Document:

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                                 EXHIBIT 10.51

                                LEASE AGREEMENT

                         FOR THE BAKE PARKWAY BUILDING
<PAGE>

                                 OFFICE LEASE

                      FUND VIII AND FUND IX ASSOCIATES, a
                       Georgia joint venture partnership

                                  as Landlord

                                      and

                             QUEST SOFTWARE, INC.,
                           a California corporation

                                   as Tenant

                         Dated as of: June 9/th/, 2000
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                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
<S>                                                                   <C>
ARTICLE 1     REAL PROPERTY, BUILDING AND PREMISES                     1

ARTICLE 2     LEASE TERM                                               1

ARTICLE 3     BASE RENT                                                2

ARTICLE 4     ADDITIONAL RENT                                          2

ARTICLE 5     USE OF PREMISES                                          6

ARTICLE 6     SERVICES AND UTILITIES                                   6

ARTICLE 7     REPAIRS                                                  6

ARTICLE 8     CONDITIONS AND ALTERATIONS                               7

ARTICLE 9     COVENANT AGAINST LIENS                                   8

ARTICLE 10    INSURANCE                                                9

ARTICLE 11    DAMAGE AND DESTRUCTION                                  11

ARTICLE 12    NONWAIVER                                               13

ARTICLE 13    CONDEMNATION                                            13

ARTICLE 14    ASSIGNMENT AND SUBLETTING                               13

ARTICLE 15    SURRENDER OF PREMISES; OWNERSHIP AND REMOVAL OF
              TRADE FIXTURES                                          16

ARTICLE 16    HOLDING OVER                                            16

ARTICLE 17    ESTOPPEL CERTIFICATES                                   17

ARTICLE 18    SUBORDINATION                                           17

ARTICLE 19    DEFAULTS; REMEDIES                                      17

ARTICLE 20    COVENANT OF QUIET ENJOYMENT                             19

ARTICLE 21    FORCE MAJEURE                                           19

ARTICLE 22    ATTORNEYS' FEES                                         20

ARTICLE 23    SIGNS                                                   20

ARTICLE 24    COMPLIANCE WITH LAW                                     21

ARTICLE 25    LATE CHARGES                                            21

ARTICLE 26    LANDLORD'S RIGHT TO CURE DEFAULT; PAYMENTS BY TENANT    21

ARTICLE 27    ENTRY BY LANDLORD                                       22

ARTICLE 28    INTENTIONALLY OMITTED                                   22
</TABLE>
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ARTICLE 29    MISCELLANEOUS PROVISIONS                                22

                                   Exhibits

Exhibit A      Legal Description of Land
Exhibit B      Tenant Improvements
Exhibit C      Direct Expenses Exclusions
Exhibit D      Rules and Regulations
Exhibit E      List of All Recorded Covenants, Conditions and Restrictions
Exhibit F      Form of Tenant's Estoppel Certificate
Exhibit G      Building Signage
<PAGE>

                      SUMMARY OF BASIC LEASE INFORMATION

The undersigned hereby agree to the following terms of this Summary of Basic
Lease Information (the "Summary").  This Summary is hereby incorporated into and
made a part of the attached Office Lease (this Summary and the Office Lease to
be known collectively as the "Lease") which pertains to the office building (the
"Building")located on the real property described in Exhibit A which real
property is in the City of Irvine, California.  Each reference in the Office
Lease to any term of this Summary shall have the meaning as set forth in this
Summary for such term.  In the event of a conflict between the terms of this
Summary and the Office Lease, the terms of the Office Lease shall prevail.  Any
capitalized terms used herein and not otherwise defined herein shall have the
meaning as set forth in the Office Lease.

TERMS OF LEASE                  DESCRIPTION
--------------                  -----------

1.   Dated as of:               June 9/th/, 2000

2.   Landlord:                  FUND VIII AND FUND IX ASSOCIATES,
                                a Georgia joint venture partnership

3.   Address of Landlord        6200 The Corners Parkway, Suite 250
     (Section 29.16):           Norcross, Georgia 30092-2295

4.   Tenant:                    QUEST SOFTWARE, INC.,
                                a California corporation

5.   Address of Tenant          8001 Irvine Center Drive
     (Section 29.16):           Irvine, California 92618
                                Attn: Susan Twellman

6.   Premises (Article 1):      See Exhibit A

7.   Term (Article 2):          Beginning on the date hereof and ending on the
                                last day of the month in which the 42nd monthly
                                anniversary of the Rent Commencement Date occurs

8.   Base Rent (Article 3)      $1.65 per "rentable square feet" per month

     Rent Commencement
     Date:                      The Rent Commencement Date shall be the first to
                                occur of (i) the date Tenant commences business
                                in the Premises, (ii) issuance of a certificate
                                of occupancy or (iii) August 1, 2000, provided
                                that for the six month period beginning with the
                                Rent Commencement Date, Base Rent shall be
                                calculated on the basis of 33,000 "rentable
                                square feet"

9.   Brokers (Section 29.20):   Julien J. Studley, Inc. and Cushman & Wakefield
<PAGE>

                                 OFFICE LEASE

     This Office Lease, which includes the preceding Summary of Basic Lease
Information (the "Summary") attached hereto and incorporated herein by this
reference (the Office Lease and Summary to be known sometimes collectively
hereafter as the "Lease"), dated as of the date set forth in Section 1 of the
Summary, is made by and between FUND VIII AND FUND IX ASSOCIATES, a Georgia
joint venture partnership ("Landlord"), and QUEST SOFTWARE, INC., a California
corporation ("Tenant").

                                   ARTICLE 1
                     REAL PROPERTY, BUILDING AND PREMISES

     1.1  Real Property, Building and Premises.  Upon and subject to the terms,
          ------------------------------------
covenants and conditions hereinafter set forth in this Lease, Landlord hereby
leases to Tenant and Tenant hereby leases from Landlord all of the land
described in Exhibit A hereto (the "Real Property") and all of the improvements
             -------
thereon (the "Improvements"), including the building having an address of 15253
Bake Parkway, Irvine, California (the "Building"), the Real Property,
Improvements and Building being sometimes referred to herein as the "Premises."

     1.2  Rentable Square Feet of Premises and Building.  For purposes of this
          ---------------------------------------------
Lease, "rentable square feet" shall be deemed to be 65,006 for the Premises.

     1.3  Delivery of the Building and Premises; Tenant Improvement Allowance.
          -------------------------------------------------------------------
Landlord will deliver to and Tenant will accept the Premises  "as is, where is,
with all faults". Landlord agrees to provide a tenant improvement allowance of
$11.00 times the "rentable square feet" in the Building in accordance with and
subject to the terms and conditions set forth in Exhibit B hereto (the "Tenant
                                                 -------
Improvements").

                                   ARTICLE 2
                                  LEASE TERM

     2.1  Initial Term.  The terms and provisions of this Lease shall be
          ------------
effective as of the date of this Lease except for the provisions of this Lease
relating to the payment of Rent. The term of this Lease and any validly
exercised option (the "Lease Term") shall be as set forth in Section 7 of the
Summary and Section 2.2 below and shall commence on the date (the "Lease
Commencement Date") set forth in Section 7 of the Summary, and shall terminate
on the date (the "Lease Expiration Date") set forth in Section 7 of the Summary,
unless this Lease is sooner terminated or extended as hereinafter provided. For
purposes of this Lease, the term "Lease Year" shall mean each consecutive twelve
(12) month period, commencing on the Lease Commencement Date unless the context
requires otherwise, during the Lease Term.

     2.2  Option Terms.
          ------------

          2.2.1  Option Rights.  Landlord hereby grants Tenant two (2) options
                 -------------
to extend the Lease Term for all and not less than all of the Premises for a
period of one year each, provided that the second option term shall expire on
December 31, 2005 (the "Option Terms"), which option shall be exercisable only
by written notice delivered by Tenant to Landlord as provided below, provided
that, as of the date of delivery of each of such notices there is not an
outstanding Event of Default by Tenant. Upon the proper exercise of an option to
extend, the Lease Term, as it then applies to the Premises, shall be extended
for a period of one year if the extension relates to the first option period or
until December 31, 2005, if it relates to the second option period. The rights
contained in this Section 2.2 may only be exercised by Tenant, its "Affiliates"
(as defined in Section 14.5 below) or an assignee of Tenant to whom an
assignment of this Lease has been made in accordance with Article 14 (and not
any sublessee or other transferee of Tenant's interest in this Lease).

          2.2.2  Option Rent.  The Base Rent payable by Tenant during the Option
                 -----------
Term (the "Option Rent") shall be calculated at the rate of $1.75 per "rentable
square feet" per month.

          2.2.3  Exercise of Option.  The options contained in this Section 2.2
                 ------------------
shall be exercised by Tenant, if at all, and only in the following manner:
Tenant shall deliver written notice to Landlord (the "Option Notice") not more
than 12 months or less than nine months prior to the expiration of the initial
Lease Term or the initial Option Term, as applicable, stating that Tenant is
exercising its option. Notwithstanding the foregoing, Tenant may extend the time
within which it must deliver the Option Notice to the date which is six months
prior to the expiration
<PAGE>

of the initial Lease Term or the initial Option Term, as applicable, provided
Tenant shall have on or before the date which is nine months prior to such
expiration date delivered to Landlord notice that Tenant is electing to extend
such date by as many as three months in which event the expiration of the
initial Lease Term or Option Term, as applicable, shall be automatically
extended by the same number of months.

                                   ARTICLE 3
                                   BASE RENT

     Commencing on the Rent Commencement Date set forth in Section 8 of the
Summary, Tenant shall pay, without notice or demand, to Landlord or Landlord's
agent at the address set forth in Section 3 of the Summary, or at such other
place in the continental United States as Landlord may from time to time
designate in writing, by check drawn upon a bank located in the United States of
America (for currency which, at the time of payment, is legal tender for private
or public debts in the United States of America), base rent ("Base Rent") as set
forth in Section 8 of the Summary, payable in equal monthly installments as set
forth in Section 8 of the Summary  in advance on or before the first day of each
and every month during the Lease Term, without any setoff or deduction
whatsoever, except as otherwise expressly provided in this Lease.  If any rental
payment date (including any Rent Commencement Date) falls on a day of the month
other than the first day of such month or if any rental payment is for a period
which is shorter than one month, then the rental for any such fractional month
shall be a proportionate amount of a full calendar month's rental based on the
proportion that the number of days in such fractional month bears to the number
of days in the calendar month during which such fractional month occurs.  All
other payments or adjustments required to be made under the terms of this Lease
that require proration on a time basis shall be prorated on the same basis.

                                   ARTICLE 4
                                ADDITIONAL RENT

     4.1  Additional Rent.  In addition to paying the Base Rent specified in
          ---------------
Article 3 of this Lease, beginning on the Rent Commencement Date, Tenant shall
pay as additional rent for each "Expense Year," as that term is defined in
Section 4.2.3 of this Lease, all of the annual "Direct Expenses," as that term
is defined in Section 4.2.2 of this Lease, as if Tenant occupied the entire
Premises.  Such additional rent, together with any and all other amounts payable
by Tenant to Landlord pursuant to the terms of this Lease, shall be hereinafter
collectively referred to as the "Additional Rent."  The Base Rent and Additional
Rent are herein collectively referred to as the "Rent."  All amounts payable
under this Article 4 as Additional Rent shall be payable for the same periods
and in the same manner and place as the Base Rent.  Without limitation on other
obligations which shall survive the expiration of the Lease Term, the
obligations of Tenant and Landlord provided for in this Article 4 shall survive
the expiration of the Lease Term.

     4.2  Definitions.  As used in this Article 4, the following terms shall
          -----------
have the meanings hereinafter set forth:

          4.2.1  "Calendar Year" shall mean each calendar year in which any
portion of the Lease Term falls, through and including the calendar year in
which the Lease Term expires.

          4.2.2  "Direct Expenses" shall mean "Operating Expenses" and "Tax
Expenses."

          4.2.3  "Expense Year" shall mean each Calendar Year.

          4.2.4  "Operating Expenses" shall mean all direct and indirect costs,
expenses, and assessments charged to the Real Property with respect to its
efficient and economical operation (including insurance premiums for the
insurance policies described in Sections 10.2, 10.3 and 10.5 below), management,
use, maintenance and repair, other than those which are set forth in Section 6.1
below.  Operating Expenses shall not include those items set forth on the
Operating Expense Exclusion list attached hereto as Exhibit C.
                                                    -------

          4.2.5  "Tax Expenses" shall mean all federal, state, county, or local
governmental or municipal taxes, fees or other impositions of every kind and
nature, whether general, special, ordinary or extraordinary, (including, without
limitation, real estate taxes, general and special assessments, transit taxes,
leasehold taxes or taxes based upon the receipt of rent, including gross
receipts or sales taxes applicable to the receipt of rent, unless required to be
paid by Tenant, personal property taxes imposed upon the fixtures, machinery,
equipment, apparatus,
<PAGE>

systems and equipment, appurtenances, furniture and other personal property used
in connection with the Building), which are allocable to a particular Expense
Year (without regard to any different fiscal year used by such governmental or
municipal authority) in connection with the ownership, leasing and operation of
the Real Property or Landlord's interest therein.

                 4.2.5.1   Tax Expenses shall include, without limitation:

          (i)    Any governmental tax on Landlord's rent, right to rent or other
incomefrom the Real Property or as against Landlord's business of leasing any of
the Real Property;

          (ii)   Any assessment, tax, fee, levy or charge in addition to, or in
substitution, partially or totally, of any assessment, tax, fee, levy or charge
previously included as of the date hereof within the definition of real property
tax, it being acknowledged by Tenant and Landlord that Proposition 13 was
adopted by the voters of the State of California in the June 1978 election
("Proposition 13") and that assessments, taxes, fees, levies and charges may be
imposed by governmental agencies for such services as fire protection, street,
sidewalk and road maintenance, refuse removal and for other governmental
services formerly provided without charge to property owners or occupants, and,
in further recognition of the decrease in the level and quality of governmental
services and amenities as a result of Proposition 13, Tax Expenses shall also
include any governmental assessments or contribution towards a governmental
cost-sharing agreement for the purpose of augmenting or improving the quality of
services and amenities normally provided by governmental agencies.  It is the
intention of Tenant and Landlord that all such new and increased assessments,
taxes, fees, levies and charges and all similar assessments, taxes, fees, levies
and charges be included within the definition of Tax Expenses for purposes of
this Lease;

          (iii)  Any governmental assessment, tax, fee, levy, or charge
allocable to or measured by the area of the Premises or the rent payable
hereunder, including, without limitation, any gross income tax with respect to
the receipt of such rent; and

          (iv)   Any assessment, tax, fee, levy or charge, upon this transaction
or any document to which Tenant is a party, creating or transferring an interest
or an estate in the Premises.

                 4.2.5.2   With respect to any assessment otherwise includable
within Tax Expenses that may be levied against or upon the Real Property and
that under the laws then in force may be evidenced by improvement or other
bonds, or may be paid in annual installments, there shall be included within the
definition of Tax Expenses with respect to any tax fiscal year only the amount
currently payable on such bonds, including interest, for such tax fiscal year,
or the current annual installment for such tax fiscal year, in each case
utilizing the payment or installment method which will minimize the amount of
Tax Expenses.

                 4.2.5.3   If the method of taxation of real estate prevailing
at the time of execution hereof shall be, or has been, altered so as to cause
the whole or any part of the taxes now, hereafter or heretofore levied, assessed
or imposed on real estate to be levied, assessed, or imposed upon Landlord,
wholly or partially, as a capital levy or otherwise, or on or measured by the
rents received therefrom, then such new or altered taxes attributable to the
Real Property shall be included within the term "Tax Expenses" except that the
same shall not include any enhancement of said tax attributable to other income
of Landlord.

                 4.2.5.4   Landlord may in good faith protest any Tax expenses
with the appropriate governing authorities, and any reasonable expenses
reasonably incurred by Landlord in attempting to protest, reduce or minimize Tax
Expenses shall be included in Tax Expenses in the Expense Year such expenses are
paid, provided that such expenses shall not exceed the savings which may
reasonably be expected to be realized as a result of such action. Landlord shall
endeavor to notify Tenant of any proposed increases in the assessed value of the
Property, and if Landlord elects not to protest any such increase, Tenant shall
have the right to do so.

                 4.2.5.5   Tax refunds shall be deducted from Tax Expenses in
the Expense Year to which the same are attributable.

                 4.2.5.6   Subject to the terms of this Section 4.2.5, if Tax
Expenses for any period during the Lease Term or any extension thereof are
increased after payment thereof by Landlord for any reason, including, without
limitation, error or reassessment by applicable governmental or municipal
authorities, such increase shall be included in Tax Expenses in the Expense Year
to which such increase is attributable, and Tenant shall pay Landlord
<PAGE>

Tenant's share of such increased Tax Expenses to the extent there exists an
excess for such Expense Year.

