Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income	$ 28,630	$ 16,488	$ 182,243	$ 659,567
Other comprehensive income (loss):
Net unrealized gain (loss) on derivative instruments	190	(1,398)	493	(4,389)
SL Green's share of joint venture net unrealized gain (loss) on derivative instruments	(292)	(3,070)	(1,128)	319
Unrealized gain (loss) on marketable securities	(825)	1,528	(597)	2,094
Other comprehensive income (loss)	(927)	(2,940)	(1,232)	(1,976)
Comprehensive income	27,703	13,548	181,011	657,591
Net income attributable to noncontrolling interests	(2,973)	(1,864)	(13,201)	(22,510)
Other comprehensive income attributable to noncontrolling interests	59	67	396	173
Preferred stock redemption costs	(10,010)		(10,010)
Comprehensive income attributable to SL Green	$ 14,779	$ 11,751	$ 158,196	$ 635,254