10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

______________________________________________________________________

FORM 10-Q

xQUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2017

OR

oTRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                to                

Commission File Number: 1-13199 (SL Green Realty Corp.)

Commission File Number: 33-167793-02 (SL Green Operating Partnership, L.P.)

______________________________________________________________________

SL GREEN REALTY CORP.

SL GREEN OPERATING PARTNERSHIP, L.P.

(Exact name of registrant as specified in its charter)

______________________________________________________________________

SL Green Realty Corp.	Maryland	13-3956755
SL Green Operating Partnership, L.P.	Delaware	13-3960938
	(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

420 Lexington Avenue, New York, NY 10170

(Address of principal executive offices—Zip Code)

(212) 594-2700

(Registrant's telephone number, including area code)

______________________________________________________________________

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. 

SL Green Realty Corp.    Yes x    No oSL Green Operating Partnership, L.P.    Yes x    No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). 

SL Green Realty Corp.     Yes x    No oSL Green Operating Partnership, L.P.    Yes x    No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

SL Green Realty Corp.

Large accelerated filer	x		Accelerated filer	o
Non-accelerated filer	o	(Do not check if a smaller reporting company)
Smaller Reporting Company	o		Emerging Growth Company	o
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.				o

SL Green Operating Partnership, L.P.

Large accelerated filer	o		Accelerated filer	o
Non-accelerated filer	x	(Do not check if a smaller reporting company)
Smaller Reporting Company	o		Emerging Growth Company	o
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.				o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). 

SL Green Realty Corp.    Yes o    No xSL Green Operating Partnership, L.P.    Yes o    No x

As of November 7, 2017, 98,265,715 shares of SL Green Realty Corp.'s common stock, par value $0.01 per share, were outstanding. As of November 7, 2017, 1,497,224 common units of limited partnership interest of SL Green Operating Partnership, L.P. were held by non-affiliates. There is no established trading market for such units.

EXPLANATORY NOTE

This report combines the quarterly reports on Form 10-Q for the period ended September 30, 2017 of SL Green Realty Corp. and SL Green Operating Partnership, L.P. Unless stated otherwise or the context otherwise requires, references to "SL Green Realty Corp.," the "Company" or "SL Green" mean SL Green Realty Corp. and its consolidated subsidiaries; and references to "SL Green Operating Partnership, L.P.," the "Operating Partnership" or "SLGOP" mean SL Green Operating Partnership, L.P. and its consolidated subsidiaries. The terms "we," "our" and "us" mean the Company and all the entities owned or controlled by the Company, including the Operating Partnership.

The Company is a Maryland corporation which operates as a self-administered and self-managed real estate investment trust, or REIT, and is the sole managing general partner of the Operating Partnership. As a general partner of the Operating Partnership, the Company has full, exclusive and complete responsibility and discretion in the day-to-day management and control of the Operating Partnership.

As of September 30, 2017 the Company owns 95.55% of the outstanding general and limited partnership interest in the Operating Partnership. The Company also owns 9,200,000 Series I Preferred Units of the Operating Partnership. As of September 30, 2017, noncontrolling investors held, in aggregate, a 4.45% limited partnership interest in the Operating Partnership. We refer to these interests as the noncontrolling interests in the Operating Partnership.

The Company and the Operating Partnership are managed and operated as one entity. The financial results of the Operating Partnership are consolidated into the financial statements of the Company. The Company has no significant assets other than its investment in the Operating Partnership. Substantially all of our assets are held by, and our operations are conducted through, the Operating Partnership. Therefore, the assets and liabilities of the Company and the Operating Partnership are substantially the same.

Noncontrolling interests in the Operating Partnership, stockholders' equity of the Company and partners' capital of the Operating Partnership are the main areas of difference between the consolidated financial statements of the Company and those of the Operating Partnership. The common limited partnership interests in the Operating Partnership not owned by the Company are accounted as noncontrolling interests, within mezzanine equity, in the Company's and the Operating Partnership's consolidated financial statements.

We believe combining the quarterly reports on Form 10-Q of the Company and the Operating Partnership into this single report results in the following benefits:

• Combined reports enhance investors' understanding of the Company and the Operating Partnership by enabling investors to view the business as a whole in the same manner as management views and operates the business;

• Combined reports eliminate duplicative disclosure and provides a more streamlined and readable presentation since a substantial portion of the Company's disclosure applies to both the Company and the Operating Partnership; and

• Combined reports create time and cost efficiencies through the preparation of one combined report instead of two separate reports.

To help investors understand the significant differences between the Company and the Operating Partnership, this report presents the following separate sections for each of the Company and the Operating Partnership:

• consolidated financial statements;

• the following notes to the consolidated financial statements:

◦ Note 11, Noncontrolling Interests on the Company’s Consolidated Financial Statements;

◦ Note 12, Stockholders' Equity of the Company;

◦ Note 13, Partners' Capital of the Operating Partnership.

This report also includes separate Part I, Item 4. Controls and Procedures sections and separate Exhibit 31 and 32 certifications for each of the Company and the Operating Partnership, respectively, in order to establish that the Chief Executive Officer and the Chief Financial Officer of the Company, in both their capacity as the principal executive officer and principal financial officer of the Company and the principal executive officer and principal financial officer of the general partner of the Operating Partnership, have made the requisite certifications and that the Company and the Operating Partnership are compliant with Rule 13a-15 and Rule 15d-15 of the Securities Exchange Act of 1934, as amended.

SL GREEN REALTY CORP. AND SL GREEN OPERATING PARTNERSHIP, L.P.

TABLE OF CONTENTS

PART I. FINANCIAL INFORMATION
Item 1.	FINANCIAL STATEMENTS	4
	FINANCIAL STATEMENTS OF SL GREEN REALTY CORP.
	Consolidated Balance Sheets as of September 30, 2017 (unaudited) and December 31, 2016	4
	Consolidated Statements of Operations for the three and nine months ended September 30, 2017 and 2016 (unaudited)	6
	Consolidated Statements of Comprehensive Income for the three and nine months ended September 30, 2017 and 2016 (unaudited)	8
	Consolidated Statement of Equity for the nine months ended September 30, 2017 (unaudited)	9
	Consolidated Statements of Cash Flows for the nine months ended September 30, 2017 and 2016 (unaudited)	10
	FINANCIAL STATEMENTS OF SL GREEN OPERATING PARTNERSHIP, L.P.
	Consolidated Balance Sheets as of September 30, 2017 (unaudited) and December 31, 2016	12
	Consolidated Statements of Operations for the three and nine months ended September 30, 2017 and 2016 (unaudited)	14
	Consolidated Statements of Comprehensive Income for the three and nine months ended September 30, 2017 and 2016 (unaudited)	16
	Consolidated Statement of Capital for the nine months ended September 30, 2017 (unaudited)	17
	Consolidated Statements of Cash Flows for nine months ended September 30, 2017 and 2016 (unaudited)	18
	Notes to Consolidated Financial Statements (unaudited)	20
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	53
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	73
Item 4.	Controls and Procedures (SL Green Realty Corp. and SL Green Operating Partnership, L.P.)	74
PART II.	OTHER INFORMATION
Item 1.	Legal Proceedings	75
Item 1A.	Risk Factors	75
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	75
Item 3.	Defaults Upon Senior Securities	75
Item 4.	Mine Safety Disclosures	76
Item 5.	Other Information	77
Item 6.	Exhibits	78
	Signatures	79

PART I FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

SL Green Realty Corp.

Consolidated Balance Sheets

(in thousands, except per share data)

	September 30, 2017			December 31, 2016
	(unaudited)
Assets
Commercial real estate properties, at cost:
Land and land interests	$	2,917,993		$	3,309,710
Building and improvements	7,468,436			7,948,852
Building leasehold and improvements	1,444,698			1,437,325
Properties under capital lease	47,445			47,445
	11,878,572			12,743,332
Less: accumulated depreciation	(2,457,071		)	(2,264,694		)
	9,421,501			10,478,638
Assets held for sale	127,663			—
Cash and cash equivalents	241,489			279,443
Restricted cash	107,763			90,524
Investments in marketable securities	28,802			85,110
Tenant and other receivables, net of allowance of $18,365 and $16,592 in 2017 and 2016, respectively	54,663			53,772
Related party receivables	24,068			15,856
Deferred rents receivable, net of allowance of $21,257 and $25,203 in 2017 and 2016, respectively	393,793			442,179
Debt and preferred equity investments, net of discounts and deferred origination fees of $24,782 and $16,705 in 2017 and 2016, respectively	2,020,739			1,640,412
Investments in unconsolidated joint ventures	2,045,796			1,890,186
Deferred costs, net	247,981			267,600
Other assets	395,612			614,067
Total assets (1)	$	15,109,870		$	15,857,787
Liabilities
Mortgages and other loans payable, net	$	3,804,174		$	4,073,830
Revolving credit facility, net	275,832			—
Unsecured term loan, net	1,180,506			1,179,521
Unsecured notes, net	1,064,544			1,128,315
Accrued interest payable	34,367			36,052
Other liabilities	95,718			206,238
Accounts payable and accrued expenses	144,767			190,583
Deferred revenue	252,779			217,955
Capital lease obligations	42,660			42,132
Deferred land leases payable	3,075			2,583
Dividend and distributions payable	85,007			87,271
Security deposits	68,465			66,504
Liabilities related to assets held for sale	1,141			—
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities	100,000			100,000
Total liabilities (1)	7,153,035			7,330,984

4

SL Green Realty Corp.

Consolidated Balance Sheets

(in thousands, except per share data)

	September 30, 2017			December 31, 2016
	(unaudited)
Commitments and contingencies	—			—
Noncontrolling interests in Operating Partnership	470,898			473,882
Preferred units	301,885			302,010
Equity
SL Green stockholders' equity:
Series I Preferred Stock, $0.01 par value, $25.00 liquidation preference, 9,200 issued and outstanding at both September 30, 2017 and December 31, 2016	221,932			221,932
Common stock, $0.01 par value, 160,000 shares authorized and 98,501 and 101,617 issued and outstanding at September 30, 2017 and December 31, 2016, respectively (including 1,055 shares held in treasury at September 30, 2017 and December 31, 2016)	985			1,017
Additional paid-in-capital	5,294,500			5,624,545
Treasury stock at cost	(124,049		)	(124,049		)
Accumulated other comprehensive income	14,185			22,137
Retained earnings	1,410,332			1,578,893
Total SL Green stockholders' equity	6,817,885			7,324,475
Noncontrolling interests in other partnerships	366,167			426,436
Total equity	7,184,052			7,750,911
Total liabilities and equity	$	15,109,870		$	15,857,787
1) The Company's consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs"). See Note 2. The consolidated balance sheets include the following amounts related to our consolidated VIEs, excluding the Operating Partnership: $384.3 million and $412.3 million of land, $1.4 billion and $1.5 billion of building and improvements, $2.0 million and $2.0 million of building and leasehold improvements, $47.4 million and $47.4 million of properties under capital lease, $323.3 million and $327.2 million of accumulated depreciation, $235.4 million and $244.2 million of other assets included in other line items, $627.8 million and $621.8 million of real estate debt, net, $2.5 million and $2.2 million of accrued interest payable, $42.7 million and $42.1 million of capital lease obligations, and $58.5 million and $73.3 million of other liabilities included in other line items as of September 30, 2017 and December 31, 2016, respectively.

The accompanying notes are an integral part of these consolidated financial statements.

5

SL Green Realty Corp.

Consolidated Statements of Operations

(unaudited, in thousands, except per share data)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			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	—			397			(3,256		)	210,750
Depreciable real estate reserves	—			—			(85,336		)	(10,387		)
Gain (loss) on sale of investment in marketable securities	—			—			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 attributable to SL Green	42,607			37,990			69,655			202,143
Perpetual preferred stock dividends	(3,738		)	(3,738		)	(11,213		)	(11,213		)
Net income attributable to SL Green common stockholders	$	38,869		$	34,252		$	58,442		$	190,930

6

SL Green Realty Corp.

Consolidated Statements of Operations

(unaudited, in thousands, except per share data)

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017			2016
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	—		380		(3,113		)	202,128
Depreciable real estate reserves	—		—		(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	$	0.39	$	0.34	$	1.28		$	(0.43	)
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	0.01		—		0.16			0.42
Gain (loss) on sale of real estate, net	—		—		(0.03		)	2.02
Depreciable real estate reserves	—		—		(0.82		)	(0.10		)
Net income attributable to SL Green common stockholders	$	0.40	$	0.34	$	0.59		$	1.91
Diluted earnings per share:
Income (loss) before depreciable real estate reserves and gains (losses) on sale	$	0.39	$	0.34	$	1.28		$	(0.43	)
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	0.01		—		0.16			0.42
Gain (loss) on sale of real estate, net	—		—		(0.03		)	2.01
Depreciable real estate reserves	—		—		(0.82		)	(0.10		)
Net income attributable to SL Green common stockholders	$	0.40	$	0.34	$	0.59		$	1.90
Dividends per share	$	0.775	$	0.72	$	2.325		$	2.16
Basic weighted average common shares outstanding	97,783		100,233		99,431			100,140
Diluted weighted average common shares and common share equivalents outstanding	102,570		105,143		104,280			104,761

The accompanying notes are an integral part of these consolidated financial statements.

7

SL Green Realty Corp.

Consolidated Statements of Comprehensive Income

(unaudited, in thousands)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Net income	$	45,795		$	43,343		$	62,734		$	224,941
Other comprehensive loss:
Change in net unrealized gain on derivative instruments, including SL Green's share of joint venture net unrealized gain on derivative instruments	(217		)	2,632			(3,812		)	(4,682		)
Change in unrealized gain on marketable securities	44			(30		)	(4,443		)	(900		)
Other comprehensive (loss) income	(173		)	2,602			(8,255		)	(5,582		)
Comprehensive income	45,622			45,945			54,479			219,359
Net (income) loss attributable to noncontrolling interests and preferred units distributions	(3,188		)	(5,353		)	6,921			(22,798		)
Other comprehensive loss attributable to noncontrolling interests	4			(118		)	303			257
Comprehensive income attributable to SL Green	$	42,438		$	40,474		$	61,703		$	196,818

The accompanying notes are an integral part of these consolidated financial statements.

8

SL Green Realty Corp.

Consolidated Statement of Equity

(unaudited, in thousands, except per share data)

	SL Green Realty Corp. Stockholders
				Common Stock
		Series I Preferred Stock		Shares		Par Value			Additional Paid- In-Capital			Treasury Stock			Accumulated Other Comprehensive Income (Loss)			Retained Earnings			Noncontrolling Interests			Total
Balance at December 31, 2016		$	221,932	100,562		$	1,017		$	5,624,545		$	(124,049	)	$	22,137		$	1,578,893		$	426,436		$	7,750,911
Net income (loss)																		69,655			(18,179		)	51,476
Other comprehensive loss															(7,952		)							(7,952		)
Preferred dividends																		(11,213		)				(11,213		)
DRSPP proceeds				2					185															185
Conversion of units of the Operating Partnership to common stock				142		1			15,352															15,353
Reallocation of noncontrolling interest in the Operating Partnership																		2,669						2,669
Equity component of repurchased exchangeable senior notes									(27,969		)													(27,969		)
Deferred compensation plan and stock awards, net				(6	)				(1,959		)													(1,959		)
Amortization of deferred compensation plan									22,014															22,014
Repurchases of common stock				(3,400	)	(34		)	(349,957		)													(349,991		)
Proceeds from stock options exercised				146		1			12,289															12,290
Contributions to consolidated joint venture interests																					33,202			33,202
Deconsolidation of partially owned entity																					(30,203		)	(30,203		)
Cash distributions to noncontrolling interests																					(45,089		)	(45,089		)
Cash distributions declared ($2.325 per common share, none of which represented a return of capital for federal income tax purposes)																		(229,672		)				(229,672		)
Balance at September 30, 2017		$	221,932	97,446		$	985		$	5,294,500		$	(124,049	)	$	14,185		$	1,410,332		$	366,167		$	7,184,052

The accompanying notes are an integral part of these consolidated financial statements.

9

SL Green Realty Corp.

Consolidated Statements of Cash Flows

(unaudited, in thousands, except per share data)

	Nine Months Ended September 30,
	2017			2016
Operating Activities
Net income	$	62,734		$	224,941
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	331,117			737,195
Equity in net income from unconsolidated joint ventures	(14,104		)	(11,969		)
Distributions of cumulative earnings from unconsolidated joint ventures	19,609			19,311
Equity in net gain on sale of interest in unconsolidated joint venture interest/real estate	(16,166		)	(43,588		)
Depreciable real estate reserves	85,336			10,387
Loss (gain) on sale of real estate, net	3,256			(210,750		)
(Gain) loss on sale of investments in marketable securities	(3,262		)	83
Deferred rents receivable	(33,523		)	40,056
Other non-cash adjustments (1)	18,423			(155,558		)
Changes in operating assets and liabilities:
Restricted cash—operations	6,520			(12,855		)
Tenant and other receivables	(2,318		)	2,714
Related party receivables	(8,238		)	(4,167		)
Deferred lease costs	(31,479		)	(47,036		)
Other assets	(58,068		)	(30,899		)
Accounts payable, accrued expenses, other liabilities and security deposits	1,423			(28,089		)
Deferred revenue and land leases payable	55,361			19,016
Net cash provided by operating activities	416,621			508,792
Investing Activities
Acquisitions of real estate property	(25,114		)	(38,005		)
Additions to land, buildings and improvements	(251,158		)	(269,182		)
Escrowed cash—capital improvements/acquisition deposits/deferred purchase price	17,431			85,983
Investments in unconsolidated joint ventures	(112,697		)	(69,422		)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	279,478			171,472
Net proceeds from disposition of real estate/joint venture interest	116,983			2,419,841
Proceeds from sale or redemption of marketable securities	55,129			6,868
Purchases of marketable securities	—			(23,062		)
Other investments	46,955			8,232
Origination of debt and preferred equity investments	(935,724		)	(554,803		)
Repayments or redemption of debt and preferred equity investments	707,676			667,251
Net cash (used in) provided by investing activities	(101,041		)	2,405,173

10

SL Green Realty Corp.

Consolidated Statements of Cash Flows

(unaudited, in thousands, except per share data)

	Nine Months Ended September 30,
	2017			2016
Financing Activities
Proceeds from mortgages and other loans payable	$	779,650		$	256,207
Repayments of mortgages and other loans payable	(706,056		)	(1,786,034		)
Proceeds from revolving credit facility and senior unsecured notes	1,447,800			1,260,300
Repayments of revolving credit facility and senior unsecured notes	(1,270,804		)	(2,269,604		)
Proceeds from stock options exercised and DRIP issuance	12,475			12,404
Repurchase of common stock	(349,991		)	—
Redemption of preferred stock	(125		)	(2,999		)
Distributions to noncontrolling interests in other partnerships	(45,089		)	(11,023		)
Contributions from noncontrolling interests in other partnerships	33,202			2,019
Distributions to noncontrolling interests in the Operating Partnership	(10,639		)	(9,245		)
Dividends paid on common and preferred stock	(251,701		)	(234,801		)
Other obligations related to loan participations	16,737			59,150
Deferred loan costs and capitalized lease obligation	(8,993		)	(39,842		)
Net cash used in financing activities	(353,534		)	(2,763,468		)
Net (decrease) increase in cash and cash equivalents	(37,954		)	150,497
Cash and cash equivalents at beginning of year	279,443			255,399
Cash and cash equivalents at end of period	$	241,489		$	405,896
(1) Included in Other non-cash adjustments is $172.4 million for the nine months ended September 30, 2016 for the amortization of the below-market lease at 388-390 Greenwich Street as a result of the tenant exercising their option to purchase the property and entering into an agreement to accelerate the sale.
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Issuance of units in the Operating Partnership	$	23,273		$	51,647
Redemption of units in the Operating Partnership for stock	15,352			12,746
Derivative instruments at fair value	7,362			—
Exchange of debt investment for equity in joint venture	—			68,581
Issuance of preferred units relating to a real estate acquisition	—			22,793
Tenant improvements and capital expenditures payable	8,926			4,281
Fair value adjustment to noncontrolling interest in Operating Partnership	2,669			4,959
Deconsolidation of subsidiaries	328,643			1,173,570
Transfer of assets related to assets held for sale	273,455			2,048,376
Transfer of liabilities related to assets held for sale	1,290			1,677,528
Deferred leasing payable	810			1,208
Removal of fully depreciated commercial real estate properties	11,158			22,179
Issuance of SLG's common stock to consolidated joint venture	—			114,049

The accompanying notes are an integral part of these consolidated financial statements.

11

SL Green Operating Partnership, L.P.

Consolidated Balance Sheets

(in thousands, except per unit data)

	September 30, 2017			December 31, 2016
	(unaudited)
Assets
Commercial real estate properties, at cost:
Land and land interests	$	2,917,993		$	3,309,710
Building and improvements	7,468,436			7,948,852
Building leasehold and improvements	1,444,698			1,437,325
Properties under capital lease	47,445			47,445
	11,878,572			12,743,332
Less: accumulated depreciation	(2,457,071		)	(2,264,694		)
	9,421,501			10,478,638
Assets held for sale	127,663			—
Cash and cash equivalents	241,489			279,443
Restricted cash	107,763			90,524
Investments in marketable securities	28,802			85,110
Tenant and other receivables, net of allowance of $18,365 and $16,592 in 2017 and 2016, respectively	54,663			53,772
Related party receivables	24,068			15,856
Deferred rents receivable, net of allowance of $21,257 and $25,203 in 2017 and 2016, respectively	393,793			442,179
Debt and preferred equity investments, net of discounts and deferred origination fees of $24,782 and $16,705 in 2017 and 2016, respectively	2,020,739			1,640,412
Investments in unconsolidated joint ventures	2,045,796			1,890,186
Deferred costs, net	247,981			267,600
Other assets	395,612			614,067
Total assets (1)	$	15,109,870		$	15,857,787
Liabilities
Mortgages and other loans payable, net	$	3,804,174		$	4,073,830
Revolving credit facility, net	275,832			—
Unsecured term loan, net	1,180,506			1,179,521
Unsecured notes, net	1,064,544			1,128,315
Accrued interest payable	34,367			36,052
Other liabilities	95,718			206,238
Accounts payable and accrued expenses	144,767			190,583
Deferred revenue	252,779			217,955
Capital lease obligations	42,660			42,132
Deferred land leases payable	3,075			2,583
Dividend and distributions payable	85,007			87,271
Security deposits	68,465			66,504
Liabilities related to assets held for sale	1,141			—
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities	100,000			100,000
Total liabilities (1)	7,153,035			7,330,984
Commitments and contingencies	—			—
Limited partner interests in SLGOP (4,542 and 4,364 limited partner common units outstanding at September 30, 2017 and December 31, 2016, respectively)	470,898			473,882
Preferred units	301,885			302,010

12

SL Green Operating Partnership, L.P.

Consolidated Balance Sheets

(in thousands, except per unit data)

	September 30, 2017		December 31, 2016
	(unaudited)
Capital
SLGOP partners' capital:
Series I Preferred Units, $25.00 liquidation preference, 9,200 issued and outstanding at both September 30, 2017 and December 31, 2016	221,932		221,932
SL Green partners' capital (1,020 and 1,049 general partner common units and 96,426 and 99,513 limited partner common units outstanding at September 30, 2017 and December 31, 2016, respectively)	6,581,768		7,080,406
Accumulated other comprehensive income	14,185		22,137
Total SLGOP partners' capital	6,817,885		7,324,475
Noncontrolling interests in other partnerships	366,167		426,436
Total capital	7,184,052		7,750,911
Total liabilities and capital	$	15,109,870	$	15,857,787
1) The Operating Partnership's consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs"). See Note 2. The consolidated balance sheets include the following amounts related to our consolidated VIEs: $384.3 million and $412.3 million of land, $1.4 billion and $1.5 billion of building and improvements, $2.0 million and $2.0 million of building and leasehold improvements, $47.4 million and $47.4 million of properties under capital lease, $323.3 million and $327.2 million of accumulated depreciation, $235.4 million and $244.2 million of other assets included in other line items, $627.8 million and $621.8 million of real estate debt, net, $2.5 million and $2.2 million of accrued interest payable, $42.7 million and $42.1 million of capital lease obligations, and $58.5 million and $73.3 million of other liabilities included in other line items as of September 30, 2017 and December 31, 2016, respectively.

The accompanying notes are an integral part of these consolidated financial statements.

13

SL Green Operating Partnership, L.P.

Consolidated Statements of Operations

(unaudited, in thousands, except per unit data)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			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	—			397			(3,256		)	210,750
Depreciable real estate reserves	—			—			(85,336		)	(10,387		)
Gain (loss) on sale of investment in marketable securities	—			—			3,262			(83		)
Net income	45,795			43,343			62,734			224,941
Net loss (income) attributable to noncontrolling interests:
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 attributable to 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

14

SL Green Operating Partnership, L.P.

Consolidated Statements of Operations

(unaudited, in thousands, except per unit data)

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017			2016
Amounts attributable to SLGOP common unitholders:
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	—		397		(3,256		)	210,750
Depreciable real estate reserves	—		—		(85,336		)	(10,387		)
Net income attributable toSLGOP common unitholders	$	40,681	$	35,915	$	61,149		$	199,101
Basic earnings per unit:
Income (loss) before depreciable real estate reserves and gains (losses) on sale	$	0.39	$	0.34	$	1.28		$	(0.43	)
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	0.01		—		0.16			0.42
Gain (loss) on sale of real estate, net	—		—		(0.03		)	2.02
Depreciable real estate reserves	—		—		(0.82		)	(0.10		)
Net income attributable to SLGOP common unitholders	$	0.40	$	0.34	$	0.59		$	1.91
Diluted earnings per unit:
Income (loss) before depreciable real estate reserves and gains (losses) on sale	$	0.39	$	0.34	$	1.28		$	(0.43	)
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	0.01		—		0.16			0.42
Gain (loss) on sale of real estate, net	—		—		(0.03		)	2.01
Depreciable real estate reserves	—		—		(0.82		)	(0.10		)
Net income attributable to SLGOP common unitholders	$	0.40	$	0.34	$	0.59		$	1.90
Dividends per unit	$	0.775	$	0.72	$	2.325		$	2.16
Basic weighted average common units outstanding	102,326		104,730		104,001			104,412
Diluted weighted average common units and common unit equivalents outstanding	102,570		105,143		104,280			104,761

The accompanying notes are an integral part of these consolidated financial statements.

15

SL Green Operating Partnership, L.P.

Consolidated Statements of Comprehensive Income

(unaudited, in thousands)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Net income	$	45,795		$	43,343		$	62,734		$	224,941
Other comprehensive loss:
Change in net unrealized gain on derivative instruments, including SLGOP's share of joint venture net unrealized gain on derivative instruments	(217		)	2,632			(3,812		)	(4,682		)
Change in unrealized gain on marketable securities	44			(30		)	(4,443		)	(900		)
Other comprehensive loss	(173		)	2,602			(8,255		)	(5,582		)
Comprehensive (loss) income	45,622			45,945			54,479			219,359
Net loss (income) attributable to noncontrolling interests	1,474			(836		)	18,179			(6,245		)
Other comprehensive loss attributable to noncontrolling interests	4			(118		)	303			257
Comprehensive income attributable to SLGOP	$	47,100		$	44,991		$	72,961		$	213,371

The accompanying notes are an integral part of these consolidated financial statements.

16

SL Green Operating Partnership, L.P.

