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                              EXTENSION AGREEMENT
                              -------------------

EXTENSION AGREEMENT to be attached to and form a part of lease (which together
with any amendments, modifications and extensions there of is hereinafter called
the Lease), made the 23rd day of March, 1993 between SPIEKER FRENCH #130,
LIMITED PARTNERSHIP, A TEXAS LIMITED PARTNERSHIP, as Landlord and TANDEM
COMPUTERS INCORPORATED, A DELAWARE CORPORATION, as Tenant covering the premises
known as 10590 N. Tantau Avenue, Cupertino, California.

Witnesseth that the Lease is hereby renewed and extended for a further term of
five (5) years to commence on the first day of May, 1993, and to end on the
thirtieth day of April, 1998, on condition that Landlord and Tenant comply with
all the provisions of the covenants and agreements contained in the Lease,
except:

1)   Rental:                  Rental for the premises shall be:

                              Months 1 - 30:  $41,151.00 per month plus
                                              operating expenses per Paragraph 7
                                              and Addendum 5 of this Lease
                                              Agreement.

                              Months 31 - 60: $46,089.00 per month plus
                                              operating expenses per Paragraph 7
                                              and Addendum 5 of this Lease
                                              Agreement.

2)   Term and Possession:     Landlord shall not be required to provide tenant
                              improvements.

3)   Additional Paragraph 37 shall be amended to read as follows:

     Provided Tenant is not, and has not been, in default of its obligations
     under this Lease, Tenant shall have an option to re-lease the Premises in
     "as-is" condition for a term of five (5) years at the then current market
     rent (for comparable one-story office space in the Vallco Park, Cupertino
     area).  In no event will the monthly rental be less than the rental for the
     last month of the previous term.

     Tenant shall give Landlord written notice of its intent to exercise its
     option at least one hundred eighty (180) days prior to the expiration of
     the current lease term.  Within fifteen (15) days after Tenant exercises
     its option to re-lease, Landlord will provide Tenant with the current
     market rental, as determined by landlord for the extended term.  Tenant
     shall have forty five (45) days from notification by Landlord of option
     rent to accept Landlord's current market rent.

     The parties are obligated to negotiate in good faith to agree on the market
     rental for the five (5) year rental adjustment.  If the parties have not
     mutually agreed on the market rental adjustment for the five (5) year
     period provided herein within forty five (45) days from notification by
     Landlord to Tenant of Landlord's rental determination, each party hereon
     shall appoint one representative who shall be a licensed real estate broker
     experienced in the leasing of office space in the County of Santa Clara to
     act as an arbitrator.  The two (2) arbitrators so appointed shall determine
     the current rental value for the subsequent five (5) years for the use to
     which Tenant is then utilizing the lease Premises pursuant to the terms and
     conditions of this Lease.  The determination of said current rental value
     shall be made by said two (2) arbitrators within ninety (90) days from
     notification by Landlord to Tenant of Landlord's rental determination and
     they shall submit said determination in writing and signed by said
     arbitrators in duplicate.  One of the written notifications shall be
     delivered to Landlord and the other to Tenant.

     In the event the two (2) arbitrators of the parties hereto cannot agree on
     the current rental value for the Premises herein, said two (2) arbitrators
     shall appoint a third arbitrator who shall be a licensed real estate broker
     experienced in the leasing of office space in the County of Santa Clara to
     act as an arbitrator.  The current rental value for the subsequent five (5)
     year period shall be independently determined by the third of said
     arbitrators, which said determination shall be made within one hundred
     twenty (120) days from notification by Landlord to Tenant of Landlord's
     rental determination.  The role of the third arbitrator shall ten be to
     immediately select from the proposed resolution of arbitrators #1 and #2
     the one that most closely approximates the third arbitrator's determination
     of market rental value.  The third arbitrator shall have no right to adopt
     a compromise or middle ground or any modification of either of the two
     final proposed resolutions. 
<PAGE>
 
     The resolution the third arbitrator chooses as most closely approximating
     his determination of the questions in issue shall constitute the decision
     and award of the arbitrators and be final and binding upon the parties.

     The parties hereto shall pay the charges of the arbitrator appointed by him
     and any expenses incurred by such arbitrator.  The charges and expenses of
     the third arbitrator, as provided herein, shall be paid by the parties
     herein equal shares.

     In the event either arbitrator #1 or arbitrator #2 fails to present a
     market rental figure within the thirty (30) day period, the rental
     presented by the other arbitrator shall be considered final and binding on
     both parties.

     In the event the third arbitrator fails to present a current market rent
     within the thirty (30) day period, then by mutual consent of Landlord and
     Tenant:

     (a)  The time period shall be extended, or
     (b)  If Landlord or Tenant do not wish to extend the period, a fourth
          arbitrator shall be selected by arbitrator #1 and arbitrator #2 and a
          new thirty (30) day period shall begin.

     Notwithstanding anything to the contrary herein contained, Tenant's right
     to extend the term by exercise of the foregoing option shall be conditioned
     upon the following:  at the time of exercise of the option, and at the time
     of the commencement of the extended term, Tenant shall be in possession of
     and occupying the Premises for the conduct of its business therein and the
     same shall not be occupied by any assignee, subtenant or licensee.  In no
     event will the monthly rental be less than the rental for the last month of
     the previous term.

4)   Addendum No. 3 to Paragraph 7A(1) Basic Operating Costs of the Lease
     Agreement dated January 26, 1988 shall be amended to read as follows:

     Notwithstanding anything to the contrary contained herein, Tenant shall
     not, during the term of the Lease, be liable for increases in real property
     taxes that result from a sale of the Project by Landlord.  This cap on real
     property taxes shall be applicable only to this sixty (60) month period and
     shall not be applicable in the event of a sale of the Project to Tandem
     Computers, Inc. during this period.

IT WITNESS WHEREOF, the parties hereto have signed and sealed this Extension
Agreement this 23rd day of March, 1993.

LANDLORD:                                         TENANT:
Spieker French #130, Limited Partnership,         Tandem Computers Incorporated,
a Texas Limited Partnership                       a Delaware Corporation


By:  /s/ John K. French                           By: /s/
   ------------------------------------              ---------------------------

Its:   general partner                            Its:__________________________
    ----------------------------------- 
<PAGE>
 
LEASE AMENDMENT NUMBER ONE TO THE LEASE AGREEMENT DATED JANUARY 26, 1988,
BETWEEN SPIEKER FRENCH #130, LIMITED PARTNERSHIP, A TEXAS LIMITED PARTNERSHIP,
AS LANDLORD, AND TANDEM COMPUTERS INCORPORATED, A DELAWARE CORPORATION, AS
TENANT, FOR PREMISES LOCATED AT 10590 TANTAU AVENUE, CUPERTINO, CALIFORNIA.

Effective February 5, 1990, the above described Lease Agreement shall be
modified as follows.

1.   Addendum 6.  Paragraph 8C.  Indemnification of the Lease Agreement shall be
     deleted in its entirety and replaced with Addendum 6 below.

     Addendum 6.  Paragraph 8C.  Indemnification for Toxic/Hazardous Materials
     -------------------------------------------------------------------------

     Landlord shall indemnify Tenant, and hold harmless Tenant, its officers,
     agents, employees, shareholders, parent, subsidiary and affiliate
     organizations against all liability, claims, loss, cost damages, charges
     and expenses (including reasonable attorneys' fees, clean-up costs, cost of
     court and expenses necessary in the prosecution or defense of any
     litigation) by reason of injury to person or property, including any
     liability for injury to person or property of Landlord, its agents,
     servants, employees or invitees, while in or on the leased Premises during
     the term of this Lease resulting from the negligence of Landlord, its
     agents, servants, employees, invitees or authorized representatives.

     Tenant shall indemnify Landlord and hold harmless Landlord, its officers,
     agents, employees, partners, subsidiary and affiliate organizations against
     any claims, suits, loss, costs (including attorneys' fees and clean-up
     costs), damage or liability by reason of property damage (including the
     property of Landlord) or personal injury (including death) to the extent
     the same results from pollution or toxic contamination (i)(A) originating
     on property which is not leased, owned or otherwise used or controlled by
     Tenant and (B) which migrated through the air, groundwater or otherwise to
     the Premises, or (ii) which was present on the Premises on the date of
     Tenant's first occupancy of the Premises and was not caused by Tenant or
     its agents.

     As used in this section, "Premises" means the real property which is the
     subject matter of this Lease and the adjoining real property, commonly
     known as 10600 North Tantau Avenue, 19020 Pruneridge Avenue, Cupertino,
     which adjoining real property is also currently leased to Tenant.

2.   The following sentence shall become the last sentence of Paragraph 7A(4):

     Tenant shall be permitted, at its option, to perform landscape maintenance,
     so long as such maintenance is performed to Landlord's complete
     satisfaction.

Dated:  February 5, 1990

IN WITNESS WHEREOF, this Amendment has been duly executed by the parties hereto
as of the day and year first above written.

LANDLORD: SPIEKER-FRENCH #130              TENANT: TANDEM COMPUTERS, INC.


/s/                                        /s/
------------------------------------       ----------------------------------
By: John K. French, General Partner        By: Frank Robinson, Director,
                                                Corporate Real Estate and 
                                                 Construction
<PAGE>
 
                            BASIC LEASE INFORMATION

LEASE DATE:                   January 26, 1988

TENANT:                       Tandem Computers Incorporated, a Delaware
                              Corporation

ADDRESS OF TENANT:            19191 Vallco Parkway, LOC 4-04
                              Cupertino, CA  95014-0708

LANDLORD:                     Spieker-French #130, Limited Partnership, a Texas
                              Limited Partnership

ADDRESS OF LANDLORD:          2180 Sand Hill Road, Suite 200
                              Menlo Park, CA  94025

Project Description:          That two (2) building complex totaling 64,680
                              rentable square feet situated on 4.46 acres of
                              land commonly known as the Cupertino Technology
                              Center, Cupertino, California. The project is
                              shown outlined in green on Exhibit "A".

Building Description:         That 41,151 square feet one story building known
                              as 10590 Tantau Avenue. The Building is shown
                              outlined in blue on Exhibit "A".

Premises:                     That entire 41,151 square foot one story building
                              known as 10590 Tantau Avenue. The Premises are
                              outlined in red on Exhibit "A".

Permitted Use:                General Office, including computer sales, service
                              and other related legal purposes.

Occupancy Density:            One person per 250 rentable square feet.

