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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

x                QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2012

OR

o                   TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission File Number 1-9317

COMMONWEALTH REIT

(Exact Name of Registrant as Specified in Its Charter)

617-332-3990

(Registrant’s Telephone Number, Including Area Code)

Indicate by check mark whether the registrant:  (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes x  No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).  Yes x  No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company.  See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.  (Check One):

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  Yes o  No x

Number of registrant’s common shares of beneficial interest, $0.01 par value per share, outstanding as of August 6, 2012: 83,732,451.

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COMMONWEALTH REIT

FORM 10-Q

June 30, 2012

INDEX

References in this Quarterly Report on Form 10-Q to “we”, “us” or “our” refer to CommonWealth REIT and its consolidated subsidiaries, including its majority owned consolidated subsidiary, Select Income REIT and its consolidated subsidiaries, or SIR, unless the context indicates otherwise.

SIR is itself a public company having common shares registered under the Securities Act of 1934, as amended.  For further information about SIR, please see SIR’s periodic reports and other filings with the Securities and Exchange Commission, or SEC, which are available at the SEC’s website at www.sec.gov.  References in this Quarterly Report on Form 10-Q to SIR’s filings with the SEC are included as textual references only, and the information in SIR’s filings with the SEC is not incorporated by reference into this Quarterly Report on Form 10-Q unless otherwise expressly stated herein.

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PART I.                            Financial Information

Item 1.                                   Financial Statements.

COMMONWEALTH REIT

CONDENSED CONSOLIDATED BALANCE SHEETS

(amounts in thousands, except share data)

(unaudited)

See accompanying notes.

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COMMONWEALTH REIT

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(amounts in thousands, except per share data)

(unaudited)

See accompanying notes.

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COMMONWEALTH REIT

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(amounts in thousands)

(unaudited)

See accompanying notes.

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COMMONWEALTH REIT

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(amounts in thousands)

(unaudited)

See accompanying notes.

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COMMONWEALTH REIT

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(dollars in thousands, except per share data)

Note 1.  Basis of Presentation

The accompanying condensed consolidated financial statements of CommonWealth REIT and its subsidiaries, or CWH, we, us or our, have been prepared without audit.  Certain information and footnote disclosures required by U.S. generally accepted accounting principles, or GAAP, for complete financial statements have been condensed or omitted.  We believe the disclosures made are adequate to make the information presented not misleading.  However, the accompanying condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes contained in our Annual Report on Form 10-K for the year ended December 31, 2011, or our Annual Report.  In the opinion of our management, all adjustments, which include only normal recurring adjustments considered necessary for a fair presentation, have been included.  All intercompany transactions and balances with or among our subsidiaries have been eliminated.  Operating results for interim periods are not necessarily indicative of the results that may be expected for the full year.  Reclassifications have been made to the prior years’ financial statements to conform to the current year’s presentation.

The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect reported amounts.  Actual results could differ from those estimates.  Significant estimates in the condensed consolidated financial statements include the allowance for doubtful accounts, purchase price allocations, useful lives of fixed assets and impairment of real estate and intangible assets.

On March 12, 2012, our then wholly owned subsidiary, Select Income REIT, completed an initial public offering of 9,200,000 of its common shares, or the SIR IPO.  We refer to Select Income REIT and its consolidated subsidiaries as SIR.  SIR intends to be taxable as a real estate investment trust, or REIT.  SIR owns substantially all of our commercial and industrial properties located on Oahu, HI as well as 28 suburban office and industrial properties located throughout the mainland United States.  After the SIR IPO, we continue to own 22,000,000 SIR common shares, or approximately 70.5% of SIR’s outstanding common shares, and SIR remains one of our consolidated subsidiaries.  See Note 13 for additional information regarding the SIR IPO.

Note 2.  Recent Accounting Pronouncements

In January 2012, we adopted the Financial Accounting Standards Board, or FASB, Accounting Standards Update No. 2011-04, Amendments to Achieve Common Fair Value Measurements and Disclosure Requirements in U.S. GAAP and IFRS.  This update clarified the application of existing fair value measurement requirements.  This update also required reporting entities to disclose additional information regarding fair value measurements categorized within Level 3 of the fair value hierarchy.  This update was effective for interim and annual reporting periods beginning after December 15, 2011.  The implementation of this update did not cause any material changes to the disclosures in, or presentation of, our condensed consolidated financial statements.

