Document:

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________________________________________________________________________________

                            LEASE AGREEMENT BETWEEN

                    W9/CGN REAL ESTATE LIMITED PARTNERSHIP,

                               AS LANDLORD, AND

                             TENFOLD CORPORATION,

                                   AS TENANT

                            DATED FEBRUARY 4, 2000

                           600 LAS COLINAS BOULEVARD
                                 IRVING, TEXAS

________________________________________________________________________________
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                            BASIC LEASE INFORMATION
                            -----------------------

Lease Date:         February 4, 2000

Landlord:           W9/CGN REAL ESTATE LIMITED PARTNERSHIP, a Delaware limited
                    partnership

Tenant:             TENFOLD CORPORATION, a Delaware corporation

Premises:           Suite No. 600, containing 23,386 rentable square feet, in
                    the office building commonly known as 600 Las Colinas
                    Boulevard (the "Building"), and whose street address is 600
                                    --------
                    East Las Colinas Boulevard, Irving, Texas 75039. The
                    Premises are outlined on the plan attached to the Lease as
                    Exhibit A-1. The land on which the Building is located (the
                    -----------
                    "Land") is described on Exhibit B. The term "Building"
                     ----                   ---------
                    includes the related land, driveways, parking facilities,
                    and similar improvements.

Term:               Approximately 60 months, commencing on the Commencement Date
                    and ending at 5:00 p.m. local time on the last day of the
                    60th full calendar month following the Commencement Date,
                    subject to adjustment and earlier termination as provided in
                    the Lease.

Commencement Date:  The earliest of (a) the date on which Tenant occupies any
                    portion of the Premises and begins conducting business
                    therein, (b) the date on which the Work (as defined in
                    Exhibit D hereto) in the Premises is Substantially Completed
                    ---------
                    (as defined in Exhibit D hereto), (c) the date on which the
                                   ---------
                    Work in the Premises would have been Substantially Completed
                    but for the occurrence of any Tenant Delay Days (as defined
                    in Exhibit D hereto), or (d) April 1, 2000.
                       ---------

Basic Rent:         Basic Rent shall be the following amounts for the following
                    periods of time:

                    ------------------------------------------------------------
                                     Monthly Basic Rent
                                     per Rentable Square
                       Lease Month          Foot           Monthly Basic Rent
                    ------------------------------------------------------------
                          1 - 24           $22.50               $43,848.75
                    ------------------------------------------------------------
                         25 - 36           $24.00               $46,772.00
                    ------------------------------------------------------------
                         37 - 60           $25.50               $49,695.25
                    ------------------------------------------------------------

                    As used herein, the term "Lease Month" shall mean each
                                              -----------
                    calendar month during the Term (and if the Commencement Date
                    does not occur on the first day of a calendar month, the
                    period from the Commencement Date to the first day of the
                    next calendar month shall be included in the first Lease
                    Month for purposes of determining the duration of the Term
                    and the monthly Basic Rent rate applicable for such partial
                    month).

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Security Deposit:   [Intentionally deleted.]

Rent:               Basic Rent, Tenant's Proportionate Share of Taxes and
                    Electrical Costs, Tenant's share of Additional Rent, and all
                    other sums that Tenant may owe to Landlord or otherwise be
                    required to pay under the Lease.

Permitted Use:      General office use, including software development, training
                    and demonstrations.

Tenant's Proportionate Share:
                    4.589%, which is the percentage obtained by dividing (a) the
                    number of rentable square feet in the Premises as stated
                    above by (b) the 509,559 rentable square feet in the
                    Building. Landlord and Tenant stipulate that the number of
                    rentable square feet in the Premises and in the Building set
                    forth above shall be binding upon them.

Expense Stop:       Operating Costs per rentable square foot in the Building for
                    the calendar year 2000 (grossed up as provided in Section
                    4.(b)(6) of the Lease).

Base Tax Year:      The calendar year 2000.

Initial Liability Insurance Amount:
                    $3,000,000.

Tenant's        Tenfold Corporation             With a copy to:
Address:        180 West Election Road          --------------
                Suite 100                       Tenfold Corporation
                Draper, Utah 84020              100 Foster City Boulevard
                Attention: General Counsel      Suite 200
                Telephone: 801-495-1010         Foster City, California 94404
                Telecopy: 801-495-0353          Attention: Lease Administrator
                                                Telephone: 650-570-5711
                                                Telecopy: 650-570-5988

Landlord's      For all Notices:                With a copy to:
Address:        ---------------                 --------------
                W9/CGN Real Estate Limited      W9/CGN Real Estate Limited
                Partnership                     Partnership
                c/o Grubb & Ellis               c/o Archon Group, L.P.
                600 E. Las Colinas Boulevard,   600 East Las Colinas Blvd.,
                Suite 100                       Suite 400
                Irving, Texas 75039             Irving, Texas 75039
                Attention: Property Manager     Attention: General Counsel -
                Telephone: 972-869-0044         600 Las Colinas Blvd.
                Telecopy: 972-869-2043          Telephone: 972-368-2200
                                                Telecopy: 972-368-3199

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The foregoing Basic Lease Information is incorporated into and made a part of
the Lease identified above.  If any conflict exists between any Basic Lease
Information and the Lease, then the Lease shall control.

LANDLORD:                W9/CGN REAL ESTATE LIMITED PARTNERSHIP, a Delaware
                         limited partnership
                         By: W9/CGN Gen-Par, Inc., a Delaware corporation, its
                             general partner

                             By: /s/ William G. Mundinger II
                                ----------------------------
                             Name: William G. Mundinger II
                                  --------------------------
                             Title: Assistant Vice President
                                   -------------------------

TENANT:                  TENFOLD CORPORATION, a Delaware corporation

                         By: /s/ Robert P. Hughes
                            --------------------------------
                         Name: Robert P. Hughes
                              ------------------------------
                         Title: Chief Financial Officer
                               -----------------------------

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                                     LEASE
                                     -----

     THIS LEASE AGREEMENT (this "Lease") is entered into as of February 4, 2000,
                                 -----
between W9/CGN REAL ESTATE LIMITED PARTNERSHIP, a Delaware limited partnership
("Landlord"), and TENFOLD CORPORATION, a Delaware corporation ("Tenant").
  --------                                                      ------

     1.   Definitions and Basic Provisions.  The definitions and basic
          --------------------------------
provisions set forth in the Basic Lease Information (the "Basic Lease
                                                          -----------
Information") executed by Landlord and Tenant contemporaneously herewith are
-----------
incorporated herein by reference for all purposes.  Additionally, the following
terms shall have the following meanings when used in this Lease: "Affiliate"
                                                                  ---------
means any person or entity which, directly or indirectly, through one or more
intermediaries, controls, is controlled by, or is under common control with the
party in question; "Building's Structure" means the Building's exterior walls,
                    --------------------
roof, elevator shafts, footings, foundations, structural portions of load-
bearing walls, structural floors and subfloors, and structural columns and
beams; "Building's Systems" means the Building's HVAC, elevators, life-safety,
        ------------------
plumbing, electrical, and mechanical systems; "including" means including,
                                               ---------
without limitation; "Laws" means all federal, state, and local laws, rules and
                     ----
regulations, all court orders, governmental directives, and governmental orders,
and all restrictive covenants affecting the Building, and "Law" shall mean any
                                                           ---
of the foregoing; and "Tenant Party" means any of the following persons:
                       ------------
Tenant; any assignees claiming by, through, or under Tenant; any subtenants
claiming by, through, or under Tenant; and any of their respective agents,
contractors, employees, and invitees.

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

     3.   Tender of Possession. Landlord and Tenant presently anticipate that
          --------------------
possession of the Premises will be tendered to Tenant (with the Work to be
performed by Landlord therein, if any, Substantially Completed) on or about
March 15, 2000 (the "Estimated Delivery Date").  If Landlord is unable to tender
                     -----------------------
possession of the Premises in such condition to Tenant by the Estimated Delivery
Date, then (a) Landlord shall not be in default hereunder or be liable for
damages therefor, and (b) Tenant shall accept possession of the Premises when
Landlord tenders possession thereof to Tenant.  Notwithstanding the foregoing,
if the Work in the Premises is not Substantially Completed by the Completion
Termination Date, Tenant may terminate this Lease by delivering to Landlord
written notice thereof at any time before the earlier of (1) ten days following
the Completion Termination Date or (2) the date on which the Work in the
Premises is Substantially Completed.  The termination right afforded to Tenant
under this Section 3 shall be Tenant's sole remedy for Landlord's failure to
timely Substantially Complete the Work.  Time is of the essence for the delivery
of Tenant's termination notice under this Section 3; accordingly, if Tenant
fails timely to deliver any such notice, Tenant's right to terminate this Lease
under this Section 3 shall expire. As used herein, "Completion Termination Date"
                                                    ---------------------------
means 180 days after the Estimated Delivery Date, plus the number of Tenant
Delay Days and the number of Force Majeure Delay Days.  As used herein, "Force
                                                                         -----
Majeure Delay Days" means any delay in achieving Substantial Completion with
------------------
respect to the Work for the reasons specified in Section 25.(c) of this Lease.
By occupying the Premises, Tenant shall be deemed to have accepted the Premises
in their condition as of the date of such occupancy, subject to the performance
of punch-list items that remain to be performed by Landlord, if any.  Prior to
occupying the Premises, Tenant shall execute and deliver to Landlord a letter
substantially in the form of Exhibit E hereto confirming (A) the Commencement
                             ---------
Date and the expiration date of the initial Term, (B) that Tenant has accepted
the Premises, and (C) that Landlord has performed all of its obligations with
respect to the Premises (except for punch-list

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items specified in such letter). Occupancy of the Premises by Tenant prior to
the Commencement Date shall be subject to all of the provisions of this Lease
excepting only those requiring the payment of Basic Rent, Additional Rent, Taxes
and Electrical Costs (each as defined herein).

     4.   Rent.
          ----

          (a)  Payment.  Tenant shall timely pay to Landlord Rent, without
               -------
notice, demand, deduction or set off (except as otherwise expressly provided
herein), at Landlord's address provided for in this Lease or as otherwise
specified by Landlord and shall be accompanied by all applicable state and local
sales or use taxes.  Basic Rent, adjusted as herein provided, shall be payable
monthly in advance.  The first monthly installment of Basic Rent shall be
payable contemporaneously with the execution of this Lease; thereafter, Basic
Rent shall be payable on the first day of each month beginning on the first day
of the second full calendar month of the Term.  The monthly Basic Rent for any
partial month at the beginning of the Term shall equal the product of 1/365 of
the annual Basic Rent in effect during the partial month and the number of days
in the partial month from and after the Commencement Date, and shall be due on
the Commencement Date.

          (b)  Operating Costs; Taxes; Electrical Costs.
               ----------------------------------------

               (1)  Tenant shall pay to Landlord the amount (per each rentable
     square foot in the Premises) ("Additional Rent") by which the annual
                                    ---------------
     Operating Costs (defined below) per rentable square foot in the Building
     exceed the Expense Stop (per rentable square foot in the Building).
     Landlord may make a good faith estimate of the Additional Rent to be due by
     Tenant for any calendar year or part thereof during the Term. During each
     calendar year or partial calendar year of the Term (after the base year, if
     the Expense Stop is calculated on a base year basis), Tenant shall pay to
     Landlord, in advance concurrently with each monthly installment of Basic
     Rent, an amount equal to the estimated Additional Rent for such calendar
     year or part thereof divided by the number of months therein. From time to
     time, Landlord may estimate and re-estimate the Additional Rent to be due
     by Tenant and deliver a copy of the estimate or re-estimate to Tenant.
     Thereafter, the monthly installments of Additional Rent payable by Tenant
     shall be appropriately adjusted in accordance with the estimations so that,
     by the end of the calendar year in question, Tenant shall have paid all of
     the Additional Rent as estimated by Landlord. Any amounts paid based on
     such an estimate shall be subject to adjustment as herein provided when
     actual Operating Costs are available for each calendar year.

          (2)  The term "Operating Costs" shall mean all expenses and
                         ---------------
     disbursements (subject to the limitations set forth below) that Landlord
     incurs in connection with the ownership, operation, and maintenance of the
     Building, determined in accordance with sound accounting principles
     consistently applied, including the following costs: (A) wages and salaries
     (including management fees consistent with other similar class A buildings
     in the Las Colinas Urban Center) of all on-site employees at or below the
     grade of senior building manager engaged in the operation, maintenance or
     security of the Building (together with Landlord's reasonable allocation of
     expenses of off-site employees at or below the grade of senior building
     manager who perform a portion of their services in connection with the
     operation, maintenance or security of the Building), including taxes,
     insurance and benefits relating thereto; (B) all supplies and materials
     used in the operation, maintenance, repair, replacement, and security of
     the Building; (C) costs for improvements made to the Building which,
     although capital in nature, are reasonably expected to reduce the normal

                                       2
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     operating costs (including all utility costs) of the Building, as amortized
     using a commercially reasonable interest rate over the time period
     reasonably estimated by Landlord to recover the costs thereof taking into
     consideration the anticipated cost savings, as determined by Landlord using
     its good faith, commercially reasonable judgment, as well as capital
     improvements made in order to comply with any Law hereafter promulgated by
     any governmental authority or any interpretation hereafter rendered with
     respect to any existing Law, as amortized using a commercially reasonable
     interest rate over the useful economic life of such improvements as
     determined by Landlord in its reasonable discretion; (D) cost of all
     utilities, except Electrical Costs and the cost of other utilities
     reimbursable to Landlord by the Building's tenants other than pursuant to a
     provision similar to this Section 4.(b); (E) insurance expenses; (F)
     repairs, replacements, and general maintenance of the Building except those
     repair and replacement costs that are reimbursed by warranties or insurance
     proceeds; and (G) service or maintenance contracts with independent
     contractors for the operation, maintenance, repair, replacement, or
     security of the Building (including alarm service, window cleaning, and
     elevator maintenance).

          Operating Costs shall not include costs for (i) capital improvements
     made to the Building, other than capital improvements described in Section
     4.(b)(2)(C) and except for items which are generally considered maintenance
     and repair items, such as painting of common areas, replacement of carpet
     in elevator lobbies, and the like; (ii) repair, replacements and general
     maintenance paid by proceeds of insurance or by Tenant or other third
     parties; (iii) interest, amortization or other payments on loans to
     Landlord; (iv) depreciation; (v) leasing commissions; (vi) legal expenses
     for services, other than those that benefit the Building tenants generally
     (e.g., tax disputes); (vii) renovating or otherwise improving space for
     occupants of the Building or vacant space in the Building; (viii) Taxes;
     (ix) federal income taxes imposed on or measured by the income of Landlord
     from the operation of the Building; (x) original construction costs of the
     Building; (xi) reserves for repairs, maintenance and replacements (as
     opposed to escrows for such things as taxes and insurance expenses, both of
     which may be included in Operating Costs); (xii) costs or expenses
     associated with leasing space in the Building or the sale of any interest
     in the Building, including advertising and marketing, commissions or any
     amounts paid for on behalf of a tenant such as space planning, moving
     costs, rental and other tenant concessions; (xiii) ground rents; (xiv)
     costs of electricity outside normal business hours sold to tenants of the
     Building by Landlord or any other special service to tenants or service in
     excess of that furnished to Tenant or which are over and above the rent and
     escalations payable under the lease agreement with that tenant (including
     after-hour HVAC costs); (xv) expenses for repairs, replacements or
     improvements arising from the initial construction of the Building to the
     extent such expenses are either a) reimbursed to Landlord by virtue of
     warranties from contractors or suppliers or b) result by reason of
     deficiencies in design or workmanship except conditions resulting from
     ordinary wear and tear; (xvi) the excess over competitive costs by
     independent suppliers and contractors, of the cost of supplies and services
     provided by subsidiaries and affiliates of Landlord; (xvii) Landlord's
     general overhead except to the extent it is expended in direct connection
     with management and operation of the Building; (xviii) accounting or legal
     fees incurred in tenant disputes, or in procuring tenants, or for fees not
     related to the operation and maintenance of the Building but personal to
     Landlord; (xix) all costs shall be "net" only and shall be reduced by the
     amount of insurance (or the amount of reimbursement if Landlord would have
     maintained insurance per Landlord's requirements in the Lease),
     condemnation awards or other reimbursement, recoupment, payment, discount,
     warrantee, guarantee or allowance received by Landlord; (xx) costs of
     renovating or otherwise improving space for new tenants or in renovating
     space vacated by any tenant or any other work which Landlord performs for

                                       3
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     any tenant; (xxi) costs relating to maintaining Landlord's existence,
     either as a corporation, partnership, or other entity, such as trustee's
     fees, annual fees, partnership organization or administration expenses,
     deed recordation expenses, legal and accounting fees (other than with
     respect to Building operations); (xxii) interest or penalties arising by
     reason of Landlord's failure to timely pay any Operating Costs or Taxes,
     provided such late payment was caused (in whole or in part) by a Tenant
     Party; (xxiii) costs incurred to contain, encapsulate, remove or remedy any
     hazardous or toxic wastes, materials or substances from either the Building
     or Land or any tests or surveys obtained in connection with the above,
     unless such incurred costs are caused, in whole or in part, by a Tenant
     Party; (xxiv) rental and other expenses incurred in leasing air condition
     systems, elevators or other equipment considered to be of a capital nature
     under generally accepted accounting principles, except equipment used in
     emergency situations or in providing janitorial services when such
     equipment is not affixed to the Building; (xxv) costs incurred because the
     Building or common areas violate any valid, applicable building code,
     regulation or law in effect and as interpreted by government authorities
     before the date on which this Lease is signed (including fines, penalties,
     interest and the costs of repairs, replacements, alterations or
     improvements necessary to make the Building or common areas comply with
     applicable past laws in effect and as interpreted by government authorities
     before the date on which this Lease is signed, such as sprinkler
     installation or requirements under the Americans With Disabilities Act of
     1990; (xxvi) costs for acquisitions of sculpture, paintings or other
     objects of art; (xxvii) title insurance, automobile insurance, key man and
     other life insurance, long-term disability insurance and health, accident
     and sickness insurance, excepting only group plans providing reasonable
     benefits to persons of the grade of building manager and below employed in
     the operation and management of the Building (provided that the cost of
     insurance with respect to any such employee dividing his or her time
     between the Building and any other buildings shall be apportioned pro rata
     among all such buildings); (xxviii) the cost of removal of halon or CFCs
     from the Building, unless the cost incurred is cause, in whole or in part,
     by a Tenant Party; and (xxix) costs of any items for which Landlord
     receives reimbursement from insurance proceeds (insurance proceeds shall be
     excluded from Operating Costs in the year in which they are received,
     except that any deductible amount under any insurance policy shall be
     included within Operating Costs). If the Expense Stop is calculated on a
     base year basis, Operating Costs for the base year only shall not include
     market-wide labor-rate increases due to extraordinary circumstances,
     including boycotts and strikes; utility rate increases due to extraordinary
     circumstances, including conservation surcharges, boycotts, embargos or
     other shortages; or amortized costs relating to capital improvements.

               (3)  Tenant shall also pay its Proportionate Share of any
     increase in Taxes for each year and partial year falling within the Term
     over the Taxes for the Base Tax Year. Tenant shall pay its Proportionate
     Share of Taxes in the same manner as provided above for Additional Rent
     with regard to Operating Costs. "Taxes" shall mean taxes, assessments, and
                                      -----
     governmental charges or fees whether federal, state, county or municipal,
     and whether they be by taxing districts or authorities presently taxing or
     by others, subsequently created or otherwise, and any other taxes and
     assessments (including non-governmental assessments for common charges
     under a restrictive covenant or other private agreement that are not
     treated as part of Operating Costs) now or hereafter attributable to the
     Building (or its operation), excluding, however, penalties and interest
     thereon and federal and state taxes on income (if the present method of
     taxation changes so that in lieu of the whole or any part of any Taxes,
     there is levied on Landlord a capital tax directly on the rents received
     therefrom or a franchise tax, assessment, or charge based, in whole or in
     part, upon such rents for the Building, then all such taxes, assessments,
     or charges, or the part thereof so based, shall

                                       4
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     be deemed to be included within the term "Taxes" for purposes hereof).
     Taxes shall include the actual and reasonable costs of consultants retained
     in an effort to lower taxes and all costs incurred in disputing any taxes
     or in seeking to lower the tax valuation of the Building. For property tax
     purposes, Tenant waives all rights to protest or appeal the appraised value
     of the Premises, as well as the Building, and all rights to receive notices
     of reappraisement as set forth in Sections 41.413 and 42.015 of the Texas
     Tax Code.

               (4)  Tenant shall also pay to Landlord Tenant's Proportionate
     Share of the cost of all electricity used by the Building ("Electrical
                                                                 ----------
     Costs"). Such amount shall be payable in monthly installments on the
     -----
     Commencement Date and on the first day of each calendar month thereafter.
     Each installment shall be based on Landlord's estimate of the amount due
     for each month. From time to time during any calendar year, Landlord may
     estimate or re-estimate the Electrical Costs to be due by Tenant for that
     calendar year and deliver a copy of the estimate or re-estimate to Tenant.
     Thereafter, the monthly installments of Electrical Costs payable by Tenant
     shall be appropriately adjusted in accordance with the estimations.
     Electrical Costs shall be billed at actual cost from the local utility
     without any markup or service charges. Landlord's reasonable estimate of
     calendar year 2000 Electrical Costs is $1.07 per rentable square foot in
     the Building; however, Landlord and Tenant agree that such figure shall not
     be interpreted as the maximum amount which may be charged to Tenant for
     Electrical Costs per rentable square foot during calendar year 2000.

               (5)  By April 1 of each calendar year, or as soon thereafter as
     practicable, Landlord shall furnish to Tenant a statement of Operating
     Costs and Electrical Costs for the previous year, in each case adjusted as
     provided in Section 4.(b)(6), and of the Taxes for the previous year (the
     "Operating Costs and Tax Statement").  If Tenant's estimated payments of
      ---------------------------------
     Operating Costs, Electrical Costs or Taxes under this Section 4.(b) for the
     year covered by the Operating Costs and Tax Statement exceed Tenant's share
     of such items as indicated in the Operating Costs and Tax Statement, then
     Landlord shall promptly credit or reimburse Tenant for such excess;
     likewise, if Tenant's estimated payments of Operating Costs, Electrical
     Costs or Taxes under this Section 4.(b) for such year are less than
     Tenant's share of such items as indicated in the Operating Costs and Tax
     Statement, then Tenant shall promptly pay Landlord such deficiency.

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

               (7)  Provided no Event of Default then exists, after receiving an
     annual Operating Costs and Tax Statement and giving Landlord 30-days' prior
     written notice thereof, Tenant may inspect or audit Landlord's records
     relating to Operating Costs for the period of time covered by such
     Operating Costs and Tax Statement in accordance with the following
     provisions. If Tenant fails to object to the calculation of Operating Costs
     on an annual Operating Costs and Tax Statement within 30 days after the
     statement has been delivered to Tenant, or if Tenant fails to conclude its
     audit or inspection within 90 days after the statement has been delivered
     to Tenant, then Tenant shall have waived its right to object to the
     calculation of Operating Costs for the year in question and the calculation
     of Operating Costs set forth on such statement shall be final. Tenant's
     audit or inspection shall be conducted where Landlord maintains its books
     and records, shall not unreasonably interfere

                                       5
<PAGE>

     with the conduct of Landlord's business, and shall be conducted only during
     business hours reasonably designated by Landlord. Tenant shall pay the cost
     of such audit or inspection, including $150 per hour of Landlord's or the
     building manager's employee time devoted to such inspection or audit in
     excess of the first four hours (Landlord shall provide the first four such
     hours to Tenant free of charge) to reimburse Landlord for its overhead
     costs allocable to the inspection or audit, unless the total Operating
     Costs for the period in question is determined to be in error by more than
     5% in the aggregate, and, as a result thereof, Tenant paid to Landlord
     $0.50 per square foot in the Premises more than the actual Operating Costs
     due for such period, in which case Landlord shall pay the audit cost (not
     to exceed the amount Tenant was overcharged for the period in question).
     Tenant may not conduct an inspection or have an audit performed more than
     once during any calendar year. Tenant or the accounting firm conducting
     such audit shall, at no charge to Landlord, submit its audit report in
     draft form to Landlord for Landlord's review and comment before the final
     approved audit report is submitted to Landlord, and any reasonable comments
     by Landlord shall be incorporated into the final audit report. If such
     inspection or audit reveals that an error was made in the Operating Costs
     previously charged to Tenant, then Landlord shall refund to Tenant any
     overpayment of any such costs, or Tenant shall pay to Landlord any
     underpayment of any such costs, as the case may be, within 30 days after
     notification thereof. Provided Landlord's accounting for Operating Costs is
     consistent with the terms of this Lease, Landlord's good faith judgment
     regarding the proper interpretation of this Lease and the proper accounting
     for Operating Costs shall be binding on Tenant in connection with any such
     audit or inspection. Tenant shall maintain the results of each such audit
     or inspection confidential and shall not be permitted to use any third
     party to perform such audit or inspection, other than a certified public
     accountant (A) reasonably acceptable to Landlord, (B) which is not
     compensated on a contingency fee basis or in any other manner which is
     dependent upon the results of such audit or inspection (and Tenant shall
     deliver the fee agreement or other similar evidence of such fee arrangement
     to Landlord upon request), and (C) which agrees with Landlord in writing to
     maintain the results of such audit or inspection confidential.
     Notwithstanding the foregoing, Tenant shall have no right to conduct an
     audit if Landlord furnishes to Tenant an audit report for the period of
     time in question prepared by an independent certified public accounting
     firm of recognized national standing (whether originally prepared for
     Landlord or another party). Nothing in this Section 4.(b)(7) shall be
     construed to limit, suspend or abate Tenant's obligation to pay Rent when
     due, including Additional Rent.

     5.   Delinquent Payment; Handling Charges.  All past due payments required
          ------------------------------------
of Tenant hereunder shall bear interest from the date due until paid at the
lesser of eighteen percent per annum or the maximum lawful rate of interest;
additionally, Landlord may charge Tenant a fee equal to five percent of the
delinquent payment to reimburse Landlord for its cost and inconvenience incurred
as a consequence of Tenant's delinquency.  In no event, however, shall the
charges permitted under this Section 5 or elsewhere in this Lease, to the extent
they are considered to be interest under applicable Law, exceed the maximum
lawful rate of interest.  Notwithstanding the foregoing, the late fee referenced
above shall not be charged with respect to the first two occurrences (but not
any subsequent occurrence) during any 12-month period that Tenant fails to make
payment when due, until five days after Landlord delivers written notice of such
delinquency to Tenant.

     6.   Security Deposit.  Landlord agrees to waive Tenant's payment of a
          ----------------
security deposit (the "Security Deposit") in connection with the execution of
                       ----------------
this Lease.  Notwithstanding the foregoing, if, during the three-month period
immediately preceding the leasing by Tenant during the initial Term of any
additional space in the Building (including under Tenant's Right of Opportunity
hereunder), Tenant's

                                       6
<PAGE>

Tangible Net Worth (defined below) decreases to a level below Tenant's Tangible
Net Worth for the third quarter of 1999 (which amount is stipulated by Landlord
and Tenant to be $57,671,000), Tenant shall deliver to Landlord a standby,
unconditional, irrevocable letter of credit (the "Letter of Credit") in the face
                                                  ----------------
amount of the construction allowance plus all commissions paid by Landlord for
leasing the space in question. The Letter of Credit shall be issued by any of
the five largest national banking associations with banking offices in Dallas,
Texas, shall permit partial draws thereon, and shall otherwise be in the form of
Exhibit J attached hereto or another form reasonably acceptable to Landlord.
---------
Tenant shall from time to time cause its letter of credit to be renewed no later
than 30 days prior to any expiration date thereof so that its letter of credit
remains in effect for 30 days after the scheduled expiration date of the Term or
any renewal Term; if Tenant fails timely to renew its letter of credit, then
Landlord shall have the right to draw thereon, and retain the amounts so drawn
as the Security Deposit. Landlord may draw upon the letter of credit and apply
the proceeds thereof to perform any of Tenant's unperformed obligations under
this Lease. After any such draw, Tenant shall pay to Landlord on demand the
amount so drawn to be held as part of the Security Deposit. Tenant hereby
irrevocably appoints Landlord its true and lawful attorney-in-fact, such power
of attorney being coupled with an interest, with full power of substitution, to
do any one or more of the following in its sole discretion upon the occurrence
of an Event of Default under the Lease: (1) demand, collect, receive, sue for,
compound and give acquittance for any and all amounts which may be or become due
or payable with respect to the letter of credit and all funds evidenced thereby,
(2) execute any and all withdrawal receipts or others orders for the payment of
money drawn from the letter of credit, (3) endorse the name of Tenant on all
commercial paper given in payment or in partial payment of the letter of credit,
(4) file any claim or institute any proceeding with respect to the letter of
credit, (5) transfer the letter of credit into the name of Landlord or its
nominee, and (6) take any other action which Landlord may deem necessary or
appropriate to protect and preserve the right, title, and interest of Landlord
under the Lease. To further secure Tenant's obligations under the Lease, Tenant
hereby pledges to Landlord, and grants to Landlord a security interest in, the
letter of credit, and all renewals and replacements thereof, and proceeds
therefrom. The Security Deposit is not an advance payment of Rent or a measure
or limit of Landlord's damages upon an Event of Default (as defined herein).
Landlord may, from time to time following an Event of Default and without
prejudice to any other remedy, use all or a part of the Security Deposit to
perform any obligation Tenant fails to perform hereunder. Following any such
application of the Security Deposit, Tenant shall pay to Landlord on demand the
amount so applied in order to restore the Security Deposit to its original
amount. Provided that Tenant has performed all of its obligations hereunder,
Landlord shall, within 30 days after the Term ends, return to Tenant the portion
of the Security Deposit which was not applied to satisfy Tenant's obligations.
The Security Deposit may be commingled with other funds, and no interest shall
be paid thereon. If Landlord transfers its interest in the Premises and the
transferee assumes Landlord's obligations under this Lease, then Landlord may
assign the Security Deposit to the transferee and Landlord thereafter shall have
no further liability for the return of the Security Deposit.

     7.   Landlord's Obligations.
          ----------------------

          (a)  Services.  Landlord shall furnish to Tenant (1) water at those
               --------
points of supply provided for general use of tenants of the Building; (2) heated
and refrigerated air conditioning ("HVAC") as appropriate, at such temperatures
                                    ----
and in such amounts as are consistent with other similar class A buildings in
the Las Colinas Urban Center; (3) janitorial service to the Premises on
weekdays, other than holidays, for Building-standard installations in accordance
with the janitorial specifications in Exhibit K hereto (Landlord reserves the
                                      ---------
right to modify and/or replace such specifications from time to time so long as
such modifications and/or replacement specifications are consistent with the
janitorial services provided in other similar class A buildings in the Las
Colinas Urban Center) and such window washing as may from

                                       7
<PAGE>

time to time be reasonably required; (4) elevators for ingress and egress to the
floor on which the Premises are located, in common with other tenants, provided
that Landlord may reasonably limit the number of operating elevators during non-
business hours and holidays; and (5) electrical current during normal business
hours for equipment that does not require more than 110 volts and whose
electrical energy consumption does not exceed normal office usage. Landlord
shall maintain the common areas of the Building in reasonably good order and
condition, except for damage caused by a Tenant Party. If Tenant desires any of
the services specified in Section 7.(a)(2): (A) at any time other than between
8:00 a.m. and 6:00 p.m. on weekdays and between 8:00 a.m. and 1:00 p.m. on
Saturday (in each case other than holidays), or (B) on Sunday or holidays, then
such services shall be supplied to Tenant upon the written request of Tenant
delivered to Landlord before 3:00 p.m. on the business day preceding such extra
usage, and Tenant shall pay to Landlord the cost of such services within 30 days
after Landlord has delivered to Tenant an invoice therefor. The costs incurred
by Landlord in providing after-hour HVAC service to Tenant shall include costs
for electricity, water, sewage, water treatment, labor, metering, filtering, and
maintenance reasonably allocated by Landlord to providing such service.
Landlord's reasonable estimate of calendar year 2000 after-normal-business-hours
charges for HVAC is $25 per hour per one-half floor of the Building (with a two-
hour minimum); however, Landlord and Tenant agree that such figure shall not be
interpreted as the maximum amount which may be charged to Tenant for such
services.

          (b)  Excess Utility Use.  Landlord shall not be required to furnish
               ------------------
electrical current  for equipment that requires more than 110 volts or other
equipment whose electrical energy consumption exceeds normal office usage.  If
Tenant's requirements for or consumption of electricity exceed the electricity
to be provided by Landlord as described in Section 7.(a), Landlord shall, at
Tenant's expense, make reasonable efforts to supply such service through the
then-existing feeders and risers serving the Building and the Premises, and
Tenant shall pay to Landlord the cost of such service within 30 days after
Landlord has delivered to Tenant an invoice therefor.  Landlord may determine
the amount of such additional consumption and potential consumption by any
verifiable method, including installation of a separate meter in the Premises
installed, maintained, and read by Landlord, at Tenant's expense.  Tenant shall
not install any electrical equipment requiring special wiring or requiring
voltage in excess of 110 volts or otherwise exceeding Building capacity unless
approved in advance by Landlord.  The use of electricity in the Premises shall
not exceed the capacity of existing feeders and risers to or wiring in the
Premises.  Any risers or wiring required to meet Tenant's excess electrical
requirements shall, upon Tenant's written request, be installed by Landlord, at
Tenant's cost, if, in Landlord's judgment, the same are necessary and shall not
cause permanent damage to the Building or the Premises, cause or create a
dangerous or hazardous condition, entail excessive or unreasonable alterations,
repairs, or expenses, or interfere with or disturb other tenants of the
Building. If Tenant uses machines or equipment in the Premises which affect the
temperature otherwise maintained by the air conditioning system or otherwise
overload any utility, Landlord may install supplemental air conditioning units
or other supplemental equipment in the Premises, and the cost thereof, including
the cost of installation, operation, use, and maintenance, shall be paid by
Tenant to Landlord within 30 days after Landlord has delivered to Tenant an
invoice therefor.

          (c)  Restoration of Services; Abatement.  Landlord shall use
               ----------------------------------
commercially reasonable efforts to restore any service required of it that
becomes unavailable; however, such unavailability shall not render Landlord
liable for any damages caused thereby, be a constructive eviction of Tenant,
constitute a breach of any implied warranty, or, except as provided in the next
sentence, entitle Tenant to any abatement of Tenant's obligations hereunder.
If, however, Tenant is prevented from using the Premises for more than 15
consecutive business days because of the unavailability of any such service (or
seven consecutive business days because of the unavailability and the
restoration of such services is within the reasonable control of

                                       8
<PAGE>

Landlord) and such unavailability was not caused by a Tenant Party, then Tenant
shall, as its exclusive remedy be entitled to a reasonable abatement of Rent for
each consecutive day (after such 15-day period [or after such seven-day period,
as applicable]) that Tenant is so prevented from using the Premises.

     8.   Improvements; Alterations; Repairs; Maintenance.
          -----------------------------------------------

          (a)  Improvements; Alterations.  Improvements to the Premises shall be
               -------------------------
installed at Tenant's expense only in accordance with plans and specifications
which have been previously submitted to and approved in writing by Landlord,
which approval shall be governed by standards in the following sentence.  No
alterations or physical additions in or to the Premises may be made without
Landlord's prior written consent, which shall not be unreasonably withheld,
conditioned or delayed; however, Landlord may withhold its consent to any
alteration or addition that would adversely affect (in the reasonable discretion
of Landlord) (1) the Building's Structure or the Building's Systems (including
the Building's restrooms or mechanical rooms), (2) the exterior appearance of
the Building, or (3) the appearance of the Building's common areas or elevator
lobby areas.  Tenant shall not paint or install lighting or decorations, signs,
window or door lettering, or advertising media of any type on or about the
Premises without the prior written consent of Landlord, which shall not be
unreasonably withheld, conditioned or delayed; however, Landlord may withhold
its consent to any such painting or installation which would affect the
appearance of the exterior of the Building or of any common areas of the
Building.  Notwithstanding the foregoing, Tenant shall not be required to obtain
Landlord's consent for repainting, recarpeting, or other alterations, tenant
improvements, alterations or physical additions to the Premises which are
cosmetic in nature totaling less than $10,000 in any single instance or series
of related alternations performed within a six-month period (provided that
Tenant shall not perform any improvements, alterations or additions to the
Premises in stages as a means to subvert this provision), in each case provided
that (A) Tenant delivers to Landlord written notice thereof, a list of
contractors and subcontractors to perform the work (and certificates of
insurance for each such party) and any plans and specifications therefor prior
to commencing any such alterations, additions, or improvements (for
informational purposes only so long as no consent is required by Landlord as
required by this Lease), (B) the installation thereof does not involve any core
drilling or the configuration or location of any exterior of interior walls of
the Building, and (C) such alterations, additions and improvements will not
affect (i) the Building's Structure or the Building's Systems, (ii) the
provision of services to other Building tenants, or (iii) the appearance of the
Building's common areas or the exterior of the Building.  All alterations,
additions, and improvements shall be constructed, maintained, and used by
Tenant, at its risk and expense, in accordance with all Laws; Landlord's consent
to or approval of any alterations, additions or improvements (or the plans
therefor) shall not constitute a representation or warranty by Landlord, nor
Landlord's acceptance, that the same comply with sound architectural and/or
engineering practices or with all applicable Laws, and Tenant shall be solely
responsible for ensuring all such compliance.

          (b)  Repairs; Maintenance.  Tenant shall maintain the Premises in a
               --------------------
clean, safe, and operable condition, and shall not permit or allow to remain any
waste or damage to any portion of the Premises.  Tenant shall repair or replace,
subject to Landlord's direction and supervision, any damage to the Building
caused by a Tenant Party.  If Tenant fails to make such repairs or replacements
within 15 business days after the occurrence of such damage, then Landlord may
make the same at Tenant's cost.  If any such damage occurs outside of the
Premises, then Landlord may elect to repair such damage at Tenant's expense,
rather than having Tenant repair such damage.  The cost of all repair or
replacement work performed by Landlord under this Section 8 shall be paid by
Tenant to Landlord within 30 days after Landlord has invoiced Tenant therefor.

          (c)  Performance of Work.  All work described in this Section 8 shall
               -------------------
be performed only by Landlord or by contractors and subcontractors approved in
writing by Landlord. Tenant shall cause all contractors and subcontractors to
procure and maintain insurance coverage naming Landlord as an additional insured
against such risks, in such amounts, and with such companies as Landlord may
reasonably require. All such work shall be performed in accordance with all Laws
and in a good and workmanlike manner so as not to damage the Building (including
the Premises, the Building's Structure and the Building's Systems). All such
work which may affect the Building's Structure or the Building's Systems must be
approved by the Building's engineer of record, at Tenant's expense and, at
Landlord's election, must be performed by Landlord's usual contractor for such
work.

                                       9

          (d)  Mechanic's Liens. Tenant shall not permit any mechanic's liens to
               ----------------
be filed against the Premises or the Building for any work performed, materials
furnished, or obligation incurred by or at the request of Tenant.  If such a
lien is filed, then Tenant shall, within ten business days after Landlord has
delivered notice of the filing thereof to Tenant (or such earlier time period as
may be necessary to prevent the forfeiture of the Building or any interest of
Landlord therein or the imposition of a civil or criminal fine with respect
thereto), either (1) pay the amount of the lien and cause the lien to be
released of record, or (2) diligently contest such lien and deliver to Landlord
a bond or other security reasonably satisfactory to Landlord.  If Tenant fails
to timely take either such action, then Landlord may pay the lien claim, and any
amounts so paid, including expenses and interest, shall be paid by Tenant to
Landlord within ten days after Landlord has invoiced Tenant therefor.  All
materialmen, contractors, artisans, mechanics, laborers and any other persons
now or hereafter contracting with Tenant or any contractor or subcontractor of
Tenant for the furnishing of any labor, services, materials, supplies or
equipment with respect to any portion of the Premises, at any time from the date
hereof until the end of the Term, are hereby charged with notice that they look
exclusively to Tenant to obtain payment for same.  Nothing herein shall be
deemed a consent by Landlord to any liens being placed upon the Building or
Landlord's interest therein due to any work performed by or for Tenant.

     9.   Use.  Tenant shall continuously occupy and use the Premises only for
          ---
the Permitted Use and shall comply with all Laws relating to the use, condition,
access to, and occupancy of the Premises.  The population density within the
Premises as a whole shall at no time exceed one person for each 200 rentable
square feet in the Premises.  Tenant shall not conduct second or third shift
operations within the Premises; however, Tenant may use the Premises after
normal business hours, so long as Tenant is not generally conducting business
from the Premises after normal business hours.  The Premises shall not be used
for any use which is disreputable, creates extraordinary fire hazards, or
results in an increased rate of insurance on the Building or its contents, or
for the storage of any Hazardous Materials (other than typical office supplies
[e.g., photocopier toner] and then only in compliance with all Laws).  Tenant
shall not use any substantial portion of the Premises for a "call center," any
other telemarketing use, or any credit processing use.  If, because of a Tenant
Party's acts, the rate of insurance on the Building or its contents increases,
then such acts shall be an Event of Default, Tenant shall pay to Landlord the
amount of such increase on demand, and acceptance of such payment shall not
waive any of Landlord's other rights.  Tenant shall conduct its business and
control each other Tenant Party so as not to create any nuisance or unreasonably
interfere with other tenants or Landlord in its management of the Building.

