on or affixed to this Lease are a
part hereof.

        K.  Diminution of Light, Air or View.  Tenant covenants and agrees that
no diminution or shutting off of light, air or view by any structure which may
be hereafter erected (whether or not by Landlord) shall in any way affect his
Lease, entitle Tenant to any reduction of rent hereunder or result in any
liability of Landlord to Tenant.

        IN WITNESS WHEREOF, Landlord and Tenant have executed and delivered
this Lease as of the day and year last written below.

<TABLE>
<CAPTION>
<S>                                                     <C>

LANDLORD:                                               TENANT:

ARRILLAGA FAMILY TRUST                                  PROTEIN DESIGN LABS, INC.,
                                                        a Delaware corporation

By   [SIGNATURE]                                        By    [SIGNATURE]
   --------------------------                              -------------------------
    John Arrillaga, Trustee

                                                        Title   Vice President and Chief
Date:    3/27/97                                                Financial Officer
      -----------------------                                 ----------------------

RICHARD T. PEERY SEPARATE PROPERTY TRUST
                                                        Type or Print Name      FRED KURLAND
                                                                            ------------------
By    [SIGNATURE]                                       Date:   March 20, 1997
   --------------------------                                 --------------------------------
    Richard T. Peery, Trustee

Date:
       ----------------------

</TABLE>



                                                                  Initials:_____

                                                                  Initials:_____

                                  Page 8 of 8
<PAGE>   9
Paragraphs 39 through 50 to Lease Agreement dated February 20, 1997, By and
Between the Arrillaga Family Trust and the Richard T. Peery Separate Property
Trust, as Landlord, and PROTEIN DESIGN LABS, INC., a Delaware corporation, as
Tenant for 6,688+ Square Feet of Space Located at 552 Del Rey Avenue, Sunnyvale,
California.



39.        BASIC RENT:  In accordance with Paragraph 4A herein, the total
aggregate sum of SEVEN HUNDRED TWENTY THOUSAND NINE HUNDRED ONE AND 68/100
DOLLARS ($720,901.68), shall be payable as follows:

           On March 15, 1997, the sum of TEN THOUSAND SIX HUNDRED THIRTY SIX AND
08/100 DOLLARS ($10,636.08) shall be due, representing the Rental for the period
March 15, 1997 through March 31, 1997.

           On April 1, 1997, the sum of NINETEEN THOUSAND THREE HUNDRED NINETY
FIVE AND 20/100 DOLLARS ($19,395.20) shall be due, and a like sum due on the
first day of each month thereafter, through and including March 1, 1998.

           On April 1, 1998, the sum of NINETEEN THOUSAND SEVEN HUNDRED TWENTY
NINE AND 60/100 DOLLARS ($19,729.60) shall be due, and a like sum due on the
first day of each month thereafter, through and including March 1, 1999.

           On April 1, 1999, the sum of TWENTY THOUSAND SIXTY FOUR AND NO/100
DOLLARS ($20,064.00) shall be due, and a like sum due on the first day of each
month thereafter, through and including March 1, 2000; or until the entire
aggregate sum of SEVEN HUNDRED TWENTY THOUSAND NINE HUNDRED ONE AND 68/100
DOLLARS ($720,901.68) has been paid.


40.        "AS-IS" BASIS: It is hereby agreed that the Premises leased hereunder
is leased strictly on an "as-is" basis and in its present condition, and in the
configuration as shown on Exhibit B attached hereto, and by reference made a
part hereof. It is specifically agreed between the parties that Landlord shall
not be required to make, nor be responsible for any cost, in connection with any
repair, restoration, and/or improvement to the Premises in order for this Lease
to commence, or thereafter, throughout the Term of this Lease. Notwithstanding
anything to the contrary within this Lease, Landlord makes no warranty or
representation of any kind or nature whatsoever as to the condition or repair of
the Premises, nor as to the use or occupancy which may be made thereof.