Consolidated Statement of Capital

(unaudited, in thousands, except per unit data)

	SL Green Operating Partnership Unitholders
			Partners' Interest
	Series I Preferred Units		Common Units		Common Unitholders			Accumulated Other Comprehensive Income (Loss)			Noncontrolling Interests			Total
Balance at December 31, 2016	$	221,932	100,562		$	7,080,406		$	22,137		$	426,436		$	7,750,911
Net income (loss)					69,655						(18,179		)	51,476
Other comprehensive loss								(7,952		)				(7,952		)
Preferred distributions					(11,213		)							(11,213		)
DRSPP proceeds			2		185									185
Conversion of common units			142		15,353									15,353
Reallocation of noncontrolling interests in the operating partnership					2,669									2,669
Equity component of repurchased exchangeable senior notes					(27,969		)							(27,969		)
Deferred compensation plan and stock awards, net			(6	)	(1,959		)							(1,959		)
Amortization of deferred compensation plan					22,014									22,014
Repurchases of common stock			(3,400	)	(349,991		)							(349,991		)
Contribution to consolidated joint venture interests											33,202			33,202
Deconsolidation of partially owned entity											(30,203		)	(30,203		)
Contributions - proceeds from stock options exercised			146		12,290									12,290
Cash distributions to noncontrolling interests											(45,089		)	(45,089		)
Cash distributions declared ($2.325 per common unit, none of which represented a return of capital for federal income tax purposes)					(229,672		)							(229,672		)
Balance at September 30, 2017	$	221,932	97,446		$	6,581,768		$	14,185		$	366,167		$	7,184,052

The accompanying notes are an integral part of these consolidated financial statements.

17

SL Green Operating Partnership, L.P.

Consolidated Statements of Cash Flows

(unaudited, in thousands)

	Nine Months Ended September 30,
	2017			2016
Operating Activities
Net income	$	62,734		$	224,941
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	331,117			737,195
Equity in net income from unconsolidated joint ventures	(14,104		)	(11,969		)
Distributions of cumulative earnings from unconsolidated joint ventures	19,609			19,311
Equity in net gain on sale of interest in unconsolidated joint venture interest/real estate	(16,166		)	(43,588		)
Depreciable real estate reserves	85,336			10,387
Loss (gain) on sale of real estate, net	3,256			(210,750		)
(Gain) loss on sale of investments in marketable securities	(3,262		)	83
Deferred rents receivable	(33,523		)	40,056
Other non-cash adjustments (1)	18,423			(155,558		)
Changes in operating assets and liabilities:
Restricted cash—operations	6,520			(12,855		)
Tenant and other receivables	(2,318		)	2,714
Related party receivables	(8,238		)	(4,167		)
Deferred lease costs	(31,479		)	(47,036		)
Other assets	(58,068		)	(30,899		)
Accounts payable, accrued expenses, other liabilities and security deposits	1,423			(28,089		)
Deferred revenue and land leases payable	55,361			19,016
Net cash provided by operating activities	416,621			508,792
Investing Activities
Acquisitions of real estate property	(25,114		)	(38,005		)
Additions to land, buildings and improvements	(251,158		)	(269,182		)
Escrowed cash—capital improvements/acquisition deposits/deferred purchase price	17,431			85,983
Investments in unconsolidated joint ventures	(112,697		)	(69,422		)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	279,478			171,472
Net proceeds from disposition of real estate/joint venture interest	116,983			2,419,841
Proceeds from sale or redemption of marketable securities	55,129			6,868
Purchases of marketable securities	—			(23,062		)
Other investments	46,955			8,232
Origination of debt and preferred equity investments	(935,724		)	(554,803		)
Repayments or redemption of debt and preferred equity investments	707,676			667,251
Net cash (used in) provided by investing activities	(101,041		)	2,405,173

18

SL Green Operating Partnership, L.P.

Consolidated Statements of Cash Flows

(unaudited, in thousands)

	Nine Months Ended September 30,
	2017			2016
Financing Activities
Proceeds from mortgages and other loans payable	$	779,650		$	256,207
Repayments of mortgages and other loans payable	(706,056		)	(1,786,034		)
Proceeds from revolving credit facility and senior unsecured notes	1,447,800			1,260,300
Repayments of revolving credit facility and senior unsecured notes	(1,270,804		)	(2,269,604		)
Proceeds from stock options exercised and DRIP issuance	12,475			12,404
Repurchase of common stock	(349,991		)	—
Redemption of preferred stock	(125		)	(2,999		)
Distributions to noncontrolling interests in other partnerships	(45,089		)	(11,023		)
Contributions from noncontrolling interests in other partnerships	33,202			2,019
Distributions paid on common and preferred units	(262,340		)	(244,046		)
Other obligations related to loan participations	16,737			59,150
Deferred loan costs and capitalized lease obligation	(8,993		)	(39,842		)
Net cash used in financing activities	(353,534		)	(2,763,468		)
Net (decrease) increase in cash and cash equivalents	(37,954		)	150,497
Cash and cash equivalents at beginning of year	279,443			255,399
Cash and cash equivalents at end of period	$	241,489		$	405,896
(1) Included in Other non-cash adjustments is $172.4 million for the nine months ended September 30, 2016 for the amortization of the below-market lease at 388-390 Greenwich Street as a result of the tenant exercising their option to purchase the property and entering into an agreement to accelerate the sale.
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Issuance of units in the Operating Partnership	$	23,273		$	51,647
Redemption of units in the Operating Partnership for stock	15,352			12,746
Derivative instruments at fair value	7,362			—
Exchange of debt investment for equity in joint venture	—			68,581
Issuance of preferred units relating to a real estate acquisition	—			22,793
Tenant improvements and capital expenditures payable	8,926			4,281
Fair value adjustment to noncontrolling interest in Operating Partnership	2,669			4,959
Deconsolidation of subsidiaries	328,643			1,173,570
Transfer of assets related to assets held for sale	273,455			2,048,376
Transfer of liabilities related to assets held for sale	1,290			1,677,528
Deferred leasing payable	810			1,208
Removal of fully depreciated commercial real estate properties	11,158			22,179

The accompanying notes are an integral part of these consolidated financial statements.

19

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements

September 30, 2017

(unaudited)

1. Organization and Basis of Presentation

SL Green Realty Corp., which is referred to as the Company or SL Green, a Maryland corporation, and SL Green Operating Partnership, L.P., which is referred to as SLGOP or the Operating Partnership, a Delaware limited partnership, were formed in June 1997 for the purpose of combining the commercial real estate business of S.L. Green Properties, Inc. and its affiliated partnerships and entities. The Operating Partnership received a contribution of interest in the real estate properties, as well as 95% of the economic interest in the management, leasing and construction companies which are referred to as the Service Corporation. All of the management, leasing and construction services that are provided to the properties that are wholly-owned by us and that are provided to certain joint ventures are conducted through SL Green Management LLC which is 100% owned by the Operating Partnership. The Company has qualified, and expects to qualify in the current fiscal year, as a real estate investment trust, or REIT, under the Internal Revenue Code of 1986, as amended, or the Code, and operates as a self-administered, self-managed REIT. A REIT is a legal entity that holds real estate interests and, through payments of dividends to stockholders, is permitted to minimize the payment of Federal income taxes at the corporate level. Unless the context requires otherwise, all references to "we," "our" and "us" means the Company and all entities owned or controlled by the Company, including the Operating Partnership.

Substantially all of our assets are held by, and all of our operations are conducted through, the Operating Partnership. The Company is the sole managing general partner of the Operating Partnership. As of September 30, 2017, noncontrolling investors held, in the aggregate, a 4.45% limited partnership interest in the Operating Partnership. We refer to these interests as the noncontrolling interests in the Operating Partnership. The Operating Partnership is considered a variable interest entity, or VIE, in which we are the primary beneficiary. See Note 11, "Noncontrolling Interests on the Company's Consolidated Financial Statements".

Reckson Associates Realty Corp., or Reckson, and Reckson Operating Partnership, L.P., or ROP, are wholly-owned subsidiaries of SL Green Realty Corp.

As of September 30, 2017, we owned the following interests in properties in the New York Metropolitan area, primarily in midtown Manhattan. Our investments in the New York Metropolitan area also include investments in Brooklyn, Long Island, Westchester County, Connecticut and New Jersey, which are collectively known as the Suburban properties:

		Consolidated			Unconsolidated		Total
Location	Property Type	Number of Properties		Approximate Square Feet (unaudited)	Number of Properties	Approximate Square Feet (unaudited)	Number of Properties	Approximate Square Feet (unaudited)	Weighted Average Occupancy(1) (unaudited)
Commercial:
Manhattan	Office	24		16,054,606	7	6,558,139	31	22,612,745	93.4	%
	Retail	4	(2)	302,583	9	347,970	13	650,553	94.5	%
	Development/Redevelopment	7		158,985	4	770,514	11	929,499	59.9	%
	Fee Interest	1		176,530	1	—	2	176,530	100.0	%
		36		16,692,704	21	7,676,623	57	24,369,327	92.2	%
Suburban	Office	22	(3)(4)	3,608,800	2	640,000	24	4,248,800	83.1	%
	Retail	1		52,000	—	—	1	52,000	100.0	%
	Development/Redevelopment	1		1,000	1	—	2	1,000	100.0	%
		24		3,661,800	3	640,000	27	4,301,800	83.3	%
Total commercial properties		60		20,354,504	24	8,316,623	84	28,671,127	90.8	%
Residential:
Manhattan	Residential	3	(2)	472,105	12	2,656,856	15	3,128,961	86.4	%
Suburban	Residential	—		—	—	—	—	—	—	%
Total residential properties		3		472,105	12	2,656,856	15	3,128,961	86.4	%
Total portfolio(2)(3)		63		20,826,609	36	10,973,479	99	31,800,088	90.4	%

(1) The weighted average occupancy for commercial properties represents the total occupied square feet divided by total square footage at acquisition. The weighted average occupancy for residential properties represents the total occupied units divided by total available units.

20

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

(2) As of September 30, 2017, we owned a building at 315 West 33rd Street, also known as The Olivia, that was comprised of approximately 270,132 square feet (unaudited) of retail space and approximately 222,855 square feet (unaudited) of residential space. For the purpose of this report, we have included this building in the number of retail properties we own. However, we have included only the retail square footage in the retail approximate square footage, and have listed the balance of the square footage as residential square footage.

(3) Includes the properties at 16 Court Street in Brooklyn, New York, and 125 Chubb Avenue in Lyndhurst, New Jersey which are classified as held for sale at September 30, 2017. The sales closed in October 2017.

As of September 30, 2017, we also managed an approximately 336,000 square foot (unaudited) office building owned by a third party and held debt and preferred equity investments with a book value of $2.2 billion, including $0.1 billion of debt and preferred equity investments and other financing receivables that are included in other balance sheet line items other than the Debt and Preferred Equity Investments line item.

Partnership Agreement

In accordance with the partnership agreement of the Operating Partnership, or the Operating Partnership Agreement, we allocate all distributions and profits and losses in proportion to the percentage of ownership interests of the respective partners. As the managing general partner of the Operating Partnership, we are required to take such reasonable efforts, as determined by us in our sole discretion, to cause the Operating Partnership to distribute sufficient amounts to enable the payment of sufficient dividends by us to minimize any Federal income or excise tax at the Company level. Under the Operating Partnership Agreement, each limited partner has the right to redeem units of limited partnership interests for cash, or if we so elect, shares of SL Green's common stock on a one-for-one basis.

Basis of Quarterly Presentation

The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by accounting principles generally accepted in the United States for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for the fair presentation of the financial position of the Company and the Operating Partnership at September 30, 2017 and the results of operations for the periods presented have been included. The operating results for the period presented are not necessarily indicative of the results that may be expected for the year ending December 31, 2017. These financial statements should be read in conjunction with the financial statements and accompanying notes included in the Annual Report on Form 10-K for the year ended December 31, 2016 of the Company and the Operating Partnership.

The consolidated balance sheet at December 31, 2016 has been derived from the audited financial statements as of that date but do not include all the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

2. Significant Accounting Policies

Principles of Consolidation

The consolidated financial statements include our accounts and those of our subsidiaries, which are wholly-owned or controlled by us. Entities which we do not control through our voting interest and entities which are variable interest entities, but where we are not the primary beneficiary, are accounted for under the equity method. See Note 5, "Debt and Preferred Equity Investments" and Note 6, "Investments in Unconsolidated Joint Ventures." All significant intercompany balances and transactions have been eliminated.

We consolidate a variable interest entity, or VIE, in which we are considered the primary beneficiary. The primary beneficiary is the entity that has (i) the power to direct the activities that most significantly impact the entity's economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE.

Investment in Commercial Real Estate Properties

On a periodic basis, we assess whether there are any indications that the value of our real estate properties may be other than temporarily impaired or that their carrying value may not be recoverable. A property's value is considered impaired if management's estimate of the aggregate future cash flows (undiscounted) to be generated by the property is less than the carrying value of the property. To the extent impairment has occurred, the loss will be measured as the excess of the carrying amount of the property over the calculated fair value of the property. We also evaluate our real estate properties for potential impairment when a real estate property has been classified as held for sale. Real estate assets held for sale are valued at the lower of either their carrying value or fair value less costs to sell. We do not believe that there were any indicators of impairment at any of our consolidated properties at September 30, 2017. We recorded no depreciable real estate reserves for the three months ended September 30, 2017, and

21

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

aggregate depreciable real estate reserves of $85.3 million for the nine months ended September 30, 2017. See Note 4, "Property Dispositions".

We allocate the purchase price of real estate to land and building (inclusive of tenant improvements) and, if determined to be material, intangibles, such as the value of above- and below-market leases and origination costs associated with the in-place leases. We depreciate the amount allocated to building (inclusive of tenant improvements) over their estimated useful lives, which generally range from three to 40 years. We amortize the amount allocated to the above- and below-market leases over the remaining term of the associated lease, which generally range from one to 14 years, and record it as either an increase (in the case of below-market leases) or a decrease (in the case of above-market leases) to rental income. We amortize the amount allocated to the values associated with in-place leases over the expected term of the associated lease, which generally ranges from one to 14 years. If a tenant vacates its space prior to the contractual termination of the lease and no rental payments are being made on the lease, any unamortized balance of the related intangible will be written off. The tenant improvements and origination costs are amortized as an expense over the remaining life of the lease (or charged against earnings if the lease is terminated prior to its contractual expiration date). We assess fair value of the leases based on estimated cash flow projections that utilize appropriate discount and capitalization rates and available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known trends, and market/economic conditions that may affect the property. To the extent acquired leases contain fixed rate renewal options that are below-market and determined to be material, we amortize such below-market lease value into rental income over the renewal period.

We recognized $4.6 million and $15.8 million of rental revenue for the three and nine months ended September 30, 2017, and $0.2 million and $191.4 million of rental revenue for the three and nine months ended September 30, 2016 for the amortization of aggregate below-market leases in excess of above-market leases and a reduction in lease origination costs, resulting from the allocation of the purchase price of the applicable properties. Included in rental revenue is zero and $172.4 million for the three and nine months ended September 30, 2016, for the amortization of the below-market lease at 388-390 Greenwich Street as a result of the tenant exercising their option to purchase the property and entering into an agreement to accelerate the sale. For the three and nine months ended September 30, 2017, we recognized as a reduction to interest expense the amortization of above-market rate mortgages of $0.0 million and $0.8 million, respectively. For the three and nine months ended September 30, 2016, we recognized as a reduction to interest expense the amortization of the above-market rate mortgages assumed of $0.7 million and $2.0 million, respectively.

The following summarizes our identified intangible assets (acquired above-market leases and in-place leases) and intangible liabilities (acquired below-market leases) as of September 30, 2017 and December 31, 2016 (in thousands):

	September 30, 2017			December 31, 2016
Identified intangible assets (included in other assets):
Gross amount	$	474,493		$	651,099
Accumulated amortization	(398,047		)	(410,930		)
Net(1)	$	76,446		$	240,169
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	639,511		$	655,930
Accumulated amortization	(474,365		)	(464,749		)
Net(1)	$	165,146		$	191,181

(1) As of September 30, 2017 and December 31, 2016, $3.9 million and none, respectively and $1.1 million and none, respectively, of net intangible assets and net intangible liabilities, were reclassified to assets held for sale and liabilities related to assets held for sale.

Fair Value Measurements

See Note 16, "Fair Value Measurements."

Investment in Marketable Securities

At acquisition, we designate a security as held-to-maturity, available-for-sale, or trading. As of September 30, 2017, we did not have any securities designated as held-to-maturity or trading. We account for our available-for-sale securities at fair value pursuant to Accounting Standards Codification, or ASC, 820-10, with the net unrealized gains or losses reported as a component of accumulated other comprehensive income or loss. Any unrealized losses that are determined to be other-than-temporary are recognized in earnings up to their credit component.

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SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

The cost of bonds and marketable securities sold is determined using the specific identification method.

At September 30, 2017 and December 31, 2016, we held the following marketable securities (in thousands):

	September 30, 2017		December 31, 2016
Equity marketable securities	$	—	$	48,315
Commercial mortgage-backed securities	28,802		36,795
Total marketable securities available-for-sale	$	28,802	$	85,110

The cost basis of the commercial mortgage-backed securities was $27.5 million and $36.0 million at September 30, 2017 and December 31, 2016, respectively. These securities mature at various times through 2049. We held no equity marketable securities as of September 30, 2017. The cost basis of the equity marketable securities was $43.3 million at December 31, 2016.

During the three and nine months ended September 30, 2017, we disposed of marketable securities for aggregate net proceeds of $0.8 million and $55.2 million, respectively. During the three and nine months ended September 30, 2016, we disposed of marketable securities for aggregate net proceeds of $1.7 million and $6.9 million, respectively.

Investments in Unconsolidated Joint Ventures

We assess our investments in unconsolidated joint ventures for recoverability, and if it is determined that a loss in value of the investment is other than temporary, we write down the investment to its fair value. We evaluate our equity investments for impairment based on the joint ventures' projected discounted cash flows. We do not believe that the values of any of our equity investments were impaired at September 30, 2017.

Reserve for Possible Credit Losses

The expense for possible credit losses in connection with debt and preferred equity investments is the charge to earnings to increase the allowance for possible credit losses to the level that we estimate to be adequate, based on Level 3 data, considering delinquencies, loss experience and collateral quality. Other factors considered include geographic trends, product diversification, the size of the portfolio and current economic conditions. Based upon these factors, we establish a provision for possible credit loss on each individual investment. When it is probable that we will be unable to collect all amounts contractually due, the investment is considered impaired.

Where impairment is indicated on an investment that is held to maturity, a valuation allowance is measured based upon the excess of the recorded investment amount over the net fair value of the collateral. Any deficiency between the carrying amount of an asset and the calculated value of the collateral is charged to expense. We continue to assess or adjust our estimates based on circumstances of a loan and the underlying collateral. If additional information reflects increased recovery of our investment, we will adjust our reserves accordingly. There were no loan reserves recorded during the three and nine months ended September 30, 2017 and 2016.

Income Taxes

SL Green is taxed as a REIT under Section 856(c) of the Code. As a REIT, SL Green generally is not subject to Federal income tax. To maintain its qualification as a REIT, SL Green must distribute at least 90% of its REIT taxable income to its stockholders and meet certain other requirements. If SL Green fails to qualify as a REIT in any taxable year, SL Green will be subject to Federal income tax on SL Green's taxable income at regular corporate rates. SL Green may also be subject to certain state, local and franchise taxes. Under certain circumstances, Federal income and excise taxes may be due on SL Green's undistributed taxable income.

The Operating Partnership is a partnership and, as a result, all income and losses of the partnership are allocated to the partners for inclusion in their respective income tax returns. The only provision for income taxes included in the consolidated statements of operations relates to the Operating Partnership’s consolidated taxable REIT subsidiaries. The Operating Partnership may also be subject to certain state, local and franchise taxes.

Pursuant to amendments to the Code that became effective January 1, 2001, we have elected, and may elect in the future, to treat certain of our existing or newly created corporate subsidiaries as taxable REIT subsidiaries, or TRSs. In general, TRSs may perform non-customary services for the tenants of the Company, hold assets that we cannot hold directly and generally may engage in any real estate or non-real estate related business. The TRSs generate income, resulting in Federal and state income tax liability for these entities.

23

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

During the three and nine months ended September 30, 2017, we recorded Federal, state and local tax provisions of $0.1 million and $2.8 million, respectively.

We follow a two-step approach for evaluating uncertain tax positions. Recognition (step one) occurs when an enterprise concludes that a tax position, based solely on its technical merits, is more-likely-than-not to be sustained upon examination. Measurement (step two) determines the amount of benefit that is more-likely-than-not to be realized upon settlement. Derecognition of a tax position that was previously recognized would occur when a company subsequently determines that a tax position no longer meets the more-likely-than-not threshold of being sustained. The use of a valuation allowance as a substitute for derecognition of tax positions is prohibited.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

Concentrations of Credit Risk

Financial instruments that potentially subject us to concentrations of credit risk consist primarily of cash investments, debt and preferred equity investments and accounts receivable. We place our cash investments with high quality financial institutions. The collateral securing our debt and preferred equity investments is located in New York City. See Note 5, "Debt and Preferred Equity Investments."

We perform ongoing credit evaluations of our tenants and require most tenants to provide security deposits or letters of credit. Though these security deposits and letters of credit are insufficient to meet the total value of a tenant's lease obligation, they are a measure of good faith and a source of funds to offset the economic costs associated with lost revenue and the costs associated with re-tenanting a space. The properties in our real estate portfolio are primarily located in Manhattan. We also have properties located in Brooklyn, Long Island, Westchester County, Connecticut and New Jersey. The tenants located in our buildings operate in various industries. Other than two tenants, Credit Suisse Securities (USA), Inc. and Viacom International, Inc., who account for 8.8% and 6.7% of our share of annualized cash rent, no other tenant in our portfolio accounted for more than 5.0% of our share of annualized cash rent, including our share of joint venture annualized rent, at September 30, 2017. For the three months ended September 30, 2017, 8.9%, 6.3%, 6.2%, and 5.4% of our share of cash rent, including our share of joint venture annualized rent, was attributable to 1515 Broadway, 11 Madison Avenue, 1185 Avenue of the Americas, and 420 Lexington Avenue, respectively. Our share of annualized cash rent for all other properties was below 5.0%.

Reclassification

Certain prior year balances have been reclassified to conform to our current year presentation.

Accounting Standards Updates

In August 2017, the FASB issued Accounting Standards Update (ASU) No. 2017-12, Derivatives and Hedging (Topic 815), Targeted Improvements to Accounting for Hedging Activities. The amendments in the new standard will permit more flexibility in hedging interest rate risk for both variable rate and fixed rate financial instruments. The standard will also enhance the presentation of hedge results in the financial statements. The guidance is effective for fiscal years beginning after December 15, 2018 and early adoption is permitted. The Company has not yet adopted the guidance, and does not expect a material impact on the Company’s consolidated financial statements when the new standard is implemented.

In May 2017, the FASB issued Accounting Standards Update (ASU) No. 2017-09, Compensation - Stock Compensation (Topic 718), Scope of Modification Accounting. The guidance clarifies the changes to the terms or conditions of a share-based payment award that require an entity to apply modification accounting in Topic 718. The guidance is effective for fiscal years beginning after December 15, 2017 and early adoption is permitted. The Company has not yet adopted the guidance.

In February 2017, the FASB issued Accounting Standards Update (ASU) No. 2017-05 to clarify the scope of Subtopic 610-20 as well as provide guidance on accounting for partial sales of nonfinancial assets. Subtopic 610-20 was issued in May 2014 as part of ASU 2014-09. The Company anticipates adopting this guidance January 1, 2018, and applying the modified retrospective approach. The Company is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements.

In January, 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. The guidance clarifies the definition of a business and provides guidance to assist with determining whether transactions should be accounted for as acquisitions of assets or businesses. The main provision is that an acquiree is not a business if substantially

24

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

all of the fair value of the gross assets is concentrated in a single identifiable asset or group of assets. The Company adopted the guidance on the issuance date effective January 5, 2017. The Company expects that most of our real estate acquisitions will be considered asset acquisitions under the new guidance and that transaction costs will be capitalized to the investment basis which is then subject to a purchase price allocation based on relative fair value.

In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. The guidance will require entities to show the changes on the total cash, cash equivalents, restricted cash and restricted cash equivalents in the statement of cash flows. As a result, entities will no longer present transfers between these items on the statement of cash flows. The guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements.

In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. The ASU provides final guidance on eight cash flow issues, including debt prepayment or debt extinguishment costs, contingent consideration payments made after a business combination, distributions received from equity method investees, separately identifiable cash flows and application of the predominance principle, and others. The amendments in the ASU are effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. The Company adopted the guidance effective January 1, 2017 and there was no impact on the Company’s consolidated financial statements.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The guidance changes how entities will measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. The guidance replaces the current ‘incurred loss’ model with an ‘expected loss’ approach. The guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted after December 2018. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements.

In March 2016, the FASB issued ASU No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. The guidance simplifies the accounting for share-based payment award transactions including: income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. The guidance is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted. The Company adopted the guidance effective January 1, 2017 and there was no material impact on the Company’s consolidated financial statements.

In March 2016, the FASB issued ASU 2016-07, Investments Equity Method and Joint Ventures (Topic 323). The guidance eliminates the requirement that an entity retroactively adopt the equity method of accounting if an investment qualifies for use of the equity method as a result of an increase in the level of ownership or degree of influence. The amendments require that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor’s previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. The Company adopted the guidance effective January 1, 2017 and there was no impact on the Company’s consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, Leases. The guidance requires lessees to recognize lease assets and lease liabilities for those leases classified as operating leases under the previous standard. Depending on the lease classification, lessees will recognize expense based on the effective interest method for finance leases or on a straight-line basis for operating leases. The accounting applied by a lessor is largely unchanged from that applied under the previous standard. One of the impacts on the Company will be the presentation and disclosure in the financial statements of non-lease components such as charges to tenants for a building’s operating expenses. The non-lease components will be presented separately from the lease components in both the Consolidated Statements of Operations and Consolidated Balance Sheets. Another impact is the measurement and presentation of ground leases under which the Company is lessee. The Company is required to record a liability for the obligation to make payments under the lease and an asset for the right to use the underlying asset during the lease term and will also apply the new expense recognition requirements given the lease classification. The Company is currently quantifying these impacts. The guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. The Company anticipates adopting this guidance January 1, 2019 and will apply the modified retrospective approach.

In January 2016, the FASB issued ASU 2016-01 (Subtopic 825-10), Recognition and Measurement of Financial Assets and Financial Liabilities. The guidance requires entities to measure equity investments that do not result in consolidation and are not accounted for under the equity method at fair value and to record changes in instruments-specific credit risk for financial liabilities

25

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

measured under the fair value option in other comprehensive income. The guidance is effective for fiscal years beginning after December 15, 2017, and for interim periods therein. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements.

In May 2014, the FASB issued a new comprehensive revenue recognition guidance which requires us to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which we expect to be entitled in exchange for those goods and services (ASU 2014-09). The FASB also issued implementation guidance in March 2016, April 2016 and May 2016 - ASU’s 2016-08, 2016-10 and 2016-12, respectively.

These ASUs are effective for annual and interim periods beginning after December 15, 2017. The Company will adopt this guidance January 1, 2018. Since the Company’s revenue is related to leasing activities, the adoption of this guidance will not have a material impact on the consolidated financial statements. The new guidance is applicable to service contracts with joint ventures for which the Company earns property management fees, leasing commissions and development and construction fees. The adoption of this new guidance does not change the accounting for these fees as the pattern of recognition of revenue does not change with the new guidance. We will continue to recognize revenue over time on these contracts because the customer simultaneously receives and consumes the benefits provided by our performance. Thus, the analysis of our contracts under the new revenue recognition standard is consistent with our current revenue recognition model.

3. Property Acquisitions

During the nine months ended September 30, 2017, we did not acquire any properties from a third party.

4. Properties Held for Sale and Property Dispositions

Properties Held for Sale

During the three months ended September 30, 2017, we entered into an agreement to sell the property at 16 Court Street in Brooklyn, New York, for a gross sales price of $171.0 million.

As of September 30, 2017, 16 Court Street in Brooklyn, New York and 125 Chubb in Lyndhurst, New Jersey were held for sale. We closed on the sale of both properties in October 2017.

Property Dispositions

The following table summarizes the properties sold during the nine months ended September 30, 2017:

Property	Disposition Date	Property Type	Approximate Square Feet	Sales Price(1) (in millions)		Gain (loss)(2) (in millions)
885 Third Avenue (3)	February 2016	Fee Interest	607,000	$	453.0	$	(8.8	)
520 White Plains Road	April 2017	Office	180,000	21.0		(14.6		)
102 Greene Street (4)	April 2017	Retail	9,200	43.5		4.9
680-750 Washington Boulevard	July 2017	Office	325,000	97.0		(44.2		)

(1) Sales price represents the gross sales price for a property or the gross asset valuation for interests in a property.

