Document:

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                  ASSIGNMENT OF AGREEMENT OF SALE AND PURCHASE

        This Assignment of Agreement of Sale and Purchase (this "ASSIGNMENT") is
made as of July ___, 2004, by Realty America Group (1221 coit road), LP, a Texas
limited partnership ("ASSIGNOR"), and Behringer Harvard 1221 coit LP, a Texas
limited partnership ( "ASSIGNEE").

                                   BACKGROUND

        A.      Assignor, as purchaser, entered into that certain Agreement of
Sale and Purchase dated effective as of July 6, 2004 (as same may have been
amended, the "AGREEMENT") with 98 CUSA Plano, L.P., a Delaware limited
partnership, as seller, in respect of an office building commonly known as 1221
Coit Road in Collin County, Texas, as more particularly described in the
Agreement (the "PROPERTY").

        B.      Assignor desires to assign all of its interest in the Agreement
to Assignee and Assignee desires to accept the assignment.

                                    AGREEMENT

        1.      ASSIGNMENT. For good and valuable consideration paid to
Assignor, the receipt and sufficiency of which are hereby acknowledged, Assignor
does hereby ASSIGN AND TRANSFER to Assignee all of the right, title and interest
of Assignor in and to the Agreement. Assignor hereby accepts such assignment and
assumes and agrees to perform all obligations of Assignor as "Purchaser" under
the Agreement.

        2.      DEPOSIT. Assignor has deposited the amount of $25,000 as earnest
money under the Agreement. Upon the execution of this Assignment, Assignee shall
be obligated to cause Behringer Harvard Short-Term Opportunity Fund I LP, a
Texas limited partnership ("BH SHORT TERM"), to deposit the amount of $100,000
in additional earnest money as required by the Agreement. Assignor and BH Short
Term, among others, have executed (or will execute) that certain Agreement of
Limited Partnership of Assignee (the "PARTNERSHIP AGREEMENT"), pursuant to which
each of Assignor and BH Short Term is to contribute certain funds necessary to
acquire the Property. Upon the closing of the transaction that is the subject of
the Agreement, the portion of the Earnest Money belonging to Assignor ($25,000)
shall be credited towards the contribution required to be made by Assignor under
the Partnership Agreement, and the portion of the Earnest Money belonging to BH
Short Term ($100,000) shall be credited towards the contribution required to be
made by BH Short Term under the Partnership Agreement. In the event that
additional earnest money is required to be deposited under the Agreement,
Assignee shall cause BH Short Term to deposit same.

        4.      REPRESENTATIONS. Assignor hereby unconditionally represents and
warrants to, and covenants with, Assignee as follows:

                (a)     The Agreement is in full force and effect. A true,
        correct and complete copy of the Agreement (including all amendments to
        the initial Agreement) is attached hereto as EXHIBIT A.

                (b)     Assignor is not currently in default under the
        Agreement, and, to Assignor's knowledge, no default by Seller exists
        under the Agreement.

                (c)     After the execution of this Assignment, Assignee shall
        have the sole right to exercise any right to terminate the Agreement.

                (d)     Neither Assignor nor any affiliate of Assignor is
        receiving any compensation in connection with the acquisition of the
        Property, other than such compensation as is reflected in

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        documents executed by Assignee or affiliates of Assignee. Without
        limiting the generality of the foregoing, Assignor represents and
        warrants to Assignee that neither Assignor nor any affiliate of Assignor
        has or will receive any commission or other payment from the seller
        named in the Agreement (or any affiliate of such seller) in connection
        with the sale of the Property to Assignee, except as expressly provided
        in the Agreement.

        5.      FURTHER ASSURANCES. Each party agrees that it will without
further consideration execute and deliver such other documents and take such
other action, whether prior or subsequent to Closing, as may be reasonably
requested by the other party to consummate more effectively the purposes or
subject matter of this Agreement.

        6.      ATTORNEYS' FEES. In the event of any controversy, claim or
dispute between the parties affecting or relating to the subject matter or
performance of this Agreement, the prevailing party shall be entitled to recover
from the non-prevailing party all of its reasonable expenses, including
reasonable attorneys' fees.

