Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues
Rental revenue, net	$ 961,935	$ 782,530	$ 746,579
Escalation and reimbursement	145,596	118,212	119,029
Investment and preferred equity income	120,418	147,926	65,608
Other income	35,479	35,718	47,145
Total revenues	1,263,428	1,084,386	978,361
Expenses
Operating expenses (including $16,126 (2011), $14,234 (2010) and $14,882 (2009) paid to affiliates)	263,709	224,693	209,272
Real estate taxes	174,454	145,830	136,636
Ground rent	32,919	31,191	31,826
Interest expense, net of interest income	285,917	230,648	232,655
Amortization of deferred financing costs	14,118	9,046	7,065
Depreciation and amortization	277,345	225,193	220,396
Loan loss and other investment reserves, net of recoveries	6,722	17,751	150,510
Transaction related costs	5,561	11,849
Marketing, general and administrative	80,103	75,946	73,992
Total expenses	1,140,848	972,147	1,062,352
Income (loss) from continuing operations before equity in net income of unconsolidated joint ventures, gains on sale, purchase price fair value adjustment, noncontrolling interests and discontinued operations	122,580	112,239	(83,991)
Equity in net income from unconsolidated joint ventures	1,583	39,607	62,878
Equity in net gain on sale of interest in unconsolidated joint venture/ real estate	2,918	128,921	6,691
Purchase price fair value adjustment	498,195
Gain (loss) on sale of investment in marketable securities	4,866	490	(396)
Depreciable real estate reserves	(5,789)	(2,750)
Gain (loss) on early extinguishment of debt	904	(1,900)	86,006
Income from continuing operations	625,257	276,607	71,188
Net income from discontinued operations	5,780	7,064	7,318
Gain (loss) on sale of discontinued operations	46,085	35,485	(6,841)
Net income	677,122	319,156	71,665
Net income attributable to noncontrolling interests in the operating partnership	(14,629)	(4,574)	(1,221)
Net income attributable to noncontrolling interests in other partnerships	(15,083)	(14,007)	(12,900)
Net income attributable to SL Green	647,410	300,575	57,544
Preferred stock dividends	(30,178)	(29,749)	(19,875)
Net income attributable to SL Green common stockholders	617,232	270,826	37,669
Amounts attributable to SL Green common stockholders:
Income (loss) from continuing operations	563,718	102,208	30,724
Net income from discontinued operations	5,646	6,946	7,091
Gain (loss) on sale of discontinued operations	45,018	34,894	(6,630)
Gain on sale of unconsolidated joint ventures/ real estate	2,850	126,778	6,484
Net income	$ 617,232	$ 270,826	$ 37,669
Basic earnings per share:
Net income (loss) from continuing operations before gains on sale and discontinued operations (in dollars per share)	$ 6.73	$ 1.31	$ 0.45
Net income from discontinued operations (in dollars per share)	$ 0.07	$ 0.09	$ 0.10
Gain (loss) on sale of discontinued operations (in dollars per share)	$ 0.54	$ 0.45	$ (0.10)
Equity in net gain on sale of interest in unconsolidated joint venture/ real estate (in dollars per share)	$ 0.03	$ 1.62	$ 0.09
Net income attributable to SL Green common stockholders (in dollars per share)	$ 7.37	$ 3.47	$ 0.54
Diluted earnings per share:
Net income (loss) from continuing operations before gains on sale and discontinued operations (in dollars per share)	$ 6.70	$ 1.30	$ 0.45
Net income from discontinued operations (in dollars per share)	$ 0.07	$ 0.09	$ 0.10
Gain (loss) on sale of discontinued operations (in dollars per share)	$ 0.53	$ 0.44	$ (0.10)
Equity in net gain on sale of interest in unconsolidated joint venture/ real estate (in dollars per share)	$ 0.03	$ 1.62	$ 0.09
Net income attributable to SL Green common stockholders (in dollars per share)	$ 7.33	$ 3.45	$ 0.54
Basic weighted average common shares outstanding (in shares)	83,762	78,101	69,735
Diluted weighted average common shares and common share equivalents outstanding (in shares)	86,244	79,761	72,044