<PAGE>

                                 PROMISSORY NOTE

$37,750,000.00                                                New York, New York
                                                              October 1, 2004

        FOR VALUE RECEIVED, BEHRINGER HARVARD TRAVIS TOWER S LP, a Delaware
limited partnership and BEHRINGER HARVARD TRAVIS TOWER H LP, a Delaware limited
partnership, as maker, each having its principal place of business c/o Behringer
Harvard Funds, 15601 Dallas Parkway, Suite 600, Addison, Texas 75001 (together,
"BORROWER"), hereby unconditionally promises to pay to the order of BEAR STEARNS
COMMERCIAL MORTGAGE, INC., a New York corporation, as lender, having an address
at 383 Madison Avenue, New York, New York 10179 ("Lender"), or at such other
place as the holder hereof may from time to time designate in writing, the
principal sum of Thirty-Seven Million Seven Hundred Fifty Thousand and No/100
Dollars ($37,750,000.00), in lawful money of the United States of America with
interest thereon to be computed from the date of this Note at the Applicable
Interest Rate, and to be paid in accordance with the terms of this Note and that
certain Loan Agreement, dated the date hereof, between Borrower and Lender (as
the same may hereafter be amended, restated, replaced, supplemented, renewed,
extended or otherwise modified from time to time, the "LOAN Agreement"). All
capitalized terms not defined herein shall have the respective meanings set
forth in the Loan Agreement.

                                   ARTICLE 1
                                  PAYMENT TERMS

        Borrower agrees to pay the principal sum of this Note and interest on
the unpaid principal sum of this Note from time to time outstanding at the rates
and at the times specified in Article 2 of the Loan Agreement and the
outstanding balance of the principal sum of this Note and all accrued and unpaid
interest thereon shall be due and payable on the Maturity Date.

                                   ARTICLE 2
                            DEFAULT AND ACCELERATION

        The Debt shall without notice become immediately due and payable at the
option of Lender if any payment required in this Note is not paid on or prior to
the date when due or if not paid on the Maturity Date or on the happening of any
other Event of Default.

                                   ARTICLE 3
                                 LOAN DOCUMENTS

        This Note is secured by the Mortgage and the other Loan Documents. All
of the terms, covenants and conditions contained in the Loan Agreement, the
Mortgage and the other Loan Documents are hereby made part of this Note to the
same extent and with the same force as if they were fully set forth herein. In
the event of a conflict or inconsistency between the terms of this Note and the
Loan Agreement, the terms and provisions of the Loan Agreement shall govern.

<PAGE>

                                   ARTICLE 4
                                 SAVINGS CLAUSE

        Notwithstanding anything to the contrary, (a) all agreements and
communications between Borrower and Lender are hereby and shall automatically be
limited so that, after taking into account all amounts deemed interest, the
interest contracted for, charged or received by Lender shall never exceed the
maximum lawful rate or amount, (b) in calculating whether any interest exceeds
the lawful maximum, all such interest shall be amortized, prorated, allocated
and spread over the full amount and term of all principal indebtedness of
Borrower to Lender and (c) if through any contingency or event Lender receives
or is deemed to receive interest in excess of the lawful maximum, any such
excess shall be deemed to have been applied toward payment of the principal of
any and all then outstanding indebtedness of Borrower to Lender.

                                   ARTICLE 5
                                 NO ORAL CHANGE

        This Note may not be modified, amended, waived, extended, changed,
discharged or terminated orally or by any act or failure to act on the part of
Borrower or Lender, but only by an agreement in writing signed by the party
against whom enforcement of any modification, amendment, waiver, extension,
change, discharge or termination is sought.

