COR / Cencora, Inc. - Pemfailan SEC, Laporan Tahunan, Penyata Proksi

Cencora, Inc.
US ˙ NYSE ˙ US03073E1055

Statistik Asas
LEI 549300H0YYORITFM2B74
CIK 1490892
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Cencora, Inc.
SEC Filings (Chronological Order)
Halaman ini menyediakan senarai kronologi lengkap bagi Pemfailan SEC, tidak termasuk pemfailan pemilikan yang kami sediakan di tempat lain.
February 11, 2022 SC 13G/A

COR / CoreSite Realty Corp / Carlyle Group Inc. - SC 13G/A Passive Investment

Securities and Exchange Commission Washington, D.C. 20549 Schedule 13G (Rule 13d-102) Information to be Included in Statements Filed Pursuant to ? 240.13d-1(b), (c) and (d) and Amendments Thereto Filed Pursuant to ? 240.13d-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 7)* CoreSite Realty Corporation (Name of Issuer) Common Stock (Title of Class of Securities) 21870Q105 (CUSIP Number)

February 2, 2022 SC 13G/A

COR / CoreSite Realty Corp / MASSACHUSETTS FINANCIAL SERVICES CO /MA/ - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1 )* CORESITE REALTY CORPORATION (Name of Issuer) Real Estate Investment Trust (Title of Class of Securities) 21870Q105 (CUSIP Number) December 31, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule p

January 7, 2022 15-12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13 AND 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934. Commission File Number: 001-34877 CoreSite Realty Corporation (Exact name of registrant as specifie

December 28, 2021 EX-99.(A)(5)(H)

Press Release issued by American Tower Corporation on December 28, 2021.

Exhibit (a)(5)(H) ATC Contact: Adam Smith Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER ANNOUNCES EXPIRATION OF TENDER OFFER PERIOD FOR OUTSTANDING SHARES OF CORESITE REALTY CORPORATION Boston, Massachusetts ? December 28, 2021 ? American Tower Corporation (NYSE: AMT) (?American Tower?) announced today the expiration of its previously announced tender offer for all outstanding shares of common stock of CoreSite Realty Corporation (NYSE: COR) (?CoreSite?).

December 28, 2021 SC 14D9/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 (Rule 14d-101) SOLICITATION/RECOMMENDATION STATEMENT UNDER SECTION 14(d)(4) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 5) CoreSite Realty Corporation (N

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 (Rule 14d-101) SOLICITATION/RECOMMENDATION STATEMENT UNDER SECTION 14(d)(4) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 5) CoreSite Realty Corporation (Name of Subject Company) CoreSite Realty Corporation (Name of Person Filing Statement) COMMON STOCK, PAR VALUE $0.01 PER SHARE (Title of Class of Secur

December 28, 2021 POS AM

As filed with the Securities and Exchange Commission on December 28, 2021

As filed with the Securities and Exchange Commission on December 28, 2021 Registration No.

December 28, 2021 S-8 POS

As filed with the Securities and Exchange Commission on December 28, 2021

As filed with the Securities and Exchange Commission on December 28, 2021 Registration No.

December 28, 2021 EX-99.25

EX-99.25

NOTIFICATION OF THE REMOVAL FROM LISTING AND REGISTRATION OF THE STATED SECURITIES The New York Stock Exchange hereby notifies the SEC of its intention to remove the entire class of the stated securities from listing and registration on the Exchange at the opening of business on January 10, 2022, pursuant to the provisions of Rule 12d2-2 (a).

December 28, 2021 POS AM

As filed with the Securities and Exchange Commission on December 28, 2021

As filed with the Securities and Exchange Commission on December 28, 2021 Registration No.

December 28, 2021 EX-3.1

Certificate of Formation of Appleseed Holdco LLC.

Exhibit 3.1 CERTIFICATE OF FORMATION OF APPLESEED HOLDCO LLC This Certificate of Formation of Appleseed Holdco LLC (the ?Company?), dated as of November 12, 2021, has been duly executed and is being filed by the undersigned, as an authorized person, to form a limited liability company under the Delaware Limited Liability Company Act (6 Del. C. ? 18-101, et. seq). FIRST. The name of the limited lia

December 28, 2021 POS AM

As filed with the Securities and Exchange Commission on December 28, 2021

As filed with the Securities and Exchange Commission on December 28, 2021 Registration No.

December 28, 2021 EX-3.2

Amended and Restated Limited Liability Company Operating Agreement of Appleseed Holdco LLC.

Exhibit 3.2 AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT OF APPLESEED HOLDCO LLC This Amended and Restated Limited Liability Company Agreement (the ?Agreement?) of Appleseed Holdco LLC, a Delaware limited liability company (the ?Company?), effective as of December 23, 2021, is adopted and entered into by American Tower Investments LLC, a California limited liability company, as the sol

December 28, 2021 SC TO-T/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO TENDER OFFER STATEMENT UNDER SECTION 14(D)(1) OR 13(E)(1) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 6) CoreSite Realty Corporation (Name of Subject Compan

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO TENDER OFFER STATEMENT UNDER SECTION 14(D)(1) OR 13(E)(1) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 6) CoreSite Realty Corporation (Name of Subject Company (Issuer)) Appleseed Merger Sub LLC (Offeror) American Tower Corporation American Tower Investments LLC Appleseed Holdco LLC (Parents of Offeror) (Na

December 28, 2021 S-8 POS

As filed with the Securities and Exchange Commission on December 28, 2021

As filed with the Securities and Exchange Commission on December 28, 2021 Registration No.

December 28, 2021 POSASR

As filed with the Securities and Exchange Commission on December 28, 2021

As filed with the Securities and Exchange Commission on December 28, 2021 Registration No.

December 28, 2021 8-K

Changes in Control of Registrant, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Material Modification to Rights of Security Holders, Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing, Financial Statements and Exhibits, Completion of Acquisition or Disposition of Assets

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): December 28, 2021 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction of incorporation) (Comm

December 20, 2021 SC 14D9/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 (Rule 14d-101) SOLICITATION/RECOMMENDATION STATEMENT UNDER SECTION 14(d)(4) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 4) CoreSite Realty Corporation (N

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 (Rule 14d-101) SOLICITATION/RECOMMENDATION STATEMENT UNDER SECTION 14(d)(4) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 4) CoreSite Realty Corporation (Name of Subject Company) CoreSite Realty Corporation (Name of Person Filing Statement) COMMON STOCK, PAR VALUE $0.01 PER SHARE (Title of Class of Secur

December 17, 2021 SC TO-T/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO TENDER OFFER STATEMENT UNDER SECTION 14(D)(1) OR 13(E)(1) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 5) CoreSite Realty Corporation (Name of Subject Compan

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO TENDER OFFER STATEMENT UNDER SECTION 14(D)(1) OR 13(E)(1) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 5) CoreSite Realty Corporation (Name of Subject Company (Issuer)) Appleseed Merger Sub LLC (Offeror) American Tower Corporation American Tower Investments LLC Appleseed Holdco LLC (Parents of Offeror) (Na

December 17, 2021 SC 14D9/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 (Rule 14d-101) SOLICITATION/RECOMMENDATION STATEMENT UNDER SECTION 14(d)(4) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 3) CoreSite Realty Corporation (N

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 (Rule 14d-101) SOLICITATION/RECOMMENDATION STATEMENT UNDER SECTION 14(d)(4) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 3) CoreSite Realty Corporation (Name of Subject Company) CoreSite Realty Corporation (Name of Person Filing Statement) COMMON STOCK, PAR VALUE $0.01 PER SHARE (Title of Class of Secur

December 10, 2021 EX-99.(B)(3)

Fourth Amended and Restated Revolving Credit Agreement, dated as of December 8, 2021, by and among ATC, as borrower, Toronto Dominion (Texas) LLC, as administrative agent, and the lenders party thereto.

Exhibit (b)(3) Execution Version FOURTH AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT AMONG AMERICAN TOWER CORPORATION, AS THE BORROWER; TORONTO DOMINION (TEXAS) LLC AS ADMINISTRATIVE AGENT FOR THE LENDERS; THE FINANCIAL INSTITUTIONS PARTIES HERETO; AND WITH TD SECURITIES (USA), LLC, MIZUHO BANK, LTD.

December 10, 2021 EX-99.(B)(4)

Second Amended and Restated Term Loan Agreement, dated as of December 8, 2021, by and among ATC, as borrower, Mizuho Bank, Ltd., as administrative agent, and the lenders party thereto.

Exhibit (b)(4) Execution Version SECOND AMENDED AND RESTATED TERM LOAN AGREEMENT AMONG AMERICAN TOWER CORPORATION, AS BORROWER; MIZUHO BANK, LTD.

December 10, 2021 SC 14D9/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 (Rule 14d-101) SOLICITATION/RECOMMENDATION STATEMENT UNDER SECTION 14(d)(4) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 2) CoreSite Realty Corporation (N

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 (Rule 14d-101) SOLICITATION/RECOMMENDATION STATEMENT UNDER SECTION 14(d)(4) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 2) CoreSite Realty Corporation (Name of Subject Company) CoreSite Realty Corporation (Name of Person Filing Statement) COMMON STOCK, PAR VALUE $0.01 PER SHARE (Title of Class of Secur

December 10, 2021 EX-99.(B)(5)

364-Day Term Loan Agreement, dated as December 8, 2021, by and among ATC, as borrower, JPMorgan Chase Bank, N.A., as administrative agent, and the lenders party thereto.

Exhibit (b)(5) Execution Version 364-DAY TERM LOAN AGREEMENT AMONG AMERICAN TOWER CORPORATION, AS BORROWER; JPMORGAN CHASE BANK, N.

December 10, 2021 EX-99.(B)(2)

Third Amended and Restated Multicurrency Revolving Credit Agreement, dated as of December 8, 2021, by and among ATC, as borrower, Toronto Dominion (Texas) LLC, as administrative agent, and the lenders party thereto.

Exhibit (b)(2) Execution Version THIRD AMENDED AND RESTATED MULTICURRENCY REVOLVING CREDIT AGREEMENT AMONG AMERICAN TOWER CORPORATION AND CERTAIN OF ITS SUBSIDIARIES, AS THE BORROWERS; TORONTO DOMINION (TEXAS) LLC AS ADMINISTRATIVE AGENT FOR THE LENDERS; THE FINANCIAL INSTITUTIONS PARTIES HERETO; AND WITH TD SECURITIES (USA), LLC, MIZUHO BANK, LTD.

December 10, 2021 EX-99.(B)(6)

2-Year Term Loan Agreement, dated as December 8, 2021, by and among ATC, as borrower, JPMorgan Chase Bank, N.A., as administrative agent, and the lenders party thereto.

Exhibit (b)(6) Execution Version 2-YEAR TERM LOAN AGREEMENT AMONG AMERICAN TOWER CORPORATION, AS BORROWER; JPMORGAN CHASE BANK, N.

December 10, 2021 SC TO-T/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO TENDER OFFER STATEMENT UNDER SECTION 14(D)(1) OR 13(E)(1) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 4) CoreSite Realty Corporation (Name of Subject Compan

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO TENDER OFFER STATEMENT UNDER SECTION 14(D)(1) OR 13(E)(1) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 4) CoreSite Realty Corporation (Name of Subject Company (Issuer)) Appleseed Merger Sub LLC (Offeror) American Tower Corporation American Tower Investments LLC Appleseed Holdco LLC (Parents of Offeror) (Na

December 7, 2021 SC 14D9/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 (Rule 14d-101) SOLICITATION/RECOMMENDATION STATEMENT UNDER SECTION 14(d)(4) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 1) CoreSite Realty Corporation (N

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 (Rule 14d-101) SOLICITATION/RECOMMENDATION STATEMENT UNDER SECTION 14(d)(4) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 1) CoreSite Realty Corporation (Name of Subject Company) CoreSite Realty Corporation (Name of Person Filing Statement) COMMON STOCK, PAR VALUE $0.01 PER SHARE (Title of Class of Secur

December 7, 2021 SC TO-T/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO TENDER OFFER STATEMENT UNDER SECTION 14(D)(1) OR 13(E)(1) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 3) CoreSite Realty Corporation (Name of Subject Compan

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO TENDER OFFER STATEMENT UNDER SECTION 14(D)(1) OR 13(E)(1) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 3) CoreSite Realty Corporation (Name of Subject Company (Issuer)) Appleseed Merger Sub LLC (Offeror) American Tower Corporation American Tower Investments LLC Appleseed Holdco LLC (Parents of Offeror) (Na

December 6, 2021 EX-99.(A)(5)(G)

AMERICAN TOWER CORPORATION COMPANY CONFERENCE PRESENTATION | DEC 06, 2021

Exhibit (a)(5)(G) AMERICAN TOWER CORPORATION COMPANY CONFERENCE PRESENTATION | DEC 06, 2021 Presentation Batya Levi UBS Investment Bank, Research Division Okay.

