Document:

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                                                                   EXHIBIT 10.27

                                 LEASE AGREEMENT

                                 by and between

                           CARIBBEAN/GENEVA INVESTORS
                           AND CROSSMAN PARTNERS, L.P.

                                  ("LANDLORD")

                                       and

                                 HARMONIC, INC.

                                   ("TENANT")

                            DATED AS OF MAY 24, 2000

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                                    EXHIBITS

Exhibit "A"    Premises

Exhibit "B"    Land

Exhibit "C"    Declaration of Covenants, Conditions and Restrictions

Exhibit "D"    Rules and Regulations

Exhibit "E"    Form of Tenant Estoppel Certificate

Exhibit "F"    Subordination, Nondisturbance and Attornment Agreement

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                             BASIC LEASE INFORMATION

Lease Date:                      May 24, 2000

Landlord:                        Caribbean/Geneva Investors, a California
                                 limited partnership, and Crossman Partners,
                                 L.P., a California limited partnership, Tenants
                                 In Common

Managing Agent:                  The Mozart Development Company

Landlord's and Managing
Agent's Address:                 c/o The Mozart Development Company
                                 1068 East Meadow Circle
                                 Palo Alto, CA 94303
                                 Attn: James Freitas & John Mozart

Tenant:                          Harmonic, Inc., a Delaware corporation

TENANT'S ADDRESS:                FOR NOTICE                FOR BILLING
                                 549 Baltic Way            549 Baltic Way
                                 Sunnyvale, CA 94089       Sunnyvale, CA 94089
                                 Attn: Robin Dickson,      Attn: Robin Dickson,
                                       Chief Financial           Chief Financial
                                       Officer                   Officer

Building:                        The building located at 1322 Crossman Avenue,
                                 Sunnyvale, California

Premises:                        The entire Building as depicted on Exhibit "A"

Land:                            The Real Property described on Exhibit "B"

Rentable Area of the Premises:   52,325 rentable square feet ("Rentable Area")

Parking Spaces:                  All parking spaces located on the Land

Tenant's Use of the Premises:    General office, research, development,
                                 manufacturing, storage and distribution,
                                 production, marketing and distribution

Lease Term:                      Ten (10) years (the "Initial Term"), with the
                                 right to extend for two (2) additional five (5)
                                 year terms (each an "Extension Term") in
                                 accordance with Paragraph 42. The Initial Term,
                                 and any Extension Term(s) shall collectively be
                                 defined as the "Term"

Estimated Availability Date:     September 1, 2000

Monthly Base Rent:               $3.25 per rentable square foot of the Rentable
                                 Area of the Premises.

Monthly Base Rent
Adjustment:                      On each anniversary of the Commencement Date,
                                 the Monthly Base Rent shall increase by four
                                 percent (4%) of the Monthly Base Rent for the
                                 immediately prior year

Tenant's Share of
Expenses and Taxes:              100%

Security Deposit:                $193,600

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Guarantor of Lease:              None

Landlord's Broker:               None

Tenant's Broker:                 Cornish & Carey

Broker's Fee or Commission,
if any, paid by:                 Landlord, pursuant to separate agreement

The foregoing Basic Lease Information is hereby incorporated into and made a
part of this Lease. Each reference in this Lease to any of the Basic Lease
Information shall mean the respective information hereinabove set forth and
shall be construed to incorporate all of the terms provided under the particular
paragraph pertaining to such information. In the event of any conflict between
any Basic Lease Information and the Lease, the latter shall control.

                                   LANDLORD:

                                   CARIBBEAN/GENEVA INVESTORS
                                   a California Limited Partnership

                                   By: /s/ JOHN MOZART
                                      ------------------------------------------
                                      John Mozart, Trustee of the Mozart
                                      Family Trust dated September 8, 1977
                                      Its:  General Partner

                                   By: /s/ JOHN LOVEWELL
                                      ------------------------------------------
                                      John Lovewell
                                      Its: General Partner

                                   CROSSMAN PARTNERS, L.P.,
                                   a California Limited Partnership

                                   By: /s/ JOHN MOZART
                                      ------------------------------------------
                                      John Mozart, Trustee of the Mozart
                                      Family Trust dated September 8, 1977
                                      Its: General Partner

                                   TENANT:

                                   HARMONIC, INC.,
                                   a Delaware corporation

                                   By: /s/ ANTHONY J. LEY
                                      ------------------------------------------
                                      ANTHONY J. LEY
                                      ------------------------------------------
                                      Its: PRESIDENT
                                          --------------------------------------

                                   By: /s/ ROBIN N. DICKSON
                                      ------------------------------------------
                                      ROBIN N. DICKSON
                                      ------------------------------------------
                                      Its: CHIEF FINANCIAL OFFICER
                                          --------------------------------------

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                                 LEASE AGREEMENT

        THIS LEASE AGREEMENT (the "Lease") is made and entered into as of May
24, 2000, by and between CARIBBEAN/GENEVA INVESTORS, a California Limited
Partnership and CROSSMAN PARTNERS, L.P., a California Limited Partnership, as
Tenants in Common (herein collectively called "Landlord"), and HARMONIC, INC., a
Delaware corporation (herein called "Tenant").

        Upon and subject to the terms, covenants and conditions hereinafter set
forth, Landlord hereby leases to Tenant and Tenant hereby hires from Landlord
those premises (the "Premises") outlined on EXHIBIT A, comprising the entire
rentable area in the Building located at 1322 Crossman Avenue in Sunnyvale,
California (hereinafter referred to as the "Building") specified in the Basic
Lease Information attached hereto. Prior to the execution of this Lease, Tenant
has reviewed and approved the Rentable Area specified in the Basic Lease
Information, which shall be conclusive and binding on the parties for purposes
of calculating Rent and the Tenant Allowance hereunder notwithstanding any
measurement or remeasurement by Landlord, Tenant or any other party that may now
or hereafter indicate a different Rentable Area. The Building, together with the
associated land specified in the Basic Lease Information and improvements is
referred to as the "Project." The term "Common Area" shall mean all areas and
facilities within the Project that are not designated by Landlord for the
exclusive use of Tenant or any other tenant or other occupant of the Project
that are located outside the perimeter (including footings) of the Building,
including the parking areas, access and perimeter roads, pedestrian sidewalks,
landscaped areas, trash enclosures, recreation areas and the like.

        1. OCCUPANCY AND USE. Tenant may use and occupy the Premises for the
purposes specified in the Basic Lease Information ("Permitted Use"), subject to
the terms and conditions of this Lease, and for no other use or purpose without
the prior written consent of Landlord. Landlord shall have the right to grant or
withhold consent to a use other than as specified in the Basic Lease Information
in its sole discretion. Tenant shall be entitled to the nonexclusive use of the
Common Area with Landlord and other occupants (if any) of the Project in
accordance with the Rules and Regulations established by Landlord from time to
time. Notwithstanding anything to the contrary in the Basic Lease Information or
in this Lease, Tenant understands and agrees that the Declaration of Covenants,
Conditions and Restrictions ("CC&Rs") described in EXHIBIT C encumbers the
Project and that Tenant's Occupancy and Use of the Premises are restricted by,
and Tenant shall fully comply with any and all restrictions on the use of the
Premises specified in, such CC&Rs.

        2. TERM AND POSSESSION.

               (a) The term of this Lease (the "Term") shall be for the period
specified in the Basic Lease Information (or until sooner terminated as herein
provided), commencing on the Commencement Date and expiring on the Expiration
Date. The "Commencement Date" shall be the earlier to occur of (i) thirty (30)
days after the date on which Landlord gives Tenant written notice that the
Premises is available for Tenant's occupancy, or (ii) any earlier date upon
which Tenant actually occupies and conducts business in any portion of the
Premises. Within five (5) business days after the Commencement Date, the parties
shall execute a letter confirming the Commencement Date and certifying that
Tenant has accepted delivery of the Premises (the "Commencement Date
Memorandum"). Either party's failure to request execution of, or to execute, the
Commencement Date Memorandum shall not in any way alter the Commencement Date.
By occupying the Premises, Tenant shall be deemed to have accepted the same as
suitable for the purpose herein intended. The "Expiration Date" shall be the
date that is one day prior to the tenth anniversary of the Commencement Date
(subject to extension in accordance with Paragraph 42 to the date that is one
day prior to the fifth anniversary of any exercised Extension Term).

               (b) Tenant is aware that the Premises is currently occupied by
another tenant ("Existing Tenant"). Pursuant to a written agreement between
Landlord and the Existing Tenant, the Existing Tenant has agreed to vacate the
Premises on or before the Estimated Availability Date set forth in the Basic
lease Information. If Landlord, for any reason whatsoever (including without
limitation the failure of the Existing Tenant to surrender possession of the
Premises on or before the Estimated Availability Date), cannot deliver
possession of the Premises to Tenant by the Estimated Commencement Date, this
Lease shall not be void or voidable, nor shall Landlord be

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liable to Tenant for any loss or damage resulting therefrom. In that event,
however, the Term of the Lease shall not commence until such commencement date
as is determined pursuant to Paragraph 2(a). In such event, the Commencement
Date and the Expiration Date shall be adjusted accordingly.

               (c) The Premises shall be delivered by Landlord to Tenant in its
"as-is, where-is condition, with all faults", but in "broom clean" condition.
Tenant acknowledges that Landlord has not made any representation or warranty,
express or implied, with respect to the condition of the Premises, the
suitability or fitness of the Premises for the conduct of Tenant's Permitted
Uses or for any other purposes, or the actual dimensions of the Premises. Tenant
represents and warrants that Tenant has conducted a thorough and diligent
inspection and investigation, either independently or through agents of Tenant's
own choosing, of the Premises and the suitability of the Premises for Tenant's
intended use, that Tenant is fully aware of the needs of its operations and has
determined, based solely on its own investigation, that the Premises are
suitable for its operations and intended use. In no event shall Landlord be
liable for any defect in the Premises or for any limitations on the use of the
Premises, except as expressly and specifically set forth in this Lease.

        3. RENT; RENT ADJUSTMENTS; ADDITIONAL CHARGES FOR EXPENSES AND TAXES.

               (a) MONTHLY BASE RENT AND ADDITIONAL CHARGES. Commencing on the
Commencement Date and throughout the Term of this Lease, Tenant shall the
monthly base rent specified in the Basic Lease Information, as adjusted pursuant
to Paragraph 3(b) (as so adjusted from time to time, "Monthly Base Rent"), on
the first day of each month, in advance, with the first month's Monthly Base
Rent and Additional Charges for Expenses and Taxes (as defined below) due upon
execution of this Lease, in lawful money of the United States (without any prior
demand therefor and without deduction or offset whatsoever, except as expressly
provided in Paragraphs 20 and 21) to Landlord or its Managing Agent at the
address specified in the Basic Lease Information or to such other firm or to
such other place as Landlord or its Managing Agent may from time to time
designate in writing. In addition, Tenant shall pay to Landlord all charges and
other amounts whatsoever as provided in this Lease ("Additional Charges") at the
place where the Monthly Base Rent is payable, and Landlord shall have the same
remedies for a Default in the payment of Additional Charges as for a Default in
the payment of Monthly Base Rent. As used herein, the term "Rent" shall include
all Monthly Base Rent and Additional Charges (including, without limitation,
Additional Charges for Real Estate Taxes and Expenses pursuant to Paragraph 3(c)
below, and Additional Charges pursuant to Paragraphs 6, 7(e), 8, 10(d) and 23).
If the Commencement Date occurs on a day other than the first day of a calendar
month, or the Expiration Date occurs on a day other than the last day of a
calendar month, then the Monthly Base Rent and Additional Charges for such
fractional month shall be prorated on a daily basis.

               (b) ANNUAL ADJUSTMENTS IN MONTHLY BASE RENT. The Monthly Base
Rent under Paragraph 3(a) shall be adjusted throughout the Term (including any
Extension Term(s)) as provided in the Basic Lease Information under the heading
"Monthly Base Rent Adjustment".

               (c) ADDITIONAL CHARGES FOR EXPENSES AND TAXES.

                      (i) DEFINITIONS OF ADDITIONAL CHARGES. For purposes of
        this Paragraph 3(c), the following terms shall have the meanings
        hereinafter set forth:

                             (A) "TAX YEAR" shall mean each twelve (12)
               consecutive month period commencing January 1st of the calendar
               year during which the Commencement Date of this Lease occurs,
               provided that Landlord, upon notice to Tenant, may change the Tax
               Year from time to time to any other twelve (12) consecutive month
               period and, in the event of any such change, Tenant's Share of
               Real Estate Taxes (as hereinafter defined) shall be equitably
               adjusted for the Tax Years involved in any such change.

                             (B) "TENANT'S SHARE" shall mean the percentage
               figure so specified in the Basic Lease Information.

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                             (C) "REAL ESTATE TAXES" shall mean all taxes,
               assessments and charges levied upon or with respect to the
               Project or any personal property of Landlord used in the
               operation thereof, or Landlord's interest in the Project or such
               personal property. Real Estate Taxes shall include, without
               limitation, all general real property taxes and general and
               special assessments, charges, fees or assessments for transit,
               housing, police, fire or other governmental services or purported
               benefits to the Project (provided, however, that any refunds of
               Real Estate Taxes paid by Tenant shall be credited against
               Tenant's further obligation to pay Real Estate Taxes during the
               Term or refunded to Tenant if received by Landlord within one
               year after the Expiration Date), service payments in lieu of
               taxes, and any tax, fee or excise on the act of entering into
               this Lease, or any other lease of space in the Building, or on
               the use or occupancy of the Building or any part thereof, or on
               the rent payable under any lease or in connection with the
               business of renting space in the Building, that are now or
               hereafter levied or assessed against Landlord by the United
               States of America, the State of California, or any political
               subdivision, public corporation, district or any other political
               or public entity, and shall also include any other tax, fee or
               other excise, however described, that may be levied or assessed
               as a substitute for, or as an addition to, in whole or in part,
               any other Real Estate Taxes, whether or not now customary or in
               the contemplation of the parties on the date of this Lease. Real
               Estate Taxes shall not include franchise, transfer, inheritance
               or capital stock taxes or income taxes measured by the net income
               of Landlord from all sources unless, due to a change in the
               method of taxation, any of such taxes is levied or assessed
               against Landlord as a substitute for, in whole or in part, any
               other tax that would otherwise constitute a Real Estate Tax.
               Additionally, Real Estate Taxes shall not include any assessments
               or like charges to pay for any remediation of contamination from
               any Hazardous Substance (defined in Paragraph 40 hereof) existing
               at the Project as of the Commencement Date unless introduced in,
               on, under or about the Premises by Tenant or Tenant's employees,
               agents, contractors or invitees. Real Estate Taxes shall also
               include reasonable legal fees, costs and disbursements incurred
               in connection with proceedings to contest, determine or reduce
               Real Estate Taxes; provided that such fees, costs and
               disbursements do not exceed the actual savings in Real Estate
               Taxes obtained by Tenant over the Term of the Lease. If any
               assessments are levied on the Project, Tenant shall have no
               obligation to pay more than that amount of annual installments of
               principal and interest that would become due during the Term had
               Landlord elected to pay the assessment in installment payments,
               even if Landlord pays the assessment in full.

                             (D) "EXPENSES" shall mean the total costs and
               expenses paid or incurred by Landlord in connection with the
               management, operation, maintenance and repair of the Project,
               including, without limitation (i) the cost of air conditioning,
               electricity, steam, heating, mechanical, ventilating, elevator
               systems and all other utilities, to the extent provided by
               Landlord, and the cost of supplies and equipment and maintenance
               and service contracts in connection therewith; (ii) the cost of
               repairs and general maintenance and cleaning; (iii) the cost of
               fire, extended coverage, boiler, sprinkler, public liability,
               property damage, rent, earthquake (if Landlord elects to obtain
               it) and other insurance for the Project obtained by Landlord, or
               otherwise obtained by Landlord in connection with the Project,
               all including, without limitation, insurance premiums and any
               deductible amounts paid by Landlord, including, without
               limitation, the insurance required by Paragraph 10(f); (iv) fees,
               charges and other costs directly related to the operation of the
               Project (as distinct from the operation of the partnership which
               owns the Project), including management fees, consulting fees,
               legal fees and accounting fees, fees of all independent
               contractors engaged by Landlord directly related to the operation
               of the Project or reasonably charged by Landlord if Landlord
               performs management services in connection with the Project,
               (though the management fee shall not exceed the cap noted in the
               following paragraph); (v) the cost of any capital improvements
               made to the Project after the Commencement Date (excluding,
               however, any capital improvements required by Laws that are
               Tenant's responsibility under Paragraph 5, which shall be paid
               directly by Tenant pursuant to Paragraph 5), the cost of such
               capital improvements incurred by Landlord shall be amortized over
               the useful life of the capital item in question as determined in
               accordance with generally accepted accounting principles
               ("GAAP"), together with interest on the unamortized balance at
               the greater of (x) the rate paid

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               by Landlord on funds borrowed from an institutional lender for
               the purpose of constructing such capital improvements; or (y) 10%
               per annum; provided, however, the amount of the cost of capital
               improvements which may be included within Expenses pursuant to
               this clause (v) shall be the greater of (I) the amount that would
               be payable pursuant to the foregoing amortization or (11) $.02
               per square foot of the Rentable Area of the Premises per month
               (and to the extent the amount under this clause (II) exceeds the
               amount that would be payable under clause (I), such excess shall
               be credited against the unamortized balance of the cost of
               capital improvements in the inverse order in which they would be
               payable by Tenant under clause (i)); and (vi) any other
               reasonable expenses of any other kind whatsoever reasonably
               incurred in managing, operating, maintaining and repairing the
               Project. Any "deductible" amounts relating to capital
               improvements required to be paid by Tenant hereunder in
               connection with any property or earthquake insurance policy
               carried by Landlord shall be amortized over the useful life of
               the restoration work to which such deductible amount relates in
               accordance with GAAP, in the same manner as other capital
               improvements that are included in Expenses as provided above.

               Notwithstanding anything to the contrary herein contained,
               Expenses shall not include, and in no event shall Tenant have any
               obligation to pay for pursuant to this Paragraph 3 or Paragraph
               7(a)7(b), (aa) any rent payable pursuant to a ground lease, and
               debt service (including, but without limitation, interest,
               principal and any impound payments) required to be made on any
               mortgage or deed of trust recorded with respect to all or any
               portion of the Project other than debt service and financing
               charges imposed pursuant to Paragraph 3(c)(i)(D)(v) above; (bb)
               depreciation; (cc) the portion of a management fee paid to
               Landlord or affiliate in excess of three percent (3%) of Monthly
               Base Rent and Additional Charges for Expenses and Taxes
               (excluding the management fee); (dd) costs occasioned by the
               fraud or willful misconduct under applicable laws of Landlord or
               its agents, servants, contractors, employees; (ee) costs for
               which Landlord has a right of and has received reimbursement from
               others; (ff) environmental pollution remediation related costs
               for which Landlord has indemnified Tenant pursuant to Paragraph
               40(c); (gg) advertising or promotional expenditures; and (hh)
               leasing commissions. All costs and expenses shall be determined
               in accordance with GAAP which shall be consistently applied (with
               accruals appropriate to Landlord's business).

                             (E) "EXPENSE YEAR" shall mean each twelve (12)
               consecutive month period commencing January I of the calendar
               year during which the Commencement Date of the Lease occurs,
               provided that Landlord, upon notice to Tenant, may change the
               Expense Year from time to time to any other twelve (12)
               consecutive month period, and, in the event of any such change,
               Tenant's Share of Expenses shall be equitably adjusted for the
               Expense Years involved in any such change.

                      (ii) PAYMENT OF REAL ESTATE TAXES. With reasonable
        promptness after Landlord has received the tax bills for any Tax Year,
        Landlord shall furnish Tenant with a statement (herein called
        "Landlord's Tax Statement") setting forth the amount of Real Estate
        Taxes for such Tax Year. Unless otherwise required pursuant to Paragraph
        3(c)(v) below, Tenant shall pay to Landlord the full amount of said
        actual Real Estate Taxes no later than twenty (20) days prior to the due
        date of each installment of Real Estate Taxes. Notwithstanding the
        foregoing, Landlord shall have the right, upon the giving of written
        notice to Tenant, to require Tenant to pay the estimated amount of Real
        Estate Taxes; and if Landlord gives such notice, Tenant shall,
        commencing with the next succeeding calendar month, pay to Landlord as
        Additional Charges one-twelfth (1/12th) of the Real Estate Taxes for
        each Tax Year on or before the first day of each month during such Tax
        Year, in advance, in an amount reasonably estimated by Landlord and
        billed by Landlord to Tenant. Landlord shall have the right initially to
        determine monthly estimates and to revise such estimates from time to
        time. If the actual Real Estate Taxes for such Tax Year (as shown on
        Landlord's Tax Statement) exceed the estimated Real Estate Taxes paid by
        Tenant for such Tax Year, Tenant shall pay to Landlord the difference
        between the amount paid by Tenant and the actual Real Estate Taxes
        within fifteen (15) days after the receipt of Landlord's Tax Statement,
        and if the total amount paid by Tenant for any such Tax Year shall
        exceed the actual Real Estate Taxes for such Tax Year, such excess

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        shall be credited against the next installment of Real Estate Taxes due
        from Tenant to Landlord hereunder or if the Term has ended it shall be
        returned to Tenant within thirty (30) days. If it has been determined
        that Tenant has overpaid Real Estate Taxes during the last year of the
        Lease Term, then Landlord shall reimburse Tenant for such overage on or
        before the thirtieth (30th) day following the Expiration Date. No delay
        by Landlord in providing Landlord's Tax Statement shall be deemed a
        default by Landlord or a waiver of Landlord's right to require payment
        of the actual or estimated sums of Real Estate Taxes.

                      (iii) PAYMENT OF INSURANCE COSTS. With reasonable
        promptness after Landlord has received an invoice for any fire, extended
        coverage, boiler, sprinkler, public liability, property damage, rent,
        earthquake (if Landlord elects to obtain it) and other insurance for the
        Project obtained by Landlord, or otherwise obtained by Landlord in
        connection with the Project, including, without limitation, the
        insurance required by Paragraph 10(f), Landlord shall furnish Tenant
        with a statement (herein called "Landlord's Insurance Statement")
        setting forth the amount of the premium for such insurance. Unless
        otherwise required pursuant to Paragraph 3(c)(v) below, Tenant shall pay
        to Landlord the full amount of said insurance premium no later than
        twenty (20) days prior to the due date of such insurance premium.
        Notwithstanding the foregoing, Landlord shall have the right, upon the
        giving of written notice to Tenant, to require Tenant to pay the
        estimated amount of Landlord's cost of insurance in monthly installments
        in accordance with the provisions of Paragraph 3(c)(iv) below.

                      (iv) PAYMENT OF EXPENSES. Commencing on the Commencement
        Date, Tenant shall pay to Landlord as Additional Charges one-twelfth
        (1/12th) of the Expenses (including insurance premiums if Landlord has
        made the election described in the last sentence of Paragraph 3(c)(iii)
        above) for each Expense Year on or before the first day of each month of
        such Expense Year, in advance, in an amount reasonably estimated by
        Landlord and billed by Landlord to Tenant, and Landlord shall have the
        right initially to determine monthly estimates and to revise such
        estimates from time to time. With reasonable promptness after the
        expiration of each Expense Year, Landlord shall furnish Tenant with a
        statement (herein called "Landlord's Expense Statement"), setting forth
        in reasonable detail the Expenses for such Expense Year. If the actual
        Expenses for such Expense Year exceed the estimated Expenses paid by
        Tenant for such Expense Year, Tenant shall pay to Landlord the
        difference between the amount paid by Tenant and the actual Expenses
        within fifteen (15) days after the receipt of Landlord's Expense
        Statement, and if the total amount paid by Tenant for any such Expense
        Year shall exceed the actual Expenses for such Expense Year, such excess
        shall be credited against the next installment of the estimated Expenses
        due from Tenant to Landlord hereunder or if the Term has ended it shall
        be returned to Tenant within thirty (30) days. Any utility rebates for
        the Project which Landlord receives for payments made by Tenant shall be
        forwarded to Tenant so long as such rebate is received within one year
        following the Expiration Date or sooner termination of the Lease. If it
        has been determined that Tenant has overpaid Expenses during the last
        year of the Lease Term (including rebates of utilities applicable to
        Tenant), then Landlord shall reimburse Tenant for such overage on or
        before the thirtieth (30th) day following the Expiration Date.

                      (v) OTHER. To the extent any item of Real Estate Taxes or
        Expenses is payable by Landlord in advance of the period to which it is
        applicable (e.g. insurance and tax escrows required by Landlord's
        Lender), or to the extent that prepayment is customary for the service
        or matter, Landlord may (i) include such items in Landlord's estimate
        for periods prior to the date such item is to be paid by Landlord and
        (ii) to the extent Landlord has not collected the full amount of such
        item prior to the date such item is to be paid by Landlord, Landlord may
        include the balance of such full amount in a revised monthly estimate
        for Additional Charges. If the Commencement Date or Expiration Date
        shall occur on a date other than the first day of a Tax Year and/or
        Expense Year, Tenant's Share of Real Estate Taxes and Expenses, for the
        Tax Year and/or Expense Year in which the Commencement Date occurs shall
        be prorated.

                      (vi) AUDIT. Within one hundred eighty (180) days after
        receipt of any Expense Statement or Tax Statement from Landlord, Tenant
        shall have the right to examine and copy Landlord's books and records
        relating to such Expense Statements and Tax Statements, or cause an
        independent audit thereof to be conducted by an accounting firm to be
        selected by Tenant and subject to the reasonable approval of Landlord.
        If the audit conclusively proves that Tenant has overpaid either
        Expenses or Real

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        Estate Taxes, then Landlord shall reimburse Tenant within thirty (30)
        days for such overage together with interest on such overpayment at the
        Default Rate (as defined in 3(d) below), and if such overage exceeds
        five percent (5%) of the actual amount of Expenses or Real Estate Taxes
        paid by Landlord for the Tax or Expense Year covered by such audit, then
        Landlord shall bear the reasonable cost of such audit, up to a maximum
        cost of $5,000. If Tenant fails to object to any such Expense Statement
        or Tax Statement or conduct an independent audit thereof within one
        hundred eighty (180) days after receipt thereof, such Expense Statement
        and/or Tax Statement shall be final and shall not be subject to any
        audit, challenge or adjustment. All information obtained through any
        audit by Tenant and any compromise, settlement or adjustment reached
        between Landlord and Tenant relative to the results of such audit shall
        be held in strict confidence by the Tenant.

               (d) LATE CHARGES. Tenant recognizes that late payment of any
Monthly Base Rent or Additional Charges will result in administrative expenses
to Landlord, the extent of which additional expense is extremely difficult and
economically impractical to ascertain. Tenant therefore agrees that if any
Monthly Base Rent or Additional Charges remain unpaid five (5) days after such
amount is due, the amount of such unpaid Monthly Base Rent or Additional Charges
shall be increased by a late charge to be paid to Landlord by Tenant in an
amount equal to four percent (4%) of the amount of the delinquent Monthly Base
Rent or Additional Charges. In addition, any outstanding Monthly Base Rent,
Additional Charges, late charges and other outstanding Rent amounts shall accrue
interest at an annualized rate of the lesser of (i) the greater of 10% or The
Federal Reserve Discount Rate plus 5%, until paid to Landlord, or (ii) the
maximum rate permitted by law ("the Default Rate"). Tenant agrees that such
amount is a reasonable estimate of the loss and expense to be suffered by
Landlord as a result of such late payment by Tenant and may be charged by
Landlord to defray such loss and expense. The provisions of this Paragraph 3(d)
in no way relieve Tenant of the obligation to pay Monthly Base Rent or
Additional Charges on or before the date on which they are due, nor do the terms
of this Paragraph 3(d) in any way affect Landlord's remedies pursuant to
Paragraph 19 in the event any Monthly Base Rent or Additional Charges are unpaid
after the date due.

        4. RESTRICTIONS ON USE. Tenant shall not use or allow the Premises to be
used for any unlawful purpose, nor shall Tenant cause or maintain or permit any
nuisance in, on or about the Premises. Tenant shall not commit or suffer the
commission of any waste in, on or about the Premises.

        5. COMPLIANCE WITH LAWS.

               (a) TENANT'S COMPLIANCE OBLIGATIONS. Tenant shall not use the
Project or permit anything to be done in or about the Project which will in any
way conflict with any present and future laws, statutes, ordinances,
resolutions, regulations, proclamations, orders or decrees of any municipal,
county, state or federal government or other governmental or regulatory
authority with jurisdiction over the Project, or any portion thereof, whether
currently in effect or adopted in the future and whether or not in the
contemplation of the parties hereto (collectively, "Laws"), and Tenant shall
promptly, at its sole expense, maintain the Premises, any Alterations (as
defined in Paragraph 6 below) permitted hereunder and Tenant's use and
operations thereon in strict compliance at all times with all Laws. "Laws" shall
include, without limitation, all Laws relating to health and safety (including,
without limitation, the California Occupational Safety and Health Act of 1973
and the California Safe Drinking Water and Toxic Enforcement Act of 1986,
including posting and delivery of notices required by such Laws with respect to
the Premises), disabled accessibility (including, without limitation, the
Americans with Disabilities Act, 42 U.S.C. section 12101 et seq.), Hazardous
Substances, and all present and future life safety, fire, sprinkler, seismic
retrofit, building code and municipal code requirements; provided however, that
Tenant's obligation to comply with Laws relating to Hazardous Substances is
subject to the terms and conditions of Paragraph 40, and Tenant shall not be
responsible for compliance with clean-up provisions of any Laws with respect to
Hazardous Substances except to the extent of any release caused by the Tenant or
any of its servants, employees, contractors, agents, licensees or invitees
(collectively, including Tenant, the "Tenant Parties") or otherwise included in
Tenant's indemnity contained in Paragraph 40. Notwithstanding the foregoing,
Landlord, and not Tenant, shall be responsible for correcting any condition with
respect to the exterior or structural portions of the Building (but not with
respect to the interior of the Premises), which is in violation of applicable
Laws (subject to Tenant's obligation to pay such costs to the extent they are
included as Expenses under Paragraph 3(c)(i)(D) above), except to the extent
such condition is caused by the negligent or intentional acts or omissions of
the Tenant Parties, or such violation results from Tenant's particular

                                     - 6 -
<PAGE>   11

use of the Premises, or such condition will be altered in connection with the
installation of any Alterations. Any Alterations that are Tenant's
responsibility pursuant to this Paragraph 5 shall be made in accordance with
Paragraph 6 below, at Tenant's sole cost. The parties acknowledge and agree that
Tenant's obligation to comply with all Laws as provided in this paragraph
(subject to the limitations contained herein) is a material part of the
bargained-for consideration under this Lease. Tenant's obligations under this
Paragraph and under Paragraph 7(c) below shall include, without limitation, the
responsibility of Tenant to make substantial or structural repairs and
alterations to the Premises to the extent provided above, regardless of, among
other factors, the relationship of the cost of curative action to the Rent under
this Lease, the length of the then remaining Term hereof, the relative benefit
of the repairs to Tenant or Landlord, the degree to which the curative action
may interfere with Tenant's use or enjoyment of the Premises, and the likelihood
that the parties contemplated the particular Law involved.