     10.  Assignment and Subletting.
          -------------------------

          (a)  Transfers.  Except as provided in Section 10.(g), Tenant shall
               ---------
not, without the prior written consent of Landlord, (1) assign, transfer, or
encumber this Lease or any estate or interest herein, whether directly or by
operation of law, (2) permit any other entity to become Tenant hereunder by
merger, consolidation, or other reorganization, (3) if Tenant is an entity other
than a corporation whose stock is publicly traded, permit the transfer of an
ownership interest in Tenant so as to result in a change in the current control
of Tenant, (4) sublet any portion of the Premises, (5) grant any license,
concession, or other right of occupancy of any portion of the Premises, or (6)
permit the use of the Premises by any parties other than Tenant (any of the
events listed in Section 10.(a)(1) through 10.(a)(6) being a "Transfer").
                                                              --------

          (b)  Consent Standards.  Landlord shall not unreasonably withhold or
               -----------------
delay its consent to any assignment or subletting of the Premises, provided that
the proposed transferee (1) is creditworthy, (2) has a reasonably good
reputation in the business community, (3) will use the Premises for the
Permitted Use (thus, excluding, without limitation, uses for credit processing
and telemarketing) and will not use the Premises in any manner that would
conflict with any exclusive use agreement or other similar agreement entered
into by Landlord with any other tenant of the Building, (4) is not a
governmental entity, or subdivision or agency thereof, (5) is not another
occupant of the Building, and (6) is not a person or entity with whom Landlord
is negotiating to lease space in the Building; otherwise, Landlord may withhold
its consent in its sole discretion.

                                      10

          (c)  Request for Consent.  If Tenant requests Landlord's consent to a
               -------------------
Transfer, then, at least 15 business days prior to the effective date of the
proposed Transfer, Tenant shall provide Landlord with a written description of
all terms and conditions of the proposed Transfer, copies of the proposed
documentation, and the following information about the proposed transferee: name
and address; reasonably satisfactory information about its business and business
history; its proposed use of the Premises; banking, financial, and other credit
information; and general references sufficient to enable Landlord to determine
the proposed transferee's creditworthiness and character.  Concurrently with
Tenant's notice of any request for consent to a Transfer, Tenant shall pay to
Landlord a fee of $500 to defray Landlord's expenses in reviewing such request,
and Tenant shall also reimburse Landlord immediately upon request for its
reasonable attorneys' fees incurred in connection with considering any request
for consent to a Transfer.  If Landlord fails to notify Tenant that it approves
or disapproves the requested Transfer within 15 business days after submission
to Landlord of all of the items required under this Section 10 and the Tenant's
request for consent conspicuously states, "IF YOU DO NOT MAIL YOUR APPROVAL OR
DISAPPROVAL OF THE REQUESTED TRANSFER WITHIN 15 BUSINESS DAYS AFTER YOU RECEIVE
THIS REQUEST FOR CONSENT, YOUR APPROVAL OF THIS TRANSFER WILL BE DEEMED GIVEN,"
then Landlord shall be deemed to have approved such Transfer.

          (d)  Conditions to Consent.  If Landlord consents to a proposed
               ---------------------
Transfer, then the proposed transferee shall deliver to Landlord a written
agreement whereby it expressly assumes Tenant's obligations hereunder; however,
any transferee of less than all of the space in the Premises shall be liable
only for obligations under this Lease that are properly allocable to the space
subject to the Transfer for the period of the Transfer.  No Transfer shall
release Tenant from its obligations under this Lease, but rather Tenant and its
transferee shall be jointly and severally liable therefor.  Landlord's consent
to any Transfer shall not waive Landlord's rights as to any subsequent
Transfers.  If an Event of Default occurs while the Premises or any part thereof
are subject to a Transfer, then Landlord, in addition to its other remedies, may
collect directly from such transferee all rents becoming due to Tenant and apply
such rents against Rent.

                                      11
<PAGE>

Tenant authorizes its transferees to make payments of rent directly to Landlord
upon receipt of notice from Landlord to do so following the occurrence of an
Event of Default hereunder. Tenant shall pay for the cost of any demising walls
or other improvements necessitated by a proposed subletting or assignment.

          (e)  Cancellation.  Landlord may, within 20 business days after
               ------------
submission of Tenant's written request for Landlord's consent to an assignment
or subletting, cancel this Lease as to the portion of the Premises proposed to
be sublet or assigned as of the date the proposed Transfer is to be effective.
If Landlord cancels this Lease as to any portion of the Premises, then this
Lease shall cease for such portion of the Premises and Tenant shall pay to
Landlord all Rent accrued through the cancellation date relating to the portion
of the Premises covered by the proposed Transfer.  Thereafter, Landlord may
lease such portion of the Premises to the prospective transferee (or to any
other person) without liability to Tenant. Notwithstanding the foregoing, if
Landlord provides written notification to Tenant of its election to cancel this
Lease as to any portion of the Premises as provided above, Tenant may rescind
its proposed assignment or subletting of all or any portion of the Premises by
notifying Landlord in writing within three business days following Landlord's
written cancellation notice.

          (f)  Additional Compensation. While no Event of Default exists, Tenant
               -----------------------
shall pay to Landlord, immediately upon receipt thereof, 50% of the excess of
(1) all compensation received by Tenant for a Transfer less the costs reasonably
incurred by Tenant with unaffiliated third parties in connection with such
Transfer (i.e., brokerage commissions, tenant finish-work, and the like) over
(2) the Rent allocable to the portion of the Premises covered thereby.  While
any Event of Default exists, Tenant shall pay to Landlord, immediately upon
receipt thereof, 100% of the excess of (A) all compensation received by Tenant
for a Transfer over (B) the Rent allocable to the portion of the Premises
covered thereby.

          (g)  Permitted Transfers.  Notwithstanding Section 10.(a), Tenant may
               -------------------
Transfer all or part of its interest in this Lease or all or part of the
Premises (a "Permitted Transfer") to the following types of entities (a
             ------------------
"Permitted Transferee") without the written consent of Landlord:
 --------------------

               (1)  an Affiliate of Tenant;

               (2)  any corporation, limited partnership, limited liability
     partnership, limited liability company or other business entity in which or
     with which Tenant, or its corporate successors or assigns, is merged or
     consolidated, in accordance with applicable statutory provisions governing
     merger and consolidation of business entities, so long as (A) Tenant's
     obligations hereunder are assumed by the entity surviving such merger or
     created by such consolidation; and (B) the Tangible Net Worth of the
     surviving or created entity is not less than the Tangible Net Worth of
     Tenant as of the date hereof; or

               (3)  any corporation, limited partnership, limited liability
     partnership, limited liability company or other business entity acquiring
     all or substantially all of Tenant's assets if such entity's Tangible Net
     Worth after such acquisition is not less than the Tangible Net Worth of
     Tenant as of the date hereof.

Tenant shall promptly notify Landlord of any such Permitted Transfer.  Tenant
shall remain liable for the performance of all of the obligations of Tenant
hereunder, or if Tenant no longer exists because of a merger, consolidation, or
acquisition, the surviving or acquiring entity shall expressly assume in writing
the obligations of Tenant hereunder.  Additionally, the Permitted Transferee
shall comply with all of the terms

                                      12
<PAGE>

and conditions of this Lease, including the Permitted Use, and the use of the
Premises by the Permitted Transferee may not violate any other agreements
affecting the Premises, the Building, Landlord or other tenants of the Building.
At least 30 days after the effective date of any Permitted Transfer, Tenant
agrees to furnish Landlord with copies of the instrument effecting any of the
foregoing Transfers and documentation establishing Tenant's satisfaction of the
requirements set forth above applicable to any such Transfer. The occurrence of
a Permitted Transfer shall not waive Landlord's rights as to any subsequent
Transfers. "Tangible Net Worth" means the excess of total assets over total
            ------------------
liabilities, in each case as determined in accordance with generally accepted
accounting principles consistently applied ("GAAP"), excluding, however, from
                                             ----
the determination of total assets all assets which would be classified as
intangible assets under GAAP including goodwill, licenses, patents, trademarks,
trade names, copyrights, and franchises. Any subsequent Transfer by a Permitted
Transferee shall be subject to the terms of this Section 10.

     11.  Insurance; Waivers; Subrogation; Indemnity.
          ------------------------------------------

          (a)  Tenant's Insurance. Tenant shall maintain throughout the Term the
               ------------------
following insurance policies: (1) commercial general liability insurance in
amounts of $3,000,000 per occurrence or, following the expiration of the initial
Term, such other amounts as Landlord may from time to time reasonably require
(and, if the use and occupancy of the Premises include any activity or matter
that is or may be excluded from coverage under a commercial general liability
policy [e.g., the sale, service or consumption of alcoholic beverages], Tenant
shall obtain such endorsements to the commercial general liability policy or
otherwise obtain insurance to insure all liability arising from such activity or
matter [including liquor liability, if applicable] in such amounts as Landlord
may reasonably require), insuring Tenant, Landlord, Landlord's agents and their
respective Affiliates against all liability for injury to or death of a person
or persons or damage to property arising from the use and occupancy of the
Premises, (2) insurance covering the full value of Tenant's property and
improvements, and other property (including property of others) in the Premises,
(3) contractual liability insurance sufficient to cover Tenant's indemnity
obligations hereunder (but only if such contractual liability insurance is not
already included in Tenant's commercial general liability insurance policy), (4)
worker's compensation insurance, and (5) business interruption insurance.
Tenant's insurance shall provide primary coverage to Landlord when any policy
issued to Landlord provides duplicate or similar coverage, and in such
circumstance Landlord's policy will be excess over Tenant's policy.  Tenant
shall furnish to Landlord certificates of such insurance and such other evidence
satisfactory to Landlord of the maintenance of all insurance coverages required
hereunder, and Tenant shall obtain a written obligation on the part of each
insurance company to notify Landlord at least 30 days before cancellation or a
material change of any such insurance policies.  All such insurance policies
shall be in form, and issued by companies, reasonably satisfactory to Landlord.

          (b)  Landlord's Insurance. Throughout the Term of this Lease, Landlord
               --------------------
shall maintain, as a minimum, the following insurance policies:  (1) fire and
extended risk insurance for the Building's replacement value and (2) commercial
general liability insurance in an amount of not less than $3,000,000. The cost
of all insurance carried by Landlord with respect to the Building shall be
included in Operating Costs.  The foregoing insurance policies and any other
insurance carried by Landlord shall be for the sole benefit of Landlord and
under Landlord's sole control, and Tenant shall have no right or claim to any
proceeds thereof or any other rights thereunder.

          (c)  No Subrogation.  Landlord and Tenant each waives any claim it
               --------------
might have against the other for any injury to or death of any person or persons
or damage to or theft, destruction, loss, or loss of use of any property (a
"Loss"), to the extent the same is insured against under any insurance policy
 ----
that

                                      13
<PAGE>

covers the Building, the Premises, Landlord's or Tenant's fixtures, personal
property, leasehold improvements, or business, or is required to be insured
against under the terms hereof, regardless of whether the negligence of the
other party caused such Loss. Each party shall cause its insurance carrier to
endorse all applicable policies waiving the carrier's rights of recovery under
subrogation or otherwise against the other party.

          (d)  Indemnity.  Subject to Section 11.(c), Tenant shall defend,
               ---------
indemnify, and hold harmless Landlord and its representatives and agents from
and against all claims, demands, liabilities, causes of action, suits,
judgments, damages, and expenses (including attorneys' fees) arising from (1)
any Loss arising from any occurrence on the Premises or (2) Tenant's failure to
perform its obligations under this Lease, even though caused or alleged to be
caused by the negligence or fault of Landlord or its agents (other than a Loss
arising from the sole or gross negligence of Landlord or its agents), and even
though any such claim, cause of action, or suit is based upon or alleged to be
based upon the strict liability of Landlord or its agents.  This indemnity is
intended to indemnify Landlord and its agents against the consequences of their
own negligence or fault as provided above when Landlord or its agents are
jointly, comparatively, contributively, or concurrently negligent with Tenant.
Subject to Section 11.(c), Landlord shall defend, indemnify, and hold harmless
Tenant and its agents from and against all claims, demands, liabilities, causes
of action, suits, judgments, and expenses (including attorneys' fees) for any
Loss arising from any occurrence in the Building's common areas, even though
caused or alleged to be caused by the negligence or fault of Tenant or its
agents (other than a Loss arising from the sole or gross negligence of Tenant or
its agents), and even though any such claim, cause of action, or suit is based
upon or alleged to be based upon the strict liability of Tenant or its agents.
This indemnity is intended to indemnify Tenant and its agents against the
consequences of their own negligence or fault as provided above when Tenant or
its agents are jointly, comparatively, contributively, or concurrently negligent
with Landlord.  The indemnities set forth in this Section 11.(d) shall survive
termination or expiration of this Lease and shall not terminate or be waived,
diminished or affected in any manner by any abatement or apportionment of Rent
under any provision of this Lease.  If any proceeding is filed for which
indemnity is required hereunder, the indemnifying party agrees, upon request
therefor, to defend the indemnified party in such proceeding at its sole cost
utilizing counsel satisfactory to the indemnified party.

     12.  Subordination; Attornment; Notice to Landlord's Mortgagee.
          ---------------------------------------------------------

          (a)  Subordination.  This Lease shall be subordinate to any deed of
               -------------
trust, mortgage, or other security instrument (each, a "Mortgage"), or any
                                                        --------
ground lease, master lease, or primary lease (each, a "Primary Lease"), that now
                                                       -------------
or hereafter covers all or any part of the Premises (the mortgagee under any
such Mortgage, beneficiary under any such deed of trust, or the lessor under any
such Primary Lease is referred to herein as a "Landlord's Mortgagee").  Landlord
                                               --------------------
shall use reasonable efforts to obtain a subordination, non-disturbance and
attornment agreement from the current Landlord's Mortgagee in the form of
Exhibit L hereto within 60 days from the date hereof; however, Landlord's
---------
failure to deliver such agreement shall not constitute a default by Landlord
hereunder nor affect the subordination of the Lease as provided in this Section;
and further provided that any administration fee or other similar cost imposed
by Landlord's Mortgagee in connection with obtaining such subordination, non-
disturbance and attornment agreement shall be paid by Tenant within 15 days
after Landlord's written request therefor.  Any Landlord's Mortgagee may elect,
at any time, unilaterally, to make this Lease superior to its Mortgage, Primary
Lease, or other interest in the Premises by so notifying Tenant in writing.  The
provisions of this Section shall be self-operative and no further instrument of
subordination shall be required; however, in confirmation of such subordination,
Tenant shall execute and return to Landlord (or such other party designated by
Landlord)

                                      14
<PAGE>

within ten business days after written request therefor such documentation, in
recordable form if required, as a Landlord's Mortgagee may reasonably request to
evidence the subordination of this Lease to such Landlord's Mortgagee's Mortgage
or Primary Lease (including a subordination, non-disturbance and attornment
agreement) or, if the Landlord's Mortgagee so elects, the subordination of such
Landlord's Mortgagee's Mortgage or Primary Lease to this Lease.

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

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

          (d)  Landlord's Mortgagee's Protection Provisions.  If Landlord's
               --------------------------------------------
Mortgagee shall succeed to the interest of Landlord under this Lease, Landlord's
Mortgagee shall not be: (1) liable for any act or omission of any prior lessor
(including Landlord); (2) bound by any rent or additional rent or advance rent
which Tenant might have paid for more than the current month to any prior lessor
(including Landlord), and all such rent shall remain due and owing,
notwithstanding such advance payment; (3) bound by any security or advance
rental deposit made by Tenant which is not delivered or paid over to Landlord's
Mortgagee and with respect to which Tenant shall look solely to Landlord for
refund or reimbursement; (4) bound by any termination, amendment or modification
of this Lease made without Landlord's Mortgagee's consent and written approval,
except for those terminations, amendments and modifications permitted to be made
by Landlord without Landlord's Mortgagee's consent pursuant to the terms of the
loan documents between Landlord and Landlord's Mortgagee; (5) subject to the
defenses which Tenant might have against any prior lessor (including Landlord);
and (6) subject to the offsets which Tenant might have against any prior lessor
(including Landlord) except for those offset rights which (A) are expressly
provided in this Lease, (B) relate to periods of time following the acquisition
of the Building by Landlord's Mortgagee, and (C) Tenant has provided written
notice to Landlord's Mortgagee and provided Landlord's Mortgagee a reasonable
opportunity to cure the event giving rise to such offset event.  Landlord's
Mortgagee shall have no liability or responsibility under or pursuant to the
terms of this Lease or otherwise after it ceases to own an interest in the
Building.  Nothing in this Lease shall be construed to require Landlord's
Mortgagee to see to the application of the proceeds of any loan, and Tenant's
agreements set forth herein shall not be impaired on account of any modification
of the documents evidencing and securing any loan.

     13.  Rules and Regulations.  Tenant shall comply with the rules and
          ---------------------
regulations of the Building which are attached hereto as Exhibit C.  Landlord
                                                         ---------
may, from time to time, change such rules and regulations for the safety, care,
or cleanliness of the Building and related facilities, provided that such
changes are applicable to all tenants of the Building, will not unreasonably or
materially interfere with Tenant's use of the Premises and are enforced by
Landlord in a non-discriminatory manner.  Tenant shall be responsible for the
compliance with such rules and regulations by each Tenant Party.

                                      15
<PAGE>

     14.  Condemnation.
          ------------

          (a)  Total Taking.  If the entire Building or Premises are taken by
               ------------
right of eminent domain or conveyed in lieu thereof (a "Taking"), this Lease
                                                        ------
shall terminate as of the date of the Taking.

          (b)  Partial Taking - Tenant's Rights.  If any part of the Building
               --------------------------------
becomes subject to a Taking and such Taking will prevent Tenant from conducting
its business in the Premises in a manner reasonably comparable to that conducted
immediately before such Taking for a period of more than 180 days, then Tenant
may terminate this Lease as of the date of such Taking by giving written notice
to Landlord within 30 days after the Taking, and Basic Rent and Additional Rent
shall be apportioned as of the date of such Taking.  If Tenant does not
terminate this Lease, then Rent shall be abated on a reasonable basis as to that
portion of the Premises rendered untenantable by the Taking.

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

          (d)  Award.  If any Taking occurs, then Landlord shall receive the
               -----
entire award or other compensation for the Land, the Building, and other
improvements taken; however, Tenant may separately pursue a claim (to the extent
it will not reduce Landlord's award) against the condemnor for the value of
Tenant's personal property which Tenant is entitled to remove under this Lease,
moving costs, loss of business, and other claims it may have.

     15.  Fire or Other Casualty.
          ----------------------

          (a)  Repair Estimate.  If the Premises or the Building are damaged by
               ---------------
fire or other casualty (a "Casualty"), Landlord shall, within 75 days after such
                           --------
Casualty, deliver to Tenant a good faith estimate (the "Damage Notice") of the
                                                        -------------
time needed to repair the damage caused by such Casualty.

          (b)  Tenant's Rights. If a material portion of the Premises is damaged
               ---------------
by Casualty such that Tenant is prevented from conducting its business in the
Premises in a manner reasonably comparable to that conducted immediately before
such Casualty and Landlord estimates that the damage caused thereby cannot be
repaired within 210 days after the Casualty (the "Repair Period"), then Tenant
                                                  -------------
may terminate this Lease by delivering written notice to Landlord of its
election to terminate within 30 days after the Damage Notice has been delivered
to Tenant.

          (c)  Landlord's Rights.  If a Casualty damages the Premises or a
               -----------------
material portion of the Building and (1) Landlord estimates that the damage to
the Premises cannot be repaired within the Repair Period, (2) the damage to the
Premises exceeds 50% of the replacement cost thereof (excluding foundations and
footings), as estimated by Landlord, and such damage occurs during the last two
years of the Term, (3) regardless of the extent of damage to the Premises,
Landlord makes a good faith determination that restoring the Building would be
uneconomical, or (4) Landlord is required to pay any insurance proceeds arising
out

                                      16
<PAGE>

of the Casualty to a Landlord's Mortgagee, then Landlord may terminate this
Lease by giving written notice of its election to terminate within 30 days after
the Damage Notice has been delivered to Tenant.

          (d)  Repair Obligation.  If neither party elects to terminate this
               -----------------
Lease following a Casualty, then Landlord shall, within a reasonable time after
such Casualty, begin to repair the Premises and shall proceed with reasonable
diligence to restore the Premises to substantially the same condition as they
existed immediately before such Casualty; however, Landlord shall only be
required to reconstruct the Premises to the extent of any improvements existing
therein on the date of the damage that were installed by Landlord as part of the
Work (if any) pursuant to Exhibit D ("Landlord's Contribution"), and Landlord's
                          ---------   -----------------------
obligation to repair or restore the Premises shall be limited to the extent of
the insurance proceeds (plus any applicable deductible amounts) actually
received by Landlord for the Casualty in question.  Tenant shall be responsible
for repairing or replacing its furniture, equipment, fixtures, alterations and
other improvements which Landlord is not obligated to restore, and shall use the
proceeds of its insurance for such purpose. Tenant shall pay the difference
between the total cost of reconstructing the Premises and Landlord's
Contribution ("Tenant's Contribution").
               ---------------------

          (e)  Abatement of Rent.  If the Premises are damaged by Casualty, Rent
               -----------------
for the portion of the Premises rendered untenantable by the damage shall be
abated from the date of damage until the completion of Landlord's repairs (or
until the date of termination of this Lease by Landlord or Tenant as provided
above, as the case may be), unless such damage was caused solely by a Tenant
Party, in which case, Tenant shall continue to pay Rent without abatement.

     16.  Personal Property Taxes.  Tenant shall be liable for all taxes levied
          -----------------------
or assessed against personal property, furniture, or fixtures placed by Tenant
in the Premises.  If any taxes for which Tenant is liable are levied or assessed
against Landlord or Landlord's property and Landlord elects to pay the same, or
if the assessed value of Landlord's property is increased by inclusion of such
personal property, furniture or fixtures and Landlord elects to pay the taxes
based on such increase, then Tenant shall pay to Landlord, within 30 days
following written request, the part of such taxes for which Tenant is primarily
liable hereunder; however, Landlord shall not pay such amount if Tenant notifies
Landlord that it will contest the validity or amount of such taxes before
Landlord makes such payment, and thereafter diligently proceeds with such
contest in accordance with Law and if the non-payment thereof does not pose a
threat of loss or seizure of the Building or interest of Landlord therein or
impose any fee or penalty against Landlord.

     17.  Events of Default.  Each of the following occurrences shall be an
          -----------------
"Event of Default":
 ----------------

          (a)  Payment Default.  Tenant's failure to pay Rent within five
               ---------------
business days after Landlord has delivered written notice to Tenant that the
same is due; however, an Event of Default shall occur hereunder without any
obligation of Landlord to give any notice if Tenant fails to pay Rent when due
and, during the 12 month interval preceding such failure, Landlord has given
Tenant written notice of failure to pay Rent on one or more occasions;

          (b)  Vacation.  Tenant vacates the Premises or any substantial portion
               --------
thereof;

          (c)  Estoppel.  Tenant fails to provide any estoppel certificate after
               --------
Landlord's written request therefor pursuant to Section 25.(e) and such failure
shall continue for five days after Landlord's second written notice thereof to
Tenant;

                                      17
<PAGE>

          (d)  Other Defaults.  Tenant's failure to perform, comply with, or
               --------------
observe any other agreement or obligation of Tenant under this Lease and the
continuance of such failure for a period of more than 30 days after Landlord has
delivered to Tenant written notice thereof; and

          (e)  Insolvency.  The filing of a petition by or against Tenant (the
               ----------
term "Tenant" shall include, for the purpose of this Section 17.(e), any
      ------
guarantor of Tenant's obligations hereunder) (1) in any bankruptcy or other
insolvency proceeding; (2) seeking any relief under any state or federal debtor
relief law; (3) for the appointment of a liquidator or receiver for all or
substantially all of Tenant's property or for Tenant's interest in this Lease;
or (4) for the reorganization or modification of Tenant's capital structure;
however, if such a petition is filed against Tenant, then such filing shall not
be an Event of Default unless Tenant fails to have the proceedings initiated by
such petition dismissed within 90 days after the filing thereof.

     18.  Remedies.  Upon any Event of Default, Landlord may, in addition to all
          --------
other rights and remedies afforded Landlord hereunder or by law or equity, take
any one or more of the following actions:

          (a)  Termination of Lease.  Terminate this Lease by giving Tenant
               --------------------
written notice thereof, in which event Tenant shall pay to Landlord the sum of
(1) all Rent accrued hereunder through the date of termination, (2) all amounts
due under Section 19.(a), and (3) an amount equal to (A) the total Rent that
Tenant would have been required to pay for the remainder of the Term discounted
to present value at a per annum rate equal to the "Prime Rate" as published on
the date this Lease is terminated by The Wall Street Journal, Southwest Edition,
in its listing of "Money Rates" minus one percent, minus (B) the then present
fair rental value of the Premises for such period, similarly discounted;

          (b)  Termination of Possession.  Terminate Tenant's right to possess
               -------------------------
the Premises without terminating this Lease by giving written notice thereof to
Tenant, in which event Tenant shall pay to Landlord (1) all Rent and other
amounts accrued hereunder to the date of termination of possession, (2) all
amounts due from time to time under Section 19.(a), and (3) all Rent and other
net sums required hereunder to be paid by Tenant during the remainder of the
Term, diminished by any net sums thereafter received by Landlord through
reletting the Premises during such period, after deducting all costs incurred by
Landlord in reletting the Premises.  If Landlord elects to proceed under this
Section 18.(b), Landlord may remove all of Tenant's property from the Premises
and store the same in a public warehouse or elsewhere at the cost of, and for
the account of, Tenant, without becoming liable for any loss or damage which may
be occasioned thereby.  Landlord shall use reasonable efforts to relet the
Premises on such terms as Landlord in its sole discretion may determine
(including a term different from the Term, rental concessions, and alterations
to, and improvement of, the Premises); however, Landlord shall not be obligated
to relet the Premises before leasing other portions of the Building.  Landlord
shall not be liable for, nor shall Tenant's obligations hereunder be diminished
because of, Landlord's failure to relet the Premises or to collect rent due for
such reletting.  Tenant shall not be entitled to the excess of any consideration
obtained by reletting over the Rent due hereunder.  Reentry by Landlord in the
Premises shall not affect Tenant's obligations hereunder for the unexpired Term;
rather, Landlord may, from time to time, bring an action against Tenant to
collect amounts due by Tenant, without the necessity of Landlord's waiting until
the expiration of the Term.  Unless Landlord delivers written notice to Tenant
expressly stating that it has elected to terminate this Lease, all actions taken
by Landlord to dispossess or exclude Tenant from the Premises shall be deemed to
be taken under this Section 18.(b).  If Landlord elects to proceed under this
Section 18.(b), it may at any time elect to terminate this Lease under Section
18.(a); or

                                      18
<PAGE>

          (c)  Alteration of Locks. Additionally, with or without notice, and to
               -------------------
the extent permitted by Law, Landlord may alter locks or other security devices
at the Premises to deprive Tenant of access thereto, and Landlord shall not be
required to provide a new key or right of access to Tenant.

     19.  Payment by Tenant; Non-Waiver; Cumulative Remedies.
          --------------------------------------------------

          (a)  Payment by Tenant. Upon any Event of Default, Tenant shall pay to
               -----------------
Landlord all costs incurred by Landlord (including court costs and reasonable
attorneys' fees and expenses) in (1) obtaining possession of the Premises, (2)
removing and storing Tenant's or any other occupant's property, (3) repairing,
restoring, altering, remodeling, or otherwise putting the Premises into
condition reasonably acceptable to a new tenant for similar space in the Las
Colinas Urban Center, (4) if Tenant is dispossessed of the Premises and this
Lease is not terminated, reletting all or any part of the Premises (including
brokerage commissions, cost of tenant finish work, and other costs incidental to
such reletting for similar space in the Las Colinas Urban Center), (5)
performing Tenant's obligations which Tenant failed to perform, and (6)
enforcing, or advising Landlord of, its rights, remedies, and recourses arising
out of the Event of Default. To the full extent permitted by law, Landlord and
Tenant agree the federal and state courts of the state in which the Premises are
located shall have exclusive jurisdiction over any matter relating to or arising
from this Lease and the parties' rights and obligations under this Lease.

          (b)  No Waiver.  Landlord's acceptance of Rent following an Event of
               ---------
Default shall not waive Landlord's rights regarding such Event of Default.  No
waiver by Landlord of any violation or breach of any of the terms contained
herein shall waive Landlord's rights regarding any future violation of such
term.  Landlord's acceptance of any partial payment of Rent shall not waive
Landlord's rights with regard to the remaining portion of the Rent that is due,
regardless of any endorsement or other statement on any instrument delivered in
payment of Rent or any writing delivered in connection therewith; accordingly,
Landlord's acceptance of a partial payment of Rent shall not constitute an
accord and satisfaction of the full amount of the Rent that is due.

          (c)  Cumulative Remedies.  Any and all remedies set forth in this
               -------------------
Lease:  (1) shall be in addition to any and all other remedies Landlord may have
at law or in equity, (2) shall be cumulative, and (3) may be pursued
successively or concurrently as Landlord may elect.  The exercise of any remedy
by Landlord shall not be deemed an election of remedies or preclude Landlord
from exercising any other remedies in the future.

     20.  Landlord's Lien.  [Intentionally Deleted].
          ---------------

     21.  Surrender of Premises.  No act by Landlord shall be deemed an
          ---------------------
acceptance of a surrender of the Premises, and no agreement to accept a
surrender of the Premises shall be valid unless it is in writing and signed by
Landlord.  At the expiration or termination of this Lease, Tenant shall deliver
to Landlord the Premises with all improvements located therein in good repair
and condition, free of Hazardous Materials placed on the Premises during the
Term, broom-clean, reasonable wear and tear (and condemnation and Casualty
damage not caused by Tenant, as to which Sections 14 and 15 shall control)
excepted, and shall deliver to Landlord all keys to the Premises.  Provided that
Tenant has performed all of its obligations hereunder, Tenant may remove all
unattached trade fixtures, furniture, and personal property placed in the
Premises or elsewhere in the Building by Tenant (but Tenant may not remove any
such item which was paid for, in whole or in part, by Landlord or any wiring or
cabling unless Landlord requires such removal). Additionally, at Landlord's
option, Tenant shall remove such alterations, additions, improvements, trade

                                      19
<PAGE>

fixtures, personal property, equipment, wiring, cabling, and furniture as
Landlord may request; however, Tenant shall not be required to remove any
addition or improvement to the Premises if Landlord has specifically agreed in
writing that the improvement or addition in question need not be removed.
Tenant shall repair all damage caused by such removal.  All items not so removed
shall, at Landlord's option, be deemed to have been abandoned by Tenant and may
be appropriated, sold, stored, destroyed, or otherwise disposed of by Landlord
without notice to Tenant and without any obligation to account for such items;
any such disposition shall not be considered a strict foreclosure or other
exercise of Landlord's rights in respect of the security interest granted under
Section 20.  The provisions of this Section 21 shall survive the end of the
Term.

     22.  Holding Over.  If Tenant fails to vacate the Premises at the end of
          ------------
the Term, then Tenant shall be a tenant at sufferance and, in addition to all
other damages and remedies to which Landlord may be entitled for such holding
over, (a) Tenant shall pay for the first 60 days of such holdover period, in
addition to the other Rent, Basic Rent equal to 150% of the Basic Rent payable
during the last month of the Term, and (b) Tenant shall otherwise continue to be
subject to all of Tenant's obligations under this Lease.  The provisions of this
Section 22 shall not be deemed to limit or constitute a waiver of any other
rights or remedies of Landlord provided herein or at law.  If Tenant fails to
surrender the Premises within 30 days following the termination or expiration of
this Lease, in addition to any other liabilities to Landlord accruing therefrom,
Tenant shall protect, defend, indemnify and hold Landlord harmless from all
loss, costs (including reasonable attorneys' fees) and direct liability
resulting from such failure.  If Tenant holds over in the Premises for more than
60 days following the end of the Term, then the holdover rental rate as stated
above shall increase from 150% of the Basic Rent payable during the last month
of the Term to 200% of the Basic Rent payable during the last term of the Term,
and in addition to all the liabilities described above, Tenant shall also be
liable for all liabilities (direct and indirect) resulting from Tenant's failure
to vacate the Premises at the end of the Term, including any claims made by any
succeeding tenant founded upon such failure to surrender, and any lost profits
to Landlord resulting therefrom.

     23.  Certain Rights Reserved by Landlord.  Provided that the exercise of
          -----------------------------------
such rights does not unreasonably interfere with Tenant's occupancy of the
Premises, Landlord shall have the following rights:

          (a)  Building Operations.  To decorate and to make inspections,
               -------------------
repairs, alterations, additions, changes, or improvements, whether structural or
otherwise, in and about the Building, or any part thereof; to enter upon the
Premises (after giving Tenant reasonable notice thereof, which may be oral
notice, except in cases of real or apparent emergency, in which case no notice
shall be required) and, during the continuance of any such work, to temporarily
close doors, entryways, public space, and corridors in the Building; to
interrupt or temporarily suspend Building services and facilities; to change the
name of the Building; and to change the arrangement and location of entrances or
passageways, doors, and doorways, corridors, elevators, stairs, restrooms, or
other public parts of the Building;

          (b)  Security.  To take such reasonable measures as Landlord deems
               --------
advisable for the security of the Building and its occupants; evacuating the
Building for cause, suspected cause, or for drill purposes; temporarily denying
access to the Building; and closing the Building after normal business hours and
on Sundays and holidays, subject, however, to Tenant's right to enter when the
Building is closed after normal business hours under such reasonable regulations
as Landlord may prescribe from time to time;

          (c)  Prospective Purchasers and Lenders.  To enter the Premises at all
               ----------------------------------
reasonable hours to show the Premises to prospective purchasers or lenders; and

                                      20
<PAGE>

          (d)  Prospective Tenants.  At any time during the last nine months of
               -------------------
the Term (or earlier if Tenant has notified Landlord in writing that it does not
desire to renew the Term) or at any time following the occurrence of an Event of
Default, to enter the Premises at all reasonable hours to show the Premises to
prospective tenants.

     Prior to Landlord exercising its rights under Sections 23.(c) and 23.(d),
Landlord shall provide Tenant with reasonable prior notice thereof (which notice
may be verbal) and allow Tenant the opportunity to provide an employee or other
representative of Tenant to accompany Landlord during such entries.

     24.  Substitution Space.  Landlord may, at Landlord's expense, relocate any
          ------------------
part of the Premises consisting of less than 10,000 rentable square feet and any
expansion areas on which tenant has a right to expand (including the Opportunity
Space [as defined below]) within the Building to space which is comparable in
size, utility and condition to the Premises. If Landlord relocates Tenant,
Landlord shall reimburse Tenant for Tenant's reasonable out-of-pocket expenses
for moving Tenant's furniture, equipment, cabling and supplies from the Premises
to the relocation space and for reprinting Tenant's stationery of the same
quality and quantity as Tenant's stationery supply on hand immediately before
Landlord's notice to Tenant of the exercise of this relocation right. Upon such
relocation, the relocation space shall be deemed to be the Premises and the
terms of the Lease shall remain in full force and shall apply to the relocation
space.

     25.  Miscellaneous.
          -------------

          (a)  Landlord Transfer.  Landlord may transfer any portion of the
               -----------------
Building and any of its rights under this Lease.  If Landlord assigns its rights
under this Lease, then Landlord shall thereby be released from any further
obligations hereunder arising after the date of transfer, provided that the
assignee assumes Landlord's obligations hereunder in writing.

          (b)  Landlord's Liability.  The liability of Landlord (and its
               --------------------
partners, shareholders or members) to Tenant (or any person or entity claiming
by, through or under Tenant) for any default by Landlord under the terms of this
Lease or any matter relating to or arising out of the occupancy or use of the
Premises and/or other areas of the Building shall be limited to Tenant's actual
direct, but not consequential, damages therefor and shall be recoverable only
from the interest of Landlord in the Building, and Landlord (and its partners,
shareholders or members) shall not be personally liable for any deficiency.
Additionally, Tenant hereby waives its statutory lien under Section 91.004 of
the Texas Property Code.

          (c)  Force Majeure.  Other than for Tenant's obligations under this
               -------------
Lease that can be performed by the payment of money (e.g., payment of Rent and
maintenance of insurance), whenever a period of time is herein prescribed for
action to be taken by either party hereto, such party shall not be liable or
responsible for, and there shall be excluded from the computation of 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 such party.

          (d)  Brokerage.  Neither Landlord nor Tenant has dealt with any broker
               ---------
or agent in connection with the negotiation or execution of this Lease, other
than Grubb & Ellis Management Services, Inc. and Cushman & Wakefield of Texas,
Inc., whose commissions shall be paid by Landlord pursuant to separate written
agreements.  Tenant and Landlord shall each indemnify the other against all
costs, expenses,

                                      21
<PAGE>

attorneys' fees, liens and other liability for commissions or other compensation
claimed by any broker or agent claiming the same by, through, or under the
indemnifying party.

          (e)  Estoppel Certificates. From time to time, Tenant shall furnish to
               ---------------------
any party designated by Landlord, within ten days after Landlord has made a
request therefor, a certificate signed by Tenant confirming and containing such
factual certifications and representations as to this Lease as Landlord may
reasonably request.  Unless otherwise required by Landlord's Mortgagee or a
prospective purchaser or mortgagee of the Building, the initial form of estoppel
certificate to be signed by Tenant is attached hereto as Exhibit F.
                                                         ---------

          (f)  Notices.  All notices and other communications given pursuant to
               -------
this Lease shall be in writing and shall be (1) mailed by first class, United
States Mail, postage prepaid, certified, with return receipt requested, and
addressed to the parties hereto at the address specified in the Basic Lease
Information, (2) hand delivered to the intended address, (3) sent by a
nationally recognized overnight courier service, or (4) sent by facsimile
transmission during normal business hours followed on the same day by a
confirmatory letter sent in another manner permitted hereunder.  All notices
shall be effective upon delivery to the address of the addressee.  The parties
hereto may change their addresses by giving notice thereof to the other in
conformity with this provision.

          (g)  Separability.  If any clause or provision of this Lease is
               ------------
illegal, invalid, or unenforceable under present or future laws, then the
remainder of this Lease shall not be affected thereby and in lieu of such clause
or provision, there shall be added as a part of this Lease a clause or provision
as similar in terms to such illegal, invalid, or unenforceable clause or
provision as may be possible and be legal, valid, and enforceable.

          (h)  Amendments; Binding Effect.  This Lease may not be amended except
               --------------------------
by instrument in writing signed by Landlord and Tenant.  No provision of this
Lease shall be deemed to have been waived by Landlord unless such waiver is in
writing signed by Landlord, and no custom or practice which may evolve between
the parties in the administration of the terms hereof shall waive or diminish
the right of Landlord to insist upon the performance by Tenant in strict
accordance with the terms hereof.  The terms and conditions contained in this
Lease shall inure to the benefit of and be binding upon the parties hereto, and
upon their respective successors in interest and legal representatives, except
as otherwise herein expressly provided.  This Lease is for the sole benefit of
Landlord and Tenant, and, other than Landlord's Mortgagee, no third party shall
be deemed a third party beneficiary hereof.

          (i)  Quiet Enjoyment.  Provided Tenant has performed all of its
               ---------------
obligations hereunder, Tenant shall peaceably and quietly hold and enjoy the
Premises for the Term, without hindrance from Landlord or any party claiming by,
through, or under Landlord, but not otherwise, subject to the terms and
conditions of this Lease.

          (j)  No Merger.  There shall be no merger of the leasehold estate
               ---------
hereby created with the fee estate in the Premises or any part thereof if the
same person acquires or holds, directly or indirectly, this Lease or any
interest in this Lease and the fee estate in the leasehold Premises or any
interest in such fee estate.

                                      22
<PAGE>

          (k) No Offer.  The submission of this Lease to Tenant shall not be
              --------
construed as an offer, and Tenant shall not have any rights under this Lease
unless Landlord executes a copy of this Lease and delivers it to Tenant.

          (l) Entire Agreement.  This Lease constitutes the entire agreement
              ----------------
between Landlord and Tenant regarding the subject matter hereof and supersedes
all oral statements and prior writings relating thereto.  Except for those set
forth in this Lease, no representations, warranties, or agreements have been
made by Landlord or Tenant to the other with respect to this Lease or the
obligations of Landlord or Tenant in connection therewith.  The normal rule of
construction that any ambiguities be resolved against the drafting party shall
not apply to the interpretation of this Lease or any exhibits or amendments
hereto.

          (m) Waiver of Jury Trial.  To the maximum extent permitted by law,
              --------------------
Landlord and Tenant each waive right to trial by jury in any litigation arising
out of or with respect to this Lease.

          (n) Governing Law.  This Lease shall be governed by and construed in
              -------------
accordance with the laws of the state in which the Premises are located.

          (o) Recording.  Tenant shall not record this Lease or any memorandum
              ---------
of this Lease without the prior written consent of Landlord, which consent may
be withheld or denied in the sole and absolute discretion of Landlord.  Tenant
grants to Landlord a power of attorney to execute and record a release releasing
any such recorded instrument of record that was recorded without the prior
written consent of Landlord.

          (p) Joint and Several Liability.  If Tenant is comprised of more than
              ---------------------------
one party, each such party shall be jointly and severally liable for Tenant's
obligations under this Lease.  All unperformed obligations of Tenant at the end
of the Term shall survive.

