Document:

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                                                                    EXHIBIT 10.6

                                 LEASE AGREEMENT

         THIS LEASE (this "Lease"), made this 10th day of March, 2000 between
SPOKANE TEACHERS CREDIT UNION ("Landlord"), and SPECTRUM INTEGRATED SERVICES,
INC., D/B/A SOFTWARE SPECTRUM, a Texas corporation ("Tenant").

         AS PARTIES HERETO, Landlord and Tenant agree as follows:

                  1.       LEASE DATE AND EXHIBITS

                           The terms used herein shall have the following
meanings unless otherwise specifically modified by provisions of this Lease.

                  1.1      BUILDING 1

                           "Building 1" shall mean office building number 1,
located at 1620 North Signal Drive, Liberty Lake, Washington, situated on the
real property ("property") more particularly described in EXHIBIT A, as outlined
on the site plan attached hereto as EXHIBIT B-1.

                  1.2      BUILDING 2

                           "Building 2" shall mean office building number 2,
located at 22721 East Mission, Liberty Lake, Washington, situated on the
Property, and outlined on the site plan attached hereto as EXHIBIT B-1.

                  1.3      BUILDINGS

                           "Buildings" shall mean Building 1 and Building 2,
together with the enclosed passageway that connects Buildings 1 and 2.

                  1.4      COMPLEX

                           "Complex" shall mean the Buildings, the Common Area
and the Parking Area.

                  1.5      CAFETERIA

                           "Cafeteria" shall mean the cafeteria servicing the
Buildings and located within Building 1, as outlined on the site plan attached
hereto as EXHIBIT B-1.

                  1.6      PREMISES

                           "Premises" shall mean approximately 71,160 rentable
square feet in Building 1 and 2, as outlined on the floor plan attached hereto
as EXHIBIT B-2.

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                  1.7      COMMON AREA

                           "Common Area" shall mean all areas of the Buildings
and Grounds designated by Landlord as common areas for the use generally of
Landlord and other tenants of the Buildings, including, but not limited to the
enclosed passageway between the Buildings, the Fitness Room and the Cafeteria
(but excluding Landlord's lobby area outlined on EXHIBIT B-1, which shall be for
Landlord's exclusive use.)

                  1.8      PARKING AREA

                           "Parking Area" shall mean the unreserved parking
spaces in the parking area adjacent to the Buildings, as such parking area is
outlined on the site plan attached hereto as EXHIBIT B-1.

                  1.9      TENANT'S PERCENTAGE OF THE COMPLEX

                           "Tenant's Percentage of the Complex" shall mean sixty
one and two-tenths percent (61.2%), calculated on the basis of a total 71,160
rentable square feet in the Premises and a total of 116,262 rentable square feet
in the Buildings at the time of the Commencement Date of this Lease. It is
understood and agreed by the parties that Tenant's Percentage of the Complex
shall be recomputed accordingly in the event the total rentable square feet
leased by Tenant increases or decreases, or in the event the total rentable
square feet in the Buildings increases or decreases.

                  1.10     COMMENCEMENT DATE AND EXPIRATION DATE

                           "Commencement Date" shall mean April 1, 2000. If
Tenant shall occupy the Premises prior to the Commencement Date first stated
herein, then the Commencement Date shall be the date of such occupancy.

                           "Expiration Date" shall mean March 31, 2005.

                  1.11     RENT

                           "Rent" shall mean Basic Rent and Additional Rent as
hereinafter defined:

                  1.11.1   BASIC RENT

                           "Basic Rent" shall mean:
<TABLE>
                              <S>                 <C>                           <C>
                              Month 1             April 1 - 30, 2000            $47,202.80/month NNN
                              Months 2 - 37       May 1, 2000 - Apr 30, 2003    $49,066.24/month NNN
                              Months 38 - 61      May 1, 2003 - Apr 30, 2005    $54,954.00/month NNN
</TABLE>

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             1.11.2        ADDITIONAL RENT

                           "Additional Rent" shall mean the Actual Costs
Allocable to the Premises (as hereinafter defined) for a Lease Year (as
hereinafter defined), payable in equal monthly installments based on the
Estimated Costs Allocable to the Premises (as hereinafter defined) and using the
following definitions:

                  (a) "Operating Costs" shall mean all reasonable expenses
normally or customarily paid or incurred by Landlord, and not otherwise
reimbursed by any Tenant, for maintaining, operating and repairing the Complex
and the personal property used in conjunction therewith, including, without
limitation, the costs of:

                  (i)     refuse collection;

                  (ii)    water, sewer and utilities services;

                  (iii)   emergency power backup;

                  (iv)    light replacement service and parts;

                  (v)     supplies;

                  (vi)    janitorial and cleaning services;

                  (vii)   window washing;

                  (viii)  landscape maintenance;

                  (ix)    maintenance of telephone switching and related
                          equipment;

                  (x)     services of independent contractors;

                  (xi)    premiums for insurance, including, without limitation,
                          policies of casualty and liability insurance of such
                          types and in such amounts as Landlord deems necessary
                          or desirable in the exercise of Landlord's reasonable
                          judgment and which Tenant is named an additional
                          insured under,

                  (xii)   licenses, permits and inspection fees; and

                  (xiii)  any other reasonable expense or charge, whether or not
                          hereinabove described, which in accordance with
                          generally accepted accounting principles would be
                          considered an expense normally incurred for
                          maintaining, operating or repairing the Complex.

                  Provided, however, that to the extent Tenant pays directly for
any such expenses with respect to the Premises (for example; electrical service
separately metered to the Premises or custodial services separately contracted
for the Premises), then, "Operating Costs" shall mean the Tenant's prorated
share of the cost of providing such goods or services to the Common Area only.

                  (b) "Real Property Taxes" shall mean taxes on real property
and personal property, including all Tenant improvements for which Landlord is
not otherwise entitled to reimbursement by any Tenant or other occupant, charges
and assessments levied with respect to the Property, the Buildings, any
improvements, fixtures and equipment used directly in the operation of the
Complex and located in the Buildings or on the Properly; and any taxes levied or
assessed in addition to or in lieu of, in whole or in part, such real property
or personal property taxes; and any tax on Landlord's gross receipts unless such
tax cannot be charged to Tenant pursuant to applicable law.

                  (c) "Lease Year" shall mean the 12 month period commencing on
April 1.

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                  (d) "Actual Costs" shall mean the actual expenses paid or
incurred by Landlord for Operating Costs and Real Property Taxes during any
Lease Year of the term hereof.

                  (e) "Actual Costs Allocable to the Premises" shall mean the
Actual Costs multiplied by Tenant's Percentage of the Complex.

                  (f) "Estimated Costs Allocable to the Premises" shall mean
Landlord's estimate of Actual Costs allocable to the Premises for the following
Lease Year as reasonably determined by Landlord.

                  1.12     PERMITTED USES

                           "Permitted Uses" shall mean use of the Premises by
Tenant only for general office purposes and for no other business or purpose
without the prior written consent of Landlord.

                  1.13     DEFAULT RATE

                           "Default Rate" shall mean a rate equal to four
percent (4%) per annum over the prime rate of Bank of America (or its
successors), as announced from time to time.

                  1.14     EXHIBITS

                           The following exhibits are made a part of this Lease:

                                   EXHIBIT A            Legal Description

                                   EXHIBIT B-1          Site Plan of Property

                                   EXHIBIT B-2          Floor Plan of Premises

         In the event of any inconsistency in the provisions of this Section and
more specific provisions set forth elsewhere in this Lease, the more specific
provision shall control.

         2.       PREMISES

                  Landlord does hereby lease the Premises to Tenant; and Tenant
does hereby lease the Premises from Landlord, in their "as is" condition, upon
the terms and conditions herein set forth.

                  The parties acknowledge that Landlord owns and will continue
to occupy Building 1 and that, accordingly, Landlord and Tenant will share the
use of the Cafeteria and the enclosed passageway between the Buildings. Landlord
will also have rights of access through the Premises, for ingress and egress to
and from the electrical room in Building 2 as more fully described in Section 16
below.

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         3.       TERM

                  The term of this Lease ("Lease Term") shall be a period
extending for 60 months commencing on the Commencement Date and expiring on the
Expiration Date, subject to Tenant's renewal options as set forth in Section 4.

         4.       OPTION TO RENEW

                  4.1      OPTION

                           Landlord grants Tenant the option to extend the Lease
Term:

                           4.1.1 for that portion of the Premises located in
Building 1 for one (1) renewal term of three (3) years commencing immediately
upon the Expiration Date (the "Building 1 Renewal Term"); and

                           4.1.2 for that portion of the Premises located in
Building 2 for one (1) renewal term of either three (3) or five (5) years, at
Tenant's sole option, commencing immediately upon the Expiration Date (the term
so elected by Tenant referred to as the "Building 2 Renewal Term" and, together
with the Building 1 Renewal Term, the "Renewal Term").

                           The option to renew is expressly conditioned on
Tenant's being, on the first day of the Renewal Term, in full and faithful
compliance in all material respects with each and every one of its obligations
contained in this Lease.

                  4.3      RENEWAL TERMS

                           During any applicable Renewal Term, each and every
provision of this Lease will remain unchanged and in full force and effect
except that: (i) the Basic Rent will be adjusted as of the first day of the
applicable Renewal Term to a rental rate to be negotiated in good faith by the
parties at such time; and (ii) the definition of the term "Premises" shall be
adjusted to mean only the portion of the Premises that are renewed by Tenant
under Section 4.2.

         5.       PAYMENT OF BASIC RENT

                  Commencing on the Commencement Date, Tenant shall pay Landlord
Basic Rent in lawful money of the United States in advance on or before the
first day of each month without offset or deduction at the offices of Landlord
at 1620 North Signal Drive, Liberty Lake, Washington 99019, or such other place
as may be designated by Landlord. Basic Rent for any period during the Lease
Term which is less than one month shall be a pro rata portion of the monthly
installment.

         6.       PAYMENT OF ADDITIONAL RENT

                  Commencing on the Commencement Date, Tenant shall pay Landlord
as Additional Rent 1/12 (8.33%) of the Estimated Costs Allocable to the Premises
in lawful money of the United States in advance on or

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before the first day of each month, without deduction or offset, at the address
specified in Section 5. Prior to the commencement of each Lease Year during the
Lease Term, Landlord shall furnish Tenant a written statement of the Estimated
Costs Allocable to the Premises for such Lease Year, together with the
calculation of the estimated monthly Additional Rent payable during such Lease
Year. If at any time or times during such Lease Year it appears to Landlord that
the Actual Costs Allocable to the Premises will vary from Landlord's estimate by
more than five percent (5%) on an annual basis, Landlord may, by written notice
to Tenant, revise Landlord's estimate for such Lease Year, and subsequent
Additional Rent payments by Tenant for such Lease Year shall be recalculated
based on Landlord's revised Estimated Costs Allocable to the Premises. Within
ninety (90) days after the close of each Lease Year during the Lease Term, or as
soon thereafter as practicable, but not later than one hundred twenty (120) days
after the close of such Lease Year, Landlord shall deliver to Tenant a written
statement setting forth the Actual Costs Allocable to the Premises during the
preceding Lease Year. If such costs for any Lease Year exceed Estimated Costs
Allocable to the Premises paid by Tenant to Landlord, Tenant shall pay the
amount of such excess to Landlord as Additional Rent within forty-five (45) days
after receipt of such statement by Tenant. If such statement shows such costs to
be less than the amount paid by Tenant to Landlord, then the amount of such
overpayment by Tenant shall be credited by Landlord to the next immediate Rent
payable by Tenant. Tenant shall have the right, at Tenant's sole expense, to
audit Landlord's books regarding Actual Costs, provided that (i) such right
shall not be exercised more than once each calendar year, and (ii) such right
must be exercised, if at all, by delivery of written notice to Landlord on or
before thirty (30) days after Landlord's delivery of the written statement
setting forth Actual Costs Allocable to the Premises during the preceding Lease
Year. If the audit reveals that Landlord's statement is determined to be in
error by more than five percent (5%), the amount of Additional Rent payable by
Tenant attributable to Actual Costs Allocable to the Premises shall be
recalculated based upon the results of any such audit.

                  If the Expiration Date is a day other than the last day of a
Lease Year, the amount of any adjustment between Actual Costs and Estimated
Costs Allocable to the Premises with respect to the Lease Year in which such
termination occurs shall be prorated on the basis of a 365-day year. Any amount
payable by Landlord to Tenant or by Tenant to Landlord with respect to such
adjustment shall be payable within forty-five (45) days after delivery by
Landlord to Tenant of the Statement of Actual Costs Allocable to the Premises
with respect to such Lease Year.

         7.       (intentionally omitted)

         8.       USES

                  The Premises shall be used only for Permitted Uses and for no
other purpose without the prior written consent of Landlord. No act shall be
done in or about the Premises that is unlawful or that will increase the
existing rate of insurance on the Buildings. Tenant shall not commit or allow to
be committed any waste upon the Premises, or any public or private nuisance or
other act or thing which disturbs the quiet enjoyment of Landlord of any other
Tenant in the Buildings. Tenant shall not, without the written consent of
Landlord, use any apparatus, machinery or device in or about the Premises which
will cause any substantial noise or vibration or any increases in the normal use
of electric power. If any of Tenant's office machines and equipment should
disturb the quiet enjoyment of Landlord or any other Tenant in the Buildings,
then Tenant shall provide adequate insulation, or take other action as may be
necessary to eliminate the disturbance. Tenant shall comply with all laws
relating to Tenant's use of the Premises and shall observe, and cause employees
and invitees to observe, such reasonable rules and regulations as may be adopted
and published by Landlord for the safety, care

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and cleanliness of the Premises or the Buildings, and for the preservation of
good order therein, including but not limited to any rules and regulations
and/or declaration of protective covenants attached to this Lease.
Notwithstanding the foregoing, no rules or regulations hereafter promulgated by
Landlord shall materially diminish Tenant's rights or increase Tenant's
obligations under this Lease.

          9.      SERVICES AND UTILITIES

                  9.1      GENERAL

                           Landlord shall maintain the Common Area in reasonably
good order and condition except for damage occasioned by the act or omission of
Tenant, the repair of which damage shall be paid for by Tenant.

                           Landlord shall furnish (or cause to be furnished) the
Premises with electricity for lighting and operation of normal power usage
office machines, water, heat and normal air conditioning service. If the
foregoing services are not separately metered to Tenant, the cost to providing
such service shall be reimbursed by Tenant to Landlord in the form of Additional
Rent pursuant to Section 6. Tenant shall, at Tenant's expense, provide for its
own trash disposal and janitorial services with respect to the Premises.

                           Landlord shall not be liable for any loss, injury or
damage to property caused by or resulting from any variation, interruption or
failure of such services to be provided by Landlord (including, but not limited
to, the emergency power backup system) due to any cause whatsoever, or from
failure to make any repairs or perform any maintenance. In the event of such
variation, interruption or failure, however, Landlord shall use reasonable
diligence to restore such service. No temporary interruption or failure of such
services incident to the making of repairs, alterations or improvements, or due
to accident or strike, or conditions or events beyond Landlord's reasonable
control shall be deemed an eviction of Tenant or relieve Tenant from any of
Tenant's obligations hereunder. Landlord will use reasonable efforts to notify
Tenant at least forty-eight (48) hours in advance of any scheduled or
anticipated interruption in any such services. Notwithstanding anything to the
contrary contained in this Section 9 or elsewhere in this Lease, if any such
slowdown, interruption or stoppage of any such services, or the Landlord's
inability to perform any covenant herein creates a condition which interferes
substantially with Tenant's normal use of the Premises as allowed under this
Lease, and as a consequence Tenant is compelled to discontinue or materially
curtail business in the Premises in whole or in part for a period of twenty (20)
consecutive days, then the Basic Rent and Additional Rent shall be
proportionately abated during the time of such discontinuance or curtailment of
business, but no such abatement shall continue beyond the time that the
slowdown, interruption, stoppage or inability to perform no longer persists,
regardless of any delay by Tenant in resuming operation of business after that
time. If any such slowdown, interruption; stoppage or inability to perform
continues for a period of forty-five (45) consecutive days and Tenant is
compelled (whether for prudent business reasons or otherwise) to discontinue
business in the Premises, Tenant shall have the right thereafter to terminate
this Lease upon notice to Landlord; however, such termination right shall not
continue beyond the time that the slowdown, interruption, stoppage or inability
to perform no longer persists.

                           Before installing any equipment (other than customary
and normal office equipment) or creating an occupant load in the Premises that
generates more than an average amount of heat for the approved use, Tenant shall
obtain the written permission of Landlord and Landlord may refuse to grant such
permission if the amount of heat generated would place an above average burden
on the air-conditioning system of the

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Buildings unless Tenant shall agree to pay at Landlord's election: (a) the costs
of Landlord for installation, operation and maintenance of supplementary
air-conditioning units as necessitated by such equipment, or (b) an amount
reasonably determined by Landlord to cover the additional burden on the existing
air-conditioning system generated by such Tenant equipment.

                           If Tenant uses any equipment in the Premises
requiring above average power usage as compared to other areas of the Complex,
Tenant shall in advance, on the first day of each month during the Lease Term,
pay Landlord as Additional Rent the reasonable amount estimated by Landlord as
the cost of furnishing electricity for the operation of such equipment provided,
however, that this provision shall not be applicable if electricity is
separately metered for the Premises. Basic Rent does not include any amount to
cover the cost of furnishing electricity for such purposes unless so stated
herein.

                           At Tenant's request, Landlord shall use its best
efforts to cause utilities furnished to Tenant to be separately metered, and
Tenant shall pay for the installation costs of and the conversion to any meters
required. To the extent meters cannot be installed, or the cost of such
installation is excessive, Tenant shall continue to pay for such utilities as
part of the Additional Rent

                  9.2      CAFETERIA

                           Tenant shall be entitled to nonexclusive use (in
common with Landlord) of the Cafeteria servicing the Building. Operating Costs
relating to the Cafeteria will not include subsidies paid by Landlord for any
food service operations, but will include all other costs and expenses with
respect to the Cafeteria. Tenant agrees to cause its employees, agents and
invitees to comply with all reasonable rules and regulations as may be adopted
and published by Landlord from time to time for the safety, care and cleanliness
of the Cafeteria and for the preservation of good order therein.

         10.      PARKING AND ACCESS

                  The Parking Area shall be used for vehicle parking only and
shall be used for no other purposes, except as required for trash disposal
(including exterior storage) without the prior written consent of Landlord. The
Parking Area shall be available to Tenant and its invitees on a first come,
first served basis, and Tenant shall ensure that all parking spaces designated
as "Visitor Parking" in the Parking Area are kept available for visitors of
Landlord and Tenant, also on a first come, first served basis. Tenant agrees
that Tenant will not park, nor will Tenant permit Tenant's employees, agents,
guests, invitees and/or licensees to park, on streets within the Property or in
any other spaces, lots or areas within the Property except as may be
specifically provided for in this Lease. The Parking Area contains approximately
661 spaces which are for the exclusive use of Landlord and Tenant. Landlord
reserves (per Section 1.8) for Landlord's employees and visitors 100 of such
spaces in lot B, which specifically includes the 7 spaces that are marked as
"Reserved" for Landlord's executive staff. Tenant shall have the nonexclusive
use of the remaining spaces.

                  Trucks or other vehicles may only temporarily park at bays
serving the Premises while loading and unloading, and shall not be stored in the
parking, maneuvering or loading areas. Tenant, Tenant's employees, agents,
guests, invitees and licensees shall use all due care and reasonable best
efforts not to interfere with Landlord's and other tenants' use of parking and
maneuvering areas.

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         11.      TAX ON RENT

                  If any governmental authority shall in any manner levy a tax
on rent payable under this Lease or rentals accruing from use of property, or
such tax in any form against Landlord measured by income derived from the
leasing or rental of the Complex, such tax shall be paid by Tenant either
directly or through Landlord; provided, however, that Tenant shall not be liable
to pay any federal or state income tax imposed on Landlord.

         12.      PERSONAL PROPERTY TAXES

                  Tenant shall pay prior to delinquency all personal property
taxes payable with respect to all property of Tenant located on the Premises and
shall promptly provide written proof of such payment upon request of Landlord.

         13.      IMPROVEMENTS

                  All standard or special Tenant improvements which are affixed
to the Premises, including but not limited to, any paid for by Landlord, shall
at all times be the property of Landlord. Notwithstanding anything in this Lease
to the contrary, however, Tenant improvements such as telephone and computer
equipment (except for lines and internal Building wiring) and modular walls and
partitions, whether or not affixed to the Premises, will remain the property of
Tenant. Upon the Expiration Date or sooner termination of the Lease Term, all
improvements and additions to the Premises made by Tenant shall become the
property of Landlord, except Tenant may remove Tenant's trade fixtures, office
supplies and movable office furniture and equipment not attached to Building 2
provided: (a) such removal is made prior to the Expiration Date or sooner
termination of the Lease Term, (b) no Event of Default (as defined in Section 24
of this Lease) exists at the time of such removal, and (c) Tenant immediately
repairs all damage caused by or resulting from such removal. All other property
in the Premises and any alterations or additions thereto (including, without
limitation, wall-to-wall carpeting, paneling, wall covering or lighting fixtures
and apparatus) and any other article affixed to the floor, wall or ceiling of
the Premises shall become the property of Landlord and shall remain upon and be
surrendered with the Premises, Tenant hereby waiving all rights to any payment
or compensation therefor. If, however, Landlord so requests in writing, Tenant
will, prior to the Expiration Date or sooner termination of the Lease Term,
remove such alterations, additions, fixtures, equipment and property placed or
installed by Tenant in the Premises as requested by Landlord, and will
immediately repair any damage caused by or resulting from such removal to the
condition of the Premises prevailing upon the Commencement Date, reasonable wear
and tear excepted.

                  If Tenant shall fail to remove any of Tenant's property of any
nature whatsoever from the Premises on the Expiration Date, sooner termination
of the Lease Term or when Landlord has the right of re-entry, Landlord may, at
Landlord's option, remove and store said property without liability for loss
thereof or damage thereto, such storage to be for the account and at the expense
of Tenant. If Tenant shall not pay the cost of storing any such property after
it has been stored for a period of thirty (30) days or more, Landlord may, at
Landlord's option, sell, or permit to be sold, any or all of such property at
public or private sale (and Landlord may become a purchaser at such sale), in
such manner and at such times and places as Landlord in Landlord's sole
discretion may deem proper, without notice to Tenant, and shall apply the
proceeds of such sale; first, to the cost and expenses of such sale, including
reasonable attorneys' fees actually incurred; second, to the payment of the
costs or charges for storing any such property; third, to the payment of any
other sums of money which may

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then be or thereafter become due Landlord from Tenant under any of the terms
hereof; and, fourth, the balance, if any, to Tenant.

         14.      ALTERATIONS AND CARE OF PREMISES

                  Tenant shall take good care of the Premises (and all telephone
lines, equipment, fixtures and mechanical systems therein) and shall promptly
make all necessary repairs and maintenance, except those to be made by Landlord
as provided herein, in order to keep the Premises in neat, clean and sanitary
condition. Tenant shall maintain all signs approved by Landlord in good, clean
and attractive condition.

                  Landlord will be responsible only for structural repairs and
maintenance of the roof, foundations, sub-floor and structural walls of the
Buildings. Landlord will be responsible for the replacement of the HVAC,
mechanical, electrical and life safety systems in the Complex (including the
Premises) if Landlord determines that said systems and equipment have reached
the end of their economic life. Nothing herein will limit Tenant's obligation to
pay its share of Operating Costs with respect to the maintenance and operation
of the HVAC, mechanical, electrical and life safety systems in the Complex.

                  Tenant shall, at the expiration or sooner termination of this
Lease, surrender and deliver the Premises to Landlord in as good condition and
in the same layout and configuration as when received by Tenant from Landlord or
as thereafter improved with Landlord's consent, reasonable wear and tear and
damage by fire or other insured casualty excepted.

                  Tenant shall not make any material alterations, additions or
improvements in or to the Premises, or add, disturb or change in any material
way any floor covering, all covering, window blinds, fixtures, plumbing or
wiring without first obtaining the written consent of Landlord, which consent
will not be unreasonably withheld or delayed. Tenant shall deliver to Landlord
full and complete plans and specifications prepared by a licensed architect for
any such material alteration, addition or improvement provided that Tenant shall
not be required to retain an architect in connection with the installation of
telephone, computer and security equipment contemplated hereby. In addition,
notwithstanding the above, Tenant shall have the right to make nonstructural
alterations which do not exceed Ten Thousand Dollars ($10,000) in any one
instance, and minor decorations to the Premises, without obtaining Landlord's
written consent, but Tenant shall deliver to Landlord copies of all plans and
drawings relating to any such nonstructural alterations.

                  Landlord shall have the right to approve the contractor to be
hired by Tenant to construct any structural alteration, and such contractor
shall be fully licensed and bonded and insured.

                  Landlord does not and will not make any covenant or warranty,
express or implied, that any such plans or specifications submitted by Tenant
are accurate, complete or in any way suited for their intended purpose. Further,
Tenant shall indemnify and hold Landlord harmless from any liability, claim or
suit, including attorneys' fees, arising from any injury, damage, cost or loss
sustained by persons or property as a result of any defect in design, material
or workmanship arising as a result of any Tenant improvements.

                  All such work so done by Tenant shall be done in accordance
with all laws, ordinances and rules and regulations of any federal, state,
county, municipal or other public authority and/or Board of Fire Underwriters.
Tenant expressly covenants and agrees that no liens of mechanics, materialmen,
laborers,

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architects, artisans, contractors, subcontractors or any other lien of any kind
whatsoever shall be created against or imposed upon the Premises, the Property
or the Complex, and that in the event any such claims or liens of any kind
whatsoever shall be asserted or filed by any persons, firms or corporations
performing labor or furnishing material in connection with such work, Tenant
shall pay off or cause the same to be discharged of record within ten (10) days
of notification thereof. All alterations, improvements or changes made by Tenant
to the Premises shall be the property of Landlord and shall remain upon and be
surrendered with the Premises upon the termination of this Lease.

                  Landlord shall have the right, but not the obligation, to
inspect any alterations during and at the conclusion of construction. If, in
Landlord's reasonable opinion, the same are not installed in accordance with
plans and specifications submitted to Landlord under the requirements of this
Section, then, in addition to any other remedy provided to Landlord under this
Lease, Landlord shall have the right to require Tenant to reconstruct the same
to conform to such plans and specifications and at Tenant's cost and expense.

                  Tenant acknowledges and agrees that a material condition to
the granting of approval of Landlord to any alterations and/or improvements
and/or repairs required under this Lease or desired by Tenant is that the
contractors who perform such work shall carry a comprehensive liability policy,
naming Landlord as an additional insured thereon, with a combined single limit
for personal or bodily injury of not less than One Million Dollars ($1,000,000)
at Tenant's expense. Landlord may require proof of such insurance coverage from
each contractor at the time of submission of Tenant's request for Landlord's
consent to commence work.

                  All damage or injury done to the Premises by Tenant or by any
persons who may be in or upon the Premises with the consent (express or implied)
of Tenant, including the cracking or breaking of glass of any windows or doors,
shall be paid for by Tenant and Tenant shall pay for all damage to the Buildings
and any appurtenances thereto caused by Tenant or Tenant's employees, agents,
guests, invitees and/or licensees. Tenant shall promptly notify Landlord of any
damage to the Premises requiring repair. Landlord shall, in the exercise of
prudent business practices, determine those repairs that are necessary to
maintain the Premises in good condition.

         15.      HAZARDOUS MATERIAL

                  15.1     DEFINITION OF "ENVIRONMENTAL LAWS"

                           The term "Environmental Laws" means any and all
state, federal and local statutes, regulations and ordinances relating to the
protection of human health and the environment including any regulations,
restrictions, or licenses promulgated or issued by the Liberty Lake Sewer
District or other municipal corporation.

                  15.2     DEFINITION OF "HAZARDOUS MATERIAL"

                           The term "Hazardous Material" means any hazardous or
toxic substance, material or waste, including, but not limited to, those
substances, materials and wastes listed in the United States Department of
Transportation Hazardous Materials Table (49 C.F.R. Section 172.101) or by the
United States Environmental Protection Agency as hazardous substances (40 C.F.R.
at. 302 and amendments thereto), or as defined as hazardous substances by RCW
70.105D.020 (7), including petroleum products and their derivatives,

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<PAGE>   12

and such other substances, materials and wastes as become regulated or subject
to cleanup authority under any Environmental Laws. Notwithstanding the
foregoing, the term "Hazardous Material" shall not include: (1) chemicals
routinely used in business office areas, or (2) janitorial supplies, cleaning
fluids, or chemicals necessary for the day-to-day operation or other maintenance
of the Premises if the disposition, handling, storage or quantity of the items
described in (1) and (2) herein are at all times in compliance with all
applicable legal requirements.

                  15.3     LIMITATION ON USES OF HAZARDOUS MATERIAL

                           Tenant shall:

                           (a) not cause or permit any Hazardous Material to be
brought upon, used, kept or stored on or about the Premises by Tenant or its
agents, contractors or subtenants without the prior written consent of Landlord;

                           (b) cause the Premises and all of Tenant's operations
conducted thereon to comply with all Environmental Laws and orders of any
governmental authorities having jurisdiction under any Environmental Laws; and

                           (c) obtain, keep in effect and comply with all
governmental permits and authorizations required by Environmental Laws with
respect to the Premises or Tenant's operations.

                  15.4     NOTICES

                           Tenant shall immediately notify Landlord in writing
if Tenant becomes aware of any of the following:

                           (a) Any violation of Environmental Laws regarding the
Premises or Tenant's operations;

                           (b) Any order, notice of violation, fine or penalty
or other similar action relating to Hazardous Material or Environmental laws and
to the Premises or Tenant's operations; or

                           (c) Any complaint or lawsuit filed or threatened to
be filed by any person or other entity, including, without limitation, any
governmental authority, relating to Hazardous Material or Environmental Laws and
to the Premises or Tenant's operations.

                  15.5     INDEMNIFICATION

                           Tenant agrees to defend (with counsel approved by
Landlord), fully indemnify, and hold entirely free and harmless Landlord from
and against all claims, judgments, damages, penalties, fines, costs, liabilities
or losses (including, without limitation, diminution in value of the Premises,
damages for the loss or restriction on the use of rentable or usable space or of
any amenity of the Premises, damages arising from any adverse impact on
marketing of space, sums paid in settlement of claims, attorneys' fees,
consultant fees and expert fees) that arise during or after the Lease Term and
that are imposed on, or paid by or asserted against

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<PAGE>   13

Landlord by reason or on account of, or in connection with, or arising out of
Tenant's use, generation, manufacture, refinement, transportation, treatment,
storage, handling, recycling or disposal of Hazardous Material, or any release
of Hazardous Material in connection with or as a result of Tenant's use or
activities, or of Tenant's agents, contractors or subtenants, or any violation
of any Environmental Law by Tenant or its agents, subcontractors or subtenants;
provided further, however, that Tenant acknowledges that Landlord has disclosed
to Tenant the presence of asbestos floor tiles currently covered by carpeting
within the Premises. In the event any Tenant improvements or other alterations
require Tenant to disturb the floor tiles, Tenant will comply with all
Environmental Laws in connection with the disturbance of such tiles, and will
take all actions necessary to prevent or minimize any damage or personal injury
that may be caused by the release of, or exposure to, such asbestos and shall
pay for the removal of said floor tiles by a licensed asbestos abatement
contractor.

                  15.6     SURVIVAL

                           The provisions of this Section 15 shall survive the
expiration or earlier termination of this Lease.

         16.      ACCESS

                  16.1     GENERALLY

                           Landlord and Landlord's employees and agents shall
not have any right to enter the Premises without having given Tenant at least
twenty-four (24) hours prior notice of such entry, but no such notice shall be
required in cases of emergency involving an imminent risk to persons or property
or in cases of access to the electrical rooms as provided in Section 16.3. When
reasonably necessary, Landlord may temporarily close entrances, doors,
corridors, or other facilities without liability to Tenant by reason of such
closure and without such action by Landlord being construed as an eviction of
Tenant or as relieving Tenant from the duty of observing and performing any of
the provisions of this Lease; provided that Landlord, whenever reasonably
practical, shall give Tenant notice of any such closure. Landlord shall have the
right to enter the Premises for the purpose of showing the Premises to
prospective tenants within one hundred twenty (120) days prior to the Expiration
Date or sooner termination of the Lease Term. Landlord shall not be liable for
the consequences of admitting by passkey, or refusing to admit to the Premises,
Tenant or Tenant's employees, agents, guests, invitees and/or licensees.

                           Landlord shall indemnify and hold Tenant harmless
from and against all loss, cost, expense, claim or damage arising from any
negligent act or omission of any employee, agent or invitee of Landlord while in
the Premises.

                  16.2     EXERCISE FACILITIES AND UTILITIES AND TELEPHONE
                           EQUIPMENT ROOMS

                           Landlord has retained exclusive use of, and does not
lease to Tenant, the water heater room adjacent to the exercise facilities, both
located in Building 2, as outlined on the site plan attached hereto as EXHIBIT
B-2. Landlord will have access through the Premises on an as-needed basis only
to the telephone equipment room, the water heater room and the utility room
adjacent to the water heater room. Landlord's access to such rooms will be
limited to Landlord's technical, maintenance and security personnel. Landlord's
access to the utility room will be for the purpose of reading meters, performing
required maintenance, and

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<PAGE>   14

observing the security panel located therein. During the period of shared access
to the telephone equipment room, if either Landlord or Tenant determines that
any repairs, modifications or alterations are necessary in the telephone
equipment room, the party making such determination may make such repairs,
modifications or alterations only after receiving the written approval of the
other party, which party shall not unreasonably withhold or delay such approval.
Landlord agrees to use commercially reasonable best efforts to comply with all
reasonable requests of Tenant to assist Tenant in Tenant's installation of its
Telephone Switching Equipment and systems in the Premises. Landlord and
Landlord's employees and agents shall not have access to the exercise facilities
through the Premises.

                           Tenant and its employees will have the right to
access to and use of the exercise room. Landlord shall be responsible for the
maintenance of the exercise equipment and such maintenance costs shall be
included in the Operating Costs referenced in Section 1.11.2 above.

                  16.3     ELECTRICAL ROOM

                           Landlord has retained use of, and does not lease to
Tenant, the electrical room located in Building 2, as outlined on the site plan
attached hereto as EXHIBIT B-2. Landlord agrees to use commercially reasonable
best efforts to comply with all reasonable requests of Tenant to assist Tenant
in Tenant's installation of its wiring and connections for computer and
electrical equipment required by Tenant for the operation of its business in the
Premises. Landlord will share use of the electrical room with Tenant. The costs
and expenses that are paid or incurred by Landlord for maintaining, operating
and repairing the electrical room will be included within Operating Costs to be
shared by Tenant under this Lease. In addition, each party shall defend and
indemnify the other party and save the other party harmless from and against any
and all liability, damages, costs or expenses, including reasonable attorneys'
fees, arising from any act, omission or negligence of the indemnifying party or
its employees or agents arising from such party's use of or access to the
electrical room. Tenant shall permit Landlord and Landlord's employees and
agents to enter into, upon and through the Premises, at all times required by
Landlord, for ingress and egress to and from the electrical room. Landlord's
access through the Premises to the electrical room will be limited to Landlord's
technical, maintenance and security personnel. Such access shall be on an
as-needed basis only.

         17.      INSURANCE

                  17.1     FIRE AND EXTENDED COVERAGE INSURANCE ON TENANT'S
                           PERSONAL PROPERTY AND FIXTURES

                           At all times during the Lease Term, Tenant shall keep
in force at Tenant's sole cost and expense All Direct Cause of Loss coverage in
companies reasonably acceptable to Landlord, equal to the full replacement cost
of Tenant's fixtures, furnishings, equipment and contents upon the Premises.
Landlord shall be named as an additional insured on all such policies.

                           At all times during the Lease Term, Landlord shall
keep in force All Direct Cause of Loss coverage in an amount equal to the full
replacement cost of the Complex in amounts and with companies acceptable to
Landlord in the exercise of prudent business practices. Tenant acknowledges that
it will pay its proportionate share of such insurance pursuant to Sections
1.11.2 and 6 and Tenant will be named an additional insured on such policies.

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<PAGE>   15

                  17.2     LIABILITY INSURANCE

                           Tenant shall, during the Lease Term, keep in full
force and effect a policy of public liability and property damage insurance with
respect to the Premises and the business operated by Tenant in the Premises,
with a combined single limit for personal or bodily injury and property damage
of not less than One Million Dollars ($1,000,000). The policy shall name Tenant
as insured, and Landlord as an additional insured and shall contain a clause
that the insurer will not cancel or change the insurance without first giving
Landlord thirty (30) days' written notice. The insurance shall be provided by an
insurance company approved by Landlord and a copy of the policy or a certificate
of insurance shall be delivered to Landlord. All public liability, property
damage and other liability policies shall be written as primary policies, not
contributing with and not in excess of coverage which Landlord may carry. All
such policies shall contain a provision that Landlord, although named as an
additional insured, shall nevertheless be entitled to recover under said
policies for any loss occasioned to Landlord, Landlord's employees and/or agents
by reason of the negligence of Tenant. All such insurance shall specifically
insure the performance by Tenant of the indemnity agreement as to liability for
injury to or death of persons or injury or damage to property as contained in
Section 20. Any insurance (whether liability or casualty) required by the terms
of this Lease to be carried by Tenant may be carried under a blanket policy (or
policies) covering other properties of Tenant or its related or affiliated
corporations, or both; provided, however, that Tenant provide Landlord evidence
reasonably satisfactory to Landlord that (a) Landlord is named as an additional
insured on such policy or policies and (b) the coverage under such policy or
policies is sufficient to cover the limits required herein.

                  17.3     LANDLORD'S LIABILITY INSURANCE

                           At all times during the term of this Lease, Landlord
shall maintain in full force and effect comprehensive public liability insurance
with minimum limits of One Million Dollars ($1,000,000) for injury to or death
of one or more persons in any one occurrence and One Million Dollars
($1,000,000) for damage to or destruction of property in any one occurrence. Any
insurance (whether liability or casualty) required by the terms of this Lease to
be carried by Landlord may be under a blanket policy (or policies) covering
other properties of Landlord and/or its related or affiliated entities.

                  17.4     LENDER

                           Any mortgage lender interested in any part of the
Buildings or Premises may, at Landlord's option, be afforded coverage under any
policy required to be secured by Tenant hereunder, by use of a mortgagee's
endorsement to the policy or policies.

         18.      DAMAGE OR DESTRUCTION

                  If the Premises or all or part of the Complex shall be
destroyed or rendered untenantable, either wholly or in part, by fire or other
unavoidable casualty such that Tenant cannot reasonably continue to carry out
its normal business activities from the Premises until such damage is repaired,
which repairs Landlord's Architect reasonably believes can be repaired within
one hundred eighty (180) days from the casualty, and provided such repairs do
not actually require more than two hundred ten (210) days from the date of the
casualty to be completed, then this Lease shall not terminate. Otherwise, either
party may, by written notice to the other, either (a) terminate this Lease
within sixty (60) days after (i) such casualty or (ii) the end of such two
hundred

                                       15
<PAGE>   16

ten (210) day period, as applicable, or (b) keep this Lease in effect, in which
case Landlord shall restore the Premises to their previous condition; provided
during such restoration Basic Rent and Additional Rent shall be abated in the
same proportion as the untenantable portion of the Premises bears to the whole
thereof; and provided further if the damage is due directly or indirectly to the
fault or neglect of Tenant or Tenant's employees, agents, guests, invitees
and/or licensees, there shall be no abatement of Rent. Landlord shall not be
required to repair or restore fixtures, improvements or other property of
Tenant.

         19.      WAIVER OF SUBROGATION

                  Whether the loss or damage is due to the negligence of either
Landlord of Tenant, their employees or agents, or any other cause, Landlord and
Tenant do each herewith and hereby release and relieve the other and any other
Tenant, its employees and agents from responsibility for, and waive their entire
claim of recovery (including deductible amounts under the policies of insurance
referred to below) for, any loss or damage to the real or personal property of
either located anywhere in the Buildings arising out of or incident to the
occurrence of any of the perils which are covered and paid by their respective
insurance policies, with extended coverage endorsements, that each of them is
required to carry under this Lease (regardless of whether such coverage is
actually in effect). Each party shall cause its insurance carriers to consent to
such waiver and to waive all rights of subrogation against the other party.

         20.      INDEMNIFICATION

                  Subject to Section 19, Tenant shall defend and indemnify
Landlord and save Landlord harmless from and against any and all liability,
damages, costs or expenses, including attorneys' fees, arising from any act,
omission or negligence of Tenant or Tenant's employees, agents, guests, invitees
and/or licensees in or about the Premises, the Common Area and the Parking Area,
or arising from any breach or default under this Lease by Tenant, or arising
from any accident, injury or damage, howsoever and by whomsoever caused, to any
person or property, occurring in or about the Premises, the Common Area and the
Parking Area, provided that the foregoing provision shall not be construed to
make Tenant responsible for loss, damage, liability or expense resulting from
injuries to third parties caused by the negligence of Landlord or Landlord's
employees, agents and/or invitees.

                  Landlord shall not be liable for any loss or damage to person
or property sustained by Tenant or other persons, which may be caused by the
buildings or the Premises, or any appurtenances thereto, being out of repair, or
the bursting or leakage of any water, gas, sewer or steam pipe, or by theft, or
by any food born or contagious illness; or by any act, omission or neglect of
any Tenant or occupant, including the Cafeteria and its employees and agents, or
other person, or by any other cause of whatsoever nature except to the extent
that Tenant's loss is caused by the gross negligence, willful misconduct or
willful omission of Landlord or Landlord's employees or agents. Tenant agrees to
use and occupy the Premises, the Common Area and the Parking Area at Tenant's
own risk and, except as specifically set forth in the preceding sentence, hereby
releases Landlord, Landlord's employees and/or agents from all claims for any
damage or injury to the fullest extent permitted by law.

                                       16
<PAGE>   17

         21.      ASSIGNMENT AND SUBLETTING

                  Subject to the terms set forth herein, Tenant shall not
assign, transfer, mortgage or encumber this Lease nor sublet the whole or any
part of the Premises without first obtaining Landlord's written consent, which
consent may be withheld or conditioned in Landlord's sole reasonable discretion.
Any consent granted by Landlord shall require that such subtenant or assignee
consent to be bound by all of the terms and conditions of this Lease. No such
assignment or subletting shall relieve Tenant of any liability under this Lease
regardless of whether such liability arises by or through Tenant. Assignment or
subletting shall not operate as a waiver of the necessity for a written consent
to any subsequent assignment or subletting, and the terms of such consent shall
be binding upon any person holding by, under or through Tenant. Landlord may, at
Landlord's election, collect rent directly from such assignee or subtenant.

                  If Tenant is a corporation, then any transfer of this Lease by
operation of law, merger, consolidation or liquidation shall constitute an
assignment for the purpose of this Section; provided, however, that as long as
Tenant is a publicly owned company, Landlord's consent to an assignment of this
Lease will not be required as a result of merger, consolidation or liquidation,
or any change in the ownership of, or power to vote, the majority or controlling
interest of Tenant's outstanding voting stock unless (a) such change is the
result of any reorganization or merger by which the Tenant's rights under this
Lease are transferred to a subsidiary or affiliate or any other entity in which
Tenant has controlling interest (in which case Tenant agrees to guaranty
performance under this Lease and upon receipt of such guaranty, in form and
content satisfactory to Landlord, Landlord's consent will automatically be
deemed to be given) or (b) such change results from Tenant's merger with, or
purchase by, any competitor of Landlord.

