Exhibit 10.30

AMENDMENT NO. 3

TO

ADVISORY AGREEMENT

This amendment no. 3 to that certain Advisory Agreement dated as of November 8,
2005 (the “Advisory Agreement”) between KBS Real Estate Investment Trust, Inc.,
a Maryland corporation (the “Company”), and KBS Capital Advisors LLC, a Delaware
limited liability company (the “Advisor”), is entered as of October 18, 2006
(the “Amendment”). This Amendment supersedes and replaces Amendment No. 2 to the
Advisory Agreement dated as of August 8, 2006. Capitalized terms used herein but
not defined shall have the meaning set forth in the Advisory Agreement.

WHEREAS, upon the terms set forth in this Amendment, the Advisor has agreed to
advance the Company a portion of the Operating Expenses that the Company has
incurred through the date hereof and agreed to be repaid this advance only upon
the terms set forth below.

NOW, THEREFORE, in consideration of the foregoing and of the mutual covenants
and agreements contained herein, the parties hereto agree as follows:

Notwithstanding anything contained in Article 9 of the Advisory Agreement to the
contrary, the Advisor hereby agrees to advance funds (the “Advance”) to the
Company equal to the cumulative amount of distributions declared by the Company
for the period ending November 30, 2006 less the amount of the Company’s funds
from operations (as defined by NAREIT) from January 1, 2006 through November 30,
2006, provided that in no event will the amount of the Advance be more than the
cumulative amount of distributions declared by the Company for the period ending
November 30, 2006. Advisor further agrees that the Company will only be
obligated to reimburse the Advisor for the Advance if and to the extent that the
Company’s cumulative funds from operations for the period commencing January 1,
2006 through the date of any such reimbursement exceed the lesser of (i) the
cumulative amount of any distributions declared and payable to the Company’s
Stockholders as of the date of such reimbursement or (ii) an amount that is
equal to a 7.0% cumulative, non-compounded, annual return on Invested Capital
for the Company’s Stockholders for the period from July 18, 2006 through the
date of such reimbursement. Advisor understands and agrees that no interest
shall accrue on the Advance being made under this Amendment.

Signature page follows.

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IN WITNESS WHEREOF, the parties hereto have executed this Amendment as of the
date and year first above written.

 

KBS REAL ESTATE INVESTMENT TRUST, INC. By:   /s/ Charles J. Schreiber, Jr.  
Charles J. Schreiber, Jr., Chief Executive Officer KBS CAPITAL ADVISORS LLC By:
  Schreiber Real Estate Investments, L.P., a Manager   By:   Schreiber
Investments, LLC, as general partner     By:   /s/ Charles J. Schreiber, Jr.    
  Charles J. Schreiber, Jr., Manager