December 6, 2021 SC TO-T/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO TENDER OFFER STATEMENT UNDER SECTION 14(D)(1) OR 13(E)(1) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 2) CoreSite Realty Corporation (Name of Subject Compan

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO TENDER OFFER STATEMENT UNDER SECTION 14(D)(1) OR 13(E)(1) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 2) CoreSite Realty Corporation (Name of Subject Company (Issuer)) Appleseed Merger Sub LLC (Offeror) American Tower Corporation American Tower Investments LLC Appleseed Holdco LLC (Parents of Offeror) (Na

December 2, 2021 SC TO-T/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO TENDER OFFER STATEMENT UNDER SECTION 14(D)(1) OR 13(E)(1) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 1) CoreSite Realty Corporation (Name of Subject Compan

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO TENDER OFFER STATEMENT UNDER SECTION 14(D)(1) OR 13(E)(1) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 1) CoreSite Realty Corporation (Name of Subject Company (Issuer)) Appleseed Merger Sub LLC (Offeror) American Tower Corporation American Tower Investments LLC Appleseed Holdco LLC (Parents of Offeror) (Na

December 2, 2021 EX-99.(A)(5)(F)

AMERICAN TOWER CORPORATION COMPANY CONFERENCE PRESENTATION | DEC 01, 2021

Exhibit (a)(5)(F) AMERICAN TOWER CORPORATION COMPANY CONFERENCE PRESENTATION | DEC 01, 2021 Question and Answer Eric Thomas Luebchow Wells Fargo Securities, LLC, Research Division So Rod, I wanted to jump into something that?s obviously been really topical given the recent announcement, and that?s your acquisition ? announced acquisition of CoreSite.

November 29, 2021 EX-99.(A)(1)(D)

Form of Letter to Clients for Use by Brokers, Dealers, Commercial Banks, Trust Companies and Other Nominees.

Exhibit (a)(1)(D) Offer To Purchase For Cash All Outstanding Shares of Common Stock of CoreSite Realty Corporation a Maryland corporation at $170.

November 29, 2021 EX-99.(B)(1)

Commitment Letter, dated as of November 14, 2021, between ATC and JPMorgan Chase Bank, N.A.

Exhibit (b)(1) JPMORGAN CHASE BANK, N.A. 383 Madison Avenue New York, New York 10179 PERSONAL AND CONFIDENTIAL November 14, 2021 American Tower Corporation 116 Huntington Avenue, 11th Floor Boston, MA 02116 Attention: Rodney M. Smith, Executive Vice President, Chief Financial Officer and Treasurer Project Appleseed Commitment Letter Ladies and Gentlemen: American Tower Corporation, a Delaware corp

November 29, 2021 EX-99.(A)(1)(A)

Offer to Purchase, dated November 29, 2021.

Table of Contents Exhibit (a)(1)(A) Offer to Purchase All Outstanding Shares of Common Stock of CORESITE REALTY CORPORATION At $170.

November 29, 2021 SC TO-T

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO TENDER OFFER STATEMENT UNDER SECTION 14(D)(1) OR 13(E)(1) OF THE SECURITIES EXCHANGE ACT OF 1934 CoreSite Realty Corporation (Name of Subject Company (Issuer)) Apples

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO TENDER OFFER STATEMENT UNDER SECTION 14(D)(1) OR 13(E)(1) OF THE SECURITIES EXCHANGE ACT OF 1934 CoreSite Realty Corporation (Name of Subject Company (Issuer)) Appleseed Merger Sub LLC (Offeror) American Tower Corporation American Tower Investments LLC Appleseed Holdco LLC (Parents of Offeror) (Names of Filing Pers

November 29, 2021 EX-99.(A)(1)(C)

Form of Letter to Brokers, Dealers, Commercial Banks, Trust Companies and Other Nominees.

Exhibit (a)(1)(C) Offer To Purchase For Cash All Outstanding Shares of Common Stock of CoreSite Realty Corporation a Maryland corporation at $170.

November 29, 2021 SC 14D9

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 (Rule 14d-101) SOLICITATION/RECOMMENDATION STATEMENT UNDER SECTION 14(d)(4) OF THE SECURITIES EXCHANGE ACT OF 1934 CoreSite Realty Corporation (Name of Subject Com

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 (Rule 14d-101) SOLICITATION/RECOMMENDATION STATEMENT UNDER SECTION 14(d)(4) OF THE SECURITIES EXCHANGE ACT OF 1934 CoreSite Realty Corporation (Name of Subject Company) CoreSite Realty Corporation (Name of Person Filing Statement) COMMON STOCK, PAR VALUE $0.01 PER SHARE (Title of Class of Secur

November 29, 2021 EX-99.(D)(2)

Mutual Confidential Disclosure Agreement, dated as of September 4, 2021, between CoreSite and American Tower LLC.

Exhibit (d)(2) September 4, 2021 CONFIDENTIAL Richard Rossi Senior Vice President & General Counsel 116 Huntington Avenue Boston, MA 02116 Ladies and Gentlemen: In connection with the consideration by American Towers LLC, a Delaware limited liability company, on behalf of itself, its parent company, American Tower Corporation, its subsidiaries and affiliates (?Counterparty?) of a possible negotiated transaction (a ?Transaction?) with CoreSite Realty Corporation (the ?Company,? and collectively with Counterparty, the ?parties,? and each a ?party?), each of the parties has been or may be furnished with certain Confidential Information (as defined below) by or on behalf of the other party.

November 29, 2021 EX-99.(A)(1)(B)

Form of Letter of Transmittal.

Exhibit (a)(1)(B) LETTER OF TRANSMITTAL To tender shares of common stock of CoreSite Realty Corporation (?CoreSite?), $0.

November 29, 2021 EX-99.(A)(5)(E)

Press Release issued by American Tower Corporation on November 29, 2021.

Exhibit (a)(5)(E) ATC Contact: Adam Smith Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER COMMENCES CASH TENDER OFFER FOR ALL OUTSTANDING SHARES OF CORESITE Boston, Massachusetts? November 29, 2021 ? American Tower Corporation (NYSE: AMT) (?American Tower?) today announced the commencement of the tender offer by its wholly owned indirect subsidiary, Appleseed Merger Sub LLC, for all outstanding shares of the common stock of CoreSite Realty Corporation (NYSE: COR) (?CoreSite?) at a price of $170.

November 29, 2021 EX-99.(A)(1)(E)

Form of Summary Advertisement, published November 29, 2021 in The Wall Street Journal.

Exhibit (a)(1)(E) This announcement is neither an offer to purchase nor a solicitation of an offer to sell Shares (as defined below).

November 26, 2021 EX-99.1

Notice of Merger of Appleseed Merger Sub LLC with and into CoreSite Realty Corporation, issued on November 26, 2021

Exhibit 99.1 NOTICE OF MERGER OF APPLESEED MERGER SUB LLC WITH AND INTO CORESITE REALTY CORPORATION PURSUANT TO SECTION 3-106.1(e) OF THE MARYLAND GENERAL CORPORATION LAW November 26, 2021 Dear Stockholder of CoreSite Realty Corporation, As previously announced, Appleseed Merger Sub LLC, a Maryland limited liability company (?Merger Sub?) and a wholly owned subsidiary of Appleseed Holdco LLC, a De

November 26, 2021 SC TO-C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO (RULE 14d-100) Tender Offer Statement under Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 CoreSite Realty Corporation (Name of Subject Company)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO (RULE 14d-100) Tender Offer Statement under Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 CoreSite Realty Corporation (Name of Subject Company) Appleseed Merger Sub LLC (Offeror) American Tower Corporation Appleseed Holdco LLC American Tower Investments LLC (Parents of Offeror) (Names of Filin

November 16, 2021 EX-99.1

CoreSite Realty Corporation Letter to Customers, first used on November 15, 2021 (incorporated by reference to Exhibit 99.1 to the Schedule 14D-9C filed with the SEC by CoreSite Realty Corporation on November 16, 2021).

? Exhibit 99.1? Dear [CUSTOMER], CoreSite?s purpose is to provide you with trusted and connectivity-rich data communities to power your digital transformation and create a more collaborative world. Our success has been, and continues to be, dependent on your success as our valued customer. We appreciate our role as your business ally, entrusted with your critical infrastructure, so you are ready f

November 16, 2021 EX-99.2

CoreSite Realty Corporation Letter to Vendors, first used on November 15, 2021 (incorporated by reference to Exhibit 99.2 to the Schedule 14D-9C filed with the SEC by CoreSite Realty Corporation on November 16, 2021).

? Exhibit 99.2? Dear [VENDOR], As a valued partner and member of the strategic CoreSite digital ecosystem, I wanted to inform you of an important and exciting development. Today, CoreSite announced that we have entered into an agreement to be acquired by American Tower Corporation, a leading global provider of wireless communications infrastructure, including towers and next generation wireless te

November 16, 2021 SC14D9C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 (Rule 14d-101) SOLICITATION/RECOMMENDATION STATEMENT UNDER SECTION 14(d)(4) OF THE SECURITIES EXCHANGE ACT OF 1934 CORESITE REALTY CORPORATION (Name of Subject Com

? ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? SCHEDULE 14D-9 (Rule 14d-101) SOLICITATION/RECOMMENDATION STATEMENT UNDER SECTION 14(d)(4) OF THE SECURITIES EXCHANGE ACT OF 1934 ? CORESITE REALTY CORPORATION (Name of Subject Company)? ? CORESITE REALTY CORPORATION (Name of Person Filing Statement)? ? COMMON STOCK, PAR VALUE $0.01 PER SHARE (Title of Class of Securit

November 16, 2021 EX-99.1

Transcript of American Tower Corporation investor call on November 15, 2021

Exhibit 99.1 American Tower Corporation (REIT) NYSE:AMT M&A Call Monday, November 15, 2021 1:00 PM GMT COPYRIGHT ? 2021 S&P Global Market Intelligence, a division of S&P Global Inc. All rights reserved spglobal.com/marketintelligence 1 Contents Table of Contents Call Participants 3 Presentation 4 Question and Answer 8 COPYRIGHT ? 2021 S&P Global Market Intelligence, a division of S&P Global Inc. A

November 16, 2021 SC TO-C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO (RULE 14d-100) Tender Offer Statement under Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 CoreSite Realty Corporation (Name of Subject Company)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO (RULE 14d-100) Tender Offer Statement under Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 CoreSite Realty Corporation (Name of Subject Company) Appleseed Merger Sub LLC (Offeror) American Tower Corporation Appleseed Holdco LLC (Parents of Offeror) (Names of Filing Persons) COMMON STOCK, $0.01

November 15, 2021 SC TO-C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO (RULE 14d-100) Tender Offer Statement under Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 CoreSite Realty Corporation (Name of Subject Company)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO (RULE 14d-100) Tender Offer Statement under Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 CoreSite Realty Corporation (Name of Subject Company) Appleseed Merger Sub LLC (Offeror) American Tower Corporation Appleseed Holdco LLC (Parents of Offeror) (Names of Filing Persons) COMMON STOCK, $0.01

November 15, 2021 EX-99.1

AMERICAN TOWER TO ACQUIRE CORESITE

Exhibit 99.1 ATC Contact: Adam Smith Vice President, Investor Relations Telephone: (617) 375-7500 CoreSite Contact: Kate Ruppe Manager, Investor Relations Telephone: (303) 222-7369 AMERICAN TOWER TO ACQUIRE CORESITE Boston, Massachusetts and Denver, Colorado ? November 15, 2021 ? American Tower Corporation (NYSE: AMT) (?American Tower?) and CoreSite Realty Corporation (NYSE: COR) (?CoreSite?) toda

November 15, 2021 EX-99.1

CoreSite Realty Corporation Email to Employees, first used on November 15, 2021 (incorporated by reference to Exhibit 99.1 to the Schedule 14D-9C filed with the SEC by CoreSite Realty Corporation on November 15, 2021).