41.        CONSENT:  Whenever the consent of one party to the other is required
hereunder, such consent shall not be unreasonably withheld.


42.        AUTHORITY TO EXECUTE. The parties executing this Lease Agreement
hereby warrant and represent that they are properly authorized to execute this
Lease Agreement and bind the parties on behalf of whom they execute this Lease
Agreement and to all of the terms, covenants and conditions of this Lease
Agreement as they relate to the respective parties hereto.


43.        RULES AND REGULATIONS AND COMMON AREA: Subject to the terms and
conditions of this Lease and such Rules and Regulations as Landlord may from
time to time prescribe, Tenant and Tenant's employees, invitees and customers
shall, in common with other occupants of the Parcel/Building in which the
premises are located, and their respective employees, invitees and customers,
and others entitled to the use thereof, have the non-exclusive right to use the
access roads, parking areas, and facilities provided and designated by Landlord
for the general use and convenience of the occupants of the Parcel/Building in
which the Premises are located, which areas and facilities are referred to
herein as "Common Area". This right shall terminate upon the termination of this
Lease. Landlord reserves the right from time to time to make changes in the
shape, size, location, amount and extent of Common Area. Landlord further
reserves the right to promulgate such reasonable rules and regulations relating
to the use of the Common Area, and any part or parts thereof, as Landlord may
deem appropriate for the best interests of the occupants of the Parcel/Building.
Such Rules and Regulations may be amended by Landlord from time to time, with or
without advance notice, and all amendments shall be effective upon delivery of a
copy to Tenant. Landlord shall not be responsible to Tenant for the
non-performance by any other tenant or occupant of the Parcel/Building of any of
said Rules and Regulations.



                                     Page 9       Initial :
<PAGE>   10
Landlord shall operate, manage and maintain the Common Area. The manner in which
the Common Area shall be maintained and the expenditures for such maintenance
shall be at the discretion of Landlord.


44.        EXPENSES OF OPERATION, MANAGEMENT, AND MAINTENANCE OF THE COMMON
AREAS OF THE PARCEL AND BUILDING IN WHICH THE PREMISES ARE LOCATED: As
Additional Rent and in accordance with Paragraph 4D of this Lease, Tenant shall
pay to Landlord Tenant's proportionate share (calculated on a square footage or
other equitable basis as calculated by landlord) of all expenses of operation,
management, maintenance and repair of the Common Areas of the Parcel including,
but not limited to, license, permit, and inspection fees; security; utility
charges associated with exterior landscaping and lighting (including water and
sewer charges); all charges incurred in the maintenance and replacement of
landscaped areas, lakes, parking lots, sidewalks, driveways, maintenance, repair
and replacement of all fixtures and electrical, mechanical and plumbing systems;
supplies, materials, equipment and tools; the cost of capital expenditures which
have the effect of reducing operating expenses, provided, however, that in the
event Landlord makes such capital improvements, Landlord may amortize its
investment in said improvements (together with interest at the rate of fifteen
(15%) percent per annum on the unamortized balance) as an operating expense in
accordance with standard accounting practices, provided, that such amortization
is not at a rate greater than the anticipated savings in the operating expenses.

