CommonWealth REIT (NYSE: CWH) (“CommonWealth”) today announced that its Board of Trustees has determined that the best interests of CommonWealth will be served by CommonWealth continuing the common share offering and debt tender offer previously announced on February 25, 2013. The Board of Trustee’s decision was made after considering the Schedule 13D that was jointly filed on February 26, 2013 by Corvex Management LP (“Corvex”) and Related Fund Management, LLC (“Related”) with the Securities and Exchange Commission and a separate “open letter” published by Corvex and Related. The company has included two open letters published by Corvex and Related as exhibits to a Form 8-K it filed today. The Corvex and Related documents mentioned above are not the Company’s documents and the Company does not endorse or confirm, and is not responsible for, their content. Reference to these Corvex and Related documents is intended only to provide context to today’s announcement. This press release is neither an offer to sell nor a solicitation of an offer to buy CommonWealth common shares, nor shall there by any sale of these securities in any state or jurisdiction in which the offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of such state or jurisdiction. The preliminary prospectus supplement relating to this offering and related prospectus have been filed with the Securities and Exchange Commission and copies can be obtained by contacting the offices of Citigroup, c/o Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, NY 11717, telephone: (800) 831-9146; BofA Merrill Lynch, Attn: Prospectus Department, 222 Broadway, New York, NY 10038; email firstname.lastname@example.org; UBS Investment Bank, Attn. Prospectus Department, 299 Park Avenue, New York, NY 10171, telephone (888) 827-7275; or Morgan Stanley, Attn: Prospectus Department, 180 Varick Street, 2 nd floor, New York, NY 10014, telephone (866) 718-1649; email: email@example.com. This press release is neither an offer to buy nor a solicitation of an offer to sell any of CommonWealth’s outstanding senior notes which are the subject of the tender offer CommonWealth announced on February 25, 2013 (the “Senior Notes”). Citigroup Global Markets Inc. and RBC Capital Markets, LLC are the Dealer Managers for that tender offer. Investors with questions regarding the tender offer may contact Citigroup Global Markets Inc. at (800) 558-3745 (toll-free) or (212) 723-6106 (collect) and RBC Capital Markets, LLC at (877) 381-2099 (toll-free) or (212) 618-7822 (collect). Global Bondholder Services Corp. is the tender agent and information agent for the Offer and can be contacted at (212) 430-3774 or (866) 952-2200 (toll-free).