          (q) Financial Reports.  Within 15 business days after Landlord's
              -----------------
request, Tenant will furnish Tenant's most recent audited financial statements
(including any notes to them) to Landlord, or, if no such audited statements
have been prepared, such other financial statements (and notes to them) as may
have been prepared by an independent certified public accountant or, failing
those, Tenant's internally prepared financial statements.  If Tenant is a
publicly traded corporation, Tenant may satisfy its obligations hereunder by
providing to Landlord Tenant's most recent annual and quarterly reports.  Tenant
will discuss its financial statements with Landlord and, following the
occurrence of an Event of Default hereunder, will give Landlord access to
Tenant's books and records in order to enable Landlord to verify the financial
statements.  Landlord will not disclose any aspect of Tenant's financial
statements that Tenant designates to Landlord as confidential except (1) to
Landlord's Mortgagee or prospective mortgagees or purchasers of the Building,
(2) in litigation between Landlord and Tenant, and (3) if required by court
order.  Tenant shall not be required to deliver the financial statements
required under this Section 25.(q) more than once in any 12-month period unless
requested by Landlord's Mortgagee or a prospective buyer or lender of the
Building or an Event of Default occurs.

          (r) Landlord's Fees.  Whenever Tenant requests Landlord to take any
              ---------------
action not required of it hereunder or give any consent required or permitted
under this Lease, Tenant will reimburse Landlord for Landlord's reasonable, out-
of-pocket costs payable to third parties and incurred by Landlord in reviewing
the proposed action or consent, including reasonable attorneys', engineers' or
architects' fees, within 30 days after Landlord's delivery to Tenant of an
invoice containing a statement of such costs.  Tenant

                                      23
<PAGE>

will be obligated to make such reimbursement without regard to whether Landlord
consents to any such proposed action.

          (s) Telecommunications.  Tenant and its telecommunications companies,
              ------------------
including local exchange telecommunications companies and alternative access
vendor services companies, shall have no right of access to and within the
Building, for the installation and operation of telecommunications systems,
including voice, video, data, Internet, and any other services provided over
wire, fiber optic, microwave, wireless, and any other transmission systems
("Telecommunications Services"), for part or all of Tenant's telecommunications
-----------------------------
within the Building and from the Building to any other location without
Landlord's prior written consent.  All providers of Telecommunications Services
shall be required to comply with the rules and regulations of the Building,
applicable Laws and Landlord's policies and practices for the Building. Tenant
acknowledges that Landlord shall not be required to provide or arrange for any
Telecommunications Services and that Landlord shall have no liability to any
Tenant Party in connection with the installation, operation or maintenance of
Telecommunications Services or any equipment or facilities relating thereto.
Tenant, at its cost and for its own account, shall be solely responsible for
obtaining all Telecommunications Services.

          (t) Confidentiality.  Both Landlord and Tenant acknowledge that the
              ---------------
terms and conditions of this Lease (other than the existence of this Lease and
the location of the Premises) are to remain confidential for both parties'
benefit, and may not be disclosed by either party to anyone, by any manner or
means, directly or indirectly, without the other party's prior written consent;
however, each party may disclose the terms and conditions of this Lease to their
respective attorneys, accountants, employees and existing or prospective
financial partners and Landlord may also disclose the terms and conditions
hereof to any existing, future or prospective Landlord's Mortgagee, prospective
purchasers of the Building, any necessary governmental agencies (including any
taxing authority), and internal and external auditors.  The consent by either
party to any disclosures shall not be deemed to be a waiver  on the part of such
party of any prohibition against any future disclosure.

          (u) Authority.  Tenant (if a corporation, partnership or other
              ---------
business entity) hereby represents and warrants to Landlord that Tenant is a
duly formed and existing entity qualified to do business in the state in which
the Premises are located, that Tenant has full right and authority to execute
and deliver this Lease, and that each person signing on behalf of Tenant is
authorized to do so.  Landlord hereby represents and warrants to Tenant that
Landlord is a duly formed and existing entity qualified to do business in the
state in which the Premises are located, that Landlord has full right and
authority to execute and deliver this Lease, and that each person signing on
behalf of Landlord is authorized to do so.

          (v) Hazardous Materials.
              -------------------

              (1) The term "Hazardous Materials" means any substance, material,
                            -------------------
     or waste which is now or hereafter classified or considered to be
     hazardous, toxic, or dangerous under any Law relating to pollution or the
     protection or regulation of human health, natural resources or the
     environment, or poses or threatens to pose a hazard to the health or safety
     of persons on the Premises or in the Building. Tenant shall not use,
     generate, store, or dispose of, or permit the use, generation, storage or
     disposal of Hazardous Materials on or about the Premises or the Building
     except in a manner and quantity necessary for the ordinary performance of
     Tenant's business, and then in compliance with all Laws. If Tenant breaches
     its obligations under this Section 25.(v), Landlord may immediately take
     any and all action reasonably appropriate to remedy the same, including
     taking

                                      24
<PAGE>

     all appropriate action to clean up or remediate any contamination resulting
     from Tenant's use, generation, storage or disposal of Hazardous Materials.
     Tenant shall defend, indemnify, and hold harmless Landlord and its
     representatives and agents from and against any and all claims, demands,
     liabilities, causes of action, suits, judgments, damages and expenses
     (including reasonable attorneys' fees and cost of clean up and remediation)
     arising from Tenant's failure to comply with the provisions of this Section
     25.(v). This indemnity provision shall survive termination or expiration of
     this Lease.

          (2) Landlord has provided to Tenant a copy of a Phase I Environmental
     Site Assessment (NOVA Project No. 976135) ("Report") with respect to the
                                                 ------
     Land, dated September 29, 1997, prepared by NOVA Consulting Services, Inc.
     ("Consultant"). Tenant agrees not to release the Report, or a copy of it,
       ----------
     or any part of it, or disclose any of the information contained in the
     Report to any third party (other than Tenant's counsel) without the express
     prior written consent of Landlord. Such consent shall not be unreasonably
     withheld as long as the proposed party to whom the report is given executes
     a letter agreement containing covenants similar to this Section 25.(v).
     Tenant releases Landlord for any inaccuracies, omissions, or errors
     contained in the Report. Tenant agrees that it will not rely on the Report
     and it will make whatever independent investigation it feels is necessary
     to investigate the environmental and other conditions of the Land. Tenant
     agrees that Landlord has no duty to provide it with the Report, to correct
     any inaccuracies, errors, or omission in the Report, to supplement the
     Report with any additional information, or to provide Tenant with any
     information concerning the environmental conditions of the Land. Tenant
     agrees that Landlord considers the Report to be confidential proprietary
     information and Tenant agrees to maintain the confidentiality and security
     of the Report information in accordance with the highest standards of
     confidentiality and security associated with the protection of "trade
     secrets." Landlord hereby expressly disclaims responsibility for the
     investigation of the Land by Tenant and further disclaims any
     responsibility for the contents of the Report. Tenant's obligations
     pursuant to this Section 25.(v) shall survive the expiration or termination
     of this Lease.

          (3) Landlord represents and warrants to Tenant that to the best of
     Landlord' s actual knowledge (not constructive), without any duty of
     inquiry, Landlord has not received written notice of any Hazardous
     Materials on the Land or the Premises in violation of any environmental
     Law. Landlord and Tenant each specifically acknowledge and agree that all
     references in this Lease to the phrase "to the best of Landlord's actual
     knowledge" (or other similar phrase) (1) shall mean the actual (not
     constructive) personal knowledge of Landlord' s individual asset manager,
     Paul Garancis ("Landlord's Personnel"); (2) shall in no case mean or refer
                     --------------------
     to the actual or constructive knowledge of any other employee, trustee,
     partner, agent or partner of a partner, officer, director or other
     representative of Landlord or any investment advisor, attorney, contractor
     or representative of Landlord (together with Landlord's Personnel,
     "Landlord's Representatives"); and (3) shall in no event or circumstance
      --------------------------
     impose upon Landlord or any of Landlord's Representatives any duty or
     obligation to verify, inquire or make any independent inquiry or
     investigation of any such representation, warranty or statement, or to
     otherwise investigate the facts or circumstances relating or otherwise
     pertinent thereto. Tenant further acknowledges and agrees that none of
     Landlord's Representatives shall be personally liable, or otherwise have
     any personal liability, under or in connection with this Lease, including
     without limitation, in connection with any of the representations,
     warranties or statements made in connection with, or pursuant to, this
     Lease.

                                      25
<PAGE>

          (w) List of Exhibits.  All exhibits and attachments attached hereto
              ----------------
are incorporated herein by this reference.

          Exhibit A-1 -  Outline of Premises
          Exhibit A-2 -  Outline of Opportunity Space
          Exhibit B -    Description of the Land
          Exhibit C -    Building Rules and Regulations
          Exhibit D -    Tenant Finish-Work:  Allowance
          Exhibit E -    Form of Confirmation of Commencement Date Letter
          Exhibit F -    Form of Tenant Estoppel Certificate
          Exhibit G -    Parking
          Exhibit H -    Renewal Option
          Exhibit I -    Right of First Opportunity
          Exhibit J -    Form of Letter of Credit
          Exhibit K -    Janitorial Specifications
          Exhibit L -    Form of Subordination, Non-Disturbance and Attornment
                         Agreement

     26.  Other Provisions.
          ----------------

          (a) Attorneys' Fees.  If there is any legal or arbitration action or
              ---------------
proceeding between Landlord and Tenant to enforce any provision of this Lease or
to protect or establish any right or remedy of either Landlord or Tenant
hereunder, the unsuccessful party to such action or proceeding will pay to the
prevailing party all reasonable, actual out-of-pocket costs and expenses paid or
payable to third parties, including reasonable attorneys' fees incurred by such
prevailing party in such action or proceeding and in any appeal in connection
therewith, and if such prevailing party recovers a judgment in any such action,
proceeding or appeal, such costs, expenses and attorneys' fees will be
determined by the court or arbitration panel handling the proceeding and will be
included in and as a part of such judgment.

          (b) Signage.  Following the leasing by Tenant of at least two full
              -------
floors in the Building and subject to (1) the rights of other tenants in the
Building and (2) Landlord's prior approval of the location, design, size, color,
material composition, and plans and specifications therefor, Tenant may, at its
sole risk and expense, install Tenant's trade name (the "Sign") on the black
                                                         ----
marble retaining wall adjacent to the main entrance of the Building.  If
Landlord grants its approval, Tenant shall erect the Sign in accordance with the
approved plans and specifications, in a good and workmanlike manner, in
accordance with all laws, regulations, restrictions (governmental or otherwise),
and architectural guidelines in effect for the area in which the Building is
located (including the Las Colinas Association) and has received all requisite
approvals thereunder (the "Sign Requirements"), and in a manner so as not to
                           -----------------
unreasonably interfere with the use of the Building grounds while such
construction is taking place; thereafter, Tenant shall maintain the Sign in a
good, clean, and safe condition in accordance with the Sign Requirements.  After
the end of the Term or after Tenant's right to possess the Premises has been
terminated, Landlord (A) may require that Tenant remove the Sign by delivering
to Tenant written notice thereof within 30 days after the end of the Term or (B)
may use the Sign, in which case the Sign shall become the property of Landlord
without compensation to Tenant.  If Landlord so requests, Tenant shall remove
the Sign, repair all damage caused thereby, and restore the black marble
retaining wall to its condition before the installation of the Sign within ten
business days after Landlord's request therefor.  If Tenant fails to timely do
so, Landlord may, without compensation to Tenant, (i) use the Sign or (ii) at
Tenant's expense, remove the Sign, perform the related restoration and repair
work and dispose of the Sign in any manner Landlord deems appropriate.
Notwithstanding

                                      26
<PAGE>

Landlord's indemnification contained in Section 11.(d), it is the intention of
the parties that Tenant bear all risks relating to the installation, use,
maintenance, operation, and removal of the Sign; therefore, Tenant shall defend,
indemnify, and hold harmless Landlord, its agents, and their respective
affiliates from all losses, claims, costs, and liabilities arising in connection
with or relating to the installation, maintenance, use, operation, and removal
of the Sign, including, without limitation, that arising from Landlord's
negligence (other than its sole or gross negligence). The rights granted to
Tenant under this Section 26.(b) are personal to Tenfold Corporation, may not be
assigned to any party, and may be revoked by Landlord if Tenant ceases to lease
at least two full floors in the Building or if Tenant ceases to occupy a portion
of the Premises.

           [THE REMAINDER OF THIS PAGE IS INTENTIONALLY LEFT BLANK]

                                      27
<PAGE>

LANDLORD AND TENANT EXPRESSLY DISCLAIM ANY IMPLIED WARRANTY THAT THE PREMISES
ARE SUITABLE FOR TENANT'S INTENDED COMMERCIAL PURPOSE, AND TENANT'S OBLIGATION
TO PAY RENT HEREUNDER IS NOT DEPENDENT UPON THE CONDITION OF THE PREMISES OR THE
PERFORMANCE BY LANDLORD OF ITS OBLIGATIONS HEREUNDER, AND, EXCEPT AS OTHERWISE
EXPRESSLY PROVIDED HEREIN, TENANT SHALL CONTINUE TO PAY THE RENT, WITHOUT
ABATEMENT, DEMAND, SETOFF OR DEDUCTION, NOTWITHSTANDING ANY BREACH BY LANDLORD
OF ITS DUTIES OR OBLIGATIONS HEREUNDER, WHETHER EXPRESS OR IMPLIED.

     Dated as of the date first above written.

LANDLORD:                     W9/CGN REAL ESTATE LIMITED PARTNERSHIP,
                              a Delaware limited partnership
                              By: W9/CGN Gen-Par, Inc., a Delaware corporation,
                                  its general partner

                                  By: /s/ William G. Mundinger II
                                     ----------------------------------------
                                  Name:  William G. Mundinger II
                                       --------------------------------------
                                  Title: Assistant Vice President
                                        -------------------------------------

TENANT:                       TENFOLD CORPORATION, a Delaware corporation

                              By: /s/ Robert P. Hughes
                                 --------------------------------------------
                              Name:  Robert P. Hughes
                                   ------------------------------------------
                              Title: Chief Financial Officer
                                    -----------------------------------------

                                      28
<PAGE>

                                  EXHIBIT A-1
                                  -----------

                              OUTLINE OF PREMISES
                              -------------------

                                     A-1-1
<PAGE>

                                  EXHIBIT A-2
                                  -----------

                         OUTLINE OF OPPORTUNITY SPACE
                         ----------------------------

                                     A-2-1
<PAGE>

                                   EXHIBIT B
                                   ---------

                            DESCRIPTION OF THE LAND
                            -----------------------

     Being a 4.982 acre tract of land situated in the S.A. & M.G.R.R. Survey,
     Abstract No. 1452, Dallas County, Texas, said 4.982 acre tract being all of
     Lot 1, Block A, Las Colinas Urban Center, Nineteenth Installment Revised,
     an addition to the City of Irving, Dallas County, Texas as recorded in
     Volume 88192, Page 2950, Plat Records, Dallas County, Texas, said 4.982
     acre tract being more particularly described as follows:

     BEGINNING at a set point on a corner cutoff line of the northeasterly
     right-of-way line on El Lago Boulevard (110' R.O.W.), said iron pin being
     the most easterly southeast corner of said El Lago Boulevard as recorded in
     Volume 80246, Page 2835, Deed Records of Dallas County, Texas;

     THENCE N 55 degrees 44'02" W, 60.66 feet along a corner cutoff line of said
     ------
     El Lago Boulevard to a set 'x' in concrete for an angle point;

     THENCE N 15 degrees 02'47" W, a distance of 385.46 feet along said
     ------
     northeasterly line to a set 'x' in concrete for an angle point;

     THENCE N 29 degrees 57'13" E, a distance of 56.57 feet along a corner
     ------
     cutoff line to a set 'x' in concrete for an angle point on the southerly
     right-of-way line of Las Colinas Boulevard (1100 R.O.W.);

     THENCE easterly along said southerly line of Las Colinas Boulevard as
     ------
     follows:

          N 74 degrees 57'13" E, a distance of 20.00 feet to a set 'x' in
          concrete for the beginning of a curve to the right having a central
          angle of 18 degree 50'41" and a radius of 765.51 feet and a chord
          bearing and distance of N 84 degrees 22'33" E, 251.63 feet;

          Easterly an arc distance of 252.76 feet to a set 'x' in concrete for
          an angle point said point being the common line of said Lot 1 and Lot
          2, Block A, Las Colinas Urban Center, Nineteenth Installment Revised,
          an addition to the City of Irving as recorded in Volume 88192, Page
          2950, Plat Records, Dallas County, Texas;

     THENCE continuing along said common line S 69E0401800 E, a distance of 5.49
     ------
     feet departing said southerly line of Las Colinas Boulevard to a set 'x' in
     concrete for corner, said 'x' being the beginning of a nontangent curve to
     the right having a central angle of 26 degrees 25'51", a radius of 265.00
     feet, and a long chord bearing of S 49 degrees 22'45" E, for a distance of
     121.17 feet;

     THENCE continuing along said common line southeasterly an arc distance of
     ------
     122.25 feet to a set 'x' in concrete, said 'x' being the beginning of a
     nontangent curve to the left having

                                      B-1
<PAGE>

     a central angle of 138 degrees 48' 01" and a radius of 61.30 feet and a
     long cord bearing and distance of N 62 degrees 22'18" W, 114.76 feet;

     THENCE continuing along said common line along said curve an arc distance
     ------
     of 148.50 feet to a set 'x' in concrete, said 'x' being the end of said
     curve;

     THENCE continuing along said common line, S 15 degrees 05'46" E, a portion
     ------
     of said line lying along the easterly face of a multi-story parking garage,
     a distance of 381.02 feet, to a set iron pin on the northerly right-of-way
     line of Rochelle Boulevard (110' R.O.W.);

     THENCE departing said common line westerly along said northerly line of
     ------
     said Rochelle Boulevard as follows:

          Westerly along a curve to the right having a central angle of 06
          degrees 08'07" and a radius of 1206.13 feet, and a long chord bearing
          and a distance of N 88 degrees 45'05" W, 129.09 feet, an arc being the
          end of said curve;

          N 85 degrees 41'02" W, a distance of 192.92 feet to a set iron pin,
          said iron pin being the beginning of a curve to the left having a
          central angle 9E1501500 and a radius of 771.20 feet and a long chord
          bearing and distance of S 89 degrees 41'16" W, 124.45 feet;

          Westerly, an arc distance of 124.60 feet to the POINT OF BEGINNING and
                                                          ------------------
          CONTAINING 4.982 acres of 217,008 square feet of land.
          ----------

                                      B-2
<PAGE>

                                   EXHIBIT C
                                   ---------

                        BUILDING RULES AND REGULATIONS
                        ------------------------------

     The following rules and regulations shall apply to the Premises, the
Building, the parking garage associated therewith, and the appurtenances
thereto:

     1.   Sidewalks, doorways, vestibules, halls, stairways, and other similar
areas shall not be obstructed by tenants or used by any tenant for purposes
other than ingress and egress to and from their respective leased premises and
for going from one to another part of the Building.

     2.   Plumbing, fixtures and appliances shall be used only for the purposes
for which designed, and no sweepings, rubbish, rags or other unsuitable material
shall be thrown or deposited therein.  Damage resulting to any such fixtures or
appliances from misuse by a tenant or its agents, employees or invitees, shall
be paid by such tenant.

     3.   No signs, advertisements or notices shall be painted or affixed on or
to any windows or doors or other part of the Building without the prior written
consent of Landlord. No nails, hooks or screws (other than those which are
necessary to hang paintings, prints, pictures, or other similar items on the
Premises' interior walls) shall be driven or inserted in any part of the
Building except by Building maintenance personnel. No curtains or other window
treatments shall be placed between the glass and the Building standard window
treatments.

     4.   Landlord shall provide and maintain an alphabetical directory for all
tenants in the main lobby of the Building.

     5.   Landlord shall provide all door locks in each tenant's leased
premises, at the cost of such tenant, and no tenant shall place any additional
door locks in its leased premises without Landlord's prior written consent.
Landlord shall furnish to each tenant a reasonable number of keys to such
tenant's leased premises, at such tenant's cost, and no tenant shall make a
duplicate thereof.

     6.   Movement in or out of the Building of furniture or office equipment,
or dispatch or receipt by tenants of any bulky material, merchandise or
materials which require use of elevators or stairways, or movement through the
Building entrances or lobby shall be conducted under Landlord's supervision at
such times and in such a manner as Landlord may reasonably require.  Each tenant
assumes all risks of and shall be liable for all damage to articles moved and
injury to persons or public engaged or not engaged in such movement, including
equipment, property and personnel of Landlord if damaged or injured as a result
of acts in connection with carrying out this service for such tenant.

     7.   Landlord may prescribe weight limitations and determine the locations
for safes and other heavy equipment or items, which shall in all cases be placed
in the Building so as to distribute weight in a manner acceptable to Landlord
which may include the use of such supporting devices as Landlord may require.
All damages to the Building caused by the installation or removal of any
property of a tenant, or done by a tenant's property while in the Building,
shall be repaired at the expense of such tenant.

                                      C-1
<PAGE>

     8.   Corridor doors, when not in use, shall be kept closed.  Nothing shall
be swept or thrown into the corridors, halls, elevator shafts or stairways.  No
birds or animals (other than seeing-eye dogs) shall be brought into or kept in,
on or about any tenant's leased premises. No portion of any tenant's leased
premises shall at any time be used or occupied as sleeping or lodging quarters.

     9.   Tenant shall cooperate with Landlord's employees in keeping its leased
premises neat and clean. Tenants shall not employ any person for the purpose of
such cleaning other than the Building's cleaning and maintenance personnel.

     10.  To ensure orderly operation of the Building, no ice, mineral or other
water, towels, newspapers, etc. shall be delivered to any leased area except by
persons approved by Landlord, which approval shall not be unreasonably withheld.

     11.  Tenant shall not make or permit any vibration or improper,
objectionable or unpleasant noises or odors in the Building or otherwise
interfere in any way with other tenants or persons having business with them.

     12.  No machinery of any kind (other than normal office equipment) shall be
operated by any tenant on its leased area without Landlord's prior written
consent, nor shall any tenant use or keep in the Building any flammable or
explosive fluid or substance (other than typical office supplies [e.g.,
photocopier toner] used in compliance with all Laws).

     13.  Landlord will not be responsible for lost or stolen personal property,
money or jewelry from tenant's leased premises or public or common areas
regardless of whether such loss occurs when the area is locked against entry or
not.

     14.  No vending or dispensing machines of any kind may be maintained in any
leased premises without the prior written permission of Landlord, which approval
shall not be unreasonably withheld.

     15.  Tenant shall not conduct any activity on or about the Premises or
Building which will draw pickets, demonstrators, or the like.

     16.  All vehicles are to be currently licensed, in good operating
condition, parked for business purposes having to do with Tenant's business
operated in the Premises, parked within designated parking spaces, one vehicle
to each space. No vehicle shall be parked as a "billboard" vehicle in the
parking lot. Any vehicle parked improperly may be towed away. Tenant, Tenant's
agents, employees, vendors and customers who do not operate or park their
vehicles as required shall subject the vehicle to being towed at the expense of
the owner or driver. Landlord may place a "boot" on the vehicle to immobilize it
and may levy a charge of $50.00 to remove the "boot." Tenant shall indemnify,
hold and save harmless Landlord of any liability arising from the towing or
booting of any vehicles belonging to a Tenant Party.

     17.  No tenant may enter into phone rooms, electrical rooms, mechanical
rooms, or other service areas of the Building unless accompanied by Landlord or
the Building manager.

                                      C-2
<PAGE>

                                   EXHIBIT D
                                   ---------

                         TENANT FINISH-WORK: ALLOWANCE
                         -----------------------------
                         (Landlord Performs the Work)

     1.   Acceptance of Premises.  Except as set forth in this Exhibit, Tenant
          ----------------------
accepts the Premises in their "AS-IS" condition on the date that this Lease is
                               -----
entered into.  Notwithstanding the foregoing, Landlord, shall, at its expense,
make such alterations to ensure that the drinking fountains currently located in
the Premises comply with the Americans With Disabilities Act.

     2.   Space Plans.
          -----------

          (a)  Preparation and Delivery.  Landlord and Tenant hereby approve the
               ------------------------
space plans dated December 23, 1999, prepared by da&a architects (the
"Architect") depicting improvements to be installed in the Premises (the "Space
 ---------                                                                -----
Plans").
-----

          (b)  Approval Process.  [Intentionally deleted.]
               ----------------

     3.   Working Drawings.
          ----------------

          (a)  Preparation and Delivery.  On or before February 4, 2000 (the
               ------------------------
"Working Drawings Delivery Deadline"), Tenant shall provide to Landlord for its
 ----------------------------------
approval final working drawings, prepared by the Architect, of all improvements
that Tenant proposes to install in the Premises; such working drawings shall
include the partition layout, ceiling plan, electrical outlets and switches,
telephone outlets, drawings for any modifications to the mechanical and plumbing
systems of the Building, and detailed plans and specifications for the
construction of the improvements called for under this Exhibit in accordance
with all applicable Laws. If Tenant fails to timely deliver such drawings, then
each day after the Working Drawings Delivery Deadline that such drawings are not
delivered to Landlord shall be a Tenant Delay Day.

          (b)  Approval Process. Landlord shall notify Tenant whether it
               ----------------
approves of the submitted working drawings within five business days after
Tenant's submission thereof. If Landlord disapproves of such working drawings,
then Landlord shall notify Tenant thereof specifying in reasonable detail the
reasons for such disapproval, in which case Tenant shall, within five business
days after such notice, revise such working drawings in accordance with
Landlord's objections and submit the revised working drawings to Landlord for
its review and approval. Landlord shall notify Tenant in writing whether it
approves of the resubmitted working drawings within three business days after
its receipt thereof. This process shall be repeated until the working drawings
have been finally approved by Tenant and Landlord. If Landlord fails to notify
Tenant that it disapproves of the initial working drawings within five business
days (or, in the case of resubmitted working drawings, within three business
days) after the submission thereof, then Landlord shall be deemed to have
approved the working drawings in question. If the working drawings are not fully
approved (or deemed approved) by both Landlord and Tenant by the 15th business
day after the delivery of the initial draft thereof to Landlord, then each day
after such time period that such working drawings are not fully approved (or
deemed approved) by both Landlord and Tenant shall constitute a Tenant Delay
Day.

                                      D-1
<PAGE>

          (c)  Landlord's Approval; Performance of Work.  If any of Tenant's
               ----------------------------------------
proposed construction work will affect the Building's Structure or the
Building's Systems, then the working drawings pertaining thereto must be
approved by the Building's engineer of record.  Landlord's approval of such
working drawings shall not be unreasonably withheld, provided that (1) they
comply with all Laws, (2) the improvements depicted thereon do not adversely
affect (in the reasonable discretion of Landlord) the Building's Structure or
the Building's Systems (including the Building's restrooms or mechanical rooms),
the exterior appearance of the Building, or the appearance of the Building's
common areas or elevator lobby areas, (3) such working drawings are sufficiently
detailed to allow construction of the improvements in a good and workmanlike
manner, and (4) the improvements depicted thereon conform to the rules and
regulations promulgated from time to time by Landlord for the construction of
tenant improvements (a copy of which has been delivered to Tenant).  As used
herein, "Working Drawings" shall mean the final working drawings approved by
         ----------------
Landlord, as amended from time to time by any approved changes thereto, and
"Work" shall mean all improvements to be constructed in accordance with and as
 ----
indicated on the Working Drawings, together with any work required by
governmental authorities to be made to other areas of the Building as a result
of the improvements indicated by the Working Drawings. Landlord's approval of
the Working Drawings shall not be a representation or warranty of Landlord that
such drawings are adequate for any use or comply with any Law, but shall merely
be the consent of Landlord thereto. Tenant shall, at Landlord's request, sign
the Working Drawings to evidence its review and approval thereof. After the
Working Drawings have been approved, Landlord shall cause the Work to be
performed in substantial accordance with the Working Drawings.

     4.   Bidding of Work.  Constructors & Associates, Inc. of Dallas, Texas, is
          ---------------
hereby deemed approved by Landlord. If Tenant elects to use a general contractor
other than Constructors & Associates, Inc., prior to commencing the Work,
Landlord shall competitively bid the Work to three contractors approved by
Landlord. If the estimated Total Construction Costs are expected to exceed the
Construction Allowance, Tenant shall be allowed to review the submitted bids
from such contractors to value engineer any of Tenant's requested alterations.
In such case, Tenant shall notify Landlord of any items in the Working Drawings
that Tenant desires to change within two business days after Landlord's
submission thereof to Tenant. If Tenant fails to notify Landlord of its election
within such two business day period, Tenant shall be deemed to have approved the
bids. Within five business days following Landlord's submission to Tenant of the
initial construction bids to Tenant under the foregoing provisions (if
applicable), Tenant shall have completed all of the following items: (a)
finalized with Landlord's representative and the proposed contractor, the
pricing of any requested revisions to the bids for the Work, and (b) approved in
writing any overage in the Total Construction Costs in excess of the
Construction Allowance, failing which each day after such five business day
period shall constitute a Tenant Delay Day.

     5.   Change Orders.  Tenant may initiate changes in the Work.  Each such
          -------------
change must receive the prior written approval of Landlord, such approval not to
be unreasonably withheld or delayed; however, (a) if such requested change would
adversely affect (in the reasonable discretion of Landlord) (1) the Building's
Structure or the Building's Systems (including the Building's restrooms or
mechanical rooms), (2) the exterior appearance of the Building, or (3) the
appearance of the Building's common areas or elevator lobby areas, or (b) if any
such requested change might delay the Commencement Date, Landlord may withhold
its consent in its sole and absolute discretion.  Tenant shall, upon completion
of the Work, furnish Landlord with an accurate architectural "as-built" plan of
the Work as constructed, which plan shall be incorporated into this Exhibit D by
                                                                    ---------
this reference for all purposes. If Tenant requests any changes to the Work
described in the Space Plans or the Working Drawings, then such increased costs
and any additional

                                      D-2
<PAGE>

design costs incurred in connection therewith as the result of any such change
shall be added to the Total Construction Costs.

     6.   Definitions.  As used herein, a "Tenant Delay Day" shall mean each
          -----------                      ----------------
day of delay in the performance of the Work that occurs (a) because of Tenant's
failure to timely deliver or approve any required documentation such as the
Space Plans or Working Drawings, (b) because of any change by Tenant to the
Space Plans or Working Drawings, (c) because of any specification by Tenant of
materials or installations in addition to or other than Landlord's standard
finish-out materials, or (d) because a Tenant Party otherwise delays completion
of the Work.  As used herein "Substantial Completion," "Substantially
                              ----------------------    -------------
Completed," and any derivations thereof mean (1) the Work in the Premises is
---------
substantially completed (as reasonably determined by Landlord) in substantial
accordance with the Working Drawings and (2) the applicable municipality has
issued and Tenant has received authorization from the City of Irving (as
evidenced by the issuance of so-called "green tag") to occupy the Premises.
Substantial Completion shall have occurred even though minor details of
construction, decoration, landscaping and mechanical adjustments remain to be
completed by Landlord.

     7.   Walk-Through; Punchlist.  When Landlord considers the Work in the
          -----------------------
Premises to be Substantially Completed, Landlord will notify Tenant and within
three business days thereafter, Landlord's representative and Tenant's
representative shall conduct a walk-through of the Premises and identify any
necessary touch-up work, repairs and minor completion items that are necessary
for final completion of the Work. Neither Landlord's representative nor Tenant's
representative shall unreasonably withhold his or her agreement on punchlist
items. Landlord shall use reasonable efforts to cause the contractor performing
the Work to complete all punchlist items within 30 days after agreement thereon;
however, Landlord shall not be obligated to engage overtime labor in order to
complete such items.

     8.   Excess Costs.  The entire cost of performing the Work (including
          ------------
design of the Work and preparation of the Working Drawings, costs of
construction labor and materials, additional janitorial services, general tenant
signage, related taxes and insurance costs, and the construction supervision fee
referenced in Section 10 of this Exhibit, all of which costs are herein
collectively called the "Total Construction Costs") in excess of the
                         ------------------------
Construction Allowance (hereinafter defined) shall be paid by Tenant. Upon
approval of the Working Drawings and selection of a contractor, Tenant shall
promptly (a) execute a work order agreement prepared by Landlord which
identifies such drawings and itemizes the Total Construction Costs and sets
forth the Construction Allowance, and (b) pay to Landlord 50% of the amount by
which Total Construction Costs exceed the Construction Allowance. Upon
Substantial Completion of the Work and before Tenant occupies the Premises to
conduct business therein, Tenant shall pay to Landlord an amount equal to the
Total Construction Costs (as adjusted for any approved changes to the Work),
less (1) the amount of the advance payment already made by Tenant, and (2) the
amount of the Construction Allowance. In the event of default of payment of such
excess costs, Landlord (in addition to all other remedies) shall have the same
rights as for an Event of Default under the Lease.

     9.   Construction Allowance.  Landlord shall provide to Tenant a
          ----------------------
construction allowance not to exceed $18.00 per rentable square foot in the
Premises (the "Construction Allowance") to be applied toward the Total
               ----------------------
Construction Costs, as adjusted for any changes to the Work. The Construction
Allowance shall not be disbursed to Tenant in cash, but shall be applied by
Landlord to the payment of the Total Construction Costs, if, as, and when the
cost of the Work is actually incurred and paid by Landlord. The Construction
Allowance must be used within six months following the Commencement Date or
shall be deemed forfeited with no further obligation by Landlord with respect
thereto. From the Construction

                                      D-3
<PAGE>

Allowance, Tenant may apply up to $1.00 per rentable square foot in the Premises
of such allowance to pay for the costs of Tenant's architectural and MEP fees.

     10.  Construction Management.  Landlord or its Affiliate or agent shall
          -----------------------
supervise the Work, make disbursements required to be made to the contractor,
and act as a liaison between the contractor and Tenant and coordinate the
relationship between the Work, the Building and the Building's Systems. In
consideration for Landlord's construction supervision services, Tenant shall pay
to Landlord a construction supervision fee equal to four percent of the Total
Construction Costs.

     11.  Construction Warranty.  As part of the construction contract with
          ---------------------
general contractor performing the Work in the Premises, Landlord shall obtain a
one-year construction warranty with respect to the Work therein, beginning on
the date of Substantial Completion (such time period is referred to herein as
the "Warranty Period"). During the Warranty Period, if Tenant notifies Landlord
     ---------------
of any defect in the workmanship or construction of the Work, then Landlord
shall enforce such construction warranty against the general contractor on
Tenant's behalf. Such construction warranty shall expire and be of no further
force or effect (and neither the general contractor nor Landlord shall have any
obligation of repair relative thereto), for any defect with respect to the Work
that Tenant fails to make a written claim to Landlord relative to such defect on
or before the expiration of the Warranty Period. Notwithstanding the foregoing,
in no event shall Landlord or the general contractor have any liability for any
defects in the Work caused by any deficiencies in the Working Drawings, and,
with respect to any such defects, Tenant shall rely solely on any warranties it
separately obtains from its Architect.

     12.  Early Entry by Tenant.  Tenant may enter the Premises before the
          ---------------------
Premises are in a substantially completed condition with Landlord's prior
consent (which shall not be unreasonably withheld) to perform work therein
(including data cabling, telephone and data equipment, security, audio/visual
equipment, white noise, and furniture systems), provided that (a) Landlord is
given prior written notice of any such entry, (b) such entry shall be
coordinated with Landlord and shall not interfere with Landlord's work, and (c)
Tenant shall deliver to Landlord evidence that the insurance required under
Section 11.(a) of this Lease has been obtained. Any such entry shall be on the
terms of this Lease, but no rent shall accrue in respect of Basic Rent or
Operating Costs, during the period that Tenant so enters the Premises prior to
the Commencement Date. Tenant shall conduct its activities therein so as not to
interfere with Landlord's construction activities, and shall do so at its risk
and expense. If, in Landlord's judgment, Tenant's activities therein interfere
with Landlord's construction activities, Landlord may terminate Tenant's right
to enter the Premises before the Commencement Date.

     13.  Construction Representatives.  Landlord's and Tenant's representatives
          ----------------------------
for coordination of construction and approval of change orders will be as
follows, provided that either party may change its representative upon written
notice to the other:

     Landlord's Representative:      Kathy Boop
                                     c/o Grubb & Ellis Management Services, Inc.
                                     14785 Preston Road, Suite 1000
                                     Dallas, Texas 75240
                                     Telephone: 972-450-3300
                                     Telecopy: 972-450-3239

                                      D-4
<PAGE>

     Tenant's Representative:        Gina Katigbak
                                     c/o Tenfold Corporation
                                     100 Foster City Boulevard
                                     Suite 200
                                     Foster City, California  94404
                                     Telephone: 650-570-5711
                                     Telecopy: 650-570-5988

     14.  Miscellaneous.  To the extent not inconsistent with this Exhibit,
          -------------
Sections 8.(a) and 21 of this Lease shall govern the performance of the Work and
Landlord's and Tenant's respective rights and obligations regarding the
improvements installed pursuant thereto.

                                      D-5
<PAGE>

                                   EXHIBIT E
                                   ---------

                       CONFIRMATION OF COMMENCEMENT DATE
                       ---------------------------------

                             ______________, 2000

Tenfold Corporation

__________________________
__________________________
__________________________

     Re:  Lease Agreement (the "Lease") dated February 4, 2000, between W9/CGN
                                -----
          Real Estate Limited Partnership, a Delaware limited partnership
          ("Landlord"), and Tenfold Corporation, a Delaware corporation
            --------
          ("Tenant"). Capitalized terms used herein but not defined shall be
            ------
          given the meanings assigned to them in the Lease.

Ladies and Gentlemen:

     Landlord and Tenant agree as follows:

     1.   Condition of Premises.  Tenant has accepted possession of the Premises
          ---------------------
pursuant to the Lease. Any improvements required by the terms of the Lease to be
made by Landlord have been completed to the full and complete satisfaction of
Tenant in all respects except for the punchlist items described on Exhibit A
                                                                   ---------
hereto (the "Punchlist Items"), and except for such Punchlist Items, Landlord
             ---------------
has fulfilled all of its duties under the Lease with respect to such initial
tenant improvements. Furthermore, Tenant acknowledges that the Premises are
suitable for the Permitted Use.

     2.   Commencement Date.  The Commencement Date of the Lease is __________,
          -----------------
2000.

     3.   Expiration Date.  The Term is scheduled to expire on the last day of
          ---------------
the 60th full calendar month of the Term, which date is ______________, 2005.

     4.   Contact Person.  Tenant's contact person in the Premises is:
          --------------

          Tenfold Corporation
          600 Las Colinas Boulevard, Suite 600
          Irving, Texas 75039
          Attention: ____________________
          Telephone:  ____- ___-_____
          Telecopy:  ____- ___-_____

     5.   Ratification.  Tenant hereby ratifies and confirms its obligations
          ------------
under the Lease, and represents and warrants to Landlord that it has no defenses
thereto.  Additionally, Tenant further confirms and ratifies that, as of the
date hereof, (a) the Lease is and remains in good standing and in full force and

                                      E-1
<PAGE>

effect, and (b) Tenant has no claims, counterclaims, set-offs or defenses
against Landlord arising out of the Lease or in any way relating thereto or
arising out of any other transaction between Landlord and Tenant.

     6.   Binding Effect; Governing Law.  Except as modified hereby, the Lease
          -----------------------------
shall remain in full effect and this letter shall be binding upon Landlord and
Tenant and their respective successors and assigns. If any inconsistency exists
or arises between the terms of this letter and the terms of the Lease, the terms
of this letter shall prevail.  This letter shall be governed by the laws of the
state in which the Premises are located.

     Please indicate your agreement to the above matters by signing this letter
in the space indicated below and returning an executed original to us.

                                        Sincerely,

                                        GRUBB & ELLIS MANAGEMENT SERVICES, INC.

                                        By:_____________________________________
                                        Name:___________________________________
                                        Title:__________________________________

Agreed and accepted:

TENFOLD CORPORATION, a Delaware corporation

By:________________________________
Name:______________________________
Title:_____________________________

                                      E-2
<PAGE>

                                   EXHIBIT A
                                   ---------

                                PUNCHLIST ITEMS
                                ---------------

Please insert any punchlist items that remain to be performed by Landlord. If no
items are listed below by Tenant, none shall be deemed to exist.

                                      E-3
<PAGE>

                                   EXHIBIT F
                                   ---------

                      FORM OF TENANT ESTOPPEL CERTIFICATE
                      -----------------------------------

     The undersigned is the Tenant under the Lease (defined below) between
_______________________, a ___________________, as Landlord, and the undersigned
as Tenant, for the Premises on the __________ floor(s) of the office building
located at _____________________, __________ and commonly known as
_______________________, and hereby certifies as follows:

     1.   The Lease consists of the original Lease Agreement dated as of
___________, 2000, between Tenant and Landlord ['s predecessor-in-interest] and
the following amendments or modifications thereto (if none, please state
"none"):________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________

The documents listed above are herein collectively referred to as the "Lease"
                                                                       -----
and represent the entire agreement between the parties with respect to the
Premises. All capitalized terms used herein but not defined shall be given the
meaning assigned to them in the Lease.

     2.   The Lease is in full force and effect and has not been modified,
supplemented or amended in any way except as provided in Section 1 above.

     3.   The Term commenced on __________________, 200__, and the Term expires,
excluding any renewal options, on _____________________, 200__, and Tenant has
no option to purchase all or any part of the Premises or the Building or, except
as expressly set forth in the Lease, any option to terminate or cancel the
Lease.

     4.   Tenant currently occupies the Premises described in the Lease and
Tenant has not transferred, assigned, or sublet any portion of the Premises nor
entered into any license or concession agreements with respect thereto except as
follows (if none, please state "none"):_________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________

     5.   All monthly installments of Basic Rent, all Additional Rent and all
monthly installments of estimated Additional Rent have been paid when due
through _____________. The current monthly installment of Basic Rent is
$__________.

     6.   All conditions of the Lease to be performed by Landlord necessary to
the enforceability of the Lease have been satisfied and Landlord is not in
default thereunder. In addition, Tenant has not delivered any notice to Landlord
regarding a default by Landlord thereunder.