(2) The gain on sale for 102 Greene Street is net of $0.9 million in employee compensation awards accrued in connection with the realization of the investment gain as a bonus to certain employees that were instrumental in realizing the gain on sale. Additionally, gain on sale amounts do not include adjustments for expenses recorded in subsequent periods.

(3) In February 2016, we closed on the sale of 885 Third Avenue. The sale did not meet the criteria for sale accounting and as a result the property remained on our consolidated financial statements until the criteria was met in April 2017.

(4) In April 2017, we closed on the sale of a 90% interest 102 Greene Street and had subsequently accounted for our interest in the property as an investment in unconsolidated joint ventures. We sold the remaining 10% interest in September 2017. See Note 6, "Investments in Unconsolidated Joint Ventures".

26

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

5. Debt and Preferred Equity Investments

Below is the rollforward analysis of the activity relating to our debt and preferred equity investments as of September 30, 2017 and December 31, 2016 (in thousands):

	September 30, 2017			December 31, 2016
Balance at beginning of period (1)	$	1,640,412		$	1,670,020
Debt Investment Originations/Accretion (2)	944,494			1,009,176
Preferred Equity Investment Originations/Accretion (2)	144,013			5,698
Redemptions/Sales/Syndications/Amortization (3)	(708,180		)	(1,044,482		)
Balance at end of period (1)	$	2,020,739		$	1,640,412

(1) Net of unamortized fees, discounts, and premiums.

(2) Accretion includes amortization of fees and discounts and paid-in-kind investment income.

(3) Certain participations in debt investments that were sold or syndicated did not meet the conditions for sale accounting are included in other assets and other liabilities on the consolidated balance sheets.

Debt Investments

As of September 30, 2017 and December 31, 2016, we held the following debt investments with an aggregate weighted average current yield of 9.49%, excluding our investment in Two Herald Square, at September 30, 2017 (in thousands):

Loan Type	September 30, 2017 Future Funding Obligations		September 30, 2017 Senior Financing		September 30, 2017 Carrying Value (1)		December 31, 2016 Carrying Value (1)		Maturity Date (2)
Fixed Rate Investments:
Mortgage/Jr. Mortgage Loan(3)	$	—	$	—	$	250,164	$	—	April 2017
Mortgage Loan(4)	—		—		26,352		26,311		February 2019
Mortgage Loan	—		—		275		380		August 2019
Mezzanine Loan(5a)	—		1,160,000		201,757		—		March 2020
Mezzanine Loan	—		15,000		3,500		3,500		September 2021
Mezzanine Loan	—		147,000		24,909		—		April 2022
Mezzanine Loan	—		87,595		12,697		12,692		November 2023
Mezzanine Loan(5b)	—		115,000		12,930		12,925		June 2024
Mezzanine Loan	—		95,000		30,000		30,000		January 2025
Mezzanine Loan	—		340,000		15,000		15,000		November 2026
Mezzanine Loan	—		1,657,500		55,250		—		June 2027
Mezzanine Loan(6)	—		—		—		66,129
Jr. Mortgage Participation/Mezzanine Loan (7)	—		—		—		193,422
Total fixed rate	$	—	$	3,617,095	$	632,834	$	360,359
Floating Rate Investments:
Mortgage/Mezzanine Loan(8)	622		—		23,372		20,423		October 2017
Mezzanine Loan(5c)	—		85,000		15,340		15,141		December 2017
Mezzanine Loan(5d)	—		65,000		14,832		14,656		December 2017
Mezzanine Loan(5e)	795		—		15,132		15,051		December 2017
Mortgage/Mezzanine Loan(9)	—		125,000		29,966		29,998		January 2018
Mezzanine Loan	—		40,000		19,964		19,913		April 2018
Jr. Mortgage Participation	—		117,808		34,899		34,844		April 2018
Mezzanine Loan	523		20,523		10,916		10,863		August 2018
Mortgage/Mezzanine Loan	—		—		19,914		19,840		August 2018
Mortgage Loan	—		65,000		14,935		14,880		August 2018

27

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

Loan Type	September 30, 2017 Future Funding Obligations		September 30, 2017 Senior Financing		September 30, 2017 Carrying Value (1)		December 31, 2016 Carrying Value (1)		Maturity Date (2)
Mortgage/Mezzanine Loan(10)	—		—		16,957		16,960		September 2018
Mezzanine Loan	—		37,500		14,801		14,648		September 2018
Mezzanine Loan	2,325		45,025		34,782		34,502		October 2018
Mezzanine Loan	—		335,000		74,683		74,476		November 2018
Mezzanine Loan	—		33,000		26,907		26,850		December 2018
Mezzanine Loan	1,050		171,939		58,598		56,114		December 2018
Mezzanine Loan	8,267		289,621		71,067		63,137		December 2018
Mezzanine Loan	5,197		229,084		74,314		64,505		December 2018
Mezzanine Loan	—		45,000		12,156		12,104		January 2019
Mortgage/Mezzanine Loan (5f)	30,101		—		158,757		—		January 2019
Mezzanine Loan	6,081		24,086		7,812		5,410		January 2019
Mezzanine Loan	—		38,000		21,927		21,891		March 2019
Mezzanine Loan	279		173,700		36,936		—		April 2019
Mezzanine Loan	—		265,000		24,798		24,707		April 2019
Mortgage/Jr. Mortgage Participation Loan	29,661		194,094		69,705		65,554		August 2019
Mezzanine Loan	2,034		187,500		37,835		37,322		September 2019
Mortgage/Mezzanine Loan	49,933		—		130,350		111,819		September 2019
Mortgage/Mezzanine Loan	30,494		—		38,934		33,682		January 2020
Mezzanine Loan(11)	6,794		537,748		72,597		125,911		January 2020
Mezzanine Loan	7,164		33,587		10,988		—		July 2020
Jr. Mortgage Participation/Mezzanine Loan	—		60,000		15,627		15,606		July 2021
Mezzanine Loan	—		280,000		34,124		—		August 2022
Mezzanine Loan(12)	—		—		—		15,369
Mortgage/ Mezzanine Loan(6)	—		—		—		32,847
Mortgage/Mezzanine Loan(6)	—		—		—		22,959
Mezzanine Loan(13)	—		—		—		14,957
Mortgage/Mezzanine Loan(14)	—		—		—		145,239
Total floating rate	$	181,320	$	3,498,215	$	1,243,925	$	1,232,178
Total	$	181,320	$	7,115,310	$	1,876,759	$	1,592,537

(1) Carrying value is net of discounts, premiums, original issue discounts and deferred origination fees.

(2) Represents contractual maturity, excluding any unexercised extension options.

(3) These loans were purchased at par in April and May 2017 and were in maturity default at the time of acquisition. At the time the loans were purchased, the Company expected to collect all contractually required payments, including interest. In August 2017, the Company determined that it was probable that the loans would not be repaid in full and therefore, the loans were put on non-accrual status. No impairment was recorded as the Company believes that the fair value of the property exceeds the carrying amount of the loans. The loans had an outstanding balance including accrued interest of $259.3 million at the time that they were put on non-accrual status.

(4) In September 2014, we acquired a $26.4 million mortgage loan at a $0.2 million discount and a $5.7 million junior mortgage participation at a $5.7 million discount. The junior mortgage participation was a nonperforming loan at acquisition, is currently on non-accrual status and has no carrying value.

(5) Carrying value is net of the following amounts that were sold or syndicated, which are included in other assets and other liabilities on the consolidated balance sheets as a result of the transfers not meeting the conditions for sale accounting: (a) $1.2 million, (b) $12.0 million, (c) $14.6 million, (d) $14.1 million, (e) $5.1 million, and (f) $21.2 million

(6) This loan was repaid in June 2017.

(7) This loan was repaid in March 2017.

(8) This loan was extended in October 2017.

(9) This loan was extended in January 2017.

(10) This loan was extended in September 2017.

(11) $66.1 million of outstanding principal was syndicated in February 2017.

(12) This loan was repaid in September 2017.

(13) This loan was contributed to a joint venture in May 2017.

28

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

(14) This loan was repaid in January 2017.

Preferred Equity Investments

As of September 30, 2017 and December 31, 2016, we held the following preferred equity investments with an aggregate weighted average current yield of 6.98% at September 30, 2017 (in thousands):

Type	September 30, 2017 Future Funding Obligations		September 30, 2017 Senior Financing		September 30, 2017 Carrying Value (1)		December 31, 2016 Carrying Value (1)		Mandatory Redemption (2)
Preferred Equity(3)	$	—	$	272,000	$	143,980	$	—	April 2021
Preferred Equity(4)	—		—		—		9,982
Preferred Equity(5)	—		—		—		37,893
Total	$	—	$	272,000	$	143,980	$	47,875

(1) Carrying value is net of deferred origination fees.

(2) Represents contractual maturity, excluding any unexercised extension options.

(3) In February 2016, we closed on the sale of 885 Third Avenue and retained a preferred equity position in the property. The sale did not meet the criteria for sale accounting under the full accrual method in ASC 360-20, Property, Plant and Equipment - Real Estate Sales. As a result the property remained on our consolidated balance sheet until the criteria was met in April 2017 at which time the property was deconsolidated and the preferred equity investment was recognized.

(4) This investment was redeemed in May 2017.

(5) This investment was redeemed in April 2017.

At September 30, 2017 and December 31, 2016, all debt and preferred equity investments were performing in accordance with the terms of the relevant investments, with the exception of a mortgage and junior mortgage participation purchased in maturity default in May 2017 and April 2017 discussed in subnote 3 of the Debt Investments table above and a junior mortgage participation acquired in September 2014, which was acquired for zero and has a carrying value of zero, as further discussed in subnote 4 of the Debt Investments table above.

We have determined that we have one portfolio segment of financing receivables at September 30, 2017 and 2016 comprising commercial real estate which is primarily recorded in debt and preferred equity investments. Included in other assets is an additional amount of financing receivables totaling $65.6 million and $99.5 million at September 30, 2017 and December 31, 2016, respectively. No financing receivables were 90 days past due at September 30, 2017.

6. Investments in Unconsolidated Joint Ventures

We have investments in several real estate joint ventures with various partners. As of September 30, 2017, 800 Third Avenue, 21 East 66th Street, 605 West 42^nd Street, 333 East 22nd Street, One Vanderbilt, and certain properties within the Stonehenge Portfolio are VIEs in which we are not the primary beneficiary. Our net equity investment in these VIEs was $598.7 million as of September 30, 2017. As of December 31, 2016, 650 Fifth Avenue, 800 Third Avenue, 21 East 66th Street, 605 West 42^nd Street, 333 East 22nd Street, and certain properties within the Stonehenge Portfolio were VIEs in which we were not the primary beneficiary. Our net equity investment in these VIEs was $220.1 million as of December 31, 2016. Our maximum loss is limited to the amount of our equity investment in these VIEs. All other investments below are voting interest entities. As we do not control the joint ventures listed below, we account for them under the equity method of accounting. The table below provides general information on each of our joint ventures as of September 30, 2017:

29

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

Property	Partner	Ownership Interest (1)	Economic Interest (1)	Unaudited Approximate Square Feet	Acquisition Date(2)	Acquisition Price(2) (in thousands)
100 Park Avenue	Prudential Real Estate Investors	49.90%	49.90%	834,000	February 2000	$	95,800
717 Fifth Avenue	Jeff Sutton/Private Investor	10.92%	10.92%	119,500	September 2006	251,900
800 Third Avenue	Private Investors	60.52%	60.52%	526,000	December 2006	285,000
1745 Broadway	Ivanhoe Cambridge, Inc.	56.87%	56.87%	674,000	April 2007	520,000
Jericho Plaza	Onyx Equities/Credit Suisse	11.67%	11.67%	640,000	April 2007	210,000
11 West 34th Street	Private Investor/ Jeff Sutton	30.00%	30.00%	17,150	December 2010	10,800
3 Columbus Circle(3)	The Moinian Group	48.90%	48.90%	741,500	January 2011	500,000
280 Park Avenue	Vornado Realty Trust	50.00%	50.00%	1,219,158	March 2011	400,000
1552-1560 Broadway(4)	Jeff Sutton	50.00%	50.00%	57,718	August 2011	136,550
724 Fifth Avenue	Jeff Sutton	50.00%	50.00%	65,010	January 2012	223,000
10 East 53rd Street	Canadian Pension Plan Investment Board	55.00%	55.00%	354,300	February 2012	252,500
521 Fifth Avenue	Plaza Global Real Estate Partners LP	50.50%	50.50%	460,000	November 2012	315,000
21 East 66th Street(5)	Private Investors	32.28%	32.28%	13,069	December 2012	75,000
650 Fifth Avenue(6)	Jeff Sutton	50.00%	50.00%	69,214	November 2013	—
121 Greene Street	Jeff Sutton	50.00%	50.00%	7,131	September 2014	27,400
175-225 Third Street Brooklyn, New York	KCLW 3rd Street LLC/LIVWRK LLC	95.00%	95.00%	—	October 2014	74,600
55 West 46th Street	Prudential Real Estate Investors	25.00%	25.00%	347,000	November 2014	295,000
Stonehenge Portfolio (7)	Various	Various	Various	1,439,016	February 2015	36,668
131-137 Spring Street	Invesco Real Estate	20.00%	20.00%	68,342	August 2015	277,750
605 West 42nd Street	The Moinian Group	20.00%	20.00%	927,358	April 2016	759,000
11 Madison Avenue	PGIM Real Estate	60.00%	60.00%	2,314,000	August 2016	2,605,000
333 East 22nd Street (8)	Private Investors	33.33%	33.33%	26,926	August 2016	—
400 E 57th Street (9)	BlackRock, Inc and Stonehenge Partners	51.00%	41.00%	290,482	October 2016	170,000
One Vanderbilt (10)	National Pension Service of Korea/Hines Interest LP	71.01%	71.01%	—	January 2017	3,310,000
Mezzanine Loan (11)	Private Investors	33.33%	33.33%	—	May 2017	15,000

(1) Ownership interest and economic interest represent the Company's interests in the joint venture as of September 30, 2017. Changes in ownership or economic interests, if any, within the current year are disclosed in the notes below.

(2) Acquisition date and price represent the date on which the Company initially acquired an interest in the joint venture and the actual or implied gross purchase price for the joint venture on that date. Acquisition date and price are not adjusted for subsequent acquisitions or dispositions of interest.

(3) As a result of the sale of a condominium interest in September 2012, Young & Rubicam, Inc., or Y&R, owns floors three through eight at the property. Because the joint venture has an option to repurchase these floors, the gain associated with this sale was deferred.

(4) The purchase price represents only the purchase of the 1552 Broadway interest which comprised approximately 13,045 square feet. The joint venture also owns a long-term leasehold interest in the retail space and certain other spaces at 1560 Broadway, which is adjacent to 1552 Broadway.

(5) We hold a 32.28% interest in three retail and two residential units at the property and a 16.14% interest in three residential units at the property.

(6) The joint venture owns a long-term leasehold interest in the retail space at 650 Fifth Avenue. In connection with the ground lease obligation, SLG provided a performance guaranty and our joint venture partner executed a contribution agreement to reflect its pro rata obligation. In the event the property is converted into a condominium unit and the landlord elects the purchase option, the joint venture shall be obligated to acquire the unit at the then fair value.

(7) In March 2017, the Company sold a partial interest in the Stonehenge Portfolio as further described under Sale of Joint Venture Interest or Properties below.

(8) The joint venture acquired a leasehold interest in the property in October 2016.

(9) In October 2016, the Company sold a 49% interest in this property to an investment account managed by BlackRock, Inc. The Company's interest in the property was sold within a consolidated joint venture owned 90% by the Company and 10% by Stonehenge. The transaction resulted in the deconsolidation of the venture's remaining 51% interest in the property. The Company's joint venture with Stonehenge remains consolidated resulting in the combined 51% interest being shown within investments in unconsolidated joint ventures on the Company's balance sheet.

(10) In January 2017, the Company admitted two partners, National Pension Service of Korea and Hines Interest LP, into the One Vanderbilt Avenue development project. In April 2017, the criteria for deconsolidation were met, and the development is shown within investments in unconsolidated joint ventures. The

30

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

partners have committed aggregate equity to the project totaling no less than $525 million and their ownership interest in the joint venture is based on their capital contributions, up to an aggregate maximum of 29.0%. At September 30, 2017 the total of the two partners' ownership interests based on equity contributed was 3.49%.

(11) In May 2017, the Company contributed a mezzanine loan secured by a commercial property in midtown Manhattan to a joint venture and retained a 33.33% interest in the venture. The carrying value is net of $10.0 million that was sold, which is included in other assets and other liabilities on the consolidated balance sheets as a result of the transfers not meeting the conditions for sale accounting. In October 2017, the initial maturity date of November 2017 was extended to November 2018.

Acquisition, Development and Construction Arrangements

Based on the characteristics of the following arrangements, which are similar to those of an investment, combined with the expected residual profit of not greater than 50%, we have accounted for these debt and preferred equity investments under the equity method. As of September 30, 2017 and December 31, 2016, the carrying value for acquisition, development and construction arrangements were as follows (in thousands):

Loan Type	September 30, 2017		December 31, 2016		Maturity Date
Mezzanine Loan and Preferred Equity(1)	$	100,000	$	100,000	March 2018
Mezzanine Loan(2)	44,881		45,622		February 2022
Mezzanine Loan(3)	25,854		24,542		July 2036
	$	170,735	$	170,164

(1) These loans were extended in February 2017.

(2) We have an option to convert our loan to an equity interest subject to certain conditions. We have determined that our option to convert the loan to equity is not a derivative financial instrument pursuant to GAAP.

(3) The Company has the ability to convert this loan into an equity position starting in 2021 and the borrower is able to force this conversion in 2024.

Sale of Joint Venture Interests or Properties

The following table summarizes the investments in unconsolidated joint ventures sold during the nine months ended September 30, 2017:

Property	Ownership Interest	Disposition Date	Type of Sale	Gross Asset Valuation (in thousands)(1)		Gain on Sale (in thousands)(2)
Stonehenge Portfolio (partial)	Various	March 2017	Ownership Interest	$	300,000	$	871
102 Greene Street	10.00%	September 2017	Ownership Interest	$	43,500	$	283

(1) Represents implied gross valuation for the joint venture or sales price of the property.

(2) Represents the Company's share of the gain.

In May 2017, our investment in a joint venture that owned two mezzanine notes secured by interests in the entity that owns 76 11th Avenue was repaid after the joint venture received repayment of the underlying loans.

In May 2017, we recognized a gain of $13.0 million related to the sale in May 2014 of our ownership interest in 747 Madison Avenue. The sale did not meet the criteria for sale accounting at that time and, therefore, remained on our consolidated financial statements. The sale criteria was met in the second quarter of 2017 resulting in recognition of the deferred gain on the sale.

Joint Venture Mortgages and Other Loans Payable

We generally finance our joint ventures with non-recourse debt. In certain cases we have provided guarantees or master leases for tenant space, which terminate upon the satisfaction of specified circumstances or repayment of the underlying loans. The first mortgage notes and other loans payable collateralized by the respective joint venture properties and assignment of leases at September 30, 2017 and December 31, 2016, respectively, are as follows (amounts in thousands):

Property	Economic Interest (1)		Maturity Date	Interest Rate (2)		September 30, 2017		December 31, 2016
Fixed Rate Debt:
521 Fifth Avenue	50.50	%	November 2019	3.73	%	$	170,000	$	170,000
717 Fifth Avenue (3)	10.92	%	July 2022	4.45	%	300,000		300,000

31

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

Property	Economic Interest (1)		Maturity Date	Interest Rate (2)		September 30, 2017			December 31, 2016
717 Fifth Avenue (3)	10.92	%	July 2022	5.50	%	355,328			355,328
650 Fifth Avenue	50.00	%	October 2022	4.95	%	225,000			—
21 East 66th Street	32.28	%	April 2023	3.60	%	12,000			12,000
3 Columbus Circle	48.90	%	March 2025	3.61	%	350,000			350,000
11 Madison Avenue	60.00	%	September 2025	3.84	%	1,400,000			1,400,000
800 Third Avenue	60.52	%	February 2026	3.37	%	177,000			177,000
400 East 57th Street	41.00	%	November 2026	3.00	%	100,000			100,000
Stonehenge Portfolio (4)	Various		Various	4.17	%	359,095			362,518
1745 Broadway (5)						—			340,000
Total fixed rate debt						$	3,448,423		$	3,566,846
Floating Rate Debt:
55 West 46th Street (6)	25.00	%	October 2017	3.52	%	$	165,328		$	157,322
175-225 Third Street Brooklyn, New York	95.00	%	December 2017	5.25	%	40,000			40,000
Jericho Plaza (7)	11.67	%	March 2018	5.37	%	79,530			76,993
724 Fifth Avenue	50.00	%	April 2018	3.64	%	275,000			275,000
1552 Broadway (8)	50.00	%	April 2018	5.41	%	185,410			185,410
280 Park Avenue (9)	50.00	%	September 2019	3.09	%	1,200,000			900,000
121 Greene Street	50.00	%	November 2019	2.72	%	15,000			15,000
1745 Broadway (10)	56.87	%	January 2020	3.07	%	345,000			—
10 East 53rd Street	55.00	%	February 2020	3.47	%	170,000			125,000
131-137 Spring Street	20.00	%	August 2020	2.77	%	141,000			141,000
11 West 34th Street	30.00	%	January 2021	2.68	%	23,000			23,000
100 Park Avenue	49.90	%	February 2021	2.97	%	360,000			360,000
One Vanderbilt (11)	71.01	%	September 2021	4.72	%	271,229			—
605 West 42nd Street (12)	20.00	%	August 2027	2.84	%	550,000			539,000
21 East 66th Street	32.28	%	June 2033	3.62	%	1,667			1,726
Stonehenge Portfolio	Various		April 2018	2.47	%	55,340			65,577
650 Fifth Avenue (13)						—			77,500
Total floating rate debt						$	3,877,504		$	2,982,528
Total joint venture mortgages and other loans payable						$	7,325,927		$	6,549,374
Deferred financing costs, net						(127,318		)	(95,408		)
Total joint venture mortgages and other loans payable, net						$	7,198,609		$	6,453,966

(1) Economic interest represent the Company's interests in the joint venture as of September 30, 2017. Changes in ownership or economic interests, if any, within the current year are disclosed in the notes to the investment in unconsolidated joint ventures note above.

(2) Effective weighted average interest rate for the three months ended September 30, 2017, taking into account interest rate hedges in effect during the period.

(3) These loans are comprised of a $300.0 million fixed rate mortgage loan and $355.3 million mezzanine loan. The mezzanine loan is subject to accretion based on the difference between contractual interest rate and contractual pay rate.

(4) Amount is comprised of $34.0 million, $137.7 million, $172.5 million, and $14.9 million in fixed-rate mortgages that mature in November 2017, August 2019, June 2024, and February 2027, respectively.

(5) In January 2017, this loan was refinanced with a floating rate loan as shown above.

(6) This loan has a committed amount of $190.0 million, of which $24.7 million was unfunded as of September 30, 2017. In October 2017, this loan was refinanced with a new $195.0 million mortgage loan with a floating interest rate of 213 basis points over 30-day LIBOR and a maturity date of November 2020.

(7) The property secures a two year $100.0 million loan, of which $79.5 million is currently outstanding.

(8) These loans are comprised of a $145.0 million mortgage loan and a $41.5 million mezzanine loan. As of September 30, 2017, $0.6 million of the mortgage loan and $0.5 million of the mezzanine loan were unfunded. In October 2017, this loan was refinanced with a new $195.0 million mortgage loan with a floating interest rate of 265 basis points over 30-day LIBOR and a maturity date of October 2020.

(9) In August 2017, this loan was refinanced with a new $1.075 billion mortgage loan and a new $125.0 million mezzanine loan, which carry floating interest rates of 148 basis points over 30-day LIBOR and 385 basis points over 30-day LIBOR, respectively. Both the mortgage loan and mezzanine loan initially mature in September 2019.

(10) This loan has a committed amount of $375.0 million, of which $30.0 million was unfunded as of September 30, 2017.

32

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

(11) This loan is a $1.5 billion construction facility in connection with the development of One Vanderbilt. This facility bears interest at 350 basis points over 30-day LIBOR, with reduction based on meeting certain conditions, and has an initial five-year term with twoone-year extension options. Advances under the loan are subject to incurred costs, funded equity, loan to value thresholds, and entering into construction contracts.

(12) In August 2017, this loan was refinanced with a new $550.0 million mortgage note, with a floating interest rate of 144 basis points over 30-day LIBOR and a maturity date of August 2027.

(13) In September 2017, this loan was refinanced with a fixed rate loan as shown above.

We act as the operating partner and day-to-day manager for all our joint ventures, except for 800 Third Avenue, Jericho Plaza, 280 Park Avenue, 3 Columbus Circle, 21 East 66th Street, 175-225 Third Street, 605 West 42nd Street, 400 East 57th Street, and the Stonehenge Portfolio. We are entitled to receive fees for providing management, leasing, construction supervision and asset management services to certain of our joint ventures. We earned $2.9 million and $28.1 million from these services for the three and nine months ended September 30, 2017, respectively. We earned $2.0 million and $4.5 million from these services for the three and nine months ended September 30, 2016, respectively. In addition, we have the ability to earn incentive fees based on the ultimate financial performance of certain of the joint venture properties.

The combined balance sheets for the unconsolidated joint ventures, at September 30, 2017 and December 31, 2016 are as follows (in thousands):

	September 30, 2017		December 31, 2016
Assets
Commercial real estate property, net	$	9,944,280	$	9,131,717
Cash and restricted cash	370,596		328,455
Tenant and other receivables, related party receivables, and deferred rents receivable, net of allowance	267,244		232,778
Debt and preferred equity investments, net	201,731		336,164
Other assets	636,365		683,481
Total assets	$	11,420,216	$	10,712,595
Liabilities and members' equity
Mortgages and other loans payable, net	$	7,198,609	$	6,453,966
Deferred revenue/gain	340,310		356,414
Other liabilities	411,261		391,500
Members' equity	3,470,036		3,510,715
Total liabilities and members' equity	$	11,420,216	$	10,712,595
Company's investments in unconsolidated joint ventures	$	2,045,796	$	1,890,186

The combined statements of operations for the unconsolidated joint ventures, for the three and nine months ended September 30, 2017 and 2016, are as follows (in thousands):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Total revenues	$	216,100		$	184,221		$	643,210		$	498,308
Operating expenses	38,055			34,727			115,996			89,147
Ground rent	4,182			3,744			12,612			10,670
Real estate taxes	37,282			30,814			107,391			79,356
Interest expense, net of interest income	61,066			51,789			176,096			147,876
Amortization of deferred financing costs	4,030			7,155			17,994			17,667
Transaction related costs	—			5,359			146			5,359
Depreciation and amortization	61,447			56,890			198,556			132,035
Total expenses	206,062			190,478			628,791			482,110
Loss on early extinguishment of debt	(7,638		)	—			(7,638		)	(1,606		)
Net income (loss) before gain on sale	$	2,400		$	(6,257	)	$	6,781		$	14,592
Company's equity in net income (loss) from unconsolidated joint ventures	$	4,078		$	(3,968	)	$	14,104		$	11,969

33

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

7. Deferred Costs

Deferred costs at September 30, 2017 and December 31, 2016 consisted of the following (in thousands):

	September 30, 2017			December 31, 2016
Deferred leasing costs	$	464,788		$	468,971
Less: accumulated amortization	(216,807		)	(201,371		)
Deferred costs, net	$	247,981		$	267,600

8. Mortgages and Other Loans Payable

The first mortgages and other loans payable collateralized by the respective properties and assignment of leases or debt investments at September 30, 2017 and December 31, 2016, respectively, were as follows (amounts in thousands):

Property	Maturity Date	Interest Rate (1)		September 30, 2017			December 31, 2016
Fixed Rate Debt:
Unsecured Loan	June 2018	4.81	%	$	16,000		$	16,000
One Madison Avenue	May 2020	5.91	%	494,264			517,806
762 Madison Avenue	February 2022	5.00	%	771			7,694
100 Church Street	July 2022	4.68	%	218,237			221,446
919 Third Avenue (2)	June 2023	5.12	%	500,000			500,000
420 Lexington Avenue	October 2024	3.99	%	300,000			300,000
1515 Broadway	March 2025	3.93	%	876,613			888,531
400 East 58th Street (3)	November 2026	3.00	%	40,000			40,000
Landmark Square	January 2027	4.90	%	100,000			100,000
485 Lexington Avenue	February 2027	4.25	%	450,000			450,000
1080 Amsterdam (4)	February 2027	3.58	%	36,363			—
315 West 33rd Street	February 2027	4.17	%	250,000			—
Series J Preferred Units (5)	April 2051	3.75	%	4,000			4,000
885 Third Avenue (6)				—			267,650
FHLBNY Facility (7)				—			105,000
FHLBNY Facility (7)				—			100,000
Total fixed rate debt				$	3,286,248		$	3,518,127
Floating Rate Debt:
719 Seventh Avenue	February 2018	4.27	%	$	41,171		$	37,388
183, 187 Broadway & 5-7 Dey Street	May 2018	3.92	%	58,000			58,000
2016 Master Repurchase Agreement	July 2018	3.73	%	184,642			184,642
220 East 42nd Street	October 2020	2.82	%	275,000			275,000
One Vanderbilt Avenue (8)				—			64,030
1080 Amsterdam (9)				—			3,525
Total floating rate debt				$	558,813		$	622,585
Total fixed rate and floating rate debt				$	3,845,061		$	4,140,712
Mortgages reclassed to liabilities related to assets held for sale				—			—
Total mortgages and other loans payable				$	3,845,061		$	4,140,712
Deferred financing costs, net of amortization				(40,887		)	(66,882		)
Total mortgages and other loans payable, net				$	3,804,174		$	4,073,830

(1) Effective weighted average interest rate for the quarter ended September 30, 2017, taking into account interest rate hedges in effect during the period.