Exhibit 99.1 Dear CoreSite Colleagues, Today we announced that CoreSite has entered into an agreement to combine with American Tower Corporation, a leading global provider of wireless communications infrastructure, including towers and next generation wireless technologies, with a presence in 25 countries across six continents. We believe the transaction will create a differentiated, comprehensive

November 15, 2021 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Entry into a Material Definitive Agreement, Other Events, Financial Statements and Exhibits

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): November 14, 2021 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction of incorporation) (Comm

November 15, 2021 SC14D9C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 (Rule 14d-101) SOLICITATION/RECOMMENDATION STATEMENT UNDER SECTION 14(d)(4) OF THE SECURITIES EXCHANGE ACT OF 1934 CORESITE REALTY CORPORATION (Name of Subject Com

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 (Rule 14d-101) SOLICITATION/RECOMMENDATION STATEMENT UNDER SECTION 14(d)(4) OF THE SECURITIES EXCHANGE ACT OF 1934 CORESITE REALTY CORPORATION (Name of Subject Company) CORESITE REALTY CORPORATION (Name of Person Filing Statement) COMMON STOCK, PAR VALUE $0.01 PER SHARE (Title of Class of Securities) 21870Q105 (

November 15, 2021 EX-99.1

Joint Press Release issued by American Tower Corporation and CoreSite Realty Corporation on November 15, 2021

Exhibit 99.1 ATC Contact: Adam Smith Vice President, Investor Relations Telephone: (617) 375-7500 CoreSite Contact: Kate Ruppe Manager, Investor Relations Telephone: (303) 222-7369 AMERICAN TOWER TO ACQUIRE CORESITE Boston, Massachusetts and Denver, Colorado ? November 15, 2021 ? American Tower Corporation (NYSE: AMT) (?American Tower?) and CoreSite Realty Corporation (NYSE: COR) (?CoreSite?) toda

November 15, 2021 EX-2.1

Agreement and Plan of Merger, dated November 14, 2021, by and among CoreSite Realty Corporation, CoreSite, L.P., American Tower Investments LLC, Appleseed Holdco LLC, Appleseed Merger Sub LLC, Appleseed OP Merger Sub LLC and, solely for certain provisions specified therein, American Tower Corporation

Exhibit 2.1 EXECUTION VERSION AGREEMENT AND PLAN OF MERGER by and among AMERICAN TOWER INVESTMENTS LLC, APPLESEED HOLDCO LLC, APPLESEED MERGER SUB LLC, APPLESEED OP MERGER SUB LLC, CORESITE REALTY CORPORATION, CORESITE, L.P. and SOLELY FOR PURPOSES OF ?Section 2.4(c), ?Section 2.4(e), ?Section 4.1, ?Section 4.2, ? Section 4.4, ?Section 4.5(a)(ii), ?Section 4.5(c), ?Section 4.5(d), ?Section 4.5(e),

November 15, 2021 EX-3.1

Amendment to Amended and Restated Bylaws of CoreSite Realty Corporation

Exhibit 3.1 CORESITE REALTY CORPORATION FIRST AMENDMENT TO AMENDED AND RESTATED BYLAWS On November 14, 2021, the Board of Directors of CoreSite Realty Corporation, a Maryland corporation (the ?Corporation?), at a duly convened meeting of the Board of Directors at which all of the directors were present, by the unanimous vote of all of the directors of the Corporation and in accordance with the Mar

November 15, 2021 EX-99.2

Presentation made available by American Tower Corporation on its website to investors on November 15, 2021

American Tower Announces Acquisition of CoreSite November 15, 2021 Exhibit 99.2 Disclaimer Definitions are provided at the end of this presentation. "Safe Harbor" Statement under the Private Securities Litigation Reform Act of 1995: This presentation contains statements about future events and expectations, or ?forward-looking statements,? all of which are inherently uncertain. We have based these

October 29, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2021 ☐Transition Report Pursuant t

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.

October 28, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

? ? 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): October 28, 2021 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) ? Maryland 001-34877 27-1925611 (State or other jurisdiction (Commission (IRS

October 28, 2021 EX-99.2

Financial Statements

Table of Contents ? ? ? Table of Contents Table of Contents ? ? Overview ? Earnings Release 3 Company Profile 7 Summary of Financial Data 8 Financial Statements ? Consolidated Balance Sheets 9 Consolidated Statements of Operations 10 Reconciliations of Net Income to FFO, AFFO, EBITDAre and Adjusted EBITDA 11 Operating Portfolio ? Operating Portfolio & 10 Largest Customers 12 Leasing Statistics 13

October 28, 2021 EX-99.1

CoreSite Reports Third Quarter 2021 Financial Results – Delivered Strong Q3 Financial Results, Including 6.4% Revenue Growth Year Over Year –

? ? ? CoreSite Reports Third Quarter 2021 Financial Results ? Delivered Strong Q3 Financial Results, Including 6.

July 30, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2021 ☐Transition Report Pursuant to Sec

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.

July 29, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

? ? 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): July 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 Em

July 29, 2021 EX-99.2

Financial Statements

Table of Contents ? ? ? Table of Contents Table of Contents ? ? Overview ? Earnings Release 3 Company Profile 7 Summary of Financial Data 8 Financial Statements ? Consolidated Balance Sheets 9 Consolidated Statements of Operations 10 Reconciliations of Net Income to FFO, AFFO, EBITDAre and Adjusted EBITDA 11 Operating Portfolio ? Operating Portfolio & 10 Largest Customers 12 Leasing Statistics 13

July 29, 2021 EX-99.1

CoreSite Reports Second Quarter 2021 Financial Results – Delivered Strong Q2 Financial Results, Including 7.7% Revenue Growth Year Over Year – – Executed $7.8 Million of New and Expansion Sales, Driven by Retail Colocation and Small Scale – – Increas

? ? ? CoreSite Reports Second Quarter 2021 Financial Results ? Delivered Strong Q2 Financial Results, Including 7.

May 25, 2021 8-K

Submission of Matters to a Vote of Security Holders

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): May 19, 2021 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction of incorporation) (Commissio

April 30, 2021 EX-10.1

2021 Executive Short-Term Incentive Plan.*

Exhibit 10.1 CORESITE REALTY CORPORATION 2021 EXECUTIVE SHORT-TERM INCENTIVE PLAN ? The 2021 Executive Short-Term Incentive Plan (the ?Plan?) is a cash bonus plan in which executives of CoreSite Realty Corporation (the ?Company?) or any affiliate are eligible to participate. The Plan provides incentive cash bonuses based on the achievement of goals relating to the financial performance of the Comp

April 30, 2021 10-Q

Quarterly Report - 10-Q

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.

April 29, 2021 EX-99.1

Financial Statements

EX-99.1 2 cor-20210429xex99d1.htm EX-99.1 Table of Contents Table of Contents Table of Contents Overview Earnings Release 3 Company Profile 7 Summary of Financial Data 8 Financial Statements Consolidated Balance Sheets 9 Consolidated Statements of Operations 10 Reconciliations of Net Income to FFO, AFFO, EBITDAre and Adjusted EBITDA 11 Operating Portfolio Operating Portfolio & 10 Largest Customers

April 29, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

? ? 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 E

April 29, 2021 EX-99.2

CoreSite Reports First Quarter 2021 Financial Results - Delivered Strong Q1 Financial Results, Including 7.0% Revenue Growth Year Over Year - - Executed $7.0 Million of New and Expansions Sales, Driven by Retail Colocation and Small Scale -

? ? ? CoreSite Reports First Quarter 2021 Financial Results - Delivered Strong Q1 Financial Results, Including 7.

March 26, 2021 DEF 14A

Form DEF 14A filed March 26, 2021

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.???????? ??) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? ? Confidential, for Use of the Commission Only (as permitte

March 26, 2021 DEFA14A

Form DEFA 14A filed March 26, 2021

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defin

February 12, 2021 SC 13G/A

Securities and Exchange Commission Washington, D.C. 20549 Schedule 13G (Rule 13d-102) Information to be Included in Statements Filed Pursuant to § 240.13d-1(b), (c) and (d) and Amendments Thereto Filed Pursuant to § 240.13d-2 UNDER THE SECURITIES EXC

Securities and Exchange Commission Washington, D.C. 20549 Schedule 13G (Rule 13d-102) Information to be Included in Statements Filed Pursuant to ? 240.13d-1(b), (c) and (d) and Amendments Thereto Filed Pursuant to ? 240.13d-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 6)* CoreSite Realty Corporation (Name of Issuer) Common Stock (Title of Class of Securities) 21870Q105 (CUSIP Number)

February 11, 2021 SC 13G

SCHEDULE 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* CORESITE REALTY CORPORATION (Name of Issuer) Real Estate Investment Trust (Title of Class of Securities) 21870Q105 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pur

February 10, 2021 SC 13G/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 11)*

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 11)* Name of issuer: CoreSite Realty Corp. Title of Class of Securities: REIT CUSIP Number: 21870Q105 Date of Event Which Requires Filing of this Statement: December 31, 2020 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ☒ Rule

February 5, 2021 10-K

Annual Report - 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For The Fiscal Year Ended December 31, 2020 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For The Transition Period From To Commission file number 001-348

February 5, 2021 EX-21.1

Subsidiaries of CoreSite Realty Corporation.

Exhibit 21.1 Subsidiaries of CoreSite Realty Corporation Name Jurisdiction CoreSite, L.P. DE CoreSite, L.L.C. DE CoreSite Data Center Services, Inc. DE CoreSite Development Services, Inc. DE CoreSite 1099 14th Street NW, L.L.C. DE CoreSite 1275 K Street, L.L.C. DE CoreSite 32 Avenue of the Americas, L.L.C. DE CoreSite Denver, L.L.C. CO CoreSite One Wilshire, L.L.C. DE CoreSite Real Estate 12100 Su

February 4, 2021 EX-99.2

Financial Statements

Table of Contents Table of Contents Table of Contents Overview Earnings Release 3 Company Profile 8 Summary of Financial Data 9 Financial Statements Consolidated Balance Sheets 10 Consolidated Statements of Operations 11 Reconciliations of Net Income to FFO, AFFO, EBITDAre and Adjusted EBITDA 12 Operating Portfolio Operating Portfolio & 10 Largest Customers 13 Leasing Statistics 14 Geographic and

February 4, 2021 EX-99.1

CoreSite Reports Fourth Quarter 2020 Financial Results - Signed $37.6 Million of New and Expansion Sales for the Full Year 2020, Including $9.7 Million in Q4 - - Delivered New Data Center Capacity of 192,000 NRSF During 2020, Including 50,000 NRSF in

EX-99.1 2 cor-20210204xex99d1.htm EX-99.1 CoreSite Reports Fourth Quarter 2020 Financial Results - Signed $37.6 Million of New and Expansion Sales for the Full Year 2020, Including $9.7 Million in Q4 - - Delivered New Data Center Capacity of 192,000 NRSF During 2020, Including 50,000 NRSF in Q4 - - Ended 2020 with 40 Megawatts of Leasable Capacity - DENVER, CO – February 4, 2021 – CoreSite Realty

February 4, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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): February 4, 2021 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction (Commission (IRS Employe

February 1, 2021 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits - FORM 8-K

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): February 1, 2021 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction of incorporation) (Commi

February 1, 2021 EX-99.1

Michael Millegan Joins CoreSite Realty Corporation’s Board of Directors

Exhibit 99.1 Michael Millegan Joins CoreSite Realty Corporation’s Board of Directors Denver, CO – February 1, 2021 – CoreSite Realty Corporation (NYSE:COR) (the “Company” or “CoreSite”), a premier provider of secure, reliable, high-performance data center, cloud and interconnection solutions in major U.S. metropolitan areas, today announced Michael Millegan, founder and current Chief Executive Off

October 30, 2020 10-Q

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2020 ☐Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to . Commission file number: 001-34877 C

October 29, 2020 EX-99.2

Financial Statements

Table of Contents Table of Contents Table of Contents Overview Earnings Release 3 Company Profile 8 Summary of Financial Data 9 Financial Statements Consolidated Balance Sheets 10 Consolidated Statements of Operations 11 Reconciliations of Net Income to FFO, AFFO, EBITDAre and Adjusted EBITDA 12 Operating Portfolio Operating Properties 13 Leasing Statistics 14 Geographic and Vertical Diversificati

October 29, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition - 8-K

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): October 29, 2020 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction (Commission (IRS Employe

October 29, 2020 EX-99.1

CoreSite Reports Third Quarter 2020 Financial Results -- Signed $12.5 Million of New and Expansion Sales for the Quarter, Our Highest in 4 Quarters -- -- On-Time Completion of the LA3 Phase 1 Development in Mid-October --

CoreSite Reports Third Quarter 2020 Financial Results - Signed $12.5 Million of New and Expansion Sales for the Quarter, Our Highest in 4 Quarters - - On-Time Completion of the LA3 Phase 1 Development in Mid-October - DENVER, CO – October 29, 2020 – CoreSite Realty Corporation (NYSE:COR) (“the Company”), a premier provider of secure, reliable, high-performance data center, cloud and interconnectio

October 1, 2020 S-3ASR

- S-3ASR

TABLE OF CONTENTS As filed with the Securities and Exchange Commission on October 1, 2020 Registration No.