                 4.2.5.7   Notwithstanding anything to the contrary contained in
this Lease, there shall be excluded from Tax Expenses (i) all excess profits
taxes, franchise taxes, gift taxes, capital stock taxes, inheritance and
succession taxes, estate taxes, federal and state income taxes, and other taxes
to the extent applicable to Landlord's general or net income, (ii) any items
included as Operating Expenses, and (iii) any items paid by Tenant under Section
4.4 of this Lease.

          4.3    Calculation and Payment of Additional Rent.
                 ------------------------------------------

                 4.3.1  Payment of Direct Expenses.  For any Expense Year ending
                        --------------------------
or commencing within the Lease Term, Tenant shall pay directly, or, as
applicable, to Landlord, in the manner set forth in Section 4.3.2, below, and as
Additional Rent, an amount equal to the Direct Expenses for such Expense Year.

                 4.3.2  Statement of Actual Direct Expenses and Payment by
                        --------------------------------------------------
Tenant.  Landlord shall endeavor to give to Tenant on or before the first day of
------
April (and must deliver by July 1) following the end of each Expense Year, a
statement (the "Statement"), certified by an appropriate official of Landlord,
which shall state that portion of the Direct Expenses not directly paid by
Tenant, and which portion is allocable to such preceding Expense Year. Tenant
shall pay, within thirty (30) days after receipt of the Statement, the full
amount of the Landlord-billed Direct Expenses for such Expense Year, less the
amounts, if any, paid during such Expense Year as an "Estimated Payment," as
that term is defined in Section 4.3.3, below. In the event the amount paid by
Tenant as an Estimated Payment exceeds the amount of the Landlord-billed Direct
Expenses, Tenant shall receive a credit against the next payment of Additional
Rent due under this Lease. The failure of Landlord to timely furnish the
Statement for any Expense Year shall not prejudice either party from enforcing
its rights under this Article 4; provided, however, that except with regard to
the recalculation of those items of Direct Expenses which are not under
Landlord's reasonable control, specifically including Tax Expenses and public
utility charges, Landlord shall not be permitted to add to Direct Expenses or
bill for the first time any portion of Direct Expenses more than 13 months
following the last day of the Expense Year to which such Direct Expenses relate.

          Subject to the provisions of this Lease, even though the Lease Term
has expired and Tenant has vacated the Premises, when the final determination is
made of the Direct Expenses for the Expense Year in which this Lease terminates,
(i) if Tenant has not paid all of the Direct Expenses for such Expense Year,
Tenant shall pay to Landlord, within thirty (30) days after receipt of a
reasonably detailed bill therefor, an amount as calculated pursuant to the
provisions of Section 4.3.1 of this Lease, and (ii) if Tenant has made an
overpayment of Additional Rent, Landlord shall pay the same to Tenant within
thirty (30) days of such determination.  The provisions of this Section 4.3.2
shall survive the expiration or earlier termination of the Lease Term.

                 4.3.3  Statement of Estimated Direct Expenses.  In addition,
                        --------------------------------------
Landlord shall endeavor to give Tenant a yearly expense estimate statement (the
"Estimate Statement") on or before the Rent Commencement Date and thereafter
within one hundred twenty (120) days and no later than one hundred eighty (180)
days after the commencement of each new Expense Year, which Estimate Statement
shall set forth Landlord's reasonable estimate (the "Estimate") of what the
total amount of Landlord-billed Direct Expenses for the then-current Expense
Year shall be (the "Estimated Payment"). The failure of Landlord to timely
furnish the Estimate Statement for any Expense Year shall not preclude Landlord
from enforcing its rights to collect any Estimated Payment under this Article 4.
Tenant shall pay, within thirty (30) days of Tenant's receipt of such Estimate
Statement, a fraction of the Estimated Payment for the then-current Expense Year
(reduced by any amounts paid pursuant to the last sentence of this Section
4.3.3). Such fraction shall have as its numerator the number of months which
have elapsed in such current Expense Year to the month of such payment, both
months inclusive, and shall have twelve (12) as its denominator. Until a new
Estimate Statement is furnished, Tenant shall pay monthly, with the monthly Base
Rent installments, an amount equal to one-twelfth (1/12) of the total Estimated
Payment set forth in the previous Estimate Statement delivered by Landlord to
Tenant.

          4.4    Taxes and Other Charges for Which Tenant Is Responsible. Tenant
                 -------------------------------------------------------
shall reimburse Landlord, within thirty (30) days of Tenant's receipt of a
reasonably detailed written demand accompanied by appropriate supporting
evidence (but in any case prior to delinquency), for any and all taxes or
assessments required to be paid by Landlord (except to the extent included in
Tax Expenses by Landlord), excluding state, local and federal personal or
corporate income taxes measured by the net income of Landlord from all sources
and estate and inheritance taxes, whether or not now customary or within the
contemplation of the parties hereto, when said taxes
<PAGE>

are required to be paid by Tenant and said taxes are measured by or reasonably
attributable to the cost of Tenant's equipment, furniture, fixtures and other
personal property located in the Premises, or by the cost of all leasehold
improvements made in or to the Premises by or for Tenant.

          4.5  Landlord's Books and Records; Tenant's Audit Rights.  Tenant or
               ---------------------------------------------------
Tenant's  authorized representatives (the "Outside Agent") may, after reasonable
notice to Landlord and at reasonable times, examine, inspect, audit, and copy
the records of Landlord regarding each Statement at Landlord's office in the
continental United States during normal business hours within one (1) year after
the furnishing of the Statement.  The Outside Agent shall be a nationally or
regionally recognized firm of certified public accountants ("CPA") and shall be
engaged on a non-contingency fee basis.  Unless Tenant takes written exception
to any item within two (2) years after the furnishing of that Statement (or any
corrected Statement), the Statement shall be considered as final and accepted by
Tenant except that Landlord may, at any time during that two-year period, submit
a corrected Statement to Tenant if Operating Expenses and Tax Expenses on the
original Statement were overstated or understated.

          The payment of the amounts shown on the Statement by Tenant shall not
preclude Tenant from questioning the correctness of any item of the Statement
subject to the rights in this Section 4.5, and Tenant shall continue to pay the
amounts reflected on the Statement pending a final determination of the
correctness of the items shown thereon.  Tenant and/or its Outside Agent shall
have the right, at Tenant's cost and on no less than ten (10) days' prior
written notice to Landlord and during Landlord's normal business hours, to audit
Landlord's records regarding Operating Expenses and Tax Expenses.  Such an Audit
shall be performed in Landlord's office in the continental United States.

          To facilitate an audit by Tenant, Landlord shall keep its books and
records applicable to Operating Expenses and Tax Expenses available to Tenant on
a reasonable basis for the longer of (a) two (2) years after the Lease
Expiration Date or (b) one (1) year after the resolution of any dispute
concerning Operating Expenses and Tax Expenses.  Any audit of Operating Expenses
and Tax Expenses for any calendar year must be begun within two (2) years after
Landlord's delivery of the Statement for that year, or the right to audit
Operating Expenses and Tax Expenses for that year shall be deemed waived.

          Tenant agrees diligently to pursue and complete (or to drop) any audit
begun by Tenant, and Landlord agrees it shall not unreasonably interfere with
the execution of Tenant's audit rights.  Landlord shall either accept or reject
any such audit within 30 days of the receipt of same. If Landlord shall reject
such audit and the parties cannot otherwise agree on any adjustments, then
Landlord and Tenant shall select a mutually acceptable accounting firm to
conduct such audit, the results of which shall be binding upon the parties. The
cost of such audit shall be borne equally by the parties, and Tenant shall bear
all fees and costs of its audit, unless it is ultimately determined that
Operating Expenses and Tax Expenses taken as a whole for any calendar year were
overstated by four percent (4%) or more.  In that event, Landlord shall pay for
the reasonable costs of both audits.  Pending resolution of any disputes over
Operating Expenses and Tax Expenses, Tenant shall pay to Landlord any Additional
Rent alleged to be due from Tenant as reflected on Landlord's Statement or any
invoice issued on the basis of Landlord's Statement.

                                   ARTICLE 5
                                USE OF PREMISES

          5.1  Permitted Use. Tenant shall use the Premises for general office
               -------------
and administrative purposes only.

          5.2  Prohibited Uses.  Tenant shall not use the Premises or any part
               ---------------
thereof for any use or purpose contrary to the provisions of the Rules and
Regulations listed in Exhibit D and those certain covenants, conditions and
                      -------
restrictions listed on Exhibit E (the "CC&Rs"). This Lease is subject in all
                       -------
respects to the CC&Rs and the Bylaws of the "Associations" established under the
CC&Rs. Landlord is not aware of any violations of the CC&Rs. Tenant shall comply
with the recorded covenants, conditions and restrictions now or (so long as no
negative impact affects the Premises or Tenant's occupancy of the Premises or
restricts in any material way its rights under the Lease) hereafter affecting
the Premises and with all reasonable rules adopted from time to time by the
Associations established under the CC&Rs.  Tenant shall not use or allow another
person or entity to use any part of the Premises for the storage, treatment,
manufacture or sale of "Hazardous Material" as that term is defined in Section
29.24 of this Lease, other than as may be permitted by, and used in accordance
with, all applicable laws, regulations and ordinances pertaining to the
Premises.
<PAGE>

                                   ARTICLE 6
                            SERVICES AND UTILITIES

            6.1  In General.  From and after the date of this Lease, Tenant will
                 ----------
be responsible, at its sole cost and expense, for the furnishing of all services
and utilities to the Premises, including, but not limited to heating,
ventilation and air-conditioning, electricity, water, telephone, janitorial and
security services, window washing and landscaping services. Landlord represents
that to the best of its knowledge all such utilities are available to the
Premises and may be utilized by Tenant without the payment of any hook up or
similar charges other than customary deposits.

     6.2    Interruption of Use.  Tenant agrees that except with respect to
            -------------------
Landlord's gross negligence or intentional acts, Landlord shall not be liable
for damages, by abatement of Rent or otherwise, for failure of Tenant to receive
any service (including telephone and telecommunication services) or utility for
any reason whatsoever, or for any diminution in the quality or quantity thereof,
and such failures or delays or diminution shall never be deemed to constitute an
eviction or disturbance of Tenant's use and possession of the Premises or
relieve Tenant from paying Rent or performing any of its obligations under this
Lease, except as provided in this Lease to the contrary.  Furthermore, Landlord
shall not be liable under any circumstances for a loss of, or injury to,
property or for injury to, or interference with, Tenant's business, including,
without limitation, loss of profits, however occurring, through or in connection
with or incidental to any such failure of Tenant to receive any services or
utilities.

     6.3    No Obligation.  Landlord shall have no obligation to provide any
            -------------
services or utilities to the Premises including, but not limited to heating,
ventilation and air-conditioning, electricity, water, telephone, janitorial and
security services, window washing and landscaping services. Landlord represents
that to the best of its knowledge all Building systems are in proper working
order.

                                   ARTICLE 7
                                    REPAIRS

     7.1    Tenant's Obligations.
            --------------------

            7.1.1  Tenant Required Actions. Subject to the provisions of Section
                   -----------------------
7.2, Articles 11 and 13 and Section 29.29, Tenant shall, at Tenant's sole cost
and expense, operate, keep, and maintain, and as necessary, repair, restore,
replace, and make any capital improvements to (collectively, the "Tenant
Required Actions") (i) the structural portions of the Building (excluding the
structural skeleton of the Building described in Section 7.2 below), including
the ceilings, floor surface, interior walls and wall covering, shafts, stairs,
parking areas, stairwells, elevator cabs, washrooms, and Building mechanical,
electrical and telephone closets (collectively, "Building Structure"), and (ii)
the Building mechanical, electrical, gas, life safety, plumbing, sprinkler
systems, elevators, restrooms, and heating, ventilation and air-conditioning
systems (the "Building Systems"), in good order and repair and in good and safe
working order and condition at all times during the Lease Term, including any
items of the Building Structure or Building Systems included in the "Tenant
Improvements", as that term is defined in Section 1.3, or "Alterations", as that
term is defined in Section 8.1 (collectively, the "Tenant Maintenance Items").
All repairs and maintenance of the Premises by Tenant as required under this
Lease shall be performed in a good and safe manner by contractors and other
personnel reasonably approved by Landlord, and in compliance with the provisions
of Article 8 below.  Notwithstanding the foregoing or any other provision of
this Lease to the contrary, in the event any of the Tenant Required Actions
involve expenditures which would be capitalized under generally accepted
accounting principles, then Landlord shall reimburse Tenant for such
expenditures within 30 days of the request therefor accompanied by supporting
invoices. Tenant shall also be obligated to pay, as an Operating Expense, the
cost of any capital improvements  made by Landlord to all or any portion of the
Premises after the Lease Commencement Date which are required for Tenant's use
of the Premises under any governmental law or regulation which was not
applicable as of the date of commencement of construction of the Building by
Landlord or any capital expenditures reimbursed to Tenant pursuant to the
preceding sentence; provided, however, that each such capital expenditure shall
be amortized (including interest on the unamortized cost at Landlord's then
current cost of funds) over its useful life as Landlord shall reasonably
determine, provided, however, that Tenant shall not be responsible for such
amortization payments to the extent that the capital expenditure was for an item
as to which Landlord is solely responsible under the provisions of Section 7.2
below.

     7.1.2  Maintenance Contracts.  As a part of Tenant's Required Actions,
            ---------------------
Tenant shall, at Tenant's sole cost and expense, maintain contracts for the
inspection, maintenance and service of the (i) heating, air conditioning and
<PAGE>

ventilation equipment, (ii) boiler, fired or unfired pressure vessels, (iii)
fire sprinkler and/or standpipe and hose or other automatic fire extinguishing
systems, including fire alarm and/or smoke detection, and (iv) electrical
systems.

     7.2  Landlord's Obligations.  It is intended by the parties hereto that
          ----------------------
Landlord have no obligation, in any manner whatsoever, to take any of the Tenant
Required Actions with respect to the Building Systems or Building Structure,
except as set forth in this Section 7.2, below.  It is the intention of the
parties that the terms of this Lease govern the respective obligations of the
parties as to maintenance and repair of the Premises.  Tenant waives the right
to make repairs at the expense of Landlord or to terminate this Lease by reason
of any needed repairs under Sections 1941 and 1942 of the California Civil Code,
or any similar law, statute, or ordinance, now or hereafter in effect.
Notwithstanding the foregoing, during the Lease Term, Landlord shall maintain
and repair at its sole cost and expense the structural skeleton of the Building
consisting only of the floor slabs, foundation, roof structure, roof membrane,
exterior walls and exterior glass and mullions ("Landlord Maintenance Items").

                                   ARTICLE 8
                          CONDITIONS AND ALTERATIONS

     8.1  Landlord's Consent to Alterations.  Tenant may, without the need to
          ---------------------------------
obtain the consent or approval of Landlord, make any improvements, alterations,
additions or changes to the Premises the cost of which does not exceed
$30,000.00 (exclusive of wall or floor coverings) in the aggregate
(collectively, the "Alterations") desired by Tenant which do not create a Design
Problem, by providing Landlord with written notice not less than six (6)
business days prior to the commencement thereof.  For purposes of this Lease,
"Design Problem" shall mean any alteration, repair, modification, or improvement
by Tenant which (a) materially or adversely affects the Building Systems or
Building Structure, (b) is not in compliance with applicable laws, or (c)
affects the exterior appearance of the Building.  Tenant may not make any
Alteration which may create a Design Problem (collectively, "Consent
Alterations"), without first procuring the prior written consent of Landlord to
such Alterations, which consent shall be requested by Tenant not less than ten
(10) business days prior to the commencement thereof, and which consent shall
not be unreasonably withheld by Landlord and shall state whether the consent
alterations must be removed on termination of the Lease; provided if the Design
Problem materially or adversely affects the Building System or Building
Structure, then Landlord may condition its consent upon Tenant assuring that the
proposed Alteration complies with applicable Laws and complies with other
conditions that Landlord may reasonably require of Tenant.  In the event Tenant
proposes to make a Consent Alteration, Tenant's notice regarding the proposed
Alteration shall include the plans and specifications for the Alterations.
Landlord shall grant or withhold its consent to any Consent Alterations within
ten (10) business days of receipt of Tenant's notice; Landlord's failure to
respond within three (3) business days after receipt by Landlord of a second
notice given after such ten (10) business day period shall be deemed to evidence
Landlord's approval with respect to the same.

     8.2  Manner of Construction.  In connection with the making of Alterations,
          ----------------------
except for minor or purely cosmetic Alterations such as painting or replacement
of wall or floor covering ("Finish Work"), Tenant shall utilize only contractors
and subcontractors who normally and regularly perform similar work in Comparable
Buildings, or which have been otherwise approved by Landlord, which approval
shall not be unreasonably withheld or delayed.  Subject to the terms of Article
24, below, Tenant shall construct all Alterations in conformance with any and
all applicable rules and regulations of any federal, state, county or municipal
code or ordinance and, when required pursuant to applicable Law, pursuant to a
valid building permit issued by the City of Irvine.  Landlord's approval of the
plans, specifications and working drawings for Tenant's Alterations shall create
no responsibility or liability on the part of Landlord for their completeness,
design sufficiency, or compliance with all laws, rules and regulations of
governmental agencies or authorities.  All work with respect to any Alterations
must be done in a good and workmanlike manner and diligently prosecuted to
completion.  Upon completion of any Alterations, Tenant agrees to cause a Notice
of Completion to be recorded in the office of the Recorder of Orange County in
accordance with Section 3093 of the Civil Code of the State of California or any
successor statute, and, except as to Finish Work, Tenant shall deliver to
Landlord a reproducible copy of the construction set of drawings of the
Alterations (or, at Tenant's election, a copy of the final working drawings for
such Alterations, with field changes shown thereon) within thirty (30) days
following completion thereof.