(2) We own a 51.0% controlling interest in the consolidated joint venture that is the borrower on this loan.

(3) The loan carries a fixed interest rate of 3.00% for the first 5 years and is prepayable without penalty in year 5.

34

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

(4) The loan is comprised of a $35.5 million mortgage loan and $0.9 million subordinate loan with a fixed interest rate of 3.50% and 7.00%, respectively, for the first 5 years and is prepayable without penalty in year 5.

(5) In connection with the acquisition of a commercial real estate property, the Operating Partnership issued $4.0 million, 3.75% Series J Preferred Units of limited partnership interest, or the Series J Preferred Units, with a mandatory liquidation preference of $1,000 per unit. The Series J Preferred Units are accounted for as debt because they can be redeemed in cash by the Operating Partnership on the earlier of (i) the date of the sale of the property or (ii) April 30, 2051 or at the option of the unitholders as provided for in the related agreement.

(6) In February 2016, we closed on the sale of 885 Third Avenue. The sale did not meet the criteria for sale accounting at that time. In April 2017, the mortgage was refinanced by the buyer, resulting in the Company deconsolidating the property from its financial statements in the second quarter of 2017.

(7) The facility was repaid in January 2017.

(8) In September 2016, we closed on a $1.5 billion construction facility in connection with the development of One Vanderbilt Avenue. In January 2017, we admitted two partners, National Pension Service of Korea and Hines Interest LP, into the One Vanderbilt Avenue development project. In April 2017, the criteria for deconsolidation were met, and the development is shown within investments in unconsolidated joint ventures. See Note 6, "Investments in Unconsolidated Joint Ventures".

(9) In January 2017, this loan was refinanced with a fixed rate loan as shown above.

At September 30, 2017 and December 31, 2016, the gross book value of the properties and debt and preferred equity investments collateralizing the mortgages and other loans payable, not including assets held for sale, was approximately $6.7 billion and $6.0 billion, respectively.

Federal Home Loan Bank of New York Facility

The Company’s wholly-owned subsidiary, Belmont Insurance Company, or Belmont, a New York licensed captive insurance company, was a member of the Federal Home Loan Bank of New York, or FHLBNY. In January 2017, all funds borrowed from the FHLBNY were repaid and Belmont's membership was terminated in February 2017.

Master Repurchase Agreements

The Company has entered into two Master Repurchase Agreements, or MRAs, known as the 2016 MRA and 2017 MRA, which provide us with the ability to sell certain debt investments with a simultaneous agreement to repurchase the same at a certain date or on demand. We seek to mitigate risks associated with our repurchase agreement by managing the credit quality of our assets, early repayments, interest rate volatility, liquidity, and market value. The margin call provisions under our repurchase facilities permit valuation adjustments based on capital markets activity, and are not limited to collateral-specific credit marks. To monitor credit risk associated with our debt investments, our asset management team regularly reviews our investment portfolio and is in contact with our borrowers in order to monitor the collateral and enforce our rights as necessary. The risk associated with potential margin calls is further mitigated by our ability to recollateralize the facility with additional assets from our portfolio of debt investments, our ability to satisfy margin calls with cash or cash equivalents and our access to additional liquidity through the 2012 credit facility, as defined below.

In June 2017, we entered into the 2017 MRA, with a maximum facility capacity of $300.0 million. The facility bears interest on a floating rate basis at a spread to 30-day LIBOR based on the pledged collateral and advance rate and has an initial one year term, with twoone year extension options. At September 30, 2017, the facility had a carrying value of $(1.1) million, representing deferred financing costs presented within other liabilities.

In July 2016, we entered into a restated 2016 MRA, with a maximum facility capacity of $300.0 million. The facility bears interest ranging from 225 and 400 basis points over 30-day LIBOR depending on the pledged collateral and has an initial two-year term, with a one year extension option. Since December 6, 2015, we have been required to pay monthly in arrears a 25 basis point fee on the excess of $150.0 million over the average daily balance during the period when the average daily balance is less than $150.0 million. At September 30, 2017, the facility had a carrying value of $182.8 million, net of deferred financing costs.

35

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

9. Corporate Indebtedness

2012 Credit Facility

In August 2016, we entered into an amendment to the credit facility that was originally entered into by the Company in November 2012, referred to as the 2012 credit facility. As of September 30, 2017, the 2012 credit facility, as amended, consisted of a $1.6 billion revolving credit facility and a $1.2 billion term loan, with a maturity date of March 29, 2019 and June 30, 2019, respectively. The revolving credit facility has an as-of-right extension to March 29, 2020. We also have an option, subject to customary conditions, to increase the capacity under the revolving credit facility to $3.0 billion at any time prior to the maturity date for the revolving credit facility without the consent of existing lenders, by obtaining additional commitments from our existing lenders and other financial institutions.

As of September 30, 2017, the 2012 credit facility bore interest at a spread over LIBOR ranging from (i) 87.5 basis points to 155 basis points for loans under the revolving credit facility and (ii) 95 basis points to 190 basis points for loans under the term loan facility, in each case based on the credit rating assigned to the senior unsecured long term indebtedness of ROP.

At September 30, 2017, the applicable spread was 125 basis points for the revolving credit facility and 140 basis points for the term loan facility. At September 30, 2017, the effective interest rate, including the effect of interest rate swaps, was 2.49% for the revolving credit facility and 2.49% for the term loan facility. We are required to pay quarterly in arrears a 12.5 to 30 basis point facility fee on the total commitments under the revolving credit facility based on the credit rating assigned to the senior unsecured long term indebtedness of ROP. As of September 30, 2017, the facility fee was 25 basis points.

As of September 30, 2017, we had $80.8 million of outstanding letters of credit, $280.0 million drawn under the revolving credit facility and $1.2 billion outstanding under the term loan facility, with total undrawn capacity of $1.2 billion under the 2012 credit facility. At September 30, 2017 and December 31, 2016, the revolving credit facility had a carrying value of $275.8 million and $(6.3) million, respectively, net of deferred financing costs. The December 31, 2016 carrying value represents deferred financing costs and is presented within other liabilities. At September 30, 2017 and December 31, 2016, the term loan facility had a carrying value of $1.2 billion and $1.2 billion, respectively, net of deferred financing costs.

The Company, the Operating Partnership and ROP are all borrowers jointly and severally obligated under the 2012 credit facility. None of our other subsidiaries are obligors under the 2012 credit facility.

The 2012 credit facility includes certain restrictions and covenants (see Restrictive Covenants below).

Senior Unsecured Notes

The following table sets forth our senior unsecured notes and other related disclosures as of September 30, 2017 and December 31, 2016, respectively, by scheduled maturity date (dollars in thousands):

Issuance	September 30, 2017 Unpaid Principal Balance		September 30, 2017 Accreted Balance			December 31, 2016 Accreted Balance			Coupon Rate (1)		Effective Rate		Initial Term (in Years)	Maturity Date
October 12, 2010 (2)	$	269,000	$	268,628		$	334,077		3.00	%	3.00	%	7	October 2017
August 5, 2011 (3)	250,000		249,934			249,880			5.00	%	5.00	%	7	August 2018
March 16, 2010 (3)	250,000		250,000			250,000			7.75	%	7.75	%	10	March 2020
November 15, 2012 (3)	200,000		200,000			200,000			4.50	%	4.50	%	10	December 2022
December 17, 2015 (3)	100,000		100,000			100,000			4.27	%	4.27	%	10	December 2025
	$	1,069,000	$	1,068,562		$	1,133,957
Deferred financing costs, net			(4,018		)	(5,642		)
	$	1,069,000	$	1,064,544		$	1,128,315

(1) Interest on the senior unsecured notes is payable semi-annually with principal and unpaid interest due on the scheduled maturity dates.

(2) Issued by the Operating Partnership. The notes were senior unsecured obligations of the Operating Partnership and exchangeable at a calculated exchange rate upon the occurrence of specified events and during the period beginning on the twenty-second scheduled trading day prior to the maturity date and ending on the second business day prior to the maturity date, into cash, or a combination of cash and shares of SL Green's common stock, if any, at our option. In accordance with the terms of the indenture, the notes became exchangeable commencing September 14, 2017 and the Operating Partnership elected to settle exchanges in cash. In October 2017, all note holders elected to exchange the notes and the notes were repaid for $350.8 million, excluding accrued interest based on the applicable exchange rate.

36

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

(3) Issued by the Company, the Operating Partnership and ROP, as co-obligors. In October 2017, the Company, the Operating Partnership and ROP, as co-obligors issued an additional $100.0 million of the 4.50% senior unsecured bonds due December 2022. The additional notes priced at 105.334% plus accrued interest from June 1, 2017, with a yield to maturity of 3.298%.

In October 2017, the Company issued $500.0 million of senior unsecured notes which will mature in October 2022 and bear interest at a fixed rate of 3.25%.

Restrictive Covenants

The terms of the 2012 credit facility, as amended, and certain of our senior unsecured notes include certain restrictions and covenants which may limit, among other things, our ability to pay dividends, make certain types of investments, incur additional indebtedness, incur liens and enter into negative pledge agreements and dispose of assets, and which require compliance with financial ratios relating to the maximum ratio of total indebtedness to total asset value, a minimum ratio of EBITDA to fixed charges, a maximum ratio of secured indebtedness to total asset value and a maximum ratio of unsecured indebtedness to unencumbered asset value. The dividend restriction referred to above provides that, we will not during any time when a default is continuing, make distributions with respect to common stock or other equity interests, except to enable the Company to continue to qualify as a REIT for Federal income tax purposes. As of September 30, 2017 and 2016, we were in compliance with all such covenants.

Junior Subordinated Deferrable Interest Debentures

In June 2005, the Company and the Operating Partnership issued $100.0 million in unsecured trust preferred securities through a newly formed trust, SL Green Capital Trust I, or the Trust, which is a wholly-owned subsidiary of the Operating Partnership. The securities mature in 2035 and bear interest at a floating rate of 125 basis points over the three-month LIBOR. The effective weighted average interest rate for the quarter ended September 30, 2017 was 2.52%. Interest payments may be deferred for a period of up to eight consecutive quarters if the Operating Partnership exercises its right to defer such payments. The Trust preferred securities are redeemable at the option of the Operating Partnership, in whole or in part, with no prepayment premium. We do not consolidate the Trust even though it is a variable interest entity as we are not the primary beneficiary. Because the Trust is not consolidated, we have recorded the debt on our consolidated balance sheets and the related payments are classified as interest expense.

Principal Maturities

Combined aggregate principal maturities of mortgages and other loans payable, 2012 credit facility, trust preferred securities, senior unsecured notes and our share of joint venture debt as of September 30, 2017, including as-of-right extension options and put options, were as follows (in thousands):

	Scheduled Amortization		Principal		Revolving Credit Facility		Unsecured Term Loan		Trust Preferred Securities		Senior Unsecured Notes			Total		Joint Venture Debt
Remaining 2017	$	12,846	$	—	$	—	$	—	$	—	$	269,000	(1)	$	281,846	$	79,787
2018	54,937		299,813		—		—		—		250,000			604,750		242,799
2019	59,618		—		—		1,183,000		—		—			1,242,618		705,574
2020	41,427		679,531		280,000		—		—		250,000			1,250,958		320,914
2021	30,418		—		—		—		—		—			30,418		376,765
Thereafter	90,532		2,575,939		—		—		100,000		300,000			3,066,471		1,465,371
	$	289,778	$	3,555,283	$	280,000	$	1,183,000	$	100,000	$	1,069,000		$	6,477,061	$	3,191,210

(1) The $269.0 million of 3.00% convertible notes which matured in October 2017 became exchangeable commencing September 14, 2017 and the Operating Partnership elected to settle exchanges in cash. In October 2017, all note holders elected to exchange the notes and the notes were repaid for $350.8 million.

37

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

Consolidated interest expense, excluding capitalized interest, was comprised of the following (in thousands):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Interest expense before capitalized interest	$	72,859		$	78,715		$	217,273		$	276,437
Interest capitalized	(6,869		)	(6,084		)	(19,892		)	(18,135		)
Interest income	(356		)	(66		)	(1,269		)	(1,976		)
Interest expense, net	$	65,634		$	72,565		$	196,112		$	256,326

10. Related Party Transactions

Cleaning/ Security/ Messenger and Restoration Services

Alliance Building Services, or Alliance, and its affiliates are partially owned by Gary Green, a son of Stephen L. Green, the chairman of SL Green's board of directors, and provide services to certain properties owned by us. Alliance’s affiliates include First Quality Maintenance, L.P., or First Quality, Classic Security LLC, Bright Star Couriers LLC and Onyx Restoration Works, and provide cleaning, extermination, security, messenger, and restoration services, respectively. In addition, First Quality has the non-exclusive opportunity to provide cleaning and related services to individual tenants at our properties on a basis separately negotiated with any tenant seeking such additional services. The Service Corporation has entered into an arrangement with Alliance whereby it will receive a profit participation above a certain threshold for services provided by Alliance to certain tenants at certain buildings above the base services specified in their lease agreements.

Income earned from profit participation, which is included in other income on the consolidated statements of operations, was $1.0 million and $3.0 million for the three and nine months ended September 30, 2017, respectively, and was $0.8 million and $2.6 million for the three and nine months ended September 30, 2016, respectively.

We also recorded expenses for these services, inclusive of capitalized expenses, of $5.7 million and $16.0 million for the three and nine months ended September 30, 2017, respectively, for these services (excluding services provided directly to tenants), and $5.3 million and $16.1 million for the three and nine months ended September 30, 2016, respectively.

Management Fees

S.L. Green Management Corp., a consolidated entity, receives property management fees from an entity in which Stephen L. Green owns an interest. We received management fees from this entity of $0.1 million and $0.4 million for the three and nine months ended September 30, 2017, respectively, and $0.1 million and $0.3 million for the three and nine months ended September 30, 2016, respectively.

One Vanderbilt Investment

In December 2016, we entered into agreements with entities owned and controlled by Marc Holliday and Andrew Mathias, pursuant to which they agreed to make an investment in our One Vanderbilt project at the appraised fair market value for the interests acquired. This investment entitles these entities to receive approximately 1.50% - 1.80% and 1.00% - 1.20%, respectively, of any profits realized by the Company from its One Vanderbilt project in excess of the Company’s capital contributions. The entities have no right to any return of capital. Accordingly, subject to previously disclosed repurchase rights, these interests will have no value and will not entitle these entities to any amounts (other than limited distributions to cover tax liabilities incurred) unless and until the Company has received distributions from the One Vanderbilt project in excess of the Company’s aggregate investment in the project. In the event that the Company does not realize a profit on its investment in the project (or would not realize a profit based on the value at the time the interests are repurchased), the entities owned and controlled by Messrs. Holliday and Mathias will lose the entire amount of their investment.

Fifty percent of these interests were purchased on December 31, 2016 and the remaining fifty percent will be purchased on December 31, 2017. The entities owned and controlled by Messrs. Holliday and Mathias will pay $1.4 million and $1.0 million, respectively, which equals the fair market value of the interests acquired as of the date the investment agreements were entered into as determined by an independent third party appraisal that we obtained.

38

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

Other

We are entitled to receive fees for providing management, leasing, construction supervision and asset management services to certain of our joint ventures as further described in Investments in Unconsolidated Joint Ventures. Amounts due from joint ventures and related parties at September 30, 2017 and December 31, 2016 consisted of the following (in thousands):

	September 30, 2017		December 31, 2016
Due from joint ventures	$	16,736	$	1,240
Other	7,332		14,616
Related party receivables	$	24,068	$	15,856

11. Noncontrolling Interests on the Company's Consolidated Financial Statements

Noncontrolling interests represent the common and preferred units of limited partnership interest in the Operating Partnership not held by the Company as well as third party equity interests in our other consolidated subsidiaries. Noncontrolling interests in the Operating Partnership are shown in the mezzanine equity while the noncontrolling interests in our other consolidated subsidiaries are shown in the equity section of the Company’s consolidated financial statements.

Common Units of Limited Partnership Interest in the Operating Partnership

As of September 30, 2017 and December 31, 2016, the noncontrolling interest unit holders owned 4.45%, or 4,541,765 units, and 4.16%, or 4,363,716 units, of the Operating Partnership, respectively. As of September 30, 2017, 4,541,765 shares of SL Green's common stock were reserved for issuance upon the redemption of units of limited partnership interest of the Operating Partnership.

Noncontrolling interests in the Operating Partnership is recorded at the greater of its cost basis or fair market value based on the closing stock price of SL Green's common stock at the end of the reporting period.

Below is the rollforward analysis of the activity relating to the noncontrolling interests in the Operating Partnership as of September 30, 2017 and December 31, 2016 (in thousands):

	September 30, 2017			December 31, 2016
Balance at beginning of period	$	473,882		$	424,206
Distributions	(10,639		)	(12,671		)
Issuance of common units	23,273			78,495
Redemption of common units	(15,353		)	(31,805		)
Net income	2,707			10,136
Accumulated other comprehensive income allocation	(303		)	1,299
Fair value adjustment	(2,669		)	4,222
Balance at end of period	$	470,898		$	473,882

Preferred Units of Limited Partnership Interest in the Operating Partnership

The Operating Partnership has 1,902,0004.50% Series G Preferred Units of limited partnership interest, or the Series G Preferred Units outstanding, with a liquidation preference of $25.00 per unit, which were issued in January 2012 in conjunction with an acquisition. The Series G Preferred unitholders receive annual dividends of $1.125 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series G Preferred Units are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) $88.50. The common units of limited partnership interest in the Operating Partnership may be redeemed in exchange for SL Green's common stock on a 1-to-1 basis. The Series G Preferred Units also provide the holder with the right to require the Operating Partnership to repurchase the Series G Preferred Units for cash before January 31, 2022.

The Operating Partnership has 60 Series F Preferred Units outstanding with a mandatory liquidation preference of $1,000.00 per unit.

The Operating Partnership has authorized up to 700,0003.50% Series K Preferred Units of limited partnership interest, or the Series K Preferred Units, with a liquidation preference of $25.00 per unit. In August 2014, the Company issued 563,954 Series

39

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

K Preferred Units in conjunction with an acquisition. The Series K Preferred unitholders receive annual dividends of $0.875 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series K Preferred Units can be redeemed at any time, at the option of the unitholder, either for cash or are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) $134.67.

The Operating Partnership has authorized up to 500,0004.00% Series L Preferred Units of limited partnership interest, or the Series L Preferred Units, with a liquidation preference of $25.00 per unit. In August 2014, the Company issued 378,634 Series L Preferred Units in conjunction with an acquisition. The Series L Preferred unitholders receive annual dividends of $1.00 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series L Preferred Units can be redeemed at any time at par for cash at the option of the unitholder.

The Operating Partnership has authorized up to 1,600,0003.75% Series M Preferred Units of limited partnership interest, or the Series M Preferred Units, with a liquidation preference of $25.00 per unit. In February 2015, the Company issued 1,600,000 Series M Preferred Units in conjunction with the acquisition of ownership interests in and relating to certain residential and retail real estate properties. The Series M Preferred unitholders receive annual dividends of $0.9375 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series M Preferred Units can be redeemed at any time at par for cash at the option of the unitholder.

The Operating Partnership has authorized up to 552,3033.00% Series N Preferred Units of limited partnership interest, or the Series N Preferred Units, with a liquidation preference of $25.00 per unit. In June 2015, the Company issued 552,303 Series N Preferred Units in conjunction with an acquisition. The Series N Preferred unitholders receive annual dividends of $0.75 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series N Preferred Units can be redeemed at any time at par for cash at the option of the unitholder.

The Operating Partnership has authorized an aggregate of one6.25% Series O Preferred Unit of limited partnership interest, or the Series O Preferred Unit. In June 2015, the Company issued the Series O Preferred Unit in connection with an acquisition.

The Operating Partnership has authorized up to 200,0004.00% Series P Preferred Units of limited partnership interest, or the Series P Preferred Units, with a liquidation preference of $25.00 per unit. In July 2015, the Company issued 200,000 Series P Preferred Units in conjunction with an acquisition. The Series P Preferred unitholders receive annual dividends of $1.00 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series P Preferred Units can be redeemed at any time at par for cash at the option of the unitholder.

The Operating Partnership has authorized up to 268,0003.50% Series Q Preferred Units of limited partnership interest, or the Series Q Preferred Units, with a liquidation preference of $25.00 per unit. In July 2015, the Company issued 268,000 Series Q Preferred Units in conjunction with an acquisition. The Series Q Preferred unitholders receive annual dividends of $0.875 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series Q Preferred Units can be redeemed at any time, at the option of the unitholder, either for cash or are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) $148.95.

The Operating Partnership has authorized up to 400,0003.50% Series R Preferred Units of limited partnership interest, or the Series R Preferred Units, with a liquidation preference of $25.00 per unit. In August 2015, the Company issued 400,000 Series R Preferred Units in conjunction with an acquisition. The Series R Preferred unitholders receive annual dividends of $0.875 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series R Preferred Units can be redeemed at any time, at the option of the unitholder, either for cash or are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) $154.89.

The Operating Partnership has authorized up to 1,077,2804.00% Series S Preferred Units of limited partnership interest, or the Series S Preferred Units, with a liquidation preference of $25.00 per unit. In August 2015, the Company issued 1,077,280 Series S Preferred Units in conjunction with an acquisition. The Series S Preferred unitholders receive annual dividends of $1.00 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series S Preferred Units can be redeemed at any time at par for cash at the option of the unitholder.

The Operating Partnership has authorized up to 230,0002.75% Series T Preferred Units of limited partnership interest, or the Series T Preferred Units, with a liquidation preference of $25.00 per unit. In March 2016, the Company issued 230,000 Series T Preferred Units in conjunction with an acquisition. The Series T Preferred unitholders receive annual dividends of $0.6875 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series T Preferred Units can be

40

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

redeemed at any time at par, at the option of the unitholder, either for cash or are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) $119.02.

The Operating Partnership has authorized up to 680,0004.50% Series U Preferred Units of limited partnership interest, or the Series U Preferred Units, with a liquidation preference of $25.00 per unit. In March 2016, the Company issued 680,000 Series U Preferred Units in conjunction with an acquisition. The Series U Preferred unitholders initially receive annual dividends of $1.125 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The annual dividend is subject to reduction upon the occurence of certain circumstances set forth in the terms of the Series U Preferred Units. The minimum annual dividend is $0.75 per unit. The Series U Preferred Units can be redeemed at any time at par for cash at the option of the unitholder.

Through a consolidated subsidiary, we have authorized up to 109,1613.50% Series A Preferred Units of limited partnership interest, or the Subsidiary Series A Preferred Units, with a liquidation preference of $1,000.00 per unit. In August 2015, the Company issued 109,161 Subsidiary Series A Preferred Units in conjunction with an acquisition. The Subsidiary Series A Preferred unitholders receive annual dividends of $35.00 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Subsidiary Series A Preferred Units can be redeemed at any time, at the option of the unitholder, either for cash or are convertible on a one-for-one basis, into the Series B Preferred Units of limited partnership interest, or the Subsidiary Series B Preferred Units. The Subsidiary Series B Preferred Units can be converted at any time, at the option of the unitholder, into a number of common stock equal to 6.71348 shares of common stock for each Subsidiary Series B Preferred Unit. As of September 30, 2017, no Subsidiary Series B Preferred Units have been issued.

Below is the rollforward analysis of the activity relating to the preferred units in the Operating Partnership as of September 30, 2017 and December 31, 2016 (in thousands):

	September 30, 2017			December 31, 2016
Balance at beginning of period	$	302,010		$	282,516
Issuance of preferred units	—			22,793
Redemption of preferred units	(125		)	(3,299		)
Balance at end of period	$	301,885		$	302,010

12. Stockholders’ Equity of the Company

Common Stock

Our authorized capital stock consists of 260,000,000 shares, $0.01 par value per share, consisting of 160,000,000 shares of common stock, $0.01 par value per share, 75,000,000 shares of excess stock, at $0.01 par value per share, and 25,000,000 shares of preferred stock, par value $0.01 per share. As of September 30, 2017, 97,445,509 shares of common stock and no shares of excess stock were issued and outstanding.

In August 2016, our board of directors approved a stock repurchase plan under which we can buy up to $1.0 billion of shares of our common stock. At September 30, 2017, repurchases made under the stock repurchase plans were as follows:

Period	Total number of shares purchased	Average price paid per share	Total number of shares purchased as part of the repurchase plan or programs	Maximum approximate dollar value of shares that may yet be purchased under the plan (in millions)
First quarter 2017	982	$103.89	982	$999.9
Second quarter 2017	2,447,153	$103.41	2,448,135	$746.8
Third quarter 2017	951,866	$101.67	3,400,001	$650.0

41

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

Perpetual Preferred Stock

We have 9,200,000 shares of our 6.50% Series I Cumulative Redeemable Preferred Stock, or the Series I Preferred Stock, outstanding with a mandatory liquidation preference of $25.00 per share. The Series I Preferred stockholders receive annual dividends of $1.625 per share paid on a quarterly basis and dividends are cumulative, subject to certain provisions. We are entitled to redeem the Series I Preferred Stock at par for cash at our option. In August 2012, we received $221.9 million in net proceeds from the issuance of the Series I Preferred Stock, which were recorded net of underwriters' discount and issuance costs, and contributed the net proceeds to the Operating Partnership in exchange for 9,200,000 units of 6.50% Series I Cumulative Redeemable Preferred Units of limited partnership interest, or the Series I Preferred Units.

Dividend Reinvestment and Stock Purchase Plan

In February 2015, the Company filed a registration statement with the SEC for our dividend reinvestment and stock purchase plan, or DRSPP, which automatically became effective upon filing. The Company registered 3,500,000 shares of SL Green's common stock under the DRSPP. The DRSPP commenced on September 24, 2001.

Earnings per Share

SL Green's earnings per share for the three and nine months ended September 30, 2017 and 2016 are computed as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
Numerator	2017		2016		2017		2016
Basic Earnings:
Income attributable to SL Green common stockholders	$	38,869	$	34,252	$	58,442	$	190,930
Effect of Dilutive Securities:
Redemption of units to common shares	1,812		1,663		2,707		8,171
Diluted Earnings:
Income attributable to SL Green common stockholders	$	40,681	$	35,915	$	61,149	$	199,101

	Three Months Ended September 30,		Nine Months Ended September 30,
Denominator	2017	2016	2017	2016
Basic Shares:
Weighted average common stock outstanding	97,783	100,233	99,431	100,140
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares	4,543	4,497	4,570	4,272
Stock-based compensation plans	244	413	279	349
Diluted weighted average common stock outstanding	102,570	105,143	104,280	104,761

SL Green has excluded 1,175,708 and 1,076,695 common stock equivalents from the diluted shares outstanding for the three and nine months ended September 30, 2017, respectively, as they were anti-dilutive. SL Green has excluded 673,298 and 753,344 common stock equivalents from the diluted shares outstanding for the three and nine months ended September 30, 2016, respectively, as they were anti-dilutive.

