Document:

exv10w26

Exhibit 10.26

CONSULTANT AGREEMENT

THIS CONSULTANT AGREEMENT (“Agreement”) is made this 27th day of February, 2009, by and
between CARBO Ceramics Inc., having a principal place of business at 6565 MacArthur Blvd., Suite
1050, Irving, TX 75039 (“Company”), and Paul Vitek, an individual residing at 638 Meadowview Lane,
Coppell, TX 75019 (“Contractor”).

Recitals

     WHEREAS, Contractor desires to assist Company and its subsidiaries in the performance of
certain projects or other tasks as may be assigned by the Company and more fully described herein;
and

     WHEREAS, Company desires to engage Contractor to perform such services upon the terms and
conditions set forth herein;

NOW THEREFORE, the parties hereto agree as follows:

1. Term. This Agreement shall become effective on the date first mentioned above and will
continue in effect until December 31, 2009, unless earlier terminated as provided herein.

2. Project Services. Contractor agrees to perform the consulting services (“Services”)
described in Exhibit A hereto, which is incorporated herein by reference.

3. Termination. This Agreement may be terminated as follows: (a) Company may terminate
this Agreement immediately if Contractor breaches the Agreement, or (b) upon 30 days written notice
to the other party, Company or Contractor may terminate this Agreement at any time, with or without
cause, at its convenience.

4. Payment for Project Services. As full consideration for the Services to be performed by
Contractor, Company agrees to pay Contractor in accordance with the fee schedules set forth in
Exhibit A attached hereto, which is incorporated herein by reference. Company shall not be
obligated to reimburse Contractor for services or fees not set forth in Exhibit A. If the Company
terminates for convenience pursuant to Section 3 above, it will pay Contractor for all fees and
expenses incurred as specified in Exhibit A prior to termination.

5. Restrictive Covenants. Contractor represents and warrants that it is under no
obligation or restrictions, nor will it assume any such obligation or restriction, that would in
any way interfere or be inconsistent with the Services to be furnished by Contractor under this
Agreement. In providing Services under this Agreement, Contractor understands that Company does
not wish to receive from Contractor any information that may be confidential or proprietary to
Contractor.

6. Additional Responsibilities of Contractor. Contractor agrees, covenants, and
represents that because Contractor is an independent contractor and is not an employee of Company,
(i) Contractor shall be responsible for paying any federal, state or local payroll, social
security, disability, worker’s compensation, self-employment insurance, income and other taxes or
assessments owed in connection with the Services. Contractor shall at Contractor’s expense, pay
and be fully liable and responsible for, any and all taxes relating to any compensation paid
pursuant to this Agreement. Contractor shall not be eligible to participate in Company’s worker’s
compensation, unemployment, disability, medical, dental, life or any other insurance programs, or
any other benefit or program that is sponsored, financed or provided by the Company for its employees due to the relationships created by this Agreement.
Further, Contractor shall be responsible for obtaining all applicable business licenses.

 

 

CONSULTANT AGREEMENT

7. Confidentiality. “Confidential Information” as used in this Agreement includes but is
not limited to the following: technical, economic, financial, marketing, research and development,
scientific studies, analyses, training methods, new products or new uses for old products,
merchandising and selling techniques, customer lists, contracts, licenses, accounting, business
systems and computer programs, long-range planning, financial plans and results, or other
information which is not common knowledge among competitors or other companies who may like to
possess such information. Contractor shall not disclose the Company’s Confidential Information to
others outside the Company, without Company’s prior written permission. Contractor shall not use
any Confidential Information for Contractor’s own benefit. This paragraph is in addition to and
not in replacement of any and all similar agreements and covenants previously entered into between
Contractor and Company .

8. Intellectual Property. Any inventions or ideas created by Contractor during the term of
this Agreement and one (1) year after termination or expiration of this Agreement shall be the
property of Company to the extent they relate to the Services. Contractor shall communicate to
Company all ideas, concepts, discoveries, improvements, or inventions conceived or made by
Contractor during the course of this Agreement and relating to Company’s business or utilizing
Company’s information, equipment, or property (“Intellectual Property”). Contractor shall assist
Company in obtaining the appropriate protection for intellectual property and shall sign all
necessary documents to protect and assign to Company all Intellectual Property under this
Agreement.

9. Governing Law; Arbitration; Filing of Suit. This Agreement is made under and shall be
construed according to the Laws of the State of Texas. Any dispute arising out of this Agreement
which cannot be resolved to the mutual satisfaction of the parties shall be submitted for
arbitration by the American Arbitration Association in the State of Texas, County of Dallas, in
accordance with the rules and procedures of the American Arbitration Association. The award
rendered pursuant to such arbitration shall be final, and judgment may be entered upon it in
accordance with applicable law in any court having jurisdiction thereof. All parties shall bear
their own attorneys’ fees, costs and expenses of arbitration.

10. Amendment. This Agreement shall not be modified, amended, rescinded, canceled, or
waived in whole or in part, except by written amendment signed by an officer of Company and
Contractor.

11. Relationship of Parties. Contractor, in furnishing services to Company hereunder, is
acting only as an independent contractor, and not as an agent of Company. Nothing in this
Agreement shall be construed to create the relationship of employer and employee, master and
servant, or principal and agent, between Company, Contractor or any of Contractor’s employees.
This Agreement shall not be construed to be a partnership or joint venture. No employees or agents
of either party shall be deemed to be employees or agents of the other party for any reason
whatsoever.

12. Integration Clause. This Agreement, including exhibits, represents the complete and
integrated agreement of the parties with respect to the matters recited herein, and except as
expressly set forth herein, supersedes all prior or contemporaneous written or oral agreements or
understandings with respect hereto.

13. General Provisions. The rights and obligations specified in Paragraphs 6, 7 and 8
shall survive and continue after termination of this Agreement and shall bind the parties and their
legal representatives, successors, heirs, and assigns. Contractor agrees to comply with all
applicable federal, state and local laws, regulations, and ordinances. In the event of any
conflict, inconsistency, or ambiguity between provisions of this Agreement and the exhibits
attached hereto, the provisions of the Agreement shall control. If any provision of this Agreement (including the exhibits attached hereto) is deemed to
be invalid or unenforceable, the remainder of the Agreement shall continue in full force and effect
and shall in no way be impaired or invalidated.

Page 2 of 4

 

CONSULTANT AGREEMENT

IN WITNESS WHEREOF, the parties hereto have fully executed this Agreement as of the date first
written above.

	 	 	 	 	 
	COMPANY

 	 	 
	By:  	/s/ R. Sean Elliott
 	 	 
	 	Printed Name:  	R. Sean Elliott 	 	 
	 	Its:  	General Counsel, Corporate Secretary and Chief
Compliance Officer 	 	 
	 
	CONTRACTOR

 	 	 
	By:  	/s/ Paul G. Vitek
 	 	 
	 	Printed Name:  	Paul G. Vitek 	 	 
	 	S.S.N.: 	 	 	 

Page 3 of 4

 

CONSULTANT AGREEMENT

Exhibit “A”

SERVICES AND FEE SCHEDULE

	I.	 	General Advice and Questions

Contractor agrees to be available during normal business hours for consultation by phone or
E-mail to answer questions concerning the Company’s historical operations and other general
inquiries concerning the Company that are posed by the Company’s management team (“General
Advice”). The amount of time required for General Advice is not expected to exceed five hours
per week. General Advice shall be provided for a period of six months from the date of this
Agreement.

In exchange for providing the General Advice, Contractor shall be entitled to six monthly
retainer payments in the amount of $4,600 each ($27,600 in the aggregate). The first retainer
payment shall be payable upon the execution of this Agreement, with each additional installment
becoming payable on the fifth business day of each subsequent calendar month until paid in full.

	II.	 	M & A Services

Contractor shall provide general support and services in connection with a possible acquisition
opportunity with BBL Falcon Industries, Ltd. (“BBL Falcon”), including assistance with due
diligence, valuation, negotiations and other items as may be requested by the Company from time
to time (“M&A Services”).

Company shall pay Contractor a fee of $175 per hour for M&A Services provided to the Company,
plus reasonable out-of-pocket expenses for travel and related items. Within 10 days of the end
of each calendar month, Contractor shall submit to Company a reasonably detailed invoice for the
M&A Services provided during the prior month. The Company shall pay such invoices within 30
days of receipt.

In addition, if the Company completes and closes an Acquisition (defined below) while this
Agreement remains in effect and prior to December 31, 2009, the Company shall pay Contractor a
success fee equal to (i) $200,000 minus (ii) all other hourly fees paid to Contractor
for M&A Services prior to the date of the Acquisition. For the avoidance of doubt, in no event
shall the total amount of fees paid to Contractor in connection with the M&A Services exceed
$200,000.

As used above, “Acquisition” means a merger, consolidation, acquisition or sale of assets or
equity interests, or similar transaction involving the acquisition, ownership and control of
substantially all of the business, assets or equity interests of BBL Falcon by the Company or
one of its subsidiaries.

In exchange for the consideration offered by the Company in this Agreement, Contractor agrees
that prior to December 31, 2009, he shall exclusively represent the Company with respect to the
BBL Falcon opportunity, and shall not directly or indirectly represent, assist or otherwise aid
any third party (including BBL Falcon) in connection with M&A Services related to the possible
Acquisition. Notwithstanding the foregoing, if the Company decides that it will not pursue the
Acquisition prior to December 31, 2009, it shall consider in good faith the possibility of
releasing Contractor from these exclusivity obligations; it being expressly understood that any such release must be in writing
and signed by an officer of the Company.

Page 4 of 4exv10w27

Exhibit 10.27

OFFICE LEASE

LANDLORD:

I-10 EC CORRIDOR #2 LIMITED PARTNERSHIP,

a Delaware limited partnership

TENANT:

CARBO CERAMICS INC.,

a Delaware corporation

Regarding the Premises Located at:

Energy Center II

575 North Dairy Ashford, Suite 300

Houston, Texas

 

 

TABLE OF CONTENTS

	 	 	 	 	 	 	 
	Section	 	 	 	Page
	 
	 	 	 	 	 	 
	1.

	 	Basic Lease Terms
	 	 	1	 
	2.

	 	Demise and Use
	 	 	3	 
	3.

	 	[Intentionally Omitted]
	 	 	3	 
	4.

	 	Base Rent
	 	 	3	 
	5.

	 	Operating Expenses (Including Taxes)
	 	 	4	 
	6.

	 	Compliance
	 	 	10	 
	7.

	 	Parking
	 	 	11	 
	8.

	 	Hazardous Substances
	 	 	12	 
	9.

	 	Insurance
	 	 	12	 
	10.

	 	Indemnification
	 	 	14	 
	11.

	 	Damage or Casualty
	 	 	15	 
	12.

	 	Eminent Domain
	 	 	17	 
	13.

	 	Assignment and Subletting
	 	 	17	 
	14.

	 	Alteration by Tenant
	 	 	19	 
	15.

	 	Intentionally Omitted
	 	 	21	 
	16.

	 	Mortgagee Provisions, Estoppel and Subordination
	 	 	21	 
	17.

	 	Expiration of Lease and Surrender of Possession
	 	 	22	 
	18.

	 	Default
	 	 	23	 
	19

	 	Remedies
	 	 	24	 
	20.

	 	Miscellaneous
	 	 	26	 

	 	 	 
	EXHIBITS:	 	 
	Rider
	 	 
	Exhibit A — 1

	 	Outline of Premises
	Exhibit A — 2

	 	Legal Description of Land
	Exhibit A — 3

	 	Refusal Space
	Exhibit B

	 	Rules and Regulations
	Exhibit C — 1

	 	Work Letter
	Exhibit C — 2

	 	Preliminary Plans
	Exhibit C — 3

	 	Air Conditioned Shell Condition
	Exhibit D

	 	Confirmation of Lease Terms
	Exhibit E

	 	Form of SNDA
	Exhibit F

	 	Form of Estoppel Certificate
	Exhibit G

	 	Designated Smoking Area

ii

 

OFFICE LEASE

     THIS OFFICE LEASE is dated for identification purposes only as of January 20, 2009 (this
“Lease”), and is made by and between I-10 EC CORRIDOR #2 LIMITED PARTNERSHIP, a Delaware limited
partnership (“Landlord”), and CARBO CERAMICS INC., a Delaware corporation (“Tenant”).

IT IS AGREED AS FOLLOWS:

	1.	 	BASIC LEASE TERMS.

	 	 	 	 	 
	1.1

	 	Landlord’s Address for Notice:
	 	I-10 EC Corridor #2 Limited Partnership 

c/o Trammell Crow Company 

2800 Post Oak Boulevard, Suite 2300

Houston, Texas 77056

Attn: Asset Manager
	 
	 	 	 	 
	 

	 	With copy to:
	 	CB Richard Ellis Asset Services, Inc. 

585 North Dairy Ashford 

Houston, Texas 77079

Attn: General Manager of the Building
	 
	 	 	 	 
	 

	 	With copy to:
	 	I-10 EC Corridor #2 Limited Partnership 

c/o Principal Real Estate Investors 

801 Grand Avenue, Dept H-137

Des Moines, IA 50392-1370

Attn: Central CRE — Equities Team
	 
	 	 	 	 
	 

	 	Rent Payment Address:
	 	I-10 EC Corridor #2 Limited Partnership 

P.O. Box 301111

Property: 253310

Los Angeles, CA 90030-1111
	 
	 	 	 	 
	1.2

	 	Tenant’s Address for Notice:
	 	CARBO Ceramics Inc. 

575 North Dairy Ashford, Suite 300

Houston, TX 77079

Attn: Vice President of Human Resources
	 
	 	 	 	 
	 

	 	 	 	CARBO Ceramics Inc. 

575 North Dairy Ashford, Suite 300

Houston, TX 77079

Attn: General Counsel

1.3 Guarantor: None.

1.4 Premises: Suite No. 300 of the Building as shown on the floor plans attached hereto as
Exhibit A-1, containing approximately 22,159 rentable square feet of space, which is the
final agreement of the parties and is not subject to change.

1.5 Building: That certain building located at 575 North Dairy Ashford, Houston, Texas 77079.
The Building contains approximately 305,585 rentable square feet of space, which is the final
agreement of the parties and not subject to change.

1.6 Complex: The Building and the building and improvements located at 585 North Dairy Ashford,
Houston, Texas 77079, along with the Garage and the Land.

1

 

1.7 Garage: That certain parking garage associated with the Building.

1.8 Land: That certain real property on which the Building and Garage are located, the legal
description of which is attached as Exhibit A-2.

1.9 Lease Term: Eighty-six (86) full calendar months and any partial month.

1.10 Commencement Date: The earlier of (a) May 1, 2009, or (b) the date on which Tenant initially
performs normal business operations from the Premises. In the event that the Commencement Date is
later than May 1, 2009 as a result of a delay attributable solely to the negligence of Landlord or
its agents, employees or contractors (and not attributable to Force Majeure, Tenant or any third
party), then Tenant shall be entitled to one day of free Base Rent and Tenant’s Proportionate
Share of Operating Expenses for every one day of such delay after May 1, 2009. Tenant shall be
permitted access to the Premises prior to the Commencement Date for the purpose of constructing the
Tenant Improvements.

1.11 Expiration Date: The last day of the eighty-sixth (86th) full calendar
month following the Commencement Date.

1.12 Base Rent:

	 	 	 	 	 	 	 	 	 
	 	 	Annual	 	 
	Dates	 	Base Rent/RSF	 	Monthly Installment
	Commencement Date — Month 2
	 	$	19.75	 	 	$	0.00	*
	Month 3 — Month 12
	 	$	19.75	 	 	$	36,470.02	 
	Month 13 — Month 14
	 	$	22.25	 	 	$	41,086.48	 
	Month 15 — Month 26
	 	$	22.75	 	 	$	42,009.77	 
	Month 27 — Month 38
	 	$	23.25	 	 	$	42,933.06	 
	Month 39 — Month 50
	 	$	23.75	 	 	$	43,856.35	 
	Month 51 — Month 62
	 	$	24.25	 	 	$	44,779.65	 
	Month 63 — Month 74
	 	$	24.75	 	 	$	45,702.94	 
	Month 75 — Expiration Date
	 	$	25.25	 	 	$	46,626.23	 

 

			
	*	 	Such abatement shall apply solely to payment of the monthly installments of Base Rent, but shall
not be applicable to any other charges, expenses or costs payable by Tenant under this Lease
(including, without limitation, Tenant’s Proportionate Share of Operating Expenses, Taxes,
Insurance and Common Area Charges). Landlord and Tenant agree that the abatement of rental and
other payments contained in this Section is conditional and is made by Landlord in reliance upon
Tenant’s faithful and continued performance of the terms, conditions and covenants of this Lease
and the payment of all monies due Landlord hereunder. In the event that Tenant defaults under the
terms and conditions of the Lease, then the unamortized portion of all conditionally abated rental
shall become fully liquidated and immediately due and payable (without limitation and in addition
to any and all other rights and remedies available to Landlord provided herein or at law and in
equity).

1.13 Tenant’s Proportionate Share: 7.251%.

1.14 Base Year: None. There is a full pass through of Operating Expenses and Taxes (subject to the
conditional abatement set forth in Section 1.12 above).

1.15 Security Deposit: None.

1.16 Allowance: Seven Hundred Seventy-Five Thousand Five Hundred Sixty-Five and No/100ths Dollars
($775,565.00) (i.e., $35.00 per rentable square foot of space in the Premises), as more fully set
forth in the Work Letter, attached hereto as Exhibit C-1.

 1.17
Brokers: Landlord’s Broker: CB Richard Ellis, Inc.

2

 

	 	 	 	 	 
	 

	 	 	 	Tenant’s Broker: Studley, Inc.