               (b) INSURANCE REQUIREMENTS. Tenant shall not do or permit
anything to be done in or about the Premises or bring or keep anything therein
which will in any way increase the rate of any insurance upon the Project or any
of its contents (unless Tenant agrees to pay for such increase) or cause a
cancellation of any insurance on the Project or otherwise violate any
requirements, guidelines, conditions, rules or orders with respect to such
insurance. Tenant shall at its sole cost and expense promptly comply with the
requirements of the Insurance Services Office (ISO), board of fire underwriters,
or other similar body now or hereafter constituted relating to or affecting
Tenant's use or occupancy of the Project (other than in situations where
compliance involves repair, maintenance or replacement of items that Landlord is
expressly required to repair, maintain or replace under this Lease).

               (c) NO LIMITATION ON OBLIGATIONS. The provisions of this
Paragraph 5 shall in no way limit Tenant's maintenance, repair and replacement
obligations under Paragraph 7 or Tenant's obligation to pay Expenses under
Paragraph 3(c). The judgment of any court of competent jurisdiction or the
admission of Tenant in an action against Tenant, whether Landlord is a party
thereto or not, that Tenant has so violated any such Law shall be conclusive of
such violation as between Landlord and Tenant.

        6. ALTERATIONS.

               (a) Tenant shall not make or suffer to be made any additional
alterations, additions or improvements ("Alterations") in, on or to the Premises
or any part thereof without the prior written consent of Landlord. Failure of
Landlord to give its approval within fifteen (15) calendar days after receipt of
Tenant's written request for approval shall constitute disapproval by Landlord.
Any Alterations in, on or to the Premises, except for Tenant's trade fixtures
and movable furniture and equipment, shall be the property of Tenant during the
Term and shall become Landlord's property at the end of the Term without
compensation to Tenant. Landlord shall not unreasonably withhold or delay its
consent to Alterations that (i) do not materially affect the structure of the
Building or its electrical, plumbing, HVAC, security or other systems, (ii) are
not visible from the exterior of the Premises and do not otherwise affect the
exterior appearance of the Building, (iii) are consistent with Tenant's
Permitted Use hereunder; (iv) do not require any application to a political
jurisdiction for rezoning, general plan amendment, variance, conditional use
permit or architectural review approval, (v) will not interfere with the use and
occupancy of any other portion of the Project by Landlord or by any other
tenants or occupants or their invitees, or by any other party with the right to
use any portion of the Project, (vi) comply with any ground lease, CC&Rs
(including without limitation the CC&Rs described in EXHIBIT C) and Mortgages,
and (vii) do not adversely affect the value or marketability of Landlord's
reversionary interest upon termination or expiration of this Lease.

               (b) If Landlord consents to the making of any Alterations by
Tenant, the same shall be made by Tenant, at Tenant's sole cost and expense, in
accordance with plans and specifications submitted by Tenant to Landlord
concurrently with its request pursuant to Paragraph 6(a) and reasonably approved
by Landlord, and any contractor or person selected by Tenant to make the same
must first be reasonably approved in writing by Landlord. With respect to any
Alterations that affect the structure of the Building, the Building Systems, or
any portion of the Project outside the Premises, at Landlord's option the
Alterations shall be made by Landlord, or by a contractor specified by Landlord,
for Tenant's account and Tenant shall reimburse Landlord for the cost thereof
(including a reasonable charge for Landlord's overhead) as an Additional Charge,
within twenty (20) days after receipt of a statement from Landlord therefor.

                                     - 7 -
<PAGE>   12

               (c) Tenant shall reimburse Landlord upon demand for any
reasonable out-of-pocket expenses incurred by Landlord in the review of any
Alterations made by Tenant, including fees charged by Landlord's contractors or
consultants to review plans and specifications, and such obligation shall be an
Additional Charge. Landlord's consent to any Alterations shall not obligate
Landlord to repair, maintain, insure or otherwise assume any responsibility or
liability with respect to any such Alteration. In addition, notwithstanding
Landlord's review, Tenant and not Landlord shall be responsible for compliance
of the Alterations, and plans and specifications therefor, with all applicable
Laws, and Landlord shall not be responsible for any omissions or errors therein.

               (d) Upon the expiration or sooner termination of the Term, Tenant
shall upon demand by Landlord, at Landlord's election either (i) at Tenant's
sole cost and expense, forthwith and with all due diligence remove any
Alterations made by or for the account of Tenant, designated by Landlord to be
removed (provided, however, that upon the written request of Tenant prior to
installation of such Alterations, Landlord shall advise Tenant at that time
whether or not such Alterations must be removed upon the expiration or sooner
termination of this Lease), and restore the Premises to substantially its
original condition as of the Commencement Date, subject to normal wear and tear
and the rights and obligations of Tenant concerning casualty damage pursuant to
Paragraph 20 or (ii) pay Landlord the reasonable estimated cost thereof.

        7. REPAIR AND MAINTENANCE.

               (a) LANDLORD'S OBLIGATIONS.

                     (i) Landlord shall maintain, repair and replace, except as
        provided in Paragraph 7(c), the exterior (excluding windows and window
        frames), roof structure (but not the roof membrane) and structural
        portions of the Building (including load bearing walls and foundations).

                     (ii) Landlord shall maintain, repair and replace the
        parking areas courtyards, sidewalks, entryways, lawns, fountains,
        landscaping and other similar facilities located in the Common Area.

All costs incurred by Landlord in connection with the foregoing obligations
shall be payable by Tenant as Additional Charges in accordance with Paragraph
3(c) to the extent they are properly included in Expenses thereunder. Landlord's
obligations under this Paragraph 7(a) with respect to any particular repair,
replacement or maintenance requirement, shall not commence until Tenant
notifies Landlord in writing of any circumstances which Tenant believes may
trigger Landlord's obligations.

               (b) TENANT'S OBLIGATIONS. Tenant shall maintain, repair and
replace, at its sole cost and expense, all portions of the Premises which are
not Landlord's obligations under Paragraph 7(a), including, without limitation,
(i) the roof membrane, windows, and window frames; (ii) the building systems
serving the Premises for electrical, mechanical, HVAC and plumbing and all
controls appurtenant thereto, and any elevators in the Building (collectively,
including elevators, "Building Systems"); and (iii) the interior portion of the
Building, the Alterations, and any additional tenant improvements, alterations
or additions installed by or on behalf of Tenant within the Premises. Tenant
shall be responsible for the expense of installation, operation, and maintenance
of its telephone and other communications cabling from the point of entry into
the Building to the Premises and throughout the Premises, though Landlord shall
have the right to perform such work on behalf of Tenant in Common Areas,
provided Landlord performs such work in coordination with Tenant and its
contractors in such a manner as will accommodate Tenant's reasonable objectives
with respect thereto. The Premises shall at all times be maintained by Tenant in
the condition of a first-class office building. Tenant's obligations under this
Paragraph 7 include, without limitation, the replacement, at Tenant's sole cost
and expense, of any portions of the Premises or Building Systems which are not
Landlord's express responsibility under Paragraph 7(a), if it would be
commercially prudent to replace, rather than repair, such portions of the
Premises, regardless of whether such replacement would be considered a capital
expenditure. Tenant hereby waives and releases its right to make repairs at
Landlord's expense under Sections 1941 and 1942 of the California Civil Code or
under any similar law, statute or ordinance now or hereafter in effect. In
addition, Tenant hereby waives and releases its right to terminate this Lease
under Section 1932(1) of the California Civil Code or under any similar law,
statute or ordinance now or hereafter in effect.

                                     - 8 -
<PAGE>   13

               (c) ADDITIONAL OBLIGATIONS OF TENANT. The purpose of Paragraph
7(a) and 7(b) is to define the obligations of Landlord and Tenant to perform
various repair and maintenance functions; the allocation of the costs therefor
are covered under this Paragraph 7(c) and Paragraph 3. Tenant shall bear the
full cost of repairs or maintenance interior or exterior, structural or
otherwise, to preserve the Premises and the Building in good working order and
first-class condition, arising out of (i) the existence, installation, use or
operation of any Alterations or any of Tenant's trade fixtures or personal
property, (ii) the moving of Tenant's property or fixtures in or out of the
Building or Project or in and about the Premises (iii) the particular use or
particular occupancy or manner of use or occupancy of the Premises by any Tenant
Party; or (iv) except to the extent any claims arising from any of the foregoing
are reimbursed by insurance carried by Landlord, are covered by the waiver of
subrogation in Paragraph 11 or are otherwise provided for in Paragraph 20, the
acts, omissions or negligence of any Tenant Parties.

               (d) MAINTENANCE SERVICE CONTRACTS. In connection with Tenant's
maintenance and repair obligations contained in this Paragraph 7, Tenant shall,
at its own cost and expense, enter into regularly scheduled preventive
maintenance service contracts with maintenance contractors approved by Landlord,
in its reasonable discretion, for servicing all Building Systems, elevators and
equipment within the Premises, and shall provide copies of such contracts and
periodic maintenance reports to Landlord. At Landlord's option at any time in
which Tenant is in Default hereunder, maintenance service contracts shall be
prepaid on an annual basis. Each maintenance service contract shall specifically
name Landlord as a third party beneficiary, with the right to receive copies of
all notices delivered under such contract and the ability to exercise Tenant's
rights thereunder, at Landlord's election, in connection with any cure of
Tenant's default by Landlord, or any assumption by Landlord of Tenant's
maintenance obligations with respect to Building Systems, pursuant to Paragraph
7(e) below.

               (e) CURE RIGHTS. Tenant shall have a period of thirty (30) days
from the date of written notice from Landlord within which to cure any failure
to fulfill any of its obligations under this Paragraph 7; provided however, that
if such failure is curable but cannot be cured within such thirty (30) day
period, Tenant shall have such additional time as may be reasonably required to
cure (not to exceed sixty (60) additional days) so long as Tenant commences such
cure within such (30) day period and diligently prosecutes such cure to
completion. Landlord shall have the rights set forth in Paragraph 23 with
respect to any failure of Tenant to perform its obligations under this Paragraph
7. In addition, Landlord may elect, by delivery of written notice to Tenant, to
assume Tenant's maintenance obligations with respect to the Building Systems
under item (ii) of Paragraph 7(b) if Tenant does not cure any breach of such
obligations, or if Tenant has failed to perform such obligations more than once
in any twelve month period (without benefit of cure periods) upon the second
such failure. If Landlord assumes such obligations, all costs incurred by
Landlord in connection therewith shall be included in Expenses payable by Tenant
as Additional Charges in accordance with Paragraph 3(c). The remedies described
in this paragraph are cumulative and in addition to any other remedies Landlord
may have at law or under this Lease.

               (f) NO ABATEMENT. Except to the extent any claims arising from
any of the foregoing are reimbursed by rental abatement insurance proceeds
actually received by Landlord, are covered by the waiver of subrogation in
Paragraph 11 or are otherwise provided for in Paragraph 20, there shall be no
abatement of Rent with respect to, and except for Landlord's gross negligence or
willful misconduct, Landlord shall not be liable for any injury to or
interference with Tenant's business arising from, any repairs, maintenance,
alteration or improvement in or to any portion of the Project, including the
Premises, or in or to the fixtures, appurtenances and equipment therein.

        8. LIENS. Tenant shall keep the Premises free from any liens arising out
of any work performed, material furnished or obligations incurred by Tenant. In
the event that Tenant shall not, within ten (10) days following the imposition
of any such lien, cause the same to be released of record by payment or posting
of a proper bond, Landlord shall have, in addition to all other remedies
provided herein and by law, the right, but not the obligation, to cause the same
to be released by such means as it shall deem proper, including without
limitation by the payment of the claim giving rise to such lien or by the
posting of a bond. All such sums paid by Landlord and all expenses incurred by
Landlord in connection therewith shall be considered Additional Charges and
shall be payable to Landlord by Tenant on demand with interest from the date
incurred by Landlord at the Default Rate. Landlord shall have the right at all
times to post and keep posted on the Premises any notices permitted or required
by law, or which Landlord shall deem proper, for the protection of Landlord, the
Premises, the Project and any other

                                     - 9 -
<PAGE>   14

party having an interest therein, from mechanics' and materialmen's liens, and
Tenant shall give written notice to Landlord at least fifteen (15) business
days' prior to commencement of any construction on the Premises.

        9. ASSIGNMENT AND SUBLETTING.

               (a) Except as otherwise provided in this Paragraph 9, Tenant
shall not directly or indirectly, voluntarily or by operation of law, sell,
assign, encumber, pledge or otherwise transfer or hypothecate all or any part of
the Premises or Tenant's leasehold estate hereunder (collectively,
"Assignment"), or permit the Premises to be occupied by anyone other than Tenant
or sublet the Premises or any portion thereof (collectively, "Sublease"),
without Landlord's prior written consent in each instance, which consent shall
not be unreasonably withheld; provided, however, that Tenant shall have the
right to enter into an Assignment of Sublease to any affiliate of Tenant
pursuant to Paragraph 9(f) below or a Permitted Transfer pursuant to Paragraph
9(d) below. Without otherwise limiting the criteria upon which Landlord may
withhold its consent to any proposed Sublease or Assignment, if Landlord
withholds its consent where either (i) the creditworthiness of the proposed
Sublessee or Assignee is not reasonably acceptable to Landlord, or (ii) the
proposed Sublessee's or Assignee's use of the Premises is not in compliance with
the Permitted Use as described in the Basic Lease Information, such withholding
of consent shall be presumptively reasonable. If Landlord consents to the
Sublease or Assignment, Tenant may thereafter enter into a valid Sublease or
Assignment upon the terms and conditions set forth in this Paragraph 9.

               (b) If Tenant desires at any time to enter into an Assignment of
this Lease or a Sublease of the Premises or any portion thereof for which
Landlord's consent is required, it shall first give written notice to Landlord
of its desire to do so, which notice shall contain (i) the name of the proposed
assignee, subtenant or occupant; (ii) the name of the proposed assignee's,
subtenant, or occupant's business to be carried on in the Premises; (iii) the
terms and provisions of the proposed Assignment or Sublease; and (iv) such
financial information as Landlord may reasonably request concerning the proposed
assignee, subtenant or occupant.

               At any time within fifteen (15) days after Landlord's receipt of
the notice specified in Paragraph 9(b), Landlord may by written notice to Tenant
elect to (i) consent to the Sublease or Assignment; or (ii) disapprove the
Sublease or Assignment. In addition, Landlord may elect to terminate this Lease
as to the portion of the Premises that is specified in such notice, with a
proportionate abatement in Monthly Base Rent and Additional Charges for Expenses
and Taxes, if such notice is with respect to (x) any proposed Assignment, or (y)
any proposed Sublease and either (I) such Sublease has a term (including any
renewal or extension options) that either is coterminous with the Term or
expires within the last two years of the Term, or (II) after giving effect to
such Sublease, the original Tenant will occupy less than fifty percent (50%) of
the Rentable Area of the Premises. If Landlord elects to terminate the Lease as
to a portion of the Premises pursuant to the immediately preceding sentence,
Tenant shall at all times provide reasonable and appropriate access to such
portion of the Premises and use of any common facilities within the Building.
Promptly after request from Landlord, Tenant shall enter into any amendment to
this Lease or other documentation reasonably requested by Landlord in connection
with any such termination of this Lease as to a portion of the Premises. Failure
by Landlord to either consent to or disapprove a proposed Assignment or Sublease
within the fifteen (15) day time period specified above shall be deemed to be
Landlord's disapproval thereof. At Tenant's option, Tenant may notify Landlord
in writing if Tenant wishes to Assign or Sublease any portion of the Premises,
prior to commencing negotiations for an Assignment or Sublease with another
party, if such Assignment or Sublease would be subject to Landlord's termination
right provided above (such notice being the "Availability Notice"), and Landlord
shall have the option, by written notice to Tenant within fifteen (15) days
after receiving any Availability Notice, to terminate this Lease with respect to
the portion of the Premises as provided above. If Landlord declines or fails
timely to elect to terminate this Lease with respect to such portion of the
Premises, Tenant shall have the right, within one hundred twenty (120) days
after the expiration of such fifteen (15) day period, to enter into an
Assignment or Sublease with respect to the portion of the Premises designated in
the Availability Notice, subject to Landlord's consent and the other provisions
of this Paragraph 9, except that Landlord shall not have the further right to
terminate with respect to such Assignment or Sublease. If Tenant fails to enter
into an Assignment or Sublease within such one hundred twenty (120) day period,
or upon expiration of any Sublease entered into within such one hundred twenty
(120) day period, Landlord's rights under this Paragraph 9 to terminate the
Lease with respect to the portion of the Premises upon any future proposed
Sublease or Assignment shall revive. If Landlord consents to the Sublease or
Assignment within fifteen (15) days

                                     - 10 -
<PAGE>   15

after receipt of Tenant's notice as provided above, Tenant may thereafter within
one hundred twenty (120) days after Landlord's consent, but not later than the
expiration of said one hundred twenty (120) days, enter into such Assignment or
Sublease of the Premises or portion thereof upon the terms and conditions set
forth in the notice furnished by Tenant to Landlord pursuant to Paragraph 9(b).
However, Tenant shall pay to Landlord seventy-five percent (75%) of any rent or
other consideration realized by Tenant under any and all Subleases in excess of
the Monthly Base Rent and Additional Charges payable hereunder (or the amount
thereof proportionate to the portion of the Premises subject to such
Sublease(s)), including, without limitation, any sums paid for the sale or
rental of any Alterations, after first deducting from such excess costs
reasonably incurred for tenant improvements installed by Tenant (commensurate
with a standard office build-out) to obtain the Sublease or Assignment in
question, each of which are installed in that portion of the Premises which is
the subject of the Sublease or Assignment and which unamortized costs shall be
amortized on a straight line basis (without interest) over the term of the
Sublease or Assignment in equal installments, and after deducting therefrom any
customary brokers' commissions that Tenant has incurred in connection with such
Sublease amortized on a straight line basis (without interest) over the term of
the Sublease.

               (c) No consent by Landlord to any Assignment or Sublease by
Tenant shall relieve Tenant of any obligation to be performed by Tenant under
this Lease, whether arising before or after the Assignment or Sublease. The
consent by Landlord to any Assignment or Sublease shall not relieve Tenant from
the obligation to obtain Landlord's express written consent to any other
Assignment or Sublease. Any Assignment or Sublease that is not in compliance
with this Paragraph 9 shall be void and, at the option of Landlord, shall
constitute a material Default by Tenant under this Lease. The acceptance of
Monthly Base Rent or Additional Charges by Landlord from a proposed assignee or
sublessee shall not constitute the consent to such Assignment or Sublease by
Landlord.

               (d) The following shall be deemed a voluntary assignment of
Tenant's interest in this Lease: (i) any dissolution, merger, consolidation, or
other reorganization of Tenant; and (ii) if the capital stock of Tenant is not
publicly traded, the sale or transfer to one person or entity stock possessing
more than fifty percent (50%) of the total combined voting power of all classes
of Tenant's stock issued, outstanding and entitled to vote for the election of
directors. Notwithstanding anything to the contrary contained in this Paragraph
9, Tenant may enter into any of the following transfers (a "Permitted Transfer")
without Landlord's prior written consent: (1) Tenant may assign its interest in
the Lease to a corporation, partnership, limited liability company, or limited
liability partnership ("Transfer Entity") which results from a merger,
consolidation or other reorganization, so long as the surviving Transfer Entity
has a net worth immediately following such transaction that is equal to or
greater than the net worth of Tenant as of the date immediately prior to such
transaction; and (2) Tenant may assign this Lease to a Transfer Entity which
purchases or otherwise acquires all or substantially all of the assets of
Tenant, so long as such acquiring Transfer Entity has a net worth immediately
following such transaction that is equal to or greater than the net worth of
Tenant as of the date immediately prior to such transaction.

               (e) Each assignee pursuant to an Assignment as provided in this
Paragraph 9 shall assume all obligations of Tenant under this Lease, and shall
be and remain liable jointly and severally with Tenant for the payment of
Monthly Base Rent and Additional Charges, and for the performance of all the
terms, covenants, conditions and agreements herein contained on Tenant's part to
be performed for the Term. No Assignment shall be binding on Landlord unless the
assignee or Tenant shall deliver to Landlord a counterpart of the Assignment and
an instrument in recordable form that contains a covenant of assumption by the
assignee satisfactory in substance and form to Landlord, consistent with the
requirements of this Paragraph 9(e), but the failure or refusal of the assignee
to execute such instrument of assumption shall not release or discharge the
assignee from its liability as set forth above. Notwithstanding anything to the
contrary in this Lease, no Sublease shall be binding on Landlord unless and
until Landlord shall agree in writing following termination of this Lease to
recognize such sublessee and such sublessee agrees in writing to attorn to
Landlord on the terms and conditions of the sublease (including the obligations
under this Lease to the extent that they relate to the portion of the Premises
subleased), and any Sublease entered into by Tenant hereunder shall include an
obligation by the sublessee to so attorn to Landlord if Landlord, in Landlord's
sole discretion, elects to recognize such Sublease upon any termination of this
Lease.

               (f) Tenant shall have the right, without Landlord's consent and
without triggering Landlord's rights under Paragraph 9(b), but with written
notice to Landlord at least ten (10) days prior thereto, to enter into an

                                     - 11 -
<PAGE>   16

Assignment of Tenant's interest in the Lease or a Sublease of all or any portion
of the Premises to an Affiliate (as defined below) of Tenant, provided that (i)
in connection with an Assignment that is not a Sublease, the Affiliate delivers
to Landlord concurrent with such Assignment a written notice of the Assignment
and an assumption agreement whereby the Affiliate assumes and agrees to perform,
observe and abide by the terms, conditions, obligations, and provisions of this
Lease arising from and after the effective date of the assignment; and (ii) the
assignee or sublessee remains an Affiliate throughout the term of this Lease
(and, in connection with an Assignment that is not a Sublease, the assumption
agreement shall contain provisions consistent with the provisions of this
subparagraph allowing Landlord to terminate this Lease at such time as the
entity is no longer an Affiliate of the original Tenant). If this Lease is
assigned or sublet to an Affiliate and thereafter any circumstance occurs which
causes such assignee or sublessee to no longer be an Affiliate of the assigning
or subleasing Tenant, Tenant shall give written notice thereof to Landlord,
which notice, to become effective, shall refer to Landlord's right to terminate
this Lease pursuant to this subparagraph, in the event of an Assignment, or to
cause Tenant to terminate the Sublease, in the event of a Sublease ("Affiliation
Termination Notice"). Following occurrence of the circumstance giving rise to
the discontinuation of such assignee or sublessee being an Affiliate ("Affiliate
Termination") of the assigning or subleasing Tenant, Landlord shall be entitled
to terminate this Lease in the event of an Assignment, or to cause Tenant to
terminate the Sublease in the event of a Sublease, unless Landlord has given its
prior written consent to such circumstance which consent shall not be
unreasonably withheld by Landlord so long as, in the event of an Assignment,
such assignee (after giving effect to such circumstance) has financial strength
(as demonstrated by audited financial statements) equal to or greater than the
assigning or subleasing Tenant (including its net worth) as of the date of
execution of this Lease, or the assigning or subleasing Tenant executes a
guaranty in usual form reasonably acceptable to Landlord (however, this does not
imply that Tenant would be released without such guaranty). No Sublease or
Assignment by Tenant made pursuant to this paragraph shall relieve Tenant of
Tenant's obligations under this Lease. As used in this paragraph, the term
"Affiliate" shall mean and collectively refer to a corporation or other entity
which controls, is controlled by or is under common control with Tenant, by
means of an ownership of either (aa) more than fifty percent (50%) of the
outstanding voting shares of stock or partnership or other ownership interests,
or (bb) stock, or partnership or other ownership interests, which provide the
right to control the operations, transactions and activities of the applicable
entity.

        10. INSURANCE AND INDEMNIFICATION.

               (a) Except to the extent caused by the negligence or willful
misconduct of Tenant Parties or Tenant's breach of this Lease, Landlord shall
indemnify and hold Tenant harmless from and defend Tenant against any and all
claims or liability for any injury or damage to any person or property including
any reasonable attorney's fees (but excluding any consequential damages or loss
of business) occurring in, on, or about the Project to the extent such injury or
damage is caused by the gross negligence or willful misconduct of: (i) Landlord;
or (ii) Landlord's agents, servants, contractors or employees (collectively,
together with Landlord, "Landlord Parties"), provided, however, that in no event
shall Landlord be liable to Tenant for any losses arising from any interruption
of Tenant's business, or for lost profits, or for charges or expenses which
continue but would have been earned if the business had gone on without
interruption, or for any other loss, claim, cost, expense or damage which would
be covered by a standard policy of business interruption insurance, even if such
lost profits, charges, expenses, losses, claims, costs or damages caused by the
gross negligence or willful misconduct of Landlord's agents, servants,
contractors or employees.

               (b) Landlord shall not be liable to Tenant, and Tenant hereby
waives all claims against Landlord Parties for any injury or damage to any
person or property in or about the Premises by or from any cause whatsoever
(other than the gross negligence or willful misconduct of Landlord Parties), and
without limiting the generality of the foregoing, whether caused by water
leakage of any character from the roof, walls, basement, or other portion of the
Premises or the Building, or caused by gas, fire, oil, electricity, or any cause
whatsoever, in, on, or about the Premises, the Project or any part thereof
(other than that caused by the gross negligence or willful misconduct of
Landlord Parties); provided, however, that in no event shall Landlord be liable
to Tenant for any losses arising from any interruption of Tenant's business, or
for lost profits, or for charges or expenses which continue but would have been
earned if the business had gone on without interruption, or for any other loss,
claim, cost, expense or damage which would be covered by a standard policy of
business interruption insurance, even if caused by the gross negligence or
willful misconduct of Landlord's agents, servants, contractors or employees.

                                     - 12 -
<PAGE>   17

Tenant acknowledges that any casualty insurance carried by Landlord will not
cover loss of income to Tenant or damage to the Alterations in the Premises
installed by Tenant or Tenant's personal property located within the Premises
(except as provided in Paragraph 10(f) below). Tenant shall be required to
maintain the insurance described in Paragraph 10(d) below during the Term.

               (c) Except to the extent caused by the gross negligence or
willful misconduct of Landlord Parties, Tenant shall indemnify and hold Landlord
harmless from and defend Landlord against any and all claims or liability for
any injury or damage to any person or property whatsoever: (i) occurring in or
on the Premises; or (ii) occurring in, on, or about any other portion of the
Project to the extent such injury or damage shall be caused by the negligence or
willful misconduct by the Tenant Parties. Tenant further agrees to indemnify and
hold Landlord harmless from, and defend Landlord against, any and all claims,
losses, or liabilities (including damage to Landlord's property) arising from
(x) any breach of this Lease by Tenant, (y) any matter referred to in Paragraph
10(g), and/or (z) the conduct of any work or business of Tenant Parties in or
about the Project, including, but not limited to any release, discharge, storage
or use of any Hazardous Substance. In the event of a discrepancy between the
terms of this paragraph and the terms of Paragraph 40 of the Lease concerning
Hazardous Substance liability, the latter shall control. Notwithstanding the
foregoing, however, Tenant shall so indemnify, hold harmless and defend Landlord
with respect to losses arising from any interruption of Tenant's business, or
for lost profits, or for charges or expenses which continue but would have been
earned if the business had gone on without interruption, or for any other loss,
claim, cost, expense or damage which would be covered by a standard policy of
business interruption insurance, even if such losses resulted from the gross
negligence or willful misconduct of Landlord's agents, servants, contractors or
employees.

               (d) Tenant shall procure at its cost and expense and keep in
effect during the Term the following insurance:

                     (i) Commercial general liability insurance on an occurrence
        form, including contractual liability, with a minimum combined single
        limit of liability of Three Million Dollars ($3,000,000). Such insurance
        shall name Landlord, any Mortgagee, any ground lessor, and such other
        parties as Landlord may request as additional insureds, shall
        specifically include the liability assumed hereunder by Tenant, and
        shall provide that it is primary insurance, and not excess over or
        contributory with any other valid, existing and applicable insurance in
        force for or on behalf of Landlord, and shall provide that Landlord
        shall receive thirty (30) days' written notice from the insurer prior to
        any cancellation or change of coverage. The limits of such insurance
        shall not limit the liability of Tenant hereunder, and Tenant is
        responsible for ensuring that the amount of liability insurance carried
        by Tenant is sufficient for Tenant's purposes.

                     (ii) Intentionally Omitted;

                     (iii) "Special" (also known as "all risk") property
        insurance (including, without limitation, boiler and machinery (if
        applicable); sprinkler damage, vandalism and malicious mischief) on all
        of Tenant's personal property. Such insurance shall be in an amount
        equal to full replacement cost of the aggregate of the foregoing and
        shall provide coverage comparable to the coverage in the standard ISO
        All Risk form, when such form is supplemented with the coverages
        required above;

                     (iv) Worker's compensation insurance with limits as may be
        required by law.

                     (v) Such other insurance as may be required by Laws, or by
        Landlord to the extent it is commercially reasonable for tenants to be
        required to carry such other insurance under similar leases with respect
        to similar property in similar locations.

Insurance required under this Paragraph 10(d) shall be in companies rated "A"X
or better in "Best's Insurance Guide." Tenant shall deliver copies of policies
of such insurance and certificates naming the additional insureds thereof to
Landlord on or before the Commencement Date, and thereafter at least thirty (30)
days before the expiration dates of expiring policies; and, in the event Tenant
shall fail to procure such insurance, or to deliver such

                                     - 13 -
<PAGE>   18

policies or certificates, Landlord may, at its option after written notice to
Tenant, procure same for the account of Tenant, and the cost thereof shall be
paid to Landlord as Additional Charges within five (5) days after delivery to
Tenant of bills therefor.

               (e) The provisions of this Paragraph 10 shall survive the
expiration or termination of this Lease with respect to any claims or liability
occurring prior to such expiration or termination.

               (f) Landlord shall maintain insurance on the Project, including
the Building, and any Alterations installed in the Premises by Tenant at its
expense to the extent Tenant provides Landlord with all information reasonably
required by Landlord or its insurer in connection therewith (with the entire
cost of any such insurance on Alterations to be payable directly by Tenant to
Landlord as an Additional Charge, including the incremental cost to add such
insurance to Landlord's policies and any deductibles payable with respect to
such Alterations), against fire and risks covered by "special" coverage (also
known as "all risk") (excluding earthquake and flood, though Landlord, at its
sole option, may include this coverage) on a 100% of "replacement cost" basis
(though reasonable deductibles may be included under such coverage). Landlord's
insurance shall also have a building ordinance provision and shall provide for
rental interruption insurance covering a period of twelve (12) full months. In
no event shall Landlord be deemed a co-insurer under such policy. Landlord shall
also maintain commercial general liability insurance on an occurrence basis in
amounts not less than Three Million Dollars ($3,000,000) per occurrence with
respect to bodily injury or death and property damage in the Project.
Notwithstanding the foregoing obligations of Landlord to carry insurance,
Landlord may modify the foregoing coverages if and to the extent it is
commercially reasonable to do so. Landlord agrees to provide Tenant, upon
written request, with certificates of insurance evidencing the foregoing
coverages. Tenant acknowledges that, notwithstanding any provision of this
Paragraph 10(f) or any other provision of this Lease, Landlord currently intends
to carry earthquake insurance on the Project during the Term of this Lease.