42

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

13. Partners' Capital of the Operating Partnership

The Company is the sole general partner of the Operating Partnership and at September 30, 2017 owned 97,445,509 general and limited partnership interests in the Operating Partnership and 9,200,000 Series I Preferred Units. Partnership interests in the Operating Partnership are denominated as “common units of limited partnership interest” (also referred to as “OP Units”) or “preferred units of limited partnership interest” (also referred to as “Preferred Units”). All references to OP Units and Preferred Units outstanding exclude such units held by the Company. A holder of an OP Unit may present such OP Unit to the Operating Partnership for redemption at any time (subject to restrictions agreed upon at the issuance of OP Units to particular holders that may restrict such right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, the Operating Partnership must redeem such OP Unit in exchange for the cash equal to the then value of a share of common stock of the Company, except that the Company may, at its election, in lieu of cash redemption, acquire such OP Unit for one share of common stock. Because the number of shares of common stock outstanding at all times equals the number of OP Units that the Company owns, one share of common stock is generally the economic equivalent of one OP Unit, and the quarterly distribution that may be paid to the holder of an OP Unit equals the quarterly dividend that may be paid to the holder of a share of common stock. Each series of Preferred Units makes a distribution that is set in accordance with an amendment to the partnership agreement of the Operating Partnership. Preferred Units may also be convertible into OP Units at the election of the holder thereof or the Company, subject to the terms of such Preferred Units.

Net income (loss) allocated to the preferred unitholders and common unitholders reflects their pro rata share of net income (loss) and distributions.

Limited Partner Units

As of September 30, 2017, limited partners other than SL Green owned 4.45%, or 4,541,765 common units, of the Operating Partnership.

Preferred Units

Preferred units not owned by SL Green are further described in Note 11, “Noncontrolling Interests on the Company’s Consolidated Financial Statements - Preferred Units of Limited Partnership Interest in the Operating Partnership.”

Earnings per Unit

The Operating Partnership's earnings per unit for the three and nine months ended September 30, 2017 and 2016, respectively are computed as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
Numerator	2017		2016		2017		2016
Basic and Diluted Earnings:
Net income attributable to SLGOP common unitholders	$	40,681	$	35,915	$	61,149	$	199,101

	Three Months Ended September 30,		Nine Months Ended September 30,
Denominator	2017	2016	2017	2016
Basic units:
Weighted average common units outstanding	102,326	104,730	104,001	104,412
Effect of Dilutive Securities:
Stock-based compensation plans	244	413	279	349
Diluted weighted average common units outstanding	102,570	105,143	104,280	104,761

The Operating Partnership has excluded 1,175,708 and 1,076,695 common unit equivalents from the diluted units outstanding for the three and nine months ended September 30, 2017, respectively, as they were anti-dilutive. The Operating Partnership has excluded 673,298 and 753,344 common unit equivalents from the diluted units outstanding for the three and nine months ended September 30, 2016, respectively, as they were anti-dilutive.

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SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

14. Share-based Compensation

We have stock-based employee and director compensation plans. Our employees are compensated through the Operating Partnership. Under each plan, whenever the Company issues common or preferred stock, the Operating Partnership issues an equivalent number of units of limited partnership interest of a corresponding class to the Company.

Fourth Amended and Restated 2005 Stock Option and Incentive Plan

The Fourth Amended and Restated 2005 Stock Option and Incentive Plan, or the 2005 Plan, was approved by the Company's board of directors in April 2016 and its stockholders in June 2016 at the Company's annual meeting of stockholders. The 2005 Plan authorizes the issuance of stock options, stock appreciation rights, unrestricted and restricted stock, phantom shares, dividend equivalent rights, cash-based awards and other equity-based awards. Subject to adjustments upon certain corporate transactions or events, awards with respect to up to a maximum of 27,030,000 fungible units may be granted under the 2005 Plan. Currently, different types of awards count against the limit on the number of fungible units differently, with (1) full-value awards (i.e., those that deliver the full value of the award upon vesting, such as restricted stock) granted after the effective date of the Fourth Amendment 2005 Plan counting as 3.74 Fungible Units per share subject to such awards, (2) stock options, stock appreciation rights and other awards that do not deliver full value and expire five years from the date of grant counting as 0.73 fungible units per share subject to such awards, and (3) all other awards (e.g., ten-year stock options) counting as 1.0 fungible units per share subject to such awards. Awards granted under the 2005 Plan prior to the approval of the fourth amendment and restatement in June 2016 continue to count against the fungible unit limit based on the ratios that were in effect at the time such awards were granted, which may be different than the current ratios. As a result, depending on the types of awards issued, the 2005 Plan may result in the issuance of more or less than 27,030,000 shares. If a stock option or other award granted under the 2005 Plan expires or terminates, the common stock subject to any portion of the award that expires or terminates without having been exercised or paid, as the case may be, will again become available for the issuance of additional awards. Shares of SL Green's common stock distributed under the 2005 Plan may be treasury shares or authorized but unissued shares. Currently, unless the 2005 Plan has been previously terminated by the Company's board of directors, new awards may be granted under the 2005 Plan until June 2, 2026, which is the tenth anniversary of the date that the 2005 Plan was most recently approved by the Company's stockholders. As of September 30, 2017, 8.7 million fungible units were available for issuance under the 2005 Plan after reserving for shares underlying outstanding restricted stock units, phantom stock units granted pursuant to our Non-Employee Directors' Deferral Program and LTIP Units, including, among others, outstanding LTIP Units issued under our 2014 Outperformance Plan.

Options are granted under the plan with an exercise price at the fair market value of the Company's common stock on the date of grant and, subject to employment, generally expire five or ten years from the date of grant, are not transferable other than on death, and generally vest in one to five years commencing one year from the date of grant. We have also granted Class O LTIP Units, which are a class of LTIP Units in the Operating Partnership structured to provide economics similar to those of stock options. Class O LTIP Units, once vested, may be converted, at the election of the holder, into a number of common units of the Operating Partnership per Class O LTIP Unit determined by the increase in value of a share of the Company’s common stock at the time of conversion over a participation threshold, which equals the fair market value of a share of the Company’s common stock at the time of grant. Class O LTIP Units are entitled to distributions, subject to vesting, equal per unit to 10% of the per unit distributions paid with respect to the common units of the Operating Partnership.

The fair value of each stock option or LTIP Unit granted is estimated on the date of grant using the Black-Scholes option pricing model based on historical information with the following weighted average assumptions for grants during the nine months ended September 30, 2017 and the year ended December 31, 2016.

	September 30, 2017		December 31, 2016
Dividend yield	2.50	%	2.37	%
Expected life	4.4 years		3.7 years
Risk-free interest rate	1.73	%	1.57	%
Expected stock price volatility	28.21	%	26.76	%

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SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

A summary of the status of the Company's stock options as of September 30, 2017 and December 31, 2016, and changes during the nine months ended September 30, 2017 and year ended December 31, 2016 are as follows:

	September 30, 2017					December 31, 2016
	Options Outstanding			Weighted Average Exercise Price		Options Outstanding			Weighted Average Exercise Price
Balance at beginning of period	$	1,737,213		$	98.44	$	1,595,007		$	95.52
Granted	171,000			105.70		445,100			105.86
Exercised	(146,277		)	84.02		(192,875		)	76.90
Lapsed or cancelled	(65,300		)	122.30		(110,019		)	123.86
Balance at end of period	$	1,696,636		$	99.50	$	1,737,213		$	98.44
Options exercisable at end of period	939,485			$	91.71	748,617			$	87.72
Weighted average fair value of options granted during the period	$	3,775,639				$	8,363,036

All options were granted with strike prices ranging from $20.67 to $128.82. The remaining weighted average contractual life of the options outstanding was 3.6 years and the remaining average contractual life of the options exercisable was 2.8 years.

During the three and nine months ended September 30, 2017, we recognized compensation expense for these options of $2.0 million and $5.9 million, respectively. During the three and nine months ended September 30, 2016, we recognized compensation expense for these options of $2.5 million and $6.4 million, respectively.

As of September 30, 2017, there was $10.6 million of total unrecognized compensation cost related to unvested stock options, which is expected to be recognized over a weighted average period of 1.7 years.

Stock-based Compensation

Effective January 1, 1999, the Company implemented a deferred compensation plan, or the Deferred Plan, where shares issued under the Deferred Plan were granted to certain employees, including certain of our executives and vesting will occur annually upon the completion of a service period or our meeting established financial performance criteria. Annual vesting occurs at rates ranging from 15% to 35% once performance criteria are reached.

A summary of the Company's restricted stock as of September 30, 2017 and December 31, 2016 and charges during the nine months ended September 30, 2017 and the year ended December 31, 2016, are as follows:

	September 30, 2017		December 31, 2016
Balance at beginning of period	3,202,031		3,137,881
Granted	300		98,800
Cancelled	—		(34,650		)
Balance at end of period	3,202,331		3,202,031
Vested during the period	86,736		83,822
Compensation expense recorded	$	7,277,054	$	7,153,966
Weighted average fair value of restricted stock granted during the period	$	30,813	$	10,650,077

The fair value of restricted stock that vested during the nine months ended September 30, 2017 and the year ended December 31, 2016 was $8.4 million and $7.6 million, respectively. As of September 30, 2017 there was $13.7 million of total unrecognized compensation cost related to restricted stock, which is expected to be recognized over a weighted average period of 1.7 years.

For the three and nine months ended September 30, 2017, $1.4 million and $5.0 million, respectively, was capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options. For the three and nine months ended September 30, 2016, $1.5 million and $4.4 million, respectively, was capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options.

We have granted LTIP Units, which include bonus, time-based and performance based awards, with a fair value of $20.5 million and $34.9 million as of September 30, 2017 and December 31, 2016, respectively. The grant date fair value of the LTIP Unit awards was calculated in accordance with ASC 718. A third party consultant determined the fair value of the LTIP Units to

45

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

have a discount from SL Green's common stock price. The discount was calculated by considering the inherent uncertainty that the LTIP Units will reach parity with other common partnership units and the illiquidity due to transfer restrictions. As of September 30, 2017, there was $7.1 million of total unrecognized compensation expense related to the time-based and performance based awards, which is expected to be recognized over a weighted average period of 1.2 years.

During the three and nine months ended September 30, 2017, we recorded compensation expense related to bonus, time-based and performance based awards of $2.5 million and $15.1 million, respectively. During the three and nine months ended September 30, 2016, we recorded compensation expense related to bonus, time-based and performance based awards of $2.3 million and $15.1 million, respectively.

2014 Outperformance Plan

In August 2014, the compensation committee of the Company's board of directors approved the general terms of the SL Green Realty Corp. 2014 Outperformance Plan, or the 2014 Outperformance Plan. Participants in the 2014 Outperformance Plan may earn, in the aggregate, up to 610,000 LTIP Units in our Operating Partnership based on our total return to stockholders for the three-year period beginning September 1, 2014. Under the 2014 Outperformance Plan, two-thirds of the LTIP Units may be earned based on the Company’s absolute total return to stockholders and one-third of the LTIP Units may be earned based on relative total return to stockholders compared to the constituents of the MSCI REIT Index. Awards earned based on absolute total return to stockholders will be determined independently of awards earned based on relative total return to stockholders. In the event the Company’s performance reaches either threshold before the end of the three-year performance period, a pro-rata portion of the maximum award may be earned. For each component, if the Company’s performance reaches the maximum threshold beginning with the 19th month of the performance period, participants will earn one-third of the maximum award that may be earned for that component. If the Company’s performance reaches the maximum threshold during the third year of the performance period for a component, participants will earn two-thirds (or an additional one-third) of the maximum award that may be earned for that component. LTIP Units earned under the 2014 Outperformance Plan will be subject to continued vesting requirements, with 50% of any awards earned vesting on August 31, 2017 and the remaining 50% vesting on August 31, 2018, subject to continued employment with us through such dates. Participants will not be entitled to distributions with respect to LTIP Units granted under the 2014 Outperformance Plan unless and until they are earned. If LTIP Units are earned, each participant will also be entitled to the distributions that would have been paid had the number of earned LTIP Units been issued at the beginning of the performance period, with such distributions being paid in the form of cash or additional LTIP Units. Thereafter, distributions will be paid currently with respect to all earned LTIP Units, whether vested or unvested.

The cost of the 2014 Outperformance Plan ($29.2 million, subject to forfeitures), based on the portion of the 2014 Outperformance Plan granted as of September 30, 2017, will be amortized into earnings through the final vesting period. We recorded compensation expense of $1.9 million and $8.2 million for the three and nine months ended September 30, 2017, respectively, related to the 2014 Outperformance Plan. We recorded compensation expense of $1.8 million and $6.6 million for the three and nine months ended September 30, 2016, respectively, related to the 2014 Outperformance Plan.

Deferred Compensation Plan for Directors

Under our Non-Employee Director's Deferral Program, which commenced July 2004, the Company's non-employee directors may elect to defer up to 100% of their annual retainer fee, chairman fees, meeting fees and annual stock grant. Unless otherwise elected by a participant, fees deferred under the program shall be credited in the form of phantom stock units. The program provides that a director's phantom stock units generally will be settled in an equal number of shares of common stock upon the earlier of (i) the January 1 coincident with or the next following such director's termination of service from the Board of Directors or (ii) a change in control by us, as defined by the program. Phantom stock units are credited to each non-employee director quarterly using the closing price of SL Green's common stock on the first business day of the respective quarter. Each participating non-employee director is also credited with dividend equivalents or phantom stock units based on the dividend rate for each quarter, which are either paid in cash currently or credited to the director’s account as additional phantom stock units.

During the nine months ended September 30, 2017, 11,510 phantom stock units and 9,171 shares of common stock were issued to our board of directors. We recorded compensation expense of $0.1 million and $2.2 million during the three and nine months ended September 30, 2017, respectively, related to the Deferred Compensation Plan. We recorded compensation expense of $0.1 million and $1.9 million during the three and nine months ended September 30, 2016, respectively, related to the Deferred Compensation Plan.

As of September 30, 2017, there were 98,637 phantom stock units outstanding pursuant to our Non-Employee Director's Deferral Program.

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SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

Employee Stock Purchase Plan

In 2007, the Company's board of directors adopted the 2008 Employee Stock Purchase Plan, or ESPP, to encourage our employees to increase their efforts to make our business more successful by providing equity-based incentives to eligible employees. The ESPP is intended to qualify as an "employee stock purchase plan" under Section 423 of the Code, and has been adopted by the board to enable our eligible employees to purchase the Company's shares of common stock through payroll deductions. The ESPP became effective on January 1, 2008 with a maximum of 500,000 shares of the common stock available for issuance, subject to adjustment upon a merger, reorganization, stock split or other similar corporate change. The Company filed a registration statement on Form S-8 with the SEC with respect to the ESPP. The common stock is offered for purchase through a series of successive offering periods. Each offering period will be three months in duration and will begin on the first day of each calendar quarter, with the first offering period having commenced on January 1, 2008. The ESPP provides for eligible employees to purchase the common stock at a purchase price equal to 85% of the lesser of (1) the market value of the common stock on the first day of the offering period or (2) the market value of the common stock on the last day of the offering period. The ESPP was approved by our stockholders at our 2008 annual meeting of stockholders. As of September 30, 2017, 101,882 shares of SL Green's common stock had been issued under the ESPP.

15. Accumulated Other Comprehensive Income

The following tables set forth the changes in accumulated other comprehensive income (loss) by component as of September 30, 2017 (in thousands):

	Net unrealized gain on derivative instruments (1)			SL Green’s share of joint venture net unrealized gain on derivative instruments (2)			Net unrealized gain on marketable securities			Total
Balance at December 31, 2016	$	12,596		$	4,021		$	5,520		$	22,137
Other comprehensive (loss) before reclassifications	(4,669		)	(947		)	(1,133		)	(6,749		)
Amounts reclassified from accumulated other comprehensive income	1,336			591			(3,130		)	(1,203		)
Balance at September 30, 2017	$	9,263		$	3,665		$	1,257		$	14,185

(1) Amount reclassified from accumulated other comprehensive income (loss) is included in interest expense in the respective consolidated statements of operations. As of September 30, 2017 and December 31, 2016, the deferred net losses from these terminated hedges, which is included in accumulated other comprehensive loss relating to net unrealized loss on derivative instrument, was $3.7 million and $7.1 million, respectively.

(2) Amount reclassified from accumulated other comprehensive income (loss) is included in equity in net income from unconsolidated joint ventures in the respective consolidated statements of operations.

16. Fair Value Measurements

We are required to disclose fair value information with regard to our financial instruments, whether or not recognized in the consolidated balance sheets, for which it is practical to estimate fair value. The FASB guidance defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants on the measurement date. We measure and/or disclose the estimated fair value of financial assets and liabilities based on a hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity and the reporting entity’s own assumptions about market participant assumptions. This hierarchy consists of three broad levels: Level 1 - quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date; Level 2 - inputs other than quoted prices included within Level 1, that are observable for the asset or liability, either directly or indirectly; and Level 3 - unobservable inputs for the asset or liability that are used when little or no market data is available. We follow this hierarchy for our assets and liabilities measured at fair value on a recurring and nonrecurring basis. In instances in which the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level of input that is significant to the fair value measurement in its entirety. Our assessment of the significance of the particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability.

The following tables set forth the assets and liabilities that we measure at fair value on a recurring and non-recurring basis by their levels in the fair value hierarchy at September 30, 2017 and December 31, 2016 (in thousands):

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SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

	September 30, 2017
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities	$	28,802	$	—	$	28,802	$	—
Interest rate cap and swap agreements (included in other assets)	$	13,727	$	—	$	13,727	$	—

	December 31, 2016
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities	$	85,110	$	48,315	$	36,795	$	—
Interest rate cap and swap agreements (included in other assets)	$	21,090	$	—	$	21,090	$	—
Liabilities:
Interest rate cap and swap agreements (included in accrued interest payable and other liabilities)	$	1	$	—	$	1	$	—

We determine other than temporary impairment in real estate investments and debt and preferred equity investments, including intangibles primarily utilizing cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, as well as sales comparison approach, which utilizes comparable sales, listings and sales contracts. All of which are classified as Level 3 inputs.

As of September 30, 2017, we held notes receivable totaling $250.0 million, which were purchased at par, and were in maturity default at the time of acquisition. In August 2017, the Company determined that it was probable that the loans would not be repaid in full and therefore, the loans were put on non-accrual status. The Company has initiated proceedings to foreclose on the property, and expects to take control of the property unless the buyer is able to repay the principal and interest, including default interest and fees, on the notes receivable in full prior to the completion of the foreclosure process. We believe the collateral value is sufficient to recover the carrying amounts of the notes receivable.

The marketable securities classified as Level 1 were derived from quoted prices in active markets. The valuation technique used to measure the fair value of the marketable securities classified as Level 2 were valued based on quoted market prices or model driven valuations using the significant inputs derived from or corroborated by observable market data. Marketable securities in an unrealized loss position are not considered to be other than temporarily impaired. We do not intend to sell these securities and it is not more likely than not that we will be required to sell the investments before recovery of their amortized cost bases.

The fair value of derivative instruments is based on current market data received from financial sources that trade such instruments and are based on prevailing market data and derived from third party proprietary models based on well-recognized financial principles and reasonable estimates about relevant future market conditions, which are classified as Level 2 inputs.

The financial assets and liabilities that are not measured at fair value on our consolidated balance sheets include cash and cash equivalents, restricted cash, accounts receivable, accounts payable and accrued expenses, debt and preferred equity investments, mortgages and other loans payable and other secured and unsecured debt. The carrying amount of cash and cash equivalents, restricted cash, accounts receivable, and accounts payable and accrued expenses reported in our consolidated balance sheets approximates fair value due to the short term nature of these instruments. The fair value of debt and preferred equity investments, which is classified as Level 3, is estimated by discounting the future cash flows using current interest rates at which similar loans with the same maturities would be made to borrowers with similar credit ratings. The fair value of borrowings, which is classified as Level 3, is estimated by discounting the contractual cash flows of each debt instrument to their present value using adjusted market interest rates, which is provided by a third-party specialist.

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SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

The following table provides the carrying value and fair value of these financial instruments as of September 30, 2017 and December 31, 2016 (in thousands):

	September 30, 2017				December 31, 2016
	Carrying Value (1)		Fair Value		Carrying Value (1)		Fair Value
Debt and preferred equity investments	$	2,020,739	(2)		$	1,640,412	(2)
Fixed rate debt	$	5,154,810	$	5,398,870	$	5,452,084	$	5,722,494
Variable rate debt	1,321,813		1,314,223		1,105,585		1,110,110
	$	6,476,623	$	6,713,093	$	6,557,669	$	6,832,604

(1) Amounts exclude net deferred financing costs.

(2) At September 30, 2017, debt and preferred equity investments had an estimated fair value ranging between $2.0 billion and $2.2 billion. At December 31, 2016, debt and preferred equity investments had an estimated fair value ranging between $1.6 billion and $1.8 billion.

Disclosure about fair value of financial instruments was based on pertinent information available to us as of September 30, 2017 and December 31, 2016. Although we are not aware of any factors that would significantly affect the reasonable fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since that date and current estimates of fair value may differ significantly from the amounts presented herein.

17. Financial Instruments: Derivatives and Hedging

In the normal course of business, we use a variety of commonly used derivative instruments, such as interest rate swaps, caps, collar and floors, to manage, or hedge interest rate risk. We hedge our exposure to variability in future cash flows for forecasted transactions in addition to anticipated future interest payments on existing debt. We recognize all derivatives on the balance sheets at fair value. Derivatives that are not hedges are adjusted to fair value through earnings. If a derivative is a hedge, depending on the nature of the hedge, changes in the fair value of the derivative will either be offset against the change in fair value of the hedge asset, liability, or firm commitment through earnings, or recognized in other comprehensive income until the hedged item is recognized in earnings. The ineffective portion of a derivative's change in fair value will be immediately recognized in earnings. Reported net income and equity may increase or decrease prospectively, depending on future levels of interest rates and other variables affecting the fair values of derivative instruments and hedged items, but will have no effect on cash flows. Currently, all of our designated derivative instruments are effective hedging instruments.

The following table summarizes the notional value at inception and fair value of our consolidated derivative financial instruments at September 30, 2017 based on Level 2 information. The notional value is an indication of the extent of our involvement in these instruments at that time, but does not represent exposure to credit, interest rate or market risks (amounts in thousands).

	Notional Value		Strike Rate		Effective Date	Expiration Date	Balance Sheet Location	Fair Value
Interest Rate Swap	$	200,000	0.938	%	October 2014	December 2017	Other Assets	$	105
Interest Rate Swap	150,000		0.940	%	October 2014	December 2017	Other Assets	78
Interest Rate Swap	150,000		0.940	%	October 2014	December 2017	Other Assets	78
Interest Rate Cap	137,500		4.000	%	September 2017	September 2019	Other Assets	4
Interest Rate Swap	200,000		1.131	%	July 2016	July 2023	Other Assets	8,998
Interest Rate Swap	100,000		1.161	%	July 2016	July 2023	Other Assets	4,335
Interest Rate Swap	100,000		2.287	%	November 2017	November 2027	Other Assets	129
								$	13,727

During both the three and nine months ended September 30, 2017, we recorded a loss on the changes in the fair value of $0.1 million, which is included in interest expense on the consolidated statements of operations. During the three and nine months ended September 30, 2016, we recorded a $0.1 million loss and a $0.5 million gain, respectively, on the changes in the fair value, which is included in interest expense on the consolidated statements of operations.

The Company has agreements with each of its derivative counterparties that contain a provision where if the Company either defaults or is capable of being declared in default on any of its indebtedness, then the Company could also be declared in default

49

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

on its derivative obligations. As of September 30, 2017, the fair value of derivatives in a net liability position including accrued interest but excluding any adjustment for nonperformance risk related to these agreements was zero. As of September 30, 2017, the Company has not posted any collateral related to these agreements and was not in breach of any agreement provisions. If the Company had breached any of these provisions, it could have been required to settle its obligations under the agreements at their aggregate termination value of zero at September 30, 2017.

Gains and losses on terminated hedges are included in accumulated other comprehensive loss, and are recognized into earnings over the term of the related mortgage obligation. Over time, the realized and unrealized gains and losses held in accumulated other comprehensive loss will be reclassified into earnings as an adjustment to interest expense in the same periods in which the hedged interest payments affect earnings. We estimate that $0.8 million of the current balance held in accumulated other comprehensive loss will be reclassified into interest expense and $0.3 million of the portion related to our share of joint venture accumulated other comprehensive loss will be reclassified into equity in net income from unconsolidated joint ventures within the next 12 months.

The following table presents the effect of our derivative financial instruments and our share of our joint ventures' derivative financial instruments that are designated and qualify as hedging instruments on the consolidated statements of operations for the three months ended September 30, 2017 and 2016, respectively (in thousands):

	Amount of (Loss) Recognized in Other Comprehensive Loss (Effective Portion)						Location of (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income	Amount of Loss  Reclassified from Accumulated Other Comprehensive Loss  into Income (Effective Portion)				Location of (Loss) Recognized in Income on Derivative	Amount of (Loss) Gain Recognized into Income (Ineffective Portion)
	Three Months Ended September 30,							Three Months Ended September 30,					Three Months Ended September 30,
Derivative	2017			2016				2017		2016			2017			2016
Interest Rate Swaps/Caps	$	(304	)	$	(7	)	Interest expense	$	85	$	1,442	Interest expense	$	4		$	—
Share of unconsolidated joint ventures' derivative instruments	(290		)	(222		)	Equity in net income from unconsolidated joint ventures	185		547		Equity in net income from unconsolidated joint ventures	(48		)	830
	$	(594	)	$	(229	)		$	270	$	1,989		$	(44	)	$	830

The following table presents the effect of our derivative financial instruments and our share of our joint ventures' derivative financial instruments that are designated and qualify as hedging instruments on the consolidated statements of operations for the nine months ended September 30, 2017 and 2016, respectively (in thousands):

	Amount of (Loss) Recognized in Other Comprehensive Loss (Effective Portion)						Location of (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income	Amount of Loss  Reclassified from Accumulated Other Comprehensive Loss  into Income (Effective Portion)				Location of (Loss) Recognized in Income on Derivative	Amount of (Loss) Recognized into Income (Ineffective Portion)
	Nine Months Ended September 30,							Nine Months Ended September 30,					Nine Months Ended September 30,
Derivative	2017			2016				2017		2016			2017			2016
Interest Rate Swaps/Caps	$	(5,477	)	$	(8,112	)	Interest expense	$	1,583	$	8,073	Interest expense	$	(4	)	$	(38	)
Share of unconsolidated joint ventures' derivative instruments	(1,277		)	(5,992		)	Equity in net income from unconsolidated joint ventures	876		1,465		Equity in net income from unconsolidated joint ventures	(109		)	(206		)
	$	(6,754	)	$	(14,104	)		$	2,459	$	9,538		$	(113	)	$	(244	)

50

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

18. Commitments and Contingencies

Legal Proceedings

As of September 30, 2017, the Company and the Operating Partnership were not involved in any material litigation nor, to management's knowledge, was any material litigation threatened against us or our portfolio which if adversely determined could have a material adverse impact on us.

Environmental Matters

Our management believes that the properties are in compliance in all material respects with applicable Federal, state and local ordinances and regulations regarding environmental issues. Management is not aware of any environmental liability that it believes would have a materially adverse impact on our financial position, results of operations or cash flows. Management is unaware of any instances in which it would incur significant environmental cost if any of our properties were sold.

