CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Data center revenue:
Rental revenue	$ 44,824	$ 36,938	$ 86,147	$ 71,837
Power revenue	21,792	16,575	41,461	32,577
Interconnection revenue	10,595	8,591	20,810	16,650
Tenant reimbursement and other	2,276	1,627	3,692	4,383
Office, light-industrial and other revenue	1,969	1,951	4,103	3,966
Total operating revenues	81,456	65,682	156,213	129,413
Operating expenses:
Property operating and maintenance	22,204	18,534	41,984	34,823
Real estate taxes and insurance	3,270	(980)	5,205	1,986
Depreciation and amortization	24,046	19,504	46,862	37,386
Sales and marketing	4,256	3,747	8,038	7,335
General and administrative	7,952	6,732	15,817	14,437
Rent	5,007	5,070	10,250	10,136
Impairment of internal-use software		1,037		1,959
Transaction costs	45	9	45	13
Total operating expenses	66,780	53,653	128,201	108,075
Operating income	14,676	12,029	28,012	21,338
Gain on real estate disposal			36
Interest income	2	2	4	4
Interest expense	(1,730)	(1,415)	(2,995)	(2,588)
Income before income taxes	12,948	10,616	25,057	18,754
Income tax benefit (expense)	(66)	22	(115)	2
Net income	12,882	10,638	24,942	18,756
Net income attributable to noncontrolling interests	5,259	4,670	10,667	7,971
Net income attributable to CoreSite Realty Corporation	7,623	5,968	14,275	10,785
Preferred stock dividends	(2,085)	(2,085)	(4,169)	(4,169)
Net income attributable to common shares	$ 5,538	$ 3,883	$ 10,106	$ 6,616
Net income per share attributable to common shares:
Basic (in dollars per share)	$ 0.23	$ 0.18	$ 0.44	$ 0.31
Diluted (in dollars per share)	$ 0.22	$ 0.18	$ 0.43	$ 0.31
Weighted average common shares outstanding
Basic (in shares)	24,536,583	21,131,077	22,963,111	21,062,299
Diluted (in shares)	25,055,195	21,604,730	23,525,316	21,599,749