                  In the event Tenant should desire to assign this Lease or
sublet the Premises or any part hereof, Tenant shall give Landlord written
notice at least thirty (30) days in advance of the date on which Tenant desires
to make such assignment or sublease, which notice shall specify: (a) the name
and business of the proposed assignee or sublessee, (b) the amount and location
of the space affected, (c) the proposed effective date and duration of the
subletting or assignment, and (d) the proposed rental to be paid to Tenant by
such sublessee or assignee. Landlord shall then have a period of fifteen (15)
days following receipt of such notice within which to notify Tenant in writing
that Landlord elects either (i) to permit Tenant to assign or sublet such space,
in which event if the proposed rental rate between Tenant and sublessee is
greater than the Rent payable under this Lease, then such excess rental shall be
deemed Additional Rent owed by Tenant to Landlord under this lease, and the
amount of such excess, including any subsequent increases due to escalation or
otherwise, shall be paid by Tenant to Landlord in the same manner than Tenant
pays the Rent hereunder and in addition thereto, or (ii) to withhold consent to
Tenant's assignment or subleasing such space and to continue this Lease in full
force and effort as to the entire Premises.

         22.      SIGNS

                  Tenant shall not inscribe any inscription, or post, place or
in any manner display any sign, notice, picture, placard or poster or any
advertising matter whatsoever, anywhere in or about the Premises or the
Buildings at places visible (either directly or indirectly as an outline or
shadow on a glass pane) from anywhere outside the Premises without first
obtaining Landlord's written consent thereto which consent shall not be
unreasonably withheld or delayed. Tenant shall have the right to place signage
on the north wall of Building 1 below the Landlord's signage and subject to
Landlord's approval as set forth in this section. It is understood and

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<PAGE>   18

agreed that Landlord's signage may be more prominent than Tenant's signage
Tenant shall deliver to Landlord drawings or plans showing any such sign prior
to its installation. Any such consent by Landlord shall be upon the
understanding and condition that Tenant will remove the same at the Expiration
Date or sooner termination of the Lease Term and Tenant shall repair any damage
to the Premises or the Building caused thereby.

         23.      LIENS AND INSOLVENCY

                  Tenant shall keep the Premises and the Complex free from any
liens arising out of any work performed and materials ordered or obligations
incurred by Tenant, and Tenant does hereby indemnify and hold Landlord harmless
from any liability arising from such lien. In the event any lien is filed
against the Complex, the Property described on EXHIBIT A or the Premises by any
person claiming by, through or under Tenant, Tenant shall promptly, upon request
of Landlord and at Tenant's sole costs and expense, furnish to Landlord a bond
in form, content and amount, and issued by a surety, satisfactory to Landlord,
in its sole discretion, indemnifying Landlord, the Property and the Complex
against any liability, costs and expenses, including, without limitation,
attorneys' fees, which Landlord may incur as a result thereof. Provided such
bond has been furnished, and after written notice to Landlord, Tenant may
contest any such lien by appropriate proceedings conducted in good faith and
with due diligence, at Tenant's sole cost and expense, if and only if such
proceedings suspend the collection of any amount claimed from Landlord, Tenant,
the Property and the Premises, and neither the Property, the Complex nor the
Premises (or any part thereof) is or will be in danger of being sold, forfeited
or lost.

         24.      DEFAULTS

                  24.1     EVENTS OF DEFAULT

                           The following events are referred to, collectively,
as "Events of Default" or, individually, as an "Event of Default":

         (a) Tenant defaults in the due and punctual payment of Rent, and such
default continues for five (5) days after written notice from Landlord delivered
by hand to Tenant's last known address or via facsimile to Tenant's last known
facsimile number, however, Tenant will not be entitled to more than one (1)
written notice for monetary defaults during any twelve (12) month period, and if
after such written notice any Rent is not paid within five (5) days of when due,
an Event of Default will be considered to have occurred without further notice:

         (b) This Lease or the Premises or any part of the Premises are taken
upon execution or by other process of law directed against Tenant, or are taken
upon or subject to any attachment by any creditor of Tenant or claimant against
Tenant, and the attachment is not discharged or disposed of within thirty (30)
days after its levy.

         (c) Tenant is insolvent or files a petition in bankruptcy or insolvency
or for reorganization or arrangement under the bankruptcy laws of the United
States or under any solvency act of any state, or admits the material
allegations of any such petition by answer or otherwise, or is dissolved or
makes an assignment for the benefit of creditors;

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<PAGE>   19

         (d) Involuntary proceedings under any such bankruptcy law or insolvency
act or for the dissolution of Tenant are instituted against Tenant, or a
receiver or trustee is appointed for all or substantially all of the property of
Tenant, and such proceeding is not dismissed or such receivership or trusteeship
vacated within sixty (60) days after such institution or appointment; or

         (e) Tenant breaches any of the other agreements, terms, covenants or
conditions that this Lease requires Tenant to perform, and such breach continues
for a period of thirty (30) days after written notice from Landlord to Tenant
or, if such breach cannot be cured reasonably within such thirty (30) day
period, if Tenant fails to diligently commence to cure such breach within thirty
(30) days after written notice from Landlord and to complete such cure within a
reasonable time thereafter.

Notice as required herein shall be delivered in compliance with provisions of
Section 30.

                  24.2     LANDLORD'S REMEDIES

                           If any one or more Events of Default set forth in
Section 24.1 occur, then Landlord has the right, at its election:

         (a) To give Tenant written notice by hand delivery to Tenant's last
known address or via facsimile to Tenant's last known facsimile number of
Landlord's intention to terminate this Lease on the earliest date permitted by
law or on any later date specified in such notice, in which case Tenant's right
to possession of the Premises will cease and this Lease will be terminated,
except as to Tenant's liability, as if the expiration of the term fixed in such
notice were the end of the term;

         (b) Without further demand or notice, to reenter and take possession of
the Premises or any part of the Premises, repossess the same, expel Tenant and
those claiming through or under Tenant, and remove the effects of both or
either, using such force for such purposes as may be necessary, without being
liable for prosecution, without being deemed guilty of any manner of trespass
and without prejudice to any remedies for arrears of monthly rent or other
amounts payable under this Lease or as a result of any preceding breach of
covenants or conditions; or

         (c) Without further demand or notice to cure any Event of Default and
to charge Tenant for the cost of effecting such cure, including, without
limitation, reasonable attorneys' fees and interest on the amount so advanced at
the rate of ten percent (10%) per annum, provided that Landlord will have no
obligation to cure any such Event of Default of Tenant.

         Should Landlord elect to reenter as provided in (b), or should Landlord
take possession pursuant to legal proceedings or pursuant to any notice provided
by law, Landlord may, from time to time, without terminating this Lease, relet
the Premises or any part of the Premises in Landlord's or Tenant's name, but for
the account of Tenant, for such term or terms (which may be greater or less than
the period that would otherwise have constituted the balance of the term) and on
such conditions and upon such other terms (which may include concessions of free
rent and alteration and repair of the Premises) as Landlord, in its reasonable
discretion, may determine, and Landlord may collect and receive the Rent.
Landlord will in no way be responsible or liable for any failure to relet the
Premises, or any part of the Premises, or for any failure to collect any Rent
due upon such reletting. No such reentry or taking possession of the Premises by
Landlord will be construed as an election on

                                       19
<PAGE>   20

Landlord's part to terminate this Lease unless a written notice of such
intention is given to Tenant. No written notice from Landlord under this Section
24.2 or under a forcible or unlawful entry and detainer statute or similar law
will constitute an election by Landlord to terminate this Lease unless such
notice specifically so states. Landlord reserves the right following any such
reentry or reletting to exercise its right to terminate this Lease by giving
Tenant such written notice, in which event this Lease will terminate as
specified in such notice.

                  24.3     CERTAIN DAMAGES

                           In the event that Landlord does not elect to
terminate this Lease as permitted in Section 24.1(a), but on the contrary elects
to take possession as provided in Section 24.2(b), Tenant shall pay to Landlord
monthly Rent and other sums as provided in this Lease that would be payable
under this Lease if such repossession had not occurred, less the net proceeds,
if any, of any reletting of the Premises after deducting all of Landlord's
reasonable expenses in connection with such reletting, including, without
limitation, all repossession costs, brokerage commissions, attorneys' fees,
expenses of employees, alteration and repair costs and expenses of preparation
for such reletting. If, in connection with any reletting, the new lease terms
extends beyond the existing term, or the Premises covered by such new lease
include other premises not part of the Premises, a fair apportionment of the
rent received from such reletting and the expenses incurred in connection with
such reletting as provided in this Section 24.3 will be made in determining the
net proceeds from such reletting, and any rent concessions will be equally
apportioned over the term of the new lease. Tenant shall pay such rent and other
sums to Landlord monthly on the day on which the monthly Rent would have bean
payable under this Lease if possession had not been retaken, and the Landlord
will be entitled to receive such rent and other sums from Tenant on each such
day. Landlord will attempt to mitigate damages arising from an Event of Default
by making reasonable efforts to relet the Premises in whole or in part.

                  24.4     CONTINUING LIABILITY AFTER TERMINATION

                           If this Lease is terminated on account of the
occurrence of an Event of Default, Tenant will remain liable to Landlord for
damages in an amount equal to monthly Rent and other amounts that would have
been owing by Tenant for the balance of the term had this Lease not been
terminated, less the net proceeds, if any, of any reletting of the Premises by
Landlord subsequent to such termination, after deducting all of Landlord's
expenses in connection with such reletting, including, without limitation, the
expenses enumerated in Section 24.3. Landlord will be entitled to collect such
damages from Tenant monthly on the day on which monthly Rent and other amounts
would have been payable under this Lease if this Lease had not been terminated,
and Landlord will be entitled to receive such monthly Rent and other amounts
from Tenant on each such day. Alternatively, at the option of Landlord, in the
event this Lease is so terminated, Landlord will be entitled to recover against
Tenant as damages for loss of the bargain and not as penalty.

         (a) The worth at the time of award of the unpaid Rent that had been
earned at the time of termination;

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

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<PAGE>   21

         (c) The worth at the time of award of the amount by which the unpaid
Rent for the balance of the term of this Lease (had the same not been so
terminated by Landlord) after the time of award exceeds the amount of such
rental loss that Tenant proves could be reasonably avoided; and

         (d) Any other amount necessary to compensate Landlord for all the
detriment proximately caused by Tenant's failure to perform its obligations
under this Lease or, in the ordinary course of business, likely to result
therefrom.

         The "Worth at the time of award" of the amounts referred to in (a) and
(b) above is computed by adding interest at the interest rate of ten percent
(l0%) per annum on the termination date from the termination date until the time
of the award. The "worth at the time of award" of the amount referred to in (c)
above is computed by discounting such amount at the discount rate of the Federal
Reserve Bank of Seattle, Washington, at the time of award plus one percent (1%).

                  24.5     CUMULATIVE REMEDIES

                           Any suit or suits for the recovery of the amounts and
damages set forth in Sections 24.3 and 24.4 may be brought by Landlord, from
time to time, at Landlord's election, and nothing in this Lease will be deemed
to require Landlord to await the date upon which this Lease or the term would
have expired had there occurred no Event of Default. Each right and remedy
provided for in this Lease is cumulative and is in addition to every other right
or remedy provided for in this Lease or now or hereafter existing at law or in
equity or by statute or otherwise, and the exercise or beginning of the exercise
by Landlord of any one or more of the right or remedies provided for in this
Lease or now or hereafter existing at law or in equity or by statute or
otherwise will be preclude the simultaneous or later exercise by Landlord of any
or all other rights or remedies provided for in this Lease or now or hereafter
existing at law or in equity or by statute or otherwise. All costs incurred by
Landlord in collecting any amounts and damages owing by Tenant pursuant to the
provisions of this Lease or to enforce any provision of this Lease, including
reasonable attorneys' fees from the date any such matter is turned over to an
attorney, whether or not one or more actions are commenced by Landlord, will
also be recoverable by Landlord from Tenant.

         25.      PRIORITY

                  This Lease will be subordinate to any mortgage or deed of
trust now existing upon the Premises or the Property and to any and all advances
to be made thereunder, and to interest thereon, and all renewals, replacements
or extensions thereof. Tenant agrees to subordinate its interest in the Premises
and under this Lease to the lien of a future mortgage or deed of trust which
secures a loan to Landlord for the benefit of the Complex or Premises (or a loan
to refinance such a loan), and further agrees to attorn to the holder of such
mortgage or such deed of trust, provided that the holder of such mortgage or
deed of trust delivers to Tenant a non-disturbance and providing that so long as
Tenant is not in default under this Lease, Tenant's possession of the Premises
and rights under this Lease shall not be effected by a foreclosure, a deed in
lieu of foreclosure or any other post-default remedy or proceeding under such
mortgage or deed of trust.

                                       21
<PAGE>   22

         26.      NONWAIVER

                  Waiver by Landlord of any breach of any term, covenant or
condition herein contained shall not be deemed to be a waiver of such term,
covenant or condition, or of any subsequent breach of the same or any other
term, covenant or condition herein contained. The subsequent acceptance of Rent
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.

         27.      SURRENDER OF POSSESSION

                  Upon the Expiration Date or sooner termination of the Lease
Term, whether by lapse of time or otherwise, Tenant shall promptly and
peacefully surrender the Premises to Landlord.

         28.      HOLDOVER

                  If Tenant shall, with the written consent of Landlord, hold
over after the Expiration Date of the Lease Term, Tenant shall be deemed to be
occupying the Premises on a month-to-month tenancy, which tenancy may be
terminated as provided by the laws of the State of Washington. During such
tenancy, Tenant agrees to pay to Landlord twice the Basic Rent as set forth
herein, plus Additional Rent unless a different rate shall be agreed upon, and
to be bound by all of the terms, covenants and conditions herein specified, so
far as applicable.

         29.      CONDEMNATION

                  If all of the Premises, or such portions of Building 1 or
Building 2 as may be required for the reasonable use of the Premises, are taken
by eminent domain, this Lease shall automatically terminate as of the date
Tenant is required to vacate the Premises and all Rent shall be paid to that
date. In case of a taking of a part of the Premises, or a portion of Building 1
or Building 2 not required for the reasonable use of the Premises, then this
Lease shall continue in full force and effect and the Rent shall be equitably
reduced based on the proportion by which Tenant's Percentage of the Complex is
reduced, such Rent reduction to be effective as of the date possession of such
portion is delivered to the condemning authority. Landlord reserves all rights
to damage to the Premises for any taking by eminent domain, and Tenant hereby
assigns to Landlord any right Tenant may have to such damages or award, and
Tenant shall make no claim against Landlord for damages for termination of the
leasehold interest or interference with Tenant's business. Tenant shall have the
right, however, to claim and recover from the condemning authority compensation
for any loss to which Tenant may be put for Tenant's moving expenses, provided
that such damages may be claimed only if they are awarded separately in the
eminent domain proceedings and not as part of the damages recoverable by
Landlord.

         30.      NOTICES

                  Any notices, consents, approvals, elections, submissions,
requests or demands required or permitted to be given under this Lease or
pursuant to any law or governmental regulation by Landlord to Tenant or by
Tenant to Landlord shall be in writing (whether or not expressly so provided)
and shall be deemed received and effective five (5) days after being deposited
in the United States mail, registered or certified mail, return receipt
requested, postage prepaid or one (1) business day after being sent by overnight
express mail or nationally recognized courier service (e.g. Federal Express) to
Landlord or Tenant, at the respective addresses set forth below or such other
addresses as either party may designate by notice to the other from time to
time. In

                                       22
<PAGE>   23

lieu of registered or certified mail, and in any event during any period of
postal strike or other interference with the mails, any notice may be given by
personal delivery with a receipt signed by the person served or by any person
authorized by law to serve process in the jurisdiction where such service is
accomplished and shall be effective when received. The address for notices to
Landlord shall be Spokane Teachers Credit Union, 1620 N. Signal Dr., Liberty
Lake, Washington 99019. The address for notices to Tenant shall be: Spectrum
Integrated Services, Inc. d/b/a Software Spectrum,. Attn.: Facilities Director
at 2140 Merritt Dr., Garland, Texas, 75041 and copy to General Counsel at the
same address.

         31.      COSTS AND ATTORNEYS' FEES

                  If Tenant or Landlord shall take any action for any relief
against the other, declaratory or otherwise, arising out of this Lease,
including any suit by Landlord for the recovery or rent or possession of the
Premises, the losing party shall pay the successful party a reasonable sum for
attorneys' fees and costs in such action, at trial and on appeal, and such
attorneys' fees and costs shall be deemed to have accrued on the commencement of
such action.

                  In the event Tenant requests Landlord's consent to any
assignment or sublease hereunder or to any modification or amendment of this
Lease, then Tenant shall pay reasonable attorneys' fees incurred by Landlord in
connection with Landlord's review of such request and preparation of any
documents required to evidence Landlord's consent, if granted.

         32.      LANDLORD'S LIABILITY

                  Anything in this Lease to the contrary notwithstanding,
covenants, undertakings and agreements herein made on the part of Landlord are
made and intended not as personal covenants, undertakings and agreements or for
the purpose of binding Landlord personally or the assets of Landlord except
Landlord's interest in the Premises and the Complex, but are made and intended
for the purpose of binding only Landlord's interest in the Premises and Complex,
including, but not limited to, any and all net consideration received by
Landlord from the sale of all or any portion thereof, and all net insurance and
condemnation proceeds paid to Landlord in connection therewith. No personal
liability or personal responsibility is assumed by, or shall at any time be
asserted or enforceable against, Landlord or Landlord's heirs, legal
representatives, successors or assigns on account of this Lease or on account of
any covenant, undertaking or agreement of Landlord contained in this Lease.

         33.      ESTOPPEL CERTIFICATES

                  Tenant shall, from time to time upon written request of
Landlord, execute, acknowledge and deliver to Landlord or Landlord's designee a
written statement stating: the date of this Lease was executed and the date it
expires; the date Tenant entered into occupancy of the Premises; the amount of
Basic Rent and Additional Rent and the date to which such Rent has been paid;
and certifying (to the extent that the same is true and correct): that this
Lease is in full force and effect and has not been assigned, modified,
supplemented or amended in any way (or specifying the date of agreement so
effecting this Lease); that this Lease represents the entire agreement between
the parties as to this leasing; that any conditions under this Lease to be
performed by Landlord have been satisfied; that any required contributions by
Landlord to Tenant on account of Tenant's improvements have been received; that
there are no existing defenses or offsets which Tenant has against the

                                       23
<PAGE>   24

enforcement of this Lease by Landlord; that no Rent has been paid in advance;
and stating the amount of the Security Deposit paid to Landlord. It is intended
that any such statement may be relied upon by a prospective purchaser of
Landlord's interest or a mortgagee of Landlord's interest or assignee of any
mortgage upon Landlord's interest in the Property. If Tenant shall fail to
respond within ten (10) business days of receipt by Tenant of a reasonable
written request by Landlord as herein provided, Tenant shall be deemed to have
given such certificate as above provided without modification and shall be
deemed to have admitted the accuracy of any information supplied by Landlord to
a prospective purchase or mortgagee and that this Lease is in full force and
effect, that there are no uncured defaults in Landlord's performance; that the
Security Deposit is as stated in this Lease and that not more than one month's
Rent has been paid in advance.

         34.      TRANSFER OF LANDLORD'S INTEREST

                  This Lease shall be assignable by Landlord without the consent
of Tenant. In the event of any transfer or transfers of Landlord's interest in
the Premises or the Property, other than a transfer for security purposes only,
the transferor shall be automatically relieved of any and all obligations and
liabilities on the part of Landlord accruing from and after the date of such
transfer and Tenant agrees to attorn to the transferee.

          35.     RIGHT TO PERFORM

                  If Tenant shall fail to pay any sum of money, other than Rent,
required to be paid by Tenant hereunder or shall fail to perform any other act
on Tenant's part to be performed hereunder, and such failure shall continue for
ten (10) business days after notice thereof by Landlord, Landlord may, but shall
not be obligated so to do, and without waiving or releasing Tenant from any
obligations of Tenant, make any such payment or perform any such other act on
Tenant's part to be made or performed as provided in this Lease. Landlord shall
have (in addition to any other right or remedy of Landlord) the same rights and
remedies in the event of the nonpayment of sums due under this Section as in the
case of default by Tenant in the payment of Rent.

         36.      EXECUTION OF LEASE BY LANDLORD

                  The submission of this document for examination and
negotiation does not constitute an offer to lease, or a reservation of or option
for the Premises, and this document shall become effective and binding only upon
execution and delivery by Landlord. No act or omission of any employee or agent
of Landlord or of Landlord's broker shall alter, change or modify any of the
provisions hereof.

         37.      GENERAL

                  37.1     TITLES

                           The title to sections of this Lease are not a part of
this Lease and shall have no effect upon the construction or interpretation of
any part hereof.

                                       24
<PAGE>   25

                  37.2     GOVERNING LAW

                           This Lease shall be construed and governed by the
laws of the State of Washington. Spokane County Superior Court shall be the
venue for any lawsuit or other legal proceedings.

                  37.3     BINDING EFFECT

                           All of the covenants, agreements, terms and
conditions contained in this Lease shall apply to and be binding upon Landlord
and Tenant and their respective heirs, executors, administrators, successors and
assigns.

                  37.4     NO BROKER ENGAGED BY TENANT

                           Tenant represents and warrants to Landlord that
Tenant has not engaged any broker, finder or other person who would be entitled
to any commission or fee in respect of the negotiation, execution or delivery of
this Lease and shall indemnify and hold harmless Landlord against any loss,
cost, liability or expense incurred by Landlord as a result of any claim
asserted by any such broker, finder or other person on the basis of any
arrangements or agreements made or alleged to have been made by or on behalf of
Tenant.

                  37.5     ENTIRE AGREEMENT

                           This Lease contains all covenants and agreements
between Landlord and Tenant relating in any manner to the lease, use and
occupancy of the Premises and other matters set forth in this Lease. No prior
agreements or understanding pertaining to the same shall be valid or of any
force or effect and the covenants and agreements of this Lease shall not be
altered, modified or added to except in writing signed by Landlord and Tenant.

                  37.6     VALIDITY

                           Any provision of this Lease which shall prove to be
invalid, void or illegal shall in no way affect, impair or invalidate any other
provision hereof and the remaining provisions hereof shall nevertheless remain
in full force and effect.

                  37.7     INTEREST

                           Any Rent or other sums payable by Tenant to Landlord
which shall not be paid within fifteen (15) days after the due date thereof
shall bear interest from the date tenant received notification that such sums
are past due at the Default Rate calculated from the date of delinquency to the
date of payment.

                  37.8     INTERPRETATION

                           This Agreement and each of the terms and provisions
hereof are deemed to have been explicitly negotiated between the parties, and
the language in all parts of this Agreement shall, in all cases, be construed
according to its fair meaning and not strictly for or against either party.

                                       25
<PAGE>   26

                  37.9     AUTHORIZATION

                           If Tenant is a corporation or partnership, Tenant
represents and warrants that the execution, delivery and performance of this
Lease have been duly authorized by all necessary persons. The officer or partner
executing this Lease on behalf of Tenant further individually represents and
warrants that he or she is duly authorized to execute and deliver this Lease to
Landlord on behalf of Tenant.

                  37.10    NO RECORDING

                           Tenant shall not record this Lease or any notice or
memorandum thereof in the records of the county auditor without Landlord's prior
written consent.

                  37.11    REPLACEMENT AND CANCELLATION OF PRIOR LEASE.

                           In entering into this Lease, the parties do hereby
agree that on the effective date and after full execution of this Lease, that
certain Lease, dated May 1st, 1998, between Landlord and Tenant for the Premises
shall automatically terminate in advance of its Termination Date and shall have
no further force or effect, without penalty. Although this will replace the
prior Lease, there shall be no transfer of benefits, obligations or
interpretations carried forward to this Lease unless they are specifically
included herein.

             [The remainder of this page intentionally left blank.]

                                       26
<PAGE>   27

         IN WITNESS WHEREOF, the parties hereto have executed this Lease as of
the day and year first above set forth.

LANDLORD:                SPOKANE TEACHERS CREDIT UNION

                         By:    /s/ STEVEN L. DAHLSTROM
                               ----------------------------
                                     (signature)

                                Steven L. Dahlstrom
                               ----------------------------
                                   (print name)

                         Title: President
                               ----------------------------

TENANT:                  SPECTRUM INTEGRATED SERVICES, INC.,
                         D/B/A SOFTWARE SPECTRUM

                         By:    /s/ ROBERT D. GRAHAM
                               ----------------------------
                                     (signature)

                                Robert D. Graham
                               ----------------------------
                                     (print name)

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

<PAGE>   28

STATE OF WASHINGTON        )
                           )  ss
County of Spokane          )

         On this 10th day of March, 2000, before me, the undersigned, a Notary
Public in and for the State of Washington, duly commissioned and sworn,
personally appeared Steven L. Dahlstrom to me known to be the person who signed
as of SPOKANE TEACHERS CREDIT UNION, the entity that executed the within and
foregoing instrument, and acknowledged said instrument to be the free and
voluntary act and deed of said entity for the uses and purpose therein
mentioned, and on oath that he was duly elected, qualified and acting as said
officer of said entity, that he was authorized to execute said instrument and
that the seal affixed, if any, is the seal of said entity.

         IN WITNESS WHEREOF I have hereunto set my hand and official seal the
day and year first above written.

                                     /s/ SHERI L. MYERS
                                     ----------------------------------
                                         Sheri L. Myers
                                     Notary Public in and for the State of
                                     Washington, residing at Spokane
                                     My Commission expires: 9/15/00
                                                           ------------

STATE OF TEXAS             )
                           )  ss
County of Dallas           )

         On this 14th day of March, 2000, before me, the undersigned, a Notary
Public in and for the State of Texas, duly commissioned and sworn, personally
appeared Robert D. Graham to me known to be the person who signed as Vice
President of SPECTRUM INTEGRATED SERVICES, INC., D/B/A SOFTWARE SPECTRUM, the
corporation that executed the within and foregoing instrument, and acknowledged
said instrument to be the free and voluntary act and deed of said corporation
for the uses and purpose therein mentioned, and on oath that he was duly
elected, qualified and acting as said officer of said entity, that he was
authorized to execute said instrument and that the seal affixed, if any, is the
seal of said corporation.

         IN WITNESS WHEREOF I have hereunto set my hand and official seal the
day and year first above written.

                                     /s/ CHRISTI M. BAKER
                                     -------------------------------------------
                                     Notary Public in and for the State of
                                     Texas, residing at Dallas County
                                                        -----------------------
                                     My Commission expires: 9/16/02
                                                           --------------------

<PAGE>   29

                          EXHIBIT A, LEGAL DESCRIPTION
Parcel A:

That portion of Parcel 1, Block 1, Binding Site Plan 33-92, according to Site
Plan recorded in Book 1 of Binding Site Plans, Pages 61 and 62, in Spokane
County, Washington, described as follows:

BEGINNING at the Southwest corner of Parcel 1 of Spokane County Binding Site
Plan No. 33-92; Thence along the Westerly line of said Parcel 1 the following
five courses:

1. North 02(degree)56'04" West, 346.82 feet;

2. North 69(degree)35'51" West, 20.25 feet;

3. Northwesterly 84.12 feet along the arc of a non-tangent circular curve
concave to the Northeast said curve having a radius of 218.89 feet, a central
angle of 22(degree)01'11" and a long chord that bears North 54(degree)21'51"
West, 83.61 feet;

4. Northwesterly 13.33 feet along the arc of a circular curve concave to the
Southwest, said curve having a radius of 20.00 feet, a central angle of
38(degree)10'56" and a long chord that bears North 62(degree)26'44" West, 13.08
feet;

5. Northwesterly 18.55 feet along the arc of a circular curve concave to the
Northeast, said curve having a radius of 50.00 feet, a central angle of
21(degree)15'27" and a long chord that bears North 70(degree)54'29" West, 18.44
feet, to the Northwest corner of said Parcel 1;

Thence North 59(degree)53'21" East, along the North line of said Parcel 1,
315.86 feet;

Thence South 02(degree)56'04" East, 564.79 feet, to the Northerly right of way
line of Mission Avenue;

Thence South 87(degree)03'56" West along said right of way line, 168.66 feet to
the Point of Beginning.

Parcel B:

A Parcel of Land located in the East half of the East half of the Southwest
quarter and the West half of the West half of the Southeast quarter of Section
10, Township 25 North, Range 45 East, W.M., in Spokane County, Washington, more
particularly described as follows:

BEGINNING at the South quarter corner of said Section from which the Southeast
corner of said Section bears North 87(degree)03'56" East;

Thence North 30(degree)56'04" West, a distance of 562.49 feet to Southerly right
of way of the Chicago, Milwaukee and St. Paul Railroad;

Thence North 59(degree)53'21" East along said Southerly right of way, a distance
of 30.00 feet to the true point of beginning of this description;

Thence continue along said Southerly right of way North 59(degree)53'21" East, a
distance of 480.00 feet to the most Northwesterly corner of Parcel 1 of
Homestead Industrial Properties No. III, according to Binding Site Plan recorded
in Volume 1 of Binding Site Plans, Page 12;

Thence South 30(degree)56'04" East, a distance of 411.00 feet;

Thence South 68(degree)44'58" West, a distance of 486.89 feet;

Thence North 30(degree)56'04" West, a distance of 336.00 feet to the True Point
of Beginning.

Exhibit A
Page 1

<PAGE>   30

Parcel C:

A Parcel of land located in the East half of the East half of the Southwest
quarter and the West half of the West half of the Southeast quarter of Section
10, Township 25 North, Range 45 East, W.M., in Spokane County, Washington, being
more particularly described as follows:

BEGINNING at the South quarter corner of said Section from which the Southeast
corner of said section bears North 87(degree)03'56" East;

Thence North 30(degree)56'04" West, a distance of 33.97 feet to the Northerly
right of way of Mission Avenue as it now exists 60.00 feet in width on March 27,
1979, and the True Point of Beginning;

Thence South 87(degree)03'56" West, a distance of 33.97 feet;

Thence North 30(degree)56'04" West a distance of 413.86 feet to the beginning of
a non-tangent curve concave to the Northeast from which the radius bears North
19(degree)24'09" West, a distance of 50.00 feet;

Thence Northerly along said curve through a central angle of 156(degree)56'19",
an arc distance of 136.96 feet;

Thence North 30(degree)56'04" West, a distance of 1.16 feet to the former
Southerly right of way of the Chicago, Milwaukee and St. Paul Railroad;

Thence North 59(degree)53'21" East, a distance of 60.00 feet;

Thence South 30(degree)56'04" East, a distance of 544.03 feet to the Northerly
right of way of said Mission Avenue;

Thence South 87(degree)03'56" West, a distance of 33.97 feet to the True Point
of Beginning;

EXCEPT that portion deeded to Spokane County for Signal Road by Right of Way
Deed recorded April 1, 1986, under Auditor's File No. 8604010235, described as
follows:

BEGINNING at the South quarter corner of said Section from which the Southeast
corner of said Section bears North 87(degree)03'56" East;

Thence North 30(degree)56'04" West, a distance of 33.97 feet to the Northerly
right of way line of Mission Avenue as it now exists 60.00 feet in width on
March 27, 1979, and the True Point of Beginning;

Thence South 87(degree)03'56" West, a distance of 33.97 feet;

Thence North 30(degree)56'04" West, a distance of 513.01 feet to the Southerly
right of way line of the Chicago, Milwaukee and St. Paul Railroad;

Thence North 59(degree)53'21" East, a distance of 60.00 feet;

Thence South 30(degree)56'04" East, a distance of 544.03 feet to the Northerly
right of way line of said Mission Avenue;

Thence South 87(degree)03'56" West, a distance of 33.97 feet to the True Point
of Beginning.

Parcel D:

A Parcel of Land in the South half of Section 10, Township 25 North, Range 45
East, W.M., in Spokane County, Washington, described as follows:

BEGINNING at the South quarter corner of said Section, from which the Southeast
corner of said Section bears North 87(degree)03'56" East;

Thence North 30(degree)56'04" West, a distance of 33.97 feet to the North margin
of Mission Avenue as it now exists 60 feet in width on May 27, 1980;

Exhibit A
Page 2

<PAGE>   31

Thence North 87(degree)03'56" East, a distance of 33.97 feet to the True Point
of Beginning of this description, said point being the Southeast corner of
Parcel "B" of the Record of Survey recorded in Book 18 of Surveys, Page 27, in
the Spokane Auditor's Office;

Thence North 30(degree)56'04" West, along the East boundary of said Parcel "B",
a distance of 208.03 feet to the Southwest corner of that parcel of land
conveyed to William W. Main and Norms Lee Main, doing business as William W.
Main Investment Company, by deed dated January 10, 1980, and recorded January
11, 1980, in said Auditor's Office under Auditor's File No. 8001110047;

Thence North 68(degree)44'58" East along the South boundary of said Parcel, a
distance of 486.89 feet to the Southeast corner of said Parcel;

Thence North 30(degree)56'04" West along the boundary of said Parcel and the
boundary of Parcel "A" of said Record of Survey, a distance of 25.00 feet;

Thence North 59(degree)56'27" East, a distance of 201.24 feet to the beginning
of a non-tangent curve concave to the Northeast having a radius of 50.00 feet
(to which a radial line bears South 29(degree)43'15" West);

Thence Southeasterly along said curve through a central angle of
21(degree)15'27" an arc distance of 18.55 feet to the beginning of a reverse
curve concave to the Southwest having a radius of 20.00 feet;

Thence Southeasterly along said curve through a central angle of
38(degree)10'56" an arc distance of 13.33 feet to the beginning of a reverse
curve concave to the Northeast having a radius of 218.89 feet (to which a radial
line bears South 46(degree)38'44" West);

Thence Southeasterly along said curve through a central angle of
27(degree)23'09" an arc distance of 104.62 feet;

Thence South 02(degree)56'04" East a distance of 376.22 feet to said North
margin of Mission Avenue;

Thence South 87(degree)03'56" West along said North margin, a distance of 644.25
feet to the True Point of Beginning.

EXCEPT that portion deeded to Spokane County for Mission Avenue by right of way
deed recorded October 7, 1993 under Auditor's File No. 9310070105 described as
follows:

BEGINNING at the Southeast corner of that parcel shown on the Record of Survey
recorded in Book 22 of Surveys, page 41;

Thence North 02(degree)56'04" West, along the East line of said Parcel, a
distance of 16 feet;

Thence South 87(degree)03'56" West, parallel with the South line of said Parcel,
a distance of 353.73 feet to the beginning of a curve concave to the Southeast
with a radius of 866.05 feet;

Thence Southwesterly along said curve to the South line of said Parcel;

Thence North 87(degree)03'56" East, along said South line to the Point of
Beginning.

Parcel E:

A parcel of land located in the South half of Section 10, Township 25 North,
Range 45 East, W.M., in Spokane County, Washington, described as follows:

BEGINNING at the South quarter corner of said Section from which the Southeast
corner of said Section bears North 87(degree)03'56" East;

Thence North 30(degree)56'04" West, 33.97 feet to the Northerly margin of
Mission Avenue;

Thence North 87(degree)03'56" East along said Northerly margin, a distance of
678.22 feet to a point, said point being the Southeast corner of that parcel
shown on the survey recorded in Book 22 of Surveys, Page 41;

Exhibit A
Page 3

<PAGE>   32

Thence North 02(degree)56'04" West along the Easterly boundary of said parcel, a
distance of 376.22 feet to an angle point in the boundary of said parcel and the
True Point of Beginning of this description;

Thence continue North 02(degree)56'04" West, 0.60 feet;

Thence North 69(degree)35'51" West, 20.25 feet to a point on the Northeasterly
boundary of said parcel, said point being the beginning to a non-tangent curve
concave to the Northeast, the radius of which bears North 24(degree)37'34" East,
218.89 feet;

Thence Easterly along said curve through a central angle of 5(degree)21'58" an
arc distance of 20.50 feet to the True Point of Beginning, in Spokane County,
Washington.

Exhibit A
Page 4

<PAGE>   33

                                   EXHIBIT B-1

                              SITE PLAN OF PROPERTY

[The page contains a drawing showing a site plan of the property on which the
premises is located.]

Exhibit B-1
Page 1

<PAGE>   34

                                   EXHIBIT B-2

                             FLOOR PLAN OF PREMISES

[This page and the following page contain drawings depicting a floor plan of the
premises. The first page shows the floor plan for Building 1, and the second
page shows the floor plan for Building 2.]

Exhibit B-2
Page 1<PAGE>   1
                                                                    EXHIBIT 10.7

                                    NET LEASE

                                    LANDLORD:

                                PRETTY M.T., L.P.
                         A DELAWARE LIMITED PARTNERSHIP

                                     TENANT:

                       SPECTRUM INTEGRATED SERVICES, INC.
                             D/B/A SOFTWARE SPECTRUM
                               A TEXAS CORPORATION

                                 5201 RUFE SNOW
                           NORTH RICHLAND HILLS, TEXAS

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               SUMMARY OF BASIC LEASE INFORMATION AND DEFINITIONS

THIS SUMMARY OF BASIC LEASE INFORMATION AND DEFINITIONS (this "SUMMARY") is
hereby incorporated into and made a part of the Net Lease attached hereto which
pertains to the Premises described in Section 1.3 of this Summary. All
references in the Lease to the "Lease" shall include this Summary. All
references in the Lease to any term defined in this Summary shall have the
meaning set forth in this Summary for such term. Any initially capitalized terms
used in this Summary and any initially capitalized terms in the Lease which are
not otherwise defined in this Summary shall have the meaning given to such terms
in the Lease.

1.1      LANDLORD'S ADDRESS:        PRETTY M.T., L.P.
                                    a Delaware limited partnership
                                    17440 N. Dallas Parkway, Suite 230
                                    Dallas, Texas  75287
                                    Attn: Mr. Leon Backes

1.2      TENANT'S ADDRESS:          SPECTRUM INTEGRATED SERVICES, INC.
                                    D/B/A SOFTWARE SPECTRUM
                                    a Texas corporation
                                    2140 Merritt Drive
                                    Garland, Texas 75041
                                    Attn.: Facilities Director

1.3      PREMISES: An area which the parties hereto hereby stipulate and agree
consists of 73,240 rentable square feet of space and is more particularly
described in the Exhibit A attached to the Lease (the "INITIAL PREMISES")
located in that certain building (the "BUILDING") having an address of 5201 Rufe
Snow, North Richland Hills, Texas, and which Building is located on the land
(the "LAND") more particularly described in the Exhibit B attached to the Lease
(the Land, the Building and all other improvements now or hereafter located on
the Land are herein collectively referred to as the "PROJECT"). As used in the
Lease, the term "Premises" shall mean the Initial Premises together with any
other space in the Project hereafter leased to Tenant pursuant to the terms and
provisions of the Lease and the Exhibits attached thereto. The common area or
multi-tenant add on factor for the Project is 1%.

1.4      COMMENCEMENT DATE: For the portion of the Initial Premises depicted as
"Portion 1" on Exhibit A-1, the earlier to occur of August 1, 2000 and the date
upon which Tenant actually commences to do business in such portion of the
Initial Premises. For the portion of the Initial Premises depicted as "Portion
2" on Exhibit A-2, the earlier of October 15, 2000 and the date upon which
Tenant actually commences to do business in such portion of the Initial
Premises. For the portion of the Initial Premises depicted as "Portion 3" on
Exhibit A-3, the earlier of February 15, 2001 and the date upon which Tenant
actually commences to do business in such portion of the Initial Premises. For
purposes hereof, Tenant's early entry on the Premises in accordance with Section
2.0 of this Summary shall not be deemed to constitute doing business in the
Premises.

1.5      RENT COMMENCEMENT DATE: For the portion of the Initial Premises
depicted on Exhibit A-1, the earlier to occur of August 1, 2000 and the date
upon which Tenant actually commences to do business in such portion of the
Initial Premises. For the portion of the Initial Premises depicted on Exhibit
A-2, the earlier to occur of October 15, 2000 and the date upon which Tenant
actually commences to do business in such portion of the Initial Premises. For
the portion of the Initial Premises depicted on Exhibit A-3, the earlier to
occur of February 15, 2001 and the date upon which Tenant actually commences to
do business in such portion of the Initial Premises. For purposes hereof,
Tenant's early entry on the Premises in accordance with Section 2.0 of this
Summary shall not be deemed to constitute doing business in the Premises.

1.6      LEASE EXPIRATION DATE: The last day of the eighty-seventh (87th) full
calendar month after the first Rent Commencement Date set forth in Section 1.5
of the Summary, which the parties anticipate to be October 31, 2007.

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1.7      ANNUAL RENT:

         (a) For the period commencing on first Rent Commencement Date set forth
in Section 1.5 of the Summary through the 90th day after the first Rent
Commencement Date, Annual Rent shall be payable at the rate of $0.00 per annum;

         (b) For the period commencing on the 91st day after the first Rent
Commencement Date set forth in Section 1.5 of the Summary through the last day
of the 15th full calendar month after the first Rent Commencement Date, Annual
Rent shall be payable at the rate of $9.50 per rentable square foot on an annual
basis for each rentable square foot of the Initial Premises; and

         (c) For the period from the first day of the sixteenth (16th) full
calendar month after the first Rent Commencement Date set forth in Section 1.5
of the Summary Date through the last day of the eighty-seventh (87th) full
calendar month after the first Rent Commencement Date set forth in Section 1.5
of the Summary, Annual Rent shall be payable at the rate of $12.00 per rentable
square foot on an annual basis for the Premises).

         (d) Landlord and Tenant acknowledge that Tenant intends to occupy the
Initial Premises in three (3) stages at the dates set forth in Section 1.5 of
the Summary. The "free rent" set forth in Section 1.7(a) above shall only apply
to the portion of the Initial Premises occupied by Tenant during the first
ninety (90) days following the first Rent Commencement Date set forth in Section
1.5 of the Summary. For example, if completion of the Tenant Improvements (as
defined in Exhibit L attached hereto) is accomplished and Tenant occupies the
Initial Premises in stages on the actual dates set forth Section 1.5 of the
Summary, then Tenant shall be entitled to "free rent" with respect to the
portion of the Initial Premises depicted on Exhibit A-1 for the time period from
August 1, 2000 through October 31, 2000, Tenant shall be entitled to "free rent"
with respect to the portion of the Initial Premises depicted on Exhibit A-2 for
the time period from October 15, 2000 through October 31, 2000, and Tenant shall
not be entitled to any "free rent" with respect to the portion of the Initial
Premises depicted on Exhibit A-3.

1.8       PERMITTED USE: The Premises may be used for general office use
including the operation of a telephone call center.

1.9       DEFAULT INTEREST RATE: The lesser of the following: (a) the rate
announced from time to time by Citibank, N.A. or, if Citibank, N.A. ceases to
exist or ceases to publish such rate, then the rate announced from time to time
by the largest(as measured by deposits) chartered operating bank operating in
New York, as its "prime rate", "best rate", or "reference rate", plus two
percent (2%) (such rate is referred to herein as the "INTEREST RATE"); or (b)
the maximum rate permitted by law.

2.0       TENANT'S EARLY ACCESS TO THE INITIAL PREMISES. Subject to the
provisions of Section 12.3 of this Lease, Tenant shall have the right to enter
the Initial Premises prior to the Commencement Date, but no sooner than June 5,
2000, for the purpose of installing Tenant's interior construction improvements
and its equipment and furnishings in the Initial Premises as further described
herein.

2.1      SECURITY DEPOSIT. None.

                                       ii

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                                    NET LEASE

         THIS NET LEASE (this "LEASE"), which includes the preceding Summary of
Basic Lease Information and Definitions (the "SUMMARY") attached hereto and
incorporated herein by this reference, is made as of April 28, 2000 (the
"EFFECTIVE DATE"), between PRETTY M.T., L.P., a Delaware limited partnership
("LANDLORD") and SPECTRUM INTEGRATED SERVICES, INC., d/b/a SOFTWARE SPECTRUM, a
Texas corporation ("TENANT").

