<SEC-DOCUMENT>0001193125-21-341764-index.html : 20211129
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<ACCEPTANCE-DATETIME>20211129070116
ACCESSION NUMBER:		0001193125-21-341764
CONFORMED SUBMISSION TYPE:	SC TO-T
PUBLIC DOCUMENT COUNT:		13
FILED AS OF DATE:		20211129
DATE AS OF CHANGE:		20211129

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 TO-T
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-85695
		FILM NUMBER:		211452776

	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:			AMERICAN TOWER CORP /MA/
		CENTRAL INDEX KEY:			0001053507
		STANDARD INDUSTRIAL CLASSIFICATION:	REAL ESTATE INVESTMENT TRUSTS [6798]
		IRS NUMBER:				650723837
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC TO-T

	BUSINESS ADDRESS:	
		STREET 1:		116 HUNTINGTON AVE
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116
		BUSINESS PHONE:		6173757500

	MAIL ADDRESS:	
		STREET 1:		116 HUNTINGTON AVE
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	AMERICAN TOWER SYSTEMS CORP
		DATE OF NAME CHANGE:	19980128
</SEC-HEADER>
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<TYPE>SC TO-T
<SEQUENCE>1
<FILENAME>d207949dsctot.htm
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<TEXT>
Document 1 - file: d207949dsctot.htm

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<DOCUMENT>
<TYPE>EX-99.(A)(1)(A)
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<FILENAME>d207949dex99a1a.htm
<DESCRIPTION>EX-(A)(1)(A)
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Document 2 - file: d207949dex99a1a.htm

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<TYPE>EX-99.(A)(1)(B)
<SEQUENCE>3
<FILENAME>d207949dex99a1b.htm
<DESCRIPTION>EX-(A)(1)(B)
<TEXT>
Document 3 - file: d207949dex99a1b.htm

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<DOCUMENT>
<TYPE>EX-99.(A)(1)(C)
<SEQUENCE>4
<FILENAME>d207949dex99a1c.htm
<DESCRIPTION>EX-(A)(1)(C)
<TEXT>
Document 4 - file: d207949dex99a1c.htm

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<TYPE>EX-99.(A)(1)(D)
<SEQUENCE>5
<FILENAME>d207949dex99a1d.htm
<DESCRIPTION>EX-(A)(1)(D)
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Document 5 - file: d207949dex99a1d.htm

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<TYPE>EX-99.(A)(1)(E)
<SEQUENCE>6
<FILENAME>d207949dex99a1e.htm
<DESCRIPTION>EX-(A)(1)(E)
<TEXT>
Document 6 - file: d207949dex99a1e.htm

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<SEQUENCE>7
<FILENAME>d207949dex99a5e.htm
<DESCRIPTION>EX-(A)(5)(E)
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Document 7 - file: d207949dex99a5e.htm

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Document 8 - file: d207949dex99b1.htm

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<FILENAME>d207949dex99d2.htm
<DESCRIPTION>EX-(D)(2)
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Document 9 - file: d207949dex99d2.htm

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<FILENAME>g207949g02a89.jpg
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Document 10 - file: g207949g02a89.jpg

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Document 11 - file: g207949g02b89.jpg

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Document 12 - file: g207949g30a13.jpg

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<SEQUENCE>13
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Document 13 - file: g207949g30a14.jpg

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