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                               1700 PACIFIC AVENUE

                                  OFFICE LEASE

                                 BY AND BETWEEN

                            F/P/D MASTER LEASE, INC.

                                  AS LANDLORD,

                                       AND

                        SERVICE ASSET MANAGEMENT COMPANY

                                    AS TENANT

<PAGE>

                                TABLE OF CONTENTS


                                                                                
1.    Definitions and Basic Lease Provisions ...................................    1
2.    Leased Premises ..........................................................    4
3.    Lease Term ...............................................................    4
4.    Acceptance of Leased Premises ............................................    5
5.    Rent Payments ............................................................    5
6.    Electricity ..............................................................    6
7.    Services by Landlord .....................................................    8
8.    Service Interruptions ....................................................    9
9.    Operating Costs ..........................................................   10
10.   Security Deposit .........................................................   12
11.   Assignment and Subletting ................................................   12
12.   Repair and Maintenance by Tenant .........................................   15
13.   Alterations and Additions by Tenant ......................................   16
14.   Use and Occupancy ........................................................   18
15.   Mechanics' Liens - Tenant's Obligations ..................................   20
16.   Limitations on Liability of Landlord; Waiver .............................   21
17.   Tenant's Indemnification of Landlord: Assumption: Employees' Claims ......   22
18.   Tenant's Insurance .......................................................   23
19.   Landlord's Insurance .....................................................   24
20.   Rights Reserved by Landlord ..............................................   24


                                                                          PAGE i
<PAGE>


                                                                                
21.   Fire or Other Casualty ...................................................   27
22.   Condemnation .............................................................   27
23.   Taxes on Tenant's Property ...............................................   28
24.   Waiver of Subrogation ....................................................   29
25.   Surrender Upon Termination or Expiration; Holdover .......................   29
26.   Removal of Tenant's Property .............................................   30
27.   Events of Default ........................................................   31
28.   Landlord's Remedies ......................................................   32
29.   No Implied Waiver ........................................................   34
30.   Waiver by Tenant .........................................................   35
31.   Attorneys' Fees and Legal Expenses .......................................   35
32.   Subordination ............................................................   35
33.   Quiet Enjoyment ..........................................................   36
34.   Notice of Landlord's Default .............................................   37
35.   Rules and Regulations ....................................................   37
36.   Estoppel Certificate .....................................................   37
37.   Notices ..................................................................   37
38.   Hazardous Materials ......................................................   38
39.   Business Purpose .........................................................   39
40.   Severability .............................................................   39
41.   No Merger ................................................................   39
42.   Force Majeure ............................................................   40


                                                                         PAGE ii

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43.   Brokerage; Mutual Indemnities ............................................   40
44.   Gender ...................................................................   40
45.   Joint and Several Liability ..............................................   41
46.   No Representations .......................................................   41
47.   Entire Agreement; Amendments .............................................   41
48.   Paragraph Headings .......................................................   41
49.   Binding Effect ...........................................................   41
50.   Exhibits .................................................................   41
51.   Counterparts .............................................................   42
52.   Rental Tax ...............................................................   42
53.   Parking ..................................................................   42
54.   Tenant's Service Providers ...............................................   43
55.   Security Disclaimer ......................................................   43
56.   Intentionally Deleted ....................................................   44
57.   Relocation of the Leased Premises ........................................   44
58.   Limitation of Actions ....................................................   46
59.   Execution and Approval of Lease ..........................................   46
60.   Right of First Notice ....................................................   46
61.   Option to Extend Lease Term ..............................................   47


                                                                        PAGE iii

<PAGE>

                                  OFFICE LEASE

      This Office Lease (this LEASE) is entered into as of May 20, 1998 (the
DATE OF THIS LEASE), by F/P/D Master Lease, Inc., a Texas corporation
(LANDLORD), and Service Asset Management Company, a North Carolina corporation
(TENANT).

1. DEFINITIONS AND BASIC LEASE PROVISIONS.

      Some of the basic provisions and defined terms of this Lease are as
follows:

PROJECT:                   1700 Pacific Avenue, Dallas, Texas, including the
                           LAND described on EXHIBIT B, the Building, the
                           On-Site Garage, the concourse, lobbies, plazas,
                           walkways, open spaces, landscaped areas, and similar
                           public areas located on, above, beneath or
                           immediately adjacent to the Land, and any truck
                           accessways, loading docks, or similar facilities
                           which serve the Building, the Off-Site Garage, and
                           the Building's interest in pedestrian tunnels,
                           skybridges or parking garages now or hereafter
                           connecting the Building to any building or garage
                           that may be located on any other block adjacent to or
                           nearby the block in which the Building is located.

BUILDING:                  The building located on the Land, known as 1700
                           Pacific Avenue, located at 1700 Pacific Avenue,
                           Dallas, Texas 75201.

LEASED PREMISES:           31,478 Rentable Square Feet as shown on EXHIBIT A.
                           Suite 1400 on Floor 14 of the Building and Suite 1500
                           on Floor 15 of the Building.

TENANT'S PROPORTIONATE     2.348%, determined by dividing the number of Rentable
SHARE:                     Square Feet contained in the Leased Premises by the
                           Total Building Area. The Tenant's Proportionate Share
                           shall change if the size of the Leased Premises
                           changes as a result of expansions, reductions, or
                           otherwise.

<PAGE>

TOTAL BUILDING AREA:       1,340,481 Rentable Square Feet.

MINIMUM RENT:              $      0.00 per month for months 1 through 6
                           $ 39,347.50 per month for months 7 through 42
                           $ 44,593.83 per month for months 43 through 66
                           $ 47,217.00 per month for months 67 through 90
                           $ 52,463.33 per month for months 91 through 126

RENT:                      The Minimum Rent and all other amounts payable by
                           Tenant to Landlord under this Lease, including
                           Tenant's Proportionate Share of Total Electricity
                           Costs for the Project and Excess Operating Costs.

COMMENCEMENT DATE:         June 1, 1998. (See Paragraph 3)

EXPIRATION DATE:           November 30, 2008. (See Paragraph 3)

LEASE TERM:                126 Months, ending on the Expiration Date.

BASE YEAR FOR OPERATING    Calendar year 1998.
COSTS:

TENANT'S BROKER:           Trinity Advisory Group, Inc.

LANDLORD'S BROKER:         Faison-Stone, Inc., a Texas corporation.

SECURITY DEPOSIT:          $ N/A

OFF-SITE GARAGE:           The approximately 1400 space parking garage on the
                           western end of the block bounded by Harwood, Pearl,
                           Main, and Elm Streets in Dallas, Texas.

ON-SITE GARAGE:            The approximately 300 space parking garage that is
                           part of the Building.

                                                                          PAGE 2
<PAGE>

PARKING:                   4 spaces (Reserved or Unreserved) in the On-Site
                           Garage, 27 Unreserved spaces in the Off-Site Garage,
                           and, subject to availability up to 60 additional
                           unreserved spaces in the Off-Site Garage on a
                           month-to-month basis. (See Paragraph 53)

PERMITTED USE:             General business offices.

TENANT PARTY(IES):         Tenant and its directors, shareholders, partners,
                           trustees, members, agents, contractors,
                           subcontractors, employees, licensees, servants, and
                           invitees and all persons and entities claiming
                           through any of these persons or entities.

Addresses for notices under this Lease:

      LANDLORD:            F/P/D Master Lease, Inc.
                           c/o Faison-Stone, Inc.
                           1700 Pacific Avenue, Suite 4500
                           Dallas, Texas 75201
                           Attention: M. Scott Ozymy
                           Fax: (214) 969-0384

      TENANT:              Service Asset Management Company
                           1700 Pacific Avenue, Suite 1400
                           Dallas, Texas 75201
                           Attention: William D. Gross
                           Fax: (214)________-______________

                           with a copy to:

                           Service Asset Management Company
                           6907 Capital of Texas Highway #230
                           Austin, Texas 78755-0800
                           Attention: Roger J. Engemoen, Jr.
                           Fax: (512) 231-8526

                                                                          PAGE 3
<PAGE>

2.    LEASED PREMISES.

      Landlord, in consideration of the Rent and the obligations of Tenant under
      this Lease, leases the Leased Premises to Tenant and Tenant leases the
      Leased Premises from Landlord, subject to the terms of this Lease. The
      number of RENTABLE SQUARE FEET in the Leased Premises and the Project is
      the square footage of the applicable portion of the Project, is stipulated
      for all purposes to be the number of Rentable Square Feet set forth in
      Section 1 and is binding on Landlord and Tenant subject to changes in the
      size of the Leased Premises.

3.    LEASE TERM.

      (a)   The Lease Term begins on the earliest to occur of: (1) the date
            Tenant occupies any part of the Leased Premises; (2) the
            Commencement Date; or (3) the Ready for Occupancy Date (defined
            below); and ends on the Expiration Date. Notwithstanding the
            foregoing, if the Ready for Occupancy Date occurs before May 22,
            1998, then the Lease Term shall begin on the earlier of (i) the date
            Tenant occupies any part of the Lease Premises or May 25, 1998, and
            if the Ready for Occupancy Date occurs on or after May 25, 1998 and
            before July 3, 1998, then the Lease Term shall begin on the earlier
            of (i) the date Tenant occupies any part of the Lease Premises, or
            (ii) July 3, 1998.

      (b)   Subject to Paragraph 3(c) below, if the Ready for Occupancy Date
            does not occur by the Commencement Date for any reason other than
            omission, delay, or default by any Tenant Party, Tenant's obligation
            to pay Rent does not commence until the Ready For Occupancy Date
            occurs and the Expiration Date is extended for a period of time
            equal to the time period beginning on the Commencement Date and
            ending on the day before the Ready for Occupancy Date. This
            abatement of Rent is Tenant's sole and exclusive remedy and is full
            settlement of all claims that Tenant has against Landlord by reason
            of the Leased Premises not being ready for occupancy by Tenant on
            the Commencement Date.

      (c)   If Tenant occupies any part of the Leased Premises before the
            Commencement Date or the Ready for Occupancy Date, as applicable,
            the Lease Term and Tenant's obligation to pay Rent commence on the
            date Tenant occupies the Leased Premises and the Expiration Date is
            126 months after the date on which Tenant's occupancy commences.
            Tenant is deemed to occupy the Leased Premises when Tenant takes
            possession of any part of the Leased Premises for any purpose,
            including placing furniture and installing Tenant's equipment in the
            Leased Premises.

      (d)   When the first day of the Lease Term is established pursuant to this
            Paragraph 3, Landlord shall prepare and Landlord and Tenant shall
            exchange a letter acknowledging that date and, if the Expiration
            Date changes under this Paragraph, the Expiration Date.

                                                                          PAGE 4
<PAGE>

      (e)   The READY FOR OCCUPANCY DATE is the earlier to occur of:

            (1)   the date that Landlord notifies Tenant that the City of Dallas
                  has approved the Leased Premises for occupancy; or

            (2)   the date the City of Dallas would have approved the Leased
                  Premises for occupancy but for delays caused by any Tenant
                  Party;

            provided, if Landlord performs any Additional Work (defined in
            EXHIBIT F), the Ready for Occupancy Date is deemed accelerated by
            the number of days in the Additional Work Period (defined in EXHIBIT
            F).