October 1, 2020 EX-4.4

Form of Indenture

Exhibit 4.4 CORESITE REALTY CORPORATION INDENTURE Dated as of , 20 Trustee TABLE OF CONTENTS PAGE ARTICLE I DEFINITIONS AND INCORPORATION BY REFERENCE 1 Section 1.1 Definitions 1 Section 1.2 Other Definitions 3 Section 1.3 Incorporation by Reference of Trust Indenture Act 4 Section 1.4 Rules of Construction 4 ARTICLE II THE SECURITIES 4 Section 2.1 Issuable in Series 4 Section 2.2 Establishment of

August 26, 2020 EX-99.1

Patricia Higgins Joins CoreSite Realty Corporation’s Board of Directors

Exhibit 99.1 Patricia Higgins Joins CoreSite Realty Corporation’s Board of Directors Denver, CO – August 26, 2020 – CoreSite Realty Corporation (NYSE:COR) (the “Company” or “CoreSite”), a premier provider of secure, reliable, high-performance data center, cloud and interconnection solutions in major U.S. metropolitan areas, today announced Patricia Higgins, retired President and Chief Executive Of

August 26, 2020 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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): August 26, 2020 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction of incorporation) (Commis

August 5, 2020 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 5, 2020 (August 3, 2020) CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction of incorpora

August 5, 2020 EX-1.1

Underwriting Agreement, dated August 3, 2020, among the Company, CoreSite, L.P., the Selling Stockholders and Morgan Stanley & Co. LLC, as Underwriter

Exhibit 1.1 Execution Version CoreSite Realty Corporation 230,172 Shares Common Stock ($0.01 par value) Underwriting Agreement New York, New York August 3, 2020 Morgan Stanley & Co. LLC 1585 Broadway New York, New York 10036 As Representative of the several Underwriters Ladies and Gentlemen: The persons named in Schedule I hereto (the “Selling Stockholders”) propose to sell to the several underwri

August 4, 2020 424B7

230,172 Shares CoreSite Realty Corporation Common Stock

Use these links to rapidly review the document TABLE OF CONTENTS TABLE OF CONTENTS Table of Contents Filed Pursuant to Rule 424(b)(7) Registration No.

August 3, 2020 FWP

CoreSite Realty Corporation Announces Sale of Common Stock by The Carlyle Group

Filed Pursuant to Rule 433 of the Securities Act of 1933, as amended Registration Statement No.

July 31, 2020 10-Q

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2020 ☐Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to . Commission file number: 001-34877 CoreSi

July 30, 2020 EX-99.2

CoreSite Reports Second Quarter 2020 Financial Results -- Completed Construction of CH2 Phase 1, Comprised of 55,000 NRSF -- -- Completed the 52,000 NRSF Expansion at SV8 Phase 3 -- -- Increased Liquidity with $150 Million of Senior Notes –

Table of Contents Table of Contents Table of Contents Overview Earnings Release 3 Company Profile 8 Summary of Financial Data 9 Financial Statements Consolidated Balance Sheets 10 Consolidated Statements of Operations 11 Reconciliations of Net Income to FFO, AFFO, EBITDAre and Adjusted EBITDA 12 Operating Portfolio Operating Properties 13 Leasing Statistics 14 Geographic and Vertical Diversificati

July 30, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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): July 30, 2020 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction (Commission (IRS Employer o

July 30, 2020 EX-99.1

CoreSite Reports Second Quarter 2020 Financial Results -- Completed Construction of CH2 Phase 1, Comprised of 55,000 NRSF -- -- Completed the 52,000 NRSF Expansion at SV8 Phase 3 -- -- Increased Liquidity with $150 Million of Senior Notes --

CoreSite Reports Second Quarter 2020 Financial Results - Completed Construction of CH2 Phase 1, Comprised of 55,000 NRSF - - Completed the 52,000 NRSF Expansion at SV8 Phase 3 - - Increased Liquidity with $150 Million of Senior Notes - DENVER, CO – July 30, 2020 – CoreSite Realty Corporation (NYSE:COR) (“the Company”), a premier provider of secure, reliable, high-performance data center, cloud and interconnection solutions across the U.

July 14, 2020 8-K

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 14, 2020 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction of incorporation) (Commission

May 27, 2020 8-K

Submission of Matters to a Vote of Security Holders

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): May 20, 2020 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction of incorporation) (Commissio

May 7, 2020 EX-1.1

Underwriting Agreement, dated May 4, 2020, among the Company, CoreSite, L.P., the Selling Stockholders and Morgan Stanley & Co. LLC, as Underwriter

Exhibit 1.1 Execution Version CoreSite Realty Corporation 2,620,000 Shares Common Stock ($0.01 par value) Underwriting Agreement New York, New York May 4, 2020 Morgan Stanley & Co. LLC 1585 Broadway New York, New York 10036 As Representatives of the several Underwriters Ladies and Gentlemen: The persons named in Schedule I hereto (the “Selling Stockholders”) propose to sell to the several underwri

May 7, 2020 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 7, 2020 (May 6, 2020) CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction of incorporation)

May 7, 2020 EX-99.1

CoreSite Realty Corporation Announces Closing of $150 million of 3.75% Senior Notes Offering

Exhibit 99.1 CoreSite Realty Corporation Announces Closing of $150 million of 3.75% Senior Notes Offering Denver, CO – May 6, 2020 – CoreSite Realty Corporation (NYSE:COR) (“CoreSite”), a premier provider of secure, reliable, high-performance data center, cloud access and interconnection solutions across the U.S., today announced that its operating partnership, CoreSite, L.P. (the “Operating Partn

May 7, 2020 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 7, 2020 (May 4, 2020) CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction of incorporation)

May 7, 2020 EX-10.1

Note Purchase Agreement, dated as of May 6, 2020, by and among CoreSite Realty Corporation, CoreSite, L.P. and the purchasers listed on the Purchaser Schedule thereto.

Exhibit 10.1 EXECUTION VERSION CoreSite, L.P. $150,000,000 3.75% Series C Senior Notes due May 6, 2027 Note Purchase Agreement Dated May 6, 2020 TABLE OF CONTENTS Page Section 1. Authorization of Notes 1 Section 2. Sale and Purchase of Notes 1 Section 2.1. Notes 1 Section 2.2. Parent Guaranty 1 Section 2.3. Subsidiary Guaranties 2 Section 3. Closing 2 Section 3.1. First Closing 2 Section 3.2. Seco

May 6, 2020 424B7

2,620,000 Shares CoreSite Realty Corporation Common Stock

Use these links to rapidly review the document TABLE OF CONTENTS TABLE OF CONTENTS Table of Contents Filed Pursuant to Rule 424(b)(7) Registration No.

May 5, 2020 FWP

CoreSite Realty Corporation Announces Pricing of Sale of Common Stock by The Carlyle Group

Filed Pursuant to Rule 433 of the Securities Act of 1933, as amended Registration Statement No.

May 4, 2020 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 4, 2020 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction of incorporation) (Commission Fi

May 4, 2020 FWP

CoreSite Realty Corporation Announces Sale of Common Stock by The Carlyle Group

Filed Pursuant to Rule 433 of the Securities Act of 1933, as amended Registration Statement No.

May 1, 2020 EX-10.2

2020 Executive Short-Term Incentive Plan.*

Exhibit 10.2 CORESITE REALTY CORPORATION 2020 EXECUTIVE SHORT-TERM INCENTIVE PLAN The 2020 Executive Short-Term Incentive Plan (the “Plan”) is a cash bonus plan in which executives of CoreSite Realty Corporation (the “Company”) or any affiliate are eligible to participate. The Plan provides incentive cash bonuses based on the achievement of goals relating to the financial performance of the Compan

May 1, 2020 10-Q

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2020 ☐Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to . Commission file number: 001-34877 CoreS

May 1, 2020 EX-10.1

Amended and Restated Non-Employee Director Compensation Policy.*

Exhibit 10.1 Amended and Restated Non-Employee Director Compensation Policy 1.General. The Non-Employee Director Compensation Policy (the "Policy"), as set forth herein, was initially adopted by the Board of Directors (the "Board") of CoreSite Realty Corporation (the "Company") to become effective as of the completion of the Company's initial public offering of its common stock, was amended effect

May 1, 2020 EX-10.3

Ninth Amendment to the Lease, dated March 18, 2020, between GI TC One Wilshire, LLC and CoreSite One Wilshire, L.L.C. (formerly known as CRG West One Wilshire, L.L.C.) #

Exhibit 10.3 CERTAIN INFORMATION MARKED BY [***] HAS BEEN EXCLUDED FROM THIS EXHIBIT BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) WOULD LIKELY CAUSE COMPETITIVE HARM TO THE REGISTRANT IF PUBLICLY DISCLOSED. NINTH AMENDMENT TO LEASE THIS NINTH AMENDMENT TO LEASE (this “Amendment”) is dated for reference purposes only as of , 2020 (the “Ninth Amendment Date”), by and between GI TC ONE WILSHIRE, LLC,

April 30, 2020 EX-99.2

Low-latency, secure and reliable access to Amazon, Microsoft, Google, Alibaba Cloud, Oracle and IBM from all eight key North American Markets.

Table of Contents Table of Contents Overview Company Profile 3 Summary of Financial Data 4 Earnings Release 5 Financial Statements Consolidated Balance Sheets 10 Consolidated Statements of Operations 11 Reconciliations of Net Income to FFO, AFFO, EBITDAre and Adjusted EBITDA 12 Operating Portfolio Operating Properties 13 Leasing Statistics 14 Geographic and Vertical Diversification 16 10 Largest C

April 30, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 30, 2020 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction (Commission (IRS Employer

April 30, 2020 EX-99.1

CoreSite Reports First Quarter 2020 Financial Results -- Delivered $12.0 Million of New and Expansion Sales for Quarter -- -- Achieved Highest Core Retail Colocation Sales in Three and a Half Years -- -- Continued Progress on Capacity Development Pip

CoreSite Reports First Quarter 2020 Financial Results - Delivered $12.0 Million of New and Expansion Sales for Quarter - - Achieved Highest Core Retail Colocation Sales in Three and a Half Years - - Continued Progress on Capacity Development Pipeline - DENVER, CO – April 30, 2020 – CoreSite Realty Corporation (NYSE:COR) (“the Company”), a premier provider of secure, reliable, high-performance data

April 13, 2020 DEFA14A

April 13, 2020

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant þ Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨ Defin

March 26, 2020 DEF 14A

March 26, 2020

Use these links to rapidly review the document TABLE OF CONTENTS Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

March 26, 2020 DEFA14A

March 26, 2020

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) o Defin

March 20, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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): March 20, 2020 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction of incorporation) (Commiss

March 20, 2020 EX-99.1

Forward Looking Statements

Exhibit 99.1 Forward Looking Statements The following Investor FAQs may contain forward-looking statements within the meaning of the federal securities laws. Forward-looking statements relate to expectations, beliefs, projections, future plans and strategies, anticipated events or trends and similar expressions concerning matters that are not historical facts. In some cases, you can identify forwa

February 13, 2020 EX-99

JOINT FILING AGREEMENT

EX-99 Exhibit 99 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree that they are jointly filing this statement on Schedule 13G.

February 13, 2020 EX-24

POWER OF ATTORNEY

EX-24 Exhibit 24 POWER OF ATTORNEY The undersigned understands that, from time to time, the Carlyle Companies (defined below) are required to prepare, execute and file certain federal and state securities laws filings.

February 13, 2020 SC 13G/A

COR / Coresite Realty Corp / Carlyle Group L.P. - SC 13G/A Passive Investment

SC 13G/A Securities and Exchange Commission Washington, D.C. 20549 Schedule 13G (Rule 13d-102) Information to be Included in Statements Filed Pursuant to § 240.13d-1(b), (c) and (d) and Amendments Thereto Filed Pursuant to § 240.13d-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 5)* CoreSite Realty Corporation (Name of Issuer) Common Stock (Title of Class of Securities) 21870Q105 (CUSI

February 11, 2020 SC 13G/A

COR / Coresite Realty Corp / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 10)* Name of issuer: CoreSite Realty Corp Title of Class of Securities: REIT CUSIP Number: 21870Q105 Date of Event Which Requires Filing of this Statement: December 31, 2019 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ☒ Rule

February 7, 2020 EX-4.3

Description of Securities

Exhibit 4.3 DESCRIPTION OF CAPITAL STOCK The following is a summary description of the capital stock of CoreSite Realty Corporation. This description of the terms of our capital stock does not purport to be complete and is subject to and qualified in its entirety by reference to the applicable provisions of Maryland General Corporation Law, or the MGCL, and our charter and bylaws. For purposes of

February 7, 2020 10-K

Annual Report - 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For The Fiscal Year Ended December 31, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For The Transition Period From To Commission file number 001-348

February 7, 2020 EX-21.1

Subsidiaries of CoreSite Realty Corporation.