Additionally, in January 2012, we adopted FASB Accounting Standards Update No. 2011-05, Presentation of Comprehensive Income.  This update eliminated the option to report other comprehensive income and its components in the statement of shareholders’ equity.  This update was intended to enhance comparability between entities that report under GAAP and to provide a more consistent method of presenting non-owner transactions that affect an entity’s equity.  This standard was effective for interim and annual reporting periods beginning after December 15, 2011.  The implementation of this update did not cause any material changes to our condensed consolidated financial statements, other than the presentation of the condensed consolidated statements of comprehensive income.

Note 3.  Real Estate Properties

In this Note 3, references to we, us, our or CWH refer to CWH and its consolidated subsidiaries other than SIR and its consolidated subsidiaries, unless noted otherwise.

During the six months ended June 30, 2012, we (including SIR) acquired five properties with a combined 2,594,248 square feet for an aggregate purchase price of $405,500, including the assumption of $176,884 of mortgage debt and excluding closing costs.  We (including SIR) also funded $47,932 of improvements to our properties during the six months ended June 30, 2012.  In addition, since June 30, 2012, SIR acquired three properties with a combined 412,271 square feet for an aggregate purchase price of $46,575, excluding closing costs.  As of August 6, 2012, we (including SIR) have also entered into agreements to acquire seven properties with

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COMMONWEALTH REIT

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

(dollars in thousands, except per share data)

a combined 2,968,822 square feet for an aggregate purchase price of $365,200, including the assumption of approximately $182,600 of mortgage debt and excluding closing costs.  Details of completed acquisitions during 2012 to date are as follows:

Completed Acquisitions:

(1) Purchase price includes the assumption of mortgage debt, if any, and excludes closing costs.

In July 2012, SIR acquired three properties with a combined 412,271 square feet for an aggregate purchase price of $46,575, excluding closing costs.

During the three months ended March 31, 2012, we completed the purchase price allocation on four properties located in Phoenix, AZ with a combined 1,063,364 square feet.  We acquired these properties in March 2011 for an aggregate purchase price of $136,500, excluding closing costs.  Based upon our evaluation of an appraisal prepared by an independent real estate appraisal firm completed in March 2012, we estimated the fair value of the acquired land and buildings and improvements to be $22,614 and $64,104, respectively.  As a result, we retrospectively adjusted the preliminary purchase price allocation by reallocating $8,371 from land to buildings and improvements.  All other allocation amounts were unchanged.

Our and SIR’s Pending Acquisitions:

In May 2012, we entered into an agreement to acquire an office property located in Columbia, SC with 333,708 square feet.  The purchase price is $60,000, including the assumption of approximately $40,600 of mortgage debt and excluding closing costs.  We currently expect to acquire this property during the third quarter of 2012; however, this acquisition is subject to customary closing conditions, including the assumption of existing mortgage debt, and we can provide no assurance that we will acquire this property in that time period or at all.

Also in May 2012, we entered into an agreement to acquire two office properties located in Indianapolis, IN with a combined 1,058,258 square feet.  The aggregate purchase price is $195,500, including the assumption of approximately $116,000 of mortgage debt and excluding closing costs.  We currently expect to acquire these properties during the third quarter of 2012; however, this acquisition is subject to customary closing conditions, including the assumption of existing mortgage debt, and we can provide no assurance that we will acquire these properties in that time period or at all.

In addition, as of August 6, 2012, SIR has entered into agreements to acquire four properties with a combined 1,576,856 square feet for an aggregate purchase price of $109,700, including the assumption of approximately $26,000 of mortgage debt and excluding closing costs.  We understand that SIR currently expects that it will acquire these properties during the remainder of 2012;

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COMMONWEALTH REIT

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

(dollars in thousands, except per share data)

however, these acquisitions are subject to SIR’s satisfactory completion of diligence and other customary closing conditions.  Accordingly, we can provide no assurance that SIR will acquire all or any of these properties in that time period or at all.