               (g) Tenant acknowledges that even if Landlord installs and
operates security cameras or other security equipment and/or provides any other
services that could be construed as being intended to enhance security, Landlord
shall have no obligation to Tenant or to any of Tenant's Parties for any damage,
claim, loss or liability related to any claim that Landlord had a duty to
provide security or that the equipment or services provided by Landlord were
inadequate, inoperative or otherwise failed to provide adequate security. Any
such claim made against Landlord by any employee, customer or invitee of Tenant
shall be included within Tenant's obligation of indemnity and defense set forth
in Paragraph 10(c) above.

        11. WAIVER OF SUBROGATION. Notwithstanding anything to the contrary in
this Lease, the parties hereto release each other (including Landlord Parties
and Tenant Parties) and their respective agents, employees, successors,
assignees and subtenants from all liability for injury to any person or damage
to any property that is caused by or results from a risk (i) which is actually
insured against, to the extent of receipt of payment under such policy (unless
the failure to receive payment under any such policy results from a failure of
the insured party to comply with or observe the terms and conditions of the
insurance policy covering such liability, in which event, such release shall not
be so limited), (ii) which is required to be insured against under this Lease,
without regard to the negligence or willful misconduct of the entity so
released, or (iii) which would normally be covered by the standard form of
"special" or "all risk" coverage property insurance. Landlord and Tenant shall
each obtain from their respective insurers under all policies of fire, theft,
and other property insurance maintained by either of them at any time during the
Term insuring or covering the Building, the Premises, or the Project or any
portion thereof of its contents therein, a waiver of all rights of subrogation
which the insurer of one party might otherwise, if at all, have against the
other party and Landlord and Tenant shall each indemnify the other against any
loss or expense, including reasonable attorneys' fees, resulting from the
failure to obtain such waiver.

        12. SERVICES AND UTILITIES.

               (a) Landlord shall provide the maintenance and repairs described
in Paragraph 7(a), except for damage occasioned by the act or omission of Tenant
or for which Tenant is responsible pursuant to Paragraph 10(c), which damage
shall be repaired by Landlord at Tenant's expense.

                                     - 14 -
<PAGE>   19

               (b) Subject to the provisions elsewhere herein contained and to
the Rules and Regulations, Tenant shall be responsible for arranging for, and
direct payment of any and all cost of, garbage pickup, recycling, janitorial,
security, transportation management programs, water, electricity, gas,
telephone, cable and digital services, and Tenant shall provide the maintenance,
repair and replacement of Building Systems in connection with such utilities and
services, and Tenant shall provide the maintenance, repair and services as
described in Paragraph 7(b). Landlord shall cooperate with Tenant's efforts to
arrange all such services. If Landlord assumes Tenant's maintenance obligations
with respect to the Building Systems pursuant to Paragraph 7(e), Tenant shall
cooperate fully with Landlord and abide by all the reasonable regulations and
requirements that Landlord may prescribe for the proper functioning and
protection of the Building Systems.

               (c) Tenant will not without the written consent of Landlord,
which consent shall not be unreasonably withheld or delayed, use any apparatus
or device in the Premises which, when used, puts an excessive load on the
Building or its structure or systems, including, without limitation, electronic
data processing machines, punch card machines and machines using excess lighting
or voltage in excess of the amount for which the Building is designed.

               (d) Landlord shall not be in default hereunder, nor be deemed to
have evicted Tenant, nor be liable for any damages directly or indirectly
resulting from, nor shall the rental herein reserved be abated, except as
expressly provided for in the last sentence of this paragraph, by reason of (i)
the installation, use or interruption of use of any equipment in connection with
the foregoing utilities and services; (ii) failure to furnish or delay in
furnishing any services to be provided by Landlord when such failure or delay is
caused by Acts of God or the elements, labor disturbances of any character, any
other accidents or other conditions beyond the reasonable control of Landlord,
or by the making of repairs or improvements to the Premises or to the Building
(except in the case of Landlord's gross negligence or willful misconduct); or
(iii) the limitation, curtailment, rationing or restriction on use of water or
electricity, gas or any other form of energy or any other service or utility
whatsoever serving the Premises or the Project. Furthermore, Landlord shall be
entitled to cooperate with the mandatory requirements of national, state or
local governmental agencies or utilities suppliers in connection with reducing
energy or other resources consumption. If the Premises become unsuitable for
Tenant's use as a consequence of cessation of gas and electric utilities or
other services provided to the Premises resulting from a casualty covered by
Landlord's insurance, then Tenant's Monthly Base Rent and Additional Charges
shall abate during the period of time in which Tenant cannot occupy the Premises
for the Permitted Uses, but only to the extent of rental abatement insurance
proceeds received by Landlord.

        13. TENANT'S CERTIFICATES. Tenant, at any time and from time to time,
within ten (10) days from receipt of written notice from Landlord, will execute,
acknowledge and deliver to Landlord and, at Landlord's request, to any
prospective tenant, purchaser, ground or underlying lessor or mortgagee of any
part of the Project any other party acquiring an interest in Landlord, a
certificate of Tenant substantially in the form attached as EXHIBIT E and also
containing any other information that may reasonably be required by any of such
persons. It is intended that any such certificate of Tenant delivered pursuant
to this Paragraph 13 may be relied upon by Landlord and any prospective tenant,
purchaser, ground or underlying lessor or mortgagee of any part of the Project,
or such other party.

        14. HOLDING OVER. If Tenant (directly or through any
successor-in-interest of Tenant) remains in possession of all or any portion of
the Premises after the expiration of the Term or the termination of this Lease
with the written consent of Landlord, such continued possession shall be
construed to be a tenancy from month to month at one hundred twenty-five percent
(125%) of the Monthly Base Rent payable in the last full month prior to such
termination or expiration (and shall be increased in accordance with Paragraph
3(b)), together with an amount estimated by Landlord for the monthly Additional
Charges for Expenses and Taxes payable under this Lease, and shall otherwise be
on the terms and conditions herein specified so far as applicable. If Tenant
(directly or through any successor-in-interest of Tenant) remains in possession
of all or any portion of the Premises after the expiration of the Term or the
termination of this Lease without the written consent of Landlord, Tenant's
continued possession shall be on the basis of a tenancy at the sufferance of
Landlord. In such event, Tenant shall continue to comply with or perform all the
terms and obligations of Tenant under this Lease, except that the Monthly Base
Rent during Tenant's holding over shall be the greater of the then fair market
rent for the Premises (as reasonably determined by

                                     - 15 -
<PAGE>   20

Landlord) or one hundred fifty percent (150%) of the Monthly Base Rent and
Additional Charges for Expenses and Taxes payable in the last full month prior
to the termination or expiration of this Lease (and shall be increased in
accordance with Paragraph 3(b). In addition to Rent, Tenant shall pay Landlord
for all damages proximately caused by reason of the Tenant's retention of
possession. Landlord's acceptance of Rent after the expiration of the Term or
termination of the Term of this Lease shall not constitute a renewal of this
Lease, and nothing contained in this provision shall be deemed to waive
Landlord's right of re-entry or any other right hereunder or at law. Tenant
acknowledges that, in Landlord's marketing and re-leasing efforts for the
Premises, Landlord is relying on Tenant's vacation of the Premises on the
Expiration Date. Accordingly, Tenant shall indemnify, defend and hold Landlord
harmless from and against all claims, liabilities, losses, costs, expenses and
damages arising or resulting directly or indirectly from Tenant's failure to
timely surrender the Premises, including (i) any loss, cost or damages suffered
by any prospective tenant of all or any part of the Premises, and (ii)
Landlord's damages as a result of such prospective tenant rescinding or refusing
to enter into the prospective lease of all or any portion of the Premises by
reason of such failure of Tenant to timely surrender the Premises.

        15. SUBORDINATION. Without the necessity of any additional document
being executed by Tenant for the purpose of effecting a subordination, this
Lease shall be subject and subordinate at all times to: (i) all ground leases or
underlying leases which may now exist or hereafter be executed affecting all or
any portion of the Project, (ii) any CC&Rs (including without limitation the
CC&Rs described in EXHIBIT C), and (iii) the lien of any mortgage or deed of
trust which may now exist or hereafter be executed in any amount for which all
or any portion of the Project, ground leases or underlying leases, or Landlord's
interest or estate in any of said items, is specified as security (any of the
foregoing, a "Mortgage", and the beneficiary or mortgagee under any of the
foregoing, a "Mortgagee"). Notwithstanding the foregoing, Landlord shall have
the right to subordinate or cause to be subordinated any such ground leases or
underlying leases or any such Mortgages to this Lease. In the event that any
ground lease or underlying lease terminates for any reason or any Mortgage is
foreclosed or a conveyance in lieu of foreclosure is made for any reason, Tenant
shall, notwithstanding any subordination, attorn to and become the Tenant of the
successor in interest to Landlord at the option of such successor in interest.
Notwithstanding anything to the contrary contained herein, this Lease shall not
be subject or subordinate to any ground or underlying lease or to any Mortgage,
unless the ground lessor or Mortgagee executes a reasonable recognition and
non-disturbance agreement which provides that Tenant shall be entitled to
continue in possession of the Premises on the terms and conditions of this Lease
if and for so long as Tenant fully performs all of its obligations hereunder.
Landlord and Tenant covenant and agree to cooperate in efforts to obtain a
mutually acceptable form of subordination, non-disturbance and attornment
agreement from Landlord's current Mortgagee, and Tenant covenants and agrees to
execute and deliver upon demand by Landlord and in the form requested by
Landlord and reasonably acceptable to Tenant (Tenant has approved the form of
the subordination, non-disturbance and attornment agreement attached as EXHIBIT
F, without limiting Tenant's future approval of any additional or substitute
form), any customary additional documents evidencing the priority or
subordination of this Lease with respect to any such ground leases or underlying
leases or the lien of any such Mortgage. Tenant shall execute, deliver and
record any such documents within ten (10) days after Landlord's written request.

        16. RULES AND REGULATIONS. Tenant shall faithfully observe and comply
with the rules and regulations attached to this Lease as EXHIBIT D and all
reasonable modifications thereof and additions thereto from time to time put
into effect by Landlord. Landlord shall not be responsible for the
nonperformance by any other Tenant or occupant of the Building or the Project of
any said rules and regulations. In the event of an express and direct conflict
between the terms, covenants, agreements and conditions of this Lease and those
set forth in the rules and regulations, as modified and amended from time to
time by Landlord, this Lease shall control.

        17. RE-ENTRY BY LANDLORD. Landlord reserves and shall at all reasonable
times, upon reasonable prior notice (except in the case of an emergency), and
subject to Tenant's reasonable security precautions and the right of Tenant to
accompany Landlord at all times, have the right to re-enter the Premises to
inspect the same, to supply janitor service and any other service to be provided
by Landlord to Tenant hereunder (unless Tenant is supplying such service), to
show the Premises to prospective purchasers, Mortgagees or tenants (as to
prospective tenants, only during the last eighteen (18) months of the Term), to
post notices of nonresponsibility or as otherwise required or allowed by this
Lease or by law, and to alter, improve or repair the Premises and any portion of
the Building and may for that purpose erect, use, and maintain scaffolding,
pipes, conduits, and other necessary

                                     - 16 -
<PAGE>   21

structures in and through the Premises where reasonably required by the
character of the work to be performed. Landlord shall not be liable in any
manner for any inconvenience, disturbance, loss of business, nuisance or other
damage arising from Landlord's entry and acts pursuant to this paragraph and
Tenant shall not be entitled to an abatement or reduction of Monthly Base Rent
or Additional Charges if Landlord exercises any rights reserved in this
paragraph. Tenant hereby waives any claim for damages for any injury or
inconvenience to or interference with Tenant's business, any loss of occupancy
or quiet enjoyment of the Premises, and any other loss occasioned thereby,
except to the extent caused by Landlord's gross negligence or willful
misconduct. For each of the aforesaid purposes, Landlord shall at all times have
and retain a key with which to unlock all of the doors in, upon and about the
Premises, excluding Tenant's vaults and safes, or special security areas
(designated in advance), and Landlord shall have the right to use any end all
means which Landlord may deem necessary or proper to open said doors in an
emergency, in order to obtain entry to any portion of the Premises, and any
entry to the Premises, or portion thereof obtained by Landlord by any of said
means, or otherwise, shall not under any emergency 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
portions thereof. Landlord shall use commercially reasonable efforts during
re-entry to not unreasonably interfere with Tenant's use of the Premises or its
business conducted therein.

        18. INSOLVENCY OR BANKRUPTCY. The appointment of a receiver to take
possession of all or substantially all of the assets of Tenant, or an assignment
of Tenant for the benefit of creditors, or any action taken or suffered by
Tenant under any insolvency, bankruptcy, reorganization or other debtor relief
proceedings, whether now existing or hereafter amended or enacted, shall at
Landlord's option constitute a breach of this Lease by Tenant (provided that,
with respect to a petition in bankruptcy, or receiver attachment, or other
remedy pursued by a third party, such event shall not constitute a breach of
this Lease so long as it is discharged within sixty (60) days). Upon the
happening of any such event or at any time thereafter, this Lease shall
terminate five (5) days after written notice of termination from Landlord to
Tenant. In no event shall this Lease be assigned or assignable by operation of
law or by voluntary or involuntary bankruptcy proceedings or otherwise and in no
event shall this Lease or any rights or privileges hereunder be an asset of
Tenant under any bankruptcy, insolvency, reorganization or other debtor relief
proceedings.

        19. DEFAULT.

               (a) 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 (which notice shall be in lieu of and not in addition to the notice
required by Section 1161 of the California Code of Civil Procedure) within which
to cure any failure to pay Monthly Base Rent or Additional Charges; provided,
however, that Landlord shall not be required to provide such notice more than
two (2) times during any two (2) year period during the Term with respect to
non-payment of Monthly Base Rent or Additional Charges, the third such
non-payment constituting Default without requirement of notice. Tenant shall
have a period of thirty (30) days from the date of receipt of written notice
from Landlord within which to cure any other Default under this Lease; provided,
however, that with respect to any curable Default other than the payment of
Monthly Base Rent or Additional Charges that cannot reasonably be cured within
thirty (30) days, the cure period shall be extended for an additional period of
time reasonably required to cause such cure if Tenant commences to cure within
thirty (30) days from Landlord's notice and continues to prosecute diligently
the curing thereof, provided that such cure period shall in no event extend
beyond ninety (90) days after Landlord's notice. Notwithstanding the foregoing,
(i) if a different cure period is specified elsewhere in this Lease with respect
to any specific obligation of Tenant, such specific cure period shall apply with
respect to a failure of such obligation in lieu of, and not in addition to, the
cure period provided in this Paragraph 19(a); and (ii) the cure periods
specified in Paragraphs 7(e) and 23 shall apply with respect to Landlord's
rights to cure Tenant's failure to perform pursuant to Paragraphs 7(e) and 23,
respectively. Upon a 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:

                      (i) The rights and remedies provided 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

                                     - 17 -
<PAGE>   22

        Monthly Base Rent and Additional Charges for the balance of the Term
        after the time of award exceeds the amount of rental loss for the same
        period that the Tenant proves could be reasonably avoided, as computed
        pursuant to subsection (b) of said Section 1951.2;

                      (ii) The rights and remedies provided by California Civil
        Code, Section 1951.4, that allows Landlord to continue this Lease in
        effect and to enforce all of its rights and remedies under this Lease,
        including the right to recover Monthly Base Rent and Additional Charges
        as they become due, for so long as Landlord does not terminate Tenant's
        right to possession; provided, however, if Landlord elects to exercise
        its remedies described in this Paragraph 19(a)(ii) and Landlord does not
        terminate this Lease, and if Tenant requests Landlord's consent to an
        assignment of this Lease or a sublease of the Premises at such time as
        Tenant is in Default, Landlord shall not unreasonably withhold its
        consent to such assignment or sublease. 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 rights to
        possession;

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

                      (iv) If Landlord elects to terminate this Lease, the right
        and power to enter the Premises and remove therefrom all persons and
        property and, 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.

               (b) Landlord shall have a period of thirty (30) days from the
date of written notice from Tenant within which to cure any default of Landlord
under this Lease; provided, however, that with respect to any default that
cannot reasonably be cured within thirty (30) days, the default shall not be
deemed to be uncured if Landlord commences to cure within thirty (30) days from
Tenant's notice and continues to prosecute diligently the curing thereof. Tenant
agrees to deliver to any Mortgagee a copy of any Notice of Default served upon
the Landlord in the manner prescribed by Paragraph 26 hereof, provided that
prior to such notice Tenant has been notified in writing (by way of Notice of
Assignment of Rents and Leases, or otherwise) of the address of such Mortgagee.
Tenant further agrees that if Landlord shall have failed to cure such default
within the time provided for in this Lease, then the Mortgagee shall have an
additional thirty (30) days (provided that Tenant notifies Mortgagee
concurrently with Tenant's notice to Landlord at the beginning of Landlord's
thirty (30) day period; otherwise Mortgagee shall have sixty (60) days from the
date on which it is noticed) within which to cure such default or if such
default cannot be cured within that time, then such additional time as may be
reasonably necessary to cure such default shall be granted if within such
applicable period Mortgagee has commenced and is diligently pursuing the
remedies necessary to cure such default (including, but not limited to,
commencement of foreclosure proceedings, if necessary to effect such cure), in
which event the Lease shall not be terminated while such remedies are being so
diligently pursued.

        20. DAMAGE BY FIRE, ETC.

               (a) RESTORATION OR TERMINATION. If the Premises or the Building
are damaged by fire or other casualty, Landlord shall forthwith repair the same,
provided that such repairs can be made within one hundred eighty (180) days
after the date of such damage under the laws and regulations of the federal,
state and local governmental authorities having jurisdiction thereof. In such
event, this Lease shall remain in full force and effect except that Tenant shall
be entitled to a proportionate reduction of Monthly Base Rent and Additional
Charges while such repairs to be made hereunder by Landlord are being made. Such
reduction of Monthly Base Rent and Additional Charges, if any, shall be based
upon the greater of (i) the proportion that the area of the Premises rendered
untenantable by such damage bears to the total area of the Premises; or (ii) the
extent to which such damage and the making of such repairs by Landlord shall
interfere with the business carried on by Tenant in the Premises, and shall be
limited to the extent of rental abatement insurance proceeds actually received
by Landlord under Landlord's casualty insurance policy. Within thirty (30) days
after the date of such damage, Landlord shall notify Tenant whether or not in
Landlord's reasonable opinion such repairs can be made within one hundred eighty

                                     - 18 -
<PAGE>   23

(180) days after the date of such damage and Landlord's reasonable estimate of
the time needed for such repairs. If such repairs cannot be made within one
hundred eighty (180) days from the date of such damage, Landlord shall within
thirty (30) days after the date of such damage elect either to: (i) notify
Tenant of Landlord's intention to repair such damage and diligently prosecute
such repairs, in which event this Lease shall continue in full force and effect
and the Monthly Base Rent and Additional Charges shall be reduced as provided
herein; or (ii) notify Tenant of Landlord's election to terminate this Lease as
of a date specified in such notice, which date shall not be less than thirty
(30) days nor more than sixty (60) days after such notice is given and this
Lease shall terminate on the date specified in such notice. If Landlord notifies
Tenant that restoration or repair of the Premises will take more than one
hundred eighty (180) days, Tenant shall have a right to terminate the Lease
within fifteen (15) days following receipt of Landlord's notice, by providing
Landlord with written notice of its election to do so. in such event (and also
in the event Landlord terminates the Lease pursuant to the immediately preceding
sentence), Tenant shall have no liability for payment of the deductible under
Landlord's insurance relating to such damage. In case of termination by either
event, the Monthly Base Rent and Additional Charges shall be reduced by a
proportionate amount based upon the extent to which such damage interfered with
the business carried on by Tenant in the Premises, and Tenant shall pay such
reduced Monthly Base Rent and Additional Charges up to the date of termination.
Landlord agrees to refund to Tenant any Monthly Base Rent and Additional Charges
previously paid for any period of time subsequent to such date of termination.
The repairs to be made hereunder by Landlord shall not include, and Landlord
shall not be required to repair, any damage by fire or other cause to the
property of Tenant or any repairs or replacements of any paneling, decorations,
railings, floor coverings or any alterations, additions, fixtures or
improvements installed on the Premises by or at the expense of Tenant; provided,
however, that to the extent Landlord's insurance policies cover any Alterations
pursuant to Paragraph 10(f), Landlord shall make available to Tenant any
available insurance proceeds with respect to any damage or destruction that
affects such Alterations, after deducting therefrom the cost, if any, to
Landlord for the recovery of such proceeds and/or of any repair to the Building
or Premises or Project for which Landlord is responsible hereunder, in order for
Tenant to repair and restore such Alterations, pursuant to disbursement
procedures established by Landlord and/or any Mortgagee. Tenant hereby waives
the provisions of Section 1932.2, and Section 1933.4, of the Civil Code of
California. Notwithstanding anything contained herein to the contrary, if a
Major Casualty (as defined below) occurs with respect to any portion of the
Building, and the net insurance proceeds obtained as a result of such casualty
are ninety percent (90%) or a lesser percentage of the cost of restoration,
rebuilding or replacement, then Landlord shall not be obligated to undertake
such restoration, rebuilding or replacement unless Landlord elects to do so in
writing, provided that Landlord's election not to restore shall be deemed
Landlord's election to terminate. For the purpose of this Lease, a "Major
Casualty" shall mean a casualty that renders unusable twenty percent (20%) or
more of the Net Rentable Area of the Building or which materially adversely
affects the use of such Building.

               (b) CASUALTY AT END OF TERM. Notwithstanding anything to the
contrary contained in this Lease, if during the twelve (12) months prior to the
expiration of the Term, either of the Building or a substantial portion thereof
are damaged or destroyed by fire or other casualty, either Tenant or Landlord
shall have the option to terminate this Lease as of the date of such damage or
destruction by written notice to the other party given within thirty (30) days
after such damage or destruction, in which event Landlord shall make a
proportionate refund to Tenant of such Rent as may have been paid in advance.
For purposes of this paragraph, a "substantial portion" shall mean fifty percent
(50%) of the Building.

               (c) UNINSURED CASUALTY. Notwithstanding Paragraph 20(a), and
subject to the termination right in Paragraph 20(b), in the event of a total or
partial destruction of the Premises (i) by a casualty of a type not required to
be insured against by Landlord under the terms of this Lease, or (ii) under
circumstances where Landlord has been required by any Mortgagee to utilize
substantially all of the insurance proceeds to pay down the Mortgage, which
destruction exceeds five percent (5%) of the replacement cost of the Building,
this Lease shall automatically terminate, unless (x) Landlord elects to
reconstruct the Building, and (y) the damage can be reconstructed within one
hundred eighty (180) days after the date of such damage. If Landlord elects to
reconstruct, the cost incurred by Landlord for such reconstruction shall be
amortized over the useful life of the Building and such amortization shall be
reimbursed by Tenant to Landlord as an Additional Charge together with interest
at the Default Rate; provided, however, that Tenant shall not be obligated to
pay for any portion of the useful life of the Building which extends beyond the
Expiration Date.

                                     - 19 -
<PAGE>   24

        21. EMINENT DOMAIN. If any part over fifteen percent (15%) of the
Premises shall be taken or appropriated under the power of eminent domain or
conveyed in lieu thereof, Tenant shall have the right to terminate this Lease at
its option. In such event, Landlord shall receive (and Tenant shall assign to
Landlord upon demand from Landlord) any income, rent, award or any interest
therein which may be paid in connection with the exercise of such power of
eminent domain, and Tenant shall have no claim against Landlord for any part of
sum paid by virtue of such proceedings, whether or not attributable to the value
of the unexpired term of this Lease except that Tenant shall be entitled to
petition the condemning authority for the following: (i) the then unamortized
cost of any Alterations paid for by Tenant from its own funds (as opposed to any
allowance, including the Tenant Allowance, provided by Landlord); (ii) the value
of Tenant's trade fixtures; (iii) Tenant's relocation costs; and (iv) Tenant's
goodwill, loss of business and business interruption. 1f a part of the Premises
shall be so taken or appropriated or conveyed and neither party hereto shall
elect to terminate this Lease and the Premises have been damaged as a
consequence of such partial taking or appropriation or conveyance, Landlord
shall restore the Premises continuing under this Lease at Landlord's cost and
expense; provided, however, that Landlord shall not be required to repair or
restore any injury or damage to the property of Tenant or to make any repairs or
restoration of any Alterations installed on the Premises by or at the expense of
Tenant. Thereafter, the Monthly Base Rent and Additional Charges to be paid
under this Lease for the remainder of the Term shall be proportionately reduced,
such that thereafter the amounts to be paid by Tenant shall be in the ratio that
they are of the portion of the Premises not so taken bears to the total area of
the Premises prior to such taking. Notwithstanding anything to the contrary
contained in this Paragraph 21, if the temporary use or occupancy of any part of
the Premises shall be taken or appropriated under power of eminent domain during
the Term, this Lease shall be and remain unaffected by such taking or
appropriation and Tenant shall continue to pay in full all Monthly Base Rent and
Additional Charges payable hereunder by Tenant during the Term. In the event of
any such temporary appropriation or taking, Tenant shall be entitled to receive
that portion of any award which represents compensation for the use of or
occupancy of the Premises during the Term, and Landlord shall be entitled to
receive that portion of any award which represents the cost of restoration of
the Premises and the use and occupancy of the Premises after the end of the
Term. If such temporary taking is for a period longer than two hundred and
seventy (270) days and unreasonably interferes with Tenant's use of the Premises
or the Common Area, then Tenant shall have the right to terminate the Lease.
Landlord and Tenant understand and agree that the provisions of this Paragraph
21 are intended to govern fully the rights and obligations of the parties in the
event of a Taking of all or any portion of the Premises. Accordingly, the
parties each hereby waives any right to terminate this Lease in whole or in part
under Sections 1265.120 and 1265.130 of the California Code of Civil Procedure
or under any similar Law now or hereafter in effect.

        22. SALE BY LANDLORD. If Landlord sells or otherwise conveys its
interest in the Premises, Landlord shall be relieved of its obligations under
the Lease from and after the date of sale or conveyance (including the
obligations of Landlord under Paragraph 40), only when the successor assumes in
writing the obligations to be performed by Landlord on and after the effective
date of the transfer, whereupon Tenant shall attorn to such successor.

        23. RIGHT OF LANDLORD TO PERFORM. All covenants and agreements to be
performed by Tenant under any of the terms of this Lease shall be performed by
Tenant at Tenant's sole cost and expense and without any abatement of Monthly
Base Rent or Additional Charges. If Tenant shall default in the payment of any
sum of money, other than Monthly Base Rent or Additional Charges, required to be
paid by it hereunder or shall fail to perform any other act on its part to be
performed hereunder (including, without limitation, Tenant's obligation to
maintain and repair the Premises and Building Systems pursuant to Paragraph
7(b)), and either (i) such failure continues, and Tenant does not commence cure
of such failure, for ten (10) days after notice thereof by Landlord as provided
in Paragraph 19(a) (except in the event of emergency, when no cure period shall
be required but Landlord shall make reasonable good faith efforts to notify
Tenant prior to commencing such emergency cure), or (ii) having commenced such
cure Tenant does not diligently prosecute the curing thereof, or (iii) if
Landlord is, in Landlord's reasonable business judgment, in a better position to
accomplish such cure or can accomplish such cure in a more efficient or
cost-effective manner than Tenant, or (iv) if a default under any Mortgage is,
in Landlord's reasonable judgment, likely to occur due to Tenant's failure to
cure such failure in a timely manner, then in any such situation Landlord may,
but shall not be obligated so to do, and without waiving or releasing Tenant
from any obligations of Tenant, make any such payment or perform any such act on
Tenant's part to be made or performed as provided in this Lease. All sums so
paid and costs so incurred by Landlord, together with interest thereon at the
Default Rate

                                     - 20 -
<PAGE>   25

from the date Landlord makes such payment or incurs such cost, shall be payable
as Additional Charges to Landlord within thirty (30) days after receipt by
Tenant of a bill or statement therefor.

        24. SURRENDER OF PREMISES.

               (a) At the end of the Term or any renewal thereof or other sooner
termination of this Lease, Tenant will peaceably deliver to Landlord possession
of the Premises, together with all improvements or additions upon or belonging
to Landlord, by whomsoever made, in substantially the same condition as
received, or first installed, subject to the terms of Paragraphs 6, 21 and 40,
subject to normal wear and tear and the rights and obligations of Tenant
concerning casualty damage pursuant to Paragraph 20. Tenant may, upon the
termination of this Lease, remove all movable furniture and equipment belonging
to Tenant, at Tenant's sole cost, provided that Tenant repairs any damage caused
by such removal. Property not so removed by the Expiration Date (or in the event
of an earlier termination, within five (5) days of such earlier termination
date) shall be deemed abandoned by Tenant, and title to the same shall thereupon
pass to Landlord. Upon such expiration or sooner termination of the Term, Tenant
shall upon demand by Landlord, at Landlord's election either (i) at Tenant's
sole cost and expense, forthwith and with all due diligence remove any
Alterations made by or for the account of Tenant, designated by Landlord to be
removed (provided, however, that upon the written request of Tenant prior to
installation of such Alterations, Landlord shall advise Tenant at that time
whether or not such Alterations must be removed upon the expiration or sooner
termination of this Lease), and restore the Premises to its original condition
as of the Delivery Date, subject to the foregoing; or (ii) pay Landlord the
reasonable estimated cost thereof.

               (b) The voluntary or other surrender of this Lease by Tenant, or
a mutual cancellation thereof, shall not work a merger, and shall, at the option
of Landlord, terminate all or any existing subleases or subtenancies, or may, at
the option of Landlord, operate as an assignment to it of any or all such
subleases or subtenancies.

        25. WAIVER. If either Landlord or Tenant waives the performance of any
term, covenant or condition contained in this Lease, such waiver shall not be
deemed to be a waiver of any subsequent breach of the same or any other term,
covenant or condition contained herein. Furthermore, the acceptance of Rent or
Additional Charges by Landlord shall not constitute a waiver of any preceding
breach by Tenant of any tenor, covenant or condition of this Lease, regardless
of Landlord's knowledge of such preceding breach at the time Landlord accepted
such Monthly Base Rent or Additional Charges. Failure by Landlord to enforce any
of the terms, covenants or conditions of this Lease for any length of time shall
not be deemed to waive or to decrease the right of Landlord to insist thereafter
upon strict performance by Tenant. Waiver by Landlord of any term, covenant or
condition contained in this Lease may only be made by a written document signed
by Landlord.

