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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">UNITED STATES</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">SECURITIES AND EXCHANGE COMMISSION</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">WASHINGTON, DC&#160; 20549</font></b></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">FORM&nbsp;8-K</font></b></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">CURRENT REPORT PURSUANT</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">TO SECTION&nbsp;13 OR 15(d)&nbsp;OF THE</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">SECURITIES EXCHANGE ACT OF 1934</font></b></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date of report (Date of earliest event reported): <b>September&nbsp;13, 2013</b></font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">COMMONWEALTH REIT</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Exact Name of Registrant as Specified in Its Charter)</font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Maryland</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(State or Other Jurisdiction of Incorporation)</font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">1-9317</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">04-6558834</font></b></p>    </td>   </tr>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Commission File Number)</font></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(IRS Employer Identification No.)</font></p>    </td>   </tr>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Two Newton Place, 255   Washington Street, <br>   Suite&nbsp;300, Newton, Massachusetts</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">02458-1634</font></b></p>    </td>   </tr>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">(617) 332-3990</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Registrant&#146;s Telephone Number,&nbsp;Including Area Code)</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Check the appropriate box below if the Form&nbsp;8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Written communications pursuant to Rule&nbsp;425 under   the Securities Act (17 CFR 230.425)</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Soliciting material pursuant to Rule&nbsp;14a-12 under   the Exchange Act (17 CFR 240.14a-12)</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pre-commencement communications pursuant to   Rule&nbsp;14d-2(b)&nbsp;under the Exchange Act (17 CFR 240.14d-2(b))</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pre-commencement communications pursuant to   Rule&nbsp;13e-4(c)&nbsp;under the Exchange Act (17 CFR 240.13e-4(c))</font></p>    </td>   </tr>  </table>
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<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 8.01.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; Other Events.</font></b></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">On September&nbsp;13, 2013, CommonWealth REIT, or the Company, issued a press release announcing that it will redeem all of its outstanding 5.75% Senior Notes due 2014 at a redemption price equal to the principal amount of $99,043,000, plus accrued and unpaid interest to the date of redemption. This redemption is expected to occur on or about October&nbsp;18, 2013. A copy of the Company&#146;s press release is attached hereto as Exhibit&nbsp;99.1.</font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">WARNING REGARDING FORWARD LOOKING STATEMENTS</font></b></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">THIS CURRENT REPORT ON FORM&nbsp;8-K CONTAINS FORWARD LOOKING STATEMENTS WITHIN THE MEANING OF THE PRIVATE SECURITIES LITIGATION REFORM&nbsp;ACT OF 1995 AND OTHER SECURITIES LAWS. THESE FORWARD LOOKING STATEMENTS ARE BASED UPON THE COMPANY&#146;S PRESENT EXPECTATIONS, BUT THESE STATEMENTS ARE NOT GUARANTEED. FOR EXAMPLE:</font></p>
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<p style="margin:0in 0in .0001pt 55.0pt;text-indent:-20.0pt;"><font size="2" face="Symbol" style="font-size:10.0pt;">&#183;</font><b><font size="1" style="font-size:3.0pt;font-weight:bold;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font></b><font size="2" style="font-size:10.0pt;">THIS CURRENT REPORT ON FORM&nbsp;8-K STATES THAT THE COMPANY EXPECTS TO REDEEM ALL OF ITS OUTSTANDING 5.75% SENIOR NOTES DUE 2014. IF UNFORESEEN CIRCUMSTANCES OCCUR, THE EXPECTED REDEMPTION OF 5.75% SENIOR NOTES DUE 2014 MAY&nbsp;NOT BE COMPLETED.</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">FOR THESE REASONS, AMONG OTHERS,&nbsp;INVESTORS SHOULD NOT PLACE UNDUE RELIANCE UPON ANY FORWARD LOOKING STATEMENT.</font></p>