4.    ACCEPTANCE OF LEASED PREMISES.

      Tenant's occupancy of the Leased Premises is conclusive evidence that
      Tenant: (A) accepts the Leased Premises as suitable for the purposes for
      which they are leased; (B) accepts the Leased Premises and the Project as
      being in a good and satisfactory condition; and (C) waives any defects in
      the Leased Premises and the Project; provided, however, that by occupying
      the Lease Premises, Tenant shall not be deemed to have accepted or waived
      any defect therein about Tenant, in the exercise of reasonable care, could
      not have learned prior to occupying the Leased Premises.

5.    RENT PAYMENTS.

      (a)   The installment of Minimum Rent due for the seventh (7th) month of
            the Lease Term is payable by Tenant when this Lease is executed.
            Subsequent installments of Minimum Rent are payable by Tenant in
            advance on the first day of each calendar month during the Lease
            Term beginning on the first day of the eighth full calendar month
            after the Commencement Date (or the Ready for Occupancy Date, if
            applicable). Minimum Rent for any partial calendar month is prorated
            on a per diem basis.

      (b)   All Rent is payable by Tenant at the times and in the amounts
            specified in this Lease in legal tender of the United States of
            America to Landlord at the following address or to any other person
            or at any other address as Landlord may from time to time designate
            by notice to Tenant:

                            F/P/D Master Lease, Inc.
                            P.O. Box 844792
                            Dallas, Texas 75284-4792

      (c)   Rent is payable by Tenant without notice, demand, abatement,
            deduction, or set off. Tenant's obligation to pay Rent is
            independent of any obligation of Landlord under

                                                                          PAGE 5
<PAGE>

            this Lease. If any installment of Rent is not paid within 5 days
            after it is due, Tenant shall pay a late charge in an amount equal
            to 10% of the delinquent installment of Rent when it pays the
            delinquent installment. In addition, any Rent not paid when due (and
            which represents amounts not already specified as bearing interest
            under other provisions of this Lease) bears interest from the due
            date until the date paid at a rate (the INTEREST RATE) equal to the
            lesser of the highest rate allowable under applicable law or 18% per
            annum.

6.    ELECTRICITY.

      (a)   Landlord, subject to payment by Tenant as specified below, shall
            furnish electricity as follows:

            -     up to 2 watts per Rentable Square Foot in the Leased Premises
                  at 277 volts for lighting; and

            -     up to 1.25 watts per Rentable Square Foot in the Leased
                  Premises at 120 volts for office machines.

            If Tenant wants to use any office equipment or lighting that will
            cause Tenant's electricity requirements to exceed the specified
            levels or that will generate, excess heat, Tenant must give Landlord
            prior notice specifying Tenant's excess electricity requirements and
            the specific equipment that generates excess heat. If the excess
            electricity requirements can be supplied without, in Landlord's sole
            opinion, overloading the existing Building systems, or if the
            additional equipment necessary to supply Tenant's excess electricity
            requirements can be installed without, in Landlord's sole opinion,
            creating a dangerous condition in the Building, Landlord shall
            supply Tenant's excess electricity requirements and Tenant shall pay
            Landlord the cost of supplying the excess electricity requirements,
            including all installation costs, on demand as additional Rent.

      (b)   If Tenant's electricity use exceeds the specified limits, Landlord
            may, at its sole option, either:

            -     install separate submeter(s) for all or any part of the Leased
                  Premises and Tenant shall pay Landlord the installation cost
                  and the cost of the excess electricity as metered on demand as
                  additional Rent; or

            -     if Landlord does not elect to install separate submeter(s),
                  cause Landlord's engineer to determine the amount of excess
                  electricity to be allocated to Tenant based on the power
                  requirements of the equipment or lighting and Tenant shall pay
                  Landlord the cost of the excess electricity as reasonably
                  determined by Landlord's engineer on demand as additional
                  Rent.

                                                                          PAGE 6
<PAGE>

      (c)   If Tenant's electricity use exceeds the specified limits or any of
            Tenant's equipment generates excess heat, Landlord may also, at its
            sole option and without any obligation to do so, install
            supplemental air conditioning units in the Leased Premises to offset
            the heat-generating effect of Tenant's excess electricity usage and
            Tenant's equipment and Tenant shall pay Landlord the installation
            cost and the cost of operation, use, repair, and replacement of the
            supplemental air conditioning units on demand as additional Rent.

      (d)   The obligation of Landlord to furnish electricity is subject to the
            rules and regulations of the supplier of electricity and of any
            municipal or other governmental authority regulating the business of
            providing electricity. Landlord is not liable to any Tenant Party
            for any failure or defect in the supply or character of electricity
            furnished to the Leased Premises due to any requirement, act, or
            omission of the entity supplying electricity to the Project.

      (e)   Tenant shall pay to Landlord, without any set off or deduction,
            beginning on the Commencement Date, Tenant's Proportionate Share of
            Total Electricity Costs for the Project (defined below) incurred in
            the use, occupancy, and operation of the Project and all related
            improvements and appurtenances, including electricity used for
            heating and air-conditioning and perimeter lighting for the Project,
            net of Submetered Power (defined below).

      (f)   The term TOTAL ELECTRICITY COSTS FOR THE PROJECT means the total
            electricity cost charged to Landlord by the entity supplying
            electricity to the Building, and the Building's share of electricity
            costs charged for other portions of the Project, including taxes,
            but may not include any administrative fee or charge by Landlord.
            The term SUBMETERED POWER means all supplemental electricity that is
            separately submetered by Landlord and paid by tenants in the
            Building or that is separately tracked and calculated by Landlord's
            engineer and paid by tenants in the Building.

      (g)   If Landlord at any time elects to install submeters measuring
            electricity used in the Building or the Leased Premises, which may
            include submeters measuring electricity used for heating and cooling
            the Building or Leased Premises, then Tenant's Proportionate Share
            of those actual costs will be based on actual use as measured by the
            submeters, but, with any areas sharing a submeter being prorated on
            the basis that the area of the Leased Premises bears to the total
            area covered by the submeters.

      (h)   Landlord shall bill Tenant for Tenant's electricity charges under
            this Paragraph monthly and Tenant shall pay its electricity charges
            within 10 business days after receipt of each bill. Landlord shall
            bill Tenant for Tenant's electricity charge for the last full or
            partial month of the Lease Term as soon as practicable after the
            termination or expiration of this Lease and Tenant shall pay the
            bill within 10

                                                                          PAGE 7
<PAGE>

            business days after receipt. Tenant's obligation to pay the bill
            survives the termination or expiration of the Lease.

7.    SERVICES BY LANDLORD.

      Landlord shall maintain the Building, the On-Site Garage, the Off-Site
      Garage and all common areas (exclusive of those portions of the Lease
      Premises Tenant is obligated to maintain hereunder) in accordance with
      standards customarily followed in the maintenance of first-class buildings
      comparable to the Building in the downtown Dallas central business
      district. Landlord, subject to payment by Tenant as specified below, shall
      furnish the following services for the Leased Premises:

      -     air conditioning, both heating and cooling (as required by the
            seasons), from 8:00 a.m. to 6:00 p.m. on weekdays and on Saturdays
            from 8:00 a.m. to 1:00 p.m., except on Holidays (as defined below)
            (the HVAC Standard Hours) amounts as are in the sole judgment of
            Landlord reasonably required for comfortable use and occupancy under
            normal business operations. Circulating air is not available other
            than through the Building's HVAC system. If Tenant requires HVAC
            services at any time other than HVAC Standard Hours, Landlord shall
            furnish after-hours HVAC service for the times specified in a
            request by Tenant received by the Project manager before 2:00 p.m.
            on the business day the extra usage is required. Requests received
            after that deadline will be handled in accordance with Landlord's
            Building Policies in effect at the time. Tenant acknowledges receipt
            of a copy of the current Building Policies. Landlord may make
            changes in the Building Policies and the changes become effective
            when a copy of the revised Building Policies is delivered to Tenant.
            Tenant shall pay Landlord as additional Rent for extra service
            within 5 days after receipt of a bill therefor the greater of (A)
            the actual cost of the extra service [if more than one tenant has
            requested and is furnished after-hours HVAC service for the same
            hour(s) the charge will be prorated if reasonably possible], or (B)
            $50 per hour per floor (whole or partial) of after-hours HVAC
            service. HOLIDAYS are New Year's Day, Memorial Day, Independence
            Day, Labor Day, Thanksgiving, and Christmas. BUSINESS DAYS are
            weekdays other than Holidays.

      -     cold water (at the normal temperature of the water supply to the
            Building) for lavatory and toilet purposes, water for drinking
            purposes, and hot water (from the regular Building supply at
            prevailing temperatures) for lavatory purposes to restrooms located
            in the core area of the Building only, all water service to be at
            supply points provided for general use of tenants of the Building
            through fixtures installed by Landlord, or by Tenant with Landlord's
            prior consent;

      -     janitor and maid service to the Leased Premises in accordance with
            Exhibit G on days other than Fridays, Saturdays, and Holidays;

                                                                          PAGE 8
<PAGE>

      -     window washing and wall cleaning as determined by Landlord in its
            reasonable discretion;

      -     operator-less passenger elevators for ingress and egress to and from
            the floor(s) on which the Leased Premises are located (provided,
            Landlord may reasonably limit the number of elevators to be in
            operation on Saturdays, Sundays, and Holidays) and freight elevator
            service in common with other tenants but only when scheduled through
            the Project manager;

      -     common area rest room facilities; and

      -     electric lighting for all common areas and special service areas of
            the Building in the manner and to the extent deemed by Landlord to
            be reasonable and standard, including replacement of florescent
            light tubes in Building standard light fixtures.

      BUILDING STANDARD HOURS are weekdays, excluding Holidays, from 8:00 a.m.
      to 6:00 p.m. Landlord may lock the Buildings at all times other than
      during Building Standard Hours; provided, however, that Tenant shall at
      all times have access to the Leased Premises by keys, magnetic cards, or
      other access device provided by Landlord in accordance with this Lease,
      subject to reasonable access control measures instituted by Landlord after
      Building Standard Hours.

8.    SERVICE INTERRUPTIONS.

      (a)   Landlord does not warrant that the services provided by Landlord
            will be free from any slow-down, interruption, or stoppage by
            governmental bodies, regulatory agencies, utility companies, and
            others supplying services or caused by the maintenance, repair,
            replacement, or improvement of any equipment involved in the
            furnishing of the services or caused by changes of services,
            alterations, strikes, lock-outs, labor controversies, fuel
            shortages, accidents, acts of God, the elements, or other causes
            beyond the reasonable control of Landlord. Landlord shall use due
            diligence to resume the service upon any slowdown, interruption, or
            stoppage.

      (b)   No slow-down, interruption, or stoppage of the services may be
            construed as an eviction, actual or constructive, of Tenant or cause
            an abatement of Rent or in any manner or for any purpose relieve
            Tenant from its obligations under this Lease. Landlord is not liable
            for damage to persons or property, or in default under this Lease,
            as a result of any slow-down, interruption, or stoppage.