        26. NOTICES. Except as otherwise expressly provided in this Lease, any
bills, statements, notices, demands, requests or other communications given or
required to be given under this Lease shall be effective only if rendered or
given in writing, sent by certified mail, return receipt requested, reputable
overnight carrier, or delivered personally, (i) to Tenant (A) at Tenant's
address set forth in the Basic Lease Information, if sent prior to Tenant's
taking possession of the Premises, or (B) at the Premises if sent subsequent to
Tenant's taking possession of the Premises, or (C) at any place where Tenant may
be found if sent subsequent to Tenant's vacating, deserting, abandoning or
surrendering the Premises; or (ii) to Landlord at Landlord's address set forth
in the Basic Lease Information; or (iii) to such other address as either
Landlord or Tenant may designate as its new address for such purpose by notice
given to the other in accordance with the provisions of this Paragraph 26. Any
such bill, statement, notice, demand, request or other communication shall be
deemed to have been rendered or given on the date the return receipt indicates
delivery of or refusal of delivery if sent by certified mail, the day upon which
recipient accepts and signs for delivery from a reputable overnight carrier, or
on the date a reputable overnight carrier indicates refusal of delivery, or upon
the date personal delivery is made. If Tenant is notified in writing of the
identity and address of any Mortgagee or ground or underlying lessor, Tenant
shall give to such Mortgagee or ground or underlying lessor notice of any
Default by Landlord under the terms of this Lease in writing sent by registered
or certified mail, and such Mortgagee or ground or underlying lessor shall be
given the opportunity to cure such Default (as defined in Paragraph 19(a)) prior
to Tenant exercising any remedy available to it.

                                     - 21 -
<PAGE>   26

        27. TAXES PAYABLE BY TENANT. Prior to delinquency Tenant shall pay all
taxes levied or assessed upon Tenant's equipment, furniture, fixtures and other
personal property located in or about the Premises. If the assessed value of
Landlord's property is increased by the inclusion therein of a value placed upon
Tenant's equipment, furniture, fixtures or other personal property, Tenant shall
pay to Landlord, upon written demand, the taxes so levied against Landlord, or
the proportion thereof resulting from said increase in assessment

        28. ABANDONMENT. Tenant shall not abandon the Premises and cease
performing its financial and maintenance obligations under this Lease at any
time during the Term, and if Tenant shall abandon and cease performing its
financial and maintenance obligations under this Lease, or surrender the
Premises or be dispossessed by process of law, or otherwise, any personal
property belonging to Tenant and left on the Premises shall, at the option of
Landlord, be deemed to be abandoned and title thereto shall thereupon pass to
Landlord. Notwithstanding anything to the contrary contained herein, Tenant
shall not be allowed to vacate the Premises for any period of time unless either
(a) such vacation would not result in a termination of, limitation on, or other
adverse effect on, Landlord's insurance policies, or (b) Tenant pays the
incremental premium costs, and assumes responsibility for any increased
deductible amounts, to the extent required to cause Landlord's insurance
policies to not be terminated, limited or adversely affected as a result of such
vacation. For purposes of this Paragraph 28, the Tenant shall not be deemed to
have abandoned the Premises solely because the Tenant is not occupying the
Premises.

        29. SUCCESSORS AND ASSIGNS. Subject to the provisions of Paragraph 9,
the terms, covenants and conditions contained herein shall be binding upon and
inure to the benefit of the parties hereto and their respective legal and
personal representatives, successors and assigns.

        30. ATTORNEY'S FEES. If Tenant or Landlord brings any action for any
relief against the other, declaratory or otherwise, arising out of this Lease,
including any suit by Landlord for the recovery of Rent or possession of the
Premises, the losing party shall pay to the prevailing party a reasonable sum
for attorney's fees and costs, which shall be deemed to have accrued on the
commencement of such action and shall be paid whether or not the action is
prosecuted to judgment.

        31. LIGHT AND AIR Tenant covenants and agrees that no diminution of
light, air or view by any structure which may hereafter be lawfully erected
(whether or not by Landlord) shall entitle Tenant to any reduction of rent under
this Lease, result in any liability of Landlord to Tenant, or in any other way
affect this Lease or Tenant's obligations hereunder. Landlord has informed
Tenant that it has no intention of constructing additional facilities at the
Project except those facilities needed to service the Project.

        32. SECURITY DEPOSIT. Concurrently with execution hereof, Tenant has
paid to Landlord the Security Deposit specified in the Basic Lease Information
as security for the fill and faithful performance of Tenant's obligations under
this Lease. If a default occurs under this Lease, or if Tenant is the subject of
an Insolvency Proceeding, Landlord may use the Security Deposit to remedy any
such default and to compensate Landlord for damages incurred. If Landlord uses
any portion of the Security Deposit to cure any default by Tenant hereunder,
Tenant shall deposit additional cash with Landlord in an amount equal to restore
the Security Deposit to its original amount within ten (10) days of notice from
Landlord; and Tenant's failure to do so shall become be a material breach of
this Lease. Landlord shall hold the Security Deposit for the foregoing purposes;
provided, however, that Landlord shall have no obligation to segregate the
Security Deposit from its general finds or to pay interest thereon. Within sixty
(60) days after the expiration of the Term or earlier termination, the Security
Deposit shall be returned to Tenant, reduced by those amounts that may be
required by Landlord to remedy defaults on the part of Tenant in the payment of
Rent, to repair damages to the Premises caused by Tenant and to clean the
Premises. If Landlord conveys or transfers its interest in the Leased Premises,
and as a part of such conveyance or transfer, assigns its interest in this Lease
and Security Deposit, or any portion thereof not previously applied, the
Security Deposit shall be transferred to Landlord's successor end Landlord shall
be released and discharged from any further liability to Tenant with respect to
such Security Deposit. In no event shall any mortgagee or beneficiary under a
mortgage or deed of trust encumbering all or any portion of the Project, or any
purchaser of all or any portion of the Project at a public or private
foreclosure sale under such mortgage or deed of trust, have any liability or
obligation whatsoever to Tenant or Tenant's successors or assigns for the return
of all or any part of the Security Deposit in the event any such mortgagee,
beneficiary or purchaser becomes a mortgagee in possession or succeeds

                                     - 22 -
<PAGE>   27

to the interest of Landlord under this Lease unless, and then only to the extent
that, such mortgagee, beneficiary or purchaser has received all or any part of
the Security Deposit.

        33. CORPORATE AUTHORITY; FINANCIAL INFORMATION. If Tenant signs as a
corporation each of the persons executing this Lease on behalf of Tenant does
hereby covenant and warrant that Tenant is a duly authorized and existing
corporation, that Tenant has and is qualified to do business in California, that
the corporation has full right and authority to enter into this Lease, and that
each and both of the persons signing on behalf of the corporation were
authorized to do so. If Tenant signs as a partnership or limited liability
company, each of the persons executing this Lease on behalf of Tenant does
hereby covenant and warrant that Tenant is a duly authorized and existing
partnership or limited liability company, as applicable, that Tenant has and is
qualified to do business in California, that Tenant has full right and authority
to enter into this Lease, and that each and both of the persons signing on
behalf of the Tenant were authorized to do so and by their signatures bind the
Tenant. Upon Landlord's request, Tenant shall provide Landlord with evidence
reasonably satisfactory to Landlord confirming the foregoing covenants and
warranties. Upon Landlord's request, Tenant shall provide Landlord with evidence
reasonably satisfactory to Landlord confirming the foregoing covenants and
warranties. Tenant hereby further covenants and warrants to Landlord that all
financial information and other descriptive information regarding Tenant's
business, which has been or shall be furnished to Landlord, is and shall be
accurate and complete at the time of delivery to Landlord. If Landlord signs as
a corporation each of the persons executing this Lease on behalf of Landlord
does hereby covenant and warrant that Landlord is a duly authorized and existing
corporation, that Landlord has and is qualified to do business in California,
that the corporation has full right and authority to enter into this Lease, and
that each and both of the persons signing on behalf of the corporation were
authorized to do so. Upon Tenant's request, Landlord shall provide Tenant with
evidence reasonably satisfactory to Tenant confirming the foregoing covenants
and warranties.

        34. PARKING. Tenant shall have the right to use, and Landlord shall
maintain for use by Tenant pursuant to the provisions of Paragraph 7, all of the
parking spaces located on the Project. Landlord agrees that so long as not
required by an applicable governmental entity, there shall be no additional
Monthly Base Rent charged for parking (not to be confused with the Expenses
charged pursuant to Paragraph 3).

        35. MISCELLANEOUS.

               (a) The term "Premises" wherever it appears herein includes and
shall be deemed or taken to include (except where such meaning would be clearly
repugnant to the context) the office space demised and improvements now or at
any time hereafter comprising or built in the space hereby demised. The
paragraph headings herein are for convenience of reference and shall in no way
define, increase, limit or describe the scope or intent of any provision of this
Lease. The term "Landlord" shall include Landlord and its successors and
assigns. In any case where this Lease is signed by more than one person, the
obligations hereunder shall be joint and several. The term "Tenant" or any
pronoun used in place thereof shall indicate and include the masculine or
feminine, the singular or plural number, individuals, firms or corporations, and
their and each of their respective successors, executors, administrators, and
permitted assigns, according to the context hereof.

               (b) Time is of the essence of this Lease and all of its
provisions. This Lease shall in all respects be governed by the laws of the
State of California. This Lease, together with its exhibits, contains all the
agreements of the parties hereto and supersedes any previous negotiations. There
have been no representations made by the Landlord or Tenant or understandings
made between the parties other than those set forth in this Lease and its
exhibits. This Lease may not be modified except by a written instrument by the
parties hereto.

               (c) If for any reason whatsoever any of the provisions hereof
shall be unenforceable or ineffective, all of the other provisions shall be and
remain in full force and effect.

               (d) Upon Tenant paying the Monthly Base Rent and Additional
Charges and performing all of Tenant's obligations under this Lease, Tenant
shall have quiet and peaceful enjoyment of the Premises during the Term as
against all persons or entities lawfully claiming by, through or under Landlord;
subject, however, to the provisions of this Lease.

                                     - 23 -
<PAGE>   28

        36. TENANT'S REMEDIES. If any default hereunder by Landlord is not cured
within the applicable cure period provided in Paragraph 19(b) (including any
Mortgagee's additional cure period), Tenant's exclusive remedies shall be (i) an
action for specific performance, or (ii) an action for actual damages. Tenant
shall look solely to Landlord's interest in the Project for the recovery of any
judgment from Landlord. Landlord, or if Landlord is a partnership its partners
whether general or limited, or if Landlord is a corporation its directors,
officers or shareholders, or if Landlord is a limited liability company its
members or managers, shall never be personally liable for any such judgment. Any
lien obtained to enforce such judgment and any levy of execution thereon shall
be subject and subordinate to any Mortgage (excluding any Mortgage which was
created as part of an effort to defraud creditors, i.e., a fraudulent
conveyance); provided, however that any such judgement and any such levy of
execution thereon shall not be subject or subordinated to any Mortgage that is
created or recorded in the official records of the county in which the Project
is located after the date of the judgement giving rise to such lien. Landlord's
interest in the Project shall include any insurance proceeds received by
Landlord which are not controlled by any Mortgagee or other lender. Tenant
hereby waives the benefit of any Laws granting it (A) the right to perform
Landlord's obligations, or (B) the right to terminate this Lease or withhold
Rent on account of any Landlord default, including, without limitation, Sections
1932(1), 1941 and 1942 of the California Civil Code.

        37. REAL ESTATE BROKERS. Each party represents that it has not had
dealings with any real estate broker, finder or other person with respect to
this Lease in any manner, except for any broker named in the Basic Lease
Information, whose fees or commission, if earned, shall be paid as provided in
the Basic Lease Information. Each party shall hold harmless the other party from
all damages resulting from any claims that may be asserted against the other
party by any other broker, finder or other person with whom the other party has
or purportedly has dealt.

        38. LEASE EFFECTIVE DATE. Submission of this instrument for examination
or signature by Tenant does not constitute a reservation of or option for lease,
and it is not effective as a lease or otherwise until execution and delivery by
both Landlord and Tenant.

        39. SIGNAGE. Tenant shall be allowed to use a monument sign near the
Project's entrance, and to install exterior signage and signage in the lobby of
the Building, subject to this Paragraph 39. Tenant shall be responsible for the
costs related to such signage. Such signage shall be subject to approval from
Landlord of the exact number, size, location and materials therefor (which
consent shall not be unreasonably withheld), approval from the City of Sunnyvale
and compliance with applicable governmental restrictions, including but not
limited to, ordinances of the City of Sunnyvale.

        40. HAZARDOUS SUBSTANCE LIABILITY. Tenant has received from Landlord a
copy of the Phase I Environmental Assessment of Two Office Buildings located at
1322 Crossman Avenue and 1341 Orleans Drive, Sunnyvale, California, dated August
7, 1997, prepared by McLaren Hart (the "Environmental Report").

               (a) DEFINITION OF HAZARDOUS SUBSTANCES. For the purpose of this
Lease, "Hazardous Substances" shall be defined, collectively, as oil, flammable
explosives, asbestos, radioactive materials, hazardous wastes, toxic or
contaminated substances or similar materials, including, without limitation, any
substances which are "hazardous substances," "hazardous wastes," "hazardous
materials" or "toxic substances" under applicable environmental laws, ordinance
or regulation.

               (b) TENANT INDEMNITY. Tenant releases Landlord from any liability
for, waives all claims against Landlord and shall indemnify, defend and hold
harmless Landlord, its employees, partners, agents, subsidiaries and affiliate
organizations against any and all claims, suits, loss, costs (including costs of
investigation, clean up, monitoring, restoration and reasonably attorney fees),
damage or liability, whether foreseeable or unforeseeable, by reason of property
damage (including diminution in the value of the property of Landlord), personal
injury or death directly arising from or related to Hazardous Substances
released, manufactured, discharged, disposed, used or stored on, in, or under
the Project or Premises during the Term by any Tenant Parties. The provisions of
this Tenant Indemnity regarding Hazardous Substances shall survive the
termination of the Lease.

                                     - 24 -
<PAGE>   29

               (c) LANDLORD INDEMNITY. Landlord releases Tenant from any
liability for, waives all claims against Tenant and shall indemnify, defend and
hold harmless Tenant, its officers, employees, and agents to the extent of
Landlord's interest in the Project, against any and all actions by any
governmental agency for clean up of Hazardous Substances on or under the
Project, including costs of legal proceedings, investigation, clean up,
monitoring, and restoration, including reasonable attorney fees, if, and to the
extent, arising from the presence of Hazardous Substances on, in or under the
Project or Premises as of the date of this Lease. The provisions of this
Landlord Indemnity regarding Hazardous Substances shall survive the termination
of the Lease.

Tenant's use of Hazardous Substances beyond very immaterial amounts of toxic
materials incidental to its office use (e.g., copier toner) shall be subject to
Landlord's prior written approval and shall comply with any applicable laws.

        41. SATELLITE ANTENNAE. During the Term of this Lease, Tenant shall have
the right, subject to relevant regulatory approvals and Landlord's consent (with
Landlord's consent not to be unreasonably withheld, conditioned or delayed), to
install satellite antennae ("Antennae") on the roof of the Building in a
location satisfactory to both Landlord and Tenant. Without otherwise limiting
the criteria upon which Landlord may withhold its consent to any proposed
Antennae, if Landlord withholds its consent due to concerns regarding the
appearance of the Antennae or the impact on structural aspects of the Building,
such withholding of consent shall be presumptively reasonable. Tenant shall not
be charged additional rent for roof space. Prior to submitting any plans to the
City of Sunnyvale or proceeding with any installation of the Antennae, Tenant
shall submit to Landlord elevations and specifications for the Antennae. Tenant
shall install the Antennae at its sole expense and shall be responsible for any
damage caused by the installation of the Antennae or related to the Antennae. At
the end of the Term, Tenant shall remove the Antennae from their locations and
repair any damage caused by such removal.

        42. OPTION TO RENEW. Upon condition that (i) no Default is continuing
under this Lease at the time of exercise or at the commencement of the option
term and (ii) Tenant continues to physically occupy the entire Premises, then
Tenant shall have the right to extend the Term for two (2) periods of five (5)
years each (each, an "Extension Term") following the initial Expiration Date or
the Expiration Date as extended by the first Extension Term, as applicable, by
giving written notice ("Exercise Notice") to Landlord at least eighteen (18)
months prior to the Expiration of the immediately preceding Tern.

        43. RENT DURING EXTENSION TERM. The initial Monthly Base Rent (subject
to Paragraph 3(b)) during each five (5) year Extension Term shall be the greater
of the Base Rent paid during the last month of the immediately preceding Tern or
the Fair Market Rental Value for the Premises as of the commencement of the
option term, as determined below:

               (a) Within thirty (30) days after receipt of Tenant's Exercise
Notice Landlord shall notify Tenant of Landlord's estimate of the Fair Market
Rental Value for the Premises, as determined below, for determining Monthly Base
Rent during the ensuing Extension Term; provided, however, if Tenant's Exercise
Notice is given more than eighteen (18) months before the Expiration Date,
Landlord's estimate of Fair Market Rental value may, but need not be given more
than eighteen (18) months before the Expiration Date. Within fifteen (15) days
after receipt of such notice from Landlord, Tenant shall notify Landlord in
writing that it (i) agrees with such rental rate or (ii) disagrees with such
rental rate. No response shall constitute agreement. In the event that Tenant
disagrees with Landlord's estimate of Fair Market Rental Value for the Premises,
then the parties shall meet and endeavor to agree within fifteen (15) days after
Landlord receives Tenant's notice described in the immediately preceding
sentence. If the parties cannot agree upon the Fair Market Rental Value within
said fifteen (15) day period, then the parties shall submit the matter to
binding appraisal in accordance with the following procedure except that in any
event neither party shall be obligated to start such procedure sooner than
eighteen (18) months before the expiration of the Lease Term. Within fifteen
(15) days of the conclusion of the period during which the two parties fail to
agree (but not sooner than eighteen (18) months before the expiration of the
Lease Term), the parties shall either (i) jointly appoint an appraiser for this
purpose or (ii) failing this joint action, each separately designate a
disinterested appraiser. No person shall be appointed or designated an appraiser
unless such person has at least five (5) years experience in appraising major
commercial property in Santa Clara County and is a member of a recognized
society of real estate appraisers. If within thirty (30) days after the
appointment, the two appraisers reach agreement on the Fair Market Rental Value
for the Premises, that value shall be binding and conclusive upon

                                     - 25 -
<PAGE>   30

the parties. If the two appraisers thus appointed cannot reach agreement on the
Fair Market Rental Value for the Premises within thirty (30) days after their
appointment, then the appraisers thus appointed shall appoint a third
disinterested appraiser having like qualifications within five (5) days. If
within thirty (30) days after the appointment of the third appraiser a majority
of the appraisers agree on the Fair Market Rental Value of the Premises, that
value shall be binding and conclusive upon the parties. If within thirty (30)
days after the appointment of the third appraiser a majority of the appraisers
cannot reach agreement on the Fair Market Rental Value for the Premises, then
the three appraisers shall each simultaneously submit their independent
appraisal to the parties, the appraisal farthest from the median of the three
appraisals shall be disregarded, and the mean average of the remaining two
appraisals shall be deemed to be the Fair Market Rental Value for the Premises
and shall be binding and conclusive upon the parties. Each party shall pay the
fees and expenses of the appraiser appointed by it and shall share equally the
fees and expenses of the third appraiser. If the two appraisers appointed by the
parties cannot agree on the appointment of the third appraiser, they or either
of them shall give notice of such failure to agree to the parties and if the
parties fail to agree upon the selection of such third appraiser within ten (10)
days after the appraisers appointed by the parties give such notice, then either
of the parties, upon notice to the other party, may request such appointment by
the American Arbitration Association or, on it failure, refusal or inability to
act, may apply for such appointment to the presiding judge of the Superior Court
of Santa Clara County, California.

               (b) Wherever used throughout this paragraph (Rent during
Extension Term) the term "Fair Market Rental Value" shall mean the fair market
rental value of the Premises, using as a guide the rate of monthly base rent
which would be charged during the Extension Term in the City of Sunnyvale and
adjacent cities for comparable high image, Class A office space in comparable
condition, of comparable quality, as of the time that the Extension Term
commences, with appropriate adjustments regarding taxes, insurance and operating
expenses as necessary to insure comparability to this Lease, as the case may be,
and also taking into consideration amount and type of parking, location, the
existence of any leasehold improvements (regardless of who paid for them and
with the assumption, for purposes of determining the Fair Market Rental Value,
that they are fully usable by Tenant), proposed term of lease, amount of space
leased, extent of service provided or to be provided, and any other relevant
terms or conditions (including consideration of whether or not the monthly base
rent is fixed).

               (c) In the event of a failure, refusal or inability of any
appraiser to act, his successor shall be appointed by the party who originally
appointed him, but in the case of the third appraiser, his successor shall be
appointed in the same manner as provided for appointment of the third appraiser.

               (d) The appraisers shall render their appraisals in writing with
counterpart copies to Landlord and Tenant. The appraisers shall have no power to
modify the provisions of this Lease.

               (e) To the extent that a binding appraisal has not been completed
prior to the expiration of any preceding period for which Monthly Base Rent has
been determined, Tenant shall pay Monthly Base Rent at the rate estimated by
Landlord, with an adjustment to be made once Fair Market Rental Value is
ultimately determined by binding appraisal. In no event shall any such
adjustment result in a decrease of the Monthly Base Rent for the Premises below
the amount payable by Tenant as of the period immediately preceding the ensuing
Extension Term.

                                     - 26 -
<PAGE>   31

               (f) From and after the commencement of the Extension Term, all of
the other terms, covenants and conditions of the Lease shall also apply;
provided, however, that during the second Extension Term Tenant shall have no
further rights to extend the Term.

        IN WITNESS WHEREOF, the parties hereto have executed this Lease as of
the date first above written.

                                   LANDLORD:

                                   CARIBBEAN/GENEVA INVESTORS,
                                   a California Limited Partnership

                                   By: /s/ JOHN MOZART
                                      ------------------------------------------
                                      John Mozart, Trustee of the Mozart
                                      Family Trust dated September 8, 1977
                                      Its: General Partner

                                   By: /s/ JOHN LOVEWELL
                                      ------------------------------------------
                                      John Lovewell
                                      Its: General Partner

                                   CROSSMAN PARTNERS, L.P.,
                                   a California Limited Partnership

                                   By: /s/ JOHN MOZART
                                      ------------------------------------------
                                      John Mozart, Trustee of the Mozart
                                      Family Trust dated September 8, 1977
                                      Its: General Partner

                                   TENANT:

                                   HARMONIC, INC.,
                                   a Delaware corporation

                                   By: /s/ ANTHONY J. LEY
                                      ------------------------------------------
                                      ANTHONY J. LEY
                                      ------------------------------------------
                                      Its: PRESIDENT
                                          --------------------------------------

                                   By: /s/ ROBIN N. DICKSON
                                      ------------------------------------------
                                      ROBIN N. DICKSON
                                      ------------------------------------------
                                      Its: CHIEF FINANCIAL OFFICER
                                          --------------------------------------

                                     - 27 -
<PAGE>   32

                                   EXHIBIT "A"

                                    PREMISES

                            [See attached Site Plan]

                                     - 1 -
<PAGE>   33

                                   BUILDING C

                               52,325 +/- Sq.Ft.

                                   [SITE PLAN]

<PAGE>   34

                                   EXHIBIT "B"

                          LEGAL DESCRIPTION OF THE LAND

REAL PROPERTY in the City of Sunnyvale, County of Santa Clara, State of
California, described as follows:

Parcel 6, as shown on that certain Map entitled which was filed for record in
the Office of the Recorder of the County of Santa Clara, State of California on
July 18, 1978 in Book 423 of Maps, page(s) 13.

APN: 110-36-003
ARB: 10-04-23.02.02 (23.02, 23)

                                     - 1 -
<PAGE>   35

                                   EXHIBIT "C"

              DECLARATION OF COVENANTS, CONDITIONS AND RESTRICTIONS

                                     - 1 -
<PAGE>   36

        2. So long as Tenant is not in default (beyond any period given Tenant
to cure such default) in the payment of rent or additional rent or in the
performance of any material term, covenant or condition of the Lease on Tenant's
part to the performed, (a) Tenant's possession of the Demised Premises and
Tenant's rights and privileges under the Lease, or any extensions or renewals
thereof or acquisition of additional space which may be effected in accordance
with any option therefor in the Lease, shall not be diminished or interfered
with by Mortgagee in the exercise of any of its rights under the Mortgage, and
(b) Mortgagee will not join Tenant as a party defendant in any action or
proceeding for the purposes of terminating Tenant's interest and estate under
the Lease because of any default under the Mortgage, however Mortgagee may join
Tenant as a party defendant in any action or proceeding to enforce the Mortgage
or any other instrument given as security for the loan to Landlord, if such is
done only for purposes of procedure and required completeness and not for the
purposes of canceling the Lease or Tenant's rights under such Lease.

        3. In the event any proceedings are brought for the foreclosure of the
Mortgage, or if the Mortgaged Property be sold pursuant to a trustee's sale
under the Mortgage or if the Mortgagee becomes owner of the Mortgaged Property
by acceptance of a deed or assignment in lieu of foreclosure or otherwise,
Tenant shall attorn to the purchaser or Mortgagee, as the case may be, upon any
such foreclosure sale or trustee's sale or acceptance by Mortgagee of a deed or
assignment in lieu of foreclosure and Tenant shall recognize such purchaser or
Mortgagee, as the case may be, as the landlord under the Lease. Such attornment
shall be effective and self-operative without the execution of any further
instrument on the part of any of the parties hereto. Tenant agrees, however, to
execute and deliver at any time and from time to time, upon the request of
Landlord or of any holder(s) of any of the indebtedness or other obligations
secured by the Mortgage or any such purchaser, any instrument or certificate
which, in the reasonable judgment of Landlord or of such holder(s) or such
purchaser, may be necessary or appropriate in any such foreclosure proceeding or
otherwise to evidence such attornment.

        4. If Mortgagee shall succeed to the interest of Landlord under the
Lease in any manner, or if any purchaser acquires the Demised Premises upon any
foreclosure of the Mortgage or any trustee's sale under the Mortgage, Mortgagee
or such purchaser, as the case may be, in the event of attornment shall have the
same remedies by entry, action or otherwise in the event of any default by
Tenant (beyond any period given Tenant to cure such default) in the payment of
rent or additional rent or in the performance of any of the terms, covenants and
conditions of the Lease on Tenant's part to be performed that Landlord had or
would have had if Mortgagee or such purchaser had not succeeded to the interest
of Landlord. From and after any such attornment, Mortgagee or such purchaser
shall be bound to Tenant under all the terms, covenants, and conditions of the
Lease, and Tenant shall, from and after the succession to the interest of
Landlord under the Lease by Mortgagee or such purchaser, have the same remedies
against Mortgagee or such purchaser for the breach of an agreement contained in
the Lease that Tenant might have had under the Lease against Landlord if
Mortgagee or such purchaser had not succeeded to the interest of Landlord;
provided, however, the Mortgagee or such purchaser shall not be:

               (a) liable for any act or omission of any prior landlord
(including Landlord); or

               (b) subject to any offsets or defenses which Tenant might have
against any prior landlord (including Landlord); or

                                     - 2 -
<PAGE>   37

               (c) bound by any rent or additional rent which Tenant might have
paid for more than the current month to any prior landlord (including Landlord).

        5. Nothing herein contained is intended, nor shall it be construed, to
abridge or adversely affect any right or remedy of Landlord under the Lease in
the event of any default by Tenant (beyond any period given Tenant to cure such
default) in the payment of rent or additional rent or in the performance of any
of the terms, covenants or conditions of the Lease on Tenant's part to be
performed.

        6. This Agreement and the Lease may not be amended or modified orally or
in any manner other than by an agreement in writing signed by the parties hereto
or their respective successors in interest. This Agreement shall inure to the
benefit of and be binding upon the parties hereto, their successors and assigns,
and any purchaser or purchasers at foreclosure of the Mortgaged Property, and
their respective heirs, personal representatives, successors and assigns.

        7. To the extent that the Lease shall entitle the Tenant to notice of
any mortgage, and/or the address of the Mortgagee, this Agreement shall
constitute such notice to the Tenant with respect to the Mortgage and to the
address of the Mortgagee.

        IN WITNESS WHEREOF, the parties hereto have hereunto caused this
Agreement to be duly executed as of the day and year first above written.

                            TENANT:

                            NAME

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

                            MORTGAGEE:

                            GENERAL AMERICAN LIFE INSURANCE COMPANY

                            By:
                               -------------------------------------------------
                               Title:   Vice President/Authorized Representative
                               Address: 700 Market Street
                                        St. Louis, Missouri 63101

                                     - 3 -
<PAGE>   38
                                 D 511 PAGE 396

                                                           5947371
                                                 RECORDED AT THE REQUEST OF
                                              Title Insurance and Trust Company
                                                      MAR 8 1978 801AM
                                                  George A. Mann, Recorder
                                            SANTA CLARA COUNTY, OFFICIAL RECORDS

               When recorded mail to:

               Prudential Insurance Co.
               155 Moffett Park Drive
               Bldg. A
               Suite 101
               Sunnyvale, CA
               Attn: Lee Cashion

                      DECLARATION OF PROTECTIVE COVENANTS
                         MOFFETT INDUSTRIAL PARK NO. 5

                                    6227353

     THIS DECLARATION, made this March 1, 1978 9:00 by THE PRUDENTIAL INSURANCE
COMPANY OF AMERICA (hereinafter called Prudential), a New Jersey Corporation,

                              W I T N E S S E T H
                              - - - - - - - - - -

     WHEREAS Prudential is the owner of that certain real property located in
the City of Sunnyvale, County of Santa Clara, State of California, described in
Exhibit "A" (hereinafter called Moffett Industrial Park No. 5), and           .

     WHEREAS Prudential proposes to subdivide Moffett Industrial Park No. 5 and
to subject it to the following restrictions:

     NOW, THEREFORE, Prudential hereby declares that Moffett Industrial Park
No. 5 is and shall be held, conveyed, encumbered, leased and used subject to
the following uniform restrictions, covenants and equitable servitudes in
furtherance of a plan for the subdivision, improvement and sale thereof and to
enhance the value, desirability and attractiveness of Moffett Industrial Park
No. 5, the restrictions set forth herein shall run with the real property
included within Moffett Industrial Park No. 5 shall be binding upon all persons
having or acquiring any interest in such real property or any part thereof,
shall inure to the benefit of every portion of Moffett Industrial Park No. 5
and any interest therein and shall inure to the benefit of and be binding upon
each successor in interest of Prudential and may be enforced by Prudential or
its successors in interest or by any Owner (as defined in Article 1 below) or
his successors in interest.

I.   GENERAL PROVISIONS.

     A.   Definitions.

          1.   "Architectural Control Committee" means Prudential, or any
               committee which Prudential may appoint by an appropriate
               instrument recorded with the Santa Clara County Recorder.

          2.   "Lot" means each lot shown on the parcel or subdivision cap,
               or cape for Moffett Industrial Park No. 5.

