EQC Equity Commonwealth

CommonWealth REIT (NYSE: CWH) today announced that the characterization of dividends for 2013 income tax reporting purposes is as follows:

Common Shares

          Dividend Allocation Per Share       Unrecaptured   Declaration Record Paid/Payable Dividends Ordinary Qualified Capital Section 1250 Return of Dates Dates Dates Per Share Income Dividend Gain Gain Capital 01/10/13 01/22/13 02/21/13 $0.25 $0.0000 $0.0000 $0.0000 $0.0000 $0.2500 04/08/13 04/23/13 05/22/13 $0.25 $0.0000 $0.0000 $0.0000 $0.0000 $0.2500 07/09/13 07/26/13 08/23/13 $0.25 $0.0000 $0.0000 $0.0000 $0.0000 $0.2500 10/09/13 10/25/13 11/22/13 $0.25 $0.0000 $0.0000 $0.0000 $0.0000 $0.2500 TOTALS: $1.00 $0.0000 $0.0000 $0.0000 $0.0000 $1.0000 100.00% 00.00% 0.00% 0.00% 0.00% 100.00%

CWH’s common share CUSIP number is 203233101. This information represents final income allocations.

Preferred D Shares

          Dividend Allocation Per Share       Unrecaptured   Declaration Record Paid/Payable Dividends Ordinary Qualified Capital Section 1250 Return of Dates Dates Dates Per Share Income Dividend Gain Gain Capital 01/10/13 02/01/13 02/15/13 $0.4063 $0.0000 $0.0000 $0.0000 $0.0000 $0.4063 04/08/13 05/01/13 05/15/13 $0.4063 $0.0000 $0.0000 $0.0000 $0.0000 $0.4063 07/09/13 08/01/13 08/15/13 $0.4063 $0.0000 $0.0000 $0.0000 $0.0000 $0.4063 10/09/13 11/01/13 11/15/13 $0.4063 $0.0000 $0.0000 $0.0000 $0.0000 $0.4063 TOTALS: $1.6252 $0.0000 $0.0000 $0.0000 $0.0000 $1.6252 100.00% 00.00% 0.00% 0.00% 0.00% 100.00%

CWH’s Series D preferred share CUSIP number is 203233408. This information represents final income allocations.

Preferred E Shares

        Dividend Allocation Per Share       Unrecaptured   Declaration Record Paid/Payable Dividends Ordinary Qualified Capital Section 1250 Return of Dates Dates Dates Per Share Income Dividend Gain Gain Capital 01/10/13 02/01/13 02/15/13 $0.4531 $0.0000 $0.0000 $0.0000 $0.0000 $0.4531 04/08/13 05/01/13 05/15/13 $0.4531 $0.0000 $0.0000 $0.0000 $0.0000 $0.4531 07/09/13 08/01/13 08/15/13 $0.4531 $0.0000 $0.0000 $0.0000 $0.0000 $0.4531 10/09/13 11/01/13 11/15/13 $0.4531 $0.0000 $0.0000 $0.0000 $0.0000 $0.4531 TOTALS: $1.8124 $0.0000 $0.0000 $0.0000 $0.0000 $1.8124 100.00% 00.00% 0.00% 0.00% 0.00% 100.00%

CWH’s Series E preferred share CUSIP number is 203233606. This information represents final income allocations.

CommonWealth REIT is a real estate investment trust, or REIT, which primarily owns office properties located throughout the United States. CWH is headquartered in Newton, Massachusetts.

A Maryland Real Estate Investment Trust with transferable shares of beneficial interest listed on the New York Stock Exchange.

No shareholder, Trustee or officer is personally liable for any act or obligation of the Trust.

CommonWealth REITTimothy A. Bonang, Vice President, Investor Relations, orJason Fredette, Director, Investor Relations(617) 796-8222www.cwhreit.com