X0306 4 2019-08-07 0 0001490892 CoreSite Realty Corp COR 0001501294 Carlyle Realty III, GP, L.L.C. C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE., N.W. SUITE 220 S WASHINGTON DC 20004 0 0 1 0 0001501297 Carlyle Realty III, L.P. C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE., N.W. SUITE 220 S WASHINGTON DC 20004 0 0 1 0 0001501694 CoreSite CRP III Holdings, LLC C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE., N.W. SUITE 220 S WASHINGTON DC 20004 0 0 1 0 0001501300 CRP III AIV GP, L.L.C. C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE., N.W. SUITE 220 S WASHINGTON DC 20004 0 0 1 0 0001501301 CRP III AIV GP, L.P. C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE., N.W. SUITE 220 S WASHINGTON DC 20004 0 0 1 0 0001501512 CRQP III AIV, L.P. C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE., N.W. SUITE 220 S WASHINGTON DC 20004 0 0 1 0 0001641308 CoreSite CRP III Holdings (VCOC), LLC C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE., N.W. SUITE 220 S WASHINGTON DC 20004 0 0 1 0 0001501299 Carlyle Realty IV GP, L.L.C. C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE., N.W. SUITE 220 S WASHINGTON DC 20004 0 0 1 0 0001501302 Carlyle Realty IV, L.P. C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE., N.W. SUITE 220 S WASHINGTON DC 20004 0 0 1 0 0001501695 CoreSite CRP IV Holdings, LLC C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE., N.W. SUITE 220 S WASHINGTON DC 20004 0 0 1 0 Common Stock 2019-08-07 4 M 0 800000 A 800000 I See footnotes Common Stock 2019-08-07 4 S 0 800000 110.74 D 0 I See footnotes Operating Partnership Units 2019-08-07 4 M 0 800000 D Common Stock 800000 10725390 I See footnotes The operating partnership units are redeemable at any time for cash or, at the election of the Issuer, exchangeable for shares of common stock on a one-for-one basis, and have no expiration date. Following the transactions reported herein, consists of (i) 2,082,097 common units held by CoreSite CRP III Holdings, LLC; (ii) 421,780 common units held by CoreSite CRP III Holdings (VCOC), LLC; (iii) 1,459,136 common units held by CoreSite CRP IV Holdings, LLC; (iv) 248,488 common units held by CoreSite CRP IV Holdings (VCOC I), LLC; (v) 638,671 common units held by CoreSite CRP IV Holdings (VCOC II), LLC; and (vi) 5,875,218 common units held by CoreSite CRP V Holdings, LLC. Carlyle Group Management L.L.C. is the general partner of The Carlyle Group L.P., which is a publicly traded entity listed on NASDAQ. The Carlyle Group L.P. is the sole shareholder of Carlyle Holdings I GP Inc., which is the managing member of Carlyle Holdings I GP Sub L.L.C., which is the general partner of Carlyle Holdings I L.P., which is the managing member of TC Group, L.L.C., which is the general partner of TC Group Sub L.P., which is the managing member of each of Carlyle Realty III GP, L.L.C., CRP III AIV GP, L.L.C., Carlyle Realty IV GP, L.L.C., CRP IV AIV GP, L.L.C. and Carlyle Realty V GP, L.L.C. Carlyle Realty III GP, L.L.C. is the general partner of Carlyle Realty III, L.P. which is the manager of CoreSite CRP III Holdings, LLC. CRP III AIV GP, L.L.C. is the general partner of CRP III AIV GP, L.P., which is the general partner of CRQP III AIV, L.P., which is the managing member of CoreSite CRP III Holdings (VCOC), LLC. Carlyle Realty IV GP, L.L.C. is the general partner of Carlyle Realty IV, L.P., which is the manager of CoreSite CRP IV Holdings, LLC. CRP IV AIV GP, L.L.C. is the general partner of CRP IV AIV GP, L.P., which is the general partner of each of CRP IV-A AIV, L.P. and CRQP IV AIV, L.P., which are the managing members of CoreSite CRP IV Holdings (VCOC I), LLC and CoreSite CRP IV Holdings (VCOC II), LLC, respectively. Carlyle Realty V GP, L.L.C. is the general partner of Carlyle Realty V, L.P., which is the manager of CoreSite CRP V Holdings, LLC. Due to the limitations of the electronic filing system Carlyle Group Management L.L.C., The Carlyle Group, L.P., Carlyle Holdings I GP Inc., Carlyle Holdings I GP Sub L.L.C., Carlyle Holdings I L.P., TC Group, L.L.C., TC Group Sub L.P., CRP IV AIV GP, L.L.C., CRP IV AIV GP, L.P., CRP IV-A AIV, L.P., CRQP IV AIV, L.P., CoreSite CRP IV Holdings (VCOC I), LLC, CoreSite CRP IV Holdings (VCOC II), LLC, Carlyle Realty V GP, L.L.C., Carlyle Realty V, L.P. and CoreSite CRP V Holdings, LLC are filing a separate Form 4. Carlyle Realty III GP, L.L.C., By: /s/ Kevin Gasque, Authorized Person 2019-08-09 Carlyle Realty III, L.P., By: /s/ Kevin Gasque, Authorized Person 2019-08-09 CoreSite CRP III Holdings, LLC, By: Carlyle Realty III, L.P., By: /s/ Kevin Gasque, Authorized Person 2019-08-09 CRP III AIV GP, L.L.C., By: /s/ Kevin Gasque, Authorized Person 2019-08-09 CRP III AIV GP, L.P., By: /s/ Kevin Gasque, Authorized Person 2019-08-09 CRQP III AIV, L.P., By: CRP III AIV GP, L.P., its general partner, By: /s/ Kevin Gasque, Authorized Person 2019-08-09 CoreSite CRP III Holdings (VCOC), LLC, By: CRQP III AIV, L.P., its managing member, By: CRP III AIV GP, L.P., its general partner, By: /s/ Kevin Gasque, Authorized Person 2019-08-09 Carlyle Realty IV GP, L.L.C., By: /s/ Kevin Gasque, Authorized Person 2019-08-09 Carlyle Realty IV, L.P., By: /s/ Kevin Gasque, Authorized Person 2019-08-09 CoreSite CRP IV Holdings, LLC, By: Carlyle Realty IV, L.P., By: /s/ Kevin Gasque, Authorized Person 2019-08-09