As Additional Rent and in accordance with Paragraph 4D of this Lease, Tenant
shall pay its proportionate share (calculated on a square footage or other
equitable basis as calculated by Landlord) of the cost of operation (including
common utilities), management, maintenance, and repair of the building
(including structural and common areas such as lobbies, restrooms, janitor's
closets, hallways, elevators, mechanical and telephone rooms, stairwells,
entrances, spaces above the ceilings and janitorization of said common areas) in
which the Premises are located. The maintenance items herein referred to
include, but are not limited to, all windows, window frames, plate glass,
glazing, truck doors, main plumbing systems of the building (such as water drain
lines, sinks, toilets, faucets, drains, showers and water fountains), main
electrical systems (such as panels and conduits), heating and airconditioning
systems (such as compressors, fans, air handlers, ducts, boilers, heaters),
structural elements and exterior surfaces of the building; store fronts, roofs,
downspouts, building common area interiors (such as wall coverings, window
coverings, floor coverings and partitioning), ceilings, building exterior doors,
skylights (if any), automatic fire extinguishing systems, and elevators (if
any); license, permit and inspection fees; security, supplies, materials,
equipment and tools; the cost of capital expenditures which have the effect of
reducing operating expenses, provided, however, that in the event Landlord makes
such capital improvements, Landlord may amortize its investment in said
improvements (together with interest at the rate of fifteen (15%) percent per
annum on the unamortized balance) as an operating expense in accordance with
standard accounting practices, provided, that such amortization is not at a rate
greater than the anticipated savings in the operating expenses. Tenant hereby
waives all rights hereunder, and benefits of, subsection 1 of Section 1932 and
Sections 1941 and 1942 of the California Civil Code and under any similar law,
statute or ordinance now or hereafter in effect.

"Additional Rent" as used herein shall not include Landlord's debt repayments;
interest on charges, expenses directly or indirectly incurred by Landlord for
the benefit of any other tenant; cost for the installation of partitioning or
any other tenant improvements; cost of attracting tenants; depreciation;
interest; or executive salaries.


45.        UTILITIES OF THE BUILDING IN WHICH THE PREMISES ARE LOCATED: As
Additional Rent and in accordance with Paragraph 4D of this Lease Tenant shall
pay its proportionate share (calculated on a square footage or other equitable
basis as calculated by Landlord) of the cost of all utility charges such as
water, gas, electricity, (telephone, telex and other electronic communications
service, if applicable) sewer service, waste pick-up and any other utilities,
materials or services furnished directly to the building in which the Premises
are located, including, without limitation, any temporary or permanent utility
surcharge or other exactions whether or not hereinafter imposed.

Landlord shall not be liable for and Tenant shall not be entitled to any
abatement or reduction of rent by reason of any interruption or failure of
utility services to the Premises when such interruption or failure is caused by
accident, breakage, repair, strikes, lockouts, or other labor disturbances or
labor disputes of any nature, or by any other cause, similar or dissimilar,
beyond the reasonable control of Landlord.

Provided that Tenant is not in default in the performance or observance of any
of the terms, covenants or conditions of this Lease to be performed or observed
by it, Landlord shall furnish to the Premises between the hours of 8:00 am and
6:00 pm, Mondays through Fridays (holidays excepted) and subject to the rules
and regulations of the Common Area hereinbefore referred to, reasonable
quantities of water,



                                     Page 10      Initial :
<PAGE>   11
gas and electricity suitable for the intended use of the Premises and heat and
airconditioning required in Landlord's judgment for the comfortable use and
occupation of the Premises for such purposes. Tenant may, from time to time,
have its staff and equipment operate on a twenty-four (24) hour-a-day seven (7)
day-a-week schedule, and Tenant shall pay for any extra utilities used by
Tenant. Landlord acknowledges that Tenant may use electrical current up to 220
volts subject to the terms and conditions of this Paragraph 45. Tenant agrees
that at all times it will cooperate fully with Landlord and abide by all
regulations and requirements that Landlord may prescribe for the proper
functioning and protection of the building heating, ventilating and
airconditioning systems. Whenever heat generating machines, equipment, or any
other devices (including exhaust fans) are used in the Premises by Tenant which
affect the temperature or otherwise maintained by the airconditioning system,
Landlord shall so notify Tenant, and Tenant shall have thirty (30) days in which
to eliminate such use; in the event Tenant does not eliminate such used within
said thirty (30) day period, Landlord shall have the right to install
supplementary airconditioning units in the Premises and the cost thereof,
including the cost of installation and the cost of operation and maintenance
thereof, shall be paid by Tenant to Landlord upon demand by Landlord. Tenant
will not, without the written consent of Landlord, use any apparatus or device
in the Premises (including, without limitation), electronic data processing
machines or machines using current in excess of 110 Volts which will in any way
increase the amount of electricity, gas, water or airconditioning usually
furnished or supplied to premises being used as general office space, or connect
with electric current (except through existing electrical outlets in the
Premises), or with gas or water pipes any apparatus or device for the purposes
of using electric current, gas, or water. If Tenant shall require water, gas, or
electric current in excess of that usually furnished or supplied to premises
being used as general office space, Tenant shall first obtain the written
consent of Landlord, which consent shall not be unreasonably withheld and
Landlord may cause an electric current, gas or water meter to be installed in
the Premises in order to measure the amount of electric current, gas or water
consumed for any such excess use. The cost of any such meter and of the
installation, maintenance and repair thereof, all charges for such excess water,
gas and electric current consumed (as shown by such meters and at the rates then
charged by the furnishing public utility); and any additional expense incurred
by Landlord in keeping account of electric current, gas, or water so consumed
shall be paid by Tenant, and Tenant agrees to pay Landlord therefor promptly
upon demand by Landlord.