     7.   As of the date hereof, there are no existing defenses or offsets, or,
to the undersigned's knowledge, claims or any basis for a claim, that the
undersigned has against Landlord and no event has

                                      F-1
<PAGE>

occurred and no condition exists, which, with the giving of notice or the
passage of time, or both, will constitute a default under the Lease.

     8.   No rental has been paid more than 30 days in advance and no security
deposit has been delivered to Landlord except as provided in the Lease.

     9.   If Tenant is a corporation, partnership or other business entity, each
individual executing this Estoppel Certificate on behalf of Tenant hereby
represents and warrants that Tenant is a duly formed and existing entity
qualified to do business in the state in which the Premises are located and that
Tenant has full right and authority to execute and deliver this Estoppel
Certificate and that each person signing on behalf of Tenant is authorized to do
so.

     10.  There are no actions pending against Tenant under any bankruptcy or
similar laws of the United States or any state.

     11.  Other than in compliance with all applicable laws and incidental to
the ordinary course of the use of the Premises, the undersigned has not used or
stored any hazardous substances in the Premises.

     12.  All tenant improvement work to be performed by Landlord under the
Lease has been completed in accordance with the Lease and has been accepted by
the undersigned and all reimbursements and allowances due to the undersigned
under the Lease in connection with any tenant improvement work have been paid in
full.

     Tenant acknowledges that this Estoppel Certificate may be delivered to
Landlord, Landlord's Mortgagee or to a prospective mortgagee or prospective
purchaser, and their respective successors and assigns, and acknowledges that
Landlord, Landlord's Mortgagee and/or such prospective mortgagee or prospective
purchaser will be relying upon the statements contained herein in disbursing
loan advances or making a new loan or acquiring the property of which the
Premises are a part and that receipt by it of this certificate is a condition of
disbursing loan advances or making such loan or acquiring such property.

Executed as of __________, 200_.

TENANT:                                 _______________________________________,
                                        a ______________________________________

                                        By:_____________________________________
                                        Name:___________________________________
                                        Title:__________________________________

                                      F-2
<PAGE>

                                   EXHIBIT G
                                   ---------

                                    PARKING
                                    -------

     Tenant may use up to 108 undesignated parking spaces and seven reserved
parking spaces in the parking garage/area associated with the Building (the
"Parking Area") during the initial Term subject to such terms, conditions and
 ------------
regulations as are from time to time applicable to patrons of the Parking Area.
Prior to April 1, 2003, the parking spaces granted to Tenant hereunder shall be
provided at no charge to Tenant. On and after April 1, 2003, and continuing
until the end of the initial Term, Tenant shall pay $40.00 per undesignated
parking space per month (plus any applicable taxes) for each undesignated
parking space leased hereunder and $125.00 (plus any applicable taxes) for each
of the reserved parking spaces leased hereunder, in each case, regardless of
whether Tenant elects to use such parking spaces. Following the expiration of
the initial Term, Tenant shall pay to Landlord for each parking space leased
hereunder, regardless of whether Tenant elects to use such parking space, the
amount charged to patrons of the Parking Area, as the same may change from time
to time. If, for any reason, Landlord is unable to provide Tenant the use of all
or any portion of the parking spaces to which it is entitled hereunder, then
Tenant's obligation to pay for such spaces shall be abated for so long as Tenant
does not have the use thereof; this abatement shall be in full settlement of all
claims that Tenant might otherwise have against Landlord because of Landlord's
failure or inability to provide Tenant with such parking spaces.

                                      G-1
<PAGE>

                                   EXHIBIT H
                                   ---------

                                RENEWAL OPTION
                                --------------

     Provided no Event of Default exists and Tenant is occupying the entire
Premises at the time of such election, Tenant may renew this Lease for one
additional period of five years, by delivering written notice of the exercise
thereof to Landlord not earlier than 12 months nor later than nine months before
the expiration of the Term. The Basic Rent payable for each month during such
extended Term shall be the prevailing rental rate (the "Prevailing Rental
                                                        -----------------
Rate"), at the commencement of such extended Term, for renewals of space in the
Building of equivalent quality, size, utility and location, with the length of
the extended Term and the credit standing of Tenant to be taken into account.
Within 30 days after receipt of Tenant's notice to renew, Landlord shall deliver
to Tenant written notice of the Prevailing Rental Rate and shall advise Tenant
of the required adjustment to Basic Rent, if any, and the other terms and
conditions offered. Tenant shall, within ten days after receipt of Landlord's
notice, notify Landlord in writing whether Tenant accepts or rejects Landlord's
determination of the Prevailing Rental Rate. If Tenant timely notifies Landlord
that Tenant accepts Landlord's determination of the Prevailing Rental Rate,
then, on or before the commencement date of the extended Term, Landlord and
Tenant shall execute an amendment to this Lease extending the Term on the same
terms provided in this Lease, except as follows:

          (a)  Basic Rent shall be adjusted to the Prevailing Rental Rate;

          (b)  Tenant shall have no further renewal option unless expressly
     granted by Landlord in writing;

          (c)  Landlord shall lease to Tenant the Premises in their then-current
     condition, and Landlord shall not provide to Tenant any allowances (e.g.,
     moving allowance, construction allowance, and the like) or other tenant
     inducements; and

          (d)  Tenant shall pay for the parking spaces which it is entitled to
     use at the rates from time to time charged to patrons of the Parking Area
     and/or any other parking area associated with the Building during the
     extended Term (plus all applicable taxes).

If Tenant rejects Landlord's determination of the Prevailing Rental Rate, and
timely notifies Landlord thereof, Tenant may, in its notice to Landlord, require
that the determination of the Prevailing Rental Rate be made by brokers (and if
Tenant makes such election, Tenant shall be deemed to have irrevocably renewed
the Term, subject only to the determination of the Prevailing Rental Rate as
provided below). In such event, within ten days thereafter, each party shall
select a qualified commercial real estate broker with at least ten years
experience in appraising property and buildings in the city or submarket in
which the Premises are located. The two brokers shall give their opinion of
prevailing rental rates within 20 days after their retention. In no event,
however, shall the Basic Rent in the renewal term be less than the then current
Basic Rent rate per rentable square foot in effect hereunder. In the event the
opinions of the two brokers differ and, after good faith efforts over the
succeeding 20 day period, they cannot mutually agree, the brokers shall
immediately and jointly appoint a third broker with the qualifications specified
above. This third broker shall immediately (within five days) choose either the
determination of Landlord's broker or Tenant's broker and such choice of this
third broker shall be final and binding on Landlord and Tenant. Each party shall
pay its own costs for its real estate broker. Following the determination of the
Prevailing Rental Rate by the brokers,

                                      H-1
<PAGE>

the parties shall equally share the costs of any third broker. The parties shall
immediately execute an amendment as set forth above. If Tenant fails to timely
notify Landlord in writing that Tenant accepts or rejects Landlord's
determination of the Prevailing Rental Rate, time being of the essence with
respect thereto, Tenant's rights under this Exhibit shall terminate and Tenant
shall have no right to renew this Lease.

     Tenant's rights under this Exhibit shall terminate if (1) this Lease or
Tenant's right to possession of the Premises is terminated, (2) Tenant assigns
any of its interest in this Lease or sublets any portion of the Premises, or (3)
Tenant fails to timely exercise its option under this Exhibit, time being of the
essence with respect to Tenant's exercise thereof.

                                      H-2
<PAGE>

                                   EXHIBIT I
                                   ---------

                          RIGHT OF FIRST OPPORTUNITY
                          --------------------------

     1.   Subject to then-existing renewal or expansion options of other
tenants, if Landlord has a bona fide prospect other than the then-current tenant
therein (the "Prospect") for any portion of the space on the fifth floor
              --------
designated on Exhibit A (the "Opportunity Space"), Landlord shall offer to lease
              ---------       -----------------
to Tenant the Opportunity Space on the same terms and conditions as offered to
the Prospect; such offer shall be in writing, specify the rent to be paid for
the Opportunity Space, contain the basic terms and conditions offered to the
Prospect and the date on which the Opportunity Space shall be included in the
Premises (the "Opportunity Notice"). Tenant shall notify Landlord in writing
               ------------------
whether Tenant elects to lease the entire portion of the Opportunity Space
subject to the same terms and conditions as offered to the Prospect as outlined
in the Opportunity Notice within five business days after Landlord delivers to
Tenant the Opportunity Notice. If Tenant timely elects to lease the Opportunity
Space within such five-business-day period, then Landlord and Tenant shall
execute an amendment to this Lease, effective as of the date the Opportunity
Space is to be included in the Premises, on the same terms as this Lease except
(a) the Basic Rent shall be the amount specified in the Offer Notice, (b) the
term for the Opportunity Space shall be that specified in the Offer Notice, (c)
Tenant shall lease the Opportunity Space in an "AS-IS" condition, Landlord shall
                                                -----
not be required to perform any work therein, and Landlord shall not provide to
Tenant any allowances other than those contained in the Opportunity Notice
(e.g., moving allowance, construction allowance, and the like) if any, and (d)
other matters set forth in the Lease which are inconsistent with the terms of
the Opportunity Notice shall be modified accordingly. Notwithstanding the
foregoing, if the Opportunity Notice includes space in excess of the Opportunity
Space, Tenant must exercise its right hereunder, if at all, as to all of the
space contained in the Opportunity Notice. If Tenant fails or is unable to
timely exercise its right hereunder, then such right shall lapse, time being of
the essence with respect to the exercise thereof (it being understood that
Tenant's right hereunder is a one-time right only), and Landlord may lease all
or a portion of the Opportunity Space to third parties on such terms as Landlord
may elect. Tenant may not exercise its rights under this Exhibit if an Event of
Default exists or Tenant is not then occupying the entire Premises. For purposes
hereof, if an Opportunity Notice is delivered for less than all of the
Opportunity Space but such notice provides for an expansion, right of first
refusal, or other preferential right to lease some of the remaining portion of
the Opportunity Space, then such remaining portion of the Opportunity Space
shall thereafter be excluded from the provisions of this Exhibit.

     2.   Prior to September 30, 2001, if Tenant is unable to exercise its
rights as provided hereunder as to the Opportunity Space due to the exercise by
JPI, Inc., a Texas corporation, of its right to renew its lease as to any
portion of the Opportunity Space, then, as soon as reasonably practicable,
Landlord shall designate as the Opportunity Space the next available space in
the Building that consists of between 15,000 rentable square feet of area and a
full floor of the Building, and Tenant's rights as provided hereunder shall
continue only as to such newly-designated Opportunity Space subject to the terms
and conditions of this Exhibit G.
                       ---------

     3.   Tenant's rights under this Exhibit shall terminate if (a) this Lease
or Tenant's right to possession of the Premises is terminated, (b) Tenant
assigns any of its interest in this Lease or sublets any portion of the Premises
other than to a Permitted Transferee, or (c) Tenant fails timely to exercise its
option as to any portion of the Opportunity Space; provided, however, that if
Landlord delivers to Tenant the Opportunity Notice before January 1, 2001 and
Tenant does not elect to lease the Opportunity Space as provided in paragraph 1
of this Exhibit G within five business days after Landlord delivers to Tenant
        ---------
the

                                      I-1
<PAGE>

Opportunity Notice, then, as soon as reasonably practicable, Landlord shall
designate as the Opportunity Space the next available space in the Building that
consists of between 15,000 rentable square feet of area and a full floor of the
Building, and Tenant's rights as provided hereunder shall not terminate but
shall continue only as to such newly-designated Opportunity Space subject to the
terms and conditions of this Exhibit G.
                             ---------

                                      I-2
<PAGE>

                             FORM OF OFFER NOTICE
                             --------------------

[Insert Date of Notice]

BY TELECOPY AND FEDERAL EXPRESS
-------------------------------
Tenfold Corporation

_________________________________
_________________________________
_________________________________

     Re:  Lease Agreement (the "Lease") dated February 4, 2000, between W9/CGN
                                -----
          Real Estate Limited Partnership, a Delaware limited partnership
          ("Landlord"), and Tenfold Corporation, a Delaware corporation
            --------                                      ------
          ("Tenant"). Capitalized terms used herein but not defined shall be
            ------
          given the meanings assigned to them in the Lease.

Ladies and Gentlemen:

     Pursuant to the Right of First Offer attached to the Lease, enclosed please
find an Offer Notice on Suite ______. The basic terms and conditions are as
follows:

LOCATION:           ____________________________________________

SIZE:               ___________ rentable square feet

BASIC RENT RATE:    $______ per month

TERM:               ____________________________________________

IMPROVEMENTS:       ____________________________________________

COMMENCEMENT:       ____________________________________________

PARKING TERMS:      ____________________________________________

OTHER MATERIAL TERMS: ___________________________________________

     Under the terms of the Right of First Offer, you must exercise your rights,
if at all, as to the Offer Space on the depiction attached to this Offer Notice
within ______ days after Landlord delivers such Offer Notice. Accordingly, you
have until 5:00 p.m. local time on _______________, 200__, to exercise your
rights under the Right of First Offer and accept the terms as contained herein,
failing which your rights under the Right of First Offer shall terminate and
Landlord shall be free to lease the Offer Space to any third party.

                                      I-3
<PAGE>

If possible, any earlier response would be appreciated. Please note that your
acceptance of this Offer Notice shall be irrevocable and may not be rescinded.

     Upon receipt of your acceptance herein, Landlord and Tenant shall execute
an amendment to the Lease memorializing the terms of this Offer Notice including
the inclusion of the Offer Space in the Premises; provided, however, that the
failure by Landlord and Tenant to execute such amendment shall not affect the
inclusion of such Offer Space in the Premises in accordance with this Offer
Notice.

     THE FAILURE TO ACCEPT THIS OFFER NOTICE BY (1) DESIGNATING THE "ACCEPTED"
BOX, AND (2) EXECUTING AND RETURNING THIS OFFER NOTICE TO LANDLORD WITHOUT
MODIFICATION WITHIN SUCH TIME PERIOD SHALL BE DEEMED A WAIVER OF TENANT'S RIGHTS
UNDER THE RIGHT OF FIRST OFFER, AND TENANT SHALL HAVE NO FURTHER RIGHTS TO THE
OFFER SPACE. THE FAILURE TO EXECUTE THIS LETTER WITHIN SUCH TIME PERIOD SHALL BE
DEEMED A WAIVER OF THIS OFFER NOTICE.

     Should you have any questions, do not hesitate to call.

Sincerely,

________________________________
________________________________
________________________________

[please check appropriate box]

ACCEPTED  [_]
REJECTED  [_]

TENFOLD CORPORATION, a Delaware corporation

By:    ____________________________
Name:  ____________________________
Title: ____________________________
Date:  ____________________________

Enclosure [attach depiction of Offer Space]

                                      I-4
<PAGE>

                                   EXHIBIT J
                                   ---------

                           FORM OF LETTER OF CREDIT
                           ------------------------

                            ________________, 200__

                IRREVOCABLE, UNCONDITIONAL LETTER OF CREDIT NO.____

W9/CGN Real Estate Limited Partnership
c/o Archon Group, L.P.
600 Las Colinas Boulevard, Suite 400
Irving, Texas 75039

Gentlemen:

     ________________________, a national banking association ("Bank"), of
                                                                ----
________, _______________ hereby issues its Irrevocable, Unconditional Letter of
Credit in favor of W9/CGN REAL ESTATE LIMITED PARTNERSHIP, a Delaware limited
partnership, and/or its successors and assigns ("Landlord") for the account of
                                                 --------
TENFOLD CORPORATION, a Delaware corporation ("Tenant") up to the aggregate
                                              ------
amount of $__________, available at sight by the drafts of Landlord on the Bank.
Drafts drawn on this Letter of Credit will be honored when presented,
accompanied only by a letter or certificate executed by a representative of
Landlord stating that it is entitled to draw on this Letter of Credit under the
terms of the Lease Agreement, dated as of February 4, 2000, between Landlord and
Tenant. Partial draws shall be permitted hereunder. This Letter of Credit may be
assigned.

     The Bank shall be entitled (and required) to rely upon the statements
contained in the above-described letter or certificate and will have no
obligation to verify the truth of any statements set forth therein.

     The Bank hereby agrees with drawers, endorsers, and bona fide holders of
this Letter of Credit that all drafts drawn by reason of this Letter of Credit
and in accordance with the above conditions, will meet with due honor when
presented at the office of the Bank in _______________, _______________.

     The obligations of the Bank shall not be subject to any claim or defense by
reason of the invalidity, illegality, or inability to enforce any of the
agreement set forth in the Lease.

     This Letter of Credit is subject to the Uniform Customs and Practices for
Documentary Credits (1993 Revision) fixed by the International Chamber of
Commerce (publication 500) when not in conflict with the express terms of this
Letter of Credit or with the provisions of Article 5 of the Texas Business and
Commerce Code, as amended.

     This Letter of Credit shall terminate at 3:00 p.m. Central Daylight Savings
Time on the first anniversary date following the date hereof.

                                      J-1
<PAGE>

     Amounts drawn upon this Letter of Credit are to be endorsed on the reverse
side of this Letter of Credit by the negotiating bank.

     THIS WRITTEN LOAN AGREEMENT REPRESENTS THE FINAL AGREEMENT BETWEEN THE
PARTIES THAT MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR
SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL
AGREEMENTS BETWEEN THE PARTIES.

                              _____________________________________________

                              By:__________________________________________
                              Name:________________________________________
                              Title:_______________________________________

                                      J-2
<PAGE>

                                   EXHIBIT K
                                   ---------

                        SCHEDULE OF JANITORIAL SERVICES
                        -------------------------------

OFFICE AREAS:
------------

     1.   Empty, clean and damp dust all waste receptacles and remove waste
          paper and rubbish from the Premises nightly; wash receptacles as
          necessary.

     2.   Empty and clean all ash trays, screen all sand urns nightly and supply
          and replace sand as necessary.

     3.   Vacuum all rugs and carpeted areas in offices, lobbies and corridors
          nightly. Spot clean carpets as needed.

     4.   Hand dust and wipe clean with damp or treated cloth all office
          furniture, files, fixtures, paneling, window sills and other
          horizontal surfaces nightly; wash window sills when necessary.

     5.   Damp wipe and polish all glass furniture tops nightly.

     6.   Remove all finger marks and smudges from vertical surfaces, including
          doors, door frames, around light switches, private entrance glass and
          partitions nightly.

     7.   Wash clean all water coolers nightly.

     8.   Sweep all stairways nightly, vacuum if carpeted.

     9.   Police all stairwells throughout the entire building daily and keep in
          clean condition.

     10.  Damp mop spillage in office and public areas as required.

     11.  Damp dust all telephones as necessary.

WASHROOMS:
---------

     1.   Mop, rinse and dry floors nightly.

     2.   Scrub floors weekly.

     3.   Clean all mirrors, bright work and enameled surfaces nightly.

     4.   Wash and disinfect all basis, urinals and bowls nightly, using non-
          abrasive cleaners to remove stains and clean underside of rim on
          urinals and bowls nightly.

                                      K-1
<PAGE>

     5.   Wash both sides of all toilet seats with soap and water and disinfect
          nightly.

     6.   Damp wipe nightly, wash all partitions, tile walls and outside surface
          of all dispensers and receptacles.

     7.   Empty and sanitize all receptacles and sanitary disposals nightly;
          thoroughly clean and wash at least once per week.

     8.   Fill toilet tissue, soap, towel and sanitary napkin dispensers
          nightly.

     9.   Clean flushometers, piping, toilet seat hinges and other metal work
          nightly.

     10.  Wash and polish all wall, partitions, tile walls and enamel surfaces
          from trim to floor monthly or as needed.

     11.  Vacuum all louvers, ventilating grills, and dust light fixtures
          monthly.

FLOORS:
------

     1.   Ceramic tile, marble and terrazzo floors to be swept and buffed
          nightly and washed or scrubbed as necessary.

     2.   Vinyl asbestos, asphalt, vinyl, rubber or other composition floors and
          bases to be swept nightly; such floors in public areas on multiple
          tenancy floors to be waxed and buffed as needed.

     3.   Tile floors in office areas will be washed and buffed monthly.

     4.   All vinyl floors stripped and rewaxed as necessary.

     5.   All carpeted areas and rugs to be vacuumed clean nightly.

     6.   Detail vacuuming shall be performed as necessary.

RAISED COMPUTER FLOORS:
----------------------

     1.   Dry mop and spot clean all computer flooring nightly.

     2.   West mop all computer flooring at least once weekly. Mopping may be
          performed on separate sections of the computer flooring on successive
          nights, as long as entire raised flooring is mopped once during each
          one-week period.

     3.   Buff all computer flooring monthly.

     4.   Computer sub-flooring shall be cleaned annually by contractor, or as
          necessary.

                                      K-2
<PAGE>

GLASS:
-----

     1.   Clean glass entrance doors, adjacent glass panels, and any common area
          glass nightly.

HIGH DUSTING (as needed):
------------

     1.   Dust and wipe clean all closet shelving when empty and carpet sweep or
          dry mop all floors in closets if such are empty.

     2.   Dust all picture frames, charts, graphs, and similar wall hangings.

     3.   Dust clean all verticals such as walls, partitions, doors, door bucks,
          and other surfaces above shoulder height.

     4.   Damp dust all ceiling air conditions diffusers, wall grilles,
          registers and other ventilating louvers.

     5.   Dust the exterior surfaces of lighting fixtures, including glass and
          plastic enclosures.

     6.   Dust all mini blinds.

ELEVATORS:
---------

     1.   Carpets will be vacuumed daily and spot cleaned as necessary.

     2.   Exterior and interior doors and trim will be dusted nightly.

     3.   Cabinets will be dusted nightly.

     4.   Control and dispatch panels will be dusted and polished as necessary.

     5.   Elevator thresholds will be cleaned nightly.

     6.   Hardwood surfaces will be kept clean.

     7.   Telephones will be kept dust free.

GENERAL:
-------

     1.   Wipe all interior metal window frames, mullions, and other unpainted
          interior metal surfaces of the perimeter walls of the building each
          time the interior of the window is washed (as requested by the
          Manager).

                                      K-3
<PAGE>

     2.   Keep slopsink rooms in a clean, neat and orderly condition at all
          times.

     3.   Wipe clean and polish all metal hardware fixtures and other bright
          work nightly.

     4.   Dust and/or wash all directory boards as required, remove fingerprints
          and smudges nightly.

     5.   Maintain building lobby, corridors and other public areas in a clean
          condition.

     6.   Dust fire extinguishers and cabinets nightly (interior and exterior);
          wash as necessary.

     7.   All baseboards (resilient flooring and carpeted areas) will be washed
          and wiped clean as necessary.

     8.   Vacuum entrance mats nightly.

     9.   Perform special cleaning needs of individual tenants only as
          authorized and directed by the Manger.

     10.  Properly maintain exterior of building at ground level by ensuring
          that curtain wall, glass, marble, etc., is kept in a clean condition.
          Exterior stainless steel is to be cleaned or polished weekly.

     11.  Polish standpipes and sprinkler siamese connections as necessary.

                                      K-4
<PAGE>

                                   EXHIBIT L
                                   ---------

                 SUBORDINATION, NON-DISTURBANCE AND ATTORNMENT AGREEMENT
                 -------------------------------------------------------

     This Subordination, Non-Disturbance, and Attornment Agreement ("Agreement")
                                                                     ---------
is made as of February 4, 2000, by and among LaSALLE NATIONAL BANK, with a place
                       -
of business at 135 South LaSalle Street, Chicago, Illinois 60603 ("Collateral
                                                                   ----------
Agent"), W9/CGN REAL ESTATE LIMITED PARTNERSHIP, a Delaware limited partnership
-----
("Landlord"), and TENFOLD CORPORATION, a Delaware corporation, with a place of
  --------
business as stated in the Lease (as defined below) ("Tenant").
                                                     ------

     A.   Tenant has entered into a certain lease dated February 4, 2000 (the
"Lease"), with Landlord covering certain premises (the "Premises") at the
 -----                                                  --------
property known as 600 Las Colinas Boulevard, Irving, Texas 75039 (the
"property").
 --------

     B.   The Collateral Agent is acting for the benefit of certain Lenders (the
"Lenders") in connection with a loan to Landlord (the "Loan") secured by a First
 -------                                               ----
Deed of Trust, Security Agreement and Fixture Filing (the "Mortgage") and by
                                                           --------
other security instruments (the Mortgage, such other security instruments and
the loan agreement, collectively, the "Loan Documents").
                                       --------------

     NOW, THEREFORE, for good and valuable consideration, the receipt and
adequacy of which are hereby acknowledged, the parties hereby covenant and agree
as follows:

     1.   Subordination.  The Lease and all rights created thereby are and shall
          -------------
be subject and subordinate to the Loan Documents and to any and all renewals,
modifications, consolidations, replacements, and extensions thereof and all
advances made thereunder, to the full extent of all sums due to the Lenders. The
Loan Documents shall take priority over the Lease and shall be entitled to the
same rights and privileges, both at law and in equity, as the Loan Documents
would have had if they had been executed, delivered, and recorded prior to the
execution, delivery, or recording of the Lease.

     2.   Non-Disturbance.  If the Lenders or any of their agents succeed to the
          ---------------
interest of Landlord under the Lease and no event of default shall then be
continuing under the Lease, the Lenders or such agents shall not disturb
Tenant's possession of the Premises or its rights under the Lease, except in
accordance with the terms of the Lease and this Agreement, and the Lease shall
continue as a lease between Tenant and Lenders or such agents. Neither Lenders
nor their agents shall join Tenant in summary or foreclosure proceedings,
provided the Lease is then in full force and effect and Tenant is not in default
thereunder.

     3.   Attornment.  Tenant agrees that, following foreclosure or any deed in
          ----------
lieu of foreclosure, it will attorn to, and recognize as its landlord, the
Lenders or any agent acting on behalf of the Lenders or any purchaser at a
foreclosure sale and their respective successors and assigns (the "Successor
                                                                   ---------
Landlord") for the unexpired balance of the term of the Lease (and any
--------
extensions, if exercised) upon the same terms and conditions as are set forth in
the Lease. This agreement shall be effective without further written agreement,
but, on request of such Successor Landlord, Tenant agrees to execute and deliver
an agreement of attornment of similar import to this Agreement. Tenant agrees
that foreclosure of the Mortgage will not be a constructive eviction of Tenant.
Tenant shall not join, appear, or petition to become a party in any foreclosure
action.

                                      L-1
<PAGE>

     4.   Liability of Lenders.  If a Successor Landlord succeeds to the
          --------------------
interest of Landlord under the Lease, such Successor Landlord shall assume and
perform (but only while such Successor Landlord is the owner of the Property)
all of Landlord's obligations under the Lease, except that the Successor
Landlord shall not be:

          (a)  liable for any action or omission of any prior landlord,
including the present Landlord (the "Former Landlord");
                                     ---------------

          (b)  liable for the return of any security deposit not actually
received by such Successor Landlord;

          (c)  subject to any offsets or defenses which Tenant might have
against the Former Landlord (including any claim for damages of any kind
whatsoever as the result of any breach by a Former Landlord that occurred before
the date of attornment) (the "Offset Rights");
                              -------------

          (d)  bound by any rent or additional rent which Tenant might have paid
for more than the then current month to any Former Landlord;

          (e)  bound by any assignment, surrender, termination, cancellation,
amendment, or modification of the Lease made without its express written
consent;

          (f)  bound by any sum(s) that any Former Landlord owed to Tenant; or

          (g)  bound by any obligation of a Former Landlord under the Lease to
make, pay for, or reimburse Tenant for any alterations, demolition, or other
improvements or work (other than day-to-day maintenance and repairs).

     5.   Notice and Right to Cure.  Tenant agrees to give the Collateral Agent
          ------------------------
at the time given to Landlord a copy of any notice of default served upon
Landlord. If Landlord fails to cure such default within the time provided for in
the Lease, the Collateral Agent and the Lenders shall have the right, but not
the obligation, to cure such default within a reasonable time thereafter (but in
no event more than 60 days from the expiration of Landlord's cure period), or if
such default cannot be cured within such reasonable time then such additional
time as may be necessary to cure such default, provided the Collateral Agent
and/or the Lenders have commenced and are diligently pursuing the remedies
necessary to cure such default (including, without limitation, commencement of
foreclosure proceedings if necessary to effect such cure). In such event, the
Lease shall not be terminated or the rights of Landlord under the Lease
forfeited or adversely affected during such reasonable time or while the
Collateral Agent and/or the Lenders diligently pursue such remedies. Neither the
Collateral Agent nor any Lender shall have any obligation to cure, or liability
or obligation for not curing.

     6.   Assignment of Lease.  Tenant acknowledges that the Lease is being
          -------------------
assigned to the Collateral Agent under the Loan Documents. The interest of
Landlord in the Lease is being assigned to the Collateral Agent, but the
Collateral Agent assumes no duty, liability, or obligation whatever under the
Lease. Unless and until different written instructions from the Collateral Agent
are received by Tenant, all rent payments under the Lease shall be paid directly
to the Cash Receipts Account (as defined in the Loan Agreement) in accordance
with the terms of the tenant notice delivered to Tenant by Landlord pursuant to
the Loan Agreement, a copy of which is attached hereto.

                                     L-2
<PAGE>

     7.   Effect of Foreclosure.  Any right of Tenant to purchase the Property,
          ---------------------
including any right of first refusal, shall not apply to a foreclosure sale.

     8.   Exculpation of Successor Landlord.  Notwithstanding anything to the
          ---------------------------------
contrary in this Agreement or the Lease, upon any attornment pursuant to this
Agreement the Lease shall be deemed to have been automatically amended to
provide that Successor Landlord's obligations and liability under the Lease
shall never extend beyond Successor Landlord's (or its successors' or assigns')
interest, if any, in the premises covered by the Lease from time to time,
including insurance and condemnation proceeds and Successor Landlord's interest
in the Lease (collectively, "Successor Landlord's Interest"). Tenant shall look
                             -----------------------------
exclusively to Successor Landlord's Interest (or that of its successors and
assigns) for payment or discharge of any obligations of Successor Landlord under
the Lease as affected by this Agreement. If Tenant obtains any money judgment
against Successor Landlord with respect to the Lease or the relationship between
Successor Landlord and Tenant, then Tenant shall look solely to Successor
Landlord's Interest (or that of its successors and assigns) to collect such
judgment. Tenant shall not collect or attempt to collect any such judgment out
of any other assets of Successor Landlord.

     9.   Interpretation; Governing Law.  The interpretation, validity and
          -----------------------------
enforcement of this Agreement shall be governed by and construed under the
internal laws of the State of New York, excluding its principles of conflict of
laws.

     10.  Amendments.  No modification, amendment, waiver, or release of any
          ----------
provisions of this Agreement or of any right, obligation, claim or cause of
action arising hereunder shall be valid or binding for any purpose whatsoever
unless in writing and duly executed by the party against which the same is
sought to be asserted.

     11.  Notices.  All notices, directions, demands, requests, permissions,
          -------
approvals, consents, elections or other communications permitted or required to
be given hereunder (singly, a "notice" or collectively, "notices") shall be in
                               ------                    -------
writing, shall be effective for all purposes if hand delivered or sent by
expedited prepaid delivery service (either commercial or United States Postal
Service) with proof of delivery, and shall be deemed given on the date of actual
receipt by the entity to which it is directed, notwithstanding any further
direction to the attention of any individual or department. Notices shall be
addressed to any party hereto at its address first above written. Notices to the
Lenders shall be addressed to the Collateral Agent on the Lenders' behalf at the
address of the Collateral Agent first above written. Any address or name
specified above may be changed by a notice given in accordance with this
Section. The inability to deliver because of a changed address of which no
notice was given, rejection, or other refusal to accept any notice shall be
deemed to be the receipt of the notice as of the date of such inability to
deliver, rejection, or refusal to accept.

     12.  Successors and Assigns.  The terms of this Agreement shall be binding
          ----------------------
upon, inure to benefit of, and be enforceable by, the parties and their
respective successors and assigns.

                                      L-3
<PAGE>

     IN WITNESS WHEREOF, the parties have caused this Agreement to be duly
executed as of the date first above written.

LENDER:                       LaSALLE NATIONAL BANK, as Collateral Agent

                              By:_________________________________________
                              Name:_______________________________________
                              Title:______________________________________

LANDLORD:                     W9/CGN REAL ESTATE LIMITED PARTNERSHIP, a
                              Delaware limited partnership

                              By:  W9/CGN Gen-Par, Inc., a Delaware corporation,
                                   its general partner

                                   By:____________________________________
                                   Name:__________________________________
                                   Title:_________________________________

TENANT:                       TENFOLD CORPORATION, a Delaware corporation

                              By:_________________________________________
                              Name:_______________________________________
                              Title:______________________________________

                                      L-4<PAGE>

                                                                    Exhibit 10.3

                             150 CALIFORNIA STREET
                           SAN FRANCISCO, CALIFORNIA

                            OFFICE LEASE AGREEMENT

                                    BETWEEN

    EOP-150 CALIFORNIA STREET, L.L.C., a Delaware limited liability company
                                 ("LANDLORD")

                                      AND

                  TENFOLD CORPORATION, a Delaware corporation
                                  ("TENANT")
<PAGE>

                            OFFICE LEASE AGREEMENT

     THIS OFFICE LEASE AGREEMENT (the "Lease") is made and entered into as of
the 3/rd/ day of March, 2000, by and between EOP-150 CALIFORNIA STREET, L.L.C.,
a Delaware limited liability company ("Landlord") and TENFOLD CORPORATION, a
Delaware corporation ("Tenant").

I.   Basic Lease Information.

     A.   "Building" shall mean that certain building to be constructed at 150
          California Street, San Francisco, California, commonly known as 150
          California Street. As of the date of this Lease, Landlord has not
          caused the Building to be fully constructed.

     B.   "Rentable Square Footage of the Building" is deemed to be
          approximately 201,787 square feet, subject to adjustment as provided
          below in Section I.C.

     C.   "Premises A", "Premises B" and "Premises C" shall mean the areas shown
          on Exhibits A-1, A-2, and A-3, respectively, to this Lease. Premises A
          consists of approximately 9,819 rentable square feet described as
          Suite No. 700 on the 7/th/ floor and approximately 9,829 rentable
          square feet described as Suite No. 800 on the 8/th/ floor. Premises B
          consists of approximately 9,162 rentable square feet described as
          Suite No. 500 on the 5/th/ floor and approximately 6,266 rentable
          square feet described as Suite No. 600 on the 6/th/ floor. Premises C
          consists of approximately 14,095 rentable square feet described as
          Suite No. 200 on the 2/nd/ floor, approximately 14,105 rentable square
          feet described as Suite No. 300 on the 3/rd/ floor, and approximately
          14,154 rentable square feet described as Suite No. 400 on the 4/th/
          floor. Premises A, Premises B and Premises C are collectively referred
          to herein as the "Premises". The "Rentable Square Footage of Premises
          A" is deemed to be 19,648 square feet. The "Rentable Square Footage of
          Premises B" is deemed to be 15,428 square feet. The "Rentable Square
          Footage of Premises C" is deemed to be 42,354 square feet.
          Collectively, the "Rentable Square Footage of the Premises" is deemed
          to be 77,430 square feet. If the Premises include one or more floors
          in their entirety, all corridors and restroom facilities located on
          such full floor(s) shall be considered part of the Premises. Upon
          substantial completion of the Building, Landlord shall have its
          architect measure the Premises and Building in accordance with
          Landlord's standard measurement practices for the Building,
          consistently applied, in order to determine the Rentable Square
          Footage of the Premises and Rentable Square Footage of the Building.
          Landlord currently anticipates utilizing Stephenson Systems, Inc. to
          perform such remeasurement. Such remeasurement shall be conducted
          using the following load factors for the following floors of the
          Premises: (i) single tenant/full floor load factor of approximately
          18.31% (not to exceed 20.31%) for the 2/nd/ floor of the Building;
          (ii) single tenant/full floor load factor of approximately 17.97% (not
          to exceed 19.97%) for the 3/rd/ floor of the Building; (iii) single
          tenant/full floor load factor of approximately 17.94% (not to exceed
          19.94%) for the 4/th/ floor of the Building; (iv) single tenant/full
          floor load factor of approximately 22.08% (not to exceed 24.08%) for
          the 5/th/ floor of the Building; (v) single tenant/full floor load
          factor of approximately 30.18% (not to exceed 32.18%) for the 6/th/
          floor of the Building; (vi) single tenant/full floor load factor of
          approximately 20.80% (not to exceed 22.80%) for the 7/th/ floor of the
          Building; and (vii) single tenant/full floor load factor of
          approximately 21.33% (not to exceed 23.33%) for the 8/th/ floor of the
          Building. Upon such determination, Landlord and Tenant shall enter
          into the amendment as described in the last paragraph of Section I.D.
          below.

                                       1
<PAGE>

     D.   "Base Rent":

     ---------------------------------------------------------------------------
                                        PREMISES A
     ---------------------------------------------------------------------------
                                  Annual Rate        Annual             Monthly
     Period                     Per Square Foot     Base Rent          Base Rent
     ---------------------------------------------------------------------------
     5/1/2000 - 4/30/2003             $47.00      $  923,456.04      $ 76,954.67
     ---------------------------------------------------------------------------
     5/1/2003 - 4/30/2005             $49.00      $  962,751.96      $ 80,229.33
     ---------------------------------------------------------------------------
     5/1/2005 - 6/30/2008             $53.00      $1,041,344.04      $ 86,778.67
     ---------------------------------------------------------------------------

     ---------------------------------------------------------------------------
                                        PREMISES B
     ---------------------------------------------------------------------------
                                  Annual Rate        Annual             Monthly
     Period                     Per Square Foot     Base Rent          Base Rent
     ---------------------------------------------------------------------------
     5/22/2000 - 5/31/2000            $47.00      $  725,115.96      $ 19,492.40
     ---------------------------------------------------------------------------
     6/1/2000 - 4/30/2003             $47.00      $  725,115.96      $ 60,426.33
     ---------------------------------------------------------------------------
     5/1/2003 - 4/30/2005             $49.00      $  755,972.04      $ 62,997.67
     ---------------------------------------------------------------------------
     5/1/2005 - 6/30/2008             $53.00      $  817,683.96      $ 68,140.33
     ---------------------------------------------------------------------------

     ---------------------------------------------------------------------------
                                        PREMISES C
     ---------------------------------------------------------------------------
                                  Annual Rate        Annual             Monthly
     Period                     Per Square Foot     Base Rent          Base Rent
     ---------------------------------------------------------------------------
     6/19/2000 - 6/30/2000            $47.00      $1,990,638.00      $ 66,354.60
     ---------------------------------------------------------------------------
     7/1/2000 - 4/30/2003             $47.00      $1,990,638.00      $165,886.50
     ---------------------------------------------------------------------------
     5/1/2003 - 4/30/2005             $49.00      $2,075,346.00      $172,945.50
     ---------------------------------------------------------------------------
     5/1/2005 - 6/30/2008             $53.00      $2,244,762.00      $187,063.50
     ---------------------------------------------------------------------------

     Landlord and Tenant acknowledge that the foregoing schedules are based on
     the Premises A Term (as hereinafter defined) commencing on May 1, 2000, the
     Premises B Term (as hereinafter defined) commencing on May 22, 2000, and
     the Premises C Term (as hereinafter defined) commencing on June 19, 2000.
     In the event the Premises A Term commences on a date other than May 1,
     2000, the Premises B Term commences on a date other then May 22, 2000, or
     the Premises C Term commences on a date other than June 19, 2000, the
     foregoing schedule(s) shall be recalculated, as applicable, to reflect the
     modified commencement date(s).

     Landlord and Tenant further acknowledge that the foregoing schedules are
     based upon the assumption that the Premises shall contain a total of 77,430
     square feet of Rentable Square Footage. In the event that the Premises
     contain other than 77,430 square feet of Rentable Square Footage as a
     result of a remeasurement of the Premises by Landlord's architect as
     provided in Section I.C. above, the foregoing schedules shall be
     recalculated based upon the actual Rentable Square Footage of the Premises,
     and upon such determination of the Rentable Square Footage of the Premises,
     Landlord and Tenant shall promptly enter into an amendment to this Lease to
     modify (i) the total Rentable Square Footage of the Premises, (ii) the
     Rentable Square Footage of the Building (to reflect any change in the
     Rentable Square Footage of the Building as a result of a remeasurement of
     the Building by Landlord's architect as provided in Section I.C. above),
     (iii) the amount of the monthly installments of Base Rent

                                       2
<PAGE>

          payable by Tenant with respect to the Premises, (iv) the amount of the
          Allowance, if any, and (v) any other matters which are affected by a
          change in the Rentable Square Footage of the Premises.

     E.   "Tenant's Pro Rata Share": 9.7370% for Premises A; 7.6457% for
          Premises B; and 20.9895% for Premises C. The Tenant's Pro Rata Share
          for the entire Premises is 38.3722%. As used herein, "Tenant's Pro
          Rata Share" shall mean, from time to time, the combined Tenant's Pro
          Rata Share for Premises A, Premises B and Premises C to the extent the
          Premises A Commencement Date (as hereinafter defined), Premises B
          Commencement Date (as hereinafter defined) and Premises C Commencement
          Date (as hereinafter defined) has occurred.

