SEC Form 4

FORM 4		UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* Carlyle Group Management L.L.C. (Last) (First) (Middle) C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE., N.W., SUITE 220 SOUTH (Street) WASHINGTON DC 20004-2505 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol CoreSite Realty Corp [ COR ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below)
	3. Date of Earliest Transaction (Month/Day/Year) 08/05/2020
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	08/05/2020		M		230,172	A	(1)	230,172	I	See footnotes(2)(3)(4)
Common Stock	08/05/2020		S		230,172	D	$128.55	0	I	See footnotes(2)(3)(4)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Operating Partnership Units	(1)	08/05/2020		M			230,172	(1)	(1)	Common Stock	230,172	(1)	5,875,218	I	See footnotes(2)(3)(4)

1. Name and Address of Reporting Person* Carlyle Group Management L.L.C. (Last) (First) (Middle) C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE., N.W., SUITE 220 SOUTH (Street) WASHINGTON DC 20004-2505 (City) (State) (Zip)

1. Name and Address of Reporting Person* Carlyle Group Inc. (Last) (First) (Middle) C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE., N.W., SUITE 220 SOUTH (Street) WASHINGTON DC 20004-2505 (City) (State) (Zip)

1. Name and Address of Reporting Person* Carlyle Holdings I GP Inc. (Last) (First) (Middle) C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE., N.W., SUITE 220 SOUTH (Street) WASHINGTON DC 20004-2505 (City) (State) (Zip)

1. Name and Address of Reporting Person* Carlyle Holdings I GP Sub L.L.C. (Last) (First) (Middle) C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE., N.W., SUITE 220 SOUTH (Street) WASHINGTON DC 20004-2505 (City) (State) (Zip)

1. Name and Address of Reporting Person* Carlyle Holdings I L.P. (Last) (First) (Middle) C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE., N.W., SUITE 220 SOUTH (Street) WASHINGTON DC 20004-2505 (City) (State) (Zip)

1. Name and Address of Reporting Person* CG Subsidiary Holdings L.L.C. (Last) (First) (Middle) C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE., N.W., SUITE 220 SOUTH (Street) WASHINGTON DC 20004-2505 (City) (State) (Zip)

1. Name and Address of Reporting Person* TC Group, LLC (Last) (First) (Middle) C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE., N.W., SUITE 220 SOUTH (Street) WASHINGTON DC 20004-2505 (City) (State) (Zip)

1. Name and Address of Reporting Person* TC Group Sub L.P. (Last) (First) (Middle) C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE., N.W. SUITE 220 SOUTH (Street) WASHINGTON DC 20004-2505 (City) (State) (Zip)

Explanation of Responses:

1. The operating partnership units are redeemable at any time for cash or, at the election of the Issuer, exchangeable for shares of common stock on a one-for-one basis, and have no expiration date.

2. Following the transaction reported herein, the common units are held by CoreSite CRP V Holdings, LLC.

3. Following an internal reorganization and by reason of the relationships described below, the reporting person may be deemed to share beneficial ownership of the securities reported herein. Each reporting person disclaims beneficial ownership of any such securities, except to the extent of its pecuniary interest therein.

4. Carlyle Group Management L.L.C. holds an irrevocable proxy to vote a majority of the shares of The Carlyle Group Inc., which is a publicly traded entity listed on NASDAQ. The Carlyle Group Inc. is the sole shareholder of Carlyle Holdings I GP Inc., which is the sole member of Carlyle Holdings I GP Sub L.L.C., which is the general partner of Carlyle Holdings I L.P., which, with respect to the securities reported herein, is the managing member of CG Subsidiary Holdings L.L.C., which is the managing member of TC Group, L.L.C., which is the general partner of TC Group Sub L.P., which is the sole member of Carlyle Realty V GP, L.L.C., which is the general partner of Carlyle Realty V, L.P., which is the manager of CoreSite CRP V Holdings, LLC

Remarks:

Due to the limitations of the electronic filing system Carlyle Realty V GP, L.L.C., Carlyle Realty V, L.P. and CoreSite CRP V Holdings, LLC are filing a separate Form 4.

	Carlyle Group Management L.L.C, By: /s/ Anne Frederick, Attorney-in-fact for Curtis L. Buser, Chief Financial Officer	08/07/2020
	The Carlyle Group Inc., By: /s/ Anne Frederick, Attorney-in-fact for Curtis L. Buser, Chief Financial Officer	08/07/2020
	Carlyle Holdings I GP Inc., By: /s/ Anne Frederick, Attorney-in-fact for Curtis L. Buser, Chief Financial Officer	08/07/2020
	Carlyle Holdings I GP Sub L.L.C., By: Carlyle Holdings I GP Inc., its sole member, By: /s/ Anne Frederick, Attorney-in-fact for Curtis L. Buser, Chief Financial Officer	08/07/2020
	Carlyle Holdings I L.P., By: /s/ Anne Frederick, Attorney-in-fact for Curtis L. Buser, Chief Financial Officer	08/07/2020
	CG Subsidiary Holdings L.L.C., By: Carlyle Holdings I L.P., its managing member, By: /s/ Anne Frederick, Attorney-in-fact for Curtis L. Buser, Chief Financial Officer	08/07/2020
	TC Group, L.L.C., By: CG Subsidiary Holdings L.L.C.., its managing member, By: Carlyle Holdings I L.P., its managing member, By: /s/ Anne Frederick, Attorney-in-fact for Curtis L. Buser, Chief Financial Officer	08/07/2020
	TC Group Sub L.P., By: TC Group, L.L.C., its general partner, By: CG Subsidiary Holdings L.L.C., its managing member, By: Carlyle Holdings I L.P., its managing member, By: /s/ Anne Frederick, Attorney-in-fact for Curtis L. Buser, Chief Financial Officer	08/07/2020
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.