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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of

The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): March 31, 2011

KBS REAL ESTATE INVESTMENT TRUST II, INC.

(Exact name of registrant specified in its charter)

620 Newport Center Drive, Suite 1300

Newport Beach, California 92660

(Address of principal executive offices)

Registrant’s telephone number, including area code: (949) 417-6500

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant

under any of the following provisions:

¨  Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨  Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨  Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨  Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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ITEM 8.01    OTHER EVENTS

This Current Report on Form 8-K is being filed by KBS Real Estate Investment Trust II, Inc. (the “Company”) to present the financial statements for the probable acquisition of the real property described below as well as the related pro forma financial statements for the Company. These financial statements are being filed on Form 8-K in order to be incorporated by reference into the Company’s registration statements.

On March 31, 2011, the Company, through an indirect wholly owned subsidiary, entered into a purchase and sale agreement to acquire an 18-story office building containing 295,933 rentable square feet located in West Palm Beach, Florida (“CityPlace Tower”) for a purchase price of approximately $126.5 million plus closing costs.

ITEM 9.01    FINANCIAL STATEMENTS AND EXHIBITS

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Stockholders of

KBS Real Estate Investment Trust II, Inc.

We have audited the accompanying statement of revenues over certain operating expenses of CityPlace Tower for the year ended December 31, 2010. This statement is the responsibility of CityPlace Tower’s management. Our responsibility is to express an opinion on the statement based on our audit.

We conducted our audit in accordance with the auditing standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the statement of revenues over certain operating expenses is free of material misstatement. We were not engaged to perform an audit of CityPlace Tower’s internal control over financial reporting. Our audit included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of CityPlace Tower’s internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the statement of revenues over certain operating expenses, assessing the accounting principles used and significant estimates made by management, and evaluating the overall presentation of the statement of revenues over certain operating expenses. We believe that our audit provides a reasonable basis for our opinion.

The accompanying statement of revenues over certain operating expenses was prepared for the purpose of complying with the rules and regulations of the Securities and Exchange Commission, as described in Note 2 to the statement, and is not intended to be a complete presentation of CityPlace Tower’s revenues and expenses.

In our opinion, the statement of revenues over certain operating expenses referred to above presents fairly, in all material respects, the revenues and certain operating expenses, as described in Note 2 to the statement, of CityPlace Tower for the year ended December 31, 2010, in conformity with U.S. generally accepted accounting principles.

New York, New York

April 4, 2011

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CITYPLACE TOWER

STATEMENT OF REVENUES OVER CERTAIN OPERATING EXPENSES

(in thousands)

See accompanying notes.

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CITYPLACE TOWER

NOTES TO STATEMENT OF REVENUES OVER CERTAIN OPERATING EXPENSES

For the Year Ended December 31, 2010

On March 31, 2011, KBS Real Estate Investment Trust II, Inc. (“KBS REIT II”), through an indirect wholly owned subsidiary, entered into a purchase and sale agreement to acquire an 18-story office building containing 295,933 rentable square feet located in West Palm Beach, Florida (“CityPlace Tower”) from Cityplace Office I, L.L.C. (the “Seller”). The Seller is not affiliated with KBS REIT II or its advisor, KBS Capital Advisors LLC. CityPlace Tower is located on approximately 1.25 acres of land. The purchase price of CityPlace Tower is $126.5 million plus closing costs. KBS REIT II intends to fund the purchase of CityPlace Tower with proceeds from its initial public offering. Pursuant to the purchase and sale agreement, KBS REIT II would be obligated to purchase CityPlace Tower only after satisfactory completion of agreed upon closing conditions. There can be no assurance that KBS REIT II will complete the acquisition. KBS REIT II has made deposits of $5.0 million, and in some circumstances, if KBS REIT II fails to complete the acquisition, it may forfeit up to $5.0 million of earnest money.

KBS REIT II is a Maryland corporation formed to invest in and manage a diverse portfolio of real estate properties located throughout the United States and real estate-related investments.

The accompanying statement of revenues over certain operating expenses has been prepared to comply with the rules and regulations of the Securities and Exchange Commission (“SEC”).