     F.   "Base Year" for Taxes: 2000; "Base Year" for Expenses: 2000.

     G.   "Term": With respect to Premises A, a period of 98 months; with
          respect to Premises B, a period of 97 months and 10 days; and with
          respect to Premises C, a period of 96 months and 12 days. The
          "Premises A Term" shall commence on May 1, 2000 ("Premises A
          Commencement Date") and end on the Termination Date (as hereinafter
          defined). The "Premises B Term" shall commence on May 22, 2000
          ("Premises B Commencement Date") and end on the Termination Date. The
          "Premises C Term" shall commence on June 19, 2000 ("Premises C
          Commencement Date") and end on the Termination Date. The Premises A
          Commencement Date, the Premises B Commencement Date and the Premises C
          Commencement Date are individually referred to herein as a
          "Commencement Date". Unless terminated early in accordance with this
          Lease, the Premises A Term, the Premises B Term and the Premises C
          Term shall end on June 30, 2008 (the "Termination Date"). However, if
          Landlord is required to Substantially Complete (defined in Section
          III.A) any Landlord Work (defined in Section I.O.) in Premises A,
          Premises B or Premises C prior to the Premises A Commencement Date,
          Premises B Commencement Date or Premises C Commencement Date, as the
          case may be, under the terms of a Work Letter (defined in Section
          I.O): (1) the dates set forth above as the Premises A Commencement
          Date, Premises B Commencement Date and Premises C Commencement Date,
          as the case may be, shall instead be defined as the "Target Premises A
          Commencement Date", "Target Premises B Commencement Date" and "Target
          Premises C Commencement Date", respectively, by which date Landlord
          will use reasonable efforts to Substantially Complete the applicable
          Landlord Work; and (2) the actual Premises A Commencement Date,
          Premises B Commencement Date and Premises C Commencement Date, as the
          case may be, shall be the date on which the Landlord Work is
          Substantially Complete in Premises A, Premises B and Premises C,
          respectively, as determined by Section III.A. In such circumstances,
          the Termination Date will instead be 96 months after the last to occur
          of the Premises A Commencement Date, Premises B Commencement Date and
          Premises C Commencement Date. Landlord's failure to Substantially
          Complete the Landlord Work by the applicable Target Commencement Date
          shall not be a default by Landlord or otherwise render Landlord liable
          for damages. Promptly after the determination of the last to occur of
          the Premises A Commencement Date, Premises B Commencement Date and
          Premises C Commencement Date, Landlord and Tenant shall enter into a
          commencement letter agreement in the form attached as Exhibit C.

     H.   Tenant allowance(s): $36.50 per rentable square foot of the Premises,
          as more fully set forth on Exhibit D.

     I.   "Security Deposit" shall mean $3,000,000.00 in the form of a letter of
          credit, as more fully described in Article VI.

     J.   "Guarantor(s)": As of the date of this Lease, there are no Guarantors.

     K.   "Broker(s)":  Cushman & Wakefield of California, Inc.

     L.   "Permitted Use": General office use which shall include software
          development, training and demonstrations.

                                       3
<PAGE>

     M.   "Notice Addresses":

          Tenant:

          Prior to the Premises A Commencement Date, notices shall be sent to
          Tenant at the following address:

          TenFold Corporation
          180 West Election Road
          Suite 100
          Draper, Utah  84020
          Attn: General Counsel
          Phone #: (801) 495-1010
          Fax #: (801) 495-0353

          On and after the Commencement Date, notices shall be sent to Tenant at
          the Premises with copies to:

          TenFold Corporation            and       TenFold Corporation
          180 West Election Road                   100 Foster City Boulevard
          Suite 100                                Suite 200
          Draper, Utah 84020                       Foster City, California 94404
          Attn: General Counsel                    Attn: Lease Administrator
          Phone #: (801) 495-1010                  Phone #: (650) 570-5711
          Fax #: (801) 495-0353                    Fax #: (650) 570-5988

          If any additional person listed above fails to receive the copy of the
          notice of Tenant default, the validity of the notice served on Tenant
          shall not be affected thereby.

          Landlord:                            With a copy to:

          EOP-150 California Street, L.L.C.       Equity Office Properties Trust
          c/o Equity Office Properties Trust      Two North Riverside Plaza
          150 California Street                   Suite 2200
          San Francisco, California 94104         Chicago, Illinois 60606
          Attention: Building Manager             Attention: Regional Counsel -
                                                  Pacific Region

          Rent (defined in Section IV.A) is payable to the order of Equity
          Office Properties at the following address: TO BE DETERMINED.

     N.   "Business Day(s)" are Monday through Friday of each week, exclusive of
          New Year's Day, Memorial Day, Independence Day, Labor Day,
          Thanksgiving Day and Christmas Day ("Holidays"). Landlord may
          designate additional Holidays, provided that the additional Holidays
          are commonly recognized by other Class A office buildings in the area
          where the Building is located.

     O.   "Landlord Work" means the work, if any, that Landlord is obligated to
          perform in the Premises pursuant to a separate work letter agreement
          (the "Work Letter"), if any, attached as Exhibit D. If a Work Letter
          is not attached to this Lease or if an attached Work Letter does not
          require Landlord to perform any work, the occurrence of the
          Commencement Date shall not be conditioned upon the performance of
          work by Landlord and, accordingly, Section III.A. shall not be
          applicable to the determination of the Commencement Date.

     P.   "Law(s)" means all applicable statutes, codes, ordinances, orders,
          rules and regulations of any municipal or governmental entity.

     Q.   "Normal Business Hours" for the Building are 7:00 a.m. to 6:30 p.m. on
          Business Days.

     R.   "Property" means the Building and the parcel(s) of land on which it is
          located and, at Landlord's discretion, the Building garage and other
          improvements serving the Building, if any, and the parcel(s) of land
          on which they are located.

                                       4
<PAGE>

II.  Lease Grant.

     Landlord leases the Premises to Tenant and Tenant leases the Premises from
Landlord, together with the right in common with others to use any portions of
the Property that are designated by Landlord for the common use of tenants and
others, such as sidewalks, unreserved parking areas, common corridors, elevator
foyers, restrooms, vending areas and lobby areas (the "Common Areas").

III. Adjustment of Commencement Date; Possession.

     A.   The Landlord Work with respect to Premises A shall be deemed to be
          "Substantially Complete" on the later of (i) the date that all
          Landlord Work for Premises A has been performed other than any details
          of construction, mechanical adjustment or any other similar matter,
          the noncompletion of which does not materially interfere with Tenant's
          use of Premises A, or (ii) the date Landlord receives (or would have
          received absent any Tenant Delays) all governmental approvals which
          are required to obtain a temporary or permanent certificate of
          occupancy for the Building and/or Premises A (as required) from the
          local governmental authority. The Landlord Work with respect to
          Premises B shall be deemed to be "Substantially Complete" on the later
          of (i) the date that all Landlord Work for Premises B has been
          performed other than any details of construction, mechanical
          adjustment or any other similar matter, the noncompletion of which
          does not materially interfere with Tenant's use of Premises B, or (ii)
          the date Landlord receives (or would have received absent any Tenant
          Delays) all governmental approvals which are required to obtain a
          temporary or permanent certificate of occupancy for the Building
          and/or Premises B (as required) from the local governmental authority.
          The Landlord Work with respect to Premises C shall be deemed to be
          "Substantially Complete" on the later of (i) the date that all
          Landlord Work for Premises C has been performed other than any details
          of construction, mechanical adjustment or any other similar matter,
          the noncompletion of which does not materially interfere with Tenant's
          use of Premises C, or (ii) the date Landlord receives (or would have
          received absent any Tenant Delays) all governmental approvals which
          are required to obtain a temporary or permanent certificate of
          occupancy for the Building and/or Premises C (as required) from the
          local governmental authority. However, if Landlord is delayed in the
          performance of the Landlord Work as a result of any Tenant Delay(s)
          (defined below), the Landlord Work for Premises A, Premises B and
          Premises C, as the case may be, shall be deemed to be Substantially
          Complete on the date that Landlord could reasonably have been expected
          to Substantially Complete the applicable Landlord Work absent any
          Tenant Delay. "Tenant Delay" means any act or omission of Tenant or
          its agents, employees, vendors or contractors that actually delays the
          Substantial Completion of the applicable Landlord Work, including,
          without limitation: (1) Tenant's failure to furnish information or
          approvals within any time period specified in this Lease, including
          the failure to prepare or approve preliminary or final plans by any
          applicable due date; (2) Tenant's selection of equipment or materials
          that have long lead times after first being informed by Landlord that
          the selection may result in a delay; (3) changes requested or made by
          Tenant to previously approved plans and specifications; (4)
          performance of work in the Premises by Tenant or Tenant's
          contractor(s) during the performance of the Landlord Work; or (5) if
          the performance of any portion of the Landlord Work depends on the
          prior or simultaneous performance of work by Tenant, a delay by Tenant
          or Tenant's contractor(s) in the completion of such work.

          If the Premises A Commencement Date, the Premises B Commencement Date
          or the Premises C Commencement Date does not occur by December 31,
          2000 (or such later date as the Premises A Commencement Date, Premises
          B Commencement Date or Premises C Commencement Date may be extended
          due to Tenant Delays and events of Force Majeure) (the "Outside
          Completion Date"), Landlord or Tenant, as their sole remedy, may
          terminate this Lease with respect to the applicable portion of the
          Premises (i.e. Premises A, Premises B or Premises C) the Term of which
          has not commenced as of the Outside Completion Date (the "Terminated
          Premises"), by giving the other party written notice of termination on
          or before 10 Business Days after the Outside Completion

                                       5
<PAGE>

          Date. In such event, the termination of this Lease with respect to the
          Terminated Premises shall be effective as of the date of the non-
          terminating party's receipt of such notice of termination. In the
          event that either Tenant or Landlord has so provided the termination
          notice, this Lease shall be deemed null and void and of no further
          force and effect with respect to the Terminated Premises and Landlord
          shall promptly refund any prepaid rent and Security Deposit previously
          advanced by Tenant under this Lease with respect to the Terminated
          Premises and, so long as Tenant has not previously defaulted under any
          of its obligations under the Work Letter beyond any applicable notice
          and cure period, the parties hereto shall have no further
          responsibilities or obligations to each other with respect to the
          Terminated Premises under this Lease. Landlord and Tenant acknowledge
          and agree that the determination of the Premises A Commencement Date,
          Premises B Commencement Date, Premises C Commencement Date and the
          Outside Completion Date shall take into consideration the effect of
          any Tenant Delays, and any events of Force Majeure. Notwithstanding
          anything herein to the contrary, if Landlord determines, that it will
          be unable to cause the Premises A Commencement Date, Premises B
          Commencement Date or Premises C Commencement Date to occur by the
          Outside Completion Date, Landlord shall have the right to immediately
          cease its performance of the Landlord Work with respect to such
          applicable portion of the Premises and provide Tenant with written
          notice (the "Outside Extension Notice") of such inability, which
          Outside Extension Notice shall set forth the date on which Landlord
          reasonably believes that the Premises A Commencement Date, Premises B
          Commencement Date or Premises C Commencement Date, as applicable, will
          occur. Upon receipt of the Outside Extension Notice, Tenant shall have
          the right to terminate this Lease with respect to such applicable
          portion of the Premises by providing written notice of termination to
          Landlord within 10 Business Days after the date of Tenant's receipt of
          the Outside Extension Notice. In the event Tenant so provides a
          written notice of termination, this Lease shall terminate with respect
          to such applicable portion of the Premises effective as of the date of
          Landlord's receipt of Tenant's notice of termination. In the event
          that Tenant does not terminate this Lease with respect to such
          applicable portion of the Premises within such 10 Business Day period,
          the Outside Completion Date with respect to such applicable portion of
          the Premises shall automatically be amended to be the date set forth
          in Landlord's Outside Extension Notice (subject to an ongoing right of
          the parties hereto to repeat this process in the event Tenant does not
          so terminate this Lease and Landlord subsequently determines that
          Landlord will be unable to cause the applicable Commencement Date to
          occur by the Outside Completion Date as extended).

     B.   Subject to Landlord's obligation, if any, to perform Landlord Work and
          Landlord's obligations under Section IX.B., the Premises are accepted
          by Tenant in "as is" condition and configuration. By taking possession
          of the Premises, Tenant agrees that the Premises are in good order and
          satisfactory condition, and that there are no representations or
          warranties by Landlord regarding the condition of the Premises or the
          Building.  If Landlord is delayed delivering possession of the
          Premises or any other space due to the holdover or unlawful possession
          of such space by any party, Landlord shall use reasonable efforts to
          obtain possession of the space.  Tenant's acceptance of the Premises
          shall be subject to Landlord's obligation to correct portions of the
          Landlord Work as set forth on a construction punch list prepared by
          Landlord and Tenant in accordance with the terms hereof.  Within 15
          days after the substantial completion of the Landlord Work with
          respect to each of Premises A, Premises B and Premises C, Landlord and
          Tenant shall together conduct an inspection of Premises A, Premises B
          or Premises C, as applicable, and prepare a "punch list" setting forth
          any portions of the Landlord Work that are not in conformity with the
          Landlord Work as required by the terms of this Lease.  Notwithstanding
          the foregoing, at the request of Landlord, such construction punch
          list shall be mutually prepared and executed by Landlord and Tenant
          prior to the date on which Tenant first begins to move its furniture,
          equipment or other personal property into Premises A, Premises B or
          Premises C, as applicable.  Landlord, as part of the Landlord Work,
          shall use good faith efforts to correct all such items within a
          reasonable time following the completion of the punch list.

                                       6
<PAGE>

     C.   If Tenant takes possession of Premises A before the Premises A
          Commencement Date, Premises B before the Premises B Commencement Date
          or Premises C before the Premises C Commencement Date, such possession
          shall be subject to the terms and conditions of this Lease and Tenant
          shall pay Rent (defined in Section IV.A.) to Landlord for each day of
          possession before the applicable Commencement Date.  However, except
          for the cost of services requested by Tenant or necessitated by
          Tenant's early entry (e.g. extra security personnel), Tenant shall not
          be required to pay Rent for any days of possession before the
          applicable Commencement Date during which Tenant, with the approval of
          Landlord, is in possession of the Premises for the sole purpose of
          performing improvements or installing furniture, equipment or other
          personal property.  Landlord shall use its reasonable efforts to
          provide Tenant with prior notice in the event Landlord shall charge
          Tenant for any such services.  In order to accommodate the completion
          of the installation of Tenant's cabling, telephone equipment and
          Tenant's furniture, fixtures and equipment by each applicable
          Commencement Date, Landlord shall use its good faith efforts to allow
          Tenant to enter the Premises prior to substantial completion of the
          Landlord Work in the Premises for such purposes, provided that any
          such early entry by Tenant shall not interfere with Landlord's
          completion of the Landlord Work, the construction of the Building or
          the construction of improvements to any other tenant's space in the
          Building.  Tenant's contractor(s) shall coordinate their early entry
          so as not to interfere with the Landlord Work in the Premises or the
          other construction work in the Building.  However, the foregoing shall
          not be deemed to be a representation or guaranty by Landlord that
          Tenant shall be permitted access to the Premises prior to any
          applicable Commencement Date and Landlord may terminate Tenant's right
          of entry into the Premises prior to any applicable Commencement Date
          at any time without any liability to Tenant for any loss or damage
          incurred by Tenant as a result thereof in the event Landlord
          reasonably determines that Tenant's continued presence in the Premises
          will materially interfere with the Landlord Work in the Premises or
          any other construction work in the Building.

IV.  Rent.

     A.   Payments. As consideration for this Lease, Tenant shall pay Landlord,
          --------
          without any setoff or deduction, the total amount of Base Rent and
          Additional Rent due for the Term. "Additional Rent" means all sums
          (exclusive of Base Rent) that Tenant is required to pay Landlord.
          Additional Rent and Base Rent are sometimes collectively referred to
          as "Rent". Tenant shall pay and be liable for all rental, sales and
          use taxes (but excluding income taxes), if any, imposed upon or
          measured by Rent under applicable Law.  Base Rent and recurring
          monthly charges of Additional Rent shall be due and payable in advance
          on the first day of each calendar month without notice or demand,
          provided that the installment of Base Rent for the first full calendar
          month of the Term shall be payable upon the execution of this Lease by
          Tenant.  All other items of Rent shall be due and payable by Tenant 30
          days after billing by Landlord.  All payments of Rent shall be by good
          and sufficient check or, at Tenant's election, by other means (such as
          automatic debit or electronic transfer) acceptable to Landlord.  If
          Tenant fails to pay any item or installment of Rent when due, Tenant
          shall pay Landlord an administration fee equal to 5% of the past due
          Rent, provided that Tenant shall be entitled to a grace period of 5
          Business Days for the first 2 late payments of Rent in a given
          calendar year. If the Term commences on a day other than the first day
          of a calendar month or terminates on a day other than the last day of
          a calendar month, the monthly Base Rent and Tenant's Pro Rata Share of
          any Tax Excess (defined in Section IV.B.) or Expense Excess (defined
          in Section IV.B.) for the month shall be prorated based on the number
          of days in such calendar month.  Landlord's acceptance of less than
          the correct amount of Rent shall be considered a payment on account of
          the earliest Rent due.  No endorsement or statement on a check or
          letter accompanying a check or payment shall be considered an accord
          and satisfaction, and either party may accept the check or payment
          without prejudice to that party's right to recover the balance or
          pursue other available remedies.  Tenant's covenant to pay Rent is
          independent of every other covenant in this Lease.

     B.   Expense Excess and Tax Excess. Tenant shall pay Tenant's Pro Rata
          ------------------------------
          Share of the amount, if any, by which Expenses (defined in Section
          IV.C.) for each

                                       7
<PAGE>

          calendar year during the Term exceed Expenses for the Base Year (the
          "Expense Excess") and also the amount, if any, by which Taxes (defined
          in Section IV.D.) for each calendar year during the Term exceed Taxes
          for the Base Year (the "Tax Excess"). If Expenses and/or Taxes in any
          calendar year decrease below the amount of Expenses and/or Taxes for
          the Base Year, Tenant's Pro Rata Share of Expenses and/or Taxes, as
          the case may be, for that calendar year shall be $0. Landlord shall
          provide Tenant with a good faith estimate of the Expense Excess and of
          the Tax Excess for each calendar year during the Term. On or before
          the first day of each month, Tenant shall pay to Landlord a monthly
          installment equal to one-twelfth of Tenant's Pro Rata Share of
          Landlord's estimate of the Expense Excess and one-twelfth of Tenant's
          Pro Rata Share of Landlord's estimate of the Tax Excess. If Landlord
          determines that its good faith estimate of the Expense Excess or of
          the Tax Excess was incorrect by a material amount, Landlord may
          provide Tenant with a revised estimate. After its receipt of the
          revised estimate, Tenant's monthly payments shall be based upon the
          revised estimate. If Landlord does not provide Tenant with an estimate
          of the Expense Excess or of the Tax Excess by January 1 of a calendar
          year, Tenant shall continue to pay monthly installments based on the
          previous year's estimate(s) until Landlord provides Tenant with the
          new estimate. Upon delivery of the new estimate, an adjustment shall
          be made for any month for which Tenant paid monthly installments based
          on the previous year's estimate(s). Tenant shall pay Landlord the
          amount of any underpayment within 30 days after receipt of the new
          estimate. Any overpayment shall be refunded to Tenant within 30 days
          or credited against the next due future installment(s) of Additional
          Rent.

          As soon as is practical following the end of each calendar year,
          Landlord shall furnish Tenant with a statement of the actual Expenses
          and Expense Excess and the actual Taxes and Tax Excess for the prior
          calendar year.  Landlord shall use reasonable efforts to furnish the
          statement of actual Expenses on or before June 1 of the calendar year
          immediately following the calendar year to which the statement
          applies.  If the estimated Expense Excess and/or estimated Tax Excess
          for the prior calendar year is more than the actual Expense Excess
          and/or actual Tax Excess, as the case may be, for the prior calendar
          year, Landlord shall apply any overpayment by Tenant against
          Additional Rent due or next becoming due, provided if the Term expires
          before the determination of the overpayment, Landlord shall promptly
          refund any overpayment to Tenant after first deducting the amount of
          Rent due.  If the estimated Expense Excess and/or estimated Tax Excess
          for the prior calendar year is less than the actual Expense Excess
          and/or actual Tax Excess, as the case may be, for such prior year,
          Tenant shall pay Landlord, within 30 days after its receipt of the
          statement of Expenses and/or Taxes, any underpayment for the prior
          calendar year.

     C.   Expenses Defined.  "Expenses" means all costs and expenses incurred in
          ----------------
          each calendar year in connection with operating, maintaining,
          repairing, and managing the Building and the Property, including, but
          not limited to:

          1.   Labor costs, including, wages, salaries, social security and
               employment taxes, medical and other types of insurance, uniforms,
               training, and retirement and pension plans.

          2.   Management fees, the cost of equipping and maintaining a
               management office, accounting and bookkeeping services, legal
               fees not attributable to leasing or collection activity, and
               other administrative costs.  Landlord, by itself or through an
               affiliate, shall have the right to directly perform or provide
               any services under this Lease (including management services),
               provided that the cost of any such services shall not exceed the
               cost that would have been incurred had Landlord entered into an
               arms-length contract for such services with an unaffiliated
               entity of comparable skill and experience.

          3.   The cost of services, including amounts paid to service providers
               and the rental and purchase cost of parts, supplies, tools and
               equipment.

          4.   Premiums and deductibles paid by Landlord for insurance,
               including workers compensation, fire and extended coverage,
               earthquake, general

                                       8
<PAGE>

               liability, rental loss, elevator, boiler and other insurance
               customarily carried from time to time by owners of comparable
               Class A office buildings.

          5.   Electrical Costs (defined below) and charges for water, gas,
               steam and sewer, but excluding those charges for which Landlord
               is reimbursed by tenants.  "Electrical Costs" means:  (a) charges
               paid by Landlord for electricity; (b) costs incurred in
               connection with an energy management program for the Property;
               and (c) if and to the extent permitted by Law, a fee for the
               services provided by Landlord in connection with the selection of
               utility companies and the negotiation and administration of
               contracts for electricity, provided that such fee shall not
               exceed 50% of any savings obtained by Landlord, and further
               provided that in no event shall Tenant pay more for electricity
               as a result of Landlord's negotiation and administration of
               contracts for electricity than Tenant would have paid had
               Landlord not negotiated and administered such contracts for
               electricity.  Electrical Costs shall be adjusted as follows:  (i)
               amounts received by Landlord as reimbursement for above standard
               electrical consumption shall be deducted from Electrical Costs;
               (ii) the cost of electricity incurred to provide overtime HVAC to
               specific tenants (as reasonably estimated by Landlord) shall be
               deducted from Electrical Costs; and (iii) if Tenant is billed
               directly for the cost of building standard electricity to the
               Premises as a separate charge in addition to Base Rent, the cost
               of electricity to individual tenant spaces in the Building shall
               be deducted from Electrical Costs.

          6.   The amortized cost of capital improvements (as distinguished from
               replacement parts or components installed in the ordinary course
               of business) made to the Property which are:  (a) performed
               primarily to reduce operating expense costs or otherwise improve
               the operating efficiency of the Property; or (b) required to
               comply with any Laws that are enacted, or first interpreted to
               apply to the Property, after the date of this Lease.  The cost of
               capital improvements shall be amortized by Landlord over the
               lesser of the Payback Period (defined below) or 5 years.  The
               amortized cost of capital improvements may,  at Landlord's
               option, include actual or imputed interest at the rate that
               Landlord would reasonably be required to pay to finance the cost
               of the capital improvement.  "Payback Period" means the
               reasonably estimated period of time that it takes for the cost
               savings resulting from a capital improvement to equal the total
               cost of the capital improvement.

          If Landlord incurs Expenses for the Property together with one or more
          other buildings or properties, whether pursuant to a reciprocal
          easement agreement, common area agreement or otherwise, the shared
          costs and expenses shall be equitably prorated and apportioned between
          the Property and the other buildings or properties.  Expenses shall
          not include: the cost of capital improvements (except as set forth
          above); depreciation; interest (except as provided above for the
          amortization of capital improvements); principal payments of mortgage
          and other non-operating debts of Landlord; ground lease rental; the
          cost of repairs or other work to the extent Landlord is reimbursed by
          insurance or condemnation proceeds; costs in connection with leasing
          space in the Building, including brokerage commissions; lease
          concessions, including rental abatements and construction allowances,
          granted to specific tenants; costs incurred in connection with the
          sale, financing or refinancing of the Building; fines, interest and
          penalties incurred due to the late payment of Taxes (defined in
          Section IV.D) or Expenses; organizational expenses associated with the
          creation and operation of the entity which constitutes Landlord;
          reserves not spent by Landlord by the end of the calendar year for
          which Expenses are paid; Landlord's costs of electricity and other
          services sold or provided to tenants in the Building and for which
          Landlord is entitled to be reimbursed by such tenants as a separate
          additional charge or rental over and above the base rent or additional
          rent payable under the lease with such tenant; costs incurred (less
          costs of recovery) for any items to the extent covered by a
          manufacturer's, materialman's, vendor's or contractor's warranty (a
          "Warranty") which are paid by such manufacturer, materialman, vendor
          or contractor (Landlord shall use reasonable efforts to pursue a
          warranty claim for

                                       9
<PAGE>

          items covered by a Warranty unless Landlord determines in good faith
          that such action would not be in the best interest of the Building);
          overhead and profit increment paid to subsidiaries or other affiliates
          of Landlord for services on or to the Property, Building and\or
          Premises to the extent only that the costs of such services exceed the
          competitive cost for such services rendered by persons or entities of
          similar skill, competence and experience; attorney's fees, costs and
          disbursements and other expenses incurred in connection with
          negotiations or disputes with tenants or other occupants of the
          Building or with prospective tenants (other than attorney's fees,
          costs and disbursements and other expenses incurred by Landlord in
          seeking to enforce Building rules and regulations); advertising and
          promotional expenditures; any costs, fines or penalties incurred due
          to violations by Landlord of any law, order, rule or regulations of
          any governmental authority which was in effect (and as enforced) as of
          the Lease Commencement Date except where such costs, fines or
          penalties are incurred by Landlord for violations of any such law,
          order, rule or regulation that is ultimately determined to be invalid,
          or inapplicable; payments for rented equipment, the cost of which
          would constitute a capital expenditure if the equipment were
          purchased, in which event, Section IV.C.6. above would govern the
          determination of whether such costs are included in Expenses; all
          costs of purchasing or leasing major sculptures, paintings or other
          major works or objects of art (as opposed to decorations purchased or
          leased by Landlord for display in the Common Areas of the Building);
          key man and other life insurance, long-term disability insurance and
          health, accident and sickness insurance, except only for group plans
          providing reasonable benefits to persons of the grade of building
          manager or general manager and below employed and engaged in operating
          and managing the Building; or any penalties or damages that Landlord
          pays to Tenant under this Lease or to other tenants in the Building
          under their respective leases. If the Building is not at least 95%
          occupied during any calendar year or if Landlord is not supplying
          services to at least 95% of the total Rentable Square Footage of the
          Building at any time during a calendar year, Expenses shall, at
          Landlord's option, be determined as if the Building had been 95%
          occupied and Landlord had been supplying services to 95% of the
          Rentable Square Footage of the Building during that calendar year. If
          Tenant pays for its Pro Rata Share of Expenses based on increases over
          a "Base Year" and Expenses for a calendar year are determined as
          provided in the prior sentence, Expenses for the Base Year shall also
          be determined as if the Building had been 95% occupied and Landlord
          had been supplying services to 95% of the Rentable Square Footage of
          the Building. The extrapolation of Expenses under this Section shall
          be performed by appropriately adjusting the cost of those components
          of Expenses that are impacted by changes in the occupancy of the
          Building.

     D.   Taxes Defined.  "Taxes" shall mean:  (1) all real estate taxes and
          --------------
          other assessments on the Building and/or Property, including, but not
          limited to, assessments for special improvement districts and building
          improvement districts, taxes and assessments levied in substitution or
          supplementation in whole or in part of any such taxes and assessments
          and the Property's share of any real estate taxes and assessments
          under any reciprocal easement agreement, common area agreement or
          similar agreement as to the Property; (2) all personal property taxes
          for property that is owned by Landlord and used in connection with the
          operation, maintenance and repair of the Property; and (3) all costs
          and fees incurred in connection with seeking reductions in any tax
          liabilities described in (1) and (2), including, without limitation,
          any costs incurred by Landlord for compliance, review and appeal of
          tax liabilities.  Without limitation, Taxes shall not include any
          income, capital levy, franchise, capital stock, gift, estate or
          inheritance tax.  If an assessment is payable in installments, Taxes
          for the year shall include the amount of the installment and any
          interest due and payable during that year.  For all other real estate
          taxes, Taxes for that year shall, at Landlord's election, include
          either the amount accrued, assessed or otherwise imposed for the year
          or the amount due and payable for that year, provided that Landlord's
          election shall be applied consistently throughout the Term.  If a
          change in Taxes is obtained for any year of the Term during which
          Tenant paid Tenant's Pro Rata Share of any Tax Excess, then Taxes for
          that year will be retroactively adjusted and Landlord shall provide
          Tenant with a credit, if any, based on the adjustment.  Likewise, if a
          change is obtained for Taxes for the Base Year, Taxes for the Base
          Year shall be restated and the Tax Excess for all

                                      10
<PAGE>

          subsequent years shall be recomputed. Tenant shall pay Landlord the
          amount of Tenant's Pro Rata Share of any such increase in the Tax
          Excess within 30 days after Tenant's receipt of a statement from
          Landlord.

     E.   Tenant shall be responsible for, and shall pay prior to delinquency,
          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, and 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 prior to the delinquency of such taxes.  In the event that
          the tenant improvements in the Building which correspond to the
          Landlord Work, as defined in this Lease, are assessed and taxed
          separately by the applicable taxing authority, then Tenant shall be
          liable and shall pay that portion of the Taxes applicable to the value
          of the Landlord Work in the Premises which is in excess of $35.00 per
          rentable square foot of the Premises based on the value attributed
          thereto by the applicable taxing authority to either (a) the
          applicable taxing authority prior to the delinquency of such taxes in
          the event Tenant is billed directly by such taxing authority, or (b)
          the Landlord within 30 days after written demand, in the event
          Landlord is billed directly by the applicable taxing authority.

     F.   Audit Rights.  Tenant may, within 180 days after receiving Landlord's
          ------------
          statement of Expenses, give Landlord written notice ("Review Notice")
          that Tenant intends to review Landlord's records of the Expenses for
          that calendar year.  Within a reasonable time after receipt of the
          Review Notice, Landlord shall make all pertinent records available for
          inspection that are reasonably necessary for Tenant to conduct its
          review.  If any records are maintained at a location other than the
          office of the Building, Tenant may either inspect the records at such
          other location or pay for the reasonable cost of copying and shipping
          the records.  If Tenant retains an agent to review Landlord's records,
          the agent must be with a licensed CPA.  Tenant shall be solely
          responsible for all costs, expenses and fees incurred for the audit.
          Within 60 days after the records are made available to Tenant, Tenant
          shall have the right to give Landlord written notice (an "Objection
          Notice") stating in reasonable detail any objection to Landlord's
          statement of Expenses for that year.  If Tenant fails to give Landlord
          an Objection Notice within the 60 day period or fails to provide
          Landlord with a Review Notice within the 180 day period described
          above, Tenant shall be deemed to have approved Landlord's statement of
          Expenses and shall be barred from raising any claims regarding the
          Expenses for that year.  If Tenant provides Landlord with a timely
          Objection Notice, Landlord and Tenant shall work together in good
          faith to resolve any issues raised in Tenant's Objection Notice.  If
          Landlord and Tenant determine that Expenses for the calendar year are
          less than reported, Landlord shall provide Tenant with a credit
          against the next installment of Rent in the amount of the overpayment
          by Tenant.  Likewise, if Landlord and Tenant determine that Expenses
          for the calendar year are greater than reported, Tenant shall pay
          Landlord the amount of any underpayment within 30 days.  In addition,
          if Landlord and Tenant determine that Expenses for the Building for
          the year in question were less than stated by more than 5%, Landlord,
          within 30 days after its receipt of paid invoices therefor from
          Tenant, shall reimburse Tenant for any reasonable amounts paid by
          Tenant to third parties in connection with such review by Tenant.  The
          records obtained by Tenant shall be treated as confidential.  In no
          event shall Tenant be permitted to examine Landlord's records or to
          dispute any statement of Expenses unless Tenant has paid and continues
          to pay all Rent when due.

V.   Compliance with Laws; Use.

     The Premises shall be used only for the Permitted Use and for no other use
whatsoever.  Tenant shall not use or permit the use of the Premises for any
purpose which is illegal, dangerous to persons or property or which, in
Landlord's reasonable opinion, unreasonably disturbs any other tenants of the
Building or interferes with the operation of the Building.  Tenant shall comply
with all Laws, including the Americans with Disabilities Act, regarding the
operation of Tenant's business and the use, condition, configuration and
occupancy of the Premises.  Tenant, within 10 Business Days after receipt, shall
provide Landlord with copies of any notices it receives regarding a violation or
alleged violation of any Laws.  Except to the extent properly

                                      11
<PAGE>

included in Expenses, Landlord shall be responsible for the cost of correcting
any violations of Title III of the Americans with Disabilities Act (ADA) with
respect to the Common Areas of the Building. Notwithstanding the foregoing,
Landlord shall have the right to contest any alleged violation in good faith,
including, without limitation, the right to apply for and obtain a waiver or
deferment of compliance, the right to assert any and all defenses allowed by law
and the right to appeal any decisions, judgments or rulings to the fullest
extent permitted by law. Landlord, after the exhaustion of any and all rights to
appeal or contest, will make all repairs, additions, alterations or improvements
necessary to comply with the terms of any final order or judgment. Tenant shall
comply with the rules and regulations of the Building attached as Exhibit B and
such other reasonable rules and regulations adopted by Landlord from time to
time. Tenant shall also cause its agents, contractors, subcontractors,
employees, customers, and subtenants to comply with all rules and regulations.
Landlord shall not knowingly discriminate against Tenant in Landlord's
enforcement of the rules and regulations.

VI.  Security Deposit.

     A.   The Security Deposit shall be in the form of an irrevocable letter of
          credit (the "Letter of Credit") which shall: (a) be in the amount of
          $3,000,000.00; (b) be issued on the form attached hereto as Exhibit G;
          (c) name Landlord as its beneficiary; (d) be drawn on an FDIC insured
          financial institution satisfactory to Landlord; and (e) expire no
          earlier than 60 days after the Termination Date of this Lease. The
          Security Deposit shall be delivered to Landlord within 45 days after
          the execution of this Lease by Tenant and shall be held by Landlord
          without liability for interest (unless required by Law) as security
          for the performance of Tenant's obligations. The Security Deposit is
          not an advance payment of Rent or a measure of Tenant's liability for
          damages. Landlord may, from time to time, without prejudice to any
          other remedy, use all or a portion of the Security Deposit to satisfy
          past due Rent or to cure any uncured default by Tenant. If Landlord
          uses the Security Deposit, Tenant shall on demand restore the Security
          Deposit to its original amount. Landlord shall return any unapplied
          portion of the Security Deposit to Tenant within 45 days after the
          later to occur of: (1) the determination of Tenant's Pro Rata Share of
          any Tax Excess and Expense Excess for the final year of the Term; (2)
          the date Tenant surrenders possession of the Premises to Landlord in
          accordance with this Lease; or (3) the Termination Date. If Landlord
          transfers its interest in the Premises, Landlord may assign the
          Security Deposit to the transferee and, following the assignment,
          Landlord shall have no further liability for the return of the
          Security Deposit. Landlord shall not be required to keep the Security
          Deposit separate from its other accounts.

     B.   Notwithstanding anything herein to the contrary, provided (1) Tenant
          is not in default under this Lease, and (2) Tenant's then-applicable
          current ratio (as determined in accordance with generally acceptable
          accounting principles) is greater than or equal to 1.75 and Tenant's
          then-applicable return on equity (as determined in accordance with
          generally acceptable accounting principles) is greater than or equal
          to 13% (the "Benchmarks"), as evidenced by Tenant's audited financial
          statements delivered by Tenant to Landlord and prepared by an
          independent CPA for the most recent calendar year, Tenant shall have
          the right to reduce the amount of the Security Deposit (i.e., the
          Letter of Credit) by $375,000.00 on each anniversary of the
          Commencement Date that Tenant has successfully met the Benchmarks.
          Such reduction shall be accomplished by having Tenant provide Landlord
          with a substitute Letter of Credit in the form of the letter of credit
          attached hereto as Exhibit G in the reduced amount.  Notwithstanding
          the foregoing to the contrary, Landlord agrees that Tenant may
          extinguish the Letter of Credit in the event Tenant's net equity, as
          evidenced by Tenant's audited financial statements delivered by Tenant
          to Landlord and prepared by an independent CPA for the most recent
          calendar year, is at any time greater than or equal to One Billion
          Dollars ($1,000,000,000.00).  For purposes of this Article VI,
          Tenant's net equity shall be defined to mean the amount determined by
          subtracting Tenant's total liabilities from Tenant's total assets.

VII. Services to be Furnished by Landlord.

     A.   Landlord agrees to furnish Tenant with the following services: (1)
          Water and sewer service for use in the lavatories on each floor on
          which the Premises are

                                      12
<PAGE>

          located; (2) Heat and air conditioning in season during Normal
          Business Hours, at such temperatures and in such amounts as may be
          required by governmental authority or as are standard for comparable
          high-rise office buildings in the San Francisco Financial District of
          a Class A character which are perceived in the marketplace to be
          similar to the Property, taking into account the size, age, quality of
          construction and location, as such market perception may change over
          time, depending upon future development in downtown San Francisco.
          Landlord shall provide heating and air conditioning based on the
          ASHRAE 55 standards established by the American Society of Heating,
          Refrigeration and Air Conditioning Engineers. Tenant, upon such
          advance notice as is reasonably required by Landlord, shall have the
          right to receive HVAC service during hours other than Normal Business
          Hours. Tenant shall pay Landlord the standard charge for the
          additional service as reasonably determined by Landlord from time to
          time. As of the date hereof, Landlord's charge for after hours
          ventilation service is $35.00 per hour, per floor and Landlord's
          charge for after hours air conditioning service is $55.00 per hour,
          per floor, subject to change; (3) Maintenance and repair of the
          Property as described in Section IX.B.; (4) Janitor service on
          Business Days. If Tenant's use, floor covering or other improvements
          require special services in excess of the standard services for the
          Building, Tenant shall pay the additional cost attributable to the
          special services. Upon request by Tenant, Landlord shall provide
          Tenant with Landlord's then-current janitorial specifications for the
          Building, subject to change; (5) Elevator service; (6) Electricity to
          the Premises for general office use, in accordance with and subject to
          the terms and conditions in Article X; (7) Tenant's allocable share of
          cooled condenser water circulating in the Building 24 hours a day, 7
          days a week, subject to the terms of this Lease (including, but not
          limited to, Landlord's right to interrupt the operation of the cooled
          condenser water system from time to time to make repairs, upgrades,
          etc., provided that except in the event of an emergency, Landlord
          shall use its good faith, reasonable efforts to provide Tenant with
          reasonable notice prior to interrupting such cooled condenser water
          services); (8) Access to the Building for Tenant and its employees 24
          hours a day, 7 days a week, subject to the terms of this Lease and
          such security or monitoring systems as Landlord may reasonably impose,
          including, without limitation, sign-in procedures and/or presentation
          of identification cards; and (9) such other services as Landlord
          reasonably determines are necessary or appropriate for the Property.
          Tenant expressly acknowledges that if Landlord, from time to time,
          elects to provide security services, Landlord shall not be deemed to
          have warranted the efficiency of any security personnel, service,
          procedures or equipment and Landlord shall not be liable in any manner
          for the failure of any such security personnel, services, procedures
          or equipment to prevent or control, or apprehend anyone suspected of
          personal injury, property damage or any criminal conduct in, on or
          around the Property. As of the Commencement Date of the Lease,
          Landlord will provide security at the Building on a 24-hour per day,
          7-day per week basis such that the security post on the ground floor
          of the Building shall be occupied at all times (except in the event of
          an emergency). The preceding sentence shall not be deemed to be a
          representation by Landlord that Landlord shall continuously maintain
          security services at the same level throughout the Term of this Lease
          (or that Landlord shall provide any security services at all during
          the Term of this Lease), and Landlord shall have the right, at
          Landlord's sole discretion, to increase, decrease, eliminate or
          otherwise modify the amount and/or type of security services provided
          to the Property, provided that the level of security provided by
          Landlord at the Building shall be consistent with the level of
          security provided at comparable Class A buildings in the downtown San
          Francisco, California area. The cost of any security services provided
          by Landlord for the benefit of the Property shall be included as a
          part of Expenses.

     B.   Landlord's failure to furnish, or any interruption or termination of,
          services due to the application of Laws, the failure of any equipment,
          the performance of repairs, improvements or alterations, or the
          occurrence of any event or cause beyond the reasonable control of
          Landlord (a "Service Failure") shall not render Landlord liable to
          Tenant, constitute a constructive eviction of Tenant, give rise to an
          abatement of Rent, nor relieve Tenant from the obligation to fulfill
          any covenant or agreement. However, if the Premises, or a material
          portion of the Premises, is made untenantable for a period in excess
          of 3 consecutive Business Days as a

                                      13
<PAGE>

          result of the Service Failure, then Tenant, as its sole remedy, shall
          be entitled to receive an abatement of Rent payable hereunder during
          the period beginning on the 4th consecutive Business Day of the
          Service Failure and ending on the day the service has been restored.
          If the entire Premises has not been rendered untenantable by the
          Service Failure, the amount of abatement that Tenant is entitled to
          receive shall be prorated based upon the percentage of the Premises
          rendered untenantable and not used by Tenant. In no event, however,
          shall Landlord be liable to Tenant for any loss or damage, including
          the theft of Tenant's Property (defined in Article XV), arising out of
          or in connection with the failure of any security services, personnel
          or equipment.