1.18 Parking Spaces: Tenant and its employees, agents and invitees shall have the non-exclusive
right to use eighty-nine (89) Parking Spaces (i.e., four (4) Parking Spaces per 1,000 rentable
square feet of space in the Premises) in the Garage for the initial Lease Term and any renewals,
subject to (1) such Rules and Regulations (as defined herein) as Landlord may promulgate from time
to time and (2) rights of ingress and egress of other tenants and their employees, agents and
invitees. None of the Parking Spaces shall be assigned or reserved; provided, however, that Tenant
shall have the right to convert ten percent (10%) of its Parking Spaces to reserved Parking Spaces
upon thirty (30) days’ prior written notice to Landlord at no additional charge during the initial
Lease Term, the location of which shall be reasonably determined by Landlord following consultation
with Tenant. Landlord reserves the right to charge for guest parking during the primary Lease
Term. Tenant shall enter into a separate agreement with any applicable parking vendor, if
requested by Landlord.

1.19 Permitted Uses: General office uses in keeping with the first class nature of the Building.

	 	 	 	 	 	 	 	 	 	 	 	 	 
	 	1.20	 	 	Amount Due on Execution:	 	Base Rent for Month 3:
	 	$	36,470.02	 
	 	 	 	 	 	 	 	 	Operating Expenses for Month 1:
	 	$	20,312.42	 
	 	 	 	 	 	 	 	 	Security Deposit:
	 	$	0.00	 
	 	 	 	 	 	 	 	 	 
	 	 	 
	 	 	 	 	 	 	 	 	Total:
	 	$	56,782.44	 
	 	 	 	 	 	 	 	 	 
	 	 	 

2. DEMISE AND USE.

     (A) “As Is”. Landlord does hereby lease to Tenant and Tenant hereby accepts the
Premises on the terms set forth herein. TENANT ACKNOWLEDGES THAT IT HAS INSPECTED AND ACCEPTS THE
PREMISES IN ITS “AS-IS, WHERE IS” CONDITION (provided the foregoing shall not relieve Landlord of
its repair and maintenance obligations under this Lease). However, Landlord shall make all
improvements required under this Lease or the attached Work Letter, as applicable.

     (B) Delivery. If Tenant occupies the Premises prior to the Commencement Date, such
occupancy shall be subject to all provisions hereof and shall not advance the termination date, and
Tenant shall pay rent for such period at the initial monthly rate set forth below.

     (C) Permitted Use. Tenant covenants that the Premises will be used only for the
Permitted Use together with the incidental activities of Tenant, its affiliated companies or other
subsidiary companies and for no other use or purpose. Tenant further covenants that the Premises
will not be used or occupied for any unlawful purposes. Tenant further acknowledges that it has
received no written or oral inducements from Landlord or any of Landlord’s representatives
concerning this Lease (other than as specifically set forth herein) or that Tenant will be granted
any exclusive rights. Any use (other than the Permitted Use) that causes a material increase in
the cost of insurance carried by Landlord in connection with the Building shall be subject to
Landlord’s prior written approval, which approval shall not be unreasonably withheld, conditioned
or delayed. Notwithstanding anything in this Lease to the contrary, under no circumstances may any
portion of the Premises be used for any of the following purposes: governmental agencies,
consulates, foreign government agencies, foreign government entities, foreign consultants,
healthcare or medical care providers, call centers, collection agencies, or high employee density
uses (in excess of 1 person per 250 rentable square feet of space), or any uses prohibited by the
Protective Covenants (each a “Prohibited Use”).

3. [INTENTIONALLY OMITTED]

4. BASE RENT. Monthly installments of Base Rent and other amounts due hereunder (collectively,
“Rent”) are due on the first day of each month in advance without demand and without deduction,
abatement, or setoff during the Lease Term. Rent of any period during the Lease Term hereof which
is less than one month shall be a pro-rata portion of the monthly installment. Rent shall be
payable in lawful money of the United States to Landlord at the address stated herein or to such
other persons or at such other places as Landlord may designate in writing.

3

 

5. OPERATING EXPENSES (INCLUDING TAXES).

     (A) The term “Operating Expenses” shall include all costs of managing, insuring, repairing,
replacing, and operating the Building, Garage and Land, and associated common areas (including,
without limitation, landscaped areas, parking areas, hallways, lobbies, and common restrooms)
computed in accordance with generally accepted accounting principles. Landlord may equitably
allocate (in its reasonable judgment) among the buildings within the Complex any common Operating
Expenses. Operating Expenses include, without limitation, costs associated with any property
management office, fitness center and/or deli, and furniture, fixtures and equipment located
therein, as well as the costs associated with items (1) through (4) below

          (1) Taxes.

               (a) Landlord shall pay all taxes payable during the Lease Term before the same are delinquent.

               (b) As used herein, the term “taxes” shall include, without limitation: real estate taxes;
assessments (whether they be general or special); governmental charges that accrue against the
Premises, the Building, and the Land (whether federal, state, county, or municipal, and whether
imposed by taxing or management districts or authorities presently existing or hereafter created);
sewer rents; margin taxes; transit and transit district taxes; taxes based upon the receipt of
rent; and any other federal, state or local governmental charge, general, special, ordinary or
extraordinary, but excluding (1) taxes and assessments attributable to the personal property of any
tenant of the Complex, (2) any taxes imposed on any transfer of ownership of the Complex, and (3)
any inheritance, estate, succession, gift, franchise, corporation, income or profits tax (other
than the margin tax referenced above).

          (2) Services.

               (a) Generally. Provided that this Lease or Tenant’s right to possession of the
Premises have not been terminated, Landlord shall furnish to Tenant:

                    (i) 24 hours per day, every day of the year water (tempered and cold) provided for general use
of tenants of the Building;

                    (ii) heated and refrigerated air conditioning as appropriate, during normal working hours
(hereinafter defined) and at such other times as Landlord normally furnishes these services to all
tenants of the Building, and at such temperatures and in such in keeping with Comparable Buildings;

                    (iii) janitorial services (including trash removal) consistent with Comparable Buildings on
Business Days other than Holidays for Building-standard installations (Landlord reserves the right
to bill Tenant separately for extra janitorial service required for non-standard installations) and
such window washing as may from time to time in Landlord’s judgment be reasonably required but in
no event less than once per year;

                    (iv) 24 hours per day, every day of the year elevators for ingress and egress to the floors on
which the Premises are located and the Garage, in common with other tenants, provided that Landlord
may reasonably limit the number of elevators to be in operation at times other than during normal
working hours and on Holidays;

                    (v) replacement of Building-standard light bulbs and fluorescent tubes (but not incandescent
light bulbs, nonstandard fixtures, or other lamps of Tenant);

                    (vi) normal electrical current during normal business hours other than equipment whose
electrical energy consumption exceeds normal electrical usage defined below;

                    (vii) shared access to and use of the loading dock for Tenant’s loading, unloading, delivery,
and pick-up activities during normal business hours including the right to leave vehicles parked in
one of the four parking spaces in the loading dock area for enough time to load or unload and pick
up and deliver goods to and from the Premises, subject, however, to reasonable Rules and
Regulations as are promulgated by Landlord from time to time. Tenant shall also have access to and
use of the loading dock for the purposes set forth above after normal business hours but only by
contacting Landlord’s security personnel by telephone (which security personnel shall be available
for such purpose at all times and will respond promptly);

4

 

                    (ix) At all times during normal business hours, and subject to reasonable prior notice at all
other times, non-exclusive use of the Building freight elevators to the Premises, subject to
temporary cessation for ordinary repair and maintenance, and during times when life safety
systems override normal Business operating systems. Landlord shall use reasonable efforts to
accommodate Tenant’s scheduling needs; and

                    (x) access to the Premises twenty-four (24) hours a day every day of the year, subject to
reasonable Rules and Regulations for safety, security and energy conservation.

     Except as otherwise specifically provided herein, failure by Landlord to any extent to make
available, or any slowdown, stoppage or interruption of these services shall not render Landlord
liable in any respect for damage to either person, property or business, nor be construed an
eviction of Tenant or work an abatement or offset of Rent, nor relieve Tenant from fulfillment of
any covenant or agreement hereof. Except as provided below, should any equipment or machinery
furnished by Landlord breakdown or for any cause cease to function properly, Landlord shall use
reasonable diligence to repair same promptly, but Tenant shall have no claim for abatement of Rent
or damages on account of any interruption in service occasioned thereby or resulting therefrom. In
the event Tenant requests and Landlord provides any of the foregoing services or any other services
to Tenant at times outside normal working hours (any time other than 7:00 a.m. to 6:00 p.m. Monday
through Friday and 8:00 a.m. to Noon Saturday, specifically excluding Sundays and Holidays), then
Landlord shall have the right to bill Tenant and Tenant agrees to pay for such additional services.
The charge for after-hours HVAC is $45.00 per hour per air handling unit activated (“After Hours
Rate”). The After Hours Rate is subject to increase, but shall not exceed the percentage increase
in the actual average cost per kilowatt hour charged to Landlord by the utility providing
electricity to the Building over and above the actual average cost per kilowatt hour in effect as
of the Commencement Date. For purposes of this Lease provision, “Holidays” shall include New
Year’s Day, Memorial Day, July 4th, Labor Day, Thanksgiving and Christmas. Landlord shall also
have the right to require a separate meter, to meter Tenant’s electrical use within the Premises.
Following installation of said electrical meter, Tenant agrees to pay for such electricity in a
timely manner to either Landlord or directly to the electrical utility as determined by Landlord.
Tenant will not install or operate in the Premises any electrically operated equipment or machinery
that operates on greater than 220 volt power or exceeds normal electrical usage without first
obtaining the prior written consent of Landlord, which consent shall not be unreasonably withheld,
conditioned, or delayed. Landlord may condition such consent upon the payment by Tenant of
additional rent in compensation for the excess consumption of electricity or other utilities and
for the cost of any additional wiring or apparatus that may be occasioned by the operation of such
equipment or machinery. Tenant shall not install any equipment of any type or nature that will or
may necessitate any changes, replacements or additions to, or in the use of, the Building Systems
serving the Premises or the Building, without first obtaining the prior written consent of
Landlord, which consent shall not be unreasonably withheld, conditioned, or delayed. Business
machines and mechanical equipment belonging to Tenant which cause noise or vibration that may be
transmitted to the structure of the Building or to any space therein to such a degree as to be
objectionable to Landlord or to any tenant in the Building shall be installed and maintained by
Tenant, at Tenant’s expense, on vibration eliminators or other devices sufficient to reduce such
noise and vibration to a level satisfactory to Landlord. It is understood and agreed that “normal
electrical usage” includes the use, for normal general office purposes, of copying machines,
personal or desk-top computers and other standard office equipment, including a computer network
and related server system.

          (b) Service Interruption. Tenant agrees that Landlord shall not be liable in damages,
by abatement of Rent or otherwise, for failure to furnish or delay in furnishing any service, or
for any diminution in the quality or quantity thereof, when such failure or delay or diminution is
occasioned, in whole or in part, by Force Majeure (defined below) after commercially reasonable
efforts by Landlord so to do, by any accident or casualty whatsoever by act or default of Tenant or
other parties, or by any cause beyond Landlord’s reasonable control. Such failures or delays or
diminution shall never be deemed to constitute an eviction or disturbance of Tenant’s use and
possession of the Premises or relieve Tenant from paying Rent or performing any of its obligations
under this Lease, except as expressly set forth in this Lease. Notwithstanding anything to the
contrary contained in this paragraph, if: (i) Landlord ceases to furnish any Essential Services
(defined below) in the Building for a period in excess of five (5) consecutive business days after
Tenant provides written notice to Landlord outlining the exact nature of such interruption (the
“Interruption Notice”) ,such Interruption Notice shall not be required and shall be deemed given if
the property manager of the Building has actual knowledge of the exact nature of the applicable
Essential Services failure and such failure affects a portion of the Common Areas; (ii) such
interruption does not arise as a result of an act or omission of Tenant or Force Majeure; (iii)
such cessation is not caused by a casualty or condemnation as set forth in

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Sections 11 and 12
below, respectively; and (iv) as a result of such interruption, the Premises or a material portion
thereof, is rendered untenantable and Tenant in fact ceases to use the Premises, or material
portion thereof, then Tenant, as its sole remedy, shall be
entitled to receive an abatement of Rent payable hereunder during the period beginning on the sixth
(6th) consecutive business day following delivery of the Interruption Notice and ending on the day
when the service in question has been restored. Notwithstanding the foregoing, in the event that a
portion of the Premises is rendered untenantable but Tenant is not entitled to a rental abatement
under this paragraph (such as if the interruption was due to Tenant’s negligence), then Tenant
shall be entitled to the benefit of any rental interruption insurance proceeds carried by Landlord
applicable to the Premises. In the event the entire Premises has not been rendered untenantable
by the cessation in service, the amount of abatement that Tenant is entitled to receive shall be
prorated based upon the percentage of the Premises so rendered untenantable as a result of such
service interruption. “Essential Services” are limited to HVAC services, electrical services, a
minimum of one (1) passenger elevator, a minimum parking ratio of two (2) parking spaces per 1,000
rentable square feet of space within the Premises, or if parking spaces are unavailable within the
Garage, then such parking spaces may be provided within a three (3) mile radius of the Building, so
long as Landlord provides reasonable shuttle services, at Landlord’s sole cost and expense, and
water and plumbing services. The abatement afforded in this paragraph is superior to any other
provisions of this Lease. Notwithstanding the foregoing to the contrary, in the event of an
Essential Services failure affecting parking, Tenant shall be entitled to its proportionate share
(based on the number of square feet within the Building leased by Tenant) of available parking
spaces in the Garage.

Under all circumstances, Landlord shall use commercially reasonable efforts to remedy any
interruption of services as soon as possible following commencement thereof. Nothing contained in
this paragraph shall limit or impair Tenant’s abatement rights set forth in the preceding
grammatical paragraph.

          (3) Common Areas.

               (a) General Maintenance. Landlord shall be responsible for providing and/or
maintaining in good condition and repair the following: (i) trash removal; (ii) landscaping; (iii)
all labor costs and supply costs involved in the operation of the Building; (iv) all other services
of any kind and nature which Landlord determines may be used in or upon the Premises; (v)
management fees paid for the management of the Premises (not to exceed 3% of gross receipts from
the Building); (vi) and the repair, maintenance and replacement of the Building and improvements as
follows: (1) the roof; (2) all structural interior and exterior components of the Building and
improvements except those modifications installed by Tenant; (3) Garage; (4) sidewalks, alleys and
any and all access drives, including the removal of snow and ice therefrom; (5) heating and air
conditioning equipment, lines and fixtures except for any supplementary air conditioning systems
installed by or at the request of Tenant; (6) plumbing equipment, lines and fixtures, including,
but not limited to fire sprinkler and fire control systems, except for any of these items of
Tenant’s personal property including, without limitation, dishwashers and refrigerators; (7)
electrical equipment, lines and fixtures, except for Tenant’s personal property including, without
limitation, back-up generators and computer infrastructures; (8) all ingress-egress doors to the
Building; (9) exterior plate glass; (10) all utility lines and services, except to the extent
installed or modified by or at the direction of Tenant; (11) elevator equipment, lines and
fixtures; (12) preventative maintenance to the heating and air conditioning equipment, lines and
fixtures; and (13) janitorial service to the Premises and common areas. LANDLORD’S LIABILITY FOR
ANY DEFECTS, REPAIRS, REPLACEMENT OR MAINTENANCE FOR WHICH LANDLORD IS RESPONSIBLE UNDER THIS LEASE
SHALL BE LIMITED TO THE COST OF PERFORMING SUCH WORK.

Landlord and Tenant acknowledge that in accordance with the provisions of the Americans with
Disabilities Act (the “ADA”), responsibility for compliance with the terms and conditions of Title
III of the ADA may be allocated as between Landlord and Tenant. Notwithstanding anything to the
contrary contained in the Lease, Landlord and Tenant agree that the responsibility for compliance
with the ADA shall be allocated as follows: (i) Tenant shall be responsible for compliance with
the provisions of Title III of the ADA with respect to existing conditions within the Premises
(including, without limitation, the entry and doors thereto) during the Term (not including
compliance with the ADA of initial improvements constructed as Landlord’s work in the Premises) and
the construction by Tenant of alterations within the Premises; and (ii) Landlord shall be
responsible for compliance with the provisions of Title III of the ADA with respect to the exterior
of the Building, parking areas, sidewalks and walkways, and the areas appurtenant thereto, together
with all other common areas of the Building not included within the Premises. Landlord and Tenant
each agree to indemnify and hold each other harmless from and against any claims, damages, costs,
and liabilities arising out

6

 

of Landlord’s or Tenant’s failure, as the case may be, to comply with
Title III of the ADA as set forth above, which indemnification obligation shall survive the
expiration or termination of this Lease. Landlord and Tenant each agree that the allocation of
responsibility for ADA compliance shall not require Landlord or Tenant to supervise, monitor, or
otherwise review the compliance activities of the other with respect to its assumed
responsibilities for ADA compliance as set forth herein.

               (b) Property Management Office. A property management office for use by the property
management staff, engineers, and related Building-operations personnel shall be established within
the Building or the Complex. If the property management office is located within the Building,
then the property management office shall not exceed 2,000 rentable square feet of space, and such
area shall be taken into consideration when calculating the rentable square footage of the
Premises, which shall be adjusted in accordance with the Standard Method for Measuring Floor Area
in Office Buildings, ANSI/BOMA Z65.1-1996 (“1996 BOMA”). All reasonable costs of the management
office (including, without limitation, an allocation for rent for the area occupied by the
management office, utility charges, services to the management office, and parking rent and
operating expenses) shall be included as Operating Expenses. Notwithstanding the foregoing, if the
property management services both the Building and the adjacent building, 585 North Dairy Ashford,
then forty-eight percent (48%) of such costs of maintaining and operating the property management
office shall be allocated to the Building.

          (4) Insurance. Landlord shall be responsible for providing Property and Liability
Insurance for the Premises. Should Landlord choose to self-insure, the cost of maintaining such
self insurance shall be considered an expense of the property and be payable by Tenant as a portion
of Operating Expenses; provided, that in no event shall Tenant be responsible for payment of any
amount in excess of the premiums that would have otherwise been reimbursable by Tenant if Landlord
had purchased such insurance from an insurance company and not elected to self insure.