Exhibit 21.1 Subsidiaries of CoreSite Realty Corporation Name Jurisdiction CoreSite, L.P. DE CoreSite, L.L.C. DE CoreSite Data Center Services, Inc. DE CoreSite Development Services, Inc. DE CoreSite 1099 14th Street NW, L.L.C. DE CoreSite 1275 K Street, L.L.C. DE CoreSite 32 Avenue of the Americas, L.L.C. DE CoreSite Denver, L.L.C. CO CoreSite One Wilshire, L.L.C. DE CoreSite Real Estate 12100 Su

February 6, 2020 EX-99.2

Low-latency, secure and reliable on-premises access to Amazon, Microsoft, Google, Alibaba Cloud, Oracle and IBM from all eight key North American Markets.

Table of Contents Table of Contents Overview Company Profile 3 Summary of Financial Data 4 Earnings Release 5 Financial Statements Consolidated Balance Sheets 10 Consolidated Statements of Operations 11 Reconciliations of Net Income to FFO, AFFO, EBITDAre and Adjusted EBITDA 12 Operating Portfolio Operating Properties 13 Leasing Statistics 14 Geographic and Vertical Diversification 16 10 Largest C

February 6, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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): February 6, 2020 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction (Commission (IRS Employe

February 6, 2020 EX-99.1

CoreSite Reports Fourth Quarter 2019 Financial Results -- Achieved Company Record for New and Expansion Sales in 2019 -- -- Delivered New Data Center Capacity of 224,000 Square Feet for Year, including 74,000 in Q4 -- -- Additional Capacity Currently

CoreSite Reports Fourth Quarter 2019 Financial Results - Achieved Company Record for New and Expansion Sales in 2019 - - Delivered New Data Center Capacity of 224,000 Square Feet for Year, including 74,000 in Q4 - - Additional Capacity Currently Under Development of 196,000 Square Feet - DENVER, CO – February 6, 2020 – CoreSite Realty Corporation (NYSE:COR) (“the Company”), a premier provider of secure, reliable, high-performance data center and interconnection solutions across the U.

November 8, 2019 EX-99.1

CoreSite Announces Amended and Expanded Credit Facility - Increasing Liquidity to Fund Organic Growth and Address Near-Term Debt Maturities - - Increasing Total Borrowing Capacity Under the Credit Facility to $1.15 Billion -

Exhibit 99.1 CoreSite Announces Amended and Expanded Credit Facility - Increasing Liquidity to Fund Organic Growth and Address Near-Term Debt Maturities - - Increasing Total Borrowing Capacity Under the Credit Facility to $1.15 Billion - Denver, CO – November 8, 2019 – CoreSite Realty Corporation (NYSE:COR), a premier provider of secure, reliable, high-performance data center and interconnection s

November 8, 2019 EX-10.1

Fifth Amended and Restated Credit Agreement, among CoreSite, L.P., the subsidiary borrowers party thereto, KeyBank National Association, as administrative agent and a lender, the other lenders party thereto, KeyBanc Capital Markets, RBC Capital Markets, Regions Capital Markets, TD Securities (USA) LLC and Wells Fargo Securities, as revolving credit and term loan III joint lead arrangers and revolving credit and term loan III co-syndication agents, KeyBanc Capital Markets, RBC Capital Markets, SunTrust Robinson Humphrey, Inc., TD Securities (USA) LLC and Wells Fargo Securities, as term loan IV joint lead arrangers and term loan IV co-syndication agents, dated as of November 8, 2019. (23)

Exhibit 10.1 FIFTH AMENDED AND RESTATED CREDIT AGREEMENT DATED AS OF NOVEMBER 8, 2019 by and among CORESITE, L.P., AS PARENT BORROWER, CORESITE REAL ESTATE 70 INNERBELT, L.L.C., CORESITE REAL ESTATE 900 N. ALAMEDA, L.P., CORESITE REAL ESTATE 2901 CORONADO, L.P., CORESITE REAL ESTATE 1656 MCCARTHY, L.P., CORESITE REAL ESTATE 427 S. LASALLE, L.L.C., CORESITE REAL ESTATE 2972 STENDER, L.P., CORESITE

November 8, 2019 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 8, 2019 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction of incorporation) (Commissi

November 8, 2019 EX-10.2

Second Amendment to Amended and Restated Term Loan Agreement, among CoreSite, L.P., as borrower, Royal Bank of Canada, as administrative agent, on behalf of itself and certain other lenders, the other lenders party thereto and the guarantors party thereto, dated as of November 9, 2019. (23)

Exhibit 10.2 SECOND AMENDMENT TO AMENDED AND RESTATED TERM LOAN AGREEMENT AND OTHER LOAN DOCUMENTS This Second Amendment to Amended and Restated Term Loan Agreement and other Loan Documents (this “Second Amendment”) is made as of this 8th day of November, 2019, among CORESITE, L.P., a Delaware limited partnership (“Borrower”), ROYAL BANK OF CANADA, as Administrative Agent (the “Agent”) for the cer

November 1, 2019 10-Q

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2019 ☐Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to . Commission file number: 001-34877 C

November 1, 2019 EX-10.1

Eighth Amendment to Lease, date July 10, 2019, between GI TC One Wilshire, LLC and CoreSite One Wilshire L.L.C (formerly known as CRG West One Wilshire, L.L.C.) (24)

EXHIBIT 10.1 CERTAIN IDENTIFIED INFORMATION HAS BEEN EXCLUDED FROM THIS EXHIBIT BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) WOULD LIKELY CAUSE COMPETITIVE HARM TO THE REGISTRANT IF PUBLICLY DISCLOSED EIGHTH AMENDMENT TO LEASE THIS EIGHTH AMENDMENT TO LEASE (this “Amendment”) is dated for reference purposes only as of , 2019 (the “Eighth Amendment Date”), by and between GI TC ONE WILSHIRE, LLC, a

October 31, 2019 EX-99.1

CoreSite Reports Third Quarter 2019 Financial Results -- Delivered $14.4 Million of New and Expansion Sales for the Quarter -- -- Placed in Service 54,000 square feet for Quarter, and 151,000 Year To Date -- -- Pre-leased 74% of Phase 1 Development a

CoreSite Reports Third Quarter 2019 Financial Results - Delivered $14.4 Million of New and Expansion Sales for the Quarter - - Placed in Service 54,000 square feet for Quarter, and 151,000 Year To Date - - Pre-leased 74% of Phase 1 Development at LA3 - DENVER, CO – October 31, 2019 – CoreSite Realty Corporation (NYSE:COR) (“the Company”), a premier provider of secure, reliable, high-performance da

October 31, 2019 EX-99.2

Low-latency, secure and reliable on-premises access to Amazon, Microsoft, Google, Alibaba Cloud, Oracle and IBM from all eight key North American Markets via inter-site connectivity and a robust set of network service providers.

ONE DATA CENTER PROVIDER. EVERYTHING YOU NEED. ©2019 CoreSite Realty Corporation, All Rights Reserved Table of Contents Table of Contents Overview Company Profile 3 Summary of Financial Data 4 Earnings Release 5 Financial Statements Consolidated Balance Sheets 10 Consolidated Statements of Operations 11 Reconciliations of Net Income to FFO, AFFO, EBITDAre and Adjusted EBITDA 12 Operating Portfolio

October 31, 2019 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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): October 31, 2019 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction (Commission (IRS Employe

July 26, 2019 10-Q

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2019 ☐Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to . Commission file number: 001-34877 CoreSi

July 24, 2019 EX-99.2

Low-latency, secure and reliable on-premises access to Amazon, Microsoft, Google, Alibaba Cloud, Oracle and IBM from all eight key North American Markets via inter-site connectivity and a robust set of network service providers.

ONE DATA CENTER PROVIDER. EVERYTHING YOU NEED. ©2019 CoreSite Realty Corporation, All Rights Reserved Table of Contents Table of Contents Overview Company Profile 3 Summary of Financial Data 4 Earnings Release 5 Financial Statements Consolidated Balance Sheets 10 Consolidated Statements of Operations 11 Reconciliations of Net Income to FFO, AFFO, EBITDAre and Adjusted EBITDA 12 Operating Portfolio

July 24, 2019 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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): July 24, 2019 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction (Commission (IRS Employer o

July 24, 2019 EX-99.1

CoreSite Reports Second Quarter 2019 Financial Results -- Delivered a Record $27.3 Million of New and Expansion Sales for the Quarter -- -- Completed Expansions at LA1, LA2, and VA3 Phase 1B and Began Construction at LA3 -- -- Placed Nearly 100,000 S

CoreSite Reports Second Quarter 2019 Financial Results - Delivered a Record $27.3 Million of New and Expansion Sales for the Quarter - - Completed Expansions at LA1, LA2, and VA3 Phase 1B and Began Construction at LA3 - - Placed Nearly 100,000 Square Feet into Service - - Arranged $400 Million Financing - DENVER, CO – July 24, 2019 – CoreSite Realty Corporation (NYSE:COR) (“the Company”), a premie

July 17, 2019 8-K

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 17, 2019 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 i

May 22, 2019 8-K

Submission of Matters to a Vote of Security Holders

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): May 16, 2019 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001‑34877 27‑1925611 (State or other jurisdiction of incorporation) (Commissio

April 26, 2019 10-Q

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2019 ☐Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to . Commission file number: 001-34877 CoreS

April 26, 2019 EX-10.1

Amended and Restated Non-Employee Director Compensation Policy.*

Exhibit 10.1 Amended and Restated Non-Employee Director Compensation Policy 1. General. The Non-Employee Director Compensation Policy (the "Policy"), as set forth herein, was initially adopted by the Board of Directors (the "Board") of CoreSite Realty Corporation (the "Company") to become effective as of the completion of the Company’s initial public offering of its common stock, was amended effec

April 26, 2019 EX-10.2

2019 Executive Short-Term Incentive Plan.*

Exhibit 10.2 CORESITE REALTY CORPORATION 2019 EXECUTIVE SHORT-TERM INCENTIVE PLAN The 2019 Executive Short-Term Incentive Plan (the “Plan”) is a cash bonus plan in which executives of CoreSite Realty Corporation (the “Company”) or any affiliate are eligible to participate. The Plan provides incentive cash bonuses based on the achievement of goals relating to the financial performance of the Compan

April 24, 2019 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 24, 2019 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction (Commission (IRS Employer

April 24, 2019 EX-99.1

CoreSite Reports First Quarter 2019 Financial Results -- Delivered Improved Q1 Sales and Pre-leased Two Phases of SV8 in April -- -- Achieved Substantial Progress on Development Pipeline, including Closing Purchase of SV9 -- -- Executed Financing tha

CoreSite Reports First Quarter 2019 Financial Results - Delivered Improved Q1 Sales and Pre-leased Two Phases of SV8 in April - - Achieved Substantial Progress on Development Pipeline, including Closing Purchase of SV9 - - Executed Financing that funds Property Development and extends Debt Maturities – DENVER, CO – April 24, 2019 – CoreSite Realty Corporation (NYSE:COR) (“the Company”), a premier provider of secure, reliable, high-performance data center and interconnection solutions across the U.

April 24, 2019 EX-99.2

Low-latency, secure and reliable on-premises access to Amazon, Microsoft, Google, Alibaba Cloud, Oracle and IBM from all eight key North American Markets via inter-site connectivity and a robust set of network service providers.