46.        PARKING: Tenant shall have the right to the nonexclusive use of
thirty (30) parking spaces in the common parking area of the building. Tenant
agrees that Tenant, Tenant's employees, agents, representatives, and/or invitees
shall not use parking spaces in excess of said thirty parking spaces allocated
to Tenant hereunder. Landlord shall have the right, at Landlord's sole
discretion, to specifically designate the location of Tenant's parking spaces
within the common parking area of the building in the event of a dispute among
the tenants occupying the building referred to herein, in which event Tenant
agrees that Tenant, Tenant's employees, agents, representatives and/or invitees
shall not use any parking spaces other than those parking spaces specifically
designated by Landlord for Tenant's use. Said parking spaces, if specifically
designated by Landlord to Tenant, may be relocated by Landlord at any time, and
from time to time. Landlord reserves the right, at Landlord's sole discretion,
to rescind any specific designation of parking spaces, thereby returning
Tenant's parking spaces to the common parking area. Landlord shall give Tenant
written notice of any change in Tenant's parking spaces. Tenant shall not, at
any time, park, or permit to be parked, any trucks or vehicles adjacent to the
loading area so as to interfere in any way with the use of such areas, nor shall
Tenant, at any time, park or permit the parking of Tenant's trucks and other
vehicles or the trucks and vehicles of Tenant's suppliers or others, in any
portion of the common areas not designated by Landlord for such use by Tenant.
Tenant shall not park nor permit to be parked, any inoperative vehicles or
equipment on any portion of the common parking area or other common areas of the
building. Tenant agrees to assume responsibility for compliance by its employees
with the parking provision contained herein. If Tenant or its employees park in
other than designated parking areas, then Landlord may charge Tenant, as an
additional charge, and Tenant agrees to pay Ten Dollars ($10.00) per day for
each day or partial day each such vehicle is parking in any area other than that
designated. Tenant hereby authorizes Landlord, at Tenant's sole expense, to tow
away from the building any vehicle belonging to Tenant or Tenant's employees
parked in violation of these provisions, or to attach violation stickers or
notices to such vehicles. Tenant shall use the parking area for vehicle parking
only and shall not use the parking areas for storage.


47.        ASSESSMENT CREDITS: The demised property herein may be subject to a
special assessment levied by the City of Sunnyvale as part of an Improvement
District. As a part of said special assessment proceedings (if any), additional
bonds were or may be sold and assessments were or may be levied to provide for
construction contingencies and reserve funds. Interest shall be earned on such
funds created for contingencies and on reserve funds which will be credited for
the benefit of said assessment district. To the extent surpluses are created in
said district through unused contingency funds, interest earnings or reserve
funds, such surpluses shall be deemed the property of Landlord. Notwithstanding
that such



                                     Page 11      Initial :
<PAGE>   12
surpluses may be credited on assessments otherwise due against the Leased
Premises, Tenant shall pay to Landlord, as additional rent if, and at the time
of any such credit of surpluses, an amount equal to all such surpluses so
credited. For example: if (i) the property is subject to an annual assessment of
$1,000.00, and (ii) a surplus of $200.00 is credited towards the current year's
assessment which reduces the assessment amount shown on the property tax bill
from $1,000.00 to $800.00, Tenant shall, upon receipt of notice from Landlord,
pay to Landlord said $200.00 credit as Additional Rent.