     8.3  Construction Insurance.  Prior to the commencement of any Alteration,
          ----------------------
Tenant shall provide Landlord with reasonable evidence that Tenant or Tenant's
contractors carries "Builder's All Risk" insurance and worker's compensation
insurance in a commercially reasonable amount (but not less than $1,000,000 of
commercial general liability)  given the scope of such Alterations, covering the
construction of such Alterations, it being understood and agreed that all of
such Alterations shall be insured by Tenant pursuant to Article 10 of this Lease
<PAGE>

immediately upon completion thereof.  In addition, Landlord may, in its
discretion, require any "Transferee," as that term is defined in Section 14.1,
below, other than any Affiliate, to obtain a lien and completion bond or some
alternate form of security satisfactory to Landlord in an amount sufficient to
ensure the lien-free completion of such Alterations and naming Landlord as a co-
obligee.

     8.4   Landlord's Property.  Subject to the terms of this Lease, all
           -------------------
Alterations, improvements, fixtures and/or equipment which may be installed or
placed in or about the Premises, from time to time, shall be at the sole cost of
Tenant and shall be and become the property of Landlord, except that Tenant
shall have the right to remove any such Alterations, not attached or built into
the Premises and trade fixtures which Tenant can reasonably substantiate to
Landlord have not been paid for with any tenant improvement allowance funds
provided to Tenant by Landlord, together with any non-affixed personal property
in the Premises and Tenant's "tele-data" equipment, provided Tenant repairs any
damage to the Premises and Building caused by such removal.  Upon the expiration
or early termination of the Lease Term, Landlord may, by written notice to
Tenant, require Tenant at Tenant's expense to remove any improvements in the
Premises, including any cabling and wiring, Alterations and Tenant Improvements
with respect to which Landlord designated, in its approval of the plans and
specifications for such Alterations and Tenant Improvements , that the same are
to be removed at the end of the Term of the Lease, and repair any damage to the
Premises and Building caused by such removal, and leave the Premises in a broom-
clean condition.  If Tenant fails to complete such removal and/or to repair any
damage caused by the removal of any such improvement, after notice to Tenant
from Landlord, and a reasonable opportunity (based on the then current
circumstances) for Tenant to complete such removal and/or repair, Landlord may
do so and may charge the cost thereof to Tenant.

                                   ARTICLE 9
                            COVENANT AGAINST LIENS

     Tenant has no authority or power to cause or permit any lien or encumbrance
of any kind whatsoever, whether created by act of Tenant, operation of law or
otherwise, to attach to or be placed upon the Real Property, Building or
Premises, and any and all liens and encumbrances created by Tenant shall attach
to Tenant's interest only.  Landlord shall have the right at all times to post
and keep posted on the Premises customary notices of non-responsibility which it
deems necessary for protection from such liens.  Tenant covenants and agrees not
to suffer or permit any lien of mechanics or materialmen or others to be placed
against the Real Property, the Building or the Premises with respect to work or
services claimed to have been performed for or materials claimed to have been
furnished to Tenant or the Premises, and, in case of any such lien attaching or
notice of any such lien, Tenant covenants and agrees to cause it to be
immediately released and removed of record or to protest such lien by filing a
bond  within ten (10) business days after notice by Landlord, and if Tenant
shall fail to do so Landlord, at its sole option, may, after an additional five
(5) business days notice to Tenant, take all action necessary to release and
remove such lien, without any duty to investigate the validity thereof, and all
sums, costs and expenses, including reasonable attorneys' fees and costs,
incurred by Landlord in connection with such lien shall be deemed Additional
Rent under this Lease and shall be due and payable by Tenant within thirty (30)
days of receipt of an invoice therefor.

                                  ARTICLE 10
                                   INSURANCE

     10.1  Indemnification and Waiver.
           --------------------------

           10.1.1  Waiver.  Tenant hereby assumes all risk of damage to property
                   ------
or injury to persons in or upon the Premises from any cause whatsoever and
agrees that Landlord, its partners and their respective officers, agents,
servants, and employees (collectively, the "Landlord Parties") shall not be
liable for any damage either to person or property or resulting from the loss of
use thereof, which damage is sustained by Tenant or by other persons claiming
through Tenant, except to the extent caused by the gross negligence or wilful
misconduct of the Landlord Parties, subject to the provisions of Section 10.4
hereof.

           10.1.2  Tenant's Indemnity.  Tenant shall indemnify, defend, protect,
                   ------------------
and hold harmless Landlord and the Landlord Parties from any and all claims,
loss, cost, damage, expense and liability (including without limitation court
costs and reasonable attorneys' fees) (collectively, "Claims") incurred in
connection with or arising from (1) any cause in or on the Premises during the
Lease Term or any holdover period and (2) subject to the terms of the last
sentence of Section 10.1.3, below, any acts or omissions or wilful misconduct of
Tenant or any person
<PAGE>

claiming by, through or under Tenant, its partners, and their respective
officers agents, servants or employees of Tenant or any such person
(collectively, "Tenant Parties"), in or on or about the Premises or the Real
Property either prior to, during, or after the expiration of the Lease Term,
provided that, except as set forth below, the terms of the foregoing indemnity
shall not apply to the extent such Claims arise from (a) the gross negligence,
intentional acts or wilful misconduct of the Landlord Parties in connection with
the Landlord Parties' activities in, on or about the Real Property, including
the Premises, subject to the provisions of Section 10.4 hereof, or (b)
environmental conditions existing prior to the date hereof. Notwithstanding the
foregoing, because Tenant must carry insurance pursuant to Section 10.3.2,
below, to cover its personal property and all office furniture, trade fixtures,
office equipment and merchandise within the Premises and the Tenant Improvements
and Alterations, Tenant hereby agrees to protect, defend, indemnify and hold
Landlord harmless from any Claim with respect to any such property within the
Premises, to the extent such Claim is covered by Tenant's insurance, even if
resulting from the negligence or wilful misconduct of the Landlord Parties.

           10.1.3  Landlord's Indemnity.  Landlord shall indemnify, defend,
                   --------------------
protect, and hold harmless Tenant and the Tenant Parties from any Claims
incurred in connection with or arising from (1) any cause in or about the Real
Property during the Lease Term (to the extent covered by Landlord's commercial
general liability insurance policies carried pursuant to the terms of Section
10.2 below), or (2) any negligent acts or omissions or wilful misconduct of any
of the Landlord Parties in, on, or about the Premises or the Real Property
(subject to the terms of the last sentence of Section 10.1.2, above), either
prior to, during, or after the expiration of the Lease Term, provided that,
except as set forth below, the terms of the foregoing indemnity shall not apply
to the extent such Claims arise from the negligence or wilful misconduct of the
Tenant Parties in connection with the Tenant Parties' activities in, on, or
about the Real Property.  Notwithstanding the foregoing, because Landlord is
required to maintain pursuant to the terms of Section 10.2, below, insurance on
the Building and Real Property and Tenant compensates Landlord for such
insurance as part of Operating Expenses, Landlord hereby agrees to protect,
defend, indemnify and hold Tenant harmless from any Claims with respect to the
Building and Landlord's equipment and property on the Real Property to the
extent such Claim is covered by Landlord's insurance (or would have been covered
by insurance Landlord is obligated to provide hereunder), even if resulting from
the negligent acts or wilful misconduct of the Tenant Parties.

           10.1.4  Waiver of Consequential Damages. Notwithstanding any contrary
                   -------------------------------
provision of this Lease, neither Landlord nor Tenant shall be liable to the
other party for any consequential damages for a breach or default under this
Lease (excluding fraud or wilful misconduct), provided that this sentence shall
not be applicable to any consequential damages which may be incurred by the
Landlord Parties relating to or in connection with any holdover by Tenant
following the expiration of the Lease Term, subject to and in accordance with
the provisions of Article 16 hereof.

           10.1.5  General Terms.  The provisions of this Section 10.1 shall
                   -------------
survive the expiration or sooner termination of this Lease with respect to any
claims or liability occurring prior to such expiration or termination.

     10.2  Landlord's Insurance.  Landlord shall maintain during the Lease Term
           --------------------
commercial general liability insurance, "all-risk" insurance insuring the
Building against loss or damage due to fire and other casualties covered within
the classification of fire and extended coverage, vandalism coverage and
malicious mischief, sprinkler leakage, water damage, earthquake and special
extended coverage.  Such coverage shall be written for one hundred percent
(100%) of the replacement cost value of the Building, without deduction for
depreciation, and shall be from such companies, and on such other terms and
conditions as Landlord may from time to time reasonably determine.  Such
insurance coverage shall also include a rental loss endorsement (12 months)and
one or more loss payee endorsements in favor of the holders of any mortgages or
deeds of trust encumbering the interest of Landlord in the Real Property or the
ground or underlying lessors of the Real Property, or any portion thereof.  Such
policy shall also contain a "stipulated value" endorsement deleting any co-
insurance provisions.  Notwithstanding the foregoing provisions of this Section
10.2, the coverage and amounts of insurance carried by Landlord in connection
with the Building shall at a minimum be comparable to the coverage and amounts
of insurance which are carried by institutional landlords of Comparable
Buildings.  Landlord shall also carry Worker's Compensation and Employee's
Liability coverage as required by applicable law.  Upon inquiry by Tenant, from
time to time, Landlord shall inform Tenant of all such insurance carried by
Landlord and provide Tenant with certificates relating thereto.  Tenant shall,
at Tenant's expense, comply as to the Premises with all customary insurance
company requirements pertaining to the use of the Premises to the extent
consistent with the insurance company requirements imposed at the Comparable
Buildings.  If Tenant's conduct or use of the Premises other than for the uses
permitted under Section 5.1 of this Lease causes any increase in the premium for
such insurance policies, then Tenant shall, following notice from Landlord
either (i) cease such conduct or use, or (ii) reimburse Landlord for any such
increase. Tenant, at Tenant's expense, shall comply with all rules, orders,
regulations or requirements of the
<PAGE>

American Insurance Association (formerly the National Board of Fire
Underwriters) and with any similar body to the extent consistent with the rules,
orders, regulations or requirements imposed at the Comparable Buildings.
Landlord may carry earthquake and flood insurance with a deductible of not less
than five percent (5%) of the replacement value of the Building at the time of
loss and not more than the amount of deductible then customarily maintained
under similar insurance with respect to Comparable Projects, and Tenant will
reimburse Landlord for the premium cost thereof.

     10.3  Tenant's Insurance.  Tenant shall maintain the following coverages in
           ------------------
the following amounts.

          10.3.1  Commercial General Liability Insurance covering the insured
against claims of bodily injury, personal injury and property damage arising out
of Tenant's operations or use of the Premises, including a Broad Form Commercial
General Liability endorsement covering the insuring provisions of this Lease and
covering the performance by Tenant of the indemnity agreements set forth in
Section 10.1 of this Lease, for limits of liability not less than:

     Bodily Injury and
     Property Damage Liability     $5,000,000 each occurrence
                                   $5,000,000 annual aggregate

     Personal Injury Liability     $5,000,000 each occurrence
     $5,000,000 annual aggregate

          10.3.2  "All-Risk" Insurance, with commercially reasonable
deductibles, covering (i) all office furniture, trade fixtures, office
equipment, merchandise and all other items of Tenant's property on the Premises
installed by, for, or at the expense of Tenant, (ii) the Tenant Improvements,
and (iii) all other improvements, alterations and additions to the Premises,
including any improvements, alterations or additions installed at Tenant's
request above the ceiling of the Premises or below the floor of the Premises.
Such insurance shall be written for the full replacement cost value, new,
without deduction for depreciation, of the covered items and in amounts that
meet any co-insurance clauses of the policies of insurance and may include, at
Tenant's sole option, a vandalism and malicious mischief endorsement, and
sprinkler leakage coverage.

          10.3.3  Form of Policies.  The minimum limits of policies of liability
                  ----------------
insurance required of Tenant or Landlord under this Lease shall in no event
limit the liability of Tenant or Landlord under this Lease.  Each party's
insurance shall (i) name the other party (including, as to Landlord, the
"Lender," as described in Article 18 below), as an additional insured; (ii)
specifically cover the indemnity obligations of the insuring party set forth in
Section 10.1 of this Lease to the extent customarily and commercially available;
(iii) be issued by an insurance company having a rating of not less than B+/VII
in Best's Insurance Guide or which is otherwise reasonably acceptable to the
named party and licensed to do business in the State of California; (iv) be
primary insurance as to all claims thereunder and provide that any insurance
carried by the named party is not excess and is non-contributing with any
insurance requirement of the insuring party; and (v) contain a cross-liability
endorsement or severability of interest clause acceptable to the named party.
The insuring party shall cause its insurance carrier to provide that said
insurance carrier shall give thirty (30) days' (or ten days' in the event of
nonpayment of the premium) prior written notice to the named party and any
mortgagee or ground or underlying lessor of the named party prior to the date
said insurance is canceled.  The parties agree that the insuring party may
satisfy its insurance requirements herein with a "blanket" or "umbrella"
insurance policy covering the Premises and other premises of the insuring party.
The insuring party shall deliver said policy or policies or certificates thereof
to the named party on or before the date that Tenant first enters the Premises
for purposes of performing any work or installing any of its fixtures, equipment
or personal property and at least thirty (30) days before the expiration dates
thereof.  In the event the insuring party shall fail to procure such insurance,
or to deliver such policies or certificate at least thirty (30) days before the
expiration dates thereof, the named party may, at its option, if such failure
continues for ten (10) business days following written notice to the insuring
party, procure such policies for the account of the insuring party, and the cost
thereof shall be paid to the named party as Additional Rent within thirty (30)
days after delivery to the insuring party of bills therefor.

     10.4  Subrogation.  Landlord and Tenant agree to have their respective
           -----------
insurance companies issuing property damage insurance waive any rights of
subrogation that such companies may have against Landlord or Tenant, as the case
may be.  Landlord and Tenant hereby waive any right that either may have against
the other on account of any loss or damage to their respective property to the
extent such loss or damage is insurable under the
<PAGE>

types of policies of insurance set forth in Sections 10.2 and 10.3.2, above.

     10.5  Additional Insurance Obligations.  Tenant shall carry and maintain
           --------------------------------
during the entire Lease Term, at Tenant's sole cost and expense, such increased
amounts of the insurance required to be carried by Tenant pursuant to this
Article 10, and such other reasonable types of insurance coverage (exclusive, as
to insurance required under the provisions of Section 10.3, of earthquake and
flood insurance) and in such reasonable amounts covering the Premises and
Tenant's operations therein, as may be reasonably requested by Landlord;
provided that such requests shall be consistent with the treatment of comparable
tenants in the Comparable Buildings.

                                   ARTICLE 11
                             DAMAGE AND DESTRUCTION

     11.1  Repair of Damage to Premises by Landlord.  Except in the case where
           ----------------------------------------
Landlord or its agents are already aware of the same, Tenant shall notify
Landlord of any material damage to the Premises resulting from fire or any other
casualty promptly following the date Tenant becomes aware of such damage.  If
the Building or Premises shall be damaged by fire or other casualty, Landlord
shall promptly and diligently, subject to reasonable delays for insurance
adjustment or other matters beyond Landlord's reasonable control, and subject to
all other terms of this Article 11, restore the Building, the Building Structure
and Building Systems, except for those items which were constructed by or for
the benefit of Tenant above and beyond the Tenant Improvement Allowance (the
"Base, Shell and Core").  Such restoration shall be to substantially the same
condition of the Base, Shell and Core prior to the casualty, except for
modifications required by zoning and building codes and other laws.
Notwithstanding any other provision of this Lease, upon the occurrence of any
damage to the Premises, Tenant shall assign to Landlord (or to any party
designated by Landlord) all insurance proceeds payable to Tenant under Tenant's
insurance required under items (ii) and (iii) of Section 10.3.2 of this Lease,
and Landlord shall repair any injury or damage to the property covered by the
proceeds being assigned.  Except as provided below with respect to the
termination of the Lease, if the cost of restoration of the Base, Shell and Core
shall exceed the amount of insurance proceeds scheduled to be received by
Landlord from Landlord's casualty, earthquake and/or flood insurance due to the
deductible amounts under such insurance (which deductible amounts shall not be
in excess of commercially reasonable amounts for Comparable Buildings), Tenant
shall pay such shortfall (not to exceed the deductible amounts permitted under
this Lease or in the event of earthquake damage, the first $150,000 of such
deductible amount during the Initial Term or the first $159,000 during any
Option Terms) to Landlord prior to Landlord's repair of the damage to the Base,
Shell and Core. If the cost of such repair to the Tenant Improvements by
Landlord is estimated, after review of the costs by Tenant, to exceed the amount
of insurance proceeds scheduled to be received by Landlord from Tenant's
insurance carrier, as assigned by Tenant, Tenant shall pay any such short fall
to Landlord prior to Landlord's repair of the damage. In the event this Lease
shall terminate as a result of such damage, (i) Tenant shall assign to Landlord
the right to receive any insurance proceeds received from Tenant's insurance
carrier related to the Tenant Improvements constructed utilizing the proceeds of
the Tenant Improvement Allowance, and (ii) Tenant shall retain the insurance
proceeds related to those of the Tenant Improvements which were constructed
utilizing funds provided by Tenant over and above the Tenant Improvement
Allowance.  Tenant shall retain all insurance proceeds related to Tenant's
personal property, furniture, fixtures and equipment.  In connection with such
repairs and replacements, Tenant shall, prior to the commencement of
construction of the Tenant Improvements, submit to Landlord, for Landlord's
review and approval, which approval shall not be unreasonably withheld,
conditioned, or delayed, all plans, specifications and working drawings relating
thereto, and Tenant shall have the right to alter the design of the previously
existing Tenant Improvements, provided that such redesign shall not delay the
repairs and restoration, and Tenant shall select the contractors to perform such
improvement work; provided, however, that Landlord shall have the right to
approve the contractor and the primary subcontractors relating to the Tenant
Improvements, which approval shall not be unreasonably withheld, conditioned or
delayed.  Landlord shall not be liable for any inconvenience or annoyance to
Tenant or its visitors, or injury to Tenant's business resulting in any way from
such damage or the repair thereof. Rent shall abate if and to the extent rental
loss insurance is being  received by Landlord or would have been so received if
Landlord had obtained insurance which it is required to obtain under this Lease.