ONE DATA CENTER PROVIDER. EVERYTHING YOU NEED. ©2019 CoreSite Realty Corporation, All Rights Reserved Table of Contents Table of Contents Overview Company Profile 3 Summary of Financial Data 4 Earnings Release 5 Financial Statements Consolidated Balance Sheets 10 Consolidated Statements of Operations 11 Reconciliations of Net Income to FFO, AFFO, EBITDAre and Adjusted EBITDA 12 Operating Portfolio

April 17, 2019 EX-99.1

CoreSite Realty Corporation Announces Closing of Senior Notes Offering

Exhibit 99.1 CoreSite Realty Corporation Announces Closing of Senior Notes Offering Denver, CO — April 17, 2019 — CoreSite Realty Corporation (NYSE:COR) (“CoreSite”), a premier provider of secure, reliable, high-performance data center and interconnection solutions across the U.S., today announced that its operating partnership, CoreSite, L.P. (the “Operating Partnership”), agreed to issue and sel

April 17, 2019 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 17, 2019 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction of incorporation) (Commission

April 17, 2019 EX-10.1

Note Purchase Agreement, dated as of April 17, 2019, by and among CoreSite Realty Corporation, CoreSite, L.P. and the purchasers listed on the Purchaser Schedule thereto. (25)

Exhibit 10.1 Execution Version CORESITE, L.P. $200,000,000 4.11% Series A Senior Notes due April 17, 2026 $200,000,000 4.31% Series B Senior Notes due April 17, 2029 NOTE PURCHASE AGREEMENT Dated April 17, 2019 TABLE OF CONTENTS Page SECTION 1. AUTHORIZATION OF NOTES 1 SECTION 2. SALE AND PURCHASE OF NOTES 1 Section 2.1. Notes 1 Section 2.2. Parent Guaranty 1 Section 2.3. Subsidiary Guaranties 2 S

March 29, 2019 DEFA14A

COR / Coresite Realty Corp DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) o Defin

March 29, 2019 DEF 14A

COR / Coresite Realty Corp DEF 14A

Use these links to rapidly review the document TABLE OF CONTENTS Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

February 13, 2019 EX-24

POWER OF ATTORNEY

EX-24 Exhibit 24 POWER OF ATTORNEY The undersigned understands that, from time to time, the Carlyle Companies (defined below) are required to prepare, execute and file certain federal and state securities laws filings.

February 13, 2019 SC 13G/A

COR / Coresite Realty Corp / Carlyle Group L.P. - SCHEDULE 13G/A (AMENDMENT NO. 4) Passive Investment

Schedule 13G/A (Amendment No. 4) Securities and Exchange Commission Washington, D.C. 20549 Schedule 13G (Rule 13d-102) Information to be Included in Statements Filed Pursuant to § 240.13d-1(b), (c) and (d) and Amendments Thereto Filed Pursuant to § 240.13d-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 4)* CoreSite Realty Corporation (Name of Issuer) Common Stock (Title of Class of Sec

February 11, 2019 SC 13G/A

COR / Coresite Realty Corp / VANGUARD GROUP INC Passive Investment

coresiterealtycorp.htm - Generated by SEC Publisher for SEC Filing SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 9 )* Name of issuer: CoreSite Realty Corp Title of Class of Securities: REIT CUSIP Number: 21870Q105 Date of Event Which Requires Filing of this Statement: December 31, 2018 Check the appropriate box to d

February 8, 2019 EX-10.37

2018 Executive Short‑Term Incentive Plan.*

Exhibit 10.37 CORESITE REALTY CORPORATION 2018 EXECUTIVE SHORT-TERM INCENTIVE PLAN The 2018 Executive Short-Term Incentive Plan (the “Plan”) is a cash bonus plan in which executives of CoreSite Realty Corporation (the “Company”) or any affiliate are eligible to participate. The Plan provides incentive cash bonuses based on the achievement of goals relating to the financial performance of the Compa

February 8, 2019 EX-21.1

Subsidiaries of CoreSite Realty Corporation.

Exhibit 21.1 Subsidiaries of CoreSite Realty Corporation Name Jurisdiction CoreSite, L.P. DE CoreSite, L.L.C. DE CoreSite Data Center Services, Inc. DE CoreSite Development Services, Inc. DE CoreSite 1099 14th Street NW, L.L.C. DE CoreSite 1275 K Street, L.L.C. DE CoreSite 32 Avenue of the Americas, L.L.C. DE CoreSite Denver, L.L.C. CO CoreSite One Wilshire, L.L.C. DE CoreSite Real Estate 12100 Su

February 8, 2019 EX-10.7

Form of Indemnification Agreement for directors and officers of CoreSite Realty Corporation. (26)*

Exhibit 10.7 [AMENDED AND RESTATED] INDEMNIFICATION AGREEMENT This [AMENDED AND RESTATED] Indemnification Agreement (“Agreement”) is made as of , 2018, by and between CoreSite Realty Corporation, a Maryland corporation (the “Company”), and (“Indemnitee”). RECITALS: WHEREAS, directors, officers, and other persons in service to corporations or business enterprises are being increasingly subjected to

February 8, 2019 10-K

COR / Coresite Realty Corp 10-K (Annual Report)

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For The Fiscal Year Ended December 31, 2018 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For The Transition Period From To Commission file number 001-348

February 6, 2019 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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): February 6, 2019 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction (Commission (IRS Employe

February 6, 2019 EX-99.2

Low-latency, secure and reliable on-premises access to Amazon, Microsoft, Google, Alibaba Cloud, Oracle and IBM from all eight key North American Markets via inter-site connectivity and a robust set of network service providers.

ONE DATA CENTER PROVIDER. EVERYTHING YOU NEED. ©2019 CoreSite Realty Corporation, All Rights Reserved Table of Contents Table of Contents Overview Company Profile 3 Summary of Financial Data 4 Earnings Release 5 Financial Statements Consolidated Balance Sheets 10 Consolidated Statements of Operations 11 Reconciliations of Net Income to FFO, AFFO, EBITDAre and Adjusted EBITDA 12 Operating Portfolio

February 6, 2019 EX-99.1

CoreSite Reports Fourth Quarter 2018 Financial Results -- Revenue Growth of 13% for the Year --

CoreSite Reports Fourth Quarter 2018 Financial Results - Revenue Growth of 13% for the Year - DENVER, CO – February 6, 2019 – CoreSite Realty Corporation (NYSE:COR) (“the Company”), a premier provider of secure, reliable, high-performance data center and interconnection solutions across the U.

January 31, 2019 SC 13G/A

COR / Coresite Realty Corp / VANGUARD SPECIALIZED FUNDS Passive Investment

SC 13G/A 1 coresiterealtycorp.htm SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.:8 )* Name of issuer: CoreSite Realty Corp Title of Class of Securities: REIT CUSIP Number: 21870Q105 Date of Event Which Requires Filing of this Statement: December 31, 2018 Check the appropriate box to designate the rule pursuant to whic

October 26, 2018 10-Q

COR / Coresite Realty Corp 10-Q (Quarterly Report)

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2018 ☐Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to . Commission file number: 001-34877 C

October 26, 2018 EX-10.1

Second Amendment to Sublease between GI TC One Wilshire Services, LLC and CoreSite One Wilshire, L.L.C. (formerly known as CRG West One Wilshire, L.L.C.), dated as of July 30, 2018.(22)

Exhibit 10.1 SECOND AMENDMENT TO SUBLEASE THIS SECOND AMENDMENT TO SUBLEASE (this “Amendment”) is dated as of July 30, 2018, by and between GI TC ONE WILSHIRE SERVICES, LLC, a Delaware limited liability company (“Landlord”), and CORESITE ONE WILSHIRE, L.L.C., a Delaware limited liability company (formerly known as CRG West One Wilshire, L.L.C.) (“Tenant”). R E C I T A L S: A. Landlord and Tenant a

October 25, 2018 EX-99.2

CoreSite Reports Third-Quarter 2018 Financial Results Reflecting Revenue Growth of 13.1% Year over Year

SECURE, RELIABLE, HIGH-PERFORMANCE DATA CENTER SOLUTIONS ®2018 CoreSite Realty Corporation, All Rights Reserved Table of Contents Table of Contents Overview Earnings Release 3 Company Profile 8 Summary of Financial Data 9 Financial Statements Consolidated Balance Sheets 10 Consolidated Statements of Operations 11 Reconciliations of Net Income to FFO, AFFO, EBITDAre and Adjusted EBITDA 12 Operating

October 25, 2018 EX-99.1

CoreSite Reports Third-Quarter 2018 Financial Results Reflecting Revenue Growth of 13.1% Year over Year

CoreSite Reports Third-Quarter 2018 Financial Results Reflecting Revenue Growth of 13.

October 25, 2018 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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): October 25, 2018 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction (Commission (IRS Employe

August 2, 2018 EX-1.1

Underwriting Agreement, dated July 30, 2018, among the Company, CoreSite, L.P., the Selling Stockholders and Citigroup Global Markets Inc. and Credit Suisse Securities (USA) LLC, as Underwriters

Exhibit 1.1 EXECUTION COPY CoreSite Realty Corporation 2,250,000 Shares Common Stock ($0.01 par value) Underwriting Agreement New York, New York July 30, 2018 Citigroup Global Markets Inc. 388 Greenwich Street New York, New York 10013 Credit Suisse Securities (USA) LLC Eleven Madison Avenue New York, New York 10010-3629 As Representatives of the several Underwriters Ladies and Gentlemen: The perso

August 2, 2018 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 2, 2018 (July 30, 2018) CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction of incorporat

August 1, 2018 424B7

Prospectus Supplement (To Prospectus dated October 11, 2011) Filed Pursuant to Rule 424(b)(7) Registration No. 333-177052

Use these links to rapidly review the document TABLE OF CONTENTS TABLE OF CONTENTS Table of Contents Prospectus Supplement (To Prospectus dated October 11, 2011) Filed Pursuant to Rule 424(b)(7) Registration No.

July 30, 2018 FWP

CoreSite Realty Corporation Announces Sale of Common Stock by The Carlyle Group

Filed Pursuant to Rule 433 of the Securities Act of 1933, as amended Registration Statement No.

July 30, 2018 8-K

Financial Statements and Exhibits, Other Events

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): July 30, 2018 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction of incorporation) (Commissi

July 30, 2018 EX-99.1

FEDERAL INCOME TAX CONSIDERATIONS

Exhibit 99.1 FEDERAL INCOME TAX CONSIDERATIONS The following is a general summary of certain material U.S. federal income tax considerations regarding our qualification and taxation as a real estate investment trust, or REIT, and the acquisition, ownership or disposition of our common stock. Supplemental U.S. federal income tax considerations relevant to the ownership of the securities offered by

July 27, 2018 10-Q

COR / Coresite Realty Corp 10-Q (Quarterly Report)

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2018 ☐Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to . Commission file number: 001-34877 CoreSi

July 26, 2018 EX-99.1

CoreSite Reports Second-Quarter 2018 Financial Results Reflecting Revenue Growth of 15.7% Year over Year

CoreSite Reports Second-Quarter 2018 Financial Results Reflecting Revenue Growth of 15.

July 26, 2018 EX-99.2

CoreSite Reports Second-Quarter 2018 Financial Results Reflecting Revenue Growth of 15.7% Year over Year

SECURE, RELIABLE, HIGH-PERFORMANCE DATA CENTER SOLUTIONS ®2018 CoreSite Realty Corporation, All Rights Reserved Table of Contents Table of Contents Overview Earnings Release 3 Company Profile 8 Summary of Financial Data 9 Financial Statements Consolidated Balance Sheets 10 Consolidated Statements of Operations 11 Reconciliations of Net Income to FFO, AFFO, EBITDAre and Adjusted EBITDA 12 Operating

July 26, 2018 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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): July 26, 2018 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction (Commission (IRS Employer o

July 2, 2018 EX-10.1

Seventh Amendment to Lease, dated as of June 30, 2018, between GI TC One Wilshire, LLC and CoreSite One Wilshire, LLC (formerly known as CRG West One Wilshire, L.L.C.).(21)

Exhibit 10.1 SEVENTH AMENDMENT TO LEASE THIS SEVENTH AMENDMENT TO LEASE (this “Amendment”) is dated for reference purposes only as of June 30, 2018 (the “Seventh Amendment Date”), by and between GI TC ONE WILSHIRE, LLC, a Delaware limited liability company (“Landlord”), and CORESITE ONE WILSHIRE, L.L.C., a Delaware limited liability company (formerly known as CRG West One Wilshire, L.L.C.) (“Tenan

July 2, 2018 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

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): July 2, 2018 (June 30, 2018) CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction of incorpora

June 13, 2018 EX-10.2

First Amendment to Note Purchase Agreement dated April 20, 2017 among CoreSite, L.P., CoreSite Realty Corporation and the noteholders party thereto, dated as of June 12, 2018.(13)