                                   ARTICLE 6
                                     WAIVERS

        Borrower and all others who may become liable for the payment of all or
any part of the Debt do hereby severally waive presentment and demand for
payment, notice of dishonor, notice of intention to accelerate, notice of
acceleration, protest and notice of protest and non-payment and all other
notices of any kind. No release of any security for the Debt or extension of
time for payment of this Note or any installment hereof, and no alteration,
amendment or waiver of any provision of this Note, the Loan Agreement or the
other Loan Documents made by agreement between Lender or any other Person shall
release, modify, amend, waive, extend, change, discharge, terminate or affect
the liability of Borrower, and any other Person who may become liable for the
payment of all or any part of the Debt, under this Note, the Loan Agreement or
the other Loan Documents. No notice to or demand on Borrower shall be deemed to
be a waiver of the obligation of Borrower or of the right of Lender to take
further action without further notice or demand as provided for in this Note,
the Loan Agreement or the other Loan Documents. If Borrower is a partnership,
the agreements herein contained shall remain in force and be applicable,
notwithstanding any changes in the individuals or entities comprising the
partnership, and the term "Borrower," as used herein, shall include any
alternate or successor partnership, but any predecessor partnership and their
partners shall not thereby be released from any liability. If Borrower is a
corporation, the agreements contained herein shall remain in full force and be
applicable notwithstanding any changes in the shareholders comprising, or the
officers and directors relating to, the corporation, and the term "Borrower" as
used herein, shall include any alternative or successor corporation, but any
predecessor corporation shall not be relieved of liability hereunder. If any
Borrower is a limited liability company, the agreements herein contained shall
remain in force and be applicable, notwithstanding any changes in the members
comprising the limited liability company, and the term "Borrower" as used

                                      -2-
<PAGE>

herein, shall include any alternate or successor limited liability company, but
any predecessor limited liability company and their members shall not thereby be
released from any liability. (Nothing in the foregoing sentence shall be
construed as a consent to, or a waiver of, any prohibition or restriction on
transfers of interests in such partnership, corporation or limited liability
company which may be set forth in the Loan Agreement, the Mortgage or any other
Loan Document.)

                                   ARTICLE 7
                                    TRANSFER

        Upon the transfer of this Note, Borrower hereby waiving notice of any
such transfer, Lender may deliver all the collateral mortgaged, granted, pledged
or assigned pursuant to the Loan Documents, or any part thereof, to the
transferee who shall thereupon become vested with all the rights herein or under
applicable law given to Lender with respect thereto, and Lender shall thereafter
forever be relieved and fully discharged from any liability or responsibility in
the matter; but Lender shall retain all rights hereby given to it with respect
to any liabilities and the collateral not so transferred.

                                   ARTICLE 8
                                   EXCULPATION

        The provisions of Section 9.3 of the Loan Agreement are hereby
incorporated by reference into this Note to the same extent and with the same
force as if fully set forth herein.

                                   ARTICLE 9
                                  GOVERNING LAW

        (A)     THIS NOTE WAS NEGOTIATED IN THE STATE OF NEW YORK, AND MADE BY
BORROWER AND ACCEPTED BY LENDER IN THE STATE OF NEW YORK, AND THE PROCEEDS OF
THIS NOTE WERE DISBURSED FROM THE STATE OF NEW YORK, WHICH STATE THE PARTIES
AGREE HAS A SUBSTANTIAL RELATIONSHIP TO THE PARTIES AND TO THE UNDERLYING
TRANSACTION EMBODIED HEREBY, AND IN ALL RESPECTS, INCLUDING, WITHOUT LIMITING
THE GENERALITY OF THE FOREGOING, MATTERS OF CONSTRUCTION, VALIDITY AND
PERFORMANCE, THIS NOTE AND THE OBLIGATIONS ARISING HEREUNDER SHALL BE GOVERNED
BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK
APPLICABLE TO CONTRACTS MADE AND PERFORMED IN SUCH STATE (WITHOUT REGARD TO
PRINCIPLES OF CONFLICT LAWS) AND ANY APPLICABLE LAW OF THE UNITED STATES OF
AMERICA. TO THE FULLEST EXTENT PERMITTED BY LAW, BORROWER HEREBY UNCONDITIONALLY
AND IRREVOCABLY WAIVES ANY CLAIM TO ASSERT THAT THE LAW OF ANY OTHER
JURISDICTION GOVERNS THIS NOTE AND THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED
IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK PURSUANT TO SECTION 5-1401
OF THE NEW YORK GENERAL OBLIGATIONS LAW.