Capital and Ground Leases Arrangements

The following is a schedule of future minimum lease payments under capital leases and non-cancellable operating leases with initial terms in excess of one year as of September 30, 2017 (in thousands):

	Capital lease			Non-cancellable operating leases
Remaining 2017	$	597		$	7,763
2018	2,387			31,049
2019	2,411			31,066
2020	2,620			31,436
2021	2,794			31,628
Thereafter	822,688			732,724
Total minimum lease payments	$	833,497		$	865,666
Amount representing interest	(790,837		)
Capital lease obligations	$	42,660

19. Segment Information

The Company is a REIT with in-house capabilities in commercial and residential property management, acquisitions and dispositions, financing, development and redevelopment, construction and leasing in the New York Metropolitan area, and has two reportable segments, real estate and debt and preferred equity investments. We evaluate real estate performance and allocate resources based on earnings contribution to income from continuing operations.

The primary sources of revenue are generated from tenant rents and escalations and reimbursement revenue. Real estate property operating expenses consist primarily of security, maintenance, utility costs, insurance, real estate taxes and ground rent expense (at certain applicable properties). See Note 5, "Debt and Preferred Equity Investments," for additional details on our debt and preferred equity investments.

Selected consolidated results of operations for the three and nine months ended September 30, 2017 and 2016, and selected asset information as of September 30, 2017 and December 31, 2016, regarding our operating segments are as follows (in thousands):

51

SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

September 30, 2017

(unaudited)

	Real Estate Segment			Debt and Preferred Equity Segment		Total Company
Total revenues
Three months ended:
September 30, 2017	$	326,780		$	47,820	$	374,600
September 30, 2016	341,285			75,396		416,681
Nine months ended:
September 30, 2017	1,001,390			148,741		1,150,131
September 30, 2016	1,315,392			174,347		1,489,739
Net income (loss) before 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, and gain on sale of investment in marketable securities
Three months ended:
September 30, 2017	$	4,873		$	39,892	$	44,765
September 30, 2016	(32,731		)	75,452		42,721
Nine months ended:
September 30, 2017	(504		)	132,402		131,898
September 30, 2016	(187,222		)	168,295		(18,927		)
Total assets
As of:
September 30, 2017	$	12,939,363		$	2,170,507	$	15,109,870
December 31, 2016	13,868,672			1,989,115		15,857,787

Income from continuing operations represents total revenues less total expenses for the real estate segment and total investment income less allocated interest expense for the debt and preferred equity segment. Interest costs for the debt and preferred equity segment includes actual costs incurred for borrowings on the 2016 MRA and 2017 MRA. Interest is imputed on the investments that do not collateralize the 2016 MRA or 2017 MRA using our corporate borrowing cost. We also allocate loan loss reserves, net of recoveries, and transaction related costs to the debt and preferred equity segment. We do not allocate marketing, general and administrative expenses to the debt and preferred equity segment since the use of personnel and resources is dependent on transaction volume between the two segments and varies period over period. In addition, we base performance on the individual segments prior to allocating marketing, general and administrative expenses. For the three and nine months ended September 30, 2017, marketing, general and administrative expenses totaled $24.0 million, and $72.4 million respectively. For the three and nine months ended September 30, 2016, marketing, general and administrative expenses totaled $25.5 million and $74.0 million, respectively. All other expenses, except interest, relate entirely to the real estate assets.

There were no transactions between the above two segments.

The table below reconciles income from continuing operations to net income for the three and nine months ended September 30, 2017 and 2016 (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017			2016
Net income (loss) before 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, and gain on sale of investment in marketable securities	$	44,765	$	42,721	$	131,898		$	(18,927	)
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	—		397		(3,256		)	210,750
Depreciable real estate reserves	—		—		(85,336		)	(10,387		)
Gain (loss) on sale of investment in marketable securities	—		—		3,262			(83		)
Net income	$	45,795	$	43,343	$	62,734		$	224,941

52

ITEM 2.    MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Overview

SL Green Realty Corp., which is referred to as SL Green or the Company, a Maryland corporation, and SL Green Operating Partnership, L.P., which is referred to as SLGOP or the Operating Partnership, a Delaware limited partnership, were formed in June 1997 for the purpose of combining the commercial real estate business of S.L. Green Properties, Inc. and its affiliated partnerships and entities. The Company is a self-managed real estate investment trust, or REIT, with in-house capabilities in commercial and residential property management, acquisitions and dispositions, financing, development and redevelopment, construction and leasing. Unless the context requires otherwise, all references to "we," "our" and "us" means the Company and all entities owned or controlled by the Company, including the Operating Partnership.

Reckson Associates Realty Corp., or Reckson, and Reckson Operating Partnership, L.P. or ROP, are wholly-owned subsidiaries of the SL Green Realty Corp.

The following discussion related to our consolidated financial statements should be read in conjunction with the financial statements appearing in this Quarterly Report of this Form 10-Q and in Item 8 of our Annual Report on Form 10-K for the year ended December 31, 2016.

As of September 30, 2017, we owned the following interests in properties in the New York Metropolitan area, primarily in midtown Manhattan. Our investments in the New York Metropolitan area also include investments in Brooklyn, Long Island, Westchester County, Connecticut and New Jersey, which are collectively known as the Suburban properties:

		Consolidated			Unconsolidated		Total
Location	Property Type	Number of Properties		Approximate Square Feet (unaudited)	Number of Properties	Approximate Square Feet (unaudited)	Number of Properties	Approximate Square Feet (unaudited)	Weighted Average Occupancy(1) (unaudited)
Commercial:
Manhattan	Office	24		16,054,606	7	6,558,139	31	22,612,745	93.4	%
	Retail	4	(2)	302,583	9	347,970	13	650,553	94.5	%
	Development/Redevelopment	7		158,985	4	770,514	11	929,499	59.9	%
	Fee Interest	1		176,530	1	—	2	176,530	100.0	%
		36		16,692,704	21	7,676,623	57	24,369,327	92.2	%
Suburban	Office	22		3,608,800	2	640,000	24	4,248,800	83.1	%
	Retail	1		52,000	—	—	1	52,000	100.0	%
	Development/Redevelopment	1		1,000	1	—	2	1,000	100.0	%
		24		3,661,800	3	640,000	27	4,301,800	83.3	%
Total commercial properties		60		20,354,504	24	8,316,623	84	28,671,127	90.8	%
Residential:
Manhattan	Residential	3	(2)	472,105	12	2,656,856	15	3,128,961	86.4	%
Suburban	Residential	—		—	—	—	—	—	—	%
Total residential properties		3		472,105	12	2,656,856	15	3,128,961	86.4	%
Total portfolio(2)(3)		63		20,826,609	36	10,973,479	99	31,800,088	90.4	%

(1) The weighted average occupancy for commercial properties represents the total occupied square feet divided by total square footage at acquisition. The weighted average occupancy for residential properties represents the total occupied units divided by total available units.

(2) As of September 30, 2017, we owned a building at 315 West 33rd Street, also known as The Olivia, that was comprised of approximately 270,132 square feet (unaudited) of retail space and approximately 222,855 square feet (unaudited) of residential space. For the purpose of this report, we have included this building in the number of retail properties we own. However, we have included only the retail square footage in the retail approximate square footage, and have listed the balance of the square footage as residential square footage.

(3) Includes the properties at 16 Court Street in Brooklyn, New York, and 125 Chubb Avenue in Lyndhurst, New Jersey which are classified as held for sale at September 30, 2017. The sales closed in October 2017.

As of September 30, 2017, we also managed an approximately 336,000 square foot (unaudited) office building owned by a third party and held debt and preferred equity investments with a book value of $2.2 billion, including $0.1 billion of debt and preferred equity investments and other financing receivables that are included in other balance sheet line items other than the Debt and Preferred Equity Investments line item.

53

Critical Accounting Policies

Refer to the 2016 Annual Report on Form 10-K of the Company and the Operating Partnership for a discussion of our critical accounting policies, which include investment in commercial real estate properties, investment in unconsolidated joint ventures, revenue recognition, allowance for doubtful accounts, reserve for possible credit losses and derivative instruments. There have been no changes to these accounting policies during the three and nine months ended September 30, 2017.

54

Reconciliation of Net Income to Same-Store Operating Income

The Company presents Same-Store Operating Income because the Company believes that this measure, when taken together with the corresponding GAAP financial measures and our reconciliation, provides investors with meaningful information regarding the operating performance of properties. When operating performance is compared across multiple periods, the investor is provided with information not immediately apparent from net income that is determined in accordance with GAAP. Same-Store Operating Income provides information on trends in the revenue generated and expenses incurred in operating our properties, unaffected by the cost of leverage, depreciation, amortization, and other net income components. The Company uses this metric internally as a performance measure. This measure is not an alternative to net income (determined in accordance with GAAP) and same-store performance should not be considered an alternative to GAAP net income performance.

For properties owned since January 1, 2016 and still owned and operated at September 30, 2017, Same-Store Operating Income is determined as follows (in millions):

	Three months ended						Nine months ended
	September 30,						September 30,
(in millions)	2017			2016			2017			2016
Net income	$	45.8		$	43.3		$	62.7		$	224.9
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	(1.0		)	(0.2		)	(16.2		)	(43.6		)
Loss (gain) on sale of real estate, net	—			(0.4		)	3.3			(210.8		)
Depreciable real estate reserves	—			—			85.3			10.4
Loss on sale of investment in marketable securities	—			—			(3.3		)	0.1
Depreciation and amortization	91.7			112.7			318.9			717.0
Interest expense, net of interest income	65.6			72.6			196.1			256.3
Amortization of deferred financing costs	4.0			4.8			12.2			20.2
Operating income	206.1			232.8			659.0			974.5
Less: Operating income from other properties/affiliates	(31.9		)	(72.8		)	(129.5		)	(465.5		)
Same-store operating income	$	174.2		$	160.0		$	529.5		$	509.0

Results of Operations

Comparison of the three months ended September 30, 2017 to the three months ended September 30, 2016

The following comparison for the three months ended September 30, 2017, or 2017, to the three months ended September 30, 2016, or 2016, makes reference to the effect of the following: 

i. “Same-Store Properties,” which represents all operating properties owned by us at January 1, 2016 and still owned by us in the same manner at September 30, 2017 (Same-Store Properties totaled52 of our 63 consolidated operating properties),

ii. “Acquisition Properties,” which represents all properties or interests in properties acquired in 2017 and 2016 and all non-Same-Store Properties, including properties that are under development, redevelopment or were deconsolidated during the period,

iii. "Disposed Properties" which represents all properties or interests in properties sold or partially sold in 2017 and 2016, and

iv. “Other,” which represents corporate level items not allocable to specific properties, as well as the Service Corporation and eEmerge Inc.

55

	Same-Store									Disposed					Other				Consolidated
(in millions)	2017		2016		$ Change			% Change		2017			2016		2017		2016		2017			2016			$ Change			% Change
Rental revenue	$	270.9	$	248.8	$	22.1		8.9	%	$	0.3		$	26.7	$	3.6	$	6.0	$	274.8		$	281.5		$	(6.7	)	(2.4	)%
Escalation and reimbursement	44.4		50.2		(5.8		)	(11.6	)%	—			2.5		0.3		0.4		44.7			53.1			(8.4		)	(15.8	)%
Investment income	—		—		—			—	%	—			—		47.8		75.4		47.8			75.4			(27.6		)	(36.6	)%
Other income	1.8		1.7		0.1			5.9	%	—			0.1		5.5		4.9		7.3			6.7			0.6			9.0	%
Total revenues	317.1		300.7		16.4			5.5	%	0.3			29.3		57.2		86.7		374.6			416.7			(42.1		)	(10.1	)%
Property operating expenses	142.9		140.7		2.2			1.6	%	0.4			7.4		5.1		3.8		148.4			151.9			(3.5		)	(2.3	)%
Transaction related costs	—		—		—			—	%	—			—		0.2		2.6		0.2			2.6			(2.4		)	(92.3	)%
Marketing, general and administrative	—		—		—			—	%	—			—		24.0		25.5		24.0			25.5			(1.5		)	(5.9	)%
	142.9		140.7		2.2			1.6	%	0.4			7.4		29.3		31.9		172.6			180.0			(7.4		)	(4.1	)%
Operating income before equity in net income from unconsolidated joint ventures	$	174.2	$	160.0	$	14.2		8.9	%	$	(0.1	)	$	21.9	$	27.9	$	54.8	$	202.0		$	236.7		$	(34.7	)	(14.7	)%
Other income (expenses):
Interest expense and amortization of deferred financing costs, net of interest income																			(69.6		)	(77.4		)	7.8			(10.1	)%
Depreciation and amortization																			(91.7		)	(112.7		)	21.0			(18.6	)%
Equity in net income (loss) from unconsolidated joint ventures																			4.1			(4.0		)	8.1			(202.5	)%
Equity in net gain on sale of interest in unconsolidated joint venture/real estate																			1.0			0.2			0.8			400.0	%
Gain (loss) on sale of real estate, net																			—			0.4			(0.4		)	(100.0	)%
Net income																			$	45.8		$	43.2		$	2.6		6.0	%

Rental, Escalation and Reimbursement Revenues

Rental revenues decreased primarily as a result of Disposed Properties ($26.4 million), which included the effect of the partial sale and deconsolidation of 11 Madison Avenue in the third quarter of 2016 ($16.7 million), partially offset by increased rental revenue at our Same-Store Properties ($22.1 million). Increased rental revenue at our Same-Store Properties was primarily driven by 1515 Broadway which, in 2016, recognized accounting write-offs ($17.4 million) related to the space previously leased to Aeropostale following the tenant's bankruptcy.

Escalation and reimbursement revenue decreased primarily as a result of Disposed Properties ($2.5 million) and lower recoveries at our Same-Store properties ($5.8 million).

The following table presents a summary of the commenced leasing activity for the three months ended September 30, 2017 in our Manhattan and Suburban portfolio:

56

	Useable SF	Rentable SF	New Cash Rent (per rentable SF) (1)		Prev. Escalated Rent (per rentable SF) (2)		TI/LC per rentable SF		Free Rent (in months)	Average Lease Term (in years)
Manhattan
Space available at beginning of the period	1,553,301
Space which became available during the period (3)
•       Office	149,453
•       Retail	1,600
•       Storage	3,102
	154,155
Total space available	1,707,456
Leased space commenced during the period:
•       Office(4)	198,250	214,637	$	73.72	$	62.63	$	60.01	4.1	7.0
•       Retail	11,715	11,180	$	356.82	$	475.65	$	111.55	8.3	10.3
•       Storage	1,082	994	$	35.92	$	—	$	—	—	13.1
Total leased space commenced	211,047	226,811	$	87.51	$	105.70	$	62.28	4.3	7.2
Total available space at end of period	1,496,409
Early renewals
•       Office	75,472	85,927	$	76.42	$	78.87	$	8.78	1.0	4.4
•       Retail	7,058	6,430	$	236.77	$	226.52	$	10.95	0.4	7.9
Total early renewals	82,530	92,357	$	87.59	$	89.15	$	8.93	1.0	4.6
Total commenced leases, including replaced previous vacancy
•       Office		300,564	$	74.50	$	70.30	$	45.36	3.2	6.3
•       Retail		17,610	$	312.99	$	384.69	$	74.82	5.5	9.4
•       Storage		994	$	35.92	$	—	$	—	—	13.1
Total commenced leases		319,168	$	87.53	$	98.04	$	46.85	3.3	6.5

57

	Useable SF		Rentable SF	New Cash Rent (per rentable SF) (1)		Prev. Escalated Rent (per rentable SF) (2)		TI/LC per rentable SF		Free Rent (in months)	Average Lease Term (in years)
Suburban
Space available at beginning of period	926,139
Sold vacancies	(61,954	)
Space which became available during the period(3)
•       Office	86,623
•       Storage	404
	87,027
Total space available	951,212
Leased space commenced during the period:
•       Office(5)	94,896		93,612	$	29.63	$	32.66	$	36.36	5.6	7.7
Total leased space commenced	94,896		93,612	$	29.63	$	32.66	$	36.36	5.6	7.7
Total available space at end of the period	856,316
Early renewals
•       Office	39,767		39,767	$	31.44	$	33.33	$	10.77	11.8	5.9
•       Retail	—		—	$	—	$	—	$	—	—	—
•       Storage	658		658	$	14.52	$	15.14	$	—	—	6.7
Total early renewals	40,425		40,425	$	31.16	$	33.03	$	10.59	11.6	6.0
Total commenced leases, including replaced previous vacancy
•       Office			133,379	$	30.17	$	32.94	$	28.73	7.5	7.2
•       Retail			—	$	—	$	—	$	—	—	—
•       Storage			658	$	14.52	$	15.14	$	—	—	6.7
Total commenced leases			134,037	$	30.09	$	32.82	$	28.59	7.4	7.4

(1) Annual initial base rent.

(2) Escalated rent is calculated as total annual income less electric charges.

(3) Includes expiring space, relocating tenants and move-outs where tenants vacated. Excludes lease expirations where tenants held over.

(4) Average starting office rent excluding new tenants replacing vacancies was $67.52 per rentable square feet for 96,047 rentable square feet. Average starting office rent for office space (leased and early renewals, excluding new tenants replacing vacancies) was $71.73 per rentable square feet for 181,974 rentable square feet.

(5) Average starting office rent excluding new tenants replacing vacancies was $30.96 per rentable square feet for 55,545 rentable square feet. Average starting office rent for office space (leased and early renewals, excluding new tenants replacing vacancies) was $31.16 per rentable square feet for 95,312 rentable square feet.

Investment Income

For the three months ended September 30, 2017, investment income decreased primarily as a result of additional income recognized from the recapitalization of a debt investment ($41.0 million) in the third quarter of 2016, partially offset by a larger weighted average book balance and an increase in the LIBOR benchmark rate. For the three months ended September 30, 2017, the weighted average debt and preferred equity investment balance outstanding and weighted average yield were $2.0 billion and 9.4%, excluding our investment in Two Herald Square which was put on non-accrual in August 2017, respectively, compared to $1.4 billion and 9.4%, respectively, for the same period in 2016. As of September 30, 2017, the debt and preferred equity investments had a weighted average term to maturity of 2.3 years excluding extension options and our investment in Two Herald Square.

Other Income

Other income increased primarily as a result of construction management and other fees earned from the One Vanderbilt venture ($0.5 million) in 2017.

Property Operating Expenses

Property operating expenses decreased primarily due to the effect of the partial sale and deconsolidation of 11 Madison Avenue ($3.7 million) in the third quarter of 2016, and the partial sale of 400 East 57th Street ($1.6 million) in the fourth quarter of 2016, offset by increased real estate taxes at our Same-Store Properties ($2.9 million).

58

Transaction Related Costs

The decrease in transaction related costs in 2017 is primarily due to the adoption of ASU No. 2017-01 in 2017, which clarified the definition of a business and provided guidance to assist in determining whether transactions should be accounted for as acquisitions of assets or businesses. Following the adoption of the guidance, most of our real estate acquisitions are considered asset acquisitions and transaction costs are therefore capitalized to the investment basis when they would have previously been expensed under the previous guidance. Transaction costs expensed in 2017 relate primarily to deals that are not moving forward for which any costs incurred are expensed.

Marketing, General and Administrative Expenses

Marketing, general and administrative expenses for the three months ended September 30, 2017 were $24.0 million, or 5.1% of total combined revenues, including our share of joint venture revenues, and an annualized 51 basis points of total combined assets, including our share of joint venture assets compared to $25.5 million, or 5.2% of total revenues including our share of joint venture revenues, and 55 basis points of total assets including our share of joint venture assets for 2016.

Interest Expense and Amortization of Deferred Financing Costs, Net of Interest Income

Interest expense and amortization of deferred financing costs, net of interest income, decreased primarily as a result of the Disposed Properties ($10.7 million) which included the deconsolidation of 11 Madison in the third quarter of 2016 ($6.4 million), partially offset by a higher weighted average balance of the 2012 revolving credit facility ($2.1 million), and a higher weighted average balance of the 2012 term loan facility ($1.6 million). The weighted average consolidated debt balance outstanding was $6.7 billion for the three months ended September 30, 2017 compared to $7.2 billion for the three months ended September 30, 2016. The consolidated weighted average interest rate was 3.98% for the three months ended September 30, 2017 as compared to 4.00% for the three months ended September 30, 2016.

Depreciation and Amortization

Depreciation and amortization decreased primarily as a result of the Disposed Properties ($11.0 million), the acquisition of 110 Greene Street ($5.6 million) and starting the redevelopment of 5-7 Dey Street, 183 & 187 Broadway in 2017 ($5.1 million).

Equity in Net Income in Unconsolidated Joint Venture

Equity in net income from unconsolidated joint ventures increased primarily as a result of additional depreciation expense from the deconsolidation of 11 Madison Avenue ($10.4 million) in 2016, partially offset by the repayment of a debt position held in an unconsolidated joint venture ($1.5 million).

Equity in Net Gain on Sale of Interest in Unconsolidated Joint Ventures/Real Estate

During the three months ended September 30, 2017, we recognized a gain on sale related to our interest in 102 Greene Street ($0.3 million).

59

Comparison of the nine months ended September 30, 2017 to the nine months ended September 30, 2016

The following comparison for the nine months ended September 30, 2017, or 2017, to the nine months ended September 30, 2016, or 2016, makes reference to the effect of the following: 

i. “Same-Store Properties,” which represents all operating properties owned by us at January 1, 2016 and still owned by us in the same manner at September 30, 2017 (Same-Store Properties totaled52 of our 63 consolidated operating properties),

ii. “Acquisition Properties,” which represents all properties or interests in properties acquired in 2017 and 2016 and all non-

Same-Store Properties, including properties that are under development, redevelopment or were deconsolidated during the period,

iii. "Disposed Properties" which represents all properties or interests in properties sold or partially sold in 2017 and 2016, and

iv. “Other,” which represents corporate level items not allocable to specific properties, as well as the Service Corporation and eEmerge Inc.

	Same-Store									Disposed				Other				Consolidated
(in millions)	2017		2016		$ Change			% Change		2017		2016		2017		2016		2017			2016			$ Change			% Change
Rental revenue	$	810.3	$	773.3	$	37.0		4.8	%	$	10.9	$	255.4	$	14.3	$	15.2	$	835.5		$	1,043.9		$	(208.4	)	(20.0	)%
Escalation and reimbursement	126.9		134.4		(7.5		)	(5.6	)%	3.5		11.5		1.2		1.5		131.6			147.4			(15.8		)	(10.7	)%
Investment income	—		—		—			—	%	—		—		148.7		174.3		148.7			174.3			(25.6		)	(14.7	)%
Other income	5.0		5.4		(0.4		)	(7.4	)%	0.3		94.1		29.0		24.6		34.3			124.1			(89.8		)	(72.4	)%
Total revenues	942.2		913.1		29.1			3.2	%	14.7		361.0		193.2		215.6		1,150.1			1,489.7			(339.6		)	(22.8	)%
Property operating expenses	412.7		404.1		8.6			2.1	%	3.7		30.5		16.0		12.6		432.4			447.2			(14.8		)	(3.3	)%
Transaction related costs	—		—		—			—	%	—		—		0.4		6.0		0.4			6.0			(5.6		)	(93.3	)%
Marketing, general and administrative	—		—		—			—	%	—		—		72.4		74.0		72.4			74.0			(1.6		)	(2.2	)%
	412.7		404.1		8.6			2.1	%	3.7		30.5		88.8		92.6		505.2			527.2			(22.0		)	(4.2	)%
Operating income before equity in net income from unconsolidated joint ventures	$	529.5	$	509.0	$	20.5		4.0	%	$	11.0	$	330.5	$	104.4	$	123.0	$	644.9		$	962.5		$	(317.6	)	(33.0	)%
Other income (expenses):
Interest expense and amortization of deferred financing costs, net of interest income																		(208.3		)	(276.5		)	68.2			(24.7	)%
Depreciation and amortization																		(318.9		)	(717.0		)	398.1			(55.5	)%
Equity in net income (loss) from unconsolidated joint ventures																		14.1			12.0			2.1			17.5	%
Equity in net gain on sale of interest in unconsolidated joint venture/real estate																		16.2			43.6			(27.4		)	(62.8	)%
Gain (loss) on sale of real estate, net																		(3.3		)	210.8			(214.1		)	(101.6	)%
Depreciable real estate reserves																		(85.3		)	(10.4		)	(74.9		)	720.2	%
Gain (loss) on sale of investment in marketable securities																		3.3			(0.1		)	3.4			(3,400.0	)%
Net income																		$	62.7		$	224.9		$	(162.2	)	(72.1	)%

Rental, Escalation and Reimbursement Revenues

Rental revenues decreased primarily as a result of Disposed Properties ($244.4 million), which included 388-390 Greenwich Street and the effect of the partial sale and deconsolidation of 11 Madison Avenue in the third quarter of 2016, partially offset by increased rental revenue at our Same-Store Properties ($37.0 million). Increased rental revenue at Same-Store Properties was primarily driven by 1515 Broadway which, in 2016, recognized accounting write-offs ($17.4 million) related to the space previously leased to Aeropostale following the tenant's bankruptcy, 919 Third Avenue ($7.8 million), and 711 Third Avenue ($7.7 million).

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Escalation and reimbursement revenue decreased primarily as a result of Disposed Properties ($8.0 million) and lower recoveries at our Same-Store properties ($7.5 million).

The following table presents a summary of the commenced leasing activity for the three months ended September 30, 2017 in our Manhattan and Suburban portfolio:

	Useable SF	Rentable SF	New Cash Rent (per rentable SF) (1)		Prev. Escalated Rent (per rentable SF) (2)		TI/LC per rentable SF		Free Rent (in months)	Average Lease Term (in years)
Manhattan
Space available at beginning of the year	1,149,571
Space which became available during the year (3)
•       Office	1,006,674
•       Retail	28,858
•       Storage	14,189
	1,049,721
Total space available	2,199,292
Leased space commenced during the year:
•       Office(4)	642,073	705,353	$	74.68	$	65.09	$	57.23	5.2	7.7
•       Retail	27,873	58,070	$	315.78	$	253.52	$	40.66	6.5	13.4
•       Storage	32,937	3,657	$	35.86	$	42.91	$	0.29	—	6.4
Total leased space commenced	702,883	767,080	$	92.75	$	91.45	$	55.70	5.2	8.1
Total available space at end of year	1,496,409
Early renewals
•       Office	200,430	189,071	$	80.60	$	76.11	$	15.10	1.9	4.6
•       Retail	44,602	33,812	$	70.91	$	47.20	$	2.08	0.1	5.5
•       Storage	2,236	2,291	$	29.99	$	31.02	$	—	—	2.6
Total early renewals	247,268	225,174	$	78.63	$	71.31	$	13.00	1.6	4.7
Total commenced leases, including replaced previous vacancy
•       Office		894,424	$	75.93	$	68.93	$	48.32	4.5	7.0
•       Retail		91,882	$	225.67	$	177.59	$	26.46	4.2	10.5
•       Storage		5,948	$	33.60	$	36.38	$	0.18	—	4.9
Total commenced leases		992,254	$	89.54	$	84.35	$	46.01	4.4	7.3

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	Useable SF		Rentable SF	New Cash Rent (per rentable SF) (1)		Prev. Escalated Rent (per rentable SF) (2)		TI/LC per rentable SF		Free Rent (in months)	Average Lease Term (in years)
Suburban
Space available at beginning of period	965,021
Sold vacancies	(73,919	)
Space which became available during the year (3)
•       Office	211,272
•       Retail	338
•       Storage	1,889
	213,499
Total space available	1,104,601
Leased space commenced during the year:
•       Office(5)	246,960		259,258	$	30.06	$	34.51	$	36.34	6.3	7.7
•       Retail	338		338	$	33.00	$	33.00	$	—	—	5.0
•       Storage	987		1,054	$	23.72	$	23.72	$	27.46	2.4	9.2
Total leased space commenced	248,285		260,650	$	30.04	$	34.45	$	36.25	6.3	7.7
Total available space at end of the year	856,316
Early renewals
•       Office	110,975		112,509	$	30.95	$	31.16	$	4.26	5.8	4.1
•       Storage	1,410		1,410	$	14.78	$	14.00	$	—	—	4.5
Total early renewals	112,385		113,919	$	30.75	$	30.95	$	4.21	5.8	4.2
Total commenced leases, including replaced previous vacancy
•       Office			371,767	$	30.33	$	32.67	$	26.63	6.2	6.6
•       Retail			338	$	33.00	$	33.00	$	—	—	5.0
•       Storage			2,464	$	18.60	$	14.26	$	11.75	1.0	6.5
Total commenced leases			374,569	$	30.26	$	32.53	$	26.51	6.1	6.6

(1) Annual initial base rent.