48.        ASSIGNMENT AND SUBLETTING (CONTINUED):  Any and all sublease
agreement(s) between Tenant and any and all subtenant(s) (which agreements must
be consented to by Landlord, pursuant to the requirements of this Lease) shall
contain the following language:

                          "If Landlord and Tenant jointly and voluntarily elect,
      for any reason whatsoever, to terminate the Master Lease prior to the
      scheduled Master Lease termination date, then this Sublease (if then still
      in effect) shall terminate concurrently with the termination of the Master
      Lease. Subtenant expressly acknowledges and agrees that (1) the voluntary
      termination of the Master Lease by Landlord and Tenant and the resulting
      termination of this Sublease shall not give Subtenant any right or power
      to make any legal or equitable claim against Landlord, including without
      limitation any claim for interference with contract or interference with
      prospective economic advantage, and (2) Subtenant hereby waives any and
      all rights it may have under law or at equity against Landlord to
      challenge such an early termination of the Sublease, and unconditionally
      releases and relieves Landlord, and its officers, directors, employees and
      agents, from any and all claims, demands, and/or causes of action
      whatsoever (collectively, "Claims"), whether such matters are known or
      unknown, latent or apparent, suspected or unsuspected, foreseeable or
      unforeseeable, which Subtenant may have arising out of or in connection
      with any such early termination of this Sublease. Subtenant knowingly and
      intentionally waives any and all protection which is or may be given by
      Section 1542 of the California Civil Code which provides as follows: "A
      general release does not extend to claims which the creditor does not know
      or suspect to exist in his favor at the time of executing the release,
      which if known by him must have materially affected his settlement with
      debtor.

                The term of this Sublease is therefore subject to early
      termination. Subtenant's initials here below evidence (a) Subtenant's
      consideration of and agreement to this early termination provision, (b)
      Subtenant's acknowledgment that, in determining the net benefits to be
      derived by Subtenant under the terms of this Sublease, Subtenant has
      anticipated the potential for early termination, and (c) Subtenant's
      agreement to the general waiver and release of Claims above.


           Initials:  __________             Initials:__________"
                   Subtenant                     Tenant

49.        HAZARDOUS MATERIALS: Landlord and Tenant agree as follows with
respect to the existence or use of "Hazardous Materials" (as defined herein) on,
in, under or about the Premises and real property located beneath said Premises
and the common areas of the Parcel, which includes the entire parcel of land on
which the Premises are located as shown in Green on Exhibit A attached hereto
(hereinafter collectively referred to as the "Property"):

           A. As used herein, the term "Hazardous Materials" shall mean any
material, waste, chemical, mixture or byproduct which is or hereafter is
defined, listed or designated under Environmental Laws (defined below) as a
pollutant, or as a contaminant, or as a toxic or hazardous substance, waste or
material, or any other unwholesome, hazardous, toxic, biohazardous, or
radioactive material, waste, chemical, mixture or byproduct, or which is listed,
regulated or restricted by any Environmental Law (including, without limitation,
petroleum hydrocarbons or any distillates or derivatives or fractions thereof,
polychlorinated biphenyls, or asbestos). As used herein, the term "Environmental
Laws" shall mean any applicable Federal, State of California or local government
law (including common law), statute, regulation, rule, ordinance, permit,
license, order, requirement, agreement, or approval, or any determination,
judgment, directive, or order of any executive or judicial authority at any
level of Federal, State of California or local government (whether now existing
or subsequently adopted or promulgated) relating to pollution or the protection
of the environment, ecology, natural resources, or public health and safety.

