ADVISORY AGREEMENT

Exhibit 10.64

ADVISORY AGREEMENT

between

KBS REAL ESTATE INVESTMENT TRUST, INC.

and

KBS CAPITAL ADVISORS LLC

November 8, 2007

TABLE OF CONTENTS

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ADVISORY AGREEMENT

This Advisory Agreement, dated as of November 8, 2007 (the “Agreement”), is between KBS Real Estate Investment Trust, Inc., a Maryland corporation (the “Company”), and KBS Capital Advisors LLC, a Delaware limited liability company (the “Advisor”).

WITNESSETH

WHEREAS, the Company desires to avail itself of the knowledge, experience, sources of information, advice, assistance and certain facilities available to the Advisor and to have the Advisor undertake the duties and responsibilities hereinafter set forth, on behalf of, and subject to the supervision of, the Board of Directors of the Company, all as provided herein; and

WHEREAS, the Advisor is willing to undertake to render such services, subject to the supervision of the Board of Directors of the Company, on the terms and conditions hereinafter set forth.

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

ARTICLE 1

DEFINITIONS

The following defined terms used in this Agreement shall have the meanings specified below:

“Acquisition Expenses” means any and all expenses, excluding the fee payable to the Advisor pursuant to Section 8.01, incurred by the Company, the Advisor or any Affiliate of either in connection with the selection, acquisition or development of any property or other potential investment, whether or not acquired, including, without limitation, legal fees and expenses, travel and communications expenses, costs of appraisals, nonrefundable option payments on properties or other investments not acquired, accounting fees and expenses, and title insurance premiums.

“Acquisition Fees” means the fee payable to the Advisor pursuant to Section 8.01 plus all other fees and commissions paid by any Person to any Person in connection with making or investing in any Property, Loan or other Permitted Investment or the purchase, development or construction of Property by the Company. Included in the computation of such fees or commissions shall be any real estate commission, selection fee, Development Fee, Construction Fee, nonrecurring management fee, loan fees or points or any fee of a similar nature, however designated. Excluded shall be Development Fees and Construction Fees paid to Persons not Affiliated with the Advisor in connection with the actual development and construction of a Property.

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“Advance” shall have the meaning set forth in Article 16.

“Advisor” means (i) KBS Capital Advisors LLC, a Delaware limited liability company, or (ii) any successor advisor to the Company.

“Affiliate or Affiliated.” An Affiliate of another Person includes any of the following: (i) any Person directly or indirectly controlling, controlled by, or under common control with such other Person; (ii) any Person directly or indirectly owning, controlling, or holding with the power to vote 10% or more of the outstanding voting securities of such other Person; (iii) any legal entity for which such Person acts as an executive officer, director, trustee, or general partner; (iv) any Person 10% or more of whose outstanding voting securities are directly or indirectly owned, controlled, or held, with power to vote, by such other Person; and (v) any executive officer, director, trustee, or general partner of such other Person. An entity shall not be deemed to control or be under common control with an Advisor-sponsored program unless (i) the entity owns 10% or more of the voting equity interests of such program or (ii) a majority of the board (or equivalent governing body) of such program is comprised of Affiliates of the entity.

“Appraised Value” means the value according to an appraisal made by an Independent Appraiser.

“Articles of Incorporation” means the Articles of Incorporation of the Company under Title 2 of the Corporations and Associations Article of the Annotated Code of Maryland, as amended from time to time.

“Asset Management Fee” shall have the meaning set forth in Section 8.02.

“Average Invested Assets” means, for a specified period, the average of the aggregate book value of the assets of the Company invested, directly or indirectly, in Properties, Loans and other Permitted Investments secured by real estate before reserves for depreciation or bad debts or other similar non-cash reserves, computed by taking the average of such values at the end of each month during such period.

“Board of Directors or Board” means the persons holding such office, as of any particular time, under the Articles of Incorporation of the Company, whether they be the Directors named therein or additional or successor Directors.

“Bylaws” means the bylaws of the Company, as amended from time to time.

“Cash from Financings” means the net cash proceeds realized by the Company from the financing of Properties, Loans or other Permitted Investments or from the refinancing of any Company indebtedness (after deduction of all expenses incurred in connection therewith).