11.2 Right To Terminate.  Notwithstanding the terms of Section 11.1 of this
     ------------------
Lease, Landlord may elect not to rebuild and/or restore the Premises and/or
Building and/or Real Property and instead terminate this Lease by notifying
Tenant in writing (the "Landlord Termination Notice") of such termination within
sixty (60) days after the date of Landlord's discovery of damage (the "Damage
Date"), such notice to include a termination date giving Tenant ninety (90) days
to vacate the Premises, but Landlord may so elect only if the Premises, Building
and/or Real Property shall be damaged by fire or other casualty or cause,
whether or not the Premises are affected, and one or
<PAGE>

more of the following conditions is present: (i) repairs cannot reasonably be
completed within 225 days of the Damage Date (when such repairs are made without
the payment of overtime or other premiums); (ii) the cost of the damage exceeds
$1,000,000.00 or is not covered by Landlord's insurance policies, or (iii) the
holder of any mortgage on the Building or Real Property shall require (based on
such holder's legal right to so require for reasons other than a default by
Landlord under said mortgage) that the insurance proceeds or any portion thereof
be used to retire the mortgage debt and the remaining proceeds are not
sufficient to repair the damage, provided that in such instance, Landlord agrees
to negotiate in good faith with said holder to have the proceeds applied to
restoration. Likewise, Tenant may elect to terminate this Lease by notifying
Landlord in writing of such termination within sixty (60) days after the Damage
Date, such notice to include a termination date effective as of the date of the
notice, but Tenant may so elect only if the Premises, Building and/or Real
Property shall be damaged by fire or other casualty or cause, whether or not the
Premises are affected, and repairs cannot reasonably be completed within 225
days of the Damage Date (when such repairs are made without the payment of
overtime or other premiums).

     11.3  Waiver of Statutory Provisions.  The provisions of this Lease,
           ------------------------------
including this Article 11, constitute an express agreement between Landlord and
Tenant with respect to any and all damage to, or destruction of, all or any part
of the Premises, the Building or the Real Property, and any statute or
regulation of the State of California, including, without limitation, Sections
1932(2) and 1933(4) of the California Civil Code, with respect to any rights or
obligations concerning damage or destruction in the absence of an express
agreement between the parties, and any other statute or regulation, now or
hereafter in effect, shall have no application to this Lease or any damage or
destruction to all or any part of the Premises, the Building or the Real
Property.

                                   ARTICLE 12
                                   NONWAIVER

     No waiver of any provision of this Lease shall be implied by any failure of
either party to enforce any remedy on account of the violation of such
provision, even if such violation shall continue or be repeated subsequently,
any waiver by either party of any provision of this Lease may only be in
writing, and no express waiver shall affect any provision other than the one
specified in such waiver and that one only for the time and in the manner
specifically stated.  No receipt of monies by Landlord from Tenant after the
termination of this Lease shall in any way alter the length of the Lease Term.

                                   ARTICLE 13
                                  CONDEMNATION

     13.1  Permanent Taking.  If the whole or any part of the Premises or
           ----------------
Building shall be taken by power of eminent domain or condemned by any competent
authority for any public or quasi-public use or purpose, or if any adjacent
property or street shall be so taken or condemned, or reconfigured or vacated by
such authority in such manner as to require the use, reconstruction or
remodeling of any part of the Premises or Building, or if Landlord shall grant a
deed or other instrument in lieu of such taking by eminent domain or
condemnation (collectively, a "Taking"), and if such Taking involves a Taking of
all or substantially all of the Premises, Landlord shall have the option to
terminate this Lease upon delivery of ninety (90) days' notice.  If more than
twenty-five percent (25%) of the rentable square feet of the Premises is taken,
Tenant shall have the option to terminate this Lease upon delivery of ninety
(90) days' notice, provided such notice is given no later than 90 days after the
date of such taking.  Landlord shall be entitled to receive the entire award or
payment in connection therewith, except that Tenant shall have the right to
receive an award for its relocation expenses, damages to Tenant's personal
property, trade fixtures, and loss of goodwill.  All Rent shall be apportioned
as of the date of such termination, or the date of such taking, whichever shall
first occur.  If any part of the Premises shall be taken, and this Lease shall
not be so terminated, the Rent shall be proportionately abated or reduced based
on the number of rentable square feet of the Premises so taken.  Tenant hereby
waives any and all rights it might otherwise have pursuant to Section 1265.130
of The California Code of Civil Procedure, or any successor statute.

     13.2  Temporary Taking.  Notwithstanding anything to the contrary contained
           ----------------
in this Article 13, in the event of a temporary taking of all or any portion of
the Premises for a period of one hundred and twenty (120) days or less, then
this Lease shall not terminate but the Base Rent and the Additional Rent shall
be abated for the period of such taking (commencing on the date of such taking)
in proportion to the ratio that the amount of rentable square feet of the
Premises taken bears to the total rentable square feet of the Premises; provided
that if the remaining portion of the Premises is not sufficient to allow Tenant
to effectively conduct its business therein, and if Tenant does not conduct its
business from such remaining portion, then Base Rent and the Additional Rent
shall be abated
<PAGE>

for the entire Premises for such time as Tenant continues to be so prevented
from using, and does not use, the Premises. Landlord shall be entitled to
receive the entire award made in connection with any such temporary taking.

                                   ARTICLE 14
                           ASSIGNMENT AND SUBLETTING

     14.1  Transfers.  Subject to the provisions of this Article 14, Tenant
           ---------
shall not, without the prior written consent of Landlord, assign, mortgage,
pledge, hypothecate, encumber, or permit any lien to attach to, or otherwise
transfer, this Lease or any interest hereunder, permit any assignment or other
transfer of this Lease or any interest hereunder by operation of law, sublet the
Premises or any part thereof, or otherwise permit the occupancy or use of the
Premises by any persons other than Tenant, its Affiliates and their employees
(all of the foregoing are hereinafter sometimes referred to collectively as
"Transfers" and any person to whom any Transfer is made or sought to be made is
hereinafter sometimes referred to as a "Transferee").  Any Transfer with respect
to which Landlord's consent is required under this Article 14 and with respect
to which such consent requirement is not exempted under this Article 14 is
referred to herein as a "Consent Transfer."  If Tenant desires Landlord's
consent to any Consent Transfer, Tenant shall notify Landlord in writing, which
notice (the "Transfer Notice") shall include (i) the proposed effective date of
the Transfer, which shall not be less than (a) in the case of a sublease of less
than 24,000 rentable square feet, ten (10) business days, (b) in the case of a
sublease of 24,000 square feet or more, fifteen (15) business days, and (c) in
the case of an assignment of this Lease or any other Transfer, twenty (20)
business days after the date of delivery of the Transfer Notice, (ii) a
description of the portion of the Premises to be transferred (the "Subject
Space"), (iii) all of the principal terms of the proposed Transfer and the
consideration therefor, including a calculation of the "Transfer Premium," as
that term is defined in Section 14.3 below, in connection with such Transfer,
the name and address of the proposed Transferee, and a copy of all existing
and/or proposed documentation pertaining to the proposed Transfer, including all
then existing material, executed operative documents to evidence such Transfer
or the agreements incidental or related to such Transfer, (iv) current financial
statements of the proposed Transferee and (v) to the extent reasonably
available, any other reasonable information reasonably and customarily required
by landlords of Comparable Buildings in connection with the review of similar
Transfers.  Subject to the terms of this Article 14, any Consent Transfer made
without Landlord's prior written consent shall, at Landlord's option, be null,
void and of no effect.  Whether or not Landlord consents to any Consent
Transfer, Tenant shall pay Landlord's review and processing fees, as well as any
reasonable legal fees incurred by Landlord, within thirty (30) days after
written request by Landlord.

     14.2  Landlord's Consent.  Landlord shall not unreasonably withhold, delay
           ------------------
or condition its consent to any proposed Consent Transfer.  Subject to the
provisions of this Section 14.2, the parties hereby agree that it shall be
reasonable under this Lease and under any applicable law for Landlord to
withhold consent to any proposed Consent Transfer where one or more of the
following apply, without limitation as to other reasonable grounds for
withholding consent:

          14.2.1  The Transferee is of a character or reputation or engaged in a
business which is materially inconsistent with the quality of the Building; or

          14.2.2  The Transferee intends to use the Subject Space for purposes
which are inconsistent with those permitted under this Lease; or

          14.2.3  The Transferee is not a party of reasonable financial worth
and/or financial stability in light of the responsibilities to be undertaken in
connection with the Transfer on the date consent is requested; provided that the
provisions of this Section 14.2. shall be applicable only if (i) the proposed
Transfer is an assignment of Tenant's interest in the Lease, (ii) the proposed
Transfer concerns twenty thousand (20,000) rentable square feet or more of the
Premises, or (iii) upon the consummation of the proposal Transfer, the Original
Tenant and/or its Affiliates will not continue to directly occupy (i.e., have
not subleased or otherwise transferred its space) at least forty thousand
(40,000) rentable square feet of the Premises.

     If Landlord consents to any Consent Transfer pursuant to the terms of this
Section 14.2, Tenant may within six months after Landlord's consent, but not
later than the expiration of said six-month period, enter into such Transfer of
the Premises or portion thereof, provided that if there are any material changes
in the terms and conditions from those specified in the Transfer Notice such
that Landlord would initially have been entitled to refuse its consent to such
Transfer under this Section 14.2, Tenant shall again submit the Transfer to
Landlord for its consent under this Article 14.
<PAGE>

     14.3  Transfer Premium.
           ----------------

           14.3.1  Definition of Transfer Premium.  Subject to the terms of this
                   ------------------------------
Article 14, if Landlord consents to a Consent Transfer, as a condition thereto
which the parties hereby agree is reasonable, Tenant shall pay to Landlord one
half of any "Transfer Premium," as that term is defined in this Section 14.3,
received by Tenant from such Transferee.  "Transfer Premium" shall mean all
rent, additional rent or other consideration payable by such Transferee in
connection with the Transfer in excess of the Rent and Additional Rent payable
by Tenant under this Lease during the term of the Transfer on a per rentable
square foot basis if less than all of the Premises is transferred (unless all or
a portion of the Subject Space is subject to different Rent and Additional Rent
terms, in which case, to the extent applicable, such different terms shall be
applicable), after deducting the actual, out-of-pocket expenses incurred or to
be incurred by Tenant for the following (collectively, the "Subleasing Costs")
(i) any changes, alterations and improvements to the Premises in connection with
the Transfer, (ii) any space planning, architectural or design fees or expenses
incurred in marketing such space or in connection with such Transfer, (iii) any
improvement allowance or other monetary concessions provided to the Transferee,
(iv) any brokerage commissions incurred by Tenant in connection with the
Transfer, (v) legal fees incurred in connection with the Transfer, including
those fees and costs reimbursed to Landlord pursuant to the last sentence of
Section 14.1, (vi) any lease takeover costs incurred by Tenant in connection
with the Transfer, (vii) out-of-pocket costs of advertising the space which is
the subject of the Transfer, and (viii) the amount of any Base Rent and
Additional Rent paid by Tenant to Landlord with respect to the Subject Space
during the period, not to exceed four (4) months, commencing on the later of (a)
the earlier of the date Tenant contracts with a reputable broker to market the
Subject Space or commences negotiations with the Transferee as evidenced by an
exchange of proposals, or (b) the date Tenant vacates the Subject Space, until
the commencement of the term of the Transfer.  "Transfer Premium" shall also
include, but not be limited to, key money, bonus money or other cash
consideration paid by Transferee to Tenant in connection with such Transfer, but
shall exclude any payment which is not in excess of fair market value for (i)
services rendered by Tenant to Transferee or (ii) for assets, fixtures,
inventory, equipment, or furniture transferred by Tenant to Transferee in
connection with such Transfer.

           14.3.2 Payment of Transfer Premiums.  The determination of the amount
                  ----------------------------
of the Transfer Premium shall be made on a monthly basis in accordance with the
terms of this Section 14.3.2, as rent or other consideration is received by
Tenant by under the Transfer.  For purposes of calculating the Transfer Premium,
Tenant's Subleasing Costs shall be credited against the first amounts received
by Tenant as a result of the Transfer.

     14.4  Effect of Transfer.  Subject to the terms of this Article 14, if
           ------------------
Landlord consents to a Consent Transfer, (i) the terms and conditions of this
Lease shall in no way be deemed to have been waived or modified, (ii) such
consent shall not be deemed consent to any further Consent Transfer by either
Tenant or a Transferee, (iii) Tenant shall deliver to Landlord, promptly after
execution, an original executed copy of all documentation pertaining to the
Transfer, and (iv) Tenant shall furnish upon Landlord's request a reasonable
statement, certified by an independent certified public accountant, or Tenant's
chief financial officer or other appropriate officer of Tenant, setting forth in
reasonable detail the computation of any Transfer Premium Tenant has derived and
expects to derive from such Transfer. No Transfer relating to this Lease or
agreement entered into with respect thereto, whether with or without Landlord's
consent, shall relieve Tenant from liability under this Lease, including,
without limitation, in connection with the Subject Space, unless Tenant shall
provide evidence acceptable to Landlord, in its sole but reasonable discretion,
to the effect that the Transferee has a net worth in excess of $350,000,000.
Landlord or its authorized representatives shall have the right at all
reasonable times during normal business hours following ten (10) business days
advance notice to audit the books, records and papers of Tenant directly
relating to any Consent Transfer.  If the Transfer Premium respecting any
Consent Transfer shall be found understated, or overstated, the appropriate
party shall within thirty (30) days after demand, pay to the other the
deficiency or excess, and if understated by more than ten percent (10%), Tenant
shall pay Landlord's costs of such audit.

     14.5  Non-Transfers.  Notwithstanding anything to the contrary contained in
           -------------
this Article 14, an assignment of this Lease or subletting of all or a portion
of the Premises to an entity (an "Affiliate") which is controlled by, controls,
or is under common control with, Tenant or Tenant's parent or any subsidiary of
Tenant or Tenant's parent, or to a resulting entity from a merger or
consolidation of Tenant with another entity, shall not be deemed a Transfer
under this Article 14, and Landlord's consent shall not be required in
connection therewith, provided that Tenant notifies Landlord of any such
assignment or sublease and promptly supplies Landlord with any documents or
information reasonably requested by Landlord regarding such assignment or
sublease or such Affiliate or resulting entity, and further provided that such
assignment or sublease is not a subterfuge by Tenant to avoid its
<PAGE>

obligations under this Lease and shall in no way relieve Tenant from any
liability under this Lease. "Control," as used in this Section 14.5, shall mean
the possession, direct or indirect, of the power to direct or cause the
direction of the management and policies of a person or entity, whether through
the ownership of voting securities, by contract or otherwise. As used in this
Section 14.5, "Affiliate" shall also include any entity which is subleasing from
Tenant less than 12,000 square feet of rentable area of the Premises and on a
consolidated basis no more than 36,000 square feet and with respect to which no
demising wall is to be erected, and with the only identification of such
subtenant appearing on the door or doors to the offices, if any, in that portion
or portions of the Premises being occupied by such sublessee.