           B. Tenant shall obtain Landlord's written consent, which may be
withheld in Landlord's discretion, prior to the occurrence of any Tenant's
Hazardous Materials Activities (defined below); provided, however, that
Landlord's consent shall not be required for normal use in compliance with



                                     Page 12      Initial :
<PAGE>   13
applicable Environmental Laws of customary household and office supplies (Tenant
shall first provide Landlord with a list of said materials use), such as mild
cleaners, lubricants and copier toner. As used herein, the term "Tenant's
Hazardous Materials Activities" shall mean any and all use, handling,
generation, storage, disposal, treatment, transportation, release, discharge, or
emission of any Hazardous Materials on, in, beneath, to, from, at or about the
Property, in connection with Tenant's use of the Property, or by Tenant or by
any of Tenant's agents, employees, contractors, vendors, invitees, visitors or
its future subtenants or assignees. Tenant agrees that any and all Tenant's
Hazardous Materials Activities shall be conducted in strict, full compliance
with applicable Environmental Laws at Tenant's expense, and shall not result in
any contamination of the Property or the environment. Tenant agrees to provide
Landlord with prompt written notice of any spill or release of Hazardous
Materials at the Property during the term of the Lease of which Tenant becomes
aware, and further agrees to provide Landlord with prompt written notice of any
violation of Environmental Laws in connection with Tenant's Hazardous Materials
Activities of which Tenant becomes aware. If Tenant's Hazardous Materials
Activities involve Hazardous Materials other than normal use of customary
household and office supplies, Tenant also agrees at Tenant's expense: (i) to
install such Hazardous Materials monitoring, storage and containment devices as
Landlord reasonably deems necessary (Landlord shall have no obligation to
evaluate the need for any such installation or to require any such
installation); (ii) provide Landlord with a written inventory of such Hazardous
Materials, including an update of same each year upon the anniversary date of
the Commencement Date of the Lease ("Anniversary Date"); and (iii) on each
Anniversary Date, to retain a qualified environmental consultant, acceptable to
Landlord, to evaluate whether Tenant is in compliance with all applicable
Environmental Laws with respect to Tenant's Hazardous Materials Activities.
Tenant, at its expense, shall submit to Landlord a report from such
environmental consultant which discusses the environmental consultant's findings
within two (2) months of each Anniversary Date. Tenant, at its expense, shall
promptly undertake and complete any and all steps necessary, and in full
compliance with applicable Environmental Laws, to fully correct any and all
problems or deficiencies identified by the environmental consultant, and
promptly provide Landlord with documentation of all such corrections.

           C. Prior to termination or expiration of the Lease, Tenant, at its
expense, shall (i) properly remove from the Property all Hazardous Materials
which come to be located at the Property in connection with Tenant's Hazardous
Materials Activities, and (ii) fully comply with and complete all facility
closure requirements of applicable Environmental Laws regarding Tenant's
Hazardous Materials Activities, including but not limited to (x) properly
restoring and repairing the Property to the extent damaged by such closure
activities, and (y) obtaining from the local Fire Department or other
appropriate governmental authority with jurisdiction a written concurrence that
closure has been completed in compliance with applicable Environmental Laws.
Tenant shall promptly provide Landlord with copies of any claims, notices, work
plans, data and reports prepared, received or submitted in connection with any
such closure activities.

           D. If Landlord, in its sole discretion, believes that the Property
has become contaminated as a result of Tenant's Hazardous Materials Activities,
Landlord in addition to any other rights it may have under this Lease or under
Environmental Laws or other laws, may enter upon the Property and conduct
inspection, sampling and analysis, including but not limited to obtaining and
analyzing samples of soil and groundwater, for the purpose of determining the
nature and extent of such contamination. Tenant shall promptly reimburse
Landlord for the costs of such an investigation, including but not limited to
reasonable attorneys' fees Landlord incurs with respect to such investigation,
that discloses Hazardous Materials contamination for which Tenant is liable
under this Lease. Except as may be required of Tenant by applicable
Environmental Laws, Tenant shall not perform any sampling, testing, or drilling
to identify the presence of any Hazardous Materials at the Property, without
Landlord's prior written consent which may be withheld in Landlord's discretion.
Tenant shall promptly provide Landlord with copies of any claims, notices, work
plans, data and reports prepared, received or submitted in connection with any
sampling, testing or drilling performed pursuant to the preceding sentence.

