X0306 4 2015-11-03 0 0001490892 CoreSite Realty Corp COR 0001548624 Carlyle Group Management L.L.C. C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE. NW, SUITE 220S WASHINGTON DC 20004 0 0 1 0 0001527166 Carlyle Group L.P. C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE. NW, SUITE 220S WASHINGTON DC 20004 0 0 1 0 0001548626 Carlyle Holdings I GP Inc. C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE. NW, SUITE 220S WASHINGTON DC 20004 0 0 1 0 0001548627 Carlyle Holdings I GP Sub L.L.C. C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE. NW, SUITE 220S WASHINGTON DC 20004 0 0 1 0 0001548628 Carlyle Holdings I L.P. C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE. NW, SUITE 220S WASHINGTON DC 20004 0 0 1 0 0000933790 TC Group, LLC C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE. NW, SUITE 220S WASHINGTON DC 20004 0 0 1 0 0001548639 TC Group Sub L.P. C/O THE CARLYLE GROUP, 1001 PENNSYLVANIA AVE. NW, SUITE 220S WASHINGTON DC 20004 0 0 1 0 Common Stock 2015-11-03 4 M 0 4000000 A 4000000 I See footnotes Common Stock 2015-11-03 4 S 0 4000000 54.56 D 0 I See footnotes Operating Partnership Units 2015-11-03 4 M 0 4000000 D Common Stock 4000000 16775390 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) 4,129,993 common units held by CoreSite CRP III Holdings, LLC; (ii) 836,633 common units held by CoreSite CRP III Holdings (VCOC), LLC; (iii) 2,894,301 common units held by CoreSite CRP IV Holdings, LLC; (iv) 492,892 common units held by CoreSite CRP IV Holdings (VCOC I), LLC; (v) 1,266,850 common units held by CoreSite CRP IV Holdings (VCOC II), LLC; and (vi) 7,154,721 common units held by CoreSite CRP V Holdings, LLC. Carlyle Group Managment 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 Realty III GP, L.L.C., Carlyle Realty III, L.P., CoreSite CRP III Holdings, LLC, CRP III AIV GP, L.L.C., CRP III AIV GP, L.P., CRQP III AIV, L.P., CoreSite CRP III Holdings (VCOC), LLC, Carlyle Realty IV GP, L.L.C., Carlyle Realty IV, L.P., CoreSite CRP IV Holdings, LLC, 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. /s/ Thomas B. Mayrhofer, attorney-in-fact for Daniel A. D'Aniello, Chairman 2015-11-05