1.       LEASE OF PREMISES.

1.1      PREMISES. Landlord hereby leases to Tenant and Tenant hereby leases
from Landlord the Premises upon and subject to the terms, covenants and
conditions contained in this Lease to be performed by each party.

1.2.     NET LEASE; NON-TERMINABILITY.

         (a) This is a net Lease to Landlord. It is the intent of the parties
hereto that the Tenant shall pay all costs and expenses relating to the use,
operation, maintenance and repair of the Premises and the business of Tenant
carried on therein (including, without limitation, taxes and insurance, utility
and maintenance costs) unless otherwise expressly provided in this Lease. Any
amount or obligation herein relating to the use and occupancy of the Premises by
Tenant which is not expressly stated herein to be an obligation of Landlord
shall be deemed to be an obligation of Tenant to be performed by Tenant at
Tenant's expense. Except as expressly provided in this Lease, Annual Rent,
additional rent and all other sums payable hereunder by Tenant shall be paid
without notice, demand, setoff, counterclaim, abatement, suspension, deduction
or defense.

         (b) Except as may be expressly provided in this Lease, this Lease shall
not terminate, nor shall Tenant have any right to terminate this Lease, nor
shall Tenant be entitled to any abatement of Rent (as defined in Section 3.2
below), nor shall the obligations of Tenant under this Lease be affected by
reason of (i) any damage to or destruction of all or any part of the Premises
from whatever cause; (ii) the taking of the Premises or any portion thereof by
condemnation, requisition or otherwise; (iii) the prohibition, limitation or
restriction of Tenant's use of all or any part of the Premises, or any
interference with such use other than by Landlord or any of Landlord's agents or
employees; (iv) Tenant's acquisition or ownership of all or any part of the
Premises; (v) any default on the part of Landlord under this Lease, or under any
other agreement to which Landlord and Tenant may be parties; or (vi) the failure
of Landlord to deliver possession of the Premises on the dates set forth in
Section 12.1. It is the intention of the parties hereto that the obligations of
Tenant hereunder shall be separate and independent covenants and agreements,
that the Annual Rent, the additional rent and all other sums payable by Tenant
hereunder shall continue to be payable in all events and that the obligations of
Tenant hereunder shall continue unaffected, unless the requirements to pay or
perform the same shall have been suspended or terminated pursuant to an express
provision of this Lease.

         (c) Tenant agrees that it will remain obligated under this Lease in
accordance with its terms and that it will not (except as expressly permitted
herein) take any action to terminate, rescind or avoid this Lease,
notwithstanding the bankruptcy, insolvency, reorganization, composition,
readjustment, liquidation, dissolution, or winding-up or other proceeding
affecting Landlord or its successors in interest.

         (d) Except as otherwise permitted in this Lease or under applicable
law, Tenant waives all rights which may now or hereafter be conferred by law (i)
to quit, terminate or surrender this Lease or the Premises or any part thereof,
or (ii) to any abatement, suspension, deferment, offset, or reduction of the
Annual Rent, additional rent or any other sums payable under this Lease.

2.       TERM.

2.1      TERM. The initial term of this Lease (the "INITIAL TERM") shall
commence upon the Commencement Date and shall expire on the Lease Expiration
Date, unless sooner terminated. As used in this Lease, the "Term" shall mean the
Initial Term together with any renewal thereof, whether pursuant to the terms of
this Lease or otherwise by a written agreement thereof executed by Landlord and
Tenant.

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<PAGE>   5

2.2      DELIVERY OF POSSESSION. Landlord agrees to deliver possession of the
Initial Premises upon substantial completion of the work described in Section
12.1 herein below and in Exhibit K-1 attached hereto. When Landlord has
substantially completed such work, Tenant agrees to proceed with due diligence
to perform the work described in Section 12.2 herein below and in Exhibit L
attached hereto, all of such work to be performed in compliance with the terms
of this Lease.

2.3      OPTION TO EXTEND. Tenant shall have two (2) consecutive options (the
"EXTENSION OPTIONS") to extend the Term and Lease Expiration Date for a period
(the "OPTION PERIODS") of not less than three (3) years but up to seven (7)
years per option, each such period commencing upon the then-current Lease
Expiration Date upon the same terms and conditions as are applicable for the
Premises under the Lease for the Initial Term, except for the amount of Annual
Rent payable under this Lease (which amount shall be determined as set forth
below). An Extension Option may be validly exercised only by notice in writing
received by Landlord not later than one hundred eighty (180) days prior to
commencement of the applicable Option Period; provided, however, that the
applicable Extension Option may be validly exercised only if no uncured Tenant
default exists as of the date of exercise. If Tenant does not exercise an
Extension Option in strict accordance with the provisions hereof or as otherwise
agreed in writing by Landlord and Tenant, such Extension Option and all
subsequent Extension Options shall forever terminate and be of no further force
or effect. Tenant's Extension Options shall be upon all of the terms and
conditions of this Lease, except that (i) the grant of any exercised Extension
Option shall no longer apply; (ii) Landlord shall not be obligated to perform
any work to the Premises or provide Tenant with any refurbishment or similar
allowances, except as may be determined in accordance with the determination of
Fair Market Rental (as defined in Section 2.4 below); and (iii) the Annual Rent
during the first Option Period shall be payable at the Fair Market Rental per
rentable square foot per annum, and the Annual Rent during the second Option
Period shall be payable at the Fair Market Rental per rentable square foot per
annum. In the event the named Tenant herein (i.e., Spectrum Integrated Services,
Inc., d/b/a Software Spectrum Support Services) or any Transferee (as defined in
Section 14.4 below) following a Permitted Transfer (as defined in Section 6.9
below) shall not be in occupancy of, and conducting business in, all of the
Premises, any rights granted pursuant to this Section shall be null and void.
Additionally, Tenant's rights under this Section shall terminate following the
occurrence of any of the following events: (a) a termination of Tenant's right
to possess all or any portion of the Premises; and/or (b) any termination of
this Lease.

2.4      FAIR MARKET RENTAL.

(a)      For purposes hereof, "FAIR MARKET RENTAL" shall mean the base rent
payable during the applicable lease period to a willing landlord by a willing
tenant (neither having a compulsion to lease and Landlord having sufficient time
to locate a replacement tenant), for the lease of non-sublease, non-equity real
property office buildings, of like size to the Premises, of like and comparable
quality to the Premises and the Building, which comparable property and
improvements are located in the North Richland Hills Office Market (as
hereinafter defined), taking into consideration the terms of this Lease
(including, without limitation, the available parking being made available to
Tenant and whether or not any Landlord's Contribution shall be payable) and the
following concessions (collectively, the "CONCESSIONS"): (a) rental abatement
concessions, if any, being granted such tenants in connection with such
comparable property; (b) the value of interior tenant improvements and interior
tenant improvement allowances provided or to be provided for such comparable
property; and (c) other reasonable monetary concessions being granted such
tenants in connection with such comparable property; provided, however, that in
calculating the Fair Market Rental, no consideration shall be given to any
period of rental abatement, if any, granted to tenants in comparable
transactions in connection with the design, permitting and construction of
improvements for such comparable property. As used herein, the term "NORTH
RICHLAND HILLS CORRIDOR OFFICE MARKET" shall mean the area within a twenty (20)
mile radius of the Building. At least six (6) months prior to the commencement
of the applicable Option Period, Landlord shall notify Tenant of the Fair Market
Rental as determined by Landlord (such determination by Landlord of the Fair
Market Rental is herein referred to as "Landlord's Assessment"). Tenant shall,
within thirty (30) days after Tenant's receipt of Landlord's Assessment, notify
Landlord in writing whether Tenant accepts or rejects Landlord's Assessment. The
failure of Tenant to so notify Landlord shall be deemed to be an acceptance by
Tenant of Landlord's Assessment and the same shall be the Fair Market Rental. If
Tenant timely delivers to Landlord written notice that Tenant does not accept
Landlord's Assessment ("Tenant's Objection Notice"), the Fair Market Rental
shall be determined as provided in the following subparagraph. Tenant's
Objection Notice must identify Tenant's determination of the Fair Market Rental
("TENANT'S ASSESSMENT") to trigger the following appraisal process.

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(b)      If Tenant timely delivers to Landlord Tenant's Objection Notice in
which Tenant's Assessment has been identified, Landlord shall have the right to
accept Tenant's Assessment by giving Tenant written notice thereof within ten
(10) business days after Landlord's receipt of Tenant's Objection Notice. If
Landlord does not so accept Tenant's Assessment, then Landlord and Tenant shall,
within fifteen (15) days after the expiration of such ten (10) business day
period, jointly appoint an independent real estate broker or other person with
at least ten (10) years' commercial real estate experience in Dallas, Texas (an
"APPRAISER") to determine the Fair Market Rental. If the parties are unable to
agree upon an Appraiser within such fifteen (15) day period, either party may
request that the Dallas office of the American Arbitration Association
designate, within ten (10) days of such request, a broker with at least ten (10)
years' commercial real estate experience in the Dallas-Fort Worth, Texas area to
be the Appraiser for the purposes of this Section; provided, however, in no
event shall such designated Appraiser be employed, or have been employed, by
either Landlord or Tenant or their respective Affiliates (as defined in Section
14.5 below). Such designation shall be binding on Landlord and Tenant. Within
ten (10) business days after the selection of an Appraiser, each of Landlord and
Tenant shall submit to the Appraiser such party's determination of the Fair
Market Rental (revised, if applicable, from any earlier determination), together
with such supporting data used to make such determination. Within fifteen (15)
days after the selection of the Appraiser, the Appraiser shall select the
determination of the Fair Market Rental for the Option Period which is closest
to such Appraiser's determination of the Fair Market Rental, and such
determination shall be the Fair Market Rental for the applicable Option Period.
The entire cost for the Appraiser's services shall be borne equally by Landlord
and Tenant.

3.       RENT.

3.1      ANNUAL RENT. Tenant agrees to pay Landlord, as rent for the Premises,
the Annual Rent designated in Section 1.7 of the Summary. The Annual Rent shall
be paid by Tenant in twelve (12) equal monthly installments in advance on the
first day of each and every calendar month commencing upon the Rent Commencement
Date. Rent for any partial month shall be prorated in the proportion that the
number of days this Lease is in effect during such month bears to the actual
number of days in such month.

3.2      ADDITIONAL RENT. All amounts and charges payable by Tenant under this
Lease in addition to the Annual Rent described in Section 3.1 above shall be
considered additional rent for the purposes of this Lease, and the word "Rent"
in this Lease shall include the Annual Rent and such additional rent unless the
context specifically or clearly implies that only the Annual Rent is referenced.
The Annual Rent and additional rent shall be paid to Landlord as provided in
Section 7, without any prior demand therefor and without any deduction or offset
except as may be specified elsewhere in this Lease.

4.       TENANT'S EXPENSE PAYMENT.

4.1      TENANT'S REQUIREMENT TO PAY EXPENSES. In addition to Annual Rent,
Tenant shall pay as additional rent, Tenant's Share (as defined in Section 4.3
below) of Project Expenses (as defined in Section 4.2 below). Such payment shall
hereafter be referred to as "TENANT'S EXPENSE PAYMENT." Landlord may, if it
elects, either deliver to Tenant periodic statements of Tenant's Expense Payment
(but not more frequently than monthly) or Landlord may estimate the amount of
Tenant's Expense Payment payable by Tenant for any calendar year or any portion
thereof. In the event Landlord elects to provide Tenant with periodic statements
of Tenant's Expense Payment, then Tenant shall pay Landlord the amount reflected
on such statements within thirty (30) days of Tenant's receipt of such
statements. In the event Landlord elects to estimate Tenant's Expense Payment
for any calendar year, Landlord shall provide written notice of the estimate of
Tenant's Expense Payment for the applicable calendar year and the monthly
installment due for each month during such calendar year at least thirty (30)
days prior to the date such installments become due and payable. Tenant shall
pay to Landlord on the first day of each calendar month during any calendar year
Landlord elects to estimate Tenant's Expense Payment, the amount of the
applicable monthly installments, without demand. Landlord shall, on or before
the first day of July of each calendar year, determine the actual Tenant's
Expense Payment for the preceding calendar year and provide Tenant with written
notice thereof. If Tenant's actual payments of estimated Tenant's Expense
Payment are lesser than Tenant's share of actual Tenant's Expense Payments for
such year, then Tenant shall pay to Landlord the amount of the deficiency within
thirty (30) days from the date of Landlord's notice of deficiency.
Alternatively, if Tenant's actual payments of estimated Tenant's Expense
Payments are greater than the actual Tenant's Expense Payment for such year,
then Landlord shall credit the amount of the surplus against the next accruing
installments of Tenant's Expense Payment.

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4.2      DEFINITION OF "TENANT'S SHARE". For Project Expenses that are not
reserved, allocated or dedicated to Tenant or any other tenant of the Project,
the term "TENANT'S SHARE" shall mean a fraction, the numerator of which is the
rentable area of the Premises and the denominator of which is the rentable area
of the Project. For Project Expenses that are specifically and exclusively
attributable to the Premises or to those portions of the Common Areas (as
defined in Section 4.5 below) that are reserved or designated for exclusive
use by Tenant, the term "TENANT'S SHARE" shall mean 100%; provided, the parties
acknowledge and agree that the Exclusive Parking Area (as hereinafter defined)
is not an area for which Tenant's Share shall mean 100%. In the event that
during all or any portion of any calendar year the Project is not fully rented,
fully occupied and/or being completely provided with standard work and/or
services, Landlord shall make an appropriate adjustment of Project Expenses for
such year, employing sound accounting and management principles, to determine
the Project Expenses that would have been paid or incurred by Landlord had the
Project been fully rented and/or occupied, and the amount so determined shall be
deemed to have been the Project Expenses for such year.

4.3      DEFINITION OF "PROJECT EXPENSES". As used herein, the term "PROJECT
EXPENSES" shall mean all direct costs and expenses of operation, security,
protection, replacement of non-capital items, and replacement of capital items
as specifically authorized and not excluded herein, repair and maintenance of
the Project incurred by Landlord, as determined by sound, accrual basis,
accounting principles consistently applied and in accordance with customary real
estate accounting practices, and shall include (i) all costs incurred in
connection with the ownership and operation of the Common Areas; all property
and liability insurance premiums, including without limitation, rent
loss/interruption insurance; reasonable accounting and legal fees; costs
incurred in the management of the Project; and dues, taxes and/or assessments
imposed by any applicable property owners' association if any, excluding
however, any assessments to the extent allocable to capital improvements; plus
(ii) all real property taxes and assessments, water and sewer rents and charges,
utilities and communications taxes and charges, any similar impositions in lieu
of other impositions now or previously within the definition of real property
taxes or assessments, all other government charges, general and special,
ordinary and extraordinary, foreseen and unforeseen, which are, at any time,
prior to or during the Term, imposed upon or assessed against the Project
(exclusive of federal, state or other income taxes and franchise taxes, Rent
Taxes [as defined in Section 10. 1 below] and change in ownership taxes and
assessments); plus (iii) all costs whatsoever incurred by Landlord in connection
with the use, operation, maintenance and repair of the Project, excepting only
those specific costs and expenses that Landlord has specifically agreed to bear
with no reimbursement from Tenant.

4.4      ITEMS NOT INCLUDED IN PROJECT EXPENSES. The parties hereby agree and
acknowledge that the term "Project Expenses" shall not include any capital
expenditures except expenditures (x) for capital improvements to the Project
(including, without limitation, professional fees, consultants' fees and
services contracted for in connection with such capital improvements) that are
(1) primarily for the purpose of reducing Project Expenses, but in such event,
only if such capital expenditures actually result in such a reduction, (2) made
in order to prevent interruption of any of the services to be provided by
Landlord to Tenant pursuant to this Lease, or (3) made in order to comply with
Laws (as hereinafter defined) enacted after the date this Lease is executed that
are applicable to the Project, the cost(s) of which shall be amortized over the
useful life of the improvement with interest at twelve percent (12%) per annum
on the unamortized amount; or (y) any capital improvements to the Project that
are minor in nature (i.e., cost less than $10,000.00). Project Expenses shall
not include any costs or expenses that are separately metered and/or payable
solely by Tenant or by other tenants of the Project. No item will be included
more than once in determining Project Expenses. Project Expenses also will not
include any of the following: (a) costs incurred in marketing space in the
Project or for specific tenants or prospective tenants, including without
limitation, building-out, renovating or decorating or redecorating space for
tenants or other occupants of the Project in the Project; (b) depreciation of
the Project and all equipment, fixtures, improvements and facilities used in
connection therewith or other non-cash items; (c) financing costs, including,
without limitation, interest and principal payments and fees and points, on
loans secured by mortgages or deeds of trust covering all or any portion of the
Project, and other debt costs, if any, and rental under any ground lease or
other underlying lease, if any, covering all or any portion of the Project; (d)
real estate brokers' leasing commissions or compensation, attorneys' fees, costs
and disbursements and other expenses incurred in connection with negotiations
for leases with tenants and/or prospective occupants of the Project; (e) any
cost or expenditure (or portion thereof) for which Landlord is reimbursed,
whether by insurance proceeds or otherwise (Tenant's Expense Payment, and
similar payments made under similar provisions in other tenant leases, are not
reimbursements); (f) any wages, salaries or other compensation paid to any
employee not employed at least in part for or on behalf of the Project (provided
that such costs for employees working in the Project part-time must be allocated
by Landlord on a pro rata basis to the Project); (g) that portion of any cost or
expense which is allocated by Landlord to, or is performed solely for the

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<PAGE>   8

benefit of, any property owned or operated by Landlord other than the Project;
(h) legal, accounting and similar or related costs paid or incurred in
connection with any sale, syndication, financing or refinancing involving the
Project and/or the Premises or any of Landlord's interest therein; (i) any fees,
fines, penalties and/or interest incurred by Landlord as a result of Landlord's
noncompliance with any applicable Laws; (j) any costs (including, without
limitation, legal fees and expenses), fees, fines, penalties and/or interest
incurred by Landlord as a result of Landlord's failure to timely pay any
obligations of Landlord (including, without limitation, Landlord's failure to
timely pay real property taxes and assessments); (k) costs of disputes between
Landlord and any third party regarding matters not related to the Project; (l)
costs associated with business dealings with, and any lawsuits involving,
partners or other persons holding equity, lenders or ground lessors of Landlord;
(m) any debt losses, rent losses or reserves for bad debt; (n) Landlord's
general corporate overhead and general and administrative expenses, including,
in any event, any costs and expenses associated with Landlord's internal
financing or business dealings and salaries of Landlord's executive officers or
any employee or agent above the grade of building manager; (o) any compensation
paid to clerks, attendants or other persons in commercial concessions operated
by Landlord or an affiliate of Landlord; (p) advertising and promotional
expenditures for leasing space in the Project; (q) costs arising from Landlord's
charitable or political contributions; (r) costs for sculptures, paintings or
other objects of art; (s) Landlord's income taxes, excess profit taxes,
franchise taxes or similar taxes levied on Landlord's business; (t) costs of any
goods or services acquired from an Affiliate of Landlord or of the manager of
the Project to the extent in excess of the costs that would be paid to an
unaffiliated, third-party provider of such goods or services; (u) costs and
expenses incurred (whenever incurred) in removing any Hazardous Materials or
remediating damage to the extent therefrom; (v) any costs or expenses incurred
(regardless of when incurred) to the extent necessary to make the Project comply
with Laws in effect on the date this Lease is executed; (w) costs allocable to
future development of the Project or other real estate; (x) any costs or
expenditures related to the roof, exterior walls or foundation of the Project,
other than ordinary maintenance costs and capital expenditures that are
expressly permitted by the first sentence of this Section 4.4; (y) any costs
related to any breach of any covenant, representation or warranty of Landlord
contained in this Lease, whether capital or non-capital in nature; and (z) any
costs (capital or non-capital) incurred by Landlord to cure or repair any
structural or design defects (including latent defects) in the Project, the
building systems at the Project, or the common areas of the Project or any
violations of the building code of the City of North Richland Hills, other than
ordinary maintenance costs, normal wear and tear, and capital expenditures that
are expressly permitted by the first sentence of this Section 4.4. The foregoing
exclusions shall not relieve Tenant or Landlord from their obligations under any
other provisions of this Lease. For informational purposes only, attached as
Rider D is a list of personnel which Landlord currently anticipates will be
employed at least in part for or on behalf of the Project, and Tenant
acknowledges that Landlord may, in its sole discretion, increase, decrease, and
otherwise change the personnel which Landlord currently anticipates will be
employed at least in part for or on behalf of the Project, without any notice to
or permission from Tenant.

4.5      COMMON AREAS. The "COMMON AREA" and the "COMMON AREAS" are the part of
the Project designated by Landlord from time to time for the common use of all
tenants, including, among other facilities, parking areas, sidewalks,
landscaping, curbs, loading areas, private streets and alleys, lighting
facilities, hallways, restrooms, bike lockers, bike paths and pedestrian
pathways, and other areas and improvements provided by Landlord for the common
use of all tenants, all of which shall be subject to Landlord's sole management
and control and shall be operated and maintained in such manner as Landlord, in
its discretion, shall determine. Tenant and its employees, customers,
subtenants, licensees and concessionaires shall have the non-exclusive right and
license to use the Common Area as constituted from time to time, such use to be
in common with Landlord, other tenants of the Project and other persons
permitted by Landlord to use the same. Landlord may temporarily close any part
of the Common Area for such periods of time as may be necessary to prevent the
public from obtaining prescriptive rights thereto or to make repairs or
alterations, provided that Tenant shall have reasonable notice of any such
closures under the circumstances and access to the Premises and its equipment
supporting its operations in the Premises at all times.

4.6      NO PROJECT EXPENSES DURING FREE-RENT PERIOD. Tenant shall not be
required to make any Tenant's Expense Payment, and no such obligation shall
accrue, for the 90-day period described in Section 1.7(a) of the Summary.

4.7      CAP ON PROJECT EXPENSES. The portion of Tenant's Expense Payment other
than and not including the portion thereof attributable to increases due to
matters beyond the control of Landlord acting commercially reasonably in the
management of its expenses as measured by the management practices of comparable
projects to the Project, such as increases in taxes, utilities costs, and/or
insurance costs (the "CONTROLLABLE EXPENSE PAYMENT")

                                      -5-
<PAGE>   9

for any calendar year after the second full calendar year of the Term shall be
limited or "capped" based on a three percent (3%) cumulative cap (e.g., (i) the
Controllable Expense Payment for the third calendar year shall not exceed 103%
of the Controllable Expense Payment for the second calendar year, which is equal
to 1.03 multiplied by the Controllable Expense Payment for the second calendar
year, (ii) the Controllable Expense Payment for the fourth calendar year shall
not exceed 103% of the maximum Controllable Expense Payment for the third
calendar year, which is equal to 1.03 multiplied by 103% of the Controllable
Expense Payment for the second calendar year or 106.09% of the Controllable
Expense Payment for the second calendar year, (iii) the Controllable Expense
Payment for the fifth calendar year shall not exceed 103% of the maximum
Controllable Expense Payment for the fourth calendar year, which is equal to
1.03 multiplied by 106.09 of the Controllable Expense Payment for the second
calendar year or 109.27% of the Controllable Expense Payment for the second
calendar year, (iv) the Controllable Expense Payment for the sixth calendar year
shall not exceed 103% of the maximum Controllable Expense Payment for the fifth
calendar year, which is equal to 1.03 multiplied by 109.27% of the Controllable
Expense Payment for the second calendar year or 112.55% of the Controllable
Expense Payment for the second calendar year, etc.). The parties acknowledge and
agree that taxes, utilities costs, and/or insurance costs are beyond the control
of Landlord and that Tenant's Expense Payment with respect to such expenses
shall not be limited or capped in any respect.

4.8      TENANT'S AUDIT RIGHTS. Provided that no Event of Default has occurred
and is continuing (other than an Event of Default arising out of Tenant's
dispute of Tenant's Share of Project Expenses to which the following audit
rights pertain) Tenant shall have the right, either personally or through an
independent certified public accounting firm (such accounting firm is herein
referred to as "TENANT'S CPA"), to audit Landlord's books and records pertaining
to Project Expenses as provided in this paragraph. Any such audit shall, except
otherwise expressly provided in this subparagraph, be conducted at Tenant's sole
cost and expense and Tenant shall deliver to Landlord the written results of
such audit within thirty (30) days after Tenant receives the same. Tenant
covenants and agrees, for itself and its officers, partners, employees,
attorneys, consultants, agents, contractors and representatives (including,
without limitation, Tenant's CPA), to keep the results of any and all audits of
Landlord's books and records strictly confidential and not disclose such results
except as follows: (1) to the extent the disclosure of such results may be
required by law; and (2) in connection with the enforcement of Tenant's rights
hereunder. Such audit shall be completed within one hundred twenty (120) days
after Tenant's receipt of the applicable Annual Expense Statement, and such
audit shall only cover Landlord's books and records relating to the Project
Expenses for the year covered by the applicable Annual Expense Statement. Such
audit shall be conducted during normal business hours and upon not less than
thirty (30) days' advance written notice to Landlord of the actual time and date
thereof. If, within thirty (30) days following the completion of such one
hundred twenty (120) day audit period, Tenant does not give Landlord written
notice stating in reasonable detail any objection to the applicable Annual
Expense Statement, Tenant shall be deemed to have approved such statement in all
respects. If Tenant's audit reveals that Tenant has overpaid Tenant's Share of
Project Expenses, Landlord shall provide Tenant with full payment of the total
amount of such overpayment within thirty (30) days after Landlord's receipt of
the written evidence of such overpayment. If Tenant's audit reveals that Tenant
has underpaid Tenant's Share of Project Expenses, Tenant shall pay Landlord the
amount of such underpayment contemporaneously with its delivery of the written
results of the applicable audit to Landlord. If Tenant's audit reveals that the
amount of Project Expenses set forth in the applicable Annual Expense Statement
is more than 105% of the actual amount of Project Expenses incurred by Landlord
during the applicable calendar year, then Landlord shall, within thirty (30)
days after Landlord's receipt of written evidence of such incorrect
identification of Project Expenses in the applicable Annual Expense Statement
together with evidence reasonably satisfactory to Landlord of the reasonable
costs incurred by Tenant in connection with the Tenant's audit (as delivered to
Landlord), reimburse Tenant for such costs.

5.       UTILITIES.

5.1      LANDLORD TO FURNISH. Landlord shall furnish to the Premises
electricity, gas, domestic water and sewage services in amounts and in the
capacity as is available at the Premises on the Effective Date. Based on
representations by the utility provider to Landlord, Landlord warrants that
there will be a dual feed power source available to the Premises as of the
Commencement Date. In the event that such dual feed power source is not
available to the Premises as of the Commencement Date, Tenant may, at is option,
by written notice to Landlord prior to the expiration of thirty (30) days after
such Commencement Date, and as its sole remedy, elect to obtain and install a
Power Generator (as defined in Exhibit J hereof) for the Demised Premises, which
Power Generator shall be subject to the provisions of Exhibit J hereto and the
other terms and conditions of this Lease, except that Landlord shall reimburse
Tenant for up to $40,000.00 of the costs of installing such Power Generator.

                                      -6-
<PAGE>   10

5.2      TENANT'S USE. Tenant's use of services in the Premises shall not at any
time exceed the capacity of any of the equipment in the Building, the Project or
otherwise serving the Premises. In order to insure that such capacity is not
exceeded and to avert possible adverse effect upon the Project's services,
Tenant shall not, without Landlord's prior written consent in each instance,
make any alteration or addition to the systems of the Premises. Except to the
extent caused by the gross negligence or willful misconduct of Landlord or its
agents, Landlord shall not be liable in any way to Tenant for any failure or
defect in the supply or character of utility services furnished to the Premises
or for any loss or damage or expense which Tenant may sustain or incur if either
the said supply or character of utility services either fails or changes or is
no longer available for Tenant's requirements at the Premises. Tenant shall
furnish and install all lighting tubes, lamps, and bulbs used in the Premises.
Notwithstanding the foregoing and provided at such time no Event of Default has
occurred and is continuing, (a) if any failure of utility services continues for
a period of two (2) days or more which failure is caused by Landlord, its
employees, or contractors, the Annual Rental (but not any other charges
hereunder) shall equitably abate based on the extent to which Tenant is unable
to operate in the Premises until such services are restored, as Tenant's sole
remedy hereunder; provided, the period of such abatement shall not exceed ninety
(90) days, and (b) if any failure of any utility service occurs and as a result
Tenant is unable to operate in the Premises until such services are restored,
other than and not including any failure caused by Tenant, its employees,
agents, contractors, customers and/or invitees, and such failure has not been
repaired within forty-five (45) days after its occurrence, Tenant shall have the
right, as its sole remedy, to terminate this Lease by providing written notice
to Landlord; provided, Tenant shall as a condition to such termination, Tenant
shall pay and perform any obligations which have accrued prior to such
termination date, including the payment of any rent hereunder.

5.3      COST OF UTILITIES. Tenant shall be solely responsible for and shall
promptly pay directly to the supplying utility companies, all charges for, any
services and/or utilities used, consumed or provided in, furnished to for
attributable to the Premises, and Tenant shall, at its expense, cause all such
services to be provided on a separately-metered basis to the Premises. Tenant
shall reimburse Landlord within thirty (30) days of Landlord's request for
payment for fixture charges and/or water tariffs attributable to the Premises,
if applicable, which are charged to Landlord by utility companies. This charge
will increase or decrease with current charges being levied against Landlord or
the Premises by the local utility company, and will be due as additional rent.
In no event shall Rent abate or shall Landlord be liable for failure in the
supply of any utility services to the Premises, except as provided in Section
5.2 above.

5.4      LANDLORD AS AGGREGATOR. Landlord shall have the right to select the
providers of utility services other than telephone services, the right to act as
the primary energy aggregator to contract for power or other utilities on behalf
of all tenants of the Project, and to switch utility providers at any time;
provided, however, (a) if Landlord re-sells any utility services to the tenants
of the Project, Landlord shall not charge rates for utilities at any time which
are in excess of the amount charged by the local utility service providers under
their published rates, and (b) if any of Tenant's utility services are
separately metered or similarly provided (again, other than telephone services),
Landlord's prior written consent shall be required before Tenant may change
utility service from the incumbent utility service providers, which consent may
be granted or withheld in Landlord's sole discretion, and if such consent is
granted, Tenant or the utility service provider selected by Tenant shall pay all
costs (and shall defend and indemnify Landlord from all liabilities) arising in
connection with Tenant's utility service provider providing utility services to
Tenant. With respect to telephone services provided to Tenant, Tenant or the
utility service provider selected by Tenant shall pay all costs (and shall
defend and indemnify Landlord from all liabilities) arising in connection with
Tenant's telephone service provider providing telephone services to Tenant.
Landlord shall consult with Tenant with respect to the provision of utility
services to the Premises, but Landlord shall have the sole right and authority
to make any decisions regarding same and shall not be bound by any opinions or
recommendations of Tenant

6.       USE.

6.1      GENERAL. Tenant shall use the Premises solely for the Permitted Use
specified in Section 1.8 of the Summary, and shall not use or permit the
Premises to be used for any other use or purpose whatsoever. No auction,
liquidation, going out of business, fire or bankruptcy sales may be conducted
in, on or about the Premises. Tenant shall not use or permit the use of any
portion of the Premises as sleeping apartments, lodging rooms or for any
unlawful purposes. Except as expressly provided in this Lease, in no event shall
Tenant use any area outside the Premises other than for pedestrian and vehicular
ingress and egress to and from the Premises, other than for parking in the areas
currently designated for parking (which shall be provided at no monthly parking
charge to Tenant, other

                                      -7-
<PAGE>   11

than taxes and other costs as provided herein), and other than to perform
Tenant's repairs, maintenance and other obligations under this Lease. Tenant and
its employees shall have access to the Premises 24 hours per day, 7 days per
week throughout the Term; provided, Tenant acknowledges and agrees that Landlord
shall not be required to provide any additional security services to the Project
or the Premises due to Tenant's access to the Premises 24 hours per day, 7 days
per week.

6.2      COMPLIANCE WITH LAWS.

         (a) Tenant shall not use or allow the Premises to be used in violation
of any covenants, conditions and restrictions or other agreements affecting the
Premises, or of any insurance policy in effect with respect to the Premises, or
of any Laws or of any certificate of occupancy issued for the Premises. Tenant
shall, at its sole cost and expense, observe and comply with, and at all times
cause the Premises and Tenant's use thereof to comply with, all requirements of
any board of fire underwriters or similar body relating to the Premises, and all
Laws, contracts, insurance policies and restrictions now or hereafter in force
relating to or affecting the Premises and the condition, use, occupancy,
alteration and/or improvement thereof, including, without limitation, the
provisions of the Americans With Disabilities Act of 1990, 42 U.S.C. Sections
12101-12213, as amended ("ADA"), and any other Disability Laws (as defined in
Section 12 below), as the same pertain to the Premises and Tenant's use,
occupancy, improvement and alteration of the Premises. The foregoing compliance
obligations of Tenant shall include any and all alterations, replacements,
improvements and changes, whether structural or non-structural, unforeseen
and/or extraordinary, whether or not the same are considered capital
expenditures under standard real estate accounting practices ("CAPITAL ITEMS"),
and regardless; of the period of time then remaining in the Term, but shall not
include any alterations, replacements, improvements and changes to any of the
Base Building Components (as defined in Section 11.(b) below), the mechanical
systems of the Building or to any of the Common Areas. Landlord will not
initiate or consent to any change in Laws or enter into or consent to any
contracts, insurance policies and restrictions that would cause Tenant to
violate its obligations under this Section 6.2(a).

         (b) Landlord represents and warrants to Tenant that, after reasonable
investigation and inquiry, Landlord has no knowledge, nor has Landlord received
written notice from any Governmental Authority (as hereinafter defined) since
Landlord acquired the Project, of any existing violation of (i) any Laws of any
Governmental Authority applicable to the ownership, operation, use, maintenance
or condition of the Project or any part thereof (including, without limitation,
ADA and other Disability Laws), or (ii) any restrictive covenant or deed
restriction affecting the Project. Further, Landlord represents and warrants to
Tenant that Landlord has received no written notice of any existing violation of
or of any condition which through lapse of time or otherwise could result in a
violation of (i) any Laws of any Governmental Authority applicable to the
ownership, operation, use, maintenance or condition of the Project or any part
thereof (including, without limitation, ADA and other Disability Laws), or (ii)
any restrictive covenant or deed restriction affecting the Project.

         (c) As used in this Lease and the Exhibits and Riders attached hereto,
the phrases "Landlord's knowledge" or "knowledge of Landlord" or any similar
phrase shall mean the current actual knowledge of the personnel actively
involved in the day to day management of the Project on behalf of Landlord as of
the Effective Date; provided such personnel shall have no liability in
connection therewith.

         (d) As used herein, the term "LAWS" shall mean all laws, statutes,
ordinances, resolutions, rules, codes, regulations, restrictions, policies,
orders, determinations or requirements of any Governmental Authority (as
hereinafter defined) from time to time in existence which affect the Premises,
and the term "GOVERNMENTAL AUTHORITY" shall mean any federal, state, county,
municipal or other government or any governmental or quasi-governmental
subdivision, agency, department, commission, board, bureau, office or
instrumentality or any of them.

6.3      NO NUISANCE OR WASTE. Tenant shall not commit or suffer to be committed
any waste upon the Premises or any nuisance or other act or thing which may
disturb the quiet enjoyment of any other tenant in the Building or owners or
tenants of property adjacent to the Project. Tenant shall not use or permit to
be used, any medium that might constitute a nuisance, such as loud-speakers,
sound amplifiers, phonographs, radios, televisions, or any other sound producing
device which will carry sound outside the Premises. Tenant shall not permit
noise or odors in the Premises which are reasonably objected to by any owner or
tenant of property adjacent to the Project. Upon written notice from Landlord,
Tenant shall immediately cease and desist from causing such noise or odor.

                                      -8-
<PAGE>   12

6.4      SIGNS.

         (a) Except as expressly provided in this Section 6.4, Tenant shall not
install any signs, awnings, canopies or advertisements in, on or about the
Premises (other than interior signs in the Premises which can not be seen
outside the Premises) unless Tenant complies with all Laws and all public and
private restrictive agreements affecting the Premises (including, without
limitation, any master development plan or property owners association
requirements) and obtains prior written approval therefor from all Governmental
Authorities having jurisdiction over the Premises and from Landlord such consent
not to be unreasonably withheld, delayed or conditioned by Landlord. Tenant's
installation and maintenance of such signs (including, without limitation,
Tenant's Sign), awnings, canopies or advertisements need only be in compliance
with those public and private restrictive agreements that copies of which have
theretofore been provided to Tenant by Landlord or any other party prior to the
installation of any such signs, awnings, canopies or advertisements. Tenant
agrees to maintain Tenant's Sign and any other sign, awning, canopy or
advertising matter as may be approved in writing by Landlord in good condition
and repair at all times. At the expiration or earlier termination of this Lease,
at Landlord's election, Tenant shall (i) remove Tenant's Sign and all other
signs, awnings, canopies and advertising approved in writing by Landlord and
installed by or at the direction of Tenant, and (ii) repair any damage to the
Premises resulting from such removal all at Tenant's sole cost and expense. If
Tenant fails to maintain and/or remove Tenant's Sign and any other such approved
sign, awning, canopy or advertising and/or fails to repair any such damage,
Landlord may do so and Tenant shall reimburse Landlord for the actual costs
incurred by Landlord in performing such work. If, without Landlord's prior
written approval or any other required approvals, Tenant installs any sign,
awning, canopy or advertising, or fails to remove any such item(s) at the
expiration or earlier termination of this Lease, Landlord may have such item(s)
removed and destroyed and may repair any damage to the Premises at Tenant's
expense. All removal and repair costs incurred by Landlord pursuant to the
foregoing provisions of this Section 6.4 shall bear interest until paid at the
Default Interest Rate specified in Section 1.9 of the Summary. Landlord is
expressly and irrevocably authorized to destroy any sign, awning, canopy or
advertising, removed by Landlord pursuant to this Section, without liability to
Tenant, and Landlord shall not have the right to store such items and charge
Tenant for the costs of such storage. Prior to exercising its rights against
Tenant for a breach by Tenant of its obligations under this Section, Landlord
shall provide Tenant with the notice and opportunity to cure set forth in
Section 22.1(b) hereof.

         (b) Tenant shall be permitted, at Tenant's sole cost and expense (other
than with respect to the costs which Landlord has agreed to pay for the
directional monument sign as set forth below) and after satisfying all
conditions precedent to the installation of the same set forth below in this
subparagraph, to install and maintain during the Term, all in accordance with
the terms and provisions of this Lease, one (1) identification sign or panel on
the pylon sign for the Project, one (1) sign on the Building, and one (1)
directional monument sign (such signs are herein referred to collectively as
"TENANT'S SIGN") as reflected on Exhibit G attached hereto. Tenant's Sign shall
be illuminated, if Tenant desires, at Tenant's expense, and shall contain, at
Tenant's expense, Tenant's logo in the color selected by Tenant. The size,
color, illumination, type, design, quality, construction and location of
Tenant's Sign shall comply in all respects with all applicable Laws and with
Exhibit G. Tenant may, at its expense and subject to the applicable terms,
conditions and provisions of the Lease, all Laws, and any matters of record,
increase the size of the directional monument sign. Landlord's approval of
Tenant's Sign and any plans and specifications related to the installation of
Tenant's Sign shall not be unreasonably withheld, conditioned or delayed.
Landlord's approval of Tenant's Sign and any plans and specifications related to
the installation of Tenant's Sign shall create no responsibility or liability on
the part of Landlord for the completeness, design or sufficiency of Tenant's
Sign or such plans and specifications, or the compliance of the same with any
Laws applicable thereto. Prior to installing Tenant's Sign, Tenant must satisfy
the following conditions precedent: (a) Tenant shall have obtained the written
approval of Landlord such approval not to be unreasonably withheld or delayed;
(b) Tenant shall have obtained and be maintaining all permits and/or approvals
required by applicable Laws with respect to the installation and maintenance of
Tenant's Sign and shall have provided Landlord with sufficient evidence of the
existence of such permits and/or approvals and that the installation of Tenant's
Sign planned by Tenant will comply in all respects with all applicable Laws; and
(c) Tenant shall have furnished Landlord, in the form and content required by
Section 20 of this Lease, with evidence of the insurance that Tenant is
obligated to furnish to Landlord pursuant to Section 20 of this Lease. Tenant
shall promptly pay to Tenant's contractors, when due, the cost of all work
performed in connection with the installation of, and any removal of, Tenant's
Sign and, upon completion of such work, deliver to Landlord evidence of payment
and waivers of all liens for labor, services or materials. Tenant shall, at its
risk and at its sole cost and expense and within thirty (30) days after Tenant's
receipt of Landlord's written request for such removal, remove Tenant's Sign
from the Project following the occurrence of any of the following events and
Tenant's receipt of Landlord's written request for such removal: (1) a proper
termination of Tenant's right to possess all or any portion of the Premises; (2)
Tenant assigns any of its interest in this Lease or

                                      -9-
<PAGE>   13

sublets any portion of the Premises (other than to a Permitted Transferee [as
defined in Section 6.9 below]) in contravention of this Lease; (3) the
expiration of the Term; or (4) a proper termination of this Lease. After any
removal of Tenant's Sign required by the preceding sentence, (y) Tenant shall
have no further signage rights at the Building notwithstanding anything to the
contrary contained in this Section 6.4, and (z) if such removal is not done by
Tenant or a contractor of Tenant within such required period of time, then
Landlord may, at Tenant's sole cost and expense, dispose of Tenant's Sign in any
manner Landlord deems appropriate. Prior to any removal of Tenant's Sign by or
on behalf of Tenant (but excluding any removal of Tenant's Sign by Landlord or
its contractor), Tenant shall (i) obtain Landlord's written approval to the
plans related to the same (Landlord's approval of such plans shall create no
responsibility or liability on the part of Landlord for the completeness, design
or sufficiency of such plans), (ii) obtain and maintain all permits and/or
approvals required by applicable Laws with respect to the removal of Tenant's
Sign and provide Landlord with sufficient evidence of the existence of such
permits and/or approvals and that the removal of Tenant's Sign planned by Tenant
will comply in all respects with all Laws applicable thereto, and (iii) furnish
Landlord with the written evidence of insurance that Tenant is obligated to
furnish to Landlord pursuant to Section 20 of this Lease. Tenant shall repair
all damage caused by the installation, maintenance, or removal of Tenant's Sign
and restore the Building to its condition existing before the installation of
Tenant's Sign. If Tenant fails to satisfy any of Tenant's obligations under this
Section 6.4, Landlord may, without compensation to Tenant, use Tenant's Sign
after removing Tenant's name and/or logo therefrom or, at Tenant's sole cost and
expense, remove Tenant's Sign and perform the related restoration and/or repair
work and dispose of Tenant's Sign in any manner Landlord deems appropriate.
Tenant shall protect, defend, indemnify and hold harmless Landlord and all
Landlord Indemnified Parties (as defined in Section 8 below) from all Claims (as
defined in Section 6.5 below) resulting from and/or arising in connection with
or related to the construction, installation, maintenance, use, or removal of
Tenant's Sign by Tenant, its agents or contractors, except to the extent the
Claim in question was caused by Landlord's or its agents' or contractors' gross
negligence or willful misconduct. The rights granted to Tenant under this
Section 6.4 may not be assigned to any party other than a Permitted Transferee.
As used in this Section 6.4, the term "Tenant" shall include any Permitted
Transferee following an assignment of this Lease in its entirety from Tenant to
such Permitted Transferee.

