Document:

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                                                                   Exhibit 10.15

                         GUARANTY OF PAYMENT AGREEMENT
                         -----------------------------

     THIS GUARANTY OF PAYMENT AGREEMENT (this "Agreement") is made this 31st
day of January, 2001, by TREX COMPANY, INC., a corporation organized under the
laws of the State of Delaware (the "Guarantor") for the benefit of BANK OF
AMERICA, N. A., a national banking association (the "Lender").

                                    RECITALS
                                    --------

     A.  Trex Company, LLC, a corporation organized under the laws of the State
of Delaware (the "Borrower") has applied to the Lender for a revolving credit
facility in the maximum principal amount of $15,000,000 to be used by the
Borrower for working capital purposes (the "Loan"), which is to be advanced
pursuant to the terms of a Financing and Security Agreement of even date
herewith (as amended, modified, restated, substituted, extended and renewed at
any time and from time to time, the "Financing Agreement") by and between the
Borrower and the Lender.

     B.  All defined terms used in this Agreement and not defined herein shall
have the meaning given to such terms in the Financing Agreement.

     C.  The Guarantor has requested that the Lender enter into the Financing
Agreement with the Borrower and make the credit facility described in the
Financing Agreement available to the Borrower.

     D.  The Lender has required, as a condition to entering into the Financing
Agreement, that the Guarantor execute this Agreement as additional security for
the payment and performance of the Obligations.

     NOW, THEREFORE, in order to induce the Lender to enter into the Financing
Agreement, the Guarantor covenants and agrees with the Lender as follows:

                                   ARTICLE I
                                 THE GUARANTY
                                 ------------

     Section 1.1  Guaranty.
                  ---------

     The Guarantor hereby unconditionally and irrevocably guarantees to the
Lender:

         (a) the due and punctual payment in full (and not merely the
collectibility) of the principal of the Obligations and the interest thereon, in
each case when due and payable, all according to the terms of any promissory
note evidencing all or any part of the Obligations and the other Financing
Documents (as that term is defined in the Financing Agreement);

         (b) the due and punctual payment in full (and not merely the
collectibility) of all other sums and charges which may at any time be due and
payable in accordance with, or secured by, any promissory note evidencing all or
any part of the Obligations or any of the other Financing Documents;

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         (c) the due and punctual performance of all of the other terms,
covenants and conditions contained in the Financing Documents; and

         (d) all indebtedness, obligations and liabilities of any kind and
nature of the Borrower to the Lender, whether now existing or hereafter created
or arising, direct or indirect, matured or unmatured, and whether absolute or
contingent, joint, several or joint and several, and howsoever owned, held or
acquired.

     Section 1.2  Guaranty Unconditional.
                  -----------------------

     The obligations and liabilities of the Guarantor under this Agreement shall
be absolute and unconditional, irrespective of the genuineness, validity,
priority, regularity or enforceability of the Financing Agreement, any
promissory note evidencing all or any part of the Obligations, or any of the
other Financing Documents or any other circumstance which might otherwise
constitute a legal or equitable discharge of a surety or guarantor.  The
Guarantor expressly agrees that the Lender may, in its sole and absolute
discretion, without notice to or further assent of the Guarantor and without in
any way releasing, affecting or in any way impairing the obligations and
liabilities of the Guarantor hereunder:

         (a)  waive compliance with, or any defaults under, or grant any other
     indulgences under or with respect to any of the Financing Documents;

         (b) modify, amend, change or terminate any provisions of any of the
     Financing Documents;

         (c) grant extensions or renewals of or with respect to any promissory
     note evidencing all or any part of the Obligations, any of the other
     Financing Documents or any of the Obligations;

         (d) effect any release, subordination, compromise or settlement in
     connection with any promissory note evidencing all or any part of the
     Obligations, any of the other Financing Documents, or any of the
     Obligations;

         (e) agree to the substitution, exchange, release or other disposition
     of any collateral for the Obligations or to the subordination of any lien
     or security interest therein;

         (f) make advances for the purpose of performing any term, provision or
     covenant contained in the Financing Agreement or any of the other Financing
     Documents with respect to which the Borrower shall then be in default;

         (g) make future advances to the Borrower pursuant to the Financing
     Agreement or any of the other Financing Documents;

         (h) assign, pledge, hypothecate or otherwise transfer the Financing
     Agreement, any of the Financing Documents or this Agreement or any interest
     therein;

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         (i) deal in all respects with the Borrower as if this Agreement were
     not in effect; and

         (j) effect any release, compromise or settlement with another
     guarantor.

     Section 1.3  Guaranty Primary.
                  -----------------

     The obligations and liabilities of the Guarantor under this Agreement shall
be primary, direct and immediate, shall not be subject to any counterclaim,
recoupment, setoff, reduction or defense based upon any claim that the Guarantor
may have against the Borrower, the Lender and/or any other guarantor and shall
not be conditional or contingent upon pursuit or enforcement by the Lender of
any remedies it may have against the Borrower with respect to any promissory
note evidencing all or any part of the Obligations or any of the other Financing
Documents, whether pursuant to the terms thereof or by operation of law.
Without limiting the generality of the foregoing, the Lender shall not be
required to make any demand upon the Borrower, or to pursue, enforce or exhaust
its remedies against the Borrower or any collateral either before, concurrently
with or after pursuing or enforcing its rights and remedies hereunder.  Any one
or more successive or concurrent actions or proceedings may be brought against
the Guarantor under this Agreement, either in the same action, if any, brought
against the Borrower or in separate actions or proceedings, as often as the
Lender may deem expedient or advisable.  Without limiting the foregoing, it is
specifically understood that any modification, limitation or discharge of any of
the liabilities or obligations of the Borrower, any other guarantor or any
obligor under any of the Financing Documents, arising out of, or by virtue of,
any bankruptcy, arrangement, reorganization or similar proceeding for relief of
debtors under federal or state law initiated by or against the Borrower or the
Guarantor or any obligor under any of the Financing Documents shall not modify,
limit, lessen, reduce, impair, discharge, or otherwise affect the liability of
the Guarantor hereunder in any manner whatsoever, and this Agreement shall
remain and continue in full force and effect.  It is the intent and purpose of
this Agreement that the Guarantor shall and does hereby waive all rights and
benefits which might accrue to any other guarantor by reason of any such
proceeding, and the Guarantor agrees that it shall be liable for the full amount
of the obligations and liabilities under this Agreement, regardless of, and
irrespective to, any modification, limitation or discharge of the liability of
the Borrower, any other guarantor or any obligor under any of the Financing
Documents, that may result from any such proceedings.

     Section 1.4  Certain Waivers by the Guarantor.
                  ---------------------------------

     The Guarantor hereby unconditionally, irrevocably and expressly waives:

         (a) presentment and demand for payment of the principal of or interest
     on any promissory note evidencing all or any part of the Obligations and
     protest of non-payment;

         (b) notice of acceptance of this Agreement and of presentment, demand
     and protest thereof;

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         (c) notice of any default hereunder or under the Financing Agreement,
     or any of the other Financing Documents and notice of all indulgences;

         (d) notice of any increase in the amount of any portion of or all of
     the indebtedness guaranteed by this Agreement;

         (e) demand for observance, performance or enforcement of any of the
     terms or provisions of this Agreement, the Financing Agreement or any of
     the other Financing Documents;

         (f) all errors and omissions in connection with the Lender's
     administration of all indebtedness guaranteed by this Agreement, except
     errors and omissions resulting from acts of bad faith;

         (g) any right or claim of right to cause a marshalling of the assets of
     the Borrower;

         (h) any act or omission of the Lender (except acts or omissions in bad
     faith) which changes the scope of the Guarantor's risk hereunder; and

         (i) all other notices and demands otherwise required by law which the
     Guarantor may lawfully waive.

     Section 1.5  Reimbursement for Expenses.
                  ---------------------------

     In the event the Lender shall commence any action or proceeding for the
enforcement of this Agreement, then the Guarantor will reimburse the Lender,
promptly upon demand, for any and all reasonable expenses incurred by the Lender
in connection with such action or proceeding including, without limitation,
reasonable attorneys' fees together with interest thereon at the Post-Default
Rate.

Section 1.6  Events of Default.
             ------------------

     The occurrence of any one or more of the following events shall constitute
an "Event of Default" under the provisions of this Agreement (individually, an
"Event of Default" and collectively, the "Events of Default"):

         (a) The failure of the Guarantor to pay any of the Obligations as and
     when due and payable in accordance with the provisions of this Agreement.

         (b) Any representation or warranty made in this Agreement or in any
     report, statement, schedule, certificate, opinion (including any opinion of
     counsel for the Guarantor), financial statement or other document furnished
     in connection with this Agreement, shall prove to have been false or
     misleading when made (or, if applicable, when reaffirmed) in any material
     respect.

         (c) The failure of the Guarantor to perform, observe or comply with any
     covenant, condition or agreement contained in this Agreement.

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         (d) A default shall occur under any of the other Financing Documents
     and such default is not cured within any applicable grace period provided
     therein.

         (e) The Guarantor shall (i) apply for or consent to the appointment of
     a receiver, trustee or liquidator of itself or any of its property, (ii)
     admit in writing its inability to pay its debts as they mature, (iii) make
     a general assignment for the benefit of creditors, (iv) be adjudicated a
     bankrupt or insolvent, (v) file a voluntary petition in bankruptcy or a
     petition or an answer seeking or consenting to reorganization or an
     arrangement with creditors or to take advantage of any bankruptcy,
     reorganization, insolvency, readjustment of debt, dissolution or
     liquidation law or statute, or an answer admitting the material allegations
     of a petition filed against it in any proceeding under any such law, or
     take corporate action for the purposes of effecting any of the foregoing,
     or (vi) by any act indicate its consent to, approval of or acquiescence in
     any such proceeding or the appointment of any receiver of or trustee for
     any of its property, or suffer any such receivership, trusteeship or
     proceeding to continue undischarged for a period of ninety (90) days, or
     (vii) by any act indicate its consent to, approval of or acquiescence in
     any order, judgment or decree by any court of competent jurisdiction or any
     Governmental Authority enjoining or otherwise prohibiting the operation of
     a material portion of the Guarantor's business or the use or disposition of
     a material portion of the Guarantor's assets.

         (f) (i) An order for relief shall be entered in any involuntary case
     brought against the Guarantor under the Bankruptcy Code, or (ii) any such
     case shall be commenced against the Guarantor and shall not be dismissed
     within ninety (90) days after the filing of the petition, or (iii) an
     order, judgment or decree under any other Law is entered by any court of
     competent jurisdiction or by any other Governmental Authority on the
     application of a Governmental Authority or of a Person other than the
     Guarantor (A) adjudicating the Guarantor bankrupt or insolvent, or (B)
     appointing a receiver, trustee or liquidator of the Guarantor, or of a
     material portion of the Guarantor's assets, or (C) enjoining, prohibiting
     or otherwise limiting the operation of a material portion of the
     Guarantor's business or the use or disposition of a material portion of the
     Guarantor's assets, and such order, judgment or decree continues unstayed
     and in effect for a period of thirty (30) days from the date entered.

         (g) Unless adequately insured in the opinion of the Lender, the entry
     of a final judgment for the payment of money involving more than $10,000
     against the Guarantor, and the failure by the Guarantor to discharge the
     same, or cause it to be discharged, within thirty (30) days from the date
     of the order, decree or process under which or pursuant to which such
     judgment was entered, or to secure a stay of execution pending appeal of
     such judgment.

         (h) If the Lender in its sole discretion determines in good faith that
     a material adverse change has occurred in the financial condition of the
     Guarantor.

                                       5
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         (i) If the Guarantor shall liquidate, dissolve or terminate its
     existence or any change occurs in the management or control of the
     Guarantor without the prior written consent of the Lender.

     Section 1.7  Rescission of Election to Accelerate.
                  -------------------------------------

     In the event the Lender shall elect to accelerate the maturity of any
promissory note evidencing all or any part of the Obligations as to the
Guarantor pursuant to the provisions of this Agreement, such election may be
rescinded by written acknowledgment to that effect by the Lender; provided,
however, that the acceptance of a partial payment on account of any promissory
note evidencing all or any part of the Obligations shall not alone effect or
rescind such election.

     Section 1.8  Subordination; Subrogation.
                  ---------------------------

     In the event the Guarantor shall advance any sums to the Borrower, or in
the event the Borrower has heretofore or shall hereafter become indebted to the
Guarantor before the Obligations have been paid in full, all such advances and
indebtedness shall be subordinate in all respects to the Obligations (the
"Guarantor Subordinated Debt").  Any payment to the Guarantor on account of the
Guarantor Subordinated Debt shall be collected and received by the Lender or the
Guarantor in trust for the Lender and shall be paid over to the Lender on
account of the Obligations without impairing or releasing the obligations of the
Guarantor hereunder.

     Without the prior written consent of the Lender, the Guarantor shall not
ask, demand, receive, accept, sue for, set off, collect or enforce the Guarantor
Subordinated Debt or any collateral and security therefor.  The Guarantor
represents and warrants to the Lender that the Guarantor Subordinated Debt is
unsecured and agrees not to receive or accept any collateral or security
therefor without the prior written permission of the Lender.  The Guarantor
shall not assign, transfer, hypothecate or dispose of the Guarantor Subordinated
Debt while this Agreement is in effect.  In the event of any sale, receivership,
insolvency or bankruptcy proceeding, or assignment for the benefit of creditors,
or any proceeding by or against the Borrower for any relief under any bankruptcy
or insolvency law or other laws relating to the relief of debtors, readjustment
of indebtedness, reorganizations, compositions or extensions, then and in any
such event any payment or distribution of any kind or character, either in cash,
securities or other property, which shall be payable or deliverable upon, or
with respect to, all or any part of the Guarantor Subordinated Debt or otherwise
shall be paid or delivered directly to the Lender for application to the
obligations and liabilities of the Guarantor under this Agreement (whether due
or not due and in such order and manner as the Lender may determine in the
exercise of its sole discretion) until the obligations of the Guarantor
hereunder shall have been fully paid and satisfied.  The Guarantor hereby
irrevocably authorizes and empowers the Lender to demand, sue for, collect and
receive every such payment or distribution on account of the Guarantor
Subordinated Debt and give acquittance therefor and to file claims and take such
other proceedings in the Lender's own name or in the name of the Guarantor or
otherwise, as the Lender may deem necessary or advisable to carry out the
provisions of this Agreement.  The Guarantor hereby agrees to execute and
deliver to the Lender such powers of attorney, assignments, endorsements or
other instruments as may be requested by the Lender in order to enable the
Lender to enforce any and all claims upon, or with respect to, the Guarantor

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Subordinated Debt, and to collect and receive any and all payments or
distributions which may be payable or deliverable at any time upon or with
respect thereto.

     So as to secure the performance by the Guarantor of the provisions of this
Agreement, the Guarantor assigns, pledges and grants to the Lender a security
interest in, and lien on, the Guarantor Subordinated Debt, all proceeds thereof
and all and any security and collateral therefor.  Upon the request of the
Lender, the Guarantor shall endorse, assign and deliver to the Lender all notes,
instruments and agreements evidencing, securing, guarantying or made in
connection with the Guarantor Subordinated Debt.

     Nothing contained in this Agreement shall be construed to give the
Guarantor any right of subrogation in or to the Obligations or any of the
Financing Documents, or all or any part of the interest of the Lender therein,
until the Obligations have been paid in full.

     Section 1.9  Arbitration and Waiver of Jury Trial.
                  -------------------------------------
         (a) This paragraph concerns the resolution of any controversies or
claims between the Borrower and the Lender, whether arising in contract, tort or
by statute, including but not limited to controversies or claims that arise out
of or relate to: (i) this Agreement (including any renewals, extensions or
modifications); or (ii) any document related to this Agreement; (collectively a
"Claim").

         (b) At the request of the Borrower or the Lender, any Claim shall be
resolved by binding arbitration in accordance with the Federal Arbitration Act
(Title 9, U. S. Code) (the "Act"). The Act will apply even though this Agreement
provides that it is governed by the law of a specified state.

         (c) Arbitration proceedings will be determined in accordance with the
Act, the rules and procedures for the arbitration of financial services disputes
of J.A.M.S./Endispute or any successor thereof ("J.A.M.S."), and the terms of
this paragraph. In the event of any inconsistency, the terms of this paragraph
shall control.