“Cash from Sales” means the net cash proceeds realized by the Company from the sale, exchange or other disposition of any of its assets after deduction of all expenses incurred in connection therewith. In the case of a transaction described in clause (i) (C) of

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the definition of “Sale,” Cash From Sales means the proceeds of any such transaction actually distributed to the Company from the Joint Venture or partnership. Cash from Sales shall not include Cash from Financings.

“Cash from Sales and Financings” means the total sum of Cash from Sales and Cash from Financings.

“Code” means the Internal Revenue Code of 1986, as amended from time to time, or any successor statute thereto. Reference to any provision of the Code shall mean such provision as in effect from time to time, as the same may be amended, and any successor provision thereto, as interpreted by any applicable regulations as in effect from time to time.

“Company” means KBS Real Estate Investment Trust, Inc., a corporation organized under the laws of the State of Maryland.

“Competitive Real Estate Commission” means a real estate or brokerage commission for the purchase or sale of property that is reasonable, customary, and competitive in light of the size, type, and location of the property.

“Conflicts Committee” shall have the meaning set forth in the Company’s Articles of Incorporation.

“Construction Fee” means a fee or other remuneration for acting as general contractor and/or construction manager to construct improvements, supervise and coordinate projects or to provide major repairs or rehabilitation on a Property.

“Contract Sales Price” means the total consideration received by the Company for the sale of a Property, Loan or other Permitted Investment.

“Cost of JV Investment” shall equal the product of (i) the amount actually paid or allocated to the purchase, development, construction or improvement of Properties by the New Leaf – KBS JV, LLC, inclusive of expenses related thereto, and the amount of any outstanding debt associated with such Properties and the venture and (ii) the percentage that represents the Company’s economic interest in New Leaf – KBS JV, LLC.

“Cost of Real Estate Investments” means the sum of (i) with respect to Properties wholly owned, directly or indirectly, by the Company, the amount actually paid or allocated to the purchase, development, construction or improvement of Properties, inclusive of expenses related thereto, plus the amount of any outstanding debt attributable to such Properties and (ii) in the case of Properties owned by any Joint Venture or partnership in which the Company is a co-venturer or partner, the portion of the amount actually paid or allocated to the purchase, development, construction or improvement of Properties, inclusive of expenses related thereto, plus the amount of any outstanding debt associated with such Properties that is attributable to the Company’s investment in the Joint Venture or partnership.

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“Dealer Manager” means (i) KBS Capital Markets Group LLC, a Delaware limited liability company, or (ii) any successor dealer manager to the Company.

“Development Fee” means a fee for the packaging of a Property, including negotiating and approving plans, and undertaking to assist in obtaining zoning and necessary variances and necessary financing for the Property, either initially or at a later date.

“Director” means a member of the Board of Directors of the Company.

“Disposition Fee” shall have the meaning set forth in Section 8.03.

“Distributions” means any distributions of money or other property by the Company to owners of Shares, including distributions that may constitute a return of capital for federal income tax purposes.

“GAAP” means accounting principals generally accepted in the United States.

“Gross Proceeds” means the aggregate purchase price of all Shares sold for the account of the Company through an Offering, without deduction for Organization and Offering Expenses.

“Independent Appraiser” means a person or entity with no material current or prior business or personal relationship with the Advisor or the Directors, who is engaged to a substantial extent in the business of rendering opinions regarding the value of assets of the type held by the Company, and who is a qualified appraiser of real estate as determined by the Board. Membership in a nationally recognized appraisal society such as the American Institute of Real Estate Appraisers (“M.A.I.”) or the Society of Real Estate Appraisers (“S.R.E.A.”) shall be conclusive evidence of such qualification.

“Invested Capital” means the amount calculated by multiplying the total number of Shares purchased by Stockholders by the issue price, reduced by any amounts paid by the Company to repurchase Shares pursuant to the Company’s plan for redemption of Shares.

“Joint Venture” means any joint venture, limited liability company or other Affiliate of the Company that owns, in whole or in part, on behalf of the Company any Properties, Loans or other Permitted Investments.

“Listed” or “Listing” shall have the meaning set forth in the Company’s Articles of Incorporation.