                                   ARTICLE 15
                        SURRENDER OF PREMISES; OWNERSHIP
                         AND REMOVAL OF TRADE FIXTURES

     15.1  Surrender of Premises.  No act or thing done by Landlord or any agent
           ---------------------
or employee of Landlord during the Lease Term shall be deemed to constitute an
acceptance by Landlord of a surrender of the Premises unless such intent is
specifically acknowledged in a writing signed by Landlord.  The delivery of keys
to the Premises to Landlord or any agent or employee of Landlord shall not
constitute a surrender of the Premises or effect a termination of this Lease,
whether or not the keys are thereafter retained by Landlord, and notwithstanding
such delivery Tenant shall be entitled to the return of such keys at any
reasonable time upon request until this Lease shall have been properly
terminated.  The voluntary or other surrender of this Lease by Tenant, whether
accepted by Landlord or not, or a mutual termination hereof, shall not work a
merger.

     15.2  Removal of Tenant Property by Tenant.  Upon the expiration of the
           ------------------------------------
Lease Term, or upon any earlier termination of this Lease, Tenant shall, subject
to the provisions of this Article 15 and Section 8.4 above, quit and surrender
possession of the Premises to Landlord in good order and condition, reasonable
wear and tear, casualty events, damage resulting from the negligence or
misconduct of the Landlord Parties, and repairs which are specifically made the
responsibility of Landlord hereunder excepted.  Upon such expiration or
termination, Tenant shall, without expense to Landlord, remove or cause to be
removed from the Premises all debris and rubbish, and such items of free-
standing furniture, equipment, cabinet work, and other personal property owned
by Tenant or installed or placed by Tenant at its expense in the Premises, and
such similar articles of any other persons claiming under Tenant, as Landlord
may, in its sole discretion, require to be removed, and, subject to the terms of
this Lease, Tenant shall repair at its own expense all damage to the Premises
and Building resulting from such removal.

                                   ARTICLE 16
                                  HOLDING OVER

     (a) If Tenant holds over after the expiration of the Lease Term hereof,
with or without the express or implied consent of Landlord, such tenancy shall
be from month-to-month only, and shall not constitute a renewal hereof or an
extension for any further term, and in such case Base Rent shall be payable at a
monthly rate equal to one hundred fifty percent (150%) of the Base Rent
applicable during the last rental period of the Lease Term under this Lease.
Such month-to-month tenancy shall be subject to every other term, covenant and
agreement contained herein.  Nothing contained in this Article 16 shall be
construed as consent by Landlord to any holding over by Tenant, and Landlord
expressly reserves the right to require Tenant to surrender possession of the
Premises to Landlord as provided in this Lease upon the expiration or other
termination of this Lease.  Except for the time limitation on Landlord's right
to seek consequential damages set forth in the next sentence (which time
limitation shall also apply to Landlord's rights to seek damages other than by
reason of the following sentence), the provisions of this Article 16 shall not
be deemed to limit or constitute a waiver of any other rights or remedies of
Landlord provided herein or at law.  If Tenant fails to surrender the Premises
within sixty (60) days after the termination or expiration of this Lease, then,
in addition to any other liabilities to Landlord accruing therefrom, Tenant
shall protect, defend, indemnify and hold Landlord harmless from all loss, costs
(including reasonable attorneys' fees) and liability resulting from such
failure, including, without limiting the generality of the foregoing, any claims
made by any succeeding tenant founded upon such failure to surrender, and any
lost profits to Landlord resulting therefrom.

     (b) Notwithstanding the foregoing, by written notice to Landlord given at
least 270 days prior to the expiration of the original Term, Tenant shall have
one time right to elect to holdover in the Premises (which holdover will be
deemed to be with Landlord's consent) for one (1), two (2), or three (3) full
months (as specified in Tenant's notice) at a Base Rent of $1.75 per "rentable
square feet" per month and Additional Rent, and such continued occupancy by
Tenant shall be subject to all of the other terms, covenants and conditions of
this Lease, so
<PAGE>

far as applicable. The Lease Term will be extended for the period specified in
such notice by Tenant to Landlord and a vacation of the Premises by Tenant prior
to such date will not relieve Tenant of liability for Monthly Base Rent and
Additional Rent accruing under this Lease through the expiration of the Term, as
extended pursuant to Tenant's notice. The provisions of this Subsection 16(b)
will survive the expiration or earlier termination of this Lease.

                                   ARTICLE 17
                             ESTOPPEL CERTIFICATES

     Within fifteen (15) business days following a request in writing by
Landlord, Tenant shall execute and deliver to Landlord an estoppel certificate,
which, as submitted by Landlord, shall be substantially in the form of Exhibit
                                                                       -------
F, attached hereto, indicating therein any exceptions thereto that may exist at
-
that time, and shall also contain any other customary factual information
certified to Tenant's knowledge, without a duty of investigation or inquiry by
Tenant, reasonably requested by Landlord or Landlord's mortgagee or prospective
mortgagee.  Tenant shall execute and deliver whatever other instruments may be
reasonably required for such purposes.  Landlord hereby agrees to provide to
Tenant an estoppel certificate signed by Landlord, containing the same types of
information, and within the same periods of time, as set forth above, with such
changes as are reasonably necessary to reflect that the estoppel certificate is
being granted to Tenant by Landlord, rather than being granted by Tenant  to
Landlord or to a lender.

                                   ARTICLE 18
                                 SUBORDINATION

     Subject to the terms of this Article 18, this Lease shall be subject and
subordinate to all future ground or underlying leases of the Real Property and
to the lien of any "Lender," which in this Lease shall mean any mortgagee under
a mortgage or beneficiaries under any trust deeds hereafter in force against the
Real Property and the Building, if any, and to all renewals, extensions,
modifications, consolidations and replacements thereof, and to all advances made
or hereafter to be made upon the security of such mortgages or trust deeds,
unless the Lenders or the lessors under such ground lease or underlying leases,
require in writing that this Lease be superior thereto. Landlord's delivery to
Tenant of commercially reasonable non-disturbance agreement(s) in favor of
Tenant from any ground lessors or Lenders, or ground lessors or Lenders who come
into existence at any time prior to the expiration of the Lease Term shall be in
consideration of, and a condition precedent to, Tenant's agreement to be bound
by the terms of this Article 18. Subject to the non-disturbance agreements
described above, Tenant covenants and agrees in the event any proceedings are
brought for the foreclosure (or deed lieu thereof) of any such mortgage, or if
any ground or underlying lease is terminated, to attorn, to the lien holder or
purchaser or any successors thereto upon any such foreclosure sale (or deed in
lieu thereof), or to the lessor of such ground or underlying lease, as the case
may be, if so requested to do so by such purchaser or lessor, and to recognize
such purchaser or lessor as the lessor under this Lease. Tenant shall, within 10
business days of request by Landlord, execute such further instruments or
assurances as Landlord may reasonably deem necessary, including a Subordination,
Nondisturbance and Attornment Agreement or other similar form reasonably
required by any lender making a loan secured by the Property to evidence or
confirm the subordination or superiority of this Lease to any such mortgages,
trust deeds, ground leases or underlying leases, subject to the terms of this
Article 18.

                                   ARTICLE 19
                               DEFAULTS; REMEDIES

     19.1  Events of Default.  The occurrence of any of the following shall
           -----------------
constitute an event of default ("Event of Default") under this Lease by Tenant:

           19.1.1  Any failure by Tenant to pay any Rent or any other charge
required to be paid under this Lease, or any part thereof, within ten (10)
business days after the due date thereof; or

           19.1.2  Any failure by Tenant to observe or perform any other
provision, covenant or condition of this Lease to be observed or performed by
Tenant where such failure continues for thirty (30) days after written notice
thereof from Landlord to Tenant; provided that if the nature of such default is
such that the same cannot reasonably be cured within a thirty (30)-day period,
Tenant shall not be deemed to be in default if it commences such cure within
such period and thereafter proceeds to rectify and cure said default with
reasonable diligence; or

           19.1.3  The failure by Tenant to observe or perform according to the
provisions of Article 17 or
<PAGE>

Article 18 of this Lease where such failure continues for more than ten (10)
business days after notice from Landlord.

     All notices to be given pursuant to this Section 19.1 shall be in addition
to and not in lieu of the notice requirements of the California Code of Civil
Procedure Section 1161 et seq.

     19.2  Remedies Upon Default.  Upon the occurrence of any Event of Default
           ---------------------
by Tenant, Landlord shall have, in addition to any other remedies available to
Landlord at law or in equity, the option to pursue any one or more of the
following remedies, each and all of which shall be cumulative and nonexclusive,
without any notice or demand whatsoever.

          19.2.1  Terminate this Lease, in which event Tenant shall immediately
surrender the Premises to Landlord, and if Tenant fails to do so, Landlord may,
subject to due process of law and without prejudice to any other remedy which it
may have for possession or arrearages in rent, enter upon and take possession of
the Premises and expel or remove Tenant and any other person who may be
occupying the Premises or any part thereof; and Landlord may recover from Tenant
the following:

               (i)   The worth at the time of award of any unpaid rent which has
     been earned at the time of such termination; plus

               (ii)  The worth at the time of award of the amount by which the
     unpaid rent which would have been earned after termination until the time
     of award exceeds the amount of such rental loss that Tenant proves could
     have been reasonably avoided; plus

               (iii) The worth at the time of award of the amount by which the
     unpaid rent for the balance of the Lease Term after the time of award
     exceeds the amount of such rental loss that Tenant proves could have been
     reasonably avoided; plus

               (iv)  Any other amount reasonably 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 of
     things would be likely to result therefrom, specifically including but not
     limited to, brokerage commissions and advertising expenses incurred,
     expenses of remodeling the Premises or any portion thereof for a new
     tenant, whether for the same or a different use, and any special
     concessions made to obtain a new tenant; and

               (v)   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.

     The term "rent" as used in this Section 19.2 shall be deemed to be and to
mean all sums of every nature required to be paid by Tenant to Landlord pursuant
to the terms of this Lease.  As used in Paragraphs 19.2.1(i) and (ii), above,
the "worth at the time of award" shall be computed by allowing interest at the
rate set forth in Article 25 of this Lease, but in no case greater than the
maximum amount of such interest permitted by law.  As used in Paragraph
19.2.1(iii) above, the "worth at the time of award" shall be computed by
discounting such amount at the discount rate of the Federal Reserve Bank of San
Francisco at the time of award plus one percent (1%).

          19.2.2  Landlord shall have the remedy described in California Civil
Code Section 1951.4 (lessor may continue lease in effect after lessee's breach
and abandonment and recover rent as it becomes due, if lessee has the right to
sublet or assign, subject only to reasonable limitations).  Accordingly, if
Landlord does not elect to terminate this Lease on account of any default by
Tenant, Landlord may, from time to time, without terminating this Lease, enforce
all of its rights and remedies under this Lease, including the right to recover
all rent as it becomes due.

     19.3  Sublessees of Tenant.  In the event Landlord elects to terminate this
           --------------------
Lease on account of any Event of Default by Tenant, Landlord shall have the
right to terminate any and all subleases, licenses, concessions or other
consensual arrangements for possession entered into by Tenant and affecting the
Premises or may, in Landlord's sole discretion, succeed to Tenant's interest in
such subleases, licenses, concessions or arrangements.  In the event of
Landlord's election to succeed to Tenant's interest in any such subleases,
licenses, concessions or arrangements, Tenant shall, as of the date of notice by
Landlord of such election, have no further right to or interest in the rent or
other consideration receivable thereunder.
<PAGE>

     19.4  Waiver of Default.  No waiver by Landlord or Tenant of any violation
           -----------------
or breach of any of the terms, provisions and covenants herein contained shall
be deemed or construed to constitute a waiver of any other or later violation or
breach of the same or any other of the terms, provisions, and covenants herein
contained.  Forbearance by Landlord or Tenant in enforcement of one or more of
the remedies herein provided upon an Event of Default shall not be deemed or
construed to constitute a waiver of such default.  The acceptance of any Rent or
other payment hereunder by Landlord or Tenant following the occurrence of any
default, whether or not known to Landlord or Tenant, as the case may be, shall
not be deemed a waiver of any such default, except only a default in the payment
of the Rent or other payment so accepted.

     19.5  Efforts to Relet.  For the purposes of this Article 19, neither this
           ----------------
Lease nor Tenant's right to possession shall be deemed to have been terminated
by efforts of Landlord to relet the Premises, by its acts of maintenance or
preservation with respect to the Premises, or by appointment of a receiver to
protect Landlord's interests hereunder.  The foregoing enumeration is not
exhaustive, but merely illustrative of acts which may be performed by Landlord
without terminating this Lease or Tenant's right to possession.

     19.6  Landlord Default.  Notwithstanding anything to the contrary set forth
           ----------------
in this Lease, Landlord shall be in default in the performance of any obligation
required to be performed by Landlord pursuant to this Lease if (i) Landlord is
obligated to make a payment of money to Tenant, and Landlord fails to pay such
unpaid amounts within ten (10) days of written notice from Tenant that the same
was not paid when due, or (ii) such failure is other than the obligation to pay
money, and Landlord fails to perform such obligation within thirty (30) days
after the receipt of notice from Tenant specifying in detail Landlord's failure
to perform; provided, however, if the nature of Landlord's obligation is such
that more than thirty (30) days are required for its performance, then Landlord
shall not be in default under this Lease if it shall commence such performance
within such thirty (30) day period and thereafter diligently pursue the same to
completion.  Upon any such default by Landlord under this Lease, Tenant may,
except as otherwise specifically provided in this Lease to the contrary,
exercise any of its rights provided at law or in equity; provided that, except
as otherwise specifically provided in this Lease to the contrary, Tenant shall
have no right to terminate this Lease. Tenant shall have the right to terminate
this Lease if after giving the notice required above, Landlord fails timely to
pay the Tenant Improvement Allowance or cure a breach of the covenant of quiet
enjoyment.

                                   ARTICLE 20
                          COVENANT OF QUIET ENJOYMENT

     Subject to Landlord's rights following an Event of Default, Landlord
covenants that during the Lease Term Tenant shall peaceably and quietly have,
hold and enjoy the Premises subject to the terms, covenants, conditions,
provisions and agreements hereof without interference by any persons lawfully
claiming by or through Landlord.  The foregoing covenant is in lieu of any other
covenant express or implied, except as otherwise expressly provided in this
Lease.

                                   ARTICLE 21
                                 FORCE MAJEURE

     Any prevention, delay or stoppage due to strikes, lockouts, labor disputes,
acts of God, inability to obtain services, labor, or materials or reasonable
substitutes therefor after reasonable efforts to do so, governmental actions,
civil commotions, fire or other casualty, and other causes beyond the reasonable
control of the party obligated to perform, except with respect to the
obligations imposed with regard to Rent and other monetary charges to be paid
pursuant to this Lease, and except with regard to the time periods set forth in
Article 11 of this Lease, but preserving the use of this Article in the context
of Article 11 to the extent that the delays described above are on a "industry-
wide" basis and cannot be specifically resolved with respect to the Premises
independent of the industry-wide circumstances (collectively, the "Force
Majeure"), notwithstanding anything to the contrary contained in this Lease,
shall excuse the performance of such party for a period equal to any such
prevention, delay or stoppage and, therefore, if this Lease specifies a time
period for performance of an obligation of either party, that time period shall
be extended by the period of any delay in such party's performance caused by a
Force Majeure.
<PAGE>

                                   ARTICLE 22
                                ATTORNEYS' FEES

     If either party commences an action against the other for the specific
performance of this Lease, for damages for the breach hereof or otherwise for
enforcement of any remedy hereunder, the parties hereto agree that the
prevailing party shall be entitled to recover from the other party such costs
and reasonable attorneys' fees as may have been incurred, including any and all
costs incurred in enforcing, perfecting and executing such judgment.

                                   ARTICLE 23
                                     SIGNS

     23.1 Monument Signage.
          ----------------

          23.1.1  Design and Approval.  Subject to the provisions of this
                  -------------------
Section 23.1, and any applicable governmental requirements, Tenant shall have
the exclusive right to have a "Tenant Name" as that term is defined below,
placed upon a monument sign (the "Monument Sign") located in front of the
Building.

          23.1.2  Tenant Name.  Tenant shall have the right at Tenant's expense,
                  -----------
to designate from time to time during the Lease Term, including any Option Term,
as the "Tenant Name", either (i) the name and/or logo of Tenant, or (ii) the
name and/or logo of a Transferee of Tenant properly approved by Landlord
pursuant to the terms of Article 14, and which Transferee occupies at least
fifty percent (50%) of the Premises, provided that such Tenant Name shall not be
an "Objectionable Name" as that term is defined in this Section 23.1.2, below.
The term "Objectionable Name" shall mean any name which relates to an entity
which is of a character or reputation, or is associated with a political
orientation or faction, which is inconsistent with the quality of the Real
Property, or which would otherwise reasonably offend a landlord of a Comparable
Building.

          23.1.3  Repair and Maintenance; Government Approval.  Tenant shall be
                  -------------------------------------------
responsible for the cost of the design, permitting, construction and
installation of the Monument Sign and Tenant Name (the "Sign Cost"), and shall
also be responsible for the repair and maintenance during the Lease Term of the
Monument Sign.  Tenant shall also be responsible for the cost and expense of the
removal of its name from and restoration of the Building, if affected by the
Monument Sign (or from the sign itself, but without restoration obligations) as
of the expiration or earlier termination of the Lease.  Tenant acknowledges and
agrees that the Monument Sign shall be subject to all necessary approvals and
permits from governmental agencies and shall comply with the CC&Rs.