        7.      COUNTERPARTS. This Agreement may be executed in several
counterparts, and all such executed counterparts shall constitute the same
agreement. It shall be necessary to account for only one such counterpart in
proving this Agreement.

        8.      SEVERABILITY. If any provision of this Agreement is determined
by a court of competent jurisdiction to be invalid or unenforceable, the
remainder of this Agreement shall nonetheless remain in full force and effect.

        9.      APPLICABLE LAW. THIS AGREEMENT IS PERFORMABLE IN DALLAS COUNTY,
TEXAS, AND SHALL IN ALL RESPECTS BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE
WITH, THE SUBSTANTIVE FEDERAL LAWS OF THE UNITED STATES AND THE LAWS OF THE
STATE OF TEXAS.

        10.     CAPTIONS. The section headings appearing in this Agreement are
for convenience of reference only and are not intended, to any extent and for
any purpose, to limit or define the text of any section or any subsection
hereof.

        11.     CONSTRUCTION. The parties acknowledge that the parties and their
counsel have reviewed and revised this Agreement and that the normal rule of
construction to the effect that any ambiguities are to be resolved against the
drafting party shall not be employed in the interpretation of this Agreement or
any exhibits or amendments hereto.

        EXECUTED to be effective as of the date first written above.

                      [This space intentionally left blank]

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                                   ASSIGNOR:

                                   REALTY AMERICA GROUP (1221 COIT ROAD),
                                   L.P., a Texas limited partnership

                                   By:  Realty America Group Investment, LLC,
                                        a Texas limited liability company
                                        Its General Partner

                                        By:_____________________________________
                                        Name:   Webb M. Sowden, III
                                        Title:  Member

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                                   ASSIGNEE:

                                   BEHRINGER HARVARD 1221 COIT LP,
                                   a Texas limited partnership

                                   By:  Behringer Harvard 1221 Coit GP, LLC,
                                        a Texas limited liability company
                                        Its General Partner

                                        By:_____________________________________
                                        Name:___________________________________
                                        Title:__________________________________<PAGE>

               SECOND AMENDMENT TO AGREEMENT OF SALE AND PURCHASE

        THIS SECOND AMENDMENT TO AGREEMENT OF SALE AND PURCHASE (this "Second
Amendment") is entered into to be effective as of the ____ day of August, 2004,
by and between 98 CUSA PLANO, L.P., a Delaware limited partnership ("Seller"),
and BEHRINGER HARVARD 1221 COIT LP, a Texas limited partnership ("Buyer"). All
capitalized terms used herein and not otherwise defined herein shall have the
meanings ascribed to them in the Sale Agreement (defined below).

                                    RECITALS:

                        A.      Seller and Realty America (1221 Coit Road),
                                L.P., a Texas limited partnership ("Original
                                Buyer"), entered into (a) that certain Agreement
                                of Sale and Purchase dated as of July 6, 2004
                                (the "Original Agreement"), pursuant to which
                                Seller agreed to sell to Original Buyer and
                                Original Buyer agreed to purchase the Property
                                described therein; and (b) that certain
                                Reinstatement and First Amendment to Agreement
                                of Sale and Purchase dated as of July 19, 2004
                                (the "First Amendment" together with the
                                Original Agreement the "Sale Agreement").

                                B.      Original Buyer has assigned its rights
                                        under the Sale Agreement to Buyer
                                        pursuant to that certain Assignment of
                                        Agreement of Sale and Purchase, dated as
                                        of July 22, 2004.

                                C.      Seller and Buyer now desire to amend the
                                        Sale Agreement in certain respects, as
                                        hereinafter set forth.

        NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto hereby agree as
follows:

1.              EXTENSION OF CLOSING DATE. Seller and Buyer agree that the
        Closing Date shall be October 4, 2004.

2.              CHANGE IN ESCROW AGENT. Seller and Buyer acknowledge and agree
        that each of the Escrow Agent and the Title Company has been changed to
        Chicago Title Insurance Company, having an address of 2001 Bryan Tower,
        17th Floor, Dallas, Texas 75201.

