<SEC-DOCUMENT>0001140361-17-019768-index.html : 20170511
<SEC-HEADER>0001140361-17-019768.hdr.sgml : 20170511
<ACCEPTANCE-DATETIME>20170511162445
ACCESSION NUMBER:		0001140361-17-019768
CONFORMED SUBMISSION TYPE:	SC 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20170511
DATE AS OF CHANGE:		20170511

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CoreSite Realty Corp
		CENTRAL INDEX KEY:			0001490892
		STANDARD INDUSTRIAL CLASSIFICATION:	REAL ESTATE INVESTMENT TRUSTS [6798]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-85695
		FILM NUMBER:		17834605

	BUSINESS ADDRESS:	
		STREET 1:		1001 17TH STREET
		STREET 2:		SUITE 500
		CITY:			DENVER
		STATE:			CO
		ZIP:			80202
		BUSINESS PHONE:		(866) 777-2673

	MAIL ADDRESS:	
		STREET 1:		1001 17TH STREET
		STREET 2:		SUITE 500
		CITY:			DENVER
		STATE:			CO
		ZIP:			80202

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			HEITMAN REAL ESTATE SECURITIES LLC
		CENTRAL INDEX KEY:			0001080117
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		191 N. WACKER DR.
		STREET 2:		SUITE 2500
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60606
		BUSINESS PHONE:		3128555700

	MAIL ADDRESS:	
		STREET 1:		191 N. WACKER DR.
		STREET 2:		SUITE 2500
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60606

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	HEITMAN PRA SECURITIES ADVISORS LLC
		DATE OF NAME CHANGE:	19990218
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>formsc13ga.htm
<DESCRIPTION>SC 13G/A
<TEXT>
Document 1 - file: formsc13ga.htm

</DOCUMENT>
</SEC-DOCUMENT>