EXHIBIT 10.4

ASSIGNMENT OF REAL ESTATE SALE AGREEMENT

This Assignment of Real Estate Sale Agreement (this “Assignment”) is made to be
effective as of December 12, 2006, by BEHRINGER HARVARD OPPORTUNITY OP I LP, a
Texas limited partnership (“Assignor”), and BEHRINGER HARVARD BENT TREE LP, a
Delaware limited partnership (“Assignee”).

BACKGROUND

A.            Harvard Property Trust, LLC, a Delaware limited liability company
(“HPT”), as Purchaser, entered into that certain Real Estate Sale Agreement
dated as of November 14, 2006 (the “Agreement”), with CMD Realty Investment Fund
II, L.P., an Illinois limited partnership, as Seller, in respect of an office
building having a street address of 17300 Dallas Parkway, Dallas County, Texas.

B.            By that certain Assignment of Real Estate Sale Agreement dated as
of November 14, 2006, HPT assigned its right, title and interest in the
Agreement to Assignor.

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

AGREEMENT

For good and valuable consideration, receipt of which is acknowledged, Assignor
assigns to Assignee all of Assignor’s interest in the Agreement.  Assignee
accepts the assignment and assumes and shall perform all of Assignor’s duties as
Purchaser under the Agreement.

[This space intentionally left blank]

--------------------------------------------------------------------------------

EXECUTED to be effective as of the day and year first above written.

 

 

ASSIGNOR:

 

 

 

 

 

BEHRINGER HARVARD OPPORTUNITY

 

 

OP I LP, a Texas limited partnership

 

 

 

 

 

 By:

 

Behringer Harvard Opportunity REIT I,

 

 

 

 

Inc., Its General Partner

 

 

 

 

 

 

 

 

 

 

 

 

 

 

By:

 

 

 

 

 

Gerald J. Reihsen, III

 

 

 

 

 

Secretary

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ASSIGNEE:

 

 

 

 

 

BEHRINGER HARVARD BENT TREE LP,

 

 

a Delaware limited partnership

 

 

 

 

 

 By:

Behringer Harvard Bent Tree GP, LLC,

 

 

 

Its General Partner

 

 

 

 

 

 

 

 

 

 

 

 

By:

 

 

 

 

Gerald J. Reihsen, III

 

 

 

 

Secretary

 

--------------------------------------------------------------------------------