KBS Real Estate Investment Trust 10-Q 2008 Q2 Quarterly report

Exhibit 32.2

Certification pursuant to 18 U.S.C. Section 1350,

as Adopted pursuant to Section 906 of the

Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report on Form 10-Q of KBS Real Estate Investment Trust, Inc. (the “Registrant”) for the quarter ended June 30, 2008, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned, Stacie K. Yamane, the Chief Financial Officer and Controller of the Registrant, hereby certifies, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that, to the best of her knowledge and belief:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

Date: August 14, 2008

/s/ Stacie K. Yamane

Stacie K. Yamane

Chief Financial Officer and Controller