VIII.  Leasehold Improvements.

       All improvements to the Premises (collectively, "Leasehold Improvements")
shall be owned by Landlord and shall remain upon the Premises without
compensation to Tenant. However, Landlord, by written notice to Tenant within 30
days prior to the Termination Date, may require Tenant to remove, at Tenant's
expense: (1) Cable (defined in Section IX.A) installed by or for the exclusive
benefit of Tenant and located in the Premises or other portions of the Building;
and (2) any Leasehold Improvements that are performed by or for the benefit of
Tenant and, in Landlord's reasonable judgment, are of a nature that would
require removal and repair costs that are materially in excess of the removal
and repair costs associated with standard office improvements (collectively
referred to as "Required Removables"). Without limitation, it is agreed that
Required Removables include internal stairways, raised floors, personal baths
and showers, vaults, rolling file systems and structural alterations and
modifications of any type. The Required Removables designated by Landlord shall
be removed by Tenant before the Termination Date, provided that upon prior
written notice to Landlord, Tenant may remain in the Premises for up to 5
Business Days after the Termination Date for the sole purpose of removing the
Required Removables. In addition to the foregoing, in the event Tenant elects to
reallocate the condenser water among the floors of the Premises as permitted
pursuant to Exhibit D-1 attached hereto, then in the event of (i) the
termination of this Lease, (ii) a reduction or partial termination of all or a
part of the Premises, or (iii) a sublease of all or a part of the Premises,
Landlord may require Tenant, at Tenant's sole cost and expense, to reallocate
the condenser water so that each floor receives its proper pro rata share of
chilled water. Any such work required by Landlord shall also be deemed to be a
Required Removable for purposes of this Lease and, in the case of a reduction or
partial termination of all or a part of the Premises, or of a sublease, such
required work shall be performed by Tenant prior to the effective date of such
reduction, partial termination or sublease. Tenant's possession of the Premises
shall be subject to all of the terms and conditions of this Lease, including the
obligation to pay Rent on a per diem basis at the rate in effect for the last
month of the Term. Tenant shall repair damage caused by the installation or
removal of Required Removables. If Tenant fails to remove any Required
Removables or perform related repairs in a timely manner, Landlord, at Tenant's
expense, may remove and dispose of the Required Removables and perform the
required repairs. Tenant, within 30 days after receipt of an invoice, shall
reimburse Landlord for the reasonable costs incurred by Landlord.
Notwithstanding the foregoing, Tenant, at the time it requests approval for a
proposed Alteration (defined in Section IX.C), or at the time it delivers the
final approved Plans for the Landlord Work to Landlord, may request in writing
that Landlord advise Tenant whether the Alteration or the Landlord Work, as the
case may be, or any portion of the Alteration or the Landlord Work, as the case
may be, will be designated as a Required Removable. Within 10 Business Days
after receipt of Tenant's request, Landlord shall advise Tenant in writing as to
which portions of the Alteration or the Landlord Work, as the case may be, if
any, will be considered to be Required Removables.

IX.    Repairs and Alterations.

       A. Tenant's Repair Obligations.  Tenant shall, at its sole cost and
          ---------------------------
          expense, promptly perform all maintenance and repairs to the Premises
          that are not Landlord's express responsibility under this Lease, and
          shall keep the Premises in good condition and repair, reasonable wear
          and tear excepted. Tenant's repair obligations include, without
          limitation, repairs to: (1) floor covering; (2) interior partitions;
          (3) doors; (4) the interior side of demising walls; (5) electronic,
          phone and data cabling and related equipment (collectively, "Cable")
          that is installed by or for the exclusive benefit of Tenant and
          located in the Premises or other portions of the Building; (6)
          supplemental air conditioning units, private showers and kitchens,
          including hot water heaters, plumbing, and similar facilities serving
          Tenant exclusively; and (7) Alterations performed by contractors
          retained by

                                      14
<PAGE>

          Tenant, including related HVAC balancing. All work shall be performed
          in accordance with the rules and procedures described in Section IX.C.
          below. If Tenant fails to make any repairs to the Premises for more
          than 15 Business Days after notice from Landlord (although notice
          shall not be required if there is an emergency), Landlord may make the
          repairs, and Tenant shall pay the reasonable cost of the repairs to
          Landlord within 30 days after receipt of an invoice, together with an
          administrative charge in an amount equal to 10% of the cost of the
          repairs.

     B.   Landlord's Repair Obligations. Landlord shall keep and maintain in
          ------------------------------
          good repair and working order and make repairs to and perform
          maintenance upon: (1) structural elements of the Building; (2)
          mechanical (including HVAC and condenser water system), electrical,
          plumbing, security (if any) and fire/life safety systems serving the
          Building in general; (3) Common Areas; (4) the roof of the Building;
          (5) exterior windows of the Building; and (6) elevators serving the
          Building. Landlord shall promptly make repairs (considering the nature
          and urgency of the repair) for which Landlord is responsible.  If
          Tenant's use, or if Tenant's non-building standard improvements
          (including but not limited to any ambient lighting installed by or for
          the benefit of Tenant) require extra maintenance or repair services in
          excess of the standard maintenance or repair services provided by
          Landlord for the Building, Tenant shall pay the additional costs
          attributable to such above-standard services.

     C.   Alterations.  Tenant shall not make alterations, additions or
          ------------
          improvements to the Premises or install any Cable in the Premises or
          other portions of the Building (collectively referred to as
          "Alterations") without first obtaining the written consent of Landlord
          in each instance, which consent shall not be unreasonably withheld,
          conditioned or delayed. However, Landlord's consent shall not be
          required for any Alteration that satisfies all of the following
          criteria (a "Cosmetic Alteration"):  (1) is of a cosmetic nature such
          as painting, wallpapering, hanging pictures and installing carpeting;
          (2) is not visible from the exterior of the Premises or Building; (3)
          will not affect the systems or structure of the Building; and (4) does
          not require work to be performed inside the walls or above the ceiling
          of the Premises.  However, even though consent is not required, the
          performance of Cosmetic Alterations shall be subject to all the other
          provisions of this Section IX.C.  Prior to starting work, Tenant shall
          furnish Landlord with plans and specifications reasonably acceptable
          to Landlord; names of contractors reasonably acceptable to Landlord
          (provided that Landlord may designate specific contractors with
          respect to Building systems); copies of contracts; necessary permits
          and approvals; evidence of contractor's and subcontractor's insurance
          in amounts reasonably required by Landlord; and any security for
          performance that is reasonably required by Landlord.  Changes to the
          plans and specifications must also be submitted to Landlord for its
          approval.  Alterations shall be constructed in a good and workmanlike
          manner using materials of a quality that is at least equal to the
          quality designated by Landlord as the minimum standard for the
          Building.  Landlord may designate reasonable rules, regulations and
          procedures for the performance of work in the Building and, to the
          extent reasonably necessary to avoid disruption to the occupants of
          the Building, shall have the right to designate the time when
          Alterations may be performed.  Tenant shall reimburse Landlord within
          30 days after receipt of an invoice for reasonable sums paid by
          Landlord for third party examination of Tenant's plans for non-
          Cosmetic Alterations.  In addition, within 30 days after receipt of an
          invoice from Landlord, Tenant shall pay Landlord a fee for Landlord's
          oversight and coordination of any non-Cosmetic Alterations equal to 7%
          of the cost of the non-Cosmetic Alterations.  Upon completion, Tenant
          shall furnish "as-built" plans (except for Cosmetic Alterations),
          completion affidavits, full and final waivers of lien in recordable
          form, and receipted bills covering all labor and materials.  Tenant
          shall assure that the Alterations comply with all insurance
          requirements and Laws.  Landlord's approval of an Alteration shall not
          be a representation by Landlord that the Alteration complies with
          applicable Laws or will be adequate for Tenant's use.

X.   Use of Electrical Services by Tenant.

     A.   Electricity used by Tenant in the Premises shall, at Landlord's
          option, be paid for by Tenant either:  (1) through inclusion in
          Expenses (except as provided in

                                      15
<PAGE>

          Section X.B. for excess usage); (2) by a separate charge payable by
          Tenant to Landlord within 30 days after billing by Landlord; or (3) by
          separate charge billed by the applicable utility company and payable
          directly by Tenant. Electrical service to the Premises may be
          furnished by one or more companies providing electrical generation,
          transmission and distribution services, and the cost of electricity
          may consist of several different components or separate charges for
          such services, such as generation, distribution and stranded cost
          charges. Landlord shall have the exclusive right to select any company
          providing electrical service to the Premises, to aggregate the
          electrical service for the Property and Premises with other buildings,
          to purchase electricity through a broker and/or buyers group and to
          change the providers and manner of purchasing electricity. Landlord
          shall be entitled to receive a fee (if permitted by Law) for the
          selection of utility companies and the negotiation and administration
          of contracts for electricity, provided that the amount of such fee
          shall not exceed 50% of any savings obtained by Landlord, and further
          provided that in no event shall Tenant pay more for electricity as a
          result of Landlord's negotiation and administration of contracts for
          electricity than Tenant would have paid had Landlord not negotiated
          and administered such contracts for electricity.

     B.   Tenant's use of electrical service shall not exceed, either in
          voltage, rated capacity or overall load, that which Landlord deems to
          be standard for the Building. Standard electrical use for the Building
          is deemed to be 1 kilowatt hour per rentable square foot, per month,
          including lighting. If Tenant requests permission to consume excess
          electrical service, Landlord may refuse to consent or may condition
          consent upon conditions that Landlord reasonably elects (including,
          without limitation, the installation of utility service upgrades,
          meters, submeters, air handlers or cooling units), and the additional
          usage (to the extent permitted by Law), installation and maintenance
          costs shall be paid by Tenant. Landlord shall have the right to
          separately meter electrical usage for the Premises and to measure
          electrical usage by survey or other commonly accepted methods.

XI.  Entry by Landlord.

     Landlord, its agents, contractors and representatives may enter the
Premises to inspect or show the Premises, to clean and make repairs, alterations
or additions to the Premises, and to conduct or facilitate repairs, alterations
or additions to any portion of the Building, including other tenants' premises.
Except in emergencies or to provide janitorial and other Building services after
Normal Business Hours, Tenant shall have the right to have a representative of
Tenant accompany Landlord during Landlord's entry into the Premises.  Except in
emergencies or to provide janitorial and other Building services after Normal
Business Hours, Landlord shall provide Tenant with reasonable prior notice of
entry into the Premises, which may be given orally.  If reasonably necessary for
the protection and safety of Tenant and its employees, Landlord shall have the
right to temporarily close all or a portion of the Premises to perform repairs,
alterations and additions.  However, except in emergencies, Landlord will not
close the Premises if the work can reasonably be completed on weekends and after
Normal Business Hours.  Entry by Landlord shall not constitute constructive
eviction or entitle Tenant to an abatement or reduction of Rent.
Notwithstanding the foregoing, except in emergency situations as determined by
Landlord, Landlord shall exercise reasonable efforts to perform any entry into
the Premises in a manner that is reasonably designed to minimize interference
with the operation of Tenant's business in the Premises.

XII. Assignment and Subletting.

     A.   Except in connection with a Permitted Transfer (defined in Section
          XII.E. below), Tenant shall not assign, sublease, transfer or encumber
          any interest in this Lease or allow any third party to use any portion
          of the Premises (collectively or individually, a "Transfer") without
          the prior written consent of Landlord, which consent shall not be
          unreasonably withheld, conditioned or delayed if Landlord does not
          elect to exercise its termination rights under Section XII.B below.
          Without limitation, it is agreed that Landlord's consent shall not be
          considered unreasonably withheld if:  (1) the proposed transferee's
          financial condition does not meet the criteria Landlord uses to select
          Building tenants having similar leasehold obligations; (2) the
          proposed transferee's business is not suitable for the Building
          considering the business of the other tenants and the Building's

                                      16
<PAGE>

          prestige, or would result in a violation of another tenant's pre-
          existing rights; (3) the proposed transferee is a governmental agency
          or occupant of the Building (provided that Landlord will not withhold
          its consent solely because the transferee is a government agency if
          the Transfer would not impose any additional obligations on Landlord
          or result in an excessive amount of foot traffic to and from the
          Premises or an excessive amount of people per square foot within the
          Premises); (4) Tenant is in default after the expiration of the notice
          and cure periods in this Lease; or (5) any portion of the Building or
          Premises would likely become subject to additional or different Laws
          as a consequence of the proposed Transfer.  Notwithstanding the
          foregoing, Landlord will not withhold its consent solely because the
          proposed subtenant or assignee is an occupant of the Building if
          Landlord does not have space available for lease in the Building that
          is comparable to the space Tenant desires to sublet or assign.  For
          purposes hereof, Landlord shall be deemed to have comparable space if
          it has space available on any floor of the Building that is
          approximately the same size as the space Tenant desires to sublet or
          assign within six (6) months of the proposed commencement of the
          proposed sublease or assignment.  Tenant shall not be entitled to
          receive monetary damages based upon a claim that Landlord unreasonably
          withheld its consent to a proposed Transfer and Tenant's sole remedy
          shall be an action to enforce any such provision through specific
          performance or declaratory judgment.  Any attempted Transfer in
          violation of this Article shall, at Landlord's option, be void.
          Consent by Landlord to one or more Transfer(s) shall not operate as a
          waiver of Landlord's rights to approve any subsequent Transfers. In no
          event shall any Transfer or Permitted Transfer release or relieve
          Tenant from any obligation under this Lease.

     B.   As part of its request for Landlord's consent to a Transfer, Tenant
          shall provide Landlord with financial statements for the proposed
          transferee, a complete copy of the proposed assignment, sublease and
          other contractual documents and such other information as Landlord may
          reasonably request.  Landlord shall, by written notice to Tenant
          within 30 days of its receipt of the required information and
          documentation, either: (1) consent to the Transfer by the execution of
          a consent agreement in a form reasonably designated by Landlord or
          reasonably refuse to consent to the Transfer in writing; or (2) in the
          case of (i) an assignment of this Lease, or (ii) a subletting which
          would (a) result in 75% or more of the Premises in the aggregate being
          sublet for any portion of the Term of this Lease, and/or (b) result in
          the sublease of all or a portion of the Premises for more than 75% of
          the then remaining Term of this Lease, exercise its right to terminate
          this Lease with respect to the portion of the Premises that Tenant is
          proposing to assign or sublet.  Any such termination shall be
          effective on the proposed effective date of the Transfer for which
          Tenant requested consent.  Tenant shall pay Landlord a review fee of
          $750.00 for Landlord's review of any Permitted Transfer or requested
          Transfer, provided if Landlord's actual reasonable costs and expenses
          (including reasonable attorney's fees) exceed $750.00, Tenant shall
          reimburse Landlord for its actual reasonable costs and expenses in
          lieu of a fixed review fee.

     C.   Tenant shall pay Landlord 65% of all rent and other consideration
          which Tenant receives as a result of a Transfer that is in excess of
          the Rent payable to Landlord for the portion of the Premises and Term
          covered by the Transfer.  Tenant shall pay Landlord for Landlord's
          share of any excess within 30 days after Tenant's receipt of such
          excess consideration.  Tenant may deduct from the excess all
          reasonable and customary expenses directly incurred by Tenant
          attributable to the Transfer (other than Landlord's review fee),
          including brokerage fees, legal fees and construction costs.  If
          Tenant is in Monetary Default (defined in Section XIX.A. below),
          Landlord may require that all sublease payments be made directly to
          Landlord, in which case Tenant shall receive a credit against Rent in
          the amount of any payments received (less Landlord's share of any
          excess).

     D.   Except as provided below with respect to a Permitted Transfer, if
          Tenant is a corporation, limited liability company, partnership, or
          similar entity, and if the entity which owns or controls a majority of
          the voting shares/rights at any time changes for any reason (including
          but not limited to a merger, consolidation or reorganization), such
          change of ownership or control shall constitute a Transfer.  The
          foregoing shall not apply so long as Tenant is an entity whose
          outstanding

                                      17
<PAGE>

          stock is listed on a recognized security exchange, or if at least 80%
          of its voting stock is owned by another entity, the voting stock of
          which is so listed.

       E. Tenant may assign its entire interest under this Lease to a successor
          to Tenant by purchase, merger, consolidation or reorganization without
          the consent of Landlord, provided that all of the following conditions
          are satisfied  (a "Permitted Transfer"):  (1) Tenant is not in default
          under this Lease; (2) Tenant's successor shall own all or
          substantially all of the assets of Tenant; (3) Tenant's successor
          shall have a net worth which is at least equal to the greater of
          Tenant's net worth at the date of this Lease or Tenant's net worth as
          of the day prior to the proposed purchase, merger, consolidation or
          reorganization; (4) the Permitted Use does not allow the Premises to
          be used for retail purposes; and (5) Tenant shall give Landlord
          written notice at least 30 days prior to the effective date of the
          proposed purchase, merger, consolidation or reorganization. Tenant's
          notice to Landlord shall include information and documentation showing
          that each of the above conditions has been satisfied.  If requested by
          Landlord, Tenant's successor shall sign a commercially reasonable form
          of assumption agreement.

XIII.  Liens.

       Tenant shall not permit mechanic's or other liens to be placed upon the
Property, Premises or Tenant's leasehold interest in connection with any work or
service done or purportedly done by or for benefit of Tenant.  If a lien is so
placed, Tenant shall, within 10 Business Days of notice from Landlord of the
filing of the lien, fully discharge the lien by settling the claim which
resulted in the lien or by bonding or insuring over the lien in the manner
prescribed by the applicable lien Law.  If Tenant fails to discharge the lien,
then, in addition to any other right or remedy of Landlord, Landlord may bond or
insure over the lien or otherwise discharge the lien.  Tenant shall reimburse
Landlord for any amount paid by Landlord to bond or insure over the lien or
discharge the lien, including, without limitation, reasonable attorneys' fees
(if and to the extent permitted by Law) within 30 days after receipt of an
invoice from Landlord.

XIV.   Indemnity and Waiver of Claims.

       A. Except to the extent caused by the negligence or willful misconduct of
          Landlord or any Landlord Related Parties (defined below), Tenant shall
          indemnify, defend and hold Landlord, its trustees, members,
          principals, beneficiaries, partners, officers, directors, employees,
          Mortgagee(s) (defined in Article XXVI) and agents ("Landlord Related
          Parties") harmless against and from all liabilities, obligations,
          damages, penalties, claims, actions, costs, charges and expenses,
          including, without limitation, reasonable attorneys' fees and other
          professional fees (if and to the extent permitted by Law), which may
          be imposed upon, incurred by or asserted against Landlord or any of
          the Landlord Related Parties and arising out of or in connection with
          any damage or injury occurring in the Premises or any acts or
          omissions (including violations of Law) of Tenant, the Tenant Related
          Parties (defined below) or any of Tenant's transferees, contractors or
          licensees.

       B. Except to the extent caused by the negligence or willful misconduct of
          Tenant or any Tenant Related Parties (defined below), Landlord shall
          indemnify, defend and hold Tenant, its trustees, members, principals,
          beneficiaries, partners, officers, directors, employees and agents
          ("Tenant Related Parties") harmless against and from all liabilities,
          obligations, damages, penalties, claims, actions, costs, charges and
          expenses, including, without limitation, reasonable attorneys' fees
          and other professional fees (if and to the extent permitted by Law),
          which may be imposed upon, incurred by or asserted against Tenant or
          any of the Tenant Related Parties and arising out of or in connection
          with the acts or omissions (including violations of Law) of Landlord,
          the Landlord Related Parties or any of Landlord's contractors.

       C. Landlord and the Landlord Related Parties shall not be liable for, and
          Tenant waives, all claims for loss or damage to Tenant's business or
          loss, theft or damage to Tenant's Property or the property of any
          person claiming by, through or under Tenant resulting from: (1) wind
          or weather; (2) the failure of any sprinkler, heating or air-
          conditioning equipment, any electric wiring or any gas, water or steam
          pipes; (3) the backing up of any sewer pipe or downspout; (4) the
          bursting, leaking or running of any tank, water closet, drain or other
          pipe;

                                      18
<PAGE>

          (5) water, snow or ice upon or coming through the roof, skylight,
          stairs, doorways, windows, walks or any other place upon or near the
          Building; (6) any act or omission of any party other than Landlord or
          Landlord Related Parties; and (7) any causes not reasonably within the
          control of Landlord. Tenant shall insure itself against such losses
          under Article XV below. Notwithstanding the foregoing, except as
          provided in Article XVI to the contrary, Tenant shall not be required
          to waive any claims against Landlord (other than for loss or damage to
          Tenant's business) where such loss or damage is due to Landlord's
          negligence. Nothing herein shall be construed as to diminish the
          repair and maintenance obligations of Landlord contained elsewhere in
          this Lease.

XV.   Insurance.

      Tenant shall carry and maintain the following insurance ("Tenant's
Insurance"), at its sole cost and expense:  (1) Commercial General Liability
Insurance applicable to the Premises and its appurtenances providing, on an
occurrence basis, a minimum combined single limit of $2,000,000.00; (2) All Risk
Property/Business Interruption Insurance, including flood and earthquake,
written at replacement cost value and with a replacement cost endorsement
covering all of Tenant's trade fixtures, equipment, furniture and other personal
property within the Premises ("Tenant's Property"); (3) Workers' Compensation
Insurance as required by the state in which the Premises is located and in
amounts as may be required by applicable statute; and (4) Employers Liability
Coverage of at least $1,000,000.00 per occurrence.  Any company writing any of
Tenant's Insurance shall have an A.M. Best rating of not less than A-VIII.  All
Commercial General Liability Insurance policies shall name Tenant as a named
insured and Landlord (or any successor), Equity Office Properties Trust, a
Maryland real estate investment trust, EOP Operating Limited Partnership, a
Delaware limited partnership, and their respective members, principals,
beneficiaries, partners, officers, directors, employees, and agents, and other
designees of Landlord as the interest of such designees shall appear, as
additional insureds.  All policies of Tenant's Insurance shall contain
endorsements that the insurer(s) shall give Landlord and its designees at least
30 days' advance written notice of any change, cancellation, termination or
lapse of insurance.  Tenant shall provide Landlord with a certificate of
insurance evidencing Tenant's Insurance prior to the earlier to occur of the
Commencement Date or the date Tenant is provided with possession of the Premises
for any reason, and upon renewals at least 15 days prior to the expiration of
the insurance coverage.  So long as the same is available at commercially
reasonable rates, Landlord shall maintain so called All Risk property insurance
on the Building at replacement cost value, as reasonably estimated by Landlord.
Except as specifically provided to the contrary, the limits of either party's'
insurance shall not limit such party's liability under this Lease.

XVI.  Subrogation.

      Notwithstanding anything in this Lease to the contrary, Landlord and
Tenant hereby waive and shall cause their respective insurance carriers to waive
any and all rights of recovery, claim, action or causes of action against the
other and their respective trustees, principals, beneficiaries, partners,
officers, directors, agents, and employees, for any loss or damage that may
occur to Landlord or Tenant or any party claiming by, through or under Landlord
or Tenant, as the case may be, with respect to Tenant's Property, the Building,
the Premises, any additions or improvements to the Building or Premises, or any
contents thereof, including all rights of recovery, claims, actions or causes of
action arising out of the negligence of Landlord or any Landlord Related Parties
or the negligence of Tenant or any Tenant Related Parties, which loss or damage
is (or would have been, had the insurance required by this Lease been carried)
covered by insurance.

XVII. Casualty Damage.

      A.  If all or any part of the Premises is damaged by fire or other
          casualty, Tenant shall immediately notify Landlord in writing. During
          any period of time that all or a material portion of the Premises is
          rendered untenantable as a result of a fire or other casualty, the
          Rent shall abate for the portion of the Premises that is untenantable
          and not used by Tenant.  Landlord shall have the right to terminate
          this Lease if:  (1) the Building shall be damaged so that, in
          Landlord's reasonable judgment, substantial alteration or
          reconstruction of the Building shall be required (whether or not the
          Premises has been damaged);  (2) Landlord is not permitted by Law to
          rebuild the Building in substantially the same form as existed before
          the fire or casualty; (3) the Premises have been materially damaged
          and there is less

                                      19
<PAGE>

          than 2 years of the Term remaining on the date of the casualty; (4)
          any Mortgagee requires that the insurance proceeds be applied to the
          payment of the mortgage debt; or (5) a material uninsured loss to the
          Building occurs. Landlord may exercise its right to terminate this
          Lease by notifying Tenant in writing within 90 days after the date of
          the casualty. If Landlord does not terminate this Lease, Landlord
          shall commence and proceed with reasonable diligence to repair and
          restore the Building and the Leasehold Improvements (excluding any
          Alterations that were performed by Tenant in violation of this Lease).
          However, in no event shall Landlord be required to spend more than the
          insurance proceeds received by Landlord. Landlord shall not be liable
          for any loss or damage to Tenant's Property or to the business of
          Tenant resulting in any way from the fire or other casualty or from
          the repair and restoration of the damage. Landlord and Tenant hereby
          waive the provisions of any Law relating to the matters addressed in
          this Article, and agree that their respective rights for damage to or
          destruction of the Premises shall be those specifically provided in
          this Lease.

       B. If all or any portion of the Premises shall be made untenantable by
          fire or other casualty, Landlord shall, with reasonable promptness,
          cause an architect or general contractor selected by Landlord to
          provide Landlord and Tenant with a written estimate of the amount of
          time required to substantially complete the repair and restoration of
          the Premises (excluding any Alterations that were performed by Tenant
          in violation of this Lease) to substantially the condition which
          existed prior to such casualty and make the Premises tenantable again,
          using standard working methods ("Completion Estimate").  If the
          Completion Estimate indicates that the Premises cannot be made
          tenantable within 240 days from the date the repair and restoration is
          started, then regardless of anything in Section XVII.A above to the
          contrary, either party shall have the right to terminate this Lease by
          giving written notice to the other of such election within 10 Business
          Days after receipt of the Completion Estimate.  Tenant, however, shall
          not have the right to terminate this Lease if the fire or casualty was
          caused by the negligence or intentional misconduct of Tenant, Tenant
          Related Parties or any of Tenant's transferees, contractors or
          licensees.

XVIII. Condemnation.

       Either party may terminate this Lease if the whole or any material part
of the Premises shall be taken or condemned for any public or quasi-public use
under Law, by eminent domain or private purchase in lieu thereof (a "Taking").
Landlord shall also have the right to terminate this Lease if there is a Taking
of any portion of the Building or Property which would leave the remainder of
the Building unsuitable for use as an office building in a manner comparable to
the Building's use prior to the Taking. In order to exercise its right to
terminate the Lease, Landlord or Tenant, as the case may be, must provide
written notice of termination to the other within 45 days after the terminating
party first receives notice of the Taking. Any such termination shall be
effective as of the date the physical taking of the Premises or the portion of
the Building or Property occurs. If this Lease is not terminated, the Rentable
Square Footage of the Building, the Rentable Square Footage of the Premises and
Tenant's Pro Rata Share shall, if applicable, be appropriately adjusted. In
addition, Rent for any portion of the Premises taken or condemned shall be
abated during the unexpired Term of this Lease effective when the physical
taking of the portion of the Premises occurs. All compensation awarded for a
Taking, or sale proceeds, shall be the property of Landlord, any right to
receive compensation or proceeds being expressly waived by Tenant. However,
Tenant may file a separate claim at its sole cost and expense for Tenant's
Property and Tenant's reasonable relocation expenses, provided the filing of the
claim does not diminish the award which would otherwise be receivable by
Landlord.

XIX.   Events of Default.

       Tenant shall be considered to be in default of this Lease upon the
occurrence of any of the following events of default:

       A. Tenant's failure to pay when due all or any portion of the Rent, if
          the failure continues for 5 Business Days after written notice to
          Tenant ("Monetary Default").

       B. Tenant's failure (other than a Monetary Default) to comply with any
          term, provision or covenant of this Lease, if the failure is not cured
          within 10 Business Days after written notice to Tenant.  However, if
          Tenant's failure to comply cannot

                                      20
<PAGE>

          reasonably be cured within 10 Business Days, Tenant shall be allowed
          additional time (not to exceed 60 days) as is reasonably necessary to
          cure the failure so long as: (1) Tenant commences to cure the failure
          within 10 Business Days, and (2) Tenant diligently pursues a course of
          action that will cure the failure and bring Tenant back into
          compliance with the Lease. However, if Tenant's failure to comply
          creates a hazardous condition, the failure must be cured immediately
          upon notice to Tenant. In addition, if Landlord provides Tenant with
          notice of Tenant's failure to comply with any particular term,
          provision or covenant of the Lease on 3 occasions during any 12 month
          period, Tenant's subsequent violation of such term, provision or
          covenant shall, at Landlord's option, be an incurable event of default
          by Tenant.

       C. Tenant or any Guarantor becomes insolvent, makes a transfer in fraud
          of creditors or makes an assignment for the benefit of creditors, or
          admits in writing its inability to pay its debts when due.

       D. The leasehold estate is taken by process or operation of Law.

       E  Tenant is in default beyond any notice and cure period under any other
          lease or agreement with Landlord, including, without limitation, any
          lease or agreement for parking.

XX.    Remedies.

       A. Upon the occurrence of any event or events of default under this
          Lease, whether enumerated in Article XIX or not, Landlord shall have
          the option to pursue any one or more of the following remedies without
          any notice (except as expressly prescribed herein) or demand
          whatsoever (and without limiting the generality of the foregoing,
          Tenant hereby specifically waives notice and demand for payment of
          Rent or other obligations and waives any and all other notices or
          demand requirements imposed by applicable law):

          1.   Terminate this Lease and Tenant's right to possession of the
               Premises and recover from Tenant an award of damages equal to the
               sum of the following:

               (a)  The Worth at the Time of Award of the unpaid Rent which had
                    been earned at the time of termination;

               (b)  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 Tenant affirmatively proves could have been reasonably
                    avoided;

               (c)  The Worth at the Time of Award of the amount by which the
                    unpaid Rent for the balance of the Term after the time of
                    award exceeds the amount of such Rent loss that Tenant
                    affirmatively proves could be reasonably avoided;

               (d)  Any other amount necessary to compensate Landlord for all
                    the detriment either proximately caused by Tenant's failure
                    to perform Tenant's obligations under this Lease or which in
                    the ordinary course of things would be likely to result
                    therefrom; and

               (e)  All such other amounts in addition to or in lieu of the
                    foregoing as may be permitted from time to time under
                    applicable law.

               The "Worth at the Time of Award" of the amounts referred to in
               parts (a) and (b) above, shall be computed by allowing interest
               at the lesser of a per annum rate equal to: (i) the greatest per
               annum rate of interest permitted from time to time under
               applicable law, or (ii) the Prime Rate plus four percent (4%).
               For purposes hereof, the "Prime Rate" shall be the per annum
               interest rate publicly announced as its prime or base rate by a
               federally insured bank selected by Landlord in the State of
               California.  The "Worth at the Time of Award" of the amount
               referred to in part (c), above,

                                      21
<PAGE>

               shall be computed by discounting such amount at the discount rate
               of the Federal Reserve Bank of San Francisco at the time of award
               plus one percent (1%);

          2.   Employ the remedy described in California Civil Code (S) 1951.4
               (Landlord may continue this Lease in effect after Tenant's breach
               and abandonment and recover Rent as it becomes due, if Tenant has
               the right to sublet or assign, subject only to reasonable
               limitations); or

          3.   Notwithstanding Landlord's exercise of the remedy described in
               California Civil Code (S) 1951.4 in respect of an event or events
               of default, at such time thereafter as Landlord may elect in
               writing, to terminate this Lease and Tenant's right to possession
               of the Premises and recover an award of damages as provided above
               in Paragraph XX.A.1.

      B.  The subsequent acceptance of Rent hereunder by Landlord shall not be
          deemed to be a waiver of any preceding breach by Tenant of any term,
          covenant or condition of this Lease, other than the failure of Tenant
          to pay the particular Rent so accepted, regardless of Landlord's
          knowledge of such preceding breach at the time of acceptance of such
          Rent.  No waiver by Landlord of any breach hereof shall be effective
          unless such waiver is in writing and signed by Landlord.

       C. TENANT HEREBY WAIVES ANY AND ALL RIGHTS CONFERRED BY SECTION 3275 OF
          THE CIVIL CODE OF CALIFORNIA AND BY SECTIONS 1174 (C) AND 1179 OF THE
          CODE OF CIVIL PROCEDURE OF CALIFORNIA AND ANY AND ALL OTHER LAWS AND
          RULES OF LAW FROM TIME TO TIME IN EFFECT DURING THE LEASE TERM
          PROVIDING THAT TENANT SHALL HAVE ANY RIGHT TO REDEEM, REINSTATE OR
          RESTORE THIS LEASE FOLLOWING ITS TERMINATION BY REASON OF TENANT'S
          BREACH.  TENANT ALSO HEREBY WAIVES, TO THE FULLEST EXTENT PERMITTED BY
          LAW, THE RIGHT TO TRIAL BY JURY IN ANY LITIGATION ARISING OUT OF OR
          RELATING TO THIS LEASE.

       D. No right or remedy herein conferred upon or reserved to Landlord is
          intended to be exclusive of any other right or remedy, and each and
          every right and remedy shall be cumulative and in addition to any
          other right or remedy given hereunder or now or hereafter existing by
          agreement, applicable law or in equity.  In addition to other remedies
          provided in this Lease, Landlord shall be entitled, to the extent
          permitted by applicable law, to injunctive relief, or to a decree
          compelling performance of any of the covenants, agreements, conditions
          or provisions of this Lease, or to any other remedy allowed to
          Landlord at law or in equity.  Forbearance by Landlord to enforce one
          or more of the remedies herein provided upon an event of default shall
          not be deemed or construed to constitute a waiver of such default.

       E. This Article XX shall be enforceable to the maximum extent such
          enforcement is not prohibited by applicable law, and the
          unenforceability of any portion thereof shall not thereby render
          unenforceable any other portion.

XXI.   Limitation of Liability.

       NOTWITHSTANDING ANYTHING TO THE CONTRARY CONTAINED IN THIS LEASE, THE
LIABILITY OF LANDLORD (AND OF ANY SUCCESSOR LANDLORD) TO TENANT SHALL BE LIMITED
TO THE INTEREST OF LANDLORD IN THE PROPERTY.  TENANT SHALL LOOK SOLELY TO
LANDLORD'S INTEREST IN THE PROPERTY FOR THE RECOVERY OF ANY JUDGMENT OR AWARD
AGAINST LANDLORD. NEITHER LANDLORD NOR ANY LANDLORD RELATED PARTY SHALL BE
PERSONALLY LIABLE FOR ANY JUDGMENT OR DEFICIENCY.  BEFORE FILING SUIT FOR AN
ALLEGED DEFAULT BY LANDLORD, TENANT SHALL GIVE LANDLORD AND THE MORTGAGEE(S)
(DEFINED IN ARTICLE XXVI BELOW) WHOM TENANT HAS BEEN NOTIFIED HOLD MORTGAGES
(DEFINED IN ARTICLE XXVI BELOW) ON THE PROPERTY, BUILDING OR PREMISES, NOTICE
AND REASONABLE TIME TO CURE THE ALLEGED DEFAULT.

                                      22
<PAGE>

XXII.  No Waiver.

       Either party's failure to declare a default immediately upon its
occurrence, or delay in taking action for a default shall not constitute a
waiver of the default, nor shall it constitute an estoppel.  Either party's
failure to enforce its rights for a default shall not constitute a waiver of its
rights regarding any subsequent default.  Receipt by Landlord of Tenant's keys
to the Premises shall not constitute an acceptance or surrender of the Premises.

XXIII. Quiet Enjoyment.

       Tenant shall, and may peacefully have, hold and enjoy the Premises,
subject to the terms of this Lease, provided Tenant pays the Rent and fully
performs all of its covenants and agreements. This covenant and all other
covenants of Landlord shall be binding upon Landlord and its successors only
during its or their respective periods of ownership of the Building, and shall
not be a personal covenant of Landlord or the Landlord Related Parties.

XXIV.  Relocation.

       Landlord, at its expense, at any time before or during the Term, may
relocate Tenant from any additional space which may be added to the original
2/nd/, 3/rd/, 4/th/, 5/th/, 6/th/, 7/th/ and 8/th/ floor Premises pursuant to
any options granted pursuant to this Lease or any amendments to this Lease
mutually agreed to by Landlord and Tenant (the "Additional Spaces") to
reasonably comparable space ("Relocation Space") within the Building or adjacent
buildings within the same project upon 60 days' prior written notice to Tenant.
From and after the date of the relocation, "Premises" shall refer to the
Relocation Space into which Tenant has been moved and the Base Rent and Tenant's
Pro Rata Share shall be adjusted based on the rentable square footage of the
Relocation Space.  Landlord shall pay Tenant's reasonable costs for moving
Tenant's furniture and equipment and printing and distributing notices to
Tenant's customers of Tenant's change of address and one month's supply of
stationery showing the new address.

XXV.   Holding Over.

       Except for any permitted occupancy by Tenant under Article VIII, if
Tenant fails to surrender the Premises at the expiration or earlier termination
of this Lease, occupancy of the Premises after the termination or expiration
shall be that of a tenancy at sufferance. Tenant's occupancy of the Premises
during the holdover shall be subject to all the terms and provisions of this
Lease and Tenant shall pay an amount (on a per month basis without reduction for
partial months during the holdover) equal to 125% of the greater of: (1) the sum
of the Base Rent and Additional Rent due for the period immediately preceding
the holdover; or (2) the fair market gross rental for the Premises as reasonably
determined by Landlord. Notwithstanding the foregoing, if such holding over
continues for more than 30 days, effective as of the 31/st/ day, holdover rent
shall increase to 150% of the greater of: (a) the sum of the Base Rent and
Additional Rent due for the period immediately preceding the holdover; or (b)
the fair market gross rental for the Premises as reasonably determined by
Landlord. No holdover by Tenant or payment by Tenant after the expiration or
early termination of this Lease shall be construed to extend the Term or prevent
Landlord from immediate recovery of possession of the Premises by summary
proceedings or otherwise. In addition to the payment of the amounts provided
above, if Landlord is unable to deliver possession of the Premises to a new
tenant, or to perform improvements for a new tenant, as a result of Tenant's
holdover and Tenant fails to vacate the Premises within 30 days after Landlord
notifies Tenant of Landlord's inability to deliver possession, or perform
improvements, Tenant shall be liable to Landlord for all damages, including,
without limitation, consequential damages, that Landlord suffers from the
holdover.

XXVI.  Subordination to Mortgages; Estoppel Certificate.

       Tenant accepts this Lease subject and subordinate to any mortgage(s),
deed(s) of trust, ground lease(s) or other lien(s) now or subsequently arising
upon the Premises, the Building or the Property, and to renewals, modifications,
refinancings and extensions thereof (collectively referred to as a "Mortgage").
The party having the benefit of a Mortgage shall be referred to as a
"Mortgagee". This clause shall be self-operative, but upon request from a
Mortgagee, Tenant shall execute a commercially reasonable subordination
agreement in favor of the Mortgagee. In lieu of having the Mortgage be superior
to this Lease, a Mortgagee shall have the right at any time to subordinate its
Mortgage to this Lease.  If requested by a successor-in-interest to all or a
part of Landlord's interest in the Lease, Tenant shall, without charge, attorn
to the successor-in-interest.  Landlord and Tenant shall each, within 10 days
after receipt of a written request from

                                      23
<PAGE>

the other, execute and deliver an estoppel certificate to those parties as are
reasonably requested by the other (including a Mortgagee or prospective
purchaser). The estoppel certificate shall include a statement certifying that
this Lease is unmodified (except as identified in the estoppel certificate) and
in full force and effect, describing the dates to which Rent and other charges
have been paid, representing that, to such party's actual knowledge, there is no
default (or stating the nature of the alleged default) and indicating other
matters with respect to the Lease that may reasonably be requested.
Notwithstanding the foregoing, upon written request by Tenant, Landlord will use
reasonable efforts to obtain a non-disturbance, subordination and attornment
agreement from Landlord's then current Mortgagee on such Mortgagee's then
current standard form of agreement. "Reasonable efforts" of Landlord shall not
require Landlord to incur any cost, expense or liability to obtain such
agreement, it being agreed that Tenant shall be responsible for any fee or
review costs charged by the Mortgagee. Upon request of Landlord, Tenant will
execute the Mortgagee's form of non-disturbance, subordination and attornment
agreement and return the same to Landlord for execution by the Mortgagee.
Landlord's failure to obtain a non-disturbance, subordination and attornment
agreement for Tenant shall have no effect on the rights, obligations and
liabilities of Landlord and Tenant or be considered to be a default by Landlord
hereunder.

XXVII.  Attorneys' Fees.

        If either party institutes a suit against the other for violation of or
to enforce any covenant or condition of this Lease, or if either party
intervenes in any suit in which the other is a party to enforce or protect its
interest or rights, the prevailing party shall be entitled to all of its costs
and expenses, including, without limitation, reasonable attorneys' fees.

XXVIII. Notice.

        If a demand, request, approval, consent or notice (collectively referred
to as a "notice") shall or may be given to either party by the other, the notice
shall be in writing and delivered by hand or sent by registered or certified
mail with return receipt requested, or sent by overnight or same day courier
service at the party's respective Notice Address(es) set forth in Article I,
except that if Tenant has vacated the Premises (or if the Notice Address for
Tenant is other than the Premises, and Tenant has vacated such address) without
providing Landlord a new Notice Address, Landlord may serve notice in any manner
described in this Article or in any other manner permitted by Law.  Each notice
shall be deemed to have been received or given on the earlier to occur of actual
delivery or the date on which delivery is refused, or, if Tenant has vacated the
Premises or the other Notice Address of Tenant without providing a new Notice
Address, 3 Business Days after notice is deposited in the U.S. mail or with a
courier service in the manner described above.  Either party may, at any time,
change its Notice Address by giving the other party written notice of the new
address in the manner described in this Article.