          (5) Exclusions from Operating Expenses. The following items will be excluded from any
payment of Operating Expenses:

               (a) costs of repairs, replacements or other work occasioned by casualties, or by the exercise
by governmental authorities of the right of eminent domain;

               (b) advertising and promotional expenses, leasing commissions, attorneys’ fees, costs,
disbursements and other expenses incurred by Landlord or its agents in connection with the
solicitation of, advertising for, general promotion of the Building, negotiating with or entering
into leases or other prospective tenancy arrangements for space in the Building (including, without
limitation, lease assumptions or payments made to satisfy lease obligations), or in connection with
negotiations or disputes with and/or enforcement of agreements with such prospective tenants,
tenants or other occupants of the Building, marketing or leasing consultants, property management,
purchasers (or prospective purchasers), ground lessors (or prospective ground lessors), mortgagees
(or prospective mortgagees) of the Building, including leasing commissions, and fees of attorneys
or of marketing or leasing consultants or brokers or in connection with negotiations or disputes
with consultants, management agents, purchasers or mortgagees;

               (c) tenant allowances, tenant concessions, work letters, and other costs or expenses
(including permit, license and inspection fees) incurred in completing, fixturing, furnishing,
renovating or otherwise improving, decorating or redecorating, or painting space for prospective
tenants, tenants or other occupants of the Building, or vacant, leaseable space in the Building,
including space planning/interior design fees for same;

               (d) depreciation or other “non-cash” expense items or amortization, except for amortization
charges as expressly provided for with regard to permitted capital expenditures;

               (e) Cost of new capital improvements (as opposed to capital repairs or replacements that are
capital in nature), except to the extent the same are either expected to reduce the normal
operating costs (including, without limitation, utility costs) of the Building, or for the purpose
of complying with any law, rule or order (or amendment thereto) not in effect as of the date of
this Lease, amortized using a commercially reasonable interest rate over the time period reasonably
estimated by Landlord to recover the costs thereof taking into consideration the

7

 

anticipated cost
savings, as determined by Landlord using its good faith, commercially reasonable judgment (the cost
of repairs and replacements that are capital in nature shall also be amortized using a commercially
reasonable interest rate over the useful economic life of such repairs or replacements as
determined by Landlord in its reasonable discretion);

               (f) costs in connection with services (including electricity), items or other benefits of a
type which are not standard for the Building and which are not available to Tenant without specific
charge therefor, but which are provided to another tenant or occupant of the Building, whether or
not such other tenant or occupant is specifically charged therefor by Landlord; notwithstanding the
foregoing, the parties acknowledge that all utility and janitorial costs relating to the deli and
the fitness center shall be included as Operating Expenses to the extent that such costs exceed any
profit realized by Landlord from the deli or fitness center;

               (g) services, items and benefits for which any other tenant or occupant of the Building is
obligated specifically to reimburse Landlord or any other tenant or occupant of the Building pays
third persons (including, without limitation, separately metered utilities);

               (h) costs or expenses (including fines, penalties, interest and legal fees) incurred due to
the negligence of, or violation by, Landlord, its employees, agents and/or contractors, any tenant
or other occupant of the Building, of any terms and conditions of the Lease or of the leases of
other tenants in the Building, and/or of any applicable laws, rules, regulations and codes of any
federal, state, county, municipal or other governmental authority having jurisdiction over the
Building that would not have been incurred but for such negligence or violation by Landlord, its
employees, agents and/or contractors, tenants or other occupants of the Building, it being intended
that each party shall be responsible for the costs resulting from its own negligence or violation
of such leases and laws, rules, regulations and codes as same shall pertain to the Building;

               (i) penalties, fines, legal fees, or costs of litigation for late payment, including, without
limitation, interest and penalties for late payment of taxes, equipment leases, and other amounts
owing by Landlord (as long as Tenant pays amounts owing to Landlord hereunder on a timely basis);

               (j) payments to any Affiliate of Landlord for services (other than the Management Fee),
including overhead and profit increments, on or to the Building and/or the Land, or for goods,
supplies or other materials, to the extent that the costs of such services, goods, supplies and/or
materials exceed the competitive costs that would have been paid had the services, goods, supplies
or materials been provided by parties unaffiliated with Landlord (“Affiliate” means any person or
entity which wholly owns or is wholly owned by, or is under common ownership in the entirety with
the party in question);

               (k) payments of principal, finance charges or interest on debt or amortization on any
mortgage, deed of trust or other debt, or rental payments (or increases in same) under any ground
or underlying lease or leases;

               (l) compensation paid to clerks, attendants or other persons in commercial concessions (such
as a snack bar, deli, restaurant or newsstand) unless those services are provided for and approved
by Tenant;

               (m) except for emergencies, rentals and other related expenses temporary in nature (so long as
Landlord is diligently proceeding with the necessary repairs), if any, incurred in leasing air
conditioning systems, elevators or other major building equipment ordinarily considered to be of a
capital nature, except equipment the costs of which would have been included in Operating Expenses
had Landlord purchased such equipment, but not any amounts in excess of the Operating Expenses that
Landlord would have incurred had Landlord purchased such equipment;

               (n) costs for which Landlord is compensated through or reimbursed by insurance, warranties, or
other means of recovery;

               (o) costs of the initial construction of the Building and of correcting or repairing defects,
including latent defects, in the construction of the Building, the Complex and/or the Garage,
and/or equipment,

8

 

or the replacement of defective equipment; provided that costs of repair for
ordinary wear and tear shall be included in Operating Expenses;

               (p) contributions to operating expense reserves, tenant improvement reserves, commission
reserves, or capital improvement reserves;

               (q) initial costs of installing exterior landscaping;

               (r) contributions to political and charitable organizations;

               (s) the costs of any initial “tap fees” or one time lump sum sewer or water connection fees
for the Building;

               (t) costs or fees relating to the defense of Landlord’s title to or interest in the Building
and/or the Land, or any part thereof, or any costs or expenses associated with any sale, finance,
refinance, mortgage, transfer of ownership of the Building, including brokerage commissions,
attorneys’ and accountant fees, closing costs, title insurance premiums, transfer taxes and
interest charges transactions;

               (u) except as otherwise provided herein, Landlord’s general corporate overhead costs
(including salaries, equipment, supplies, accounting and legal fees, rent and other occupancy
costs) and other costs relating to the operation and internal organization and function of Landlord
as a business entity (as opposed to the maintenance or operation of the Building;

               (v) costs of acquiring, insuring (to the extent only that such items must be separately
scheduled), or maintaining (including any special cleaning or security, but only to the extent such
maintenance or security is in excess of Building Standard Services) art work located in the
Building (whether permanently or temporarily);

               (w) costs incurred by Landlord to monitor, encapsulate or remove any asbestos, polychlorinated
biphenyls or other Hazardous Materials;

               (x) increased insurance premiums caused by Landlord’s or any tenant’s hazardous acts; and

               (y) costs resulting from the negligence or intentional tort of or violation of any law by
Landlord, or any Affiliate of Landlord, or any representative, employee or agent of same.

     (B) Payment. Tenant shall pay its Proportionate Share of the cost of all Operating
Expenses, payable in advance in monthly installments as reasonably estimated by Landlord from
time-to-time (but not re-estimated on more than one (1) occasion during any calendar quarter).
Within sixty (60) days after the first day of each calendar year, Landlord shall furnish to Tenant
an estimate of Tenant’s Proportionate Share of reimbursable Operating Expenses for the ensuing
calendar year. Landlord will furnish a statement of the actual cost with respect to the
reimbursable Operating Expenses (“Final Statement”) no later than one hundred twenty (120) days
following the calendar year-end including the year following the year in which this Lease
terminates. In the event that Landlord is, for any reason, unable to furnish the accounting for the
prior year within the time specified above, Landlord will furnish such accounting as soon
thereafter as practicable with the same force and effect as the statement would have had if
delivered within the time specified above. Tenant will pay any deficiency to Landlord as shown by
such statement within thirty (30) days after receipt of statement. If the total amount paid by
Tenant during any calendar year exceeds the actual amount of its share of the reimbursable
Operating Expenses due for such calendar year, the excess will be refunded by Landlord within
thirty (30) days of the date of the statement.

     (C) Gross Up. With respect to any calendar year or partial calendar year during the
term of this lease in which the Building is not ninety-five percent (95%) occupied, the Operating
Expenses for such period shall, for the purposes hereof, be increased to the amount which would
have been incurred had the Building been ninety-five percent (95%) occupied.

9

 

     (D) Review of Books and Records. Tenant shall have the right to conduct a Tenant’s
Review, as hereinafter defined, at Tenant’s sole cost and expense (including, without limitation,
photocopy and delivery
charges), upon thirty (30) days’ prior written notice to Landlord. “Tenant’s Review” shall mean a
review of Landlord’s books and records relating to (and only relating to) Operating Expenses
payable by Tenant hereunder for the most recently completed calendar year (as reflected on
Landlord’s Final Statement) by Tenant’s employees or a Certified Public Accountant (“CPA”) selected
by Tenant. Tenant must elect to perform a Tenant’s Review by written notice of such election
received by Landlord within ninety (90) days following Tenant’s receipt of Landlord’s Final
Statement for the most recently completed calendar year. In the event that Tenant fails to make
such election in the required time and manner required or fails to diligently perform such Tenant’s
Review to completion, then Landlord’s calculation of Operating Expenses and Taxes shall be final
and binding on Tenant. Tenant hereby acknowledges and agrees that even if it has elected to
conduct a Tenant’s Review, Tenant shall nonetheless pay all Operating Expense payments to Landlord,
subject to readjustment. Tenant further acknowledges that Landlord’s books and records relating to
the Building may not be copied in any manner, are confidential, and may only be reviewed at a
location reasonably designated by Landlord; but Landlord will make such records available within
the metropolitan area in which the Premises is located. Tenant shall provide to Landlord a copy of
Tenant’s Review as soon as reasonably possible after the date of such Review. If Tenant’s Review
reflects a reimbursement owing to Tenant by Landlord, and if Landlord disagrees with Tenant’s
Review, then Tenant and Landlord shall jointly appoint an auditor to conduct a review (“Independent
Review”), which Independent Review shall be deemed binding and conclusive on both Landlord and
Tenant. The Independent Review must be performed by a Certified Public Accountant with a minimum
of ten (10) years of experience performing operating expense audits in connection with office
leases of over 20,000 rentable square feet and may not be an Affiliate of Landlord, Tenant or the
property management company then performing services for the Building. If the Independent Review
results in a reimbursement owing to Tenant equal to five percent (5%) or more of the amounts
reflected in the Final Statement, the costs of Tenant’s Review and the Independent Review shall be
paid by Landlord within thirty (30) days following Landlord’s receipt of an itemized invoice from
Tenant third party auditor, but otherwise Tenant shall pay the costs of Tenant’s Review and the
Independent Review. Under no circumstances shall Tenant conduct a review of Landlord’s books and
records whereby the auditor operates on a contingency fee or similar payment arrangement. Any such
reviewer must sign a commercially reasonable non-disclosure, non-solicitation, and confidentiality
agreement.

6. COMPLIANCE. Tenant, at Tenant’s sole expense, shall comply with all laws, rules, orders,
ordinances, directions, regulations and requirements of federal, state, county, and municipal
authorities now in force or which may hereafter be in force, which shall impose any duty upon
Landlord or Tenant with respect to the use, occupation or alteration of the Premises.
Notwithstanding anything to the contrary contained herein, Tenant will keep, maintain and preserve
the Premises in good condition, except for normal wear and tear, damage by fire or casualty and
repairs or services required to be completed or provided by Landlord hereunder. When and if
needed, at Tenant’s sole cost and expense, Landlord will make all interior repairs and replacements
including but not limited to interior walls, doors and windows, floors, floor coverings, light
bulbs, plumbing fixtures, and electrical fixtures, except for normal wear and tear, damage by fire
or casualty and repairs or services required to be completed or provided by Landlord hereunder.
Tenant will also reimburse to Landlord, at Tenant’s sole cost and expense, costs to repair or
replace any broken windows and/or damage to the Building or Premises caused by the negligence of
Tenant or its employees, agents, guests or invitees during the Lease Term hereof. The above
repairs, replacements, and/or services must be performed by an approved contractor of Landlord,
which approval shall not be unreasonably withheld, conditioned or delayed. Should Tenant fail to
perform all interior repairs and replacements to Tenant’s Premises such repairs may be performed by
Landlord and charged to Tenant at Tenant’s sole cost and expense. Tenant will comply with all
ordinances of the City of Houston, rules and regulations of the Board of Health and the laws of the
State of Texas, and any laws, rules or regulations of any governmental authority required of either
Landlord or Tenant relative to the repair, maintenance and replacement in the Premises. Tenant
agrees to comply with all rules and regulations promulgated by Landlord from time to time of which
Tenant has prior written notice (“Rules and Regulations”). Current Rules and Regulations are as
set forth on Exhibit B. The terms of this Lease shall control over any conflict with the
Building Rules and Regulations. Landlord cannot make changes to the Rules and Regulations attached
as Exhibit B to this Lease to the extent such new regulations would impose additional and material
economic obligations on Tenant. All Rules and Regulations shall be uniformly applied and enforced
by Landlord. Any changes to the Rules and Regulations shall not be binding on Tenant until Tenant
has received written notice of such changes.

10

 

Tenant acknowledges that it is in receipt of that certain Access Easement Agreement dated May 2,
2007, the Declaration of Protective Covenants and Restrictions for Woodcreek Park dated September
22, 1978, the Designation dated April
23, 1998, the First Amendment to Declaration executed on April 20, 1998, and the Restrictions
Related to the Use and Occupancy of the Property dated April 23, 1998 (collectively, the
“Protective Covenants”). Tenant shall also comply with all easements, covenants and restrictions
now or hereafter affecting the property on which the Building is located, including, without
limitation, the Protective Covenants. Additionally, Tenant acknowledges that Landlord may enter
into reciprocal easement agreements, operating agreements or additional covenants with adjacent
property owners, and Tenant hereby agrees to cooperate with Landlord’s endeavors in entering into
any such easements, agreements or covenants, and shall abide by such easements, agreements and
covenants.

7. PARKING. Tenant and its employees, agents and invitees shall have the non-exclusive right to
use the Parking Spaces, subject to (i) such reasonable Rules and Regulations (as defined herein) as
Landlord may promulgate from time to time and applicable laws, as well as (ii) the rights of
ingress and egress of other tenants, property management and their employees, agents and invitees
(including, without limitation, tenants of the building located at 585 North Dairy Ashford,
Houston, Texas and their agents, representatives and invitees), and to the extent applicable.
Landlord may grant or deny access rights to the areas that physically connect the garages of 575
North Dairy Ashford and 585 North Dairy Ashford buildings from time to time upon thirty (30) days’
advance written notice; provided that reasonable means of ingress and egress from the garage for
the Building remains. Tenant shall only permit parking by its employees, agents or invitees of
appropriate vehicles in appropriate designated parking areas. Landlord shall not be responsible
for enforcing Tenant’s parking rights against any third parties. It is understood and agreed that
no specific, reserved parking spaces, will be allocated for use by Tenant. Each user will have the
right to park in any available parking space in accordance with regulations of uniform
applicability promulgated by the operator and Landlord. Notwithstanding anything herein to the
contrary, Landlord and the operator hereby reserve the right from time to time to designate any
portion of the parking facilities to be used exclusively by visitors to the Building, other
persons, entities, or tenants, and to charge for visitor parking. Tenant agrees that it and its
employees shall observe the safety precautions in the use of parking facilities and shall at all
times abide by all reasonable rules and regulations promulgated by the operator and Landlord
governing their use. In the event that the operator and/or Landlord require that an identification
or parking sticker must be displayed at all times in all cars parked in the parking facilities, any
car not displaying such a sticker may be towed away at the car owner’s expense.

8. HAZARDOUS SUBSTANCE. The term “Hazardous Substances”, as used in this Lease shall mean
pollutants, contaminants, toxic or hazardous wastes, or any other substances, the use and/or the
removal of which is required or the use of which is restricted, prohibited or penalized by any
“Environmental Law”, which term shall mean any federal, state or local law, ordinance or other
statute of a governmental or quasi-governmental authority relating to pollution or protection of
the environment. Tenant hereby agrees that (A) no activity will be conducted on the Premises by
Tenant or any of its employees, contractors, agents or invitees that will produce any Hazardous
Substance, except for such activities that are part of the ordinary course of Tenant’s business
activities or that are part of Tenant’s rights or obligations under this Lease, including, but not
limited to construction activities (the “Permitted Activities”) provided the Permitted Activities
are conducted in accordance with all Environmental Laws and have been approved in advance in
writing by Landlord; Tenant shall be responsible for obtaining any required permits and paying any
fees and providing any testing required by any governmental agency; (B) the Premises will not be
used in any manner for the storage of any Hazardous Substances except for the temporary storage of
such materials that are used in the ordinary course of Tenant’s business, that are used as normal
office and cleaning supplies, or that are used as normal construction, renovation, or repair
supplies (the “Permitted Materials”) provided such Permitted Materials are properly stored in a
manner and location meeting all Environmental Laws and approved in advance in writing by Landlord;
Tenant shall be responsible for obtaining any required permits and paying any fees and providing
any testing required by any governmental agency relating to the Premises; (C) no portion of the
Premises will be used as a landfill or a dump; (D) Tenant will not install any underground tanks of
any type; (E) Tenant will not cause any surface or subsurface conditions to exist or come into
existence that constitute, or with the passage of time may constitute a public or private nuisance;
(F) Tenant will not cause any Hazardous Substances to be brought onto the Premises, except for the
Permitted Materials described above, and if so brought thereon by Tenant or any of its employees,
contractors, agents or invitees, the same shall be immediately removed, with proper disposal, and
all required cleanup procedures shall be diligently undertaken pursuant to all Environmental Laws.
Landlord or Landlord’s representative shall have the right

11

 

but not the obligation to enter the
Premises for the purpose of inspecting the storage, use and disposal of Permitted Materials to
ensure compliance with all Environmental Laws. Should it be determined, in Landlord’s reasonable
opinion, that the Permitted Materials are being improperly stored, used, or disposed of, then
Tenant shall immediately take such
corrective action as reasonably requested by Landlord. Should Tenant fail to commence such
corrective action within 24 hours, Landlord shall have the right to perform such work and Tenant
shall promptly reimburse Landlord for any and all costs associated with such work. If at any time
during or after the Lease Term, the Premises are found to be so contaminated or subject to such
conditions and any such contamination or conditions were caused by Tenant or any of its employees,
contractors, agents or invitees, Tenant shall diligently institute proper and thorough cleanup
procedures at Tenant’s sole cost, and TENANT AGREES TO INDEMNIFY, DEFEND AND HOLD HARMLESS
LANDLORD, ITS LENDERS, ANY MANAGING AGENTS AND LEASING AGENTS OF THE PREMISES, AND THEIR RESPECTIVE
AGENTS, PARTNERS, OFFICERS, DIRECTORS AND EMPLOYEES, FROM ALL CLAIMS, DEMANDS, ACTIONS,
LIABILITIES, COSTS, EXPENSES, DAMAGES AND OBLIGATIONS OF ANY NATURE ARISING FROM OR AS A RESULT OF
ANY SUCH CONTAMINATION OR HAZARDOUS MATERIALS CAUSED BY TENANT OR ANY OF ITS EMPLOYEES,
CONTRACTORS, AGENTS OR INVITEES. THE FOREGOING INDEMNIFICATIONS SHALL SURVIVE THE EXPIRATION OR
SOONER TERMINATION OF THIS LEASE.

