Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Consolidated Statements of Comprehensive Income
Net income	$ 31,248	$ 118,457	$ 61,585	$ 153,614
Other comprehensive income (loss):
Net unrealized gain (loss) on derivative instruments	181	(477)	140	(623)
Reclassification of net realized loss on derivatives designated as cashflow hedges into interest expense	470	466	938	926
SL Green's share of joint venture net unrealized gain (loss) on derivative instruments	7,888	(6,388)	8,109	(6,330)
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	1,260	2,751	2,500	5,494
Unrealized (loss) gain on marketable securities	(1,848)	(542)	(207)	228
Other comprehensive income (loss)	7,951	(4,190)	11,480	(305)
Comprehensive income	39,199	114,267	73,065	153,309
Net income attributable to noncontrolling interests	(3,813)	(7,873)	(7,834)	(10,229)
Other comprehensive (income) loss attributable to noncontrolling interests in the Operating Partnership	(456)	153	(515)	337
Comprehensive income attributable to SL Green common stockholders	$ 34,930	$ 106,547	$ 64,716	$ 143,417