           E. Tenant shall indemnify, defend (with legal counsel acceptable to
Landlord, whose consent shall not unreasonably be withheld) and hold harmless
Landlord, its employees, assigns, successors, successors-in-interest, agents and
representatives from and against any and all claims (including but not limited
to third party claims from a private party or a government authority),
liabilities, obligations, losses, causes of action, demands, governmental
proceedings or directives, fines, penalties, expenses, costs (including but not
limited to reasonable attorneys', consultants' and other experts' fees and
costs), and damages, which arise from or relate to: (i) Tenant's Hazardous
Materials Activities; (ii) any Hazardous Materials contamination caused by
Tenant prior to the Commencement Date of the Lease (but not for any Hazardous
Materials contamination caused by other third parties prior to the Commencement
Date of the Lease); or (iii) the breach of any obligation of Tenant under this
Paragraph 49 (collectively, "Tenant's Environmental Indemnification"). Tenant's
Environmental Indemnification shall include but is not limited to the obligation
to promptly and fully reimburse Landlord for losses in or reductions to rental
income, and diminution in fair market value of the Property. Tenant's
Environmental



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Indemnification shall further include but is not limited to the obligation to
diligently and properly implement to completion, at Tenant's expense, any and
all environmental investigation, removal, remediation, monitoring, reporting,
closure activities, or other environmental response action (collectively,
"Response Actions"). Tenant shall promptly provide Landlord with copies of any
claims, notices, work plans, data and reports prepared, received or submitted in
connection with any Response Actions.

It is agreed that the Tenant's responsibilities related to Hazardous Materials
will survive the expiration or termination of this Lease and that Landlord may
obtain specific performance of Tenant's responsibilities under this Paragraph
49.


50.        PUNCH LIST: In addition to and notwithstanding anything to the
contrary in Paragraphs 5 ("Acceptance and Surrender of Premises") and 40
("'As-Is' Basis") of this Lease, Tenant shall have thirty (30) days after the
Commencement Date to provide Landlord with a written "punch list" pertaining to
defects in the interior improvements. As soon as reasonably possible thereafter,
Landlord, or one of Landlord's representatives (if so approved by Landlord), and
Tenant shall conduct a joint walk-through of the Premises (if Landlord so
requires), and inspect such interior improvements, using their best efforts to
agree on the incomplete or defective construction related to the interior
improvements installed by Landlord. After such inspection has been completed,
Landlord shall prepare, and both parties shall sign, a list of all "punch list"
items which the parties reasonably agree are to be corrected by Landlord (but
which shall exclude any damage or defects caused by Tenant, its employees,
agents or parties Tenant has contracted with to work on the Premises). Landlord
shall have thirty (30) days thereafter (or longer if necessary, provided
Landlord is diligently pursuing the completion of the same) to complete, at
Landlord's expense, the "punch list" items without the Commencement Date of the
Lease and Tenant's obligation to pay Rental thereunder being affected.
Notwithstanding the foregoing, a crack in the foundation, or exterior walls or
any other defect that does not endanger the structural integrity of the
building, or which is not life-threatening, shall not be considered material,
nor shall Landlord be responsible for repair of same. This Paragraph shall be of
no force and effect if Tenant shall fail to give any such notice to Landlord
within thirty (30) days after the Commencement Date of this Lease.


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             [EXHIBIT A TO LEASE AGREEMENT DATED FEBRUARY 20, 1997]



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             [EXHIBIT B TO LEASE AGREEMENT DATED FEBRUARY 20, 1997]



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