          3.   "Site" means a parcel consisting either of a Lot, a portion of
               a Lot, contiguous Lots, or portions of contiguous Lots.

          4.   "Improvements" means all improvements to a Site including, but
               without limitation, buildings loading areas, trackage, parking
               areas, pavement, poles, fences landscaping, signs and structures
               of any type.

          5.   "Building" means the main portion of any building or similar
               structure and all projections or extensions thereof, including
               garages, outside platforms and docks.

          6.   "Owner" means the person or persons, partnership or corporation
               in when title to a Site is vested, as shown by the official
               records of the Office of the County Recorder of Santa Clara
               County, "Owner" does not mean mortgages, trustees and
               beneficiaries of deeds of trust or holders of any indebtedness
               secured by a mortgage or deed of trust.

     B.   Purposes of Restrictions.

          The purpose of these covenants, conditions and restrictions is to
          insure proper development and use of Moffett Industrial Park No. 5, to
          protect the Owner of each Site against such improper development and
          use of other Sites as will depreciate the value of his Site, to
          prevent the erection of structure of unsuitable

      THIS DOCUMENT IS BEING RE-RECORDED TO CORRECT THE LEGAL DESCRIPTION
<PAGE>   39
or inharmonious design or construction, to secure and maintain sufficient
setbacks from streets and between structures, to maintain Comcon Landscaping (as
defined in Article V) and in general to provide for a high quality of
improvement of Moffett Industrial Park No. 5 in accordance with a general plan.

II.  REGULATION OF IMPROVEMENTS.

     A.   Minimum Setback Lines.

          No Improvement shall be constructed upon any Site within fifty (50)
          feet of the right-of-way line of any public street. No Improvement
          other than landscaping, paving and fences shall be constructed upon
          any Site within twenty (20) feet of any other Site. The Architectural
          Control Committee may approve lesser setback lines if in its opinion a
          variation would be compatible with the general development of Moffett
          Industrial Park No. 5.

     B.   Ground Coverage.

          No more than forty-five percent (45%) of the surface of any Site
          shall be covered with a Building or Buildings.

     C.   Construction Operations.

          Construction of all Improvements shall be expedited so that none shall
          remain in a partially finished condition any longer than reasonably
          necessary for the completion thereof.

     D.   Excavation.

          No excavation shall be made on, and no sand, gravel or soil shall be
          removed from, any Site, except in connection with the construction of
          Improvements, and upon completion thereof, exposed openings shall be
          backfilled, and disturbed ground shall be graded, leveled and paved or
          landscaped.

     E.   Landscaping.

          Within ninety (90) days of the occupancy or completion of any Building
          on a Site, whichever occurs first, such Site shall be landscaped in
          accordance with plans approved by the Architectural Control Committee.
          The Owner of the Site shall maintain such landscaping in good order
          and condition.

     F.   Signs.

          No billboard or advertising signs shall be permitted on any Site other
          than those approved by the Architectural Control Committee which
          identify the name, business and products of the person or firm
          occupying the Site or offer the Site for sale or lease.

     G.   Parking Areas.

          Each Site shall have facilities for parking sufficient to serve the
          business conducted thereon without using adjacent streets thereof, and
          no use shall be made of any Site which would require parking in excess
          of the parking spaces on the Site. In any event, the number and size
          of the parking spaces on each Site shall conform with all ordinances
          of the City of Sunnyvale applicable with respect thereto. Parking
          areas shall be laid out and constructed according to plans approved by
          the Architectural Control Committee and shall be maintained thereafter
          in good condition. Except with the approval of the Architectural
          Control Committee no parking shall be permitted within fifty (50) feet
          of the right-of-way line of any street or between any Building and any
          street.

     H.   Loading Areas.

          All vehicle loading and unloading in connection with an Owner's
          business shall be conducted upon his Site, and sufficient space shall
          be provided therefor. Loading Areas shall be screened from view from
          streets and adjoining properties by a visual barrier not less than six
          (6) feet in height. Except with the prior written approval of the
          Architectural Control Committee, loading areas shall not be located
          between any Building and any street or any closer than seventy-five
          (75) feet to the right-of-way line of any street.

                                      -2-
<PAGE>   40
     I.   Storage Areas.

          No materials, supplies, equipment or trash containers shall be stored
          on a Site except inside a Building, or behind a visual barrier not
          less than six (6) feet in height or rising two (2) feet above the
          stored materials, supplies or equipment, whichever is higher,
          screening such storage areas from view from streets and adjoining
          Sites. Except with the prior written approval of the Architectural
          Control Committee, storage areas shall not be located between any
          Building and any street.

     J.   Building Regulations.

          All Buildings shall be constructed and maintained in accordance with
          the following standards unless an exception is approved in writing by
          the Architectural Control Committee:

          1.   Exterior walls shall be of masonry, concrete or approved equal
               material.

          2.   Exterior walls shall be painted or otherwise finished in a manner
               acceptable to the Architectural Control Committee. Exterior walls
               shall not be repainted or refinished unless and until the
               Architectural Control Committee shall have approved the color or
               refinishing materials to be used.

          3.   All Buildings shall be maintained in good order and repair and
               condition. All exterior painted surfaces shall be maintained in
               first-class condition and shall be repainted at least once every
               five (5) years.

          4.   All electrical, telephone and other utility lines shall be
               underground and shall not be exposed on the exterior of any
               Building.

          5.   All electrical and mechanical apparatus, equipment, fixtures
               (other than lighting fixtures) conduit, ducts, vents, flues and
               pipes located on the exterior of any Building shall be concealed
               from view and shall be architecturally treated in a manner
               acceptable to the Architectural Control Committee.

III. APPROVAL OF PLANS.

     No Improvement shall be erected, placed, altered, maintained or permitted
     to remain on any Site until plans and specifications showing plot layout
     and all exterior elevations, with materials and colors therefor and
     structural design, signs and landscaping shall have been submitted to and
     approved in writing by the Architectural Control Committee.  Such plans and
     specifications shall be submitted in writing over the signature of the
     Owner of the Site or his authorized agent. Approval shall be based, among
     other things, on adequacy of Site dimensions; adequacy of structural
     design; effect of location and use of improvements on neighboring Sites;
     improvement operations, and uses; relation of topography, grade, and
     finished ground elevation of the Site being improved to that of neighboring
     Sites; proper facing of main elevation with respect to nearby streets; and
     conformity of the plans and specifications to the purpose and general plan
     and intent of this Declaration. The Architectural Control Committee shall
     not arbitrarily or unreasonably withhold its approval of such plans and
     specifications. If the Architectural Control Committee fails either to
     approve or disapprove such plans and specifications with thirty (30) days
     after the same have been submitted to it, it shall be conclusively presumed
     that the Architectural Control Committee has approved said plans and
     specifications, subject, however, to the restrictions contained in Article
     II and IV hereof.

     Neither the Architectural Control Committee nor its successors or assigns
     shall be liable in damages to anyone submitting plans to them for approval,
     or to any Owner by reason of mistake in judgment, negligence, or
     nonfeasance arising out of or in connection with the approval or
     disapproval or failure to approve any such plans. Every person who submits
     plans to the Architectural Control Committee for approval agrees, by
     submission of such plans, and every Owner agrees, by acquiring title to a
     Site, that he will not bring any action or suit against the Architectural
     Control Committee to recover any such damages.

                                      -3-
<PAGE>   41
     Notwithstanding anything to the contrary contained herein, after the
     expiration of one (1) year from the date of issuance of a building permit
     by municipal or other governmental authority for any improvement, said
     improvement shall, in favor of purchasers and encumbrances in good faith
     and for value, be deemed to be in compliance with all provisions of this
     Article III, unless actual notice of such noncompliance or noncompletion,
     executed by the Architectural Control Committee, shall appear of record in
     the Office of the Recorder of Santa Clara County, California, or unless
     legal proceedings shall have been instituted to enforce compliance or
     completion.

IV.  REGULATION OF OPERATIONS AND USES.

     A.   Permitted Operations and Uses.

          Except as provided in paragraphs B and C below, any industrial use
          will be permitted on a Site including, but without limitation,
          manufacturing, processing, storage, wholesale, office, laboratory,
          professional and research and development. Such retail uses as may be
          required for the convenience of Owners and their employees shall be
          permitted and such retail uses may include, but without limitation,
          restaurants, drug stores, barber and beauty shops, shoe repair shops,
          cleaners, hotels, post offices, banks and automobile service stations.
          Such municipal, governmental and public utility uses as may be
          necessary or appropriate shall be permitted.

     B.   Prohibited Operations and Uses.

          No Site shall be used as a junk yard, stock yard, or slaughter yard or
          for commercial excavation of building or construction materials, fat
          rendering or distillation of bones, dumping, disposal, incineration or
          reduction of garbage, sewage, offal, dead animals or refuse, or the
          smelting of iron, tin, zinc or other ores or the prospecting, or
          drilling for natural gas, oil or like substances, except with the
          prior written permission of the Architectural Control Committee, and
          then only in such manner as will not materially inconvenience other
          Owners or materially depreciate the value of adjacent property.

     C.   Nuisance.

          No noxious or offensive activity shall be carried on nor shall
          anything be done on any Site which may be or become an annoyance or
          nuisance to the Owners or occupants of other Sites or which will be
          offensive by reason of odor, fumes, dust, dirt, fly-ash, smoke, noise,
          glare or which will be hazardous by reason of danger of fire or
          explosion.

V.   COMMON LANDSCAPING.

     The Owner of each Site shall maintain landscaping existing thereon at the
     time of purchase ("Common Landscaping") in a condition that meets the
     approval of the Architectural Control Committee. In the event that the
     Owner of any Site does not maintain Common Landscaping in such condition or
     the landscaping described in Article II E as therein provided, Prudential
     or its agents shall have the right to maintain such landscaping in such
     condition. Prudential or its Agents shall have the right at any reasonable
     time to enter into any Site for the purpose of such maintenance and for
     such other purposes as are reasonably related thereto. Prudential shall use
     due diligence and reasonable care in repairing, maintaining and installing
     Common Landscaping to see that such repair, maintenance and installation
     does not interfere with the Owner's use of its Site. In the event that
     Prudential or its Agents should undertake any such maintenance on any such
     Site, the Owner thereof shall reimburse Prudential for all of Prudential's
     costs incurred in such maintenance. In any legal proceeding brought by
     Prudential to recover such costs, the Owner shall be obligated to pay for
     the costs and expenses of such proceeding, including reasonable attorneys'
     fees.

VI.  ENFORCEMENT.

     A.  Interpretation.

         In case of uncertainty as to the meaning of any article, section,
         subsection, paragraph, sentence, clause, phrase or word of this
         Declaration the interpretation of Prudential shall be final, conclusive
         and binding upon all interested parties.

                                      -4-
<PAGE>   42
       B. Abatement and Suit.

          Violation or breach of any restriction herein contained shall give to
          Prudential and every Owner the right to enter the property upon or as
          to which said violation or breach exists and to summarily abate and
          remove at the expense of the Owner thereof, any structure, thing or
          condition that may be or exist thereon contrary to the intent and
          meaning of the provision hereof, or to prosecute a proceeding at law
          or in equity against the person or persons who have violated or are
          attempting to violate any of these restrictions to enjoin or prevent
          them from doing so, to cause said violation to be remedied or to
          recover damages for said violation.

          In any legal or equitable proceeding for the enforcement of this
          Declaration the losing party or parties shall pay the attorneys' fees
          of the prevailing party or parties, in such amount as may be fixed by
          the court in such proceedings. All remedies provided herein or at law
          or in equity shall be cumulative and not exclusive.

       C. Inspection.

          Prudential may from time to time at any reasonable hour or hours,
          enter and inspect any property subject to these restrictions to
          ascertain compliance therewith.

       D. Failure to Enforce Not a Waiver of Rights.

          Except as provided in the last paragraph of Article III hereof, the
          failure of Prudential or any Owner to enforce any restriction
          contained herein shall in no event be deemed to be a waiver of the
          right to do so thereafter nor of the right to enforce any other
          restriction contained herein.

VII.   EXTINGUISHMENT, CONTINUATION AND MODIFICATION.

       This Declaration, every provision hereof and every covenant, condition
       and restriction contained herein shall continue in full force and effect
       for a period of forty (40) years from the date hereof; provided, however,
       that this Declaration, or any provision hereof, or any covenant,
       condition or restriction contained herein, may be terminated, extended,
       modified, or amended with the written consent of the Owners of sixty-five
       percent (65%) of the land in Moffett Industrial Park No. 5 (exclusive of
       portions thereof now or hereafter dedicated to public use); provided,
       further, that so long as Prudential owns at least twenty percent (20%) of
       Moffett Industrial Park No. 5, no such termination, extension,
       modification or amendment shall be effective without the written consent
       of Prudential. No such termination, extension, modification or amendment
       shall be effective until a proper instrument in writing has been executed
       and acknowledged and recorded in the Office of the Recorder of Santa
       Clara County, California.

VIII.  MOFFETT INDUSTRIAL PARK NO. 5 OWNERS ASSOCIATION.

       A. Membership.

          Each Owner shall be a member of the Moffett Industrial Park No. 5
          Owners Association, an unincorporated association (hereinafter called
          the "Association").

       B. Transfer of Rights and Duties.

          The rights and duties of Prudential under this Declaration shall be
          transferred to and automatically assured by the Association upon the
          earliest of the following to occur:

          1. The sale of ninety percent (90%) of Moffett Industrial Park No. 5
             by Prudential to Owners as evidenced by the official records of the
             Santa Clara County Recorder; or

          2. The recordation by Prudential of an appropriate instrument with the
             Santa Clara County Recorder transferring the rights and duties of
             Prudential under this Declaration to the Association.

                                      -5-

<PAGE>   43
     c.   Organization.

          The members of the Association may at any time meet and adopt by-laws
          or rules of procedure to govern the operation of the Association.
          Until such by-laws or rules of procedures are adopted, meetings of the
          Association may be called by any member thereof upon seven (7) days'
          written notice to each member setting forth the time and place
          thereof, provided that notice may be waived in writing at any time by
          any member or members not so notified; twenty-five percent (25%) of
          the members of the Association shall constitute a quorum; and the
          Association may set by a vote of a majority of its members present at
          a meeting, duly called, at which a quorum is present or without a
          meeting by unanimous written consent of its members.

IX.  ASSIGNABILITY OF PRUDENTIAL'S RIGHTS AND DUTIES.

     Any and all of the rights, powers and reservations of Prudential herein
     contained may be assigned to any person, corporation or entity which
     assumes in writing the duties of Prudential pertaining to the particular
     rights, powers and reservations assigned, and thereafter to the extent of
     such assignment, such person, corporation or entity shall have the same
     rights and powers and be subject to the same obligations and duties as are
     herein given to and assumed by Prudential.

X.   CONSTRUCTIVE NOTICE AND ACCEPTANCE.

     Every Owner is and shall be conclusively deemed to have consented and
     agreed to every covenant, condition and restriction contained herein,
     whether or not any reference to this Declaration is contained in the
     instrument by which such Owner acquired an interest in any portion of
     Moffett Industrial Park No. 5.

     IN WITNESS WHEREOF, Prudential, the declarent herein, has caused its name
     to be hereunto subscribed as of the day and year first above written.

                                   THE PRUDENTIAL INSURANCE COMPANY OF AMERICA

                                   By:     /s/ L.R. CASHION
                                      -----------------------------------------
       RECORDER'S MEMO                  L.R. Cashion, General Manager
        [ILLEGIBLE]

STATE OF CALIFORNIA    )            On this 1st day of December in the year one
COUNTY OF SANTA CLARA  )            thousand nine hundred and 78, before me,
                                    Matthew Nicoll, a Notary Public, State of
                                    California, duly commissioned and sworn,
                                    personally appeared  L.R. Cashion known to
                                    me to be the General Manager of the
                                    corporation described in and that executed
                                    the within instrument and also known to me
                                    to be the person who executed the within
                                    instrument on behalf of the corporation
                                    therein named and acknowledged to me that
                                    such corporation executed the same

                                    IN WITNESS WHEREOF I have hereunto set my
                                    hand and affixed my official seal in the
                                    said County of Santa Clara the day and year
                                    in this certificate ???? above written.

          OFFICIAL SEAL
    [SEAL WORDING ILLEGIBLE]                             MATTHEW NICOLL
                                              ---------------------------------
                                              Notary Public State of California

<PAGE>   44
                                  EXHIBIT "A"

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

All of Parcels 1, A and B, as shown upon that certain map entitled, "Parcel Map
being a resubdivision of Parcel 7 as shown on map recorded in Book 214 of Maps
at Page 23 Santa Clara County Records", which map was filed for record in the
office of the recorder of the County of Santa Clara, State of California on
March 1, 1978 in Book 413 of Maps at page 54.

All of Parcel 5, as shown upon that certain map entitled, "Parcel Map being a
resubdivision of Parcel 6 as shown on map recorded in Book 214 of maps at page
23 Santa Clara County records", which map was filed for record in the office of
the recorder of the County of Santa Clara, State of California, on March 1,
1978 in Book 413 of Maps, at page 53.

<PAGE>   45
                           RECORDED AT THE REQUEST OF
                         TITLE INSURANCE AND TRUST CO.

                               DEC 12 1978 2:01AM

                            GEORGE A. MANN, Recorder
                      Santa Clara County, Official Records
<PAGE>   46
                                  [FLOOR PLAN]

                               1322 CROSSMAN AVE.
                       52,325 (plus or minus) SQUARE FEET
<PAGE>   47

                                   EXHIBIT "D"

                              RULES AND REGULATIONS

        1. Sidewalks, halls, passages, exits, entrances, elevators, escalators
and stairways shall not be obstructed by Tenant or used by Tenant for any
purpose other than for ingress to and egress from the Premises. Tenant, and
Tenant's employees or invitees, shall not go upon the roof of the Building,
except as authorized by Landlord or as expressly set forth in the Lease.

        2. Except as expressly permitted in the Lease, no sign, placard,
picture, name, advertisement or notice visible from the exterior of the Premises
shall be inscribed, painted, affixed, installed or otherwise displayed by Tenant
on any part of the Building without the prior written consent of Landlord, and
Landlord shall have the right to remove any such sign, placard, picture, name,
advertisement or notice without notice to and at the expense of Tenant.

                If Landlord shall have given consent relating to a sign to
Tenant at any time, whether before or after the execution of the Lease, such
consent shall not in any way operate as a waiver or release of any of the
provisions hereof or of the Lease, and shall be deemed to relate only to the
particular sign, placard, picture, name, advertisement or notice so consented to
by Landlord and shall not be construed as dispensing with the necessity of
obtaining the specific written consent of Landlord with respect to any other
such sign, placard, picture, name, advertisement or notice. All approved signs
or lettering on doors and walls shall be printed, painted, affixed or inscribed
at the expense of Tenant.

        3. No curtains, draperies, blinds, shutters, shades, screens or other
coverings, awnings, hangings or decorations shall be attached to, hung or placed
in, or used in connection with, any window, door or patio on the Premises
without the prior written consent of Landlord. In any event with the prior
written consent of Landlord, all such items shall be installed inboard of
Landlord's window coverings and shall not in any way be visible from the
exterior of the Building. No articles shall be placed or kept on the window
sills so as to be visible from the exterior of the Building. No articles shall
be placed against glass partitions or doors which might appear unsightly from
outside the Building.

        4. Tenant shall see that the doors of the Premises are closed and
securely locked and must observe strict care and caution that all water faucets
or water apparatus are entirely shut off before Tenant or its employees leave
such Premises, and that all utilities shall likewise be carefully shut off, so
as to prevent waste or damage, and for any default or carelessness the Tenant
shall make good all injuries sustained by other tenants or occupants of the
Building or Landlord.

        5. [Intentionally deleted]

        6. Tenant shall have the right to install its own security system for
the Premises so long as Tenant shall furnish Landlord with a key or other access
device for any such lock.

        7. If Tenant shall alter any lock or access device or install a new or
additional lock or access device, Tenant shall in each case furnish Landlord
with a key for any such lock. Tenant, upon the termination of the tenancy, shall
deliver to Landlord all the keys or access devices for the Building, offices,
rooms and toilet rooms which shall have been furnished to Tenant or which Tenant
shall have had made. In the event of the loss of any keys or access devices so
furnished by Landlord, Tenant shall pay Landlord therefor.

        8. The toilet rooms, toilets, urinals, wash bowls and other apparatus
shall not be used for any purpose other than that for which they were
constructed and no foreign substance of any kind whatsoever shall be thrown
therein, and the expense of any breakage, stoppage or damage resulting from the
violation of this rule by Tenant or Tenant's employees or invitees shall be
borne by Tenant.

                                      -2-
<PAGE>   48

        9. Tenant shall not use or keep in the Premises or the Building any
kerosene, gasoline or inflammable or combustible fluid or material other than
limited quantities necessary for the operation or maintenance of office or
office equipment. Tenant shall not use any method of heating or air conditioning
other than supplied pursuant to the Lease.

        10. Tenant shall not use, keep or permit to be used or kept in the
Premises any foul or noxious gas or substance or permit or suffer the Premises
to be occupied or used in a manner offensive or objectionable to Landlord by
reason of noise, odors and/or vibrations or interfere in any way with anyone
having business in the Project, nor shall any animals or birds be brought or
kept in or about the Premises or the Building.

        11. Except with the prior written consent of Landlord, Tenant shall not
sell, or permit the sale, at retail, of newspapers, magazines, periodicals,
theater tickets or any other goods or merchandise in or on the Premises, nor
shall Tenant carry on, or permit or allow any employee or other person to carry
on, the business of stenography, typewriting or any similar business in or from
the Premises for the service or accommodation of occupants of any other portion
of the Building other than as set forth in Tenant's permitted use herein, nor
shall the Premises be used for the storage of merchandise or for manufacturing
of any kind, or the business of a public barber shop or beauty parlor, nor shall
the Premises be used for any improper, immoral or objectionable purpose, or any
business or activity other than that specifically provided for in the Lease.

        12. Except for Tenant's right to install Antennae pursuant to the Lease,
Tenant shall not install any radio or television antenna, loudspeaker or any
other device on the exterior walls or the roof of the Building. Tenant shall not
interfere with radio or television broadcasting or reception from or in the
Building or elsewhere.

        13. Tenant shall not lay linoleum, tile, carpet or any other floor
covering so that the same shall be affixed to the floor of the Premises in any
manner except as approved in writing by Landlord. The expense of repairing any
damage resulting from a violation of this rule by Tenant or Tenant's
contractors, employees or invitees or the removal of any floor covering shall be
borne by Tenant. Tenant shall use chair pads if needed to avoid excess wear and
tear to the floor coverings.

        14. Landlord shall have the right to prescribe the weight, size, and
position of all safes, furniture or other heavy equipment brought into the
Building. Safes or other heavy objects shall, if considered necessary by
Landlord, stand on wood strips of such thickness as determined by Landlord to be
necessary to properly distribute the weight thereof. Landlord will not be
responsible for loss of or damage to any such safe, equipment or property from
any cause, and all damage done to the Building by moving or maintaining any such
safe, equipment or other property shall be repaired at the expense of Tenant.

                Business machines and mechanical equipment belonging to Tenant
which cause noise or vibration that may be transmitted to the structure of the
Building or to any space therein to such a degree as to be objectionable to
Landlord or to any tenants in the Building shall be placed and maintained by
Tenant, at Tenant's expense, on vibration eliminators or other devices
sufficient to eliminate noise or vibration. The persons employed to move such
equipment in or out of the Building must be reasonably acceptable to Landlord.

        15. Tenant shall not place a load upon any floor of the Premises which
exceeds the load per square foot which such floor was designed to carry and
which is allowed by law. Tenant shall not mark, use double-sided adhesive tape
on, or drive nails, screw or drill into, the partitions, woodwork or plaster or
in any way deface the Premises or any part thereof. Tenant may hang pictures on
walls in the Premises. Any damage to the walls caused by molley bolts, or like
hanging materials, will be repaired by Tenant.

        16. Tenant shall not install, maintain or operate upon the Premises any
vending machine other than those for the exclusive use of Tenant's or it
subtenant's employees without the written consent of Landlord.

        17. There shall not be used in any space, or in the public areas of the
Building, either by Tenant or others, any hand trucks except those equipped with
rubber tires and side guards or such other material-handling

                                      -3-
<PAGE>   49

equipment as Landlord may approve. No other vehicles of any kind shall be
brought by Tenant into or kept in or about the Premises.

        18. Tenant shall store all trash and garbage within the interior of the
Premises. No material shall be placed in the trash boxes or receptacles if such
material is of such nature that it may not be disposed of in the ordinary and
customary manner of removing and disposing of trash and garbage in the
jurisdiction in which the Premises is located, without violation of any law or
ordinance governing such disposal.

        19. Canvassing, soliciting, distribution of handbills or any other
written material and peddling in the Building are prohibited, and Tenant shall
cooperate to prevent the same.

        20. Landlord shall have the right to change the name and address of the
Building, subject to providing reasonable notice to Tenant.

        21. Landlord reserves the right to exclude or expel from the Building
any person who, in Landlord's judgment, is intoxicated or under the influence of
liquor or drugs or who is in excessive violation of any of the rules or
regulations of the Building. Excessive violation shall mean that Tenant has been
provided with repeated notice of such violation and such violation is continued.

        22. Without the prior written consent of Landlord, Tenant shall not use
the name of the Building in connection with or in promoting or advertising the
business of Tenant except as Tenant's address. Tenant may use Project's name on
its stationery and business cards.

        23. Tenant shall comply with all safety, fire protection and evacuation
procedures and regulations established by Landlord or any governmental agency.

        24. Tenant assumes any and all responsibility for protecting the
Premises from theft, robbery and pilferage, which includes keeping doors locked
and other means of entry to the Premises closed.

        25. Landlord reserves the right to make such other and reasonable,
uniformly applied and nondiscriminatory enforced rules and regulations as in its
judgment may from time to time be needed for safety and security, for care and
cleanliness of the Building and for the preservation of good order therein.
Tenant agrees to abide by all such Rules and Regulations hereinafter stated and
any additional rules and regulations which are adopted. No new Rule or
Regulation shall be designed to discriminate solely against Tenant.

        26. Tenant shall be responsible for the observance of all of the
foregoing Rules and Regulations by Tenant's employees, agents, clients,
customers, invitees and guests.

        27. Unless otherwise defined, terms used in these Rules and Regulations
shall have the same meaning as in the Lease.

        28. In the event of a conflict between the Lease and the Rules and
Regulations, then the Lease shall control.

                                      -4-
<PAGE>   50

                                   EXHIBIT "E"

                       FORM OF TENANT ESTOPPEL CERTIFICATE

                                           Date: ______  _________________, 2000

Conning Asset Management Company,
As authorized lender representative
700 Market Street
St. Louis, Missouri 63101
                                       Re: Loan No. ______ - Application No. ___
C/O CONNING ASSET MANAGEMENT,              Lease dated _________________ between
ITS AUTHORIZED REPRESENTATIVE              _____________________________________
2682 BISHOP DRIVE, SUITE 209               ____________________ Lessor/Landlord,
SAN RAMON, CA 94583                        and _________________________________
                                           ______________________ Lessee/Tenant,
                                           on premises located and addressed as
                                           _____________________________________

Gentlemen:

The undersigned, as Lessee/Tenant, hereby confirms and represents to you the
following:

        1. That it has accepted possession of the premises demised pursuant to
           the terms of the aforesaid lease.

        2. That the building(s), improvements and space required to be furnished
           according to the aforesaid lease have been satisfactorily completed
           in all respects.

        3. That the Lessor/Landlord has fulfilled all of its duties of an
           inducement nature, and is not in default in any manner in the
           performance of any of the terms, covenants or provisions of said
           lease.

        4. That the aforesaid lease has not been modified, altered or amended
           except by agreement dated __________.

        5. That there are no offsets or credits against rentals, nor have
           rentals been prepaid, except as provided by the lease terms.

        6. That said rentals commence to accrue on the ___ day of ________, 20_.
           The primary lease term expires on ________, 20__. The fixed monthly
           rental is $_____.

        7. That we have no notice of an assignment, hypothecation or pledge of
           rents or the lease, except to your Company.

        8. WE CERTIFY THAT THE ATTACHED LEASE IS A TRUE AND COMPLETE CONY OF THE
           LEASE AND HAS NOT BEEN MODIFIED, ALTERED AND/OR AMENDED EXCEPT AS
           DESCRIBED ABOVE.

                                      -1-
<PAGE>   51

The above statements are made upon the understanding that your Company will rely
on them in connection with the making of a loan collaterally secured by an
assignment of our lease, and that these statements are true to the best of our
knowledge and belief.

                               Sincerely,
                                            By:
                                               ---------------------------------
                                                               (authorized rep.)

                                      -2-

<PAGE>   52

                                   EXHIBIT "F"

         FORM OF SUBORDINATION, NONDISTURBANCE AND ATTORNMENT AGREEMENT

                         SUBORDINATION, NON-DISTURBANCE
                            AND ATTORNMENT AGREEMENT

        THIS AGREEMENT made this ____ day of _________________ , ______ between
GENERAL AMERICAN LIFE INSURANCE COMPANY (hereinafter called "Mortgagee") and
______________________________________________________________________________
(hereinafter called "Tenant").

                                  WITNESSETH:

                                    RECITALS

        A. Mortgagee is now the owner and holder of a Deed of Trust (hereinafter
called the "Mortgage") dated ____________________________ , covering the real
property described in Exhibit "A" attached hereto and made a part hereof and the
buildings and improvements thereon (hereinafter collectively called the
"Mortgaged Property") securing the payment of a promissory note in the stated
principal amount of $ ____________ payable to the order of Mortgagee.

        B. Tenant is the holder of a leasehold estate pursuant to a lease
(hereinafter called the "Lease") dated _______________________________ , with
____________________ as landlord (said landlord and its successors and assigns
occupying the position of landlord under the Lease hereinafter called
"Landlord"), covering the Mortgaged Property (hereinafter called the "Demised
Premises").

        C. Tenant and Mortgagee desire to confirm their understanding with
respect to the Lease and the Mortgage.

                                   AGREEMENTS

        NOW, THEREFORE, in consideration of the mutual covenants and agreements
herein contained, Mortgagee and Tenant hereby agree and covenant as follows:

        1. The Lease now is, and shall at all times continue to be, subject and
subordinate in each and every respect, to the Mortgage and to any and all liens,
interests and rights created thereby and to any and all increases, renewals,
modifications, extensions, substitutions, replacements and/or consolidations of
the Mortgage, provided that any and all such increases, renewals, modifications,
extensions, substitutions, replacements and/or consolidations shall nevertheless
be subject to the terms of this Agreement.