(2) Escalated rent is calculated as total annual income less electric charges.

(3) Includes expiring space, relocating tenants and move-outs where tenants vacated. Excludes lease expirations where tenants held over.

(4) Average starting office rent excluding new tenants replacing vacancies was $70.53 per rentable square feet for 353,537 rentable square feet. Average starting office rent for office space (leased and early renewals, excluding new tenants replacing vacancies) was $74.04 per rentable square feet for 542,608 rentable square feet.

(5) Average starting office rent excluding new tenants replacing vacancies was $35.65 per rentable square feet for 89,326 rentable square feet. Average starting office rent for office space (leased and early renewals, excluding new tenants replacing vacancies) was $33.01 per rentable square feet for 182,112 rentable square feet.

Investment Income

For the nine months ended September 30, 2017, investment income decreased primarily as a result of additional income recognized from the recapitalization of a debt investment ($41.0 million) in the third quarter of 2016, partially offset by previously unrecognized income related to our preferred equity investment in 885 Third Avenue ($14.3 million), a larger weighted average book balance and an increase in the LIBOR benchmark rate. For the nine months ended September 30, 2017, the weighted average debt and preferred equity investment balance outstanding and weighted average yield were $1.9 billion and 9.3% excluding our investment in Two Herald Square which was put on non-accrual in August 2017, respectively, compared to $1.5 billion and 9.8%, respectively, for the same period in 2016. As of September 30, 2017, the debt and preferred equity investments had a weighted average term to maturity of 2.3 years excluding extension options and our investment in Two Herald Square.

Other Income

Other income decreased primarily as a result of the termination fee earned in connection with the termination of the lease with Citigroup, Inc. at 388-390 Greenwich in 2016 ($94.0 million) and promote income earned in connection with the sale of 33 Beekman in the second quarter of 2016 ($10.8 million). The decrease was partially offset by net fees recognized in connection with the One Vanderbilt venture in 2017 ($10.8 million).

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Property Operating Expenses

Property operating expenses decreased primarily as a result of Disposed Properties ($26.7 million) offset by increased real estate taxes at our Same-Store Properties ($8.0 million).

Transaction Related Costs

The decrease in transaction related costs in 2017 is primarily due to the adoption of ASU No. 2017-01 in 2017, which clarified the definition of a business and provided guidance to assist in determining whether transactions should be accounted for as acquisitions of assets or businesses. Following the adoption of the guidance, most of our real estate acquisitions are considered asset acquisitions and transaction costs are therefore capitalized to the investment basis when they would have previously been expensed under the previous guidance. Transaction costs expensed in 2017 related primarily to deals that are not moving forward for which any costs incurred are expensed.

Marketing, General and Administrative Expenses

Marketing, general and administrative expenses for the nine months ended September 30, 2017 were $72.4 million, or 5.1% of total combined revenues, including our share of joint venture revenues, and annualized 52 basis points of total combined assets, including our share of joint venture assets compared to $74.0 million, or 4.4% of total revenues including our share of joint venture revenues, and 53 basis points of total assets including our share of joint venture assets for 2016.

Interest Expense and Amortization of Deferred Financing Costs, Net of Interest Income

Interest expense and amortization of deferred financing costs, net of interest income, decreased primarily as a result of the Disposed Properties ($64.5 million). The weighted average consolidated debt balance outstanding was $6.6 billion for the nine months ended September 30, 2017 compared to $9.1 billion for the nine months ended September 30, 2016. The consolidated weighted average interest rate was 4.02% for the nine months ended September 30, 2017 as compared to 3.79% for the nine months ended September 30, 2016.

Depreciation and Amortization

Depreciation and amortization decreased primarily as a result of the Disposed Properties ($440.5 million), partially offset

by accelerated amortization at 5-7 Dey Street, 183 & 187 Broadway upon the commencement of demolition of the properties ($39.9 million).

Equity in Net Income in Unconsolidated Joint Venture

Equity in net income from unconsolidated joint ventures increased primarily as a result of higher net income contributions from 1745 Broadway ($6.4 million) in 2017, partially offset by a reduced occupancy at 3 Columbus Circle ($3.5 million).

Equity in Net Gain on Sale of Interest in Unconsolidated Joint Ventures/Real Estate

During the nine months ended September 30, 2017, we recognized a gain on sale related to our interests in 747 Madison Avenue ($13.0 million), part of our interest in the Stonehenge Portfolio ($0.9 million), and 102 Greene Street ($0.3 million). The sale of 747 Madison, which occurred in 2014, did not meet the criteria for sale accounting at that time and, therefore, remained on our consolidated financial statement until the criteria was met in the second quarter of 2017. During the nine months ended September 30, 2016, we recognized a gain on the sale related to our interests in 33 Beekman ($33.0 million), 7 Renaissance Square ($4.2 million), 1 Jericho ($3.3 million) and EOP Denver ($2.8 million).

Gain (loss) on sale of real estate, net

During the nine months ended September 30, 2017, we recognized a loss on the sale of 885 Third Avenue ($8.8 million) which closed in 2016, but was only recognized in the second quarter of 2017 due to the sale not meeting the criteria for sale accounting under the full accrual method in ASC 360-20 until the second quarter of 2017. This loss was partially offset by a gain on sale associated with the partial sale of the property at 102 Greene Street ($4.9 million). During the nine months ended September 30, 2016, we recognized gains on sale associated with the sale of the property at 388-390 Greenwich ($206.5 million) and 248-252 Bedford Avenue in Brooklyn, New York ($15.3 million), which were partially offset by the sale loss on sale of 7 International Drive, Westchester County, NY ($6.9 million).

Depreciable Real Estate Reserves

During the nine months ended September 30, 2017, we recorded a $85.3 million charge related to 125 Chubb Avenue in Lyndhurst, NJ, Stamford Towers and 520 White Plains Road in Tarrytown, NY. During the nine months ended September 30, 2016, we recognized depreciable real estate reserves related to 500 West Putnam ($10.4 million).

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Liquidity and Capital Resources

We currently expect that our principal sources of funds to meet our short-term and long-term liquidity requirements for working capital, acquisitions, development or redevelopment of properties, tenant improvements, leasing costs, repurchases or repayments of outstanding indebtedness (which may include exchangeable debt) and for debt and preferred equity investments will include:

(1) Cash flow from operations;

(2) Cash on hand;

(3) Borrowings under the 2012 credit facility;

(4) Other forms of secured or unsecured financing;

(5) Net proceeds from divestitures of properties and redemptions, participations and dispositions of debt and preferred equity investments; and

(6) Proceeds from common or preferred equity or debt offerings by the Company, the Operating Partnership (including issuances of units of limited partnership interest in the Operating Partnership and Trust preferred securities) or ROP.

Cash flow from operations is primarily dependent upon the occupancy level of our portfolio, the net effective rental rates achieved on our leases, the collectability of rent, operating escalations and recoveries from our tenants and the level of operating and other costs. Additionally, we believe that our debt and preferred equity investment program will continue to serve as a source of operating cash flow.

The combined aggregate principal maturities of our property mortgages and other loans payable, corporate obligations and our share of joint venture debt, including as-of-right extension options, as of September 30, 2017 are as follows (in thousands):

	Remaining 2017		2018		2019		2020		2021		Thereafter		Total
Property mortgages and other loans	$	12,846	$	170,108	$	59,618	$	720,958	$	30,418	$	2,666,471	$	3,660,419
MRA and FHLB facilities	—		184,642		—		—		—		—		184,642
Corporate obligations (1)	269,000		250,000		1,183,000		530,000		—		400,000		2,632,000
Joint venture debt-our share	79,787		242,799		705,574		320,914		376,765		1,465,371		3,191,210
Total	$	361,633	$	847,549	$	1,948,192	$	1,571,872	$	407,183	$	4,531,842	$	9,668,271

(1) The $269.0 million of 3.00% convertible notes which matured in October 2017 became exchangeable commencing September 14, 2017 and the Operating Partnership elected to settle exchanges in cash. In October 2017, all note holders elected to exchange the notes and the notes were repaid for $350.8 million.

As of September 30, 2017, we had $270.3 million of consolidated cash on hand, inclusive of $28.8 million of marketable securities. We expect to generate positive cash flow from operations for the foreseeable future. We may seek to divest of properties or interests in properties or access private and public debt and equity capital when the opportunity presents itself, although there is no guarantee that this capital will be made available to us at efficient levels or at all. Management believes that these sources of liquidity, if we are able to access them, along with potential refinancing opportunities for secured debt, will allow us to satisfy our debt obligations, as described above, upon maturity, if not before.

We also have investments in several real estate joint ventures with various partners who we consider to be financially stable and who have the ability to fund a capital call when needed. Most of our joint ventures are financed with non-recourse debt. We believe that property level cash flows along with unfunded committed indebtedness and proceeds from the refinancing of outstanding secured indebtedness will be sufficient to fund the capital needs of our joint venture properties.

Cash Flows

The following summary discussion of our cash flows is based on our consolidated statements of cash flows in "Item 1. Financial Statements" and is not meant to be an all-inclusive discussion of the changes in our cash flows for the periods presented below.

Cash and cash equivalents were $241.5 million and $405.9 million at September 30, 2017 and 2016, respectively, representing a decrease of $164.4 million. The decrease was a result of the following changes in cash flows (in thousands):

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	Nine Months Ended September 30,
	2017			2016			Increase (Decrease)
Net cash provided by operating activities	$	416,621		$	508,792		$	(92,171	)
Net cash (used in) provided by investing activities	$	(101,041	)	$	2,405,173		$	(2,506,214	)
Net cash used in financing activities	$	(353,534	)	$	(2,763,468	)	$	2,409,934

Our principal source of operating cash flow is related to the leasing and operating of the properties in our portfolio. Our properties provide a relatively consistent stream of cash flow that provides us with resources to pay operating expenses, debt service and fund quarterly dividend and distribution requirements. Our debt and preferred equity and joint venture investments also provide a steady stream of operating cash flow to us.

Cash is used in investing activities to fund acquisitions, development or redevelopment projects and recurring and nonrecurring capital expenditures. We selectively invest in new projects that enable us to take advantage of our development, leasing, financing and property management skills and invest in existing buildings that meet our investment criteria. During the nine months ended September 30, 2017, when compared to the nine months ended September 30, 2016, we used cash primarily for the following investing activities (in thousands):

Acquisitions of real estate property	$	12,891
Additions to land, buildings and improvements	18,024
Escrowed cash—capital improvements/acquisition deposits/deferred purchase price	(68,552		)
Investments in unconsolidated joint ventures	(43,275		)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	108,006
Net proceeds from disposition of real estate/joint venture interest	(2,302,858		)
Proceeds from sale or redemption of marketable securities	48,261
Purchases of marketable securities	23,062
Other investments	38,723
Origination of debt and preferred equity investments	(380,921		)
Repayments or redemption of debt and preferred equity investments	40,425
Decrease in net cash provided by investing activities	$	(2,506,214	)

Funds spent on capital expenditures, which comprise building and tenant improvements, decreased from $269.2 million for the nine months ended September 30, 2016 to $251.2 million for the nine months ended September 30, 2017, relating primarily to decreased costs incurred in connection with the redevelopment of properties.

We generally fund our investment activity through the sale of real estate, property-level financing, our 2012 credit facility, our MRA facilities, senior unsecured notes, convertible or exchangeable securities, construction loans and from time to time, Company issued common or preferred stock, or the Operating Partnership may issue common or preferred units of limited partnership interest.

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During the nine months ended September 30, 2017, when compared to the nine months ended September 30, 2016, we used cash for the following financing activities (in thousands):

Proceeds from mortgages and other loans payable	$	523,443
Repayments of mortgages and other loans payable	1,079,978
Proceeds from revolving credit facility and senior unsecured notes	187,500
Repayments of revolving credit facility and senior unsecured notes	998,800
Proceeds from stock options exercised and DRIP issuance	71
Repurchase of common stock	(349,991		)
Redemption of preferred stock	2,874
Distributions to noncontrolling interests in other partnerships	(34,066		)
Contributions from noncontrolling interests in other partnerships	31,183
Distributions to noncontrolling interests in the Operating Partnership	(1,394		)
Dividends paid on common and preferred stock	(16,900		)
Other obligations related to loan participations	(42,413		)
Deferred loan costs and capitalized lease obligation	30,849
Decrease in net cash used in financing activities	$	2,409,934

Capitalization

Our authorized capital stock consists of 260,000,000 shares, $0.01 par value per share, consisting of 160,000,000 shares of common stock, $0.01 par value per share, 75,000,000 shares of excess stock, at $0.01 par value per share, and 25,000,000 shares of preferred stock, $0.01 par value per share. As of September 30, 2017, 97,445,509 shares of common stock and no shares of excess stock were issued and outstanding.

As of September 30, 2017, SL Green had 9,200,000 shares of our 6.50% Series I Cumulative Redeemable Preferred Stock, or Series I Preferred Stock, outstanding. In addition, persons other than the Company held Preferred Units of limited partnership interests in the Operating Partnership having an aggregate liquidation preference of $301.9 million.

In August 2016, our board of directors approved a stock repurchase plan under which we can buy up to $1.0 billion of shares of our common stock. At September 30, 2017, repurchases made under the stock repurchase plans were as follows:

Period	Total number of shares purchased	Average price paid per share	Total number of shares purchased as part of the repurchase plan or programs	Maximum approximate dollar value of shares that may yet be purchased under the plan (in millions)
First quarter 2017	982	$103.89	982	$999.9
Second quarter 2017	2,447,153	$103.41	2,448,135	$746.8
Third quarter 2017	951,866	$101.67	3,400,001	$650.0

Dividend Reinvestment and Stock Purchase Plan

The following table summarizes SL Green common stock issued, and proceeds received from dividend reinvestments and/or stock purchases under the DRSPP for the nine months ended September 30, 2017 and 2016, respectively (dollars in thousands):

	Nine Months Ended September 30,
	2017		2016
Shares of common stock issued	1,771		1,432
Dividend reinvestments/stock purchases under the DRSPP	$	185	$	146

Fourth Amended and Restated 2005 Stock Option and Incentive Plan

The Fourth Amended and Restated 2005 Stock Option and Incentive Plan, or the 2005 Plan, was approved by the Company's board of directors in April 2016 and its stockholders in June 2016 at the Company's annual meeting of stockholders. Subject to adjustments upon certain corporate transactions or events, awards with respect to up to a maximum of 27,030,000 fungible units may be granted as options, restricted stock, phantom shares, dividend equivalent rights and other equity-based awards under the

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2005 Plan. As of September 30, 2017, 8.7 million fungible units were available for issuance under the 2005 Plan after reserving for shares underlying outstanding restricted stock units, phantom stock units granted pursuant to our Non-Employee Directors' Deferral Program and LTIP Units, including, among others, outstanding LTIP Units issued under our 2014 Outperformance Plan.

2014 Outperformance Plan

The cost of the 2014 Outperformance Plan ($29.2 million, subject to forfeitures), based on the portion of the 2014 Outperformance Plan granted as of September 30, 2017, will be amortized into earnings through the final vesting period. We recorded compensation expense of $1.9 million and $8.2 million for the three and nine months ended September 30, 2017, respectively, related to the 2014 Outperformance Plan. We recorded compensation expense of $1.8 million and $6.6 million for the three and nine months ended September 30, 2016, respectively, related to the 2014 Outperformance Plan.

Deferred Compensation Plan for Directors

During the nine months ended September 30, 2017, 11,510 phantom stock units and 9,171 shares of common stock were issued to our board of directors. We recorded compensation expense of $0.1 million and $2.2 million during the three and nine months ended September 30, 2017, respectively, related to the Deferred Compensation Plan. We recorded compensation expense of $0.1 million and $1.9 million during the three and nine months ended September 30, 2016, respectively, related to the Deferred Compensation Plan.

As of September 30, 2017, there were 98,637 phantom stock units outstanding pursuant to our Non-Employee Director's Deferral Program.

Market Capitalization

At September 30, 2017, borrowings under our mortgages and other loans payable, 2012 credit facility, senior unsecured notes, trust preferred securities and our share of joint venture debt represented 47.1% of our combined market capitalization of $20.5 billion (based on a common stock price of $101.32 per share, the closing price of SL Green's common stock on the NYSE on September 30, 2017). Market capitalization includes our consolidated debt, common and preferred stock and the conversion of all units of limited partnership interest in the Operating Partnership, and our share of joint venture debt.

Indebtedness

The table below summarizes our consolidated mortgages and other loans payable, 2012 credit facility, senior unsecured notes and trust preferred securities outstanding at September 30, 2017 and December 31, 2016, (amounts in thousands).

Debt Summary:	September 30, 2017			December 31, 2016
Balance
Fixed rate	$	4,354,810		$	4,094,390
Variable rate—hedged	800,000			1,357,694
Total fixed rate	5,154,810			5,452,084
Total variable rate	1,321,813			1,105,585
Total debt	$	6,476,623		$	6,557,669
Debt, preferred equity, and other investments subject to variable rate	1,214,798			1,359,744
Net exposure to variable rate debt	107,015			(254,159		)
Percent of Total Debt:
Fixed rate	79.6		%	83.1		%
Variable rate	20.4		%	16.9		%
Total	100.0		%	100.0		%
Effective Interest Rate for the Year:
Fixed rate	4.33		%	4.35		%
Variable rate	2.75		%	2.10		%
Effective interest rate	4.02		%	3.82		%

The variable rate debt shown above generally bears interest at an interest rate based on 30-day LIBOR (1.23% and 0.77% at September 30, 2017 and December 31, 2016, respectively). Our consolidated debt at September 30, 2017 had a weighted average term to maturity of 4.72 years.

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Certain of our debt and equity investments and other investments, with a carrying value of $1.2 billion at September 30, 2017, are variable rate investments which mitigate our exposure to interest rate changes on our unhedged variable rate debt.

2012 Credit Facility

As of September 30, 2017, we had $80.8 million of outstanding letters of credit, $280.0 million drawn under the revolving credit facility and $1.2 billion outstanding under the term loan facility, with total undrawn capacity of $1.2 billion under the 2012 credit facility. At September 30, 2017 and December 31, 2016, the revolving credit facility had a carrying value of $275.8 million and $(6.3) million, respectively, net of deferred financing costs. The December 31, 2016 carrying value represents deferred financing costs and is presented within other liabilities. At September 30, 2017 and December 31, 2016, the term loan facility had a carrying value of $1.2 billion and $1.2 billion, respectively, net of deferred financing costs.

Restrictive Covenants

The terms of the 2012 credit facility, as amended, and certain of our senior unsecured notes include certain restrictions and covenants which may limit, among other things, our ability to pay dividends, make certain types of investments, incur additional indebtedness, incur liens and enter into negative pledge agreements and dispose of assets, and which require compliance with financial ratios relating to the maximum ratio of total indebtedness to total asset value, a minimum ratio of EBITDA to fixed charges, a maximum ratio of secured indebtedness to total asset value and a maximum ratio of unsecured indebtedness to unencumbered asset value. The dividend restriction referred to above provides that, we will not during any time when a default is continuing, make distributions with respect to common stock or other equity interests, except to enable the Company to continue to qualify as a REIT for Federal income tax purposes. As of September 30, 2017 and 2016, we were in compliance with all such covenants.

Interest Rate Risk

We are exposed to changes in interest rates primarily from our variable rate debt. Our exposure to interest rate fluctuations are managed through either the use of interest rate derivative instruments and/or through our variable rate debt and preferred equity investments. A hypothetical 100 basis point increase in interest rates along the entire interest rate curve for 2017 would increase our consolidated annual interest cost, net of interest income from variable rate debt and preferred equity investments, by $1.0 million and would increase our share of joint venture annual interest cost by $16.6 million. At September 30, 2017, 59.9% of our $2.0 billion debt and preferred equity portfolio is indexed to LIBOR.

We recognize most derivatives on the balance sheet at fair value. Derivatives that are not hedges are adjusted to fair value through income. If a derivative is considered a hedge, depending on the nature of the hedge, changes in the fair value of the derivative will either be offset against the change in fair value of the hedged asset, liability, or firm commitment through earnings, or recognized in other comprehensive income until the hedged item is recognized in earnings. The ineffective portion of a derivative's change in fair value is immediately recognized in earnings.

Our long-term debt of $5.2 billion bears interest at fixed rates, and therefore the fair value of these instruments is affected by changes in the market interest rates. Our variable rate debt and variable rate joint venture debt as of September 30, 2017 bore interest based on a spread of LIBOR plus 125 basis points to LIBOR plus 417 basis points.

Contractual Obligations

Refer to our 2016 Annual Report on Form 10-K for a discussion of our contractual obligations. There have been no material changes, outside the ordinary course of business, to these contractual obligations during the three and nine months ended September 30, 2017.

Off-Balance Sheet Arrangements

We have off-balance sheet investments, including joint ventures and debt and preferred equity investments. These investments all have varying ownership structures. Substantially all of our joint venture arrangements are accounted for under the equity method of accounting as we have the ability to exercise significant influence, but not control, over the operating and financial decisions of these joint venture arrangements. Our off-balance sheet arrangements are discussed in Note 5, "Debt and Preferred Equity Investments" and Note 6, "Investments in Unconsolidated Joint Ventures" in the accompanying consolidated financial statements.

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Capital Expenditures

We estimate that for the remainder of the year ending December 31, 2017, we expect to incur $66.9 million of recurring capital expenditures and $14.6 million of development or redevelopment expenditures, net of loan reserves, (including tenant improvements and leasing commissions) on existing consolidated properties, and our share of capital expenditures at our joint venture properties, net of loan reserves, will be $109.5 million. Future property acquisitions may require substantial capital investments for refurbishment and leasing costs. We expect to fund these capital expenditures with operating cash flow, existing liquidity, or incremental borrowings. We expect our capital needs over the next twelve months and thereafter will be met through a combination of cash on hand, net cash provided by operations, potential asset sales, borrowings or additional equity or debt issuances.

Dividends/Distributions

We expect to pay dividends to our stockholders based on the distributions we receive from our Operating Partnership primarily from property revenues net of operating expenses or, if necessary, from working capital.

To maintain our qualification as a REIT, we must pay annual dividends to our stockholders of at least 90% of our REIT taxable income, determined before taking into consideration the dividends paid deduction and net capital gains. We intend to continue to pay regular quarterly dividends to our stockholders. Based on our current annual dividend rate of $3.10 per share, we would pay $316.2 million in dividends to SL Green's common stockholders on an annual basis. Before we pay any dividend, whether for Federal income tax purposes or otherwise, which would only be paid out of available cash to the extent permitted under the 2012 credit facility and senior unsecured notes, we must first meet both our operating requirements and scheduled debt service on our mortgages and loans payable.

Insurance

We maintain “all-risk” property and rental value coverage (including coverage regarding the perils of flood, earthquake and terrorism, excluding nuclear, biological, chemical, and radiological terrorism ("NBCR")), within three property insurance programs and liability insurance. Management believes the policy specifications and insured limits are appropriate given the relative risk of loss, the cost of the coverage, and industry practice. Separate property and liability coverage may be purchased on a stand-alone basis for certain assets, such as the development of One Vanderbilt.

On January 12, 2015, the Terrorism Risk Insurance Program Reauthorization and Extension Act of 2007 ("TRIPRA") (formerly the Terrorism Risk Insurance Act) was reauthorized until December 31, 2020 pursuant to the Terrorism Insurance Program Reauthorization and Extension Act of 2015. The TRIPRA extends the federal Terrorism Insurance Program that requires insurance companies to offer terrorism coverage and provides for compensation for insured losses resulting from acts of certified terrorism, subject to the current program trigger of $120.0 million, which will increase by $20.0 million per annum, commencing December 31, 2015 (Trigger). Coinsurance under TRIPRA is 16%, increasing 1% per annum, as of December 31, 2015 (Coinsurance). There are no assurances TRIPRA will be further extended.

Our wholly-owned taxable REIT subsidiary, Belmont Insurance Company, or Belmont, acts as a captive insurance company and as one of the elements of our overall insurance program. Belmont was formed in an effort, among other reasons, to stabilize to some extent the impact of insurance market fluctuations. Belmont is licensed by New York State as a direct insurer of Terrorism and NBCR Terrorism, and a reinsurer with respect to portions of our General Liability, Environmental Liability, Flood, Professional Liability, Employment Practices Liability and D&O coverage. Belmont purchases reinsurance for its Coinsurance and is backstopped by the Federal government for the balance of its terrorism limit for certified acts of terrorism above the Trigger. We purchase direct, third party terrorism insurance up to the Trigger for certified acts of terrorism. Belmont is backstopped by the Federal government for certified acts of NBCR terrorism above the Trigger and subject to its Coinsurance, however does not reinsure its NBCR Coinsurance requirement. There is no coverage for a NBCR terrorism act if covered industry losses are below the Trigger. As long as we own Belmont, we are responsible for its liquidity and capital resources, and the accounts of Belmont are part of our consolidated financial statements. If we experience a loss and Belmont is required to pay a claim under our insurance policies, we would ultimately record the loss to the extent of Belmont's required payment. Therefore, certain insurance coverage provided by Belmont should not be considered as the equivalent of third-party insurance, but rather as a modified form of self-insurance.

Our debt instruments, consisting of mortgage loans secured by our properties (which are generally non-recourse to us), mezzanine loans, ground leases, our 2012 credit facility, senior unsecured notes and other corporate obligations, contain customary covenants requiring us to maintain insurance. Although we believe that we currently maintain sufficient insurance coverage to satisfy these obligations, there is no assurance that in the future we will be able to procure coverage at a reasonable cost. In such instances, there can be no assurance that the lenders or ground lessors under these instruments will not take the position that a total or partial exclusion from “all-risk” insurance coverage for losses due to, for example, terrorist acts is a breach of these debt and ground lease instruments allowing the lenders or ground lessors to declare an event of default and accelerate repayment of debt or recapture of ground lease positions. In addition, if lenders require greater coverage that we are unable to obtain at

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commercially reasonable rates, we may incur substantially higher insurance premiums or our ability to finance our properties and expand our portfolio may be adversely impacted.

Furthermore, with respect to certain of our properties, including properties held by joint ventures, or subject to triple net leases, insurance coverage is obtained by a third-party and we do not control the coverage. While we may have agreements with such third parties to maintain adequate coverage and we monitor these policies, such coverage ultimately may not be maintained or adequately cover our risk of loss. We may have less protection than with respect to the properties where we obtain coverage directly. Although we consider our insurance coverage to be appropriate, in the event of a major catastrophe, we may not have sufficient coverage to replace certain properties.

Funds from Operations

FFO is a widely recognized non-GAAP measure of REIT performance. The Company computes FFO in accordance with standards established by the National Association of Real Estate Investment Trusts, or NAREIT, which may not be comparable to FFO reported by other REITs that do not compute FFO in accordance with the NAREIT definition, or that interpret the NAREIT definition differently than the Company does. The revised White Paper on FFO approved by the Board of Governors of NAREIT in April 2002, and subsequently amended, defines FFO as net income (loss) (computed in accordance with Generally Accepted Accounting Principles, or GAAP), excluding gains (or losses) from sales of properties, debt restructurings and real estate related impairment charges, plus real estate related depreciation and amortization and after adjustments for unconsolidated partnerships and joint ventures.

The Company presents FFO because it considers it an important supplemental measure of the Company’s operating performance and believes that it is frequently used by securities analysts, investors and other interested parties in the evaluation of REITs, particularly those that own and operate commercial office properties. The Company also uses FFO as one of several criteria to determine performance-based bonuses for members of its senior management. FFO is intended to exclude GAAP historical cost depreciation and amortization of real estate and related assets, which assumes that the value of real estate assets diminishes ratably over time. Historically, however, real estate values have risen or fallen with market conditions. Because FFO excludes depreciation and amortization unique to real estate, gains and losses from property dispositions, and extraordinary items, it provides a performance measure that, when compared year over year, reflects the impact to operations from trends in occupancy rates, rental rates, operating costs, and interest costs, providing perspective not immediately apparent from net income. FFO does not represent cash generated from operating activities in accordance with GAAP and should not be considered as an alternative to net income (determined in accordance with GAAP), as an indication of the Company’s financial performance or to cash flow from operating activities (determined in accordance with GAAP) as a measure of the Company’s liquidity, nor is it indicative of funds available to fund the Company’s cash needs, including our ability to make cash distributions.