Scheduled Term
Commencement Date:            April 1, 1988
 
Length of Term:               Sixty (60) months
 
Rent:
 
   Base Rent:                 See Addendum 2         $_________________per month
 
   Estimated First Year Basic Operating Cost:        $      9,835      per month
                                                      -----------------

Security Deposit:             None

Tenant's Proportionate Share: 63.62%


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

                                      -4-
<PAGE>
 
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                           Page
<S>                                                                        <C>
      Basic Lease Information...............................................  1
      Table of Contents.....................................................  2
 1.   Premises..............................................................  3
 2.   Possession and Lease Commencement.....................................  3
 3.   Term..................................................................  3
 4.   Use...................................................................  3
 5.   Rules and Regulations.................................................  3
 6.   Rent..................................................................  3
 7.   Basic Operating Cost..................................................  4
 8.   Insurance and Indemnification.........................................  5
 9.   Waiver of Subrogation.................................................  5
10.   Landlord's Repairs and Services.......................................  5
11.   Tenant's Repairs......................................................  5
12.   Alterations...........................................................  5
13.   Signs.................................................................  6
14.   Inspection/Posting Notices............................................  6
15.   Utilities.............................................................  6
16.   Subordination.........................................................  6
17.   Financial Statements..................................................  6
18.   Estoppel Certificate..................................................  6
19.   Security Deposit......................................................  6
20.   Tenant's Remedies.....................................................  6
21.   Assignment and Subletting.............................................  7
22.   Quiet Enjoyment.......................................................  7
23.   Condemnation..........................................................  7
24.   Casualty Damage.......................................................  7
25.   Holding Over..........................................................  8
26.   Default...............................................................  8
27.   Liens.................................................................  9
28.   Substitution..........................................................  9
29.   Transfers by Landlord.................................................  9
30.   Right of Landlord to Perform Tenant's Covenants.......................  9
31.   Waiver................................................................  9
32.   Notices...............................................................  9
33.   Attorneys' Fees.......................................................  9
34.   Successors and Assigns................................................  9
35.   Force Majeure.........................................................  9
36.   Miscellaneous.........................................................  9
37.   Additional Provisions................................................. 10

EXHIBIT "A"........................................ Site Plan, Legal Description
EXHIBIT "B"...............................Tenant Improvements and Specifications
</TABLE> 

                                      -5-
<PAGE>

               -----------------------------------------------------------------
                                     LEASE
 
               THIS LEASE is made as of this 26th day of January, 1988 between
               Spieker-French #130, Limited Partnership, a Texas Limited
               Partnership (hereinafter called "Landlord") and Tandem Computers
               Incorporated, a Delaware Corporation (hereinafter called
               "Tenant").

      PREMISES 1.   Landlord leases to Tenant and Tenant leases from Landlord,
                    upon the terms and conditions hereinafter set forth, those
                    premises (the "Premises") outlined in red on Exhibit "A" and
                    described in the Basic Lease Information. The Premises may
                    be all or part of the building (the "Building") or of the
                    project (the "Project") which may consist of more than one
                    building. The Building and Project are outlined in blue and
                    green respectively on Exhibit "A".

POSSESSION AND 2.
         LEASE
  COMMENCEMENT
 
See Addendum 1

          TERM 3.   The Term of this Lease shall commence on the Term
                    Commencement date and continue in full force and effect for
                    the number of months specified as the Length of Term in the
                    Basic Lease Information or until this Lease is terminated as
                    otherwise provided herein. If the Term Commencement Date is
                    a date other than the first day of the calendar month, the
                    term shall be the number of months of the Length of Term in
                    addition to the remainder of the calendar month following
                    the Term Commencement Date.

           USE 4.   A.  Tenant shall use the Premises for the Permitted Use and
                    for no other use or purpose without prior written consent of
                    Landlord. No increase in the Occupant Density of the
                    Premises shall be made without the prior written consent of
                    Landlord. Tenant and its employees, customers, visitors, and
                    licensees shall have the nonexclusive right to use, in
                    common with other parties occupying the Buildings or
                    Project, the parking areas and driveways of the project,
                    subject to such reasonable rules and regulations as Landlord
                    may from time to time prescribe.

                    B.  Tenant shall not permit any odors, smoke, dust, gas,
                    substances, noise or vibrations to emanate from the
                    Premises, nor take any action which would constitute a
                    nuisance or would disturb, obstruct or endanger any other
                    tenants of the Building or Project in which the Premises are
                    situated or unreasonably interfere with their use of their
                    respective premises. Tenant shall not receive, store or
                    otherwise handle any product, material or merchandise which
                    is toxic, harmful, explosive, highly inflammable or
                    combustible. Storage outside the Premises of materials or
                    vehicles is prohibited without Landlord's prior written
                    consent. Tenant shall not use or allow the Premises to be
                    used for any improper or unlawful purpose, nor shall Tenant
                    cause or maintain or permit any nuisance in, on or about the
                    Premises. Tenant shall not commit or suffer the commission
                    of any waste in, on or about the Premises. Tenant shall not
                    allow any sale by auction upon the Premises, or place any
                    loads upon the floors, walls or ceilings which endanger the
                    structure, or place any harmful liquids in the drainage
                    system of the Building or Project. No waste, materials or
                    refuse shall be dumped upon or permitted to remain outside
                    the Premises except in trash containers placed inside
                    exterior enclosures designated for that purpose by Landlord.
               -----------------------------------------------------------------
               
                                      -6-
<PAGE>
 
               -----------------------------------------------------------------
                    C.  Tenant shall not use the Premises or permit anything to
                    be done in or about the Premises which will in any way
                    conflict with any law, statute, ordinance or governmental
                    rule or regulation now in force or which may hereafter be
                    enacted or promulgated. Tenant shall at its sole cost and
                    expense obtain any and all licenses or permits necessary for
                    Tenant's use of the Premises. Tenant shall promptly comply
                    with the requirements of any board of fire underwriters or
                    other similar body now or hereafter constituted relating to
                    or affecting the condition, use or occupancy of the
                    Premises. The judgment of any court of competent
                    jurisdiction or the admission of Tenant in any actions
                    against Tenant, whether Landlord be a party thereto or not,
                    that Tenant has so violated any such law, statute,
                    ordinance, rule, regulation or requirement, shall be
                    conclusive of such violation as between Landlord and Tenant.
                    Tenant shall not do or permit anything to be done in, on, or
                    about the Premises or bring or keep anything which will in
                    any way increase the rate of any insurance upon the
                    Premises, Building or Project, or upon any contents therein
                    or cause a cancellation of said insurance or otherwise
                    affect said insurance in any manner. Tenant shall indemnify
                    Landlord and hold Landlord harmless against any loss,
                    expense, damage, attorneys' fees or liability arising out of
                    the failure of Tenant to comply with any applicable law or
                    comply with the requirements as set forth herein.

            
  RULES AND    5.   Tenant and Tenant's agents, employees, and invitees shall
REGULATIONS         faithfully observe and comply with any reasonable rules and
                    regulations Landlord may from time to time prescribe in
                    writing for the purpose of maintaining the proper care,
                    cleanliness, safety, traffic flow and general order of the
                    Premises or Project. Landlord shall make reasonable efforts
                    to enforce compliance by any other tenant or occupant of the
                    building or project with any of the rate and regulations.

          RENT 6.   Tenant shall pay to Landlord, without demand throughout the
                    Term, Rent as specified in the Basic Lease Information, 
See Addendum 2      payable in monthly installments in advance on or before the
                    first day of each calendar month, in lawful money of the
                    United States, without deduction or offset whatsoever to
                    Landlord at the address specified in the Basic Lease
                    Information or to such other firm or to such other place as
                    Landlord may from time to time designate in writing. Rent
                    for the first full month of the Term shall be paid by Tenant
                    upon Tenant's execution of this Lease. If the obligation for
                    payment of Rent commences on other than the first day of a
                    month, then Rent shall be prorated and the prorated
                    installment shall be paid on the first day of the calendar
                    month next succeeding the Term Commencement Date.
 
         BASIC 7.   A.  BASIC OPERATING COST.  In addition to the Base Rent 
OPERATING COST      requirement to be paid hereunder, Tenant shall pay as
                    additional Rent, Tenant's Proportionate Share, as defined in
                    the Basic Lease Information of Basic Operating Cost in the
                    manner set forth below. Basic Operating Cost shall mean all
                    expenses and costs of every kind and nature which Landlord
                    shall pay or become obligated to pay, or would be required
                    to pay if the Project were fully occupied, because of or in
                    connection with the management, maintenance, preservation
                    and operation of the Project and its supporting facilities
                    servicing the Project (determined in accordance with
                    generally accepted accounting principles, consistently
                    applied) including but not limited to the following:

                    (1)  All real estate taxes, possessory interest taxes,
                    business or license taxes or fees, service payment in lieu
                    of such taxes or fees, annual or periodic license or use
                    fees, excises, transit charges, housing fund assessments,
                    open space charge, assessments, levies, fees or charges,
                    general and special, ordinary and extraordinary, unforeseen
                    as well as foreseen, of any kind (including fees "in-lieu"
                    of any such tax or assessment) which are assessed, levied,
                    charged, confirmed, or imposed by any public authority upon
                    the Project its operations or the rent (or any portion or
                    component thereof) except (a) inheritance or estate taxes
                    imposed upon or assessed against the project, or any part
                    thereof or interest therein, and (b) taxes computed upon the
                    basis of the net income of Landlord or the owner of any
                    interest therein. See Addendum 3.

                    (2)  All insurance premiums and costs, including but not
                    limited to, any deductible amounts, premiums and cost of
                    fire, casualty and liability coverage, rental abatement and
                    special hazard insurance applicable to the Project and
                    Landlord's personal property used in connection therewith,
                    provided, however, that Landlord may, but shall not be
                    obligated to, carry special hazard insurance covering losses
                    caused by casualty not insured under standard fire and
                    extended coverage insurance. See Addendum 4.

                    (3)  Repairs, replacements and general maintenance for the
                    Premises, Building and Project (except for those repairs
                    expressly the responsibility of Landlord, those repairs paid
                    for by proceeds of insurance or by Tenant or other third
                    parties, and alterations attributable solely to tenants of
                    the Project other than Tenant).
               -----------------------------------------------------------------

                                      -7-
<PAGE>
 
               -----------------------------------------------------------------
                    (4)  All maintenance and service agreements and costs of
                    supplies and equipment used in maintaining the Premises,
                    Building and Project and the equipment therein and the
                    adjacent sidewalks, driveways, parking and service areas,
                    including, without limitation, alarm service, window
                    cleaning, elevator maintenance, Building exterior
                    maintenance and landscaping.

                    (5)  Utilities which benefit all or Tenant's portion of the
                    Premises (utilities are metered separately).

                    (6)  A management and accounting cost recovery equal to ten
                    percent (10%) of Basic Operating Costs .

* See Addendum 5    *
 
                    In the event that the building is not fully occupied during
                    any fiscal year of the Term as determined by Landlord, an
                    adjustment shall be made in computing the Basic Operating
                    Cost for such year so that Basic Operating Cost shall be
                    computed as though the building had been one hundred percent
                    (100%) occupied; provided, however, that in no event shall
                    Landlord be entitled to collect in excess of one hundred
                    percent (100%) of the Total Basic Operating Cost from all of
                    the tenants in the Building including Tenant.
 
                    All costs and expenses shall be determined in accordance
                    with generally accepted accounting principles which shall be
                    consistently applied. Basic Operating Cost shall not include
                    specific costs incurred for the account of, separately
                    billed to and paid by specific tenants. Notwithstanding
                    anything herein to the contrary, any instance wherein
                    Landlord, at Landlord's fair and reasonable discretion,
                    deems Tenant to be responsible for any amounts greater than
                    its Proportionate Share, Landlord shall have the right to
                    allocate costs in any manner Landlord deems appropriate.