     23.2  Building Signage.  Tenant shall have the exclusive right, during the
           ----------------
Lease Term, at Tenant's sole cost and expense, to install a sign, with the
specifications as set forth on Exhibit G, attached hereto, on the exterior of
                               -------
the Building containing the Tenant Name (the "Building Signage"), provided that
such Building Signage shall be subject to all of the terms of the CC&Rs and any
applicable governmental requirements.  Except as provided in this Lease, Tenant
shall be responsible, at Tenant's sole cost and expense, to repair and maintain
the Building Signage in first class condition during the Lease Term.  In
addition Tenant shall be responsible for the cost and expense of the removal of
the Building Signage as of the termination or earlier expiration of the Lease
Term, and for the cost of repair of any damage to the Building resulting from
such removal.

     23.3  Prohibited Signage and Other Items.  Except as approved elsewhere in
           ----------------------------------
this Lease, any signs, notices, logos, pictures, names or advertisements which
are installed and visible from the exterior of the Premises and/or Building and
that have not been individually approved by Landlord may be removed without
notice by Landlord at the sole expense of Tenant.  Any signs, window coverings,
or blinds (even if the same are located behind the Landlord approved window
coverings for the Building), or other items visible from the exterior of the
Premises or Building are subject to the prior approval of Landlord, in its sole
but reasonable discretion. Landlord shall have the right to refer to the Tenant
Name in connection with its ownership and operation of the Building, including
its sales and promotional materials and regulatory filings.

                                   ARTICLE 24
                              COMPLIANCE WITH LAW

     Neither Landlord nor Tenant shall do anything in or about the Premises
which will in any way conflict with any law, statute, ordinance or other
governmental rule, regulation or requirement now in force or which may hereafter
be enacted or promulgated (collectively, "Laws"). To the best of Landlord's
knowledge, the Premises comply with all Laws as of the date hereof.  Should any
Laws now or hereafter be imposed on Landlord or Tenant
<PAGE>

by a state, federal or local governmental body charged with the establishment,
regulation and enforcement of occupational, health or safety standards for
employers, employees or tenants, then (i) Tenant agrees, at its sole cost and
expense, to comply promptly with such Laws if they relate to any of the Tenant
Maintenance Items, the Tenant Improvements or the Alterations or Tenant's use
and occupancy of the Premises and to make all alterations to the Premises,
Building, and/or Real Property as are required to comply with such Laws and (ii)
Landlord shall comply with and all other Laws, including those which relate to
the Landlord Maintenance Items, unless such compliance obligations are triggered
by the construction of the Tenant Improvements or Alterations, in which event
such compliance obligations to the Landlord Maintenance Items shall be at
Tenant's sole cost and expense.

                                   ARTICLE 25
                                  LATE CHARGES

     Any Rent or other amounts payable to Landlord under this Lease, if not paid
by the fifth day after the due date, shall incur a late charge of five percent
(5%) for Landlord's administrative expense in processing such delinquent payment
and in addition thereto shall bear interest at the rate of fifteen percent (15%)
per annum from and after the due date for such payment.  In no event shall the
rate of interest payable on any late payment exceed the legal limits for such
interest enforceable under applicable law.  The interest shall accrue from the
date such payment was due until the date such payment is received.  Such late
charge and interest shall be payable immediately to Landlord as Additional Rent
hereunder.  Acceptance of such late charge by Landlord shall in no event
constitute a waiver of Tenant's default with respect to such overdue amount, or
prevent Landlord from exercising any of the other rights and remedies granted
hereunder.  Nothing contained in this paragraph, however, shall be construed to
require Landlord to accept a late payment from Tenant.  If Landlord does accept
a late payment from Tenant, then Tenant shall remain in default under this lease
until Tenant pays all late charge(s) and interest provided for in this
paragraph.  There will also be a charge should any check be returned by a bank
for insufficient funds.

                                   ARTICLE 26
              LANDLORD'S RIGHT TO CURE DEFAULT; PAYMENTS BY TENANT

     26.1  Landlord's Cure.  Except as otherwise specifically set forth in this
           ---------------
Lease, all covenants and agreements to be kept or performed by Tenant under this
Lease shall be performed by Tenant at Tenant's sole cost and expense and without
any reduction of Rent.  If Tenant shall fail to perform any of its obligations
under this Lease within a reasonable time after such performance is required by
the terms of this Lease, Landlord may, but shall not be obligated to, after
thirty (30) days prior notice to Tenant (or in the case of an emergency, after
such notice as is reasonable under the circumstances), make any such payment or
perform any such act on Tenant's part without waiving its right based upon any
default of Tenant and without releasing Tenant from any obligations hereunder.

     26.2  Tenant's Reimbursement.  Except as may be specifically provided to
           ----------------------
the contrary in this Lease, Tenant shall pay to Landlord, within fifteen (15)
days after delivery by Landlord to Tenant of statements therefor, sums equal to
expenditures reasonably made and obligations reasonably incurred by Landlord in
connection with the remedying by Landlord of Tenant's defaults pursuant to the
provisions of Section 26.1.  Tenant's obligations under this Section 26.2 shall
survive the expiration or sooner termination of the Lease Term.

                                   ARTICLE 27
                               ENTRY BY LANDLORD

     Subject to the provisions of this Lease, and provided Landlord uses
commercially reasonable efforts to minimize any interference with Tenant's
business, Landlord reserves the right during the hours 9:00 A.M. to 5:00 P.M.,
Monday through Friday (other than a holiday) or at other times when Tenant is
open for business and upon reasonable notice to the Tenant (or in the case of an
emergency upon such notice as is reasonable under the circumstances, including
such attempts as may be reasonable under the circumstances to reach Tenant by
telephone) to enter the Premises to (i) inspect them; (ii) show the Premises to
prospective purchasers, mortgagees or tenants, ground or underlying lessors or
insurers (provided that such right shall not extend to prospective tenants until
twelve (12) months prior to the Lease Expiration Date); (iii) post notices of
nonresponsibility; or (iv) alter, improve or repair the Premises or the Building
if necessary to comply with Laws, or for alterations, repairs or improvements to
the Landlord Maintenance Items.  Notwithstanding anything to the contrary
contained in this Article 27, and subject to the notice requirements set forth
in Section 19.1.2, above, and Landlord's compliance with the terms of
<PAGE>

Section 26.1, Landlord may enter the Premises at any time to perform any
covenants of Tenant which Tenant fails to perform. Except as otherwise expressly
provided in this Lease, any such entries shall be without the abatement of Rent
and shall include the right to take such reasonable steps as required to
accomplish the stated purposes. Tenant hereby waives any claims (not including
claims for physical property damages (subject to Section 10.4 hereof) or
personal injury damages) for any injuries or inconvenience to or interference
with Tenant's business or lost profits, occasioned thereby. For each of the
above purposes, Landlord shall at all times have a key with which to unlock all
the doors in the Premises, excluding Tenant's vaults, safes and special security
areas designated in advance by Tenant. In an emergency, Landlord shall have the
right to use any means that Landlord may in good faith deem proper to open the
doors in and to the Premises. Subject to the provisions of this Lease, any entry
into the Premises by Landlord in the manner hereinbefore described shall not be
deemed to be a forcible or unlawful entry into, or a detainer of, the Premises,
or an actual or constructive eviction of Tenant from any portion of the
Premises. Notwithstanding the foregoing, as reasonably necessary in connection
with Tenant's business use of the Premises, Tenant may designate certain secure
areas, and on prior written notice to Landlord of these areas, Tenant may deny
Landlord access to such areas except in an emergency or when Landlord is
accompanied by Tenant. Subject to the provisions of this Lease, no provision of
this Lease shall be construed as obligating Landlord to perform any repairs,
alterations or decorations except as otherwise expressly agreed to be performed
by Landlord herein.

                                   ARTICLE 28
                             INTENTIONALLY OMITTED

                                   ARTICLE 29
                            MISCELLANEOUS PROVISIONS

     29.1  Terms.  The necessary grammatical changes required to make the
           -----
provisions hereof apply either to corporations or partnerships or individuals,
men or women, as the case may require, shall in all cases be assumed as though
in each case fully expressed.

     29.2  Binding Effect.  Each of the provisions of this Lease shall extend to
           --------------
and shall, as the case may require, bind or inure to the benefit not only of
Landlord and of Tenant, but also of their respective successors or assigns,
provided this clause shall not permit any assignment by Tenant contrary to the
provisions of Article 14 of this Lease.

     29.3  No Air Rights.  No rights to any view or to light or air over any
           -------------
property, whether belonging to Landlord or any other person, are granted to
Tenant by this Lease.

     29.4  Modification of Lease.  Should any prospective mortgagee or ground
           ---------------------
lessor for the Building or Real Property require a modification or modifications
of this Lease, which modification or modifications will not directly or
indirectly cause an increased cost or expense to Tenant under this Lease or in
connection with Tenant's business operations, or have any negative economic
impact, or any other material negative impact, on the Premises or Tenant's
occupancy of the Premises or in any other way adversely change the rights and
obligations of Tenant hereunder including, without limitation, all rights and
obligations of Tenant with respect to renewal, assignment and subletting,
insurance proceeds and Tenant's rights to terminate this Lease, or receive
abatement of Rent, then and in such event, Tenant agrees that this Lease may be
so modified at Landlord's sole cost and expense (including Tenant's reasonable
attorneys' fees for review of the same), and agrees to execute whatever
reasonable documents are required therefor and deliver the same to Landlord
within thirty (30) days following the request therefor.  Should Landlord or any
such prospective mortgagee or ground lessor require execution of a short form of
Lease for recording, containing, among other customary provisions, the names of
the parties, a description of the Premises and the Lease Term, Tenant agrees to
execute such short form of Lease and to deliver the same to Landlord within
fifteen (15) business days following Tenant's receipt of written request
therefor.

     29.5  Transfer of Landlord's Interest.  Tenant acknowledges that Landlord
           -------------------------------
has the right to transfer all or any portion of its interest in the Real
Property and Building and in this Lease.  Tenant agrees that in the event of a
transfer of fee title and provided that such transferee is a bona fide purchaser
and agrees in writing to perform all of Landlord's obligations thereafter
accruing, Landlord shall automatically be released from all liability under this
Lease thereafter accruing and Tenant agrees to look solely to such transferee
for the performance of Landlord's obligations hereunder arising or accruing
after the date of transfer upon agreement by such transferee to fully assume and
be liable for all obligations of this Lease to be performed by Landlord which
first accrue or arise after the date of the conveyance, and Tenant shall attorn
to such transferee.  Tenant further acknowledges that Landlord
<PAGE>

may assign its interest in this Lease to a mortgage lender as additional
security and agrees that such an assignment shall not release Landlord from its
obligations hereunder and that unless and until such mortgage lender succeeds to
Landlord's interest and obligations hereunder, Tenant shall continue to look to
Landlord for the performance of its obligations hereunder.

     29.6  Prohibition Against Recording.  A memorandum of this Lease may be
           -----------------------------
recorded by Tenant provided Landlord may first require Tenant's agreement to
deliver to Landlord an executed, recordable, memorandum of termination of the
same, within ten (10) business days after the expiration or earlier termination
of this Lease and provided Tenant will pay all costs of such recordation.

     29.7  Landlord's Title.  Subject to and except for the rights of Tenant
           ----------------
expressly set forth in this Lease, Landlord's title is and always shall be
paramount to the title of Tenant, and nothing herein contained shall empower
Tenant to do any act which can, shall or may encumber the title of Landlord.

     29.8  Captions.  The captions of Articles and Sections are for convenience
           --------
only and shall not be deemed to limit, construe, affect or alter the meaning of
such Articles and Sections.

     29.9  Relationship of Parties.  Nothing contained in this Lease shall be
           -----------------------
deemed or construed by the parties hereto or by any third party to create the
relationship of principal and agent, partnership, joint venturer or any
association between Landlord and Tenant.

     29.10  Time of Essence.  Time is of the essence of this Lease and each of
            ---------------
its provisions.

     29.11  Partial Invalidity.  If any term, provision or condition contained
            ------------------
in this Lease shall, to any extent, be invalid or unenforceable, the remainder
of this Lease, or the application of such term, provision or condition to
persons or circumstances other than those with respect to which it is invalid or
unenforceable, shall not be affected thereby, and each and every other term,
provision and condition of this Lease shall be valid and enforceable to the
fullest extent possible permitted by law.

     29.12  No Warranty.  Except as otherwise expressly set forth in this Lease,
            -----------
in executing and delivering this Lease, Tenant has not relied on any
representation, including, but not limited to, any representation whatsoever as
to the amount of any item comprising Additional Rent or the amount of the
Additional Rent in the aggregate or that Landlord is furnishing the same
services to other tenants, at all, on the same level or on the same basis, or
any warranty or any statement of Landlord which is not set forth herein or in
one or more of the exhibits attached hereto.

     29.13  Landlord Exculpation.  It is expressly understood and agreed that,
            --------------------
notwithstanding anything in this Lease to the contrary, the liability of
Landlord or the Landlord Parties to Tenant for performance of Landlord's
obligation under the Lease shall be (i) limited solely and exclusively to an
amount which is equal to the interest of Landlord in the Building and Real
Property and to the proceeds of any insurance (the cost of which is included in
Operating Expenses) or condemnation awards received by Landlord pursuant to the
items of Article 13 of this Lease and (ii) subject to the waiver of
consequential damages set forth in Section 10.1, above.  Neither Landlord, nor
any of the Landlord Parties shall have any personal liability therefor, and
Tenant hereby expressly waives and releases such personal liability on behalf of
itself and all persons claiming by, through or under Tenant; provided, however,
if Landlord incurs any liability to Tenant under this Lease which liability is
reduced to a judgment against Landlord, then Tenant shall be entitled to deduct
the amount of such judgment from Rent payable by Tenant under this Lease.  The
limitations of liability contained in this Section 29.13 shall inure to the
benefit of Landlord's and the Landlord Parties' present and future partners,
beneficiaries, officers, directors, trustees, shareholders, agents and
employees, and their respective partners, heirs, successors and assigns.

     29.14  Entire Agreement.  It is understood and acknowledged that there are
            ----------------
no oral agreements between the parties hereto affecting this Lease and this
Lease supersedes and cancels any and all previous negotiations, arrangements,
brochures, agreements and understandings, if any, between the parties hereto or
displayed by Landlord to Tenant with respect to the subject matter thereof, and
none thereof shall be used to interpret or construe this Lease.  This Lease
(including all exhibits attached hereto), and any side letter or separate
agreement executed by Landlord and Tenant in connection with this Lease and
dated of even date herewith contain all of the terms, covenants, conditions,
warranties and agreements of the parties relating in any manner to the rental,
use and occupancy of the Premises, shall be considered to be the only agreement
between the parties hereto and their representatives and agents, and none of the
terms, covenants, conditions or provisions of this Lease can be modified,
<PAGE>

deleted or added to except in writing signed by the parties hereto.  All
negotiations and oral agreements acceptable to both parties have been merged
into and are included herein.  There are no other representations or warranties
between the parties, and all reliance with respect to representations is based
totally upon the representations and agreements contained in this Lease.

     29.15  Intentionally Omitted.
            ---------------------

     29.16  Notices.  All notices, demands, statements, designations, approvals
            -------
or other communications (collectively, "Notices") given or required to be given
by either party to the other hereunder or by law shall be in writing, and shall
be delivered personally or by nationally recognized overnight courier service
or sent by United States certified or registered mail, postage prepaid, return
receipt requested (i) to Tenant at the appropriate addresses set forth in
Section 5 of the Summary, or to such other place in the continental United
States as Tenant may from time to time designate in a Notice to Landlord; or
(ii) to Landlord at the addresses set forth in Section 3 of the Summary, or to
such other firm or to such other place in the continental United States as
Landlord may from time to time designate in a Notice to Tenant.  Any Notice will
be deemed given on the date it is received as provided in this Section 29.16 or
upon the date personal delivery is made.  If Tenant is notified of the identity
and address of Landlord's mortgagee or ground or underlying lessor, Tenant shall
give to such mortgagee or ground or underlying lessor at the address set forth
in such notice a written notice of any default by Landlord under the terms of
this Lease and allow such mortgagee or ground or underlying lessor 30 days
within which to cure such default.

     29.17  Authority.  If either party is a corporation or partnership, each
            ---------
individual executing this Lease on behalf of such party hereby represents and
warrants that such party is a duly formed and existing entity and that such
party has full right and authority to execute and deliver this Lease and that
each person signing on behalf of such party is authorized to do so.

     29.18  Governing Law.  This Lease shall be construed and enforced in
            -------------
accordance with the laws of the State of California.

     29.19  Submission of Lease.  Submission of this instrument for examination
            -------------------
or signature by Tenant does not constitute a reservation of or an option for
lease, and it is not effective as a lease or otherwise until execution and
delivery by both Landlord and Tenant.