Property Sales:

In April 2012, we sold an office property located in Salina, NY with 12,934 square feet for $575, excluding closing costs.  In connection with this sale, we provided mortgage financing to the buyer, an unrelated third party, totaling $419 at 6.0% per annum and recognized a gain on sale of $158.  In June 2012, we sold an office property located in Santa Fe, NM with 76,978 square feet for $1,250, excluding closing costs.  We provided mortgage financing to the buyer, an unrelated third party, totaling $1,000 at 5.0% per annum and recognized a gain on sale of $192.

As of June 30, 2012 and December 31, 2011, none of our properties were classified as held for sale.  We classify all properties probable for sale within one year as held for sale in our condensed consolidated balance sheets.  Results of operations for properties sold or held for sale are included in discontinued operations in our condensed consolidated statements of income, if such results are material.  Results of operations for the properties sold during 2012 are not material to our consolidated results of operations and are not included in discontinued operations.  Prior periods have been restated to reflect 12 office properties and one industrial property reclassified to discontinued operations from continuing operations during the third quarter of 2011, which were sold in 2011, and seven office properties and 20 industrial properties reclassified to continuing operations from discontinued operations during the fourth quarter of 2011.  Summarized income statement information for the three and six months ended June 30, 2011, for properties sold in 2011 is as follows:

Income Statement:

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COMMONWEALTH REIT

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

(dollars in thousands, except per share data)

Note 4.  Investment in Direct Financing Lease

We have an investment in a direct financing lease that relates to a lease with a term that exceeds 75% of the useful life of an office tower located within a mixed use property in Phoenix, AZ.  We recognize income using the effective interest method to produce a level yield on funds not yet recovered.  Estimated unguaranteed residual values at the date of lease inception represent our initial estimates of the fair value of the leased assets at the expiration of the lease, which do not exceed their original cost.  Significant assumptions used in estimating residual values include estimated net cash flows over the remaining lease term and expected future real estate values.  The carrying amount of our net investment is included in other assets in our condensed consolidated balance sheets.  The following table summarizes the carrying amount of our net investment in this direct financing lease:

Additionally, we have determined that no allowance for losses related to our direct financing lease was necessary at June 30, 2012.  Our direct financing lease has an expiration date in 2045.

Note 5.  Equity Investments

At June 30, 2012 and December 31, 2011, we had the following equity investments in Government Properties Income Trust, or GOV, and Affiliates Insurance Company, or AIC (including 100% attribution of SIR’s 12.5% equity ownership interest in AIC):

At June 30, 2012, we owned  9,950,000, or approximately 21.1%, of the common shares of beneficial interest of GOV, with a carrying value of $169,421 and a market value, based on quoted market prices, of $225,069 ($22.62 per share).  GOV is a REIT which primarily owns properties that are majority leased to government tenants and was our wholly owned subsidiary until its initial public offering, or the GOV IPO, in June 2009 when it became a separate public entity.

Since the GOV IPO, we have accounted for our investment in GOV using the equity method.  Under the equity method, we record our percentage share of net earnings of GOV in our condensed consolidated statements of income.  Prior to the GOV IPO, the operating results and investments of GOV were included in our consolidated results of operations and financial position.  The market value of our GOV common shares on the date of the GOV IPO exceeded our carrying value by $13,824.  We are amortizing the difference between our carrying value of GOV and our share of the underlying equity of GOV as of the GOV IPO over a 30 year period, which approximates the remaining useful lives of the properties that we initially contributed to GOV.  If we determine there is an “other than temporary” decline in the fair value of this investment, we would record a charge to earnings.

During the six months ended June 30, 2012 and 2011, we received cash distributions from GOV totaling $8,358 and $8,259, respectively.

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COMMONWEALTH REIT

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

(dollars in thousands, except per share data)

The following summarized financial data of GOV is as reported in GOV’s Quarterly Report on Form 10-Q for the period ended June 30, 2012.  References in our financial statements to the Quarterly Report on Form 10-Q for GOV are included as references to the source of the data only, and the information in GOV’s Quarterly Report on Form 10-Q is not incorporated by reference into our financial statements.

Condensed Consolidated Balance Sheets:

Condensed Consolidated Statements of Income: