Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues
Rental revenue, net	$ 281,482	$ 318,465	$ 1,043,898	$ 926,020
Escalation and reimbursement	53,130	48,254	147,357	130,630
Investment income	75,396	49,328	174,347	136,588
Other income	6,673	16,019	124,137	44,201
Total revenues	416,681	432,066	1,489,739	1,237,439
Expenses
Operating expenses, including $5,042 and $15,171 in 2016 and $5,238 and $13,415 in 2015 of related party expenses	79,425	78,648	234,269	225,539
Real estate taxes	64,133	61,009	187,931	173,018
Ground rent	8,338	8,252	24,953	24,526
Interest expense, net of interest income	72,565	84,141	256,326	235,694
Amortization of deferred financing costs	4,815	7,160	20,180	19,727
Depreciation and amortization	112,665	146,185	717,015	454,087
Transaction related costs	2,593	5,829	5,987	10,039
Marketing, general and administrative	25,458	23,475	73,974	72,139
Total expenses	369,992	414,699	1,520,635	1,214,769
Income (loss) from continuing operations before equity in net (loss) income from unconsolidated joint ventures, equity in net gain on sale of interest in unconsolidated joint venture/real estate, gain on sale of real estate, net, depreciable real estate reserves, loss on sale of investment in marketable securities and loss on early extinguishment of debt	46,689	17,367	(30,896)	22,670
Equity in net (loss) income from unconsolidated joint ventures	(3,968)	3,627	11,969	10,651
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	225	15,281	43,588	16,050
Gain on sale of real estate, net	397	159,704	210,750	159,704
Depreciable real estate reserves	0	(19,226)	(10,387)	(19,226)
Loss on sale of investment in marketable securities	0	0	(83)	0
Loss on early extinguishment of debt	0	0	0	(49)
Income from continuing operations	43,343	176,753	224,941	189,800
Net income from discontinued operations	0	0	0	427
Gain on sale of discontinued operations	0	0	0	12,983
Net income	43,343	176,753	224,941	203,210
Net income attributable to noncontrolling interests:
Noncontrolling interests in the Operating Partnership	(1,663)	(6,467)	(8,171)	(6,634)
Noncontrolling interests in other partnerships	(836)	(665)	(6,245)	(13,217)
Preferred units distributions	(2,854)	(2,225)	(8,382)	(4,316)
Net income (loss) attributable to SL Green/SLGOP	37,990	167,396	202,143	179,043
Perpetual preferred stock dividends	(3,738)	(3,738)	(11,213)	(11,214)
Amounts attributable to SL Green common stockholders:
Income (loss) from continuing operations before depreciable real estate reserves, gains on sale and discontinued operations	33,657	13,768	(43,041)	4,357
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	215	14,705	41,805	15,439
Net income from discontinued operations	0	0	0	411
Gain on sale of discontinued operations	0	0	0	12,489
Gain on sale of real estate	380	153,687	202,128	153,628
Depreciable real estate reserves	0	(18,502)	(9,962)	(18,495)
Net income attributable to SL Green common stockholders	$ 34,252	$ 163,658	$ 190,930	$ 167,829
Basic earnings per share:
Income (loss) from continuing operations before depreciable real estate reserves, gains on sale and discontinued operations (in usd per share)	$ 0.34	$ 0.14	$ (0.43)	$ 0.04
Equity in net gain on sale of interest in unconsolidated joint venture/real estate (usd per share)	0.00	0.15	0.42	0.16
Net income from discontinued operations (usd per share)	0.00	0.00	0.00	0.00
Gain on sale of discontinued operations (usd per share)	0.00	0.00	0.00	0.13
Gain on sale of real estate (in dollars per share)	0.00	1.54	2.02	1.55
Depreciable Real Estate Reserves, Effect on Earnings, Per Basic Share	0.00	(0.19)	(0.10)	(0.19)
Net income attributable to SL Green common stockholders (usd per share)	0.34	1.64	1.91	1.69
Diluted earnings per share:
Income (loss) from continuing operations before depreciable real estate reserves, gains on sale and discontinued operations (in usd per share)	0.34	0.14	(0.43)	0.04
Equity in net gain on sale of interest in unconsolidated joint venture/real estate (usd per share)	0.00	0.15	0.42	0.16
Net income from discontinued operations (in usd per share)	0.00	0.00	0.00	0.00
Gain on sale of discontinued operations (usd per share)	0.00	0.00	0.00	0.13
Gain on sale of real estate (in dollars per share)	0.00	1.54	2.01	1.54
Depreciable real estate reserves (in dollars per share)	0.00	(0.19)	(0.10)	(0.19)
Net income attributable to SL Green common stockholders (usd per share)	0.34	1.64	1.90	1.68
Dividends per share/unit (usd per share)	$ 0.72	$ 0.60	$ 2.16	$ 1.80
Basic weighted average common shares outstanding (in shares)	100,233	99,621	100,140	99,205
Diluted weighted average common shares and common share equivalents outstanding (in shares)	105,143	103,929	104,761	103,609