“Loans” means mortgage loans and other types of debt financing purchased by the Company, including, without limitation, mezzanine loans, B-notes, bridge loans, convertible mortgages, wraparound mortgage loans, construction mortgage loans, loans on leasehold interests and participations in such loans.

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“NASAA Guidelines” means the NASAA Statement of Policy Regarding Real Estate Investment Trusts as in effect on the date hereof.

“New Leaf-KBS Management Fee” has the meaning set forth in Section 8.02(ii).

“Net Income” means, for any period, the total revenues applicable to such period, less the total expenses applicable to such period excluding additions to reserves for depreciation, bad debts or other similar non-cash reserves; provided, however, Net Income for purposes of calculating total allowable Operating Expenses (as defined herein) shall exclude the gain from the sale of the Company’s assets.

“Offering” means any offering of Shares that is registered with the SEC, excluding Shares offered under any employee benefit plan.

“Operating Cash Flow” means Operating Revenue Cash Flows minus the sum of (i) Operating Expenses, (ii) all principal and interest payments on indebtedness and other sums paid to lenders, (iii) the expenses of raising capital such as Organization and Offering Expenses, legal, audit, accounting, underwriting, brokerage, listing, registration, and other fees, printing and other such expenses and tax incurred in connection with the issuance, distribution, transfer, registration and Listing of the Shares, (iv) taxes, (v) incentive fees paid in compliance with Section IV.F. of the NASAA Guidelines and (vi) Acquisition Fees, Acquisition Expenses, real estate commissions on resale of property, and other expenses connected with the acquisition, disposition, and ownership of real estate interests, mortgage loans or other property (such as the costs of foreclosure, insurance premiums, legal services, maintenance, repair and improvement of property).

“Operating Expenses” means all costs and expenses incurred by the Company, as determined under GAAP, which in any way are related to the operation of the Company or to Company business, including fees paid to the Advisor, but excluding (i) the expenses of raising capital such as Organization and Offering Expenses, legal, audit, accounting, underwriting, brokerage, listing, registration, and other fees, printing and other such expenses and tax incurred in connection with the issuance, distribution, transfer, registration and Listing of the Shares, (ii) interest payments, (iii) taxes, (iv) non-cash expenditures such as depreciation, amortization and bad loan reserves, (v) incentive fees paid in compliance with Section IV.F. of the NASAA Guidelines and (vi) Acquisition Fees, Acquisition Expenses, real estate commissions on resale of property, and other expenses connected with the acquisition, disposition, and ownership of real estate interests, mortgage loans or other property (such as the costs of foreclosure, insurance premiums, legal services, maintenance, repair and improvement of property).

“Operating Revenue Cash Flows” means the Company’s cash flow from ownership and operation of Properties, Loans, interests in Properties owned by any Joint Venture or partnership in which the Company is a co-venturer or partner, Permitted Investments, and short-term investments.

“Organization and Offering Expenses” means all expenses incurred by or on behalf of the Company in connection with and in preparing the Company for registration

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of and subsequently offering and distributing its Shares to the public, whether incurred before or after the date of this Agreement, which may include but are not limited to, total underwriting and brokerage discounts and commissions (including fees of the underwriters’ attorneys); any expense allowance granted by the Company to the underwriter or any reimbursement of expenses of the underwriter by the Company; expenses for printing, engraving and mailing; salaries of employees while engaged in sales activity; charges of transfer agents, registrars, trustees, escrow holders, depositaries and experts; and expenses of qualification of the sale of the securities under Federal and State laws, including taxes and fees, accountants’ and attorneys’ fees.

“Partnership” means KBS Limited Partnership, a Delaware limited partnership formed to own and operate Properties, Loans and other Permitted Investments on behalf of the Company.

“Performance Fee” has the meaning set forth in Section 8.02(ii).

“Permitted Investments” means all investments (other than Properties, Loans and interests in Properties owned by any Joint Venture or partnership in which the Company is a co-venturer or partner) that the Company may acquire pursuant to its Articles of Incorporation, Bylaws and the investment objectives and policies adopted by the Board of Directors of the Company from time to time, other than short-term investments acquired for purposes of cash management.

