<SEC-DOCUMENT>0000803649-18-000024-index.html : 20180620
<SEC-HEADER>0000803649-18-000024.hdr.sgml : 20180620
<ACCEPTANCE-DATETIME>20180620162227
ACCESSION NUMBER:		0000803649-18-000024
CONFORMED SUBMISSION TYPE:	S-3ASR
PUBLIC DOCUMENT COUNT:		8
FILED AS OF DATE:		20180620
DATE AS OF CHANGE:		20180620
EFFECTIVENESS DATE:		20180620

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Equity Commonwealth
		CENTRAL INDEX KEY:			0000803649
		STANDARD INDUSTRIAL CLASSIFICATION:	REAL ESTATE INVESTMENT TRUSTS [6798]
		IRS NUMBER:				046558834
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		S-3ASR
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-225755
		FILM NUMBER:		18909648

	BUSINESS ADDRESS:	
		STREET 1:		TWO NORTH RIVERSIDE PLAZA
		STREET 2:		SUITE 2100
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60606
		BUSINESS PHONE:		312.646.2800

	MAIL ADDRESS:	
		STREET 1:		TWO NORTH RIVERSIDE PLAZA
		STREET 2:		SUITE 2100
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60606

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CommonWealth REIT
		DATE OF NAME CHANGE:	20100702

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	HRPT PROPERTIES TRUST
		DATE OF NAME CHANGE:	19980701

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	HEALTH & RETIREMENT PROPERTIES TRUST
		DATE OF NAME CHANGE:	19940811
</SEC-HEADER>
<DOCUMENT>
<TYPE>S-3ASR
<SEQUENCE>1
<FILENAME>eqc-sx32018.htm
<DESCRIPTION>S-3ASR
<TEXT>
Document 1 - file: eqc-sx32018.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>2
<FILENAME>eqcshelf-hl51opinion.htm
<DESCRIPTION>EXHIBIT 5.1
<TEXT>
Document 2 - file: eqcshelf-hl51opinion.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-8.1
<SEQUENCE>3
<FILENAME>eqc-sx3ex81taxopinionjune2.htm
<DESCRIPTION>EXHIBIT 8.1
<TEXT>
Document 3 - file: eqc-sx3ex81taxopinionjune2.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-12.1
<SEQUENCE>4
<FILENAME>eqcs-3exhibit121.htm
<DESCRIPTION>EXHIBIT 12.1
<TEXT>
Document 4 - file: eqcs-3exhibit121.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>5
<FILENAME>eyconsentex231.htm
<DESCRIPTION>EXHIBIT 23.1
<TEXT>
Document 5 - file: eyconsentex231.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>eqcs3ex51taxopinion_image1.jpg
<TEXT>
Document 6 - file: eqcs3ex51taxopinion_image1.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>eqcs3ex81taxopinionju_image1.jpg
<TEXT>
Document 7 - file: eqcs3ex81taxopinionju_image1.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>logoa02.jpg
<TEXT>
Document 8 - file: logoa02.jpg

</DOCUMENT>
</SEC-DOCUMENT>