         (d) The arbitration shall be administered by J.A.M.S. and conducted in
any U. S. state where real or tangible personal property collateral for this
credit is located or if there is no such collateral, in the Commonwealth of
Virginia. All Claims shall be determined by one arbitrator; however, if Claims
exceed $5,000,000, upon the request of any party, the Claims shall be decided by
three arbitrators. All arbitration hearings shall commence within 90 days of the
demand for arbitration and close within 90 days of commencement and the award of
the arbitrator(s) shall be issued within 30 days of the close of the hearing.
However, the arbitrator(s), upon a showing of good cause, may extend the
commencement of the hearing for up to an additional 60 days. The arbitrator(s)
shall provide a concise written statement of reasons for the award. The
arbitration award may be submitted to any court having jurisdiction to be
confirmed and enforced.

         (e) The arbitrator(s) will have the authority to decide whether any
Claim is barred by the statute of limitations and, if so, to dismiss the
arbitration on that basis. For purposes of the application of the statute of
limitations, the service on J.A.M.S. under applicable J.A.M.S. rules of a notice
of Claim is the equivalent of the filing of a lawsuit. Any dispute

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concerning this arbitration provision or whether a Claim is arbitrable shall be
determined by the arbitrator(s). The arbitrator(s) shall have the power to award
legal fees pursuant to the terms of this Agreement.

         (f) This paragraph does not limit the right of the Borrower or the
Lender to: (i) exercise self-help remedies, such as but not limited to, setoff;
(ii) initiate judicial or nonjudicial foreclosure against any real or personal
property collateral; (iii) exercise any judicial or power of sale rights, or
(iv) act in a court of law to obtain an interim remedy, such as but not limited
to, injunctive relief, writ of possession or appointment of a receiver, or
additional or supplementary remedies.

         (g) By agreeing to binding arbitration, the parties irrevocably and
voluntarily waive any right they may have to a trial by jury in respect of any
Claim. Furthermore, without intending in any way to limit this Agreement to
arbitrate, to the extent any Claim is not arbitrated, the parties irrevocably
and voluntarily waive any right they may have to a trial by jury in respect of
such Claim. This provision is a material inducement for the parties entering
into this Agreement.

                                  ARTICLE II
                         REPRESENTATIONS AND WARRANTIES
                         ------------------------------

     Section 2.1  Representations and Warranties.
                  -------------------------------

     The Guarantor represents and warrants to the Lender as follows:

                  2.1.1  Good Standing.
                         --------------

                  The Guarantor (a) is a corporation duly organized, existing
and in good standing under the laws of the jurisdiction of its organization, (b)
has the power to own its property and to carry on its business as now being
conducted, and (c) is duly qualified to do business and is in good standing in
each jurisdiction in which the character of the properties owned by it therein
or in which the transaction of its business makes such qualification necessary.

                  2.1.2  Power and Authority.
                         --------------------

                  The Guarantor has full power and authority to execute and
deliver this Agreement and the other Financing Documents to which it is a party
and to incur and perform the Obligations whether under this Agreement, the other
Financing Documents or otherwise, all of which have been duly authorized by all
proper and necessary action under the governing documents of the Guarantor. No
consent or approval of owners or any creditors of the Guarantor, and no consent,
approval, filing or registration with or notice to any Governmental Authority on
the part of the Guarantor, is required as a condition to the execution,
delivery, validity or enforceability of this Agreement or the other Financing
Documents or the performance by the Guarantor of the Obligations.

                                       8
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                  2.1.3  Binding Agreements.
                         -------------------

                  This Agreement and the other Financing Documents executed and
delivered by the Guarantor have been properly executed and delivered and
constitute the valid and legally binding obligations of the Guarantor and are
fully enforceable against the Guarantor in accordance with their respective
terms.

                  2.1.4  No Conflicts.
                         -------------

                  Neither the execution, delivery and performance of the terms
of this Agreement or of any of the other Financing Documents executed and
delivered by the Guarantor nor the consummation of the transactions contemplated
by this Agreement will conflict with, violate or be prevented by (a) the
Guarantor's charter or bylaws, (b) any existing mortgage, indenture, contract or
agreement binding on the Guarantor or affecting its property, or (c) any Laws.

                  2.1.5  Compliance with Laws.
                         ---------------------

                  The Guarantor is not in violation of any applicable Laws
(including, without limitation, any Laws relating to employment practices, to
environmental, occupational and health standards and controls) or order, writ,
injunction, decree or demand of any court, arbitrator or any Governmental
Authority affecting the Guarantor or any of its properties, the violation of
which, considered in the aggregate, could materially adversely affect the
business, operations or properties of the Guarantor.

                  2.1.6  Litigation.
                         -----------

                  There are no proceedings, actions or investigations pending
or, so far as the Guarantor knows, threatened before or by any court, arbitrator
or any Governmental Authority which, in any one case or in the aggregate, if
determined adversely to the interests of the Guarantor, would have a material
adverse effect on the business, properties, condition (financial or otherwise)
or operations, present or prospective, of the Guarantor.

                  2.1.7  Financial Condition.
                         --------------------

                  The financial statements of the Guarantor dated September 30,
2000, are complete and correct and fairly present the financial position of the
Guarantor and the results of its operations and transactions in its surplus
accounts as of the date and for the period referred to and have been prepared in
accordance with GAAP applied on a consistent basis throughout the period
involved. There are no liabilities, direct or indirect, fixed or contingent, of
the Guarantor as of the date of such financial statements that are not reflected
therein or in the notes thereto. There has been no adverse change in the
financial condition or operations of the Guarantor since the date of such
financial statements and to the Guarantor's knowledge no such adverse change is
pending or threatened. The Guarantor has not guaranteed the obligations of, or
made any investment in or advances to, any Person, except as disclosed in such
financial statements. The representations and warranties contained in this
Section shall also cover financial statements furnished from time to time to the
Lender pursuant to Section 3.3 (Financial Records; Inspection).

                                       9
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                  2.1.8  Full Disclosure.
                         ----------------

                  The financial statements referred to in Section 2.1.9
(Financial Condition), the Financing Documents (including, without limitation,
this Agreement), and the statements, reports or certificates furnished by the
Guarantor in connection with the Financing Documents (a) do not contain any
untrue statement of a material fact and (b) when taken in their entirety, do not
omit any material fact necessary to make the statements contained therein not
misleading. There is no fact known to the Guarantor which the Guarantor has not
disclosed to the Lender in writing prior to the date of this Agreement which
materially and adversely affects or in the future could, in the reasonable
opinion of the Guarantor materially adversely affect the condition, financial or
other wise, results of operations, business, or assets of the Guarantor.

                  2.1.9  Financial Interest.
                         -------------------

                  The Guarantor has a financial interest in the Borrower and
will derive a benefit from the Loan extended to and the Obligations incurred by
the Borrower, and hereby waives any claim that the Lender violated the Equal
Credit Opportunity Act (15 U.S.C. 1691 et seq.) in connection with the Loan, any
of the Financing Documents or any of the other Obligations or security for any
obligation which is the subject thereto.

     Section 2.2  Survival; Updates of Representations and Warranties.
                  ----------------------------------------------------

     All representations and warranties contained in or made under or in
connection with this Agreement and the other Financing Documents shall survive
the Closing Date, the making of any advance under the Financing Agreement and
the incurring of any Obligations.

                                  ARTICLE III
                             AFFIRMATIVE COVENANTS
                             ---------------------

     The Guarantor hereby covenants and agrees as follows:

     Section 3.1  Existence.
                  ----------

     The Guarantor shall maintain its existence in good standing in the
jurisdiction in which it is organized and in each other jurisdiction where it is
required to register or qualify to do business if the failure to do so in such
other jurisdiction might have a material adverse effect on the ability of the
Guarantor to perform the Obligations, on the conduct of the Guarantor's
operations or on the Guarantor's financial condition.

     Section 3.2  Further Assurances.
                  -------------------

     The Guarantor will make, execute, acknowledge and deliver all and every
such further acts and assurances as the Lender shall from time to time require
for confirming or carrying out the intentions or facilitating the performance of
the terms of this Agreement.

     Section 3.3  Financial Records; Inspection.
                  ------------------------------

     The Guarantor will (a) maintain or cause to be maintained full, complete,
accurate and adequate records and books of account in accordance with generally
accepted accounting principles consistently applied; (b) permit the Lender and
its duly authorized agents, attorneys

                                      10
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and accountants to inspect, examine, and copy its records and books of account
at all reasonable times; (c) provide to the Lender within ninety (90) days after
each calendar/fiscal year end, the Guarantor's financial statements certified by
the Guarantor to be true and correct, in such form and detail as may be
reasonably requested by the Lender; and (d) promptly deliver to the Lender such
other information with respect to the financial statements of the Guarantor as
the Lender may from time to time require.

     Section 3.4  Estoppel Certificates.
                  ----------------------

     Within ten (10) days following any request of the Lender so to do, the
Guarantor will furnish the Lender and such other persons as the Lender may
direct with a written certificate, duly acknowledged stating in detail whether
or not any credits, offsets or defenses exist with respect to this Agreement.

                                  ARTICLE IV
                                 MISCELLANEOUS
                                 -------------

     Section 4.1  Notices.
                  --------

     All notices, requests and demands to or upon the parties to this Agreement
shall be in writing and shall be deemed to have been given or made when
delivered by hand on a Business Day, or two (2) days after the date when
deposited in the mail, postage prepaid by registered or certified mail, return
receipt requested, or when sent by overnight courier, on the Business Day next
following the day on which the notice is delivered to such overnight courier,
addressed as follows:

          Guarantor:     Trex Company, Inc.
                         ___________________________
                         ___________________________
                         Attention:  _______________

          Lender:        Bank of America, N. A.
                         8600 Greensboro Drive, Suite 550
                         McLean, Virginia 22102
                         Attention:  Elaine Eaton

     By written notice, each party to this Agreement may change the address to
which notice is given to that party, provided that such changed notice shall
include a street address to which notices may be delivered by overnight courier
in the ordinary course on any Business Day.

     Section 4.2  Amendments; Waivers.
                  --------------------

     This Agreement may not be amended, modified, or changed in any respect
except by an agreement in writing signed by the Lender and the Guarantor.  No
waiver of any provision of this Agreement, nor consent to any departure by the
Guarantor therefrom, shall in any event be effective unless the same shall be in
writing.  No course of dealing between the Guarantor and the Lender and no act
or failure to act from time to time on the part of the Lender shall constitute

                                      11
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a waiver, amendment or modification of any provision of this Agreement or any
right or remedy under this Agreement or under applicable Laws.

     Without implying any limitation on the foregoing:

         (a) Any waiver or consent shall be effective only in the specific
     instance, for the terms and purpose for which given, subject to such
     conditions as the Lender may specify in any such instrument.

         (b) No waiver of any Default or Event of Default shall extend to any
     subsequent or other Default or Event of Default, or impair any right
     consequent thereto.

         (c) No notice to or demand on the Guarantor in any case shall entitle
     the Guarantor to any other or further notice or demand in the same, similar
     or other circumstance.

         (d) No failure or delay by the Lender to insist upon the strict
     performance of any term, condition, covenant or agreement of this Agreement
     or of any of the other Financing Documents, or to exercise any right, power
     or remedy consequent upon a breach thereof, shall constitute a waiver,
     amendment or modification of any such term, condition, covenant or
     agreement or of any such breach or preclude the Lender from exercising any
     such right, power or remedy at any time or times.

         (e) By accepting payment after the due date of any amount payable under
     this Agreement or under any of the other Financing Documents, the Lender
     shall not be deemed to waive the right either to require prompt payment
     when due of all other amounts payable under this Agreement or under any of
     the other Financing Documents, or to declare a default for failure to
     effect such prompt payment of any such other amount.

     Section 4.3  Cumulative Remedies.
                  --------------------

     The rights, powers and remedies provided in this Agreement and in the other
Financing Documents are cumulative, may be exercised concurrently or separately,
may be exercised from time to time and in such order as the Lender shall
determine and are in addition to, and not exclusive of, rights, powers and
remedies provided by existing or future applicable Laws.  In order to entitle
the Lender to exercise any remedy reserved to it in this Agreement, it shall not
be necessary to give any notice, other than such notice as may be expressly
required in this Agreement.  Without limiting the generality of the foregoing,
the Lender may:

         (a) proceed against the Guarantor with or without proceeding against
     the Borrower or any other Person who may be liable for all or any part of
     the Obligations;

                                      12
<PAGE>

         (b) proceed against the Guarantor with or without proceeding under any
     of the other Financing Documents or against any collateral and security for
     all or any part of the Obligations;

         (c) without reducing or impairing the obligation of the Guarantor and
     without notice, release or compromise with any other Person liable for all
     or any part of the Obligations under the Financing Documents or otherwise;
     or

         (d) without reducing or impairing the obligations of the Guarantor and
     without notice thereof: (i) fail to perfect the Lien in any or all
     collateral or to release any or all the collateral or to accept substitute
     collateral, (ii) approve the making of advances under the credit facilities
     under the Financing Agreement, (iii) waive any provision of this Agreement
     or the other Financing Documents, (iv) exercise or fail to exercise rights
     of set-off or other rights, or (v) accept partial payments or extend from
     time to time the maturity of all or any part of the Obligations.

     Section 4.4  Severability.
                  -------------

     In case one or more provisions, or part thereof, contained in this
Agreement or in the other Financing Documents shall be invalid, illegal or
unenforceable in any respect under any Law, then without need for any further
agreement, notice or action:

         (a)  the validity, legality and enforceability of the remaining
     provisions shall remain effective and binding on the parties thereto and
     shall not be affected or impaired thereby;

         (b)  the obligation to be fulfilled shall be reduced to the limit of
     such validity;

         (c)  if such provision or part thereof pertains to repayment of the
     Obligations, then, at the sole and absolute discretion of the Lender, all
     of the Obligations shall become immediately due and payable; and

         (d)  if the affected provision or part thereof does not pertain to
     repayment of the Obligations, but operates or would prospectively operate
     to invalidate this Agreement in whole or in part, then such provision or
     part thereof only shall be void, and the remainder of this Agreement shall
     remain operative and in full force and effect.

     Section 4.5  Assignments by Lender.
                  ----------------------

     The Lender may, without notice to, or consent of, the Guarantor, sell,
assign or transfer to or participate with any Person or Persons all or any part
of the Obligations, and each such Person or Persons shall have the right to
enforce the provisions of this Agreement and any of the other Financing
Documents as fully as the Lender, provided that the Lender shall continue to
have the unimpaired right to enforce the provisions of this Agreement and any of
the other Financing Documents as to so much of the Obligations that the Lender
has not sold, assigned or transferred.

                                      13
<PAGE>

In connection with the foregoing, the Lender shall have the right to disclose to
any such actual or potential purchaser, assignee, transferee or participant all
financial records, information, reports, financial statements and documents
obtained in connection with this Agreement and any of the other Financing
Documents or otherwise.

     Section 4.6  Successors and Assigns.
                  -----------------------

     This Agreement shall be binding upon the Guarantor and its successors and
assigns, and shall inure to the benefit of the Lender and its successors and
assigns.

     Section 4.7  Continuing Agreements.
                  ----------------------

     All covenants, agreements, representations and warranties made by the
Guarantor in this Agreement and in any certificate delivered pursuant hereto
shall survive the making by the Lender of advances and other extensions of
credit under the Loan and the execution and delivery of each promissory note
evidencing all or any part of the Obligations, shall be binding upon the
Guarantor regardless of how long before or after the date hereof any of the
Obligations were or are incurred, and shall continue in full force and effect so
long as any of the Obligations are outstanding and unpaid.  From time to time
upon the Lender's request, and as a condition of the release of any one or more
of the Security Documents, the Guarantor and other Persons obligated with
respect to the Obligations shall provide the Lender with such acknowledgments
and agreements as the Lender may require to the effect that there exists no
defenses, rights of setoff or recoupment, claims, counterclaims, actions or
causes of action of any kind or nature whatsoever against the Lender, its agents
and others, or to the extent there are, the same are waived and released.

     Section 4.8  Enforcement Costs.
                  ------------------

     The Guarantor agrees to pay to the Lender on demand all reasonable
Enforcement Costs, together with interest thereon from the date incurred or
advanced until paid in full at a per annum rate of interest equal at all times
to the Post -Default Rate.  Enforcement Costs shall be immediately due and
payable at the time advanced or incurred, whichever is earlier.  Without
implying any limitation on the foregoing, the Guarantor agrees, as part of the
Enforcement Costs, to pay upon demand any and all stamp and other Taxes and fees
payable or determined to be payable in connection with the execution and
delivery of this Agreement and to save the Lender harmless from and against any
and all liabilities with respect to or resulting from any delay in paying or
omission to pay any Taxes or fees referred to in this Section.  The provisions
of this Section shall survive the execution and delivery of this Agreement, the
repayment of the other Obligations and shall survive the termination of this
Agreement.