                    B.  PAYMENT OF ESTIMATED BASIC OPERATING COST. "Estimated
                    Basic Operating Cost" for any particular year shall mean
                    Landlord's estimate of the Basic Operating Cost for such
                    fiscal year made prior to commencement of such fiscal year
                    as hereinafter provided. Landlord shall have the right from
                    time to time to revise its fiscal year and interim
                    accounting periods so long as the periods as so revised are
                    reconciled with prior periods in accordance with generally
                    accepted accounting principles applied in a consistent
                    manner. During the last month of each fiscal year during the
                    Term, or as soon thereafter as practicable, Landlord shall
                    give Tenant written notice of the Estimated Basic Operating
                    Cost for the ensuing fiscal year. Tenant shall pay Tenant's
                    Proportionate Share of the Estimated Basic Operating Costs
                    with installments of Base Rent for the fiscal year to which
                    the Estimated Basic Operating Cost applies in monthly
                    installments on the first day of each calendar month during
                    such year, in advance. If at any time during the course of
                    the fiscal year, Landlord determines that Basic Operating
                    Cost will apparently vary from the then Estimated Basic
                    Operating Cost by more than ten percent (10%), Landlord may,
                    by written notice to Tenant, revise the Estimated Basic
                    Operating Cost for the balance of such fiscal year and
                    Tenant shall pay Tenant's Proportionate Share of the
                    Estimated Basic Operating Cost as so revised for the balance
                    of the then current fiscal year on the first of each
                    calendar month thereafter.

                    C.  COMPUTATION OF BASIC OPERATING COST ADJUSTMENT. "Basic
                    Operating Cost Adjustment" shall mean the difference between
                    Estimated Basic Operating Cost and Basic Operating Cost for
                    any fiscal year determined as hereinafter provided. Within
                    one hundred twenty (120) days after the end of each fiscal
                    year, as determined by Landlord, or as soon thereafter as
                    practicable, Landlord shall deliver to Tenant a statement of
                    Basic Operating Cost for the fiscal year just ended
                    accompanied by a computation of Basic Operating Cost
                    Adjustment. If such statement shows that Tenant's payment
                    based upon Estimated Basic Operating Cost is less than
                    Tenant's proportionate Share of Basic Operating Cost, then
                    Tenant shall pay to Landlord the difference within twenty
                    (20) days after receipt of such statement. If such statement
                    shows that Tenant's payments of Estimated Basic Operating
                    Cost exceed Tenant's Proportionate Share of Basic Operating
                    costs, then (provided that Tenant is not in default under
                    this Lease), Landlord shall pay to Tenant the difference
                    within twenty (20) days of such statement. If this Lease has
                    been terminated or the Term hereof has expired prior to the
                    date of such statement, then the Basic Operating Cost
                    Adjustment shall be paid by the appropriate party within
                    twenty (20) days after the date of delivery of the fiscal
                    year. Tenant's Proportionate Share of the Basic Operating
                    Cost adjustment shall be prorated by reference to the exact
                    number of calendar days during such fiscal year for which
                    Tenant is obligated to pay Base Rent.
               -----------------------------------------------------------------

                                      -8-
<PAGE>
 
               -----------------------------------------------------------------

                    D.  NET LEASE. This shall be a net Lease and Base Rent shall
                    be paid to Landlord absolutely net of all costs and expenses
                    except as herein provided. The provisions for payment of
                    Basic Operating Cost and the Basic Operating Cost Adjustment
                    are intended to pass on to Tenant and reimburse Landlord for
                    all costs and expenses of the nature described in paragraph
                    7A incurred in connection with ownership and operating of
                    the Building or Project.

                    E.  TENANT AUDIT. Tenant shall have the right, at Tenant's
                    expense and upon not less than five (5) days prior written
                    notice to Landlord, to review at reasonable times, in
                    Landlord's office, Landlord's books and records applicable
                    to Tenant's Lease for purposes of verifying Landlord's
                    calculation of the Basic Operating Cost and Basic Operating
                    Cost Adjustment.

                    In the event that Tenant shall dispute the amount set forth
                    in any statement provided by Landlord under paragraph 7B or
                    7C above, Tenant shall have the right, not later than twenty
                    (20) days following the receipt of such statement and upon
                    condition that Tenant shall first deposit with Landlord the
                    full amount in dispute, to cause Landlord's books and
                    records with respect to such fiscal year to be audited by
                    certified public accountant selected by Tenant and subject
                    to Landlords' reasonable right of approval. The Basic
                    Operating Cost Adjustment shall be appropriately adjusted on
                    the basis of such audit. If such audit disclosed a liability
                    for a refund in excess of ten percent (10%) of Tenant's
                    Proportionate Share of the Basic Operating Cost Adjustment
                    previously reported, the cost of such audit shall be borne
                    by Landlord; otherwise the cost of such audit shall be paid
                    by Tenant. If Tenant shall not request an audit in
                    accordance with the provisions of this paragraph 7E within
                    twenty (20) days of receipt of Landlord's statement provided
                    pursuant to paragraph 7B, 7C, such statement shall be final
                    and binding for all purposes hereof.

INSURANCE AND  8.   A.  CASUALTY INSURANCE.  Landlord agrees to maintain 
   INDEMNIFI-       insurance insuring the Buildings of the Project, of which 
       CATION       the Premises are a part, against fire, lightning, extended 
                    coverage, vandalism and malicious mischief in an amount not
                    less than eighty percent (80%) of the replacement cost
                    thereof. Such insurance shall be for the sole benefit of
                    Landlord and under its sole control, Landlord shall not be
                    obligated to insure any furniture, equipment, machinery,
                    goods or supplies not covered by this Lease which Tenant may
                    keep or maintain in the Premises or any leasehold
                    improvements, additions or alterations which Tenant may make
                    upon the Premises.

                    B.  LIABILITY INSURANCE. Tenant shall purchase at its own
                    expense and keep in force during this Lease a policy or
                    policies of comprehensive liability insurance, including,
                    bodily injury and property damage, in the amount of not less
                    that Five Hundred Thousand Dollars ($500,000.00) for
                    property damage and Two Million Dollars ($2,000,000.00) per
                    occurrence for bodily injuries or deaths of persons
                    occurring in or about the Premises and Project. Said
                    policies shall (1) name landlord and, if applicable, its
                    agents, and any party holding an interest to which this
                    lease may be subordinated as additional insureds, (2) have a
                    Best rating of and licensed to do business in the State of
                    California and (3) provide that said insurance shall not be
                    cancelled, unless thirty (30) days prior written notice
                    shall have been given to landlord. Said policy or policies
                    or certificates thereof shall be delivered to landlord by
                    Tenant upon commencement of the lease and upon each renewal
                    of said insurance.

                    C.  INDEMNIFICATION. Landlord shall not be liable to Tenant
                    for any loss or damage to person or property caused by
                    theft, fire, act of God, acts of a public enemy, riot,
                    strike, insurrection, war, court order, requisition or order
                    of governmental body or authority or for any damage or
                    inconvenience which may arise through repair or alteration
                    of any part of the Building or Project or failure to make
                    any such repair except as expressly otherwise provided in
                    paragraphs 10 and 12. Tenant shall indemnify Landlord and
                    hold Landlord harmless from any and all loss, cost, damage,
                    injury or expense arising out of or related to (1) claims of
                    injury to or death of persons or damage to property
                    occurring or resulting from the negligence of Tenant, its
                    agents, employees, invitees, or authorized representatives,
                    (2) claims for work or labor performed, or for materials or
                    supplies furnished to or at the request of Tenant or in
                    connection with performance of any work done for the account
                    of Tenant within the Premises or Project, and (3) claims
                    arising from any breach or default on the part of Tenant in
                    the performance of any covenant contained in this Lease.
                    Such indemnity shall include without limitation the
                    obligation to provide all costs of defense against any such
                    claims including any action or proceeding brought against
                    Landlord. The provisions of this paragraph shall survive the
                    expiration or termination of this Lease with respect to any
                    claims or liability occurring prior to such expiration or
                    termination. See Addendum 6. See Addendum 8.

  WAIVER OF         9.
SUBROGATION

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                                      -9-
<PAGE>
 
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  LANDLORD'S
 REPAIRS AND
    SERVICES   10.  Landlord shall at Landlord's expense maintain the structural
                    soundness of the roof, foundations and exterior walls of the
                    Building in good repair, reasonable wear and tear and acts
                    of God excepted. The term walls as used herein shall not
                    include windows, glass or plate glass, doors, special store
                    fronts or office entries. The term roof as used herein shall
                    not include skylights, smoke hatches or roof vents. Landlord
                    shall perform on behalf of Tenant and other tenants of the
                    Project the maintenance of the public and common areas of
                    the Project including but not limited to the landscaped
                    areas, parking areas, driveways, the truck staging areas,
                    rail spur areas, fire sprinkler systems, sanitary and storm
                    sewer lines, utility services, electric and telephone
                    equipment servicing the Building(s), exterior lighting, and
                    items which affect the operation and exterior maintenance of
                    the Project, including painting and caulking, which
                    determination shall be at Landlord's reasonable discretion.
                    Tenant shall reimburse Landlord for all such costs in
                    accordance with Paragraph 7. Any damage caused by or repairs
                    necessitated by any act of Tenant may be repaired by
                    Landlord at Landlord's option and at Tenant's expense.
                    Tenant shall immediately give Landlord written notice of any
                    defect or need of repairs after which Landlord shall have
                    reasonable opportunity to repair same. See Addendum 8.