During the Lease Term, Tenant shall promptly provide Landlord with copies of all summons,
citations, directives, information inquiries or requests, notices of potential responsibility,
notices of violation or deficiency, orders or decrees, claims, complaints, investigations,
judgments, letters, notice of environmental liens, and other communications, written or oral,
actual or threatened, from the United States Environmental Protection Agency, Occupational Safety
and Health Administration, the Texas Commission on Environmental Quality or other federal, state or
local agency or authority, or any other entity or individual, concerning (i) any Hazardous
Substance and the Premises; (ii) the imposition of any environmental lien on the Premises; or (iii)
any alleged violation of or responsibility under any Environmental Law related to the Premises.
Tenant shall also provide Landlord the opportunity to review and approve all work plans for
subsurface investigation or site remediation in advance of their submittal to any regulatory
agency, to review and comment on all draft reports in advance of their submittal to any regulatory
agency, and to participate in any meetings or conference calls held with any regulatory agency to
discuss investigation or remediation of the property relating to the Premises.

     Subject to applicable limitations on Landlord’s liability and waivers of subrogation, Landlord
will indemnify, defend and hold Tenant harmless from and against any claim, cost, damage, expense
(including without limitation reasonable attorneys’ fees and costs of defense but excluding
indirect or consequential damages), loss, liability, or judgment now or hereafter arising as a
result of any claim associated with any required clean-up or other actions arising from the
existence, release or threatened release of Hazardous Material on, in or under the Premises, to the
extent not otherwise caused or aggravated by the act or neglect of Tenant or Tenant’s agents,
employees or contractors, that is either (i) released by Landlord or its agents, employees or
contractors, or (ii) accruing prior to the Commencement Date. Operating Expenses shall not
include any remediation costs.

     The terms and conditions of this Section 8 shall survive the expiration or sooner termination
of this Lease.

9. INSURANCE.

     (A) INSURANCE BY LANDLORD. Landlord shall, during the Lease Term, procure and keep in force
at least the following insurance (the cost of Landlord’s insurance hereunder will be deemed to be
an Operating Expense to the extent applicable to the period after the Commencement Date):

          (1) PROPERTY INSURANCE. “All Risk” property insurance covering the full replacement
value of the Building and including, without limitation, coverage for earthquake and flood; and
machinery (if applicable); sprinkler damage; vandalism; malicious mischief. Such Insurance shall
not cover Tenant’s equipment, trade fixtures, inventory, fixtures or personal property located on
or in the Premises.

          (2) LIABILITY INSURANCE. Commercial general liability (lessor’s risk) insurance against any
and all claims for bodily injury, death or property damage occurring in or about the Building or
the Land. Such insurance shall have a combined single limits as may be reasonably determined by
Landlord from time to time; and

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          (3) OTHER. Such other insurance as Landlord deems necessary and prudent.

     (B) INSURANCE BY TENANT. Tenant shall, during the Lease Term, procure and keep in force the
following insurance:

          (1) Tenant’s Liability Insurance. Tenant shall procure and maintain at its own cost
an occurrence form commercial general liability policy insuring against any and all claims for
bodily injury and property damage occurring in, or about the Premises arising out of Tenant’s use
and occupancy of the Premises with a combined single limit of $1,000,000 per occurrence with a
$2,000,000 aggregate limit and excess umbrella liability insurance in the amount of $5,000,000
insuring Landlord, Landlord’s Related Parties and Tenant from claims, demands or actions for injury
to or death of any person or persons and for damage to property made by, or on behalf of, any
person or persons, firm or corporation, to the extent Tenant is legally liable, arising from,
related to, or connected with the Premises. The insurance shall name Landlord and Landlord’s
management agent (and, if requested by Landlord or any mortgagee, include any mortgagee) and their
respective agents and employees as additional insureds, provided that Landlord shall in no event be
entitled to insurance benefits from Tenant’s carriers in excess of the requirements set forth in
this Section 9. Such liability insurance shall be primary and not contributing to any insurance
available to Landlord, and Landlord’s insurance shall be in excess thereto. In no event shall the
limits of such insurance be considered as limiting the liability of Tenant under this lease.

          (2) Tenant’s Property. Personal property insuring all equipment, trade fixtures,
inventory, fixtures, and personal property located on or in the Premises for perils covered by the
causes of loss — special form (all risk) and in addition, coverage for flood, wind, earthquake,
terrorism and boiler and machinery (if applicable). Such insurance shall be written on a
replacement cost basis in an amount equal to one hundred percent (100%) of the full replacement
value of the aggregate of the foregoing.

          (3) Workers’ Compensation/Employers Liability Insurance. Tenant shall carry Workers’
Compensation insurance in accordance with statutory law and Employers’ Liability insurance with a
limit of not less than $1,000,000 per accident, $1,000,000 disease, policy limit and $1,000,000
disease limit each employee.

          (4) Increase in Coverage. Following the initial five (5) years of the term of this
Lease, if Landlord deems necessary and prudent or required by Landlord’s beneficiaries or
mortgagees of any deed of trust or mortgage encumbering the Premises, then Landlord may by notice
to Tenant require an increase in coverage if, the insurance specified in this Section 9 is no
longer considered adequate to maintain a reasonable level of insurance protection and such
increased limits are consistent with the limits required by the owners of Comparable Buildings,
provided the increase shall be no more than twenty percent (20%) of the insurance limits in effect
at the time. “Comparable Buildings” are hereby defined to be Class A office buildings within the
Energy Corridor submarket that are similar to the Building. Landlord may not increase the
insurance requirements unless such new requirements are applicable to tenants representing a
minimum of seventy-five percent of the leaseable area of the Building.

          (5) Waiver of Subrogation. Landlord and Tenant hereby mutually waive their respective
rights of recovery against each other for any loss of, or damage to, either parties’ property, to
the extent that such loss or damage is insured by an insurance policy (or in the event Tenant
elects to self insure any property coverage required) required to be in effect at the time of such
loss or damage. Each party shall obtain any special endorsements, if required by its insurer,
whereby the insurer waives its rights of subrogation against the other party. The provisions of
this clause shall not apply in those instances in which waiver of subrogation would cause either
party’s insurance coverage to be voided or otherwise made uncollectible.

          (6) General Requirements. All insurance policies shall be in forms reasonably
satisfactory to Landlord. The policies required to be maintained by Tenant shall be with companies
rated A- X or better in the most current issue of A.M. Best’s Insurance Ratings Guide. Insurers
shall be licensed to do business in the state in which the Premises are located and domiciled in
the USA. In no event shall the limits of such insurance be considered as limiting the liability of
Tenant under this Lease. Certificates of insurance shall be delivered to Landlord prior to the
Commencement Date and annually thereafter no later than ten (10) days following the policy

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expiration date. Tenant shall have the right to provide insurance coverage which it is obligated
to carry pursuant to the terms hereof in a blanket policy, provided such blanket property policy
expressly affords coverage to the Premises, and Tenant’s property and liability policies expressly
afford coverage to Landlord as required by this Lease.

          (7) Cancellation or Modification. Insurance policies shall provide at least thirty
(30) days’ prior written notice of cancellation (unless such cancellation is due to non-payment of
premiums, in which event ten (10) days’ prior written notice shall be required). If Tenant
receives notice of cancellation or material modification, Tenant shall notify Landlord and
Landlord’s management agent in writing within five (5) business days of receiving a notice of
cancellation or if a policy is materially and adversely changed with respect to the requirements of
this Lease.

          (8) Miscellaneous. If Tenant fails to maintain and secure the insurance coverage
required under this Section 9, then Landlord shall have, in addition to all other remedies provided
herein and by law, the right, but not the obligation, to procure and maintain such insurance, the
cost of which shall be due and payable to Landlord by Tenant within ten (10) business days after
written demand therefor. Tenant shall not conduct or permit to be conducted by its employees,
agents, contractors, guests or invitees any activity, or place any equipment in or about the
Premises or the Building, that will in any way increase the cost of fire insurance or other
insurance on the Building. If any increase in the cost of fire insurance or other insurance is
stated by any insurance company or by the applicable Insurance Rating Bureau, if any, to be due to
any activity or equipment of Tenant in or about the Premises or the Building, such statement shall
be conclusive evidence that the increase in such cost is due to such activity or equipment and, as
a result thereof, Tenant shall be liable for the amount of such increase. Tenant shall reimburse
Landlord for such amount upon written demand from Landlord and any such sum shall be considered
additional Rent payable hereunder. Tenant, at its sole expense, shall comply with any and all
requirements of any insurance organization or company necessary for the maintenance of reasonable
fire and public liability insurance covering the Premises and the Building. Landlord currently
does not require that Tenant carries business interruption insurance; however, Landlord recommends
that Tenant carries a commercially reasonable policy of business interruption insurance.

10. INDEMNIFICATION.

     (A) Release. Except to the extent caused by the negligence or willful misconduct of,
or violation of law by, or due to the default under this Lease beyond any applicable notice and
cure period by, Landlord or its agents, employees or contractors, but subject to the provisions set
forth in Section 9(B)(5) above, Tenant hereby releases Landlord, its beneficiaries, mortgagees,
stockholders, agents (including, without limitation, management agents), partners, officers,
servants and employees, and their respective agents, partners, officers, servants and employees
(“Related Parties”), from and waives all claims for damages to person or property sustained by
Tenant, resulting directly or indirectly from fire or other casualty, any existing or future
condition, defect, matter or thing in the Premises, the Building (including the associated common
areas), or from any equipment or appurtenance therein, or from any accident in or about the
Building (including the associated common areas), or from any act of neglect of any third party
tenant or occupant of the Building or of any other third party.

     (B) Tenant’s Indemnification. Except to the extent caused by the negligence or
willful misconduct of or due to the default under this Lease beyond any applicable notice and cure
period, by Landlord or its agents, employees or contractors, but subject to the provisions set
forth in Section 9(B)(5) above, Tenant agrees to hold harmless and indemnify Landlord and
Landlord’s Related Parties from and against claims and liabilities, including reasonable attorneys’
fees, (i) for injuries to all persons and damage to or theft or misappropriation or loss of
property (excluding the Building or any equipment or appurtenance therein belonging to Landlord)
occurring in the Premises arising from Tenant’s occupancy of the Premises or the conduct of its
business, or from any activity, work, or thing done, permitted or suffered by Tenant, its
employees, agents, guests or invitees in the Premises, (ii) the negligence of Tenant or its agents,
employees or contractors, or (iii) from any breach or default on the part of Tenant in the
performance of any covenant or agreement on the part of Tenant to be performed pursuant to the
terms of this Lease beyond the expiration of applicable notice or cure periods.

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     (C) Tenant’s Fault. Subject to the provisions set forth in Section 9(B)(5) above, if
any damage to the Building or any equipment or appurtenance therein belonging to Landlord, results
from any negligent act or the willful misconduct of Tenant, its agents or employees, Tenant shall
be liable therefor and Landlord may, at Landlord’s option repair such damage, and Tenant shall,
upon demand by Landlord, reimburse Landlord the total reasonable cost of such repairs and damages
to the Building. If Landlord has failed to procure and maintain the
insurance required under Section 9(A), any damage to the Building or any equipment or appurtenance
therein belonging to Landlord shall be solely to Landlord’s account.

     (D) Landlord’s Indemnification. Subject to the provisions set forth in Section
9(B)(5) above, and to the extent not due to the negligence or willful misconduct of Tenant or its
agents, employees or contractors, Landlord agrees to indemnify, defend and hold Tenant and its
officers, directors, partners, employees, agents and contractors harmless from and against all
liabilities, losses, demands, actions, expenses or claims, including attorneys’ fees and court
costs for injury to or death of any person or for damage to any property to the extent such are
determined to be caused by (i) the negligence or willful misconduct of Landlord, its agents,
employees, or contractors in or about the Premises or Building, or (ii) the breach by Landlord of
this Lease beyond any applicable notice and cure period.

     (E) Limitation on Landlord’s Liability. Tenant agrees that in the event Tenant shall
have any claim against Landlord or Landlord’s Related Parties under this Lease arising out of the
subject matter of this Lease, Tenant’s sole recourse shall be against Landlord’s interest in the
Building, for the satisfaction of any claim, judgment or decree requiring the payment of money by
Landlord or Landlord’s Related Parties as a result of a breach hereof or otherwise in connection
with this Lease, and no other property or assets of Landlord, Landlord’s Related Parties or their
successors or assigns, shall be subject to the levy, execution or other enforcement procedure for
the satisfaction of any such claim, judgment, injunction or decree.

     (F) No Consequential Damages. Under no circumstance shall either Tenant or Landlord
or any of their Related Parties be liable for consequential, special, punitive, exemplary or any
similar type of damages, and the parties hereby waives the same, except for consequential damages
relating to an unauthorized holding over by Tenant for more than thirty (30) days following
delivery by Landlord of a written notice to vacate.

11. DAMAGE OR CASUALTY.

     (A) Minor Insured Damage. In the event the Premises or the Building, or any portion
thereof, is damaged or destroyed by any casualty, then Landlord shall rebuild, repair and restore
the damaged portion thereof, provided that Landlord shall be entitled to terminate this Lease by
written notice to Tenant within sixty (60) days after the date of the casualty if any one of the
following applies: (i) the amount of insurance proceeds available to Landlord and the amount of the
insurance deductible is less than the cost of such rebuilding, restoration and repair, (ii) such
rebuilding, restoration and repair cannot reasonably be completed within one hundred eighty (180)
days after the date of casualty in the opinion of an independent registered architect or engineer
appointed by Landlord, (iii) the damage or destruction has occurred within twelve (12) months
before the expiration of the Lease Term and Tenant has not elected, nor does not elect to exercise,
any then applicable renewal option within thirty (30) days after Tenant’s receipt of Landlord’s
termination notice, or (iv) such rebuilding, restoration, or repair is not then permitted, under
applicable governmental laws, rules and regulations, to be done in such a manner as to return the
damaged portion thereof to substantially its condition immediately prior to the damage or
destruction, including, without limitation, the same net rentable floor area. To the extent that
insurance proceeds must be paid to a mortgagee or beneficiary under, or must be applied to reduce
any indebtedness secured by, a mortgage or deed of trust encumbering the Premises or the Building,
such proceeds, for the purposes of this subsection, shall be deemed not available to Landlord
unless such mortgagee or beneficiary permits Landlord to use such proceeds for the rebuilding,
restoration, and repair of the damaged portion thereof. Notwithstanding the foregoing, Landlord
shall have no obligation to repair any damage to, or to replace any of, Tenant’s personal property,
furnishings, trade fixtures, equipment or other such property or effects of Tenant. If Landlord
does not timely deliver such termination notice to Tenant, Landlord shall not thereafter be
entitled to terminate this Lease pursuant to this Section 11(A) and shall be obligated to restore
the damage to the Building and the Premises.