      (c)   Notwithstanding the foregoing, if there occurs an interruption in
            HVAC, electricity, water or elevator services ("ESSENTIAL
            SERVICES"), such interruption is not caused by Tenant or a Tenant
            Party, such interruption renders at least 50% of the Leased Premises
            untenantable, and such interruption continues to render at least 50%
            of the

                                                                          PAGE 9
<PAGE>

            Lease Premises untenantable for (i) 5 consecutive business days if
            caused by Landlord's negligence or willful misconduct, or (ii) 30
            consecutive days if not caused by Landlord's negligence or willful
            misconduct, then Rent shall abate as to that portion of the Leased
            Premises rendered untenantable from the 6th consecutive business day
            or the 31st day, as the case may be, of such interruption and for as
            long as such interruption continues thereafter. The foregoing
            remedies shall be Tenant's sole and exclusive remedies with respect
            to interruption of services.

9.    OPERATING COSTS.

      (a)   The term OPERATING COSTS means those expenses (other than expenses
            for electricity) directly incurred in the management, operation,
            maintenance, repair, and security of the Project, including but not
            limited to the cost of all utilities, building supplies, janitorial
            service, maintenance, repairs, fire and extended coverage, public
            liability, and other insurance costs, all labor and employee benefit
            costs (including wages, salaries, and fees of all personnel engaged
            in the management, operation, maintenance, repair, and security of
            the Project), ad valorem taxes and assessments (both regular and
            special), costs that reduce operating expenses or are required to
            meet Applicable Laws [defined in Paragraph 14(a)], management fees,
            consulting fees, legal fees, accounting fees, the Building's share
            of fees, charges, taxes, expenses and other amounts due in
            connection with pedestrian tunnels, pedestrian skybridges,
            parking-garages, City of Dallas property required to be maintained
            or operated by Landlord, and other elements of the Project or other
            facilities that benefit the Building, and the fair market rental of
            the Project managers' offices, together with payments or credits
            Landlord makes to any tenant or tenants in the Project in lieu of
            Landlord providing any of the services or paying for any of the
            costs. If for any time period in question the Project is less than
            95% occupied, Landlord shall increase Operating Costs as though the
            Project were 95% occupied.

      (b)   The term EXCESS OPERATING COSTS means the amount by which the
            Operating Costs for any calendar year after the Base Year exceed the
            Operating Costs for the Base Year. Landlord shall calculate
            Operating Costs and Excess Operating Costs on a Rentable Square Foot
            basis by dividing the aggregate costs by the Total Building Area. If
            the amount of ad valorem taxes and assessments for the Base Year is
            subsequently modified, the modified amount is deemed to be the ad
            valorem taxes and assessments for the Base Year and is substituted
            for the original amount of taxes and assessments in the calculation
            of Operating Costs for the Base Year.

      (c)   If there are Excess Operating Costs for any calendar year, Tenant
            shall pay to Landlord as additional Rent an amount equal to the
            product of the Excess Operating Costs (on a Rentable Square Foot
            basis) multiplied by the number of Rentable Square Feet in the
            Leased Premises. If the amount of ad valorem taxes and assessments
            for the Base Year is reduced under subparagraph (b), Tenant shall
            pay to Landlord as

                                                                         PAGE 10
<PAGE>

            additional Rent any underpayment in Excess Operating Costs resulting
            from the recalculation of the Operating Costs for the Base Year
            within 30 days after delivery of any invoice therefor.

      (d)   On or before December 1 of the Base Year and each subsequent
            calendar year, Landlord shall deliver to Tenant Landlord's
            reasonable estimate of the Excess Operating Costs for the next
            calendar year. Tenant shall pay to Landlord monthly as additional
            Rent, in advance on or before the first day in each succeeding
            calendar month, an amount equal to one twelfth (l/12th) of the
            product of the number of Rentable Square Feet in the Leased Premises
            times Landlord's estimated Excess Operating Costs for the applicable
            calendar year. Landlord may adjust its estimate by notice to Tenant
            at any time during the applicable calendar year if actual Excess
            Operating Costs are substantially different from the estimate, and
            thereafter payments by Tenant under this Paragraph adjust
            accordingly. The term CALENDAR YEAR includes partial calendar years.

      (e)   No later than July 1 of each calendar year, Landlord shall deliver
            to Tenant a statement (EXCESS OPERATING COSTS STATEMENT) certified
            by an authorized representative of Landlord setting out in
            reasonable detail the actual Excess Operating Costs for the prior
            calendar year. If the estimated payments made by Tenant during the
            prior calendar year exceed Tenant's share of actual Excess Operating
            Costs for that year, Landlord shall credit the difference against
            the next ensuing installments of estimated payments by Tenant under
            this Paragraph. If the estimated payments made by Tenant during the
            prior calendar year under this Paragraph are less than Tenant's
            share of the actual Excess Operating Costs for that year, Tenant
            shall pay the amount of the difference to Landlord in cash within 30
            days after delivery of any invoice therefor by Landlord accompanied
            by a statement of the actual Excess Operating Costs for that year as
            additional Rent.

      (f)   Notwithstanding the foregoing, Operating Costs that are controllable
            (which excludes electricity, taxes, utilities and insurance) shall
            not increase, on a cumulative compounded basis by more than eight
            percent (8%) per year during the Lease Term.

      (g)   If Operating Costs for any calendar year (other than taxes, utility
            or insurance) increase by more than 5%, Tenant, at its expense, may
            inspect, audit, and copy Landlord's books and records concerning the
            applicable Excess Operating Costs Statement at Landlord's Project
            Manager's offices during normal office hours within 6 months after
            the date of the Excess Operating Costs Statement by giving Landlord
            at least 30 days' prior notice. Tenant may not be in Landlord's
            Project Manager's offices for more than a total of 5 business days.
            Tenant shall make reasonable efforts to minimize any disruption to
            Landlord's business while in Landlord's project manager's offices.
            Landlord will use reasonable efforts to cooperate with the conduct

                                                                         PAGE 11
<PAGE>

            of such audit. Tenant shall deliver to Landlord a copy of the audit
            within 10 days after it is finalized.

            -     If Tenant disputes any Excess Operating Costs Statement as a
                  result of its audit and Landlord does not contest the accuracy
                  of Tenant's dispute, within 10 business days after demand,
                  Landlord shall reimburse Tenant the amount of any overpayment
                  or Tenant shall pay Landlord the amount of any underpayment,
                  together with interest thereon from the date due until paid at
                  the Interest Rate. If Landlord contests the results of
                  Tenant's audit, Landlord and Tenant shall use reasonable
                  efforts to resolve their differences. If Landlord and Tenant
                  are unable to resolve their differences after using reasonable
                  efforts, then, prior to the institution of legal action,
                  Landlord and Tenant agree to attempt to resolve such dispute
                  by participating in non-binding mediation. If Tenant retains a
                  third party (AUDITOR) to audit any Excess Operating Costs
                  Statement, the Auditor must be a nationally recognized
                  accounting firm that is not being compensated by Tenant on a
                  contingency fee basis. Prior to conducting an audit, Tenant
                  and any Auditor shall execute Landlord's standard form of
                  confidentiality agreement relating to the audit.

            -     Tenant may not conduct an audit of any Excess Operating Costs
                  Statement if Tenant is in default under this Lease at the time
                  Tenant delivers its notice to Landlord requesting the audit or
                  at the time the audit would be conducted. Except for
                  Affiliate, as hereinafter defined, sublessees or assignees, no
                  subtenant may conduct an audit and no assignee may conduct an
                  audit for any period during which the assignee was not in
                  possession of the Leased Premises.

10.   SECURITY DEPOSIT. Intentionally Deleted.

11.   ASSIGNMENT AND SUBLETTING.

      (a)   Tenant may not, without Landlord's prior written consent, except as
            specified in subparagraph 11(i) below; (1) assign or transfer this
            Lease or any interest therein; (2) permit any assignment of this
            Lease or any interest therein by operation of law; (3) sublet the
            Leased Premises or any part thereof; (4) grant any license,
            concession, or other right of occupancy of any portion of the Leased
            Premises; (5) mortgage, pledge, or otherwise encumber its interest
            in this Lease; or (6) permit the use of the Leased Premises by any
            parties other than Tenant and its employees. Landlord's consent to
            any assignment, subletting, or reorganization is not a waiver of
            Landlord's right to approve or disapprove any subsequent assignment,
            subletting, or reorganization. Tenant and any guarantor of Tenant's
            obligations under this Lease (GUARANTOR, whether one or more) shall
            remain jointly and severally liable for the

                                                                         PAGE 12
<PAGE>

            payment of Rent and performance of all other obligations under this
            Lease after any assignment or subletting. If Tenant is a
            partnership, Tenant, Guarantor, and the general partners of Tenant
            prior to its reorganization shall remain jointly and severally
            liable for the payment of Rent and performance of all other
            obligations under this Lease after any reorganization.

      (b)   If an Event of Default (defined in Paragraph 27) occurs while the
            Leased Premises or any part thereof are assigned or sublet,
            Landlord, in addition to any other remedies under this Lease or
            provided by law, may at its option collect directly from the
            assignee or sublessee all rents payable to Tenant under the
            assignment or sublease and apply the rent against any sums due to
            Landlord under this Lease. Tenant authorizes and directs any
            assignee or sublessee to make payments of rent directly to Landlord
            upon receipt of notice from Landlord. No direct collection of rent
            by Landlord from any assignee or sublessee is a novation or a
            release of Tenant or Guarantor from the performance of their
            obligations under this Lease or under any guaranty executed by
            Guarantor. Receipt by Landlord of rent from any assignee, sublessee,
            or occupant of the Leased Premises is not a waiver of the covenant
            against assignment and subletting or a release of Tenant or
            Guarantor.

      (c)   If Tenant wants to assign or sublease all or part of the Leased
            Premises, it shall deliver a notice to Landlord specifying the name
            of, financial information for, and the nature of the business of the
            proposed assignee or subtenant, and the proposed effective date of
            the assignment or sublease. Tenant may not assign or sublease all or
            any part of the Leased Premises at any time when Tenant is in
            default under this Lease, whether or not an Event of Default has
            occurred.

      (d)   Landlord has a period of 20 days from receipt of Tenant's notice to
            notify Tenant that Landlord elects, in Landlord's sole discretion,
            to:

            (1)   terminate this Lease as to the space that is the subject of
                  Tenant's notice as of the date specified by Tenant, and if
                  more than thirty percent (30%) of the Leased Premises, whether
                  through one or more transactions, will be subject to
                  assignments or subleases as a results of the proposed sublease
                  or assignment, Landlord shall have the right to terminate the
                  Lease in its entirety;

            (2)   consent to the assignment or sublease; provided, if the rent
                  payable to the Tenant by the sublessee is greater than the
                  Minimum Rent, fifty percent (50%) of the excess rent is
                  payable by Tenant as additional Rent to Landlord on the same
                  dates Tenant pays Minimum Rent; or

            (3)   refuse to consent to Tenant's assignment or sublease of that
                  space and to continue this Lease in effect.

                                                                         PAGE 13
<PAGE>

            If Landlord does not notify Tenant of Landlord's election within the
            20-day period, Landlord is deemed to elect option (3).

      (e)   Any change in a majority of the voting rights or other control
            rights of Tenant is an assignment for purposes of this Paragraph, If
            Tenant is a partnership, then any transfer of a general partnership
            interest is an assignment for purposes hereof.

      (f)   As a condition to the effectiveness of each assignment or
            subletting, and whether or not Landlord's prior consent is required
            for the assignment or subletting, Tenant shall pay to Landlord its
            reasonable administrative and legal costs in connection therewith,
            not to exceed $1,000.