         (c) Landlord shall not name the Building or the Project, without the
prior written consent of Tenant, not to be unreasonably withheld, and Landlord
shall not grant the right to place an exterior sign on the Building or a pylon,
monument or other exterior sign within the Project to any company listed on
Rider A attached hereto.

6.5      HAZARDOUS MATERIALS.

         (a)      Tenant shall at its sole cost and expense, (i) obtain and
maintain in full force and effect all Environmental Permits (as defined below)
that may be required from time to time under any Environmental Laws applicable
to Tenant's use and occupancy of the Premises or Tenant's use of the Satellite
Dish Area (as defined in the Exhibit E attached hereto), and/or the Generator
Pad (as defined in the Exhibit J attached hereto), and (ii) be and remain in
compliance with all terms and conditions of all such Environmental Permits and
with all Environmental Laws applicable to Tenant or the Premises. As used in
this Lease, the term "ENVIRONMENTAL LAW" means any present or future federal,
state, local or foreign statutory or common law, or any regulation, ordinance,
code, plan, order, permit, grant, franchise, concession, restriction or
agreement issued, entered, promulgated or approved thereunder, relating to (A)
the environment, human health or safety, including, without limitation,
emissions, discharges, releases or threatened releases of Hazardous Materials
into the environment (including, without limitation, air, surface water,
groundwater or land), or (B) the manufacture, generation, refining, processing,
distribution, use, sale, treatment, receipt, storage, disposal, transport,
arranging for transport, or handling of Hazardous Materials. "ENVIRONMENTAL
PERMITS" means, collectively, any and all permits, consents, licenses, approvals
and registrations of any nature at any time required pursuant to, or in order to
comply with, any Environmental Law, except for ordinary and general office
supplies, such as copier toner, liquid paper, glue, ink, customary cleaning
materials and materials required for cleaning and maintaining computer and
telecommunications equipment and batteries for Tenant's UPS system and fuel
tanks for Tenant's generator, if any. Tenant agrees not to cause or permit any
Hazardous Materials to be brought upon, stored, used, handled, generated,
released or disposed of on, in, under or about the Premises, the Satellite Dish
Area and/or the Generator Pad by Tenant, its agents, employees, subtenants,
assignees, licensees, contractors or invitees (collectively, "TENANT'S
PARTIES"), without the prior written consent of Landlord, which consent Landlord
may withhold in its sole and absolute discretion. Upon the expiration or earlier
termination of this Lease or any termination of Tenant's right to possess the
Premises, Tenant agrees to promptly remove from the Premises and/or the Project,
at its sole cost and expense, any and all Hazardous Materials, including any
equipment or systems containing Hazardous Materials, then present in, on,

                                      -10-
<PAGE>   14

under or about the Premises and/or the Project which were installed, brought
upon, stored, used, generated or released upon, in, under or about the Premises
and/or the Project by Tenant or any of Tenant's Parties. To the fullest extent
permitted by law, Tenant agrees to promptly indemnify, protect, defend and hold
harmless Landlord and Landlord's partners, and their respective partners,
members, managers, shareholders, officers, directors, employees, Affiliates,
mortgagees, successors and assigns (collectively, "LANDLORD INDEMNIFIED
PARTIES") from and against any and all claims, damages, judgments, suits, causes
of action, losses, liabilities, penalties, fines, expenses and costs (including,
without limitation, clean-up, removal, remediation and restoration costs, sums
paid in settlement of claims, reasonable attorneys' fees, and reasonable
consultant fees and court costs, but excluding indirect or consequential
damages) which arise or result from (1) the presence of Hazardous Materials in,
on, under or about the Premises and/or the Project if such Hazardous Materials
were installed, brought upon, stored, used, generated or released upon, in,
under or about the Premises and/or the Project by Tenant or any of Tenant's
Parties, and/or (2) Tenant's breach of any of the provisions of this Section
6.5. Tenant acknowledges that Tenant has inspected the Premises and/or the
Project and has thoroughly reviewed each of the environmental reports, if any,
supplied by Landlord to Tenant with respect to the Project and/or the Premises,
and that, except as provided in Section 6.5(b) below, Landlord makes no
representations or warranties of any kind or nature with respect to the
environmental condition of the Premises and/or the Project. As used in this
Lease, the term "HAZARDOUS MATERIALS" shall mean and include any hazardous or
toxic materials, substances or wastes as now or hereafter designated under any
law, statute, ordinance, rule, regulation, order or ruling of any agency of the
State, the United States Government or any other Governmental Authority,
including, without limitation, asbestos, petroleum, petroleum hydrocarbons and
petroleum based products, urea formaldehyde foam insulation, polychlorinated
biphenyls, and freon and other chlorofluorocarbons.

         (b) Landlord hereby represents and warrants to Tenant that the Premises
are free of any Hazardous Materials (including, without limitation asbestos) as
of the Commencement Date and that Landlord has not received written notice from
any Governmental Authority since Landlord acquired the Project of any existing
or threatened violation of any Environmental Law relating to the Premises.

         (c) In no event will Tenant have any liability or obligation under this
Lease or with respect to the Premises for Hazardous Materials existing in, on,
under or about the Premises on or prior to the Commencement Date or any
violation of Environmental Laws prior to or existing on the Commencement Date
and no costs or charges for any such violations or any presence of Hazardous
Materials shall be included in Tenant's Expenses. Landlord agrees to promptly
indemnify, protect, defend and hold harmless Tenant and Tenant's officers,
directors, employees, and Affiliates and their respective officers, directors,
employees, agents, mortgagees, successors and assigns (collectively, "TENANT
INDEMNIFIED PARTIES") from and against any and all claims, damages, judgments,
suits, causes of action, losses, liabilities, penalties, fines, expenses and
costs (including, without limitation, clean-up, removal, remediation and
restoration costs, sums paid in settlement of claims, reasonable attorneys' fees
and reasonable consultant fees and court costs) which arise or result from (1)
the presence of Hazardous Materials in, on, under or about the Premises and/or
the Project if such Hazardous Materials were installed, brought upon, stored,
used, generated or released upon, in, under or about the Premises and/or the
Project on or before the Commencement Date or by any parties other than Tenant
or any party acting on behalf of Tenant or pursuant to the rights granted to
Tenant hereunder.

         (d) The provisions of this Section 6.5 will survive the expiration or
earlier termination of this Lease.

6.6      CLEANING, REFUSE AND SEWAGE. Tenant agrees not to keep any trash,
garbage, waste or other refuse at the Premises and/or the Project except in
sanitary containers and agrees to regularly and frequently clean the Premises
and remove any and all trash, garbage, waste or refuse from the Premises. Tenant
shall keep all containers or other equipment used for storage of such materials
in a clean and sanitary condition. Tenant shall, at Tenant's sole cost and
expense, properly dispose of all trash, garbage, waste and refuse and shall not
use the existing sewage disposal system for the disposal of anything except
sanitary sewage. Tenant shall contract directly for all trash disposal services
at Tenant's sole cost and expense. Tenant expressly acknowledges that pursuant
to the terms of this Lease, Landlord shall provide no cleaning or trash removal
services.

6.7      LANDLORD'S RIGHTS REGARDING THE BUILDING AND THE PROJECT. So long as
such construction does not (i) materially and adversely affect Tenant's use and
occupancy of the Premises or Tenant's use of the Satellite Dish Area, the
Generator Pad, or any facilities of Tenant using, constituting or dependent upon
any portion of the Building not included within the Premises or any Common
Areas, as specified in this Lease, (ii) materially and

                                      -11-
<PAGE>   15

adversely affect Tenant's use of the Exclusive Parking Area, to the extent of
Tenant's right therein under this Lease, the Common Parking Area, (iii) prevent
Tenant's access to the Premises, or (iv) otherwise materially and adversely
diminish Tenant's rights under this Lease, Landlord shall have the right, from
time to time:

         (a) to make changes to and/or to reconfigure the Building or the
Project and the Common Areas, including, without limitation, changes in the
location, size, shape, and appearance thereof, including but not limited to the
lobbies, windows, stairways, air shafts, elevators, restrooms, driveways,
entrances, parking spaces, parking areas, loading and unloading areas, ingress,
egress, direction of traffic, decorative walls, landscaped areas and walkways;

         (b) to temporarily close or deny access to any part of the Common Areas
for maintenance purposes or for safety reasons;

         (c) to designate other land and improvements outside, but contiguous
to, the boundaries of the Building or the Project to be a part of the Common
Areas, provided that such other land and improvements have a reasonable and
functional relationship to the Building or the Project;

         (d) to add additional buildings, improvements and leasable areas to the
Project and/or the Common Areas; and

         (e) to temporarily close a portion of Common Areas to such extent
reasonably necessary, in the opinion of Landlord's counsel, to prevent a
dedication thereof or the acquisition of any rights therein by any person or by
the public.

In connection with any changes or reconfigurations described in Section 6.7(a)
above, Landlord shall provide Tenant with advance written notice thereof if such
changes or reconfigurations materially impact the Premises or Tenant's use of
the Premises and shall use commercially reasonable efforts to minimize the
disruption caused to Tenant's use and occupancy of the Premises and its business
conducted in the Premises.

6.8      PARKING.

         (a)      Tenant and any Permitted Transferee and its and such Permitted
Transferee's officers (if any), employees, licensees and visitors may use the
uncovered parking area identified on the Exhibit B-1 attached hereto (such
uncovered parking area is herein called the "Common Parking Area") for temporary
parking of their motor vehicles. Such use will begin on the Premises Delivery
Date and shall be (i) in common with other tenants of the Project and such
tenants' officers, employees, licensees and visitors, and (ii) subject to such
reasonable rules, regulations and restrictions as from time to time may be
imposed by Landlord (by written notice to Tenant) in connection therewith
including, without limitation, the right of Landlord to (1) designate, except
with respect to the Exclusive Parking Area (as defined in Section 6.8(b) below),
a particular area or areas within the Common Parking Area to be used for such
parking, and (2) reserve parking spaces in the Common Parking Area (other than
any parking spaces located in the Exclusive Parking Area) for the exclusive use
of other tenants of the Project and such tenants' officers, employees, licensees
and/or visitors. Tenant will furnish Landlord upon request a complete list of
license numbers of all automobiles operated by Tenant, its employees or
licensees and using the Common Parking Area on a regular basis. Neither Landlord
nor any parking operator shall have any liability or responsibility to Tenant or
any party parking in the Common Parking Area and/or the Exclusive Parking Area
for any loss or damage that may be occasioned by or may arise out of such
parking, including, but not limited to, loss of property or damage or injury to
person or property from any cause whatsoever, and Tenant hereby waives any and
all claims of any kind or nature against Landlord by reason of occurrences in
the Common Parking Area, the Exclusive Parking Area, and the driveway exits and
entrances thereto unless caused by the gross negligence or willful misconduct of
Landlord.

         (b)      Parking in the Common Parking Area will be allocated by
Landlord to Tenant on a first come - first served basis in an amount equal to
eight (8) spaces per one thousand (1,000) rentable square feet of the Premises
(the "INITIAL PARKING RATIO"). Initially, therefore, Landlord will allocate to
Tenant five hundred and sixty one (561) non-reserved, non-exclusive and
non-covered parking spaces (the "INITIALLY ALLOCATED PARKING SPACES") in the
Common Parking Area plus twenty-five (25) parking spaces in the Exclusive
Parking Area. There will be no charge during the Term for the Initially
Allocated Parking Spaces. At such time as the net rentable square footage of the
Premises increases or decreases, the number of Initially Allocated Parking
Spaces shall be increased or

                                      -12-
<PAGE>   16

decreased, as applicable, based on the Initial Parking Ratio (of any increase or
decrease 4.167% shall be in spaces in the Exclusive Parking Area (rounded to the
nearest whole number) and the remainder shall be non-reserved, non-exclusive and
non-covered parking spaces). Subject to the allocation provided above, all
parking is subject to space availability and Landlord shall designate the
location of all reserved parking spaces for other tenants or parties; provided,
Landlord shall not designate any portion of the area identified on Exhibit B-3
as reserved parking spaces for other tenants or parties. Additionally, Tenant
and its officers and employees shall have the exclusive right to use twenty-five
(25) parking spaces located within the area (the "EXCLUSIVE PARKING AREA")
identified on Exhibit B-2 as the "Exclusive Parking Area" for temporary parking
of their motor vehicles.

6.9      ABANDONMENT.

         (a)      Subject to the provisions of Section 6.9(b) below, except
following a Permitted Transfer (as hereinafter defined), if Tenant (or any
Transferee or Permitted Transferee) shall, after the Commencement Date,
"abandon" (as hereinafter defined) or fail to occupy all of the Premises for a
period of twelve (12) consecutive months, Landlord may, at its option, terminate
this Lease with respect to all of the Premises to the extent the same has been
abandoned (as hereinafter defined) or is no longer occupied. Such termination of
this Lease shall be done by delivering written notice of such termination to
Tenant prior to the end of any such abandonment (as hereinafter defined) or
failure to occupy the Premises, and such written notice of termination shall
specify the date or dates on which such termination shall be effective. Upon
such termination by Landlord, Tenant shall promptly pay or perform any
obligations which have accrued prior to such termination date, including the
payment of any rent hereunder, and subject to such payment and performance, this
Lease shall be terminated, and Tenant have no obligation to pay any future rent
hereunder. As used in this Lease, the term "PERMITTED TRANSFER" shall mean
either (1) a Transfer (as defined in Section 14.2 below) after Tenant's receipt
of Landlord's prior written consent thereto, or (2) a Permitted Transfer Without
Landlord Consent (as defined in Section 14.6 below), and the term "PERMITTED
TRANSFEREE" shall mean any assignee or sublessee in connection with a Permitted
Transfer. Landlord may re-enter the Premises for purposes of marketing the same
and making the same ready for a new tenant at any time after abandonment or
failure to occupy, but Landlord shall in no event be deemed to have terminated
this Lease by taking any such actions. If Tenant (or any Transferee or Permitted
Transferee) shall (a) after the Commencement Date, abandon or fail to occupy the
entire Premises for a period of twelve (12) consecutive months, (b) surrender
(whether at the end of the Term or otherwise) the entire Premises, or (c) be
dispossessed by process of law, or otherwise, of all of the Premises, then any
personal property belonging to Tenant and left in the Premises shall, at
Landlord's option, be deemed abandoned. Such personal property may be
appropriated, sold, destroyed, or otherwise disposed of by Landlord without
notice to Tenant and without any obligation to account for such property. As
used in this Lease, the terms "ABANDON," "ABANDONED" AND "ABANDONMENT" shall
mean to conduct, during the normal business hours of the Building, Tenant's
activities within the Premises such that the Premises are not being occupied by
at least one (1) person during such business hours. In addition, Tenant shall be
deemed to have abandoned one or more portion(s) of the Premises in the event
that more than ninety percent (90%) of Tenant's furniture, fixtures and/or
equipment within the Premises is removed by or on behalf of Tenant prior to the
expiration or earlier termination of this Lease. The provisions of this Section
6.9 shall survive the expiration or earlier termination of this Lease. Tenant
shall have thirty (30) days after any termination of this Lease pursuant to this
Section to remove its personal property from the Premises, which removal shall
be subject to the other provisions of this Lease. Landlord is expressly and
irrevocably authorized to destroy any personal property not removed by Tenant
from the Premises upon the termination or expiration of this Lease, without
liability to Tenant, and Landlord shall not have the right to store such items
and charge Tenant for the costs of such storage.

         (b)      If Tenant desires to abandon the Premises or any portion
thereof, Tenant shall deliver a notice to Landlord specifying that Tenant
desires to do so (each a "RECAPTURE NOTICE"). Each Recapture Notice relating to
a portion of the Premises must specify the portion of the Premises to be
abandoned (the "RECAPTURE PREMISES") and must also specify the date the
abandonment would become effective (the "ABANDONMENT DATE"). Landlord shall have
a period of thirty (30) days from receipt of each Recapture Notice to give
Tenant notice stating that Landlord elects to:

         (i)      if the Recapture Notice states that Tenant proposes to abandon
all of the Premises, terminate this Lease and recapture the Premises;

         (ii)     if the Recapture Notice states that Tenant proposes to abandon
less than all of the Premises, terminate this Lease as to the Recapture Premises
and recapture the Recapture Premises (in which event this Lease shall remain in
full force and effect as to the remainder of the Premises); or

                                      -13-
<PAGE>   17

         (iii)    waive Landlord's right under this paragraph to recapture the
Premises or the Recapture Premises, as identified in the Recapture Notice, for a
period of 210 days from the date the Recapture Notice is delivered to Landlord.

If Landlord does not deliver notice to Tenant within the thirty (30) day period
electing to exercise Landlord's right of recapture, Landlord is deemed to waive
its rights of recapture with respect to such Recapture Notice (but not with
respect to any future Recapture Notices). If Landlord elects to exercise its
right to recapture the Premises or the Recapture Premises, as applicable, (1)
the recapture is effective as of the later of (x) the last day of the calendar
month in which the 60th day after the date of Landlord's notice falls or (y) the
Abandonment Date, and (2) Landlord shall then prepare, execute, and deliver to
Tenant, and Tenant shall execute and return to Landlord, an appropriate
amendment or termination of this Lease.

Any waiver or deemed waiver of Landlord's right of recapture is effective only
for 210 days after the date of the Recapture Notice and only with respect to the
Premises or portion thereof proposed to be abandoned in the Recapture Notice. If
Tenant later proposes to abandon the Premises or any portion thereof, Tenant
must give another Recapture Notice and trigger Landlord's right of recapture
under this paragraph.

The parties acknowledge that the provisions of this paragraph shall not permit
or authorize a Transfer (as defined in Section 14.2 hereof) by Tenant, and any
Transfer by Tenant shall be governed by the provisions of Article 14 hereof.

6.10 AS IS. TENANT ACKNOWLEDGES AND AGREES THAT, EXCEPT TO THE EXTENT
SPECIFICALLY SET FORTH IN THIS LEASE, LANDLORD HAS NOT MADE, DOES NOT MAKE AND
SPECIFICALLY NEGATES AND DISCLAIMS (AND TENANT HAS NOT RELIED ON) ANY
REPRESENTATIONS, WARRANTIES, PROMISES, COVENANTS, AGREEMENTS OR GUARANTEES,
EXPRESS OR IMPLIED, OF ANY KIND OR CHARACTER WHATSOEVER CONCERNING OR WITH
RESPECT TO (I) THE VALUE, NATURE, QUALITY OR CONDITION (INCLUDING, WITHOUT
LIMITATION, THE ENVIRONMENTAL CONDITION) OF THE PREMISES; (II) THE SUITABILITY
OF THE PREMISES FOR ANY AND ALL ACTIVITIES AND USES WHICH TENANT MAY CONDUCT
THEREON; (III) THE COMPLIANCE OF THE PREMISES WITH ANY LAWS; (IV) THE
HABITABILITY, MERCHANTABILITY, MARKETABILITY, PROFITABILITY OR FITNESS FOR A
PARTICULAR PURPOSE OF THE PREMISES; (V) THE MANNER OR QUALITY OF THE
CONSTRUCTION OR MATERIALS INCORPORATED INTO THE PREMISES; (VI) THE MANNER,
QUALITY, STATE OF REPAIR OR LACK OF REPAIR OF THE PREMISES; (VII) THE
LAWFULNESS, EITHER NOW OR IN THE FUTURE, OF THE USE OF THE PREMISES FOR THE
PERMITTED USE SET FORTH IN SECTION 1.8 OF THE SUMMARY; OR (VIII) ANY OTHER
MATTER WITH RESPECT TO THE PREMISES, IT BEING AGREED THAT ALL RISKS INCIDENT TO
ALL OF THESE MATTERS ARE TO BE BORNE BY TENANT. TENANT FURTHER ACKNOWLEDGES AND
AGREES THAT TENANT HAS INSPECTED THE PREMISES AND TENANT HAS RELIED AND SHALL
RELY SOLELY ON ITS OWN INVESTIGATION OF THE PREMISES AND NOT ON ANY INFORMATION
PROVIDED OR TO BE PROVIDED BY LANDLORD, OTHER THAN EXPRESS REPRESENTATIONS BY
LANDLORD, LANDLORD'S CONTRACTOR, AND/OR LANDLORD'S BROKER CONTAINED IN WRITTEN
CERTIFICATES PROVIDED TO TENANT BY LANDLORD, LANDLORD'S CONTRACTOR AND/OR
LANDLORD'S BROKER. TENANT FURTHER ACKNOWLEDGES AND AGREES THAT ANY INFORMATION
PROVIDED OR TO BE PROVIDED BY OR ON BEHALF OF LANDLORD WITH RESPECT TO THE
PREMISES, WAS OBTAINED FROM A VARIETY OF SOURCES AND THAT LANDLORD HAS NOT MADE
ANY INDEPENDENT INVESTIGATION OR VERIFICATION OF SUCH INFORMATION AND MAKES NO
REPRESENTATIONS AS TO THE ACCURACY OR COMPLETENESS OF SUCH INFORMATION. TENANT
FURTHER ACKNOWLEDGES AND AGREES THAT, EXCEPT TO THE EXTENT SPECIFICALLY SET
FORTH IN THIS LEASE, THE LEASING OF THE PREMISES AS PROVIDED FOR HEREIN IS MADE
ON AN "AS-IS" CONDITION AND BASIS WITH ALL FAULTS. IN THE EVENT OF ANY DEFECT OR
DEFICIENCY IN ANY NATURE IN THE PREMISES, WHETHER PATENT OR LATENT, LANDLORD
SHALL HAVE NO RESPONSIBILITY OR LIABILITY WITH RESPECT THERETO (EXCEPT AS
OTHERWISE EXPRESSLY PROVIDED IN THIS LEASE) OR FOR ANY INCIDENTAL OR
CONSEQUENTIAL DAMAGES ARISING THEREFROM. SUBJECT TO LANDLORD'S INDEMNITY
OBLIGATIONS SET FORTH HEREIN, TENANT AND ANYONE CLAIMING BY, THROUGH OR UNDER
TENANT HEREBY FULLY AND IRREVOCABLY RELEASES LANDLORD AND THE LANDLORD
INDEMNIFIED PARTIES FROM ANY AND ALL

                                      -14-
<PAGE>   18

DAMAGE TO PROPERTY AND INJURY TO PERSONS AND ALL OTHER CLAIMS THAT IT MAY NOW
HAVE OR HEREAFTER ACQUIRE AGAINST THEM ARISING FROM OR RELATED TO ANY
CONSTRUCTION DEFECTS, ERRORS, OMISSIONS OR OTHER CONDITIONS NOW OR HEREAFTER
AFFECTING THE PREMISES, INCLUDING, BUT NOT LIMITED TO, ENVIRONMENTAL MATTERS AND
HAZARDOUS MATERIALS, EXCEPT TO THE EXTENT THAT LANDLORD HAS, PURSUANT TO THE
TERMS OF THIS LEASE, EXPRESSLY ASSUMED AN OBLIGATION WITH RESPECT TO SUCH
CONDITIONS (INCLUDING, WITHOUT LIMITATION, LANDLORD'S OBLIGATIONS IN SECTIONS
6.5, 11.1(b), 18 AND 19). THIS RELEASE INCLUDES CLAIMS OF WHICH TENANT IS
PRESENTLY UNAWARE OR WHICH TENANT DOES NOT PRESENTLY SUSPECT TO EXIST IN ITS
FAVOR WHICH, IF KNOWN BY TENANT, WOULD MATERIALLY AFFECT TENANT'S RELEASE OF
LANDLORD AND THE LANDLORD INDEMNIFIED PARTIES.

6.11     BUILDING BASE COMPONENTS. Landlord represents and warrants that the
Base Building Components have been constructed in a good and workmanlike manner,
and that none of the same has been constructed in contravention of any existing
Laws (including, without limitation, any Environmental Laws and/or the ADA or
other Disability Laws). Landlord hereby agrees to defend and indemnify and hold
harmless Tenant, its Affiliates and their respective officers, directors,
employees, stockholders, agents and representatives against, and to hold them
harmless from, any loss, liability, claim, damage or expense (including
reasonable legal fees and expenses incurred therein or in enforcing this
indemnity), as incurred (payable upon written request), for or on account of or
arising from or in connection with or otherwise with respect to any inaccuracy
of the representations or warranties set forth in this Section 6.11.

7.       PAYMENTS AND NOTICES.

7.1      PAYMENTS. All Rent and other sums payable by Tenant to Landlord
hereunder shall be paid in lawful money of the United States of America, at c/o
Provident Realty Advisors, Inc., 17440 N. Dallas Parkway, Suite 230, Dallas,
Texas 75287, or to such other persons and/or at such other places as Landlord
may hereafter designate by notice to Tenant.

7.2      NOTICES. Any notice required or permitted to be given hereunder must be
in writing and may be given by personal delivery (including delivery by
nationally recognized overnight courier or express mailing service) or by
registered or certified mail, postage prepaid, return receipt requested,
addressed to Tenant at each of the addresses designated in Section 1.2 of the
Summary, or to Landlord at each of the addresses designated in Section 1.1 of
the Summary. Either party may, by written notice to the other, specify a
different address or addresses for notice purposes. Notices shall be deemed
received (a) on the date of delivery, with respect to personal deliveries made
prior to 5:00 p.m. Central Time, (b) the next business day, with respect to
personal deliveries made after 5:00 p.m. Central Time and overnight courier or
express mailing service deliveries or (c) three (3) business days after delivery
to the postal authorities, with respect to registered or certified mail.
Notwithstanding anything to the contrary herein, payments of Rent and additional
rent shall be deemed given when actually received by Landlord.

8.       BROKERS.

Each party represents and warrants to the other, that other than The Staubach
Company and Stream Realty Partners, L.P. (collectively, the "BROKERS"), no
broker, agent or finder (a) negotiated or was instrumental in negotiating or
consummating this Lease on its behalf, and (b) is or might be entitled to a
commission or compensation in connection with this Lease as a result of actions
by such party. Any broker, agent or finder of Tenant whom Tenant has failed to
disclose herein shall be paid by Tenant, and any Broker, agent or finder of
Landlord whom Landlord has failed to disclose herein shall be paid by Landlord.
Tenant shall indemnify, protect, defend and hold Landlord harmless from and
against any and all claims, damages, judgments, suits, causes of action, losses,
liabilities, penalties, fines, expenses and costs (including, without
limitation, sums paid in settlement of claims, reasonable attorneys' fees and
court costs) (collectively, "CLAIMS") resulting from any claims or demands made
upon Landlord for any commissions, fees or other compensation by any broker,
agent or salesman (other than the Brokers) in connection with this Lease
claiming by or through Tenant. Landlord shall indemnify, protect, defend and
hold Tenant harmless from and against any and all Claims resulting from any
claims or demands made upon Tenant for any commissions, fees or other
compensation by any broker, agent or salesman (including, without limitation,
the Brokers) in connection with this Lease claiming by or through Landlord. The
foregoing indemnities shall survive the

                                      -15-
<PAGE>   19

expiration or earlier termination of this Lease. Landlord shall pay each of the
Brokers pursuant to a separate written agreement with each of them.

9.       SURRENDER; HOLDING OVER.

9.1      SURRENDER OF PREMISES. Upon the expiration or sooner termination of
this Lease or any proper termination of Tenant's right to possess the Premises,
Tenant shall surrender all keys for the Premises to Landlord, and Tenant shall
deliver exclusive possession of the Premises to Landlord broom clean and in the
same condition and repair, reasonable wear and tear and damage due to fire or
other casualty excepted, as delivered to Tenant by Landlord on the Commencement
Date with all of Tenant's personal property (and those items, if any, of Tenant
Changes identified by Landlord pursuant to Section 12 below) removed therefrom
and all damage caused by such removal repaired, as required pursuant to Section
12 below. If, for any reason, Tenant fails to surrender the Premises on the
expiration or earlier termination of this Lease, with such removal and repair
obligations completed, then, in addition to Landlord's rights and remedies under
Section 12 and the other provisions of this Lease, Tenant shall indemnify,
protect, defend and hold Landlord harmless from and against any and all Claims
resulting from such failure to surrender, including, without limitation, any
Claims made by any succeeding tenant based thereon.

9.2      HOLDING OVER. If Tenant holds over after the expiration or earlier
termination of the Term or after any termination of Tenant's right to possess
the Premises, then, without waiver of any right on the part of Landlord as a
result of Tenant's failure to timely surrender possession of the Premises to
Landlord, Tenant shall become a tenant at sufferance only, upon the terms and
conditions set forth in this Lease so far as applicable (including Tenant's
obligation to pay all costs, expenses and any other additional rent under this
Lease), but at a monthly Rent equal to one hundred twenty-five percent (125%) of
the monthly Rent applicable to the Premises immediately prior to the date of
such expiration or earlier termination, increased as provided below. Acceptance
by Landlord of rent after any expiration or earlier termination of this Lease
shall not constitute a consent to a hold over hereunder or result in an
extension of this Lease. Tenant shall pay an entire month's monthly Rent
calculated in accordance with this Section 9.2 for any portion of a month it
holds over and remains in possession of the Premises pursuant to this Section
9.2.

10.      TAXES.

10.1     RENT TAXES. In addition to the payment required to be made by Tenant
under Section 4 hereof, Tenant agrees to pay all other general and special
taxes, assessments (including, without limitation, real estate taxes and
assessments), liens, bond obligations, license fees or taxes, water and sewer
rents and charges, utilities and communications taxes and charges, any similar
impositions in-lieu of other impositions now or previously within the definition
of real property taxes or assessments, all other government charges, general and
special, ordinary and extraordinary, foreseen and unforeseen, which are, at any
time, prior to or during the Term, imposed upon or assessed against (a) any Rent
or other sum payable hereunder, (b) this Lease, the leasehold estate created
hereby, or (c) the ownership, operation, occupancy, leasing, use or possession
of the Premises (including, without limitation, any gross receipts tax, gross
rental tax, sales tax, use tax or excise tax) and any and all assessments under
any covenants, conditions and restrictions affecting the Premises (collectively
"RENT TAXES") which may be now or hereafter levied or assessed against the
Premises or the Project (as the case may be), applicable to the period from the
Commencement Date until the expiration or sooner termination of this Lease.
Notwithstanding the foregoing, there shall be excluded from Rent Taxes all
excess profits taxes, franchise taxes, gift taxes, capital stock taxes,
inheritance and succession taxes, estate taxes, federal, state and local income
taxes, change in ownership, taxes or assessments and other taxes to the extent
applicable to Landlord's general or net income (as opposed to rents, receipts,
sales, excise, use or income attributable to operations at the Premises).

If at any time during the Term under the laws of the United States, or the
state, county, municipality, or any political subdivision thereof in which the
Premises is located, a tax or excise on rent or any other tax however described
is levied or assessed by any such political body against Landlord on account of
rent payable to Landlord hereunder or any tax based on or measured by
expenditures made by Tenant on behalf of Landlord, such tax or excise shall be
considered "Rent Taxes" for purposes of this Section 10. 1, and shall be payable
in full by Tenant. Such taxes or excises shall be payable within thirty (30)
days after Tenant's receipt of the tax bill therefor from Landlord.

10.2     PERSONAL PROPERTY TAXES. Tenant shall be liable for, and shall pay
before delinquency, all taxes and assessments, real and personal (but only to
the extent not included in Project Expenses or Rent Taxes), levied

                                      -16-
<PAGE>   20

against (a) any personal property or trade fixtures placed by Tenant in or about
the Premises (including any increase in the assessed value of the Premises based
upon the value of any such personal property or trade fixtures); and (b) any
tenant improvements or alterations (including Tenant Changes) in or about the
Premises and/or the Building (whether installed and/or paid for by Landlord or
Tenant). If any such taxes or assessments are levied against Landlord or
Landlord's property, Landlord may, after written notice to Tenant (and under
proper protest if requested by Tenant) pay such taxes and assessments, and
Tenant shall reimburse Landlord therefor within thirty (30) days after demand by
Landlord; provided, however, Tenant, at its sole cost and expense, shall have
the right, with Landlord's cooperation, to bring suit in any court of competent
jurisdiction to recover the amount of any such taxes and assessments so paid
under protest.

10.3     MUNICIPAL INCENTIVES. Landlord has made application for tax and/or
other abatements and/or incentives for the Project with the city of North
Richland Hills, and Landlord shall diligently pursue such application until such
time as the city of North Richland Hills approves or disapproves such
application or Landlord determines, in the exercise of its reasonable business
judgement, that it is not prudent to do so. Any and all incentives, abatements,
and benefits received prior to and/or following the Commencement Date and
applicable to the Term shall be included in the determination of Project
Expenses so that the Project Expenses are effectively reduced by the amount of
the savings achieved thereby. Landlord makes no (and hereby disclaims any)
representation, warranty, covenant, assurance or other statement with respect to
whether any such incentives shall be obtained, and Tenant acknowledges that it
is not relying on any such representation, warranty, covenant, assurance or
other statement by or on behalf of Landlord. The failure of Landlord to obtain
any tax and/or other abatements and/or incentives for the Project shall have no
affect on the obligations of Tenant hereunder.

11.      REPAIRS.

11.1     LANDLORD'S REPAIR RIGHTS AND OBLIGATIONS.

         (a)      If Tenant fails to promptly perform Tenant's obligations under
Section 11.2 below, or under any other provision of this Lease, then Landlord
shall have the option (but not the obligation) to enter upon the Premises after
ten (10) days' prior written notice to Tenant, or in the case of an emergency
immediately without prior notice, to perform such obligations on Tenant's behalf
necessary to return the Premises to good order, condition and repair, whereupon
the costs incurred by Landlord shall become due and payable to Landlord, upon
demand.

         (b)      Unless due to the acts or omissions of Tenant, its
contractors, agents, employees or invitees, and unless Tenant is otherwise
expressly obligated under the terms and conditions of this Lease, provided
Tenant is not in default hereunder beyond the expiration of any applicable grace
period, Landlord, at its sole cost and expense, subject to reimbursement if such
reimbursement is provided for in accordance with Section 4 of this Lease, shall
maintain and repair (i) the Project (excluding, however, those portions of the
Premises and/or Building to be maintained by Tenant as provided in Section 11.2
below), (ii) the foundation, the roof (excluding, however, any portions of the
roof actually used by Tenant within the Satellite Dish Area) and the structural
walls of the Building (the "BASE BUILDING COMPONENTS"), (iii) the Common Areas,
(iv) the Common Parking Area, and the Exclusive Parking Area, and (v) the water
and sewer systems of the Building. Except as provided in Section 18.1 below,
there shall be no abatement of Rent or liability of Tenant on account of any
injury or interference with Tenant's business with respect to any improvements,
alterations or repairs made by Landlord to the Project or any part thereof.

11.2     TENANT'S REPAIR OBLIGATIONS. Except to the extent of the Landlord's
obligations under, and as otherwise provided in, Sections 18 and 19 of this
Lease, Tenant shall at all times and at Tenant's sole cost and expense keep the
Premises, the Generator Pad, the Satellite Dish Area and all parts thereof and
all improvements thereon (including, without limitation, utility meters,
plumbing, pipes and conduits located within and serving the Premises, all
heating, ventilating and air conditioning systems located within or serving the
Premises, all fixtures, furniture and equipment, locks, closing devices,
security devices, windows, window sashes, casements and frames, floors and floor
coverings, shelving, restrooms, ceilings, interior walls, demising walls, doors,
electrical and lighting equipment, sprinkler systems, loading dock areas and
doors, signs and all other improvements [including any Tenant Changes or other
alterations, additions and other property and/or fixtures located within the
Premises]) in good condition and repair, reasonable wear and tear and damage due
to fire or other casualty excepted. Such maintenance and repairs shall be
performed with due diligence, lien-free and in a good and workmanlike manner.
Notwithstanding the foregoing, the parties hereto acknowledge and agree that
Tenant's obligations to maintain the plumbing, pipes and conduits (collectively,
"Plumbing") located within and serving the Premises do not extend to

                                      -17-
<PAGE>   21

any Plumbing that is not located within the Premises, even if such Plumbing
serves the Premises.

12.      ALTERATIONS.

12.1     LANDLORD "BUILDING STANDARD" IMPROVEMENTS.

         (a)      On or before June 28, 2000, Landlord will complete the
building shell improvements identified on the Exhibit K-1 attached hereto, and
Landlord shall furnish to Tenant a certificate from Landlord's contractor
confirming that the work set forth in such exhibit has been substantially
completed, or if not, the extent to which the work has not been substantially
completed. Further, on or before July 27, 2000, Landlord will complete the
external improvements identified on the Exhibit K-2 attached hereto, and
Landlord shall furnish to Tenant a certificate from Landlord's contractor
confirming that the work set forth in such exhibit has been substantially
completed, or if not, the extent to which the work has not been substantially
completed. To the extent a contractor's certificate to be provided by Landlord
to Tenant pursuant to this section indicates that any portion of the work
contemplated therein has not been substantially completed, Landlord shall
diligently pursue the completion thereof. If there is any dispute over whether
Landlord has substantially completed the work described in Exhibit K-1 and
Exhibit K-2, such dispute shall be submitted for resolution by binding
arbitration in accordance with the terms, conditions and provisions of the
Exhibit F attached to this Lease.

         (b)      If Landlord fails to substantially complete the improvements
referenced in Exhibit K-1 (including having received any required local
jurisdiction approval), defined as "LANDLORD'S INTERIOR SHELL IMPROVEMENTS", by
June 28, 2000 and such failure is due to the omission, delay, or default on the
part of Landlord and which is not due to Force Majeure Delays or delays caused
by the omission, delay or default on the part of Tenant, its agents, contractors
or any one acting on their behalf, then a Landlord Delay (as defined below) will
have occurred for each day the work remains incomplete. If Landlord fails to
substantially complete the balance of the shell improvements referenced in
Exhibit K-2 (including having received any required local jurisdiction
approval), defined as "LANDLORD'S EXTERIOR SHELL IMPROVEMENTS", by July 27, 2000
and such failure is due to the omission, delay, or default on the part of
Landlord and which is not due to Force Majeure Delays or delays caused by the
omission, delay or default on the part of Tenant, its agents, contractors or any
one acting on their behalf, then a Landlord Delay will have occurred for each
day the work remains incomplete. In the event of a Landlord Delay as described
above, Landlord shall not be liable for any costs, claims, damages, or
liabilities incurred by Tenant as a result thereof, and this Lease shall
nonetheless commence and continue in full force and effect; provided, however,
each of the Commencement Dates and the Rent Commencement Dates set forth in the
Summary of this Lease shall be deemed to be postponed by the number of days
elapsed from the date set forth above to the date of completion of the work
described above. Such postponement of rent and of the Rent Commencement Dates
shall constitute full settlement of all claims that Tenant might otherwise have
against Landlord by reason of completion of the work described above not
occurring by the dates described above. Provided, however, that if (a) the
Landlord has failed to complete the work described above within sixty (60) days
after the dates set forth above, (b) such failure is a result of Landlord Delay,
and (c) no Event of Default shall have occurred and is continuing, Tenant shall
have the right, as its sole and exclusive remedy, exercisable by written notice
to Landlord within ten (10) days after the expiration of such sixty (60) days
period, to terminate this Lease, and if such right is exercised, this Lease and
the obligations of the parties hereunder shall terminate, except for any
obligations of Tenant which have accrued prior to such termination date and any
provision hereof which expressly survives the expiration or earlier termination
of this Lease. A "LANDLORD Delay" shall mean a delay in the completion of work
to be completed by Landlord due to the omission, delay, or default on the part
of Landlord and which is not due to Force Majeure Delays or delays caused by the
omission, delay or default on the part of Tenant, its agents, contractors or any
one acting on their behalf. If there is any dispute over whether Landlord has
substantially completed the work described in Exhibit K-1 and Exhibit K-2, such
dispute shall be submitted for resolution by binding arbitration in accordance
with the terms, conditions and provisions of the Exhibit F attached to this
Lease. If Tenant terminates this Lease pursuant to this Section, Tenant shall
indemnify, protect, defend and hold Landlord harmless from and against any and
all Claims resulting from any claims or demands made upon Landlord for any
commissions, fees or other compensation by The Staubach Company.

12.2     TENANT IMPROVEMENTS. On or before the dates set forth the Work Letter
attached hereto as Exhibit L, Tenant will complete the construction of the
Tenant Improvements, as more specifically set forth in Exhibit L attached
hereto.

                                      -18-
<PAGE>   22

12.3     TENANT'S EARLY ACCESS TO THE INITIAL PREMISES. As set forth in Section
2.0 of the Summary, Tenant shall have the right to enter the Initial Premises
and to authorize its employees, architects, space planners, consultants,
contractors, engineers, suppliers and other representatives (collectively,
"Tenant's Contractors") to do so prior to the Commencement Date. Tenant shall
protect, defend, indemnify and hold harmless Landlord and all Landlord
Indemnified Parties exempt and harmless from and against any and all costs,
expenses, claims, demands, judgements, losses, liabilities and causes of action
arising out of or in connection with work performed in any portion of the
initial Premises by or on behalf of Tenant or otherwise arising out of or
connected with the activities of Tenant or its agents, servants, officers,
employees, contractors, suppliers or workmen in or about any portion of the
Initial Premises, the Building and/or the Project, SPECIFICALLY INCLUDING,
WITHOUT LIMITATION, SUCH LIABILITIES, COSTS, DAMAGES, FEES AND EXPENSES ARISING
OUT OF OR CONNECTED WITH THE NEGLIGENCE OF LANDLORD OR ANY LANDLORD INDEMNIFIED
PARTIES, but excluding any such liabilities, costs, damages, fees and expenses
caused by or resulting from the sole or gross negligence or willful misconduct
of Landlord or any Landlord Indemnified Parties. Such entry by Tenant and
Tenant's Contractors pursuant to this Section shall be deemed to be under all of
the terms, covenants, provisions and conditions of this Lease except the
covenant to pay Rent.

12.4     TENANT CHANGES; CONDITIONS.

         (a)      Tenant shall not make any alterations, additions or
improvements to the Premises (collectively, "TENANT CHANGES," and individually,
a "TENANT CHANGE") unless Tenant first obtains Landlord's prior written approval
thereof, which approval Landlord shall not unreasonably withhold or delay;
provided, however, Landlord may withhold its consent, in its sole and absolute
discretion with respect to any such alterations, additions, improvements or
decorations to or affecting (i) the Base Building Components or any other
structural components, and/or utilities or systems of or serving the Premises or
any portion thereof, or (ii) any Common Areas. Landlord shall approve or
disapprove of any Tenant Change requiring Landlord's written consent thereto
prior to the construction thereof within ten (10) business days after Landlord's
receipt of the last of (A) Tenant's written request for Landlord's approval to a
Tenant Change and the plans, specifications and working drawings related to such
Tenant Change, and (B) such other information related to such Tenant Change as
Landlord may reasonably require in connection therewith within five (5) days
after its receipt of the materials identified in subpart (A). If Landlord fails
to approve or disapprove of any Tenant Change within the ten (10) business day
period identified in the immediately preceding sentence, and Landlord thereafter
fails to approve or disapprove of such Tenant Change within ten (10) business
days after its receipt of written notice of its failure to approve or disapprove
of such Tenant Change within such ten (10) business day period, Landlord shall
be deemed to have approved the applicable Tenant Change. If a Tenant Change (1)
does not affect (y) the Base Building Components or any other structural
components, and (z) utilities or systems of or serving the Premises or any
portion thereof, and (2) will cost less than $25,000.00, Tenant shall have the
right to make such Tenant Change without first obtaining Landlord's written
approval thereof and without the payment of any fee to Landlord in connection
therewith provided that (aa) Tenant provides Landlord with a written notice
describing in reasonable detail such Tenant Change, and (bb) on the date of
Landlord's receipt of such written notice no Event of Default has occurred and
is continuing or any event which with the giving of notice or the passage of
time, or both, would constitute an Event of Default. The preceding sentence
shall not excuse Tenant from performing such Tenant Change in accordance with
the requirements set forth in Sections 12.4(b) and 12.4(c) below and all other
applicable provisions of this Lease.