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     (B) Major or Uninsured Damage. In the event the Premises or the Building, or any
portion thereof (and if the Garage is damaged, such that more than thirty-five percent (35%) of the
Parking Spaces available for Tenant’s use are rendered unusable), is damaged or destroyed by any
casualty to the extent that Landlord is not obligated, under Section 11(A) above, to rebuild,
repair or restore the damaged portion thereof, then Landlord shall, within sixty (60) days after
such damage or destruction, notify Tenant of its election, at its option, to either (i) rebuild,
restore and repair the damaged portions thereof, in which case Landlord’s notice shall specify the
time period within which Landlord estimates such repairs or restoration can be completed
(“Restoration Notice”); or (ii)
terminate this Lease effective as of the date the damage or destruction occurred. If Landlord does
not give Tenant written notice within sixty (60) days after the damage or destruction occurs of its
election to terminate this Lease, Tenant may thereafter deliver to Landlord a written demand for
Landlord to determine whether Landlord will terminate this Lease or restore the damage, and if
Landlord fails to respond to such demand within ten (10) business days following receipt, then (x)
Landlord shall not thereafter be entitled to terminate this Lease pursuant to Section 11(A) and
shall be obligated to restore the damage to the Building and the Premises, and (y) Tenant may elect
to terminate the Lease by written notice delivered to Landlord within thirty (30) days following
the expiration of said ten (10) business day period. Notwithstanding the foregoing, if Landlord
does not elect to terminate this Lease, Tenant may terminate this Lease if either (i) Landlord
notifies Tenant that such repair or restoration cannot be completed within two hundred twenty-five
(225) days (subject to delays for shortage of materials or labor) after the date of the casualty,
or (ii) the damage or destruction occurs within the last twelve (12) months of the Lease Term,
unless Tenant’s negligence or willful misconduct was the cause of the damage. If Tenant has the
right to terminate the Lease in accordance with the above provisions, Tenant may so elect by
written notice to Landlord, which must be given within thirty (30) days after the date Landlord
delivers its initial notice of the estimate of the duration of the repairs, or ninety (90) days
following the date of the casualty, whichever shall first occur. Upon Landlord’s receipt of such
notice, the termination shall be effective as of the date the destruction occurred and Tenant shall
have a reasonable period thereafter to move out of the Premises. If Tenant and Landlord have not
terminated this Lease as allowed by the previous subsections of this Section 11 and Landlord does
not complete such restoration and access thereto within the later of two hundred twenty-five (225)
days after the date of the casualty or the estimated date of completion set forth in the
Restoration Notice, then Tenant may thereafter elect to terminate this Lease by thirty (30) days’
prior written notice to Landlord; provided that such termination shall not be effective if Landlord
substantially completes the restoration prior to the expiration of said thirty (30) day period
[after the lapse of the above-referenced time period]. Thirty (30) days following Landlord’s
receipt of such notice without such substantial completion, the termination shall be effective as
of the date the destruction occurred and Tenant shall have a reasonable period thereafter to move
out of the Premises.

     (C) Abatement of Rent. There shall be an abatement of rent by reason of damage to or
destruction of the Premises or the Building, or any portion thereof, to the extent that a portion
of the Premises cannot be reasonably used (and is not used) by Tenant for conduct of its business,
in which event the Base Rent shall abate proportionately commencing on the date that the damage to
or destruction of the applicable portion of the Premises or the Building has occurred, and except
that, if Landlord or Tenant elects to terminate this Lease as provided in Paragraph 11(B) above, no
obligation shall accrue under this Lease after such termination. Notwithstanding the provisions of
this Section 11(C), if Landlord’s insurance refuses to pay for a portion of abatement or Landlord
lacks coverage and the cause of the damage was due to the negligence or willful misconduct of
Tenant or its employees, agents or contractors, Tenant shall not be entitled to such abatement.

     (D) Termination. Tenant’s right to terminate this Lease in the event of any damage or
destruction to the Premises or the Building, is governed by the terms of this Section 11 and
therefore Tenant hereby expressly waives the provisions of any and all laws, whether now or
hereafter in force, and whether created by ordinance, statute, judicial decision, administrative
rules or regulations, or otherwise, that would cause this Lease to be terminated, or give Tenant a
right to terminate this Lease, upon any damage to or destruction of the Premises or the Building
that occurs.

     (E) Parking. If the Garage is damaged in such a manner so that the number of Parking
Spaces that are available to Tenant falls below the parking ratio required under Section 1.18 above
(based on the number of rentable square feet of space then occupied by Tenant, if less than the
entire Premises), then such Parking Spaces may be provided within a three (3) mile radius of the
Building, so long as Landlord provides reasonable shuttle services, at Landlord’s sole cost and
expense. Notwithstanding the foregoing to the contrary, in the event of a

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casualty affecting
parking, Tenant shall be entitled to its proportionate share (based on the number of square feet
within the Building leased by Tenant) of available parking spaces in the Garage.

12. EMINENT DOMAIN. In the event that the whole or a substantial part of the Premises shall be
condemned or taken in any manner for any public or quasi-public use (or sold under threat of such
taking), and as a result thereof, the remainder of the Premises cannot be used for the same purpose
as prior to such taking, the Lease shall terminate as of the date possession is taken. If less than
a substantial
part of the Premises shall be so condemned or taken (or sold under threat thereof) and after such
taking the Premises can be used for the same purposes as prior thereto, the Lease shall cease only
as to the part so taken as of the date possession shall be taken by such authority, and Tenant
shall pay full Rent up to that date (with appropriate refund by Landlord of such Rent attributable
to the part so taken as may have been paid in advance for any period subsequent to the date
possession is taken) and thereafter Base Rent and Operating Expenses shall be equitably adjusted to
reflect the reduction in the Premises by reason of such taking, Landlord shall, at its expense,
make all necessary repairs or alterations to the Building so as to constitute the remaining
Premises a complete architectural unit, provided that Landlord shall not be obligated to undertake
any such repairs or alterations if the cost thereof exceeds the award resulting from such taking.
Landlord shall be entitled to receive the entire award, including the damages for the property
taken and damages to the remainder, with respect to any condemnation proceedings affecting the
Building; however, Tenant may make a separate claim against the condemnor for any damage to its
business, relocation costs, and damage to its fixtures, furniture, equipment and leasehold
improvements (but not any leasehold improvements paid for by Landlord or reimbursed to Tenant
through an allowance).

13. ASSIGNMENT AND SUBLETTING.

     (A) LANDLORD’S CONSENT. Tenant shall not sell, assign, encumber, mortgage or transfer this
Lease or any interest therein, sublet or permit the occupancy or use by others of the Premises or
any part thereof, or allow any transfer hereof of any lien upon Tenant’s interest by operation of
law or otherwise (collectively, a “Transfer”) without the prior written consent of Landlord (except
for Permitted Transfers, as more fully set forth below), which consent shall not be unreasonably
withheld, conditioned or delayed, and denial of such consent may be based upon, but not limited to,
the following:

          (i) In the reasonable judgment of Landlord, the subtenant or assignee (a) is, of a character
or engaged in a business or proposes to use the Premises in a manner which is not in keeping with
the standards of a Comparable Building, or would diminish the value of the Building, or (b) has an
unfavorable reputation, or (c) unfavorable credit standing unless Tenant and Guarantor remain
liable under the lease;

          (ii) Tenant is in default under this Lease beyond any applicable notice or cure period;

          (iii) The proposed subtenant is a third party prospect (including tenants) with whom Landlord
has either sent or received a written proposal to lease space within the preceding ninety (90) days
concerning the leasing of space within the Building or the building located at 585 North Dairy
Ashford, Houston, Texas (and the space which Landlord proposes to lease is in direct competition
with the space offered by Tenant (e.g., the proposed sublessee would not lease both Tenant’s space
and Landlord’s space and Landlord has other available space sufficient to satisfy the proposed
sublessee’s requirements)), unless the offer was rejected by the prospective tenant and the parties
are not then negotiating a new offer;

          (iv) The occupancy of the Premises by the proposed subtenant would cause Landlord’s insurance
to be cancelled or increased;

          (v) The use is not a use generally in keeping with the uses allowed at Comparable Buildings;
or

          (vi) The use is a Prohibited Use.

          (vii) The proposed subtenant or assignee is any one of the following entities or their
Affiliates, successors or assigns (unless waived in writing by WorleyParsons Group Inc. or its
successor entity): KBR, URS (Washington Group), Wood Group (JP Kenny, Mustang Engineering,
Alliance Engineering), AMEC (AMEC

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Paragon), or Technip (each a “Prohibited Entity”). Following the
first anniversary of the Commencement Date, in the event that Tenant can supply to Landlord
reasonable written evidence (in the form of a then current request for proposal (or similar
document)) that any of the Prohibited Entities would have been interested in subleasing the
Premises (or applicable portion thereof) or accepting an assignment of this Lease, then Tenant may
make a Transfer pursuant to Section 13(A)(iii) above, other than to then current tenants of the
Complex unless Landlord can not accommodate them.

     Landlord’s consent to any Transfer shall be granted or withheld in accordance with Section 13
and must be given (or rejected) within fifteen (15) business days of receipt by Landlord of such
written request from Tenant (which request shall identify the transferee and contain applicable
financial information on the transferee).

     Under no circumstances shall Tenant be released from any liability accruing under this Lease
before or after any Transfer, unless specifically agreed to otherwise by Landlord in writing.

     Any Transfer which is not in compliance with the provisions of this Section 13 shall, at the
option of Landlord, be void and of no force or effect.

     (B) NOTICE TO LANDLORD. Tenant shall provide written notice of the proposed assignee,
subtenant or transferee, as applicable, which notice shall provide Landlord with (i) the name and
address of the proposed subtenant, assignee, pledgee, mortgagee or transferee, (ii) a reasonably
detailed description of such person or entity’s business, and (iii) such other information as
Landlord may reasonably require. If Landlord does not send written notice of disapproval to Tenant
with respect to a request for approval of a sublease or assignment within ten (10) business days
after Landlord’s receipt of Tenant’s request for approval, Landlord shall be deemed to have not
approved the sublease or assignment as submitted; however, following the expiration of such ten
(10) business day period, Tenant may elect to deliver a second written notice to Landlord
requesting approval of the applicable sublease or assignment, and if Landlord fails to respond
within five (5) business days thereafter, Landlord shall be deemed to have approved the applicable
sublease or assignment.

     (C) EXCESS RENT. Except in connection with a Permitted Transfer, if Tenant shall sublet the
Premises or any part thereof or assign any interest in this Lease at a rental rate (or additional
consideration) in excess of the then current Base Rent and Operating Expenses per rentable square
foot, then fifty percent (50%) of the excess Rent (or additional consideration) shall be and become
the property of Landlord and shall be paid to Landlord as it is received by Tenant, after deducting
(from the first excess Rent so received), as and when incurred by Tenant, Tenant’s reasonable
brokerage (excluding commissions paid to brokers who are Tenant’s Affiliates), legal and other
expenses, including advertising, remodeling, alterations and concession costs (“Tenant’s Costs”)
incurred in connection with such assignment or sublease. If Tenant shall sublet the Premises or
any part thereof, Tenant shall be responsible for all actions and neglect of the subtenant and its
officers, partners, employees, agents, guests and invitees as if such subtenant and such persons
were employees of Tenant. Nothing in this Section shall be construed to relieve Tenant from the
obligation to obtain Landlord’s prior written consent to any proposed sublease.

     (D) RECAPTURE. This Section 13(D) shall not be applicable to Permitted Transfers, or to a
subleasing of less than substantially all of the Premises. Upon giving Landlord notice pursuant to
Section 13(B) above, Landlord shall have the right, to be exercised by giving written notice to
Tenant within ten (10) business days after receipt of Tenant’s notice, to recapture the space
described in Tenant’s notice and such recapture notice shall, if given, cancel and terminate this
Lease with respect to the space and for the term therein described as of the date stated in
Tenant’s notice. If Landlord shall elect to give the aforesaid recapture notice, then the Lease
Term shall expire and end on the date stated in Tenant’s notice as fully and completely as if that
date had been herein definitely fixed for the expiration of the Lease Term, unless Tenant rescinds
its request to Transfer within ten (10) business days following Landlord’s delivery of the
recapture notice.

     (E) INCLUDED AND EXCLUDED TRANSFERS. Neither this Lease nor any interest therein nor any
estate created thereby shall pass by operation of law or otherwise to any trustee, custodian or
receiver in bankruptcy of Tenant or any assignee for the assignment of the benefit of creditors of
Tenant. Notwithstanding any provision of this Lease to the contrary, provided that Tenant and
Guarantor remain liable on this Lease, Tenant has provided Landlord with prior written notice and
names of the applicable transferee, Tenant is not then in default under this Lease beyond

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the
expiration of applicable notice and cure periods, and all other terms and conditions of this
Section are satisfied, then the following Transfers will not require Landlord’s prior consent (each
a “Permitted Transfer”): (i) to an Affiliate of Tenant, or (ii) to any successor in interest (by
sale, merger, consolidation, liquidation, reorganization or otherwise) of all or substantially all
of the assets of Tenant, provided that the financial strength of such transferee (except in the
case of a subleasing) is at least equivalent to that of Tenant immediately prior to the transfer.

     (F) NO WAIVER AND NO RELEASE. The consent by Landlord to any Transfer shall not be construed
as a waiver or release of Tenant from liability for the performance of all covenants and
obligations to be performed by Tenant under this Lease, and Tenant shall remain liable therefor,
nor shall the collection or acceptance of Rent from any assignee, subtenant or occupant constitute
a waiver or release of Tenant from any of its obligations or liabilities under this Lease. Any
consent given pursuant to this Section 13 shall not be construed as relieving Tenant from the
obligation of obtaining Landlord’s prior written consent to any subsequent assignment or
subletting.

     (G) DOCUMENT REVIEW. After Landlord’s election (i) not to recapture the space proposed to be
subleased or assigned, and (ii) to accept the proposed subtenant or assignee, but thereafter
subject to such document review and approval by Landlord, Tenant shall pay to Landlord a transfer
request fee of $1,000.00 contemporaneous with Tenant’s submission of the documentation pertaining
to the assignment, subletting or transfer. All documents utilized by Tenant to evidence any
subletting or assignment for which Landlord’s consent is required hereunder shall be subject to the
prior, reasonable approval by Landlord, which approval shall not be unreasonably withheld,
conditioned, or delayed.

     (H) LANDLORD’S ASSIGNMENT. Landlord may transfer and assign, in whole or in part, its rights
and obligations in the Building or Premises that are the subject to this Lease, in which case
Landlord shall have no further liability hereunder, provided that such transferee assumes the
obligations of Landlord hereunder.

14. ALTERATIONS BY TENANT.

     (A) Tenant shall not, without Landlord’s prior written consent, which consent shall not be
unreasonably withheld, conditioned or delayed, permit any alteration, improvement, addition or
installation in or to the Premises. Under no circumstances may Tenant make any alterations to the
structural elements of the Building, the roof, the life/safety systems, the HVAC system (except for
changes solely within the Premises), the security system for which Landlord is responsible, or
which have a material adverse affect on any other Building systems. Notwithstanding the foregoing,
written consent of Landlord shall not be required and Tenant may make alterations to the interior
of the Premises that comply with the following requirements: (i) is non-structural in nature
(except that installation or removal of demising walls and interior offices shall be permitted);
(ii) does not adversely affect the roof or any area outside of the Premises; (iii) does not
materially affect the electrical, plumbing, HVAC or mechanical systems in the Building or servicing
the Premises, or the sprinkler or other life safety system; (iv) costs less than $50,000.00 for
each such alteration project in the aggregate; (v) Landlord receives prior written notice; and (vi)
Tenant is not then in default beyond any applicable notice or cure period. All work performed by
or at the request of Tenant shall be performed by contractors and subcontractors approved in
writing by Landlord (which approval shall not be unreasonably withheld, conditioned or delayed) and
shall be required to obtain the following insurance: (i) Workman’s Compensation and Occupational
Disease Insurance in accordance with the laws of the state in which the Building is located; and
(ii) Commercial General Liability Insurance with limits for bodily injury and property damage of
not less than One Million Dollars ($1,000,000) for any one occurrence and in the aggregate.
Promptly after the completion of the alterations or improvements, Tenant, at its expense, shall
deliver to Landlord an accurate as-built drawing on CADD computer disc (to the extent such drawings
were produced), as well as a hard copy, showing such alterations or improvements in the Premises.
Landlord’s approval of any plans, specifications or work drawings shall create no responsibility or
liability on the part of Landlord for their completeness, design sufficiency or compliance with any
laws, rules and regulations of governmental agencies or authorities. As to all alterations,
additions and improvements to be made after the initial Tenant Improvements, Tenant shall pay a
construction management fee to Landlord based on a percentage of all hard and soft costs as set
forth on the following schedule:

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If Landlord Manages the Work

	 	 	 	 	 
	Cost of Work	 	Percentage Fee
	$1,000 - $100,000
	 	 	5	%
	$100,001 - $250,000
	 	 	4	%
	$250,001 - and above
	 	 	3	%

If Tenant Manages the Work

	 	 	 	 	 
	Cost of Work	 	Percentage Fee
	$1,000 - $100,000
	 	 	2.5	%
	$100,001 - $250,000
	 	 	2	%
	$250,001 - and above
	 	 	1.5	%

     Additionally, Tenant shall reimburse Landlord for all out-of-pocket third party fees
reasonably incurred by Landlord, such as architectural review and engineering consulting costs.

     Notwithstanding the foregoing, Tenant may, at Tenant’s sole cost and expense, install a
supplemental HVAC unit within the Premises. Tenant shall, at its sole cost and expense, install
and maintain a submeter for determination of the amount of chilled water consumed by the
supplemental HVAC unit and Tenant shall pay Landlord’s quoted reasonable charge for the amount of
chilled water consumed by the supplemental HVAC unit. Any expenses associated with the
installation, operation, maintenance, repair, and replacement of the unit shall be borne entirely
by Tenant, including any Landlord-approved building modifications associated with the installation.

     (B) All work herein permitted that is approved by Landlord shall be done and completed by
Tenant in a good and workmanlike manner and in compliance with all requirements of laws and of
governmental rules and regulations, as well as Building rules and regulations, and otherwise in
such manner as to cause a minimum of interference with other construction in progress and with the
transaction of business in the Building. TENANT AGREES TO INDEMNIFY LANDLORD AGAINST ALL
MECHANICS’ OR OTHER LIENS ARISING OUT OF ANY OF SUCH WORK, AND ALSO AGAINST ANY AND ALL CLAIMS FOR
DAMAGES OR INJURY WHICH MAY OCCUR DURING THE COURSE OF ANY SUCH WORK. Landlord agrees to join with
Tenant in applying for all permits necessary to be secured from governmental authorities and to
promptly execute such consents as such authorities may require in connection with any of the
foregoing work.