CityPlace Tower is not a legal entity and the accompanying statement of revenues over certain operating expenses is not representative of the actual operations for the period presented, as certain revenues and expenses have been excluded that may not be comparable to the revenues and expenses KBS REIT II expects to incur in the future operations of CityPlace Tower. Excluded items include interest, depreciation and amortization, and general and administrative costs not directly comparable to the future operations of CityPlace Tower.

An audited statement of revenues over certain operating expenses is being presented for the most recent fiscal year available instead of the three most recent years based on the following factors: (i) CityPlace Tower will be acquired from an unaffiliated party and (ii) based on due diligence of CityPlace Tower by KBS REIT II, management is not aware of any material factors relating to CityPlace Tower that would cause this financial information not to be indicative of future operating results.

Square footage, acreage, occupancy and other measures used to describe real estate included in these notes to the statement of revenues over certain operating expenses are presented on an unaudited basis.

Rental Revenues

Minimum rent, including rental abatements and contractual fixed increases attributable to operating leases, is recognized on a straight-line basis over the term of the related lease and amounts expected to be received in later years are recorded as deferred rent. The adjustment to record deferred rent increased rental revenue by approximately $1.3 million for the year ended December 31, 2010.

Use of Estimates

The preparation of the statement of revenues over certain operating expenses, as described in Note 2 and in conformity with U.S. generally accepted accounting principles, requires management to make estimates and assumptions that affect the reported amounts of revenues and expenses during the reporting period. Actual results could materially differ from those estimates.

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CITYPLACE TOWER

NOTES TO STATEMENT OF REVENUES OVER CERTAIN OPERATING EXPENSES (CONTINUED)

For the Year Ended December 31, 2010

As of December 31, 2010, CityPlace Tower was 80% leased to 17 tenants. For the year ended December 31, 2010, CityPlace Tower earned approximately 44% of its rental income from three tenants in the following industries: financial services, health care and social services and legal services.

The tenant in the financial services industry occupies 50,284 square feet, or approximately 17% of the total rentable square feet. This tenant’s lease expires on August 31, 2019, with two five-year extension options. For the year ended December 31, 2010, CityPlace Tower earned 22% of its rental income from this tenant.

The tenant in the health care and social services industry occupies 29,812 square feet, or approximately 10% of the total rentable square feet. This tenant’s lease expires on September 30, 2019, with two five-year extension options. Subject to certain conditions, the tenant has an option to terminate its lease after September 15, 2015, subject to a termination fee. For the year ended December 31, 2010, CityPlace Tower earned 11% of its rental income from this tenant.

The tenant in the legal industry occupies 26,597 square feet, or approximately 9% of the total rentable square feet. This tenant’s lease expires on January 31, 2019, with two five-year extension options. This tenant has the one-time option to expand the size of its leased space between 4,500 and 6,500 square feet no later than May 27, 2012, the fourth anniversary of its rent commencement. This tenant also has the one-time option to reduce the size of its leased space by up to 20% effective any time after May 27, 2013, subject to a termination fee. For the year ended December 31, 2010, CityPlace Tower earned 11% of its rental income from this tenant.

No other tenant leases represented more than 10% of rental income for the year ended December 31, 2010.

As of December 31, 2010, expected future minimum rental receipts due under operating leases for the years ending December 31 were as follows (in thousands):

Tenant Lease Termination Options

Certain tenants have lease termination options built into their leases, which are subject to termination fees. In the event that a tenant does exercise its option to terminate its lease early and the terminated space is not subsequently leased out, the total amount of future minimum rent received by CityPlace Tower will be reduced.

Environmental

CityPlace Tower is subject to various environmental laws of federal, state and local governments. Compliance with existing environmental laws is not expected to have a material adverse effect on CityPlace Tower’s financial condition or results of operations.

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CITYPLACE TOWER

NOTES TO STATEMENT OF REVENUES OVER CERTAIN OPERATING EXPENSES (CONTINUED)

For the Year Ended December 31, 2010

KBS REIT II evaluates subsequent events up until the date the statement of revenues over certain operating expenses is issued. The accompanying statement of revenues over certain operating expenses was issued on April 4, 2011.