XXIX.   Excepted Rights.

        This Lease does not grant any rights to light or air over or about the
Building.  Landlord excepts and reserves exclusively to itself the use of:  (1)
roofs, (2) telephone, electrical and janitorial closets, (3) equipment rooms,
Building risers or similar areas that are used by Landlord for the provision of
Building services, (4) rights to the land and improvements below the floor of
the Premises, (5) the improvements and air rights above the Premises, (6) the
improvements and air rights outside the demising walls of the Premises, and (7)
the areas within the Premises used for the installation of utility lines and
other installations serving occupants of the Building. Landlord has the right to
change the Building's name or address.  Landlord also has the right to make such
other changes to the Property and Building as Landlord deems appropriate,
provided the changes do not materially affect Tenant's ability to use the
Premises for the Permitted Use.  Landlord shall also have the right (but not the
obligation) to temporarily close the Building if Landlord reasonably determines
that there is an imminent danger of significant damage to the Building or of
personal injury to Landlord's employees or the occupants of the Building.  The
circumstances under which Landlord may temporarily close the Building shall
include, without limitation, electrical interruptions, hurricanes and civil
disturbances.  A closure of the Building under such circumstances shall not
constitute a constructive eviction nor entitle Tenant to an abatement or
reduction of Rent.

XXX.    Surrender of Premises.

        At the expiration or earlier termination of this Lease or Tenant's right
of possession, Tenant shall remove Tenant's Property (defined in Article XV)
from the Premises, and quit and

                                      24
<PAGE>

surrender the Premises to Landlord, broom clean, and in good order, condition
and repair, ordinary wear and tear excepted. Tenant shall also be required to
remove the Required Removables in accordance with Article VIII. If Tenant fails
to remove any of Tenant's Property within 2 Business Days after the termination
of this Lease or of Tenant's right to possession, Landlord, at Tenant's sole
cost and expense, shall be entitled (but not obligated) to remove and store
Tenant's Property. Landlord shall not be responsible for the value, preservation
or safekeeping of Tenant's Property. Tenant shall pay Landlord, upon demand, the
expenses and storage charges incurred for Tenant's Property. In addition, if
Tenant fails to remove Tenant's Property from the Premises or storage, as the
case may be, within 30 days after written notice, Landlord may deem all or any
part of Tenant's Property to be abandoned, and title to Tenant's Property shall
be deemed to be immediately vested in Landlord.

XXXI.  Miscellaneous.

       A. This Lease and the rights and obligations of the parties shall be
          interpreted, construed and enforced in accordance with the Laws of the
          State of California and Landlord and Tenant hereby irrevocably consent
          to the jurisdiction and proper venue of such state.  If any term or
          provision of this Lease shall to any extent be invalid or
          unenforceable, the remainder of this Lease shall not be affected, and
          each provision of this Lease shall be valid and enforced to the
          fullest extent permitted by Law.  The headings and titles to the
          Articles and Sections of this Lease are for convenience only and shall
          have no effect on the interpretation of any part of the Lease.

       B. Tenant shall not record this Lease or any memorandum without
          Landlord's prior written consent.

       C. Landlord and Tenant hereby waive any right to a trial by jury in any
          eviction or forcible entry and detainer action or similar proceeding
          based upon, or related to, the subject matter of this Lease.

       D. Whenever a period of time is prescribed for the taking of an action by
          Landlord or Tenant, the period of time for the performance of such
          action shall be extended by the number of days that the performance is
          actually delayed due to strikes, acts of God, shortages of labor or
          materials, war, civil disturbances and other causes beyond the
          reasonable control of the performing party ("Force Majeure").
          However, events of Force Majeure shall not extend any period of time
          for the payment of Rent or other sums payable by either party or any
          period of time for the written exercise of an option or right by
          either party.

       E. Landlord shall have the right to transfer and assign, in whole or in
          part, all of its rights and obligations under this Lease and in the
          Building and/or Property referred to herein, and upon such transfer
          Landlord shall be released from any further obligations hereunder, and
          Tenant agrees to look solely to the successor in interest of Landlord
          for the performance of such obligations.

       F. Tenant represents that it has dealt directly with and only with the
          Broker as a broker in connection with this Lease.  Tenant shall
          indemnify and hold Landlord and the Landlord Related Parties harmless
          from all claims of any other brokers claiming to have represented
          Tenant in connection with this Lease.  Landlord agrees to indemnify
          and hold Tenant and the Tenant Related Parties harmless from all
          claims of any brokers claiming to have represented Landlord in
          connection with this Lease.

       G. Tenant covenants, warrants and represents that:  (1) each individual
          executing, attesting and/or delivering this Lease on behalf of Tenant
          is authorized to do so on behalf of Tenant; (2) this Lease is binding
          upon Tenant; and (3) Tenant is duly organized and legally existing in
          the state of its organization and is qualified to do business in the
          State of California.  If there is more than one Tenant, or if Tenant
          is comprised of more than one party or entity, the obligations imposed
          upon Tenant shall be joint and several obligations of all the parties
          and entities.  Notices, payments and agreements given or made by, with
          or to any one person or entity shall be deemed to have been given or
          made by, with and to all of them.

                                      25
<PAGE>

       H. Time is of the essence with respect to Tenant's exercise of any
          expansion, renewal or extension rights granted to Tenant.  This Lease
          shall create only the relationship of landlord and tenant between the
          parties, and not a partnership, joint venture or any other
          relationship.  This Lease and the covenants and conditions in this
          Lease shall inure only to the benefit of and be binding only upon
          Landlord and Tenant and their permitted successors and assigns.

       I. The expiration of the Term, whether by lapse of time or otherwise,
          shall not relieve either party of any obligations which accrued prior
          to or which may continue to accrue after the expiration or early
          termination of this Lease.  Without limiting the scope of the prior
          sentence, it is agreed that Tenant's obligations under Sections IV.A,
          IV.B., VIII, XIV, XX, XXV and XXX shall survive the expiration or
          early termination of this Lease.

       J. Landlord has delivered a copy of this Lease to Tenant for Tenant's
          review only, and the delivery of it does not constitute an offer to
          Tenant or an option.  This Lease shall not be effective against any
          party hereto until an original copy of this Lease has been signed by
          both parties and delivered to each party hereto.

       K. All understandings and agreements previously made between the parties
          are superseded by this Lease, and neither party is relying upon any
          warranty, statement or representation not contained in this Lease.
          This Lease may be modified only by a written agreement signed by
          Landlord and Tenant.

       L. Tenant, within 15 Business Days after request, shall provide Landlord
          with a current financial statement and such other information as
          Landlord may reasonably request in order to create a "business
          profile" of Tenant and determine Tenant's ability to fulfill its
          obligations under this Lease.  Landlord, however, shall not require
          Tenant to provide such information unless Landlord is requested to
          produce the information in connection with a proposed financing or
          sale of the Building.  Upon written request by Tenant, Landlord shall
          enter into a commercially reasonable confidentiality agreement
          covering any confidential information that is disclosed by Tenant.

       M. Pursuant to City Planning Code Section 163, the Landlord has entered
          into an agreement with the Department of City Planning for the City of
          San Francisco, California to provide and implement a Transportation
          Management Program for building tenants and to participate in a
          program designed to coordinate commute alternatives marketing and
          brokerage for greater downtown San Francisco, California employees.
          During the Term of this Lease, Landlord agrees to provide
          transportation brokerage and commute assistance services to Tenant and
          to assist Tenant in meeting the transportation needs of its employees.
          Tenant agrees to cooperate with and assist the Landlord's
          transportation management coordinator (the "Coordinator"), through
          designation of a responsible employee to distribute to Tenant's
          employees written materials promoting and encouraging the use of
          public transit and/or ridesharing, and distribute and return to the
          Coordinator transportation survey questionnaire forms.  Tenant may
          agree, at its option, to participate in other activities required of
          Landlord as incentives for increasing use of public transit and/or
          ridesharing by employees in the Building.

XXXII. Entire Agreement.

       This Lease and the following exhibits and attachments constitute the
entire agreement between the parties and supersede all prior agreements and
understandings related to the Premises, including all lease proposals, letters
of intent and other documents: Exhibit A-1 (Outline and Location of Premises A),
Exhibit A-2 (Outline and Location of Premises B), Exhibit A-3 (Outline and
Location of Premises C), Exhibit B (Rules and Regulations), Exhibit C
(Commencement Letter), Exhibit D (Work Letter Agreement), Exhibit D-1 (Summary
of Final Plans), Exhibit E (Additional Provisions), Exhibit E-1 (Tenant's Logo),
Exhibit F (Parking Agreement) and Exhibit G (Form of Letter of Credit).

                                      26
<PAGE>

     Landlord and Tenant have executed this Lease as of the day and year first
above written.

                             LANDLORD:

                             EOP-150 CALIFORNIA STREET, L.L.C., a Delaware
                             limited liability company

                             By:  EOP Operating Limited Partnership, a Delaware
                                  limited partnership, its sole member

                                  By:  Equity Office Properties Trust, a
                                       Maryland real estate investment trust,
                                       its managing general partner

                                       By:  /s/ Peter H. Adams
                                          ---------------------------------

                                       Name:  Peter H. Adams
                                            -------------------------------

                                       Title:  Senior Vice President
                                             ------------------------------

                             TENANT:

                             TENFOLD CORPORATION, a Delaware corporation

                             By:  /s/ Robert P. Hughes
                                  -----------------------------------------

                             Name:  Robert P. Hughes
                                  -----------------------------------------

                             Title:  Chief Financial Officer
                                   ----------------------------------------

                             By:  /s/ Gary D. Kennedy
                                -------------------------------------------

                             Name:  Gary D. Kennedy
                                  -----------------------------------------
                             Title:  President and Chief Executive Officer
                                   ----------------------------------------

                                      27
<PAGE>

                                  EXHIBIT A-1

                       OUTLINE AND LOCATION OF PREMISES A
                       ----------------------------------

     This Exhibit is attached to and made a part of the Lease dated as of March
3, 2000, by and between EOP-150 CALIFORNIA STREET, L.L.C., a Delaware limited
liability company ("Landlord") and TENFOLD CORPORATION, a Delaware corporation
("Tenant") for space in the Building located at 150 California Street, San
Francisco, California.

                           [FLOOR PLAN APPEARS HERE]

                                    Floor 7

                           [FLOOR PLAN APPEARS HERE]

                                    Floor 8

                                  Page 1 of 3
<PAGE>

                                  EXHIBIT A-2

                       OUTLINE AND LOCATION OF PREMISES B
                       ----------------------------------

     This Exhibit is attached to and made a part of the Lease dated as of March
3, 2000, by and between EOP-150 CALIFORNIA STREET, L.L.C., a Delaware limited
liability company ("Landlord") and TENFOLD CORPORATION, a Delaware corporation
("Tenant") for space in the Building located at 150 California Street, San
Francisco, California.

                           [FLOOR PLAN APPEARS HERE]

                                    Floor 5

                           [FLOOR PLAN APPEARS HERE]

                                   Floor 6

                                  Page 2 of 3
<PAGE>

                                  EXHIBIT A-3

                       OUTLINE AND LOCATION OF PREMISES C
                       ----------------------------------

     This Exhibit is attached to and made a part of the Lease dated as of March
3, 2000, by and between EOP-150 CALIFORNIA STREET, L.L.C., a Delaware limited
liability company ("Landlord") and TENFOLD CORPORATION, a Delaware corporation
("Tenant") for space in the Building located at 150 California Street, San
Francisco, California.

                           [FLOOR PLAN APPEARS HERE]

                                    Floor 2

       [FLOOR PLAN APPEARS HERE]             [FLOOR PLAN APPEARS HERE]

                Floor 3                              Floor 4

                                  Page 3 of 3

<PAGE>

                                   EXHIBIT B

                         BUILDING RULES AND REGULATIONS
                         ------------------------------

     The following rules and regulations shall apply, where applicable, to the
Premises, the Building, the parking garage (if any), the Property and the
appurtenances.  Capitalized terms have the same meaning as defined in the Lease.

1.   Sidewalks, doorways, vestibules, halls, stairways and other similar areas
     shall not be obstructed by Tenant or used by Tenant for any purpose other
     than ingress and egress to and from the Premises.  No rubbish, litter,
     trash, or material shall be placed, emptied, or thrown in those areas.  At
     no time shall Tenant permit Tenant's employees to loiter in Common Areas or
     elsewhere about the Building or Property.

2.   Plumbing fixtures and appliances shall be used only for the purposes for
     which designed, and no sweepings, rubbish, rags or other unsuitable
     material shall be thrown or placed in the fixtures or appliances.  Damage
     resulting to fixtures or appliances by Tenant, its agents, employees or
     invitees, shall be paid for by Tenant, and Landlord shall not be
     responsible for the damage.

3.   No signs, advertisements or notices shall be painted or affixed to windows,
     doors or other parts of the Building, except those of such color, size,
     style and in such places as are first approved in writing by Landlord.  All
     tenant identification and suite numbers at the entrance to the Premises
     shall be installed by Landlord, at Tenant's cost and expense, using the
     standard graphics for the Building. Except in connection with the hanging
     of lightweight pictures and wall decorations, no nails, hooks or screws
     shall be inserted into any part of the Premises or Building except by the
     Building maintenance personnel.

4.   Landlord may provide and maintain in the first floor (main lobby) of the
     Building an alphabetical directory board or other directory device listing
     tenants, and no other directory shall be permitted unless previously
     consented to by Landlord in writing.

5.   Tenant shall not place any lock(s) on any door in the Premises or Building
     without Landlord's prior written consent and Landlord shall have the right
     to retain at all times and to use keys to all locks within and into the
     Premises.  A reasonable number of keys to the locks on the entry doors in
     the Premises shall be furnished by Landlord to Tenant at Tenant's cost, and
     Tenant shall not make any duplicate keys.  All keys shall be returned to
     Landlord at the expiration or early termination of this Lease.

6.   All contractors, contractor's representatives and installation technicians
     performing work in the Building shall be subject to Landlord's prior
     approval and shall be required to comply with Landlord's standard rules,
     regulations, policies and procedures, which may be revised from time to
     time.

7.   Movement in or out of the Building of furniture or office equipment, or
     dispatch or receipt by Tenant of merchandise or materials requiring the use
     of elevators, stairways, lobby areas or loading dock areas, shall be
     restricted to hours designated by Landlord.  Tenant shall obtain Landlord's
     prior approval by providing a detailed listing of the activity.  If
     approved by Landlord, the activity shall be under the supervision of
     Landlord and performed in the manner required by Landlord.  Tenant shall
     assume all risk for damage to articles moved and injury to any persons
     resulting from the activity.  If equipment, property, or personnel of
     Landlord or of any other party is damaged or injured as a result of or in
     connection with the activity, Tenant shall be solely liable for any
     resulting damage or loss.

8.   Landlord shall have the right to approve the weight, size, or location of
     heavy equipment or articles in and about the Premises.  Damage to the
     Building by the installation, maintenance, operation, existence or removal
     of Tenant's Property shall be repaired at Tenant's sole expense.

9.   Corridor doors, when not in use, shall be kept closed.

10.  Tenant shall not:  (1) make or permit any improper, objectionable or
     unpleasant noises or odors in the Building, or otherwise interfere in any
     way with other tenants or persons having business with them; (2) solicit
     business or distribute, or cause to be distributed, in any portion of the
     Building, handbills, promotional materials or other advertising; or (3)
     conduct or permit other activities in the Building that might, in
     Landlord's sole opinion, constitute a nuisance.
<PAGE>

11.  No animals, except those assisting handicapped persons, shall be brought
     into the Building or kept in or about the Premises.

12.  No inflammable, explosive or dangerous fluids or substances shall be used
     or kept by Tenant in the Premises, Building or about the Property.  Tenant
     shall not, without Landlord's prior written consent, use, store, install,
     spill, remove, release or dispose of, within or about the Premises or any
     other portion of the Property, any asbestos-containing materials or any
     solid, liquid or gaseous material now or subsequently considered toxic or
     hazardous under the provisions of 42 U.S.C. Section 9601 et seq. or any
     other applicable environmental Law which may now or later be in effect.
     Tenant shall comply with all Laws pertaining to and governing the use of
     these materials by Tenant, and shall remain solely liable for the costs of
     abatement and removal.

13.  Tenant shall not use or occupy the Premises in any manner or for any
     purpose which might injure the reputation or impair the present or future
     value of the Premises or the Building. Tenant shall not use, or permit any
     part of the Premises to be used, for lodging, sleeping or for any illegal
     purpose.

14.  Tenant shall not take any action which would violate Landlord's labor
     contracts or which would cause a work stoppage, picketing, labor disruption
     or dispute, or interfere with Landlord's or any other tenant's or
     occupant's business or with the rights and privileges of any person
     lawfully in the Building ("Labor Disruption").  Tenant shall take the
     actions necessary to resolve the Labor Disruption, and shall have pickets
     removed and, at the request of Landlord, immediately terminate any work in
     the Premises that gave rise to the Labor Disruption, until Landlord gives
     its written consent for the work to resume.  Tenant shall have no claim for
     damages against Landlord or any of the Landlord Related Parties, nor shall
     the Commencement Date of the Term be extended as a result of the above
     actions.

15.  Tenant shall not install, operate or maintain in the Premises or in any
     other area of the Building, electrical equipment that would overload the
     electrical system beyond its capacity for proper, efficient and safe
     operation as determined solely by Landlord.  Tenant shall not furnish
     cooling or heating to the Premises, including, without limitation, the use
     of electronic or gas heating devices, without Landlord's prior written
     consent.  Tenant shall not use more than its proportionate share of
     telephone lines and other telecommunication facilities available to service
     the Building.

16.  Tenant shall not operate or permit to be operated a coin or token operated
     vending machine or similar device (including, without limitation,
     telephones, lockers, toilets, scales, amusement devices and machines for
     sale of beverages, foods, candy, cigarettes and other goods), except for
     machines for the exclusive use of Tenant's employees.

17.  Bicycles and other vehicles are not permitted inside the Building or on the
     walkways outside the Building, except in areas designated by Landlord.

18.  Landlord may from time to time adopt systems and procedures for the
     security and safety of the Building, its occupants, entry, use and
     contents.  Tenant, its agents, employees, contractors, guests and invitees
     shall comply with Landlord's systems and procedures.

19.  Landlord shall have the right to prohibit the use of the name of the
     Building or any other publicity by Tenant that in Landlord's sole opinion
     may impair the reputation of the Building or its desirability.  Upon
     written notice from Landlord, Tenant shall refrain from and discontinue
     such publicity immediately.

20.  Tenant shall not canvass, solicit or peddle in or about the Building or the
     Property.

21.  Neither Tenant nor its agents, employees, contractors, guests or invitees
     shall smoke or permit smoking in the Common Areas, unless the Common Areas
     have been declared a designated smoking area by Landlord, nor shall the
     above parties allow smoke from the Premises to emanate into the Common
     Areas or any other part of the Building.  Landlord shall have the right to
     designate the Building (including the Premises) as a non-smoking building.
<PAGE>

22.  Landlord shall have the right to designate and approve standard window
     coverings for the Premises and to establish rules to assure that the
     Building presents a uniform exterior appearance.  Tenant shall ensure, to
     the extent reasonably practicable, that window coverings are closed on
     windows in the Premises while they are exposed to the direct rays of the
     sun.

23.  Deliveries to and from the Premises shall be made only at the times, in the
     areas and through the entrances and exits designated by Landlord.  Tenant
     shall not make deliveries to or from the Premises in a manner that might
     interfere with the use by any other tenant of its premises or of the Common
     Areas, any pedestrian use, or any use which is inconsistent with good
     business practice.

24.  The work of cleaning personnel shall not be hindered by Tenant after 5:30
     p.m., and cleaning work may be done at any time when the offices are
     vacant. Windows, doors and fixtures may be cleaned at any time.  Tenant
     shall provide adequate waste and rubbish receptacles to prevent
     unreasonable hardship to the cleaning service.
<PAGE>

                                   EXHIBIT C

                              COMMENCEMENT LETTER
                              -------------------
                                   (EXAMPLE)

Date      ______________________

Tenant    ______________________
Address   ______________________
          ______________________
          ______________________

Re:  Commencement Letter with respect to that certain Lease dated as of
     _________, 2000, by and between EOP-150 CALIFORNIA STREET, L.L.C., a
     Delaware limited liability company, as Landlord, and TENFOLD CORPORATION, a
     Delaware corporation, as Tenant, for 77,430 rentable square feet on the
     2/nd/, 3/rd/, 4/th/, 5/th/, 6/th/, 7/th/ and 8/th/ floors of the Building
     located at 150 California Street, San Francisco, California.

Dear __________________:

     In accordance with the terms and conditions of the above referenced Lease,
Tenant accepts possession of the Premises and agrees:

1.        The Premises A Commencement Date of the Lease is ____________________.

2.        The Premises B Commencement Date of the Lease is ____________________.

3.        The Premises C Commencement Date of the Lease is ___________________.

4.        The Termination Date of the Lease is ____________________________.

     Please acknowledge your acceptance of possession and agreement to the terms
set forth above by signing all 3 counterparts of this Commencement Letter in the
space provided and returning 2 fully executed counterparts to my attention.

Sincerely,

___________________________________
Property Manager

Agreed and Accepted:

Tenant:  ______________________

By:      ______________________
Name:    ______________________
Title:   ______________________
Date:    ______________________
<PAGE>

                                   EXHIBIT D

                                  WORK LETTER
                                  -----------

     This Exhibit is attached to and made a part of the Lease dated as of March
3, 2000, by and between EOP-150 CALIFORNIA STREET, L.L.C., a Delaware limited
liability company ("Landlord") and TENFOLD CORPORATION, a Delaware corporation
("Tenant") for space in the Building located at 150 California Street, San
Francisco, California.

1.   This Work Letter shall set forth the obligations of Landlord and Tenant
     with respect to the preparation of the Premises for Tenant's occupancy.
     All improvements described in this Work Letter to be constructed in and
     upon the Premises by Landlord are hereinafter referred to as the "Landlord
     Work." It is agreed that construction of the Landlord Work will be
     completed at Tenant's sole cost and expense, subject to the Allowance (as
     defined below).  Landlord shall enter into a direct contract for the
     Landlord Work with Webcor Builders (the "General Contractor").  Landlord's
     contract with the General Contractor shall provide that the General
     Contractor's combined general conditions, profit and overhead payable in
     connection with the Landlord Work shall not exceed, (i) 10% of the total
     contract amount payable by Landlord to the General Contractor in the event
     the total amount of the contract for the Landlord Work between Landlord and
     the General Contractor is greater than $750,000.00 and less than
     $2,999,999.99, and (ii) 7% of the total contract amount payable by Landlord
     to the General Contractor in the event the total amount of the contract for
     the Landlord Work between Landlord and the General Contractor is greater
     than $3,000,000.00.  Landlord will not charge a separate construction fee
     in connection with the initial Landlord Work in the Premises.  Landlord
     shall not charge the General Contractor for the use of the freight elevator
     during the construction of the Landlord Work.  The General Contractor will
     solicit bids from no less than 3 separate pre-qualified subcontractors
     mutually agreed upon by Landlord and Tenant as to each major trade involved
     with the Landlord Work; provided, however, Tenant shall have the right to
     direct the General Contractor to accept the lowest bid received.
     Notwithstanding the foregoing to the contrary, Tenant agrees that Landlord
     shall utilize Landlord's building-approved engineering firm and contractors
     for all engineering work and for all fire/life safety, electrical,
     plumbing, HVAC and mechanical work to be performed in connection with the
     construction of the Landlord Work.  Landlord's Work shall not include base
     building work (the "Base Building Work") which shall be performed by
     Landlord at Landlord's sole cost and expense prior to or concurrent with
     Landlord's construction of Landlord's Work in the Premises substantially in
     accordance with the construction documents prepared by Hellmuth Obata &
     Kassabaum, Inc., and designated as M&L Project #6502.00 (the "Final
     Plans"), a partial summary of which is set forth on Exhibit D-1 to the
     Lease.  In the event of a conflict between the Final Plans and the
     provisions of Exhibit D-1, the Final Plans will control.  In no event shall
     the cost of the Base Building Work be applied against or deducted from the
     Allowance (as hereinafter defined).  Landlord shall have the right to
     change the plans and specifications for the Base Building Work from time to
     time, provided that Landlord shall not materially reduce the overall
     quality of the Base Building Work.  Landlord will comply with all
     applicable Laws in connection with the construction of the Base Building
     Work.

2.   Tenant shall be solely responsible for the timely preparation and
     submission to Landlord of the final architectural, electrical and
     mechanical construction drawings, plans and specifications (called "Plans")
     necessary to construct the Landlord Work, which plans shall be subject to
     approval by Landlord and Landlord's architect and engineers and shall
     comply with their requirements to avoid aesthetic or other conflicts with
     the design and function of the balance of the Building.  Landlord and
     Tenant acknowledge and agree that the Landlord Work shall be performed in
     separate phases for each of Premises A, Premises B and Premises C, and that
     Tenant shall prepare separate architectural, electrical and mechanical
     construction drawings, plans and specifications for each of Premises A,
     Premises B and Premises C.  Such plans for each of Premises A, Premises B
     and Premises C shall be referred to herein as the "Premises A Plans", the
     "Premises B Plans" and the "Premises C Plans", respectively, and shall be
     collectively referred to herein as the "Plans".  Landlord shall advise
     Tenant in writing within 5 Business Days after Landlord's receipt of
     Tenant's design plans for each of Premises A, Premises B and Premises C, as
     applicable, and within 10 Business Days after
<PAGE>

     Landlord's receipt of final construction plans for each of Premises A,
     Premises B and Premises C, as applicable, if the Landlord disapproves such
     design plans or final construction plans. If Landlord disapproves the
     applicable design plans or final construction plans, then within 2 Business
     Days after Tenant's receipt of such disapproval, Tenant shall cause the
     applicable design plans or final construction plans, as the case may be, to
     be revised to correct any such problems identified by Landlord that
     Landlord may require. Tenant shall be responsible for all elements of the
     design of Tenant's plans (including, without limitation, compliance with
     law, functionality of design, the structural integrity of the design, the
     configuration of the Premises and the placement of Tenant's furniture,
     appliances and equipment), and Landlord's approval of Tenant's plans shall
     in no event relieve Tenant of the responsibility for such design. Landlord
     hereby agrees (subject to Landlord's prior review and approval of the same,
     which approval shall not be unreasonably withheld) that (i) Tenant shall
     not be required to use or purchase building standard materials (except for
     building standard locksets) in connection with the Landlord Work, (ii)
     Tenant may install ambient lighting, and (iii) Tenant shall have the right
     to remove (or not install) the building standard ceiling grid or acoustical
     tiles in the Premises. If requested by Tenant, Landlord's architect will
     prepare the Plans necessary for such construction at Tenant's cost. Whether
     or not the layout and Plans are prepared with the help (in whole or in
     part) of Landlord's architect, Tenant agrees to remain solely responsible
     for the timely preparation and submission of the Plans and for all elements
     of the design of such Plans and for all costs related thereto. Tenant has
     assured itself by direct communication with the architect and engineers
     (Landlord's or its own, as the case may be) that (a) the final approved
     Premises A Plans can be delivered to Landlord on or before February 18,
     2000 (the "Premises A Plans Due Date"), (b) the final approved Premises B
     Plans can be delivered to Landlord on or before February 25, 2000 (the
     "Premises B Plans Due Date"), and (c) the final approved Premises C Plans
     can be delivered to Landlord on or before March 24, 2000 (the "Premises C
     Plans Due Date"); provided that Tenant promptly furnishes complete
     information concerning its requirements to said architect and engineers as
     and when requested by them. The Premises A Plans Due Date, the Premises B
     Plans Due Date and the Premises C Plans Due Date are individually referred
     to herein as a "Plans Due Date". Tenant covenants and agrees to cause the
     final, approved Plans for Premises A, Premises B and Premises C to be
     delivered to Landlord on or before each applicable Plans Due Date and to
     devote such time as may be necessary in consultation with said architect
     and engineers to enable them to complete and submit the Plans for Premises
     A, Premises B and Premises C within the required time limit. Time is of the
     essence in respect of preparation and submission of Plans by Tenant. In the
     event the Plans for Premises A, Premises B or Premises C are not fully
     completed and approved by the applicable Plans Due Date, Tenant shall be
     responsible for 1 day of Tenant Delay (as defined in the Lease) for each
     day during the period beginning on the day following the applicable Plans
     Due Date and ending on the date completed Plans for Premises A, Premises B
     or Premises C, as the case may be, are approved. (The word "architect" as
     used in this Exhibit D shall include an interior designer or space
     planner.)

3.   In the event Landlord's estimate and/or the actual cost of construction
     shall exceed the Allowance, Landlord, prior to commencing any construction
     of Landlord Work, shall submit to Tenant a written estimate setting forth
     the anticipated cost of the Landlord Work, including but not limited to
     labor and materials, contractor's fees and permit fees.  Within 3 Business
     Days thereafter, Tenant shall either notify Landlord in writing of its
     approval of the cost estimate, or specify its objections thereto and any
     desired changes to the proposed Landlord Work.  In the event Tenant
     notifies Landlord of such objections and desired changes, Tenant shall work
     with Landlord to reach a mutually acceptable alternative cost estimate.

4    In the event Landlord's estimate and/or the actual cost of construction
     shall exceed the Allowance, if any (such amounts exceeding the Allowance
     being herein referred to as the "Excess Costs"), Tenant shall pay to
     Landlord such Excess Costs, plus any applicable state sales or use tax
     thereon within 30 days after presentation of invoice to Tenant.  Landlord
     shall determine the Excess Costs applicable to each of Premises A, Premises
     B and Premises C by determining the total cost of performing the Landlord
     Work for each of Premises A,
<PAGE>

     Premises B and Premises C, and deducting the allocable share of the
     Allowance attributable to Premises A, Premises B and Premises C as provided
     in Paragraph 7 below. Landlord agrees not to demand payment of the Excess
     Costs attributable to Premises A, Premises B or Premises C until such time
     as Landlord reasonably determines that the allocable share of the Allowance
     for Premises A, Premises B or Premises C, as the case may be, has nearly
     been exhausted toward the performance of the Landlord Work. The statements
     of costs submitted to Landlord by Landlord's contractors shall be
     conclusive for purposes of determining the actual cost of the items
     described therein. The amounts payable by Tenant hereunder constitute Rent
     payable pursuant to the Lease, and the failure to timely pay same
     constitutes an event of default under the Lease.

5.   If Tenant shall request any change, addition or alteration in any of the
     Plans after approval by Landlord, Landlord shall have such revisions to the
     drawings prepared, and Tenant shall reimburse Landlord for the cost
     thereof, plus any applicable state sales or use tax thereon, upon demand.
     Promptly upon completion of the revisions, Landlord shall notify Tenant in
     writing of the increased cost which will be chargeable to Tenant by reason
     of such change, addition or deletion.  Tenant, within 2 Business Days,
     shall notify Landlord in writing whether it desires to proceed with such
     change, addition or deletion.  In the absence of such written
     authorization, Landlord shall have the option to continue work on the
     Premises disregarding the requested change, addition or alteration, or
     Landlord may elect to discontinue work on the Premises until it receives
     notice of Tenant's decision, in which event Tenant shall be responsible for
     any Delay in completion of the Premises resulting therefrom.  In the event
     such revisions result in a higher estimate of the cost of construction
     and/or higher actual construction costs which exceed the Allowance, such
     increased estimate or costs shall be deemed Excess Costs pursuant to
     Paragraph 4 hereof and Tenant shall pay such Excess Costs, plus any
     applicable state sales or use tax thereon, upon demand.

6.   Following approval of the Plans and the payment by Tenant of the required
     portion of the Excess Costs, if any, Landlord shall cause the Landlord Work
     to be constructed substantially in accordance with the approved Plans.
     Landlord shall use its reasonable efforts to notify Tenant prior to the
     substantial completion of the Landlord Work.

7.   Landlord, provided Tenant is not in default, agrees to provide Tenant with
     an allowance (the "Allowance") in an amount not to exceed $36.50 per
     rentable square foot of the Premises to be applied toward the cost of the
     Landlord Work in the Premises.  In the event the Allowance shall not be
     sufficient to complete the Landlord Work, Tenant shall pay the Excess
     Costs, plus any applicable state sales or use tax thereon, as prescribed in
     Paragraph 4 above.  In the event the Allowance exceeds the cost of Landlord
     Work, any remaining Allowance not utilized in connection with the Landlord
     Work on or before December 31, 2000 shall accrue to the sole benefit of
     Landlord, it being agreed that Tenant shall not be entitled to any credit,
     offset, abatement or payment with respect thereto.  The Allowance shall be
     allocated by Landlord to each of Premises A, Premises B and Premises C such
     that each of Premises A, Premises B and Premises C shall receive its pro
     rata share of the Allowance based on the ratio of its Rentable Square
     Footage to the Rentable Square Footage of the entire Premises.

8.   This Exhibit D shall not be deemed applicable to any additional space added
     to the original Premises at any time or from time to time, whether by any
     options under the Lease or otherwise, or to any portion of the original
     Premises or any additions to the Premises in the event of a renewal or
     extension of the original Term of this Lease, whether by any options under
     the Lease or otherwise, unless expressly so provided in the Lease or any
     amendment or supplement to the Lease.
<PAGE>

     Landlord and Tenant have executed this exhibit as of the day and year first
above written.

                             LANDLORD:

                             EOP-150 CALIFORNIA STREET, L.L.C., a Delaware
                             limited liability company

                             By: EOP Operating Limited Partnership, a Delaware
                                 limited partnership, its sole member

                                 By: Equity Office Properties Trust, a Maryland
                                     real estate investment trust, its managing
                                     general partner

                                     By: /s/ Peter H. Adams
                                        ----------------------------------

                                     Name: Peter H. Adams
                                          --------------------------------

                                     Title: Senior Vice President
                                           -------------------------------

                                     TENANT:

                                     TENFOLD CORPORATION, a Delaware corporation

                                     By: /s/ Robert P. Hughes
                                        ----------------------------------
                                     Name: Robert P. Hughes
                                          --------------------------------
                                     Title: Chief Financial Officer
                                           -------------------------------

                                     By: /s/ Gary D. Kennedy
                                        ----------------------------------
                                     Name: Gary D. Kennedy
                                          --------------------------------
                                     Title: President and Chief Executive
                                            ------------------------------
                                            Officer
                                            ------------------------------
<PAGE>

                                  EXHIBIT D-1

                            SUMMARY OF FINAL PLANS
                            ----------------------

     This Exhibit is attached to and made a part of the Lease dated as of March
3, 2000, by and between EOP-150 CALIFORNIA STREET, L.L.C., a Delaware limited
liability company ("Landlord") and TENFOLD CORPORATION, a Delaware corporation
("Tenant") for space in the Building located at 150 California Street, San
Francisco, California.

     The Base Building Work includes the following improvements:

1.   HVAC System.

     a.   The Building will have 2 central fan systems which shall deliver
          cooling and ventilation air to all office floors.  Floors 2 through 13
          will be served from a fan system located at Level 5, while Floors 14
          through 23 will be served from a fan system located at the roof
          penthouse.

          The central fan systems will be sized for the cooling load imposed by
          the building envelope, lights, people and miscellaneous receptacle
          loads (PC's, printers, etc.) of 2.5 watts per square foot of tenant
          floor area.  The central fan systems will have an "air economizer
          cycle" which uses outside air for cooling.

     b.   Cooling will be provided by 2 chillers and 2 cooling towers located at
          the roof penthouse.

     c.   Heating will be provided by 2 boilers located at the roof penthouse,
          and by heating water coils at tenant provided VAV boxes serving the
          perimeter areas of each tenant floor.

     d.   Each tenant floor will receive air from the central fan system during
          Normal Business Hours.

     e.   Tenant may install a water-cooled air conditioning unit and
          circulating pump for supplemental air conditioning on a 24-hour basis.
          Connection to be made by Tenant to a set of condenser water pipe
          risers, which will have valved stub-outs on each tenant floor.  Tenant
          will be charged on a pro rata basis (at such rate as is reasonably
          determined by Landlord) for running the central cooling towers, as
          necessary, after Normal Business Hours.  This tenant condenser water
          system will be sized for 2 watts per square foot of tenant floor area,
          or 9 tons per floor, over and above the cooling provided by the
          central fan systems.  Tenant shall have the right to reallocate the
          condenser water among the floors of the Premises, provided that Tenant
          shall not exceed the total available capacity and Tenant installs any
          new taps at Tenant's expense.

     f.   Tenant's mechanical engineer is required to verify that total loads,
          including building envelope loads, can be met with the existing system
          capacities.  Tenant loads in excess of the available capacity will
          require supplemental air conditioning that is to be supplied by the
          Tenant.

     g.   Landlord shall provide fully functioning HVAC and VAV boxes for one
          bathroom for each gender on each floor of the Premises and for the
          6/th/ floor elevator lobby only.

2.   Electrical Systems.

     a.   The Building will be served by 480Y/277 volt.  The electric service
          will consist of a 4000A bus to serve the building and office tenant
          loads, a fire pump service and a 400A service to serve the retail
          tenant loads.

     b.   A bus duct riser at 480Y/227 volt will have a capacity of 7.0 volt-
          amperes per net rentable square foot for office tenant loads.  Local
          480V-208Y/120V, 3 phase, 4 wire will have a capacity of 2.5 volt-
          amperes per net rentable square foot to serve tenant equipment and
          receptacle loads.
<PAGE>

     c.   A 480Y/277V, 3 phase, 4 wire panelboard will be provided at each floor
          for lighting loads.  A 208Y/120V, 3 phase, 4 wire panelboard will be
          provided at each floor for equipment and receptacle loads.

     d.   Tenant lighting and lighting controls to be provided by Tenant.
          Tenant may install ambient lighting in the Premises subject to
          Landlord's reasonable review and approval of the same.

     e.   A telephone/data closet will be provided at each floor for tenant/data
          service.

     f.   24 circuits per each floor of the Premises will be delivered by
          Landlord for power usage and 6 circuits per each floor of the Premises
          will be delivered by Landlord for lighting purposes.

3.   Fire Protection in Premises.

     a.   All exposed decks, columns and beams will have fireproofing in
          accordance with City of San Francisco building codes.

     b.   Automatic sprinkler system piping will be connected to the existing
          system riser, including flow and damper switches and riser drains.
          Smoke detectors, main loop and minimum distribution piping will
          provide required system density for shell space per City of San
          Francisco building codes.  Sprinkler system piping relocation and
          sprinkler head installation will be the responsibility of Tenant.

     c.   The Building's fire alarm system low voltage power supply shall have
          sufficient capacity to connect to all strobes in the Premises required
          by applicable codes.

4.   Condition of Premises.:

     Drywall (taped, sanded and finish-ready) at all core locations in the
     Premises, columns exposed, ceiling exposed to structure, concrete slab
     exposed, exit signs per shell code, HVAC main duct trunk run stubbed out to
     a predetermined location, upright fire sprinklers, fire extinguisher
     cabinets, window sills painted.

5.   Elevator Lobby on Premises Floors.

     Drywall (taped, sanded and finish-ready) in elevator lobby area, ceiling
     exposed to structure, concrete slab exposed, exit signs per shell code,
     pendent fire sprinklers.

6.   Toilet Rooms in Premises.

     Granite counters with undermount sinks, tile floor and base, full height
     tile at wet walls, wall covering at other walls, metal toilet partitions,
     wood door at entry, down lights/cove light at wet wall/sconce light at
     mirror, HVAC diffusers with VAV boxes, toilet room accessories, pendent
     fire sprinklers.  Interior lights to be tied to a motion sensor.  Toilet
     rooms in the Premises shall comply with the requirements of Title III of
     the ADA as of the date possession of each applicable portion of the
     Premises is initially tendered to Tenant.

7.   Electrical/Telecom Rooms on Premises Floors.

     Drywall (taped, sanded and finish-ready) in electrical/telecom area,
     ceiling exposed to structure, concrete slab exposed, fluorescent utility
     lighting, HVAC per shell code, pendent fire sprinklers.  One (1) lighting
     panel and one (1) power panel per floor.

8.   Soffit/Sheetrock.

     Landlord shall value engineer, design and construct the permanent drywall
     Soffit at the building windowline.  Landlord shall finish out and sheetrock
     all exterior walls in the Premises.  This work shall not include the
     columns.

9.   Window Coverings.
<PAGE>

     Landlord shall provide and install Building Standard window coverings for
     the Premises in accordance with the General Contractor's schedule.
     However, the cost of such window coverings shall be borne by Tenant.

     IN WITNESS WHEREOF, Landlord and Tenant have executed this exhibit as of
the day and year first above written.

                              LANDLORD:

                              EOP-150 CALIFORNIA STREET, L.L.C., a Delaware
                              limited liability company

                              By: EOP Operating Limited Partnership, a Delaware
                                  limited partnership, its sole member

                                     By: Equity Office Properties Trust, a
                                         Maryland real estate investment trust,
                                         its managing general partner

                                         By: /s/ Peter H. Adams
                                            ---------------------------

                                         Name: Peter H. Adams
                                              -------------------------

                                         Title: Senior Vice President
                                               -------------------------

                                     TENANT:

                                     TENFOLD CORPORATION, a Delaware corporation

                                     By:    /s/ Robert P. Hughes
                                        ----------------------------------
                                     Name:  Robert P. Hughes
                                          --------------------------------
                                     Title: Chief Financial Officer
                                           -------------------------------

                                     By:    /s/ Gary D. Kennedy
                                        ----------------------------------
                                     Name:  Gary D. Kennedy
                                          --------------------------------
                                     Title: President and Chief Executive
                                           -------------------------------
                                            Officer
                                            -------
<PAGE>

                                   EXHIBIT E

                             ADDITIONAL PROVISIONS
                             ---------------------

     This Exhibit is attached to and made a part of the Lease dated as of March
3, 2000, by and between EOP-150 CALIFORNIA STREET, L.L.C., a Delaware limited
liability company ("Landlord") and TENFOLD CORPORATION, a Delaware corporation
("Tenant") for space in the Building located at 150 California Street, San
Francisco, California.