     (C) Landlord may require that Tenant remove any or all alterations, improvements or additions
at the expiration of the Lease Term, and restore the Premises to its prior condition, but only if
Landlord notifies Tenant in writing at the time that Landlord consents to the alteration,
improvement or addition that removal will be required upon Lease termination. Further, Landlord may
not require Tenant to remove any alterations installed pursuant to Exhibit C-1 except as
provided in Section 17(B) hereof. Unless Landlord requires their removal, all alterations,
additions and improvements which may be made on the Premises, shall become the property of Landlord
and remain upon and be surrendered with the Premises at the expiration of the Lease Term, except
for any generator installed by Tenant. Tenant shall repair any damage to the Premises caused by
the installation or removal of Tenant’s trade fixtures, furnishings and equipment, normal wear and
tear and casualty damage excepted. Without limitation to the generality of the foregoing, at all
times during the Lease Term, Tenant shall ensure that all wiring and cabling that it installs
within the Premises or Building complies with all provisions of local fire and safety codes, as
well as with the National Electric Code. Further, upon the expiration or sooner termination of the
Lease Term, Tenant shall remove all telephone and data cabling (but not electrical wiring)
installed by or at the request of Tenant within the Premises and the Building (including the
plenums, risers and rooftop) placed there by or at the direction of Tenant, unless excused in
writing by Landlord. Without limitation to the remedies available to Landlord in the event that
Tenant fails to comply with the terms and conditions of this subsection, Landlord may remove and
dispose of such wiring and cabling and Tenant shall pay to Landlord the actual reasonable amount
that Landlord incurs in the removal and disposal of any such wires and cabling.

     (D) Neither Tenant nor anyone claiming by, through, or under this Lease shall have the right
to file or place any mechanics lien or other lien of any kind or character whatsoever upon the
Premises or upon the Building or

20

 

improvement thereon, or upon the leasehold interest of Tenant
therein, and notice is hereby given that no contractor, subcontractor, or anyone else who may
furnish any material, service or labor for any building, improvements, alteration repairs or any
part thereof, shall at any time be or become entitled to any lien thereon, and for the further
security of Landlord, Tenant covenants and agrees to give actual notice thereof in advance, to any
and all contractors and subcontractors who may furnish or agree to furnish any such material,
service or labor.

15. [INTENTIONALLY OMITTED]

16. MORTGAGEE PROVISIONS; ESTOPPEL; SUBORDINATION.

     (A) Subordination. Tenant shall, upon the written request of Landlord, agree to the
subordination of this Lease and the lien hereof to the lien of any present or future mortgage upon
the Premises irrespective of the time of execution or the time of recording of any such mortgage.
Provided Landlord obtains from the holder of any such mortgage a subordination and non-disturbance
agreement (“SNDA”) with Tenant to the effect that (i) in the event of a foreclosure or other action
taken under the mortgage by the holder thereof, this Lease and the rights of Tenant hereunder shall
not be disturbed but shall continue in full force and effect so long as Tenant shall not be in
default hereunder beyond any applicable notice or cure period; and (ii) such holder shall agree
that in the event it or any successor or assign shall be in possession of the Premises, that so
long as Tenant shall observe and perform all of the obligations of Tenant to be performed pursuant
to this Lease, such mortgagee shall perform all obligations of Landlord required to be performed
under this Lease. The word “Mortgage” as used herein includes mortgages, deeds of trust and any
sale-leaseback transactions, or other similar instruments, and modifications, extensions, renewals,
and replacements thereof, and any and all advances thereunder. Tenant acknowledges that Bank of
America, N.A., a national banking association, is the current lender with respect to the Building.
Tenant’s obligation to subordinate this Lease to the existing or any future mortgage shall be
conditioned upon Lessor obtaining an executed non-disturbance agreement, substantially in the form
of non-disturbance agreement attached hereto as Exhibit E.

     (B) Estoppel. Tenant agrees that at any time within twenty (20) days following
written notice from Landlord, it will execute, acknowledge and deliver to Landlord or any proposed
mortgagee or purchaser a statement in writing certifying whether this Lease is in full force and
effect and, if it is in full force and effect, what modifications have been made to the date of the
certificates and whether or not any defaults or offsets exist with respect to this Lease and, if
there are, what they are claimed to be and setting forth the dates to which Rent or other charges
have been paid in advance, if any, and stating whether or not Landlord is in default, if so,
specifying what the default may be. The failure of Tenant to execute, acknowledge, and deliver to
Landlord a statement as above, if such failure continues for more than five (5) business days after
a second notice from Landlord to Tenant, shall constitute an acknowledgment by Tenant that this
Lease is unmodified and in full force and effect, that the Rent and other charges have been duly
and fully paid through and including the respective due dates immediately preceding the date of
Landlord’s notice to Tenant, and shall constitute as to any person, a waiver of any defaults which
may exist prior to such notice. Tenant acknowledges that Bank of America, N.A., a national banking
association, is the current lender with respect to the Building, and Tenant shall execute, upon
such lender’s request, an Estoppel Certificate substantially in the form attached as Exhibit
F, or any other commercially reasonable form required by any future lender.

     (C) Notice. Tenant agrees to give any holder of any first mortgage or first trust
deed in the nature of a mortgage (both hereinafter referred to as a “First Mortgage”) against the
Premises, or any interest therein, by registered or certified mail, a copy of any notice or claim
of default served upon Landlord by Tenant, provided that prior to such notice, Tenant has been
notified in writing (by way of service on Tenant of a copy of an assignment of Landlord’s interest
in leases, or otherwise) of the address of such First Mortgage holder. Tenant further agrees that
if Landlord shall have failed to cure any such default within thirty (30) days after such notice to
Landlord (or if such default cannot be cured or corrected within that time, then such additional
time as may be necessary if Landlord has commenced within such thirty (30) days and is diligently
pursuing the remedies or steps necessary to cure or correct such default), then the holder of the
First Mortgage shall have an additional thirty (30) days within which to cure or correct such
default (or if such default cannot be cured or corrected within that time, then such additional
time as may be necessary if such holder of the First Mortgage has commenced to cure such default
within such thirty (30) day period and is diligently pursuing the remedies or steps necessary to
cure or correct such default, including the time necessary to obtain possession if possession is
necessary to cure or correct such default).

21

 

     (D) Quiet Enjoyment. Landlord covenants that it has good and sufficient right to
enter into this Lease and that Landlord alone has full right to lease the Premises for the Lease
Term aforesaid. Landlord further covenants that, upon performing the terms and obligations of
Tenant under this Lease, Tenant will have quiet enjoyment throughout the Lease Term and any renewal
or extension thereof, subject, however, to all provisions of this Lease and all laws, liens,
encumbrances and restrictive covenants to which the Land is subject.

17. EXPIRATION OF LEASE AND SURRENDER OF POSSESSION.

     (A) Holding Over. Tenant will, at the termination of this Lease by lapse of time or
otherwise, yield up immediate possession to Landlord. If Tenant retains possession of the Premises
or any part thereof after such termination, then Landlord may, at its option, serve written notice
upon Tenant that such holding over constitutes any one of (i) creation of a month-to-month tenancy,
upon the terms and conditions set forth in this Lease, or (ii) creation of a tenancy at sufferance,
in any case upon the terms and conditions set forth in this Lease; provided, however, that the
monthly Rent (or daily Rent under (ii)) shall, in addition to all other sums which are to be paid
by Tenant hereunder, whether or not as additional Rent, be equal to one hundred fifty percent
(150%) of the Rent being paid monthly to Landlord under this Lease immediately prior to such
termination; however, such holdover Rent shall be prorated in the case of (ii) on the basis of a
365-day year for each day Tenant remains in possession. If no such notice is served, then a
tenancy at sufferance shall be deemed to be created at the Rent in the preceding sentence. Tenant
shall also pay to Landlord all damages sustained by Landlord resulting from retention of possession
by Tenant, including the loss of any proposed subsequent tenant for any portion of the Premises.
The provisions of this paragraph shall not constitute a waiver by Landlord of any right of re-entry
as herein set forth; nor shall receipt of any Rent or any other act in apparent affirmance of the
tenancy operate as a waiver of the right to terminate this Lease for a breach of any of the terms,
covenants, or obligations herein on Tenant’s part to be performed.

     (B) Removal and Restoration. Tenant shall remove such equipment, furnishings and
machinery installed by it at Tenant’s cost, as well as all improvements for which Landlord requires
(which requirement shall be made at the time that Landlord approves the plans for the applicable
improvement(s)) removal at the time of its consent thereto (or if no consent was required, then
Landlord may require removal at any time). All initial Tenant improvements to the Premises shall
remain and be surrendered with the Premises, except that Landlord reserves the right to require
Tenant to remove any above building standard improvements, including, without limitation, the
following (to the extent applicable): special computer equipment, security systems, door mag
locks, UPS systems, power generators, kitchen equipment, above standard plumbing, above standard
fixtures, cafeteria equipment (including oven hoods), interior stairwell and computer flooring by
written notice to Tenant. Upon removal of any equipment, furnishings and machinery, Tenant shall
repair any damage caused by such removal or installation.

     (C) Surrender. Except as set forth Section 17(B) above, upon the expiration of this
Lease, by lapse of time or otherwise, any improvements or additions erected on and attached to the
Premises by Tenant shall be and become the property of Landlord without any payment therefor and
Tenant shall surrender the Premises, together with all improvements or additions thereon, whether
erected by Tenant or Landlord, ordinary wear and tear, damage by fire or other casualty and repairs
which are the responsibility of Landlord excepted. Any items of personal property left in the
Premises following the expiration or sooner termination of the Lease, if such failure continues
uncured for more than ten (10) days after written notice thereof from Landlord to Tenant, may, at
Landlord’s option, become the sole and exclusive property of Landlord and this Lease shall act as a
bill of sale therefor, and Landlord may sell or discard such property. Landlord shall not have to
take any special precautions or measures with regards to any property left within the Premises and
Landlord shall not be deemed a bailee thereof. Without limitation to the generality of the
foregoing, Landlord may discard computers, records, files, and data without regards to protecting
the confidentiality of any information contained therein.

18. DEFAULT. The occurrence of one or more of the following events shall constitute a material
default and breach of this Lease by Tenant (a “default” or “Event of Default”):

     (A) Failure by Tenant to make payment of any Rent herein agreed to be paid or any other
payment required to be made by Tenant hereunder, as and when due, and such a failure shall continue
for a period of five (5) business days thereafter (provided, however, Tenant shall be entitled to
written notice and a grace period of five (5) business days after such written notice from Landlord
on two (2) occasions during any twelve (12) month period, not to

22

 

exceed a total of five (5) such
notices and grace periods during the Lease Term, before Tenant shall be deemed to be in default);

     (B) The making by Tenant of any assignment or arrangement for the benefit of creditors;

     (C) The filing by Tenant of a petition in bankruptcy or for any other relief under the Federal
Bankruptcy Law or any other applicable statute;

     (D) The levying of an attachment, execution of other judicial seizure upon Tenant’s property
in or interest under this Lease, which is not satisfied or released or the enforcement thereof
stayed or superseded by an appropriate proceeding within thirty (30) days thereafter;

     (E) The filing of an involuntary petition in bankruptcy or for reorganization or arrangement
under the Federal Bankruptcy Law against Tenant and such involuntary petition is not withdrawn,
dismissed, stayed or discharged within sixty (60) days from the filing thereof;

     (F) The appointment of a Receiver or Trustee to take possession of the property of Tenant or
of Tenant’s business or assets, and the order or decree appointing such Receiver or Trustee shall
have remained in force undischarged or unstayed for thirty (30) days after the entry of such order
or decree;

     (G) The failure by Tenant to perform or observe any other term, covenant, agreement or
condition to be performed or kept by Tenant under the terms, conditions, or provisions of this
lease, and such a failure shall continue uncorrected for ten (10) business days after written
notice thereof has been given by Landlord to Tenant (provided, however, if such failure cannot be
cured within such ten (10) business day period, so long as Tenant commenced the curing of such
failure within such ten (10) business day period, and diligently prosecutes said cure to
completion, then Tenant shall submit to Landlord a detailed plan to cure and timeline).

     (H) Notwithstanding any other term or conditions of this lease to the contrary, Landlord shall
not be in default unless Landlord fails to perform obligations required of Landlord and such
failure continues for more than thirty (30) days after written notice by Tenant; provided, however,
that if the nature of Landlord’s obligation is such that more than thirty (30) days are required
for performance, then Landlord shall not be in default if Landlord commences performance within
such thirty (30) day period and thereafter diligently prosecutes the same to completion. Said
notice shall specify the exact alleged default. Following said notice and cure period (and any
additional cure period afforded under this Lease to any applicable lender, mortgagee, ground lessor
or other third party), Tenant may then (i) take any remedy available to it under this Lease; or
(ii) bring an action in a court of law to seek an award for damages (in no event shall Tenant be
entitled to withhold rents or terminate this lease without a binding final judgment or decision by
a court or arbitrator).

19. REMEDIES. During the existence of any default, Landlord may, in addition to all other rights
and remedies afforded Landlord hereunder or by Law, take any of the following actions:

     (A) Terminate the Lease. Terminate this Lease by giving Tenant written notice thereof,
in which event, Tenant shall pay to Landlord the sum of (1) all Rent accrued hereunder through the
date of termination, (2) all other amounts due under this Lease, (3) an amount equal to the total
Rent that Tenant would have been required to pay for the remainder of the Lease Term discounted to
present value at a per annum rate equal to the “Prime Rate” as published in The Wall Street
Journal, in its listing of “Money Rates” as of the date this Lease is so terminated, (4) the cost
of removing any tenant improvements, and (5) the portion of any brokerage commissions and tenant
improvement allowances payable on any new lease for the Premises (or portion thereof), in both
cases prorated to the then-remaining Lease Term; provided, however, in the event of an acceleration
of future Rent, whether pursuant to the preceding provisions of this paragraph or otherwise, Tenant
shall be entitled to a credit in the amount that Tenant can prove is the reasonable net value of
rental that Landlord would likely receive during the remainder of the Lease Term following the
period that Landlord would need to market the Premises, negotiate the new lease, build out the
premises and rental to commence under the new lease.

23

 

     (B) Terminate Tenant’s Right of Possession. Terminate Tenant’s right to possess the
Premises without terminating this Lease by giving written notice thereof to Tenant, in which event
Tenant shall pay to Landlord (1) all Rent and other amounts accrued hereunder to the date of
termination of possession, (2) all other amounts due from time to time under this Lease, and (3)
all Rent and other sums required hereunder to be paid by Tenant during the remainder of the Lease
Term, diminished by any net sums thereafter received by Landlord through reletting the Premises
during such period; in any such reletting, Tenant shall be relieved of its obligations under this
Lease as of the date of such
reletting (however, Tenant shall remain liable for any monetary deficiencies). Landlord shall use
commercially reasonable efforts (consistent with applicable law) to mitigate its damages after an
event of default by Tenant; provided, however, Landlord does not guarantee that any such mitigation
efforts shall be successful. Tenant hereby acknowledges that (i) Landlord may reasonably elect to
lease other comparable available space in the Building, or in other buildings owned by Landlord or
Landlord’s Affiliates, before reletting the Premises, (ii) Landlord need not enter into any new
lease that Landlord does not reasonably deem to be acceptable, and (iii) Landlord may decline to
incur expenses to relet, other than customary leasing commissions and legal fees for negotiation of
a lease with a new tenant. Tenant shall not be entitled to the excess of any consideration
obtained by reletting over the Rent due hereunder, except such excesses shall be used to offset any
additional amounts payable by Tenant under this Section 19. Reentry by Landlord to the Premises
shall not affect Tenant’s obligations hereunder for the unexpired Lease Term; rather, Landlord may,
from time to time, bring action against Tenant to collect amounts due by Tenant, without the
necessity of Landlord’s waiting until the expiration of the Lease Term. Actions to collect amounts
due by Tenant to Landlord under this subsection may be brought from time to time on one or more
occasions, without the necessity of Landlord waiting until the Expiration Date of this Lease.
Unless Landlord delivers written notice to Tenant expressly stating that it has elected to
terminate this Lease, all actions taken by Landlord to exclude or dispossess Tenant of the Premises
shall be deemed to be taken under this subsection. If Landlord elects to proceed under this
Section (B), it may at any time elect to terminate this Lease under (A) above. No re-entry by
Landlord or any action brought by Landlord to remove Tenant from the Premises shall operate to
terminate this Lease unless Landlord shall have given written notice of termination to Tenant, in
which event Tenant’s liability shall be as above provided.

     (C) Lock Out. In the event of a monetary default in an amount in excess of one full
month of gross rental (Base Rent, Operating Expenses and Taxes) following any applicable notice and
cure period, or unauthorized holding over by Tenant for more than one hundred twenty (120) days
following a written notice to vacate, Landlord may alter locks or other security devices at the
Premises to deprive Tenant of access thereto, and Landlord shall not be required to provide notice
or a new key or right of access to Tenant. This Lease supersedes Section 93.002 of the Texas
Property Code to the extent of any conflict.

