UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

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¨ Preliminary Proxy Statement

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¨ Definitive Proxy Statement

x Definitive Additional Materials

¨ Soliciting Material Pursuant to §240.14a-12

COMMONWEALTH REIT

(Name of the Registrant as Specified In Its Charter)

CORVEX MANAGEMENT LP

KEITH MEISTER

RELATED FUND MANAGEMENT, LLC

RELATED REAL ESTATE RECOVERY FUND GP-A, LLC

RELATED REAL ESTATE RECOVERY FUND GP, L.P.

RELATED REAL ESTATE RECOVERY FUND, L.P.

RRERF ACQUISITION, LLC

JEFF T. BLAU

RICHARD O’TOOLE

DAVID R. JOHNSON

JAMES CORL

EDWARD GLICKMAN

PETER LINNEMAN

JIM LOZIER

KENNETH SHEA

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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Additional Information Regarding the Solicitation

Corvex Management LP and Related Fund Management, LLC have filed a definitive solicitation statement with the Securities and Exchange Commission (the “SEC”) to (1) solicit consents to remove the entire board of trustees of CommonWealth REIT (the “Removal Proposal”), and (2) elect five new trustees at a special meeting of shareholders that must be promptly called in the event that the Removal Proposal is successful. Investors and security holders are urged to read the definitive solicitation statement and other relevant documents because they contain important information regarding the solicitation. The definitive solicitation statement and all other relevant documents are available, free of charge, on the SEC’s website at www.sec.gov.