3.              ADDITIONAL DEPOSIT. No later than two (2) business days after
        the date of this Second Amendment, Buyer shall deliver to (i) Escrow
        Agent an additional deposit of Six Hundred Fifty Thousand and No/100
        Dollars ($650,000.00) (the "Agent Deposit") and (ii) Seller, via wire
        transfer to the account described in Exhibit A attached hereto, an
        additional deposit of Two Hundred Twenty Five Thousand and No/100
        Dollars ($225,000.00) (the "Additional Seller Deposit" together with the
        Agent Deposit, the "Third Deposit"). Upon the making of the Third
        Deposit, Seller will hold at total of $250,000.00 in escrow and Escrow
        Agent will hold a total of $750,000.00 in escrow (plus

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        accrued interest). The Third Deposit shall constitute part of the
        Deposit. Escrow Agent shall hold the Agent Deposit in accordance with
        the terms of the Sale Agreement. Seller shall hold the Additional Seller
        Deposit in accordance with the terms of the Sale Agreement, provided
        Seller shall have no obligation to invest or otherwise segregate the
        Additional Seller Deposit from other funds. The Deposit shall be
        non-refundable to Buyer unless the sale of the Property is not
        consummated due to Seller's default under the Sale Agreement. Unless
        Seller fails to deliver in escrow to Escrow Agent Seller's closing
        documents as more particularly described in Section 9.3 of the Sale
        Agreement ("Seller's Closing Documents"), Escrow Agent is authorized,
        and Buyer hereby directs Escrow Agent, to deliver the Agent Deposit and
        any other amounts on deposit with Escrow Agent, to Seller at 12:00 p.m.
        Central Time on the Closing Date. Buyer acknowledges that Buyer has no
        further rights to terminate the Sale Agreement for any reason, including
        without limitation pursuant to Section 10.2.2 of the Sale Agreement for
        any casualty or condemnation of the Property, the risk of all losses
        having passed to Buyer.

4.              EFFECT OF AMENDMENT. This Second Amendment modifies and amends
        the Sale Agreement and the terms and provisions hereof shall supersede
        and control over any contrary or conflicting terms and provisions set
        forth in the Sale Agreement. The Sale Agreement, as amended by this
        Second Amendment, remains in full force and effect.

5.              COUNTERPARTS. To facilitate execution of this Second Amendment,
        this Second Amendment may be executed in multiple counterparts, each of
        which, when assembled to include an original signature for each party
        contemplated to sign this Second Amendment, will constitute a complete
        and fully executed original. All such fully executed original
        counterparts will collectively constitute a single agreement.

6.              FACSIMILE SIGNATURES. In order to expedite the transaction
        contemplated herein, telecopied or facsimile signatures may be used in
        place of original signatures on this Second Amendment. Seller and Buyer
        intend to be bound by the signatures on the telecopied document, are
        aware that the other party will rely on the telecopied signatures, and
        hereby waive any defenses to the enforcement of the terms of this Second
        Amendment based on the form of signature.

        IN WITNESS WHEREOF, the parties hereto have executed this Second
Amendment to be effective the date and year first above written.

                            [SIGNATURE PAGE FOLLOWS]

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                                   SELLER:

                                   98 CUSA PLANO, L.P.
                                   a Delaware limited partnership

                                   By:  98 CUSA Plano GP, L.L.C., a Delaware
                                        limited liability company

                                        By: Wolverine Net Lease GP Company, a
                                            Texas corporation, its administrator

                                            By:_________________________________
                                            Name:_______________________________
                                            Title:______________________________

                                   BUYER:

                                   BEHRINGER HARVARD 1221 COIT LP,
                                   a Texas limited partnership

                                   By:  Behringer Harvard 1221 Coit GP, LLC,
                                        a Texas limited liability company,
                                        its general partner

                                        By:_____________________________________
                                        Name:___________________________________
                                        Title:__________________________________

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                                    Exhibit A

                               Wiring Instructions
                         NLP Net Lease Properties, L.P.

Bank Name:              Bank of America

ABA #:                  111000025

Credit to:              NLP Net Lease Properties, L.P.

Account #:              004771132984

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