     (D) Landlord’s Other Rights and Remedies. Upon any default, Tenant shall pay to
Landlord all costs incurred by Landlord (including court costs and reasonable attorneys’ fees and
expenses) in (1) obtaining possession of the Premises, (2) removing, storing and/or disposing of
Tenant’s or any other occupant’s property, (3) repairing, restoring, altering, remodeling, or
otherwise putting the Premises into condition required by this Lease, (4) reletting all or any part
of the Premises (including brokerage commissions (prorated based on the time between the
commencement of the new lease and the Expiration Date of this Lease), and other costs incidental to
such reletting, but not the cost of new improvements for the new tenant), (5) performing Tenant’s
obligations which Tenant failed to perform, and (6) enforcing, or advising Landlord of, its rights,
remedies, and recourses. Landlord’s acceptance of Rent following an Event of Default shall not
waive Landlord’s rights regarding such Event of Default. Landlord’s receipt of Rent with knowledge
of any default by Tenant hereunder shall not be a waiver of such default, and no waiver by Landlord
of any provision of this Lease shall be deemed to have been made unless set forth in writing and
signed by Landlord. No waiver by Landlord of any violation or breach of any of the terms contained
herein shall waive Landlord’s rights regarding any future violation of such term or violation of
any other term. If Landlord repossesses the Premises pursuant to the authority herein granted,
then Landlord shall have the right to (i) remove and store, at Tenant’s expense, or (ii) sell at
auction (following written notice and a thirty (30) day cure period) all of the furniture, trade
fixtures, equipment and other personal property in the Premises, including that which is owned by
or leased to Tenant at all times before any foreclosure thereon or repossession thereof by any
lessor thereof or third party having a lien thereon. Landlord may relinquish possession of all or
any portion of such furniture, trade fixtures, equipment and other property to any person (a
“Claimant”) who presents to Landlord a copy of any instrument represented by Claimant to have been
executed by Tenant (or any predecessor of Tenant) granting Claimant the right under various
circumstances to take possession of such furniture, trade fixtures, equipment or other property,
without the necessity on the part of Landlord to inquire into the authenticity or legality of the
instrument. Landlord may, at its option and without prejudice to or

24

 

waiver of any rights it may
have, (a) escort Tenant and or its employees to the Premises to retrieve any personal belongings of
Tenant and/or its employees not covered by the security interest, or (b) obtain a list from Tenant
of the personal property of Tenant and/or its employees, and make such property available to Tenant
and/or Tenant’s employees; however, Tenant first shall pay in cash all reasonable costs and
reasonable estimated expenses to be incurred in connection with the removal of such property and
making it available. No right or remedy granted to Landlord herein is intended to be exclusive of
any other right or remedy, and each and every right and remedy herein provided shall be cumulative
and in addition to any
other right or remedy hereunder or now or hereafter existing in law or equity or by statute. All
rights may be exercised at any time, in any order, or Landlord may forebear upon any right, without
any waiver by Landlord. In the event of termination of this Lease, Tenant waives any and all
rights to redeem the Premises either given by any statute now in effect or hereafter enacted.

     (E) Late Fee. If any Rent or other payment required of Tenant under this Lease is not
paid when due, Landlord may charge Tenant, and Tenant shall pay upon demand a fee equal to five
percent (5%) of the delinquent payment to reimburse Landlord for its cost and inconvenience
incurred as a consequence of Tenant’s delinquency. Notwithstanding the foregoing, Tenant shall be
entitled to written notice and a five (5) business day cure period on two (2) occasions during any
twelve (12) month period (not to exceed a total of five (5) such notice and cure periods during the
Lease Term) before such late fee is assessed. All such fees shall be additional Rent.

     (F) Interest. Tenant shall pay interest on all amounts that are more than thirty (30)
days overdue at the compounded annual rate of fifteen percent (15%) commencing as of the expiration
of such thirty (30) day period and continuing until paid in full, but in no amount greater than the
maximum allowable rate under law.

     (G) No Waiver. Receipt by Landlord of Rent or other payments from Tenant shall not be
deemed to operate as a waiver of any rights of Landlord to enforce payment of any Rent, additional
Rent, or other payments previously due or which may thereafter become due, or of any rights of
Landlord to terminate this Lease or to exercise any remedy or right which otherwise might be
available to Landlord, the right of Landlord to declare a forfeiture for each and every breach of
this Lease is a continuing one for the life of this Lease.

25

 

20. MISCELLANEOUS.

     (A) Not Void. If any term or provision of this Lease is declared invalid or
unenforceable, the remainder of this Lease shall not be affected by such determination and shall
continue to be valid and enforceable.

     (B) Entire Agreement. This Lease contains the entire agreement between the parties
hereto and may only be amended in writing.

     (C) Authority. Tenant shall supply to Landlord, contemporaneously with the delivery
of this Lease, a corporate resolution or other reasonably satisfactory evidence of the authority of
Tenant’s signatory to enter into this Lease.

     (D) Notices. All notices required under this Lease shall be in writing and shall be
deemed to be properly served when posted by certified United States mail, postage prepaid, return
receipt requested, or nationally recognized overnight courier, to the party to whom directed at the
address set forth in Section 1 above or at such other address as may be from time to time
designated in writing by the party changing such address.

     (E) Rent. Unless the context clearly denotes the contrary, the word “Rent” or
“Rental” as used in this Lease not only includes cash Base Rental and Tenant’s Proportionate Share
of Operating Expenses, but also all other payments and obligations to pay assumed by Tenant,
whether such obligations to pay run to Landlord or to other parties.

     (F) NO JURY TRIAL. IT IS MUTUALLY AGREED BY AND BETWEEN LANDLORD AND TENANT THAT THE
RESPECTIVE PARTIES HERETO SHALL, AND THEY HEREBY DO, WAIVE TRIAL BY JURY IN ANY ACTION, PROCEEDING
OR COUNTERCLAIM BROUGHT BY EITHER OF THE PARTIES HERETO AGAINST THE OTHER ON ANY MATTER WHATSOEVER
ARISING OUT OF OR IN ANY WAY CONNECTED WITH THIS LEASE, THE RELATIONSHIP OF LANDLORD AND TENANT,
TENANT’S USE OF OR OCCUPANCY OF THE PREMISES OR ANY CLAIM OF INJURY OR DAMAGE AND ANY EMERGENCY
STATUTORY OR ANY OTHER STATUTORY REMEDY. IF LANDLORD COMMENCES ANY SUMMARY PROCEEDING FOR
NONPAYMENT OF RENT, TENANT WILL NOT INTERPOSE ANY COUNTERCLAIM OF WHATEVER NATURE OR DESCRIPTION IN
ANY SUCH PROCEEDING.

     (G) ASHRAE. Landlord shall use commercially reasonable efforts to operate and
maintain the heating, cooling and ventilation (“HVAC”) system for the Premises in a manner
sufficient to maintain an indoor air quality substantially in accordance with the limits required
by the American Society of Heating, Air Conditioning and Refrigeration Engineers (ASHRAE) standard
62-2004. Tenant shall notify Landlord promptly upon Tenant first having knowledge of any of the
following conditions at, in, on or within the Premises: standing water, water leaks, water stains,
humidity, mold growth, or any unusual odors (including, but not limited, musty, moldy or mildewy
odors).

     (H) Confidential. Tenant and Landlord shall at all times keep all business terms and
conditions of this Lease (i.e., lease rates, concessions, tenant improvement allowances, lease term
options or rights) confidential and shall not disclose the terms thereof to any third party,
except: (i) for its employees, accountants, attorneys, brokers, agents and other professionals who
have a legitimate business reason to know the terms of this Lease, as well as prospective
purchasers and lenders; (ii) as required by any laws, rules or regulations applicable to such
party, including without limitation, the requirements of the United States Securities and Exchange
Commission or similar organization; or (iii) in connection with any legal proceedings. Any
announcements, communication or publicity by either Landlord or Tenant regarding the subject lease
transaction shall occur after the Effective Date, and only then with the prior written consent of
both parties.

     (I) OFAC Compliance.

          (a) Tenant represents and warrants that: (1) To the best of Tenant’s knowledge, after
reasonable inquiry, Tenant is: (i) not currently identified on the Specially Designated Nationals
and Blocked Persons List maintained by the Office of Foreign Assets Control, Department of the
Treasury (“OFAC”) and/or on any other similar list maintained by OFAC pursuant to any authorizing
statute, executive order or regulation (collectively, the

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“List”), and; (ii) is not a person or
entity with whom a citizen of the United States is prohibited to engage in transactions by any
trade embargo, economic sanction, or other prohibition of United States law, regulation, or Executive
Order of the President of the United States; (2) None of the funds or other assets of Tenant
constitute property of, or are beneficially owned, directly or indirectly, by any Embargoed Person
(as hereinafter defined); (3) No Embargoed Person has any interest of any nature whatsoever in
Tenant (whether directly or indirectly); (4) None of the funds of Tenant have been derived from any
unlawful activity with the result that the investment in Tenant is prohibited by law or that the
Lease is in violation of law, and; (5) Tenant has implemented procedures, and will consistently
apply those procedures to ensure the foregoing representations and warranties remain true and
correct at all times.

          (b) Tenant covenants and agrees: (1) To comply with all requirements of law relating to money
laundering, anti-terrorism, trade embargos and economic sanctions, now or hereafter in effect; (2)
To immediately notify Landlord in writing if any of the representations, warranties or covenants
set forth in this paragraph or the preceding paragraph are no longer true or have been breached or
if Tenant has a reasonable basis to believe that it may no longer be true or have been breached;
(3) To not knowingly use funds from any “Prohibited Person” (as such term is defined in the
September 24, 2001 Executive Order Blocking Property and Prohibiting Transactions With Persons Who
Commit, Threaten to Commit, or Support Terrorism) to make any payment due to Landlord under the
Lease, and (4) At the request of Landlord, to provide such information as may be requested by
Landlord to determine Tenant’s compliance with the terms hereof.

          (c) Tenant hereby acknowledges and agrees that Tenant’s inclusion on the List at any time
during the Lease Term shall be a material default of the Lease. Notwithstanding anything herein to
the contrary, Tenant shall not permit the Premises or any portion thereof to be used or occupied by
any person or entity on the List or by any Embargoed Person (on a permanent, temporary or transient
basis), and any such use or occupancy of the Premises by any such person or entity shall be a
material default of the Lease.

          (d) Tenant shall also require and shall take reasonable measures to ensure compliance with the
requirement that no person who owns any other direct interest in Tenant is or shall be listed on
any of the Lists or is an Embargoed Person. The term Embargoed Person means any person, entity or
government subject to trade restrictions under U.S. law, including but not limited to, the
International Emergency Economic Powers Act, 50 U.S.C. §1701 et seq., The Trading with the Enemy
Act, 50 U.S.C. App. 1 et seq., and any Executive Orders or regulations promulgated thereunder with
the result that the investment in Tenant is prohibited by law or Tenant is in violation of law
(“Embargoed Person”). This Subsection (d) shall not apply to any person to the extent that such
person’s interest in Tenant is through a U.S. Publicly-Traded Entity. As used in this Agreement,
U.S. Publicly-Traded Entity means a Person, other than an individual, whose securities are listed
on a national securities exchange, or quoted on an automated quotation system, in the United
States, or a wholly-owned subsidiary of such a person (“U.S. Publicly-Traded Entity”).

     (J) Wi-Fi. Tenant shall have the right to install a Wireless Fidelity Network (“Wi-Fi
Network”) within the Premises for the use of Tenant. Notwithstanding anything to the contrary
contained herein, Tenant shall, at its sole cost and expense upon termination of this Lease, remove
the Wi-Fi Network from the Premises and restore any affected portion of the Premises to
substantially the condition as existed prior to installation of such Wi-Fi Network. Tenant agrees
that Tenant’s communications equipment associated with the Wi-Fi Network that will not cause radio
frequency, electromagnetic, or other interference to any other party, or occupants of the Building
or any other party. Should any interference occur, Tenant shall take all necessary steps as soon
as commercially practicable and no later than three calendar days following such occurrence to
correct such interference. If such interference continues after such three-day period, Tenant
shall immediately cease operating Tenant’s communications equipment until such interference is
corrected or remedied to Landlord’s satisfaction. Tenant acknowledges that Landlord has granted
and/or may grant leases, licenses and/or other rights to other tenants and occupants of the
Building and to telecommunication service providers. Tenant hereby indemnifies, hold harmless, and
defends Landlord (except for matters directly resulting from Landlord’s gross negligence or willful
misconduct) against all claims, losses or liabilities arising as a result of Tenant’s use and/or
construction of any Wi-Fi Network.

     (K) Successors, Assigns and Liability. The terms, covenants, conditions and
agreements herein contained and as the same may from time to time hereafter be supplemented,
modified or amended, shall apply to, bind, and inure to the benefit of the parties hereto and their
legal representatives, successors and assigns, respectively. In the

27

 

event either party now or
hereafter shall consist of more than one person, firm or corporation, then and in such event all
such person, firms and/or corporations shall be jointly and severally liable as parties hereunder.

     (L) Exculpatory Provisions. It is expressly understood and agreed by and between the
parties hereto, anything herein to the contrary notwithstanding, that each and all of the
representations, warranties, covenants, undertakings and agreements herein made on the part of
Landlord while in form purporting to be the representations, warranties, covenants, undertakings
and agreements of Landlord are nevertheless each and every one of them made and intended, not as
personal representations, warranties, covenants, undertakings and agreements by Landlord or for the
purpose or with the intention of binding Landlord personally, but are made and intended for the
purpose only of subjecting Landlord’s interest in the Premises to the terms of this Lease and for
no other purpose whatsoever, and in case of default hereunder by Landlord, Tenant shall look solely
to the interests of Landlord in the Premises; and that Landlord shall not have any personal
liability to pay any indebtedness accruing hereunder or to perform any covenant, either express or
implied, herein contained, all such personal liability, if any, being expressly waived and released
by Tenant and by all persons claiming by, through or under Tenant.

     (M) Laws that Govern. Landlord and Tenant agree that the term and conditions of this
Lease shall be governed by the Laws of the State of Texas. Venue is proper in the jurisdiction in
which the Building is located, and the parties hereby submit themselves to the jurisdiction of the
courts located therein.

     (N) Financial Statements. Within ten (10) business days after Landlord’s request, but
not more than twice per year, Tenant shall deliver to Landlord the then current audited financial
statements of Tenant, and audited financial statement of the two (2) years prior to the current
financial statements year, with an opinion of a certified public accountant. This information
includes a balance sheet, cash flow statement, and profit and loss statement for the most recent
prior year, all prepared in accordance with generally accepted accounting principles consistently
applied. Tenant shall not be required to report the financial information of Tenant so long as
Tenant is required to report such financial information to the United States Securities and
Exchange Commission and the same are available to the public.

     (O) Landlord’s Lien. LANDLORD HEREBY AGREES NOT TO UNREASONABLY WITHHOLD ITS CONSENT
TO OR EXECUTION OF A SUBORDINATION OF ITS LIEN IN AND TO ANY FURNITURE, FIXTURES, INVENTORY,
RECEIVABLES, EQUIPMENT OR OTHER PERSONAL PROPERTY OF TENANT TO THE LIEN OF ANY LEGITIMATE
THIRD-PARTY LENDER REQUIRING SUCH SUBORDINATION (PROVIDED THAT TENANT PROVIDES UPDATED FINANCIALS
AND LANDLORD MAY REQUIRE ADDITIONAL SECURITY UNDER THE LEASE). Landlord hereby waives any
statutory lien on Tenant’s furniture, fixtures, equipment and other personal property located
within the Premises.

     (P) Access to Premises. Landlord and its authorized agents shall have free access to
the Premises at any and all reasonable times for customary services (such as regular janitorial
services and other services that Landlord is required to perform on a regular basis pursuant to
this Lease), and for non-customary services (such as non-emergency repairs) upon at least twenty
four (24) hours’ verbal notice to Tenant, to inspect the same and for the purposes pertaining to
the rights of Landlord. Landlord shall use commercially reasonable efforts to minimize any
interference with operation of Tenant’s business from the Premises during any such entry. During
the last twelve (12) months of the Lease Term (as may have been extended) Landlord may show the
Premises to prospective lessees.

     (Q) Real Estate Brokers. Tenant represents that Tenant has directly dealt with and
only with brokers identified in Article 1 (whose commission shall be paid by Landlord pursuant to a
separate agreement with each such broker), in connection with this Lease and TENANT AGREES TO
INDEMNIFY AND HOLD LANDLORD HARMLESS FROM ALL DAMAGES, LIABILITY, AND EXPENSE (INCLUDING REASONABLE
ATTORNEY’S FEES) ARISING FROM ANY CLAIMS OR DEMANDS OF ANY OTHER BROKER OR BROKERS OR FINDERS FOR
ANY COMMISSION ALLEGED TO BE DUE SUCH BROKER OR BROKERS OR FINDERS IN CONNECTION WITH ITS
PARTICIPATING IN THE NEGOTIATION WITH TENANT OF THIS LEASE.

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     (R) Force Majeure. Whenever a period of time is herein prescribed for action to be
taken by Landlord or Tenant, the party taking the action shall not be liable or responsible for,
and therefore shall be excluded from the computation of any such period of time, any delays due to
strikes, riots, acts of God, shortages of labor or materials, terrorist activities, acts of war,
governmental actions or inactions or laws, regulations, or restrictions, or any other causes of any
kind whatsoever which are beyond the control of such acting party, and which in any of such events,
can not be overcome by the commercially reasonable efforts of the acting party (“Force Majeure”);
provided, however, in no event shall Force Majeure apply to either (i) the financial obligations of
Tenant under this Lease, including, without limitation, Tenant’s obligation to promptly pay Rent,
or (ii) Tenant’s obligation to maintain insurance hereunder.

     (S) WAIVER OF RIGHTS UNDER THE DECEPTIVE TRADE PRACTICES — CONSUMER PROTECTION
ACT. TENANT WAIVES ITS RIGHTS UNDER THE DECEPTIVE TRADE PRACTICES — CONSUMER PROTECTION ACT,
SECTION 17.41, ET. SEQ., BUSINESS CODE, A LAW THAT GIVES CONSUMERS SPECIAL RIGHTS AND PROTECTIONS,
AFTER CONSULTATION WITH AN ATTORNEY OF TENANT’S OWN SELECTION, TENANT VOLUNTARILY CONSENTS TO THIS
WAIVER.

     (T) Energy and Environmental Initiatives. Tenant shall fully cooperate with Landlord
in any programs in which Landlord may elect to participate relating to the Building’s (i) energy
efficiency, management, and conservation; (ii) water conservation and management; (iii)
environmental standards and efficiency; (iv) recycling and reduction programs; and/or (v) safety,
which participation may include, without limitation, the Leadership in Energy and Environmental
Design (LEED) program and related Green Building Rating System promoted by the U.S. Green Building
Council. All carbon tax credits and similar credits, offsets and deductions are the sole and
exclusive property of Landlord. Tenant is not obligated to make the Premises LEED certified.
Landlord shall not require Tenant to incur any material costs for complying with the terms of this
Section 20(T) and shall only include costs under this Section in Operating Expenses to the extent
allowable under Section 5(A)(5)(e) above.