I.   FIRST RENEWAL OPTION.

     A.   Tenant shall have the right to extend the Term (the "First Renewal
          Option") for one additional period of 5 years commencing on the day
          following the Termination Date of the initial Term and ending on the
          5/th/ anniversary of the Termination Date (the "First Renewal Term"),
          if:

          1.   Landlord receives notice of exercise of the First Renewal Option
               ("Initial First Renewal Notice") not less than 9 full calendar
               months prior to the expiration of the initial Term and not more
               than 12 full calendar months prior to the expiration of the
               initial Term; and

          2.   Tenant is not in default under the Lease beyond any applicable
               cure periods at the time that Tenant delivers its Initial First
               Renewal Notice or at the time Tenant delivers its First Binding
               Notice (as hereinafter defined); and

          3.   No part of the Premises is sublet (other than pursuant to a
               Permitted Transfer) at the time that Tenant delivers its Initial
               First Renewal Notice or at the time Tenant delivers its First
               Binding Notice; and

          4.   The Lease has not been assigned (other than pursuant to a
               Permitted Transfer) prior to the date that Tenant delivers its
               Initial First Renewal Notice or prior to the date Tenant delivers
               its First Binding Notice.

     B.   The initial Base Rent rate per rentable square foot for the Premises
          during the First Renewal Term shall equal the Prevailing Market
          (hereinafter defined) rate per rentable square foot for the Premises.

     C.   Tenant shall pay Additional Rent (i.e. Expenses and Taxes) for the
          Premises during the First Renewal Term in accordance with Article IV
          of the Lease.

     D.   Within 30 days after receipt of Tenant's Initial First Renewal Notice,
          Landlord shall advise Tenant of the applicable Base Rent rate for the
          Premises for the First Renewal Term.  Tenant, within 15 days after the
          date on which Landlord advises Tenant of the applicable Base Rent rate
          for the First Renewal Term, shall either (i) give Landlord final
          binding written notice ("First Binding Notice") of Tenant's exercise
          of its option, or (ii) if Tenant disagrees with Landlord's
          determination, provide Landlord with written notice of rejection (the
          "First Rejection Notice").  If Tenant fails to provide Landlord with
          either a First Binding Notice or First Rejection Notice within such 15
          day period, Tenant's First Renewal Option shall be null and void and
          of no further force and effect.  If Tenant provides Landlord with a
          First Binding Notice, Landlord and Tenant shall enter into the First
          Renewal Amendment (hereinafter defined) upon the terms and conditions
          set forth herein.  If Tenant provides Landlord with a First Rejection
          Notice, Landlord and Tenant shall work together in good faith to agree
          upon the Prevailing Market Base Rent rate for the Premises during the
          First Renewal Term.  Upon agreement Tenant shall provide Landlord with
          First Binding Notice and Landlord and Tenant shall enter into the
          First Renewal Amendment in accordance with the terms and conditions
          hereof.  Notwithstanding the foregoing, if Landlord and Tenant are
          unable to agree upon the Prevailing Market Base Rent rate for the
          Premises within 30 days after the date on which Tenant provides
          Landlord with a First Rejection Notice, Tenant's First Renewal Option
          shall be null and void and of no force and effect.
<PAGE>

     E.   If Tenant is entitled to and properly exercises its First Renewal
          Option, Landlord shall prepare an amendment (the "First Renewal
          Amendment") to reflect changes in the Base Rent, Term, Termination
          Date and other appropriate terms.  The First Renewal Amendment shall
          be:

          1.   sent to Tenant within a reasonable time after receipt of the
               First Binding Notice; and

          2.   executed by Tenant and returned to Landlord within 15 Business
               Days after its submission to Tenant.

          An otherwise valid exercise of the First Renewal Option shall, at
          Landlord's option, be fully effective whether or not the First Renewal
          Amendment is executed.

     F.   For purposes of this First Renewal Option, "Prevailing Market" shall
          mean the arms length fair market annual rental rate per rentable
          square foot under renewal leases and amendments entered into on or
          about the date on which the Prevailing Market is being determined
          hereunder for space comparable to the Premises in the Building and
          office buildings comparable to the Building in the downtown financial
          district of San Francisco, California.  The determination of
          Prevailing Market shall take into account any material economic
          differences between the terms of this Lease and any comparison lease,
          such as rent abatements, allowances, construction costs and other
          concessions and the manner, if any, in which the Landlord under any
          such lease is reimbursed for operating expenses and taxes.  The
          determination of Prevailing Market shall also take into consideration
          any reasonably anticipated changes in the Prevailing Market rate from
          the time such Prevailing Market rate is being determined and the time
          such Prevailing Market rate will become effective under this Lease.

     G.   Landlord and Tenant acknowledge and agree that Tenant's First Renewal
          Option is personal to Tenant only and not transferable to any other
          entity (except in connection with a Permitted Transfer) and in no
          event shall be exercisable by Tenant on behalf of any potential
          assignees or sublessees (except in connection with a Permitted
          Transfer).

II.  SECOND RENEWAL OPTION.

     A.   Tenant shall have the right to extend the Term (the "Second Renewal
          Option") for an additional period of 3 years commencing on the day
          following the Termination Date of the First Renewal Term and ending on
          the 3/rd/ anniversary of the Termination Date of the First Renewal
          Term (the "Second Renewal Term"), if:

          1.   Landlord receives notice of exercise of the Second Renewal Option
               ("Initial Second Renewal Notice") not less than 9 full calendar
               months prior to the expiration of the First Renewal Term and not
               more than 12 full calendar months prior to the expiration of the
               First Renewal Term; and

          2.   Tenant is not in default under the Lease beyond any applicable
               cure periods at the time that Tenant delivers its Initial Second
               Renewal Notice or at the time Tenant delivers its Second Binding
               Notice (as hereinafter defined); and

          3.   No part of the Premises is sublet (other than in connection with
               a Permitted Transfer) at the time that Tenant delivers its
               Initial Second Renewal Notice or at the time Tenant delivers its
               Second Binding Notice; and

          4.   The Lease has not been assigned (other than in connection with a
               Permitted Transfer) prior to the date that Tenant delivers its
               Initial Second Renewal Notice or prior to the date Tenant
               delivers its Second Binding Notice; and

          5.   Tenant has exercised its First Renewal Option in accordance with
               the terms and provisions of Section I above.
<PAGE>

     B.   The initial Base Rent rate per rentable square foot for the Premises
          during the Second Renewal Term shall equal the Prevailing Market
          (hereinafter defined) rate per rentable square foot for the Premises.

     C.   Tenant shall pay Additional Rent (i.e. Expenses and Taxes) for the
          Premises during the Second Renewal Term in accordance with Article IV
          of the Lease.

     D.   Within 30 days after receipt of Tenant's Initial Second Renewal
          Notice, Landlord shall advise Tenant of the applicable Base Rent rate
          for the Premises for the Second Renewal Term.  Tenant, within 15 days
          after the date on which Landlord advises Tenant of the applicable Base
          Rent rate for the Second Renewal Term, shall either (i) give Landlord
          final binding written notice ("Second Binding Notice") of Tenant's
          exercise of its option, or (ii) if Tenant disagrees with Landlord's
          determination, provide Landlord with written notice of rejection (the
          "Second Rejection Notice").  If Tenant fails to provide Landlord with
          either a Second Binding Notice or Second Rejection Notice within such
          15 day period, Tenant's Second Renewal Option shall be null and void
          and of no further force and effect.  If Tenant provides Landlord with
          a Second Binding Notice, Landlord and Tenant shall enter into the
          Second Renewal Amendment (as hereinafter defined) upon the terms and
          conditions set forth herein.  If Tenant provides Landlord with a
          Second Rejection Notice, Landlord and Tenant shall work together in
          good faith to agree upon the Prevailing Market Base Rent rate for the
          Premises during the Second Renewal Term.  Upon agreement Tenant shall
          provide Landlord with Second Binding Notice and Landlord and Tenant
          shall enter into the Second Renewal Amendment in accordance with the
          terms and conditions hereof.  Notwithstanding the foregoing, if
          Landlord and Tenant are unable to agree upon the Prevailing Market
          Base Rent rate for the Premises within 30 days after the date on which
          Tenant provides Landlord with a Second Rejection Notice, Tenant's
          Second Renewal Option shall be null and void and of no force and
          effect.

     E.   If Tenant is entitled to and properly exercises its Second Renewal
          Option, Landlord shall prepare an amendment (the "Second Renewal
          Amendment") to reflect changes in the Base Rent, Term, Termination
          Date and other appropriate terms.  The Second Renewal Amendment shall
          be:

          1.   sent to Tenant within a reasonable time after receipt of the
               Second Binding Notice; and

          2.   executed by Tenant and returned to Landlord within 15 Business
               Days after its submission to Tenant.

          An otherwise valid exercise of the Second Renewal Option shall, at
          Landlord's option, be fully effective whether or not the Second
          Renewal Amendment is executed.

     F.   For purposes of this Second Renewal Option, "Prevailing Market" shall
          mean the arms length fair market annual rental rate per rentable
          square foot under renewal leases and amendments entered into on or
          about the date on which the Prevailing Market is being determined
          hereunder for space comparable to the Premises in the Building and
          office buildings comparable to the Building in the downtown financial
          district of San Francisco, California.  The determination of
          Prevailing Market shall take into account any material economic
          differences between the terms of this Lease and any comparison lease,
          such as rent abatements, allowances, construction costs and other
          concessions and the manner, if any, in which the Landlord under any
          such lease is reimbursed for operating expenses and taxes.  The
          determination of Prevailing Market shall also take into consideration
          any reasonably anticipated changes in the Prevailing Market rate from
          the time such Prevailing Market rate is being determined and the time
          such Prevailing Market rate will become effective under this Lease.

     G.   Landlord and Tenant acknowledge and agree that Tenant's Second Renewal
          Option is personal to Tenant only and not transferable to any other
          entity (except in connection with a Permitted Transfer) and in no
          event shall be exercisable by
<PAGE>

          Tenant on behalf of any potential assignees or sublessees (except in
          connection with a Permitted Transfer).

III. ELEVATOR BANK IDENTITY SIGNAGE.
     -------------------------------

     A.   If Tenant occupies at least 60,000 rentable square feet within the
          low-rise elevator bank of the Building which services floors 2-11,
          Landlord, at Tenant's sole cost and expense, shall erect one exclusive
          sign identifying Tenant (the "Sign") on the ground floor Building
          lobby wall within the low-rise elevator bank lobby, the exact location
          of which Sign shall be determined in Landlord's reasonable judgment.
          The Sign shall substantially conform to the design of Tenant's logo,
          as shown on Exhibit E-1 attached hereto.  Notwithstanding the
          foregoing to the contrary, if at any time during the Term Tenant
          enters into one or more subleases with respect to the Premises with
          terms of 2 years or less each (the "Short Term Subleases"), and so
          long as Tenant still occupies at least 49,000 rentable square feet of
          the Premises, the Sign shall remain in its position within the low-
          rise elevator bank lobby  If, at any time during the Term, Tenant
          enters into Short Term Sublease(s) with respect to the Premises and
          Tenant occupies between 40,000 rentable square feet and 48,999
          rentable square feet of the Premises, or if at any time during the
          Term Tenant enters into subleases (other than Short Term Subleases)
          and Tenant occupies more than 40,000 rentable square feet, Tenant's
          right to the exclusive low-rise elevator bank lobby signage shall
          become a non-exclusive right.  If, at any time during the Term, Tenant
          occupies less than 40,000 rentable square feet of the Premises,
          Tenant's right to erect low-rise elevator bank lobby signage shall be
          revoked.  Within a reasonable time after its execution of this Lease,
          Tenant shall submit detailed drawings of its proposed Sign to
          Landlord, which drawings shall be subject to Landlord's review and
          approval.  Such drawings shall include, without limitation, detailed
          information concerning the size, material, shape, color, lettering,
          and method of installation of the proposed Sign.  All maintenance and
          repair of the Sign shall be at Tenant's sole cost and expense.

     B.   Landlord, upon the expiration date or sooner termination of this
          Lease, shall have the right to remove the Sign at Tenant's sole cost
          and expense.  In addition, Landlord, at Tenant's sole cost and
          expense, shall have the right to remove the Sign if, at any time
          during the Term (1) Tenant's signage rights are revoked as provided in
          Paragraph A above, or (2) Tenant defaults under any term or condition
          of the Lease and fails to cure such default within any applicable
          grace period.  Tenant acknowledges and agrees that the rights
          contained herein in connection with the Sign are personal to Tenant
          and in no event shall the rights contained herein be transferred or
          assigned.

IV.  CONSTRUCTION OF ELEVATOR LOBBIES.  Tenant shall be responsible for
     construction of the elevator lobbies and corridor finishes on the 2/nd/,
     3/rd/, 4/th/, 5/th/, 7/th/ and 8/th/ floors within the Premises.  Tenant
     shall provide Landlord with detailed drawings of Tenant's proposed
     construction of the 2/nd/, 3/rd/, 4/th/, 5/th/, 7/th/ and 8/th/ floor
     elevator lobbies for Landlord's review and approval.  Landlord shall be
     responsible for the construction of the lobby and corridor finishes with
     respect to the 6/th/ floor of the Premises only.

V.   ROOF ANTENNA.

     A.   Subject to availability (as determined by Landlord in Landlord's sole
          discretion), Tenant shall have the option to lease space on the roof
          of the Building for the purpose of installing (in accordance with
          Section IX.C of the Lease), operating and maintaining a dish, antenna
          or other communication device not to exceed 2 meters in diameter (the
          "Dish/Antenna"), if (i) Landlord receives written notice ("Dish
          Notice") of Tenant's exercise of the Dish Option (the "Dish Option")
          from Tenant specifying (a) the type of Dish/Antenna Tenant desires to
          install and (b) the date Tenant desires to commence the operation of
          the Dish/Antenna, provided that such notice is delivered to Landlord
          not less than one hundred twenty (120) days prior to the date Tenant
          desires to install and commence operations of the Dish/Antenna; (ii)
          Tenant is not in default under the Lease beyond any applicable cure
          periods at the time that Tenant delivers its Dish Notice; (iii) no
          portion of the Premises is sublet (other than any sublease(s) entered
          into pursuant to a Permitted Transfer) at the time that Tenant
          delivers its Dish Notice; (iv) the Lease has not been assigned (other
          than pursuant to a
<PAGE>

          Permitted Transfer) prior to the date that Tenant delivers its Dish
          Notice; and (v) Landlord approves of the type and size of Dish/Antenna
          which Tenant desires to install (provided that such approval shall not
          be unreasonably withheld, conditioned or delayed).

          Tenant shall pay monthly rent for the Dish/Antenna based upon the
          Landlord's reasonable determination of the then prevailing rate for
          comparable dish/antennas at the Building (the "Dish/Antenna Payments")
          The Dish/Antenna Payments shall commence on a commencement date to be
          mutually agreed upon by Landlord and Tenant and shall constitute
          Additional Rent under the terms of the Lease and Tenant shall be
          required to make these payments in strict compliance with the terms of
          Section IV of the Lease.  The exact location of the space on the roof
          to be leased by Tenant shall be designated by Landlord and shall not
          exceed 10 square feet (the "Roof Space").  Landlord reserves the right
          to relocate the Roof Space as reasonably necessary during the Term.
          Landlord's designation shall take into account Tenant's use of the
          Dish/Antenna.  Notwithstanding the foregoing, Tenant's right to
          install the Dish/Antenna shall be subject to the approval rights of
          Landlord and Landlord's architect and/or engineer with respect to the
          plans and specifications of the Dish/Antenna, the manner in which the
          Dish/Antenna is attached to the roof of the Building and the manner in
          which any cables are run to and from the Dish/Antenna.  The precise
          specifications and a general description of the Dish/Antenna along
          with all documents Landlord reasonably requires to review the
          installation of the Dish/Antenna (the "Plans and Specifications")
          shall be submitted to Landlord for Landlord's written approval no
          later than 20 Business Days before Tenant commences to install the
          Dish/Antenna.  Tenant shall be solely responsible for obtaining all
          necessary governmental and regulatory approvals and for the cost of
          installing, operating, maintaining and removing the Dish/Antenna.
          Tenant shall notify Landlord upon completion of the installation of
          the Dish/Antenna.  If Landlord determines that the Dish/Antenna
          equipment does not comply with the approved Plans and Specifications,
          that the Building has been damaged during installation of the
          Dish/Antenna or that the installation was defective, Landlord shall
          notify Tenant of any noncompliance or detected problems and Tenant
          immediately shall cure the defects.  If the Tenant fails to
          immediately cure the defects, Tenant shall pay to Landlord upon demand
          the cost, as reasonably determined by Landlord, of correcting any
          defects and repairing any damage to the Building caused by such
          installation.  If at any time Landlord, in its sole discretion,  deems
          it necessary, Tenant shall provide and install, at Tenant's sole cost
          and expense, appropriate aesthetic screening, reasonably satisfactory
          to Landlord, for the Dish/Antenna (the "Aesthetic Screening").

     B.   Landlord agrees that Tenant, upon reasonable prior written notice to
          Landlord, shall have access to the roof of the Building and the Roof
          Space for the purpose of installing, maintaining, repairing and
          removing the Dish/Antenna, the appurtenances and the Aesthetic
          Screening, if any, all of which shall be performed by Tenant or
          Tenant's authorized representative or contractors, which shall be
          approved by Landlord, at Tenant's sole cost and  risk. It is agreed,
          however, that only authorized engineers, employees or properly
          authorized contractors of Tenant, FCC inspectors, or persons under
          their direct supervision will be permitted to have access to the roof
          of the Building and the Roof Space.  Tenant further agrees to exercise
          firm control over the people requiring access to the roof of the
          Building and the Roof Space in order to keep to a minimum the number
          of people having access to the roof of the Building and the Roof Space
          and the frequency of their visits.

     C.   It is further understood and agreed that the installation,
          maintenance, operation and removal of the Dish/Antenna, the
          appurtenances and the Aesthetic Screening, if any, is not permitted to
          damage the Building or the roof thereof, or interfere with the use of
          the Building and roof by Landlord.  Tenant agrees to be responsible
          for any damage caused to the roof or any other part of the Building,
          which may be caused by Tenant or any of its agents or representatives.

     D.   Tenant agrees to install only equipment of types and frequencies which
          will not cause unreasonable interference to Landlord or existing
          tenants of the Building.  In the event Tenant's equipment causes such
          interference, Tenant will change
<PAGE>

          the frequency on which it transmits and/or receives and take any other
          steps necessary to eliminate the interference. If said interference
          cannot be eliminated within a reasonable period of time, in the
          judgment of Landlord, then Tenant agrees to remove the Dish/Antenna
          from the Roof Space.

     E.   Tenant shall, at its sole cost and expense, and at its sole risk,
          install, operate and maintain the Dish/Antenna in a good and
          workmanlike manner, and in compliance with all Building, electric,
          communication, and safety codes, ordinances, standards, regulations
          and requirements, now in effect or hereafter promulgated, of the
          Federal Government, including, without limitation, the Federal
          Communications Commission (the "FCC"), the Federal Aviation
          Administration ("FAA") or any successor agency of either the FCC or
          FAA having jurisdiction over radio or telecommunications, and of the
          state, city and county in which the Building is located.  Under this
          Lease, the Landlord and its agents assume no responsibility for the
          licensing, operation and/or maintenance of Tenant's equipment.  Tenant
          has the responsibility of carrying out the terms of its FCC license in
          all respects.  The Dish/Antenna shall be connected to Landlord's power
          supply in strict compliance with all applicable Building, electrical,
          fire and safety codes.  Neither Landlord nor its agents shall be
          liable to Tenant for any stoppages or shortages of electrical power
          furnished to the Dish/Antenna or the Roof Space because of any act,
          omission or requirement of the public utility serving the Building, or
          the act or omission of any other tenant, invitee or licensee or their
          respective agents, employees or contractors, or for any other cause
          beyond the reasonable control of Landlord, and Tenant shall not be
          entitled to any rental abatement for any such stoppage or shortage of
          electrical power.  Neither Landlord nor its agents shall have any
          responsibility or liability for the conduct or safety of any of
          Tenant's representatives, repair, maintenance and engineering
          personnel while in or on any part of the Building or the Roof Space.

     F.   The Dish/Antenna, the appurtenances and the Aesthetic Screening, if
          any, shall remain the personal property of Tenant, and shall be
          removed by Tenant at its own expense at the expiration or earlier
          termination of this Lease or Tenant's right to possession hereunder.
          Tenant shall repair any damage caused by such removal, including the
          patching of any holes to match, as closely as possible, the color
          surrounding the area where the equipment and appurtenances were
          attached.  Tenant agrees to maintain all of the Tenant's equipment
          placed on or about the roof or in any other part of the Building in
          proper operating condition and maintain same in satisfactory condition
          as to appearance and safety in Landlord's sole discretion.  Such
          maintenance and operation shall be performed in a manner to avoid any
          interference with any other tenants or Landlord.  Tenant agrees that
          at all times during the Term, it will keep the roof of the Building
          and the Roof Space free of all trash or waste materials produced by
          Tenant or Tenant's agents, employees or contractors.

     G.   In light of the specialized nature of the Dish/Antenna, Tenant shall
          be permitted to utilize the services of its choice for installation,
          operation, removal and repair of the Dish/Antenna, the appurtenances
          and the Aesthetic Screening, if any, subject to the reasonable
          approval of Landlord.  Notwithstanding the foregoing, Tenant must
          provide Landlord with prior written notice of any such installation,
          removal or repair and coordinate such work with Landlord in order to
          avoid voiding or otherwise adversely affecting any warranties granted
          to Landlord with respect to the roof.  If necessary, Tenant, at its
          sole cost and expense, shall retain any contractor having a then
          existing warranty in effect on the roof to perform such work (to the
          extent that it involves the roof), or, at Tenant's option, to perform
          such work in conjunction with Tenant's contractor.  In the event the
          Landlord contemplates roof repairs that could affect Tenant's
          Dish/Antenna, or which may result in an interruption of the Tenant's
          telecommunication service, Landlord shall formally notify Tenant at
          least 30 days in advance (except in cases of an emergency) prior to
          the commencement of such contemplated work in order to allow Tenant to
          make other arrangements for such service.

     H.   Tenant shall not allow any provider of telecommunication, video, data
          or related services ("Communication Services") to locate any equipment
          on the roof of the Building or in the Roof Space for any purpose
          whatsoever, nor may Tenant use the Roof Space and/or Dish/Antenna to
          provide Communication Services to an
<PAGE>

          unaffiliated tenant, occupant or licensee of another building, or to
          facilitate the provision of Communication Services on behalf of
          another Communication Services provider to an unaffiliated tenant,
          occupant or licensee of the Building or any other building.

     I.   Tenant acknowledges that Landlord may at some time establish a
          standard license agreement (the "License Agreement") with respect to
          the use of roof space by tenants of the Building.  Tenant, upon
          request of Landlord, shall enter into such License Agreement with
          Landlord provided that such agreement does not materially alter the
          rights of Tenant hereunder with respect to the Roof Space.

     J.   Tenant specifically acknowledges and agrees that the terms and
          conditions of Article XIV of the Lease (Indemnity and Waiver of
          Claims) shall apply with full force and effect to the Roof Space and
          any other portions of the roof accessed or utilized by Tenant, its
          representatives, agents, employees or contractors.

     K.   If Tenant defaults under any of the terms and conditions of this
          Section or the Lease, and Tenant fails to cure said default within the
          time allowed by Article XIX of the Lease, Landlord shall be permitted
          to exercise all remedies provided under the terms of the Lease,
          including removing the Dish/Antenna, the appurtenances and the
          Aesthetic Screening, if any, and restoring the Building and the Roof
          Space to the condition that existed prior to the installation of the
          Dish/Antenna, the appurtenances and the Aesthetic Screening, if any.
          If Landlord removes the Dish/Antenna, the appurtenances and the
          Aesthetic Screening, if any, as a result of an uncured default, Tenant
          shall be liable for all costs and expenses Landlord incurs in removing
          the Dish/Antenna, the appurtenances and the Aesthetic Screening, if
          any, and repairing any damage to the Building, the roof of the
          Building and the Roof Space caused by the installation, operation or
          maintenance of the Dish/Antenna, the appurtenances, and the Aesthetic
          Screening, if any.
<PAGE>

     IN WITNESS WHEREOF, Landlord and Tenant have executed this exhibit as of
the day and year first above written.

                       LANDLORD:

                       EOP-150 CALIFORNIA STREET, L.L.C., a Delaware
                       limited liability company

                       By: EOP Operating Limited Partnership, a Delaware
                           limited partnership, its sole member

                           By: Equity Office Properties Trust, a Maryland
                               real estate investment trust, its managing
                               general partner

                               By:    /s/ Peter H. Adams
                                  ----------------------------
                               Name:  Peter H. Adams
                                    --------------------------
                               Title: Senior Vice President
                                     -------------------------

                       TENANT:

                       TENFOLD CORPORATION, a Delaware corporation

                       By:    /s/ Robert P. Hughes
                          -------------------------------------------
                       Name:  Robert P. Hughes
                            -----------------------------------------
                       Title: Chief Financial Officer
                             ----------------------------------------

                       By:    /s/ Gary D. Kennedy
                          -------------------------------------------
                       Name:  Gary D. Kennedy
                            -----------------------------------------
                       Title: President and Chief Executive Officer
                             ----------------------------------------
<PAGE>

                                  EXHIBIT E-1

                                 TENANT'S LOGO
                                 -------------
<PAGE>

                                   EXHIBIT F

                               PARKING AGREEMENT
                               -----------------

     This Exhibit is attached to and made a part of the Lease dated as of March
3, 2000, by and between EOP-150 CALIFORNIA STREET, L.L.C., a Delaware limited
liability company ("Landlord") and TENFOLD CORPORATION, a Delaware corporation
("Tenant") for space in the Building located at 150 California Street, San
Francisco, California.

1.   The parties acknowledge that they have heretofore entered, or are
     contemporaneously herewith entering into, a certain lease dated March 3,
     2000 (the "Lease") for the premises known as Suite Nos. 200, 300, 400, 500,
     600, 700 and 800 (the "Premises") located in the building known as 150
     California (the "Building").  In the event of any conflict between the
     Lease and this Parking Agreement, the latter shall control.

2.   Landlord hereby grants to Tenant and persons designated by Tenant a license
     to use 7 non-priority parking privileges in the parking facility ("Parking
     Facility") servicing the Building.  The term of such license shall commence
     on the Commencement Date under the Lease and shall continue until the
     earlier to occur of the Termination Date under the Lease (subject to
     extension or renewal rights as provided in the Lease), the sooner
     termination of the Lease, or Tenant's abandonment of the Premises
     thereunder.  During the term of this license, the charge for the parking
     privileges shall be the then prevailing monthly charge established from
     time to time for parking in the Parking Facility, payable in advance, with
     Tenant's payment of monthly Base Rent.  No deductions from the monthly
     charge shall be made for days on which the Parking Facility is not used by
     Tenant. Tenant may, from time to time request additional parking
     privileges, and if Landlord shall provide the same, such parking privileges
     shall be provided and used on a month-to-month basis, and otherwise on the
     foregoing terms and provisions, and at such prevailing monthly parking
     charges as shall be established from time to time.  Notwithstanding the
     foregoing to the contrary, any parking privileges granted herein or which
     may be subsequently granted under the provisions of this Parking Agreement
     may be revoked by Landlord at any time in the event Landlord reasonably
     determines that such revocation shall be necessary or desirable to comply
     with all applicable Laws and the provisions of any requirements of any
     applicable governmental authority.

3.   Tenant shall at all times comply with all applicable ordinances, rules,
     regulations, codes, laws, statutes and requirements of all federal, state,
     county and municipal governmental bodies or their subdivisions respecting
     the use of the Parking Facility.  Landlord reserves the right to adopt,
     modify and enforce reasonable rules ("Rules") governing the use of the
     Parking Facility from time to time including any key-card, sticker or other
     identification or entrance system and hours of operation provided that
     Tenant shall receive written notification of such exception and/or
     modification of rules at least 30 days prior to implementation.  The rules
     set forth herein are currently in effect.  Landlord may refuse to permit
     any person who violates such rules to park in the Parking Facility, and any
     violation of the rules shall subject the car to removal from the Parking
     Facility.

4.   Unless specified to the contrary above, the parking spaces hereunder shall
     be provided on a non-designated "first-come, first-served" basis.  Landlord
     and Tenant acknowledge and agree that as of the date of this Lease, it is
     currently contemplated that parking in the Parking Facility shall be
     performed through a valet service and that there may not be designated
     parking spaces in the Parking Facility.  Tenant acknowledges that Landlord
     has no liability for claims arising through acts or omissions of any
     Operator (as hereinafter defined) of the Parking Facility, if any.
     Landlord shall have no liability whatsoever for any damage to items located
     in the Parking Facility, nor for any personal injuries or death arising out
     of any matter relating to the Parking Facility, and in all events, Tenant
     agrees to look first to its insurance carrier and to require that Tenant's
     employees look first to their respective insurance carriers for payment of
     any losses sustained in connection with any use of the Parking Facility.
     Tenant hereby waives on behalf of its insurance carriers all rights of
     subrogation against Landlord or Landlord's agents.  Landlord reserves the
     right to assign specific parking spaces or privileges, and to reserve
     parking spaces or privileges for visitors, small cars, handicapped persons
     and for other tenants, guests of tenants or other parties, which assignment
     and reservation or spaces or privileges may be relocated as determined by
     Landlord from time to time, and Tenant and persons designated by Tenant
     hereunder shall not park in any location designated for such assigned or
     reserved parking spaces or privileges.  Tenant acknowledges that the
     Parking Facility may not be open and
<PAGE>

     operational as of the Commencement Date and that the Parking Facility may
     be closed entirely or in part in order to make repairs or perform
     maintenance services, or to alter, modify, re-stripe or renovate the
     Parking Facility, or if required by casualty, strike, condemnation, act of
     God, governmental law or requirement or other reason beyond the operator's
     reasonable control.

5.   If Tenant shall default under this Parking Agreement, the Landlord or the
     Operator, as the case may be, shall have the right to remove from the
     Parking Facility any vehicles hereunder which shall have been involved or
     shall have been owned or driven by parties involved in causing such
     default, without liability therefor whatsoever.  In addition, if Tenant
     shall default under this Parking Agreement, Landlord shall have the right
     to cancel this Parking Agreement on 30 days' written notice, unless within
     such 30 day period, Tenant cures such default.  If Tenant defaults with
     respect to the same term or condition under this Parking Agreement more
     than 3 times during any 12 month period, and Landlord notifies Tenant
     thereof promptly after each such default, the next default of such term or
     condition during the succeeding 12 month period, shall, at Landlord's
     election, constitute an incurable default.  Such cancellation right shall
     be cumulative and in addition to any other rights or remedies available to
     Landlord at law or equity, or provided under the Lease (all of which rights
     and remedies under the Lease are hereby incorporated herein, as though
     fully set forth).  Any default by Tenant under the Lease shall be a default
     under this Parking Agreement, and any default under this Parking Agreement
     shall be a default under the Lease.

                                     RULES

     (i)    Parking Facility hours shall be 7:00 a.m. to 6:00 p.m., however,
            Tenant shall have access to the Parking Facility on a 24 hour basis,
            7 days a week. Tenant shall not store or permit its employees to
            store any automobiles in the Parking Facility without the prior
            written consent of the Landlord. Except for emergency repairs,
            Tenant and its employees shall not perform any work on any
            automobiles while located in the Parking Facility, or on the
            Property. If it is necessary for Tenant or its employees to leave an
            automobile in the Parking Facility overnight, Tenant shall provide
            the Landlord with prior notice thereof designating the license plate
            number and model of such automobile.

     (ii)   Cars must be parked entirely within the stall lines painted on the
            floor, and only small cars may be parked in areas reserved for small
            cars.

     (iii)  All directional signs and arrows must be observed.

     (iv)   The speed limit shall be 5 miles per hour.

     (v)    Parking spaces or privileges reserved for handicapped persons must
            be used only by vehicles properly designated.

     (vi)   Parking is prohibited in all areas not expressly designated for
            parking, including without limitation:

            (a)  Areas not striped for parking
            (b)  aisles
            (c)  where "no parking" signs are posted
            (d)  ramps
            (e)  loading zones

     (vii)  Parking stickers, key cards or any other devices or forms of
            identification or entry supplied by the Landlord or the Operator, as
            the case may be, shall remain the property of the Landlord or the
            Operator. Such device must be displayed as requested and may not be
            mutilated in any manner. The serial number of the parking
            identification device may not be obliterated. Parking passes and
            devices are not transferable except to agents, employees,
            representatives and invitees of Tenant and any pass or device in the
            possession of an unauthorized holder will be void.

     (viii) Monthly fees shall be payable in advance prior to the first day of
            each month. Failure to do so will automatically cancel parking
            privileges and a charge at the
<PAGE>

            prevailing daily parking rate will be due. No deductions or
            allowances from the monthly rate will be made for days on which the
            Parking Facility is not used by Tenant or its designees.

     (ix)   Parking Facility managers or attendants are not authorized to make
            or allow any exceptions to these Rules.

     (x)    Every parker is required to park and lock his/her own car.

     (xi)   Loss or theft of parking pass, identification, key cards or other
            such devices must be reported to Landlord and to the Parking
            Facility manager immediately. Any parking devices reported lost or
            stolen found on any authorized car will be confiscated and the
            illegal holder will be subject to prosecution. Lost or stolen passes
            and devices found by Tenant or its employees must be reported to the
            office of the garage immediately.

     (xii)  Washing, waxing, cleaning or servicing of any vehicle by the
            customer and/or his agents is prohibited. Parking spaces may be used
            only for parking automobiles.

     (xiii) By signing this Parking Agreement, Tenant agrees to acquaint all
            persons to whom Tenant assigns a parking pass with these Rules.

6.   Landlord may elect to provide parking cards or keys to control access to
     the Parking Facility or surface parking areas, if any.  In such event,
     Landlord shall provide Tenant with one card or key for each parking
     privilege that Tenant is entitled to hereunder, provided that Landlord
     shall have the right to require Tenant or its employees to place a deposit
     on such access cards or keys and to pay a fee for any lost or damaged cards
     or keys.

7.   Landlord hereby reserves the right to enter into a management agreement or
     lease with an entity for the Parking Facility ("Operator").  In such event,
     Tenant upon request of Landlord, shall enter into a parking agreement with
     the Operator and pay the Operator the monthly charge established hereunder,
     and Landlord shall have no liability for claims arising through acts or
     omissions of the Operator unless caused by Landlord's negligence or willful
     misconduct.  It is understood and agreed that the identity of the Operator
     may change from time to time during the Term.  In connection therewith, any
     parking lease or agreement entered into between Tenant and an Operator
     shall be freely assignable by such Operator or any successors thereto.

8.   NO LIABILITY.  TENANT ACKNOWLEDGES AND AGREES THAT, TO THE FULLEST EXTENT
     PERMITTED BY LAW, LANDLORD SHALL NOT BE RESPONSIBLE FOR ANY LOSS OR DAMAGE
     TO TENANT OR TENANT'S PROPERTY (INCLUDING, WITHOUT LIMITATIONS, ANY LOSS OR
     DAMAGE TO TENANT'S AUTOMOBILE OR THE CONTENTS THEREOF DUE TO THEFT,
     VANDALISM OR ACCIDENT) ARISING FROM OR RELATED TO TENANT'S USE OF THE
     PARKING FACILITY OR EXERCISE OF ANY RIGHTS UNDER THIS PARKING AGREEMENT,
     WHETHER OR NOT SUCH LOSS OR DAMAGE RESULTS FROM LANDLORD'S ACTIVE
     NEGLIGENCE OR NEGLIGENT OMISSION.  THE LIMITATION ON LANDLORD'S LIABILITY
     UNDER THE PRECEDING SENTENCE SHALL NOT APPLY HOWEVER TO LOSS OR DAMAGE
     ARISING DIRECTLY FROM LANDLORD'S WILLFUL MISCONDUCT.

9.   Release of Liability.  Without limiting the provisions of Paragraph 8
     above, Tenant hereby voluntarily releases, discharges, waives and
     relinquishes any and all actions or causes of action for personal injury or
     property damage occurring to Tenant arising as a result of parking in the
     Parking Facility, or any activities incidental thereto, wherever or however
     the same may occur, and further agrees that Tenant will not prosecute any
     claim for personal injury or property damage against Landlord or any of its
     officers, agents, servants or employees for any said causes of action.  It
     is the intention of Tenant by this instrument, to exempt and relieve
     Landlord from liability for personal injury or property damage caused by
     negligence.

10.  The provisions of Article XXI of the Lease are hereby incorporated by
     reference as if fully recited.
<PAGE>

     Tenant acknowledges that Tenant has read the provisions of this Parking
Agreement, has been fully and completely advised of the potential dangers
incidental to parking in the Parking Facility and is fully aware of the legal
consequences of signing this instrument.

     IN WITNESS WHEREOF, Landlord and Tenant have executed this Exhibit as of
the day and year first above written.

                             LANDLORD:

                             EOP-150 CALIFORNIA STREET, L.L.C., a Delaware
                             limited liability company

                             By: EOP Operating Limited Partnership, a Delaware
                             limited partnership, its sole member

                             By: Equity Office Properties Trust, a Maryland real
                                 estate investment trust, its managing general
                                 partner

                                 By:    /s/ Peter H. Adams
                                    ---------------------------
                                 Name:  Peter H. Adams
                                      -------------------------
                                 Title: Senior Vice President
                                       ------------------------

                             TENANT:

                             TENFOLD CORPORATION, a Delaware corporation

                             By:    /s/ Robert P. Hughes
                                -----------------------------------------
                             Name:  Robert P. Hughes
                                  ---------------------------------------
                             Title: Chief Financial Officer
                                   --------------------------------------

                             By:    /s/ Gary D. Kennedy
                                -----------------------------------------
                             Name:  Gary D. Kennedy
                                  ---------------------------------------
                             Title: President and Chief Executive Officer
                                   --------------------------------------
<PAGE>

                                   EXHIBIT G

                            FORM OF LETTER OF CREDIT
                            ------------------------

                            ________________________
                        [Name of Financial Institution]

                                         Irrevocable Standby
                                         Letter of Credit
                                         No. ______________________
                                         Issuance Date:_____________
                                         Expiration Date:____________
                                         Applicant:__________________

Beneficiary
-----------

EOP-150 California Street, L.L.C., a Delaware limited liability company
Two North Riverside Plaza
Suite 2200
Chicago, Illinois  60606

Ladies/Gentlemen:

     We hereby establish our Irrevocable Standby Letter of Credit in your favor
for the account of the above referenced Applicant in the amount of  Three
Million and 00/100 U.S. Dollars ($3,000,000.00) available for payment at sight
by your draft drawn on us when accompanied by the following documents:

1.   An original copy  of this Irrevocable Standby Letter of Credit.

2.   Beneficiary's dated statement purportedly signed by one of its officers
     reading: "This draw in the amount of ______________________ U.S. Dollars
     ($____________) under your Irrevocable Standby Letter of Credit No.
     ____________________ represents funds due and owing to us as a result of
     the Applicant's failure to comply with one or more of the terms of that
     certain lease by and between ______________________, as landlord, and
     _____________, as tenant."

     It is a condition of this Irrevocable Standby Letter of Credit that it will
be considered automatically renewed for a one year period upon the expiration
date set forth above and upon each anniversary of such date, unless at least
sixty (60) days prior to such expiration date or applicable anniversary thereof,
we notify you in writing by certified mail, return receipt requested, that we
elect not to so renew this Irrevocable Standby Letter of Credit.  A copy of any
such notice shall also be sent to:  Equity Office Properties Trust, 2 North
Riverside Plaza, Suite 2200, Chicago, IL 60606, Attention:  Senior Vice
President-Treasurer.  In addition to the foregoing, we understand and agree that
you shall be entitled to draw upon this Irrevocable Standby Letter of Credit in
accordance with 1 and 2 above in the event that we elect not to renew this
Irrevocable Standby Letter of Credit and, in addition, you provide us with a
dated statement proportedly signed by one of Beneficiary's officers stating that
the Applicant has failed to provide you with an acceptable substitute
irrevocable standby letter of credit in accordance with the terms of the above
referenced lease.  We further acknowledge and agree that:  (a) upon receipt of
the documentation required herein, we will honor your draws against this
Irrevocable Standby Letter of Credit without inquiry into the accuracy of
Beneficiary's signed statement and regardless of whether Applicant disputes the
content of such statement; (b) this Irrevocable Standby Letter of Credit shall
permit partial draws and, in the event you elect to draw upon less than the full
stated amount hereof, the stated amount of this Irrevocable Standby Letter of
Credit shall be automatically reduced by the amount of such partial draw; and
(c) you shall be entitled to assign your interest in this Irrevocable Standby
Letter of Credit from time to time without our approval and without charge.  In
the event of an assignment, we reserve the right to require reasonable evidence
of such assignment as a condition to any draw hereunder.

     This Irrevocable Standby Letter of Credit is subject to the Uniform Customs
and Practice for Documentary Credits (1993 revision) ICC Publication No. 500.
<PAGE>

     We hereby engage with you to honor drafts and documents drawn under and in
compliance with the terms of this Irrevocable Standby Letter of Credit.

     All communications to us with respect to this Irrevocable Standby Letter of
Credit must be addressed to our office located at
______________________________________________ to the attention of
__________________________________.

                                    Very truly yours,

                                    ______________________

                                                 [name]
                                             ----------

                                                 [title
                                             ----------

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