     Section 4.9  Applicable Law.
                  ---------------

     As a material inducement to the Lender to enter into this Agreement, the
Guarantor acknowledges and agrees that the Financing Documents, including, this
Agreement, shall be governed by the Laws of the Commonwealth of Virginia, as if
each of the Financing Documents and this Agreement had each been executed,
delivered, administered and performed solely within the Commonwealth of Virginia
even though for the convenience and at the request of the Borrower, one or more
of the Financing Documents may be executed elsewhere.  The Lender acknowledges,
however, that remedies under certain of the Financing Documents that relate to

                                      14
<PAGE>

property outside the Commonwealth of Virginia may be subject to the laws of the
state in which the property is located.

     Section 4.10  Duplicate Originals and Counterparts.
                   -------------------------------------

     This Agreement may be executed in any number of duplicate originals or
counterparts, each of such duplicate originals or counterparts shall be deemed
to be an original and all taken together shall constitute but one and the same
instrument.

     Section 4.11  Headings; Etc.
                   --------------

     The headings in this Agreement are included herein for convenience only,
shall not constitute a part of this Agreement for any other purpose, and shall
not be deemed to affect the meaning or construction of any of the provisions
hereof.  The above Recitals are part of this Agreement.

     Section 4.12  No Partnership; Third Parties.
                   ------------------------------

     Nothing contained in this Agreement shall be construed in a manner to
create any relationship between the Guarantor and the Lender other than the
relationship of guarantor and lender and the Guarantor and the Lender shall not
be considered partners or co-venturers for any purpose.  The terms and
provisions of this Agreement are for the benefit of the Lender and its
successors, assigns, endorsees and transferees and all persons claiming under or
through it and no other person shall have any right or cause of action on
account thereof.  The Lender has no obligation to make any advance of any loan
provided for in the Financing Agreement or otherwise for the benefit of the
Guarantor; the Guarantor has no beneficial interest in the proceeds of any of
the loans or otherwise under the Obligations or rights or claims under the
Financing Agreement or any of the other Financing Documents.  The obligations
and liabilities of the Guarantor shall in no manner be affected by the actual
use of the proceeds of the Loan or otherwise or whether the Lender waives any or
all of the conditions to advances set forth in the Financing Agreement or any of
the other Financing Documents.

     Section 4.13  Entire Agreement.
                   -----------------

     This Agreement is intended by the Lender and the Guarantor to be a
complete, exclusive and final expression of the agreements contained herein.
Neither the Lender nor the Guarantor shall hereafter have any rights under any
prior agreements pertaining to the matters addressed by this Agreement but shall
look solely to this Agreement for definition and determination of all of their
respective rights, liabilities and responsibilities under this Agreement.

     Section 4.14  Consent to Jurisdiction.
                   ------------------------

     The Guarantor, irrevocably submits to the jurisdiction of any state or
federal court sitting in the Commonwealth of Virginia over any suit, action, or
proceeding arising out of or relating to this Agreement.  The Guarantor
irrevocably waives, to the fullest extent permitted by law, any objection that
it may now or hereafter have to laying the venue of any such suit, action, or
proceeding brought in any such court and any claim that any such suit, action,
or proceeding brought in any such court has been brought in an inconvenient
forum.  Final judgment in any such suit, action, or proceeding brought in any
such court shall be conclusive and binding upon the Guarantor and may be
enforced in any court to the jurisdiction of which the Guarantor is

                                      15
<PAGE>

subject, by a suit upon such judgment provided that service of process is
effected upon the Guarantor in a manner specified in this Agreement or as
otherwise permitted by applicable law.

     Section 4.15  WAIVER OF TRIAL BY JURY.
                   ------------------------

     THE GUARANTOR AND THE LENDER HEREBY JOINTLY AND SEVERALLY WAIVE TRIAL BY
JURY IN ANY ACTION OR PROCEEDING TO WHICH THE GUARANTOR AND THE LENDER MAY BE
PARTIES, ARISING OUT OF OR IN ANY WAY PERTAINING TO (A) THIS AGREEMENT, (B) ANY
OF THE FINANCING DOCUMENTS, OR (C) THE COLLA TERAL.  THIS WAIVER CONSTITUTES A
WAIVER OF TRIAL BY JURY OF ALL CLAIMS AGAINST ALL PARTIES TO SUCH ACTIONS OR PRO
CEEDINGS, INCLUDING CLAIMS AGAINST PARTIES WHO ARE NOT PARTIES TO THIS
AGREEMENT.

     This waiver is knowingly, willingly and voluntarily made by the Guarantor
and the Lender, and the Guarantor and the Lender hereby represent that no
representations of fact or opinion have been made by any individual to induce
this waiver of trial by jury or to in any way modify or nullify its effect.  The
Guarantor and the Lender further represent that they have been represented in
the signing of this Agreement and in the making of this waiver by independent
legal counsel, selected of their own free will, and that they have had the
opportunity to discuss this waiver with counsel.

     Section 4.16  Reinstatement.
                   --------------

     If at any time any payment, or portion thereof, made by, or for the account
of, the Borrower or the Guarantor on account of any of the obligations and
liabilities arising hereunder or under any of the Financing Documents is set
aside by any court or trustee having jurisdiction as a voidable preference or
fraudulent conveyance or must otherwise be restored or returned by the Lender to
the Borrower or to the Guarantor under any insolvency, bankruptcy or other
federal and/or state laws or as a result of any dissolution, liquidation or
reorganization of the Borrower or upon, or as a result of, the appointment of
any receiver, intervenor or conservator of, or trustee, or similar officer for,
the Borrower or any substantial part of its properties or assets, the Guarantor
hereby agrees that this Agreement shall continue and remain in full force and
effect or be reinstated, as the case may be, all as though such payment(s) had
not been made.

     Section 4.17  Complete and Final Expression of Agreement.
                   -------------------------------------------

     This Agreement is intended by the Lender and the Guarantor to be a
complete, exclusive and final expression of the agreements contained herein.  No
course of dealing, course of performance or trade usage, and no parol evidence
of any nature, shall be used to supplement or modify any terms of this
Agreement.  The Lender and the Guarantor further agree that there are no
conditions to the full effectiveness of this Agreement, unless otherwise
expressly stated herein.  The Guarantor has unconditionally delivered this
Agreement to the Lender, and failure to sign this or any other guarantee by any
other person shall not discharge the liability of the Guarantor hereunder.

                                      16
<PAGE>

     WITNESS the signature and seal of the Guarantor as of the day and year
first above written.

                                      TREX COMPANY, INC.

                                      By: /s/ Anthony J. Cavanna        (SEAL)
                                         ------------------------------
                                         Name:  Anthony J. Cavanna
                                         Title: Chief Financial Officer

                                      17<PAGE>

                                                                   EXHIBIT 10.16

                                                 Adams-Nelson & Associates, Inc.
                                                              Full Service Lease

================================================================================

                                 DEED OF LEASE

                                    BETWEEN

                                  SPACE, LLC

                                      AND

                              TREX COMPANY, LLC,
                                   as Tenant

                            Dated:   June 15, 2000

================================================================================

                           For Premises Located At:

                         Trex Center Office Building 1
                             Winchester, Virginia
<PAGE>

                               TABLE OF CONTENTS
                               -----------------

<TABLE>
<CAPTION>

                                                                    Page
------------------------------------------------------------------- ----
<S>                                                                 <C>
ARTICLE 1:   BASIC LEASE PROVISIONS................................   1
ARTICLE 2:   DEFINITIONS...........................................   2
ARTICLE 3:   THE PREMISES..........................................   4
ARTICLE 4:   TERM..................................................   5
ARTICLE 5:   RENT..................................................   5
ARTICLE 6:   SECURITY DEPOSIT......................................   6
ARTICLE 7:   OPERATING EXPENSES....................................   6
ARTICLE 8:   TAXES.................................................   9
ARTICLE 9:   PARKING...............................................   10
ARTICLE 10:  USE...................................................   10
ARTICLE 11:  ASSIGNMENT AND SUBLETTING.............................   11
ARTICLE 12:  MAINTENANCE AND REPAIR................................   11
ARTICLE 13:  INITIAL CONSTRUCTION; ALTERATIONS.....................   13
ARTICLE 14:  SIGNS.................................................   14
ARTICLE 15:  TENANT'S EQUIPMENT AND PROPERTY.......................   14
ARTICLE 16:  RIGHT OF ENTRY........................................   15
ARTICLE 17:  INSURANCE.............................................   15
ARTICLE 18:  LANDLORD SERVICES AND UTILITIES.......................   17
ARTICLE 19:  LIABILITY OF LANDLORD.................................   18
ARTICLE 20:  RULES AND REGULATIONS.................................   18
ARTICLE 21:  DAMAGE; CONDEMNATION..................................   19
ARTICLE 22:  DEFAULT...............................................   20
ARTICLE 23:  MORTGAGES.............................................   22
ARTICLE 24:  SURRENDER; HOLDING OVER...............................   23
ARTICLE 25:  QUIET ENJOYMENT.......................................   23
ARTICLE 26:  TENANT'S COVENANTS REGARDING HAZARDOUS MATERIALS......   24
ARTICLE 27:  MISCELLANEOUS.........................................   25
</TABLE>

                               LIST OF EXHIBITS
                               ----------------

Exhibit A-1  Plan Showing Premises
Exhibit A-2  Plat Showing Land and Building
Exhibit B    Rules and Regulations
Exhibit C    Guaranty of Lease
Exhibit D    Lease Commencement Certificate
Exhibit E    Prohibited Uses
Exhibit F    Work Agreement
Exhibit G    Covenants and Restrictions
Exhibit H    Subordination, Non-Disturbance and Attornment Agreement
<PAGE>

                                 DEED OF LEASE

     THIS DEED OF LEASE (:Lease:) is made as of the 15th day of June, 2000 (the
"Date of Lease"), by and between Space, LLC ("Landlord"), and Trex Company, LLC
("Tenant").

     Landlord and Tenant, intending legally to be bound, hereby covenant and
agree as set forth below.

ARTICLE 1:  BASIC LEASE PROVISIONS

     The following terms, when used herein, shall have the meanings set forth
below.

     1.1  Premises.  Approximately 35,928 rentable square feet, known as Suites
          --------
          300 & 400 and located on the top two (2) floors of the Building as
          outlined on Exhibit A-1 attached hereto and made a part hereof, which
                      -----------
          square footage is subject to confirmation by Tenant's architect.

     1.2  Building.  The building containing approximately 60,000 gross rentable
          --------
          square feet shown on Exhibit A-1 attached hereto and made a part
                               -----------
          hereof, and all Alterations, additions, improvements, restorations or
          replacements now or hereafter made thereto, with an address of 1460
          North Frederick Pike, Winchester, Virginia.

     1.3  Term.  10 years, 0 months and 0 days plus any exercised renewal
          ----
          periods.

     1.4  Commencement Date.  As set forth in Article 4.
          -----------------

     1.5  Expiration Date.  Ten (10) Lease Years after the Commencement Date.
          ---------------

     1.6  Fixed Rent.  $21.50 for each rentable square foot of the Premises for
          ----------
          the first through the  third Lease Year which is equal to a total of
          $772,452 for each of the first three (3) Lease Years payable in equal
          monthly installments of $64,371.  The Fixed Rent shall be increased
          annually by an amount equal to two and one half percent (2-1/2%) of
          the previous Lease Year's Fixed Rent commencing with the fourth Lease
          Year.

          For the purposes of this full-service lease, $15.69 has been
          attributed to the base rent and $5.81 per rentable square foot per
          annum has been allowed for operating costs. The Landlord will perform
          an operating costs reconciliation each January 1st beginning with the
          first full year of operation.  Operating costs are estimated to be
          $5.21 per rentable square foot of the Premises per annum.  The Tenant
          shall be due 50% of operating costs savings for each Calendar Year, if
          any, which shall be the difference between allocated operating costs,
          $5.81 per rentable square foot per annum, and actual per rentable
          square foot operating costs per annum.  Example: If reconciled
          operating costs are $5.50 per rentable square foot of the Premises per
          annum, then Tenant shall be due a rebate of 50%, the difference
          between $5.81 and $5.50 or $.155 per rentable square foot per year
          which shall be paid by Landlord to Tenant within thirty (30) days
          after the operating expense reconciliation.

     1.7  Intentionally Deleted.
          ---------------------
<PAGE>

     1.8  Intentionally Deleted.
          ---------------------

     1.9  Intentionally Deleted.
          ---------------------

     1.10 Intentionally Deleted.
          ---------------------

     1.11 Intentionally Deleted.
          ---------------------

     1.12 Business Hours. Utilities pursuant to Section 18.1(i) are furnished
          --------------
          for Tenant's normal business operations.  Under no circumstances will
          HVAC or other utilities, including but not limited to electricity,
          water, etc. be turned off unless necessary for repairs.

     1.13 Parking Space Allocation.  Not more than Tenant's proportionate share
          ------------------------
          of available parking spaces, which shall be in unreserved, non-
          exclusive parking spaces available in the Parking Facilities.

     1.14 Permitted Use.  Any lawful purpose. The Permitted Use shall be deemed
          -------------
          to expressly include but not be limited to any use of any other
          occupant of the Building as allowed from time to time.

     1.15 Intentionally Deleted.
          ---------------------

     1.16 Broker(s).  None.
          ---------

     1.17 Landlord's Address. Kevin Adams, The Adams Companies, The Fern Adams
          ------------------
          Building, 303 S. Loudoun Street, Winchester, VA 22601, with a copy to
          Thomas Moore Lawson, Lawson and Silek, P.L.C., P.O. Box 2740,
          Winchester, VA 22604

     1.18 Tenant's Address.  Before occupancy: 20 South Cameron Street,
          ----------------
          Winchester, Virginia; after occupancy: at the Premises; either with a
          copy to Hirschel, Savitz, Parker & Hollman, Attn: Steve Levey, 481
          North Frederick Avenue, Suite 200, Gaithersburg, MD 20877.

     1.19 Guarantor and Guarantor' Address.  Trex Company, Inc. Before
          --------------------------------
          occupancy: 20 S. Cameron Street, Winchester, Virginia; after
          occupancy: at the Premises; either with a copy to Hirschel, Savitz,
          Parker & Hollman, Attn: Steve Levey, 481 North Frederick Avenue, Suite
          200, Gaithersburg, MD 20877.

ARTICLE 2:  DEFINITIONS

     The following terms, when used herein, shall have the meanings set forth
below.

     2.1  Additional Rent.  As defined in Section 5.3.
          ---------------

     2.2  Agents.  Officers, partners, directors, employees, agents, licensees,
          ------
          customers, contractors, and invitees.

     2.3  Alterations.  Alterations, decorations, additions or improvements of
          -----------
          any kind or nature to the Premises or the Building, whether structural
          or non-structural, interior, exterior or

                                      -2-
<PAGE>

           otherwise.

     2.4  Calendar Year.  A period of twelve (12) months commencing on each
          -------------
          January 1 during the Term, except that the first Calendar Year shall
          be that period from and including the Commencement Date through
          December 31 of that same year, and the last Calendar Year shall be
          that period from and including the last January 1 of the Term through
          the earlier of the Expiration Date or date of Lease termination.

     2.5  Common Area.  All areas, improvements, facilities and equipment in the
          -----------
          Building outside of any tenant's premises and within the area
          designated as the Common Area Envelope on Exhibit A-2, from time to
                                                    -----------
          time designated by Landlord for the common use or benefit of Tenant,
          other tenants of the Building and their Agents, including, without
          limitation, entrances and exits, landscaped areas, exterior lighting,
          loading areas, pedestrian walk-ways, sidewalks, atriums, courtyards,
          concourses, stairs, ramps, washrooms, maintenance and utility rooms
          and closets, exterior utility lines, hallways, lobbies, elevators and
          their housing and rooms, common window areas, common walls, common
          ceilings, common trash areas and Parking  Facilities.  In no event
          shall the Common Area include areas of the Land allocable to any other
          structures, including but not limited to parking garage, shopping
          centers, theaters, gas stations, hotels or other buildings which are
          not the Building.