     (U) Counterparts. The parties may execute this Lease or any exhibit hereto in
counterpart copies, each of which shall be deemed originals.

     (V) Rider and Exhibits. The Rider, and Exhibits A-1, A-2, A-3, B, C-1, C-2,C-3, D, E,
F, and G are attached hereto and made a part hereof, by reference, for all purposes.

     (W) Contingency. The parties hereby acknowledge and agree that this Lease is binding
upon the parties; however, this Lease is contingent upon and subject to the approval of Bank of
America and the full negotiation of the SNDA. In the event that on or before February 3, 2009, (i)
such approval has not been granted and notice thereof delivered to Tenant, or (ii) the SNDA has not
been fully executed, then at anytime thereafter (but prior to the full satisfaction of the
contingencies set forth in this paragraph) either Party may declare this Lease void ab initio by
providing written notice to the other party, in which event (i) neither party shall be deemed to
have any rights or obligations hereunder, and (ii) the parties agree to mark each original copy of
this Lease void and send a copy of the same to the other Party. Landlord shall use commercially
reasonable efforts to obtain all approvals from Bank of America and to keep Tenant informed of
Landlord’s progress in obtaining such approvals.

[Remainder of Page Intentionally Left Blank]

29

 

[SIGNATURE PAGE]

     IN WITNESS WHEREOF, the parties may have executed this Lease in counterpart copies, each of
which shall be deemed originals. Landlord and Tenant have executed this Lease the date and year
noted above.

LANDLORD:

I-10 EC CORRIDOR #2 LIMITED PARTNERSHIP, a Delaware limited partnership

By:     TC HOUSTON, INC., a Delaware corporation, Managing Partner

	 	 	 	 	 
	 	 	 
	By:  	/s/ W.
Aaron Thielhorn	 	 
	 	Name:  	W.
Aaron Thielhorn 	 	 
	 	Title:  	Vice
President	 	 
	 	Date: 	January 27,
2009	 	 
	 

	 	 	 	 	 
	TENANT:

CARBO CERAMICS INC.,

a Delaware corporation

 	 	 
	By:  	/s/ Gary
A. Kolstad	 	 
	 	Gary A. Kolstad 	 	 
	 	Chief Executive Officer 	 	 
	Date: 	January 23,
2009	 	 
	 

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RIDER TO LEASE

ADDITIONAL PROVISIONS

1. This Rider Controls. The provisions set forth in this Rider control to the extent they
conflict with any provision or provisions set forth in the body of this Lease.

2. Extension Option. Tenant shall have the right and option to extend this Lease for one
(1) consecutive period of five (5) years under the same terms and conditions as stated in the Lease
(an “Extension Option”), with the exceptions that (a) no further extension options shall exist and
(b) monthly rental for such extension term shall be based on the Market Rental Rate (as defined
below). The “Market Rental Rate” shall mean the rental rate charged from time to time by landlords
in Class A office buildings comparable in size and condition to the Premises in the Energy Corridor
submarket area and comparable to the Building, taking into consideration the location, quality,
level of LEED certification, age of the Building, floor level on which the space is located, any
rental abatement, lease takeovers and/or assumptions, moving expenses and other concessions, tenant
improvement allowances, parking, parking rates, the term of the lease, the extent of the services
to be provided, the distinction between a “gross” and “net” lease, the base year or estimated basic
cost per square foot for escalation purposes (including operating costs, insurance, and ad valorem
taxes), the time the particular rental rate under consideration became or is to become effective,
and any other relevant term or condition, but shall not include any value or amount with respect to
any leasehold improvements. Tenant may reject the Extension Option granted herein within ten (10)
days following Tenant’s receipt of Landlord’s determination of the Market Rental Rate (“Rate
Notice”). The Extension Option shall be exercisable by Tenant, if at all, only by timely delivery
to Landlord of written notice of election between twelve (12) months and eighteen (18) months prior
to the expiration of the then current Lease Term (“Extension Notice”). The option herein granted
shall be deemed to be personal to Tenant, and if Tenant subleases any portion of the Premises or
otherwise assigns or transfers any interest thereof to another party (other than a Permitted
Transfer) and such assignment, sublease or transfer is still in effect as of the time of either the
Extension Notice or the Rate Notice, such option shall lapse. In the event that Tenant is in
default of any term or condition of the Lease beyond any applicable notice and grace period, then
there shall be no extension of this Lease as provided herein.

     If Tenant desires to continue with the extension, but objects to the Market Rental Rate
determined by Landlord, then Tenant must object to the same within said ten (10) day period. No
later than ten (10) days thereafter, Landlord and Tenant shall meet in an effort to negotiate, in
good faith, the Market Rental Rate applicable to the Premises. If Landlord and Tenant have not
agreed upon the Market Rental Rate applicable to the Premises within five (5) days, then Landlord
and Tenant shall attempt to agree, in good faith, upon a single broker not later than fifteen (15)
business days following Landlord’s delivery of the Rate Notice who shall determine the Market
Rental Rate for the Premises. If Landlord and Tenant are unable to agree upon a single broker
within such time period, then Landlord and Tenant shall each appoint one broker not later than
twenty (20) business days following Landlord’s delivery of the Rate Notice. Not later than
twenty-five (25) business days following Landlord’s delivery of the Rate Notice, the two appointed
brokers shall appoint a third broker. If either Landlord or Tenant fails to appoint a broker
within the prescribed time period, the single broker appointed shall determine the Market Rental
Rate. If both parties fail to appoint brokers within the prescribed time periods, then the first
broker thereafter selected by a party shall determine the Market Rental Rate. If a single broker
is chosen, then such broker shall determine the Market Rental Rate applicable to the Premises.
Otherwise, the Market Rental Rate shall be the arithmetic average of two (2) of the three (3)
determinations which are the closest in amount, and the third determination shall be disregarded.
Landlord and Tenant shall instruct the brokers to complete their determination of the Market Rental
Rate not later than forty-five (45) days following Landlord’s delivery of the Rate Notice. Such
arbitrator shall (i) be a qualified commercial real estate broker licensed in the State of Texas,
(ii) have at least ten (10) years experience in leasing office space in Comparable Buildings and
shall have personally negotiated five (5) or more individual leases each covering over 20,000
square feet of office space during the preceding five (5) years, (iii) not have represented either
Landlord, Tenant, or any Mortgagee during the preceding five (5) years and (iv) be generally
experienced and competent in determining market rates for office
space similar to the Leased Premises. The arbitrator shall not have the power to add to, modify,
or change any of the provisions of this Lease.

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3. Right of Refusal.

     (a) Grant of Right of Refusal. Subject to the provisions as hereinafter set forth,
Landlord hereby grants to Tenant a right of refusal (“Right of Refusal”) to lease from Landlord all
of the remaining space located on the third (3rd) floor of the Building (“Refusal
Space”). The Refusal Space is shown on Exhibit A-3 attached hereto and incorporated herein
by this reference.

     (b) Third Party Offer; Exercise Notice. So long as there are at least twenty-four
(24) months remaining on the term of this Lease (as may be extended), if Landlord desires to accept
a bona fide offer from a third party (“Third Party Offer”) to lease the Refusal Space, Landlord
shall first give to Tenant notice that Landlord has received such Third Party Offer and describing
the terms and conditions of such Third Party Offer including Rent and other relevant terms such as
Allowance, if any (“Third Party Offer Notice”). Tenant may exercise the Right of Refusal by giving
Landlord written notice of Tenant’s desire to lease the Refusal Space set forth in the Third Party
Offer (“Exercise Notice”) on or before the later of (i) three (3) business days; or (ii) five (5)
calendar days after the date of the Third Party Offer Notice.

     (c) Expansion Amendment. After receipt of the Exercise Notice, Landlord and Tenant
shall enter into an amendment of the Lease “Expansion Amendment” acceptable to Landlord and Tenant.
Such Expansion Amendment shall provide that from and after the applicable date on which the
Refusal Space is leased by Tenant (“Expansion Commencement Date”), the Lease shall be deemed
modified as follows.

          (i) Base Rent for the Refusal Space shall be as set forth in the Third Party Offer (including,
without limitation, the duration of the term of the Lease of the Refusal Space);

          (ii) Tenant’s Proportionate Share applicable to the Refusal Space shall be a fraction, the
numerator of which shall be the number of rentable square feet in the Refusal Space and the
denominator of which shall be the number of rentable square feet in the Building (as both shall be
reasonably determined by Landlord);

          (iii) Tenant shall accept the Refusal Space in the time, condition and manner described in the
Third Party Offer;

          (iv) Other applicable terms and conditions of the Third Party Offer shall modify the Lease;

          (v) For all purposes under the Lease, other than for the applicable calculations set forth
above, the term “Premises” shall be deemed to include the Refusal Space; and

          (vi) Landlord shall not be entitled to a construction management fee relating to the initial
Improvements made to the Refusal Space by Tenant (or improvements to other portions of the Premises
made contemporaneously with the initial improvements to the Refusal Space).

     (d) Failure to Exercise. If Tenant does not exercise its Right of Refusal in the time
and manner set forth herein, the Right of Refusal shall be deemed terminated and of no further
force or effect for a period of six (6) full calendar months following the date on which the Third
Party Offer Notice was delivered to Tenant (and shall thereafter be reinstated). Notwithstanding
the prior sentence to the contrary, if Landlord, within said six (6) month period, intends to lease
the Offer Space with a third party at a Net Effective Rental Rate (hereinafter defined) of less
than ninety percent (90%) of the Net Effective Rental Rate offered to Tenant in the Offer Space
Notice (and otherwise on the same terms and conditions of the Offer Space Notice), then Tenant
shall again be offered the Refusal Space on such lower terms. As used herein, the term “Net
Effective Rental Rate” shall mean the net rental rate payable to Landlord under a lease net of all
tenant inducements (e.g., tenant improvement allowances, rental
abatements, moving allowances), with the cost of such tenant inducements, together with interest
thereon at a rate of ten percent (10%) per annum, amortized over the applicable term. Except for
such waiver by Tenant under this subsection, Tenant’s rights under this Section are continuous and
Landlord shall not lease the Refusal Space at any time during the initial Lease Term without first
giving Tenant its right to lease such Refusal Space.

32

 

     (e) No Default. Tenant may exercise the Right of Refusal, and an exercise thereof
shall only be effective, provided that Tenant is not in monetary default of this Lease beyond any
applicable notice or cure period as of the date of the Third Party Offer Notice and this Exercise
Notice.

     (f) Not Transferable. Tenant acknowledges and agrees that the Right of Refusal shall
be deemed personal to Tenant and if Tenant subleases, assigns or otherwise transfers any interests
hereunder to any person or entity (except pursuant to a Permitted Transfer) and such sublease,
assignment or transfer is still in effect as of the Third Party Offer Notice or Exercise Notice,
then the Right of Refusal shall lapse and be forever waived.

4. Preferential Right to Lease.

     (a) Preferential Lease Space. So long as there are at least twenty-four (24) months
remaining on the Lease Term (as may be extended), if Landlord desires to actively market the
remaining space on the third (3rd) floor of the Building (“Preferential Lease Space”),
Landlord shall give Tenant written notice (“Preferential Lease Space Notice”) of such event.
Within fifteen (15) days after the date the Preferential Lease Space Notice is given to Tenant, the
time of giving of such notice to be of the essence of this Section, Tenant shall give Landlord
written notice (“Preferential Right Acceptance Notice”) of its election to lease the entire
Preferential Lease Space. Tenant’s obligation to pay Base Rent on the Preferential Lease Space
shall commence the earlier of (i) the date that Tenant occupies the Preferential Lease Space; or
(ii) ninety (90) days from the date that Landlord delivers the Preferential Lease Space to Tenant
for construction of Tenant’s initial leasehold improvements. The Base Rent applicable to the
Preferential Lease Space shall be the Market Rental Rate as defined in Section 2 above (and if
during the initial Lease Term of the Lease, inclusive of an allowance equal to $35.00 per rentable
square foot of space in the Preferential Lease Space multiplied by a fraction, the numerator of
which is the number of full calendar months remaining in the initial Lease Term of the Lease
following the commencement date of the lease of the Preferential Lease Space and the denominator of
which is 84).

     (b) Amendment. After receipt of any such Preferential Right Acceptance Notice,
Landlord and Tenant shall enter into an amendment to this Lease acceptable to Landlord and Tenant
to amend the Lease pursuant to the terms and conditions of the Preferential Lease Space Notice.
Except as set forth in the Preferential Lease Space Notice, the terms and conditions of the Lease
as they apply to the Premises (including, without limitation, the Expiration Date) shall govern
Tenant’s lease of the Preferential Lease Space. Landlord shall not be entitled to a construction
management fee relating to the initial Tenant Improvements to the Preferential Lease Space (or
improvements to other portions of the Premises made contemporaneously with the initial improvements
to the Preferential Lease Space).

     (c) Failure to Exercise. In the event that Tenant fails to exercise its right as
aforesaid within fifteen (15) days of the date the Preferential Lease Space Notice is given to
Tenant or, in the event Tenant shall have exercised its right and Tenant shall not have executed an
amendment of this Lease as aforesaid within fifteen (15) business days from the date Tenant is
given such an Amendment, Tenant shall be deemed to have forever waived its right under this
Section.

     (d) Not Transferable. Tenant acknowledges and agrees that any preferential rights
granted under this Section 3 shall be deemed personal to Tenant and if Tenant subleases, assigns or
otherwise transfers any interests under this Lease (other than pursuant to a Permitted Transfer),
and such assignment, sublease or other transfer is still in effect as of the Preferential Lease
Space Notice or Preferential Right Acceptance Notice, then the rights hereunder shall lapse and be
of no further force or effect.

     (e) No Default. Tenant shall be deemed to have waived its rights under this Section
in the event that Tenant is in monetary default under the Lease beyond any applicable notice and
grace period as of the date of the Preferential Lease Space Notice.

5. Generator. Provided this Lease shall be in full force and effect and Tenant shall not
be in default hereunder beyond any applicable grace period, Tenant may, at its sole cost and
expense (including reasonable screening if applicable), install and operate (for Tenant’s own use
and not for use by third parties or “for profit” services provided for the benefit of third
parties) during the Lease Term, a generator for back-up power to the

33

 

Premises (“Generator”), the
exact specifications of which shall be subject to Landlord’s prior written approval, not to be
unreasonably withheld, conditioned or delayed. Tenant may install the Generator at a location
approved by Landlord in writing, which approval shall not be unreasonably withheld, conditioned or
delayed (hereinafter the “Installation Area”). The installation of such Generator shall be subject
to the following:

     (a) Tenant shall not install or operate the Generator until it receives prior written approval
from Landlord, which approval shall not be unreasonably withheld, conditioned or delayed. Without
limitation to the generality of the preceding sentence, it shall not be unreasonable for Landlord
to withhold approval if the installation or operation of the Generator may damage the Building
and/or is not in keeping with the aesthetics of the Building. Prior to commencing installation,
Tenant shall provide Landlord with (i) detailed plans and specifications for the installation of
the Generator, (ii) copies of all required permits, licenses and authorizations, which Tenant will
obtain at its own expense and which Tenant will maintain at all times during the operation of the
Generator, and (iii) a Certificate of Insurance evidencing insurance coverage as required by this
Lease and any other insurance reasonably required by Landlord for the installation and operation of
the Generator.

     (b) Tenant shall repair in a good and workmanlike manner any damage to the Building caused by
the installation, operation or removal of the Generator. The installation, operation and removal
of the Generator will be at its sole risk. Tenant agrees to indemnify and defend Landlord against
all claims, actions, damages, liabilities and expenses including reasonable attorneys’ fees and
disbursements in connection with the loss of life, personal injury, damage to property or business
or any other loss or injury or as a result of any litigation arising out of the installation,
operation or removal of the Generator.

     (c) At the expiration or sooner termination of this Lease, or upon termination of the
operation of the Generator, or revocation of any license issued, Tenant shall remove the Generator
(and all associated wiring and other appurtenances) from the Building and repair any damage caused
thereby, at Tenant’s sole cost and expense. Tenant shall leave the Installation Area in good order
and repair. If Tenant does not remove the Generator when so required, Tenant hereby authorizes
Landlord to remove and dispose of the Generator and to charge Tenant for all reasonable costs and
expenses incurred.

6. Signage.

     (a) Building Standard Identification. During the Lease Term, at Landlord’s sole cost
and expense (but subject to inclusion as an Operating Expense to the extent allowable), Tenant
shall be entitled to reasonable identification on the electronic Building directory to be installed
by Landlord, at its sole cost and expense, in the first floor lobby of the Building. Tenant shall
be entitled to representation on such directory in a quantity substantially in proportion to the
rentable square feet in the Premises relative to the total rentable square feet in the Building.
Landlord shall provide Building-standard floor signage at no additional cost to Tenant.

     (b) Monument Signage. So long as Tenant is not in default of any term or condition of
the Lease and is renting not less than 20,000 rentable square feet of space in the Building,
Landlord will permit Tenant to place its signage (but not the signage of its subtenants or
assignees, other than Affiliates) on the monument sign associated with the Building (on a basis of
joint identification with other tenants and occupants). All costs associated with the fabrication,
installation, maintenance, removal and replacement of Tenant’s signage on the monument sign shall
be the sole responsibility of Tenant. Landlord reserves the right to place additional tenant names
on the monument sign and to relocate Tenant’s monument signage based upon the rentable square
footage
leased by other tenants in the Building. Tenant shall maintain such signage in good condition and
repair. Tenant shall remove such signage and repair any damage caused thereby, at its sole cost
and expense, upon the expiration or sooner termination of the Lease. The color, content, size and
other specifications of any such signage shall be in accordance with the terms and conditions of
the Lease, and shall be subject to Landlord’s prior approval, which approval shall not be
unreasonably withheld, conditioned or delayed. Further, Tenant shall ensure that all signage
complies with any and all applicable local zoning codes and building regulations, and meets with
the approval of Woodcreek Park Association.

34

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