                                      -1-<PAGE>   1
                                                                   EXHIBIT 10.28

                                      LEASE

                              DATED APRIL 18, 2000

                                 BY AND BETWEEN

                               AMB PROPERTY, L.P.
                                   as Landlord

                                       and

                                 HARMONIC, INC.
                                    as Tenant

                      AFFECTING PREMISES COMMONLY KNOWN AS

                               646 CARIBBEAN DRIVE
                              SUNNYVALE, CALIFORNIA

<PAGE>   2

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                       Page
                                                                       ----
<S>                                                                    <C>
1.     Basic Provisions                                                  1
       1.1   Parties                                                     1
       1.2   Premises                                                    1
       1.3   Term                                                        1
       1.4   Base Rent                                                   1
       1.5   Tenant's Share of Operating Expenses                        1
       1.6   Tenant's Estimated Monthly Rent Payment                     1
       1.7   Security Deposit                                            1
       1.8   Permitted Use                                               1
       1.9   Guarantor                                                   1
       1.10  Addenda and Exhibits                                        1
       1.11  Address for Rent Payments                                   1
2.     Premises, Parking and Common Areas                                2
       2.1   Letting                                                     2
       2.2   Common Areas - Definition                                   2
       2.3   Common Areas - Tenant's Rights                              2
       2.4   Common Areas - Rules and Regulations                        2
       2.5   Common Area Changes                                         2
3.     Term                                                              2
       3.1   Term                                                        2
       3.2   Delay in Possession                                         2
       3.3   Commencement Date Certificate                               2
4.     Rent                                                              2
       4.1   Base Rent                                                   2
       4.2   Operating Expenses                                          3
5.     Security Deposit                                                  3
6.     Use                                                               4
       6.1   Permitted Use                                               4
       6.2   Hazardous Substances                                        4
       6.3   Tenant's Compliance with Requirements                       5
       6.4   Inspection: Compliance with Law                             5
7.     Maintenance, Repairs, Trade Fixtures and Alterations              5
       7.1   Tenant's Obligations                                        5
       7.2   Landlord's Obligations                                      6
       7.3   Alterations                                                 6
       7.4   Surrender/Restoration                                       6
8.     Insurance; Indemnity                                              6
       8.1   Payment of Premiums                                         7
       8.2   Tenant's Insurance                                          7
       8.3   Landlord's Insurance                                        7
       8.4   Waiver of Subrogation                                       7
       8.5   Indemnity                                                   7
       8.6   Exemption of Landlord from Liability                        8
9.     Damage or Destruction                                             8
       9.1   Termination Right                                           8
       9.2   Damage Caused by Tenant                                     8
10.    Real Property Taxes                                               8
       10.1  Payment of Real Property Taxes                              8
       10.2  Real Property Tax Definition                                9
       10.3  Additional Improvements                                     9
       10.4  Joint Assessment                                            9
       10.5  Tenant's Property Taxes                                     9
11.    Utilities                                                         9
12.    Assignment and Subletting                                         9
       12.1  Landlord's Consent Required                                 9
       12.2  Rent Adjustment                                             9
13.    Default; Remedies                                                 9
       13.1  Default                                                    10
       13.2  Remedies                                                   10
       13.3  Late Charges                                               10
</TABLE>

                                       i

<PAGE>   3

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                       Page
                                                                       ----
<S>                                                                    <C>
14.    Condemnation                                                     10
15.    Estoppel Certificate and Financial Statements                    11
       15.1  Estoppel Certificate                                       11
       15.2  Financial Statement                                        11
16.    Additional Covenants and Provisions                              11
       16.1  Severability                                               11
       16.2  Interest on Past-Due Obligations                           11
       16.3  Time of Essence                                            11
       16.4  Landlord Liability                                         11
       16.5  No Prior or Other Agreements                               11
       16.6  Notice Requirements                                        11
       16.7  Date of Notice                                             11
       16.8  Waivers                                                    12
       16.9  Holdover                                                   12
       16.10 Cumulative Remedies                                        12
       16.11 Binding Effect; Choice of Law                              12
       16.12 Landlord                                                   12
       16.13 Attorneys' Fees and Other Costs                            12
       16.14 Landlord's Access: Showing Premises; Repairs               12
       16.15 Signs                                                      12
       16.16 Termination: Merger                                        12
       16.17 Quiet Possession                                           12
       16.18 Subordination: Attornment; Non-Disturbance                 13
       16.19 Rules and Regulations                                      13
       16.20 Security Measures                                          13
       16.21 Reservations                                               13
       16.22 Conflict                                                   13
       16.23 Offer                                                      13
       16.24 Amendments                                                 13
       16.25 Multiple Parties                                           14
       16.26 Authority                                                  14
Signatures                                                              14
</TABLE>

EXHIBIT A
EXHIBIT B
           Not Applicable
           Not Applicable
           Not Applicable
           Not Applicable
EXHIBIT G
           Not Applicable
EXHIBIT I

                                       ii

<PAGE>   4

                            AMB PROPERTY CORPORATION
                          INDUSTRIAL MULTI-TENANT LEASE

1. BASIC PROVISIONS ("Basic Provisions").

        1.1 Parties: This Lease ("Lease") dated April 18, 2000, is made by and
between AMB PROPERTY, L.P., a Delaware limited partnership, ("Landlord") and
HARMONIC, INC., a Delaware corporation ("Tenant") (collectively the "Parties,"
or individually a "Party").

        1.2 Premises: The area consisting of 88,320 square feet of leasable area
as outlined on Exhibit A attached hereto ("Premises"), of the building
("Building") located at 646 Caribbean Drive in the City of Sunnyvale, State of
California. The Building is located in the industrial center commonly known as
MBC/Moffett Business Center (the "Industrial Center"). Tenant shall have
non-exclusive rights to the Common Areas (as defined in Paragraph 2.3 below),
but shall not have any rights to the roof, exterior walls or utility raceways of
the Building or to any other buildings in the Industrial Center. The Premises,
the Building, the Common Areas, the land upon which they are located and all
other buildings and improvements thereon are herein collectively referred to as
the "Industrial Center."

        1.3 Term: Ten (10) years and Zero (0) months ("Term") commencing
September 8, 2000 ("Commencement Date") and ending September 30, 2010
("Expiration Date").

        1.4 Base Rent: $176,640.00 per month ("Base Rent"). $176,640.00 payable
on execution of this Lease for THE FIRST FULL MONTH OF RENT.

        1.5 Tenant's Share of Operating Expenses ("Tenant's Share"):

<TABLE>
<S>                                                   <C>
            (a) Industrial Center                     30.94%
            (b) Building                                100%
</TABLE>

        1.6 Tenant's Estimated Monthly Rent Payment: Following is the estimated
monthly Rent payment to Landlord pursuant to the provisions of this Lease. This
estimate is made at the inception of the Lease and is subject to adjustment
pursuant to the provisions of this Lease:

<TABLE>
<S>                                                    <C>
            (a) Base Rent (Paragraph 4.1)              $176,640.00
            (b) Operating Expenses (Paragraph 4.2;
                  excluding Real Property Taxes,
                Landlord Insurance)                    $  5,833.00
            (c) Landlord Insurance (Paragraph 8.3)     $    567.00
            (d) Real Property Taxes (Paragraph 10)     $  7,238.00

                   Estimated Monthly Payment                    $190,278.00
</TABLE>

        1.7 Security Deposit: $264,960.00 ("Security Deposit").

        1.8 Permitted Use ("Permitted Use") Research and development,
manufacturing, storage and distribution, offices and marketing and other legal
related uses.

        1.9 Guarantor: N/A

        1.10 Addenda and Exhibits: Attached hereto are the following Addenda and
Exhibits, all of which constitute a part of this Lease:

                (a) Addenda:  First Addendum to Lease

                (b) Exhibits: Exhibit A: Diagram of Premises.
                              Exhibit B: Commencement Date Certificate.
                              Exhibit C:
                              Exhibit D:
                              Exhibit E:
                              Exhibit F:
                              Exhibit G: Hazardous Materials Questionnaire.
                              Exhibit H:
                              Exhibit I: Rules and Regulations.

        1.11 Address for Rent Payments: All amounts payable by Tenant to
Landlord shall until further notice from Landlord be paid to AMB PROPERTY L.
P./MBC MOFFETT BUSINESS CENTER, C/O ORCHARD PROPERTIES at the following address:

                                File No.: 3750789034
                                P.O. Box 840349
                                Dallas, TX 75284-0349

<PAGE>   5

2. PREMISES, PARKING AND COMMON AREAS.

        2.1 Letting. Landlord hereby leases to Tenant and Tenant hereby leases
from Landlord the Premises upon all of the terms, covenants and conditions set
forth in this Lease. Any statement of square footage set forth in this Lease or
that may have been used in calculating Base Rent and/or Operating Expenses is an
approximation which Landlord and Tenant agree is reasonable and the Base Rent
and Tenant's Share based thereon is not subject to revision whether or not the
actual square footage is more or less.

        2.2 Common Areas - Definition. "Common Areas" are all areas and
facilities outside the Premises and within the exterior boundary line of the
Industrial Center and interior utility raceways within the Premises that are
provided and designated by the Landlord from time to time for the general
non-exclusive use of Landlord, Tenant and other tenants of the Industrial Center
and their respective employees, suppliers, shippers, tenants, contractors and
invitees.

        2.3 Common Areas - Tenant's Rights. Landlord hereby grants to Tenant,
for the benefit of Tenant and its employees, suppliers, shippers, contractors,
customers and invitees, during the term of this Lease, the non-exclusive right
to use, in common with others entitled to such use, the Common Areas as they
exist from time to time, subject to any rights, powers, and privileges reserved
by Landlord under the terms hereof or under the terms of any rules and
regulations or covenants, conditions and restrictions governing the use of the
Industrial Center.

        2.4 Common Areas - Rules and Regulations. Landlord shall have the
exclusive control and management of the Common Areas and shall have the right,
from time to time, to establish, modify, amend and enforce reasonable Rules and
Regulations with respect thereto in accordance with Paragraph 16.19.

        2.5 Common Area Chances. Landlord shall have the right, in Landlord's
sole discretion, from time to time:

                (a) To make changes to the Common Areas, including, without
limitation, changes in the locations, size, shape and number of driveways,
entrances, parking spaces, parking areas, loading and unloading areas, ingress,
egress, direction of traffic, landscaped areas, walkways and utility raceways;

                (b) To close temporarily any of the Common Areas for maintenance
purposes so long as reasonable access to the Premises remains available;

                (c) To designate other land outside the boundaries of the
Industrial Center to be a part of the Common Areas;

                (d) To add additional buildings and improvements to the Common
Areas;

                (e) To use the Common Areas while engaged in making additional
improvements, repairs or alterations to the Industrial Center, or any portion
thereof and

                (f) To do and perform such other acts and make such other
changes in, to or with respect to the Common Areas and Industrial Center as
Landlord may, in the exercise of sound business judgment, deem to be
appropriate.

3. TERM.

        3.1 Term. The Commencement Date, Expiration Date and Term of this Lease
are as specified in Paragraph 1.3.

        3.2 Delay in Possession. If for any reason Landlord cannot deliver
possession of the Premises to Tenant by the Commencement Date, Landlord shall
not be subject to any liability therefor, nor shall such failure affect the
validity of this Lease or the obligations of Tenant hereunder. In such case,
Tenant shall not, except as otherwise provided herein, be obligated to pay Rent
or perform any other obligation of Tenant under the terms of this Lease until
Landlord delivers possession of the Premises to Tenant. The term of the Lease
shall commence 30 days following notice to Tenant that Landlord is prepared to
tender possession of the Premises to Tenant. If possession of the Premises is
not delivered to Tenant within 120 days after the Commencement Date and such
delay is not due to Tenant's acts, failure to act or omissions Tenant may by
notice in writing to Landlord within 10 days after the end of said 120 day
period cancel this Lease and the parties shall be discharged from all
obligations hereunder. If such written notice of Tenant is not received by
Landlord within said 10 day period, Tenant's right to cancel this Lease shall
terminate.

        3.3 Commencement Date Certificate. At the request of Landlord, Tenant
shall execute and deliver to Landlord a completed certificate ("Commencement
Date Certificate") in the form attached hereto as Exhibit B.

4. RENT.

        4.1 Base Rent. Tenant shall pay to Landlord Base Rent and other monetary
obligations of Tenant to Landlord under the terms of this Lease (such other
monetary obligations are herein referred to as "Additional Rent") in lawful
money of the United States, without offset or deduction, in advance on or before
the first day of each month. Base Rent and Additional Rent for any period during
the term hereof which is for less than one full month shall be prorated based
upon the actual number of days of the month involved. Payment of

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<PAGE>   6

Base Rent and Additional Rent shall be made to Landlord at its address stated
herein or to such other persons or at such other addresses as Landlord may from
time to time designate in writing to Tenant. Base Rent and Additional Rent are
collectively referred to as "Rent". All monetary obligations of Tenant to
Landlord under the terms of this Lease are deemed to be rent.

        4.2 Operating Expenses. Tenant shall pay to Landlord on the first day of
each month during the term hereof, in addition to the Base Rent, Tenant's Share
of all Operating Expenses in accordance with the following provisions:

                (a) "Operating Expenses" are all costs incurred by Landlord
relating to the ownership, management and operation of the Industrial Center,
Building and Premises including, but not limited to, the following:

                        (i) The management, operation, repair, maintenance and
replacement in neat, clean, good order and condition of the Common Areas,
including parking areas, loading and unloading areas, trash areas, roadways,
sidewalks, walkways, parkways, driveways, landscaped areas, striping, bumpers,
irrigation systems, drainage systems, lighting facilities, fences and gates,
exterior signs and tenant directories.

                        (ii) Water, gas, electricity, telephone and other
utilities servicing the Common Areas.

                        (iii) Trash disposal, janitorial services, snow removal,
property management and security services.

                        (iv) Reserves set aside for maintenance, repair and
replacement of the Common Areas and Building.

                        (v) Real Property Taxes.

                        (vi) Premiums for the insurance policies maintained by
Landlord under Paragraph 8 hereof.

                        (vii) Environmental monitoring and insurance programs.

                        (viii) Monthly amortization of capital improvements to
the Common Areas and the Building. The monthly amortization of any given capital
improvement shall be the sum of the (i) quotient obtained by dividing the cost
of the capital improvement by Landlord's estimate of the number of months of
useful life of such improvement plus (ii) an amount equal to the cost of the
capital improvement times 1/12 of the lesser of 12% or the maximum annual
interest rate permitted by law.

                        (ix) Maintenance of the Building including, but not
limited to, painting, caulking and repair and replacement of Building
components, including, but not limited to, roof, elevators and fire detection
and sprinkler systems.

                        (x) If Tenant fails to maintain the Premises, any
expense incurred by Landlord for such maintenance.

                (b) Tenant's Share of Operating Expenses that are not
specifically attributed to the Premises or Building ("Common Area Operating
Expenses") shall be that percentage shown in Paragraph 1.5(a). Tenant's Share of
Operating Expenses that are attributable to the Building ("Building Operating
Expenses") shall be that percentage shown in Paragraph 1.5(b). Landlord in its
sole discretion shall determine which Operating Expenses are Common Area
Operating Expenses, Building Operating Expenses or expenses to be entirely borne
by Tenant.

                (c) The inclusion of the improvements, facilities and services
set forth in Subparagraph 4.2(a) shall not be deemed to impose any obligation
upon Landlord to either have said improvements or facilities or to provide those
services.

                (d) Tenant shall pay monthly in advance on the same day as the
Base Rent is due Tenant's Share of estimated Operating Expenses in the amount
set forth in Paragraph 1.6. Landlord shall deliver to Tenant within 90 days
after the expiration of each calendar year a reasonably detailed statement
showing Tenant's Share of the actual Operating Expenses incurred during the
preceding year. If Tenant's estimated payments under this Paragraph 4(d) during
the preceding year exceed Tenant's Share as indicated on said statement, Tenant
shall be credited the amount of such overpayment against Tenant's Share of
Operating Expenses next becoming due. If Tenant's estimated payments under this
Paragraph 4.2(d) during said preceding year were less than Tenant's Share as
indicated on said statement, Tenant shall pay to Landlord the amount of the
deficiency within 30 days after delivery by Landlord to Tenant of said
statement. At any time Landlord may adjust the amount of the estimated Tenant's
Share of Operating Expenses to reflect Landlord's estimate of such expenses for
the year.

5. SECURITY DEPOSIT. Tenant shall deposit with Landlord prior to Commencement
Date or Early Occupancy the Security Deposit set forth in Paragraph 1.7 as
security for Tenant's faithful performance of Tenant's obligations under this
Lease. If Tenant fails to pay Base Rent or Additional Rent or otherwise defaults
under this Lease (as defined in Paragraph 13.1), Landlord may use the Security
Deposit for the payment of any amount due Landlord or to reimburse or compensate
Landlord for any liability, cost, expense, loss or damage (including attorney's
fees) which Landlord may suffer or incur by reason thereof. Tenant shall on
demand

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<PAGE>   7

pay Landlord the amount so used or applied so as to restore the Security Deposit
to the amount set forth in Paragraph 1.7. Landlord shall not be required to keep
all or any part of the Security Deposit separate from its general accounts.
Landlord shall, at the expiration or earlier termination of the term hereof and
after Tenant has vacated the Premises, return to Tenant that portion of the
Security Deposit not used or applied by Landlord. No part of the Security
Deposit shall be considered to be held in trust, to bear interest, or to be
prepayment for any monies to be paid by Tenant under this Lease.

6. USE.

        6.1 Permitted Use. Tenant shall use and occupy the Premises only for the
Permitted Use set forth in Paragraph 1.8. Tenant shall not commit any nuisance,
permit the emission of any objectionable noise or odor, suffer any waste, make
any use of the Premises which is contrary to any law or ordinance or which will
invalidate or increase the premiums for any of Landlord's insurance. Tenant
shall not service, maintain or repair vehicles on the Premises, Building or
Common Areas. Tenant shall not store foods, pallets, drums or any other
materials outside the Premises.

        6.2 Hazardous Substances.

                (a) Reportable Uses Require Consent. The term "Hazardous
Substance" as used in this Lease shall mean any product, substance, chemical,
material or waste whose presence, nature, quantity and/or intensity of
existence, use, manufacture, disposal, transportation, spill, release or effect,
either by itself or in combination with other materials expected to be on the
Premises, is either: (i) potentially injurious to the public health, safety or
welfare, the environment, or the Premises; (ii) regulated or monitored by any
governmental authority; or (iii) a basis for potential liability of Landlord to
any governmental agency or third party under any applicable statute or common
law theory. Hazardous Substance shall include, but not be limited to,
hydrocarbons, petroleum, gasoline, crude oil or any products or byproducts
thereof. Tenant shall not engage in any activity in or about the Premises which
constitutes a Reportable Use (as hereinafter defined) of Hazardous Substances
without the express prior written consent of Landlord and compliance in a timely
manner (at Tenant's sole cost and expense) with all Applicable Requirements (as
defined in Paragraph 6.3). "Reportable Use" shall mean (i) the installation or
use of any above or below ground storage tank, (ii) the generation, possession,
storage, use, transportation, or disposal of a Hazardous Substance that requires
a permit from, or with respect to which a report, notice, registration or
business plan is required to be filed with, any governmental authority, and
(iii) the presence in, on or about the Premises of a Hazardous Substance with
respect to which any Applicable Requirements require that a notice be given to
persons entering or occupying the Premises or neighboring properties.
Notwithstanding the foregoing, Tenant may, without Landlord's prior consent, but
upon notice to Landlord and in compliance with all Applicable Requirements, use
any ordinary and customary materials reasonably required to be used by Tenant in
the normal course of the Permitted Use, so long as such use is not a Reportable
Use and does not expose the Premises, or neighboring properties to any
meaningful risk of contamination or damage or expose Landlord to any liability
therefor. In addition, Landlord may (but without any obligation to do so)
condition its consent to any Reportable Use of any Hazardous Substance by Tenant
upon Tenant's giving Landlord such additional assurances as Landlord, in its
reasonable discretion, deems necessary to protect itself, the public, the
Premises and the environment against damage, contamination or injury and/or
liability therefor, including but not limited to the installation (and, at
Landlord's option, removal on or before Lease expiration or earlier termination)
of reasonably necessary protective modifications to the Premises (such as
concrete encasements) and/or the deposit of an additional Security Deposit.

                (b) Duty to Inform Landlord. If Tenant knows, or has reasonable
cause to believe, that a Hazardous Substance is located in, under or about the
Premises or the Building, Tenant shall immediately give Landlord written notice
thereof, together with a copy of any statement, report, notice, registration,
application, permit, business plan, license, claim, action, or proceeding given
to, or received from, any governmental authority or private party concerning the
presence, spill, release, discharge of, or exposure to, such Hazardous
Substance. Tenant shall not cause or permit any Hazardous Substance to be
spilled or released in, on, under or about the Premises (including, without
limitation, through the plumbing or sanitary sewer system).

                (c) Indemnification by Tenant. Tenant shall indemnify, protect,
defend and hold Landlord, Landlord's affiliates, Lenders, and the officers,
directors, shareholders, partners, employees, managers, independent contractors,
attorneys and agents of the foregoing ("Landlord Entities") and the Premises,
harmless from and against any and all damages, liabilities, judgments, costs,
claims, liens, expenses, penalties, loss of permits and attorneys' and
consultants' fees arising out of or involving any Hazardous Substance brought
onto the Premises by or for Tenant or by any of Tenant's employees, agents,
contractors or invitees. Tenant's obligations under this Paragraph 6.2(c) shall
include, but not be limited to, the effects

                                       4
<PAGE>   8

of any contamination or injury to person, property or the environment created or
suffered by Tenant, and the cost of investigation (including consultants' and
attorneys' fees and testing), removal, remediation, restoration and/or abatement
thereof, or of any contamination therein involved. Tenant's obligations under
this Paragraph 6.2(c) shall survive the expiration or earlier termination of
this Lease.

                (D). LANDLORD'S REPRESENTATION REGARDING HAZARDOUS MATERIALS.
LANDLORD HEREBY MAKES THE FOLLOWING REPRESENTATIONS TO TENANT AS OF THE
EFFECTIVE DATE WITHOUT HAVING MADE ANY INVESTIGATION THEREOF (AND WITHOUT BEING
REQUIRED TO MAKE OR BEING DEEMED TO HAVE MADE ANY SUCH INVESTIGATION) TO VERIFY
THE ACCURACY THEREOF AND IS SUBJECT TO AND QUALIFIED BY ALL INFORMATION AND
DISCLOSURES MADE TO TENANT BY LANDLORD. TO THE BEST OF THE LANDLORD'S KNOWLEDGE:

                        1. THE SOIL AND GROUNDWATER ON OR UNDER THE PROJECT DOES
NOT CONTAIN HAZARDOUS MATERIALS IN AMOUNTS WHICH VIOLATE ANY HAZARDOUS MATERIALS
LAWS TO THE EXTENT THAT ANY GOVERNMENTAL ENTITY COULD REQUIRE EITHER LANDLORD OR
TENANT TO TAKE ANY REMEDIAL ACTION WITH RESPECT TO SUCH HAZARDOUS MATERIALS.

                        2. DURING THE TIME THAT LANDLORD HAS OWNED THE PROJECT,
LANDLORD HAS RECEIVED NO WRITTEN NOTICE OF: (I) ANY VIOLATION, OR ALLEGED
VIOLATION, OF ANY HAZARDOUS MATERIALS LAW WITH RESPECT TO THE PROJECT THAT HAS
NOT BEEN REMEDIATED TO THE EXTENT THAT NO OTHER REMEDIATION IS THEN LEGALLY
REQUIRED BY APPLICABLE LAW; (II) ANY PENDING CLAIMS RELATING TO THE PRESENCE OF
HAZARDOUS MATERIALS ON THE PROJECT; OR, (III) ANY PENDING INVESTIGATION BY ANY
GOVERNMENTAL AGENCY CONCERNING THE PROJECT RELATING TO HAZARDOUS MATERIALS.

        6.3 Tenant's Compliance with Requirements. Tenant shall, at Tenant's
sole cost and expense, fully, diligently and in a timely manner, comply with all
"Applicable Requirements," which term is used in this Lease to mean all laws,
rules, regulations, ordinances, directives, covenants, easements and
restrictions of record, permits, the requirements of any applicable fire
insurance underwriter or rating bureau, and the reasonable recommendations of
Landlord's engineers and/or consultants, relating in any manner to the Premises
(including but not limited to matters pertaining to (i) industrial hygiene, (ii)
environmental conditions on, in, under or about the Premises, including soil and
groundwater conditions, and (iii) the use, generation, manufacture, production,
installation, maintenance, removal, transportation, storage, spill or release of
any Hazardous Substance), now in effect or which may hereafter come into effect.
Tenant shall, within 5 days after receipt of Landlord's written request, provide
Landlord with copies of all documents and information evidencing Tenant's
compliance with any Applicable Requirements and shall immediately upon receipt,
notify Landlord in writing (with copies of any documents involved) of any
threatened or actual claim, notice, citation, warning, complaint or report
pertaining to or involving failure by Tenant or the Premises to comply with any
Applicable Requirements.

        6.4 Inspection: Compliance with Law. In addition to Landlord's
environmental monitoring and insurance program, the cost of which is included in
Operating Expenses, Landlord and the holders of any mortgages, deeds of trust or
ground leases on the Premises ("Lenders") shall have the right to enter the
Premises at any time in the case of an emergency, and otherwise at reasonable
times PROVIDED LANDLORD HAS PROVIDED TWENTY-FOUR (24) HOUR NOTICE TO TENANT, for
the purpose of inspecting the condition of the Premises and for verifying
compliance by Tenant with this Lease and all Applicable Requirements. Landlord
shall be entitled to employ experts and/or consultants in connection therewith
to advise Landlord with respect to Tenant's installation, operation, use,
monitoring, maintenance, or removal of any Hazardous Substance on or from the
Premises. The cost and expenses of any such inspections shall be paid by the
party requesting same unless a violation of Applicable Requirements exists or is
imminent or the inspection is requested or ordered by a governmental authority.
In such case, Tenant shall upon request reimburse Landlord or Landlord's Lender,
as the case may be, for the costs and expenses of such inspections.

7. MAINTENANCE, REPAIRS, TRADE FIXTURES AND ALTERATIONS.

        7.1 Tenant's Obligations. Subject to the provisions of Paragraph 7.2
(Landlord's Obligations), Paragraph 9 (Damage or Destruction) and Paragraph 14
(Condemnation), Tenant shall, at Tenant's sole cost and expense and at all
times, keep the Premises and every part thereof in good order, condition and
repair (whether or not such portion of the Premises requiring repair, or the
means of repairing the same, are reasonable or readily accessible to Tenant and
whether or not the need for such repairs occurs as a result of Tenant's use, any
prior use, the elements or the age of such portion of the Premises) including,
without limiting the generality of the foregoing, all equipment or facilities
specifically serving the Premises, such as plumbing, heating, air conditioning,
ventilating, electrical, lighting facilities, boilers, fired or unfired pressure
vessels, fire hose connectors if within the Premises, fixtures, interior walls,
interior surfaces of exterior walls, ceilings, floors, windows, doors, plate
glass, and skylights, but excluding any items which are the responsibility of
Landlord pursuant to Paragraph 7.2 I

                                       5
<PAGE>   9

below. Tenant's obligations shall include restorations, replacements or renewals
when necessary to keep the Premises and all improvements thereon or a part
thereof in good order, condition and state of repair.

        7.2 Landlord's Obligations. Subject to the provisions of Paragraph 6
(Use), Paragraph 7.1 (Tenant's Obligations), Paragraph 9 (Damage or Destruction)
and Paragraph 14 (Condemnation), Landlord at its expense and not subject to
reimbursement pursuant to Paragraph 4.2, shall keep in good order, condition and
repair the foundations and exterior walls of the Building and utility systems
outside the Building. Landlord, subject to reimbursement pursuant to Paragraph
4.2, shall keep in good order, condition and repair the Building roof and Common
Areas.

        7.3 Alterations. Construction by Tenant of Alterations shall be governed
by the following:

                A. Except as set forth below, Tenant shall not construct any
Tenant Alterations or otherwise alter, improve, modify, or perform any work of
improvement to the Premises without Landlord's prior written approval. However,
Tenant shall be entitled, without Landlord's prior approval, to make Tenant
Alterations (i) which do not affect the structural or exterior parts or water
tight character of the Building, and (ii) the reasonably estimated cost of
which, plus the original cost of any part of the Premises removed or materially
altered in connection with such Tenant Alterations, together do not exceed the
Permitted Tenant Alterations Limit per work of improvement. In the event
Landlord's approval for any Tenant Alterations is required, Tenant shall not
construct the Tenant Alterations until Landlord has approved in writing the
plans and specifications therefor. Such Tenant Alterations shall be constructed
substantially in compliance with such approved plans and specifications by a
licensed contractor first approved by Landlord. All Tenant Alterations (whether
Landlord's consent is required or not) shall be constructed by a licensed
contractor in accordance with all Laws (including the ADA) using new materials
of good quality.

                B. Tenant shall not commence construction of any Tenant
Alterations until (i) all required governmental approvals and permits have been
obtained, (ii) all requirements regarding insurance imposed by this Lease have
been satisfied, (iii) Tenant has given Landlord at least five days' prior
written notice of its intention to commence such construction, and (iv) if
requested by Landlord, Tenant has obtained contingent liability and broad form
builders' risk insurance in an amount reasonably satisfactory to Landlord if
there are any perils relating to the proposed construction not covered by
insurance carried pursuant to the Lease.

                C. All Tenant Alterations shall remain the property of Tenant
during the Lease Term but shall not be altered or removed from the Premises
except with Landlord's advance written permission. At the expiration or sooner
termination of the Lease Term, all Tenant Alterations shall be surrendered to
Landlord as part of the realty and shall then become Landlord's property, and
Landlord shall have no obligation to reimburse Tenant for all or any portion of
the value or cost thereof, provided, however, that if Landlord requires Tenant
to remove any Tenant Alterations, Tenant shall so remove such Tenant Alterations
prior to the expiration or sooner termination of the Lease Term. Notwithstanding
the foregoing, Tenant shall not be obligated to remove any Tenant Alterations
with respect to which the following is true: (i) Tenant was required, or
elected, to obtain the approval of Landlord to the installation of the Leasehold
Improvement in question; (ii) at the time Tenant requested Landlord's approval,
Tenant requested of Landlord in writing that Landlord inform Tenant of whether
or not Landlord would require Tenant to remove such Leasehold Improvement at the
expiration of the Lease Term; and (iii) at the time Landlord granted its
approval, it did not inform Tenant that it would require Tenant to remove such
Leasehold Improvement at the expiration of the Lease Term.

                D. Landlord's consent to the construction of Tenant Alterations
may be withheld in Landlord's sole discretion. Landlord's consent to
construction of Tenant Alterations and Landlord's approval of plans and
specifications for Tenant Alterations shall not create any responsibility or
liability on Landlord's part in regard to the completeness, competency, design
sufficiency, or compliance with Law of such Tenant Alterations or the plans and
specifications therefor.

        7.4 Surrender/Restoration. Tenant shall surrender the Premises by the
end of the last day of the Lease term or any earlier termination date, clean and
free of debris and in good operating order, condition and state of repair
ordinary wear and tear excepted. Without limiting the generality of the above,
Tenant shall remove all personal property, trade fixtures and floor bolts, patch
all floors and cause all lights to be in good operating condition.