     29.20  Brokers.  Landlord and Tenant hereby warrant to each other that they
            -------
have had no dealings with any real estate broker or agent in connection with the
negotiation of this Lease, excepting only the real estate brokers specified in
Section 9 of the Summary (the "Brokers"), to whom Landlord shall be obligated to
pay a commission pursuant to separate brokerage agreements (the "Brokerage
Agreements"), and that they know of no other real estate broker or agent who is
entitled to a commission in connection with this Lease.  Each party agrees to
indemnify and defend the other party against and hold the other party harmless
from any and all claims, demands, losses, liabilities, lawsuits, judgments, and
costs and expenses (including without limitation reasonable attorneys' fees)
with respect to any leasing commission or equivalent compensation alleged to be
owing on account of the indemnifying party's dealings with any real estate
broker or agent other than the Broker.

     If at the time of renewal or extension of the term of this Lease, the
Brokerage Agreements between Landlord and Brokers provide that Landlord is not
obligated to pay a commission to Broker if Tenant presents to Landlord and/or
Broker a written exclusive listing agreement with another broker, then in the
event that (i) Landlord or its successor in interest is otherwise obligated to
pay a commission to Brokers pursuant to the terms of the Brokerage Agreement as
the result of any renewal or extension of the term of this Lease, and (ii)
Tenant uses a broker other than Brokers in connection with such renewal or
extension of the term of this Lease and such use is not pursuant to such written
exclusive listing agreement with another broker, then Tenant shall be obligated
to pay any fee, commission or other compensation to such broker and Tenant's
indemnity obligation to Landlord, as set forth in this Section 29.20, shall
apply with regard to such broker.

     29.21  Independent Covenants.  If Landlord fails to perform its obligations
            ---------------------
set forth herein, Tenant shall not, except as expressly provided in this Lease
to the contrary, be entitled (i) to make any repairs or perform any acts
hereunder at Landlord's expense or (ii) to any setoff of the Rent or other
amounts owing hereunder against Landlord; provided, however, that the foregoing
shall in no way impair the right of Tenant to commence a separate action against
Landlord for any violation by Landlord of the provisions hereof so long as, to
the extent required in this Lease, notice is first given to Landlord and an
opportunity is granted to Landlord to correct such violations as
<PAGE>

provided in Section 19.5 above.

     29.22  Intentionally Omitted.
            ---------------------

     29.23  Transportation Management.  To the extent required by Laws, Tenant
            -------------------------
shall fully comply with all present or future programs intended to manage
parking, transportation or traffic in and around the Building.

     29.24  Hazardous Material.
            ------------------

            29.24.1  Definition.  As used herein, the term "Hazardous Material"
                     ----------
means any hazardous or toxic substance, material or waste which is or becomes
regulated by any local governmental authority, the State of California or the
United States Government. The term "Hazardous Material" includes, without
limitation, any material or substance which is (i) defined as a "hazardous
waste," "extremely hazardous waste" or "restricted hazardous waste" under
Sections 25115, 25117 or 25122.7, or listed pursuant to Section 25140 of the
California Health and Safety Code, Division 20, Chapter 6.5 (Hazardous Waste
Control Law), (ii) defined as a "hazardous substance" under Section 25316 of the
California Health and Safety Code, Division 20, Chapter 6.95 (Hazardous
Materials Release Response Plans and Inventory), (iii) defined as a "hazardous
substance" under Section 25281 of the California Health and Safety Code,
Division 20, Chapter 6.7 (Underground Storage of Hazardous Substances), (iv)
petroleum, (v) asbestos or asbestos containing materials, (vi) listed under
Article 9 or defined as hazardous or extremely hazardous pursuant to Article 11
of Title 22 of the California Administrative Code, division 4, Chapter 20, (vii)
designated as a "hazardous substance" pursuant to Section 311 of the Federal
Water Pollution Control Act (33 U.S.C. Section 1317), (viii) defined as a
"hazardous waste" pursuant to Section 1004 of the Federal Resource Conservation
and Recovery Act, 42 U.S.C. Section 6902 et seq. (42 U.S.C. 6903), or (ix)
defined as a "hazardous substance" pursuant to Section 101 of the Compensation
and Liability Act, 42 U.S.C. Section 9601 et seq. (42 U.S.C. 9601).

            29.24.2  Operating Expenses.  Tenant acknowledges that Landlord may
                     ------------------
incur costs for complying with laws, codes, regulations or ordinances relating
to Hazardous Material, including, without limitation, the following: (i)
Hazardous Material present in soil or ground water; (ii) Hazardous Material that
migrates, flows, percolates, diffuses or in any way moves onto or under the Real
Property, (iii) Hazardous Material present on or under the Real Property as a
result of any discharge, dumping or spilling (whether accidental or otherwise)
on the Real Property by persons or entities other than Landlord and Tenant; and
(iv) material which becomes Hazardous Material due to a change in laws, codes,
regulations or ordinances which relate to hazardous or toxic material,
substances or waste. Tenant agrees that the costs incurred by Landlord with
respect to, or in connection with, the Project for complying with laws, codes,
regulations or ordinances relating to Hazardous Material shall be paid by Tenant
if such costs are a result of a violation by Tenant of its covenant and
agreement in Section 5.2 of this Lease, and shall be an Operating Expense only
if such costs qualify (x) under this Section 29.24 to the extent that such
compliance does not relate to Hazardous Materials which exist on or under the
Project prior to the commencement of the Lease Term, and (y) under clause (iv)
so long as such cost and compliance with said clause (iv) is amortized over a
seven-year period with Tenant only being responsible for such costs to the
extent that the term of this Lease is included within such seven-year
amortization period, unless the cost of such compliance, as between Landlord and
Tenant, is made the responsibility of Tenant under this Lease. To the extent
such Operating Expense relating to Hazardous Material is subsequently recovered
or reimbursed through insurance, or recovery from responsible third parties, or
other action, Tenant shall be entitled to a proportionate recovery of such
Operating Expense to which such recovery or reimbursement relates.

            29.24.3  Landlord's Representation. Tenant acknowledges receipt of
                     -------------------------
that certain Report of Phase I Environmental Site Assessment prepared by
Law/Crandall, Inc., dated April 16, 1996. Landlord hereby represents to Tenant
that to the best of Landlord's knowledge and except as otherwise disclosed in
said report, on execution of this Lease, there will be no Hazardous Materials
located in, on or under the Building, the Real Property or the Premises, and
there has been no violation thereon of any law governing Hazardous Materials.

            29.24.4  Third Parties.  Tenant and Landlord agree to share equally
                     -------------
any costs directly attributable to Hazardous Substances in, on, under, at or
about the Premises which arise following the Lease Commencement Date and are
caused by a party other than Landlord and Tenant and their respective agents,
contractors, licensees, invitees or employees (it being agreed that each of
Landlord and Tenant shall be solely responsible for costs directly attributable
to Hazardous substances in, on, under, at or about the Premises caused by its
agents, contractors, licensees, invitees or employees.
<PAGE>

     29.25  Rules and Regulations.  Tenant shall comply with the Rules and
            ---------------------
Regulations set forth in Exhibit D, together with any reasonable changes thereto
                         -------
which may be made by Landlord from time to time.

     29.26  Reasonable Consent.  Except for matters for which there is a
            ------------------
standard of consent or approval specifically set forth in this Lease, in which
case the express standard shall control, and except for matters which could (i)
adversely affect the Systems and Equipment, (ii) adversely affect the Building
structure, or (iii) affect the exterior appearance of the Building, in which
case Landlord shall have the right to act in its sole and absolute discretion
(but at all times in good faith) as to the matters described in items (i), and
(ii) and (iii) above, any time the consent or approval of Landlord or Tenant is
required under this Lease, such consent or approval shall not be unreasonably
withheld, conditioned or delayed.  Subject to the foregoing, and except for
matters pertaining to the exercise by either party of any remedies in the event
of a default by the other party, in the event this Lease grants Landlord or
Tenant the right to take action, exercise discretion, establish rules and
regulations or make an allocation or other determination, Landlord and Tenant
shall act reasonably and in good faith.

     29.27  Counterparts.  This Lease may be executed in counterparts, each of
            ------------
which shall be deemed an original, but such counterparts, when taken together
shall constitute one agreement.

     29.28  Building Security.  Tenant, at its sole expense, shall be permitted
            -----------------
to install its own security system (which may be a card-key security system) in
the Building and any portion thereof.

     29.29  Telecommunications Equipment and Other Appurtenances.
            ----------------------------------------------------

            29.29.1  Installation.  At any time during the Lease Term, Tenant
                     ------------
shall have the exclusive right, so long as Tenant is the sole lessee of all non-
common areas of the Building and thereafter a non-exclusive right, to install at
Tenant's sole cost and expense, satellites, microwave dishes and any other type
of telecommunications or communications device ("Communications Equipment") upon
the roof of the Building at a location designated by Tenant, which location as
well as Tenant's plans and specifications relating to the installation of
Tenant's Communications Equipment shall be subject to Landlord's reasonable
approval, without the payment of operating expenses; provided, however, Tenant
shall pay all cost of such Communications Equipment, including, without
limitation, the utilities and maintenance necessary to Tenant's operation of the
Communications Equipment and liability insurance for such Communications
Equipment, and Landlord may require Tenant to install screening around such
Communications Equipment, at Tenant's sole cost and expense, as reasonably
designated by Landlord or as required by applicable law. The Communications
Equipment shall comply with all governmental laws and ordinances and with the
CC&R's. Tenant shall also have the right to use the Building shafts, risers
and/or conduits within the Building (including the roof) for the installation
and maintenance of conduits, cables, ducts, flues, pipes and other devices for
communications, data processing devices, supplementary HVAC (if necessary) and
other facilities consistent with Tenant's use of the Building and the Premises.
Tenant shall also have the right to install and maintain a back-up generator and
enclosure for support of its communications and data systems.

            29.29.2  Maintenance and Repair.  Tenant shall maintain, repair or
                     ----------------------
replace Communications Equipment, at Tenant's sole cost and expense. During the
Lease Term, Tenant shall have the obligation to repair all damage to the
Building rooftop caused by the installation, repair, maintenance and use of the
Communications Equipment. Further, Tenant shall have the obligation to repair
any damage to the Building rooftop caused by Tenant's Communications Equipment,
reasonable wear and tear, casualty and repairs which are specifically made the
responsibility of Landlord hereunder excepted.

            29.29.3  Termination.  Tenant shall be entitled at any time to
                     -----------
terminate such use of space on the roof, in which case Tenant shall be relieved
of all of its obligations to pay any utilities and/or maintenance charges
attributable to the operation of Tenant's Communications Equipment upon removal
of all such equipment from the roof of the Building by Tenant. Upon Tenant's
termination of the use of space on the roof and removal of its Communications
Equipment therefrom, Tenant shall have the obligation to repair all damage to
the Building rooftop caused by such removal of the Communications Equipment,
reasonable wear and tear, casualty and repairs which are specifically made the
responsibility of Landlord under this Lease excepted.

                Remainder of page is intentionally left blank.
<PAGE>

          IN WITNESS WHEREOF, Landlord and Tenant have caused this Lease to be
executed the day and date first above written.

                    Landlord:

                    Fund VIII and Fund IX Associates,
                    a Georgia joint venture

                    By:  Wells Real Estate Fund IX, L.P.,
                         a Georgia limited partnership, general partner

                    By:  Wells Capital, Inc.,
                         a Georgia corporation, general partner

                         By: /s/ Douglas P. Williams
                             ------------------------------------
                         Name:  Douglas P. Williams
                         Title: Senior Vice President

                    TENANT:

                    QUEST SOFTWARE, INC.

                         By:  /s/ David Doyle
                            -------------------------------------
                         Name: David Doyle
                              -----------------------------------
                         Title:  President
                               ----------------------------------
<PAGE>

                                   EXHIBIT A

                           LEGAL DESCRIPTION OF LAND

THE LAND REFERRED TO IN THIS POLICY IS SITUATED IN THE STATE OF CALIFORNIA,
COUNTY OF ORANGE, CITY OF IRVINE, AND IS DESCRIBED AS FOLLOWS:

PARCEL 1 AS SHOWN ON A PARCEL MAP NO. 82-620 FILED IN BOOK 177, PAGES 19 AND 20
OF PARCEL MAPS IN THE  OFFICE OF THE COUNTY RECORDER OF SAID COUNTY.

EXCEPT ANY AND ALL OIL, OIL RIGHTS, MINERALS, MINERAL RIGHTS, NATURAL GAS
RIGHTS, AND OTHER HYDROCARBONS BY WHATSOEVER NAME KNOWN, GEOTHERMAL STEAM, AND
ALL PRODUCTS DERIVED FROM ANY OF THE FOREGOING, THAT MAY BE WITHIN OR UNDER THE
LAND, TOGETHER WITH THE PERPETUAL RIGHT OF DRILLING, MINING, EXPLORING, AND
OPERATING THEREFOR, AND STORING IN AND REMOVING THE SAME FROM THE LAND OR ANY
OTHER LAND, INCLUDING THE RIGHT TO WHIPSTOCK OR DIRECTIONALLY DRILL AND MINE
FROM LANDS OTHER THAN THOSE CONVEYED HEREBY, OIL OR GAS WELLS, TUNNELS AND
SHAFTS INTO, THROUGH OR ACROSS THE SUBSURFACE OF THE LAND, AND TO BOTTOM SUCH
WHIPSTOCKED OR DIRECTIONALLY DRILL WELLS, TUNNELS AND SHAFTS UNDER AND BENEATH
OR BEYOND THE EXTERIOR LIMITS THEREOF, AND TO REDRILL, RETUNNELL, EQUIP,
MAINTAIN, REPAIR, DEEPEN AND OPERATE ANY SUCH WELLS OR MINES, WITHOUT, HOWEVER,
THE RIGHT TO DRILL, MINE, STORE, EXPLORE AND OPERATE THROUGH THE SURFACE OR THE
UPPER 500 FEET OF THE SUBSURFACE OF THE LAND, AS RESERVED IN THE DEED FROM THE
IRVINE COMPANY, A MICHIGAN CORPORATION, SUCCESSOR BY MERGER WITH IRVINE
INDUSTRIAL COMPLEX RECORDED MARCH 30, 1979, IN BOOK 13086, PAGE 1979 OFFICIAL
RECORDS.

EXCEPT ANY AND ALL WATER, RIGHTS OR INTERESTS THEREIN, NO MATTER HOW ACQUIRED IN
CONNECTION WITH OR WITH RESPECT TO SAID LAND, TOGETHER WITH THE RIGHT AND POWER
TO EXPLORE, DRILL, REDRILL, REMOVE AND STORE THE SAME FROM THE LAND OR TO DIVERT
OR OTHERWISE UTILIZE SUCH WATER, RIGHTS OR INTEREST ON ANY OTHER PROPERTY OWNED
OR LEASED BY GRANTOR, WHETHER SUCH WATER RIGHTS SHALL BE RIPARIAN, OVERLYING,
APPROPRIATIVE, PERCOLATING, LITTORAL, PRESCRIPTIVE, ADJUDICATED, STATUTORY OR
CONTRACTUAL, BUT WITHOUT, HOWEVER, ANY RIGHT TO ENTER UPON THE SURFACE OF SAID
LAND IN THE EXERCISE OF SUCH RIGHTS, AS RESERVED IN THE DEED FROM THE IRVINE
COMPANY, A MICHIGAN CORPORATION, SUCCESSOR BY MERGER WITH IRVINE INDUSTRIAL
COMPLEX, A CORPORATION, RECORDED MARCH 30, 1979, IN BOOK 13086, PAGE 1979,
OFFICIAL RECORDS.
<PAGE>

                                   EXHIBIT B
                              TENANT IMPROVEMENTS

     1.   The Premises shall be delivered to and accepted by Tenant in its
existing condition.

     2.   Tenant shall select an architect and contractor approved by Landlord
to prepare plans and specifications for  and to construct the leasehold
improvements desired by Tenant. Landlord acknowledges that it has approved
Gensler as architect and either Nexus Construction Services, Inc. or Turelk,
Inc. as the contractor. The plans and specifications shall be submitted to
Landlord for approval, which approval shall not be unreasonably withheld or
delayed. To facilitate Landlord's approval of Tenant's architect and contractor,
Tenant shall obtain and furnish to Landlord an AIA qualification statement and
insurance certificate.

     3.   Landlord will provide Tenant with an allowance of up to $11.00 per
square foot of rentable area in the Premises to be applied to the costs actually
incurred by Tenant in improving such space.  Such allowance must be applied to
the actual cost of permanent leasehold requirements in the space, not including
cabling and wiring, all in accordance with the approved plans and
specifications, and no portion of such allowance may be utilized for Tenant's
owned property or other similar expenses.

     4.   (a)  Wells Management Company, Inc. shall receive a construction
management fee of $10,405 as consideration for its construction oversight, which
amount shall be deducted from the allowance.

          (b)  The balance of the aforesaid allowance shall be disbursed by
Landlord to Tenant from time to time subject to and conditioned upon Tenant's
fulfillment of the following conditions for disbursement.