      (g)   Any attempted assignment or sublease by Tenant or any attempted
            reorganization of Tenant in violation of the terms of this Paragraph
            is void.

      (h)   Tenant may not enter into any sublease, license, concession or other
            agreement for any use, occupancy or utilization of the Leased
            Premises that provides for a rental or other payment for the use,
            occupancy, or utilization based in whole or in part on the net
            income or profits derived by any person from the premises so leased,
            used, occupied, or utilized.

      (i)   Tenant may, without the prior consent of Landlord, sublet all or any
            part of the Leased Premises to an Affiliate (defined below), or
            assign this Lease to an Affiliate, so long as (i) Tenant provides
            Landlord a copy of the sublease or the assignment within 10 days
            after its execution, (ii) the transaction was not entered into as a
            subterfuge to avoid the obligations and restrictions of this Lease,
            (iii) the assignee or sublessee is engaged in a business customarily
            acceptable for a tenant in a first-class high-rise building in
            Dallas, Texas, (iv) the assignee's or sublessee's proposed use of
            the Leased Premises does not violate this Lease, and (v) the
            assignee's or sublessee's net worth, creditworthiness and financial
            standing is equal to or better than Tenant's as of the date of such
            assignment or sublease. Landlord has no obligation to recognize an
            Affiliate as the tenant under this Lease unless Landlord timely
            receives a complete copy of the assignment or sublease. Tenant and
            Guarantor remain jointly and severally liable for the payment of
            Rent and performance of all other obligations under this Lease after
            any assignment or subletting to an Affiliate. The term AFFILIATE
            means any entity that acquires all or part of Tenant, or that is
            acquired in whole or in part by Tenant, or which entity controls,
            directly or indirectly, Tenant. For purposes of this subparagraph,
            CONTROL means the possession, directly or indirectly, of the power
            to direct or cause the direction of the management and policies of a
            corporation, whether through the ownership of voting securities or
            by contract or otherwise.

                                                                         PAGE 14
<PAGE>

      (j)   If Landlord exercises its termination right set forth in
            subparagraph 11(d)(l) above, the number of reserved (if any) and
            unreserved parking spaces allocated to Tenant reduces
            proportionately, effective as of the date of termination.

      (k)   Notwithstanding the foregoing, Landlord will not unreasonably
            withhold its approval of an assignment of this Lease or a sublease
            of a portion of the Leased Premises so long as the following
            conditions are satisfied: (i) the assignee or sublessee is of a kind
            and type and has a net worth and creditworthiness comparable to
            other tenants customarily found in or comparable with first-class
            office buildings in the downtown Dallas central business district
            comparable to the Building; (ii) the assignee or sublessee is
            engaged in a business customarily acceptable for a tenant in a
            first-class office building in the downtown Dallas central business
            district comparable to the Building; (iii) the assignee's or
            sublessee's proposed use of the Leased Premises does not violate
            this Lease or any restriction applicable to the Building; (iv) at
            the time of such assignment or subletting, this Lease is in full
            force and effect and there is no uncured Event of Default; (v) the
            assignee or sublessee shall not use the Leased Premises or the
            Building in a manner that adversely interferes with, burdens the use
            of or otherwise increases the use of the public areas of the
            Project, any Building system, or the use of the elevators or any
            Building system; and (vi) in no event shall the following be
            considered as suitable assignees or sublessees under this Lease: any
            governmental body, agency or bureau (of the United States, any
            state, county, municipality or any subdivision thereof); any foreign
            government or subdivision thereof; any health care professional or
            health care service organization; schools or similar organizations;
            employment agencies; radio, television or other communication
            stations; restaurants; and retailers offering retail services from
            the Leased Premises.

      (l)   Notwithstanding the giving by Landlord of its consent to any
            sublease or assignment with respect to the Leased Premises, no
            sublessee or assignee may exercise any renewal options, expansion
            options, rights of first offer or similar rights under this Lease
            except in accordance with a separate written agreement entered into
            directly between such sublessee or assignee and Landlord, provided
            Tenant continues to be liable for the performance of all obligations
            hereunder, as increased or otherwise affected by the exercise of
            such rights. Tenant may not exercise any renewal options, expansion
            options, rights of first offer or similar rights under this Lease if
            Tenant has assigned any portion of its interest in this Lease or
            subleased any portion of the Leased Premises.

12.   REPAIR AND MAINTENANCE BY TENANT.

      (a)   Except for those repairs and maintenance obligations required to be
            undertaken by Landlord as expressly provided in this Lease, Tenant
            shall keep the Leased Premises [including, without limitation,
            Standard Improvements and Tenant Improvements

                                                                         PAGE 15
<PAGE>

            (both as defined in Exhibit F)] and all fixtures installed by or on
            behalf of Tenant in good and tenantable condition. Tenant shall
            promptly make all necessary non-structural repairs and replacements
            to its fixtures and Tenant Improvements, all at Tenant's expense,
            under the supervision and with the approval of Landlord. All repairs
            and replacements must be equal in quality and class to the original
            work. Without diminishing this obligation of Tenant, if Tenant fails
            to make any repairs and replacements within 15 days after the
            occurrence of the damage or injury, Landlord may at its option make
            the repairs and replacements and Tenant shall pay Landlord on demand
            as additional Rent the costs incurred by Landlord plus an
            administrative fee equal to 10% of the costs; provided, however,
            that with respect to any repair which reasonably requires more than
            15 days to complete, Landlord shall not have the right to make such
            repair or replacement as long as Tenant commences such repair within
            such 15 day period and thereafter diligently pursues such repair to
            completion.

      (b)   Tenant shall pay the cost of repairs and replacements due to damage
            or injury to the Project or any part thereof caused by any Tenant
            Party or by any malfunction or misuse of any equipment installed by
            or on behalf of Tenant. This amount is payable by Tenant to Landlord
            on demand as additional Rent, plus interest at the Interest Rate
            from the date of payment by Landlord until paid by Tenant. If Tenant
            requests Landlord to perform any maintenance or repairs to the
            Leased Premises, over and above the services required to be
            performed by Landlord pursuant to Paragraph 7, Tenant shall pay the
            actual cost thereof, plus an administrative fee equal to 10% of the
            actual cost thereof, to Landlord as additional Rent within 5
            business days after demand.

      (c)   Tenant also shall pay the actual cost, plus an administrative fee
            equal to 10% of the actual cost thereof, to Landlord as additional
            Rent within 5 days after demand, of replacing fluorescent light
            tubes in Building standard light fixtures located in the Leased
            Premises.

13.   ALTERATIONS AND ADDITIONS BY TENANT.

      (a)   Tenant may not make or permit any alterations, improvements, or
            additions in or to the Leased Premises or the Project without
            Landlord's prior consent. Provided Tenant has notified Landlord in
            writing at least 10 days prior to the commencement of any such work
            within the Leased Premises, Landlord will not unreasonably withhold
            its approval of non-structural alterations or physical additions to
            the Leased Premises which cost $10,000 or less in each case subject
            to the following limitations: (i) such alterations and additions
            will not impair the structural integrity of the Building, (ii) such
            alterations and additions will not affect the mechanical,
            electrical, plumbing, heating, air-conditioning or ventilation
            systems of the Leased Premises, (iii) such alterations and additions
            are accomplished in a good and workmanlike

                                                                         PAGE 16
<PAGE>

            manner and in accordance with all applicable governmental
            requirements, (iv) such alterations and additions are not visible
            from outside the Leased Premises, and (v) Tenant obtains all
            applicable governmental permits and approvals required in connection
            with such alterations and additions. All alterations, additions, and
            improvements made to, or fixtures or other improvements placed in or
            upon, the Leased Premises, whether temporary or permanent in
            character, by either party (except only Tenant's movable trade
            fixtures, office furniture, and equipment) are a part of the Project
            and are the property of Landlord when they are placed in the Leased
            Premises without compensation to Tenant. Alterations, improvements,
            and additions in and to the Leased Premises requested by Tenant must
            be made in accordance with complete and accurate plans and
            specifications and construction documents [including, without
            limitation, complete mechanical, electrical and plumbing (MEP)
            requirements] prepared by Tenant and approved in advance by
            Landlord. All work must be performed at Tenant's expense either by
            Landlord or by contractors and subcontractors approved in advance by
            Landlord. If the work is not performed by Landlord, then all work
            performed by Tenant's contractors and subcontractors is subject to
            the following conditions:

            (1)   Each contractor and subcontractor must deliver evidence
                  satisfactory to Landlord that the insurance specified on
                  EXHIBIT D is in force prior to commencing work.

            (2)   Tenant shall ensure that all workers are cooperative with
                  Project personnel and comply with all Project Rules and
                  Regulations.

            (3)   Tenant must deliver to Landlord evidence that Tenant has
                  obtained all necessary governmental permits and approvals for
                  the improvements or alterations prior to starting any work.

            (4)   All construction must be done in a good and workmanlike manner
                  and is subject to approval by Landlord during and after
                  construction to determine compliance with the approved plans
                  and specifications and construction documents, in its sole
                  discretion.

            (5)   Lien releases from each contractor and subcontractor must be
                  submitted to Landlord within 5 days after completion of the
                  work performed by the contractor or subcontractor.

            (6)   Within 30 days after completion of any improvements or
                  alterations, Tenant, at its cost, shall deliver to Landlord 2
                  reproducible copies of "as-built" plans and specifications
                  (1/8" scale) for each floor where alterations or improvements
                  were made.

                                                                         PAGE 17
<PAGE>

            All changes to the plans and specifications and construction
            documents are also subject to Landlord's prior approval.

      (b)   Tenant must use Landlord's fire protection contractor and must
            either (1) use Landlord's MEP engineer to prepare the MEP portions
            of the plans and specifications and construction documents, or (2)
            reimburse the cost of one review by Landlord's MEP engineer of the
            plans and specifications and the construction documents. Landlord
            shall cause its fire protection contractor and MEP engineer to
            perform the work for Tenant at Landlord's contracted rates.

      (c)   All alterations and improvements by Tenant must comply with all
            Applicable Laws. Tenant and its consultants must coordinate any
            alterations or additions relating to compliance with Access Laws
            with Landlord and Landlord's Access Law compliance plan for the
            Project in preparing the plans and specifications and construction
            documents. If Tenant's alterations or additions to the Leased
            Premises or the manner in which Tenant uses the Leased Premises
            cause Landlord to make any alterations or improvements to the
            Project to comply with the provisions of the Americans With
            Disabilities Act of 1990 (as amended), the Texas Architectural
            Barriers Act (as amended) [Tex. Rev. Civ. Stat. Ann. Art. 9102], and
            any similar law, rule or regulation relating to access by disabled
            persons to the Leased Premises or the Project (collectively, ACCESS
            LAWS), Tenant shall reimburse Landlord for the cost of the
            alterations or improvements upon demand as additional Rent. Neither
            Landlord's approval of Tenant's plans and specifications for the
            alterations or improvements nor Landlord's acceptance of Tenant's
            as-built plans is a confirmation or agreement by Landlord that the
            improvements and alterations comply with Applicable Laws.

      (d)   Within 30 days after Tenant installs any telephone or data cables,
            whether or not in connection with an alteration or addition to the
            Leased Premises, Tenant, at its cost, shall deliver to Landlord 2
            reproducible copies of "as-built" plans and specifications (1/8 "
            scale) showing the location of the telephone and data cables.