    TENANT'S   11.  Tenant shall at Tenant's expense maintain all parts of the
     REPAIRS        Premises in a good clean and secure condition promptly
                    making all necessary repairs and replacements including but
                    not limited to all windows, glass, doors and any special
                    office entries, walls and wall finishes, floor covering,
                    hearing, ventilating and air conditioning systems, truck
                    doors, dock bumpers, dock plates and levelers, roofing,
                    plumbing work and fixtures, downspouts, skylights, smoke
                    hatches and roof vents. Tenant shall at Tenant's expense
                    also perform necessary pest extermination and regular
                    removal of trash and debris. If required by the railroad
                    company, Tenant agrees to sigh a joint maintenance agreement
                    governing the use of the rail spur, if any. Tenant, shall,
                    at its own expense, enter into a regularly scheduled
                    preventive maintenance/service contract with a maintenance
                    contractor for servicing all hot water, hearing and air
                    conditioning systems and equipment within or serving the
                    Premises. The maintenance contractor and the contract must
                    be approved by Landlord. The service contract must include
                    all services suggested by the equipment manufacturer within
                    the operation/maintenance manual and must become effective
                    and a copy thereof delivered to Landlord within sixty (60)
                    days of the Term Commencement Date. Tenant shall not damage
                    any demising wall or disturb the integrity and support
                    provided by any demising wall and shall, at its sole
                    expense, immediately repair any damage to any demising wall
                    caused by Tenant or its employees, agents or invitees.
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                                     -10-
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ALTERATIONS    12.  Tenant shall not make, or allow to be made, any structural
                    or non-structural alterations which exceed Ten Thousand
                    Dollars ($10,000) in value per alteration, alterations or
                    physical additions in, about or to the premises without
                    obtaining the prior written consent of Landlord which
                    consent shall not be unreasonably withheld with respect to
                    proposed alterations and additions which (a) comply with all
                    applicable laws, ordinances, rules and regulations, (vb) are
                    compatible with the Project and its mechanical, plumbing,
                    electrical, and heating/ventilation/air conditioning
                    systems, and (c) will not interfere with the use and
                    occupancy of any other portion of the Building or Project by
                    any other tenant or its invitees. Specifically but without
                    limiting the generality of the foregoing, Landlord shall
                    have the right of consent for all plans and specifications
                    for the proposed alterations or additions, construction
                    means and methods, any contractor or subcontractor to be
                    employed on the work of alteration or additions, and the
                    time for performance of such work. Tenant shall also supply
See Addendum 9      to Landlord any documents and information reasonably
                    requested by Landlord in connection with its consideration
                    of a request for approval hereunder. Tenant must have
                    Landlord's written approval and all appropriate permits and
                    licenses prior to the commencement of said alterations and
                    additions. All alterations and additions permitted hereunder
                    shall be made and performed by Tenant without cost or
                    expense to Landlord. Landlord shall have the right to
                    require Tenant to remove any or all alterations, additions,
                    improvements and partitions made by Tenant and restore the
                    Premises to their original condition by the termination of
                    this Lease, by lapse of time or otherwise, all at Tenant's
                    expense. All such removals and restoration shall be
                    accomplished in a good workmanlike manner so as not to cause
                    any damage to the Premises or Project whatsoever. If
                    Landlord so elects, such alterations, physical additions or
                    improvements shall become the property of Landlord and
                    surrendered to Landlord upon the termination of this Lease
                    by lapse of time or otherwise; provided, however that this
                    clause shall not apply to trade fixtures or furniture owned
                    by Tenant. In addition to and wholly apart from its
                    obligation to pay Tenant's Proportionate Share of Basic
                    Operating Costs, Tenant shall be responsible for and shall
                    pay prior to delinquency any taxes or governmental service
                    fees, possessory interest taxes, fees or charges in lieu of
                    any such taxes, capital levies, or other charges imposed
                    upon, levied with respect to or assessed against its
                    personal property, on the value of its alterations,
                    additions or improvements and on its interest pursuant to
                    this Lease. To the extent that any such taxes are not
                    separately assessed or billed to Tenant, Tenant shall pay
                    the amount thereof as invoiced to Tenant by Landlord.
 
SIGNS          13.  All signs, notices and graphics of every kind or character,
                    visible in or from public view or corridors, the common
                    areas or the exterior of the Premises, shall be subject to
                    Landlord's prior written approval. Tenant shall not place or
See Addendum 10     maintain any banners whatsoever or any window decor in or on
                    any exterior window or window fronting upon any common areas
                    or service area or upon any truck doors or man doors without
                    Landlord's prior written approval. Any installation of signs
                    or graphics on or about the Premises and Project shall be
                    subject to any applicable governmental laws, ordinances,
                    regulations and to pay any other requirements imposed by
                    Landlord. Tenant shall remove all such signs and graphics by
                    the termination of this Lease. Such installations and
                    removals shall be made in such manner as to avoid injury to
                    or defacement of the Premises, Building or Project and any
                    other improvements contained therein, and Tenant shall
                    repair any injury or defacement including without limitation
                    discoloration caused by such installation or removal.
 
 
INSPECTION/    14.  After reasonable notice, except in emergencies where no such
POSTING             notice shall be required, Landlord, its agents and
NOTICES             representatives, shall have the right to enter the Premises
                    to inspect the same, to clean, to perform such work as may
                    be permitted or required hereunder, to make repairs or
                    alterations to the Premises or Project or to other tenant
                    spaces therein, to deal with emergencies, to post such
                    notices as may be permitted or required by law to prevent
                    the perfection of liens against Landlord's interest in the
                    Project or to exhibit the Premises to prospective tenants,
                    purchasers, encumbrances or others, or for any other purpose
                    as Landlord may deem necessary or desirable; provided,
                    however, that Landlord shall not unreasonably interfere with
                    Tenant's business operations. Tenant shall not be entitled
                    to any abatement of Rent by reason of the exercise of any
                    such right of entry. Six months prior to the end of the
                    lease, Landlord shall have the right to erect on the
                    Premises and/or Project a suitable sign indicating that the
                    Premises are available for lease. Tenant shall give written
                    notice to Landlord at least thirty (30) days prior to
                    vacating the Premises and shall meet with Landlord for a
                    joint inspection of the Premises at the time of vacating. In
                    the event of Tenant's failure to give such notice or
                    participate in such joint inspection, Landlord's inspection
                    at or after Tenant's vacating the Premises shall
                    conclusively be deemed correct for purposes of determining
                    Tenant's responsibility for repairs and restoration. -----
                    ten (10) days prior written notice, except in emergencies
                    where no such approval shall be required. Tenant shall
                    accompany Landlord to any such coincidental areas.

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                                      -11-
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UTILITIES      15.  Tenant shall pay for all water, gas, heat, air conditioning,
                    light, power, telephone, sewer, sprinkler charges and other
                    utilities and services used on or from the Premises,
                    together with any taxes, penalties, surcharges or the like
                    pertaining thereto, and maintenance charges for utilities
                    and shall furnish all electric light bulbs, ballasts and
                    tubes. If any such services are not separately metered to
                    Tenant, Tenant shall pay a reasonable proportion, as
                    determined by Landlord, of all charges jointly serving other
                    premises. Landlord shall not be liable for any damages
                    directly or indirectly resulting from nor shall the Rent or
                    any monies owed Landlord under this Lease herein reserved be
                    abated by reason of (a) the installation, use or
                    interruption of use of any equipment used in connection with
                    the furnishing of any of the foregoing utilities and
                    services, (b) failure to furnish or delay in furnishing any
                    such utilities or services when such failure or delay is
                    caused by acts of God or the elements, labor disturbances of
                    any character, any other accidents or other conditions
                    beyond the reasonable control of Landlord, or (c) the
                    limitation, curtailment, rationing or restriction on use of
                    water, electricity, gas or any other form of energy or any
                    other service or utility whatsoever serving the Premises or
                    Project. LL shall be entitled to cooperate voluntarily and
                    in a reasonable manner with the efforts of national, state
                    or local governmental agencies or utility suppliers in
                    reducing energy or other resource consumption. The
                    obligation to make services available hereunder shall be
                    subject to the limitations of any such voluntary, reasonable
                    program.

SUBORDINATION  16.  Without the necessity of any additional document being
                    executed by Tenant for the purpose of effecting a
                    subordination, this Lease shall be subject and subordinate
                    at all times to (a) (b) any mortgage or deed of trust which
                    may now exist or be placed upon said Project, or Landlord's
                    interest or estate in any of said items, which is specified
                    as security. Notwithstanding the foregoing, Landlord shall
                    have the right to subordinate or cause to be subordinated
                    any such ground leases or underlying leases or any such
                    liens to this Lease In the event that any mortgage or deed
                    of trust is foreclosed or a conveyance in lieu of
                    foreclosure is made of any reason, Tenant shall,
                    notwithstanding any subordination, attorn to and become the
                    Tenant of the successor in interest to Landlord at the
                    option of such successor in interest, so long as Tenant's
                    rights are recognized by such successor in interest. Tenant
                    shall execute and deliver, upon demand by Landlord and in
                    the form requested by Landlord, any additional documents
                    evidencing the priority of subordination of this Lease with
                    respect to any such ground leases or underlying leases or
                    any such mortgage or deed of trust.


FINANCIAL      17.  At the request of Landlord, Tenant shall provide to Landlord
STATEMENTS          its current financial statement or other information
                    discussing financial worth which Landlord shall use solely
                    for purposes of this Lease and in connection with the
                    ownership, management and disposition of the property
                    subject hereto. If Tenant is a corporation whose stock is
                    publicly-traded, current publicly.
 
ESTOPPEL       18.  Tenant agrees from time to time with fifteen (15) days after
CERTIFICATE         request of landlord, to deliver to Landlord, or Landlord's
                    designee, an estoppel certificate stating that this lease is
                    in full force and effect, the date to which Rent has been
                    paid, the unexpired portion of this lease and such other
                    matters pertaining to this Lease as may be reasonably
                    requested by Landlord. Failure by Tenant to execute and
                    deliver such certificate shall constitute an acceptance of
                    the Premises and acknowledgment by Tenant that the
                    statements included are true and correct without exception.
                    Landlord and Tenant intend that any statement delivered
                    pursuant to this paragraph may be relied upon by any
                    mortgagee, beneficiary, purchaser or prospective purchaser
                    of the Project or any interest therein. The parties agree
                    that Tenant's obligation to furnish such estoppel
                    certificates in a timely fashion is a material inducement
                    for Landlord's execution of the Lease.
 
SECURITY       19.
DEPOSIT

TENANT'S       20.  Tenant shall look solely to Landlord' interest in the
REMEDIES            Project or to the proceeds of Landlord's liability insurance
                    for recovery of any judgment from Landlord. Landlord, or if
                    Landlord is a partnership, its partner whether general or
                    limited, or if it is a corporation, its directors, officers
                    or shareholders, shall never be personally liable for any
                    such judgment. Any lien obtained to enforce any such
                    judgment and any levy of execution thereon shall be subject
                    and subordinate to any lien, mortgage or deed of trust on
                    the Project. Landlord shall maintain Five Million Dollars
                    ($5,000,000) of general liability insurance with an
                    insurance carrier with a Best rating of 10 or better.
                    Landlord shall provide Tenant with proof of such insurance.
 
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                                      -12-
<PAGE>
 
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ASSIGNMENT     21.  A.  Tenant shall not assign or sublet the Premises or any
AND                 part thereof without Landlord's prior written approval
SUBLETTING          except as provided herein. If Tenant desires to assign this
                    Lease or sublet any or all of the Premises. Tenant shall
                    give Landlord written notice thirty (30) days prior to the
                    anticipated effective date of the assignment or sublease.
                    Landlord shall then have a period of fifteen (15) days
                    following receipt of such notice to notify Tenant in writing
                    that Landlord elects either (1) to terminate this Lease , or
                    (2) to permit Tenant to assign this Lease or sublet such
                    space, subject, however, to Landlord's prior written
                    approval of the proposed assignee of subtenant and of any
                    related documents or agreements associated with the
                    assignment of sublease, such consent not to be unreasonably
                    withheld so long as the use of the Premises by such proposed
                    assignee or subtenant would be a Permitted use and would not
                    increase Occupant Density of the Project, the proposed
                    assignee or subtenant is of sound financial condition. If
                    Landlord should fail to notify Tenant in writing of such
                    election within said period, Landlord shall be deemed to
                    have waived option (1) above, but written approval by
                    Landlord of the proposed assignee or subtenant shall be
                    required. Failure by Landlord to approve a proposed assignee
                    or subtenant shall not cause a termination of this Lease.
 
