CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Data center revenue:
Rental revenue	$ 74,143	$ 64,853	$ 145,176	$ 129,104
Total operating revenues	136,447	117,886	266,066	232,807
Operating expenses:
Property operating and maintenance	37,861	31,781	71,709	61,007
Real estate taxes and insurance	4,693	3,824	9,630	8,328
Depreciation and amortization	35,558	32,207	69,334	64,545
Sales and marketing	5,369	4,414	10,449	8,917
General and administrative	10,297	9,508	19,482	17,632
Rent	6,547	5,931	12,947	11,893
Transaction Costs	19	139	75	139
Total operating expenses	100,344	87,804	193,626	172,461
Operating income	36,103	30,082	72,440	60,346
Interest expense	(8,907)	(5,958)	(16,645)	(11,065)
Income before income taxes	27,196	24,124	55,795	49,281
Income tax benefit (expense)	83	11	50	(86)
Net income	27,279	24,135	55,845	49,195
Net income attributable to noncontrolling interests	7,890	6,407	16,154	13,091
Net income attributable to CoreSite Realty Corporation	19,389	17,728	39,691	36,104
Preferred stock dividends		(2,085)		(4,169)
Net income attributable to common shares	$ 19,389	$ 15,643	$ 39,691	$ 31,935
Net income per share attributable to common shares:
Basic (in dollars per share)	$ 0.57	$ 0.46	$ 1.17	$ 0.95
Diluted (in dollars per share)	$ 0.57	$ 0.46	$ 1.16	$ 0.94
Weighted average common shares outstanding
Basic (in shares)	34,049,391	33,835,727	33,992,792	33,698,022
Diluted (in shares)	34,220,321	34,053,816	34,183,408	34,009,930
Power Revenue
Data center revenue:
Revenue	$ 38,986	$ 32,410	$ 75,389	$ 63,271
Interconnection Revenue
Data center revenue:
Revenue	17,422	15,325	33,982	29,837
Tenant Reimbursement And Other Revenue
Data center revenue:
Revenue	3,018	2,329	5,590	4,605
Office Light Industrial And Other Revenue
Data center revenue:
Revenue	$ 2,878	$ 2,969	$ 5,929	$ 5,990