         (b)      All Tenant Changes shall be performed: (i) in accordance with
plans, specifications and working drawings approved by Landlord; (ii) lien-free
and in a good and workmanlike manner; (iii) in compliance with all Laws,
including, without limitation, the provisions of Title III of the ADA and all
other Disability Laws (as hereinafter defined); (iv) subject to such reasonable
rules and regulations as Landlord may from time to time designate, but in no
event shall Landlord be entitled to receive a fee for Landlord's approval of the
plans, specifications and/or working drawings relating to the applicable Tenant
Changes, unless otherwise agreed by Tenant in writing; and (v) in compliance
with the requirements of any insurance policy required to be maintained by
Tenant under this Lease. Tenant shall promptly pay when due all costs and
expenses of any Tenant Changes. Tenant Changes may be performed by a general
contractor, construction manager, subcontractors, architects and engineers of
Tenant's choice, subject to Landlord's approval which will not be unreasonably
withheld or delayed. As used in this Lease, the term "DISABILITY LAWS" shall
mean the provisions of (A) Tex. Rev. Civ. Stat. Ann. art 9102, as amended, (B)
the ADA, as amended, and (C) any other similar public accommodation Laws.

         (c)      Throughout the performance of the Tenant Changes, Tenant shall
obtain, or cause its contractors

                                      -19-
<PAGE>   23

to obtain, workers compensation insurance and commercial general liability
insurance in compliance with the provisions of Section 20 of this Lease.

12.5     REMOVAL. All Tenant Changes shall become the property of Landlord and
shall remain upon and be surrendered with the Premises at the end of the Term;
provided, however, Landlord may, in its written approval notice related to any
such Tenant Change, identify those items of such Tenant Change which Landlord
shall require Tenant to remove at the end of the Term. In no event shall Tenant
be required to remove any of the improvements existing in the Building as of the
date possession thereof is delivered to Tenant. If Landlord requires Tenant to
remove any such Tenant Changes as described above, Tenant shall, at its sole
cost, remove the identified Tenant Changes on or before the expiration or sooner
termination of this Lease and repair any damage to the Premises caused by such
removal. If Tenant fails to remove any such Tenant Changes in accordance with
this Section 12.5, Tenant shall pay to Landlord all of Landlord's reasonable
costs of such removal and repair.

12.6     REMOVAL OF PERSONAL PROPERTY. All articles of personal property owned
by Tenant or installed by Tenant at its expense on the Premises, including,
without limitation, computer and telecommunications equipment, Switch Gear,
Generator, Uninterruptible Power Supply, AC Power Distribution System, HVAC
Chiller Plant, HVAC Stand Alone Units, Facility Monitoring Systems and Fire
Suppression systems, business and trade fixtures, furniture and movable
partitions (collectively, "Tenant's Property") shall be, and remain, the
property of Tenant, together with all personal property owned by Tenant's
customers at any time located on the Premises ("Tenant's Customer's Property")
and shall be removed by Tenant from the Premises, at Tenant's sole cost and
expense, on or before the expiration or sooner termination of this Lease or any
termination of Tenant's right to possess the Premises. Tenant shall repair any
damage caused by such removal.

12.7     TENANT'S FAILURE TO REMOVE. If, prior to the date of the expiration or
sooner termination of this Lease or any termination of Tenant's right to possess
the Premises, Tenant fails to remove all of Tenant's Property and Tenant's
Customer's Property, or any items of Tenant Changes identified by Landlord for
removal pursuant to Section 12.5 above, Landlord may, (without liability to
Tenant for loss thereof), at Tenant's sole cost and in addition to Landlord's
other rights and remedies under this Lease, at law or in equity: (a) remove and
store such items in accordance with applicable Laws; and/or (b) upon ten (10)
days' prior notice to Tenant sell all or any such items at private or public
sale for such price as Landlord may obtain as permitted under applicable Laws.
Landlord shall apply the proceeds of any such sale to any amounts due to
Landlord under this Lease from Tenant (including Landlord's reasonable
attorneys' fees and other costs incurred in the removal, storage and/or sale of
such items), with any remainder to be paid to Tenant.

13.      LIENS.

Tenant shall not permit any mechanic's, materialmen's or other liens to be filed
against all or any part of the Premises, nor against Tenant's leasehold interest
in the Premises, by reason of or in connection with any repairs, alterations,
improvements or other work contracted for or undertaken by Tenant or any other
act or omission of Tenant or Tenant's agents, employees, contractors, licensees
or invitees. Tenant shall, at Landlord's request, provide Landlord with
enforceable, conditional and final lien releases (and other reasonable evidence
reasonably requested by Landlord to demonstrate protection from liens) from all
persons furnishing labor and/or materials with respect to the Premises. Landlord
shall have the right at all reasonable times to post on the Premises and record
any notices of non-responsibility which it deems necessary for protection from
such liens. If any such liens are filed, Tenant shall, at its sole cost, within
twenty (20) days after receipt of notice of the filing thereof, cause each such
lien to be released of record or bonded so that it no longer affects title to
the Premises. If Tenant fails to cause such lien to be so released or bonded
within such twenty (20) day period, Landlord may, without waiving its rights and
remedies based on such breach, and without releasing Tenant from any of its
obligations, cause such lien to be released by any means it shall deem proper,
including payment in satisfaction of the claim giving rise to such lien. Tenant
shall pay to Landlord within ten (10) business days after receipt of invoice
from Landlord, any sum paid by Landlord to remove such liens, together with
interest at the Default Interest Rate from the date of such payment by Landlord.

14.      ASSIGNMENT AND SUBLETTING.

14.1     RESTRICTION ON TRANSFER. Tenant shall not assign or encumber this Lease
in whole or in part, nor sublet all or any part of the Premises, without the
prior written consent of Landlord, which consent will not be unreasonably
withheld, delayed or conditioned. The consent by Landlord to any assignment,
encumbrance or subletting shall not

                                      -20-
<PAGE>   24

constitute a waiver of the necessity for such consent to any subsequent
assignment, encumbrance or subletting. This prohibition against assigning or
subletting shall be construed to include a prohibition against any assignment or
subletting by operation of law. Without limiting in any way Landlord's right to
withhold its consent on any reasonable grounds, it is agreed that Landlord will
not be acting unreasonably in refusing to consent to an assignment or sublease
if, in Landlord's reasonable opinion, (a) the proposed assignment or sublease
involves a change of use of the Premises from that specified herein that is
materially different from other uses of areas within the Project by
then-existing tenants, (b) the proposed assignee or subtenant is not, in
Landlord's reasonable opinion, of reputable or good character or, if Tenant is
to be released from its obligations hereunder, the proposed assignee or
subtenant does not have, in Landlord's reasonable opinion, a financial strength
equal to a tenant to whom Landlord would lease space in the Project, (c) a
Mortgagee (as defined in Section 18.1 below) or Ground Lessor (as defined in
Section 18.1 below) does not approve such assignment or sublease after being
requested to approve the same, or (d) in the case of a subletting, the
subletting shall not be expressly subject to all of the provisions of this Lease
and the obligations of Tenant hereunder (other than Tenant's obligation to pay
Rent and any other obligations under this Lease that are in no way applicable to
the proposed subleased premises) and shall not further provide that if Landlord
shall recover or come into possession of the Premises before the expiration of
this Lease, Landlord shall have the right to take over the sublease and to have
it become a direct lease with Landlord, in which case Landlord shall succeed to
all of the rights of Tenant, as sublessor, thereunder and that in such case
subtenant shall be bound to Landlord for the balance of the term of the Sublease
and shall attorn to and recognize Landlord as its landlord under the sublease
under all of the then executory terms of the sublease, except that Landlord will
not (i) be liable for any previous acts or omissions of Tenant, as sublessor,
(ii) be subject to any claims of subtenant not expressly set forth in the
sublease, (iii) be bound by any modification of the sublease for which Landlord
shall have not expressly consented, or (iv) be obligated to perform any repairs
or other work beyond Landlord's obligations under this Lease. For purposes of
the foregoing, Landlord and Tenant acknowledge and agree that if Tenant proposes
to sublease or assign all or part of the Premises to a call center operation,
Landlord may not withhold its consent to such sublease or assignment under
sub-clause (a) above. Tenant acknowledges and agrees (again without in any way
limiting Landlord's right to withhold its consent on reasonable grounds) that
Landlord may also withhold its consent to a Transfer based on any one or more of
the following: (1) Tenant's failure to satisfy its obligations in Section 14.2;
(2) at the time thereof an Event of Default (as defined in Section 22.1 below)
has occurred and is continuing or an event has occurred and is continuing which
with the giving of notice or the passage of time, or both, would constitute an
Event of Default; (3) unless Landlord receives reasonably adequate assurance
(for example, a security deposit) of the performance of all provisions of this
Lease regarding the removal of Tenant Changes (including any proposed Tenant
Changes), Tenant's Property and Tenant's Customer's Property from the Premises,
the portion(s) of the Premises subject to the proposed Transfer will, in
Landlord's reasonable judgement, cause the Premises or the portion(s) of the
Premises subject to the proposed Transfer to be unmarketable; (4) a lessor under
any ground or underlying lease covering the Project or any portion thereof has
not approved the proposed Transfer and Landlord has requested that such lessor
approve the same; (5) the fact that the Proposed Transferee is a governmental
entity; (6) the Proposed Transferee's primary business is prohibited by a
non-compete or similar provision of another lease of space at the Project; (7)
the Proposed Transferee is a competitor of Landlord; (8) the Proposed Transferee
is then, or has within six (6) months immediately preceding Tenant's written
request for Landlord's consent to such Transfer been, a person or entity with
whom Landlord is dealing or has dealt regarding the possibility of leasing space
in the Project and Landlord then has space Available For Rent (as defined in
Section 14.5 below) in the Project that is Comparable in Size (as defined in
Section 14.5 below) to the Premises or the applicable portion thereof to be
sublet; or (9) the fact that the instrument effecting the proposed Transfer is
not in form and content reasonably satisfactory to Landlord.

14.2     TRANSFER NOTICE. If Tenant desires to effect an assignment, encumbrance
or subletting of this Lease, the Premises, or any interest therein, in whole or
in part (a "TRANSFER"), then at least thirty (30) days prior to the date when
Tenant desires the Transfer to be effective (the "TRANSFER DATE"), Tenant agrees
to give Landlord a notice (the "TRANSFER NOTICE"), stating the name, address and
business of the proposed assignee, sublessee or other transferee (sometimes
referred to as a "PROPOSED TRANSFEREE"), reasonable information (including
references) concerning the character, ownership, and financial condition of the
Proposed Transferee, the Transfer Date, any ownership or commercial relationship
between Tenant and the Proposed Transferee, and the consideration and all other
material terms and conditions of the proposed Transfer, all in such detail as
Landlord may reasonably require, together with copies of the Proposed Transfer
documentation and the following information about the Proposed Transferee: (1)
such Proposed Transferee's proposed use of the Premises; (2) banking, financial,
and other credit information (including, without limitation, a current balance
sheet and income statement of the Proposed Transferee); and (3) such other
information as Landlord may reasonably request in writing within ten (10) days
after

                                      -21-
<PAGE>   25

its receipt of the Transfer Notice and the information described in clauses (1)
and (2) of this Section 14.2. If Tenant effects a Transfer or requests the
consent of Landlord to any Transfer (whether or not such Transfer is
consummated), then, upon demand, and as a condition precedent to Landlord's
consideration of the proposed assignment or sublease, Tenant shall reimburse
Landlord for its reasonable attorneys' fees and other expenses incurred in
connection with considering any request for its consent to a Transfer.

14.3     LANDLORD'S OPTIONS. Within ten (10) business of Landlord's receipt of
any Transfer Notice and all of the information and materials required by the
first sentence in Section 14.2 above (including, without limitation, any and all
additional information requested by Landlord concerning the proposed
Transferee's financial responsibility), Landlord will notify Tenant of its
election to do one of the following: (a) consent to the proposed Transfer
subject to such reasonable conditions as Landlord may impose in providing such
consent; (b) refuse such consent, which refusal shall be on reasonable grounds,
subject to the terms herein, or (c) terminate this Lease (or, as to a partial
subletting or assignment, terminate this Lease as to the portion of the Premises
proposed to be sublet or assigned if the term of any such sublease or partial
assignment is coterminous with the remaining term of this Lease), effective as
of the effective date of the Transfer Date, without the imposition of any
termination fee to Tenant. If in such notice Landlord elects to terminate this
Lease as to any portion of the Premises and Tenant does not rescind in writing
its request for Landlord's consent to the applicable Transfer within ten (10)
business days after its receipt of written notice of such termination, then (i)
this Lease shall cease for such portion of the Premises, (ii) Tenant shall pay
to Landlord all Rent accrued through the termination date relating to such
portion of the Premises covered by the proposed Transfer, and (iii) Landlord and
Tenant shall, within fifteen (15) days after Tenant's receipt of Landlord's
written notice of termination, enter into an agreement amending this Lease to
reflect such partial termination (including, without limitation, Tenant's
acknowledgment and agreement that Landlord may lease such portion of the
Premises to the prospective transferee [or to any other person] without
liability to Tenant).

14.4     ADDITIONAL CONDITIONS. A condition to Landlord's consent to any
Transfer of this Lease will be the delivery to Landlord of a true copy of the
fully executed instrument of assignment, sublease, transfer or hypothecation, in
form and substance reasonably satisfactory to Landlord, which instrument shall,
in the case of an assignment, include an express assumption by the assignee of
all of Tenant's obligations under this Lease. Except as otherwise provided in
this Section 14.4, Tenant agrees to pay to Landlord, as additional rent, all
sums and other consideration payable to and for the benefit of Tenant by the
assignee or sublessee in excess of the rent payable under this Lease for the
same period and portion of the Premises after deducting all reasonable
out-of-pocket, third party expenses incurred by Tenant in connection with such
subleasing or assignment, including, without limitation, any tenant
improvements, brokerage fees and marketing expenses, so long as such expenses
have been disclosed by Tenant to Landlord in connection with Tenant's request
for approval of such assignment or sublease (100% of such excess after such
deductions is herein referred to as "TRANSFER PROFITS"). No Transfer will
release Tenant of Tenant's obligations under this Lease or alter the primary
liability of Tenant to pay the Rent and to perform all other obligations to be
performed by Tenant hereunder. Landlord may require that any Transferee remit
directly to Landlord on a monthly basis, all monies due Tenant by said
Transferee (less any portion of the applicable Transfer Profits Tenant is then
entitled to receive pursuant to this Section 14.4), and each sublease shall
provide that if Landlord gives said sublessee written notice that Tenant is in
default under this Lease, said sublessee will thereafter make all payments due
under the sublease directly to or as directed by Landlord, which payments
(excluding any portion thereof comprising Transfer Profits which shall be
retained by Landlord) will be credited against any payments due under this
Lease. Tenant hereby irrevocably and unconditionally assigns to Landlord all
rents and other sums payable under any sublease of the Premises; provided,
however, that Landlord hereby grants Tenant a license to collect all such rents
and other sums so long as no Event of Default has occurred and is continuing and
to retain 50% of such Transfer Profits until the date on which an Event of
Default has occurred, after which date Tenant shall have no right to retain any
such Transfer Profits. This covenant and assignment shall run with the land and
shall bind Tenant and Tenant's heirs, executors, administrators, personal
representatives, successors and assigns. Any assignee or purchaser of Tenant's
interest in this Lease or any sublessee of all or any portion of the Premises
(each such assignee, purchaser or sublessee is herein referred to as a
"TRANSFEREE"), by occupying the Premises or any portion(s) thereof and/or
assuming Tenant's obligations hereunder, shall assume liability to Landlord for
all amounts paid to persons other than Landlord by such Transferee in connection
with any such assignment or sale of Tenant's interest in this Lease or
subletting of all or any portion of the Premises. No collection or receipt of
Rent by Landlord shall be deemed a waiver on the part of Landlord, or the
acceptance of the assignee, subtenant or occupant as Tenant, or a release of
Tenant from the further performance by Tenant of covenants on the part of Tenant
herein contained. Consent by Landlord to one Transfer will not be deemed consent
to any subsequent Transfer. In the event of default by any Transferee of Tenant
or any successor of Tenant in the performance of any of the terms hereof,

                                      -22-
<PAGE>   26

Landlord may proceed directly against Tenant without the necessity of exhausting
remedies against such Transferee or successor. Notwithstanding any contrary
provision of this Lease, if Tenant or any proposed Transferee claims that
Landlord has unreasonably withheld or delayed its consent to a proposed Transfer
or otherwise has breached its obligations under this Section 14, Tenant's and
such Transferee's only remedy shall be to submit such claim for resolution by
binding arbitration in accordance with the terms, conditions and provisions of
the Exhibit F attached to this Lease, and Tenant, on behalf of itself and, to
the extent permitted by law, such proposed Transferee, waives all other remedies
against Landlord, including without limitation, the right to seek monetary
damages or to terminate this Lease.

14.5     DEFINITIONS. For the purposes of this Lease, space in the Project shall
be considered "AVAILABLE FOR RENT" if (A) the applicable space is not then
leased by a tenant and is not then subject to any expansion options, rights of
first offer or other options or rights of other tenants or other third parties
(or is subject to any of the foregoing, but the party owning the same has
waived, been deemed to have waived, or failed to timely exercise the same with
respect to the leasing of the applicable space by Landlord), or (B) if the
applicable space is then leased and the applicable tenant's lease expires, or
shall terminate effective as of a date which is, 4 months or less from the date
on which it is being determined whether the applicable space is Available For
Rent and such space is not then subject to any expansion options, rights of
first offer or other options or rights of other tenants or other third parties
(or is subject to any of the foregoing, but the party owning the same has
waived, been deemed to have waived, or failed to timely exercise the same with
respect to the leasing of the applicable space by Landlord), and space in the
Project shall be considered "COMPARABLE IN SIZE" if it is between 90% and 110%
of the amount of net rentable square feet of space being compared to such space
(by way of example only, if Tenant is proposing to sublease 10,000 net rentable
square feet of the Premises, then any space containing at least 7,500 net
rentable square feet of space and not more than 12,500 net rentable square feet
of space would be considered Comparable in Size to such proposed subleased
portion of the Premises). For the purposes of this Lease, the term "AFFILIATE"
shall mean a person or entity directly or indirectly, through one or more
intermediaries, controlling, controlled by or under common control with the
party in question. The term "CONTROL", as used in this Section 14.5, means, with
respect to an entity that is a corporation, the right to the exercise, directly
or indirectly, of more than 50% of the voting rights attributable to the shares
of the controlled corporation and, with respect to an entity that is not a
corporation, the possession, directly or indirectly, of the power to direct or
cause the direction of the management or policies of the controlled entity. In
determining whether a person or entity is an Affiliate of an individual, the
aggregate voting rights or interests in other entities which are held by members
of such individual's immediate family members or by trusts for the benefit of
such individual's immediate family members shall be attributed to such
individual.

14.6     PERMITTED TRANSFERS. Notwithstanding anything to the contrary in this
Lease, Tenant may assign this Lease in its entirety or sublease all or any
portion of the Premises without the prior written consent of and without payment
of any fees to Landlord (including, without limitation attorney's fees) and
without triggering a right of Landlord to recapture of such portion of the
Premises to (1) any Affiliate of Tenant, (2) any partnership, corporation or
other business entity into or with which Tenant, or its permitted successors or
assigns, shall be merged, converted or consolidated in accordance with
applicable statutory provisions governing merger, conversion or consolidation of
the applicable business entity, or (3) a partnership, corporation or other
business entity which is a direct successor to Tenant owning all or
substantially all of Tenant's business and assets provided that, in connection
with any assignment or subletting described in clauses (1), (2) and (3) of this
Section 14.6, (a) Tenant shall have notified Landlord in writing prior to or
promptly after such assignment or subletting, (b) at the time thereof no Event
of Default has occurred and is continuing and no event has occurred which with
the giving of notice or the passage of time, or both, would constitute an Event
of Default, and (c) the proposed transferee shall deliver to Landlord a written
agreement whereby it expressly assumes all of the Tenant's obligations under
this Lease; provided, however, that any sublessee 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 applicable Transfer (excluding,
however, any obligation to pay Rent due hereunder). Any assignment or subletting
permitted without Landlord's prior written consent as provided above (a
"PERMITTED TRANSFER WITHOUT LANDLORD CONSENT") shall not release Tenant from any
of its existing or future obligations (including, without limitation, its
obligation to pay Rent) under this Lease. For the purposes of this Section 14.6,
the term "Tenant" shall also mean a permitted assignee or sublessee of the
initial Tenant named in this Lease.

15.      ENTRY BY LANDLORD.

Landlord and its employees and agents shall at all reasonable times and with
reasonable notice (except in the case of

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<PAGE>   27

an emergency) have the right to enter the Premises to inspect the same, to show
the Premises to prospective lenders or purchasers (or during the last four (4)
months of the Term, to prospective tenants), to post notices of
non-responsibility, and/or to alter, improve or repair the Premises as
contemplated by Section 11. In exercising such entry rights, Landlord shall use
best efforts to minimize, to the extent practicable, the interference with
Tenant's business, and shall provide Tenant with reasonable advance notice of
such entry (except in emergency situations) and (except in emergency situations)
shall be subject to such security procedures, including without limitation,
identification, sign-in and escorting as Tenant may reasonably require. Landlord
shall have reasonable means available to it to open Tenant's doors in an
emergency in order to obtain entry to the Premises. Any entry to the Premises
obtained by Landlord in accordance with this Section 15 shall not under any
circumstances be construed or deemed to be a forcible or unlawful entry into, or
a detainer of, the Premises, or an eviction of Tenant from the Premises or any
portion thereof, or grounds for any abatement or reduction of Rent and Landlord
shall not have any liability to Tenant for any damages or losses on account of
any such entry by Landlord except to the extent of Landlord's gross negligence
or willful misconduct.

16.      HEATING AND AIR CONDITIONING

         (a)      Landlord shall furnish on or before the Commencement Date the
following new, commercial-grade heating and air conditioning units located on
the roof of the Building above the Initial Premises (collectively, the "HVAC
UNITS"): ten (10) twenty ton air conditioning units. Landlord shall assign to
Tenant all repair and maintenance warranties owned by Landlord with respect to
the HVAC Units.

         (b)      Tenant shall operate the HVAC Units at its sole cost and
expense in accordance with its design criteria unless otherwise required by
applicable Laws. The cost of electricity consumed by the HVAC Units shall be
measured by a separate electric meter as provided in Section 5 above.

         (c)      Tenant shall be responsible for the repair and maintenance of
the HVAC Units and shall promptly notify Landlord of any damage to, or
malfunction of, the HVAC Units. Throughout the Term, Tenant shall contract with
a qualified and properly insured HVAC contractor reasonably acceptable to
Landlord to have the HVAC Units serviced at minimum of once every six (6)
months. Such service shall include, but not be limited to, cleaning of the coil
and condenser units on each unit; checking the electrical connections, the oil
and refrigerant for leaks, the safety-device, the blower belt for wear, tension
and alignment, the expansion valve, coil temperature, and condensate drain; and
maintaining the lubrication and addition of freon. Tenant shall secure, at its
sole cost and expense, and shall provide Landlord with a copy of the service
contract providing for the maintenance as described in this subparagraph, within
sixty (60) days following the Commencement Date, and thereafter, Tenant shall
renew or replace the service contract so the service contract or a replacement
thereof remains in full force and effect at all times until the expiration or
earlier termination of this Lease. Tenant shall provide Landlord with written
evidence of such renewal or replacement at least ten (10) days prior to
expiration of the then existing service contract. Landlord shall be responsible
for the replacement of the HVAC Units, except to the extent such replacement is
a result of the failure of Tenant to perform its maintenance obligations for the
HVAC units or is caused by Landlord, its employees, or contractors.

         (d)      The HVAC Units shall be for the sole use of Tenant and the
Premises.

17.      INDEMNIFICATION AND EXCULPATION.

17.1     TENANT'S ASSUMPTION OF RISK AND WAIVER. Except to the extent such
matter is not covered by the insurance required to be maintained by Tenant under
this Lease and such matter is indemnified by Landlord pursuant to Section
17.2(b) below, Landlord shall not be liable to Tenant, Tenant's employees,
agents or invitees for: (a) any loss (including loss by theft) or damage to
property of Tenant, or of others, located in, on or about the Premises, the
Generator Pad, or the Satellite Dish Area, which property shall be the sole risk
of Tenant; (b) any injury to, or death of any, persons or any loss of, or damage
to, any property resulting from fire, explosion, falling plaster, steam, gas,
electricity, water, rain or leaks from any part of the Premises or from the
pipes, appliance of plumbing works or from the roof, street or subsurface or
from any other places or by dampness or by any other cause of whatsoever nature;
or (c) any such damage caused by other persons in, on or about the Premises, the
Generator Pad or the Satellite Dish Area, occupants of adjacent property, or the
public, or caused by operations in construction of any private, public or
quasi-public work. Tenant, as a material part of the consideration to be
rendered to Landlord under this Lease and to the extent permitted by law, hereby
waives all claims, INCLUDING

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<PAGE>   28

ANY CLAIMS CAUSED BY OR RESULTING FROM THE NEGLIGENCE OF LANDLORD OR ANY
LANDLORD INDEMNIFIED PARTIES, except to the extent caused by or resulting from
the gross negligence or willful misconduct of Landlord or any Landlord
Indemnified Parties, Tenant or Tenant's successors or Transferees may have
against Landlord or any Landlord Indemnified Parties, for any of the matters
described in subparts (a) through (c) of this Section 17.1. Landlord shall in
no event be liable for any consequential damages or loss of business or profits
and Tenant hereby waives any and all claims for any such damages.

17.2     INDEMNIFICATION.

         (a)      Tenant shall be liable for, and shall indemnify, defend,
protect and hold Landlord and the Landlord Indemnified Parties harmless from and
against, any and all Claims (INCLUDING, WITHOUT LIMITATION, ANY CLAIMS CAUSED BY
OR RESULTING FROM THE NEGLIGENCE OF LANDLORD OR ANY LANDLORD INDEMNIFIED
PARTIES) arising or resulting from (i) any injury to, or death of, any person,
or any loss of, or damage to, any property connected with the use, condition or
occupancy of the Premises; (ii) any act, omission or negligence of Tenant or any
of the Tenant's Parties; (iii) the use of the Premises and conduct of Tenant's
business by Tenant or any Tenant Parties, or any other activity, work or thing
done, permitted or suffered by Tenant or any Tenant Parties, in, on or about the
Premises; and (iv) any breach, violation, or non-performance of any obligation
of Tenant hereunder; provided, however, such indemnification by Tenant shall not
include Claims waived by Landlord in Section 21 below, and Tenant shall not be
required to indemnify or hold Landlord or the Landlord Indemnified Parties
harmless from any Claims to the extent resulting from the sole or gross
negligence or willful misconduct of Landlord or any Landlord Indemnified
Parties. In case any action or proceeding is brought against Landlord or any
Landlord Indemnified Parties by reason of any such indemnified Claims, Tenant,
upon notice from Landlord, shall defend the same at Tenant's expense by counsel
selected by Tenant.

         (b)      Landlord shall be liable for, and shall indemnify, defend,
protect and hold Tenant and the Tenant Indemnified Parties harmless from and
against any and all Claims (INCLUDING, WITHOUT LIMITATION, ANY CLAIMS CAUSED BY
OR RESULTING FROM THE COMPARATIVE NEGLIGENCE OF TENANT OR ANY TENANT INDEMNIFIED
PARTIES) which are suffered by, recovered from or asserted against Tenant or any
Tenant Indemnified Parties and which (i) are not paid by proceeds of insurance
carried by Landlord, Tenant or any Tenant Indemnified Parties, and (ii) arise
from or in connection with (A) the use of the Common Areas by Tenant or any
Tenant Indemnified Parties, or (B) the gross negligence or willful misconduct of
Landlord or any of the Landlord Indemnified Parties; provided, however, such
indemnification by Landlord shall not include (1) Claims waived by Tenant in
Section 17.1 above or in Section 21 below, (2) any Claim to the extent caused by
or resulting from the sole or gross negligence or willful misconduct of Tenant
or its assignees, sublessees, officers, directors, employees, agents, servants,
contractors, customers or invitees, or (3) Claims arising in connection with
Tenant's or any Tenant Indemnified Parties' use of the Satellite Dish Area, or
the Generator Pad. In case any action or proceeding is brought against Tenant or
any Tenant Indemnified Parties by reason of any such indemnified Claims,
Landlord, upon notice from Tenant, shall defend the same at Landlord's expense.

18.      DAMAGE OR DESTRUCTION.

18.1     RIGHTS OF LANDLORD AND TENANT. In the event the Premises or the Project
are damaged by fire or other insured casualty and the insurance proceeds have
been made available therefor by the holder or holders of any mortgages or deeds
of trust covering the Project (each a "Mortgagee") or by any lessor under a
ground lease covering the Project (a "Ground Lessor"), the damage shall be
repaired by and at the expense of Landlord to the extent of such insurance
proceeds available therefor, provided such repairs can, in Landlord's sole
opinion, be made within one hundred twenty (120) days after the occurrence of
such damage without the payment of overtime or other premiums. Until such
repairs are completed, Rent shall be abated effective as of the date of such
fire or other casualty in proportion to the part of the Premises which is
unusable by Tenant in the conduct of its business. If repairs cannot, in
Landlord's sole opinion, be made within one hundred twenty (120) days after the
occurrence of such damage without the payment of overtime or other premiums,
Landlord may, at its option, make them within a reasonable time, and in such
event, this Lease shall continue in effect and Rent shall be abated in the
manner provided in the immediately preceding sentence. In the case of repairs
which, in Landlord's opinion, cannot be made within such one hundred twenty
(120) day period, or in the event that insurance proceeds for repairs have not
been made available to Landlord by a Mortgagee or Ground Lessor, or if the
Premises or the Project are damaged by a casualty not covered by Landlord's
insurance, Landlord shall notify Tenant within sixty (60) days of the date of

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<PAGE>   29

occurrence of such damage as to whether or not Landlord will make such repairs.
If Landlord elects not to make such repairs, then either party may, by written
notice to the other, terminate this Lease as of the date of the occurrence of
such damage, and Landlord shall have no liability to Tenant for failure to make
such repairs except for abatement of Rent. Except as provided in this Section
18.1, there shall be no abatement of Rent and no liability of Landlord by
reason of any injury to or interference with Tenant's business or property
arising from the making of any such repairs, alterations or improvements in or
to any portion of the Project and/or the Premises, or in or to fixtures,
appurtenances and equipment located therein, and, in any event, there shall be
no liability of Landlord should repairs require more than one hundred twenty
(120) days for completion; provided, however, if Landlord makes repairs,
Landlord shall do so as quickly as possible without the payment of overtime or
premiums (unless Tenant agrees to bear the costs of such overtime or premiums).
In addition, Tenant shall have the right, at its sole cost and expense, to
install temporary facilities for the operation of any or all of its business, to
the extent appropriate facilities are available, during the rebuilding period at
a location at the Project proposed by Tenant and approved by Landlord, provided
that (i) such installation shall comply with all applicable Laws relating
thereto, (ii) Tenant obtains all necessary permits and/or approvals from the
City of North Richland Hills and all other Governmental Authorities having
jurisdiction over Tenant and/or the Project and provides Landlord with written
evidence of the same, (iii) Tenant shall remove all such installation upon
completion of the repair of the Premises, and (iv) Tenant shall have furnished
Landlord, in the form and content required by Section 20 below, with evidence of
the insurance that Tenant is obligated to furnish to Landlord pursuant to
Section 20. If the Premises is damaged so that Tenant cannot reasonably conduct
its business therein and such damage was not caused, in whole or in part, by any
act, omission or negligence of Tenant or any officers, employees, agents,
contractors, subcontractors, sublessees or licensees of Tenant, then immediately
following such damage, Tenant shall have the right, at its sole cost and
expense, to relocate the Premises for the balance of the Term to any other space
in the Project that is not then leased to another tenant; provided, however,
Tenant shall not have the foregoing right if at the time Tenant elects to
exercise the same an Event of Default has occurred and is continuing or an event
has occurred and is continuing which with the giving of notice or the passage of
time, or both, would constitute an Event of Default. Tenant must exercise the
forgoing relocation right by giving Landlord written notice thereof within
forty-five (45) days after the date Landlord delivers written notice to Tenant
as to whether Landlord shall repair such damage. Landlord will cooperate with
Tenant in identifying space at the Project that is available for lease and in
connection with Tenant's relocation to the same, and if Tenant timely exercises
its relocation right, Landlord and Tenant will enter into an amendment to this
Lease to address the correct size and location of the relocated Premises, which
relocated Premises shall in no event be less than 95% of the net rentable square
footage of the Premises at the time of such damage.

18.2     AGREEMENTS REGARDING LANDLORD'S REPAIRS. If Landlord is obligated to
repair damage to the Premises or the Project pursuant to Section 18.1 above or
Landlord has otherwise agreed in writing to repair such damage (subject to the
terms and conditions of such other agreement), Landlord shall use reasonable
efforts to complete or cause the completion of the repairs to the same on or
before the expiration of the Casualty Repair Delivery Period (as defined below
in this Section 18.2). Notwithstanding anything else to the contrary contained
in this Lease, if Landlord, for any reason whatsoever, cannot complete or cause
the completion of the repair of the applicable damage to the Premises such that
the Premises are usable by Tenant for the purposes identified in Section 1.8 of
the Summary on or before the last day of the Casualty Repair Delivery Period,
then Landlord shall not be liable to Tenant for any loss or damage resulting
therefrom, other than any rental abatement expressly provided for herein,
provided but Tenant shall, as its sole and exclusive remedy, have the right to
terminate this Lease by giving Landlord written notice thereof. As used herein,
the term "CASUALTY REPAIR DELIVERY PERIOD" shall mean the period of time
beginning on the date the Premises and the Building have been damaged by fire or
other insured casualty and ending on the date which shall be determined by
adding to the 240th day after such damage date the number of days, if any, that
Landlord is delayed and/or prevented from completing or causing the completion
of the repair of the applicable damage to the Premises as a result of Force
Majeure Delays (as defined in Section 31.15 below). If (i) Tenant attempts to
terminate this Lease pursuant to this Section and delivers to Landlord written
notice of such termination, and (ii) Landlord in good faith disputes such
attempted termination, Landlord shall notify Tenant in writing of such dispute
(a "LEASE TERMINATION DISPUTE NOTICE") within ten (10) days after Landlord's
receipt of Tenant's written notice of termination, and Landlord and Tenant shall
thereafter proceed to diligently and in good faith attempt to resolve such
dispute and, if the parties are unable to resolve the same within thirty (30)
days after Tenant's receipt of the applicable Lease Termination Dispute Notice,
such dispute shall be submitted for resolution by binding arbitration in
accordance with the terms, conditions and provisions of the Exhibit F attached
to this Lease. If Landlord timely delivers a Lease Termination Dispute Notice to
Tenant, the applicable written termination notice of Tenant shall be of no force
or effect until such time, if any, as either (y) Landlord and Tenant

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<PAGE>   30

agree otherwise in a writing signed by both parties, or (z) a panel of
arbitrators decides that Tenant's termination of this Lease was, in fact,
effective; provided, however, if Tenant prevails in the arbitration of such
dispute, the termination of this Lease shall be effective as of the date set
forth in Tenant's written notice of termination, but further provided that
notwithstanding such earlier effective termination of this Lease, if during the
time period from such proposed termination date until the date of the
arbitrators' decision, to the extent Tenant is in possession and occupancy of
the Premises, Tenant shall pay Rent and other charges and shall otherwise comply
with all provisions of this Lease. If Landlord fails to dispute any such written
termination notice of Tenant within such ten (10) day period, Tenant's written
termination notice shall conclusively be deemed to be effective for the purposes
of this Section.

18.3     ACKNOWLEDGMENTS REGARDING REPAIRS. Tenant acknowledges and agrees that
(i) Landlord will not carry insurance of any kind on (1) Tenant's furnishings or
furniture, (2) the Tenant Improvements in the Premises, or (3) any fixtures or
equipment removable by Tenant under the provisions of this Lease, and (ii)
Landlord shall not be required to repair any injury or damage caused by fire or
other cause, or to make any repairs or replacements to or of improvements
installed in the Premises by or for Tenant, all of which shall be the sole
responsibility of Tenant.

19.      EMINENT DOMAIN.

19.1     TOTAL OR PARTIAL TAKING.

         (a) In the event (i) all of the Premises, or such substantial part of
the Premises or the Project as shall materially and adversely interfere with
Tenant's ability to conduct its business upon the Premises, shall be taken for
any public or quasi-public purpose by any lawful power or authority by exercise
of the right of appropriation, condemnation or eminent domain, or sold in lieu
of or to prevent such taking, or (ii) so much of the Common Parking Area shall
be taken for any public or quasi-public purpose by any lawful power or authority
by exercise of the right of appropriation, condemnation or eminent domain, or
sold in lieu of or to prevent such taking and, after such taking or sale in lieu
thereof, Landlord can no longer provide Tenant with Tenant's allocated parking
spaces as provided in Section 6.8 above (unless Tenant at its sole option elects
to reduce its parking rights accordingly), either party shall have the right to
terminate this Lease by providing the other party (and, with respect to a
termination by Tenant, any Mortgagee or Ground Lessor) written notice thereof
within thirty (30) days of such party's receipt of a notice of such taking. Such
termination shall be effective as of the date possession is required to be
surrendered to said authority. Said termination of this Lease shall not release
Landlord or Tenant from any obligations or liabilities of such party under this
Lease, actual or contingent, which have accrued on or prior to said termination.
Landlord shall be entitled to receive the entire amount of any award without
deduction for any estate or interest of Tenant; provided, however, in the event
of such a taking, Tenant shall be entitled to such share of the award as is
equitably attributable to Tenant Changes and Tenant's Property (if any), and
Tenant shall have the right to recover from any condemning authority, through a
separate award which does not reduce Landlord's award, any compensation as may
be awarded Tenant on account of moving and relocation expenses and depreciation
to and removal of Tenant's physical property from the Premises, including,
without limitation, any of Tenant's Property.

         (b) In the event of a taking described in Section 19.1(a) and this
Lease is not terminated as described in such section, then this Lease shall
continue in full force and effect except that after such taking, the Annual
Rent shall be reduced in proportion to the area taken, effective on the date
physical possession is taken by the condemning authority. Following such partial
taking, Landlord shall make all necessary repairs or alternations within the
scope of Exhibits K-1 and K-2 necessary to make the Premises an architectural
whole, in Landlord's reasonable business judgement.

19.2     TEMPORARY TAKING. In the event of taking of the Premises or any part
thereof for temporary use, (a) this Lease shall be and remain unaffected thereby
and Rent shall not abate, except as set forth in this section, and (b) Tenant
shall be entitled to receive for itself such portion or portions of any award
made for such use with respect to the period of the taking which is within the
Term, provided such award is expressly allocated to the Premises. In the event
of a temporary taking, Rent shall be abated effective for the period of such
taking in proportion to the part of the Premises which is unusable by Tenant in
the conduct of its business. Any temporary taking which continues for thirty
(30) days shall be governed by Section 19.1 above.

20.      TENANT'S INSURANCE; LANDLORD'S INSURANCE.

20.1     TYPES OF INSURANCE TO BE MAINTAINED BY TENANT. On or before the earlier
of the Commencement Date or

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<PAGE>   31

the date Tenant commences or causes to be commenced any work of any type in or
on any portion of the Premises, and continuing during the entire Term, Tenant
shall obtain and keep in full force and effect respecting the Premises, the
following insurance:

         (a)      Special Form (formerly referred to as "All Risk") property
insurance, including fire and extended coverage, sprinkler leakage, vandalism,
and malicious mischief coverage, upon property and improvements owned by Tenant
of every description and kind located in the Premises or otherwise at the
Project, including, without limitation, furniture, equipment and any other
personal property, any Tenant Changes, the Satellite Dish (as defined in the
Exhibit E attached hereto), if applicable, Tenant's Power Generator (as defined
in the Exhibit J attached hereto), if applicable, and any other improvements in
or to the Premises or located in the Satellite Dish Area or the Generator Pad in
an amount not less then the full replacement cost thereof. This insurance shall
be on an occurrence basis. Evidence of this insurance shall be provided on ACORD
Form 27.

         (b)      Commercial general liability insurance coverage, including
personal injury, bodily injury (including wrongful death), broad form property
damage, operations hazard, owner's protective coverage, contractual liability
(including Tenant's indemnification obligations under this Lease, including
Section 17 hereof), liquor liability (if Tenant serves or stores alcohol on the
Premises), products and completed operations liability, and owned/non-owned auto
liability, with a general aggregate of not less than Five Million Dollars
($5,000,000). The general aggregate amount of such commercial general liability
insurance may be increased every three (3) years during the Term to an amount
reasonably required by Landlord. Tenant's liability insurance shall be written
on an occurrence basis on a form approved by Landlord (which approval will not
be unreasonably withheld). All commercial general liability insurance maintained
by Tenant as required by this Lease (and any commercial umbrella applicable
thereto) shall be endorsed using a waiver of subrogation form or forms approved
by Landlord (which approval will not be unreasonably withheld), and any such
endorsements shall be unmodified and shall be in favor of all Landlord Parties.
Landlord's approval of the form of Tenant's liability insurance may not be
withheld if the form of such insurance is identical in all material respects to
either Insurance Services Office "ISO") form CG 0001 1092 or CG 0001 0695 or any
successor forms. Landlord's approval of waiver of subrogation endorsement forms
may not be withheld if the form of such endorsement is identical in all material
respects to ISO form CG 2404 1093 or any successor form.

         (c)      Worker's compensation in statutory amounts and limits, and
employer's liability insurance in an amount not less than $1,000,000.00 or the
amount required by law, whichever is greater, covering all persons employed in
connection with any work done on or about the Premises for which claims for
death or bodily injury could be asserted against Landlord, Tenant or the
Premises. All employer's liability insurance maintained by Tenant as required by
this Lease (and any commercial umbrella applicable thereto) shall be endorsed
using an endorsement form approved by Landlord (which approval will not be
unreasonably withheld) (i.e., a waiver of subrogation endorsement), and such
endorsement shall be in favor of all Landlord Parties. Landlord's approval in
this subparagraph may not be withheld if the form of endorsement is identical in
all material respects to ISO endorsement form WC 429394 or any successor form of
endorsement.

         (d)      Business income and extra expense insurance (formerly known as
"business interruption insurance") in such amounts as will reimburse Tenant for
direct or indirect loss of earnings attributable to all perils commonly insured
against by prudent tenants or attributable to prevention of access to the
Premises or to the Building as a result of such perils.

         (e)      Any other form or forms of insurance as Tenant or Landlord or
any Mortgagee or Ground Lessor may reasonably require from time to time, in
form, amounts and for insurance risks against which a prudent tenant would
protect itself. but only to the extent such risks and amounts are available in
the insurance market at commercially reasonable costs. If Tenant or any
contractor of Tenant performs any work on any portion or portions of the
Premises or, as expressly permitted by this Lease, on approved areas of the roof
of the Building and/or approved areas of the Project, prior to the commencement
of any such work, Tenant shall deliver to Landlord certificates issued by
insurance companies licensed to do business in the State of Texas, in form and
content reasonably acceptable to Landlord, evidencing that commercial general
liability, workers' compensation, employer's liability, automobile liability and
other insurance as required by Landlord and any Mortgagee or Ground Lessor, in
amounts and with companies reasonably satisfactory to Landlord, are in force and
effect and maintained by all contractors and subcontractors engaged by Tenant or
any contractor of Tenant to perform such work, and name all Landlord Parties as
additional insureds.