      (e)   As between Landlord and Tenant, for purposes of the insurance
            requirements of Paragraph 18, Tenant has an insurable interest in
            all of the Tenant Improvements and alterations made by Tenant in the
            Leased Premises, but all of the Tenant Improvements and alterations
            shall be surrendered to Landlord with the Leased Premises upon the
            expiration or earlier termination of the Lease as set forth in
            Paragraph 25 of the Lease.

14.   USE AND OCCUPANCY.

      (a)   The Leased Premises may be used and occupied by Tenant only for
            general business offices and incidental uses and for no other
            purpose without Landlord's prior consent, in its sole discretion.
            Tenant shall use and maintain the Leased Premises in a clean,

                                                                         PAGE 18
<PAGE>

            careful, safe, and proper manner and shall comply with all laws,
            ordinances, orders, rules, and regulations of all governmental
            bodies (state, federal, and municipal) applicable to or having
            jurisdiction over the use, occupancy, operation, and maintenance of
            the Leased Premises and the Project, including without limitations
            all applicable environmental laws and the Access Laws (those laws,
            ordinances, orders, rules, decisions, and regulations being called
            APPLICABLE LAWS).

      (b)   Tenant may not deface or injure the Leased Premises or the Project
            or any part thereof or overload the floors of the Leased Premises.
            Tenant may not commit waste or permit waste to be committed or cause
            or permit any nuisance on or in the Leased Premises or the Project.
            Tenant shall pay Landlord on demand as additional Rent for any
            damage to the Leased Premises or to any other part of the Project
            caused by any negligence or willful act or any misuse or abuse
            (whether or not the misuse or abuse results from negligence or
            willful acts) by Tenant or any Tenant Party or any other person
            (except Landlord or any of its agents, employees, or contractors)
            authorized by Tenant to enter upon the Leased Premises.

      (c)   Tenant may not use or allow the Leased Premises to be used for any
            purpose prohibited by any Applicable Law, or by any restrictive
            covenants applicable to the Project, or as a manned express mail
            pick up center for delivery services like Airborne and Federal
            Express, or for the sale of bakery products for dessert items
            including cookies, fudge slices, bar type cookies and cakes,
            cupcakes and brownies, whether the product is sold packaged or
            unpackaged if the sales would constitute more than 10% of Tenant's
            gross receipts, or for a mini-bank or bank. Tenant may not sell,
            purchase, or give away, or permit, except with Landlord's prior
            approval, the sale, purchase, or gift of food in any form by or to
            any Tenant Party or any other parties at the Leased Premises or the
            Project. Tenant also will not use any part of the Leased Premises
            for the following uses: health care services, telephone or telegraph
            agency, radio, television or other communication station, employment
            agency, public restaurant or bar, retail, wholesale or discount shop
            for sale of merchandise, retail service shop, school or classroom,
            or governmental or quasi-governmental bureau, department or agency.
            Tenant shall conduct its business and occupy the Leased Premises and
            control all Tenant Parties so as not to create any nuisance or
            interfere with, annoy, or disturb any other tenants in the Project
            or Landlord in its management of the Project and so as not to injure
            the reputation of the Project.

      (d)   Tenant may not erect, place, or allow to be placed any sign,
            advertising matter, stand, booth, or showcase in or upon the
            doorsteps, vestibules, halls, corridors, doors, walls, windows, or
            pavement of the Project visible outside the Leased Premises (except
            for lettering on the door or doors to the Leased Premises as allowed
            by the Rules and Regulations attached as EXHIBIT D) without the
            prior consent of Landlord; provided, however, that on the interior
            of any floor leased entirely by Tenant, Tenant may

                                                                         PAGE 19
<PAGE>

            install signage approved by Landlord, which approval shall not be
            unreasonably withheld, that is not visible from the exterior of the
            Leased Premises.

      (e)   Tenant may not use or allow or permit the Leased Premises to be used
            in any way or for any purpose that:

            (1)   Landlord deems hazardous on account of the possibility of fire
                  or other casualty;

            (2)   is visible from the exterior of the Leased Premises, adversely
                  affects ventilation in other areas of the Project, creates
                  unreasonable elevator loads, causes structural loads to be
                  exceeded, or creates unreasonable noise levels;

            (3)   increases the rate of fire or other insurance for the Project
                  or its contents or in respect of the operation of the Project;
                  or

            (4)   renders the Project uninsurable at normal rates by responsible
                  insurance carriers authorized to do business in the State of
                  Texas or renders void or voidable any insurance on the
                  Project.

            If insurance premiums are increased because of Tenant's use of the
            Leased Premises, then, in addition to any other remedies Landlord
            may have, Tenant shall pay the amount of the increase to Landlord as
            additional Rent within 5 days after demand.

15.   MECHANICS' LIENS - TENANT'S OBLIGATIONS.

      Tenant may not cause or permit any mechanic's or materialman's lien to be
      placed upon Landlord's interest in the Project or the Leased Premises or
      any part thereof or against Landlord's interest under this Lease by any
      contractor, subcontractor, laborer, or materialman performing any labor or
      furnishing any materials to Tenant for any improvement, alteration, or
      repair of or to the Leased Premises, the Project, or any part thereof. If
      any lien is filed on Landlord's interest or Tenant's interest in the
      Leased Premises, Tenant shall cause the same to be discharged of record
      within 20 days after filing. If Tenant does not discharge the lien within
      the 20-day period, then, in addition to any other right or remedy of
      Landlord, Landlord may, but is not obligated to, discharge the lien by
      paying the amount claimed to be due or by procuring the discharge of the
      lien by deposit in court or bonding. Any amount paid by Landlord relating
      to any lien not caused by Landlord, and all reasonable legal and other
      expenses of Landlord, including reasonable attorneys' fees, in defending
      any action or in procuring the discharge of any lien, with interest
      thereon at the Interest Rate from date of payment by Landlord until paid
      by Tenant, is payable by Tenant to Landlord on demand as additional Rent.

                                                                         PAGE 20
<PAGE>

16.   LIMITATIONS ON LIABILITY OF LANDLORD; WAIVER.

      (a)   To the fullest extent permitted by law, Tenant, on its behalf and on
            behalf of all Tenant Parties, waives all claims (in law, equity, or
            otherwise) against Landlord and Landlord's officers, directors,
            shareholders, partners, trustees, members, agents, employees,
            property manager and independent contractors (singularly, a Landlord
            Party and collectively, Landlord Parties) arising out of, knowingly
            and voluntarily assumes the risk of, and agrees that Landlord
            Parties are not liable to any Tenant Parties for any of the
            following:

            (1)   any injury or damage to person or property (including the
                  resulting loss of use, economic losses and consequential or
                  resulting damages of any kind from any cause) due to the
                  condition or design of, or any defect in, the Leased Premises
                  or Project that exists now or occurs in the future, except for
                  Landlord's gross negligence or willful misconduct;

            (2)   any injury or damage to person or property (including the
                  resulting loss of use, economic losses and consequential or
                  resulting damages of any kind from any cause) due to the
                  Leased Premises or Project or related improvements or
                  appurtenances being out of repair, or defects in or failure of
                  pipes or wiring, or backing up of drains, or the bursting or
                  leaking of pipes, faucets, and plumbing mixtures, or gas,
                  water, steam, electricity, or oil leaking, escaping, or
                  flowing into the Leased Premises, unless caused by Landlord's
                  willful misconduct or gross negligence;

            (3)   any loss or damage caused by the acts or omissions of other
                  tenants in the Project or of any other persons, excepting only
                  the willful misconduct or gross negligence of duly authorized
                  employees and agents of Landlord; or

            (4)   any loss or damage to property or person occasioned by theft,
                  fire, act of God, public enemy, injunction, riot,
                  insurrection, war, court order, requisition, order of
                  governmental authority, and any other cause beyond the control
                  of Landlord Parties.

      (b)   Notwithstanding the foregoing or anything else to the contrary
            contained in this Lease, the liability of Landlord to any Tenant
            Party for any default, indemnity by, or other obligation or
            liability of Landlord under this Lease is limited to the interest of
            Landlord in the Project. No Landlord Party has any personal
            liability for any amounts payable or obligations performable by
            Landlord under this Lease.

      (c)   The provisions of this Paragraph 16 shall survive the expiration or
            earlier termination of this Lease.

                                                                         PAGE 21
<PAGE>

17.   TENANT'S INDEMNIFICATION OF LANDLORD; ASSUMPTION; EMPLOYEES' CLAIMS.

      (a)   Tenant shall indemnify, defend, and hold Landlord Parties harmless
            from all fines, suits, losses, costs, liabilities, claims, demands,
            actions, and judgments (collectively, claims) arising out of or
            relating to any of the following:

            (1)   any breach or default in performance of any obligation on
                  Tenant's part to be performed under this Lease, whether before
                  or during the Lease Term or after its expiration or earlier
                  termination;

            (2)   any act, omission, negligence, or misconduct of Tenant or any
                  Tenant Party, or of any other person entering upon the Leased
                  Premises under or with the express or implied invitation or
                  permission of Tenant;

            (3)   any alterations, activities, work, or things done, permitted,
                  allowed, or suffered by Tenant Parties in, at, or about the
                  Leased Premises or the Project, including the violation by
                  Tenant or any Tenant Party of any law, ordinance, or
                  governmental order of any kind; and

            (4)   the occupancy or use by Tenant or any Tenant Party of the
                  Leased Premises or the Project.

      (b)   Tenant is not required to indemnify, defend, or hold Landlord
            Parties harmless from any claim, demand, fine, suit, loss,
            liability, action or judgment arising solely from Landlord's gross
            negligence or willful misconduct (except for damage to the Tenant
            Improvements or Tenant's personal property, fixtures, furniture, and
            equipment in the Leased premises to the extent that such damage is
            covered by insurance that Tenant is required to carry under this
            Lease (or would have been covered had Tenant carried the insurance
            required under the provisions of this Lease).

      (c)   If any Landlord Party is made a party to any litigation commenced
            against any Tenant Party or relating to this Lease or to the Leased
            Premises, against which Tenant has agreed to indemnify Landlord
            Parties pursuant to this Lease, then Tenant shall pay all costs and
            expenses, including attorneys' fees and court costs, incurred by or
            imposed upon the Landlord Party by virtue of the litigation. The
            amount of all costs and expenses, including attorney's fees and
            court costs, is a demand obligation payable by Tenant to Landlord as
            additional Rent bearing interest at the Interest Rate from the date
            of payment by Landlord until paid by Tenant.

      (d)   Deleted.

      (e)   The provisions of this Paragraph 17 survive the expiration or
            earlier termination of this Lease.

                                                                         PAGE 22
<PAGE>

      (f)   The indemnification provisions of this Paragraph 17 shall not be
            construed or interpreted as in any way restricting, limiting, or
            modifying Tenant's insurance or other obligations under this Lease
            and is independent of Tenant's insurance and other obligations under
            this Lease.