SL Green Operating Partnership
Revenues
Rental revenue, net	$ 281,482	$ 318,465	$ 1,043,898	$ 926,020
Escalation and reimbursement	53,130	48,254	147,357	130,630
Investment income	75,396	49,328	174,347	136,588
Other income	6,673	16,019	124,137	44,201
Total revenues	416,681	432,066	1,489,739	1,237,439
Expenses
Operating expenses, including $5,042 and $15,171 in 2016 and $5,238 and $13,415 in 2015 of related party expenses	79,425	78,648	234,269	225,539
Real estate taxes	64,133	61,009	187,931	173,018
Ground rent	8,338	8,252	24,953	24,526
Interest expense, net of interest income	72,565	84,141	256,326	235,694
Amortization of deferred financing costs	4,815	7,160	20,180	19,727
Depreciation and amortization	112,665	146,185	717,015	454,087
Transaction related costs	2,593	5,829	5,987	10,039
Marketing, general and administrative	25,458	23,475	73,974	72,139
Total expenses	369,992	414,699	1,520,635	1,214,769
Income (loss) from continuing operations before equity in net (loss) income from unconsolidated joint ventures, equity in net gain on sale of interest in unconsolidated joint venture/real estate, gain on sale of real estate, net, depreciable real estate reserves, loss on sale of investment in marketable securities and loss on early extinguishment of debt	46,689	17,367	(30,896)	22,670
Equity in net (loss) income from unconsolidated joint ventures	(3,968)	3,627	11,969	10,651
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	225	15,281	43,588	16,050
Gain on sale of real estate, net	397	159,704	210,750	159,704
Depreciable real estate reserves	0	(19,226)	(10,387)	(19,226)
Loss on sale of investment in marketable securities	0	0	(83)	0
Loss on early extinguishment of debt	0	0	0	(49)
Income from continuing operations	43,343	176,753	224,941	189,800
Net income from discontinued operations	0	0	0	427
Gain on sale of discontinued operations	0	0	0	12,983
Net income	43,343	176,753	224,941	203,210
Net income attributable to noncontrolling interests:
Noncontrolling interests in the Operating Partnership			(8,171)
Noncontrolling interests in other partnerships	(836)	(665)	(6,245)	(13,217)
Preferred units distributions	(2,854)	(2,225)	(8,382)	(4,316)
Net income (loss) attributable to SL Green/SLGOP	39,653	173,863	210,314	185,677
Perpetual preferred unit distributions	(3,738)	(3,738)	(11,213)	(11,214)
Net income attributable to SLGOP common unitholders	35,915	170,125	199,101	174,463
Amounts attributable to SL Green common stockholders:
Income (loss) from continuing operations before depreciable real estate reserves, gains on sale and discontinued operations	35,293	14,366	(44,850)	4,525
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	225	15,281	43,588	16,050
Net income from discontinued operations	0	0	0	427
Gain on sale of discontinued operations	0	0	0	12,983
Gain on sale of real estate	397	159,704	210,750	159,704
Depreciable real estate reserves	$ 0	$ (19,226)	$ (10,387)	$ (19,226)
Basic earnings per share:
(Loss) income from continuing operations before gains on sale and discontinued operations (usd per share)	$ 0.34	$ 0.14	$ (0.43)	$ 0.04
Equity in net gain on sale of interest in unconsolidated joint venture/real estate (usd per share)	0.00	0.15	0.42	0.16
Net income from discontinued operations (usd per share)	0.00	0.00	0.00	0.00
Gain on sale of discontinued operations (usd per share)	0.00	0.00	0.00	0.13
Gain on sale of real estate (in dollars per share)	0.00	1.54	2.02	1.55
Depreciable Real Estate Reserves, Effect on Earnings, Per Basic Share	0.00	(0.19)	(0.10)	(0.19)
Net income attributable to SLGOP common unitholders (usd per share)	0.34	1.64	1.91	1.69
Diluted earnings per share:
(Loss) income from continuing operations before gains on sale and discontinued operations (in usd per share)	0.34	0.14	(0.43)	0.04
Equity in net gain on sale of interest in unconsolidated joint venture/real estate (usd per share)	0.00	0.15	0.42	0.16
Net income from discontinued operations (in usd per share)	0.00	0.00	0.00	0.00
Gain on sale of discontinued operations (usd per share)	0.00	0.00	0.00	0.13
Gain on sale of real estate (in dollars per share)	0.00	1.54	2.01	1.54
Depreciable real estate reserves (in dollars per share)	0.00	(0.19)	(0.10)	(0.19)
Net income attributable to SLGOP common unitholders (usd per share)	0.34	1.64	1.90	1.68
Dividends per share/unit (usd per share)	$ 0.72	$ 0.60	$ 2.16	$ 1.80
Basic weighted average common shares outstanding (in shares)	104,730	103,522	104,412	103,129
Basic weighted average common units outstanding (in shares)	104,730	103,522	104,412	103,129
Diluted weighted average common units and common unit equivalents outstanding (in shares)	105,143	103,929	104,761	103,609