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KBS REAL ESTATE INVESTMENT TRUST II, INC.

SUMMARY OF UNAUDITED PRO FORMA FINANCIAL STATEMENTS

The following pro forma information should be read in conjunction with the consolidated balance sheets of KBS Real Estate Investment Trust II, Inc. (“KBS REIT II”) as of December 31, 2010, the related consolidated statements of operations, stockholders’ equity, and cash flows for the year then ended, and the notes thereto. The consolidated financial statements of KBS REIT II as of and for the year ended December 31, 2010 have been included in KBS REIT II’s Annual Report on Form 10-K for the year ended December 31, 2010, filed with the SEC. In addition, this pro forma information should be read in conjunction with the statements of revenues over certain operating expenses and the notes thereto of the 300 N. LaSalle Building, the Union Bank Plaza, Granite Tower, National City Tower and I-81 Industrial Portfolio, which have been filed with the SEC, and the statement of revenues over certain operating expenses and the notes thereto of CityPlace Tower, which is included herein.

The following unaudited pro forma balance sheet as of December 31, 2010 has been prepared to give effect to the acquisitions of I-81 Industrial Portfolio and CityPlace Tower as if the acquisitions occurred on December 31, 2010.

The following unaudited pro forma statement of operations for the year ended December 31, 2010 has been prepared to give effect to the acquisitions of (i) the 300 N. LaSalle Building acquired on July 29, 2010, (ii) Union Bank Plaza acquired on September 15, 2010, (iii) Granite Tower acquired on December 16, 2010, (iv) National City Tower acquired on December 17, 2010 and (v) I-81 Industrial Portfolio acquired on February 16, 2011 and the probable acquisition of CityPlace Tower, all as if the acquisitions occurred on January 1, 2010.

These unaudited pro forma financial statements are prepared for informational purposes only and are not necessarily indicative of future results or of actual results that would have been achieved had the acquisitions of the 300 N. LaSalle Building, the Union Bank Plaza, Granite Tower, National City Tower, I-81 Industrial Portfolio and CityPlace Tower been consummated as of January 1, 2010. The audited statement of revenues over certain operating expenses of the 300 N. LaSalle Building has been previously filed on Form 8-K/A with the SEC on September 27, 2010, the audited statement of revenues over certain operating expenses of the Union Bank Plaza has been previously filed on Form 8-K/A with the SEC on November 23, 2010, the audited statement of revenues over certain operating expenses of Granite Tower has been previously filed on Form 8-K with the SEC on January 27, 2011, the audited statement of revenues over certain operating expenses of National City Tower has been previously filed on Form 8-K with the SEC on January 27, 2011, and the audited statement of revenues over certain operating expenses of I-81 Industrial Portfolio was filed on Form 8-K with the SEC on April 1, 2011. The audited statement of revenues over certain operating expenses of CityPlace Tower is included herein. In addition, the pro forma balance sheet includes pro forma preliminary estimates of the fair value of the assets and liabilities acquired in connection with the acquisition. These preliminary estimates may be adjusted in the future upon finalization of the purchase accounting.

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KBS REAL ESTATE INVESTMENT TRUST II, INC.

UNAUDITED PRO FORMA BALANCE SHEET

As of December 31, 2010

(in thousands, except share and per share amounts)

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KBS REAL ESTATE INVESTMENT TRUST II, INC.

NOTES TO UNAUDITED PRO FORMA BALANCE SHEET

As of December 31, 2010

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KBS REAL ESTATE INVESTMENT TRUST II, INC.

UNAUDITED PRO FORMA STATEMENT OF OPERATIONS

For the Year Ended December 31, 2010

(in thousands, except share and per share amounts)

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KBS REAL ESTATE INVESTMENT TRUST II, INC.

NOTES TO UNAUDITED PRO FORMA STATEMENT OF OPERATIONS

For the Year Ended December 31, 2010

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