Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues
Rental revenue, net	$ 274,765	$ 281,482	$ 835,501	$ 1,043,898
Escalation and reimbursement	44,749	53,130	131,561	147,357
Investment income	47,820	75,396	148,741	174,347
Other income	7,266	6,673	34,328	124,137
Total revenues	374,600	416,681	1,150,131	1,489,739
Expenses
Operating expenses, including related party expenses of $5,505 and $14,941 in 2017 and $5,042 and $15,171 in 2016.	75,927	79,425	221,285	234,269
Real estate taxes	64,160	64,133	186,173	187,931
Ground rent	8,307	8,338	24,923	24,953
Interest expense, net of interest income	65,634	72,565	196,112	256,326
Amortization of deferred financing costs	4,008	4,815	12,201	20,180
Depreciation and amortization	91,728	112,665	318,916	717,015
Transaction related costs	186	2,593	365	5,987
Marketing, general and administrative	23,963	25,458	72,362	73,974
Total expenses	333,913	369,992	1,032,337	1,520,635
Income (loss) before equity in net income (loss) from unconsolidated joint ventures, equity in net gain on sale of interest in unconsolidated joint venture/real estate, gain (loss) on sale of real estate, net, depreciable real estate reserves, and gain (loss) on sale of investment in marketable securities	40,687	46,689	117,794	(30,896)
Equity in net income (loss) from unconsolidated joint ventures	4,078	(3,968)	14,104	11,969
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	1,030	225	16,166	43,588
Gain (loss) on sale of real estate, net	0	397	(3,256)	210,750
Depreciable real estate reserves	0	0	(85,336)	(10,387)
Gain (loss) on sale of investment in marketable securities	0	0	3,262	(83)
Net income	45,795	43,343	62,734	224,941
Net (income) loss attributable to noncontrolling interests:
Noncontrolling interests in the Operating Partnership	(1,812)	(1,663)	(2,707)	(8,171)
Noncontrolling interests in other partnerships	1,474	(836)	18,179	(6,245)
Preferred units distributions	(2,850)	(2,854)	(8,551)	(8,382)
Net income (loss) attributable to SL Green/SLGOP	42,607	37,990	69,655	202,143
Perpetual preferred stock dividends	(3,738)	(3,738)	(11,213)	(11,213)
Amounts attributable to SL Green common stockholders:
Income (loss) before depreciable real estate reserves and gains (losses) on sale	37,885	33,657	127,685	(43,041)
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	984	215	15,456	41,805
Gain (loss) on sale of real estate, net	0	380	(3,113)	202,128
Depreciable real estate reserves	0	0	(81,586)	(9,962)
Net income attributable to SL Green common stockholders	$ 38,869	$ 34,252	$ 58,442	$ 190,930
Basic earnings per share:
Income (loss) before depreciable real estate reserves and gains (losses) on sale (in dollars per share)	$ 0.39	$ 0.34	$ 1.28	$ (0.43)
Equity in net gain on sale of interest in unconsolidated joint venture/real estate (in dollars per share)	0.01	0.00	0.16	0.42
Gain (loss) on sale of real estate, net	0.00	0.00	(0.03)	2.02
Depreciable real estate reserves	0.00	0.00	(0.82)	(0.10)
Net income attributable to SL Green common stockholders (usd per share)	0.40	0.34	0.59	1.91
Diluted earnings per share:
Income (loss) before depreciable real estate reserves and gains (losses) on sale (in dollars per share)	0.39	0.34	1.28	(0.43)
Equity in net gain on sale of interest in unconsolidated joint venture/real estate (in dollars per share)	0.01	0.00	0.16	0.42
Gain on sale of real estate (in dollars per share)	0.00	0.00	(0.03)	2.01
Depreciable real estate reserves (in dollars per share)	0.00	0.00	(0.82)	(0.10)
Net income attributable to SL Green common stockholders (usd per share)	0.40	0.34	0.59	1.90
Dividends per share/unit (usd per share)	$ 0.775	$ 0.72	$ 2.325	$ 2.16
Basic weighted average common shares outstanding (in shares)	97,783	100,233	99,431	100,140
Diluted weighted average common shares and common share equivalents outstanding (in shares)	102,570	105,143	104,280	104,761
SL Green Operating Partnership
