CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Data center revenue:
Rental revenue	$ 71,033	$ 64,251
Total operating revenues	129,619	114,921
Operating expenses:
Property operating and maintenance	33,848	29,226
Real estate taxes and insurance	4,937	4,504
Depreciation and amortization	33,776	32,338
Sales and marketing	5,080	4,503
General and administrative	9,185	8,124
Rent	6,400	5,962
Transaction Costs	56
Total operating expenses	93,282	84,657
Operating income	36,337	30,264
Interest expense	(7,738)	(5,107)
Income before income taxes	28,599	25,157
Income tax expense	(33)	(97)
Net income	28,566	25,060
Net income attributable to noncontrolling interests	8,264	6,684
Net income attributable to CoreSite Realty Corporation	20,302	18,376
Preferred stock dividends		(2,084)
Net income attributable to common shares	$ 20,302	$ 16,292
Net income per share attributable to common shares:
Basic (in dollars per share)	$ 0.60	$ 0.49
Diluted (in dollars per share)	$ 0.59	$ 0.48
Weighted average common shares outstanding
Basic (in shares)	33,935,564	33,558,787
Diluted (in shares)	34,164,235	33,981,776
Power Revenue
Data center revenue:
Revenue	$ 36,403	$ 30,861
Interconnection Revenue
Data center revenue:
Revenue	16,560	14,512
Tenant Reimbursement And Other Revenue
Data center revenue:
Revenue	2,572	2,276
Office Light Industrial And Other Revenue
Data center revenue:
Revenue	$ 3,051	$ 3,021