8. INSURANCE; INDEMNITY.

        8.1 Payment of Premiums. The cost of the premiums for the insurance
policies maintained by Landlord under this Paragraph 8 shall be a Common Area
Operating Expense pursuant to Paragraph 4.2 hereof. Premiums for policy periods
commencing prior to, or

                                       6
<PAGE>   10

extending beyond, the term of this Lease shall be prorated to coincide with the
corresponding Commencement Date of Expiration Date.

        8.2 Tenant's Insurance.

                (i) At its sole cost and expense, Tenant shall maintain in full
force and effect during the Term of the lease the following insurance coverages
insuring against claims which may arise from or in connection with the Tenant's
operation and use of the leased premises.

                        (a) Commercial General Liability with minimum limits of
$1,000,000 per occurrence; $3,000,000 general aggregate for bodily injury,
personal injury and property damage. If required by Landlord, liquor liability
coverage will be included.

                        (b) Workers' Compensation insurance with statutory
limits and Employers Liability with a $1,000,000 per accident limit for bodily
injury or disease.

                        (c) Automobile Liability covering all owned, non-owned
and hired vehicles with a $1,000,000 per accident limit for bodily injury and
property damage.

                        (d) Property insurance against all risks of loss to any
tenant improvements or betterments and business personal property on a full
replacement cost basis with no coinsurance penalty provision; and Business
Interruption Insurance with a limit of liability representing loss of at least
approximately THREE months of income.

                (ii) Tenant shall deliver to AMB certificates of all insurance
reflecting evidence of required coverages prior to initial occupancy; and
annually thereafter.

                (iii) If, in the opinion of Landlord's insurance advisor, the
amount of scope of such coverage is deemed inadequate at any time during the
Term, Tenant shall increase such coverage to such reasonable amounts or scope as
Landlord's advisor deems adequate.

                (iv) All insurance required under Paragraph 8.2 (i) shall be
primary and non-contributory (ii) shall provide for severability of interests,
(iii) shall be issued by insurers, licensed to do business in the state in which
the Premises are located and which are rated A:VII or better by Best's Key
Rating Guide, (iv) shall be endorsed to include Landlord and such other persons
or entities as Landlord may from time to time designate, as additional insureds
(Commercial General Liability only), and (v) shall be endorsed to provide at
least 30-days prior notification of cancellation or material change in coverage
to said additional insureds.

        8.3 Landlord's Insurance. Landlord may, but shall not be obligated to,
maintain all risk, including earthquake and flood, insurance covering the
buildings within the Industrial Center, Commercial General Liability and such
other insurance in such amounts and covering such other liability or hazards as
deemed appropriate by Landlord. The amount and scope of coverage of Landlord's
insurance shall be determined by Landlord from time to time in its sole
discretion and shall be subject to such deductible amounts as Landlord may
elect. Landlord shall have the right to reduce or terminate any insurance or
coverage. Premiums for any such insurance shall be a Common Area Operating
Expense.

        8.4 Waiver of Subrogation. To the extent permitted by law and without
affecting the coverage provided by insurance required to be maintained
hereunder, Landlord and Tenant each waive any right to recover against the other
on account of any and all claims Landlord or Tenant may have against the other
with respect to property insurance actually carried, or required to be carried
hereunder, to the extent of the proceeds realized from such insurance coverage.

        8.5 Indemnity. TO THE FULLEST EXTEND PERMITTED BY LAW, TENANT HEREBY
AGREES TO DEFEND (WITH ATTORNEYS ACCEPTABLE TO LANDLORD), INDEMNIFY, PROTECT AND
HOLD HARMLESS LANDLORD AND LANDLORD'S AGENTS AND ANY SUCCESSORS TO ALL OR ANY
PORTION OF LANDLORD'S INTEREST IN THE PREMISES AND THEIR DIRECTORS, OFFICERS,
PARTNERS, EMPLOYEES, AUTHORIZED AGENTS, REPRESENTATIVES, AFFILIATES AND
MORTGAGES, FROM AND AGAINST ANY AND ALL DAMAGE, LOSS, CLAIM, LIABILITY AND
EXPENSE INCLUDING, BUT NOT LIMITED TO, ACTUAL ATTORNEY'S FEES AND LEGAL COSTS,
INCURRED DIRECTLY OR INDIRECTLY BY REASON OF ANY CLAIM, SUIT OR JUDGMENT BROUGHT
BY OR ON BEHALF OF (I) ANY PERSON OR PERSONS FOR DAMAGE, LOSS OR EXPENSE DUE TO,
BUT NOT LIMITED TO, BODILY INJURY OR PROPERTY DAMAGE SUSTAINED BY SUCH PERSON OR
PERSONS WHICH ARISE OUT OF, ARE OCCASIONED BY, OR ARE IN ANY WAY ATTRIBUTABLE TO
THE CONDITION, USE OR OCCUPANCY OF THE PREMISES OR THE ACTS OR OMISSIONS OF THE
TENANT OR TENANT'S AGENTS IN OR ABOUT THE PREMISES OR THE PROJECT (INCLUDING BUT
NOT LIMITED TO ANY EVENT OF DEFAULT HEREUNDER), OR (II) TENANT OR TENANT'S
AGENTS FOR DAMAGE, LOSS OR EXPENSE DUE TO, BUT NOT LIMITED TO, BODILY INJURY OR
PROPERTY DAMAGE WHICH ARISE OUT OF, ARE OCCASIONED BY, OR ARE IN ANY WAY
ATTRIBUTABLE TO THE USE IF ANY OF THE COMMON AREA, EXCEPT TO THE EXTENT CAUSED
SOLELY BY GROSS NEGLIGENCE OR WILLFUL MISCONDUCT OF LANDLORD. NOTWITHSTANDING
ANYTHING TO THE CONTRARY IN THIS LEASE, LANDLORD SHALL NOT BE RELEASED OR
INDEMNIFIED FROM, AND SHALL INDEMNIFY, DEFEND, PROTECT AND HOLD HARMLESS TENANT
FROM, ALL DAMAGES, LIABILITIES, JUDGMENTS, ACTIONS, CLAIMS, ATTORNEY'S FEES,
CONSULTANTS' FEES, PAYMENTS, COSTS AND EXPENSES ARISING FROM THE GROSS
NEGLIGENCE OR WILLFUL

                                       7
<PAGE>   11

MISCONDUCT OF LANDLORD OR ITS AGENTS, CONTRACTORS OR LICENSEES, OR LANDLORD'S
VIOLATION OR APPLICABLE LAW.

        8.6 Exemption of Landlord from Liability. Except to the extent caused by
the gross negligence or willful misconduct of Landlord, Landlord Entities shall
not be liable for and Tenant waives any claims against Landlord Entities for
injury or damage to the person or the property of Tenant, Tenant's employees,
contractors, invitees, customers or any other person in or about the Premises,
Building or Industrial Center from any cause whatsoever, including, but not
limited to, damage or injury which is caused by or results from (i) fire, steam,
electricity, gas, water or rain, or from the breakage, leakage, obstruction or
other defects of pipes, fire sprinklers, wires, appliances, plumbing, air
conditioning or lighting fixtures or (ii) from the condition of the Premises,
other portions of the Building or Industrial Center. Landlord shall not be
liable for any damages arising from any act or neglect of any other tenant of
Landlord nor from the failure by Landlord to enforce the provisions of any other
lease in the Industrial Center. Notwithstanding Landlord's negligence or breach
of this Lease, Landlord shall under no circumstances be liable for injury to
Tenant's business, for any loss of income or profit therefrom or any indirect,
consequential or punitive damages.

9. DAMAGE OR DESTRUCTION.

        9.1 Termination Right. Tenant shall give Landlord immediate written
notice of any damage to the Premises. Subject to the provisions of Paragraph
9.2, if the Premises or the Building shall be damaged to such an extent that
there is substantial interference for a period exceeding 90 consecutive days
with the conduct by Tenant of its business at the Premises, Tenant, at any time
prior to commencement of repair of the Premises and following 10 days written
notice to Landlord, may terminate this Lease effective 30 days after delivery of
such notice to Landlord. Such termination shall not excuse the performance by
Tenant of those covenants which under the terms hereof survive termination. Rent
shall be abated in proportion to the degree of interference during the period
that there is such substantial interference with the conduct of Tenant's
business at the Premises. Abatement of rent and Tenant's right of termination
pursuant to this provision shall be Tenant's sole remedy for failure of Landlord
to keep in good order, condition and repair the foundations and exterior walls
of the Building, Building roof, utility systems outside the Building and the
Common Areas.

        9.2 Damage Caused by Tenant. Tenant's termination rights under Paragraph
9.1 shall not apply if the damage to the Premises or Building is the result of
any act or omission of Tenant or of any of Tenant's agents, employees,
customers, invitees or contractors ("Tenant Acts"). Any damage resulting from a
Tenant Act shall be promptly repaired by Tenant. Landlord at its option may at
Tenant's expense repair any damage caused by Tenant Acts. Tenant shall continue
to pay all rent and other sums due hereunder and shall be liable to Landlord for
all damages that Landlord may sustain resulting from a Tenant Act.

10. REAL PROPERTY TAXES.

        10.1 Payment of Real Property Taxes. Landlord shall pay the Real
Property Taxes due and payable during the term of this Lease and, except as
otherwise provided in Paragraph 10.3, any such amounts shall be included in the
calculation of Operating Expenses in accordance with the provisions of Paragraph
4.2.

        10.2 Real Property Tax Definition. As used herein, the term "Real
Property Taxes" is any form of tax or assessment, general, special, ordinary or
extraordinary, imposed or levied upon (a) the Industrial Center, (b) any
interest of Landlord in the Industrial Center, (c) Landlord's right to rent or
other income from the Industrial Center, and/or (d) Landlord's business of
leasing the Premises. Real Property Taxes include (i) any license fee,
commercial rental tax, excise tax, improvement bond or bonds, levy or tax; (ii)
any tax or charge which replaces or is in addition to any of such
above-described "Real Property Taxes" and (iii) any fees, expenses or costs
(including attorney's fees, expert fees and the like) incurred by Landlord in
protesting or contesting any assessments levied or any tax rate. The term "Real
Property Taxes" shall also include any increase resulting from a change in the
ownership of the Industrial Center or Building, the execution of this Lease or
any modification, amendment or transfer thereof. Real Property Taxes for tax
years commencing prior to, or extending beyond, the term of this Lease shall be
prorated to coincide with the corresponding Commencement Date and Expiration
Date.

        10.3 Additional Improvements. Operating Expenses shall not include Real
Property Taxes attributable to improvements placed upon the Industrial Center by
other tenants or by Landlord for the exclusive enjoyment of such other tenants.
Notwithstanding Paragraph 10.1 hereof, Tenant shall, however, pay to Landlord at
the time Operating Expenses are payable under Paragraph 4.2, the entirety of any
increase in Real Property Taxes if assessed by reason of improvements placed
upon the Premises by Tenant or at Tenant's request.

        10.4 Joint Assessment. If the Building is not separately assessed, Real
Property Taxes allocated to the Building shall be an equitable proportion of the
Real Property Taxes for all of the land and improvements included within the tax
parcel assessed.

                                       8
<PAGE>   12

        10.5 Tenant's Property Taxes. Tenant shall pay prior to delinquency all
taxes assessed against and levied upon Tenant's improvements, fixtures,
furnishings, equipment and all personal property of Tenant contained in the
Premises or stored within the Industrial Center.

11. UTILITIES.

Tenant shall pay directly for all utilities and services supplied to the
Premises, including but not limited to electricity, telephone, security, gas and
cleaning of the Premises, together with any taxes thereon.

12. ASSIGNMENT AND SUBLETTING.

        12.1 Landlord's Consent Required.

                (a) Tenant shall not assign, transfer, mortgage or otherwise
transfer or encumber (collectively, "assign") or sublet all or any part of
Tenant's interest in this Lease or in the Premises without Landlord's prior
written consent which consent shall not be unreasonably withheld. Relevant
criteria in determining reasonability of consent include, but are not limited
to, credit history of a proposed assignee or sublessee, references from prior
landlords, any change or intensification of use of the Premises or the Common
Areas and any limitations imposed by the Internal Revenue Code and the
Regulations promulgated thereunder relating to Real Estate Investment Trusts.
Assignment or sublet shall not release Tenant from its obligations hereunder.
Tenant shall not (i) sublet or assign or enter into other arrangements such that
the amounts to be paid by the sublessee or assignee thereunder would be based,
in whole or in part, on the income or profits derived by the business activities
of the sublessee or assignee; (ii) sublet the Premises or assign this Lease to
any person in which Landlord owns an interest, directly or indirectly (by
applying constructive ownership rules set forth in Section 856(d)(5) of the
Internal Revenue Code (the "Code"); or (iii) sublet the Premises or assign this
Lease in any other manner which could cause any portion of the amounts received
by Landlord pursuant to this Lease or any sublease to fail to qualify as "rents
from real property" within the meaning of Section 856(d) of the Code, or which
could cause any other income received by Landlord to fail to qualify as income
described in Section 856(c)(2) of the Code. The requirements of this Section
12.1 shall apply to any further subleasing by any subtenant.

                (b) A change in the control of Tenant shall constitute an
assignment requiring Landlord's consent. The transfer, on a cumulative basis, of
50% or more of the voting or management control of Tenant shall constitute a
change in control for this purpose.

        12.2 Rent Adjustment. If, as of the effective date of any permitted
assignment or subletting the then remaining term of this Lease is less than ONE
(1) YEAR, Landlord may, as a condition to its consent: (i) require that the
amount and adjustment schedule of the rent payable under this Lease be adjusted
to what is then the market value and/or adjustment schedule for property similar
to the Premises as then constituted, as determined by Landlord; or (ii)
terminate the Lease as of the date of assignment or subletting subject to the
performance by Tenant of those covenants which under the terms hereof survive
termination.

13. DEFAULT; REMEDIES.

        13.1 Default. The occurrence of any one of the following events shall
constitute an event of default on the part of Tenant ("Default"):

                (a) The abandonment of the Premises by Tenant;

                (b) Failure to pay any installment of Base Rent, Additional Rent
or any other monies due and payable hereunder, said failure continuing for a
period of 3 BUSINESS days after the same is due;

                (c) A general assignment by Tenant or any guarantor for the
benefit of creditors;

                (d) The filing of a voluntary petition in bankruptcy by Tenant
or any guarantor, the filing of a voluntary petition for an arrangement, the
filing of a petition, voluntary or involuntary, for reorganization, or the
filing of an involuntary petition by Tenant's creditors or guarantors;

                (e) Receivership, attachment, of other judicial seizure of the
Premises or all or substantially all of Tenant's assets on the Premises;

                (f) Failure of Tenant to maintain insurance as required by
Paragraph 8.2;

                (g) Any breach by Tenant of its covenants under Paragraph 6.2;

                (h) Failure in the performance of any of Tenant's covenants,
agreements or obligations hereunder (except those failures specified as events
of Default in other Paragraphs of this Paragraph 13.1 which shall be governed by
such other Paragraphs), which failure continues for 10 days after written notice
thereof from Landlord to Tenant provided that, if Tenant has exercised
reasonable diligence to cure such failure and such failure cannot be cured
within such 10 day period despite reasonable diligence, Tenant shall not be in
default under this subparagraph unless Tenant fails thereafter diligently and
continuously to prosecute the cure to completion;

                (i) Any transfer of a substantial portion of the assets of
Tenant, or any incurrence of a material obligation by Tenant, unless such
transfer or obligation is undertaken

                                       9
<PAGE>   13

or incurred in the ordinary course of Tenants business or in good faith for
equivalent consideration, or with Landlord's consent; and

                (j) The default of any guarantors of Tenant's obligations
hereunder under any guaranty of this Lease, or the attempted repudiation or
revocation of any such guaranty.

        13.2 Remedies. In the event of any Default by Tenant, Landlord shall
have the remedies set forth in the Addendum attached hereto entitled "Landlord's
Remedies in Event of Tenant Default".

        13.3 Late Charges. Tenant hereby acknowledges that late payment by
Tenant to Landlord of rent and other sums due hereunder will cause Landlord to
incur costs not contemplated by this Lease, the exact amount of which will be
extremely difficult to ascertain. Such costs include, but are not limited to,
processing and accounting charges. Accordingly, if any installment of rent or
other sum due from Tenant shall not be received by Landlord or Landlord's
designee within 10 days after such amount shall be due, then, without any
requirement for notice to Tenant, Tenant shall pay to Landlord a late charge
equal to 5% of such overdue amount. The parties hereby agree that such late
charge represents a fair and reasonable estimate of the costs Landlord will
incur by reason of late payment by Tenant. Acceptance of such late charge by
Landlord shall in no event constitute a waiver of Tenant's Default with respect
to such overdue amount, nor prevent Landlord from exercising any of the other
rights and remedies granted hereunder. NOTWITHSTANDING ANYTHING TO THE CONTRARY
IN THIS LEASE, IF TENANT IS DELINQUENT IN THE PAYMENT OF RENT AND IS SUBJECT TO
A LATE CHARGE OR INTEREST FEE, LANDLORD AGREES TO WAIVE THE LATE CHARGE OR
INTEREST FEE IF (i) TENANT HAS NOT BEEN LATE IN ITS PAYMENT OF RENT DURING THE
TWELVE (12) MONTH PERIOD PRECEDING THE RENT DELINQUENCY IN QUESTION AND (ii) THE
RENT DUE IS PAID WITHIN FIVE (5) DAYS OF LANDLORD'S WRITTEN NOTICE TO THE TENANT
OF THE DELINQUENCY AMOUNT OWED.

14. CONDEMNATION.

If the Premises or any portion thereof are taken under the power of eminent
domain or sold under the threat of exercise of said power (all of which are
herein called "condemnation"), this Lease shall terminate as to the part so
taken as of the date the condemning authority takes title or possession,
whichever first occurs. If more than 10% of the floor area of the Premises, or
more than 25% of the portion of the Common Areas designated for Tenant's
parking, is taken by condemnation, Tenant may, at Tenant's option, to be
exercised in writing within 10 days after Landlord shall have given Tenant
written notice of such taking (or in the absence of such notice, within 10 days
after the condemning authority shall have taken possession) terminate this Lease
as of the date the condemning authority takes such possession. If Tenant does
not terminate this Lease in accordance with the foregoing, this Lease shall
remain in full force and effect as to the portion of the Premises remaining,
except that the Base Rent shall be reduced in the same proportion as the
rentable floor area of the Premises taken bears to the total rentable floor area
of the Premises. No reduction of Base Rent shall occur if the condemnation does
not apply to any portion of the Premises. Any award for the taking of all or any
part of the Premises under the power of eminent domain or any payment made under
threat of the exercise of such power shall be the property of Landlord,
provided, however, that Tenant shall be entitled to any compensation, separately
awarded to Tenant for Tenant's relocation expenses and/or loss of Tenants trade
fixtures. In the event that this Lease is not terminated by reason of such
condemnation, Landlord shall to the extent of its net severance damages in the
condemnation matter, repair any damage to the Premises caused by such
condemnation authority. Tenant shall be responsible for the payment of any
amount in excess of such net severance damages required to complete such repair.

15. ESTOPPEL CERTIFICATE AND FINANCIAL STATEMENTS.

        15.1 Estoppel Certificate. Each party (herein referred to as "Responding
Party") shall within 10 days after written notice from the other Party (the
"Requesting Party") execute, acknowledge and deliver to the Requesting Party, to
the extent it can truthfully do so, an estoppel certificate, plus such
additional information, confirmation and/or statements as be reasonably
requested by the Requesting Party.

        15.2 Financial Statement. If Landlord desires to finance, refinance, or
sell the Building, Industrial Center or any part thereof, Tenant and all
Guarantors shall deliver to any potential lender or purchaser designated by
Landlord such financial statements of Tenant and such Guarantors as may be
reasonably required by such lender or purchaser, including but not limited to
Tenant's financial statements for the past 3 years. All such financial
statements shall be received by Landlord and such lender or purchaser in
confidence and shall be used only for the purposes herein set forth.

16. ADDITIONAL COVENANTS AND PROVISIONS.

        16.1 Severability. The invalidity of any provision of this Lease, as
determined by a court of competent jurisdiction, shall not affect the validity
of any other provision hereof.

        16.2 Interest on Past-Due Obligations. Any monetary payment due Landlord
hereunder not received by Landlord within 10 days following the date on which it
was due shall,

                                       10
<PAGE>   14

bear interest from the date due at 12% per annum, but not exceeding the maximum
rate allowed by law in addition to the late charge provided for in Paragraph
13.3.

        16.3 Time of Essence. Time is of the essence with respect to the
performance of all obligations to be performed or observed by the Parties under
this Lease.

        16.4 Landlord Liability. Tenant, its successors and assigns, shall not
assert nor seek to enforce any claim for breach of this Lease against any of
Landlord's assets other than Landlord's interest in the Industrial Center.
Tenant agrees to look solely to such interest for the satisfaction of any
liability or claim against Landlord under this Lease. In no event whatsoever
shall Landlord (which term shall include, without limitation, any general or
limited partner, trustees, beneficiaries, officers, directors, or stockholders
of Landlord) ever be personally liable for any such liability.

        16.5 No Prior or Other Agreements. This Lease contains all agreements
between the Parties with respect to any matter mentioned herein, and supersedes
all oral, written prior or contemporaneous agreements or understandings.

        16.6 Notice Requirements. All notices required or permitted by this
Lease shall be in writing and may be delivered in person (by hand or by
messenger or courier service) or may be sent by regular, certified or registered
mail or U.S. Postal Service Express Mail, with postage prepaid, or by facsimile
transmission during normal business hours, and shall be deemed sufficiently
given if served in a manner specified in the Paragraph 16.6. The addresses noted
adjacent to a Party's signature on this Lease shall be that Party's address for
delivery or mailing of notice purposes. Either Party may by written notice to
the other specify a different address for notice purposes, except that upon
Tenant's taking possessing of the Premises, the Premises shall constitute
Tenant's address for the purpose of mailing or delivering notices to Tenant. A
copy of all notices required or permitted to be given to Landlord hereunder
shall be concurrently transmitted to such party or parties at such addresses as
Landlord may from time to time hereafter designate by written notice to Tenant.

        16.7 Date of Notice. Any notice sent by registered or certified mail,
return receipt requested, shall be deemed given on the date of delivery shown on
the receipt card, or if no delivery date is shown, the postmark thereon. If sent
by regular mail, the notice shall be deemed given 48 hours after the same is
addressed as required herein and mailed with postage prepaid. Notices delivered
by United States Express Mail or overnight courier that guarantees next day
delivery shall be deemed given 24 hours after delivery of the same to the United
States Postal Service or courier. If any notice is transmitted by facsimile
transmission or similar means, the same shall be deemed served or delivered upon
telephone or facsimile confirmation of receipt of the transmission thereof,
provided a copy is also delivered via hand or overnight delivery or certified
mail. If notice is received on a Saturday or a Sunday or a legal holiday, it
shall be deemed received on the next business day.

        16.8 Waivers. No waiver by Landlord of a Default by Tenant shall be
deemed a waiver of any other term, covenant or condition hereof, or of any
subsequent Default by Tenant of the same or any other term, covenant or
condition hereof.

        16.9 Holdover. Tenant has no right to retain possession of the Premises
or any part thereof beyond the expiration or earlier termination of this Lease.
If Tenant holds over with the consent of Landlord: (i) the Base Rent payable
shall be increased to 150% of the Base Rent applicable during the month
immediately preceding such expiration or earlier termination; (ii) Tenant's
right to possession shall terminate on 30 days notice from Landlord and (iii)
all other terms and conditions of this Lease shall continue to apply. Nothing
contained herein shall be construed as a consent by Landlord to any holding over
by Tenant. Tenant shall indemnify, defend and hold Landlord harmless from and
against any and all claims, demands, actions, losses, damages, obligations,
costs and expenses, including, without limitation, attorneys' fees incurred or
suffered by Landlord by reason of Tenant's failure to surrender the Premises on
the expiration or earlier termination of this Lease in accordance with the
provisions of this Lease.

        16.10 Cumulative Remedies. No remedy or election hereunder shall be
deemed exclusive but shall, wherever possible, be cumulative with all other
remedies in law or in equity.

        16.11 Binding Effect: Choice of Law. This Lease shall be binding upon
the Parties, their personal representatives, successors and assigns and be
governed by the laws of the State in which the Premises are located. Any
litigation between the Parties hereto concerning this Lease shall be initiated
in the county in which the Premises are located.

        16.12 Landlord. The covenants and obligations contained in this Lease on
the part of Landlord are binding on Landlord, its successors and assigns, only
during and in respect of their respective period of ownership of such interest
in the Industrial Center. In the event of any transfer or transfers of such
title to the Industrial Center, Landlord (and in case of any subsequent
transfers or conveyances, the then grantor) shall be concurrently freed and
relieved from and after the date of such transfer of conveyance, without any
further instrument or

                                       11
<PAGE>   15

agreement, of all liability with respect to the performance of any covenants or
obligations on the part of Landlord contained in this Lease thereafter to be
performed.

        16.13 Attorneys' Fees and Other Costs. If any Party brings an action or
proceeding to enforce the terms hereof or declare rights hereunder, the
Prevailing Party (as hereafter defined) in any such proceeding shall be entitled
to reasonable attorneys' fees. The term "Prevailing Party" shall include,
without limitation, a Party who substantially obtains or defeats the relief
sought. Landlord shall be entitled to attorneys' fees, costs and expenses
incurred in preparation and service of notices of Default and consultations in
connection therewith, whether or not a legal action is subsequently commenced in
connection with such Default or resulting breach. Tenant shall reimburse
Landlord on demand for all reasonable legal, engineering and other professional
services expenses incurred by Landlord in connection with all requests by Tenant
for consent or approval hereunder.

        16.14 Landlord's Access: Showing Premises: Repairs. Landlord and
Landlord's agents shall have the right to enter the Premises at any time, in the
case of an emergency, and otherwise at reasonable times upon reasonable notice
for the purpose of showing the same to prospective purchasers, lenders, or
tenants, and making such alterations, repairs, improvements or additions to the
Premises or to the Building, as Landlord may reasonably deem necessary. Landlord
may at any time place on or about the Premises or Building any ordinary "For
Sale" signs and Landlord may at any time during the last 180 days of the term
hereof place on or about the Premises any ordinary "For Lease" signs. All such
activities of Landlord shall be without abatement of rent or liability to
Tenant.

        16.15 Signs. Tenant shall not place any signs at or upon the exterior of
the Premises or the Building, except that Tenant may, with Landlord's prior
written consent, install (but not on the roof) such signs as are reasonably
required to advertise Tenant's own business so long as such signs are in a
location designated by Landlord and comply with sign ordinances and the signal
criteria established for the Industrial Center by Landlord.

        16.16 Termination: Merger. Unless specifically stated otherwise in
writing by Landlord, the voluntary or other surrender of this Lease by Tenant,
the mutual termination or cancellation hereof, or a termination hereof by
Landlord for Default by Tenant, shall terminate any sublease or lesser estate in
the Premises; provided, however, Landlord shall, in the event of any such
surrender, termination or cancellation, have the option to continue any one or
all of any existing subtenancies.

        16.17 Quiet Possession. Upon payment by Tenant of the Base Rent and
Additional Rent for the Premises and the performance of all of the covenants,
conditions and provisions on Tenant's part to be observed and performed under
this Lease, Tenant shall have quiet possession of the Premises for the entire
term hereof subject to all of the provisions of this Lease.

        16.18 Subordination: Attainment; Non-Disturbance.

                (a) Subordination. This Lease shall be subject and subordinate
to any ground lease, mortgage, deed of trust, or other hypothecation or mortgage
(collectively, "Mortgage") now or hereafter placed by Landlord upon the real
property of which the Premises are a part, to any and all advances made on the
security thereof and to all renewals, modifications, consolidations,
replacements and extensions thereof. Tenant agrees that any person holding any
Mortgage shall have no duty, liability or obligation to perform any of the
obligations of Landlord under this Lease. In the event of Landlord's default
with respect to any such obligation, Tenant will give any Lender, whose name and
address have previously in writing been furnished Tenant, notice of a default by
Landlord. Tenant may not exercise any remedies for default by Landlord unless
and until Landlord and the Lender shall have received written notice of such
default and a reasonable time (not less than 60 DAYS) shall thereafter have
elapsed without the default having been cured. If any Lender shall elect to have
this Lease superior to the lien of its Mortgage and shall give written notice
thereof to Tenant, this Lease shall be deemed prior to such Mortgage. The
provisions of a Mortgage relating to the disposition of condemnation and
insurance proceeds shall prevail over any contrary provisions contained in this
Lease.

                (b) Attornment. Subject to the non-disturbance provisions of
subparagraph C of this Paragraph 16.18, Tenant agrees to attorn to a Lender or
any other party who acquires ownership of the Premises by reason of a
foreclosure of a Mortgage. In the event of such foreclosure, such new owner
shall not: (i) be liable for any act or omission of any prior landlord or with
respect to events occurring prior to acquisition of ownership, (ii) be subject
to any offsets or defenses which Tenant might have against any prior Landlord,
or (iii) be liable for security deposits or be bound by prepayment of more than
one month's rent.

                (c) Non-Disturbance. With respect to Mortgage entered into by
Landlord after the execution of this Lease, Tenant's subordination of this Lease
shall be subject to receiving assurance (a "non-disturbance agreement") from the
Mortgage holder that Tenant's

                                       12
<PAGE>   16

possession and this Lease will not be disturbed so long as Tenant is not in
default and attorns to the record owner of the Premises.

                (d) Self-Executing. The agreements contained in this Paragraph
16.18 shall be effective without the execution of any further documents;
provided, however, that upon written request from Landlord or a Lender in
connection with a sale, financing or refinancing of Premises, Tenant and
Landlord shall execute such further writings as may be reasonably required to
separately document any such subordination or non-subordination, attornment
and/or non-disturbance agreement as is provided for herein. Landlord is hereby
irrevocably vested with full power to subordinate this Lease to a Mortgage.

        16.19 Rules and Regulations. Tenant agrees that it will abide by, and to
cause its employees, suppliers, shippers, customers, tenants, contractors and
invitees to abide by all reasonable rules and regulations ("Rules and
Regulations") which Landlord may make from time to time for the management,
safety, care, and cleanliness of the Common Areas, the parking and unloading of
vehicles and the preservation of good order, as well as for the convenience of
other occupants or tenants of the Building and the Industrial Center and their
invitees. Landlord shall not be responsible to Tenant for the non-compliance
with said Rules and Regulations by other tenants of the Industrial Center.

        16.20 Security Measures. Tenant acknowledges that the rental payable to
Landlord hereunder does not include the cost of guard service or other security
measures. Landlord has no obligations to provide same. Tenant assumes all
responsibility for the protection of the Premises, Tenant, its agents and
invitees and their property from the acts of third parties.

        16.21 Reservations. Landlord reserves the right to grant such easements
that Landlord deems necessary and to cause the recordation of parcel maps, so
long as such easements and maps do not reasonably interfere with the use of the
Premises by Tenant. Tenant agrees to sign any documents reasonable requested by
Landlord to effectuate any such easements or maps.

