FORM 4 [X] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      
1. Name and Address of Reporting Person * Carlyle Group Management L.L.C. 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)
(Last)         (First)         (Middle)
C/O THE CARLYLE GROUP, 1001, PENNSYLVANIA AVE., N.W., SUITE 220 SOUTH
3. Date of Earliest Transaction (MM/DD/YYYY)
6/10/2021
(Street)
WASHINGTON, DC 20004-2505
(City)       (State)       (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)
 
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. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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  6/10/2021    M    1200000  A  (1) 1200000  I  See footnotes (2)(3)(4)
Common Stock  6/10/2021    S    1200000  D $135.20  0  I  See footnotes (2)(3)(4)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 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 of Derivative Security: 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) 6/10/2021    M        1200000    (1)  (1) Common Stock  1200000   (1) 4675218  I  See footnotes (2)(3)(4)

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.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Carlyle Group Management L.L.C.
C/O THE CARLYLE GROUP, 1001
PENNSYLVANIA AVE., N.W., SUITE 220 SOUTH
WASHINGTON, DC 20004-2505

X

Carlyle Group Inc.
C/O THE CARLYLE GROUP, 1001
PENNSYLVANIA AVE., N.W., SUITE 220 SOUTH
WASHINGTON, DC 20004-2505

X

Carlyle Holdings I GP Inc.
C/O THE CARLYLE GROUP, 1001
PENNSYLVANIA AVE., N.W., SUITE 220 SOUTH
WASHINGTON, DC 20004-2505

X

Carlyle Holdings I GP Sub L.L.C.
C/O THE CARLYLE GROUP, 1001
PENNSYLVANIA AVE., N.W., SUITE 220 SOUTH
WASHINGTON, DC 20004-2505

X

Carlyle Holdings I L.P.
C/O THE CARLYLE GROUP, 1001
PENNSYLVANIA AVE., N.W., SUITE 220 SOUTH
WASHINGTON, DC 20004-2505

X

CG Subsidiary Holdings L.L.C.
C/O THE CARLYLE GROUP, 1001
PENNSYLVANIA AVE., N.W., SUITE 220 SOUTH
WASHINGTON, DC 20004-2505

X

TC Group, LLC
C/O THE CARLYLE GROUP, 1001
PENNSYLVANIA AVE., N.W., SUITE 220 SOUTH
WASHINGTON, DC 20004-2505

X

TC Group Sub L.P.
C/O THE CARLYLE GROUP, 1001
PENNSYLVANIA AVE., N.W. SUITE 220 SOUTH
WASHINGTON, DC 20004-2505

X


Signatures
Carlyle Group Management L.L.C., By: /s/ Anne Frederick, Attorney-in-fact for Curtis L. Buser, Chief Financial Officer 6/14/2021
**Signature of Reporting Person Date
The Carlyle Group Inc., By: /s/ Anne Frederick, Attorney-in-fact for Curtis L. Buser, Chief Financial Officer 6/14/2021
**Signature of Reporting Person Date
Carlyle Holdings I GP Inc., By: /s/ Anne Frederick, Attorney-in-fact for Curtis L. Buser, Managing Director and Chief Financial Officer 6/14/2021
**Signature of Reporting Person Date
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, Managing Director and Chief Financial Officer 6/14/2021
**Signature of Reporting Person Date
Carlyle Holdings I L.P., By: /s/ Anne Frederick, Attorney-in-fact for Curtis L. Buser, Managing Director 6/14/2021
**Signature of Reporting Person Date
CG Subsidiary Holdings L.L.C., By: /s/ Anne Frederick, Attorney-in-fact for Curtis L. Buser, Managing Director 6/14/2021
**Signature of Reporting Person Date
TC Group, L.L.C., By: /s/ Anne Frederick, Attorney-in-fact for Curtis L. Buser, Managing Director 6/14/2021
**Signature of Reporting Person Date
TC Group Sub L.P., By: TC Group, L.L.C., its general partner, By: /s/ Anne Frederick, Attorney-in-fact for Curtis L. Buser, Managing Director 6/14/2021
**Signature of Reporting Person Date
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