     2.6  Guaranty.  The Guaranty of Lease executed by the Guarantor in the form
          --------
          of Exhibit C attached hereto and made a part hereof.
             ---------

     2.7  Event of Default.  As defined in Article 22.
          -----------------

     2.8  Herein, hereafter, hereunder and hereof.  Under this Lease, including,
          ---------------------------------------
          without limitation, all Exhibits and any Riders.

     2.9  Interest Rate.  Per annum interest rate listed as the base rate on
          --------------
          corporate loans at large U. S. money center commercial banks as
          published from time to time under "Money Rates" in the Wall Street
                                                                 -----------
          Journal plus three percent (3%), but in no event greater than the
          -------
          maximum rate permitted by law.  In the event the Wall Street Journal
                                                           -------------------
          ceases to publish such rates, Landlord and Tenant shall choose a
          similar publication which publishes such rates.

     2.10 Land.  The piece or parcel of land described in Exhibit A-2 and all
          ----                                            -----------
          rights, easements and appurtenances thereunto belonging or pertaining,
          or such portion thereof as shall be reasonably allocated by Landlord
          to the Building.

     2.11 Lease Year.  Each consecutive twelve (12) month period elapsing after
          ----------
          (i) the Commencement Date if the Commencement Date occurs on the first
          day of a month, or (ii) the first day of the month following the
          Commencement Date if the Commencement Date does not occur on the first
          day of the month.

     2.12 Mortgage.  Any mortgage, deed of trust, security interest or title
          --------
          retention interest affecting the Building or the Land.

     2.13 Mortgagee.  The holder of any note or obligation secured by a
          ----------
          mortgage, deed of trust, security interest or title retention interest
          affecting the Building or the Land, including,

                                      -3-
<PAGE>

          without limitation, lessors under ground leases, sale-leasebacks and
          lease-leasebacks.

     2.14 Operating Expenses.  As defined in Sections 7.1 and 7.2.
          ------------------

     2.15 Parking Facilities.  All parking areas now or hereafter made available
          ------------------
          by Landlord for use by tenants, including, without limitation, open-
          air parking, and parking areas under or within the Building, whether
          reserved, exclusive, non-exclusive or otherwise.

     2.16 Real Estate Taxes.  As defined in Section 8.2.
          -----------------

     2.17 Rent.  Fixed Rent and Additional Rent.
          ----

     2.18 Rules and Regulations.  The rules and regulations set forth in Exhibit
          ---------------------                                          -------
          B attached hereto and made a part hereof, as the same may be
          -
          reasonably amended or supplemented from time to time (after reasonable
                                                               =================
          notice to Tenant) provided they are uniformly applied to all occupants
          =================
          of the Building.

     2.19 Substantial Completion.  As defined in the Work Agreement attached
          ----------------------
          hereto and made a part hereof as Exhibit F.
                                           ----------

     2.20 Substantial Part.  More than eighty percent (80%) of the rentable
          ----------------
          square feet of the Premises or the Building, as the case may be.

     2.21 Work Agreement.  As set forth in Exhibit F attached hereto and made a
          --------------                   ---------
          part hereof.

ARTICLE 3:  THE PREMISES

     3.1  Lease of Premises.  In consideration of the agreements contained
          -----------------
          herein, Landlord hereby leases the Premises to Tenant, and Tenant
          hereby leases the Premises from Landlord, for the Term and upon the
          terms and conditions hereinafter provided.  As an appurtenance to the
          Premises, Tenant shall have the non-exclusive right, together with
          other tenants of the Building and their Agents, to use the Common
          Area.  Subject to the provisions of this Lease, Landlord shall retain
          absolute domain and control over the Common Area and shall operate and
          maintain the Common Area in such manner as Landlord, in its sole
          discretion, shall determine; provided the Building is maintained as a
          Class A office building and provided such right shall not operate to
          interfere with Tenant's  use of the Premises for the Permitted Use.
          Landlord expressly reserves the right permanently to change, modify or
          eliminate, or temporarily to close, any portion of the Common Area
          provided it does not materially interfere with Tenant's use and
          occupancy of the Premises or the Building.  The Premises are leased
          subject to, and Tenant agrees not to violate, all covenants,
          conditions and restrictions of record which affect the Building as are
          negotiated in good faith between the parties and as are attached
          hereto as Exhibit G.  In no event may Landlord allow the number of
          parking spaces in the Common Area to be diminished.

     3.2  Landlord's Reservations.  In addition to the other rights of Landlord
          -----------------------
          under this Lease, Landlord reserves the right (i) to change the street
          address and/or name of the Building (provided however if Landlord
          changes the name without Tenant's consent, Landlord shall reimburse
          Tenant for all costs incurred in connection therewith, including but
          not

                                      -4-
<PAGE>

          limited to costs of change in stationery, business cards and advising
          Tenant's clients of such change), (ii) to install, erect, use,
          maintain and repair mains, pipes, conduits and other such facilities
          to serve the Building's tenants in and through the Premises, after
          twenty-four (24) hours notice unless in the event of an emergency
          provided the same are located in a place which cannot be seen from
          within the Premises and such installation, maintenance or repair shall
          not interfere with the operation of Tenant's business, (iii) to grant
          to anyone the exclusive right to conduct any particular business or
          undertaking in the Building, provided the same does not restrict
          Tenant's ability to use and occupy the Premises as set forth in this
          Lease, (iv) to establish a condominium regime for the Building, the
          Land and/or the Common Area and to include the Premises therein, so
          long as the same is at no cost to Tenant and that the terms of this
          Lease remain in full force and effect and are unmodified (v) to
          control the use of the roof and exterior walls of the Building for any
          purpose and (vi) to use Tenant's name in promotional materials
          relating to the Building as long as Tenant is a tenant. Landlord may
          exercise any or all of the foregoing rights without being deemed to be
          guilty of an eviction, actual or constructive, or a disturbance or
          interruption of the business of Tenant or Tenant's use or occupancy of
          the Premises provided Landlord's actions are reasonable and do not
          materially interfere with Tenant's business. In no event may Landlord
          lease space in the Building for any of the agreed Prohibited Uses set
          forth on Exhibit E. In the event the exercise of Landlord's rights
          hereunder materially interferes with the operation of Tenant's
          business, all rent shall abate during such period of material
          interference. In the event such interference continues for one hundred
          twenty (120) consecutive days, Tenant may terminate this Lease.

ARTICLE 4:  TERM

     The Term shall commence on the Commencement Date and expire at midnight on
     the Expiration Date.  Except as otherwise set forth in Exhibit F, the
     Commencement Date shall be the later of (a) June 1, 2001 or (b) sixty (60)
     days after the date of Substantial Completion.  The first sixty days are
     intended to be rent free.  Notwithstanding what is stated above, the first
     monthly payment shall be due on the Commencement Date.  The date of
     Substantial Completion shall be the date when (a) the work to be performed
     by Landlord in the Premises in accordance with this Lease shall have been
     substantially completed notwithstanding that certain minor details of
     decoration remain to be performed, the non-completion of which would not
     materially interfere with the Tenant's use of the Premises ("Punch List
     Items"), (b) Landlord has completed the Building so that the same is ready
     for occupancy by tenants, and (c) all areas within the Common Area Envelope
     have been substantially completed but not prior to April 15, 2001.  All
     Punch List Items or work to be performed by Landlord shall be completed by
     Landlord within thirty (30) days.  The Expiration Date shall be adjusted so
     that the period of the Term is not changed.  Promptly after the
     Commencement Date is ascertained, Landlord and Tenant shall execute a
     certificate confirming the Commencement Date which certificate shall be in
     the form of Exhibit D attached hereto and made a part hereof.  Tenant shall
                 ---------
     cause said certificate to be executed on behalf of the Tenant within
     fifteen (15) days of receipt from Landlord.  The Term shall include any
     option periods. Notwithstanding what is stated above, the Landlord shall
     not be responsible for any delays in the delivery of the Premises if said
     delays are caused by the Tenant, its architect or subcontractor(s).

ARTICLE 5:  RENT

                                      -5-
<PAGE>

     5.1  Fixed Rent.  Commencing on the Commencement Date, Tenant shall pay to
          ----------
          Landlord the Fixed Rent as specified in Section 1.6.

     5.2  Payment of Fixed Rent.  Fixed Rent for each Lease Year shall be
          ---------------------
          payable in equal monthly installments, in advance, without demand,
          notice, deduction, offset or counterclaim (except as otherwise
          provided in this Lease), on or before the first day of each and every
          calendar month during the Term prorated for any partial month;  Tenant
          shall pay the Fixed Rent and all Additional Rent, by good check or in
          lawful currency of the United States of America, to Landlord at
          Landlord's Address, or to such other address or in such other manner
          as Landlord from time to time specifies by written notice to Tenant.
          Any payment made by Tenant to Landlord on account of Fixed Rent may be
          credited by Landlord to the payment of any late charges then due and
          payable and to any Fixed Rent or Additional Rent then past due before
          being credited to Fixed Rent currently due.

     5.3  Intentionally Deleted.
          ---------------------

ARTICLE 6:   INTENTIONALLY DELETED

ARTICLE 7:   OPERATING EXPENSES

     7.1  Operating Expenses Defined.  As used herein, the term "Operating
          --------------------------
          Expenses" shall mean all expenses and costs which Landlord incurs
          because of or in connection with the ownership, maintenance,
          management and operation of the Building.  Operating Expenses shall
          include, without limitation, all reasonable actual costs, expenses and
          disbursements incurred or made in connection with the following:

          (i)    Wages and salaries of all on-site management agent, staff,
                 below the level of property manager whether employed by
                 Landlord or the Building's management company, engaged in the
                 operation and maintenance or security of the Building and all
                 costs related to or associated with such employees or the
                 carrying out of their duties, including uniforms and their
                 cleaning, taxes, auto allowances and insurance and benefits
                 (including without limitation, contributions to pension and/or
                 profit sharing plans and vacation or other paid absences);

          (ii)   All supplies and materials, including janitorial and lighting
                 supplies, used directly in the operation and maintenance of the
                 Building, Common Area and Parking Facilities allocable to the
                 Building.

          (iii)  All utilities, including, without limitation, electricity,
                 telephone (including, without limitation, all costs and
                 expenses of telephone service for the sprinkler alarm systems,
                 if any), water, sewer, power, gas heating, lighting and air
                 conditioning for the Building, except to the extent such
                 utilities are chargeable or separately metered to a tenant of
                 the Building;

          (iv)   All insurance purchased by Landlord or the Building's
                 management company relating to the Building and its
                 improvements specifically allocated to the Building and any
                 equipment or other property contained therein or located

                                      -6-
<PAGE>

                 thereon including, without limitation, casualty, liability,
                 rental loss, sprinkler and water damage insurance but not
                 including any deductible for such insurance;

          (v)    All non-structural repairs to the Building (excluding repairs,
                 the cost of which are recoverable by the proceeds of insurance
                 or by Tenant or other third parties other than as part of the
                 Operating Expenses);

          (vi)   All maintenance of the Building, including, without limitation,
                 painting, ice and snow removal, landscaping, groundskeeping and
                 the patching of driveways and parking lots allocable to the
                 Building;

          (vii)  Intentionally Deleted;

          (viii) All commercially reasonable maintenance, operation and service
                 agreements for the Building, and any equipment related thereto,
                 including, without limitation, service and/or maintenance
                 agreements for the sprinkler system in the Building, if any
                 (excluding those chargeable to Tenant or any third parties
                 other than as a part of Operating Expenses);

          (ix)   Accounting and legal fees incurred in connection with the
                 operation and maintenance of the Building or related thereto,
                 to the extent the same actually results in a reduction in
                 Operating Expenses;

          (x)    Intentionally Deleted;

          (xi)   All computer rentals for energy management or security
                 monitoring system used to reduce Operating Expenses, if any;

          (xii)  Any capital improvements made to the Building after the
                 Commencement Date (other than those made for the addition of
                 rentable square footage to the Building or for the sole benefit
                 of a Building tenant pursuant to its Lease), (but only to the
                 extent that such capital improvement actually results in the
                 reduction of Operating Expenses) the cost of which shall be
                 amortized over the useful life of such improvement; and

          (xiii) Intentionally Deleted.

     7.2  Exclusions from Operating Expenses.  Operating Expenses shall not
          ----------------------------------
          include the following:

          (i)    Legal fees, space planners' fees, real estate brokers' leasing
                 commissions and advertising expenses incurred in connection
                 with the original or future leasing of space in the Building;

          (ii)   Costs and expenses of Alterations or improvements of the
                 Premises or the leasehold premises of other individual tenants;

          (iii)  Depreciation, interest and principal payments on mortgages and
                 other debt costs, if any;

                                      -7-
<PAGE>

          (iv)   Costs and expenses associated with the operation of the
                 business of the person or entity which constitutes Landlord as
                 the same are distinguished from the costs of operation of the
                 Building, including accounting and legal matters, costs of
                 defending any lawsuits with any mortgagee (except to the extent
                 the actions of Tenants or any other tenant may be in issue),
                 costs of selling or financing any of Landlord's interest in the
                 Building and outside fees paid in connection with disputes with
                 other tenants;

          (v)    Costs and expenses resulting from the negligence or willful
                 misconduct of Landlord or its Agents to the extent provable by
                 Tenant;

          (vi)   Real Estate Taxes as defined in Section 8.2.

          (vii)  management or administrative fees;

          (viii) Intentionally deleted;

          (ix)   the cost of Landlord's federal, state or local income taxes;

          (x)    the expense of rental payments made by Landlord pursuant to any
                 grant or lease covering any or all of the Building or the Land;

          (xi)   charges or fees for, or taxes on, the furnishing of water,
                 sewer service, gas, fuel, electricity or other utility services
                 to those portions of the Building or the Land which are leased
                 to or occupied by tenants, which are separately metered or
                 submetered;

          (xii)  the cost of providing janitorial or trash removal service to
                 those portions of the Building or the Land which are leased to
                 or occupied by tenants and separately chargeable to such
                 tenants or occupants;

          (xiii) the cost of removing asbestos and all other hazardous
                 substances, if any, located in, on or within the Land, and the
                 costs of complying with all laws, rules, orders and regulations
                 concerning hazardous substances (including asbestos) of all
                 governmental, quasi-governmental or judicial authorities;

          (xiv)  the costs incurred in repairing or replacing the roof or the
                 structural portions of the Building or any building or
                 structure on the Land;

          (xv)   the cost of new construction or renovation of the Building or
                 any building or structure on the Land;

          (xvi)  expenses related to security guards;

          (xvii) expenses incurred solely for the benefit of tenants other than
                 the office tenants of the Building generally;

                                      -8-
<PAGE>

          (xviii) expenses incurred solely for the benefit of any one office
                  tenant unless such expenses are also incurred for all other
                  office tenants of the Building;

          (xix)   the costs of complying with all laws, rules, orders and
                  regulations of all governmental, quasi-governmental or
                  judicial authorities concerning any improvements or
                  Alterations to the Building or the Land unless said costs are
                  incurred for the benefit of all tenants; or

          (xx)    Intentionally Deleted.

     7.3  Reconciliation Statement. For the purposes of this full-service lease,
          ------------------------
          $15.69 has been attributed to the base rent and $5.81 per rentable
          square foot per annum has been allowed for operating costs. The
          Landlord will perform an operating costs reconciliation each January
          1st beginning with the first full year of operation.  Operating costs
          are estimated to be $5.21 per rentable square foot of the Premises per
          annum.  The Tenant shall be due 50% of operating costs savings for
          each Calendar Year, if any, which shall be the difference between
          allocated operating costs, $5.81 per rentable square foot per annum,
          and actual per rentable square foot operating costs per annum.
          Example: If reconciled operating costs are $5.50 per rentable square
          foot of the Premises per annum, then Tenant shall be due a rebate of
          50%, the difference between $5.81 and $5.50 or $.155 per rentable
          square foot per year which shall be paid by Landlord to Tenant within
          thirty (30) days after the operating expense reconciliation.