        16.22 Conflict. Any conflict between the printed provisions of this
Lease and the typewritten or handwritten provisions shall be controlled by the
typewritten or handwritten provisions.

        16.23 Offer. Preparation of this Lease by either Landlord or Tenant or
Landlord's agent or Tenant's agent and submission of same to Tenant or Landlord
shall not be deemed an offer to lease. This Lease is not intended to be binding
until executed and delivered by all Parties hereto.

        16.24 Amendments. This Lease may be modified only in writing, signed by
the parties in interest at the time of the modification.

        16.25 Multiple Parties. Except as otherwise expressly provided herein,
if more than one person or entity is named herein as Tenant, the obligations of
such persons shall be the joint and several responsibility of all persons or
entities named herein as such Tenant.

        16.26 Authority . Each person signing on behalf of Landlord or Tenant
warrants and represents that he or she is authorized to execute and deliver this
Lease and to make it a binding obligation of Landlord or Tenant.

                The parties hereto have executed this Lease at the place and on
the dates specified above their respective signatures.

LANDLORD:                                   TENANT:
AMB PROPERTY, L.P.                          HARMONIC, INC.
a Delaware limited partnership              a Delaware corporation
By: AMB Property Corporation,
    a Maryland corporation                  By: /s/ ROBIN N. DICKSON
                                               ---------------------------------
                                               Robin N. Dickson

By: /s/ JOHN L. ROSSI                       Its: Chief Financial Officer
   --------------------------------             --------------------------------
   John L. Rossi

Its: Regional Manager                       By:
                                               ---------------------------------

                                            Its:
                                                --------------------------------

Telephone: (415)394-9000                    Telephone: (408)542-2661
Facsimile: (415)394-0903                    Facsimile: (408)542-2516

Executed at: 505 Montgomery Street          Executed at: 632 Caribbean Avenue
             6th Floor                      Sunnyvale, CA 94089
             San Francisco, CA 94111

Date: 5/12/00                               Date:

                                       13
<PAGE>   17

                             FIRST ADDENDUM TO LEASE

THIS FIRST ADDENDUM is dated for reference purposes as April 18, 2000, and is
made a part of that Lease Agreement (the "Lease") dated April 18, 2000, by and
between AMB PROPERTY L.P., a Delaware limited partnership ("Landlord") and
HARMONIC, INC., a Delaware corporation ("Tenant") affecting certain real
property commonly known as 646 Caribbean Drive, Sunnyvale, California, with
reference to the following facts:

        1. Base Monthly Rent:

                October 1, 2000 - December 31, 2000:  $2.00 NNN per square foot
                                                      per month

                January 1, 2001 - December 31, 2001:  $2.10 NNN per square foot
                                                      per month
                January 1, 2002 - December 31, 2002:  $2.20 NNN per square foot
                                                      per month
                January 1, 2003 - December 31, 2003:  $2.30 NNN per square foot
                                                      per month
                January 1, 2004 - December 31, 2004:  $2.40 NNN per square foot
                                                      per month
                January 1, 2005 - December 31, 2005:  $2.50 NNN per square foot
                                                      per month
                January 1, 2006 - December 31, 2006:  $2.60 NNN per square foot
                                                      per month
                August 2, 2006                        Adjustment to Fair market
                                                      Value (FMV)
                January 1, 2007 - December 31, 2007:  $2.70 NNN per square foot
                                                      per month or FMV
                January 1, 2008 - December 31, 2008:  $2.80 NNN per square foot
                                                      per month of FMV
                January 1, 2009 - December 31, 2009:  $2.90 NNN per square foot
                                                      per month or FMV
                January 1, 2010 - September 30, 2010: $3.00 NNN per square foot
                                                      per month or FMV

                A. The Base Monthly Rent for the Period after August 2, 2006
shall be the greater of (i) one hundred percent (100%) of the Base Monthly Rent
Schedule, or (ii) one hundred percent (100%) of the then fair market monthly
rent determined as of the commencement of the Period in question based upon like
buildings with like improvements in the area within the boundaries of Highways
101, 880 and the San Francisco Bay. However, the Fair Market Value Rent as
determined by appraisal shall not exceed $4.00 per square foot per month in
August 2006 with 5% annual increases through the balance of the term. The Period
shall contain no free rent and the Premises shall be taken "as-is". If the
parties are unable to agree upon the fair market monthly rent for the Premises
for the option period in question at least seventy-five (75) days prior to the
commencement of the option period in question, then the fair market monthly rent
shall be determined by appraisal conducted pursuant to subparagraph B.

                B. In the event it becomes necessary to determine by appraisal
the fair market rent of the Premises for the purpose of establishing the Base
Monthly Rent during the Period, then such fair market monthly rent shall be
determined by three (3) real estate appraisers, all of whom shall be members of
the American Institute of Real Estate Appraisers with not less than five (5)
years experience appraising real property (other than residential or
agricultural property) located in Santa Clara County, California, in accordance
with the following procedures:

                        (1) The party demanding an appraisal (the "Notifying
Party") shall notify the other party (the "Non-Notifying Party") thereof by
delivering a written demand for appraisal, which demand, to be effective, must
give the name, address, and qualifications of an appraiser selected by the
Notifying Party. Within ten (10) days of receipt of said demand, the
Non-Notifying Party shall select its appraiser and notify the Notifying Party,
in writing, of the name, address, and qualifications of an appraiser selected by
it. Failure by the Non-Notifying Party to select a qualified appraiser within
said ten (10) day period shall be deemed a waiver of its right to select a
second appraiser on its own behalf and the Notifying Party shall select a
second appraiser on behalf of the Non-Notifying Party within five (5) days after
the expiration of said ten (10) day period. Within ten (10) days from the date
the second appraiser shall have been appointed, the two (2) appraisers so
selected shall appoint a third appraiser. If the two appraisers fail to select a
third qualified appraiser, the third appraiser shall be selected by the American
Arbitrations Association or if it shall refuse to perform this function, then at
the request of either Landlord or Tenant, such third appraiser shall be promptly
appointed by the then Presiding Judge of the Superior Court of the State of
California for the County of Santa Clara.

                        (2) The three (3) appraisers so selected shall meet in
San Jose, California, not later than twenty (20) days following the selection of
the third appraiser. At said

<PAGE>   18
meeting the appraisers so selected shall attempt to determine the fair market
monthly rent of the Premises for the period in question (including the timing
and amount of periodic increases).

                        (3) If the appraisers so selected are unable to complete
their determinations in one meeting, they may continue to consult at such times
as they deem necessary for a fifteen (15) day period from the date of the first
meeting, in an attempt to have at least two (2) of them agree. If, at the
initial meeting or at any time during said fifteen (15) day period, two (2) or
more of the appraisers so selected agree on the fair market rent of the Leased
Premises, such agreement shall be determinative and binding on the parties
hereto, and the agreeing appraisers shall, in simple letter form executed by the
agreeing appraisers, forthwith notify both Landlord and Tenant of the amount set
by such agreement.

                        (4) If two (2) or more appraisers do not so agree within
said fifteen (15) day period, then each appraiser shall, within five (5) days
after the expiration of said fifteen (15) day period, submit his independent
appraisal in simple letter form to Landlord and Tenant stating his determination
of the fair market rent of the Premises for the period in question. The parties
shall then determine the fair market rent for the Premises by determining the
average of the fair market rent set by each of the appraisers. However, if the
lowest appraisal is less than eighty-five percent (85%) of the middle appraisal
then such lowest appraisal shall be disregarded and/or if the highest appraisal
is greater than one hundred fifteen percent (115%) of the middle appraisal then
such highest appraisal shall be disregarded. If the fair market rent set by any
appraisal is so disregarded, then the average shall be determined by computing
the average set by the other appraisals that have not been disregarded.

                        (5) Nothing contained herein shall prevent Landlord and
Tenant from jointly selecting a single appraiser to determine the fair market
rent of the Premises, in which event the determination of such appraisal shall
be conclusively deemed the fair market rent of the Premises.

                        (6) Each party shall bear the fees and expenses of the
appraiser selected by or for it, and the fees and expenses of the third
appraiser (or the joint appraiser if one joint appraiser is used) shall be borne
fifty percent (50%) by Landlord and fifty percent (50%) by Tenant.

        2. Early Occupancy:

                A. As consideration for Tenant's performance of all obligations
to be performed by Tenant under the Lease, and upon receipt of (i) the first
month's Base Monthly Rent and Security Deposit totaling $221,850.00, and (ii) a
certificate of insurance as provided by Article 9.1 C of the Lease, Landlord
shall permit Tenant to enter and use the Premises commencing thirty (30) days
prior to Commencement until the Commencement Date (the "Early Occupancy
Period"). Such occupancy during the Early Occupancy Period shall be subject to
all of the terms, covenants and conditions of the Lease provided, however, that
the rent payable during the Early Occupancy Period shall be waived.

                B. In the event either party shall bring any action or legal
proceeding for damages for alleged breach of any provision of this agreement, to
recover rent, to terminate tenancy of the Premises, or to enforce, protect or
establish any term or covenant of this agreement or the Lease or right of remedy
of either party, the prevailing party shall be entitled to recover as a part of
such action or proceeding, reasonable attorney's fees and court costs as may be
fixed by the court or jury.

                C. In consideration of executing this Early Occupancy Agreement,
Tenant agrees to indemnify and save landlord harmless of and from any and all
liability, damage, expense, cause of action, suits or claims or judgments
resulting from injury to person or property arising from the use of the Premises
by Tenant during the Early Occupancy Period, including loss or damage to Tenant,
its equipment, materials or supplies.

                D. Tenant agrees to cooperate with construction personnel
completing the Interior Improvements in the Premises and not cause any delay in
the completion of these improvements. It is the intent of Landlord and Tenant
that Tenant's obligation to pay the Base Monthly Rent and all Additional Rent
not be delayed by any cause or other act of Tenant and, if it is so delayed, and
provided that Landlord promptly notifies Tenant in writing of each separate
delay and the estimated period of delay, then Tenant's obligation to pay the
Base

                                       2
<PAGE>   19

Monthly Rent AND all Additional Rent shall commence as of the date it would have
commenced absent said delay caused by Tenant.

                E. During the Early Occupancy Period, Tenant shall arrange to
have all utility services, including but not limited to gas, electric, water and
trash, billed directly to Tenant for payment.

        3. Tenant Maintenance: Tenant shall (i) maintain, repair and replace
when necessary all HVAC equipment which services only the Premises, and shall
keep the same in good condition through regular inspection and servicing, and
(ii) maintain continuously throughout the Lease Term a service contract for the
maintenance of all such HVAC equipment with a licensed HVAC repair and
maintenance contractor approved by Landlord, which contract provides for the
periodic inspection and servicing of the HVAC equipment at least once every
sixty (60) days during the Lease Term. Tenant shall furnish Landlord with a copy
of such service contract, which shall provide that it may not be cancelled or
changed without at least thirty (30) days' prior written notice to Landlord.
Notwithstanding the foregoing, Landlord may elect at any time to assume
responsibility for the maintenance, repair and replacement of such HVAC
equipment which serves only the Premises. Tenant shall maintain continuously
through the Lease Term a service contract for the washing of all windows (both
interior and exterior surfaces) in the Premises.

        4. Landlord's Remedies in Event of Tenant Default: (AMB)

                A. Termination. In the event of any Default by Tenant, then in
addition to any other remedies available to Landlord at law or in equity and
under this Lease, Landlord shall have the immediate option to terminate this
Lease and all rights of Tenant hereunder by giving written notice of such
intention to terminate. In the event that Landlord shall elect to so terminate
this Lease then Landlord may recover from Tenant:

                        (1) the worth at the time of award of any unpaid Rent
and any other sums due and payable which have been earned at the time of such
termination; plus

                        (2) the worth at the time of award of the amount by
which the unpaid Rent and any other sums due and payable which would have been
earned after termination until the time of award exceeds the amount of such
rental loss Tenant proves could have been reasonably avoided; plus

                        (3) the worth at the time of award of the amount by
which the unpaid Rent and any other sums due and payable for the balance of the
term of this Lease after the time of award exceeds the amount of such rental
loss that Tenant proves could be reasonably avoided; plus

                        (4) any other amount necessary to compensate Landlord
for all the detriment proximately caused by Tenant's failure to perform its
obligations under this Lease or which in the ordinary course would be likely to
result therefrom, including, without limitation, any costs or expenses incurred
by Landlord (i) in retaking possession of the Premises; (ii) in maintaining,
repairing, preserving, restoring, replacing, cleaning, altering or
rehabilitating the Premises or any portion thereof, including such acts for
reletting to a new lessee or lessees; (iii) for leasing commissions; or (iv) for
any other costs necessary or appropriate to relet the Premises; plus

                        (5) such reasonable attorneys' fees incurred by Landlord
as a result of a Default, and costs in the event suit is filed by Landlord to
enforce such remedy; and plus

                        (6) at Landlord's election, such other amounts in
addition to or in lieu of the foregoing as may be permitted from time to time by
applicable law.

As used in subparagraphs (1) and (2) above, the "worth at the time of award" is
computed by allowing interest at an annual rate equal to twelve percent (12%)
per annum or the maximum rate permitted by law, whichever is less. As used in
subparagraph (3) above, the "worth at the time of award" is computed by
discounting such amount at the discount rate of the Federal Reserve Bank of San
Francisco at the time of award, plus one percent (1%). Tenant waives redemption
or relief from forfeiture under California Code of Civil Procedure Sections 1174
and 1179, or under any other present or future law, in the event Tenant is
evicted or Landlord takes possession of the Premises by reason of any Default of
Tenant hereunder.

                                       3
<PAGE>   20

                B. Continuation of Lease. In the event of any Default by Tenant,
then in addition to any other remedies available to Landlord at law or in equity
and under this Lease, Landlord shall have the remedy described in California
Civil Code Section 1951.4 (Landlord may continue this Lease in effect after
Tenant's Default and abandonment and recover Rent as it becomes due, provided
tenant has the right to sublet or assign, subject only to reasonable
limitations).

                C. Re-entry. In the event of any Default by Tenant, Landlord
shall also have the right, with or without terminating this Lease, in compliance
with applicable law, to re-enter the Premises and remove all persons and
property from the Premises; such property may be removed and stored in a public
warehouse or elsewhere at the cost of and for the account of Tenant.

                D. Reletting. In the event of the abandonment of the Premises
by Tenant or in the event that Landlord shall elect to re-enter or shall take
possession of the Premises pursuant to legal proceeding or pursuant to any
notice provided by law, then if Landlord does not elect to terminate this Lease
as provided in Paragraph a, Landlord may from time to time, without terminating
this Lease, relet the Premises or any part thereof for such term or terms and at
such rental or rentals and upon such other terms and conditions as Landlord in
its sole discretion may deem advisable with the right to make alterations and
repairs to the Premises. In the event that Landlord shall elect to so relet,
then rentals received by Landlord from such reletting shall be applied in the
following order: (1) to reasonable attorneys' fees incurred by Landlord as a
result of a Default and costs in the event suit is filed by Landlord to enforce
such remedies; (2) to the payment of any indebtedness other than Rent due
hereunder from Tenant to Landlord; (3) to the payment of any costs of such
reletting; (4) to the payment of the costs of any alterations and repairs to the
Premises; (5) to the payment of Rent due and unpaid hereunder; and (6) the
residue, if any, shall be held by Landlord and applied in payment of future Rent
and other sums payable by Tenant hereunder as the same may become due and
payable hereunder. Should that portion of such rentals received from such
reletting during any month, which is applied to the payment of Rent hereunder,
be less than the Rent payable during the month by Tenant hereunder, then Tenant
shall pay such deficiency to Landlord. Such deficiency shall be calculated and
paid monthly. Tenant shall also pay to Landlord, as soon as ascertained, any
costs and expenses incurred by Landlord in such reletting or in making such
alterations and repairs not covered by the rentals received from such reletting.

                E. Termination. No re-entry or taking of possession of the
Premises by Landlord pursuant to this Addendum shall be construed as an election
to terminate this Lease unless a written notice of such intention is given to
Tenant or unless the termination thereof is decreed by a court of competent
jurisdiction. Notwithstanding any reletting without termination by Landlord
because of any Default by Tenant, Landlord may at any time after such reletting
elect to terminate this Lease for any such Default.

                F. Cumulative Remedies. The remedies herein provided are not
exclusive and Landlord shall have any and all other remedies provided herein or
by law or in equity.

                G. No Surrender. No act or conduct of Landlord, whether
consisting of the acceptance of the keys to the Premises, or otherwise, shall be
deemed to be or constitute an acceptance of the surrender of the Premises by
Tenant prior to the expiration of the Term, and such acceptance by Landlord of
surrender by Tenant shall only flow from and must be evidenced by a written
acknowledgment of acceptance of surrender signed by Landlord. The surrender of
this Lease by Tenant, voluntarily or otherwise, shall not work a merger unless
Landlord elects in writing that such merger take place, but shall operate as an
assignment to Landlord of any and all existing subleases, or Landlord may, at
its option, elect in writing to treat such surrender as a merger terminating
Tenant's estate under this Lease, and thereupon Landlord may terminate any or
all such subleases by notifying the sublessee of its election so to do within
five (5) days after such surrender.

                H. Notice Provisions. Tenant agrees that any notice given by
Landlord pursuant to Paragraph 13.1 of the Lease shall satisfy the requirements
for notice under California Code of Civil Procedure Section 1161, and Landlord
shall not be required to give any additional notice in order to be entitled to
commence an unlawful detainer proceeding.

        5. Year 2000 Disclaimer: Landlord hereby disclaims any liability for any
and all damages, injuries or other losses, whether ordinary, special,
consequential, punitive or

                                       4
<PAGE>   21

otherwise, arising out of, relating to, or in connection with, (a) the failure
of any automated, computerized and/or software system or other technology used
in, on, or about the Property or relating to the management or operation of the
Property to accurately receive, provide or process date/time data (including,
but not limited to, calculating, comparing and sequencing) both before and after
September 9, 1999, and before, after, during and between the years 1999 A. D.
and 2000 A. D., and leap year calculations and, or (b) the malfunction, ceasing
to function or providing of invalid or incorrect results by any such technology
as a result of date/time data. The foregoing disclaimer shall apply to any such
technology used in, on, or about the Property or that affects the Property,
whether or not such technology is within the control of Owner or any of Owner's
agents or representatives. THE FOREGOING DISCLAMIER INCLUDES A DISCLAIMER OF ALL
WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED, WITH RESPECT TO THE MATTERS
DESCRIBED HEREIN, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR PURPOSE.

LANDLORD:                                   TENANT:

AMB PROPERTY, L.P.                          HARMONIC, INC.
a Delaware limited partnership              a Delaware corporation
By: AMB Property Corporation,
    a Maryland corporation                  By:   /s/ ROBIN N. DICKSON
                                               ---------------------------------
                                                      Robin N. Dickson

By: /s/ JOHN L. ROSSI                       Its: Chief Financial Officer
   --------------------------------             --------------------------------
        John L. Rossi

Its: Regional Manager                       By:
                                               ---------------------------------

                                            Its:
                                                --------------------------------

Telephone: (415)394-9000                    Telephone: (408)542-2661
Facsimile: 415 394-0903                     Facsimile: (408)542-2516

Executed at: 505 Montgomery Street          Executed at: 632 Caribbean Avenue
             6th Floor                      Sunnyvale, CA 94089
             San Francisco, CA 94111

Date: 5/12/00                               Date:
     ------------------------------              -------------------------------

                                       5
<PAGE>   22

                                  EXHIBIT "A"

                                    SITE PLAN

                                                              AMB PROPERTY, L.P.
PROJECT 8J01                                         MBC/MOFFETT BUSINESS CENTER
R & D                                      TOTAL PROJECT SQUARE FOOTAGE: 285,480
--------------------------------------------------------------------------------

                                    [DIAGRAM]

<PAGE>   23

                                    EXHIBIT B

                          COMMENCEMENT DATE CERTIFICATE

        THIS COMMENCEMENT DATE CERTIFICATE is made as of April 18, 2000, by and
between the parties hereto with regard to that Lease dated April 18, 2000, by
and between AMB PROPERTY, L.P., a Delaware limited partnership, as Landlord
("Landlord"), and HARMONIC, INC., a California corporation as Tenant ("Tenant"),
affecting those Premises commonly known as 646 Caribbean Drive, Sunnyvale,
California. The parties hereto agree as follows:

        1. Possession of the Premises has been delivered to Tenant and Tenant
has accepted and taken possession of the Premises.

        2. The Commencement Date of the Lease Term is September 8, 2000 and the
Lease Term shall expire on September 30, 2010 unless sooner terminated according
to the terms of the Lease or by mutual agreement.

        3. The Base Monthly Rent initially due pursuant to the Lease is One
Hundred Seventy-Six Thousand Six Hundred Forty and 00/100 Dollars ($176,640.00)
per month, subject to any subsequent adjustments required by the Lease.

        4. Landlord has received a Security Deposit in the amount of Two Hundred
Sixty-Four Thousand Nine Hundred Sixty and 00/Dollars ($264,960.00). In
addition, Tenant has prepaid rent in the amount of One Hundred Seventy-Six
Thousand Six Hundred Forty and 00/Dollars ($176,640.00), which shall be applied
to the first installment of Base Monthly Rent.

        5. The Lease is in full force and effect, neither party is in default of
its obligations under the Lease, and Tenant has no setoffs, claims, or defenses
to the enforcement of the Lease.

LANDLORD:                                   TENANT:

AMB PROPERTY, L.P.                          HARMONIC, INC.
a Delaware limited partnership              a Delaware corporation
By: AMB Property Corporation,
    a Maryland corporation                  By: /s/ ROBIN N. DICKSON
                                               ---------------------------------
                                                    Robin N. Dickson

By: /s/ JOHN L. ROSSI                       Its: Chief Financial Officer
   --------------------------------             --------------------------------
   John L. Rossi

Its: Regional Manager                       By:
                                               ---------------------------------

                                            Its:
                                                --------------------------------

Telephone: (415)394-9000                       Telephone: (408)542-2661
Facsimile: (415)394-0903                       Facsimile: (408)542-2516
Executed at: 505 Montgomery Street             Executed at: 632 Caribbean Avenue
              6th Floor                        Sunnyvale, CA 94089
              San Francisco, CA 94111

Date: 5/12/00                                  Date:
     ------------------------------                 ----------------------------

                                       1
<PAGE>   24

                                   EXHIBIT "C"
                              IMPROVEMENT AGREEMENT

                                 NOT APPLICABLE

<PAGE>   25

                                   EXHIBIT "D"
                             APPROVED SPECIFICATIONS

                                 NOT APPLICABLE

<PAGE>   26

                                   EXHIBIT "E"
                       DESCRIPTION OF PRIVATE RESTRICTIONS

                                (NOT APPLICABLE)

<PAGE>   27

                                   EXHIBIT "F"
                                  SIGN CRITERIA

                                (NOT APPLICABLE)

<PAGE>   28

                                   EXHIBIT "H"
                                LEGAL DESCRIPTION

                                 NOT APPLICABLE
<PAGE>   29
                                   EXHIBIT I
                             RULES AND REGULATIONS

     This Exhibit sets forth the rules and regulations governing Tenant's use of
the Common Areas and the Premises leased to Tenant pursuant to the terms,
covenants and conditions of the Lease to which this Exhibit is attached. Unless
otherwise defined, capitalized terms used herein shall have the same meanings as
set forth in the Lease. In the event of any conflict or inconsistency between
this Exhibit and the Lease, the Lease shall control.

     1.   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.

     2.   The walls, walkways, sidewalks, entrance passages, courts and
vestibules shall not be obstructed or used for any purpose other than ingress
and egress of pedestrian travel to and from the Premises, and shall not be used
for loitering or gathering, or to display, store or place any merchandise,
equipment or devices, or for any other purpose. The walkways, entrance passages,
courts, vestibules and roof are not for the use of the general public and
Landlord shall in all cases retain the right to control and prevent access
thereto by all persons whose presence in the judgment of the Landlord shall be
prejudicial to the safety, character, reputation and interests of the Building
and its tenants, provided that nothing herein contain shall be construed to
prevent such access to persons with whom Tenant normally deals in the ordinary
course of Tenant's business unless such persons are engaged in illegal
activities. No tenant or employee or invitee of any tenant shall be permitted
upon the roof of the Building.

     3.   No awnings or other projection shall be attached to the outside walls
of the Building. No security bars or gates, curtains, blinds, shades or screens
shall be attached to or hung in, or used in connection with, any window or door
of the Premises without the prior written consent of Landlord. Neither the
interior nor exterior of any windows shall be coated or otherwise sunscreened
without the express written consent of Landlord.

     4.   Tenant shall not in any way deface any part of the Premises or the
Building. Tenant shall not lay linoleum, tile, carpet or other similar floor
covering so that the same shall be affixed to the floor of the Premises in any
manner except as approved by Landlord in writing. The expense of repairing any
damage resulting from a violation of this rule or removal of any floor covering
shall be borne by Tenant.

     5.   The toilet rooms, urinals, wash bowls and other plumbing apparatus
shall not be used for any purpose other than that for which they were
constructed and no foreign substance of any kind whatsoever shall be thrown
therein. The expense of any breakage, stoppage or damage resulting from the
violation of this rule shall be borne by the Tenant.

     6.   Landlord shall direct electricians as to the manner and location of
any future telephone wiring. No boring or cutting for wires will be allowed
without the prior consent of Landlord. The locations of the telephones, call
boxes and other office equipment affixed to the Premises shall be subject to the
prior written approval of Landlord.

                                       1
<PAGE>   30
     7.   No exterior storage shall be allowed at any time without the prior
written approval of Landlord. The Premises shall not be used for cooking or
washing clothes without the prior written consent of Landlord, or for lodging or
sleeping or for any immoral or illegal purposes.

     8.   Tenant shall not make, or permit to be made, any unseemly or
disturbing noises or disturb or interfere with occupants of this or neighboring
buildings or premises or those having business with them, whether by the use of
any musical instrument, radio, phonograph, machinery, or otherwise. Tenant shall
not use, keep or permit to be used, or kept, any foul or obnoxious gas or
substance in the Premises or permit or suffer the Premises to be used or
occupied in any manner offensive or objectionable to Landlord or other occupants
of this or neighboring buildings or premises by reason of any odors, fumes or
gases.

     9.   Neither Tenant nor any of Tenant's Agents shall at any time bring or
keep upon the Premises any toxic, hazardous, inflammable, combustible or
explosive fluid, chemical or substance without the prior written consent of
Landlord.

     10.  No animals shall be permitted at any time within the Premises.

     11.  Tenant shall not use the name of the Building or the Project in
connection with or in promoting or advertising the business of Tenant, except as
Tenant's address, without the prior written consent of Landlord. Landlord shall
have the right to prohibit any advertising by Tenant which uses the name of, or
uses pictures or depictions of, the Building or the Project if such advertising
in Landlord's reasonable opinion, tends to impair the reputation of the Project
or its desirability for its intended uses, and upon written notice from Landlord
Tenant shall refrain from or discontinue such advertising.

     12.  Canvassing, soliciting, peddling, parading, picketing, demonstrating
or otherwise engaging in any conduct that unreasonably impairs the value or use
of the Premises or the Project are prohibited and Tenant shall cooperate to
prevent the same.

     13.  All equipment of any electrical or mechanical nature shall be placed
by Tenant on the Premises in such a way as to best minimize, absorb and prevent
any vibration, noise or annoyance. No equipment of any type shall be placed on
the Premises which in Landlord's opinion exceeds the load limits of the floor or
otherwise threatens the soundness of the structure or improvements of the
Building.

     14.  All furniture, equipment and freight shall be moved in and out of the
Building only at hours and in accordance with rules established by Landlord, and
shall not impair vehicular and pedestrian circulation in the Common Area.
Landlord will not be responsible for loss or damage to any furniture, equipment,
or other personal property of Tenant from any cause.

     15.  No air conditioning unit or other similar apparatus shall be
installed or used by Tenant without the prior written consent of Landlord.

     16.  No aerial antenna shall be erected on tile roof or exterior walls of
the Premises, or on the grounds, without in each instance the prior written
consent of Landlord. Any aerial or antenna so installed by or on behalf of
Tenant without such written consent shall be subject to removal by Landlord at
any time without prior notice at the expense of Tenant, and Tenant shall upon
Landlord's demand pay a reasonable removal fee to Landlord.

                                       2
<PAGE>   31
     17.  The entire Premises, including vestibules, entrances, doors, fixtures,
windows and plate glass, shall at all times be maintained in a safe, neat and
clean condition by Tenant. All trash, refuse and waste materials shall be
regularly removed from the Premises by Tenant and placed in the containers at
the locations designated by Landlord for refuse collection. All cardboard boxes
must be "broken down" prior to being placed in the trash containers. All
styrofoam chips must be bagged or otherwise contained prior to placement in the
trash containers, so as not to constitute a nuisance. Pallets may not be
disposed of in the trash containers or enclosures. The burning of trash, refuse
or waste materials is prohibited.

     18.  All keys for the Premises shall be provided to Tenant by Landlord and
Tenant shall return to Landlord any of such keys so provided upon the
termination of the Lease. Tenant shall not change locks or install other locks
on doors of the Premises without the prior written consent of Landlord, except
for Secure Areas within the Premises. In the event of loss of any keys furnished
by Landlord for Tenant, Tenant shall pay to Landlord the costs thereof.

     19.  No person shall enter or remain within the Project while intoxicated
or under the influence of liquor or drugs. Landlord shall have the right to
exclude or expel from the Project any person who, in the absolute discretion of
Landlord, is under the influence of liquor or drugs.

     Tenant agrees to comply with all of the foregoing Rules and Regulations.
Should Tenant not abide by these Rules and Regulations, Landlord or any
"Operator," "Association" or "Declarant" under any Restrictions may serve a
notice to correct the deficiencies. If Tenant has not corrected the deficiencies
by the end of the notice period set forth in Section 15.1(g) of the Lease,
Tenant will be in default of the Lease, and Landlord and/or its designee shall
have the right, without further notice, to cure the violation at Tenant's
expense.

     Landlord reserves the right to amend or supplement the foregoing Rules and
Regulations and to adopt and promulgate additional reasonable rules and
regulations applicable to the Premises. Notice of such rules and regulations and
amendments and supplements thereto, if any, shall be given to the Tenant.
Notwithstanding anything to the contrary herein or in the Lease, Tenant shall
not be required to comply with any new rules, regulations or restrictions,
unless the same apply generally and non-discriminatorily to the occupants of the
Project, do not unreasonably interfere with Tenant's use of the Premises or
Tenant's parking rights and do not materially increase Tenant's obligations or
decrease Tenant's rights under this Lease.

     Neither Landlord nor Landlord's Agents or any other person or entity shall
be responsible to Tenant or to any other person for the ignorance or violation
of these Rules and Regulations by any other tenant or other person. Tenant shall
be deemed to have read these Rules and Regulations and to have agreed to abide
by them as a condition precedent, waivable only by Landlord, to Tenant's
occupancy of the Premises.

                                       3

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