18.   TENANT'S INSURANCE.

      (a)   Tenant shall, at its expense, maintain at all times during the Lease
            Term (and prior to the Lease Term with respect to activities of
            Tenant under the Lease at the Project) insurance as set forth below:

            (1)   Commercial General Liability Insurance (1986 ISO Form or its
                  equivalent) written on an "occurrence" basis with respect to
                  the business carried on, in or from the Leased Premises and
                  Tenant's use and occupancy of the Leased Premises (including a
                  contractual liability) in an amount not less than $1,000,000
                  per occurrence and $2,000,000 general aggregate per location
                  for bodily injury and property damages (or with increased
                  limits as may be required from time to time by Landlord by
                  giving notice to Tenant) and without any deductible;

            (2)   Statutory Workers' Compensation Insurance in compliance with
                  the Worker's Compensation Laws of the state in which the
                  Leased Premises is located and including at least 100/500/100
                  Employers Liability Insurance.

            (3)   Excess/Umbrella Liability Insurance, applying on at least a
                  "following form" basis, with a minimum limit of $3,000,000
                  each Occurrence and Aggregate, where applicable; and

            (4)   "ISO Special Form" Property Insurance, including but not
                  limited to, coverage for:

                  (A)   All office furniture, trade fixtures, office equipment,
                        merchandise, and all other items of Tenant's property
                        in, on, at, or about the Leased Premises and the
                        Building, including property installed by, for, or at
                        the expense of Tenant;

                  (B)   Tenant Improvements; and

                  (C)   Except for Standard Improvements, all other
                        improvements, betterments, alterations, and additions to
                        the Leased Premises.

                  Tenant's Property Insurance must also fulfill the following
                  requirements:

                                                                         PAGE 23
<PAGE>

                  (AA)  It must be written on the equivalent of an ISO "Special
                        Form" Property Insurance Form or an equivalent form
                        acceptable to Landlord;

                  (BB)  It must include earthquake and flood as covered causes
                        of losses;

                  (CC)  It must include an agreed amount endorsement for not
                        less than one-hundred percent (100%) of the full
                        replacement cost (new without deduction for
                        depreciation) of the covered items and property; and

                  (DD)  It must have a deductible no greater than $25,000 for
                        each loss.

            It is the parties' intent that Tenant structure its property
            insurance program so that no coinsurance penalty is imposed and
            there are no valuation disputes with any insurer or with Landlord.
            The property insurance coverage must include vandalism and malicious
            mischief coverage.

      (b)   Tenant's policies must be written by an insurance company or
            companies with a current A.M. Best's rating of A- IX or better and
            be admitted to do business in the State of Texas. Landlord, any
            mortgagees, any lessor under any ground, primary, or master lease,
            and Landlord's property management company must be named as
            additional insureds without restriction under the liability,
            property and umbrella policies. Tenant shall obtain a written
            obligation on the part of each insurance company to notify Landlord
            at least 45 days prior to cancellation, non-renewal, or material
            reduction of the coverage.

      (c)   Tenant shall deliver copies of duly executed certificates of
            insurance to Landlord prior to occupying any part of the Leased
            Premises, and on an annual basis thereafter. If Tenant fails to
            comply with these insurance requirements, Landlord may obtain the
            required insurance and Tenant shall pay to Landlord on demand as
            additional Rent the premium cost thereof plus interest at the
            Interest Rate from the date of payment by Landlord until paid by
            Tenant.

19.   LANDLORD'S INSURANCE.

      Landlord shall carry, or cause to be carried: (A) Commercial General
      Liability Insurance with limits of liability of not less than $1,000,000
      each occurrence, single limit Bodily Injury and Property Damage combined;
      and (B) the equivalent of ISO Special Form Property Insurance insuring the
      Project for the full replacement value thereof, excluding Tenant
      Improvements and Tenant's merchandise, trade fixtures, furnishings,
      equipment, personal property, and any alterations or additions made by
      Tenant.

20.   RIGHTS RESERVED BY LANDLORD.

                                                                         PAGE 24
<PAGE>

      Landlord reserves the following rights, exercisable without notice and
      without liability to, and without consent of, any Tenant Party for damage
      or injury to property, persons, or business and without effecting an
      eviction, constructive or actual, or disturbance of Tenant's use or
      possession or giving rise to any claim for set-off or abatement of Rent:

      (a)   To change the Building's or the Project's name or street address;
            provided Landlord shall reimburse Tenant for the cost of a 1 month
            supply of stationery.

      (b)   To install, affix, and maintain any signs on the exterior and
            interior of the Project.

      (c)   To designate and approve, prior to installation, all types of window
            shades, blinds, drapes, awnings, window ventilators, and similar
            equipment, and to control all internal lighting that is visible from
            the exterior of the Project.

      (d)   To designate, restrict, and control all sources within the Project
            where Tenant may obtain ice, drinking water, towels, toilet
            supplies, catering, food and beverages, and like or other services
            on the Leased Premises and, in general, the exclusive right to
            designate, limit, restrict, and control any business and any service
            in or to the Project and its tenants.

      (e)   To enter upon the Leased Premises with reasonable notice (except in
            the case of an emergency when no notice shall be required) at
            reasonable hours to inspect, clean, or make repairs or alterations
            to the Leased Premises (but without any obligation to do so, except
            as expressly specified in this Lease), to make repairs or
            alterations to any part of the Building or the Building systems
            (including adjacent premises), to show the Leased Premises to
            prospective lenders, purchasers, and, during the last 12 months of
            the Lease Term, to show the Leased Premises to prospective tenants
            at reasonable hours and, if the Leased Premises are vacant, to
            prepare them for re-occupancy. Notwithstanding the foregoing,
            Landlord shall not enter into areas previously designated in writing
            by Tenant as high security areas unless (i) Landlord shows cause
            therefor and is accompanied by a representative of Tenant, or (ii)
            in the event of an emergency. Landlord's obligations under this
            Lease shall be reduced to the extent of Tenant's refusal to grant
            access to such portions of the Leased Premises.

      (f)   To retain at all times, and to use in appropriate instances, keys to
            all doors within and into the Leased Premises. No locks may be
            changed or added without the prior consent of Landlord.

      (g)   To decorate and make repairs, alterations, additions, changes, or
            improvements, whether structural or otherwise, in and about the
            Project, and for those purposes to enter upon the Leased Premises
            and, during the continuance of the work, temporarily close doors,
            entryways, public space, and corridors in the Project, to interrupt
            or temporarily suspend Project services and facilities, and to
            change the arrangement

                                                                         PAGE 25
<PAGE>

            and location of entrances or passageways, doors and doorways,
            corridors, elevators, stairs, toilets, or other public parts of the
            Project, all without abatement or set off of Rent or affecting any
            of Tenant's obligations under this Lease, so long as the Leased
            Premises are reasonably accessible. In exercising the foregoing
            rights, Landlord agrees to use reasonable efforts not to
            unreasonably interfere with the conduct of Tenant's business in the
            Leased Premises, including making reasonable efforts to cause
            voluntary and intentional total interruptions of Essential Services
            to occur after Building Standard Hours.

      (h)   To have and retain a paramount title to the Leased Premises and the
            Project free and clear of any act of Tenant purporting to burden or
            encumber the Leased Premises or the Project.

      (i)   To grant to anyone the exclusive right to conduct any business or
            render any service in or to the Project, provided the exclusive
            right does not operate to exclude Tenant from the uses expressly
            permitted in this Lease.

      (j)   To approve the weight, size, and location of safes, heavy equipment,
            file cabinets, book shelves, and other heavy items in and about the
            Leased Premises and the Project and to require all those items and
            all furniture to be moved into and out of the Project and the Leased
            Premises only at times and in a manner specified by Landlord.
            Movements of Tenant's property into or out of the Project and within
            the Project are entirely at the risk and responsibility of Tenant.
            To require permits before allowing Tenant's property to be moved
            into or out of the Project.

      (k)   To take reasonable measures as Landlord deems advisable for the
            security of the Project and its occupants including, without
            limitation, the search of all persons entering or leaving the
            Project, the evacuation of the Project for cause, suspected cause,
            or for drill purposes, the temporary denial of access to the
            Project, and the closing of the Project after Building Standard
            Hours, subject to Tenant's right to admittance when the Project is
            closed after Building Standard Hours under reasonable regulations
            Landlord may prescribe from time to time.

      (1)   To transfer, assign, or convey, in whole or in part, the Project and
            Landlord's rights under this Lease. If Landlord transfers, assigns,
            or conveys its rights under this Lease, Landlord is released from
            any further obligations under this Lease and Tenant shall look
            solely to the successor in interest of Landlord for performance of
            the obligations of "Landlord" under this Lease.

                                                                         PAGE 26
<PAGE>

21.   FIRE OR OTHER CASUALTY.

      (a)   If the Leased Premises or any part thereof are damaged by fire or
            other casualty, Tenant shall give prompt notice thereof to Landlord.
            If the Project or the Building is so damaged by fire or other
            casualty that substantial alteration or reconstruction of the
            Project or the Building is, in Landlord's sole opinion, required
            (whether or not the Leased Premises are damaged) or if any mortgagee
            under a mortgage or deed of trust covering the Project requires that
            the insurance proceeds payable as a result of the fire or other
            casualty be used to retire the mortgage debt, Landlord may, at its
            sole option, terminate this Lease by giving Tenant notice of
            termination within 90 days after the date of the damage. If Landlord
            terminates this Lease under this Paragraph, the Rent abates as of
            the date of the damage.

      (b)   If Landlord does not elect to terminate this Lease, Landlord shall
            within 90 days after the date of the damage commence to repair and
            restore the Project (except that Landlord is not responsible for
            delays outside its control) to substantially the same condition in
            which it was immediately prior to the casualty. Upon such damage,
            Tenant shall assign to Landlord (or Landlord's designee) all
            insurance proceeds payable to Tenant under the property insurance
            required pursuant to Paragraph 18 (save and except proceeds paid for
            loss of Tenant's personal property) and Landlord shall repair and
            replace the Standard Improvements, Tenant Improvements and
            alterations installed in the Leased Premises; provided that Landlord
            shall in no event be obligated to expend for such repair or
            replacement amounts in excess of the insurance proceeds available to
            Landlord (over and above amounts going to the mortgagee of the
            Building and/or Project). Landlord is not liable for any
            inconvenience or annoyance to any Tenant Party or injury to the
            business of Tenant resulting in any way from casualty damage or the
            repairs; provided, during the time and to the extent the Leased
            Premises are unfit for occupancy, Landlord shall, either furnish
            Tenant with comparable office space at prevailing market rates or a
            fair diminution of Rent, in accordance with the mutual agreement of
            Landlord and Tenant at the time.

      (c)   If the damages are caused by the negligence or willful misconduct of
            any Tenant Party, Rent does not abate and Tenant shall pay to
            Landlord on demand as additional Rent any damages in excess of the
            amount paid by insurance proceeds received by Landlord.

22.   CONDEMNATION.

      (a)   If all or substantially all of the Project or the Building is taken
            for any public or quasi-public use under any governmental law,
            ordinance, or regulation or by right of eminent domain or is sold to
            the condemning authority in lieu of condemnation, then this Lease
            terminates as of the date which is 7 days prior to the date when
            physical

                                                                         PAGE 27
<PAGE>

            possession of the portion of the Building or Project is taken by the
            condemning authority. If less than all or substantially all of the
            Project or the Building is taken or sold, Landlord (whether or not
            the Leased Premises are affected) may terminate this Lease by giving
            notice to Tenant within 90 days after the right of election accrues,
            in which event this Lease terminates as of the date which is 7 days
            prior to the date when physical possession of the portion of the
            Building and Project is taken by the condemning authority.