Exhibit 10.2 EXECUTION COPY CORESITE, L.P. FIRST AMENDMENT Dated June 12, 2018 to NOTE PURCHASE AGREEMENT Dated April 20, 2017 Re: $175,000,000 3.91% Senior Notes due April 20, 2024 FIRST AMENDMENT TO NOTE PURCHASE AGREEMENT THIS FIRST AMENDMENT, dated June 12, 2018 (this “First Amendment”), to the Note Purchase Agreement (as defined below) is among CoreSite, L.P., a Delaware limited partnership (

June 13, 2018 EX-10.1

First Amendment to Note Purchase Agreement dated June 15, 2016 among CoreSite, L.P., CoreSite Realty Corporation and the noteholders party thereto, dated as of June 12, 2018.(13)

Exhibit 10.1 EXECUTION COPY CORESITE, L.P. FIRST AMENDMENT Dated June 12, 2018 to NOTE PURCHASE AGREEMENT Dated June 15, 2016 Re: $150,000,000 4.19% Senior Notes due June 15, 2023 FIRST AMENDMENT TO NOTE PURCHASE AGREEMENT THIS FIRST AMENDMENT, dated June 12, 2018 (this “First Amendment”), to the Note Purchase Agreement (as defined below) is among CoreSite, L.P., a Delaware limited partnership (th

June 13, 2018 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 13, 2018 (June 12, 2018) CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction of incorporati

May 25, 2018 8-K

Submission of Matters to a Vote of Security Holders

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): May 23, 2018 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction of incorporation) (Commissio

April 27, 2018 10-Q

COR / Coresite Realty Corp 10-Q (Quarterly Report)

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2018 ☐Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to . Commission file number: 001-34877 CoreS

April 26, 2018 EX-99.1

CoreSite Reports First-Quarter 2018 Financial Results Reflecting Revenue Growth of 12.8% Year over Year

Exhibit 99.1 CoreSite Reports First-Quarter 2018 Financial Results Reflecting Revenue Growth of 12.8% Year over Year DENVER, CO – April 26, 2018 – CoreSite Realty Corporation (NYSE:COR), a premier provider of secure, reliable, high-performance data center and interconnection solutions across the U.S., today announced financial results for the first quarter ended March 31, 2018. Quarterly and Subse

April 26, 2018 EX-99.2

CoreSite Reports First-Quarter 2018 Financial Results Reflecting Revenue Growth of 12.8% Year over Year

SECURE, RELIABLE, HIGH-PERFORMANCE DATA CENTER SOLUTIONS ®2018 CoreSite Realty Corporation, All Rights Reserved Table of Contents Table of Contents Overview Earnings Release 3 Company Profile 8 Summary of Financial Data 9 Financial Statements Consolidated Balance Sheets 10 Consolidated Statements of Operations 11 Reconciliations of Net Income to FFO, AFFO, EBITDAre and Adjusted EBITDA 12 Operating

April 26, 2018 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 26, 2018 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction (Commission (IRS Employer

April 20, 2018 EX-10.2

First Amendment to Amended and Restated Term Loan Agreements among CoreSite, L.P., as borrower, Royal Bank of Canada, as administrative agent, on behalf of itself and certain other lenders, the other lenders party thereto and the guarantors party thereto, dated as of April 19, 2018.(6)

Exhibit 10.2 EXECUTION VERSION FIRST AMENDMENT TO AMENDED AND RESTATED TERM LOAN AGREEMENT AND OTHER LOAN DOCUMENTS This First Amendment to Amended and Restated Term Loan Agreement and other Loan Documents (this “Amendment”) is made as of this 19th day of April, 2018, among CORESITE, L.P., a Delaware limited partnership (“Borrower”), ROYAL BANK OF CANADA, as Administrative Agent (the “Agent”) for

April 20, 2018 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 20, 2018 (April 19, 2018) CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction of incorpora

April 20, 2018 EX-10.1

Fourth Amended and Restated Credit Agreement, among CoreSite, L.P., the subsidiary borrowers party thereto, KeyBank National Association, as administrative agent and a lender, the other lenders party thereto, Regions Bank, TD Securities (USA) LLC and Wells Fargo Securities, as co-documentation agents, RBC Capital Markets LLC, as syndication agent, and KeyBanc Capital Markets, Regions Capital Markets, RBC Capital Markets LLC, TD Securities (USA) LLC and Wells Fargo Securities, as joint lead arrangers and joint book managers, dated as of April 19, 2018.

Exhibit 10.1 FOURTH AMENDED AND RESTATED CREDIT AGREEMENT DATED AS OF APRIL 19, 2018 by and among CORESITE, L.P., AS PARENT BORROWER, CORESITE REAL ESTATE 70 INNERBELT, L.L.C., CORESITE REAL ESTATE 900 N. ALAMEDA, L.P., CORESITE REAL ESTATE 2901 CORONADO, L.P., CORESITE REAL ESTATE 1656 MCCARTHY, L.P., CORESITE REAL ESTATE 427 S. LASALLE, L.L.C., CORESITE REAL ESTATE 2972 STENDER, L.P., CORESITE R

April 20, 2018 EX-99.1

CoreSite Announces Amended and Expanded Credit Facility Increasing Total Borrowing Capacity to $1.05 Billion Increases available liquidity to fund ongoing organic growth and development pipeline

Exhibit 99.1 CoreSite Announces Amended and Expanded Credit Facility Increasing Total Borrowing Capacity to $1.05 Billion Increases available liquidity to fund ongoing organic growth and development pipeline Denver, CO — April 20, 2018 — CoreSite Realty Corporation (NYSE:COR), a premier provider of secure, reliable, high-performance data center and interconnection solutions across the U.S., today

April 10, 2018 SC 13G/A

COR / Coresite Realty Corp / WELLS FARGO & COMPANY/MN Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1) CORESITE RLTY CORP (Name of Issuer) COM (Title of Class of Securities) 21870Q105 (CUSIP Number) March 31, 2018 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is filed

March 30, 2018 DEFA14A

COR / Coresite Realty Corp DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) o Defin

March 30, 2018 DEF 14A

COR / Coresite Realty Corp DEF 14A

Use these links to rapidly review the document TABLE OF CONTENTS Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

March 13, 2018 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

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): March 8, 2018 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction of incorporation) (Commissi

February 9, 2018 EX-21.1

Subsidiaries of CoreSite Realty Corporation.

Exhibit 21.1 Subsidiaries of CoreSite Realty Corporation Name Jurisdiction CoreSite, L.P. DE CoreSite, L.L.C. DE CoreSite Data Center Services, Inc. DE CoreSite Development Services, Inc. DE CoreSite 1099 14th Street NW, L.L.C. DE CoreSite 1275 K Street, L.L.C. DE CoreSite 32 Avenue of the Americas, L.L.C. DE CoreSite Denver, L.L.C. CO CoreSite One Wilshire, L.L.C. DE CoreSite Real Estate 12100 Su

February 9, 2018 10-K

COR / Coresite Realty Corp 10-K (Annual Report)

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For The Fiscal Year Ended December 31, 2017 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For The Transition Period From To Commission file number 001-348

February 9, 2018 SC 13G/A

COR / Coresite Realty Corp / VANGUARD GROUP INC Passive Investment

coresiterealtycorp.htm - Generated by SEC Publisher for SEC Filing SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 8 )* Name of issuer: CoreSite Realty Corp Title of Class of Securities: REIT CUSIP Number: 21870Q105 Date of Event Which Requires Filing of this Statement: December 31, 2017 Check the appropriate box to d

February 9, 2018 EX-12.2

Computation of Ratio of Earnings to Combined Fixed Charges and Preferred Stock Dividends.

Exhibit 12.2 Computation of Ratio of Earnings to Combined Fixed Charges and Preferred Stock Dividends (in thousands) Year Ended December 31, 2017 2016 2015 2014 2013 Earnings: Net income $ 100,491 $ 81,921 $ 56,859 $ 40,052 $ 31,612 Add: Fixed charges 32,315 21,484 15,184 14,639 12,016 Add: Amortization of capitalized interest 2,306 1,936 1,545 1,128 679 Less: Capitalized interest (3,282) (4,121)

February 9, 2018 EX-12.1

Computation of Ratio of Earnings to Fixed Charges.

Exhibit 12.1 Computation of Ratio of Earnings to Fixed Charges (in thousands) Year Ended December 31, 2017 2016 2015 2014 2013 Earnings: Net income $ 100,491 $ 81,921 $ 56,859 $ 40,052 $ 31,612 Add: Fixed charges 32,315 21,484 15,184 14,639 12,016 Add: Amortization of capitalized interest 2,306 1,936 1,545 1,128 679 Less: Capitalized interest (3,282) (4,121) (3,698) (4,633) (4,362) Total earnings

February 8, 2018 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

corCurrentFolio8K 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): February 8, 2018 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction (Commi

February 8, 2018 EX-99.2

CoreSite Reports Fourth-Quarter 2017 Financial Results Reflecting Revenue Growth of 14% Year over Year

corEX99-2 SECURE, RELIABLE, HIGH-PERFORMANCE DATA CENTER SOLUTIONS ?2018 CoreSite Realty Corporation, All Rights Reserved Table of Contents Table of Contents Overview Earnings Release 3 Company Profile 8 Summary of Financial Data 9 Financial Statements Consolidated Balance Sheets 10 Consolidated Statements of Operations 11 Reconciliations of Net Income to FFO, AFFO, EBITDA and Adjusted EBITDA 12 O

February 8, 2018 EX-99.1

CoreSite Reports Fourth-Quarter 2017 Financial Results Reflecting Revenue Growth of 14.0% Year over Year

corEx991 Exhibit 99.1 CoreSite Reports Fourth-Quarter 2017 Financial Results Reflecting Revenue Growth of 14.0% Year over Year DENVER, CO ? February 8, 2018 ? CoreSite Realty Corporation (NYSE:COR), a premier provider of secure, reliable, high-performance data center and interconnection solutions across the U.S., today announced financial results for the fourth quarter ended December 31, 2017. Qua

February 2, 2018 SC 13G/A

COR / Coresite Realty Corp / VANGUARD SPECIALIZED FUNDS Passive Investment

coresiterealtycorp.htm - Generated by SEC Publisher for SEC Filing SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.:7 )* Name of issuer: CoreSite Realty Corp Title of Class of Securities: REIT CUSIP Number: 21870Q105 Date of Event Which Requires Filing of this Statement: December 31, 2017 Check the appropriate box to de

January 30, 2018 SC 13G

COR / Coresite Realty Corp / WELLS FARGO & COMPANY/MN Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. ) CORESITE RLTY CORP (Name of Issuer) COM (Title of Class of Securities) 21870Q105 (CUSIP Number) December 31, 2017 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is fil

December 12, 2017 EX-99.25

EX-99.25

NOTIFICATION OF THE REMOVAL FROM LISTING AND REGISTRATION OF THE STATED SECURITIES The New York Stock Exchange hereby notifies the SEC of its intention to remove the entire class of the stated securities from listing and registration on the Exchange at the opening of business on December 26, 2017, pursuant to the provisions of Rule 12d2-2 (a).

October 27, 2017 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2017 ☐Transition Report Pursuant t

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2017 ☐Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to . Commission file number: 001-34877 C

October 26, 2017 EX-99.1

CoreSite Reports Third-Quarter 2017 Financial Results Reflecting Revenue Growth of 22% Year over Year

corEx991 Exhibit 99.1 CoreSite Reports Third-Quarter 2017 Financial Results Reflecting Revenue Growth of 22% Year over Year DENVER, CO ? October 26, 2017 ? CoreSite Realty Corporation (NYSE:COR), a premier provider of secure, reliable, high-performance data center and interconnection solutions across the U.S., today announced financial results for the third quarter ended September 30, 2017. Quarte

October 26, 2017 EX-99.2

CoreSite Reports Third-Quarter 2017 Financial Results Reflecting Revenue Growth of 22% Year over Year

corEX99-2 Earnings Release and Supplemental Information SECURE, RELIABLE, HIGH-PERFORMANCE DATA CENTER SOLUTIONS ?2017 CoreSite Realty Corporation, All Rights Reserved Table of Contents Table of Contents Overview Earnings Release 3 Company Profile 8 Summary of Financial Data 9 Financial Statements Consolidated Balance Sheets 10 Consolidated Statements of Operations 11 Reconciliations of Net Income

October 26, 2017 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

corCurrentFolio8K 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): October 26, 2017 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction (Commi

October 19, 2017 EX-12.1

Computation of Ratio of Earnings to Fixed Charges

Exhibit 12.1 CoreSite Realty Corporation Computation of Ratio of Earnings to Fixed Charges (unaudited) (in thousands except ratios) Six Months Ended June 30, Year Ended December 31, 2017 2016 2015 2014 2013 2012 Earnings: Net income $ 49,195 $ 81,921 $ 56,859 $ 40,052 $ 31,612 $ 10,716 Add: Fixed charges 14,941 21,484 15,184 14,639 12,016 10,792 Add: Amortization of capitalized interest 1,106 1,93

October 19, 2017 EX-4.4

Form of Indenture

Exhibit 4.4 CORESITE REALTY CORPORATION INDENTURE Dated as of , 20 Trustee TABLE OF CONTENTS PAGE ARTICLE I DEFINITIONS AND INCORPORATION BY REFERENCE 1 Section 1.1 Definitions 1 Section 1.2 Other Definitions 3 Section 1.3 Incorporation by Reference of Trust Indenture Act 4 Section 1.4 Rules of Construction 4 ARTICLE II THE SECURITIES 4 Section 2.1 Issuable in Series 4 Section 2.2 Establishment of

October 19, 2017 S-3ASR

As filed with the Securities and Exchange Commission on October 19, 2017

Table of Contents As filed with the Securities and Exchange Commission on October 19, 2017 Registration No.

