Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Consolidated Statements of Comprehensive Income
Net income	$ 30,337	$ 35,157
Other comprehensive income:
Net unrealized loss on derivative instruments	(41)	(146)
Reclassification of net realized loss on derivatives designated as cashflow hedges into interest expense	468	460
SL Green's share of joint venture net unrealized gain on derivative instruments	221	58
Reclassification of SL Green's share of joint venture net realized loss on derivatives designated as cashflow hedges into equity in net income from unconsolidated joint ventures	1,240	2,743
Unrealized gain on marketable securities	1,641	770
Other comprehensive income	3,529	3,885
Comprehensive income	33,866	39,042
Net income attributable to noncontrolling interests	(4,021)	(2,356)
Other comprehensive (loss) income attributable to noncontrolling interests in the Operating Partnership	(59)	184
Comprehensive income attributable to SL Green common stockholders	$ 29,786	$ 36,870