Equity Commonwealth Watch

from 10-K 22 pages Description of the Company’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934

from 10-K 22 pages Description of the Company’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934

from 10-K 22 pages Description of the Company’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934

from 10-K 22 pages Description of the Company’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934

from 10-K 22 pages Description of the Company’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934

from S-3ASR 60 pages Equity Commonwealth, as Issuer — And — [ ] as Trustee Form of Indenture Dated as of [ ] Subordinated Debt Securities Certain Sections of This Indenture Relating to the Trust Indenture Act of 1939

from S-3ASR 57 pages Equity Commonwealth, as Issuer — And — [ ] as Trustee Form of Indenture Dated as of [ ] Senior Debt Securities Certain Sections of This Indenture Relating to the Trust Indenture Act of 1939

from 10-Q 2 pages Indenture or similar

from 8-K 3 pages Amendment No. 2 to Renewed Rights Agreement

from 8-K 4 pages Amendment No. 1 to Renewed Rights Agreement

from 8-K 14 pages Registration Agreement Between Select Income REIT and Commonwealth REIT March 25, 2013 Registration Agreement

from 8-K 12 pages Registration Agreement Between Government Properties Income Trust and Commonwealth REIT March 11, 2013 Registration Agreement

from 10-K 2 pages Indenture or similar

from 10-K 2 pages Indenture or similar

from 10-K 2 pages Common a Maryland Real Estate Investment Trust See Reverse for Important Notice on Transfer Restrictions and Other Information Cusip 203233 10 1 This Certifies That Is the Registered Holder of Fully Paid and Nonassessable Common Shares of Beneficial Interest in Commonwealth REIT a Maryland Real Estate Investment Trust (The “Trust”), Transferable on the Books of the Trust by the Holder Hereof in Person or by Its Duly Authorized Attorney Upon Surrender of This Certificate Properly Endorsed. This Certificate and the Shares Evidenced Hereby Are Issued and Shall Be Held Subject to All of the Provisions of the Declaration of Trust and Bylaws of the Trust and Any Amendments Thereto. the Holder of This Certificate and Every Transferee or Assignee Hereof by Accepting or Holding the Same Agrees to Be Bound by All of the Provisions of the Declaration of Trust and Bylaws of the Trust, as Amended From Time to Time. This Certificate Is Not Valid Unless Countersigned and Registered by the Transfer Agent and Registrar. in Witness Whereof, the Trust Has Caused This Certificate to Be Executed on Its Behalf by Its Duly Authorized Officers. Dated: Managing Trustee and President Treasurer and Chief Financial Officer Countersigned and Registered: Wells Fargo Bank, N.A. Transfer Agent and Registrar by Authorized Signature U American Financial Printing Incorporated – Minneapolis the Declaration of Trust Provides That the Name “Commonwealth REIT” Refers to the Trustees Under the Declaration of Trust, Collectively as Trustees, but Not Individually or Personally, and No Trustee, Shareholder, Employee or Agent of the Trust Shall Be Held to Any Personal Liability, Jointly or Severally, in Connection With This Instrument. All Persons Dealing With the Trust in Any Way Shall Look Only to the Assets of the Trust for Payment of Any Sum or Performance of Any Obligation. Common Shares $.01 Par Value Per Share Common Shares $.01 Par Value Per Share

from 8-A12B 16 pages Supplemental Indenture No. 21 by and Between Commonwealth REIT and U.S. Bank National Association as of July 25, 2012 Supplemental to the Indenture Dated as of July 9, 1997 Commonwealth REIT 5.75% Senior Notes Due 2042

from 8-K 16 pages Supplemental Indenture No. 21 by and Between Commonwealth REIT and U.S. Bank National Association as of July 25, 2012 Supplemental to the Indenture Dated as of July 9, 1997 Commonwealth REIT 5.75% Senior Notes Due 2042

from 8-K 2 pages Indenture or similar

from 10-Q 17 pages Supplemental Indenture No. 20 by and Between Commonwealth REIT and U.S. Bank National Association as of September 17, 2010 Supplemental to the Indenture Dated as of July 9, 1997 Commonwealth REIT 5.875% Senior Notes Due 2020

from 8-K 2 pages Indenture or similar