Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues
Rental revenue, net	$ 221,763,000	$ 274,765,000	$ 648,501,000	$ 835,501,000
Escalation and reimbursement	29,103,000	44,749,000	82,554,000	131,561,000
Investment income	48,977,000	47,820,000	143,540,000	148,741,000
Other income	7,702,000	7,266,000	35,761,000	34,328,000
Total revenues	307,545,000	374,600,000	910,356,000	1,150,131,000
Expenses
Operating expenses, including related party expenses of $4,790 and $13,289 in 2018 and $5,505 and $14,941 in 2017, respectively.	56,852,000	75,927,000	172,871,000	221,285,000
Real estate taxes	48,805,000	64,160,000	139,788,000	186,173,000
Ground rent	9,507,000	8,307,000	26,661,000	24,923,000
Interest expense, net of interest income	55,168,000	65,634,000	156,695,000	196,112,000
Amortization of deferred financing costs	2,630,000	4,008,000	9,713,000	12,201,000
Depreciation and amortization	70,747,000	91,728,000	208,049,000	318,916,000
Loan loss and other investment reserves, net of recoveries	1,087,000	0	1,087,000	0
Transaction related costs	163,000	186,000	673,000	365,000
Marketing, general and administrative	20,594,000	23,963,000	66,601,000	72,362,000
Total expenses	265,553,000	333,913,000	782,138,000	1,032,337,000
Equity in net income from unconsolidated joint ventures	971,000	4,078,000	9,709,000	14,104,000
(Loss) gain on sale of real estate, net	(2,504,000)	0	6,227,000	(3,256,000)
Depreciable real estate reserves	(6,691,000)	0	(6,691,000)	(85,336,000)
Purchase price and other fair value adjustments	(3,057,000)	0	57,385,000	0
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	70,937,000	1,030,000	136,522,000	16,166,000
Gain on sale of investment in marketable securities	0	0	0	3,262,000
Loss on early extinguishment of debt	(2,194,000)	0	(2,194,000)	0
Net income	99,454,000	45,795,000	329,176,000	62,734,000
Net (income) loss attributable to noncontrolling interests:
Noncontrolling interests in the Operating Partnership	(4,797,000)	(1,812,000)	(15,656,000)	(2,707,000)
Noncontrolling interests in other partnerships	136,000	1,474,000	(234,000)	18,179,000
Preferred units distributions	(2,846,000)	(2,850,000)	(8,542,000)	(8,551,000)
Net income (loss) attributable to SL Green/SLGOP	91,947,000	42,607,000	304,744,000	69,655,000
Perpetual preferred stock dividends	(3,738,000)	(3,738,000)	(11,213,000)	(11,213,000)
Net income attributable to SL Green common stockholders	$ 88,209,000	$ 38,869,000	$ 293,531,000	$ 58,442,000
Basic Earnings per Share (usd per share)	$ 1.03	$ 0.40	$ 3.34	$ 0.59
Diluted Earnings per Share (usd per share)	$ 1.03	$ 0.40	$ 3.34	$ 0.59
Basic weighted average common shares outstanding (in shares)	85,566	97,783	87,692	99,431
Diluted weighted average common shares and common share equivalents outstanding (in shares)	90,428	102,570	92,580	104,280
Diluted weighted average common units and common unit equivalents outstanding (in shares)	90,428	102,570	92,580	104,280
SL Green Operating Partnership
Revenues
Rental revenue, net	$ 221,763,000	$ 274,765,000	$ 648,501,000	$ 835,501,000
Escalation and reimbursement	29,103,000	44,749,000	82,554,000	131,561,000
Investment income	48,977,000	47,820,000	143,540,000	148,741,000
Other income	7,702,000	7,266,000	35,761,000	34,328,000
Total revenues	307,545,000	374,600,000	910,356,000	1,150,131,000
Expenses
Operating expenses, including related party expenses of $4,790 and $13,289 in 2018 and $5,505 and $14,941 in 2017, respectively.	56,852,000	75,927,000	172,871,000	221,285,000
Real estate taxes	48,805,000	64,160,000	139,788,000	186,173,000
Ground rent	9,507,000	8,307,000	26,661,000	24,923,000
Interest expense, net of interest income	55,168,000	65,634,000	156,695,000	196,112,000
Amortization of deferred financing costs	2,630,000	4,008,000	9,713,000	12,201,000
Depreciation and amortization	70,747,000	91,728,000	208,049,000	318,916,000
Loan loss and other investment reserves, net of recoveries	1,087,000	0	1,087,000	0
Transaction related costs	163,000	186,000	673,000	365,000
Marketing, general and administrative	20,594,000	23,963,000	66,601,000	72,362,000
Total expenses	265,553,000	333,913,000	782,138,000	1,032,337,000
Equity in net income from unconsolidated joint ventures	971,000	4,078,000	9,709,000	14,104,000
(Loss) gain on sale of real estate, net	(2,504,000)	0	6,227,000	(3,256,000)
Depreciable real estate reserves	(6,691,000)	0	(6,691,000)	(85,336,000)
Purchase price and other fair value adjustments	(3,057,000)	0	57,385,000	0
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	70,937,000	1,030,000	136,522,000	16,166,000
Gain on sale of investment in marketable securities	0	0	0	3,262,000
Loss on early extinguishment of debt	(2,194,000)	0	(2,194,000)	0
Net income	99,454,000	45,795,000	329,176,000	62,734,000
Net (income) loss attributable to noncontrolling interests:
Noncontrolling interests in the Operating Partnership			(15,656,000)
Noncontrolling interests in other partnerships	136,000	1,474,000	(234,000)	18,179,000
Preferred units distributions	(2,846,000)	(2,850,000)	(8,542,000)	(8,551,000)
Net income (loss) attributable to SL Green/SLGOP	96,744,000	44,419,000	320,400,000	72,362,000
Perpetual preferred unit distributions	(3,738,000)	(3,738,000)	(11,213,000)	(11,213,000)
Net income attributable to SLGOP common unitholders	$ 93,006,000	$ 40,681,000	$ 309,187,000	$ 61,149,000
Basic Earnings per Unit (usd per share)	$ 1.03	$ 0.40	$ 3.34	$ 0.59
Diluted Earnings per Unit (usd per share)	$ 1.03	$ 0.40	$ 3.34	$ 0.59
Basic weighted average common shares outstanding (in shares)		102,326	92,369	104,001
Basic weighted average common units outstanding (in shares)	90,209
Diluted weighted average common units and common unit equivalents outstanding (in shares)	90,428	102,570	92,580	104,280