“Person” means an individual, corporation, partnership, estate, trust (including a trust qualified under Section 401(a) or 501(c) (17) of the Code), a portion of a trust permanently set aside for or to be used exclusively for the purposes described in Section 642(c) of the Code, association, private foundation within the meaning of Section 509(a) of the Code, joint stock company or other entity, or any government or any agency or political subdivision thereof, and also includes a group as that term is used for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended.

“Property or Properties” means any real property or properties transferred or conveyed to the Company or the Partnership, either directly or indirectly, and/or any real property or properties transferred or conveyed to a Joint Venture or partnership in which the Company is a co-venturer or partner.

“Property Manager” means an entity that has been retained to perform and carry out at one or more of the Properties property-management services, excluding persons, entities or independent contractors retained or hired to perform facility management or other services or tasks at a particular Property, the costs for which are passed through to and ultimately paid by the tenant at such Property.

“Registration Statement” means the registration statement filed by the Company with the SEC on Form S-11 (Reg. No. 333-126087), as amended from time to time, in connection with the initial public offering of the Company’s Shares.

“REIT” means a “real estate investment trust” under Sections 856 through 860 of the Code.

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“Sale or Sales” means (i) any transaction or series of transactions whereby: (A) the Company or the Partnership sells, grants, transfers, conveys, or relinquishes its ownership of any Property, Loan or other Permitted Investment or portion thereof, including the transfer of any Property that is the subject of a ground lease, and including any event with respect to any Property, Loan or other Permitted Investment that gives rise to a significant amount of insurance proceeds or condemnation awards; (B) the Company or the Partnership sells, grants, transfers, conveys, or relinquishes its ownership of all or substantially all of the interest of the Company or the Partnership in any Joint Venture or partnership which it is a co-venturer or partner; or (C) any Joint Venture or partnership (in which the Company or the Partnership as a co-venturer or partner) sells, grants, transfers, conveys, or relinquishes its ownership of any Property, Loan or other Permitted Investment or portion thereof, including any event with respect to any Property, Loan or other Permitted Investment that gives rise to insurance claims or condemnation awards, but (ii) not including any transaction or series of transactions specified in clause (i) (A), (i) (B), or (i) (C) above in which the proceeds of such transaction or series of transactions are reinvested in one or more Properties, Loans or other Permitted Investments within 180 days thereafter.

“SEC” means the United States Securities and Exchange Commission.

“Shares” means the shares of common stock of the Company, par value $.01 per share.

“Stockholders” means the registered holders of the Shares.

“Stockholders’ 8% Return” means, as of any date, an aggregate amount equal to an 8% cumulative, non-compounded, annual return on Invested Capital (calculated like simple interest on a daily basis based on a three hundred sixty-five day year). For purposes of calculating the Stockholders’ 8% Return, Invested Capital shall be determined for each day during the period for which the Stockholders’ 8% Return is being calculated and shall be calculated net of (1) Distributions of Operating Cash Flow to the extent such Distributions of Operating Cash Flow provide a cumulative, non-compounded, annual return in excess of 8%, as such amounts are computed on a daily basis based on a three hundred sixty-five day year and (2) Distributions of Cash from Sales and Financings, except to the extent such Distributions would be required to supplement Distributions of Operating Cash Flow in order to achieve a cumulative, non-compounded, annual return of 8%, as such amounts are computed on a daily basis based on a three hundred sixty-five day year.

“Subordinated Incentive Fee” means the fee payable to the Advisor under certain circumstances if the Shares are Listed, as calculated in Section 8.05.

“Subordinated Performance Fee Due Upon Termination” means a fee payable in the form of an interest bearing promissory note (the “Performance Fee Note”) in a principal amount equal to (1) 15% of the amount, if any, by which (a) the Appraised Value of the Company’s Properties at the Termination Date, less amounts of all indebtedness secured by the Company’s Properties, plus the fair market value of all other