October 19, 2017 EX-12.2

Computation of Ratio of Earnings to Combined Fixed Charges and Preferred Stock Dividends

Exhibit 12.2 CoreSite Realty Corporation Computation of Ratio of Earnings to Combined Fixed Charges and Preferred Stock Dividends (unaudited) (in thousands except ratios) Six Months Ended June 30, Year Ended December 31, 2017 2016 2015 2014 2013 2012 Earnings: Net income $ 49,195 $ 81,921 $ 56,859 $ 40,052 $ 31,612 $ 10,716 Add: Fixed charges 14,941 21,484 15,184 14,639 12,016 10,792 Add: Amortiza

October 16, 2017 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 16, 2017 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction of incorporation) (Commissi

October 16, 2017 EX-99.1

CoreSite Realty Corporation Announces Redemption of 7.25% Series A Cumulative Redeemable Preferred Stock

Exhibit 99.1 CoreSite Realty Corporation Announces Redemption of 7.25% Series A Cumulative Redeemable Preferred Stock Denver, CO ? October 16, 2017 ? CoreSite Realty Corporation (NYSE: COR), a premier provider of secure, reliable, high-performance data center and interconnection solutions across the U.S., today announced that it intends to redeem all 4,600,000 outstanding shares of its 7.25% Serie

September 20, 2017 CORRESP

COR / Coresite Realty Corp ESP

September 20, 2017 VIA EDGAR AND OVERNIGHT MAIL Mr. Daniel Gordon Senior Assistant Chief Accountant Office of Real Estate and Commodities Securities and Exchange Commission 100 F Street, N.E. Washington, DC 20549 Re: CoreSite Realty Corporation Form 10-K for the fiscal year ended December 31, 2016 Filed February 10, 2017 File No. 001-34877 Dear Mr. Gordon: CoreSite Realty Corporation (the ?Company

July 28, 2017 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2017 ☐Transition Report Pursuant to Sec

corCurrentFolio10Q Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.

July 27, 2017 EX-99.2

CoreSite Reports Second-Quarter 2017 Financial Results Reflecting Revenue Growth of 23% Year over Year

corEX99-2 Earnings Release and Supplemental Information SECURE, RELIABLE, HIGH-PERFORMANCE DATA CENTER SOLUTIONS ?2017 CoreSite Realty Corporation, All Rights Reserved Table of Contents Table of Contents Overview Earnings Release 3 Company Profile 8 Summary of Financial Data 9 Financial Statements Consolidated Balance Sheets 10 Consolidated Statements of Operations 11 Reconciliations of Net Income

July 27, 2017 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

corCurrentFolio8K 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): July 27, 2017 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction (Commissi

July 27, 2017 EX-99.1

CoreSite Reports Second-Quarter 2017 Financial Results Reflecting Revenue Growth of 23% Year over Year

corEx991 Exhibit 99.1 CoreSite Reports Second-Quarter 2017 Financial Results Reflecting Revenue Growth of 23% Year over Year DENVER, CO ? July 27, 2017 ? CoreSite Realty Corporation (NYSE:COR), a premier provider of secure, reliable, high-performance data center and interconnection solutions across the U.S., today announced financial results for the second quarter ended June 30, 2017. Quarterly Hi

May 26, 2017 EX-24

EX-24

POWER OF ATTORNEY Know all by these presents, that the undersigned hereby constitutes and appoints any one of Derek S.

May 25, 2017 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

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): May 24, 2017 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction of incorporation) (Commissio

May 25, 2017 EX-99.1

Jean Bua Joins CoreSite Realty Corporation’s Board of Directors

Exhibit 99.1 Jean Bua Joins CoreSite Realty Corporation?s Board of Directors Denver, CO ? May 25, 2017 ? CoreSite Realty Corporation (NYSE:COR), a premier provider of secure, reliable, high-performance data center and interconnection solutions across the U.S., today announced that Jean Bua, Executive Vice President and Chief Financial Officer at NETSCOUT SYSTEMS, INC., has been elected as an indep

May 11, 2017 SC 13G/A

COR / Coresite Realty Corp / HEITMAN REAL ESTATE SECURITIES LLC - SC 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 5)* Coresite Realty Corporation (Name of Issuer) Preferred Series A 7.25% (Title of Class of Securities) 21870Q204 (CUSIP Number) April 30, 2017 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant

April 28, 2017 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2017 ☐Transition Report Pursuant to Se

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2017 ☐Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to . Commission file number: 001-34877 CoreS

April 28, 2017 EX-10.1

2017 Executive Short‑Term Incentive Plan.(23)*

Exhibit 10.1 CORESITE REALTY CORPORATION 2017 EXECUTIVE SHORT-TERM INCENTIVE PLAN The 2017 Executive Short-Term Incentive Plan (the “Plan”) is a cash bonus plan in which executives of CoreSite Realty Corporation (the “Company”) or any affiliate are eligible to participate. The Plan provides incentive cash bonuses based on the achievement of goals relating to the financial performance of the Compan

April 27, 2017 8-K/A

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A (Amendment No. 1) 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 27, 2017 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction (Commi

April 27, 2017 EX-99.1

CoreSite Reports First-Quarter 2017 Financial Results Reflecting Revenue Growth of 24% Year over Year

Exhibit 99.1 CORRECTING and REPLACING CoreSite Reports First-Quarter 2017 Financial Results Reflecting Revenue Growth of 24% Year over Year DENVER?(BUSINESS WIRE)?Apr. 27, 2017? Please replace the Consolidated Statements of Operations table due to multiple revisions within the table. The corrected release reads: CoreSite Reports First-Quarter 2017 Financial Results Reflecting Revenue Growth of 24%

April 27, 2017 EX-99.1

CoreSite Reports First-Quarter 2017 Financial Results Reflecting Revenue Growth of 24% Year over Year

corEx991 Exhibit 99.1 CoreSite Reports First-Quarter 2017 Financial Results Reflecting Revenue Growth of 24% Year over Year DENVER, CO – April 27, 2017 – CoreSite Realty Corporation (NYSE:COR), a premier provider of secure, reliable, high-performance data center and interconnection solutions across the U.S., today announced financial results for the first quarter ended March 31, 2017. Quarterly an

April 27, 2017 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

corCurrentFolio8K 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 27, 2017 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction (Commiss

April 27, 2017 EX-99.2

CoreSite Reports First-Quarter 2017 Financial Results Reflecting Revenue Growth of 24% Year over Year

corEX99-2 Earnings Release and Supplemental Information SECURE, RELIABLE, HIGH-PERFORMANCE DATA CENTER SOLUTIONS ?2017 CoreSite Realty Corporation, All Rights Reserved Table of Contents Table of Contents Overview Earnings Release 3 Company Profile 8 Summary of Financial Data 9 Financial Statements Consolidated Balance Sheets 10 Consolidated Statements of Operations 11 Reconciliations of Net Income

April 20, 2017 EX-10.1

Amended and Restated Term Loan Agreement among CoreSite, L.P., as borrower, Royal Bank of Colorado, as administrative agent, on behalf of itself and certain other lenders, and other lenders party thereto, dated as of April 19, 2017.(20)

Exhibit 10.1 EXECUTION VERSION AMENDED AND RESTATED TERM LOAN AGREEMENT DATED AS OF APRIL 19, 2017 by and among CORESITE, L.P., AS BORROWER, ROYAL BANK OF CANADA, THE OTHER LENDERS WHICH ARE PARTIES TO THIS AGREEMENT, OTHER LENDERS THAT MAY BECOME PARTIES TO THIS AGREEMENT, AND ROYAL BANK OF CANADA, AS ADMINISTRATIVE AGENT, WITH REGIONS BANK, AS SYNDICATION AGENT RBC CAPITAL MARKETS,* REGIONS CAPI

April 20, 2017 EX-99.1

CoreSite Realty Corporation Closes $275 Million of New Financing in Two Separate Transactions Increases available liquidity to support on-going growth initiatives across the portfolio

Exhibit 99.1 CoreSite Realty Corporation Closes $275 Million of New Financing in Two Separate Transactions Increases available liquidity to support on-going growth initiatives across the portfolio Denver, CO ? April 20, 2017 ? CoreSite Realty Corporation (NYSE:COR) (?CoreSite?), a premier provider of secure, reliable, high-performance data center and interconnection solutions across the U.S., toda

April 20, 2017 EX-10.2

Third Amendment to Third Amended and Restated Credit Agreement among CoreSite, L.P., as borrower, KeyBank National Association, as administrative agent, on behalf of itself and certain other lenders party thereto, dated as pf April 19. 2017.(22)

EX-10.2 3 a17-116081ex10d2.htm EX-10.2 Exhibit 10.2 THIRD AMENDMENT TO THIRD AMENDED AND RESTATED CREDIT AGREEMENT This Third Amendment to Third Amended and Restated Credit Agreement (this “Amendment”) is made as of this 19th day of April, 2017, among CORESITE, L.P., a Delaware limited partnership (the “Borrower”), KEYBANK NATIONAL ASSOCIATION, as Administrative Agent (the “Agent”), on behalf of i

April 20, 2017 EX-10.3

Note Purchase Agreement among CoreSite, L.P., CoreSite Realty Corporation and the purchasers listed on the Purchasers Schedule thereto, dated as of April 20, 2017.(20)

Exhibit 10.3 EXECUTION VERSION CORESITE, L.P. $175,000,000 3.91% Senior Notes due April 20, 2024 NOTE PURCHASE AGREEMENT Dated April 20, 2017 TABLE OF CONTENTS SECTION HEADING PAGE SECTION 1. AUTHORIZATION OF NOTES 1 SECTION 2. SALE AND PURCHASE OF NOTES 1 Section 2.1. Notes 1 Section 2.2. Parent Guaranty 1 Section 2.3. Subsidiary Guaranties 1 SECTION 3. CLOSING 2 SECTION 4. CONDITIONS TO CLOSING

April 20, 2017 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 20, 2017 (April 19, 2017) Core

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 20, 2017 (April 19, 2017) CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction of incorpora

April 5, 2017 DEFA14A

Coresite Realty DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) o Defin

April 5, 2017 DEF 14A

Coresite Realty DEF 14A

Use these links to rapidly review the document TABLE OF CONTENTS Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

March 10, 2017 SC 13G/A

COR / Coresite Realty Corp / HEITMAN REAL ESTATE SECURITIES LLC - HEITMAN REAL ESTATE SECURITIES LLC SC 13GA NO 4 2-28-2017 (CORESITE REALTY CORPORATION) Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 4)* Coresite Realty Corporation (Name of Issuer) Preferred Series A 7.25% (Title of Class of Securities) 21870Q204 (CUSIP Number) February 28, 2017 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursua

March 9, 2017 EX-3.1

Amended and Restated Bylaws of CoreSite Realty Corporation.(2)

Exhibit 3.1 CORESITE REALTY CORPORATION AMENDED AND RESTATED BYLAWS ARTICLE I OFFICES Section 1. PRINCIPAL OFFICE. The principal office of the Corporation in the State of Maryland shall be located at such place as the Board of Directors may designate. Section 2. ADDITIONAL OFFICES. The Corporation may have additional offices, including a principal executive office, at such places as the Board of D

March 9, 2017 8-K

Coresite Realty 8-K (Current Report/Significant Event)

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): March 8, 2017 CoreSite Realty Corporation (Exact name of registrant as specified in its charter) Maryland 001-34877 27-1925611 (State or other jurisdiction of incorporation) (Commissi

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