     7.4  Tenant's Right to Audit.  In the event Tenant shall dispute the amount
          -----------------------
          set forth in Landlord's statement as described in Section 7.4 herein,
          Tenant shall have the right, not later than eighteen (18) months
          following receipt of such statement, to cause Landlord's books and
          records with respect to the preceding Calendar Year to be audited.
          Such audit shall occur upon not less than five (5) days prior written
          notice to Landlord, at Landlord's place of business or the actual
          location of Landlord's books and records if different from Landlord's
          place of business, provided the same is within the continental United
          States during Landlord's normal business hours.  The amounts payable
          under this Section by Landlord to Tenant or by Tenant to Landlord, as
          the case may be, shall be appropriately adjusted on the basis of such
          audit.  If such audit discloses a liability for further refund by
          Landlord to Tenant in excess of five percent (5%) of the payments
          previously made by Tenant for such Calendar Year, the cost of such
          audit shall be borne by Landlord and shall not be considered as an
          Operating Expense for purposes of this Lease; otherwise, the cost of
          such audit shall be borne by Tenant.  Notwithstanding the foregoing,
          in no event shall Landlord's cost for such audit exceed one thousand
          dollars ($1,000.00).

ARTICLE 8:  TAXES

     8.1  Real Estate Taxes Defined.  As used herein, the term "Real Estate
          --------------------------
          Taxes" shall mean all taxes and assessments which have accrued within
          the Term of this Lease, including but not limited to, general or
          special, ordinary or extraordinary, foreseen or unforseen, assessed,
          levied or imposed by any governmental authority upon the Building and
          the Land and upon the fixtures, machinery, equipment or systems in,
          upon or used in connection with any of the foregoing, and the rental,
          revenue or receipts derived therefrom, under the current or any future
          taxation or assessment system or modification of, supplement to, or
          substitute for such system.  Real Estate Taxes also shall include

                                      -9-
<PAGE>

          special assessments which are in the nature of or in substitution for
          real estate taxes, including, without limitation, road improvement
          assessments, special use area assessments and school district
          assessments.  If at any time the method of taxation prevailing at the
          Date of Lease shall be altered so that in lieu of, as a substitute for
          or in addition to the whole or any part of the taxes now levied or
          assessed, there shall be levied or assessed a tax of whatever nature,
          then the same shall be included as Real Estate Taxes hereunder.
          Further, for the purposes of this Article, Real Estate Taxes shall
          include the reasonable expenses (including, without limitation,
          reasonable attorney's fees) incurred by Landlord in challenging or
          obtaining or attempting to obtain a reduction of such Real Estate
          Taxes, to the extent of any reduction.  Notwithstanding the foregoing,
          Landlord shall have no obligation to challenge Real Estate Taxes.  If
          as a result of any such challenge, a tax refund is made to Landlord,
          then the amount of such refund less the reasonable expenses of the
          challenge shall be deducted from Real Estate Taxes due in the Lease
          Year such refund is received.

     Notwithstanding the foregoing, Real Estate Taxes shall not include
penalties and interest on taxes resulting from Landlord's delinquency in paying
the same nor any inheritance, estate, succession, transfer, gift, franchise or
corporation tax (such corporation tax shall include taxies levied solely against
a corporation or similar entity or corporate taxes or the like; such corporation
tax shall exclude taxes included on, for example, utility bills or bills for
goods or services incurred in relation to the operation of the Building or the
Common Area Envelope) levied or imposed upon Landlord nor any real estate
transfer tax, mortgage lien tax, documentary stamp tax, recording fees or the
like.

          Real Estate Taxes shall also exclude any rent, gross receipt, business
taxes, income or profit tax of any kind whatsoever. Notwithstanding anything in
this Section to the contrary, (i) if any betterments assessment is payable in
installments, the Real Estate Taxes for any tax year shall include only such
installments of such betterments assessment as is allocable to such tax year,
(ii) if for any tax year included within the Term of this Lease a betterments
assessment is assessed for an improvement (such as a street or sewer) made,
commenced, or authorized prior to the time the Building first opens for
business, then, except for any front foot benefit charges and except as
hereinafter provided, such assessment shall not be included in the definition of
Real Estate Taxes for any tax year.

ARTICLE 9:  PARKING

     9.1  Changes to Parking Facilities.  Subject to Section 3.1, Landlord shall
          -----------------------------
          have the right, from time to time, without Tenant's consent, to
          change, alter, add to, temporarily close or otherwise affect the
          Parking Facilities in such manner as Landlord may decide provided the
          total number of parking spaces allocable to the Building does not
          decrease and that Landlord's actions do not materially interfere with
          Tenant's use of the Premises.   The total number of parking spaces
          shall be not less than two hundred forty (240) or as required by law
          to the extent applicable to the Building, whichever is greater.  One
          hundred sixty-five (165) of said parking spaces shall be designated by
          Landlord for Tenant's exclusive use and eleven (11) of which shall be
          located in front of the Building as marked on Exhibit A-2 as "Trex
          Visitor" spaces.  Upon request by Tenant, Landlord shall use
          commercially reasonable efforts to ensure and enforce Tenant's right
          to use exclusive parking spaces.  Any material change to the parking
          area as is defined on Exhibit A-2 shall be preapproved by Tenant.
          Said approval shall not be unreasonably withheld, conditioned or
          delayed.

                                      -10-
<PAGE>

ARTICLE 10:  USE

     Tenant shall occupy the Premises solely for the Permitted Use.  The
     Premises shall not be used for any other purpose without the prior written
     consent of Landlord which consent shall not be unreasonably withheld,
     conditioned, or delayed.   Tenant shall comply, at Tenant's expense, with
     (i) all present and future laws, ordinances, rules, requirements,
     regulations and orders of the United States of America, the Commonwealth of
     Virginia and any other public or quasi-public federal, state or local
     authority and/or any department or agency thereof, having jurisdiction over
     the Premises and relating Tenant's particular use, or alteration of the
     Premises performed by Tenant (ii) any reasonable requests of Mortgagee or
     any insurance company providing coverage with respect to the Premises to
     the extent the same does not cause  expense to Tenant or otherwise
     interfere with Tenant's use and occupancy of the Premises and does not
     pertain to any structural alteration which is Landlord's responsibility.
     Tenant shall not use or occupy the Premises in any manner that is unlawful
     or dangerous or that shall constitute waste, unreasonable annoyance or a
     nuisance to Landlord or the other tenants of the Building.  Landlord shall
     comply, at Landlord's sole cost and expense, with all governmental laws,
     rules, regulations, and orders of the United States of America, the
     Commonwealth of Virginia and any other public or quasi-public Federal,
     State or local authority and/or any department or agency thereof having
     jurisdiction over the Premises with regard to: (a) requirements prior to
     the Commencement Date including, but not limited to, requirements imposed
     with respect to Tenant work  that is performed by Landlord or Landlord's
     Agent (in the event Tenant performs work after obtaining consent from
     Landlord then Tenant shall have the sole responsibility to comply with all
     governmental laws, rules, regulations and orders); (b) the nature of the
     structure of the Premises; (c) the building operating and life safety
     systems; (d) the Common Area; and/or (e) Landlord's failure to make any
     repairs required of Landlord hereunder.  If a fire sprinkler or any
     additional exits are ever required, the same shall be installed or
     constructed by Landlord at Landlord's sole cost and expense.  Landlord
     represents that Tenant's stated use does not conflict with Landlord's
     insurance and that Tenant shall not be precluded from using the Premises in
     accordance with the stated Permitted Use or be liable or obligated to
     reimburse Landlord for any increases in Landlord's insurance premium or
     rates resulting from Tenant's use of the Premises if Tenant is conducting
     its normal business in accordance with the stated Permitted Use for which
     the Premises were leased to Tenant.

ARTICLE 11:  ASSIGNMENT AND SUBLETTING

     11.1 Consent. Tenant shall have the absolute right to assign this Lease or
          sublet all or any portion of the Premises without the prior written
          consent of Landlord, provided, however that no such assignment or
          subletting shall release Tenant or Guarantor of their liability under
          the Lease. For an assignment to be effective, any assignee must
          deliver within thirty (30) days an agreement by which it assumes all
          of the obligations of Tenant hereunder.

ARTICLE 12:  MAINTENANCE AND REPAIR

     12.1 Landlord's Obligation.  Landlord shall keep and maintain in good
          ---------------------
          repair (including replacements as necessary) and working order the
          Building, the Common Area and the equipment within and serving the
          Premises and the Building (excluding Tenant's leasehold improvements
          made by Tenant in the Premises) that are required for the maintenance
          and operation of the Premises and the Building.  Except as otherwise

                                      -11-
<PAGE>

          provided in Article 7 or Article 10, the cost of such maintenance and
          repairs to the Building and said equipment shall be included in the
          Operating Expenses and paid by Landlord.   Tenant shall give Landlord
          written notice of any defect or need for repairs.  After becoming
          aware, Landlord shall have a reasonable opportunity to repair or cure
          such defect. Landlord's liability with respect to any defects, repairs
          or maintenance for which Landlord is responsible under any of the
          provisions of this Lease shall be limited to the cost of such repairs
          or maintenance or the curing of such defect.  In the event of an
          emergency requiring immediate action, e.g., danger to health, life or
          property, fire, water seepage, sewer back-up, cessation or
          interruption of any facility serving the Premises, and the like
          (herein called "Emergency") or in the event Landlord fails to make
          repairs as set forth herein within a reasonable period of time (i.e.
          within five days), Tenant may repair the cause of the emergency or the
          damage which Landlord has failed to repair whether the means of
          repairing the same are located within the Premises or other portions
          of Building, prior to giving any written notice to Landlord (or in the
          case of Landlord's failure to repair, after five (5) days' written
          notice); provided, however, that Tenant shall notify Landlord within
          two (2) business days after expiration of the Emergency.  Landlord
          shall reimburse Tenant within thirty (30) days after notice for the
          cost of said reasonable repairs.

     12.2 Tenant's Obligation.   Tenant shall, at its own expense, maintain all
          -------------------
          improvements in the Premises made by Tenant and other real and
          personal property within the Premises in good condition, promptly
          making all necessary repairs and replacements.  Notwithstanding what
          is stated above, the Tenant will have no obligation to maintain the
          HVAC system, electric service and basic plumbing service to the
          Premises.  Tenant shall repair at its expense, any and all damage
          caused by Tenant, Tenant's invitees while within the Premises or
          Tenant's employees, agents, contractors or subcontractors to the
          Building, the Common Area, or the Premises, including equipment within
          and serving the Building, ordinary wear and tear excepted.  Except as
          set forth in 12.1 above, Tenant shall bear the cost of, but shall not
          itself perform without Landlord's prior consent (which consent shall
          not be unreasonably withheld, conditioned or delayed), any such
          repairs caused by Tenant as set forth in the previous sentence which
          would affect the Building's structure or mechanical or electrical
          systems or which would be visible from the exterior of the Building or
          from any interior Common Area of the Building.  Where Landlord
          performs such repairs, Tenant shall promptly pay to Landlord within
          thirty (30) days after notice, all costs incurred in connection
          therewith plus interest thereon at the Interest Rate from the demand
          date until paid.  Without prior written notice to Landlord, Tenant
          shall not have access to the roof of the Building for any purpose
          whatsoever.  Tenant's liability with respect to any defects, repairs
          or maintenance for which Tenant is responsible under any of the
          provisions of this Lease shall be limited to the cost of such repairs
          or maintenance or the curing of such defect.

     12.3 Landlord's Right to Maintain or Repair.  If, within thirty (30) days
          --------------------------------------
          following notice to Tenant, Tenant fails to commence to repair or
          replace any damage to the Premises or Building which is Tenant's
          obligation to perform, and diligently pursue timely completion of such
          repair and replacement, Landlord may, at its option, cause all
          required maintenance, repairs or replacements to be made.  Tenant
          shall within thirty (30) days after notice,  pay Landlord all costs
          incurred in connection therewith plus interest thereon at the Interest
          Rate from the due date until paid.

     12.4 The provisions of this Article are subject to the provisions of
          Article 21.

                                      -12-
<PAGE>

ARTICLE 13:  INITIAL CONSTRUCTION; ALTERATIONS

     13.1 Initial Construction.  Landlord and Tenant agree that the construction
          ---------------------
          of the Tenant Work and other initial construction with respect to the
          Premises shall be performed in accordance with Exhibit F attached
                                                         ---------
          hereto and made a part hereof.

     13.2 Alterations.  During the Term, Tenant shall not make or permit any
          ------------
          Alterations affecting the structural integrity or the common operating
          systems of the Building without the prior written consent of Landlord
          which shall not be unreasonably withheld, conditioned or delayed.
          Landlord may impose any reasonable conditions to its consent,
          including without limitation, (i) delivery to Landlord of written and
          unconditional waivers of mechanic's and materialmen's liens as to the
          Premises, the Building and the Land for all work, labor and services
          to be performed and materials to be furnished, signed by all
          contractors, subcontractors, materialmen and laborers participating in
          the Alterations providing materials and labor for the Alterations
          exceed a value of $500,000.00, (ii) prior approval of the plans and
          specifications and Tenant's contractor(s) with respect to the
          Alterations, and (iii) supervision by Landlord's representative at
          Tenant's expense of the Alterations.  The Alterations shall conform to
          the requirements of Landlord's and Tenant's insurers and of the
          Federal, state and local governments having jurisdiction over the
          Premises, shall be performed in accordance with the terms and
          provisions of this Lease in a good and workmanlike manner befitting a
          first class office building.  If the Alterations made pursuant to this
          Section 13.2 are not performed as herein required, Landlord shall have
          the right, at Landlord's option, to halt any further Alterations, or
          to require Tenant to perform the Alterations as herein required or to
          require Tenant to return the Premises to its condition before such
          Alterations.   Subject to Section 13.3 herein, all Alterations and
          fixtures, whether temporary or permanent in character, made in or upon
          the Premises either by Tenant or Landlord, will immediately become
          Landlord's property and, at the end of the Term will remain on the
          Premises without compensation to Tenant.  Notwithstanding the
          foregoing,  if any mechanic's or materialmen's lien is filed against
          the Premises, the Building or the Land for work claimed to have been
          done for, or materials claimed to have been furnished to or for the
          benefit of, Tenant, such lien shall be discharged of record by Tenant
          within thirty (30) days after notice by Landlord by the payment there
          of or the filing of any bond required by law.  If Tenant shall fail to
          discharge any such lien, Landlord may (but shall not be obligated to)
          discharge the same, the cost of which shall be paid by Tenant within
          ten (10) days of demand.  Neither Landlord's consent to the
          Alterations nor anything contained in this Lease shall be deemed to be
          the agreement or consent of Landlord to subject Landlord's interest in
          the Premises, the Building or the Land to any mechanic's or
          materialmen's liens which may be filed in respect of the Alterations.

     13.3 Permitted Alterations.  Tenant may, at its own expense, without
          ----------------------
          Landlord's consent, but with prior written notice to Landlord, from
          time to time during the Term, make nonstructural, non-exterior
          alterations costing less than $500,000.00 in and to the interior of
          the Premises, as it may find necessary or convenient for its purposes.
          Notwithstanding the foregoing, Tenant must obtain Landlord's prior
          written consent, which shall not be unreasonably withheld, conditioned
          or delayed for any alterations made by a subtenant in connection with
          a use other than standard office use (a use different than Tenant's
          standard office use).  Tenant may retain an interest in any
          improvements or Alterations

                                      -13-
<PAGE>

          made to the Premises for purposes of amortization thereof. Tenant may
          erect a satellite dish or comparable roof equipment on the roof of the
          Building subject to Landlord's reasonable designation as to the
          location thereof and provided Tenant does not void any applicable roof
          warranties.

     13.4 Landlord Alterations.  Landlord shall have no obligation to make any
          ---------------------
          Alterations in or to the Premises, the Building, the Common Area or
          the Land except as specifically provided in the Work Agreement or as
          required by law.  Landlord hereby reserves the right, from time to
          time, to make Alterations to the Building, change the Building
          dimensions, erect additional stories thereon and attach other
          buildings and structures thereto, and to erect such scaffolding and
          other aids to construction as Landlord deems appropriate and no such
          Alterations, changes, construction or erection shall constitute an
          eviction, constructive or otherwise, or permit Tenant any abatement of
          Rent or claim subject however to the provisions of Section 3.1.