                                      -3-
<PAGE>

        (B)     ANY LEGAL SUIT, ACTION OR PROCEEDING AGAINST LENDER OR BORROWER
ARISING OUT OF OR RELATING TO THIS NOTE MAY AT LENDER'S OPTION BE INSTITUTED IN
ANY FEDERAL OR STATE COURT IN THE CITY OF NEW YORK, COUNTY OF NEW YORK, PURSUANT
TO SECTION 5-1402 OF THE NEW YORK GENERAL OBLIGATIONS LAW, AND BORROWER WAIVES
ANY OBJECTIONS WHICH IT MAY NOW OR HEREAFTER HAVE BASED ON VENUE AND/OR FORUM
NON CONVENIENS OF ANY SUCH SUIT, ACTION OR PROCEEDING, AND BORROWER HEREBY
IRREVOCABLY SUBMITS TO THE JURISDICTION OF ANY SUCH COURT IN ANY SUIT, ACTION OR
PROCEEDING. BORROWER DOES HEREBY DESIGNATE AND APPOINT:

                                 CT CORPORATION
                                111 EIGHTH AVENUE
                               NEW YORK, NY 10011

AS ITS AUTHORIZED AGENT TO ACCEPT AND ACKNOWLEDGE ON ITS BEHALF SERVICE OF ANY
AND ALL PROCESS WHICH MAY BE SERVED IN ANY SUCH SUIT, ACTION OR PROCEEDING IN
ANY FEDERAL OR STATE COURT IN NEW YORK, NEW YORK, AND AGREES THAT SERVICE OF
PROCESS UPON SAID AGENT AT SAID ADDRESS AND WRITTEN NOTICE OF SAID SERVICE
MAILED OR DELIVERED TO BORROWER IN THE MANNER PROVIDED HEREIN SHALL BE DEEMED IN
EVERY RESPECT EFFECTIVE SERVICE OF PROCESS UPON BORROWER IN ANY SUCH SUIT,
ACTION OR PROCEEDING IN THE STATE OF NEW YORK. BORROWER (I) SHALL GIVE PROMPT
NOTICE TO LENDER OF ANY CHANGED ADDRESS OF ITS AUTHORIZED AGENT HEREUNDER, (II)
MAY AT ANY TIME AND FROM TIME TO TIME DESIGNATE A SUBSTITUTE AUTHORIZED AGENT
WITH AN OFFICE IN NEW YORK, NEW YORK (WHICH SUBSTITUTE AGENT AND OFFICE SHALL BE
DESIGNATED AS THE PERSON AND ADDRESS FOR SERVICE OF PROCESS), AND (III) SHALL
PROMPTLY DESIGNATE SUCH A SUBSTITUTE IF ITS AUTHORIZED AGENT CEASES TO HAVE AN
OFFICE IN NEW YORK, NEW YORK OR IS DISSOLVED WITHOUT LEAVING A SUCCESSOR.

                                   ARTICLE 10
                                     NOTICES

        All notices or other written communications hereunder shall be delivered
in accordance with Section 10.6 of the Loan Agreement.

                                   ARTICLE 11
                                JOINT AND SEVERAL

        If more than one Person has executed this Note as "Borrower", the
obligations of all such Persons hereunder shall be joint and several except as
set forth in the Loan Documents.

                         [NO FURTHER TEXT ON THIS PAGE]

                                      -4-
<PAGE>


        IN WITNESS WHEREOF, Borrower has duly executed this Note as of the day
and year first above written.


                                        BEHRINGER HARVARD TRAVIS TOWER S LP,
                                        a Delaware limited partnership

                                        By: Behringer Harvard Travis Tower S GP,
                                            LLC, a Delaware limited liability
                                            company, its general partner


                                            By:_________________________________
                                               Gerald J. Reihsen, III, Secretary


                                        BEHRINGER HARVARD TRAVIS TOWER H LP,
                                        a Delaware limited partnership

                                        By: Behringer Harvard Travis Tower H GP,
                                            LLC, a Delaware limited liability
                                            company, its general partner


                                            By:_________________________________
                                               Gerald J. Reihsen, III, Secretary