                    B.  Any Rent or other consideration realized by Tenant under
                    any such sublease or assignment in excess of Rent payable
                    hereunder, after amortization (1) the reasonable cost of any
                    improvements which Tenant has made for the purpose of
                    assigning or subletting all or part of the Premises and (2)
                    reasonable subletting and assignment costs, shall be divided
                    and paid, fifty percent (50%) to Tenant and fifty percent
                    (50%) to Landlord.

                    C.  In any subletting or assignment undertaken by Tenant,
                    Tenant shall diligently seek to obtain the maximum rental
                    amount available in the marketplace to such subletting or
                    assignment.

                    D.

                    E.

                    F.  No assignment or subletting by Tenant shall relieve
                    Tenant of any obligation under this Lease. Any assignment or
                    subletting which conflicts with the provisions hereof shall
                    be void.

QUIET          22.  Landlord represents that it has full right and authority to
ENJOYMENT           enter into this Lease and that Tenant, upon paying the Rent
                    and performing its other covenants and agreements herein set
                    forth, shall peaceably and quietly have, hold and enjoy the
                    Premises for the Term hereof without hindrance or
                    molestation from Landlord, subject to the terms and
                    provisions of this Lease.
 

CONDEMNATION   23.  A. If the whole or any substantial portion of the Project of
                    which the Premises are a part should be taken or condemned
                    for any public use or under governmental law ordinance or
                    regulation, or by right of eminent domain, or by private
                    purchase in lieu thereof, and the taking would prevent or
                    materially interfere with the Permitted Use of the Premises,
                    this lease shall terminate and the Rent shall be abated
                    during the unexpired portion of this Lease, effective when
                    the physical taking of said Premises shall have occurred.

                    B.  If a portion of the Project of which the Premises are
                    part should be taken or condemned for any public use under
                    any governmental law, ordinance, or regulation,, or by right
                    of eminent domain, or by private purchase in lieu thereof,
                    and this Lease is not terminate as provided in the
                    subparagraph 23A above, this Lease shall not terminate, but
                    the Rent payable hereunder during the unexpired portion of
                    the Lease shall be reduced.

                    C.  Landlord shall be entitled to any and all payment,
                    income, rent, award, or any interest therein whatsoever
                    which may be paid or made in connection with such taking or
                    conveyance and Tenant shall have no claim against Landlord
                    or otherwise for the value of any unexpired portion of this
                    Lease. Notwithstanding the foregoing paragraph, any
                    compensation specifically awarded Tenant for loss of
                    business, Tenant's personal property, moving cost or loss of
                    goodwill, shall be and remain the property of Tenant.

CASUALTY       24.  A. If the Premises should be damaged or destroyed by fire,
DAMAGE              tornado or other casualty, Tenant shall give immediate
                    written notice thereof to Landlord. Within thirty (30) days
                    of such notice, Landlord shall notify Tenant whether in
                    Landlord's opinion such repairs can be made either (1)
                    within (90) days (2) i more than ninety (90) days but in
                    less than one hundred fifty (150) days, or (3) in more than
                    one hundred fifty days (150) from the date of such notice;
                    Landlord's determination shall be binding on Tenant.
 
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                    B.  If the Premises should be damaged by fire, tornado or
                    other casualty but only to such extent that rebuilding or
                    repairs can in Landlord's estimation be completed within
                    ninety (90) days after the date upon which Landlord is
                    notified by Tenant of such damage, this Lease shall not
                    terminate, and Landlord shall at its sole cost and expense
                    thereupon proceed with reasonable diligence to rebuild and
                    repair the Premises to substantially the condition in which
                    they existed prior to such damage, except that Landlord
                    shall not be required to rebuild, repair or replace any part
                    of the partitions, fixtures, additions and other
                    improvements which may have been placed in, on or about the
                    Premises by Tenant. If the Premises are untenantable in
                    whole or in part following such damage, the Rent payable
                    hereunder during the period in which they are untenantable
                    shall be reduced.

                    C.  If the Premises should be damaged by fire, tornado or
                    other casualty but only to such extent that rebuilding or
                    repairs can in Landlord's estimation be completed in more
                    than ninety (90) days but in less than one hundred fifty
                    (150) days, then Landlord shall have the option of either
                    (1) terminating the Lease effective upon the date of the
                    occurrence of such damage, in which event the Rent shall be
                    abated during the unexpired portion of the Lease, or (2)
                    electing to rebuild or repair the Premises to substantially
                    the condition in which they existed prior to such damage
                    except that Landlord shall not b required to rebuild, repair
                    or replace any part of the partitions, fixtures, additions
                    and other improvements which may have been placed in, or
                    about the Premises by Tenant. If the Premises are
                    untenantable in whole or in part following such damage, the
                    Rent payable hereunder during the period in which they are
                    untenantable shall be reduced in direct proportion to the
                    area of the Premises reasonably determined to be unusable.
                    In the event that Landlord should fail to complete such
                    repairs and rebuilding within one hundred fifty (150) days
                    after the date upon which Landlord is notified by Tenant of
                    such damage, such period of time to be extended for delays
                    caused by the fault or neglect of Tenant or because of acts
                    of God, acts as of public agencies, labor disputes, strikes,
                    fires, freight embargoes, rainy or stormy weather, inability
                    to obtain materials, supplies or fuels, or delay of the
                    contractors or subcontractors due to such causes or other
                    contingencies beyond the reasonable control of Landlord,
                    Tenant may at its option terminate this Lease by delivering
                    thirty (30) days prior written notice of termination to
                    Landlord as Tenants exclusive remedy, whereupon all rights
                    and obligations hereunder shall cease and terminate.

                    D.  If the Premises should be so damaged by fire, tornado,
                    or other casualty that rebuilding or repairs cannot in
                    Landlord's estimation be completed within one hundred fifty
                    (150) days after the date upon which Landlord is notified by
                    Tenant of such damage, this Lease shall terminate and the
                    Rent shall be abated during the unexpired portion of this
                    Lease, effective upon the date of the occurrence of such
                    damage.

                    E.  Notwithstanding anything herein to the contrary, in the
                    event that holder of any indebtedness secured by a mortgage
                    or deed of trust covering the Premises requires that the
                    insurance proceeds be applied to such indebtedness, then
                    Landlord shall have the right to terminate this Lease by
                    delivering written notice of termination to Tenant within
                    fifteen (15) days after such requirement is made by any such
                    holder, whereupon all rights and obligations hereunder shall
                    cease and terminate.

HOLDING OVER   25.  Tenant shall also indemnify and hold Landlord harmless from
                    any loss or liability resulting from delay by Tenant shall
See Addendum 12     also indemnify and hold Landlord harmless from any loss or
                    liability resulting from delay by Tenant in surrendering the
                    Premises, including, without limitation, any claims made by
                    any succeeding tenant founded on such delay. Alternatively,
                    if Landlord gives notice of Landlord's consent to Tenant's
                    holding over, such holding over shall constitute renewal of
                    the Lease on whatever terms constitute a renewal of this
                    Lease, and nothing contained in this paragraph shall waive
                    Landlord's right of Tenant at sufferance whether or not
                    Landlord accepts any Rent from Tenant while Tenant is
                    holding over without Landlord's written consent.
                    Additionally, in the event that upon termination of the
                    Lease, Tenant has not fulfilled its obligation with respect
                    to repairs and cleanup of the Premises or any other Tenant
                    obligations as set forth in this Lease, then Landlord shall
                    have the right to perform any such obligations as it deems
                    necessary at Tenant's sole cost and expense, and any time
                    required by Landlord to complete such obligations shall be
                    considered a period of holding over and the terms of this
                    paragraph shall apply.
 
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DEFAULT        26.  A. EVENTS OF DEFAULT: The occurrence of any of the following
                    shall constitute an event of default on the part of Tenant:
 
                    (1)  ABANDONMENT. Vacation or abandonment of the Premises
                    without prior written notice to Landlord for a continuous
                    period in excess of five (5) days. Tenant waives any right
                    to notice Tenant may have under Section 1951.3 of the Civil
                    Code of the State of California, the terms of this
                    subparagraph 26A being deemed such notice to Tenant as
                    required by said Section 1951.3.

                    (2)  NONPAYMENT OF RENT. Failure to pay any installment of
                    Rent or any other amount due and payable hereunder upon the
                    date when said payment is due, such failure continuing
                    without cure by payment of the delinquent Rent and late
                    charge or other obligations for a period of ten (10) days
                    after written notice and demand; provided, however, that
                    except as expressly otherwise provided herein, Landlord
                    shall not be required to provide such notice more than twice
                    during the Term, the third such non-payment constituting
                    default for all purposes hereof without requirements of
                    notice.

                    (3)  OTHER OBLIGATIONS. Failure to perform any obligations,
                    agreement or covenant under this Lease other than those
                    matters specified in subparagraphs (1) and (2) of this
                    subparagraph 26A, such failure continuing for fifteen (15)
                    days after written notice of such failure or such longer
                    period as Landlord determines to be necessary to remedy such
                    default, provided that Tenant shall continuously and
                    diligently pursue such remedy at all times until such
                    default is cured.

                    (4)  GENERAL ASSIGNMENT. A general assignment by Tenant for
                    the Benefit of creditors.

                    (5)  BANKRUPTCY.  The filing of any voluntary petition in
                    bankruptcy by Tenant, or the filing of an involuntary
                    petition by Tenant's creditors, which involuntary petition
                    remains undischarged for a period of thirty (30) days. In
                    the event that under applicable law the trustee in
                    bankruptcy or Tenant has the right to affirm this Lease and
                    continue to perform the obligation of Tenant hereunder, such
                    trustee or Tenant shall, in such time period as may be
                    permitted by the bankruptcy court having jurisdiction, cure
                    all defaults of Tenant hereunder outstanding as of the date
                    of the affirmance of this Lease and provide to Landlord such
                    adequate assurances as may be necessary to ensure Landlord
                    of the continued performance of Tenant's obligations under
                    this Lease.

                    (6)  RECEIVERSHIP.  The employment of a receiver to take
                    possession of substantially all Tenant's assets or the
                    premises, if such attachment or other seizure remains
                    undismissed or undischarged for a period of thirty (30) days
                    after the levy thereof.

                    (7)  ATTACHMENT.  The attachment, execution or other
                    judicial seizure of all or substantially all of Tenant's
                    assets of the Premises, if such attachment or other seizure
                    remains undismissed or undischarged for a period of thirty
                    (30) days after the levy thereof.

                    B.  REMEDIES UPON DEFAULT.
 
                    (1) RENT. All failures to pay any monetary obligation to be
                    paid by Tenant under this Lease shall be construed as
                    obligations for payment of Rent.

