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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 OR 15(d) of The

Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): April 29, 2021

CoreSite Realty Corporation

(Exact name of registrant as specified in its charter)

Maryland

001-34877

27-1925611

(State or other jurisdiction

(Commission

(IRS Employer

of incorporation)

File Number)

Identification No.)

1001 17th Street, Suite 500

Denver, CO

80202

(Address of principal executive offices)

(Zip Code)

Registrant's telephone number, including area code: (866) 777-2673

N/A

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

      Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

      Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

      Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

      Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of Each Class

Trading Symbol

Name of each exchange on which registered

Common Stock, $0.01 par value per share

COR

New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Securities Exchange Act of 1934.

Emerging growth company

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

Section 2 — Financial Information

Item 2.02 Results of Operations and Financial Condition.

On April 29, 2021, CoreSite Realty Corporation ("CoreSite") issued a press release reporting financial results and operating information for the quarter ended March 31, 2021. In addition, CoreSite made available on its website supplemental operating and financial data for the same period. The text of the press release and the supplemental information package are furnished herewith as Exhibits 99.1 and 99.2, respectively.

The information in this report, including Exhibits 99.1 and 99.2 attached hereto, shall not be deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that section, and shall not be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing.

Section 9 — Financial Statements and Exhibits

Item 9.01 Financial Statements and Exhibits.

(d) The following exhibits are furnished with this Current Report on Form 8-K.

Exhibit No.

    

Description

99.1

Press Release, dated April 29, 2021.

99.2

Quarter Ended March 31, 2021, Earnings Release and Supplemental Information, dated April 29, 2021.

101.INS

XBRL Instance – the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.

101.SCH

XBRL Taxonomy Extension Schema Document.

101.LAB

XBRL Taxonomy Extension Labels Linkbase Document.

101.PRE

XBRL Taxonomy Extension Presentation Linkbase Document.

104

Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101).

2

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

CORESITE REALTY CORPORATION

Date: April 29, 2021

By:

/s/ Jeffrey S. Finnin

Name: Jeffrey S. Finnin

Title:   Chief Financial Officer

By:

/s/ Mark R. Jones

Name: Mark R. Jones

Title:   Chief Accounting Officer

3

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