CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Data center revenue:
Rental revenue	$ 66,657	$ 54,219	$ 195,761	$ 156,954
Power revenue	35,110	28,844	98,381	80,819
Interconnection revenue	16,201	13,374	46,038	39,093
Tenant reimbursement and other	2,185	2,826	6,790	6,982
Office, light-industrial and other revenue	2,915	2,011	8,905	5,996
Total operating revenues	123,068	101,274	355,875	289,844
Operating expenses:
Property operating and maintenance	37,091	28,283	98,098	78,522
Real estate taxes and insurance	2,622	3,524	10,950	9,659
Depreciation and amortization	32,077	26,981	96,622	77,978
Sales and marketing	4,643	4,465	13,560	13,187
General and administrative	9,759	9,432	27,391	26,970
Rent	6,077	5,967	17,970	16,718
Transaction Costs		117	139	126
Total operating expenses	92,269	78,769	264,730	223,160
Operating income	30,799	22,505	91,145	66,684
Interest expense	(6,447)	(3,188)	(17,512)	(7,879)
Income before income taxes	24,352	19,317	73,633	58,805
Income tax benefit (expense)	(64)	2	(150)	(45)
Net income	24,288	19,319	73,483	58,760
Net income attributable to noncontrolling interests	6,446	5,055	19,537	17,031
Net income attributable to CoreSite Realty Corporation	17,842	14,264	53,946	41,729
Preferred stock dividends	(2,084)	(2,084)	(6,253)	(6,253)
Net income attributable to common shares	$ 15,758	$ 12,180	$ 47,693	$ 35,476
Net income per share attributable to common shares:
Basic (in dollars per share)	$ 0.47	$ 0.36	$ 1.41	$ 1.11
Diluted (in dollars per share)	$ 0.46	$ 0.36	$ 1.40	$ 1.10
Weighted average common shares outstanding
Basic (in shares)	33,878,881	33,425,762	33,758,971	31,906,000
Diluted (in shares)	34,114,169	33,912,155	34,033,842	32,361,367