                    (2) TERMINATION. In the event of the occurrence of any event
                    of default, Landlord shall have the right, with fifteen (15)
                    days written notice, to immediately terminate this Lease,
                    and at anytime thereafter recover possession of the Premises
                    or any part thereof and expel and remove therefrom Tenant
                    and any other person occupying the same, by any lawful
                    means, and again repossess and enjoy the Premises without
                    prejudice to any of the remedies that Landlord may have
                    under this Lease, or at law or equity by reason of Tenant's
                    default or of such termination.

                    (3) CONTINUATION AFTER DEFAULT. Even though Tenant has
                    breached this Lease and/or abandoned the Premises, this
                    Lease shall continue in effect for so long as Landlord may
                    enforce all its rights and remedies under this Lease,
                    including but without limitation, the right to recover Rent
                    as it becomes due, and Landlord, without terminating this
                    Lease, may exercise all of the rights and remedies of a
                    Landlord under Section 1951.4 of the Civil Code of the State
                    of California or any successor code section. Acts of
                    maintenance preservation or efforts to lease the Premises or
                    the appointment of a receiver upon application of Landlord
                    to protect Landlord's interest under this Lease shall not
                    constitute an election to terminate Tenant's right to
                    possession.

               -----------------------------------------------------------------

                                      -15-
<PAGE>
 
               -----------------------------------------------------------------
                    C.  DAMAGES UPON TERMINATION. Should Landlord terminate this
                    Lease pursuant to the provisions of paragraph 26B(2) hereof,
                    Landlord shall have all the rights and remedies of a
                    Landlord provided by Section 1951.2 of the Civil Code of the
                    State of California, or successor code sections. Upon such
                    termination, in addition to any other rights and remedies to
                    which Landlord may be entitled under applicable law,
                    Landlord shall be entitled to recover from Tenant: (1) the
                    worth at the time of award of the unpaid Rent and other
                    amounts which had been earned at the time of termination (2)
                    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 Rent loss
                    that the Tenant proves could have been reasonably avoided,
                    (3) the wroth at the time of award of the amount by which
                    the unpaid Rent for the balance of the Term after the time
                    of award exceeds the amount of such Rent loss that the
                    Tenant proves could be reasonably avoided, and (4) any other
                    amount necessary to compensate Landlord for all the
                    detriment proximately caused by Tenant's failure to perform
                    its obligations under this Lease or which, in the ordinary
                    course of things, would be likely to result therefrom. The
                    "worth at the time of award" of the amounts referred to in
                    (1) and (2), above shall be computed with interest at the
                    maximum rate allowed by law. The "worth at the time of
                    award" of the amount referred to in (3) above shall be
                    computed by discounting such amount at the Federal Discount
                    Rate of the Federal Reserve Bank of San Francisco at the
                    time of the award plus one percent (1%).

                    D. LATE CHARGE. In addition to its other remedies, Landlord
                    shall have the right with three (3) business days to add to
                    the amount of any payment required to be made by Tenant
                    hereunder, and which is not paid on or before the date the
                    same is due, an amount equal to five percent (5%) of the
                    delinquency for each month or portion thereof that the
                    delinquency remains outstanding to compensate Landlord for
                    the loss of the use of the amount not paid and the
                    administrative costs caused by the delinquency, the parties
                    agreeing that Landlord's damage by virtue of such
                    delinquencies would be difficult to compute and the amount
                    stated herein represents a reasonable estimate thereof.

                    E. REMEDIES CUMULATIVE. All rights privileges and elections
                    or remedies of the parties are cumulative and not
                    alternative to the extent permitted by law and except as
                    otherwise provided herein.

LIENS          27.  Tenant shall keep the Premises free from liens arising out
                    of or related to work performed, materials or supplies
                    furnished or obligations incurred by Tenant or in connection
                    with work made, suffered or done by Tenant in or on the
                    Premises or Project. In the event that Tenant shall not,
                    within ten (10) days following the imposition of any such
                    lien, cause the same to be released of record by payment or
                    posting of a proper bond, Landlord shall have, in addition
                    to all other remedies provided herein and by law, the right,
                    but not the obligation, to cause the same to be released by
                    such means as it shall deem proper, including payment of the
                    claim giving rise to such lien. All sums paid by Landlord on
                    behalf of Tenant and all expenses incurred by Landlord in
                    connection therefore shall be payable to Landlord on behalf
                    of Tenant and all expenses incurred by Landlord in
                    connection therefore shall be payable to Landlord by Tenant
                    on demand with interest at the maximum rate allowable by
                    law. Landlord shall have the right at all times to post and
                    keep posted on the Premises any notices permitted or
                    required by law, or which Landlord shall deem proper for the
                    protection of Landlord, the Premises, the Project and any
                    other party having an interest herein, from mechanics' and
                    materialmen's liens, and Tenant shall give Landlord not less
                    than ten (10) business days prior written notice of the
                    commencement of any work in the Premises or Project of a
                    value of Five Thousand (5,000) which could lawfully give
                    rise to a claim for mechanics' or materialmen's lien.

SUBSTITUTION   28.

TRANSFERS BY   29.  In the event of a sale or conveyance by Landlord of the
 LANDLORD           Building, the same shall operate to release Landlord from
                    any future liability upon any of the covenants or
                    conditions, express or implied, herein contained in favor of
                    Tenant, and in such event Tenant agrees to look solely to
                    the responsibility of the successor in interests of Landlord
                    in and to this Lease. This Lease shall not be affected by
                    any such sale and Tenant agrees to attorn to the purchaser
                    or assignee, so long as Tenant's rights are recognized by
                    the successor interest.
               -----------------------------------------------------------------
 

                                      -16-
<PAGE>
 
               -----------------------------------------------------------------
RIGHT OF       30.  All covenants and agreements to be performed by Tenant under
LANDLORD TO         any of the terms of this Lease shall be performed by Tenant
PERFORM             at Tenant's sole cost and expense and without any abatement
TENANT'S            of Rent. If Tenant shall fail to pay any sum of money, other
COVENANTS           than Rent, required to be paid by it hereunder or shall fail
                    to perform any other act on its part to be performed
                    hereunder, and such failure shall continue for five (5) days
                    after notice thereof by Landlord, Landlord may, but shall
                    not be obligated to do so and without waiving or releasing
                    Tenant fro many obligations of the Tenant, make any such
                    payment or perform any such act on the Tenant's part to be
                    made or performed. All sums so paid by Landlord and all
                    necessary incidental costs together with interest thereon at
                    the maximum rate permitted by law from the date of such
                    payment by the Landlord shall be payable to Landlord on
                    demand, and Tenant covenants to pay such sums and Landlord
                    shall have, in addition to any other right or remedy of
                    Landlord, the same right and remedies in the event of the
                    nonpayment thereof by Tenant as in the case of default by
                    Tenant in the payment of the Rent.

WAIVER         31.  If either Landlord or Tenant waives the performance of any
                    term, covenant or condition contained in this Lease, such
                    waiver shall not be deemed to be a waiver of any subsequent
                    breach of the same or any other waiver of any preceding
                    breach by Tenant of any term, covenant or condition of this
                    Lease, regardless of Landlord's knowledge of such preceding
                    breach at the time Landlord accepted such Rent. Failure by
                    Landlord to enforce any of the terms, covenants or
                    conditions of this Lease for any length of time shall not be
                    deemed to waive or to decrease the right of Landlord to
                    insist thereafter upon strict performance by Tenant. Waiver
                    by Landlord of any term, covenant or condition contained in
                    this Lease may only be made by a written document signed by
                    Landlord.

NOTICES        32.  Each provision of this Lease or of any applicable
                    governmental laws, ordinances, regulations and other
                    requirements with reference to the sending, mailing or
                    delivery of any notice or the making of any payment by
                    Landlord or Tenant to the other shall be deemed to be
                    complied with when and if the following steps are taken:

                    A.  All Rent and other payments required to be made by
                    Tenant to Landlord hereunder shall be payable to Landlord at
                    the address set forth in the Basic Lease Information, or at
                    such other address as Landlord may specify from time to time
                    by written notice delivered in accordance herewith. Tenant's
                    obligation to pay Rent and any other accounts to Landlord
                    under the terms of this Lease shall not be deemed satisfied
                    until such Rent and other amounts have been actually
                    received by Landlord.

                    B.  All notices, demands, consents and approvals which may
                    or are required to be given by either party to the other
                    hereunder shall be in writing and shall be deemed to have
                    been fully given when deposited in the United States mail,
                    certified or registered, postage prepaid, and addressed to
                    the party to be notified at the address for such party
                    specified in the Basic Lease Information or to such other
                    place as the party to be notified may from time to time
                    designate by at least fifteen (15) days notice to the
                    notifying party. Tenant appoints as its agent to receive the
                    service of all default notices and notice of commencement of
                    unlawful detainer proceedings the person in charge of or
                    apparently n charge of or occupying the Premises at the
                    time, and, if there is no such person, then such service may
                    be made by attaching the same on the main entrance of the
                    Premises.

ATTORNEYS'     33.  In the event either party places the environment of this
FEES                Lease, or any part thereof, or the collection of any Rent
                    due, or to become due hereunder, or recovery of the
                    possession of the Premises in the hands of an attorney or
                    files suit upon the same, the prevailing party shall recover
                    its reasonable attorneys' fees and court costs.
 
SUCCESSORS     34.  This Lease shall be binding upon and inure to the benefit of
AND ASSIGNS         Landlord, its successors and assigns, and shall be binding
                    upon and inure to the benefit of Tenant, its successors, and
                    to the extent assignment may be approved by Landlord
                    hereunder, Tenant's assigns.
 
FORCE          35.  Whenever a period of time is herein prescribed for action to
MAJEURE             be taken by Landlord or Tenant, Landlord or Tenant shall not
                    be liable or responsible for, and there shall be excluded
                    from the computation for any such period of time, any delays
                    due to strikes, riots, acts of God, shortages of labor or
                    materials, war, governmental laws, regulations or
                    restrictions or any other causes of any kind whatsoever
                    which are beyond the control of Landlord or Tenant.
 
MISCELLANEOUS  36.  A. The terms "Tenant" or "Landlord" or any pronoun used in
                    place thereof shall indicate and include the masculine or
                    feminine, the singular or plural number, individuals, firms
                    or corporations, and their and each of their respective
                    successors, executors, administrators and permitted assigns,
                    according to the context hereof.
               -----------------------------------------------------------------

                                      -17-
<PAGE>
 
               -----------------------------------------------------------------
                    B.  Time is of the essence regarding the Lease and all of
                    its provisions.

                    C.  This Lease shall in all respects be governed by the laws
                    of the State of California.

                    D.  This Lease, together with its exhibits, contains all the
                    agreements of the parties hereto and supersedes any previous
                    negotiations.

                    E.  There have been no representations made by the Landlord
                    or Tenant or understandings made between the parties other
                    than those set forth in this Lease and it s exhibits.

                    F.  This Lease may not be modified except by a written
                    instrument by the parties hereto.

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

ADDITIONAL     Additional Paragraphs 37 through 40 and Addenda 1 through 12.
PROVISIONS 
 
 

 
               IN WITNESS WHEREOF, the parties hereto have executed this Lease
               this day and year first above written.
 