                                      -28-
<PAGE>   32

         (f)      Tenant represents to Landlord that Tenant's insurance policies
contain an express prohibition on Tenant's insurance being primary and
non-contributory to any other insurance carried by Landlord or Landlord Parties.
In the event such representation is untrue or in the event Tenant's insurance at
any time does not contain such an express prohibition, Tenant's insurance shall
be primary and non-contributory to any other insurance carried by Landlord or
any Landlord Parties.

20.2     REQUIREMENTS FOR TENANT'S INSURANCE. Each policy required to be
obtained by Tenant hereunder shall: (a) be issued by insurers which are
reasonably approved by Landlord and/or Landlord's mortgagees and are authorized
to do business in the state in which the Premises is located and rated not less
than financial class X, and not less than policyholder rating A in the most
recent version of Best's Key Rating Guide; (b) be in form reasonably
satisfactory from time to time to Landlord; (c) name Tenant as named insured
thereunder and name Landlord as additional insureds (and with respect to the
insurance described in Section 20.1 (a) above, as loss-payees) thereunder, all
as their respective interests may appear; (d) not have a deductible amount
exceeding Ten Thousand Dollars ($10,000), (except for earthquake and flood
insurance, if any, which shall have a deductible amount not to exceed five
percent (5%) of the replacement cost); (e) specifically provide that the
insurance afforded by such policy for the benefit of Landlord and Landlord's
mortgagees and ground lessors shall be primary, and any insurance carried by
Landlord or Landlord's mortgagees and ground lessors shall be excess and
non-contributing; (f) except for worker's compensation insurance, contain an
endorsement that the insurer waives its right to subrogation as described in
Section 21 below; (g) contain a requirement by the insurer to notify (or be
endorsed to require that such insurer notify) Landlord (and the mortgagees and
ground lessors of Landlord who are named as additional insureds) in writing not
less than thirty (30) days prior to any change, reduction in coverage,
cancellation or other termination thereof (except that only ten (10) days notice
shall be required prior to cancellation for failure to pay premiums); and (h) be
in amounts sufficient at all times to satisfy any coinsurance requirements
thereof. Each such policy shall also provide that any loss otherwise payable
thereunder shall be payable notwithstanding (i) any act or omission of Tenant
which might, absent such provision, result in a forfeiture of all or a part of
such insurance payment, (ii) the occupation or use of the Premises for purposes
more hazardous than permitted by the provisions of such policy, (iii) any
foreclosure or other action or proceeding taken by any Mortgagee pursuant to any
provision of the mortgage upon the happening of a default thereunder, or (iv)
any change in title or ownership of the Premises; provided, however, that with
respect to clauses (iii) and (iv), Tenant requires notice of such an event in
order to add the Mortgagee and/or any new title holder as an Additional Insured
and such clauses will only be applicable following notice to Tenant's insurance
carrier of such events. Tenant agrees to deliver to Landlord, as soon as
practicable after the placing of the required insurance, but in no event later
than five (5) days prior to the date Tenant takes possession of all or any part
of the Premises, certificates from the insurance company evidencing the
existence of such insurance and Tenant's compliance with the foregoing
provisions of this Section 20. Tenant shall cause replacement certificates to be
delivered to Landlord not less than thirty (30) days prior to the expiration of
any such policy or policies. Copies of endorsements to the applicable insurance
policy must be attached to all certificates delivered by Tenant to Landlord as
required by this Lease. If any such initial or replacement certificates are not
furnished within the time(s) specified herein, or Tenant otherwise fails to
satisfy its obligations under this Section 20 and such failure continues for ten
(10) business days after Tenant's receipt of written notice of such failure,
shall constitute an Event of Default without the benefit of any additional
notice or cure period provided in Section 22.1 below, and Landlord shall have
the right, but not the obligation, to cure such default at Tenant's expense. As
used in this Section 20, the term "Landlord Parties" shall mean (i) Landlord,
(ii) any lender whose loan is secured by a lien against the Project, or any
portion thereof, that has been identified to Tenant in a writing sent by
Landlord or its agent or property manager, (iii) any ground lessor of all or any
portion of the Project that has been identified to Tenant in a writing sent by
Landlord or its agent or property manager, (iv) the Building manager and any
other parties which Landlord shall deem necessary, (v) their respective
shareholders, members, partners, Affiliates and subsidiaries, and (vi) any
directors, officers, managers, employees, agents or contractors of such persons
or entities.

20.3     EFFECT ON INSURANCE. Tenant shall not do or permit to be done
anything which will violate or invalidate any insurance policy maintained by
Tenant hereunder. If Tenant's occupancy or conduct of its business in or on the
Premises results in any increase in premiums for any insurance carried by
Landlord, Tenant shall pay such increase as additional rent within ten (10) days
after being billed therefor by Landlord. Landlord represents that use of the
Premises for general office use, a network operations center and computer and
telecommunications equipment rooms will not increase the premiums for Landlord's
insurance. If any insurance coverage carried by Landlord shall be canceled or
reduced (or cancellation or reduction thereof shall be threatened) by reason of
the use or occupancy of the Premises by Tenant or by anyone permitted by Tenant
to be upon the Premises, and if Tenant fails to remedy

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<PAGE>   33

such condition within five (5) days after written notice thereof, Tenant shall
be deemed to be in default under this Lease, without the benefit of any
additional notice or cure period specified in Section 22.1 below, and Landlord
shall have all remedies provided in this Lease, at law or in equity, including,
without limitation, the right (but not the obligation) to enter upon the
Premises and attempt to remedy such condition at Tenant's cost.

20.4     TYPES OF INSURANCE TO BE MAINTAINED BY LANDLORD. Except as otherwise
provided in this Section 20.4, Landlord covenants and agrees that throughout the
Term it will maintain Special Form property insurance, including fire and
extended coverage, vandalism, and malicious mischief coverage upon the Building
(excluding excavation, foundation, footings and underground flues and drains)
and the machinery, boilers and equipment contained therein owned by Landlord
(excluding any property with respect to which Tenant is obligated to insure
pursuant to the provisions of Section 20.1 above), in an amount not less than
the full replacement cost thereof as reasonably determined by Landlord. Landlord
will also, throughout the Term, carry public liability and property damage
insurance with respect to the operation of the Project in reasonable amounts as
would be customarily carried by an owner of a similar property in the vicinity
of the Project. Landlord may, but shall not be obligated to, take out and carry
any other form or forms of insurance as Landlord or any Mortgagee or Ground
Lessor may reasonably determine to be advisable, and Landlord shall take out and
carry any other form or forms of insurance as any Mortgagee or Ground Lessor
shall require of Landlord. Notwithstanding any contribution by Tenant to the
cost of insurance premiums as provided herein, Tenant acknowledges that it has
no right to, receive any proceeds from any such insurance policies carried by
Landlord and that such insurance will be for the sole benefit of Landlord with
no coverage for Tenant for any risk against which insurance has been obtained.

20.5     DELIVERY OF EVIDENCE OF LANDLORD'S INSURANCE. If requested in writing
by Tenant during the Term (but not more than once in any 12 month period),
Landlord shall provide Tenant with evidence that Landlord is maintaining the
insurance required pursuant to Section 20.4 above; provided, however, Landlord
shall have no obligation to furnish the foregoing evidence of Landlord's
insurance at any time in which an Event of Default has occurred and is
continuing or an event has occurred and is continuing which with the giving of
notice or the passage of time, or both, would constitute an Event of Default.

21.      WAIVER OF SUBROGATION. All fire, extended coverage and/or damage
insurance which must be carried by Tenant or Landlord shall be endorsed with a
subrogation clause substantially as follows: "We waive any right of recovery we
may have against the designated person or organization shown below because of
payments we make for injury or damage arising out of your ongoing operations or
done under a contract with that person or organization and included in the
products-completed operations hazard. This waiver applies only to the designated
person or organization." Tenant agrees to take all actions necessary to ensure
that (a) Landlord shall be a "designated person or organization" for purposes of
the foregoing at all times while this Lease is in effect and (b) Tenant's fire,
extended coverage and/or damage insurance waives all rights of recovery against
Landlord in accordance with the foregoing subrogation clause. Landlord and
Tenant each hereby waives any rights it may have against the other (including,
but not limited to, a direct action for damages) on account of any loss or
damage occasioned to Landlord or Tenant, as the case may be (WHETHER OR NOT SUCH
LOSS OR DAMAGE IS CAUSED BY THE FAULT, NEGLIGENCE OR OTHER TORTIOUS CONDUCT,
ACTS OR OMISSIONS OF LANDLORD OR TENANT OR THEIR RESPECTIVE OFFICERS, PARTNERS,
DIRECTORS, EMPLOYEES, SERVANTS AGENTS OR INVITEES), to their respective
property, the Premises, its contents or to any other portion of the Property
arising from any risk covered by the current Texas State Board of Insurance
promulgated form of property insurance and the customary commercially obtainable
endorsements thereto, or covered by any other insurance required to be carried
by Tenant and Landlord, respectively, pursuant to this Lease. If a party waiving
rights under this Section is carrying a property insurance policy in the
promulgated form used in the State of Texas and an amendment to such promulgated
form is passed, such amendment shall be deemed not a part of such promulgated
form until it applies to the policy being carried by the waiving party. Without
in any way limiting the foregoing waivers and to the extent permitted by
applicable law, the parties hereto each, on behalf of their respective insurance
companies insuring the property of either Landlord or Tenant against any such
loss, waive any right of subrogation that Landlord or Tenant or their respective
insurers may have against the other party or their respective officers,
directors, employees, agents or invitees and all rights of their respective
insurance companies based upon an assignment from its insured. Each party to
this Lease agrees immediately to give to each such insurance company written
notification of the terms of the mutual waivers contained in this Section and to
have said insurance policies properly endorsed, if necessary, to prevent the
invalidation of said insurance coverage by reason of said waivers. The foregoing
waivers shall be effective whether or not the parties maintain the required
insurance.

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<PAGE>   34

22.      TENANT'S DEFAULT AND LANDLORD'S REMEDIES.

22.1     TENANT'S DEFAULT. The occurrence of any one or more of the following
events shall constitute an event of default under this Lease by Tenant (an
"EVENT OF DEFAULT"):

         (a)      with respect to the payments of Rent (whether a monthly
installment of Annual Rent or any other amount due and payable by Tenant
pursuant to this Lease) due from Tenant to Landlord under this Lease not made by
Tenant when due, the failure by Tenant to make such payment to Landlord within
five (5) days after Tenant receives written notice specifying that the
applicable payment was not made when such payment was due; provided, however, in
the event Tenant fails to pay the monthly installment of Annual Rent when due
for a period of four (4) consecutive months, Tenant shall thereafter not be
entitled to any further notices of the failure to pay Rent, and the failure of
the Tenant to pay Rent within five (5) days of the date when due shall be an
Event of Default, without further notice;

         (b)      the failure by Tenant to observe or perform any of the express
or implied covenants or provisions of this Lease to be observed or performed by
Tenant, other than as specified in Section 22.1 (a) above, where such failure
shall continue for a period of thirty (30) days after written notice thereof
from Landlord to Tenant; provided, however, that if the nature of Tenant's
default is such that more than thirty (30) days are reasonably required for its
cure, then Tenant shall not be deemed to be in default if Tenant shall commence
such cure within said thirty (30) day period and thereafter diligently prosecute
such cure to completion within ninety (90) days after such written notice of
default (or such longer time as Landlord may agree in writing), but in any event
prior to the time such failure would result in a violation of applicable Laws or
a default by Landlord under any lease or lien affecting the Project or the
Building;

         (c)      a breach by Tenant of any of the provisions of Sections
12.4(a) and 14 hereof,

         (d)      the doing, or permitting to be done, by Tenant of any act
which creates a mechanic's lien or claim therefor against the Project or any
part thereof or against the interest of Landlord in the leasehold hereby created
if the same is not released, bonded or otherwise provided for by indemnification
satisfactory to Landlord within thirty (30) days after Tenant first obtains
actual knowledge of such lien or claim;

         (e)      the occurrence and continuance of a Vacation of the Premises
(as hereinafter defined); or

         (f)      (i) the making by Tenant of any general assignment for the
benefit of creditors (ii) the filing by or against Tenant of a petition to have
Tenant adjudged a bankrupt or a petition for reorganization or arrangement under
any law relating to bankruptcy (unless in the case of a petition filed against
the Tenant the same is dismissed within ninety [90] days) (iii) the appointment
of a trustee or receiver to take possession of substantially all of Tenant's
assets located at the Premises or of Tenant's interest in this Lease where
possession is not restored to Tenant within ninety (90) days or (iv) the
attachment execution or other judicial seizure of substantially all of Tenant's
assets located at the Premises or of Tenant's interest in this Lease where such
seizure is not discharged within ninety (90) days.

As used in this Lease, the phrase "VACATION OF THE PREMISES" shall mean vacating
the Premises without providing a reasonable level of security to minimize the
potential for vandalism, or where the coverage of the property insurance under
Section 20.l(a) is jeopardized as a result thereof.

22.2.    LANDLORD'S REMEDIES. Upon the occurrence and during the continuance of
an Event of Default, then, and in any such event, Landlord, besides other rights
or remedies it may have under this Lease, at law or in equity and without
prejudice to any of the same, shall have the option, without any notice to
Tenant (except as expressly provided below) and with or without judicial
process, to pursue any one or more of the following remedies:

         (a)      Landlord may terminate this Lease by written notice to Tenant,
in which event Tenant shall immediately surrender the Premises to Landlord.

         (b)      To the extent permitted by applicable Laws, Landlord may enter
upon and take custodial possession of all or any portion of the Premises by
picking the locks if necessary, lock out or remove Tenant and any other person
occupying all or any portion of the Premises and alter the locks and other
security devices at the

                                      -31-
<PAGE>   35

Premises, all without Landlord being deemed guilty of trespass or becoming
liable for any resulting loss or damage (except as may be caused by Landlord or
its agent's gross negligence or intentional misconduct) and without causing a
termination or forfeiture of this Lease or of Tenant's obligation to pay rent.

         (c)      Landlord may enter all or any portion of the Premises and take
possession of and remove any and all trade fixtures and personal property
situated thereon, without liability for trespass or conversion. Landlord may
retain control over all such property for the purpose of foreclosing the liens
and security interests described in Section 31.20 below by public or private
sale. If Landlord takes possession of and removes personal property from the
Premises, then prior to any disposition of the property by sale or until Tenant
reclaims the property if no foreclosure by public or private sale is
contemplated, Landlord may store it in a public warehouse or elsewhere at the
cost of and for the account of Tenant without the resort to legal process and
without becoming liable for any resulting loss or damage.

Landlord's pursuit of any remedy specified in this Lease will not constitute an
election to pursue that remedy only, nor preclude Landlord from pursuing any
other remedy available at law or in equity, nor constitute a forfeiture or
waiver of any Rent or other amount due to Landlord as described below.

22.3     RE-ENTRY AND RE-LETTING. In the event Landlord enters and takes
possession of all or any portion of the Premises without electing to terminate
this Lease, Landlord will have the right to relet all or any portion of the
Premises for Tenant, in the name of Tenant or Landlord or otherwise, on such
terms as Landlord deems advisable and Tenant hereby appoints Landlord its
attorney-in-fact for such purposes. Landlord will not be required to incur any
expenses to relet all or any portion of the Premises, although Landlord may at
its option incur customary leasing commissions or other costs for the account of
Tenant as Landlord shall deem necessary or appropriate to relet. In no event
will the failure of Landlord to relet all or any portion of the Premises reduce
Tenant's liability for monthly rentals and other charges due under this Lease or
for damages. To the extent Landlord is obligated under Texas law to mitigate its
damages following a default by Tenant under this Lease, Landlord may satisfy
such obligation by retaining a real estate broker (such broker can be the same
as the broker that is leasing the other space in the Building and/or Project
which is available for rent) and acknowledging that all portions of the Premises
as available for lease; provided, however, in no event shall Landlord be
obligated to either (a) relet all or any portion(s) of the Premises for less
than the then market value of such premises as determined by Landlord, or (b)
relet all or any portion(s) of the Premises unless there is/are no other
comparable space/spaces available for lease at the Project. Without causing a
surrender or forfeiture of this Lease after the occurrence and during the
continuance of an Event of Default, Landlord may: (i) relet all or any portion
of the Premises for a term or terms to expire at the same time as, earlier than,
or subsequent to, the expiration of the Term; (ii) remodel or change the use and
character of all or any portion of the Premises; and (iii) grant rent
concessions in reletting all or any portion of the Premises, if necessary in
Landlord's judgment, without reducing Tenant's obligation for rentals specified
in this Lease. Landlord may retain the excess, if any, of the rent earned from
reletting all or any portion of the Premises over the rentals specified in this
Lease, and such excess, after deduction of all costs incurred in connection with
such re-letting, including without limitation, any tenant concessions, tenant
improvements and allowances, commissions, and reasonable attorneys' fees, shall
be credited against the amounts owed by Tenant to Landlord under this Lease
(provided, however, in no event shall Landlord be required to pay Tenant any of
such excess and in no event shall Landlord be delayed in enforcing any remedy
against Tenant by virtue of such credit). The foregoing shall not be deemed to
relieve Landlord from any obligation under Texas law to mitigate the damages of
Landlord arising as a result of a default by Tenant under this Lease.

22.4     CONTINUATION OF LEASE. Upon the occurrence and during the continuance
of an Event of Default, in addition to any other remedies available to Landlord
under this Lease, at law or in equity, and subject to the foregoing provisions
regarding mitigation of damages, Landlord shall have the right to continue this
Lease in full force and effect, whether or not Tenant shall have abandoned the
Premises. In the event Landlord elects to continue this Lease in full force and
effect pursuant to this Section 22.4, then Landlord shall be entitled to enforce
all of its rights and remedies under this Lease, including the right to recover
rent as it becomes due. Landlord's election not to terminate this Lease pursuant
to this Section 22.4 or pursuant to any other provision of this Lease, at law or
in equity, shall not preclude Landlord from subsequently electing to terminate
this Lease or pursuing any of its other remedies.

22.5     TERMINATION. Upon the termination of this Lease, Landlord will
be entitled to recover all unpaid Rent that has accrued through the date of
termination plus the reasonable costs of performing any of Tenant's obligations

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<PAGE>   36

(other than the payment of Rent) that should have been but were not satisfied as
of the date of such termination. Landlord shall also be entitled to recover the
amounts set forth in Section 22.6 below.

22.6     REPOSSESSION AND RENTAL ACCELERATION. In the event Landlord either (a)
enters and takes possession of all or any portion of the Premises without
electing to terminate this Lease, or (b) terminates this Lease after the
occurrence and during the continuance of an Event of Default, Landlord will be
entitled to recover, not as rent or a penalty but as compensation for Landlord's
loss of the benefit of its bargain with Tenant, the difference between (i) an
amount equal to the present value of the Rent that this Lease provides Tenant
will pay for the remainder of the Term and for the balance of any then effective
extension of the Term, and (ii) the present value of the future rentals (net of
leasing commissions and other costs of reletting and refurbishing) for such
period that will be or with reasonable efforts could be collected by Landlord by
reletting all or any portion of the Premises. For purposes of determining what
could be collected by Landlord by reletting under the preceding sentence,
Landlord (i) will not be required to relet when other comparable space is
available for lease at the Building and/or the Project, and (ii) will not be
required to incur any cost to relet other than customary leasing commissions and
customary leasing concessions/allowances.

22.7     LANDLORD'S RIGHT TO PERFORM. Except as specifically provided otherwise
in this Lease, all covenants and agreements by Tenant under this Lease shall be
performed by Tenant at Tenant's sole cost and expense and without any abatement
or offset of rent. If Tenant shall fail to pay any sum of money (other than
Annual Rent) or perform any other act on its part to be paid or performed
hereunder and such failure shall continue for ten (10) days with respect to
monetary obligations (or thirty (30) days with respect to non-monetary
obligations) after Tenant's receipt of written notice thereof from Landlord,
Landlord may, without waiving or releasing Tenant from any of Tenant's
obligations, make such payment or perform such other act on behalf of Tenant.
All sums so paid by Landlord and all necessary incidental costs incurred by
Landlord in performing such other acts shall be payable by Tenant to Landlord
within ten (10) days after demand therefor, together with interest thereon at
the Default Interest Rate as additional rent.

22.8     INTEREST. If any monthly installment of Annual Rent, or any other
amount payable by Tenant hereunder is not received by Landlord by the date when
due, it shall bear interest at the Default Interest Rate set forth in Section
1.9 of the Summary from the date due until paid. All interest, and any late
charges imposed pursuant to Section 22.9 below, shall be considered additional
rent due from Tenant to Landlord under the terms of this Lease.

22.9     LATE CHARGES; RETURNED CHECKS. Tenant acknowledges that, in addition to
interest costs, the late payments by Tenant to Landlord of any Annual Rent or
other sums due under this Lease will cause Landlord to incur costs not
contemplated by this Lease, the exact amount of such costs being extremely
difficult and impractical to fix. Accordingly, if any monthly installment of
Annual Rent or any other amount payable by Tenant hereunder is not received by
Landlord by the due date thereof, and such failure shall continue for ten (10)
days after the same is due, Tenant shall pay to Landlord an additional sum of
five percent (5%) of the overdue amount as a late charge, but in no event more
than the maximum late charge allowed by law. Acceptance of a late charge or
interest shall not constitute a waiver of Tenant's default with respect to the
overdue amount or prevent Landlord from exercising any of the other rights and
remedies available to Landlord under this Lease or at law or in equity now or
hereafter in effect. In the event any check received by Landlord from Tenant in
payment of any amounts payable by Tenant hereunder is returned by Tenant's bank,
Tenant shall pay to Landlord a service charge of $25.00 for each such check upon
receipt of an invoice therefor.

22.10    RIGHTS AND REMEDIES CUMULATIVE. All rights, options and remedies of
Landlord contained in this Section 22 and elsewhere in this Lease shall be
construed and held to be cumulative, and no one of them shall be exclusive of
the other, and Landlord shall have the right to pursue any one or all of such
remedies or any other remedy or relief which may be provided by law or in
equity, whether or not stated in this Lease. Nothing in this Section 22 shall be
deemed to limit or otherwise affect Tenant's indemnification of Landlord
pursuant to any provision of this Lease

22.11    TENANT'S WAIVER OF REDEMPTION. Tenant hereby waives and surrenders for
itself and all those claiming under it, including creditors of all kinds, (a)
any right and privilege which it or any of them may have under any present or
future law to redeem any of the Premises or to have a continuance of this Lease
after termination of this Lease or of Tenant's right of occupancy or possession
pursuant to any court order or any provision hereof, and (b) the benefits of any
present or future law which exempts property from liability for debt or for
distress for rent.

                                      -33-
<PAGE>   37

23.      LANDLORD'S DEFAULT.

         (a)      Landlord shall not be deemed to be in default in the
performance of any of its obligations hereunder unless it shall fail to perform
such obligations and such failure shall continue for a period of thirty (30)
days or such additional time as is commercially reasonably required to correct
any such default after written notice has been given by Tenant to Landlord
specifying the nature of Landlord's alleged default (a "LANDLORD'S DEFAULT").
Landlord shall not be liable in any event for incidental, consequential and/or
punitive damages to Tenant by reason of any Landlord's Default, whether or not
notice is given. Tenant shall have no right to terminate this Lease as a result
of any Landlord's Default. Additionally, Tenant shall have no right to any
offset or counterclaim against Rent due hereunder as a result of any Landlord's
Default.

         (b)      Tenant may, but shall not be obligated to, cure any Landlord's
Default that would be detrimental to Tenant's use and/or occupancy of the
Premises if not cured, and whenever Tenant so elects, all costs and expenses
incurred by Tenant in curing a Landlord's Default shall be paid by Landlord to
Tenant within fifteen (15) days after Landlord's receipt of Tenant's written
demand therefor, together with lawful interest thereon from the date of payment
by Tenant to the date of payment by Landlord; provided, however, that Tenant
shall protect, defend indemnify and hold Landlord and all Landlord Parties
exempt and harmless against any damage to the Building, or any premises therein,
resulting from Tenant's effecting a cure of any Landlord's Default.

24.      SUBORDINATION, NON-DISTURBANCE.

         (a)      This Lease is subordinate to and Landlord has full authority
to subordinate the interest of Tenant to any mortgage, deed of trust or other
lien or ground or underlying lease now existing or placed from time to time upon
the Premises (and to all renewals, modifications, extensions and amendments
thereof), and Tenant will, upon receipt of a reasonable request from Landlord,
execute any subordination instruments as may be reasonably appropriate to carry
out this subparagraph; provided that (i) in such subordination documents this
Lease shall be recognized by the mortgagee or beneficiary under a deed of trust
or lessor; (ii) the rights of the Tenant shall remain in full force and effect
during the Term of this Lease so long as the Tenant shall continue to perform
all of its agreements hereunder; and (iii) no such subordination shall become
effective until and unless the holder of such mortgage or deed of trust or
lessor delivers to Tenant a non-disturbance agreement (a "NON-DISTURBANCE
AGREEMENT") which provides that, subject to Tenant's compliance with the terms
hereof and with the Non-Disturbance Agreement, such lessor or holder of such
mortgage or deed of trust will not disturb Tenant's right of occupancy of the
Premises in the event of a foreclosure of any such mortgage or deed of trust or
a termination of such ground or underlying lease. Each Non-Disturbance Agreement
shall also include Tenant's agreement to attorn and will contain such other
provisions as such holder of such mortgage or deed of trust or lessor shall
reasonably require in connection therewith and to which Tenant agrees in
writing.

         (b)      Landlord shall, within five (5) days after the Initial NDA
Delivery Date (as defined below), obtain a Non-Disturbance Agreement from First
National Bank of Athens (the "CURRENT LENDER") in the Current Lender's form, a
copy of which is attached hereto as Rider E (the "INITIAL NON-DISTURBANCE
AGREEMENT"). Upon the delivery to Tenant of multiple originals of the Initial
Non-Disturbance Agreement to be executed by the Current Lender and the other
party or parties thereto, which delivery shall take place not more than two (2)
business days after the date this Lease is executed by Landlord, Tenant shall,
within ten (10) days after Tenant's receipt of the same, execute each of the
same and return all of such originals to Landlord at Landlord's address for
notices set forth in Section 7.2 above (the date of Landlord's receipt of such
executed originals of the Initial Non-Disturbance Agreement is herein referred
to as the "INITIAL NDA DELIVERY DATE").

25.      ESTOPPEL CERTIFICATE.

25.1     TENANT'S OBLIGATIONS. Within fifteen (15) days following Landlord's
written request, Tenant shall execute and deliver to Landlord an estoppel
certificate, in a form substantially similar to the form of Exhibit C attached
hereto, certifying: (a) the Commencement Date; (b) that this Lease is unmodified
and in full force and effect (or, if modified, that this Lease is in full force
and effect as modified, and stating the date and nature of such modifications);
(c) the date to which the Rent and other sums payable under this Lease have been
paid; (d) that there are not, to the best of Tenant's knowledge, any defaults
under this Lease by either Landlord or Tenant, except as specified in such
certificate; and (e) such other matters as are set forth in Exhibit C or are
reasonably requested by

                                      -34-
<PAGE>   38

Landlord. Any such estoppel certificate delivered pursuant to this Section 25.1
may be relied upon by any mortgagee, beneficiary, purchaser or prospective
purchaser of any portion of the Premises, as well as their assignees.

25.2     TENANT'S FAILURE TO DELIVER. Tenant's failure to deliver such estoppel
certificate within such time shall be conclusive upon Tenant that: (a) this
Lease is in full force and effect without modification, except as may be
represented by Landlord; (b) there are no uncured defaults in Landlord's or
Tenant's performance (other than Tenant's failure to deliver the estoppel
certificate); and (c) not more than one (1) month's rental has been paid in
advance. If Tenant shall fail to timely deliver any estoppel certificate
required by this Lease and such failure shall continue for a period of five (5)
days after Tenant's receipt of written notice thereof, Tenant shall indemnify,
protect, defend (with counsel reasonably approved by Landlord in writing) and
hold Landlord harmless from and against any and all Claims attributable to any
failure by Tenant to timely deliver any such estoppel certificate to Landlord
pursuant to Section 25.1 above except for any claims based on the gross
negligence or intentional misrepresentation by Landlord.

26.      LEASE EXECUTION.

26.1     AUTHORITY. Tenant and the persons and/or entities executing this Lease
on behalf of Tenant represent and warrant that: (a) Tenant is a duly authorized
and existing corporation and is qualified to do business in the State of Texas;
(b) such persons and/or entities executing this Lease are duly authorized to
execute and deliver this Lease on Tenant's behalf in accordance with a duly
adopted resolution of Tenant's board of directors and/or the Tenant's by-laws;
and (c) this Lease is binding upon Tenant in accordance with its terms. Landlord
and the persons and/or entities executing this Lease on behalf of Landlord
represent and warrant that: (a) Landlord is a duly authorized and existing
partnership and is qualified to do business in the state in which the Premises
are located; (b) such persons and/or entities executing this Lease are duly
authorized to execute and deliver this Lease on Tenant's behalf in accordance
with the Tenant's partnership agreement; and (c) this Lease is binding upon
Landlord in accordance with its terms.

26.2     NO OPTION. The submission of this Lease for examination or execution by
Tenant does not constitute a reservation of or option for the Premises and this
Lease shall not become effective as a Lease until it has been executed by
Landlord and delivered to Tenant.

27.      MODIFICATION AND CURE RIGHTS OF LANDLORD'S MORTGAGEES AND LESSORS.

27.1     MODIFICATIONS. If, in connection with Landlord's obtaining or entering
into any financing or a ground lease for any portion of the Premises, the lender
or ground lessor shall request modifications to this Lease, Tenant shall, within
thirty (30) days after request therefor, execute an amendment to this Lease
including such modifications, provided such modifications are reasonable, do not
increase the obligations of Tenant hereunder, or adversely affect the leasehold
estate created hereby or Tenant's rights hereunder or Tenant's ability to
conduct its business in the Premises.

27.2     CURE RIGHTS.

         (a)      Should any mortgage or deed of trust affecting the Project be
foreclosed, or if any ground or underlying lease be terminated: (i) the
liability of the mortgagee, beneficiary or purchaser at such foreclosure sale,
or the liability of a subsequent owner designated as Landlord under this Lease,
shall exist only so long as such mortgagee, beneficiary, purchaser or owner is
the owner of the Project and such liability shall not continue or survive after
further transfer of ownership; (ii) Tenant shall be deemed to have attorned, as
Tenant under this Lease, to the purchaser at any foreclosure sale thereunder, or
if any ground or underlying lease be terminated for any reason, Tenant shall be
deemed to have attorned, as Tenant under this Lease, to the ground lessor under
the ground lease, and this Lease shall continue in force and effect as a direct
lease between and binding upon Tenant and such mortgagee or ground lessor, as
the case may be. As used in this Section, the terms "mortgagee" and
"beneficiary" shall include successors and assigns of such party, whether
immediate or remote, the purchaser of any mortgage or deed of trust, whether at
foreclosure or otherwise, and the successors, assigns and mortgagees and
beneficiaries of such purchaser, whether immediate or remote.

         (b)      In the event of any act or omission by Landlord under this
Lease which would give Tenant the right to terminate this Lease or to claim a
partial or total eviction, Tenant will not exercise any such right until:

                                      -35-
<PAGE>   39

                  (i) it has given written notice (by United States certified or
registered mail, postage prepaid) of such act or omission to Landlord (as
provided herein) and to the holder of any mortgage or deed of trust on the
Project and to the ground lessor of any ground lease of the Project (whose names
and addresses Landlord agrees will be furnished to Tenant on the earlier of a
reasonable time after such mortgage or ground lease transaction is entered into
and the actual receipt by Tenant of such name and address; provided, as a
condition to the rights of Tenant under this Section 27(b), Tenant must give
such written notice to the holder of the mortgage or deed of trust on the
Project and the ground lessor of any ground lease of the Project simultaneously
with delivery by Tenant of written notice of such act or omission to Landlord;
and

                  (ii) any such holder of any mortgage or deed of trust on the
Project, or any such ground lessor of any ground lease of the Project, shall,
following its receipt of such notice, have failed within the time period
provided to Landlord hereunder (or such additional period as may be provided for
in the respective Non-Disturbance Agreement) commence and to pursue to
completion reasonable action to remedy such act or omission; provided, however,
if such act or omission cannot be cured without possession of the Project, such
holder of any mortgage or deed of trust or such ground lessor: (1) will
immediately undertake to gain possession of the Project; and (2) shall not be
obligated to commence and to pursue reasonable action to remedy such act or
omission, until it has obtained possession of the Project pursuant to any
applicable mortgage, deed of trust or ground lease. However, in such event, if
such holder of any mortgage or deed of trust or such ground lease is unable to
take possession of the Project within sixty (60) days following the date it
undertakes to gain possession of the Project, Tenant shall be permitted to
exercise its termination rights.

28.      QUIET ENJOYMENT.

Landlord covenants and agrees with Tenant that, upon Tenant performing all of
the covenants and provisions on Tenant's part to be observed and performed under
this Lease (including payment of rent hereunder), Tenant shall and may peaceably
and quietly have, hold and enjoy the Premises in accordance with and subject to
the terms and conditions of this Lease as against all persons claiming by,
through or under Landlord.

29.      TRANSFER OF LANDLORD'S INTEREST.

The term "Landlord" as used in this Lease, so far as covenants or obligations on
the part of the Landlord are concerned, shall be limited to mean and include
only the owner or owners, at the time in question, of the fee title to, or a
lessee's interest in a ground lease of, the Building and/or Project. In the
event of any transfer or conveyance of any such title or interest (other than a
transfer for security purposes only), the transferor shall be automatically
relieved of all covenants and obligations on the part of Landlord contained in
this Lease accruing after the date of such transfer or conveyance. Landlord and
Landlord's transferees and assignees shall have the absolute right to transfer
all or any portion of their respective title and interest in the Building, the
Project and/or this Lease without the consent of Tenant, and such transfer or
subsequent transfer shall not be deemed a violation on Landlord's part of any of
the terms and conditions of this Lease.

30.      LIMITATION ON LANDLORD'S LIABILITY.

Notwithstanding anything contained in this Lease to the contrary, the
obligations of Landlord under this Lease (including any actual or alleged breach
or default by Landlord) do not constitute personal obligations of the individual
partners, members, managers, directors, officers or shareholders of Landlord or
Landlord's partners or Affiliates, and Tenant shall not seek recourse against
the individual partners, members, managers, directors, officers or shareholders
of Landlord or Landlord's partners or Affiliates, or any of their personal
assets for satisfaction of any liability with respect to this Lease. In
addition, in consideration of the benefits accruing hereunder to Tenant and
notwithstanding anything contained in this Lease to the contrary, Tenant hereby
covenants and agrees for itself and all of its successors and assigns that the
liability of Landlord for its obligations under this Lease (including any
liability as a result of any actual or alleged failure, breach or default
hereunder by Landlord), shall be limited solely to, and Tenant's and its
successors' and assigns' sole and exclusive remedy shall be against, Landlord's
interest in the Project, and no other assets of Landlord.

                                      -36-
<PAGE>   40

31.      MISCELLANEOUS.

31.1     GOVERNING LAW. This Lease shall be governed by, and construed pursuant
to, the laws of the State of Texas, without regard to the conflicts of law
principles thereof.

31.2     SUCCESSORS AND ASSIGNS. Subject to the provisions of Section 29 above,
and except as otherwise provided in this Lease, all of the covenants, conditions
and provisions of this Lease shall be binding upon, and shall inure to the
benefit of, the parties hereto and their respective heirs, personal
representatives and permitted successors and assigns; provided, however, no
rights shall inure to the benefit of any Transferee of Tenant unless the
Transfer to such Transferee is made in compliance with the provisions of Section
14.

31.3     NO MERGER. The voluntary or other surrender of this Lease by Tenant or
a mutual termination thereof shall not work as a merger and shall, at the option
of Landlord, either (a) terminate all or any existing subleases, or (b) operate
as an assignment to Landlord of Tenant's interest under any or all such
subleases.

31.4     PROFESSIONAL FEES. If either Landlord or Tenant should bring suit
against the other with respect to this Lease, including for unlawful detainer or
any other relief against the other hereunder, then all costs and expenses
incurred by the prevailing party therein (including, without limitation, its
reasonable appraisers', accountants', attorneys' and other professional fees,
expenses and court costs), shall be paid by the other party.

31.5     WAIVER. The waiver by either party of any breach by the other party of
any term, covenant or condition herein contained shall not be deemed to be a
waiver of any subsequent breach of the same or any other term, covenant and
condition herein contained, nor shall any custom or practice which may become
established between the parties in the administration of the terms hereof be
deemed a waiver of, or in any way affect, the right of any party to insist upon
the performance by the other in strict accordance with said terms. No waiver of
any default of either party hereunder shall be implied from any acceptance by
Landlord or delivery by Tenant (as the case may be) of any rent or other
payments due hereunder or any omission by the non-defaulting party to take any
action on account of such default if such default persists or is repeated, and
no express waiver shall affect defaults other than as specified in said waiver.
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.

31.6     TERMS AND HEADINGS; INTERPRETATION. Terms (including, without
limitation, the words "Landlord" and "Tenant") used herein shall include the
plural as well as the singular. Words used in any gender include other genders.
The Section headings of this Lease are not a part of this Lease and shall have
no effect upon the construction or interpretation of any part hereof.

31.7     TIME. Time is of the essence with respect to performance of every
provision of this Lease in which time or performance is a factor. All references
in this Lease to "days" shall mean calendar days unless specifically modified
herein to be "business" days. The term "business day" shall mean a day on which
banks are open for business in the State in which the Premises are located, and
shall exclude Saturdays, Sundays, and federal, state and local public holidays.

31.8     PRIOR AGREEMENTS; AMENDMENTS. This Lease, including the Summary and all
Exhibits and Riders attached hereto contains all of the covenants, provisions,
agreements, conditions and understandings between Landlord and Tenant concerning
the Premises and any other matter covered or mentioned in this Lease, and no
prior agreement or understanding, oral or written, express or implied,
pertaining to the Premises or any such other matter shall be effective for any
purpose. No provision of this Lease may be amended or added to except by an
agreement in writing signed by the parties hereto or their respective successors
in interest. The parties acknowledge that all prior agreements, representations
and negotiations are deemed superseded by the execution of this Lease to the
extent they are not expressly incorporated herein.

31.9     SEPARABILITY. The invalidity or unenforceability of any provision of
this Lease (except for Tenant's obligation to pay Rent) shall in no way affect,
impair or invalidate any other provision hereof, and such other provisions shall
remain valid and in full force and effect to the fullest extent permitted by
law.

31.10    RECORDING. Neither Landlord nor Tenant shall record this Lease. In
addition, neither party shall record a short form memorandum of this Lease
without the prior written consent (and signature on the memorandum) of the

                                      -37-
<PAGE>   41

other, and provided that prior to recordation Tenant executes and delivers to
Landlord, in recordable form, a properly acknowledged quitclaim deed or other
instrument extinguishing all of the Tenant's rights and interest in and to the
Premises, and designating Landlord as the transferee, which deed or other
instrument shall be held by Landlord and may be recorded by Landlord once this
Lease terminates or expires (but not prior thereto).

31.11    EXHIBITS AND RIDERS. All Exhibits and Riders attached to this Lease are
hereby incorporated in this Lease for all purposes as though set forth at length
herein.

31.12    ACCORD AND SATISFACTION. No payment by Tenant or receipt by Landlord of
a lesser amount than the rent payment herein stipulated shall be deemed to be
other than on account of the rent, nor shall any endorsement or statement on any
check or any letter accompanying any check or payment as rent be deemed an
accord and satisfaction, and Landlord may accept such check or payment without
prejudice to Landlord's right to recover the balance of such rent or pursue any
other remedy provided in this Lease. Tenant agrees that each of the foregoing
covenants and agreements shall be applicable to any covenant or agreement either
expressly contained in this Lease or imposed by any statute or at common law.

31.13    FINANCIAL STATEMENTS. Upon fifteen (15) days prior written request from
Landlord (which Landlord may make at any time during the Term but no more often
than once in any calendar year), Tenant shall deliver to Landlord a financial
statement of Tenant for the most recently completed fiscal quarter of Tenant.
Such statements shall be prepared in accordance with generally acceptable
accounting principles and certified as true in all material respects by an
authorized officer of Tenant. Notwithstanding the foregoing, Tenant shall have
no obligation to provide Landlord with such certified financial information with
respect to Tenant during any period of time in which Tenant is or is a
wholly-owned subsidiary of a publicly-held company in good standing with the
United States Securities and Exchange Commission with its Voting Stock being
publicly traded on the New York Stock Exchange, the American Stock Exchange or
the NASDAQ. Landlord covenants and agrees to keep the non-public financial
information of Tenant it receives during the Term strictly confidential and not
disclose the same except as follows: (a) to the extent the disclosure of the
same may be required by any applicable Law; (b) in connection with any financing
sought by Landlord, in which event Landlord will first obtain a written
agreement from the party to whom such information will be disclosed to abide by
Landlord's confidentiality obligations hereunder; (c) in connection with any
legal or arbitration proceedings related to this Lease, in which event Landlord
will first obtain a written agreement from the party to whom such information
will be disclosed to abide by Landlord's confidentiality obligations hereunder;
(d) to any prospective purchaser of all or any portion of the Project or any
interest therein or in Landlord, in which event Landlord will first obtain a
written agreement from the party to whom such information will be disclosed to
abide by Landlord's confidentiality obligations hereunder; and (e) to any
partner of Landlord and Landlord's or any such partner's officers, directors,
trustees, partners, agents, employees, attorneys, consultants, contractors or
representatives if such persons have a need to know such information and in
which event Landlord will first obtain a written agreement from the party to
whom such information will be disclosed to abide by Landlord's confidentiality
obligations hereunder. As a condition to Landlord's confidentiality obligations
under this Section, Tenant shall indicate conspicuously on any non-public
financial information of Tenant provided to Landlord, that such information is
non-public and is subject to the confidentiality requirements of this Section.

31.14    NO PARTNERSHIP. Landlord does not, in any way or for any purpose,
become a partner of Tenant in the conduct of its business, or otherwise, or
joint venturer or a member of a joint enterprise with Tenant by reason of this
Lease.

31.15    FORCE MAJEURE. In the event that either party hereto shall be delayed
or hindered in or prevented from the performance of any act required hereunder
by reason of strikes, lock-outs, labor troubles, inability to procure materials,
failure of power, governmental moratorium or other governmental action or
inaction (including failure, refusal or delay in issuing permits, approvals
and/or authorizations), injunction or court order, riots, insurrection, war,
fire, earthquake, flood or other natural disaster or other reason of a like
nature not the fault of the party delaying in performing work or doing acts
required under the terms of this Lease (but excluding delays due to financial
inability) (herein collectively, "FORCE MAJEURE DELAYS"), then performance of
such act shall be excused for the period of the delay and the period for the
performance of any such act shall be extended for a period equivalent to the
period of such delay. The provisions of this Section shall not apply to nor
operate to excuse Tenant from the payment of Rent strictly in accordance with
the terms of this Lease.

31.16    COUNTERPARTS. This Lease may be executed in one or more counterparts,
each of which shall constitute an

                                      -38-
<PAGE>   42

original and all of which shall be one and the same agreement.