ARTICLE 14:  SIGNS

     No sign, advertisement or notice shall be inscribed, painted, affixed,
     placed or otherwise displayed by Tenant on any part of the Land or the
     outside or the inside (including, without limitation, the windows) of the
     Building or the Premises.  In addition to the sign referenced in Section
     1.3 of the Work Agreement, Tenant may, at Tenant's sole expense, place a
     tenant identification sign on an exterior Building monument sign or on the
     Building in a location and appearance approved by Landlord which approval
     shall not be unreasonably withheld, conditioned or delayed.  Such signage
     shall be in accordance with all applicable covenants, restrictions,
     governmental regulations and Landlord's signage requirements.  Tenant shall
     have the foregoing right for a period of one (1) year from the Commencement
     Date to install said sign.  Landlord shall also, at its sole cost and
     expense, install suite entry signage and a building directory in the
     Building.  Any other permitted signs shall be installed and maintained by
     Landlord at Tenant's sole expense.  If any prohibited sign, advertisement
     or notice is nevertheless exhibited by Tenant, Landlord shall have the
     right to remove the same after ten (10) days' notice, and Tenant shall pay
     any and all expenses incurred by Landlord in such removal, together with
     interest thereon at the Interest Rate, upon demand.  Landlord shall have
     the right to prohibit any sign, on the Building which, in Landlord's
     reasonable opinion, tends to impair the reputation of the Building or its
     desirability as a first class office building.  Tenant shall have the right
     to the most conspicuous sign on the Building or on the Building Monument
     Sign at Tenant's sole cost and expense.

ARTICLE 15:  TENANT'S EQUIPMENT AND PROPERTY

     15.1 Moving Tenant's Property.  Any and all damage or injury to the
          -------------------------
          Premises or the Building caused by moving the property of Tenant into
          or out of the Premises, or due to the same being on the Premises,
          shall be repaired by Tenant.  Tenant shall promptly remove from the
          Common Area any of Tenant's furniture, equipment or other property
          there deposited.

     15.2 Installing and Operating Tenant's Equipment.  Without first obtaining
          --------------------------------------------
          the written consent of Landlord which shall not be unreasonably
          withheld, conditioned or delayed, Tenant shall not install or operate
          in the Premises (i) any electrically operated equipment or other
          machinery, other than standard office or kitchen equipment that does
          not require wiring, cooling or other service in excess of Building
          standards, (ii) any equipment of any kind or

                                      -14-
<PAGE>

          nature whatsoever which will require any changes, replacements or
          additions to, or changes in the use of, any water, heating, plumbing,
          air conditioning or electrical system of the Building to the extent
          not exclusively serving the Premises, or (iii) any equipment which
          causes the floor load to exceed the load limits reasonably set by
          Landlord for the Building. Landlord's consent to such installation or
          operation may be conditioned upon the payment by Tenant of additional
          compensation for any excess consumption of utilities and any
          additional power, wiring, cooling or other service (as determined in
          the reasonable sole discretion of Landlord) that may result from such
          equipment. Machines and equipment which cause noise or vibration that
          may be transmitted to and adversely affect the structure of the
          Building or to any space therein so as to be reasonably objectionable
          to Landlord or any other Building tenant shall be installed and
          maintained by Tenant, at its expense, on vibration eliminators or
          other devices sufficient to eliminate such noise and vibration.
          Notwithstanding what is stated above Tenant may install minor
          appliances such as a dishwasher, water cooler or coffee maker,
          toaster, refrigerator or other appliances commonly found in large
          office spaces.

ARTICLE 16:  RIGHT OF ENTRY

     Tenant shall permit Landlord or its Agents, at any time and with one
     business day's notice (except in cases of emergencies), to enter the
     Premises, without charge therefor to Landlord and without diminution of
     Rent, (i) to examine, inspect and protect the Premises and the Building,
     (ii) to make such Alterations and repairs or perform such maintenance
     permitted or required by this Lease (iii) to exhibit the same to
     prospective purchasers of the Building or to present or future Mortgagees
     or (iv) to exhibit the same to prospective tenants during the last six (6)
     months of the Term and to erect outside the Building a reasonable sign
     indicating the Premises are available.  In the event any such entry
     materially  interferes with the operation of Tenant's business, all rent
     shall abate during such period of material interference.

ARTICLE 17:  INSURANCE

     17.1 Insurance Rating.  Tenant shall not conduct or permit any activity, or
          -----------------
          place any equipment or material, in or about the Premises, the
          Building or the Common Area which will increase the rate of fire or
          other insurance on the Building; and if any increase in the rate of
          insurance is stated by any insurance company or by the applicable
          insurance rating bureau to be due to any activity, equipment or
          material of Tenant in or about the Premises, the Building or the
          Common Area, such statement shall be conclusive evidence that the
          increase in such rate is due to the same and, as a result thereof,
          Tenant shall pay any such increase to Landlord upon demand.  Landlord
          represents that the Tenant's stated intended use and the equipment
          used in connection therewith shall not cause an increase of Landlord's
          insurance premiums or a violation of Landlord's insurance policies.

     17.2 Insurance for Personal Property.  Tenant shall, at its sole cost and
          --------------------------------
          expense, procure and maintain throughout the Term a property insurance
          policy (written on an "Special Risk" basis) insuring all of Tenant's
          personal property, including but not limited to equipment, furniture,
          fixtures, furnishings and leasehold improvements which are the
          responsibility of Tenant for not less than the full replacement cost
          of said property.  Should Tenant elect not to replace or repair
          Tenant's property with insurance proceeds, then Tenant waives all
          claims that it may have against Landlord to recover damages or repair
          or replacement of Tenant's property.

                                      -15-
<PAGE>

     17.3 Requirements of Insurance Coverage.  All such insurance required to be
          -----------------------------------
          carried by Tenant herein shall be with an insurance company licensed
          to do business in the Commonwealth of Virginia and complies with the
          requirements herein.  Such insurance (i) shall contain an endorsement
          that such policy shall remain in full force and effect notwithstanding
          that the insured has released its right of action against any party
          before the occurrence of a loss; (ii) shall name Landlord, Tenant and,
          at Landlord's request, any Mortgagee or ground lessor, as an
          additional named insured parties; and (iii) shall provide that the
          policy shall not be canceled, failed to be renewed or materially
          amended without at least thirty (30) days' prior written notice
          (fifteen (15) days if due to non-payment of premium) to Landlord and,
          at Landlord's request, any Mortgagee.  Upon request or before the
          Commencement Date and, thereafter, before the expiration date of the
          insurance policy, an original of the policy (including any renewal or
          replacement policy) or a certified copy thereof, together with
          evidence reasonably satisfactory to Landlord of the payment of all
          premiums for such policy, shall be delivered to Landlord and, at
          Landlord's request, to any Mortgagee.  Tenant shall at all times
          during the Lease Term keep in force a policy or policies of public
          liability insurance or an endorsement on a blanket liability insurance
          policy or policies, which policy, policies or endorsement shall
          provide that Landlord is named as additional insured, against any and
          all damages and liability on account of, or arising out of injuries to
          persons or property or the death of any person or for property damage
          resulting from acts or omissions of Tenant, its agents, contractors or
          employees, or occurring in the Premises, in the amount of Five Million
          Dollars ($5,000,000) combined single limit in any one accident.  All
          insurance policies herein to be procured by Tenant  shall be issued by
          insurance companies  having a Best's Rating of A-X and authorized to
          do business in the State.  Neither issuance of any insurance policy
          required hereunder, nor the minimum limits specified herein with
          respect to Tenant's insurance coverage, shall be deemed to limit or
          restrict in any way Tenant's liability arising under or out of this
          Lease.  Upon request, Tenant shall deliver to Landlord a duplicate
          original or certified copy of each such policy or a certificate of the
          insurer, certifying that such policy has been issued, providing the
          coverage required by this Section and containing provisions specified
          herein, together with evidence of payment of all applicable premiums.
          Any insurance required to be carried hereunder may be carried under a
          blanket policy covering the Premises and other locations of Tenant.
          The term "insurance policy" as used herein shall be deemed to include
          any extensions or renewals of such insurance policy.  Tenant shall
          commence to adjust any loss within 30 days of any casualty and shall
          diligently pursue such adjustment.

     17.4 Waiver of Subrogation. Tenant and Landlord hereby waive and release
          ----------------------
          any and all right of recovery against the other, including agents,
          contractors and employees, arising during the Term for any and all
          loss or damage to any property (including Tenant's fixtures,
          furnishings, equipment, merchandise and other personal property)
          located within or constituting a part of the Building, which loss or
          damage arises from the perils coverable by an All Risk Policy (Special
          Form) or which right of recovery arises from loss of earnings or rents
          resulting from damage caused by such a peril.  This mutual waiver is
          in addition to any other waiver or release contained in this Lease.
          Landlord and Tenant shall each have their insurance policies issued in
          such form as to waive any right of subrogation which might otherwise
          exist.  In addition, neither party waives claims against the other for
          losses sustained which are the result of a party's intentional
          misconduct.

                                      -16-
<PAGE>

     17.5 Security.  In the event that Landlord engages the services of a
          ---------
          professional security system for the Building, it is understood that
          such engagement shall in no way increase Landlord's liability for
          occurrences and/or consequences which such a system is designed to
          detect or avert and that Tenant shall look solely to its insurer as
          set out above for claims or damages or injury to any person or
          property.

     17.6 Landlord's Insurance.  Landlord shall maintain at all times during the
          ---------------------
          Term an All Risk Policy (Special Form) insuring against damage to any
          portion of the Building, improvements and the Land.  Upon completion
          of construction of the Building, such insurance shall be obtained
          specifying an owner's rating for the Building which contemplates a
          status of the Building as an existing, operating entity and not as a
          property under development.  Such insurance shall be in the amount of
          the full replacement cost, including demolition cost but excluding
          foundations.   Landlord shall at all times during the Lease Term keep
          in force a policy or policies of public liability insurance or an
          endorsement on a blanket liability insurance policy or policies, which
          policy, policies or endorsement shall provide that Tenant is named as
          additional insured, against any and all damages and liability on
          account of, or arising out of injuries to persons or property or the
          death of any person or for property damage resulting from acts or
          omissions of Landlord, its agents, contractors or employees, or
          occurring on or about the Common Areas, in the amount of Five Million
          Dollars ($5,000,000) combined single limit in any one accident.  Said
          policy or policies shall be obtained at a premium which shall not
          exceed the average premium for an owner's rate for the same class of
          property in the state where the Building is located and shall include
          contractual liability insurance recognizing the liability assumed in
          the indemnification provision of the Lease,  contain a cross-liability
          endorsement, and be with an insurer which is rated at least A and X in
          Best's Insurance Reports or equivalent.  All insurance policies herein
          to be procured by Landlord  shall be issued by insurance companies
          have a Best's Rating of A-X and authorized to do business in the
          State.  Neither issuance of any insurance policy required hereunder,
          nor the minimum limits specified herein with respect to Landlord's
          insurance coverage, shall be deemed to limit or restrict in any way
          Landlord's liability arising under or out of this Lease.  Upon
          request, Landlord shall deliver to Tenant a duplicate original or
          certified copy of each such policy or a certificate of the insurer,
          certifying that such policy has been issued, providing the coverage
          required by this Section and containing provisions specified herein,
          together with evidence of payment of all applicable premiums.  Any
          insurance required to be carried hereunder may be carried under a
          blanket policy covering the Building and other locations of Landlord.
          The term "insurance policy" as used herein shall be deemed to include
          any extensions or renewals of such insurance policy.  Landlord shall
          commence to adjust any loss within 30 days of any casualty and shall
          diligently pursue such adjustment.

ARTICLE 18:  LANDLORD SERVICES AND UTILITIES

     18.1 Ordinary Services to the Premises. Landlord shall furnish to the
          ---------------------------------
          Premises throughout the Term (i) electricity, heating and air
          conditioning appropriate for the Permitted Use during the Business
          Hours, (ii) reasonable janitorial service, (iii) regular trash removal
          from Premises, (iv) hot and cold water from points of supply, (v)
          subject to Article 10, restrooms as are required by applicable code,
          and (iv) elevator service, if there is an elevator in the Building,
          provided that Landlord shall have the right to temporarily remove such
          elevators from service as may be required for moving, freight or for

                                     -17-

<PAGE>

          servicing the elevators or the Building so long as there is at least
          one elevator operating at all times (excluding instances where there
          are brief periods for service or repair).  Landlord agrees to furnish
          landscaping and grounds maintenance and snow clearing for the areas
          used in common by the tenants of the Building.  Landlord shall be
          under no responsibility or liability for failure or interruption in
          such services caused by breakage, accident, strikes, repairs or any
          other cause or causes beyond the control of Landlord, nor in any event
          for any indirect or consequential damages; and failure or omission on
          the part of Landlord to furnish such service shall not be construed as
          an eviction of Tenant, nor work an abatement of Rent, nor render
          Landlord liable in damages, nor release Tenant from prompt fulfillment
          of any of the covenants of this Lease.

     18.2 Interruption of Services.  Notwithstanding anything in this Lease to
          -------------------------
          the contrary, if any of the services listed above are interrupted or
          suspended for a period of time and to the extent that the Tenant is
          substantially unable to function in the Premises, then Tenant's Rent
          shall abate during the time and to the extent the Tenant is
          substantially unable to function in said Premises.  If any such
          interference continues for one hundred twenty (120) consecutive days,
          Tenant may terminate this Lease.

ARTICLE 19:  LIABILITY OF LANDLORD

     19.1 Except to the extent expressly prohibited by law, Tenant and Landlord
          hereby waive any claim each may have against the other or its agents,
          contractors or employees for any consequential damages sustained
          arising out of the loss or damage to any person or property of Tenant
          or Landlord, as the case may be.

     19.2 Indemnity.  Tenant shall indemnify and hold Landlord and its agents,
          ----------
          contractors or employees harmless from and against any and all damage,
          claim, liability, cost or expense (including, without limitation,
          reasonable attorneys' or other reasonable professionals' fees of every
          kind and nature (including, without limitation, those arising from any
          injury or damage to any person, property or business) incurred by or
          claimed against Landlord or its agents, contractors or employees,
          directly or indirectly, as a result of, arising from or in connection
          with Tenant's or its contractor's, employee's, or agent's use and
          occupancy of the Premises or the negligence or wilful misconduct of
          Tenant, its contractors, employees and agents.  Landlord shall
          indemnify and hold Tenant and its agents, contractors or employees
          harmless from and against any and all damage, claim, liability, cost
          or expense (including, without limitation, reasonable attorneys' or
          other reasonable professionals' fees of every kind and nature
          (including, without limitation, those arising from any injury or
          damage to any person, property or business) incurred by or claimed
          against Tenant or its agents, contractors or employees, directly or
          indirectly, as a result of, arising from or in connection with
          Landlord's or its contractors, employees, or agent's use, ownership
          and occupancy of the Premises, the Building or the Common Area or the
          negligence or wilful misconduct of Landlord or its contractors,
          employees or agents.

ARTICLE 20:  RULES AND REGULATIONS

     Tenant shall at all times abide by and observe the Rules and Regulations
     (as attached hereto as Exhibit B) for the operation and maintenance of the
     Building and the Common Area and the Rules and Regulations shall be deemed
     to be covenants of the Lease to be performed and/or

                                     -18-

<PAGE>

     observed by Tenant. Landlord shall not be liable to Tenant for any
     violation by any party of the Rules and Regulations or the terms of any
     other Building Lease. If there is any inconsistency between this Lease and
     the Rules and Regulations, this Lease shall govern. The Rules and
     Regulations must be reasonable and uniformly enforced against other tenants
     by Landlord.

ARTICLE 21:  DAMAGE; CONDEMNATION

     21.1 Damage to the Premises.  If the Premises shall be damaged by fire or
          -----------------------
          other cause Landlord shall diligently and as soon as practicable after
          such damage occurs (taking into account the time necessary to effect a
          satisfactory settlement with any insurance company involved) which
          Landlord shall make all reasonable efforts to cause the insurance
          company to adjust the claim within thirty (30) days of the casualty)
          repair such damage at the expense of Landlord.  Notwithstanding the
          foregoing, if the Premises or the Building are damaged during the last
          two (2) Lease Years, then Landlord or Tenant within thirty (30) days
          from the date of such damage, may terminate this Lease by notice to
          the other (under no circumstances shall Tenant be entitled to elect to
          terminate the Lease if the loss or damage is caused by the Tenant's
          negligence) provided, however that Tenant may negate Landlord's
          termination by exercising Tenant's option to extend within thirty (30)
          days after receipt of Landlord's termination notice.  If either
          Landlord or Tenant terminates this Lease, the Rent shall be
          apportioned and paid to the date of such termination.  If neither
          Landlord nor Tenant so elects to terminate this Lease but the damage
          required to be repaired by Landlord is not repaired within one hundred
          fifty (150) days from the date of such damage (such one hundred fifty
          (150) day period to be extended by the period of any delay outside the
          direct control of Landlord plus a reasonable period for a satisfactory
          settlement with any insurance company involved) not to exceed thirty
          (30) days), Tenant, within thirty (30) days from the expiration of
          such one hundred fifty (150) day period (as the same may be extended),
          may terminate this Lease by notice to Landlord.  Within thirty (30)
          days after any such damage, Landlord shall deliver to Tenant a
          statement from Landlord's insurance adjuster or architect stating its
          good faith estimate as to the time necessary to completely repair such
          damage.  In the event such estimate exceeds one hundred twenty (120)
          days, Tenant may terminate the Lease.  During the period that Tenant
          is deprived of the use of the damage Portion of the Premises, Fixed
          Rent and Tenant's proportionate share of Operating Expenses and Taxes
          shall be reduced by the ratio that the rentable square footage of the
          Premises damaged bears to the total rentable square footage of the
          Premises before such damage. Notwithstanding anything herein to the
          contrary, Landlord shall not be required to rebuild, replace or repair
          personal property of Tenant.