                    "LANDLORD"
 
                    Spieker-French #130, Limited Partnership, A Texas
                    ------------------------------------------------------------
                    Limited Partnership
 
                    By:_________________________________________________________
 
                    Its:________________________________________________________
 
 
                    "TENANT"
 
                    Tandem Computers Incorporated, A Delaware Corporation
                    ------------------------------------------------------------
 
                    By:_________________________________________________________
 
                    Its:________________________________________________________
               -----------------------------------------------------------------

                                      -18-
<PAGE>
 
ADDITIONAL PARAGRAPHS ATTACHED TO AND MADE A PART OF THAT CERTAIN LEASE DATED
JANUARY 26, 1988, BY AND BETWEEN SPIEKER-FRENCH #130, LIMITED PARTNERSHIP, A
TEXAS LIMITED PARTNERSHIP, AS LANDLORD, AND TANDEM COMPUTERS, INC., A DELAWARE
CORPORATION, AS TENANT, AND TAKES PRECEDENCE SHOULD THERE BE A CONFLICT WITH THE
LEASE.

Paragraph 37.  Option to Re-Lease Premises.  Provided Tenant is not, and has not
------------------------------------------                                      
been, in default of its obligations under this Lease, Tenant shall have an
option to re-lease the Premises in "as-is" condition for a term of five (5)
years at ninety-five percent (95%) of the then current market rent (for
comparable one-story office space in the Vallco Park, Cupertino area).  In no
event will the monthly rental be less than the rental for the last month of the
previous term.

Tenant shall give Landlord written notice of its intent to exercise its option
at least one hundred eighty (180) days prior to the expiration of the current
lease term.  Within fifteen (15) days after Tenant exercises its option to re-
lease, Landlord will provide Tenant with the current market rental, as
determined by Landlord for  the extended term.  Tenant shall have a forty-five
(45) days from notification by Landlord of option rent to accept Landlord's
current market rent.

The parties are obligated to negotiate in good faith to agree on the market
rental for the five (5) year rental adjustment.  If the parties have not
mutually agreed on the market rental adjustment for the five (5) year period
provided herein within forty-five (45) days from notification by Landlord to
Tenant of Landlord's rental determination, each party hereon shall appoint one
representative who shall be a licensed real estate broker experienced in the
leasing of the office space in the County of Santa Clara to act as an
arbitrator. The two (2) arbitrators so appointed shall determine the current
rental value for the subsequent five (5) years for the use to which Tenant is
then utilizing the leased Premises pursuant to which Tenant is then utilizing
the leased Premises pursuant to the terms and conditions of this Lease.  The
determination of said current rental value shall be made by said two (2)
arbitrators within ninety (90) days from notification by Landlord to Tenant of
Landlord's rental determination and they shall submit said determination in
writing and signed by said arbitrators in duplicate.  One of the written
notifications shall be delivered to Landlord and the other to Tenant.

In the event the two (2) arbitrators of the parties hereto cannot agree on the
current rental value for the premises herein, said two (2) arbitrators shall
appoint a third arbitrator who shall be a licensed real estate broker
experienced in the leasing of office space in the County of Santa Clara to act
as an arbitrator.  The current rental value for the subsequent (5) year period
shall be independently determined by the third of said arbitrators, which said
determination shall be made within one hundred twenty (120) days from
notification by Landlord to Tenant of Landlord's rental determination.  The role
of the third arbitrator shall then be immediately select from the proposed
resolution of arbitrators #1 and #2 the one that most closely approximates the
third arbitrator's determination of market rental value.  The third arbitrator
shall have no right to adopt a compromise or middle ground or any modification
of either of the two final proposed resolutions.  The resolution the third
arbitrator chooses as most closely approximating his determination of the
questions in issue shall constitute the decision and award of the arbitrators
and be final and binding upon the parties.

The parties hereto shall pay the charges of the arbitrator appointed by him and
any expenses incurred by such arbitrator.  The charges and expenses of the
third arbitrator, as provided herein, shall be paid by the parties herein in
equal shares.

In the event either arbitrator #1 or arbitrator #2 fails to present a market
ental figure within the thirty (30) day period, the rental presented by the
other arbitrator shall be considered final and binding on both parties.

In the event the third arbitrator fails to present a current market rent within
the thirty (30) day period, then by mutual consent of Landlord and Tenant:

     (a) The time period shall be extended, or

     (b) If Landlord or Tenant do not wish to extend the period, a fourth
arbitrator shall be selected by arbitrator #1 and arbitrator #2 and a new thirty
(30) day period shall begin.

Notwithstanding anything to the contrary herein contained, Tenant's right to
extend the term by exercise of the foregoing option shall be conditioned upon
one of the following:  (i) at the time of exercise of the option, and at the
time of the commencement of the extended term, Tenant shall be in possession of
and occupying the Premises for the conduct of its business therein and the same
shall not be occupied by any assignee, subtenant or licensee, the option to
extend being applicable hereunder only with respect to so 

                    ADDITIONAL PARAGRAPHS TO LEASE - Page 1
<PAGE>
 
much of the Premises as is actually occupied by Tenant; or (ii) if Tenant has
sublet or assigned any portion of the Premises under the provisions of Paragraph
21 above prior to Tenant's written notice of its intent to exercise its option,
Tenant may exercise the foregoing option at one hundred percent (100%) rather
than ninety-five percent (95%) of the then current market rent. In no event will
the monthly rental be less than the rental for the last month of the previous
term.

Paragraph 38.  Satellite Dish.  Tenant shall have the right to install, at
-----------------------------                                             
Tenant's sole expense, a satellite antenna dish on the Premises, provided that
Tenant first obtains prior written approval of the satellite dish size and
location from Landlord.  Tenant agrees to abide by all applicable government
rules, laws, and regulations governing the installation, use and operation of
said antenna.  Tenant shall have the right to remove said satellite dish
provided that Tenant restores the Premises to their original condition prior to
the expiration or termination of this Lease.

Paragraph 39.  Tenant Parking.  Tenant shall have the non-exclusive use of on-
-----------------------------                                                
site parking at a ratio of not more than four (4) cars per 1000 square feet of
rentable area.

Paragraph 40.  Contingency.  This Lease Agreement is contingent upon: 1) the
--------------------------                                                   
final execution of the Lease Termination Agreement dated March 16, 1988 between
Sysorex International, Inc., a Delaware Corporation and Spieker-French #130,
Limited Partnership, a Texas Limited Partnership for the Premises at 10590
Tantau Avenue and 2) the vacation of the Premises by Sysorex International, Inc.
provided that the aforementioned termination agreement between Spieker-French
#130 and Sysorex International, Inc. is fully executed and in full effect.  This
Lease Agreement shall commence upon the day immediately following the vacation
of the Premises by Sysorex International, Inc.

                    ADDITIONAL PARAGRAPHS TO LEASE - Page 2
<PAGE>
 
ADDENDA ATTACHED TO AND MADE A PART OF THAT CERTAIN LEASE DATED JANUARY 26,
1988, BY AND BETWEEN SPIEKER-FRENCH #130, LIMITED PARTNERSHIP, A TEXAS LIMITED
PARTNERSHIP, AS LANDLORD, AND TANDEM COMPUTERS INCORPORATED, A DELAWARE
CORPORATION, AS TENANT, AND TAKES PRECEDENCE SHOULD THERE BE A CONFLICT WITH THE
LEASE.


Addendum No. 1.  Paragraph 2.A.  Possession and Lease Commencement
------------------------------------------------------------------

     The scheduled term commencement date of this Lease is April 1, 1988 and the
scheduled termination date is March 31, 1993.  Notwithstanding said commencement
date, if for any reason Landlord cannot deliver possession of the Premises to
Tenant on said date, Landlord shall not be subject to any liability therefore,
nor shall such failure affect the validity of this Lease or the obligations of
Tenant hereunder, but in such case Tenant shall not be obligated to pay rent
until possession of the Premises is tendered to Tenant; provided, however, that
if Landlord shall not have delivered possession of the Premises within one
hundred twenty (120) days from the said scheduled term commencement date, Tenant
may, at Tenant's option, by notice in writing to Landlord within thirty (30)
days thereafter, cancel this Lease, in which event the parties shall be
discharged from all obligations hereunder and neither party shall have any
further obligations to each other under this Lease Agreement.

     If Tenant occupies the Premises prior to said scheduled term commencement
date, said occupancy shall be subject to all provisions hereof, such occupancy
shall not advance the scheduled term termination date, and Tenant shall pay rent
for such period at the initial monthly rates set forth under the Basic Lease
Information.

     Possession of the Premises shall take place upon the day immediately
following the vacation of the Premises by Sysorex, Inc.  The Premises shall be
delivered to Tenant in "as-is" physical condition.  Tenant further acknowledges
that no representations as to the condition or repair of the Premises nor
promises to alter, remodel or improve the Premises have been made by Landlord,
unless such are expressly set forth in this Lease.  Tenant shall, upon demand,
execute and deliver to Landlord a letter of acceptance of delivery of the
Premises.

Addendum No. 2.  Paragraph 6.  Rent.
----------------------------------- 

     Rent for the Premises shall be as follows:

     Months  1- 30:      $52,673.00 per month plus Basic Operating Costs per
                         Paragraph 7 of the Lease Agreement.

     Months 31-60:       $55,554.00 per month plus Basic Operating Costs per
                         Paragraph 7 of the Lease Agreement.

Addendum No. 3.  Paragraph 7.A.(1).  Basic Operating Costs.
---------------------------------------------------------- 

     Notwithstanding anything to the contrary contained herein, Tenant shall
not, during the first thirty (30) months of the original Lease Term only, be
liable for increases in real property taxes that result from a sale of the
Project by Landlord.  This cap on real property taxes shall be applicable only
to this thirty (30) month period and shall not be applicable in the event of a
sale of the Project to Tandem Computers, Inc. during this period.

Addendum No. 4.  Paragraph 7.A.(2).  Basic Operating Costs.
---------------------------------------------------------- 

     Operating Costs shall not include expenses incurred for business
interruption or rental value insurance.

