Exhibit 10.18

SIXTH AMENDMENT TO REAL ESTATE CONTRACT

This SIXTH AMENDMENT TO REAL ESTATE CONTRACT (hereinafter sometimes referred to as the "Fifth Amendment") is hereby made and entered into as of this 2nd day of
March, 2005, by and between PANATTONI DEVELOPMENT COMPANY, LLC, a California limited liability company, and the sellers listed on the attached Exhibit A (collectively, "Seller"), and DIVIDEND
CAPITAL OPERATING PARTNERSHIP LP, a Delaware limited partnership ("Purchaser").

RECITALS

A.    WHEREAS,
Seller and Purchaser entered into that certain Real Estate Contract dated December 23, 2004, as amended on January 7, 2005, January 21,
2005, February 15, 2005, February 22, 2005 and February 25, 2005 (the "Contract"), regarding those certain real properties more particularly described in the Contract, which are
located in the City of Memphis, County of Shelby, State of Tennessee; and

B.    WHEREAS,
Seller and Purchaser desire to amend the terms of the Contract as hereinafter set forth.

NOW,
THEREFORE, for and in consideration of the sum of the mutual covenants and agreements set forth in this Fifth Amendment, the premises, and other good and valuable consideration, the
receipt, adequacy and sufficiency of which are hereby acknowledged by each of the parties hereto, notwithstanding anything to the contrary contained in the Contract, the parties hereto agree as
follows:



SIGNATURE PAGE

IN WITNESS WHEREOF, the parties have caused this Sixth Amendment to be executed as of the day and year first above written.

| |  | SELLER:                                                                                                                                             
| |  | ----------------------------------------------------------------------------------------------------------------------------------------------------
| |  | PANATTONI DEVELOPMENT COMPANY, LLC, a California limited liability company, for itself and as agent for the sellers listed on the attached Exhibit A
| |  | By:                                                                                                                                                 
| |  | PURCHASER:                                                                                                                                          
| |  | DIVIDEND CAPITAL OPERATING PARTNERSHIP LP, a Delaware limited partnership                                                                           
| |  | By:                                                                                                                                                 
| |  |                                                                                                                                                     
| |  |                                                                                                                                                     
| |  |                                                                                                                                                     



Exhibit A

|Property                             |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|------------------------------------ |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Technicolor II
5140 Memphis Oaks Dr. |  | PANATTONI HOLDINGS, INC., a California corporation, MALONE ROAD 850 DM, LLC, MALONE ROAD 850 CP, LLC, and MALONE ROAD 850 JR, LLC                                                                                                                                                                                                                                                                                                                                                                       
|Shelby 4
4800 Hickory Hill           |  | MERCY CAPITAL CENTER JOINT VENTURE, a California general partnership ("Mercy Capital"), MITCHELL INVESTMENTS, LLC, a Tennessee limited liability company ("Mitchell"),                                                                                                                                                                                                                                                                                                                                  
|Shelby 5                             |  | VAN VALKENBUGH-SHELBY 5, LLC, a Tennessee limited liability company, J & C INVESTMENTS, L.L.C., a California limited liability company ("VV-Shelby 5") and CHARLES KESSINGER                                                                                                                                                                                                                                                                                                                            
|Shelby 19
5166 Pleasant Hill         |  | RIEGER-SHELBY 19, LLC, a Tennessee limited liability company "Rieger-Shelby 19"), PANATTONI-SHELBY 19, LLC, a California limited liability company ("P-Shelby 19"), VANVALKENBURGH-SHELBY 19, LLC, a Tennessee limited liability company ("VV-Shelby 19"),
JAMES F. JORDAN and wife, SUSAN R. JORDAN (collectively "Jordan")                                                                                                                                                                            
|Eastpark I
5300 Hickory Hill         |  | PVV-5300 Hickory Hill, LLC, a Tennessee limited liability company ("PVV"), CARL D. PANATTONI ("CDP"), PANATTONI-5300 HICKORY HILL, LLC, a Tennessee limited liability company ("P-5300"), VAN VALKENBURGH-5300 HICKORY HILL, LLC, a Tennessee limited
liability company ("VV-5300"), PML-5300 HICKORY HILL, LLC, a Tennessee limited liability company ("PML-5300"), RIEGER-5300 HICKORY HILL, LLC, a Tennessee limited liability company ("R-5300"), PANATTONI HOLDINGS, INC., a California
corporation
|Eastpark II
5405 Hickory Hill        |  | PANATTONI-5405 HICKORY HILL, LLC, a Tennessee limited liability company, ("P-5405"), VAN VALKENBURGH-5405 HICKORY HILL, LLC, a Tennessee limited liability company ("VV-5405"), RIEGER-5405 HICKORY HILL, LLC, a Tennessee limited liability company
("R-5405"), MITCHELL-5405 HICKORY HILL, LLC, a Tennessee limited liability company ("M-5405")                                                                                                                                                      
|Shelby 18
5155 Citation Drive        |  | RIEGER-CITATION DRIVE, LLC, a Tennessee limited liability company ("Citation"), VAN VALKENBURGH-CITATION DRIVE, LLC, a Tennessee limited liability company ("VV-Citation"), PANATTONI-CITATION DRIVE, LLC, a Tennessee limited liability company
("P-Citation") and JAMES F. JORDAN and wife, SUSAN R. JORDAN (collectively "Jordan") (together "Seller")                                                                                                                                               



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