     21.2 Condemnation.  If the whole or a Substantial Part of the Premises or
          -------------
          the Building shall be taken or condemned by any governmental or quasi-
          governmental authority for any pubic or quasi-public use or purpose
          (including, without limitation, sale under threat of such a taking),
          then the Term shall cease and terminate as of the date when title vest
          in such governmental or quasi-governmental authority, and Rent shall
          be prorated to the date when title vests in such governmental or
          quasi-governmental authority.  If less than a Substantial Part of the
          Premises is taken or condemned by any governmental or quasi-
          governmental authority for any public or quasi-public use or purpose
          (including, without limitation, sale under threat of such a taking),
          Tenant may elect to terminate the Lease within thirty (30) days after
          such taking.  If this Lease is not terminated, Fixed Rent and Tenant's
          proportionate share of Operating Expenses and Taxes shall be reduced
          by the

                                     -19-

<PAGE>

          ratio that the portion so taken bears to the rentable square footage
          of the Premises before such taking, effective as of the date when
          title vests in such governmental or quasi-governmental authority, and
          this Lease shall otherwise continue in full force and effect. Tenant
          shall have no claim against Landlord (or otherwise) as a result of
          such taking, and Tenant hereby agrees to make no claim against the
          condemning authority for any portion of the amount that may be awarded
          as compensation or damages as a result of such taking; provided,
          however, that Tenant may, to the extent allowed by law, claim an award
          for moving expenses, loss of any business and for the taking of any of
          Tenant's property which does not, under the terms of this Lease,
          become the property of Landlord at the termination hereof, as long as
          such claim is separate and distinct from any claim of Landlord and
          does not diminished Landlord's award.

ARTICLE 22:  DEFAULT

     22.1 Events of Default.  Each of the following shall constitute an Event of
          ------------------
          Default: (i) Tenant fails to pay Rent within ten (10) days after
          notice from Landlord; (ii) Tenant fails to observe or perform any
          other term, condition or covenant herein binding upon or obligating
          Tenant within thirty (30) days after notice from Landlord or an
          additional period of time not to exceed sixty (60) days so long as
          Tenant is diligently pursuing a cure, (iii) Tenant or any Guarantor
          makes or consents to a general assignment for the benefit of creditors
          or a common law composition of creditors, or a receiver of the
          Premises or all or substantially all of Tenant's or Guarantor's assets
          is appointed, or (iv) Tenant or Guarantor files a voluntary petition
          in any bankruptcy or insolvency proceeding, or an involuntary petition
          in any bankruptcy or insolvency proceeding is field against Tenant or
          Guarantor and is not discharged by Tenant or Guarantor within ninety
          (90) days.

     22.2 Landlord's Remedies.  Upon the occurrence of an Event of Default,
          --------------------
          Landlord, at its option, without further notice or demand to Tenant,
          may in addition to all other rights and remedies provided in this
          Lease, at Law or in equity (except for acceleration of damages or
          rent):

          (i)   By judicial process, terminate this Lease and Tenant's right of
                possession of the Premises, and recover all damages to which
                Landlord is entitled under law, specifically including but
                without limitation, all of Landlord's expenses of returning the
                Premises into the condition in which it was required to be
                surrendered. If Landlord elects to terminate this Lease,
                provided Landlord has obtained a judgment terminating the Lease,
                every obligation of the parties shall cease as of the date of
                such termination, except that Tenant shall remain liable for
                payment of Rent and performance of all other terms and
                conditions of this Lease to the date of termination.

          (ii)  By judicial process, terminate Tenant's right of possession of
                the Premises without terminating this Lease, in which event
                Landlord may, but shall not be obligated to, relet the Premises,
                or any part thereof, for the account of Tenant, for such rent
                and term and upon such other conditions as are acceptable to
                Landlord. For purposes of such reletting, Landlord is authorized
                to redecorate, repair, alter and improve the Premises to the
                extent necessary in Landlord's sole discretion. Until Landlord
                relets the Premises, Tenant shall remain obligated tO pay Rent
                to

                                     -20-

<PAGE>

                Landlord as provided in this Lease. If and when the Premises
                are relet and if a sufficient sum is not realized from such
                reletting to satisfy the payment of Rent due under this Lease
                for any month, Tenant shall pay Landlord any such deficiency
                upon demand. Tenant agrees that Landlord may file suit to
                recover any sums due Landlord under this Section from time to
                time and that such suit or recovery of any amount due Landlord
                shall not be any defense to any subsequent action brought for
                any amount not previously reduced to judgment in favor of
                Landlord.

          (iii) Intentionally Deleted.

          (iv)  By judicial process, re-enter and repossess the Premises and
                remove all persons and effects therefrom, to summary proceeding,
                ejectment or other legal action.

          (v)   Recover from Tenant, to the extent permitted under the laws of
                the Commonwealth of Virginia, the value and/or cost of all
                concessions to Tenant under this Lease.

     22.3 Rights Upon Possession.  If Landlord takes possession pursuant to this
          -----------------------
          Article, with or without terminating this Lease, Landlord may, at its
          option, enter into the Premises, remove Tenant's Alterations, signs,
          personal property, equipment and other evidences of tenancy, and store
          them at Tenant's risk and expense or dispose of them as Landlord may
          see fit, and take and hold possession of the Premises; provided,
          however, that if Landlord elects to take possession only without
          terminating this Lease, such entry and possession shall not terminate
          this Lease or release Tenant or any Guarantor, in whole or in part,
          from the obligation to pay the Rent reserved hereunder for the full
          Term or from any other obligation under this Lease or any guaranty
          thereof.

     22.4 No Waiver.  If Landlord or Tenant shall institute proceedings against
          ----------
          the other and a compromise or settlement thereof shall be made, the
          same shall not constitute a waiver or any other covenant, condition or
          agreement herein contained, nor of any of Landlord's or Tenant's
          rights hereunder.  No waiver by Landlord or Tenant of any breach shall
          operate as a waiver of such covenant, condition or agreement, or
          operate as a waiver of such covenant, condition or agreement itself,
          or of any subsequent breach thereof.  No payment of Rent by Tenant or
          acceptance of Rent by Landlord shall operate as a waiver of any breach
          or default by Tenant under this Lease.  No payment by Tenant or
          receipt by Landlord of a lesser amount than the monthly installment of
          Rent herein stipulated shall be deemed to be other than a payment on
          account of the earliest unpaid Rent, nor shall any endorsement or
          statement on any check or communication accompanying a check for any
          payment by either party be deemed an accord and satisfaction, and
          Landlord or Tenant may accept such check or payment without prejudice
          to its right to recover the balance of such amount due or to pursue
          any other remedy provided in this Lease.  No re-entry by Landlord, and
          no acceptance by Landlord of keys from Tenant, shall be considered an
          acceptance of a surrender of the Lease.

     22.5 Right of Landlord to Cure Tenant's Default.  If an Event of Default
          -------------------------------------------
          shall occur, then Landlord may (but shall not be obligated to) make
          such payment or do such act to cure the Event of Default, and charge
          the amount of the expense thereof, together with interest thereon at
          the Interest Rate, to Tenant.  Such payment shall be due and payable
          upon

                                     -21-
<PAGE>

          demand. Any such payment made by Landlord on Tenant's behalf shall
          bear interest until paid at the Interest Rate.

     22.6 Late Payment.  If Tenant fails to pay any Rent within ten (10) days
          -------------
          after notice that such Rent was due and payable, Tenant shall pay to
          Landlord a late charge of five percent (5%) of the amount of such
          overdue Rent.

     22.7 Landlord's Default.  If Landlord shall fail to perform any of its
          obligations when and as due under this Lease (a "breach" or
          "default"), which default continues for a period of more than thirty
          (30) days after written notice from Tenant specifying such default (or
          as to any default which requires more than thirty (30) days to remedy,
          if such cure is not commenced promptly and pursued diligently or
          continues beyond the time reasonably necessary therefor)  Tenant may
          at its option upon written notice (1) if the default has a material
          and adverse effect upon Tenant's ability to operate its usual and
          regular business in the Premises, and Tenant has no other adequate
          remedy under this Lease or at law, declare the Term ended and vacate
          the Premises, and be relieved from all further obligations under this
          Lease (provided, however, prior to termination, Tenant shall send to
          Landlord an additional notice to Landlord, following the initial
          default notice, advising Landlord of Tenant's intention to terminate
          this Lease if the default is not cured within ten (10) days after such
          notice); and/or (2) incur any reasonable expense necessary to perform
          the obligation of Landlord specified in such notice; and/or (3) sue
          for injunctive relief; and/or (4) sue for specific performance; and/or
          (5) except as otherwise set forth in this Lease, set off any amount
          expended by Tenant as a result of such default, together with interest
          at the Interest Rate, against the next payments of Rent coming due
          under this Lease until recovered in full; and/or (6) avail itself of
          any other remedy provided herein or available at law or in equity
          (except for acceleration of damages).

     22.8 Mitigation.  Notwithstanding any of the terms and provisions herein
          -----------
          contained to the contrary, Landlord and Tenant shall each have the
          duty and obligation to use reasonable good faith efforts to mitigate
          any and all damages that may or shall be caused or suffered by virtue
          of the other's defaults under, or violation of, any of the terms and
          provisions of this Lease.

ARTICLE 23:  MORTGAGES

     23.1 Subordination.   This Lease is subject and subordinate to all ground
          --------------
          or underlying leases and to any first Mortgage(s) which may now or
          hereafter affect such leases or the Land and to all renewals,
          modifications, consolidations, replacements and extensions thereof.
          This subordination shall be self-operative; however, in confirmation
          thereof, Tenant shall execute  any instrument that Landlord or any
          first Mortgagee may reasonably request confirming such subordination
          within thirty (30) days after request therefor.  Notwithstanding the
          foregoing, before any foreclosure sale under a Mortgage, the Mortgagee
          shall have the right to subordinate the Mortgage to this Lease, and,
          in the event of a foreclosure, this Lease may continue in full force
          and effect and Tenant shall attorn to and recognize as its landlord
          the purchaser of Landlord's interest under this Lease.  Tenant shall,
          upon the request of a Mortgagee or purchaser at foreclosure, execute,
          acknowledge and deliver any instrument that has for its purpose and
          effect the subordination of the lien of any Mortgage to this Lease or
          Tenant's attornment to such Purchaser.  Landlord shall by the
          Commencement Date or thirty (30) days after the

                                     -22-
<PAGE>

          request by Tenant, and prior to a refinancing of the Building, deliver
          to Tenant a non-disturbance agreement reasonably satisfactory to
          Tenant from any Mortgagee or ground lessor substantially similar to
          the Agreement attached here to as Exhibit H.

     23.2 Mortgagee Protection.  Tenant agrees to give any Mortgagee by
          ---------------------
          certified mail, return receipt requested, a copy of any notice of
          default served upon Landlord, provided that before such notice Tenant
          has been notified in writing of the address of such Mortgagee.  Tenant
          further agrees to accept any cure from said Mortgagee within the cure
          periods provided herein.

     23.3 Subordination, Nondisturbance Agreement.  If the Premises are
          ----------------------------------------
          encumbered by a mortgage, deed of trust, or ground lease as of the
          date this Lease is executed and delivered by the parties hereto, and a
          fully executed Non-Disturbance, Subordination and Attornment Agreement
          is not delivered to Tenant concurrently with Landlord's delivery of
          the Premises to Tenant, Tenant may, in its sole discretion, (i)
          terminate this Lease by written notice given to Landlord at any time
          prior to the date a fully executed Non-Disturbance, Subordination and
          Attornment Agreement is delivered to Tenant, or (ii) abate Fixed Rent
          from the  Commencement Date through the date that a fully executed
          Non-Disturbance, Subordination and Attornment Agreement is delivered
          to Tenant.

ARTICLE 24:  SURRENDER; HOLDING OVER

     24.1 Surrender of the Premises.  Tenant shall surrender the Premises to
          --------------------------
          Landlord on the Expiration Date or earlier termination of this Lease,
          in broom-clean condition, including, without limitation, the repair of
          any damage to the Premises caused by the removal of any of Tenant's
          personal property or trade fixtures from the Premises, except for
          reasonable wear and tear and loss by fire or other casualty.  After
          five (5) days notice to Tenant, any of Tenant's personal property left
          on or in the Premises, the Building or the Common Area after the
          Expiration Date or earlier termination of this Lease shall be deemed
          to be abandoned, and, at Landlord's option, title shall pass to
          Landlord under this Lease.

     24.2 Holding Over.  In the event that Tenant shall not immediately
          -------------
          surrender the Premises to Landlord on the Expiration Date or earlier
          termination of this Lease, Tenant shall be deemed to be a month to
          month tenant upon all of the terms and provisions of this Lease,
          except the monthly Fixed Rent shall be one hundred fifty percent
          (150%) the monthly Fixed Rent in effect during the last month of the
          Term.

ARTICLE 25:  QUIET ENJOYMENT

     Landlord covenants that if Tenant shall pay Rent and perform all of the
     terms and conditions of this Lease to be performed by Tenant subject to
     applicable cure periods, Tenant shall during the Term peaceably and quietly
     occupy and enjoy possession of the Premises without molestation or
     hindrance by Landlord or any party claiming through or under Landlord,
     subject to the provisions of this Lease and any Mortgage to which this
     Lease is subordinate and easements, conditions and restrictions of record
     affecting the Land.

ARTICLE 26:  TENANT'S COVENANTS REGARDING HAZARDOUS MATERIALS

     26.1 Definition. As used in this Lease, the term "Hazardous Material" means
          ----------
          any flammable

                                     -23-
<PAGE>

          items, explosives, radioactive materials, hazardous or toxic
          substances, material or waste or related materials, including any
          substances defined as or included in the definition of "hazardous
          substances", "hazardous wastes", "infectious wastes", "hazardous
          materials" or "toxic substances" now or subsequently regulated under
          any federal, state or local laws, regulations or ordinances including,
          without limitation, oil, petroleum-based products, paints, solvents,
          lead, cyanide, DDT, printing inks, acids, pesticides, ammonia
          compounds and other chemical products, asbestos, PCBs and similar
          compounds, and including any different products and materials which
          are subsequently found to have adverse effects on the environment or
          the health and safety of persons.

     26.2 General Prohibition.  Tenant shall not cause or permit any Hazardous
          --------------------
          Material to be generated, produced, brought upon, used, stored,
          treated, discharged, released, spilled or disposed of on, in, under or
          about the Premises, the Building or the Land by Tenant or its agents,
          contractors and employees, sublessees or assignees in violation of any
          local, state or federal law.  Tenant shall indemnify, defend and hold
          Landlord harmless from and against any and all actions (including,
          without limitation, remedial or enforcement actions of any kind,
          administrative or judicial proceedings, and orders or judgments
          arising out of or resulting therefrom), costs, claims, damages
          (including, without limitation, punitive damages), expenses
          (including, without limitation, attorneys', consultants' and experts'
          fees, costs, court costs and amounts paid in settlement of any claims
          or actions), fines, forfeitures, or other civil, administrative or
          criminal penalties, injunctive or other relief (whether or not based
          upon personal injury, property damage, or contamination of, or adverse
          effects upon, the environment, water tables or natural resources),
          liabilities or losses arising from a breach of this prohibition by
          Tenant, its contractors, employees and agents, or sublessees or
          assignees.  Notwithstanding the foregoing, Landlord acknowledges that
          Tenant may use and store limited quantities of Hazardous Material in
          connection with the operation of its Permitted Use so long as the same
          are used and stored in compliance with laws.