Addendum No. 5.  Paragraph 7.A.  Basic Operating Costs.
------------------------------------------------------ 

     Limitation on Basic Operating Cost.  Notwithstanding anything to the
contrary contained above, Basic Operating Costs shall not include any of the
                                                      ---                   
following:

               (i)    legal fees, brokerage commissions, advertising costs or
                      other related expenses incurred by Landlord in connection
                      with the leasing of other space to individual tenants in
                      the Project;

                      ADDENDA TO LEASE AGREEMENT - Page 1
<PAGE>
 
               (ii)   repairs, alterations, or replacements made to rectify or
                      correct any original defect in the original design,
                      materials or workmanship of building or common areas.
                      However, all other repairs, alterations and replacements,
                      including those necessitated by wear and tear, are
                      included in Basic Operating Costs;

               (iii)  damage and repairs attributable to insured losses due to
                      fire or other casualty;

               (iv)   damage and repairs, necessitated by the active negligence
                      or willful misconduct of Landlord, Landlord's employees,
                      contractors or agents;

               (v)    executive salaries or salaries or service personnel to the
                      extent that such personnel perform services not solely in
                      connection with the management, operation, repair or
                      maintenance of the Building;

               (vi)   Landlord's general overhead expenses not related to the
                      Building;

               (vii)  legal fees, accountant's fees and other expenses incurred
                      in connection with disputes with tenants or occupants of
                      the Project other than Tenant or associated with the
                      enforcement of the terms of any leases with tenants or the
                      defense of Landlord's title to or interest in the Project
                      or any part thereof; any legal expenses incurred with
                      disputes with Tenant shall be recovered under the
                      provisions of Paragraph 33;

               (viii) costs (including permit, license and inspection fees)
                      incurred in renovations or otherwise improving,
                      decorating, painting or altering interior space for
                      tenants or other occupants other than Tenant or of vacant
                      space (excluding common areas) in the Project;

               (ix)   costs incurred due to a violation by Landlord or any other
                      tenant of the Project and not caused by Tenant, its
                      agents, invitees, subleasees, or assignees of the terms
                      and conditions of a lease;

               (x)    cost of any service provided to Tenant or other occupants
                      of the Project for which Landlord is fully reimbursed
                      except for reimbursement pursuant to this section;

               (xi)   any other expense which, under generally accepted
                      accounting principles applicable to real estate
                      operations, would not be considered a reasonable
                      maintenance and operating expense except as expressly
                      specified in this Lease;

               (xii)  In no event shall the Basic Operating Costs be increased
                      at a rate which exceeds ten percent (10%) per year over
                      the previous fiscal year during the first thirty (30)
                      months of the original Lease Term only. This cap on Basic
                      Operating Costs increases shall be applicable only to this
                      thirty (30) month period and shall not be applicable in
                      the event of a sale of the Project to Tandem Computers,
                      Inc. during this period.

Addendum No. 6.  Paragraph 8.C.  Indemnification.
------------------------------------------------ 

   Landlord shall indemnify Tenant and hold Tenant harmless against all
liabilities, charges and expenses (including reasonable attorneys fees, cost of
court and expenses necessary in the prosecution or defense of any litigation) by
reason of injury to person or property, including any liability for injury to
person or property of Landlord, its agents, servants, employees, or invitees,
while in or on the leased Premises during the term of this Lease resulting from
the negligence of Landlord, its agents, servants, employees, invitees or
authorized representatives.  Landlord shall indemnify Tenant and hold harmless
Tenant, its officers, agents, employees, parent, subsidiary and affiliate
organizations against any claims, suits, loss, costs (including attorneys fees
and cleanup costs), damage or liability by reason of property damage or personal
injury (including death) to the extent the same results from pollution or toxic
contamination caused by Landlord's actions or inaction, including, but not
limited to, those related to ownership, tenancy, possession, construction,
operation, or use by Landlord or by any other party of the leased Premises other
than Tandem Computers.  Tenant shall indemnify Landlord and hold harmless
Landlord, its partners, employees and affiliate organizations against any
claims, suits, loss, costs, (including attorneys fees and cleanup costs), damage
or liability by reason of property damage or personal injury (including death)
to the extent the same results from pollution or toxic contamination caused by
Tenant's actions or inaction, including, but not limited to, those related to
tenancy, possession, construction, operation, or use by Tenant, its agents,
servants, employees, invitees or authorized representatives.  This provision
shall survive any termination or expiration of the Lease.

                      ADDENDA TO LEASE AGREEMENT - Page 2
<PAGE>
 
Addendum No. 7.  Paragraph 9.  Waiver of Subrogation.
---------------------------------------------------- 

     To the extent permitted by law, and without affecting the coverage provided
by insurance required to be maintained hereunder, Landlord and Tenant mutually
waive all rights of recovery against the other for any loss from perils insured
against in any policy or policies of liability insurance and property insurance
(including that identified in 8.A. and 8.B. above), business interruption
insurance or rental value insurance obtained by either party.  The provision is
intended to waive fully, and for the benefit of each party, any rights and/or
claims which might give rise to a right of subrogation on any insurance carrier.
The coverage obtained by each party pursuant to this Lease shall include,
without limitation, a waiver of subrogation by the carrier which conforms to the
provisions of this paragraph.

Addendum No. 8.  Paragraph 10.  Landlord's Repairs and Services.
--------------------------------------------------------------- 

     Landlord shall provide Tenant with certification from a licensed mechanical
contractor (within the first thirty [30] days of Tenant's date of occupancy)
that all existing heating and air conditioning units are in good and operable
condition.  Tenant shall be responsible for the regularly scheduled preventative
maintenance/service (at least one service call per quarter) by a third party
mechanical contractor as described in Paragraph 11.  Tenant shall maintain
records of all service calls and any maintenance required as determined by the
maintenance contractor.

     If any of the existing heating and air conditioning units require a major
replacement part(s) (a heat exchanger, motor, compressor, or entire unit) during
the Lease Term, Tenant shall notify Landlord of the possible need to replace
such parts.  Landlord may, at its own expense, hire a mechanical contractor to
inspect the heating and air conditioning units to confirm the need to replace a
major replacement part(s).

     If Landlord determines from the information supplied by the mechanical
contractor(s) that a major replacement part(s) is required, then Landlord shall
order any such replacement.  Tenant shall be responsible for the first One
Thousand Five Hundred Dollars ($1,500) per quarter, or a maximum of Six Thousand
Dollars ($6,000) per year of expenditures for major replacement parts to the
existing heating and air conditioning units.  Landlord shall be responsible for
the expenses incurred above One Thousand Five Hundred Dollars ($1,500) per
quarter or above Six Thousand Dollars ($6,000) per year for major replacement
parts.

     If Tenant should fail to maintain regularly scheduled preventative
maintenance/service by a mechanical contractor at least once per quarter, then
Tenant shall be liable for all expenses incurred in replacement of major heating
and air conditioning parts.

     Landlord shall provide to Tenant, within the first thirty (30) days of
Tenant's occupancy, correspondence from a licensed roofing contractor that the
roof is in good condition as of the date of occupancy.  Tenant shall be
responsible for roof leaks on the Premises.

Addendum No. 9.  Paragraph 12.  Alterations.
------------------------------------------- 

     In the event that Tenant requires Landlord's approval under the terms of
this Paragraph in order to make an alteration or physical addition and Landlord
consents to said alteration, Landlord shall notify Tenant in writing along with
the consent whether Landlord will require Tenant to remove the alteration and
return the Premises to their original condition by the termination of this
Lease.

     Tenant may remove any Tenant-installed raised computer floor tiles and any
Tenant-installed computer room air conditioning units which are not roof-
mounted, provided that the Premises are restored to their original condition by
the termination of this Lease.  Any additions or alterations made by Tenant
shall conform to all applicable building codes and standards.

Addendum No. 10.  Paragraph 13.  Signs.
-------------------------------------- 

     Tenant shall have the right to construct and install, at Tenant's sole
expense, a freestanding monument type identification sign in front of the
Building, provided that Tenant first obtains prior written approval of the sign
size, design, and location from Landlord.  Tenant shall obtain all applicable
governmental approval for the sign at its sole expense.  All of Tenant's signs
shall at all times remain the property of Tenant and Tenant must remove its
signs at the expiration or earlier termination of the Lease Agreement.  Tenant
shall repair any damage caused in the removal of its sign.

                      ADDENDA TO LEASE AGREEMENT - Page 3
<PAGE>
 
Addendum No. 11.  Paragraph 21.  Assignment and Subletting.
---------------------------------------------------------- 

   Tenant may assign or sublet the entire Premises, or any portion thereof,
without Landlord's consent, to any corporation which controls ("control" shall
mean 50% ownership or more), is controlled by or is under common control with
the Tenant, or to any corporation resulting from the merger or consolidation
with Tenant, or to any person, legal entity which acquires all the assets of
Tenant as a going concern of the business that is being conducted on the
Premises provided that the net worth of the corporation, person or entity is
greater than or equal to the net worth of Tandem Computers, Inc., at the date of
execution of this Lease, and provided that said assignee assumes, in full, the
obligations of Tenant under this Lease.  Any such assignment shall not, in any
way, affect or limit the liability of Tandem Computers, Inc. under the terms of
this Lease.

Addendum No. 12.  Paragraph 25.  Holding Over.
--------------------------------------------- 

     If Tenant shall retain of the Premises or any portion thereof without
Landlord's consent following the expiration of the Lease or sooner termination
for any reason, then Tenant shall pay to Landlord for each day of such retention
according to the following schedule:

          Days  1 - 30:            110% of the daily rental for the last month
                                   prior to the date of expiration or
                                   termination.

          Days 31 - 60:            125% of the daily rental for the last month
                                   prior to the date of expiration or
                                   termination.

          Days 61 and thereafter:  15% of the daily rental for the last month
                                   prior to the date of expiration or
                                   termination.

                      ADDENDA TO LEASE AGREEMENT - Page 4
<PAGE>
 
[EXHIBIT A is a map or diagram of the property.]
<PAGE>
 
LEGAL DESCRIPTION:
------------------

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

COMMENCING at the intersection of the prolongation of the Easterly line of that
certain 19.27 acre tract conveyed by James E. Glendenning, et al to Joseph G.
Glendenning, by Deed dated November 25, 1914, and recorded November 25, 1914, in
Book 423 of Deeds, at Page 424, Santa Clara County Records, with the Southerly
line of Lot 5 as said Lot 5 is shown upon that certain Map entitled, "MAP OF
PARTITION OF THE GLENDENNING ESTATES IN THE QUITO-RANCHO", which Map was filed
for record in the office of the County Recorder of Santa Clara County on October
24, 1884 in Book "B" of Maps at Page 15; thence Easterly along the said
Southerly line of Lot 5, North 89 degrees 24' 39" East 513.56 feet; thence South
0 degrees 26' 11" West 954.95 feet; thence North 67 degrees 29' 18" East 40.72
feet to the True Point of Beginning; thence from said True Point of Beginning
along the Westerly line of said 10.00 foot wide strip of land, North 0 degrees
26' 11" East 660.07 feet; thence along the arc of a curve to the right having a
radius of 50.00 feet through a central angle of 88 degrees 581 31" at an arc
length of 77.65 feet; thence North 89 degrees 24' 42" East 250.94 feet to a
point on the Easterly line of the tract of land conveyed to Joe Marchese, et ux,
by Deed recorded October 5, 1944 in Book 1227 of Official Records, Page 30;
thence along said Easterly line South 0 degrees 48' West 580 feet to the
Southeasterly corner of said Lot 4, as said Lot 4 is shown upon that certain Map
entitled, "MAP OF THE PARTITION OF THE GLENDENNING ESTATES IN THE QUITO-RANCHO",
which Map was filed for record in the office of the County Recorder of Santa
Clara County on October 24, 1884 in Book "B" of Maps, at Page 15; thence along
the Southeasterly line of said Lot 4, South 67 degrees 29' 18" West 320 feet
more or less to the True Point of Beginning.

                                   EXHIBIT A
<PAGE>
 
                              Tenant Improvements