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<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 9.01.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; Financial Statements and Exhibits.</font></b></p>
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<p style="margin:0in 0in .0001pt;"><i><font size="2" face="Times New Roman" style="font-size:10.0pt;font-style:italic;">(d)&nbsp; Exhibits.</font></i></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Press   Release dated September&nbsp;13, 2013.</font></p>    </td>   </tr>  </table>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2<a name="PB_2_181552_5796"></a></font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">SIGNATURES</font></b></p>
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<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">COMMONWEALTH   REIT</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/   John C. Popeo</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Name:</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">John   C. Popeo</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Treasurer   and Chief Financial Officer</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date:&nbsp; September&nbsp;16, 2013</font></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3<a name="PB_3_182033_2897"></a></font></p>
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{"company-data": {"conformed-name": "CommonWealth REIT", "cik": "0000803649", "assigned-sic": "6798", "irs-number": "046558834", "state-of-incorporation": "MD", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-09317", "film-number": "131098525"}, "business-address": {"street1": "TWO NEWTON PLACE", "street2": "255 WASHINGTON STREET", "city": "NEWTON", "state": "MA", "zip": "02458", "phone": "6177968350"}, "mail-address": {"street1": "TWO NEWTON PLACE", "street2": "255 WASHINGTON STREET", "city": "NEWTON", "state": "MA", "zip": "02458"}, "former-company": [{"former-conformed-name": "HRPT PROPERTIES TRUST", "date-changed": "19980701"}, {"former-conformed-name": "HEALTH & RETIREMENT PROPERTIES TRUST", "date-changed": "19940811"}, {"former-conformed-name": "HEALTH & REHABILITATION PROPERTIES TRUST", "date-changed": "19920703"}]}
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC  20549
FORM 8-K
CURRENT REPORT PURSUANT
TO SECTION 13 OR 15(d) OF THE
SECURITIES EXCHANGE ACT OF 1934
Date of report (Date of earliest event reported):
September 13, 2013
COMMONWEALTH REIT
(Exact Name of Registrant as Specified in Its Charter)
Maryland
(State or Other Jurisdiction of Incorporation)
1-9317
04-6558834
(Commission File Number)
(IRS Employer Identification No.)
Two Newton Place, 255   Washington Street,
Suite 300, Newton, Massachusetts
02458-1634
(Address of Principal Executive Offices)
(Zip Code)
(617) 332-3990
(Registrant's Telephone Number, Including Area Code)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
o
Written communications pursuant to Rule 425 under   the Securities Act (17 CFR 230.425)
o
Soliciting material pursuant to Rule 14a-12 under   the Exchange Act (17 CFR 240.14a-12)
o
Pre-commencement communications pursuant to   Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
o
Pre-commencement communications pursuant to   Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Item 8.01.             Other Events.
On September 13, 2013, CommonWealth REIT, or the Company, issued a press release announcing that it will redeem all of its outstanding 5.75% Senior Notes due 2014 at a redemption price equal to the principal amount of $99,043,000, plus accrued and unpaid interest to the date of redemption. This redemption is expected to occur on or about October 18, 2013. A copy of the Company's press release is attached hereto as Exhibit 99.1.
WARNING REGARDING FORWARD LOOKING STATEMENTS
THIS CURRENT REPORT ON FORM 8-K CONTAINS FORWARD LOOKING STATEMENTS WITHIN THE MEANING OF THE PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995 AND OTHER SECURITIES LAWS. THESE FORWARD LOOKING STATEMENTS ARE BASED UPON THE COMPANY'S PRESENT EXPECTATIONS, BUT THESE STATEMENTS ARE NOT GUARANTEED. FOR EXAMPLE:
·
THIS CURRENT REPORT ON FORM 8-K STATES THAT THE COMPANY EXPECTS TO REDEEM ALL OF ITS OUTSTANDING 5.75% SENIOR NOTES DUE 2014. IF UNFORESEEN CIRCUMSTANCES OCCUR, THE EXPECTED REDEMPTION OF 5.75% SENIOR NOTES DUE 2014 MAY NOT BE COMPLETED.
FOR THESE REASONS, AMONG OTHERS, INVESTORS SHOULD NOT PLACE UNDUE RELIANCE UPON ANY FORWARD LOOKING STATEMENT.
Item 9.01.             Financial Statements and Exhibits.
(d)  Exhibits.
99.1
Press   Release dated September 13, 2013.
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SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
COMMONWEALTH   REIT
By:
/s/   John C. Popeo
Name:
John   C. Popeo
Title:
Treasurer   and Chief Financial Officer
Date:  September 16, 2013
3