Revenues
Rental revenue, net	$ 274,765	$ 281,482	$ 835,501	$ 1,043,898
Escalation and reimbursement	44,749	53,130	131,561	147,357
Investment income	47,820	75,396	148,741	174,347
Other income	7,266	6,673	34,328	124,137
Total revenues	374,600	416,681	1,150,131	1,489,739
Expenses
Operating expenses, including related party expenses of $5,505 and $14,941 in 2017 and $5,042 and $15,171 in 2016.	75,927	79,425	221,285	234,269
Real estate taxes	64,160	64,133	186,173	187,931
Ground rent	8,307	8,338	24,923	24,953
Interest expense, net of interest income	65,634	72,565	196,112	256,326
Amortization of deferred financing costs	4,008	4,815	12,201	20,180
Depreciation and amortization	91,728	112,665	318,916	717,015
Transaction related costs	186	2,593	365	5,987
Marketing, general and administrative	23,963	25,458	72,362	73,974
Total expenses	333,913	369,992	1,032,337	1,520,635
Income (loss) before equity in net income (loss) from unconsolidated joint ventures, equity in net gain on sale of interest in unconsolidated joint venture/real estate, gain (loss) on sale of real estate, net, depreciable real estate reserves, and gain (loss) on sale of investment in marketable securities	40,687	46,689	117,794	(30,896)
Equity in net income (loss) from unconsolidated joint ventures	4,078	(3,968)	14,104	11,969
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	1,030	225	16,166	43,588
Gain (loss) on sale of real estate, net	0	397	(3,256)	210,750
Depreciable real estate reserves	0	0	(85,336)	(10,387)
Gain (loss) on sale of investment in marketable securities	0	0	3,262	(83)
Net income	45,795	43,343	62,734	224,941
Net (income) loss attributable to noncontrolling interests:
Noncontrolling interests in the Operating Partnership			(2,707)
Noncontrolling interests in other partnerships	1,474	(836)	18,179	(6,245)
Preferred units distributions	(2,850)	(2,854)	(8,551)	(8,382)
Net income (loss) attributable to SL Green/SLGOP	44,419	39,653	72,362	210,314
Perpetual preferred unit distributions	(3,738)	(3,738)	(11,213)	(11,213)
Net income attributable to SLGOP common unitholders	40,681	35,915	61,149	199,101
Amounts attributable to SL Green common stockholders:
Income (loss) before depreciable real estate reserves and gains (losses) on sale	39,651	35,293	133,575	(44,850)
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	1,030	225	16,166	43,588
Gain (loss) on sale of real estate, net	0	397	(3,256)	210,750
Depreciable real estate reserves	$ 0	$ 0	$ (85,336)	$ (10,387)
Basic earnings per share:
Income (loss) before depreciable real estate reserves and gains (losses) on sale (in dollars per share)	$ 0.39	$ 0.34	$ 1.28	$ (0.43)
Equity in net gain on sale of interest in unconsolidated joint venture/real estate (in dollars per share)	0.01	0.00	0.16	0.42
Gain (loss) on sale of real estate, net	0.00	0.00	(0.03)	2.02
Depreciable real estate reserves	0.00	0.00	(0.82)	(0.10)
Net income attributable to SLGOP common unitholders (usd per share)	0.40	0.34	0.59	1.91
Diluted earnings per share:
Income (loss) before depreciable real estate reserves and gains (losses) on sale (in dollars per share)	0.39	0.34	1.28	(0.43)
Equity in net gain on sale of interest in unconsolidated joint venture/real estate (in dollars per share)	0.01	0.00	0.16	0.42
Gain on sale of real estate (in dollars per share)	0.00	0.00	(0.03)	2.01
Depreciable real estate reserves (in dollars per share)	0.00	0.00	(0.82)	(0.10)
Net income attributable to SLGOP common unitholders (usd per share)	0.40	0.34	0.59	1.90
Dividends per share/unit (usd per share)	$ 0.775	$ 0.72	$ 2.325	$ 2.16
Basic weighted average common shares outstanding (in shares)	102,326	104,730	104,001	104,412
Basic weighted average common units outstanding (in shares)	102,326	104,730	104,001	104,412
Diluted weighted average common units and common unit equivalents outstanding (in shares)	102,570	105,143	104,280	104,761