Exhibit 99.1

Joint Filer Information

Date of Event Requiring Statement:	July 31, 2011
Issuer Name and Ticker or Trading Symbol:	CoreSite Realty Corp [ COR ]
Designated Filer:	DBD Investors V Holdings, L.L.C.
Other Joint Filers:	TCG Holdings II, L.P. TC Group Investment Holdings, L.P. Carlyle Realty III, GP, L.L.C. Carlyle Realty III, L.P. CoreSite CRP III Holdings, LLC Carlyle Realty V GP, L.L.C. Carlyle Realty V, L.P. CoreSite CRP V Holdings, LLC
Addresses:	The address of the principal business and principal office of each of DBD Investors V Holdings, L.L.C., TCG Holdings II, L.P., TC Group Investment Holdings, L.P., Carlyle Realty III, GP, L.L.C., Carlyle Realty III, L.P., CoreSite CRP III Holdings, LLC, Carlyle Realty V GP, L.L.C., Carlyle Realty V, L.P. and CoreSite CRP V Holdings, LLC is c/o The Carlyle Group, 1001 Pennsylvania Ave., N.W., Suite 220 South, Washington, DC 20004-2505.
Signatures:
Dated: August 2, 2011
	TCG HOLDINGS II, L.P.
	by: DBD Investors V, L.L.C., its General Partner by: DBD Investors V Holdings, L.L.C., its Managing Member
	by: /s/ R. Rainey Hoffman, attorney-in-fact Name: David M. Rubenstein Title: Managing Director
	TC GROUP INVESTMENT HOLDINGS, L.P.
	by: TCG Holdings II, L.P., its General Partner by: DBD Investors V, L.L.C., its General Partner by: DBD Investors V Holdings, L.L.C., its Managing Member
	by: /s/ R. Rainey Hoffman, attorney-in-fact Name: David M. Rubenstein Title: Managing Director
	CARLYLE REALTY III, GP, L.L.C.
	by: TC Group Investment Holdings, L.P., its Managing Member by: TCG Holdings II, L.P., its General Partner by: DBD Investors V, L.L.C., its General Partner by: DBD Investors V Holdings, L.L.C., its Managing Member
	by: /s/ R. Rainey Hoffman, attorney-in-fact Name: David M. Rubenstein Title: Managing Director
	CARLYLE REALTY III, L.P.
	by: Carlyle Realty III, GP, L.L.C., its General Partner by: TC Group Investment Holdings, L.P., its Managing Member by: TCG Holdings II, L.P., its General Partner by: DBD Investors V, L.L.C., its General Partner by: DBD Investors V Holdings, L.L.C., its Managing Member
	by: /s/ R. Rainey Hoffman, attorney-in-fact Name: David M. Rubenstein Title: Managing Director
	CORESITE CRP III HOLDINGS, LLC
	by: Carlyle Realty III, L.P., its Managing Member by: Carlyle Realty III, GP, L.L.C., its General Partner by: TC Group Investment Holdings, L.P., its Managing Member by: TCG Holdings II, L.P., its General Partner by: DBD Investors V, L.L.C., its General Partner by: DBD Investors V Holdings, L.L.C., its Managing Member
	by: /s/ R. Rainey Hoffman, attorney-in-fact Name: David M. Rubenstein Title: Managing Director
	CARLYLE REALTY V GP, L.L.C.
	by: TC Group Investment Holdings, L.P., its Managing Member by: TCG Holdings II, L.P., its General Partner by: DBD Investors V, L.L.C., its General Partner by: DBD Investors V Holdings, L.L.C., its Managing Member
	by: /s/ R. Rainey Hoffman, attorney-in-fact Name: David M. Rubenstein Title: Managing Director
	CARLYLE REALTY V, L.P.
	by: Carlyle Realty V, GP, L.L.C., its General Partner by: TC Group Investment Holdings, L.P., its Managing Member by: TCG Holdings II, L.P., its General Partner by: DBD Investors V, L.L.C., its General Partner by: DBD Investors V Holdings, L.L.C., its Managing Member
	by: /s/ R. Rainey Hoffman, attorney-in-fact Name: David M. Rubenstein Title: Managing Director
	CORESITE CRP V HOLDINGS, LLC
	by: Carlyle Realty V, L.P., its Managing Member by: Carlyle Realty V, GP, L.L.C., its General Partner by: TC Group Investment Holdings, L.P., its Managing Member by: TCG Holdings II, L.P., its General Partner by: DBD Investors V, L.L.C., its General Partner by: DBD Investors V Holdings, L.L.C., its Managing Member
	by: /s/ R. Rainey Hoffman, attorney-in-fact Name: David M. Rubenstein Title: Managing Director