31.17    NON-DISCLOSURE OF LEASE TERMS. Tenant acknowledges and agrees that the
terms of this Lease are confidential and constitute proprietary information of
Landlord. Disclosure of the terms could adversely affect the ability of Landlord
to negotiate other leases and impair Landlord's relationship with other tenants.
Accordingly, Tenant agrees that it, and its officers, directors, employees,
agents and attorneys, shall not intentionally and voluntarily disclose the terms
and conditions of this Lease to any newspaper or other publication or any other
tenant or apparent prospective tenant of the Building or other portion of the
Premises, or real estate agent, either directly or indirectly, without the prior
written consent of Landlord, provided, however, that Tenant may disclose the
terms to prospective subtenants or assignees under this Lease. Tenant and its
officers, directors, employees, agents and attorneys shall additionally have the
right to disclose the terms and conditions of this Lease as follows: (a) to the
extent disclosure of some or all of such terms, conditions or provisions may be
required by law, including, without limitation, as required by the Securities
Act of 1933, as amended, and the Securities Exchange Act of 1934, as amended;
(b) the financial terms of this Lease to the extent that the disclosure of the
same is required in connection with any financing sought by Tenant; and (c) in
connection with the enforcement of Tenant's rights hereunder. The covenants of
Tenant in this Section have been given by Tenant as a material inducement to
Landlord to lease the Premises to Tenant.

31.18    RULES AND REGULATIONS. Tenant and Tenant's agents, employees and
invitees will comply fully with all requirements of the rules and regulations
with respect to the Building, the Project and the Common Areas which are
attached hereto as Exhibit D and made a part hereof as though fully set out
herein. Landlord shall at all times have the right to change such rules and
regulations or to promulgate other reasonable rules and regulations in such
manner as may be deemed advisable for safety, care or cleanliness of the
Building and the Project and for preservation of good order therein, all of
which rules and regulations, changes and amendments will be forwarded to Tenant
in writing and shall be carried out and observed by Tenant; provided, however,
no such other rules or regulations shall materially and adversely affect the
business being conducted by Tenant at the Premises. Tenant shall further be
responsible for compliance with such rules and regulations by the employees,
servants, agents, visitors and invitees of Tenant. While all of said rules and
regulations are intended to be uniformly enforced as to all tenants and
occupants of the Project, Landlord shall not be responsible to Tenant for the
non-performance by any other tenant or occupant of the Project of any of said
rules and regulations, and the failure of such other tenant or occupant of the
Project to comply with any of said rules and regulations shall not relieve
Tenant from the obligation to comply with the same.

31.19    LANDLORD CONSENTS AND APPROVALS; INDEMNIFICATION. Except as expressly
set forth to the contrary in this Lease or any Exhibits or Riders attached
hereto, any time Landlord's consent or approval is required, Landlord may
withhold such consent or approval in Landlord's sole and absolute discretion.
Additionally, without limiting in any way Landlord's right to withhold its
consent or approval on reasonable grounds, whenever Landlord's consent or
approval is expressly required not to be unreasonably withheld or conditioned,
it is agreed that Landlord will not be acting unreasonably in refusing to give
its consent or approval to the matter Tenant is seeking to have Landlord consent
to or approve if, in Landlord's good faith opinion, such matter would (1) cause
Landlord to incur some cost or expense in connection with the leasing and/or
build-out of the remaining portions of the Building (other than any cost or
expense which Landlord would have otherwise incurred regardless of the matter
being consented to or approved) and Tenant has not offered in connection with
its requested consent to fully reimburse and/or indemnify Landlord for any such
cost or expense (such reimbursement to take place within 15 days after Tenant's
receipt of Landlord's written request therefor and amount thereof), (2)
materially and adversely affect any of the Base Building Components or any of
the systems of the Building, or (3) otherwise materially and adversely affect
the Project (including, without limitation, Landlord's ability to lease the
remaining space in the Building and/or sell the Project). Landlord acknowledges
and agrees that the fact that Tenant plans to construct such improvements to the
Initial Premises as are necessary to complete its intended data center to be
located at the Project will not, in and of itself, adversely affect the Project.
All indemnity obligations of Landlord and Tenant set forth in this Lease or any
Exhibits or Riders attached hereto shall survive the expiration or earlier
termination of this Lease.

31.21    SATELLITE DISHES AND ANTENNAE. Tenant's rights with respect to the
installation and maintenance of communication dishes and antennae on the roof of
the Building are set forth in the Exhibit E attached hereto.

31.22    TENANT'S POWER GENERATOR. Tenant's rights with respect to the
installation and maintenance of a backup generator at the Project are set forth
in the Exhibit J attached hereto.

                                      -39-
<PAGE>   43

31.23    RIGHT OF FIRST REFUSAL. Tenant's right of first refusal with respect to
a portion of the Building is set forth on the Exhibit H attached hereto.

31.24    RIGHT OF FIRST LEASE. Tenant's right of first lease with respect to a
portion of the Building is set forth on the Exhibit I attached hereto.

            [THE REMAINDER OF THIS PAGE IS INTENTIONALLY LEFT BLANK]

                                      -40-
<PAGE>   44

IN WITNESS WHEREOF, the parties have executed this Lease as of the day and year
first above written.

LANDLORD:
PRETTY M.T., L.P.,
a Delaware limited partnership
By:      PRA-JSF GP, L.P.,
         a Texas limited partnership,
         its general partner
         By: PRA GENERAL PARTNER, INC.,
                           a Texas corporation,
                           its general partner

                           By: /s/ LEON J. BACKES
                              -------------------------
                              Leon J. Backes, President

TENANT:
SPECTRUM INTEGRATED SERVICES, INC.
         d/b/a SOFTWARE SPECTRUM,
         a Texas corporation

         By: /s/ ROBERT D. GRAHAM
                  Name: Robert D. Graham
                  Title: Vice President

                                      -41-
<PAGE>   45

EXHIBITS AND RIDERS

         A        Depiction of the Premises
         B        Legal Description of the Land
         B-1      Depiction of the Common Parking Area
         B-2      Depiction of the Exclusive Parking Area
         B-3      Area Which May Not Designated as Reserved Parking
                  Spaces for Other Tenants or
                  Parties.
         C        Sample Form of Tenant Estoppel Certificate
         D        Rules and Regulations
         E        Satellite Dish/Antenna
         F        Arbitration Provisions
         G        Tenant's Sign
         G-1      Tenant's Sign - Panel on Pylon Sign
         G-2      Tenant's Sign - Sign on Building
         G-3      Tenant's Sign - Directional Monument Sign
         H        Tenant's Continuing Rights of First Refusal
         H-1      Depiction of the Right of First Refusal Space
         I        Tenant's Right of First Lease
         I-1      Depiction of the Right of First Lease Space
         J        Tenant's Power Generator
         K        Shell Improvements
         L        Work Letter

                  Rider A           Letter of Prohibited Companies
                  Rider B           Satellite Dish Area
                  Rider C           Location of the Generator Pad
                  Rider D           Currently Anticipated Personnel
                  Rider E           Initial SNDA

                                      -42-
<PAGE>   46

                                    EXHIBIT A

                        DEPICTION OF THE INITIAL PREMISES

                                  See attached

[A sketch showing the entire building, shaded to show the premises, is
attached.]

                                      -43-
<PAGE>   47

                                   EXHIBIT A-1

     DEPICTION OF THE PORTION OF THE INITIAL PREMISES - COMMENCEMENT DATE OF
                                [AUGUST 1, 2000]

                                  See attached

[A sketch showing the premises, shaded to show portion 1 of the premises,
is attached.]

                                      -44-
<PAGE>   48

                                   EXHIBIT A-2

 DEPICTION OF THE PORTION OF THE INITIAL PREMISES - COMMENCEMENT DATE OF
                               [OCTOBER 15, 2000]

                                  See attached

   [A sketch of the premises, shaded to show portions 1 and 2 of the premises
                    and highlighting portion 2, is attached]

                                      -45-
<PAGE>   49

                                   EXHIBIT A-3

    DEPICTION OF THE PORTION OF THE INITIAL PREMISES - COMMENCEMENT DATE OF
                              [FEBRUARY 15, 2000]

                                  See attached

 [A sketch of the premises, shaded to show portions 1, 2 and 3 of the premises
                    and highlighting portion 3, is attached]

                                      -46-
<PAGE>   50

                                    EXHIBIT B

                          LEGAL DESCRIPTION OF THE LAND

                         See attached legal description

Being all that certain 17.3501 acre tract of land situated in the J.M. VanDusen
Survey, Abstract No. 1588, City of North Richland Hills, Tarrant County, Texas,
same being a part of Lot 1R of Block 1 of the TAPP ADDITION, an addition to the
City of North Richland Hills, according to the replat thereof recorded in Volume
388-166, Page 41 of the plat Records of Tarrant County, Texas and being more
particularly described by metes and bounds as follows:

Beginning at a pk nail found at the intersection of the west line of Rufe Snow
Drive, a 120 foot wide right-of-way, with the south line of Hilltop Drive, a 50
foot wide right-of-way, same being on the east line of said Lot 1R at the
Southeast corner of that certain tract of land out of said Lot 1R conveyed to
the City of North Richland Hills for right-of-way purposes which is described in
an instrument recorded in Volume 7897, Page 1502 and Volume 7929, Page 692 of
the Tarrant County Deed Records, and from which the northeast corner of said Lot
1R, bears North 00 degrees 04 minutes 08 seconds West, a distance of 13.06 feet;

Thence departing the south line of said Hilltop Drive, along the east line of
said Lot 1R and the west line of said Rufe Snow Drive, South 00 degrees 04
minutes 08 seconds East, a distance of 5.36 feet to a 1/2 inch iron rod found
for corner at common corner of said Lot 1R and the northeast corner of Lot 2R of
Block 1 of said replat of the TAPP ADDITION, recorded in Volume 388-166, Page
41; Tarrant County Plat Records;

Thence departing said Rufe Snow Drive, along the north line of said Lot 2R,
North 89 degrees 40 minutes 43 seconds West, a distance of 197.00 feet to a pk
nail found for corner at a common corner of said Lot 1R and the northwest corner
of said Lot 2R.

Thence along an east line of said Lot 1R, South 00 degrees 04 minutes 08 seconds
East, passing the southwest corner of said Lot 2R and the northwest corner of
Lot 3R-1 of Block 1 of said Replat of the TAPP ADDITION, recorded in Volume
388-166, Page 41, Tarrant County Plat Records, and continuing a total distance
of 326.31 feet to an "x" found in concrete at a common corner of said Lot 1R and
the southwest corner of said Lot 3R-1, same being on the north line on Lot 4R of
Block 1 of a replat of the TAPP ADDITION, an addition to the City of North
Richland Hills, according to the plat thereof recorded in Volume 388-153, Page
31 of the Plat Records of Tarrant County, Texas;

Thence along the common lines of said Lot 1R and said Lot 4R the following
courses and distances numbered (4) through (8):(4) North 89 degrees 40 minutes
43 seconds West, a distance of 7.00 feet to an "x" found in concrete for a
common corner of said Lot 1R and the northwest corner of said Lot 4R;

(5) South 00 degrees 04 minutes 08 seconds East, a distance of 155.76 feet to a
pk nail found for a common corner of said Lot 1R and the southwest corner of
said Lot 4R, same being at the beginning of a non-tangent curve to the left;

(6) 56.57 feet along the arc of said curve to the left, having a radius of
110.00 feet, a delta angle of 29 degrees 27 minutes 51 seconds and a chord which
bears South 74 degrees 56 minutes 47 seconds East, a distance of 55.95 feet to a
pk nail found for corner at the point of tangency;

(7) South 89 degrees 40 minutes 43 seconds East, a distance of 140.00 feet to a
1/2 inch iron rod found for corner at a common corner of said Lot 1R and the
southerly southeast corner of said Lot 4R;

(8) North 45 degrees 07 minutes 35 seconds East, a distance of 14.08 feet to a
5/8 inch iron rod found at a common corner of said Lot 1R and the easterly
southeast corner of said Lot 4R, same being on the west line of aforesaid Rufe
Snow Drive;

Thence departing said Lot 4R, along an east line of said Lot 1R and the west
line of said Rufe Snow Drive, South 00 degrees 04 minutes 08 seconds East, a
distance of 60.00 feet to an "X" found in concrete at a common corner of said
Lot 1R and the northeast corner of Lot 5 of Block 1 of the TAPP ADDITION, an
addition to the City of North Richland Hills, according

                                  (Continued)

                                      -47-
<PAGE>   51
to the plat thereof recorded in Volume 388-150, Page 3 of the Tarrant County
Plat Records;

Thence departing said Rufe Snow Drive, along the common lines of said Lot 1R and
said Lot 5, the following courses and distances numbered (10) and (11):

(10) North 89 degrees 40 minutes 43 seconds West, a distance of 150.00 feet to a
pk nail found for corner at the point of curvature of a curve to the right;

(11) 55.15 feet along the arc of said curve to the right, having a radius of
160.00 feet, a delta angle of 19 degrees 44 minutes 56 seconds and a chord which
bears, North 79 degrees 48 minutes 15 seconds West, a distance of 54.88 feet to
a pk nail found for a common corner of said Lot 1R and the northwest corner of
said Lot 5;

Thence South 00 degrees 04 minutes 08 seconds East, passing the southwest corner
of said Lot 5 and the northwest corner of Lot 6 of Block 1 of said TAPP
ADDITION, recorded in Volume 388-150, Page 3 of the Tarrant County Plat Records,
and continuing on a total distance of 290.14 feet to a pk nail found for a
common corner of said Lot 1R and the southeast corner of said Lot 6;

Thence along a common line of said Lot 1R and said Lot 6, South 89 degrees 40
minutes 43 seconds East, a distance of 204.00 feet to a pk. nail found for the
common corner of said Lot 1R and the southeast corner of said Lot 6, same being
on the west line of aforesaid Rufe Snow Drive;

Thence along the east line of said Lot 1R and the west line of said Rufe Snow
Drive, South 00 degrees 04 minutes 08 seconds East, a distance of 42.52 feet to
a 1/2 inch iron rod found for corner at the southeast corner of said Lot 1R,
same being at the intersection of west line of said Rufe Snow Drive and the
north line of Combs Road, a 50 foot right-of-way;

Thence departing said Rufe Snow Drive, along the north line said Combs Road,
West, a distance of 1040.53 feet to a 1/2 inch iron rod for corner at the
southwest corner of said Lot 1R;

Thence departing said Combs Road, along a west line of said Lot 1R, North 00
degrees 15 minutes 03 seconds West, a distance of 589.82 feet to a 1/2 inch iron
rod found for a common corner of said Lot 1R and the southeast corner of Lot 1
of block 2 of said TAPP ADDITION, recorded in Volume 388-150, Page 3, Tarrant
County Plat Records;

Thence along the common line said Lot 1R, Block 1 and said Lot 1, Block 2, North
00 degrees 37 minutes 59 seconds West, a distance of 285.12 feet to a 1/2 inch
iron rod found for corner on the south line of aforesaid Hilltop Drive, same
being the southeast corner of that tract of land conveyed to the City of North
Richland Hills for right-of-way purposes by instrument recorded in Volume 7897,
Page 1507, Tarrant County Deed Records, and being the southwest corner of the
aforesaid tract of land out of said Lot 1R conveyed to the City of North
Richland Hills by instrument recorded in Volume 7897, Page 1502 and Volume 7929,
Page 692, Tarrant County Deed Records;

Thence along the south line of said Hilltop Drive, East, a distance of 1045.21
feet to the POINT OR PLACE OF BEGINNING and CONTAINING 17.3501 ACRES OF LAND,
more or less.

                                      -48-
<PAGE>   52
A tract or parcel of land situated in the J.M. Van Dusen Survey, Abstract No.
1588 in the City of North Richland Hills, Tarrant County, Texas, and being a
part of that property conveyed to Rufe Snow / Loop 820, a Texas general
partnership composed of Stanley M. Peskind and Lawrence R. Burk by deed recorded
in Volume 8780, Page 824, Deed Records, Tarrant County, Texas, more particularly
described as follows:

BEGINNING at a 1/2" iron rod found for corner at in the north line of Combs Road
(a 50' right-of-way), said rod being the southwest corner of Lots 1-6, Block 1,
Tapp Addition, an addition to the City of North Richland Hills as recorded in
Volume 388-150, Page 8, Plat Records, Tarrant County, Texas;

THENCE South 90'00'O0" West along the north line of said Combs Road for a
distance of 295.05 feet to a 1/2" iron rod with yellow plastic cap stamped "RLG"
set for corner;

THENCE North 00'15'O3" West, departing the north line of said Combs Road for a
distance of 588.82 feet to a 1/2", iron rod with yellow plastic cap stamped
"RLG" set for corner in the south line of Lot 7; Block 2, Tapp Addition, an
addition to the City of North Richland Hills as recorded in Volume 388-159, Page
78, Plat Records, Tarrant County, Texas;

THENCE North 89'57'57" East along the south line of said Lot 1, Block 2 for a
distance of 295.05 feet to a 1/2" iron rod found for corner at the southeast
corner of said Lot 1, Block 2, said rod also being in the west line of said Lots
1-6, Block 1;

THENCE South 00'15'03" East along the west line of said Lots 1-6, Block 1 for a
distance of 589.00 feet to the POINT OF BEGINNING and containing 173,755 square
feet or 3.9889 acres, more or less.

                                      -49-
<PAGE>   53

                                   EXHIBIT B 1

                      DEPICTION OF THE COMMON PARKING AREA

                                  See attached

  [A drawing of the common parking area surrounding the building is attached.]

                                      -50-
<PAGE>   54

                                   EXHIBIT B-2

                     DEPICTION OF THE EXCLUSIVE PARKING AREA

                                  See attached

[A part of the drawing showing the parking area is blown-up here to show the
areas in which Software Spectrum has exclusive parking rights.]

                                      -51-
<PAGE>   55

                                   EXHIBIT B-2

                        AREA WHICH MAY NOT DESIGNATED AS
              RESERVED PARKING SPACES FOR OTHER TENANTS OR PARTIES

                                  See attached

[A part of the drawing showing the parking area is blown-up here to show the
areas in which the landlord will not give other tenants exclusive parking.]

                                      -52-
<PAGE>   56

                                    EXHIBIT C

                   SAMPLE FORM OF TENANT ESTOPPEL CERTIFICATE

The undersigned ("Tenant") hereby certifies to _______________("Landlord"),
and as follows:

1. Attached hereto is a true, correct and complete copy of that certain Lease
dated ____________, by and between Landlord and Tenant (the "Lease"), which
demises Premises which are located at 5201 Rufe Snow, North Richland Hills,
Texas. The Lease is now in full force and effect and has not been amended,
modified or supplemented, except as set forth in Section 6 below.

2. The term of the Lease commenced on [_________________________].

3. The term of the Lease is currently scheduled to expire on ____________.

4. Tenant has no option to renew or extend the term of the Lease except:
__________________.

5. Tenant has no preferential right to purchase the Premises.

6. The Lease has: (Initial One)

   [ ]      not been amended, modified, supplemented, extended, renewed or
            assigned.

   [ ]      been amended, modified, supplemented, extended, renewed or
            assigned by the following described agreements, copies of
            which are attached hereto:

7. Tenant has accepted and is now in possession of the Premises and has not
sublet, assigned or encumbered the Lease, the Premises or any portion thereof
except as follows: __________________.

8. The current monthly Rent is $____________________.

9. The amount of security deposit (if any) is $________________________.  No
other security deposits have been made.

10. All rental payments payable by Tenant have been paid in full through
_____________ as of the date hereof. No rent under the Lease has been paid for
more than thirty (30) days in advance of its due date.

11. All work required to be performed by Landlord under the Lease has been
completed and has been accepted by Tenant, and all tenant improvement allowances
have been paid in full.

12. To the best of Tenant's knowledge, as of the date hereof, there are no
defaults on the part of Landlord or Tenant under the Lease except as follows:
____________________________________.

13. Tenant has no defense as to its obligations under the Lease and claims no
set-off or counterclaim against Landlord.

14. Tenant has no right to any concession (rental or otherwise) or similar
compensation in connection with renting the space it occupies, except as
expressly provided in the Lease.

15. All insurance required of Tenant under the Lease has been provided by Tenant
and all premiums have been paid.

16. There has not been filed by or, to the best of Tenant's knowledge,
information and belief, against Tenant a petition in bankruptcy, voluntary or
otherwise, any assignment for the benefit of creditors, any petition seeking
reorganization or arrangement under the bankruptcy laws of the United States or
any state thereof, or any other action brought pursuant to such bankruptcy laws
with respect to Tenant.

17. Tenant pays rent due Landlord under the Lease to Landlord and does not have
any knowledge of any other person who has any right to such rents by collateral
assignment or otherwise.

The foregoing certification is made with the knowledge that _______________ is
about to [fund a loan to Landlord or purchase the Premises from Landlord], and
that _______________ is relying upon the representations herein made in [funding
such loan or purchasing the Premises].

                                      -53-
<PAGE>   57

Dated:                             .
     ------------------------------

"TENANT"

[                                      ]
---------------------------------------
By
Name:
Title:

                         SAMPLE ONLY (NOT FOR EXECUTION)

                                      -54-
<PAGE>   58

                                    EXHIBIT D

                              RULES AND REGULATIONS

1.       Landlord agrees to furnish Tenant with three (3) keys to the Premises
without charge. Additional keys will be furnished at a nominal charge. Tenant
shall not change locks or install additional locks on doors without prior
written consent of Landlord. Tenant shall not make or cause to be made
duplicates of keys procured from Landlord without prior written approval of
Landlord. All keys to the Premises shall be surrendered to Landlord upon
termination of this Lease.

2.       Tenant will refer all contractors rendering any service on or to the
Premises for Tenant to Landlord for Landlord's approval before performance of
any contractual service, which approval will not be unreasonably withheld,
conditioned or delayed. Tenant's contractors shall comply with Landlord's
reasonable rules and regulations pertaining to construction and installation.
This provision shall apply to all work performed to the Premises, including
installation of electrical devices and attachments and installations of any
nature affecting floors, walls, woodwork, trim, windows, ceilings and equipment
or any other physical portion of the Premises or the Project. The foregoing
shall not apply to any work done to Tenant's Property or Tenant's Customer's
Property or to services provided to Tenant or Tenant's customer's as long as
such work or services will not affect the Building and/or the Premises.

3.       Tenant shall not at any time occupy any part of the Premises as
sleeping or lodging quarters.

4.       Tenant shall not place, install or operate on the Premises or in any
part of the Project any engine, stove or machinery, or conduct mechanical
operations or cook thereon or therein, or place or use in or about the Premises
or the Project any explosives, gasoline, kerosene, oil, acids, caustics, or any
flammable, explosive or hazardous material without written consent of Landlord;
provided, however, the foregoing shall not apply to Tenant's generator,
associated fuel tanks or UPS battery backup systems or to any Tenant Changes or
to the computer or telecommunications equipment operated by Tenant or its
customers on the Premises; and further provided that Tenant shall be permitted
to maintain break areas in the Premises for its employees and invitees which may
include refrigerators, microwave ovens, vending machines, coffee makers and
similar office cooking equipment.

5.       Landlord will not be responsible for lost or stolen merchandise, trade
fixtures, furniture, furnishings, personal property, equipment, money or jewelry
from the Premises or the Project regardless of whether such loss occurs when the
area is locked against entry.

6.       No dogs, cats, fowl or other animals shall be brought into or kept in
or about the Premises or Property.

7.       Employees of Landlord shall not receive or carry messages for or to any
Tenant or other person or contract with or render free or paid services to any
Tenant or to any of Tenant's agents, employees or invitees.

8.       The water closets and other water fixtures shall not be used for any
purpose other than those for which they were constructed, and any damage
resulting to them from misuse or by the defacing or injury of any part of the
Project shall be borne by the person who shall occasion it. No person shall
waste water by interfering with the faucets or otherwise.

9.       No person shall disturb occupants of the Project by the use of any
radios, record players, tape recorders, musical instruments, the making of
unseemly noises or any unreasonable use.

10.      Nothing shall be thrown out of the windows of the Project or down the
stairways or other passages.

11.      Tenant and its employees, agents and invitees shall park their vehicles
only in the Common Parking Area, the Exclusive Parking Area or, as to visitors
of Tenant, in the Visitor Parking Area. Tenant shall furnish Landlord with state
automobile license numbers of Tenant's vehicles and its employees' vehicles
within thirty (30) days after taking possession of the Premises and shall notify
Landlord of any changes within thirty (30) days after such change occurs with
respect to vehicles regularly using the Common Parking Area. Tenant shall not
leave any vehicle in a state of disrepair (including without limitation, flat
tires) on the Premises or on the Project for longer than a commercially
reasonable period as may be required to arrange for removal of such vehicles. If
Tenant or its employees, agents or invitees (i) park their vehicles in areas
other than the Common Parking Area, the Exclusive Parking Area or, as to
visitors of Tenant, the Visitor Parking Area, or (ii) leave any vehicle in a
state of disrepair, Landlord, after giving two (2) business days written notice
to Tenant of such violation, shall have the right to remove such vehicles at
Tenant's expense.

12.      Parking in the Common Parking Area shall be in compliance with all
parking rules and regulations including any

                                      -55-
<PAGE>   59

sticker or other identification system established by Landlord and communicated
to Tenant in writing. Failure to observe the rules and regulations may result in
a termination of Tenant's right to use the parking or area and may subject the
vehicle in violation of the parking rules and regulations to removal and
impoundment. No termination of parking privileges or removal or impoundment of a
vehicle shall create any liability on Landlord or be deemed to interfere with
Tenant's right to possession of its Premises. Vehicles must be parked entirely
within the stall lines and all direction signs, arrows and posted speed limits
must be observed. Parking is prohibited in areas not striped for parking, in
areas marked "2 HOUR VISITOR PARKING" (except by visitors), in aisles, where "No
Parking" signs are posted, on ramps, in cross hatched areas, and in other areas
as may be designated by Landlord. Parking stickers or other forms of
identification supplied by Landlord shall remain the property of Landlord and
not the property of Tenant and are not transferable. Every person is required to
park and lock his or her vehicle. All responsibility for damage to vehicles or
persons is assumed by the owner of the vehicle or its driver.

13.      Tenant assumes, and shall indemnify Landlord against, all risks and
claims of damage to persons and properties arising in connection with any
movement in or out of the Building of furniture, office supplies and equipment.

14.      The use of cement or other similar adhesive materials in laying floor
coverings within the Premises that are not easily removed with water is
expressly prohibited.

15.      Tenant agrees to use reasonable efforts to alert Landlord to any
instance of canvassing, soliciting and peddling within the Project.

16.      If any governmental license or permit shall be required for the proper
and lawful conduct of Tenant's business, Tenant, before occupying the Premises
shall procure and maintain such license or permit and submit it for Landlord's
inspection. Tenant shall at all times comply with the terms of any such license
or permit.

17.      Except with the prior written consent of Landlord, Tenant shall not
sell or permit the sale from the Premises of, or use, or permit the use of any
sidewalk or mail area adjacent to the Premises for the sale of newspapers,
magazines, periodicals, theater tickets or any other goods or merchandise, nor
shall Tenant carry on, or permit or allow any employee or other person to carry
on, business in or from the Premises for the service or accommodation of
occupants of any other portion of the Building, nor shall the Premises be used
for manufacturing of any kind, or for any business or activity other than that
specifically provided for in Tenant's lease. The foregoing shall not apply with
respect to Tenant's provision of co-location services and other
telecommunications services for its customers and shall not apply with respect
to Tenant's arrangement of third-parties to provide benefits to its employees
(including, for example and without limitation, provision of on-site chair
massage).

18.      Tenant shall not install any radio or television antenna, loudspeaker
or other device on the exterior walls or roof of the Building except as
permitted in the Lease.

19.      Tenant shall not use in any space, or in the Common Areas of the
Building, any hand trucks except those equipped with rubber tires and side
guards or such other material handling equipment as Landlord may approve. No
other vehicles of any kind shall be brought by Tenant into the Building or kept
in or about the Premises without prior written approval of Landlord.

20.      Tenant shall store all its trash and garbage within the Premises until
daily removal of same by janitorial service to such location in the Building as
may be designated from time to time by Landlord. No material shall be placed in
the Building trash boxes or receptacles if such material is of such nature that
it may not be disposed of in the ordinary and customary manner of removing and
disposing of trash and garbage in the city in which the Premises is located
without being in violation of any law or ordinance governing such disposal.

21.      As used in the Lease, "business days" means Monday through Saturday
(except holidays); "regular hours" means 7:00 a.m. to 6:00 p.m. on weekdays and
9:00 a.m. to 1:00 p.m. on Saturdays; and "holidays" means New Years Day,
Memorial Day, Fourth of July, Labor Day, Thanksgiving Day and Christmas Day,
together with such other holidays designated by Landlord consistent with those
holidays designated by landlords of comparable office buildings located in the
county in which the Building is located.

22.      Landlord desires to maintain the Project in the highest standard of
dignity and good taste consistent with comfort and convenience for Tenants. Any
action or condition not meeting this high standard should be reported directly
to Landlord. Your cooperation will be mutually beneficial and sincerely
appreciated. Subject to the terms and conditions of the Lease, Landlord reserves
the right to make such other and further reasonable rules and regulations as in
its judgment may from time to time be necessary, for the safety, care and
cleanliness of the Premises and the Project and for the

                                      -56-
<PAGE>   60

preservation of good order therein and Tenant agrees to abide by such rules and
regulations that are communicated to Tenant in writing.

                                      -57-
<PAGE>   61

                                    EXHIBIT E

                             SATELLITE DISH/ANTENNA

         1. Provided that Tenant complies with the terms of this Exhibit, Tenant
may, at its risk and expense, install the Satellite Dish (as hereinafter
defined) on the roof of the Building in the area depicted in the Rider B
attached to the Lease (the "SATELLITE DISH AREA"), which Satellite Dish Area
shall contain approximately 1,000 square feet of space. As used herein, the term
"SATELLITE DISH" shall mean each satellite dish or other antenna or dish or
telecommunications equipment and related wiring and equipment approved in
writing by Landlord to be located in the Satellite Dish Area, and the term
"SATELLITE DISHES" shall collectively refer to all of the foregoing. Satellite
Dishes may only be used by Tenant and any Permitted Transferee of all of
Tenant's interest in the Lease or a Permitted Transferee subleasing all or any
part of the Premises and their respective customers in the operation of their
respective businesses in the Premises. Satellite Dishes shall not be used for or
on behalf of any persons or entities other than Tenant or any Permitted
Transferee identified in the immediately preceding sentence and Tenant's and
such Permitted Transferee's customers (i.e., Satellite Dishes shall not be used
for any commercial or other for-profit use unrelated to such businesses). If
the Satellite Dish is not owned by Tenant or a Permitted Transferee then
occupying all or any portion of the Premises, Tenant or such Permitted
Transferee shall, prior to the installation of any Satellite Dish, deliver to
Landlord a written acknowledgment by the owner of the applicable Satellite Dish
of Landlord's rights under this Exhibit. Prior to installing a Satellite Dish in
the Satellite Dish Area, Tenant shall submit to Landlord for its approval plans
and specifications which (1) specify in reasonable detail the design, location
and size of the applicable Satellite Dish, and (2) are sufficiently detailed to
allow for the installation of the applicable Satellite Dish in a good and
workmanlike manner and in accordance with all Laws applicable thereto
(collectively, the "SD LEGAL REQUIREMENTS"). Prior to installing a Satellite
Dish in the Satellite Dish Area, Tenant must also satisfy the following
conditions precedent: (a) Tenant shall have obtained the written approval of
Landlord required by the preceding sentence; (b) Tenant shall have obtained and
be maintaining all permits and/or approvals required by applicable Laws with
respect to the installation, maintenance and operation of the applicable
Satellite Dish and shall have provided Landlord with sufficient evidence of the
existence of such permits and/or approvals and that the installation of such
Satellite Dish planned by Tenant will comply in all respects with the SD Legal
Requirements; and (c) Tenant shall have furnished Landlord, in the form and
content required by Section 20 of the Lease, with evidence of the insurance that
Tenant is obligated to furnish to Landlord pursuant to Section 20 of the Lease.
Landlord's approval of any plans and specifications related to the installation
of a Satellite Dish shall create no responsibility or liability on the part of
Landlord for the completeness, design or sufficiency of such plans and
specifications, or the compliance of the same or the applicable Satellite Dish
with the SD Legal Requirements. If Tenant satisfies the conditions precedent set
forth above, Tenant shall install (in a good and workmanlike manner), maintain
and use the applicable Satellite Dish in accordance with all SD Legal
Requirements. Tenant will make no penetration through the roof of the Building
without Landlord's prior written consent (which consent shall not be
unreasonably withheld or delayed). After installing a Satellite Dish, Tenant
shall maintain all permits necessary for the maintenance and operation of the
applicable Satellite Dish while it is on the roof of the Building and operate
and maintain such Satellite Dish in such a manner so as not to unreasonably
interfere with (i) any other satellite, antennae, or other transmission facility
on the Building's roof, in the Building or otherwise at the Project, and (ii)
the use or occupancy of space at the Project by any other tenants or occupants
of such space (the interference described in this sentence is herein referred to
as "INTERFERENCE"). Copies of all such permits and evidence of such consents
must be submitted to Landlord as soon as practicable after Tenant obtains the
same.

         2. If, in Landlord's judgement reasonably exercised, a Satellite Dish
has caused Interference and such Interference did not arise merely as a result
of the existence of the applicable Satellite Dish at the time of Landlord's
leasing space to another tenant at the Project or Landlord's granting rights to
a third party on the roof of the Building or otherwise at the Project, Landlord
shall provide Tenant with written notice thereof and Tenant shall promptly begin
taking actions to prevent the applicable Interference and shall in any event end
such Interference within a commercially reasonable time period after Tenant's
receipt of such written notice. If Tenant has failed to promptly begin taking
actions to prevent the applicable Interference and/or failed to end such
Interference within such time period, Landlord shall have the right, in addition
to any and all other remedies available to it under this Exhibit and the Lease,
to require that Tenant remove the Satellite Dish causing such Interference by
giving Tenant written notice thereof, which removal by Tenant shall be completed
in accordance with paragraph 4 below and within thirty (30) days after Tenant's
receipt of such written removal notice. Tenant acknowledges and agrees that
continuing Interference may cause irreparable injury and, therefore, Landlord
shall additionally have the right to bring an action to enjoin such
Interference. Landlord acknowledges and agrees that if another tenant at the
Project and/or another user of the roof of the Building seeks to install or
actually installs a satellite dish or other antenna Or dish or
telecommunications equipment and a Satellite Dish interferes with such tenant's
or user's property, such interference will not constitute Interference for the
purposes of this paragraph.

         3. Landlord may require that Tenant screen each Satellite Dish with a
parapet or other screening device

                                      -58-
<PAGE>   62

acceptable to Landlord. If Landlord does elect to require that Tenant screen a
Satellite Dish (whether at the time of the installation thereof or at any time
thereafter), Tenant shall promptly complete such screening work and in no event
shall such work fail to be completed within 30 days after Landlord's election to
require such screening. Tenant shall maintain each Satellite Dish and screening
device in good repair and condition.

         4. Tenant shall, at its risk and expense, remove all Satellite Dishes
(including all wiring and/or cabling related thereto) from the Project within
thirty (30) days after the proper termination of the Lease by Tenant or Landlord
(other than a termination of the Lease by Landlord following the occurrence and
during the continuance of an Event of Default). Tenant shall, at its risk and
expense on or before the date of the expiration of the Term or any proper
termination of the Lease or Tenant's right to possess the Premises following the
occurrence and during the continuance of an Event of Default, remove all
Satellite Dishes (including all wiring and/or cabling related thereto) from the
Project. If Tenant fails to remove any Satellite Dish as required by the
preceding 2 sentences or by paragraph 2 above, the applicable Satellite Dish
shall become the property of Landlord and Landlord (and its agents, employees or
contractors) may remove such Satellite Dish and store or dispose of it in any
manner Landlord deems appropriate without liability to Tenant. Tenant shall,
within ten (10) days after Tenant's receipt of Landlord's written request for
the following reimbursement, reimburse Landlord for all costs incurred by
Landlord in connection with any removal of the applicable Satellite Dish by
Landlord or its agents, employees or contractors that is permitted by this
Exhibit. Prior to any removal of a Satellite Dish by or on behalf of Tenant (but
excluding any removal of a Satellite Dish by Landlord or its agent, employee or
contractor), Tenant shall (i) obtain Landlord's written approval (which approval
shall not be unreasonably withheld or delayed) to the plans related to the same
(Landlord's approval of such plans shall create no responsibility or liability
on the part of Landlord for the completeness, design or sufficiency of such
plans), (ii) obtain and maintain all permits and/or approvals required by the SD
Legal Requirements with respect to the removal of the applicable Satellite Dish
and provide Landlord with sufficient evidence of the existence of such permits
and/or approvals and that the removal of such Satellite Dish planned by Tenant
will comply in all respects with all SD Legal Requirements, and (iii) furnish
Landlord with the written evidence of insurance that Tenant is obligated to
furnish to Landlord pursuant to Section 20 of the Lease. Tenant shall repair any
damage to the Building and/or Project caused by or relating to a Satellite Dish
(including, without limitation, any damage caused by its installation,
maintenance, use, or removal of the applicable Satellite Dish) and restore the
roof of the Building to its condition existing before the installation of the
applicable Satellite Dish. Notwithstanding the foregoing, Tenant shall have the
right to offer any and all Satellite Dishes that have been erected on the
Premises in accordance with this Exhibit E for transfer (through sale or
otherwise) to the Landlord or to any tenant leasing the Premises following the
termination of this Lease. If the Landlord or any such tenant accepts such a
transfer of the Satellite Dishes, Tenant shall have no removal obligations with
respect thereto.

         5. Tenant shall protect, defend, indemnify and hold harmless Landlord
and all Landlord Indemnified Parties from all Claims resulting from and/or
arising in connection with or related to the installation, maintenance, use, or
removal of each Satellite Dish by Tenant, its agents or contractors or, if
permitted by this Exhibit, the removal of any Satellite Dish by Landlord, its
agents, employees or contractors, INCLUDING THOSE ARISING FROM THE NEGLIGENCE OF
LANDLORD OR ANY LANDLORD INDEMNIFIED PARTIES, except to the extent that the
Claim in question was caused by Landlord's or its agents', employees' or
contractors' sole or gross negligence or willful misconduct. All work relating
to a Satellite Dish shall, at Tenant's expense, be coordinated with Landlord's
roofing contractor so as not to adversely affect any warranty for the Building's
roof Except as otherwise set forth in this Exhibit, there shall be no charge to
Tenant for its use of the roof of the Building for any of the Satellite Dishes.
All additional equipment and work related to any Satellite Dish shall be located
in the Premises or the Satellite Dish Area, unless an alternate location within
or on top of the Building is approved by Landlord. If Landlord allows such
additional equipment to be located outside of the Premises or the Satellite Dish
Area, Tenant and Landlord shall mutually agree upon a reasonable rental for
space occupied by such equipment. Subject to Landlord's rules and regulations
related thereto that are communicated to Tenant in writing from time to time,
Tenant and its contractors shall have reasonable access to each Satellite Dish
and related equipment for the purposes of servicing, repairing, or otherwise
maintaining the same.

         6. The indemnification of Landlord and Landlord Indemnified Parties in
the preceding paragraph and the obligations of Tenant with respect to the
removal of each Satellite Dish from the roof of the Building and the Project
shall survive the expiration of the Term and any earlier termination of the
Lease.

                                      -59-
<PAGE>   63

                                    EXHIBIT F

                             ARBITRATION PROVISIONS

Any controversy or claim arising out of or relating to the Lease which involves
less than $50,000.00 or which relates to an unreasonable denial, delay or
conditioning of any consent or approval not to have been unreasonably withheld,
delayed or conditioned (the foregoing claims or controversies together with
matters specifically identified in the Lease as a claim to be submitted for
resolution by binding arbitration are herein referred to as "CLAIMS SUBJECT TO
ARBITRATION") shall be settled by arbitration administered by the American
Arbitration Association (the "AAA") under its Commercial Arbitration Rules (the
"Rules"), and judgment upon the award rendered by the arbitrators may be entered
in any court having jurisdiction thereof. Landlord and Tenant agree as follows:
(1) all Claims Subject to Arbitration shall be submitted to arbitration (using
one arbitrator selected by the AAA or, if requested by either party, three
arbitrators selected as provided below) administered by the AAA under the Rules;
and (2) both Landlord and Tenant will abide by and perform any award rendered by
the arbitrators. The arbitrators shall have the right to award any form of
relief permitted to be awarded by any court of law having jurisdiction. Any
decision or award by the arbitrators shall be enforceable in any court having
jurisdiction.

In the event of a need for the submission of any Claims Subject to Arbitration
to arbitration, the initiating party shall (1) give written notice to the other
party of its intention to arbitrate, which notice must contain a statement
setting forth the nature of the dispute, the amount involved, if any, the remedy
sought, and the hearing locale requested, and (2) file at any regional office of
the AAA three copies of such written notice, three copies of the applicable
arbitration provisions of the Lease, and the appropriate filing fee as provided
by the Rules. Within fifteen (15) days after the non-initiating party has
received notice of such filing, the AAA shall appoint one arbitrator, unless
either party has given notice of its election to have three arbitrators hear the
matter, in which case Landlord and Tenant each may appoint one arbitrator by
identifying such appointed arbitrator in a written notice delivered to the other
party and filing such written notice at the appropriate regional office of the
AAA within such fifteen (15) day period. If either Landlord or Tenant fails to
so appoint an arbitrator, the AAA shall, as provided in the Rules, appoint the
arbitrator to have been selected by such party or parties and the third
arbitrator. The arbitration proceedings shall thereafter take place as provided
by the Rules. As provided in the Lease, the unsuccessful party in the
arbitration proceedings shall promptly pay to the successful party all costs and
expenses (including, without limitation, court costs and reasonable attorneys'
fees) incurred therein; provided, however, Landlord and Tenant shall each be
responsible for 50% of (i) all filing fees related to such arbitration
proceedings, and (ii) all fees payable to one or more of the arbitrators.

Notwithstanding anything to the contrary contained in this Exhibit, in no event
shall any dispute regarding the existence of an Event of Default or Landlord's
ability to exercise its rights and remedies in connection therewith (including,
without limitation, the exercise of any of Landlord's remedies set forth in
Section 22.2 of the Lease) constitute, or be deemed to constitute, a "Claim
Subject to Arbitration".

                                      -60-
<PAGE>   64

                                    EXHIBIT G

                                  TENANT'S SIGN

Tenant's Sign shall consist of one (1) identification sign or panel on the pylon
sign for the Project, as shown on Exhibit G-1 attached hereto, one (1) sign on
the Building, as shown on Exhibit G-2 attached hereto, and one (1) monument sign
within the Project, as shown on Exhibit G-3 attached hereto. Tenant shall pay
all costs associated with Tenant's Sign except that Landlord shall pay the costs
of installing the monument sign.

                                      -61-
<PAGE>   65

                                   EXHIBIT G-1

                       TENANT'S SIGN - PANEL ON PYLON SIGN

                                  See attached

       [A drawing showing the existing sign and referencing the location
                  of the tenant's name and logo is attached.]

                                      -62-
<PAGE>   66

                                   EXHIBIT G-2

                        TENANT'S SIGN - SIGN ON BUILDING

                                  See attached

               [A drawing showing where the tenant's sign will be
                      placed on the building is attached.]