               (c)  From time to time after the date of execution of this Lease,
Tenant shall submit to Landlord a request for funds ("Request for Funds"),
containing a statement by or on behalf of Tenant setting forth the amount of
disbursement sought with an itemized breakdown of those expenses comprising such
requested disbursement and accompanied by (i) documentary evidence satisfactory
to Landlord confirming the expenditures identified in the Request for Funds, and
(ii) to the extent any such expenditures are for the payment for labor performed
on and/or materials stored on or incorporated into any work on the Premises,
lien release waivers in form and content satisfactory to Landlord and executed
by each engineer, contractor, subcontractor, supplier and materialman to be paid
pursuant to the Request for Funds and covering all labor, services, equipment
and materials to be paid thereunder.

          (d)  Upon verification of the accuracy of a Request for Funds,
including by Landlord's inspection of the Premises, or otherwise, which
verification shall occur no later than 10 business days after receipt by
Landlord of the Request for Funds and accompanying materials, and upon
satisfaction of all applicable conditions contained herein, Landlord shall make
disbursements to Tenant.

         (e)   Final disbursement shall, in addition to the other requirements
set forth herein, be subject to receipt by Landlord of a certificate of
occupancy allowing Tenant to occupy the Premises without restriction.

     5.   Tenant shall indemnify and hold Landlord harmless from and against any
and all losses, damages, costs (including attorneys' fees), liabilities, liens
or claims of liens, or causes of action arising out of or relating to the work
of Tenant and its contractors in connection with the construction of its Tenant
Improvements.
<PAGE>

                                   EXHIBIT C
                          DIRECT EXPENSES EXCLUSIONS

     1.   Exclusions From Direct Expenses.  Despite any other provision of
          -------------------------------
Article 4 of the Lease, and except as otherwise expressly permitted by the
Lease, Direct Expenses shall not include:

          (a)  Depreciation, interest, or amortization on mortgages or ground
lease payments, except as otherwise expressly permitted by the terms of the
Lease.

          (b)  Real estate brokers' leasing commissions.

          (c)  Initial improvements or alterations to tenant spaces.

          (d)  Any costs expressly excluded from Direct Expenses elsewhere in
the Lease.

          (e)  Costs of any items for which Landlord receives reimbursement from
insurance proceeds or a third party. Insurance proceeds shall be excluded from
Direct Expenses in the year in which they are received, except that any
deductible amount under any insurance policy shall be included within Direct
Expenses.

          (f)  Costs of capital improvements, except as otherwise stated in
Section 7.1.1.

          (g)  Interest, principal, depreciation, attorney fees, costs of
environmental investigations or reports, points, fees, and other lender costs
and closing costs on any mortgage or mortgages, ground lease payments, or other
debt instrument encumbering the Building or Real Property.

          (h)  Insurance premiums to the extent of any refunds of those
premiums, and insurance deductibles in excess of commercially reasonable levels
for Comparable Buildings.

          (i)  Costs, fees, and compensation paid to Landlord, or to Landlord's
subsidiaries or affiliates, for services in or to the Building, or for supplies
or other materials, to the extent that they exceed the charges for comparable
services or supplies rendered by an unaffiliated third party of comparable
skill, competence, stature, and reputation.

          (j)  Management fees in excess of the sum of (i) administrative
salaries of $7,392 for the first Lease Year, increasing by 2.5% in each
subsequent Lease Year, (ii) liability insurance maintained by Landlord pursuant
to Section 10.2, and (iii) 10% of the costs described in subparagraphs (i) and
(ii).

          (k)  counting and audit fees, except as otherwise provided in Sections
4.5 and 14.4.

     2.   Adjustment of Taxes.  For purposes of this Lease, Tax Expenses
          -------------------
attributable to any Expense Year shall be the amount of Tax Expenses assessed
for that year. If Landlord later receives any supplemental or additional
assessment for any such Expense Year, Tenant shall pay Landlord, within thirty
(30) days after the date of the invoice for this assessment, Tenant's Share of
the supplemental or additional assessment. If, by the beginning of the last year
of the Lease Term, the Real Property has not been fully assessed for any year
during the Lease Term, Tax Expenses shall be adjusted to the Tax Expenses that
would have been payable in such year or years if the Real Property had been
fully assessed. These provisions shall survive the Lease Expiration Date or
other termination of this Lease.
<PAGE>

                                   EXHIBIT D
                             RULES AND REGULATIONS

Tenant shall faithfully observe and comply with the following Rules and
Regulations.

1.   Except as otherwise provided in Article 23 of this Lease, no sign, placard,
picture, advertisement, name or notice shall be inscribed, displayed or printed
or affixed on or to any part of the outside of the Building without the prior
written consent of Landlord. Landlord shall have the right to remove any such
sign, placard, picture, advertisement, name or notice, unless Landlord has given
written consent, without notice to and at the expense of Tenant. Landlord shall
not be liable in damages for such removal unless the written consent of Landlord
had been obtained.

2.   Tenant, upon the termination of its tenancy, shall deliver to Landlord all
keys, magnetic locks, security systems (if not removed by Tenant), etc. of
offices, rooms and toilet rooms which shall have been furnished to Tenant or
which Tenant shall have made.

3.   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 shall be borne by Tenant.

4.   Tenant shall not use the Premises in any manner which exceeds the floor
load design capacity of the floor on which the Premises are located.

5.   Tenant agrees that its use of electrical current shall never exceed the
capacity of the existing base Building feeders, risers or wiring installation.

6.   No part of the Building or Premises shall be used for gambling, immoral or
other unlawful purposes. No birds or animals of any kind shall be brought into
the Building (other than trained assist dogs required to be used by the visually
impaired).

7.   The sidewalks, entrances, passages, corridors, halls, elevators, and
stairways in the Building and on the Real Property shall not be used for any
purposes other than those for which same were intended as ingress and egress.
Tenant shall use reasonable efforts to see that the doors of the Premises are
closed and securely locked before leaving the Building and to cause all water
apparatus (i.e. kitchen sinks and appliances, restroom fixtures, water
fountains, etc.) to be entirely shut off before Tenant or Tenant's employees
leave the Building, so as to prevent waste or damage.

8.   Landlord shall have the right to prohibit any advertising by Tenant which
utilizes Landlord's name, or a picture or visual rendition of the Building but
only to the extent which the same tends, in Landlord's reasonable discretion, to
impair the reputation of the Building or its desirability as a location for
offices and other permitted uses, and upon written notice from Landlord, Tenant
shall refrain from or discontinue such advertising.

9.   In the event of any conflict between the provisions of these Rules and
Regulations and the other provisions of this Lease, the other provisions of this
Lease shall control.
<PAGE>

                                   EXHIBIT E

     1.   Covenants, Conditions and Restrictions in an instrument recorded
September 29, 1978 in Book 12864, page 63 of Official Records, as amended by
documents declaring modifications thereof recorded in Book June 5, 1979 13173,
page 1210 of Official Records and recorded May 21, 1980 in Book 13613, page 322
of Official Records.

     2.   Easements, Covenants and Conditions contained in the Deed by and
between The Irvine Company, as Grantor, and SAN/BAR Corporation, as Grantee,
recorded March 30, 1979 in Book 13086, page 1976 of Official Records.

     3.   The Terms, Provisions and Conditions contained in a document entitled
"Declaration of Special Land Use Restrictions ("Regulations"), Abatement Lien,
Mortgage Lien and Option to Repurchase", executed by and between The Irvine
Company and SAN/BAR Corporation, recorded March 30, 1979 in Book 13086, page
1979 of Official Records.

     4.   The Terms, Provisions and Conditions contained in a document entitled
"Reciprocal Easement Agreement", executed by and between The Irvine Company,
Crow IIC East, SAN/BAR Corporation and CB Institutional Fund IV, recorded
January 6, 1982 as Instrument No. 82-004179 of Official Records.

     5.   Covenants, Conditions and Restrictions in an instrument recorded
January 11, 1984 as Instrument No. 84-014634 of Official Records.
<PAGE>

                                   EXHIBIT F

                     FORM OF TENANT'S ESTOPPEL CERTIFICATE

     The undersigned as Tenant under that certain Office Lease (the "Lease")
made and entered into as of __________, 2000, and between FUND VIII AND FUND IX
ASSOCIATES, a Georgia joint venture partnership, as Landlord, and the
undersigned as Tenant, for Premises being the entire Office Building located at
15253 Bake Parkway, Irvine, California certifies as follows:

     1.   Attached hereto as Exhibit A is a true and correct copy of the Lease
and all amendments and modifications thereto. The documents contained in Exhibit
A represent the entire agreement between the parties as to the Premises.

     2.   The undersigned has commenced occupancy of the Premises described in
the Lease, currently occupies the Premises, and the Lease Term commenced on
_________.

     3.   The Lease is in full force and effect and has not been modified,
supplemented or amended in any way except as provided in Exhibit A.

     4.   Tenant has not transferred, assigned, or sublet any portion of the
Premises nor entered into any license or concession agreements with respect
thereto except as follows:

     5.   Base Rent became payable on _______________.

     6.   The Lease Term expires on _________________.

     7.   To the actual knowledge of Tenant, without investigation or inquiry
and except as specified herein, all conditions of the Lease to be performed by
Landlord necessary to the enforceability of the Lease have been satisfied and
Landlord is not in default thereunder.

     8.   No rental has been paid more than thirty (30) days in advance and no
security has been deposited with Landlord except as provided in the Lease.

     9.   To the actual knowledge of Tenant, without investigation or inquiry
and except as specified herein, as of the date hereof, there are no existing
defenses or offsets that the undersigned has, which preclude enforcement of the
Lease by Landlord.

     10.  All monthly installments of Base Rent, all Additional Rent and all
monthly installments of estimated Additional Rent have been paid when due
through _________________. The current monthly installment of Base Rent is
$__________. The current monthly installment of Additional Rent is
$____________.

     11.  The undersigned acknowledges that this Estoppel certificate may be
delivered to Landlord's prospective mortgagee, or a prospective purchaser, and
acknowledges that it recognizes that if same is done, said mortgagee,
prospective mortgagee, or prospective purchaser will be relying upon the
statements contained herein in making the loan or acquiring the property of
which the Premises are a part, and in accepting an assignment of the Lease as
collateral security, and that receipt by it of this certificate is a condition
of making of the loan or acquisition of such property.

     Executed at ____________ on the ____ day of ____________, ____.

                         "Tenant":

                         QUEST SOFTWARE, INC., a California corporation

                         By:   _________________________

                         Its:  _________________________
<PAGE>

                                   EXHIBIT G

                               BUILDING SIGNAGE

     The building signage shall comply with the Covenants, Conditions and
Restrictions and all applicable regulations of the City of Irvine, and shall
meet with Landlord's approval, which approval shall not be unreasonably withheld
or delayed.<PAGE>

                                                                    Exhibit 10.1
                             JERI-JO KNITWEAR, INC.
                         (formerly JJ Acquisition Corp.)
                          McNAUGHTON APPAREL GROUP INC.
                       (formerly Norton McNaughton, Inc.)
                               463 Seventh Avenue
                               New York, NY 10018

                                                     August 29, 2000

Susan Schneider
Leslie Schneider
Scott Schneider
c/o Currants
1407 Broadway
Suite 2909
New York, NY  10018

      Re:   Agreement of Purchase and Sale dated as of April 15, 1998, as
            amended (the "Agreement"), by and among JJ Acquisition Corp. (now
            Jeri-Jo Knitwear, Inc.), Norton McNaughton, Inc. (now McNaughton
            Apparel Group Inc.), Jeri-Jo Knitwear Inc., Jamie Scott, Inc. and
            the Stockholders of Jamie Scott, Inc.
            -----------------------------------------------------------------

Ladies and Gentlemen:

                  Reference is made to the Agreement. Capitalized terms used and
not defined below shall have the meanings assigned to such terms in the
Agreement. For good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the parties hereto hereby amend the Agreement as
set forth below.

      1. Section 2.02(d)(A)(i)(1) of the Agreement is amended by deleting the
reference therein to "$95,000,000 (the "Initial Payment")" and replacing it with
a reference to "$65,000,000 (the "First Initial Payment")".

      2. Section 2.02(d)(A)(ii) of the Agreement is hereby deleted in its
entirety and amended to read as follows:

      "(ii) as a condition to the Purchaser's and Norton's obligations under
      clause (A)(iii) below, simultaneously with the delivery of the Second
      Initial Payment (as defined in clause (A)(iii) below), the Stockholder
      Representative shall deliver the Earn Out Letter of Credit to Norton for
      cancellation."
<PAGE>

      3. Section 2.02(d) of the Agreement is amended to add thereto a new
subclause (A)(iii) as follows:

      "(iii) At or before 3:00 p.m. on October 2, 2000 (time being of the
      essence), the Purchaser and Norton shall pay $30,000,000 (the "Second
      Initial Payment"; the Second Initial Payment, together with the First
      Initial Payment, collectively, the "Initial Payment"), together with
      interest on the unpaid amount of the Second Initial Payment until paid at
      a rate per annum equal to 8.25% computed for the actual number of days
      elapsed during the period from and including August 29, 2000 to but
      excluding the date of the payment and on the basis of a 360-day year, to
      the Designees by wire transfer of immediately available funds to a bank
      account(s) designated by the Designees."

      4. Each of Section 2.02(d)(B)(i)(i) and Section 2.02(d)(C)(i)(i) of the
Agreement is hereby amended to delete from each such Section the phrase
"subsection (A)(i)(1) above" and replacing it in each such Section with a
reference to "subsections (A)(i)(1) and (A)(iii) above".

      5. Paragraph 10 of the Amendment to the Agreement dated as of August 3,
2000 (the "August Amendment") is hereby deleted in its entirety and shall be of
no further force or effect. The parties hereto acknowledge and agree that the
Earn Out Payment under the Agreement (as amended by the August Amendment and
hereby) is $190,000,000, which shall be payable by the Purchaser and Norton, and
shall be fully satisfied by the payment by the Purchaser and Norton, as provided
in Section 2.02(d)(B)(i) (on a discounted basis) or Section 2.02(d)(C)(i), as
applicable, of the Agreement (as amended by the August Amendment and hereby).
The parties acknowledge and agree that, in the event that the Purchaser and
Norton default in their obligations under Section 2.02(d)(A)(iii) of the
Agreement (as amended by the August Amendment and hereby), in addition to any
other rights of the Designees upon default by the Purchaser and Norton under the
Agreement, (A) the cash amount payable under Section 2.02(d)(A)(iii) of the
Agreement (as amended by the August Amendment and hereby) shall constitute, and
be deemed and construed for all purposes to be, an "Earn Out Payment in excess
of the Stock Earn Out Amount," (B) no dispute exists with respect thereto (other
than any non-payment that may occur as and when due), (C) in the event of any
non-payment of such amount as and when due the beneficiary under that certain
Letter of Credit No. 933394 dated June 18, 1998, as amended, issued by Bank of
America, N.A. (formerly known as NationsBank, N.A.), shall be entitled to draw
thereunder in the overdue amount (subject to the maximum amount of such Earn Out
Letter of Credit), and (D) such non-payment would be properly described by
checking the second certification box (in respect of the "Second Amount") in
submitting the Irrevocable Letter of Credit Certificate substantially in the
form of Exhibit B to such Earn Out Letter of Credit. Notwithstanding anything to
the contrary contained herein, in the Agreement or in the August Amendment,
provided that the Purchaser and Norton comply with each of the provisions of
Section 2.02(d)(A)(i) of the Agreement (as amended by the August Amendment and
hereby), each of the Designees and the Stockholder Representative (as the
beneficiary under the Earn Out Letter of Credit) hereby acknowledge and agree
with the Purchaser and Norton that the Stockholder Representative (as the
beneficiary under the Earn Out Letter of Credit) is not entitled to draw, and
accordingly agree not to draw, and the Designees agree to cause the Stockholder
Representative not to draw, any amount under the Earn Out Letter of Credit
unless and until there has occurred a default by the Purchaser and Norton
pursuant to Section 2.02(d)(A)(iii) of the Agreement (as amended by the August
Amendment and hereby).

      6. Except as amended by this amendment, the Agreement and the August
Amendment are hereby ratified and confirmed in all respects. Nothing in this
amendment shall confer or deemed to confer any right, remedy, benefit or
entitlement to any third party (other than the Designees). This amendment shall
be construed pursuant to and in accordance with the laws of the State of New
York, without regard to conflict of law principles, and may be executed in
counterparts, including by telecopy, each of which shall be deemed an original,
and all of which taken together shall constitute one and the same amendment.

                                      * * *
<PAGE>

                                            Very truly yours,

                                            JERI-JO KNITWEAR, INC.
                                            MCNAUGHTON APPAREL GROUP INC.

                                            By:  /s/ Amanda J. Bokman
                                                 --------------------
                                                 Name: Amanda J. Bokman

Agreed as of the date first above written:

/s/ Susan Schneider
-------------------
    Susan Schneider, for herself
    and as the beneficiary under the
    Earn Out Letter of Credit

/s/ Leslie Schneider
-------------------
    Leslie Schneider

/s/ Scott Schneider
-------------------
    Scott Schneider

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