Condensed Consolidated Statements of Cash Flows (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ (11,241)	$ (5,070)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	53,224	11,848
Amortization of above/below market leases	(1,139)	(584)
Amortization of deferred financing costs	1,185	352
Gain on early extinguishment of debt	(939)
Amortization of share-based compensation	2,265
Amortization of discount to fair market value of acquired loan	687
Bad debt expense	(36)	(82)
Changes in operating assets and liabilities:
Restricted cash	(595)	610
Accounts receivable	(1,678)	4,076
Due to and due from related parties	2	660
Deferred rent receivable	(3,680)	(1,766)
Deferred leasing costs	(4,581)	(4,545)
Other assets	(2,000)	(1,226)
Accounts payable and accrued expenses	10,516	(1,959)
Prepaid rent and other liabilities	2,629	86
Deferred rent payable	1,007	176
Net cash provided by operating activities	45,626	2,576
CASH FLOWS FROM INVESTING ACTIVITIES
Real estate improvements	(94,644)	(46,183)
Assumption of cash balances in connection with the contribution of the CoreSite Acquired Properties		10,269
Changes in reserves for capital improvements	4,964	2,085
Net cash used in investing activities	(89,680)	(33,829)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of common stock		310,960
Offering costs	(17)	(25,019)
Redemption of operating partnership units		(125,513)
Proceeds from mortgage loans payable		70,300
Repayments of mortgage loans payable	(14,113)	(152,600)
Payments of loan fees and costs	(14)	(3,698)
Contributions		33,399
Dividends and distributions	(17,844)	(2,000)
Net cash provided by (used in) financing activities	(31,988)	105,829
Net change in cash and cash equivalents	(76,042)	74,576
Cash and cash equivalents, beginning of period	86,246	7,466
Cash and cash equivalents, end of period	10,204	82,042
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for interest	2,969	2,136
NON-CASH INVESTING AND FINANCING ACTIVITY
Construction costs payable capitalized to real estate	8,872	1,516
Accrual of dividends and distributions	5,996
Contribution of the CoreSite Acquired Properties for Operating Partnership units		$ 316,836