     26.3 Notice.  In the event that Hazardous Materials are discovered upon, or
          -------
          under the Premises, the Building or the Land, provided the same were
          brought on to the Premises, Building or Land by Tenant, and the
          governmental agency or entity having jurisdiction over the Premises,
          the Building or the Land requires the removal of such Hazardous
          Materials, Tenant shall be responsible for removing those Hazardous
          Materials arising out of or related to the use or occupancy of the
          Premises by Tenant or its contractors, employees or agents,
          affiliates, sublessees or assignees but not those of its predecessors.
          Notwithstanding the foregoing, Tenant shall not take any remedial
          action in or about the Premises, the Building or the Land, without
          first notifying Landlord or Tenant's intention to do so and affording
          Landlord a reasonable opportunity to protect Landlord's interest with
          respect thereto.  Tenant immediately shall notify Landlord in writing
          of: (i) any spill, release, discharge or disposal of any Hazardous
          Material in, on or under the Premises, the Building, the Land or any
          portion thereof made by Tenant, (ii) any enforcement, cleanup, removal
          or other governmental or regulatory action instituted, contemplated,
          or threatened (if Tenant has notice thereof) pursuant to any Hazardous
          Materials Laws; (iii) any claim made or threatened by any person
          against Tenant, relating to damage, contribution, cost recovery,
          compensation, loss or injury resulting from or claimed to result from
          any Hazardous Materials; and (iv) any reports made by Tenant to any
          governmental agency or entity arising out of or in connection with any
          Hazardous Materials in, on, under or about or removed from the
          Premises, the Building or the Land,

                                     -24-
<PAGE>

             including any complaints, notices, warnings, reports or asserted
             violations in connection therewith. Tenant also shall supply to
             Landlord as promptly as possible, and in any event withing five (5)
             business days after Tenant first receives or sends the same, copies
             of all claims, reports, complaints, notices, warnings or asserted
             violations relating in any way to the Premises, the Building, the
             Land or Tenant's use or occupancy thereof.

     26.4    Survival.  The respective rights and obligations of Landlord and
             ---------
             Tenant under this Article 26 shall survive the expiration or
             earlier termination of this Lease.

     26.5    Landlord's Obligations, Representations and Warranties. Landlord
             -------------------------------------------------------
             warrants that the Building, Land and Premises are free of any
             asbestos or any other Hazardous Material. In the event there is
             discovered to be Hazardous Material in the Building, Land and/or
             Premises which has not been placed or introduced there by Tenant,
             its employees, agents or contractors, then Landlord shall, at its
             sole cost and expense bear the cost and expense of any
             investigation, testing, digging, removal or clean up required and
             any fines or penalties assessed as a result of the presence of
             Hazardous Material within, on or under the Land or the Building.
             Also under such circumstance, Landlord shall indemnify, defend and
             hold Tenant harmless from any claims, demands, suits, actions,
             awards, fines, clean up costs, expenses, attorney fees, etc., which
             may arise as a result of such presence, which indemnity shall
             survive the expiration or earlier termination of this Lease. If as
             a result of the presence of Hazardous Material, the Premises is
             substantially untenantable, Tenant shall have the right to either
             (i) abate Rent and all other charges payable under this Lease based
             upon the duration and extent of the interruption to Tenant's
             business or (ii) terminate this Lease upon sixty (60) days written
             notice to Landlord should the contamination be to the extent that
             it is not cured within ninety (90) days and the Premises is
             untenantable.

ARTICLE 27:  MISCELLANEOUS

     27.1    No Representations by Landlord.  Tenant acknowledges that neither
             -------------------------------
             Landlord or its agents nor any broker has made any representation
             or promise with respect to the Premises, the Building, the Land or
             the Common Area, except as herein expressly set forth, and no
             rights, privileges, easements or licenses are acquired by Tenant
             except as herein expressly set forth. Landlord shall deliver
             possession of the Premises to Tenant with all of Landlord's
             improvements and Tenant Work completed as required by the terms of
             the Lease and as an integral, enclosed, and secure space with all
             the roof and demising walls properly in place, weather tight and
             free and clear of asbestos and Hazardous Materials, and with all
             service lines and meters in place, ready for occupancy. All of
             Landlord's improvements and Tenant Work shall be done in a good and
             workmanlike manner and in conformity with the local, state and
             national codes having jurisdiction. In addition to the foregoing,
             Landlord agrees to include a provision in every tenant's lease or
             agreement for occupancy in the Building prohibiting such tenant or
             occupant from allowing its employees, agents, contractors or
             invitees from smoking in the Building.

     27.2    No Partnership.  Nothing contained in this Lease shall be deemed or
             ---------------
             construed to create a partnership or joint venture of or between
             Landlord and Tenant, or to create any other relationship between
             Landlord and Tenant other than that of landlord and tenant.

     27.3    Broker.  Landlord and Tenant represent and warrant each to the
             -------
             other that each has not

                                     -25-
<PAGE>

             dealt with any real estate agent or broker in connection with this
             transaction and agree to indemnify and save each other harmless
             from and against all loss, cost and expense incurred by reason of
             the breach of such representation and warranty.

     27.4    Estoppel.  At any time and from time to time upon not less than ten
             ---------
             (10) days' prior notice by Landlord or Tenant, the other party
             shall deliver a statement in writing addressed to the requesting
             party certifying if true (i) that this Lease is unmodified and in
             full force and effect (or if, there have been modifications, that
             the same is in full force and effect as modified and stating the
             modifications), (ii) whether the Term has commenced and the date
             Rent shall have become payable hereunder, and if so, the dates to
             which it has been paid, (iii) whether or not, to such party's
             knowledge, the requesting party is in default in performance of any
             of the terms of this Lease, and if so, specifying such default of
             which it may have knowledge, (iv) whether Tenant has accepted
             possession of the Premises, (v) whether either party has made any
             claim against the other under this Lease, and if so, the nature
             thereof, (vi) whether there exist any offset or defenses against
             enforcement of any of the terms of this Lease upon the part of
             Tenant to be performed, and if so, specifying the same; and (vii)
             such other matters as either party may reasonably request of the
             other.

     27.5    Intentionally Deleted.
             ---------------------

     27.6    Notices.  All notices or other communications hereunder shall be in
             --------
             writing and shall be deemed duly given if delivered in person or
             under the earlier of receipt, if mailed by certified or registered
             mail, or three (3) days after certified or registered mailing,
             return receipt requested, postage prepaid, addressed and sent to
             the respective parties and addresses listed in Sections 1.17, 1.18
             and 1.19 herein. Landlord and Tenant may from time to time by
             written notice to the other designate another address for receipt
             of future notices.

     27.7    Invalidity of Particular Provisions.  If any provisions of this
             ------------------------------------
             Lease or the application thereof to any person or circumstances
             shall to any extent be invalid or unenforceable, the remainder of
             this Lease, or the application of such provision to persons or
             circumstances other than those to which it is invalid or
             unenforceable, shall not be affected thereby, and each provision of
             this Lease shall be valid and be enforced to the full extent
             permitted by law.

     27.8    Gender and Number.  Any terms and words used in this Lease,
             -----------------
             regardless of the number or gender in which they are used, shall be
             deemed to include any other number or gender as the context may
             require.

     27.9    Benefit and Burden.  Subject to the provisions of Article 11 and
             -------------------
             except as otherwise expressly provided, the provisions of this
             Lease shall be binding upon, and shall inure to the benefit of, the
             parties hereto and each of their respective representatives, heirs,
             successors and assigns. Landlord may freely and fully assign its
             interest hereunder provided the successor is bound hereby.

     27.10   Entire Agreement.  This Lease (which includes the Exhibits and
             ----------------
             Rider attached hereto) contains and embodies the entire agreement
             of the parties hereto, and no representations, inducements or
             agreements, oral or otherwise, between the parties not contained in
             this

                                     -26-
<PAGE>

             Lease shall be of any force or effect. This Lease may not be
             modified, changed or terminated in whole or in part in any manner
             other than by an agreement in writing duly signed by Landlord and
             Tenant.

     27.11   Authority.
             ----------

             (i) If Tenant signs as a corporation, Tenant hereby represents and
             warrants that Tenant is a duly formed and validly existing
             corporation, in good standing, qualified to do business in the
             Commonwealth of Virginia, that the corporation has full power and
             authority to enter into this Lease and that the person executing
             the Lease is authorized to execute this Lease on behalf of the
             corporation. Landlord executes this Lease as a Virginia limited
             liability company and represents and warrants that it is duly
             formed, validly existing and in good standing and qualified to do
             business in the Commonwealth of Virginia, that the limited
             liability company has full power and authority to enter into this
             Lease and that the person signing on behalf of the limited
             liability company has the authority to execute the lease on behalf
             of the limited liability company.

     27.12   Attorneys' Fees.  If, as a result of default of Landlord or Tenant
             ----------------
             in its performance of any of the provisions of this Lease, the
             other party uses the services of an attorney in order to secure
             compliance with such provisions or recover damages therefor, or to
             terminate this Lease or evict Tenant, the non-prevailing party
             shall reimburse the prevailing party upon demand for any and all
             reasonable attorneys' fees, costs and expenses so incurred by the
             prevailing party.

     27.13   Interpretation, Venue.  This Lease is governed by the laws of the
             ----------------------
             Commonwealth of Virginia except venue and jurisdiction are proper
             in the Circuit Court for Frederick County, Virginia.

     27.14   No Personal Liability; Sale.  Neither Landlord, Tenant nor their
             ----------------------------
             respective agents, contractors or employees, whether disclosed or
             undisclosed, shall have any personal liability under any provision
             of this Lease. In the event of a judgment in favor of Tenant which
             remains unpaid, Tenant's right of redress, execution and levy shall
             be limited to the interest of Landlord in the Building as described
             in Article 1 hereof. In the event that the original Landlord
             hereunder, or any successor owner of the Building, shall sell or
             convey the Building, all liabilities and obligations on the part of
             the original Landlord, or such successor owner, under this Lease
             occurring thereafter shall terminate as of the day of such sale,
             and thereupon all such liabilities and obligations shall be binding
             on the new owner. Tenant agrees to attorn to such new owner.
             Notwithstanding the foregoing, if Landlord shall fail to perform
             any covenant, term or condition of this Lease upon Landlord's part
             to be performed and should Tenant, as a consequence of such
             default, recover a money judgment against Landlord, such judgment
             may be satisfied out of (i) the proceeds of sale produced upon
             execution of such judgment and levy thereon against Landlord's
             interest in the entire Building and improvements thereon, (ii) the
             rents, other income, or insurance proceeds from such property
             receivable by Landlord and (iii) the consideration received by
             Landlord from the sale of all or any part of Landlord's interest in
             the entire Building. The provisions of this article are not
             designed to relieve Landlord from the performance of any of its
             obligations hereunder, but rather to limit Landlord's liability in
             the case of the recovery of a judgment against it, as aforesaid,
             nor shall any of the provisions of this Article be deemed to limit
             or otherwise affect Tenant's right to

                                     -27-
<PAGE>

            obtain injunctive relief or specific performance or avail itself of
            any other right or remedy which may be accorded Tenant by law or
            this Lease. Notwithstanding anything to the contrary in this Lease,
            Landlord may not transfer its interest in the Building prior to the
            Commencement Date.

     27.15  Time of the Essence.  Time is of the essence as to obligations
            --------------------
            contained in this Lease.

     27.16  Force Majeure. Neither Landlord nor Tenant shall be required to
            -------------
            perform any of its obligations under this Lease, nor shall such
            party be liable for loss or damage for failure to do so, nor shall
            the other party thereby be released from any of its obligations
            under this Lease, where such failure by the non-performing party
            arises from or through acts of God, strikes, lockouts, labor
            difficulties, explosions, sabotage, accidents, riots, civil
            commotions, acts of war, results of any warfare or warlike
            conditions in this or any foreign country, fire or casualty, legal
            requirements, energy shortage or other causes beyond the reasonable
            control of the non-performing party, unless such acts are caused or
            are contributed to by the actions or inactions of the party
            asserting this clause or such loss or damage results from the
            willful misconduct or gross negligence of the non-prevailing party.

     27.17  Headings.  Captions and headings are for convenience of reference
            ---------
            only.

     27.18  Memorandum of Lease. Tenant shall, at the request of Landlord,
            -------------------
            execute and deliver a memorandum of Lease in recordable form. Tenant
            shall not record such a memorandum or this Lease without Landlord's
            consent. In the event Tenant requests recordation of a memorandum of
            this Lease, Tenant shall be obligated to pay all costs, fees and
            taxes , if any, associated with such recordation. In the event
            Landlord elects to record a memorandum of this Lease, Landlord shall
            be obligated to pay all costs, fees and taxes, if any, associated
            with such recordation.

     27.19  Perpetuities. Notwithstanding any provision in this Lease to the
            ------------
            contrary, if the Lease Term has not commenced within twenty-one (21)
            years after the date of this Lease, this Lease shall automatically
            terminate on the 21st anniversary of the date of this Lease. The
            sole purpose of this provision is to avoid any possible
            interpretation of this Lease as violating the Rule Against
            Perpetuities or other rule of law against restraints on alienation.

     27.20  Effectiveness.  The furnishing of the form of this Lease shall not
            --------------
            constitute an offer and this Lease shall become effective upon and
            only upon its execution by and delivery to each party hereto.

     27.21  Option to Purchase.  In the event Landlord desires to sell all or
            ------------------
            any portion of the Building and/or the Premises, or convert the same
            to a condominium regime, Landlord shall first offer the same to
            Tenant. The purchase price shall be at market value as determined in
            good faith by an appraiser selected by the Landlord and an appraiser
            selected by the Tenant. In the event the market appraisals are not
            the same, the purchase price shall be the average of the two
            appraisals. If Tenant does not exercise its right to purchase all or
            any of the above after 60 days notice from Landlord by confirming in
            writing the engagement of an appraiser, then the Landlord shall be
            free to sell same at its sole and absolute discretion.

                                     -28-
<PAGE>

     27.22  Signage/Name.  Tenant agrees to give Landlord the right to name the
            -------------
            Premises and surrounding property "Trex Center". Landlord has the
            sole discretion to change the name at any time provided that Tenant
            is no longer occupying the Premises. Tenant agrees to bear the cost
            for two signs on property so long as the signs bear the name "Trex".
            Landlord agrees to use Trex approved logo and color on all project
            signage.

     27.23  Right of First Offer.  Landlord agrees that during the Lease Term,
            ---------------------
            if space in the Building ("Offering Space") becomes or may become
            available for any reason, Landlord, prior to offering the space to
            any third party, shall notify Tenant in writing of the availability
            of the Offering Space including the estimated date of availability
            ("Landlord's Notice"). In the event Tenant desires to lease such
            Offering Space pursuant to the same terms of the Lease set forth
            herein as they apply to the Premises, Tenant shall provide Landlord
            with written notice of such interest within ten (10) days of the
            receipt of such Landlord's Notice.

     27.24  Right to Renew.  Tenant shall have the right to extend the Term for
            ---------------
            two (2) additional five (5) year terms upon the same terms,
            covenants, and conditions as herein contained. Tenant may exercise
            each such Renewal Period by giving Landlord notice in writing at
            least six (6) months prior to the then scheduled expiration of the
            Term. However, if Tenant fails to give such notice at least six (6)
            months prior to the then scheduled expiration of the Term, Tenant
            shall not be deemed to have waived the right to exercise such
            Renewal Period until Landlord gives Tenant written notice of
            Tenant's failure to exercise such Renewal Period and affords Tenant
            a period of thirty (30) days after receipt of such notice to
            exercise such Renewal Period. Landlord shall give Tenant written
            notice of Tenant's failure to exercise such Renewal Period seven (7)
            months prior to the expiration of the Term.

     IN WITNESS WHEREOF, Landlord and Tenant have executed this Lease under seal
     as of the Date of Lease.

                              LANDLORD:
                              ---------

ATTEST/WITNESS:
---------------               -----------------------------------

                              By: /s/ Kevin D. Adams
                                  --------------------------------
/s/ David A. Scordy           Name:  Kevin D. Adams
---------------------------   Title: Manager

Name: David A. Scordy
     ----------------------

                                     -29-

<PAGE>

ATTEST/WITNESS:                        TENANT:
---------------                        -------

/s/ David A. Scordy     (SEAL)         By: /s/ Robert G. Matheny
---------------------                      ---------------------
Name: David A. Scordy                  Name: Robert G. Matheny

                                       Title: President

                                     -30-

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