                                      -63-
<PAGE>   67

                                   EXHIBIT G-3

                    TENANT'S SIGN - DIRECTIONAL MONUMENT SIGN

                                  See attached

             [A drawing showing a free-standing monument sign to be
                        erected for tenant is attached]

                                      -64-
<PAGE>   68

                                    EXHIBIT H

                   TENANT'S CONTINUING RIGHTS OF FIRST REFUSAL

         1. Provided that no Event of Default has occurred and is continuing and
no event has occurred and is continuing which with the giving of notice or the
passage of time, or both, would constitute an Event of Default, Landlord shall,
during the Term and prior to leasing all or any portion of the Right of First
Refusal Space (as hereinafter defined), provide Tenant with the first refusal
rights set forth below. As used herein, the term "RIGHT OF FIRST REFUSAL SPACE"
shall mean up to but not to exceed 25,000 rentable square feet of the Project,
which is designated as the "Right of First Refusal Space" on Exhibit H-1
attached to the Lease; provided, however, that if, after complying with the
terms hereof, Landlord leases all or a portion of the space described on Exhibit
H-1, then the Right of First Refusal Space shall thereafter be the remainder of
the space described on Exhibit H-1, if any, plus the then unleased space in the
Project, if any, which is adjacent to the Premises or which is adjacent to the
remainder of the space described on Exhibit H-1. Under no circumstances shall
the Right of First Refusal Space exceed 25,000 rentable square feet, and the
parties acknowledge that the Right of First Refusal Space may at any time and
from time to time be 0 square feet.

         2. Landlord shall, at any time during the Term if required by this
Exhibit, prior to leasing all or any portion of the Right of First Refusal
Space, deliver to Tenant a written statement (a "STATEMENT") which shall reflect
Landlord's and the prospective tenant's non-binding agreement with respect to
rent, term, finish allowances and other tenant inducements, and other matters
related to the leasing of a designated portion of the Right of First Refusal
Space (any such designated portion referred to herein as the "Statement Space").
Tenant shall have ten (10) business days after its receipt of a Statement within
which to notify Landlord in writing that it will lease the Statement Space on
the terms set forth in the Statement. Failure by Tenant to notify Landlord
within such ten (10) business day period shall be deemed an election by Tenant
not to lease the Statement Space, and Landlord shall have the right to lease
such space to the prospective tenant or an Affiliate thereof. If Landlord does
not lease the Statement Space to such prospective tenant or an Affiliate
thereof, Tenant's right of first refusal with respect to such space shall be
automatically reinstated and Landlord shall be free to market such space to
other prospective tenants only subject to the rights of Tenant in this Exhibit.
Tenant agrees that if it exercises the right of first refusal described in this
paragraph, it must lease all of the Statement Space described in the applicable
Statement, pursuant to the terms thereof, except as set forth in Paragraph 3 of
this Exhibit.

         3. At the time Tenant leases the Statement Space and such space is
added to the Premises, the term "PREMISES" shall mean the then existing Premises
together with such Statement Space and, except as otherwise set forth in this
Exhibit, Tenant's leasing of such Statement Space shall be subject to the
provisions of the Lease. Such Statement Space shall be leased to Tenant upon all
terms and conditions of the Statement (including, without limitation, any and
all concessions and allowances) with the following exceptions:

         a. if the Statement Space is added to the Premises prior to the
expiration of two (2) years following the Commencement Date, Annual Rent for
such Statement Space will be equal to the Annual Rent then payable pursuant to
the Lease, subject to adjustments and increases as provided therein, the lease
of the Statement Space shall be coterminous with the Term set forth in the
Lease, and any tenant improvement and other allowance shall be as set forth in
the Lease and shall be prorated based on the length of the Initial Term
applicable to the Statement Space in relation to the original Initial Term set
forth in the Lease; and

         b. Annual Rent with respect to such Statement Space shall commence when
Landlord delivers possession of such Statement Space to Tenant.

         4. Within fifteen (15) days after the date of Landlord's receipt of
Tenant's written notice that it will lease the Statement Space described in the
applicable Statement, Landlord and Tenant will enter into an amendment to the
Lease reflecting (i) the addition of such Statement Space to the Premises, (ii)
the increase in Annual Rent payable under the Lease as provided by this Exhibit,
(iii) the increase in Tenant's Share, and (iv) such other amendments to the
Lease as are necessary due to the addition of such Statement Space to the
Premises.

         5. Tenant may not exercise its rights under this Exhibit if an Event of
Default by Tenant under the Lease has occurred and is continuing. Tenant's
rights under this Exhibit shall terminate following the occurrence of any of the
following events: (a) Tenant's right to possess all or any of the Premises is
properly terminated; (b) the failure of Tenant to timely exercise either of the
Extension Options; and/or (c) any proper termination of the Lease or Tenant's
right to possess the Premises.

         6. Notwithstanding anything contained herein to the contrary, if the
Statement Space contains space in excess of the 25,000 rentable square feet
which comprises the Right of First Refusal Space, (i) Tenant must exercise its

                                      -65-
<PAGE>   69

right hereunder, if at all, as to all of the space contained in the Statement,
and (ii) if Tenant declines the Statement Space because such space was in excess
of 25,000 square feet, then Tenant's right of first refusal described herein
shall continue as to the remainder of the Right of First Refusal Space, if any
(as the same may be adjusted in accordance with the definition of Right of First
Refusal Space set forth above).

         7. Notwithstanding anything contained herein to the contrary, Landlord
is currently in negotiations with another tenant for the lease of approximately
100,000 rentable square feet within the Project, which comprises the remainder
of the unoccupied rentable square feet in the Project and includes the Right of
First Refusal Space. Tenant acknowledges and agrees that (a) Landlord shall have
the right to enter into said lease without offering such space to Tenant or
otherwise being bound by the provisions of this exhibit, (b) Tenant shall not
have any rights under this exhibit until such time, if ever, as the Right of
First Refusal Space becomes available for lease, and (c) the entering into of
said lease shall not be a default by Landlord under this exhibit.

                                      -66-
<PAGE>   70
                                   EXHIBIT H-1

                  DEPICTION OF THE RIGHT OF FIRST REFUSAL SPACE

[A drawing of the building is attached, which is shaded to reflect the space
for which tenant has a right of first refusal. The space is marked as
approximately 25,000 RSF.]

                                      -67-
<PAGE>   71

                                    EXHIBIT I

                          TENANT'S RIGHT OF FIRST LEASE

         Subject to the terms and conditions hereof, Tenant shall have a
continuing Right of First Offer (herein so called) with respect to the 25,000
rentable square feet contiguous to the Premises and shown on Exhibit I-1
attached hereto and made a part hereof (the "Offering Space"). The foregoing
Right of First Offer shall be exercised by Tenant as follows:

         1. At any time after Tenant has determined that it desires to exercise
the Right of First Offer, Tenant shall so notify Landlord in writing, specifying
the portion of the Right of First Offer Space (which, if less than all of the
Right of First Offer Space, must be contiguous to the Premises and must be at
least 5,000 rentable square feet in area).

         2. Within ten (10) business days of receipt of such notice, Landlord
shall notify Tenant in writing whether the Right of First Offer Space for which
Tenant has sought to exercise its Right of First Offer (referred to herein as
the "Offer Space") is "available for lease" (as hereinafter defined). If the
Offer Space is not available for lease, then the parties shall not be required
to add the Offer Space to the Premises, but if the Offer Space is available for
lease, the Offer Space shall be added to the Premises as hereinafter set forth.

         3. Space shall be deemed available for lease if none of the following
conditions exist with respect to such space:

         a. It is currently subject to an executed lease agreement;
         b. A letter of intent for the lease of such space has been executed by
Landlord; or
         c. Landlord is currently engaged in negotiations of a lease document
for such space (whether pursuant to a letter of intent or otherwise).

         4. If the Offer Space is available for lease, the Offer Space shall be
added to the Premises and shall be leased by Tenant upon all terms and
conditions of the Lease provided:

         a. if the Offer Space is added to the Premises prior to the expiration
of two (2) years following the Commencement Date, Annual Rent for such Offer
Space will be equal to the Annual Rent then payable pursuant to the Lease, and
any tenant improvement and other allowance shall be as set forth in the Lease,
prorated based on the length of the Initial Term applicable to the Offer Space
in relation to the original Initial Term set forth in the Lease;

         b. if the Offer Space is added to the Premises after the expiration of
two (2) years following the Commencement Date, the rent for the Offer Space and
the tenant improvement and other allowance shall be in accordance with Fair
Market Rental (as defined in the Lease);

         c. the term of such the lease of the Offer Space shall be coterminous
with the Term set forth in the Lease;

         d. Annual Rent with respect to such Offer Space shall commence when
Landlord delivers possession of such Offer Space to Tenant; and

         e. any Offer Space taken by Tenant shall be deemed part of the Premises
as of the commencement of the lease term for such Offer Space taken by Tenant.

         5. Within fifteen (15) days after the date Landlord notifies Tenant
that the Offer Space is available for lease, Landlord and Tenant will enter into
an amendment of the Lease reflecting (i) the addition of such Offer Space to the
Premises, (ii) the increase in Annual Rent payable under the Lease as provided
by this Exhibit, (iii) the increase in Tenant's Share, and (iv) such other
amendments to the Lease as are necessary due to the addition of such Offer Space
to the Premises.

         6. Tenant may not exercise its rights under this Exhibit if any of the
following conditions are in existence:

         a. an Event of Default by Tenant under the Lease has occurred and is
continuing or an event has occurred and is continuing which with the giving of
notice or the passage of time, or both, would constitute an Event of Default by
Tenant under the Lease; or
         b. the Premises, or any portion thereof, is sublet other than pursuant
to a Permitted Transfer; or
         c. the Lease has been assigned other than pursuant to a Permitted
Transfer; or
         d.  Tenant is not occupying the Premises; or
         e.  the Offer Space is not intended for the exclusive use of Tenant.

                                      -68-
<PAGE>   72

Further, Tenant's rights under this exhibit shall terminate following the
occurrence of any of the following events: (a) Tenant's right to possess all or
any of the Premises is properly terminated; and/or (b) any proper termination of
the Lease.

         7. Disputes under this exhibit shall be subject to arbitration under
the applicable provision of the Lease. Any dispute over Landlord's rejection of
Tenant's acceptance for not meeting the requirements of this exhibit must be
submitted for arbitration within ten (10) days of Tenant's receipt of that
written notice of rejection.

         8. Notwithstanding anything contained herein to the contrary, Landlord
is currently in negotiations with another tenant for the lease of approximately
100,000 rentable square feet within the Project, which comprises the remainder
of the unoccupied rentable square feet in the Project and includes the Right of
First Offer Space. Consequently, the Right of First Offer Space is not currently
available for lease. Tenant acknowledges and agrees that (a) Landlord shall have
the right to enter into said lease, (b) if Landlord enters into said lease,
Tenant shall not have any rights under this exhibit until such time, if ever, as
the Right of First Offer Space becomes available for lease, and (c) the entering
into of said lease shall not be a default by Landlord under this exhibit.

                                      -69-
<PAGE>   73

                                   EXHIBIT I-1

                   DEPICTION OF THE RIGHT OF FIRST LEASE SPACE

                                  See attached

[A drawing (which is the same as the drawing attached to Exhibit H-1) is
attached. It is shaded to reflect the space for which tenant has a right of
first refusal. The space is marked as approximately 25,000 RSF.]

                                      -70-
<PAGE>   74

                                    EXHIBIT J

                            TENANT'S POWER GENERATOR

         1. For the Term of the Lease, and as partial consideration for the
monies to be paid hereunder, Tenant shall have the non-exclusive right and
license (the "POWER GENERATOR LICENSE"), subject to the approval of the City of
North Richland Hills and all other governmental authorities having jurisdiction
over the Project and Tenant's operations, to install, maintain, repair and
replace from time to time, at the location outside the Building identified on
the Rider C attached to the Lease (the "GENERATOR PAD"), a power generator,
together with associated equipment and fuel tanks (collectively, "TENANT'S POWER
GENERATOR"), to provide primary or backup power, or both, to Tenant's equipment
at the Premises. Landlord has made no representations or warranties with respect
to (i) Tenant's ability to install the Generator Pad and/or Tenant's Power
Generator at the Project, or (ii) the manner in which Tenant's Power Generator
would be integrated into the existing systems servicing the Building and/or
Premises. The Generator Pad and Tenant's Power Generator shall by secured by a
fence with a locked gate. During the Term, Tenant shall maintain such fencing in
good repair and condition. Landlord shall provide, at no additional charge,
license rights and, if applicable, riser space as necessary to connect Tenant's
Power Generator to Tenant's equipment at or otherwise serving the Premises.
After installing Tenant's Power Generator, Tenant shall maintain all permits
necessary for the maintenance and operation of Tenant's Power Generator while it
is located at the Generator Pad. Landlord agrees to cooperate with Tenant, at no
expense to Landlord, to obtain any land use permits required for the
construction, maintenance and operation of Tenant's Power Generator.

         2. Tenant shall, at its risk and expense, remove the Generator Pad and
Tenant's Power Generator from the Project within thirty (30) days after the
occurrence of any of the following events: (A) a proper termination of the Lease
by Tenant or Landlord (other than a termination of the Lease by Landlord
following the occurrence and during the continuance of an Event of Default); or
(B) Tenant assigns any of its interest in the Lease or sublets any portion of
the Premises (other than to a Permitted Transferee). Tenant shall, at its risk
and expense on or before the date of the expiration of the Term or any proper
termination of the Lease or Tenant's right to possess the Premises following the
occurrence and during the continuance of an Event of Default, remove the
Generator Pad and Tenant's Power Generator from the Project. If Tenant fails to
remove either of the Generator Pad or Tenant's Power Generator as required by
the preceding two sentences, the Generator Pad or Tenant's Power Generator, as
applicable, shall become the property of Landlord and Landlord (and its agents,
employees or contractors) may remove the same and store or dispose of it in any
manner Landlord deems appropriate without liability to Tenant. Tenant shall,
within ten (10) days after Tenant's receipt of Landlord's written request for
the following reimbursement, reimburse Landlord for all costs incurred by
Landlord in connection with any removal of the Generator Pad or Tenant's Power
Generator, as applicable, by Landlord or its agents, employees or contractors
that is permitted by this Exhibit. Prior to any removal of the Generator Pad
and/or Tenant's Power Generator by or on behalf of Tenant (but excluding any
removal of the Generator Pad or Tenant's Power Generator by Landlord or its
agent, employee or contractor), Tenant shall (i) obtain Landlord's written
approval (which approval shall not be unreasonably withheld or delayed) to the
plans related to the same (Landlord's approval of such plans shall create no
responsibility or liability on the part of Landlord for the completeness, design
or sufficiency of such plans), (ii) obtain and maintain all permits and/or
approvals required by applicable Laws with respect to the removal of the
Generator Pad and/or Tenant's Power Generator and provide Landlord with
sufficient evidence of the existence of such permits and/or approvals and that
the removal of the Generator Pad and/or Tenant's Power Generator planned by
Tenant will comply in all respects with all applicable Laws, and (iii) furnish
Landlord with the written evidence of insurance that Tenant is obligated to
furnish to Landlord pursuant to Section 20 of the Lease. Tenant shall repair any
damage to the Generator Pad and/or Project caused by or relating to Tenant's use
of Tenant's Power Generator (including, without limitation, any damage caused by
its installation, maintenance, use, or removal of Tenant's Power Generator).

         3. Except for the installation costs to be paid by Landlord as is
provided in Section 5.1 of the Lease, Tenant shall be solely responsible for all
costs of constructing, installing, maintaining and operating the Generator Pad
and Tenant's Power Generator. Prior to installing Tenant's Power Generator on
the Generator Pad, Tenant must also satisfy the following conditions precedent:
(a) Tenant shall have obtained and be maintaining all permits and/or approvals
required by applicable Laws with respect to the installation, maintenance and
operation of the Generator Pad and Tenant's Power Generator (collectively, the
"POWER GENERATOR LEGAL REQUIREMENTS") and shall have provided Landlord with
sufficient evidence of the existence of such permits and/or approvals and that
the installation of the Generator Pad and/or Tenant's Power Generator planned by
Tenant will comply in all respects with the Power Generator Legal Requirements;
and (b) Tenant shall have furnished Landlord, in the form and content required
by Section 20 of the Lease, with evidence of the insurance that Tenant is
obligated to furnish to Landlord pursuant to Section 20 of the Lease. Landlord's
approval of any plans and specifications related to the installation of the
Generator Pad and/or Tenant's Power Generator shall create no responsibility or
liability on the part of Landlord for the completeness, design or sufficiency of
such plans and specifications, or the compliance of the same with the Power
Generator Legal Requirements. If Tenant satisfies the

                                      -71-
<PAGE>   75

conditions precedent set forth above, Tenant shall install (in a good and
workmanlike manner), maintain and use Tenant's Power Generator in accordance
with all Power Generator Legal Requirements. Tenant shall promptly pay to
Landlord or to Tenant's contractors, as the case may be, when due, the cost of
all work performed in connection with the installation of the Generator Pad and
Tenant's Power Generator, and upon completion, deliver to Landlord evidence of
payment and waivers of all liens for labor, services or materials. Tenant shall
protect, defend, indemnify and hold Landlord and all Landlord Indemnified
Parties harmless from all Claims and/or liens for labor, services or materials
relating to such work that may arise as a result of any failure by Tenant to
satisfy its obligations set forth in this Exhibit. In the event Landlord incurs
any expenses in the removal of trash or due to the cleaning of the public
corridors and loading dock areas or any other areas of the Project as a direct
result of Tenant's or Tenant's contractors' work, then Tenant shall reimburse
Landlord for such expenses within ten (10) days of Tenant's receipt of a bill or
bills from Landlord for the amount of such expenses.

         4. Landlord agrees that Rent or assessments or expenses will not be
charged to Tenant for the Power Generator License. Tenant's Power Generator and
the Generator Pad may only be used by Tenant and any Permitted Transferee.

         5. Tenant shall protect, defend, indemnify and hold harmless Landlord
and all Landlord Indemnified Parties from all Claims resulting from and/or
arising in connection with or related to the installation, maintenance, use, or
removal of the Generator Pad and/or Tenant's Power Generator by Tenant, its
agents or contractors or, if permitted by this Exhibit, the removal of the
Generator Pad or Tenant's Power Generator by Landlord, its agents, employees or
contractors, INCLUDING THOSE ARISING FROM THE NEGLIGENCE OF LANDLORD OR ANY
LANDLORD INDEMNIFIED PARTIES, except to the extent that the Claim in question
was caused by Landlord's or its agents', employees' or contractors' sole or
gross negligence or willful misconduct. All additional equipment and work
related to Tenant's Power Generator shall be located in the Premises or at the
Generator Pad, unless an alternate location within the Project is approved by
Landlord. If Landlord allows such additional equipment to be located outside of
the Premises and the Generator Pad, Tenant and Landlord shall mutually agree
upon a reasonable rental for space occupied by such equipment. Tenant and its
contractors shall have access at all times to the Generator Pad and Tenant's
Power Generator for the purposes of servicing, repairing, or otherwise
maintaining the same.

         6. The indemnification of Landlord and Landlord Indemnified Parties in
the preceding paragraph and the obligations of Tenant with respect to the
removal of the Generator Pad and Tenant's Power Generator from the Project shall
survive the expiration of the Term and any earlier termination of the Lease.

                                      -72-
<PAGE>   76

                                   EXHIBIT K-1

                          SHELL IMPROVEMENTS (INTERIOR)

The following building standard, commercial-grade, improvements shall be
provided to the Premises at Landlord's sole cost and expense.

1.       First Floor-Level concrete slab to an 1/4 inch rise or drop in 10 feet,
         as determined by a 10 foot straightedge placed anywhere on the slab in
         any direction.

2.       Building standard ceiling grid installed throughout and building
         standard ceiling tiles boxed and ready for installation by Tenant's
         contractor.

3.       Semi-recessed sprinkler heads including escutcheons, furnished and
         installed per shell building code.

4.       2 x 4 Lithonia 3" 18 Cell parabolic light fixtures with T-8 lamps and
         electronic ballasts (or equivalent), furnished, boxed and stacked on
         the floor at a ratio of 1 fixture per each 100 Rentable square foot,
         ready for installation by Tenant's contractor.

5.       New, commercial-grade HVAC units, each with a warranty of at least five
         (5) years, with a quality rating of at least EER 8-7 will be installed
         by competent professionals including all horizontal sheet metal supply
         and return ductwork with flex drops and diffusers in a standard grid
         pattern. Modifications per Tenant's plan will be at Tenant's cost. An
         average temperature of 70(degrees)-75(degrees) will be provided on a
         year-round basis, based on a maximum occupancy of one (1) person per
         each 200 Rentable square foot. Tenant shall have the right to install
         additional HVAC equipment to supplement these ratios based on business
         needs upon obtaining Landlord's prior written consent, which shall not
         be unreasonably withheld, delayed or conditioned.

6.       All life safety systems per Code and AFA/TAS including restrooms and
         HVAC.

7.       Furr out 5/8" gypsum wallboard on all columns and exterior walls as
         required - taped and bedded, sanded and ready for finish. Exterior
         walls will be insulated.

8.       Plumbing - Provided sewer gut line below the suite and 2" domestic
         water service overhead and across the suite.

9.       Electrical service in the building shall be provided equal to not less
         than 8 watts/SF of connected load consisting of 2 watts/SF for lighting
         (277 volts) and 6-watts/SF convenience (120 volt) service. (800 amp 480
         volt, 3 phase, 4 wire service) for the sole use of Tenant, taps and
         distribution from the Riser at Tenant's expense.

10.      Weather tight building, shell and exterior, including perimeter window
         frames, seals, mullions, and glazing in good condition, with Building
         Standard window coverings in place and new condition.

11.      A new, commercial grade roof with a warranty of at least twenty (20)
         years will be installed by competent professionals.

Should Landlord and Tenant subsequently agree that any of these improvements
will be completed by the Tenant's contractor as part of the construction of the
Tenant Improvements in the Premises, Tenant shall receive a credit for any such
improvements which Landlord is not required to provide, which credit shall be
used to increase the Allowance, as defined in Exhibit L.

                                      -73-
<PAGE>   77

                                   EXHIBIT K-2

                              EXTERNAL IMPROVEMENTS

The following external improvements shall be provided to the Project at
Landlord's sole cost and expense.

1.       Parking Lot shall be newly sealed and striped. A new asphalt parking
         lot with an average of 2 foot-candle parking lot lighting shall be
         constructed to the west and shall be completed by the second move-in
         date (September 1, 2000). A new curb cut and approach will be
         constructed off Combs Road for frontage access directly in front of
         Tenant's entrance.

2.       Landlord will, at its expense, provide three (3) windows on each side
         of the main entrance. One main entrance is located on the east side of
         the building and one is located on the south side of the building.
         Additionally, windows will be provided in place of existing metal doors
         within the Premises. Locations of existing doors are noted on the
         attached floor plan. A minimum of one window per panel within the
         Premises will be provided. A new entrance and facade shall be
         constructed prior to the completion date set forth in the Lease for the
         improvements described in this Exhibit to match appearance of existing
         entrances and subject to Tenant approval of designs.

3.       Landlord will coordinate with the electric utility provider to provide
         dual electric utility feed from separate substations to the Premises.
         Landlord will pay all costs for the initial site improvement including
         electric duct bank, transformers, automatic transfer switch, conduit
         and conductors to the Premises. Landlord further agrees that Tenant's
         one time charge for the "standby substation reserved capacity" fee (the
         "FEE") if any and if applicable, will be limited to its pro rata share
         of the rentable square foot contained in the office portion of the
         Building as if it were 100% occupied. Representatives of TXU have
         estimated the cost of the Fee to be $18,279.00, of which Tenant shall
         pay its aforementioned pro rata share, which shall be paid be deduction
         from the Allowance; provided, the foregoing estimate shall not limit
         the Fee. The dual feed shall be provided no later than the completion
         date set forth in the Lease for the improvements described in this
         Exhibit, subject to delays beyond the control of Landlord.

4.       Landlord will generally improve the exterior facade of the entire
         building with new EIFS and textured paint consistent with marketed
         plans and specifications for the Project. Also, parking areas will be
         generally improved by the Landlord with new landscape islands, curbs,
         retopping, reseal and restriping.

                                      -74-
<PAGE>   78

                                    EXHIBIT L

                                  WORK LETTER

It is agreed that Tenant will complete construction of the Initial Premises in
accordance with the following terms and provisions;

1. (a) No later than May 15, 2000, Tenant shall submit to Landlord Tenant's
proposed complete, architectural, electrical and mechanical plans and
specifications (the "PLANS") for the construction of the Tenant Improvements in
the Premises. Tenant has selected F. Brown and Associates to prepare the Plans,
and Landlord has no objection to F. Brown and Associates as the "TENANT'S
ARCHITECT." Accurate as-built drawings shall be provided to the Tenant's
Architect. Any costs associated with providing as-built drawings shall not be
charged to the Allowance (as hereinafter defined). The Plans shall be subject to
Landlord's prior written approval; provided, however, that Landlord's approval
rights of the plans, specifications and standards of the interior design shall
be limited to items impacting structural elements, HVAC, electrical, fire
protection, plumbing systems, exterior appearance and only such other items as
might materially and adversely affect the Project. The cost of preparing the
Plans, which shall be borne by the Tenant, may be applied against the Allowance
(as hereinafter defined). As used herein, "WORK" shall mean all alterations and
improvements to be constructed in accordance with and as indicated on the Plans.

         (b) Within five (5) business days following the date of Landlord's
receipt of the Plans, Landlord will advise Tenant of Landlord's approval or
disapproval of the Plans in accordance with item "a" above. If Landlord
disapproves any aspect of the Plans, Landlord shall so notify Tenant and specify
the reasons for such disapproval. Landlord may also specify how any such
disapproved item may be made reasonably acceptable to Landlord, and Tenant
shall, within five (5) business days thereafter, deliver to Landlord revised
Plans incorporating the revisions which may be mutually agreeable between
Landlord and Tenant. Approval by Landlord of the Plans shall not be unreasonably
withheld, conditioned or delayed, and such approval shall not be a
representation or warranty of Landlord that such drawings are adequate for any
use, purpose, or condition, or that such drawings comply with any applicable
Law, but shall merely be the consent of Landlord to the performance of the Work
for purposes of this Exhibit. If written notice of the Plan review, approval or
disapproval is not received within the time periods indicated above, the Plans
will be deemed approved.

2. Following the approval in writing by Landlord and Tenant of the Plans, Tenant
shall complete the Work and shall construct the improvements contemplated by the
Plans (collectively, the "TENANT IMPROVEMENTS"), in accordance with the Plans.
Landlord shall not charge Tenant a construction management fee in connection
with the Tenant Improvements).

3. All costs and expenses incurred in the design and construction of the Tenant
Improvements shall be borne by Tenant (and are hereinafter referred to as
"TENANT'S COSTS"); provided, however, (i) that Tenant shall receive a tenant
improvement allowance (the "ALLOWANCE") of $25.00 per square foot of rentable
square feet contained in the Initial Premises, to be credited against the
Tenant's Costs in the Initial Premises, (ii) any payment or performance bonds
required by Landlord or its lender in connection with the Work shall not be
included in Tenant's Cost; (iii) to the extent Landlord supplies building
stocked materials as a part of the Work, out of building stocked materials
maintained in Landlord's warehouse, which it does not anticipate doing, such
supplies shall be charged as part of Tenant's Costs at the cost paid by Landlord
for such supplies; provided, Tenant shall not be required to use any building
stocked materials of Landlord; and (iv) in addition to the above Allowance,
Landlord shall at its sole cost and expense, provide all of the improvements set
forth in Exhibit L to this Lease (collectively, the "SHELL IMPROVEMENTS") and
temporary utilities, toilets, and contractor parking to the Premises and the
Tenant's Contractor during construction of the Tenant Improvements, and the
costs of same shall not be included in Tenant's Cost, (v) Tenant costs shall
exclude any expense in causing the base building shell, mechanical and
electrical core areas and equipment, common areas or parking areas to comply
with applicable codes, laws, rules or regulations and (vi) Tenant costs shall
exclude demolition and upgrades of exterior or common areas to meet ADA/TAS
codes.

4. Landlord shall provide payment of up to $3.50 per rentable square foot of the
Allowance upon execution of the Lease. The balance of the Allowance shall be
paid as Tenant incurs Tenant Costs upon submission of payment requests from
Tenant and during the course of construction, as payments are required under the
construction contract for the Tenant Improvements, subject to the terms and
conditions hereof. Tenant's right to receive reimbursement of costs incurred by
Tenant from the Allowance shall be subject to submission by Tenant to Landlord
of written evidence of such costs reasonably satisfactory to Landlord and its
lender; provided, however, Tenant must submit all invoices and requests for
payment of the Allowance within one hundred twenty (120) days of the initial
Rent Commencement Date, and Tenant's right to reimbursement for any costs paid
by Tenant for which it has not previously submitted invoices and request for
payment shall expire one hundred twenty (120) days after the initial Rent
Commencement Date.

                                      -75-
<PAGE>   79

5. In the event the Allowance is not completely utilized, Tenant shall receive a
credit against Annual Rent due and accruing in the amount of the unused
Allowance. The Allowance may not be used towards the purchase of any furniture.

6. The Tenant's Costs shall also include the out of pocket, third party costs
incurred by Tenant for the purchase and installation of telecommunication
equipment in the Premises, space planning and design costs, project management
costs, security, data/phone cabling, moving and relocation costs.

7. Tenant may, at its option and by written notice to Landlord, elect to
increase the Allowance to pay additional Tenant's Costs by up to but not in
excess of an additional $5.00 per rentable square foot in the Initial Premises;
provided, however, if Tenant elects to do so, the Annual Rent (and monthly
payments thereof) under Sections 1.7(b) and 1.7(c) shall increase by an amount
sufficient to amortize such increase at an annual interest rate of 13% and for a
period of time equal to the remainder of the Initial Term. Tenant's right to
increase the Allowance shall expire ninety (90) days after the initial Rent
Commencement Date.

8. If Tenant requests any changes in the Plans, Tenant shall present Landlord
with revised drawings and specifications for Landlord's approval, which approval
will not be unreasonably withheld, conditioned or delayed. If Landlord approves
such changes, Tenant shall incorporate such changes in the Tenant Improvements.

9. Tenant will obtain bids for the construction of the Work pursuant to the
Plans from three (3) contractors acceptable to Tenant and Landlord. Within five
(5) business days after bids are received by the Tenant, Tenant shall notify
Landlord in writing which bid Tenant selects, and the Approved Contractor whose
bid is accepted by Tenant shall be the contractor (the "TENANT'S CONTRACTOR")
for the construction of the Work. In order to expedite the completion of the
Work, Tenant may select the Tenant's Contractor, without complying with the
foregoing competitive bid process, subject to the prior written approval of
Landlord, which approval shall not be unreasonably withheld, conditioned or
delayed by Landlord.

10. Following the selection of the Tenant's Contractor, Tenant shall, subject to
the terms and provisions of this Exhibit, enter into a construction contract
with the Tenant's Contractor to commence and complete the Work substantially in
accordance with the Plans at or before the Commencement Date. The construction
contract between Tenant and the Tenant's Contractor shall be subject to
Landlord's reasonable approval. All contractors and subcontractors doing work in
the Project must be approved by Landlord. The Tenant's Contractor and all other
contractors and subcontractors shall be required to procure and maintain
insurance against such risks, in such amounts, and with such companies as
Landlord may reasonably require. Certificates of such insurance and copies of
such certificates of insurance must be received by Landlord before the Work or
any other work other Project is commenced. The Work shall be performed in a good
and workmanlike manner that is free of defects and is in conformance with the
Plans. The Work shall be performed in such a manner and at such times as to
maintain harmonious labor relations and not to interfere with or delay
Landlord's other contractors, the operation of the Building, and the occupancy
thereof by other tenants. All contractors and subcontractors shall contact
Landlord and schedule time periods during which they may use Building facilities
in connection with the Work (e.g., elevators, excess electricity, etc.). All
approvals of Landlord pursuant to this paragraph must be in writing and shall
not be unreasonably withheld, conditioned or delayed by Landlord.

11. For the purposes of this Work Letter, the term "completion" of the Tenant
Improvements or of the Work shall mean substantial completion of such
Improvements in all material respects excepting only minor finish and touch-up
work which does not interfere with the occupancy of the Premises by Tenant, as
mutually determined by Landlord's and Tenant's architect, whose determination
shall be binding upon Landlord and Tenant. To the extent completion is delayed
by any act or omission of Landlord or its employees, agents or contractors, the
date of completion shall be the date when completion would have been achieved in
accordance herewith if such Landlord (or its employee, agent or contractor)
delay had not taken place.

12. Tenant's approval of any matter pursuant to this Exhibit shall not be
unreasonably withheld, conditioned or delayed. If Tenant's approval is requested
and if Tenant has not, within seven (7) business days after Landlord's request
for such approval is submitted to Tenant, notified Landlord in writing whether
Tenant approves or does not approve the matter, Tenant would be deemed to have
approved the matter. If Tenant withholds its approval of any matter on grounds
considered by Tenant to be reasonable and Landlord disputes that such
withholding of Tenant's approval is based on reasonable grounds, such dispute
shall be submitted for resolution by binding arbitration in accordance with the
terms, conditions and provisions of the Exhibit F attached to the Lease. In the
same manner, the foregoing requirements and consequences shall also apply to the
performance of the Landlord.

13. Landlord acknowledges that Tenant has selected The Staubach Company as its
representative (the "TENANT'S CONSTRUCTION REPRESENTATIVE") in the design and
construction process. Landlord will afford Tenant's Construction Representative
access to the site and copy the Tenant's Construction Representative on all
correspondence to the Tenant related to the completion of the Work.

                                      -76-
<PAGE>   80

14. Tenant agrees to obtain and to furnish to Landlord a Certificate of
Occupancy for the Initial Premises from applicable local authorities on or
before the Rental Commencement Date.

                                      -77-
<PAGE>   81

                                     RIDER A

          LIST OF PROHIBITED COMPANIES (FOR PURPOSES OF SECTION 6.4(c))

                                 See attached.

                                      -78-
<PAGE>   82
                                    RIDER A

ASAP
Cambridge Technology Partners, Inc.
Centos
Corporate Software & Technology
Compucom Systems, Inc.
CompUSA
Compaq
Convergys
Cytel
Data Return
DecisionOne Corporation
Dell
Entex
General Electric
Hewlett Packard
Inacom
Keane, Inc.
Lucent Technologies
March First
MCI Worldcom
Microsoft Consulting
National Tech Team
Softmart
Softchoice
Softwarehouse International
Startek
Stream International, Inc.
Sykes Enterprises Incorporated
Vanstar
Wareforce

                                      -79-
<PAGE>   83

                                     RIDER B

                               SATELLITE DISH AREA

         The location of Satellite Dish Area shall be selected by Landlord and
such location shall subject to the prior written approval of Tenant, such
approval not to be unreasonably withheld, conditioned or delayed.

                                      -80-
<PAGE>   84

                                     RIDER C

                          LOCATION OF THE GENERATOR PAD

         The location of the Generator Pad shall be selected by Landlord and
such location shall subject to the prior written approval of Tenant, such
approval not to be unreasonably withheld, conditioned or delayed.

                                      -81-
<PAGE>   85
                                     RIDER D

                 PERSONNEL WHICH LANDLORD CURRENTLY ANTICIPATES
        WILL BE EMPLOYED AT LEAST IN PART FOR OR ON BEHALF OF THE PROJECT

5201 RUFE SNOW DRIVE
North Richland Hills, Texas
Pass-through Operating Expenses - 2000 Estimate

200,603 Sq. Ft.

<TABLE>
<CAPTION>
                                            COST/RSF
                                            --------
<S>                                         <C>
Administrative                              $   0.24

Management Fees                             $   0.36

Repairs & Maintenance
    Lighting                                $   0.06
    Exterior Landscape                      $   0.14
    Life Safety                             $   0.01
    Exterminating                           $   0.01
    Parking Maintenance                     $   0.02
    Common Area HVAC                        $   0.05
    Misc. Maintenance & Repairs             $   0.06
                                            --------
    Sub-total                               $   0.35

Cleaning
    Common Area Cleaning                    $   0.06
    Trash Removal                           $   0.06
    Window Washing                          $   0.01
                                            --------
    Sub-total                               $   0.13

Security
    Security Patrol Svc                     $   0.03
                                            --------
    Sub-total                               $   0.03

Utilities
    Electricity - Common Use                $   0.15
    Water                                   $   0.12
                                            --------
    Sub-total                               $   0.27

Property Taxes                              $   0.31

Insurance                                   $   0.12

TOTAL ESTIMATED P/T OPERATING EXPENSES      $   1.81
                                            ========

Janitorial Services - Tenant Spaces         $   0.65

HVAC Service - Tenant Spaces                $   0.21

Electrical Costs - Tenant Spaces            $   1.50

FULL SERVICE COSTS                          $   4.27
                                            ========
</TABLE>

                                      -82-
<PAGE>   86

                                     RIDER E

                        INITIAL NON-DISTURBANCE AGREEMENT

                         SUBORDINATION, NON-DISTURBANCE
                            AND ATTORNMENT AGREEMENT

         THIS AGREEMENT, made by and between The First National Bank of Athens
("Lender") and ______________________________________________ ("Tenant").

         WHEREAS, Lender is the holder of that certain Promissory Note dated
_____________, executed by _____________________________ payable to the order of
Lender in the original principal sum of $_________________ (the "Note") which is
secured by that certain Deed of Trust dated of even date therewith to Larry D.
Abernathy, as Trustee for Lender duly recorded in the Deed of Trust/Land Records
of _______________ County, Texas (the "Deed of Trust"), which encumbers the
property described therein (the "Property"); and

         WHEREAS, Tenant is lessee under that certain Lease Agreement dated
______________ (the "Lease"), by and between Tenant and _____________________
(the "Landlord"), relating to the premises (or a portion thereof) which is more
particularly described in Exhibit "A" attached hereto (the "Premises"); and

         WHEREAS, Lender is requiring, under its Loan Agreement with Landlord,
that Tenant enter into this Agreement, pursuant to the terms set forth herein.

         NOW, THEREFORE, in consideration of the premises and the promises
herein stated, for Ten Dollars ($10.00) in hand paid and for other good and
valuable consideration, the receipt and sufficiency of which is hereby
acknowledged, the parties do hereby agree as follows:

         1. Subordination. Tenant has subordinated and does hereby subordinate
the Lease, together with any and all rights, title, interests, estates, options,
liens and charges created thereby, to (i) the Deed of Trust, (ii) the Loan
Documents (as defined in the Note), (iii) any and all advances made thereunder
and (iv) any and all renewals, modifications, consolidations, replacements,
extensions, transfers and assignments thereof. The Loan Documents shall be
superior to the right, title, interest and estate of Tenant in and to the
Premises by virtue of the Lease. The Loan Documents may be amended from time to
time without the consent of Tenant.

         2. Nondisturbance. The Lender, for itself, its successors and assigns,
and any foreclosure purchaser, hereby stipulates and agrees that Tenant shall
not be denied the possession and enjoyment of the Premises leased to it by
Landlord under the Lease in the event of any foreclosure or other takeover of
such Premises by Lender, its successors or assigns, or foreclosure purchaser; so
long as Tenant shall be and remain in compliance with all of the terms and
conditions of the Lease.

         3. Attornment. In the event Lender or a transferee, assignee or
purchaser from Lender becomes the owner of the Premises, by foreclosure,
conveyance in lieu of foreclosure, deed under power of sale or otherwise, then
Tenant shall attorn to and recognize Lender or the transferee, assignee or
purchaser from Lender as the landlord under the Lease for the remainder of the
term thereof, and Tenant shall perform and observe its obligations thereunder,
subject only to the terms and conditions of the Lease. Lender or a transferee,
assignee or purchaser from Lender shall assume or become liable (subject to the
limitations in this Paragraph 3) for Landlord's obligations under the Lease
which liabilities and obligations arise or accrue from and after the date Lender
or such transferee, assignee or purchaser from Lender becomes the owner of the
Premises; provided, further, that if thereafter Lender or a transferee, assignee
or purchaser from Lender shall sell the Premises and transfer the Lease to a
third party who pursuant to a written agreement agrees to assume and perform all
of the duties and obligations of the landlord under the Lease, Lender or such
transferee, assignee or purchaser from Lender (or its assignee, as applicable)
shall be released from all further liability under the Lease arising after such
transfer to and assumption by the third party. In no event shall Lender or any
transferee, assignee or

                                      -83-
<PAGE>   87

purchaser from Lender be liable for any act, omission or default of any prior
Landlord; liable for the return of any security deposit; subject to any offsets
or defenses that Tenant might have against any prior Landlord; or bound by any
rent or additional rent that Tenant may have paid more than one month in advance
to any prior Landlord.

         4. Notices. So long as the Loan Documents remain outstanding and
unsatisfied, Tenant will mail or deliver to Lender, at the address and in the
manner hereinbelow provided and contemporaneously with mailing or delivering
such notice to Landlord, a copy of each written notice of any default or claimed
default by Landlord under the Lease (whether or not Tenant is obligated under
the Lease to give written notice thereof to the Landlord). Within thirty (30)
days (or longer, as hereinafter provided), after Lender's receipt of notice from
Tenant of a default or claimed default on the part of Landlord under the Lease,
Lender may, but shall have no obligation to, cure such default or claimed
default, pay any taxes and assessments, make any repairs and improvements, make
any deposits or do any other act or thing required of Landlord by the terms of
the Lease; and all payments so made and all things so done and performed by
Lender shall be as effective to prevent the rights of Landlord from being
forfeited or adversely affected because of any default under the Lease as the
same would have been if done and performed by Landlord. In the event it becomes
necessary for Lender to exercise its rights under the Loan Documents, whether as
a result of Landlord's default under the Lease or otherwise, and thereby seek to
obtain title to the Premises in Lender's name or the name of its nominee by
foreclosure, conveyance in lieu of foreclosure, deed under power of sale or
otherwise, Tenant agrees that Lender or its nominee shall have a reasonable
period of time to obtain title and assume (subject to the limitations in
Paragraph 3 hereof) Landlord's obligations under the Lease, which obligations
shall arise or accrue after the date Lender or nominee obtains title.

         5. No Amendments. So long as the Loan Documents remain outstanding and
unsatisfied, Landlord and Tenant will not alter or amend any of the terms,
provisions or requirements of the Lease without the prior written consent of
Lender. In the event that Landlord and Tenant make such an alteration or
amendment without the prior written consent of Lender, Lender shall not be bound
by such alteration or amendment.

         6. Assignment of Lease. Tenant acknowledges that Landlord will execute
and deliver or has executed and delivered to Lender an assignment of the Lease
as security for the Loan, and Tenant hereby expressly consents to such
assignment.

         7. Addresses. Any and all notices, elections, or demands permitted or
required to be made under this Agreement shall be in writing, signed by the
party (or its counsel) giving such notice, election or demand, and shall be
delivered personally, or sent by registered or certified United States Mail,
postage prepaid, return receipt requested, to the other party at the address set
forth below, or at such other address within the Continental United States of
America as may have therefor been designated in writing at least ten (10) days
in advance. All notices, election or demands shall be effective upon being
delivered personally or being deposited in the United States Mail as aforesaid.

For the purposes of this Agreement, the address of Landlord is:

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

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

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

For the purposes of this Agreement, the address of Tenant is:

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

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

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

For the purposes of this Agreement, the address of Lender is:
         125 North Prairieville
         P. O. Box 751
         Athens TX  75751

                                      -84-
<PAGE>   88

         IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of this ___ day of _________________, 2000.

LENDER:

The First National Bank of Athens

By:
   ----------------------------
      Its
         ----------------------

TENANT:

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

                               CONSENT BY LANDLORD

         ____________________________ hereby consents and stipulates to the
provisions of the foregoing Subordination, Non-Disturbance and Attornment
Agreement.

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

(ADD ACKNOWLEDGMENTS)

                                      -85-

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