Item 2.02 Results of Operations and Financial Condition.

On October 28, 2021, CoreSite Realty Corporation ("CoreSite") issued a press release reporting financial results and operating information for the quarter ended September 30, 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.

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 October 28, 2021.

99.2             Quarter Ended September 30, 2021, Earnings Release and Supplemental
               Information, dated October 28, 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).








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