      (b)   If this Lease is not terminated upon any taking or sale of less than
            all or substantially all of the Project:

            (1)   the Rent reduces by an amount representing that part of the
                  Rent properly allocable to the portion of the Leased Premises
                  taken or sold; and

            (2)   Landlord shall, at Landlord's sole expense, restore the
                  Project to substantially its former condition to the extent
                  reasonably deemed feasible by Landlord, but:

                  (A)   Landlord's restoration obligation does not exceed the
                        scope of the work done by Landlord in originally
                        constructing the Project and installing Standard
                        Improvements in the Leased Premises; and

                  (B)   Landlord is not required to spend for the work an amount
                        in excess of the amount received by Landlord as
                        compensation or damages (over and above amounts going to
                        the mortgagee of the property taken) for the part of the
                        Project so taken.

                  (C)   Landlord is entitled to receive all of the compensation
                        awarded upon a taking of any part or all of the Project,
                        including any award for the value of the unexpired Lease
                        Term. Tenant is not entitled to and expressly waives all
                        claim to any compensation; provided, Tenant is entitled
                        to receive any award for damages to the Tenant
                        Improvements not paid for by Landlord.

23.   TAXES ON TENANT'S PROPERTY.

      Tenant shall pay, and indemnify, defend, and hold Landlord harmless
      against, all taxes levied or assessed against personal property,
      furniture, fixtures, or other improvements placed by or for Tenant in the
      Leased Premises. If any taxes for which Tenant is liable are levied or
      assessed against Landlord or Landlord's property and if Landlord is
      required to pay the taxes or if the assessed value of Landlord's property
      is increased by inclusion of personal property, furniture, fixtures, or
      other improvements placed by or for Tenant in the Leased Premises and
      Landlord elects to pay the increased taxes, Tenant shall pay to Landlord
      on demand as

                                                                         PAGE 28
<PAGE>


      additional Rent that part of the taxes for which Tenant is liable under
      this Paragraph. If Landlord is advised of any increase in property
      valuation which could give rise to a property tax increase for which
      Landlord is entitled to indemnification under this Paragraph 23, then
      Landlord shall promptly notify Tenant of such increase and Tenant shall
      thereafter have the right to contest such increase provided Tenant
      contests such increase in accordance with all applicable laws as to
      Tenant's personal property only and Tenant either pays the resulting tax
      increase before it becomes due or provides Landlord with adequate security
      for the payment of such tax and any penalty and interest should the
      contest be denied.

24.   WAIVER OF SUBROGATION.

      Each party waives all claims that arise or may arise in its favor against
      the other party, or anyone claiming through or under them, by way of
      subrogation or otherwise, during the Lease Term or any extension or
      renewal thereof, for all losses of, or damage to, any of its property
      (whether or not the loss or damage is caused by the fault or negligence of
      the other party or anyone for whom the other party is responsible), which
      loss or damage is covered by valid and collectible fire and extended
      coverage insurance policies, to the extent that the loss or damage is
      recovered under the insurance policies. These waivers are in addition to,
      and not in limitation of, any other waiver or release in this Lease with
      respect to any loss or damage to property of the parties. Since these
      mutual waivers preclude the assignment of any claim by way of subrogation
      (or otherwise) to an insurance company (or any other person), each party
      shall immediately give each insurance company issuing to it policies of
      fire and extended coverage insurance written notice of the terms of these
      mutual waivers, and have the insurance policies properly endorsed, if
      necessary, to prevent the invalidation of the insurance coverages by
      reason of these waivers.

25.   SURRENDER UPON TERMINATION OR EXPIRATION; HOLDOVER.

      (a)   Upon the Expiration Date or any earlier termination of this Lease,
            Tenant shall: (1) surrender to Landlord possession of the Leased
            Premises in good repair and condition, reasonable wear and tear and
            damages or destruction by any insured casualty excepted, and (2)
            deliver to Landlord all keys to the Leased Premises and all parking
            access cards. If Tenant does not immediately surrender possession,
            Landlord may enter upon and take possession of the Leased Premises
            and expel or remove Tenant and any other person who may be occupying
            the Leased Premises, or any part thereof, by force if necessary,
            without having any civil or criminal liability therefor.

      (b)   If Tenant or any of its successors in interest continues to hold any
            part of the Leased Premises after the termination of this Lease, the
            holding over is a tenancy at sufferance at a monthly rental equal to
            175% of the monthly Minimum Rent payable at the time of termination,
            plus the payment of all other Rent payable under this Lease. While
            Tenant or its successor continues to hold the Leased Premises after
            the

                                                                         PAGE 29
<PAGE>

            termination of this Lease, the tenancy is subject to all terms of
            this Lease; provided, all expansion rights, first refusal rights,
            first notice rights, first offer rights, and renewal rights
            automatically terminate. Landlord shall have the right to terminate
            such tenancy at any time at will on one (1) day notice.

      (c)   No payments of money by Tenant to Landlord after the termination of
            this Lease reinstate, continue, or extend the Lease Term and no
            extension of this Lease after the termination or expiration thereof
            is valid unless it is reduced to writing and signed by Landlord and
            Tenant. Nothing in this Paragraph may be construed to give Tenant
            the right to hold over beyond the Expiration Date or any earlier
            termination of this Lease or preclude Landlord from having the right
            to dispossess or otherwise terminate Tenant's right of possession.
            Any month-to-month tenancy is terminable upon notice from Landlord.

26.   REMOVAL OF TENANT'S PROPERTY.

      (a)   All furniture, movable trade fixtures, and equipment installed by or
            on behalf of Tenant remains the property of Tenant and must be
            removed by Tenant at its sole risk and expense at the termination of
            this Lease, but may not be removed prior to the termination of this
            Lease without Landlord's prior consent. Any removal of Tenant's
            property must be accomplished in a good and workmanlike manner so as
            not to damage the Leased Premises or the Project. Tenant, or
            Landlord at Tenant's expense, shall repair any damage to the Leased
            Premises or the Project caused by any removal. All furniture,
            movable trade fixtures, and equipment installed by Tenant not
            removed within 15 days after termination of the Lease are
            conclusively presumed to be abandoned by Tenant. Landlord may, at
            its option, take the possession of the property (including any
            special use improvements) and either (1) declare it to be the
            property of Landlord by notice to Tenant or (2) at the sole risk and
            expense of Tenant and without payment of any compensation to Tenant,
            remove it or any part thereof in any manner, that Landlord chooses
            and store, sell, or otherwise dispose of it without incurring
            liability to Tenant or any other person. All amounts payable to
            Landlord under this Paragraph plus interest at the Interest Rate
            from date of payment by Landlord until paid by Tenant are due on
            demand as additional Rent.

      (b)   Upon request of Landlord, Tenant shall also remove, at its sole risk
            and expense, any special use improvements installed by or on behalf
            of Tenant in connection with the completion of the Tenant Finish
            Work (as defined in EXHIBIT F), any Additional Work, or otherwise.
            The term SPECIAL USE IMPROVEMENTS means all special improvements
            installed specifically for use by Tenant and includes, without
            limitation, telephone and data cables, computer floors and cables,
            cafeteria equipment, telephones and telephone equipment,
            supplemental air conditioning units and related equipment, equipment
            supplying excess electricity to the Leased Premises, and similar
            items. Any removal must be accomplished in a good and

                                                                         PAGE 30
<PAGE>

            workmanlike manner so as not to damage the Leased Premises or the
            Project. Tenant, or Landlord at Tenant's expense, shall repair any
            damage to the Leased Premises or the Project caused by any removal.

27.   EVENTS OF DEFAULT.

      The following are events of default (EVENTS OF DEFAULT) by Tenant under
      this Lease:

      (a)   Tenant fails to pay any Rent when due and the failure continues for
            a period of 5 days.

      (b)   Tenant fails to comply with any of the terms of this Lease, other
            than the payment of Rent, and does not cure the failure within 20
            days after Landlord delivers notice of the failure to Tenant or, if
            such failure is one which cannot be cured within such 20 day period,
            Tenant fails to begin curing such failure within such 20 day period
            and diligently pursue such cure to completion within 40 days after
            the expiration of such 20 day period.

      (c)   Tenant or Guarantor becomes insolvent, makes a transfer in fraud of
            creditors, commits any act of bankruptcy, makes an assignment for
            the benefit of creditors, or admits in writing its inability to pay
            its debts as they become due.

      (d)   Tenant or Guarantor files a petition under any section or chapter of
            the Bankruptcy Code of the United States, as amended, or under any
            similar law or statute of the United States or any state thereof, or
            Tenant or Guarantor is adjudged bankrupt or insolvent in proceedings
            filed against Tenant or Guarantor, or a petition or answer proposing
            the adjudication of Tenant or Guarantor as a bankrupt or its
            reorganization under any present or future federal or state
            bankruptcy or similar law is filed in any court and the petition
            or answer is not discharged or denied within 120 days after filing.

      (e)   A receiver or trustee is appointed for all or substantially all of
            the assets of Tenant or Guarantor or of the Leased Premises or of
            any of Tenant's property located therein in any proceeding brought
            by Tenant or Guarantor, or any receiver or trustee is appointed in
            any proceeding brought against Tenant or Guarantor and is not
            discharged within 120 days after appointment or Tenant or Guarantor
            shall consent to or acquiesce in the appointment.

      (f)   Tenant, if a natural person, dies or becomes incapacitated or, if
            Tenant is not a natural person, Tenant is dissolved or ceases to
            exist.

      (g)   Tenant's leasehold estate is taken on execution or other process of
            law in any action against Tenant.

                                                                         PAGE 31
<PAGE>

      (h)   Tenant does not conduct its business in any substantial portion of
            the Leased Premises for more than 5 days.

28.   LANDLORD'S REMEDIES.

      If an Event of Default occurs, Landlord may then or any time thereafter
      while the Event of Default continues and without any further notice or
      opportunity to cure except as expressly set forth in this Paragraph pursue
      any one or more of the following remedies:

      (a)   Terminate this Lease (without terminating Tenant's obligation to pay
            Rent for the balance of the Lease Term) by giving notice to Tenant,
            in which event Tenant shall immediately surrender the Leased
            Premises to Landlord. If Tenant fails to surrender the Leased
            Premises, Landlord may, without prejudice to any other remedy it has
            for possession or arrearages in Rent, take possession of the Leased
            Premises and expel or remove Tenant and any other person occupying
            the Leased Premises, or any part thereof, without being liable for
            prosecution or any claim of damages. Tenant shall pay to Landlord on
            demand as additional Rent the amount of all loss and damage Landlord
            suffers by reason of the termination, whether through inability to
            relet the Leased Premises on satisfactory terms or otherwise. Except
            to the extent required by law, Landlord has no duty to re-let the
            Leased Premises. Landlord's damages specifically include, but are
            not limited to: (1) all reasonable expenses necessary to re-let the
            Leased Premises including the cost of renovating, repairing, and
            altering the Leased Premises for a new tenant or tenants,
            advertisements, and brokerage fees; and (2) any increase in
            insurance premiums caused by the vacancy of the Leased Premises.
            Nothing in this Lease limits Landlord's right to prove and obtain in
            bankruptcy or insolvency proceedings damages by reason of the
            termination of this Lease in an amount equal to the maximum allowed
            by any statute or rule of law in effect at the time when the damages
            are to be proved, whether or not the amount is greater, equal to, or
            less than the amount of the loss or damages referred to above.