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Loans and Permitted Investments of the Company at the Termination Date, less amounts of indebtedness related to such Loans and Permitted Investments, plus total Distributions (excluding any stock dividend) through the Termination Date exceeds (b) the sum of Invested Capital plus total Distributions required to be made to the stockholders in order to pay the Stockholders’ 8% Return from inception through the Termination Date less (2) any prior payment to the Advisor of a Subordinated Share of Cash Flows. Interest on the Performance Fee Note will accrue beginning on the Termination Date at a rate deemed fair and reasonable by the Conflicts Committee. The Company shall repay the Performance Fee Note at such time as the Company completes the first Sale after the Termination Date using Cash from Sales. If the Cash from Sales from the first Sale after the Termination Date is insufficient to pay the Performance Fee Note in full, including accrued interest, then the Performance Fee Note shall be paid in part from the Cash from Sales from the first Sale, and in part from the Cash From Sales from each successive Sale until the Performance Fee Note is repaid in full, with interest. If the Performance Fee Note has not been paid in full within five years from the Termination Date, then the Advisor, its successors or assigns, may elect to convert the balance of the fee, including accrued but unpaid interest, into Shares at a price per Share equal to the average closing price of the Shares over the ten trading days immediately preceding the date of such election if the Shares are Listed at such time. If the Shares are not Listed at such time, the Advisor, its successors or assigns, may elect to convert the balance of the fee, including accrued but unpaid interest, into Shares at a price per Share equal to the fair market value for the Shares as determined by the Board of Directors based upon the Appraised Value of Company’s Properties on the date of election plus the fair market value of all other Loans and Permitted Investments of the Company on the date of election.

“Subordinated Share of Cash Flows” has the meaning set forth in Section 8.04.

“Termination Date” means the date of termination of the Agreement determined in accordance with Article 13 hereof.

“2%/25% Guidelines” means the requirement pursuant to the NASAA Guidelines that, in any period of four consecutive fiscal quarters, total Operating Expenses not exceed the greater of 2% of the Company’s Average Invested Assets during such 12-month period or 25% of the Company’s Net Income over the same 12-month period.

“7% Return” has the meaning set forth in Section 8.02(ii).

ARTICLE 2

APPOINTMENT

The Company hereby appoints the Advisor to serve as its advisor and asset manager on the terms and conditions set forth in this Agreement, and the Advisor hereby accepts such appointment.

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ARTICLE 3

DUTIES OF THE ADVISOR

The Advisor is responsible for managing, operating, directing and supervising the operations and administration of the Company and its assets. The Advisor undertakes to use its best efforts to present to the Company potential investment opportunities and to provide the Company with a continuing and suitable investment program consistent with the investment objectives and policies of the Company as determined and adopted from time to time by the Board of Directors. Subject to the limitations set forth in this Agreement, including Article 4 hereof, and the continuing and exclusive authority of the Board of Directors over the management of the Company, the Advisor shall, either directly or by engaging an Affiliate or third party, perform the following duties:

3.01 Organizational and Offering Services. The Advisor shall perform all services related to the organization of the Company or any Offering or private sale of the Company’s securities other than services that (i) are to be performed by the Dealer Manager, (ii) the Company elects to perform directly or (iii) would require the Advisor to register as a broker-dealer with the SEC or any state.

3.02 Acquisition Services.

(i) Serve as the Company’s investment and financial advisor and provide relevant market research and economic and statistical data in connection with the Company’s assets and investment objectives and policies;

(ii) Subject to Section 4 hereof and the investment objectives and policies of the Company: (a) locate, analyze and select potential investments; (b) structure and negotiate the terms and conditions of transactions pursuant to which investments in Properties, Loans and other Permitted Investments will be made; (c) acquire Properties, Loans and other Permitted Investments on behalf of the Company; (d) arrange for financing and refinancing and make other changes in the asset or capital structure of investments in Properties, Loans and other Permitted Investments; and (e) enter into leases, service contracts and other agreements for Properties;

(iii) Perform due diligence on prospective investments and create due diligence reports summarizing the results of such work;

(iv) Prepare reports regarding prospective investments that include recommendations and supporting documentation necessary for the Directors to evaluate the proposed investments;

(v) Obtain reports (which may be prepared by the Advisor or its Affiliates), where appropriate, concerning the value of contemplated investments of the Company;

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(vi) Deliver to or maintain on behalf of the Company copies of all appraisals obtained in connection with the Company’s investments; and

(vii) Negotiate and execute approved investments and other transactions.

3.03 Asset Management Services.

(i) Real Estate Services:

(a) Investigate, select and, on behalf of the Company, engage and conduct business with (including enter contracts with) such Persons as the Advisor deems necessary to the proper performance of its obligations as set forth in this Agreement, including but not li