      (b)   Take possession of the Leased Premises and remove Tenant or any
            other person occupying the Leased Premises, or any part thereof,
            without having any civil or criminal liability and without
            terminating this Lease. Landlord may (but is under no obligation,
            except as may be required by law, to) re-let the Leased Premises or
            any part thereof for the account of Tenant, in the name of Tenant or
            Landlord or otherwise, without notice to Tenant for a term or terms
            (which may be greater or less than the period that would otherwise
            have constituted the balance of the Lease Term) and on conditions
            (which may include concessions or free rent) and for uses as
            Landlord in its sole discretion may determine. Landlord may collect
            and receive any rents payable by reason of any re-letting. Tenant
            shall pay Landlord on demand as additional Rent all reasonable
            expenses necessary to re-let the Leased Premises, which includes the
            cost of renovating, repairing, and altering the Leased Premises for
            a new tenant or tenants, advertisements, and brokerage fees, as well
            as any deficiency

                                                                         PAGE 32
<PAGE>

            that may arise by reason of the reletting. Landlord is not liable
            for any failure to re-let the Leased Premises or any part thereof or
            for any failure to collect any Rent due upon any re-letting. No
            taking of possession of the Leased Premises by Landlord is an
            election on Landlord's part to terminate this Lease unless a notice
            of termination is given to Tenant under subparagraphs (a) or (e).

      (c)   Enter upon the Leased Premises without having any civil or criminal
            liability and do whatever Tenant is obligated to do under the terms
            of this Lease. Tenant shall reimburse Landlord on demand as
            additional Rent for any expenses Landlord incurs in performing
            Tenant's obligations under this Lease, together with interest at the
            rate of 18% per annum from the date incurred until repaid by Tenant.
            Landlord is not liable for any damages resulting to Tenant from
            Landlord's actions or omissions in performing Tenant's obligations,
            whether caused by the negligence of Landlord or otherwise.

      (d)   Interrupt or cause the interruption of any utility service serving
            the Leased Premises, deactivate Tenant's parking access cards,
            suspend elevator service to the Leased Premises, remove, alter, or
            change any door, window, attic hatchway cover to the Leased
            Premises, or any lock, latch, hinge, hinge pin, doorknob, or other
            mechanism connected to any door, window, or attic hatchway cover to
            the Leased Premises, and intentionally prevent Tenant from entering
            the Leased Premises without resort to judicial process. Landlord is
            under no obligation to restore any door, window, or attic hatchway
            cover or any lock, latch, hinge, hinge pin, doorknob, or other
            mechanism attached thereto or to deliver or make available to Tenant
            any key to any door, window, or attic hatchway cover until Tenant
            fully cures all Events of Default then existing under this Lease.

      (e)   Terminate this Lease and forthwith repossess the Leased Premises and
            remove all persons or property therefrom, and be entitled to recover
            forthwith as damages a sum of money equal to the total of (i) the
            cost of recovering the Leased Premises (including, without
            limitation, attorneys' fees and costs of suit), (ii) the cost as
            reasonably estimated by Landlord of any alterations of, or repairs
            to, the Leased Premises which are necessary or proper to prepare the
            same for reletting, (iii) the unpaid Rent owed at the time of
            termination, plus interest thereon from due date at the rate of 18%
            per annum, (iv) the present value of the balance of the Rent for the
            remainder of the Term less the present value of the fair market
            rental value (and in computing the fair market rental value the
            factors taken into account shall include without limitation the
            market rental concessions and the time necessary to relet the Leased
            Premises) of the Leased Premises for said period (in each case using
            a discount rate of 8% per annum), and (v) any other sum of money and
            damages owed by Tenant to Landlord.

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      (f)   If Tenant violates Section 27 (h), then Landlord, as its sole and
            exclusive remedy, shall have the right, but not the obligation, at
            Landlord's sole option, to terminate this Lease by delivering to
            Tenant 30 days' prior written notice of the effective date of such
            termination.

      No repossession of or reentering all or any part of the Leased Premises,
      and no re-letting of the Leased Premises or any part thereof, relieves
      Tenant or Guarantor of any liabilities or obligations under this Lease,
      all of which survive repossession or re-entering by Landlord. If Landlord
      repossesses or re-enters all or any part of the Leased Premises after an
      Event of Default, Tenant shall pay to Landlord the Rent required to be
      paid by Tenant. No right or remedy of Landlord under this Lease is
      intended to be exclusive of any other right or remedy. Each right and
      remedy of Landlord is cumulative and all other rights or remedies under
      this Lease or now or hereafter existing at law, in equity or by statute.
      In addition to other remedies provided in this Lease, Landlord is
      entitled, to the extent permitted by applicable law, to injunctive relief
      in case of the violation, or attempted or threatened violation, of any of
      the terms of this Lease, or to a decree compelling specific performance of
      the terms of this Lease. Notwithstanding anything in this Lease to the
      contrary, if Landlord is deemed to have a duty to mitigate its damages
      arising from a default by Tenant under this Lease, then Landlord's duty to
      mitigate shall be limited to using reasonable and good faith efforts to
      relet the Leased Premises, which duty to relet the Leased Premises shall
      not (i) require Landlord to give priority to the Leased Premises over
      other premises owned or managed by Landlord or its affiliates, (ii)
      require Landlord to relet for less than market rent, or (iii) require
      Landlord to relet to a tenant (or for a use) which is not in keeping with
      the first-class character of the Project.

29.   NO IMPLIED WAIVER.

      The failure of Landlord or Tenant to insist at any time upon the strict
      performance of any of the terms of this Lease or to exercise any option,
      right, power, or remedy contained in this Lease is not a waiver of the
      right or remedy for the future. The waiver of any breach of this Lease or
      violation of the Rules and Regulations attached to this Lease does not
      prevent a subsequent act, which would have originally constituted a breach
      or violation, from having all the force and effect of an original breach
      or violation. No express waiver affects any terms other than the ones
      specified in the waiver and those only for the time and in the manner
      specifically stated. Acceptance by Landlord of any Rent after the breach
      of any of the terms of this Lease or violation of any Rule or Regulation
      is not a waiver of the breach or violation or the right to collect
      applicable late charges and interest, and no waiver by Landlord of any of
      the terms of this Lease is effective unless expressed in writing and
      signed by Landlord.

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30.   WAIVER BY TENANT.

      Tenant waives and surrenders for itself and all persons or entities
      claiming by, through, and under it, including creditors of all kinds: (A)
      any right and privilege which it or any of them has under any present or
      future constitution, statute, or rule of law to redeem the Leased Premises
      or to have a continuance of this Lease for the Lease Term after
      termination of Tenant's right of occupancy by order or judgment of any
      court or by any legal process or writ, or under the terms of this Lease;
      (B) the benefits of any present or future constitution, statute, or rule
      of law that exempts property from liability for debt or for distress for
      Rent; (C) any provision of law relating to notice or delay in levy of
      execution in case of eviction of a tenant for nonpayment of Rent; (D) any
      rights, privileges, and liens set out under Sections 91.004 and 93.003 of
      the Texas Property Code (as amended), and Tenant exempts Landlord from any
      liability or duty thereunder; and (E) any rights of Tenant to contest
      reappraisals of the Project (but not ad valorem taxes on Tenant's personal
      property in the Leased Premises) under Sections 41.143 and 42.015 of the
      Texas Tax Code (as amended).

31.   ATTORNEYS' FEES AND LEGAL EXPENSES.

      If either party files litigation concerning the interpretation or
      enforcement of this Lease, the prevailing party is entitled to recover
      from the losing party the prevailing party's reasonable attorneys' fees,
      court costs, and expenses, whether at the trial or appellate level.

32.   SUBORDINATION.

      (a)   This Lease and all rights of Tenant under this Lease are subject and
            subordinate to:

            (1)   any mortgage or deed of trust secured by a first lien against
                  the Project;

            (2)   all increases, renewals, modifications, consolidations,
                  replacements, and extensions of any first lien mortgage or
                  deed of trust;

            (3)   all ground, primary, or master leases now or hereafter
                  affecting the Building, the Project, or any portion thereof;
                  and

            (4)   all leases, restrictions, easements, and encumbrances recorded
                  in the Real Property Records of Dallas County, Texas, to the
                  extent they validly affect the Project.

            Tenant shall, upon demand at any time or times, execute,
            acknowledge, and deliver to Landlord, or to Landlord's first
            mortgagee or any lessor, any instruments that may be necessary or
            proper to more effectively effect or evidence this subordination to
            any first mortgage, first deed of trust, or ground, primary, or
            master lease.

                                                                         PAGE 35
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      (b)   If any first mortgage or first deed of trust against the Project is
            foreclosed, or if any ground, primary, or master lease is
            terminated, Tenant shall, upon request by the purchaser at the
            foreclosure sale or the lessor under any ground, primary or master
            lease:

            (1)   attorn to the purchaser or lessor and recognize the purchaser
                  or lessor as "Landlord" under this Lease; and

            (2)   execute, acknowledge, and deliver to the purchaser or lessor
                  an instrument in appropriate form acknowledging the
                  attornment.

      (c)   Tenant waives the provisions of any statute or rule of law, now or
            hereafter in effect, that may give or purport to give Tenant any
            right or election to terminate or otherwise adversely affect this
            Lease and the obligations of Tenant under this Lease if any
            foreclosure sale or ground, primary, or master lease termination
            occurs. This Lease is not affected in any way whatsoever by any
            foreclosure sale or ground, primary or master lease termination
            unless the holder(s) of the indebtedness or other obligations
            secured by the mortgages or deeds of trust declare otherwise.

      (d)   Notwithstanding the foregoing, any such first mortgagee or holder of
            a first deed of trust or lessor under a ground, primary, or master
            lease shall have the right, unilaterally, at any time to fully or
            partially subordinate any such mortgage, deed of trust, or ground,
            primary or master lease or other security instruments to this Lease
            on such terms and subject to such conditions as such first mortgagee
            or ground, primary, or master lessor may consider appropriate in its
            sole discretion. Upon request, Tenant shall execute an instrument
            confirming any such full or partial subordination.

      (e)   Notwithstanding the foregoing, Tenant shall have the right to
            approve any subordination and non-disturbance agreements required of
            Tenant, provided that Tenant hereby approves any subordination and
            non-disturbance agreement that is not materially different from the
            Subordination, Non-Disturbance and Attornment Agreement entered into
            by Tenant and Landlord's First Mortgagee in connection with the
            execution and delivery of this Lease.

33.   QUIET ENJOYMENT.

      If Tenant pays the Rent when due and timely performs all other obligations
      of Tenant under this Lease, then Tenant may peaceably and quietly enjoy
      the Leased Premises during the Lease Term without any disturbance from
      Landlord or from any other person claiming by, through, or under Landlord,
      but not otherwise, subject to the terms of this Lease and of the deeds of
      trust, mortgages, ground, primary, or master leases, pedestrian tunnel
      agreements,

                                                                         PAGE 36
<PAGE>

      skybridge agreements, parking garage operating agreements, ordinances,
      leases, utility easements, and agreements affecting the Project.

34.   NOTICE OF LANDLORD'S DEFAULT.

      If any act or omission by Landlord occurs that would give Tenant the right
      to damages from Landlord or the right to terminate this Lease due to
      c