FFO for the three and nine months ended September 30, 2017 and 2016 are as follows (in thousands):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Net income attributable to SL Green common stockholders	$	38,869		$	34,252		$	58,442		$	190,930
Add:
Depreciation and amortization	91,728			112,665			318,916			717,015
Joint venture depreciation and noncontrolling interest adjustments	23,517			23,349			72,936			42,191
Net income (loss) attributable to noncontrolling interests	338			2,499			(15,472		)	14,416
Less:
Gain (loss) on sale of real estate, net	—			397			(3,256		)	210,750
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	1,030			225			16,166			43,588
Depreciation on non-rental real estate assets	557			509			1,636			1,505
Depreciable real estate reserves	—			—			(85,336		)	(10,387		)
Funds from Operations attributable to SL Green common stockholders and noncontrolling interests	$	152,865		$	171,634		$	505,612		$	719,096
Cash flows provided by operating activities	$	102,899		$	135,414		$	416,621		$	508,792
Cash flows provided by (used in) investing activities	$	162,732		$	278,426		$	(101,041	)	$	2,405,173
Cash flows used in financing activities	$	(295,107	)	$	(284,170	)	$	(353,534	)	$	(2,763,468	)

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Inflation

Substantially all of our office leases provide for separate real estate tax and operating expense escalations as well as operating expense recoveries based on increases in the Consumer Price Index or other measures such as porters' wage. In addition, many of the leases provide for fixed base rent increases. We believe that inflationary increases will be at least partially offset by the contractual rent increases and expense escalations described above.

Accounting Standards Updates

The Accounting Standards Updates are discussed in Note 2, "Significant Accounting Policies-Accounting Standards Updates" in the accompanying consolidated financial statements.

Forward-Looking Information

This report includes certain statements that may be deemed to be "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995 and are intended to be covered by the safe harbor provisions thereof. All statements, other than statements of historical facts, included in this report that address activities, events or developments that we expect, believe or anticipate will or may occur in the future, including such matters as future capital expenditures, dividends and acquisitions (including the amount and nature thereof), development trends of the real estate industry and the Manhattan, Brooklyn, Westchester County, Connecticut, Long Island and New Jersey office markets, business strategies, expansion and growth of our operations and other similar matters, are forward-looking statements. These forward-looking statements are based on certain assumptions and analyses made by us in light of our experience and our perception of historical trends, current conditions, expected future developments and other factors we believe are appropriate.

Forward-looking statements are not guarantees of future performance and actual results or developments may differ materially, and we caution you not to place undue reliance on such statements. Forward-looking statements are generally identifiable by the use of the words "may," "will," "should," "expect," "anticipate," "estimate," "believe," "intend," "project," "continue," or the negative of these words, or other similar words or terms.

Forward-looking statements contained in this report are subject to a number of risks and uncertainties that may cause our actual results, performance or achievements to be materially different from future results, performance or achievements expressed or implied by forward-looking statements made by us. These risks and uncertainties include:

• the effect of general economic, business and financial conditions, and their effect on the New York City real estate market in particular;

• dependence upon certain geographic markets;

• risks of real estate acquisitions, dispositions, developments and redevelopment, including the cost of construction delays and cost overruns;

• risks relating to debt and preferred equity investments;

• availability and creditworthiness of prospective tenants and borrowers;

• bankruptcy or insolvency of a major tenant or a significant number of smaller tenants;

• adverse changes in the real estate markets, including reduced demand for office space, increasing vacancy, and increasing availability of sublease space;

• availability of capital (debt and equity);

• unanticipated increases in financing and other costs, including a rise in interest rates;

• our ability to comply with financial covenants in our debt instruments;

• our ability to maintain its status as a REIT;

• risks of investing through joint venture structures, including the fulfillment by our partners of their financial obligations;

• the threat of terrorist attacks;

• our ability to obtain adequate insurance coverage at a reasonable cost and the potential for losses in excess of our insurance coverage, including as a result of environmental contamination; and,

• legislative, regulatory and/or safety requirements adversely affecting REITs and the real estate business including costs of compliance with the Americans with Disabilities Act, the Fair Housing Act and other similar laws and regulations.

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Other factors and risks to our business, many of which are beyond our control, are described in other sections of this report and in our other filings with the SEC. We undertake no obligation to publicly update or revise any forward-looking statements, whether as a result of future events, new information or otherwise.

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ITEM 3.    QUANTITATIVE AND QUALITATIVE DISCLOSURE ABOUT MARKET RISK

For quantitative and qualitative disclosure about market risk, see Item 2, "Management's Discussion and Analysis of Financial Condition and Results of Operation - Market Risk" in this Quarterly Report on Form 10-Q for the three and nine months ended September 30, 2017 for the Company and the Operating Partnership and Item 7, "Management's Discussion and Analysis of Financial Condition and Results of Operations - Market Rate Risk" in the Annual Report on Form 10-K for the year ended December 31, 2016 for the Company and the Operating Partnership. Our exposures to market risk have not changed materially since December 31, 2016.

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ITEM 4.    CONTROLS AND PROCEDURES

SL GREEN REALTY CORP.

Evaluation of Disclosure Controls and Procedures

The Company maintains disclosure controls and procedures that are designed to ensure that information required to be disclosed in our Exchange Act reports is recorded, processed, summarized and reported within the time periods specified in the SEC's rules and forms, and that such information is accumulated and communicated to the Company's management, including the Company's Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure based closely on the definition of "disclosure controls and procedures" in Rule 13a-15(e) of the Exchange Act. Notwithstanding the foregoing, a control system, no matter how well designed and operated, can provide only reasonable, not absolute, assurance that it will detect or uncover failures within the Company to disclose material information otherwise required to be set forth in our periodic reports. Also, the Company has investments in certain unconsolidated entities. As the Company does not control these entities, its disclosure controls and procedures with respect to such entities are necessarily substantially more limited than those the Company maintains with respect to its consolidated subsidiaries.

As of the end of the period covered by this report, the Company carried out an evaluation, under the supervision and with the participation of the Company's management, including our Chief Executive Officer and our Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures. Based upon that evaluation as of the end of the period covered by this report, the Company's Chief Executive Officer and Chief Financial Officer concluded that its disclosure controls and procedures were effective to give reasonable assurances to the timely collection, evaluation and disclosure of information relating to the Company that would potentially be subject to disclosure under the Exchange Act and the rules and regulations promulgated thereunder.

Changes in Internal Control over Financial Reporting

There have been no significant changes in the Company's internal control over financial reporting during the quarter ended September 30, 2017 that has materially affected, or is reasonably likely to materially affect, its internal control over financial reporting.

SL GREEN OPERATING PARTNERSHIP, L.P.

Evaluation of Disclosure Controls and Procedures

The Company maintains disclosure controls and procedures that are designed to ensure that information required to be disclosed in our Exchange Act reports is recorded, processed, summarized and reported within the time periods specified in the SEC's rules and forms, and that such information is accumulated and communicated to the Company's management, including the Company's Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure based closely on the definition of "disclosure controls and procedures" in Rule 13a-15(e) of the Exchange Act. Notwithstanding the foregoing, a control system, no matter how well designed and operated, can provide only reasonable, not absolute, assurance that it will detect or uncover failures within the Company to disclose material information otherwise required to be set forth in our periodic reports. Also, the Company has investments in certain unconsolidated entities. As the Company does not control these entities, its disclosure controls and procedures with respect to such entities are necessarily substantially more limited than those the Company maintains with respect to its consolidated subsidiaries.

As of the end of the period covered by this report, the Company carried out an evaluation, under the supervision and with the participation of the Company's management, including our Chief Executive Officer and our Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures. Based upon that evaluation as of the end of the period covered by this report, the Company's Chief Executive Officer and Chief Financial Officer concluded that its disclosure controls and procedures were effective to give reasonable assurances to the timely collection, evaluation and disclosure of information relating to the Company that would potentially be subject to disclosure under the Exchange Act and the rules and regulations promulgated thereunder.

Changes in Internal Control over Financial Reporting

There have been no significant changes in the Operating Partnership's internal control over financial reporting during the quarter ended September 30, 2017 that has materially affected, or is reasonably likely to materially affect, its internal control over financial reporting.

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PART II. OTHER INFORMATION

ITEM 1.    LEGAL PROCEEDINGS

As of September 30, 2017, the Company and the Operating Partnership were not involved in any material litigation nor, to management's knowledge, was any material litigation threatened against us or our portfolio which if adversely determined could have a material adverse impact on us.

ITEM 1A.    RISK FACTORS

As of September 30, 2017 there have been no material changes to the Risk Factors disclosed in "Part I. Item 1A. Risk Factors" in the Company's Annual Report on Form 10-K for the year ended December 31, 2016.

ITEM 2.    UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

During the three months ended September 30, 2017 the Operating Partnership issued no units of limited partnership interest in connection with anacquisition. SL Green may satisfy redemption requests for the units issued in the transaction described above with shares of SL Green’s common stock, on a one-for- one basis, pursuant to the Operating Partnership agreement. The units were issued in reliance on the exemption from registration provided by Section 4(a)(2) of the Securities Act of 1933, as amended.

In August 2016, our board of directors approved a stock repurchase plan under which we can buy up to $1.0 billion shares of our common stock. At September 30, 2017 repurchases made under the stock repurchase plans were as follows:

Period	Total number of shares purchased	Average price paid per share	Total number of shares purchased as part of the repurchase plan or programs	Maximum approximate dollar value of shares that may yet be purchased under the plan (in millions)
First quarter 2017	982	$103.89	982	$999.9
Second quarter 2017	2,447,153	$103.41	2,448,135	$746.8
Third quarter 2017	951,866	$101.67	3,400,001	$650.0

ITEM 3.    DEFAULTS UPON SENIOR SECURITIES

None.

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ITEM 4. MINE SAFETY DISCLOSURES

Not Applicable.

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ITEM 5.   OTHER INFORMATION

None.

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ITEM 6.   EXHIBITS

31.1	Certification by the Chief Executive Officer of the Company pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, filed herewith.
31.2	Certification by the Chief Financial Officer of the Company pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, filed herewith.
31.3	Certification by the Chief Executive Officer of the Company, the sole general partner of the Operating Partnership pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, filed herewith.
31.4	Certification by the Chief Financial Officer of the Company, the sole general partner of the Operating Partnership pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, filed herewith.
32.1	Certification by the Chief Executive Officer pursuant to 18 U.S.C. section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, filed herewith.
32.2	Certification by the Chief Financial Officer pursuant to 18 U.S.C. section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, filed herewith.
32.3	Certification by the Chief Executive Officer of the Company, the sole general partner of the Operating Partnership pursuant to 18 U.S.C. section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, filed herewith.
32.4	Certification by the Chief Financial Officer of the Company, the sole general partner of the Operating Partnership pursuant to 18 U.S.C. section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, filed herewith.
101.10	The following financial statements from SL Green Realty Corp. and SL Green Operating Partnership L.P.’s Quarterly Report on Form 10-Q for the three months ended September 30, 2017, formatted in XBRL: (i) Consolidated Balance Sheets (unaudited), (ii) Consolidated Statements of Operations (unaudited), (iii) Consolidated Statements of Comprehensive Income (unaudited), (iv) Consolidated Statement of Equity (unaudited), (v) Consolidated Statement of Capital (unaudited) (vi) Consolidated Statements of Cash Flows (unaudited), and (vii) Notes to Consolidated Financial Statements (unaudited), detail tagged and filed herewith.

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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	SL GREEN REALTY CORP.
	By:	SL Green Realty Corp.
		/s/ Matthew J. DiLiberto
Dated: November 8, 2017	By:	Matthew J. DiLiberto Chief Financial Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated:

Signatures	Title	Date
/s/ Stephen L. Green	Chairman of the Board of Directors of SL Green, the sole general partner of the Operating Partnership	November 8, 2017
Stephen L. Green
/s/ Marc Holliday	Chief Executive Officer and Director of SL Green, the sole general partner of the Operating Partnership (Principal Executive Officer)	November 8, 2017
Marc Holliday
/s/ Andrew W. Mathias	President and Director of SL Green, the sole general partner of the Operating Partnership	November 8, 2017
Andrew W. Mathias
/s/ Matthew J. DiLiberto	Chief Financial Officer of SL Green, the sole general partner of the Operating Partnership (Principal Financial and Accounting Officer)	November 8, 2017
Matthew J. DiLiberto
/s/ John H. Alschuler, Jr.	Director of SL Green, the sole general partner of the Operating Partnership	November 8, 2017
John H. Alschuler, Jr.
/s/ Edwin T. Burton, III	Director of SL Green, the sole general partner of the Operating Partnership	November 8, 2017
Edwin T. Burton, III
/s/ John S. Levy	Director of SL Green, the sole general partner of the Operating Partnership	November 8, 2017
John S. Levy
/s/ Craig M. Hatkoff	Director of SL Green, the sole general partner of the Operating Partnership	November 8, 2017
Craig M. Hatkoff
/s/ Betsy S. Atkins	Director of SL Green, the sole general partner of the Operating Partnership	November 8, 2017
Betsy S. Atkins
/s/ Lauren B. Dillard	Director of SL Green, the sole general partner of the Operating Partnership	November 8, 2017
Lauren B. Dillard

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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	SL GREEN OPERATING PARTNERSHIP, L.P.
	By:	/s/ Matthew J. DiLiberto
Dated: November 8, 2017		Matthew J. DiLiberto Chief Financial Officer

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EX-31.1

Exhibit 31.1

CERTIFICATION

I, Marc Holliday, certify that:

1. I have reviewed this quarterly report on Form 10-Q of SL Green Realty Corp. (the “registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 8, 2017
	/s/ Marc Holliday
Name:	Marc Holliday
Title:	Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Matthew J. DiLiberto, certify that:

1. I have reviewed this quarterly report on Form 10-Q of SL Green Realty Corp. (the “registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 8, 2017
	/s/ Matthew J. DiLiberto
Name:	Matthew J. DiLiberto
Title:	Chief Financial Officer

EX-31.3

Exhibit 31.3

CERTIFICATION

I, Marc Holliday, certify that:

1. I have reviewed this quarterly report on Form 10-Q of SL Green Operating Partnership, L.P. (the “registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 8, 2017
	/s/ Marc Holliday
Name:	Marc Holliday
Title:	Chief Executive Officer
	of SL Green Realty Corp., the
	general partner of the registrant

EX-31.4

Exhibit 31.4

CERTIFICATION

I, Matthew J. DiLiberto, certify that:

1. I have reviewed this quarterly report on Form 10-Q of SL Green Operating Partnership, L.P. (the “registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

	/s/ Matthew J. DiLiberto
Name:	Matthew J. DiLiberto
Title:	Chief Financial Officer
	of SL Green Realty Corp., the
	general partner of the registrant
November 8, 2017

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of SL Green Realty Corp. (the “Company”) on Form 10-Q as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Marc Holliday, Chief Executive Officer of the Company, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

	/s/ Marc Holliday
Name:	Marc Holliday
Title:	Chief Executive Officer
November 8, 2017

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of SL Green Realty Corp. (the “Company”) on Form 10-Q as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Matthew J. DiLiberto, Chief Financial Officer of the Company, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

	/s/ Matthew J. DiLiberto
Name:	Matthew J. DiLiberto
Title:	Chief Financial Officer
November 8, 2017

EX-32.3

Exhibit 32.3

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of SL Green Operating Partnership, L.P. (the “Operating Partnership”) on Form 10-Q as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Marc Holliday, Chief Executive Officer of SL Green Realty Corp, the sole general partner of the Operating Partnership, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Operating Partnership.

	/s/ Marc Holliday
Name:	Marc Holliday
Title:	Chief Executive Officer
	of SL Green Realty Corp., the
	general partner of the Operating Partnership
November 8, 2017

EX-32.4

Exhibit 32.4

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of SL Green Operating Partnership, L.P. (the “Operating Partnership”) on Form 10-Q as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Matthew J. DiLiberto, Chief Financial Officer of SL Green Realty Corp, the sole general partner of the Operating Partnership, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Operating Partnership.

	/s/ Matthew J. DiLiberto
Name:	Matthew J. DiLiberto
Title:	Chief Financial Officer
	of SL Green Realty Corp., the
	general partner of the Operating Partnership
November 8, 2017

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Nov. 07, 2017
Document Information [Line Items]
Entity Registrant Name	SL GREEN REALTY CORP
Entity Central Index Key	0001040971
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		98,265,715
SL Green Operating Partnership
Document Information [Line Items]
Entity Registrant Name	SL GREEN OPERATING PARTNERSHIP, LP.
Entity Central Index Key	0001492869
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		1,497,224

XML

Consolidated Balance Sheets - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016
Commercial real estate properties, at cost:
Land and land interests		$ 2,917,993	$ 3,309,710
Building and improvements		7,468,436	7,948,852
Building leasehold and improvements		1,444,698	1,437,325
Properties under capital lease		47,445	47,445
Total commercial real estate properties, at cost		11,878,572	12,743,332
Less: accumulated depreciation		(2,457,071)	(2,264,694)
Total commercial real estate properties, net		9,421,501	10,478,638
Assets held for sale		127,663	0
Cash and cash equivalents		241,489	279,443
Restricted cash		107,763	90,524
Investments in marketable securities		28,802	85,110
Tenant and other receivables, net of allowance of $18,365 and $16,592 in 2017 and 2016, respectively		54,663	53,772
Related party receivables		24,068	15,856
Deferred rents receivable, net of allowance of $21,257 and $25,203 in 2017 and 2016, respectively		393,793	442,179
Debt and preferred equity investments, net of discounts and deferred origination fees of $24,782 and $16,705 in 2017 and 2016, respectively		2,020,739	1,640,412
Investments in unconsolidated joint ventures		2,045,796	1,890,186
Deferred costs, net		247,981	267,600
Other assets		395,612	614,067
Total assets	[1]	15,109,870	15,857,787
Liabilities
Mortgages and other loans payable, net		3,804,174	4,073,830
Revolving credit facility, net		275,832	0
Unsecured term loan, net		1,180,506	1,179,521
Unsecured notes, net		1,064,544	1,128,315
Accrued interest payable		34,367	36,052
Other liabilities		95,718	206,238
Accounts payable and accrued expenses		144,767	190,583
Deferred revenue		252,779	217,955
Capital lease obligations		42,660	42,132
Deferred land leases payable		3,075	2,583
Dividend and distributions payable		85,007	87,271
Security deposits		68,465	66,504
Liabilities related to assets held for sale		1,141	0
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities		100,000	100,000
Total liabilities	[1]	7,153,035	7,330,984
Commitments and contingencies
Noncontrolling interests in Operating Partnership		470,898	473,882
Preferred units		301,885	302,010
Equity
Series I Preferred Stock, $0.01 par value, $25.00 liquidation preference, 9,200 issued and outstanding at both September 30, 2017 and December 31, 2016		221,932	221,932
Common stock, $0.01 par value, 160,000 shares authorized and 98,501 and 101,617 issued and outstanding at September 30, 2017 and December 31, 2016, respectively (including 1,055 shares held in treasury at September 30, 2017 and December 31, 2016)		985	1,017
Additional paid-in-capital		5,294,500	5,624,545
Treasury stock at cost		(124,049)	(124,049)
Accumulated other comprehensive income		14,185	22,137
Retained earnings		1,410,332	1,578,893
Total SL Green stockholders' equity		6,817,885	7,324,475
Noncontrolling interests in other partnerships		366,167	426,436
Total equity		7,184,052	7,750,911
SL Green stockholders equity:
Total liabilities and equity/capital		15,109,870	15,857,787
SL Green Operating Partnership
Commercial real estate properties, at cost:
Land and land interests		2,917,993	3,309,710
Building and improvements		7,468,436	7,948,852
Building leasehold and improvements		1,444,698	1,437,325
Properties under capital lease		47,445	47,445
Total commercial real estate properties, at cost		11,878,572	12,743,332
Less: accumulated depreciation		(2,457,071)	(2,264,694)
Total commercial real estate properties, net		9,421,501	10,478,638
Assets held for sale		127,663	0
Cash and cash equivalents		241,489	279,443
Restricted cash		107,763	90,524
Investments in marketable securities		28,802	85,110
Tenant and other receivables, net of allowance of $18,365 and $16,592 in 2017 and 2016, respectively		54,663	53,772
Related party receivables		24,068	15,856
Deferred rents receivable, net of allowance of $21,257 and $25,203 in 2017 and 2016, respectively		393,793	442,179
Debt and preferred equity investments, net of discounts and deferred origination fees of $24,782 and $16,705 in 2017 and 2016, respectively		2,020,739	1,640,412
Investments in unconsolidated joint ventures		2,045,796	1,890,186
Deferred costs, net		247,981	267,600
Other assets		395,612	614,067
Total assets	[2]	15,109,870	15,857,787
Liabilities
Mortgages and other loans payable, net		3,804,174	4,073,830
Revolving credit facility, net		275,832	0
Unsecured term loan, net		1,180,506	1,179,521
Unsecured notes, net		1,064,544	1,128,315
Accrued interest payable		34,367	36,052
Other liabilities		95,718	206,238
Accounts payable and accrued expenses		144,767	190,583
Deferred revenue		252,779	217,955
Capital lease obligations		42,660	42,132
Deferred land leases payable		3,075	2,583
Dividend and distributions payable		85,007	87,271
Security deposits		68,465	66,504
Liabilities related to assets held for sale		1,141	0
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities		100,000	100,000
Total liabilities	[2]	7,153,035	7,330,984
Commitments and contingencies
Noncontrolling interests in Operating Partnership		470,898	473,882
Limited partner interests in SLGOP (4,542 and 4,364 limited partner common units outstanding at September 30, 2017 and December 31, 2016, respectively)		470,898	473,882
Preferred units		301,885	302,010
Equity
Accumulated other comprehensive income		14,185	22,137
SL Green stockholders equity:
Series I Preferred Units, $25.00 liquidation preference, 9,200 issued and outstanding at both September 30, 2017 and December 31, 2016		221,932	221,932
SL Green partners' capital (1,020 and 1,049 general partner common units and 96,426 and 99,513 limited partner common units outstanding at September 30, 2017 and December 31, 2016, respectively)		6,581,768	7,080,406
Total SLGOP partners' capital		6,817,885	7,324,475
Noncontrolling interests in other partnerships		366,167	426,436
Total capital		7,184,052	7,750,911
Total liabilities and equity/capital		$ 15,109,870	$ 15,857,787

[1] The Company's consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs"). See Note 2. The consolidated balance sheets include the following amounts related to our consolidated VIEs, excluding the Operating Partnership: $384.3 million and $412.3 million of land, $1.4 billion and $1.5 billion of building and improvements, $2.0 million and $2.0 million of building and leasehold improvements, $47.4 million and $47.4 million of properties under capital lease, $323.3 million and $327.2 million of accumulated depreciation, $235.4 million and $244.2 million of other assets included in other line items, $627.8 million and $621.8 million of real estate debt, net, $2.5 million and $2.2 million of accrued interest payable, $42.7 million and $42.1 million of capital lease obligations, and $58.5 million and $73.3 million of other liabilities included in other line items as of September 30, 2017 and December 31, 2016, respectively.

[2] The Operating Partnership's consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs"). See Note 2. The consolidated balance sheets include the following amounts related to our consolidated VIEs: $384.3 million and $412.3 million of land, $1.4 billion and $1.5 billion of building and improvements, $2.0 million and $2.0 million of building and leasehold improvements, $47.4 million and $47.4 million of properties under capital lease, $323.3 million and $327.2 million of accumulated depreciation, $235.4 million and $244.2 million of other assets included in other line items, $627.8 million and $621.8 million of real estate debt, net, $2.5 million and $2.2 million of accrued interest payable, $42.7 million and $42.1 million of capital lease obligations, and $58.5 million and $73.3 million of other liabilities included in other line items as of September 30, 2017 and December 31, 2016, respectively.

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Tenant and other receivables, allowance	$ 18,365	$ 16,592
Deferred rents receivable, allowance	21,257	25,203
Debt and preferred equity investments, discount and deferred origination fees	$ 24,782	$ 16,705
Preferred stock, par value (in dollars per share)	$ 0.01
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	160,000,000	160,000,000
Common stock, shares issued (in shares)	98,501,000	101,617,000
Common stock, shares outstanding (in shares)	98,501,000	101,617,000
Treasury stock, shares (in shares)	1,055,000	1,055,000
Land and land interests	$ 2,917,993	$ 3,309,710
Building and improvements	7,468,436	7,948,852
Building leasehold and improvements	1,444,698	1,437,325
Properties under capital lease	47,445	47,445
Accumulated depreciation	2,457,071	2,264,694
Other assets	395,612	614,067
Mortgages and other loans payable, net	3,804,174	4,073,830
Accrued interest payable	34,367	36,052
Capital lease obligations	42,660	42,132
Other liabilities	$ 95,718	$ 206,238
Series I Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, liquidation preference (in dollars per share)	$ 25.00	$ 25.00
Preferred stock, shares issued (in shares)	9,200,000	9,200,000
Preferred stock, shares outstanding (in shares)	9,200,000	9,200,000
Consolidated VIEs
Land and land interests	$ 384,300	$ 412,300
Building and improvements	1,400,000	1,500,000
Building leasehold and improvements	2,000	2,000
Properties under capital lease	47,400	47,400
Accumulated depreciation	323,300	327,200
Other assets	235,400	244,200
Mortgages and other loans payable, net	627,800	621,800
Accrued interest payable	2,500	2,200
Capital lease obligations	42,700	42,100
Other liabilities	58,500	73,300
SL Green Operating Partnership
Tenant and other receivables, allowance	18,365	16,592
Deferred rents receivable, allowance	21,257	25,203
Debt and preferred equity investments, discount and deferred origination fees	$ 24,782	$ 16,705
Limited partner interests in Operating Partnership, limited partner common units outstanding (shares)	4,542,000	4,364,000
SL Green partner's capital, general partner common units outstanding (shares)	1,020,000	1,049,000
SL Green partners' capital, limited partner common units outstanding (shares)	96,426,000	99,513,000
Land and land interests	$ 2,917,993	$ 3,309,710
Building and improvements	7,468,436	7,948,852
Building leasehold and improvements	1,444,698	1,437,325
Properties under capital lease	47,445	47,445
Accumulated depreciation	2,457,071	2,264,694
Other assets	395,612	614,067
Mortgages and other loans payable, net	3,804,174	4,073,830
Accrued interest payable	34,367	36,052
Capital lease obligations	42,660	42,132
Other liabilities	$ 95,718	$ 206,238
SL Green Operating Partnership | Series I Preferred Stock
Preferred units, liquidation preference (in dollars per share)	$ 25.00	$ 25.00
Preferred units, shares issued	9,200,000	9,200,000
Preferred units, shares outstanding	9,200,000	9,200,000
SL Green Operating Partnership | Consolidated VIEs
Land and land interests	$ 384,300	$ 412,300
Building and improvements	1,400,000	1,500,000
Building leasehold and improvements	2,000	2,000
Properties under capital lease	47,400	47,400
Accumulated depreciation	323,300	327,200
Other assets	235,400	244,200
Mortgages and other loans payable, net	267,800	621,800
Accrued interest payable	2,500	2,200
Capital lease obligations	42,700	42,100
Other liabilities	$ 58,500	$ 73,300

XML

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

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Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating expenses, paid to related parties	$ 5,505	$ 5,042	$ 14,941	$ 15,171
SL Green Operating Partnership
Operating expenses, paid to related parties	$ 5,505	$ 5,042	$ 14,941	$ 15,171

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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net income	$ 45,795	$ 43,343	$ 62,734	$ 224,941
Other comprehensive loss:
Change in net unrealized gain on derivative instruments, including SL Green's/SLGOP's share of joint venture net unrealized (loss) gain on derivative instruments	(217)	2,632	(3,812)	(4,682)
Change in unrealized gain on marketable securities	44	(30)	(4,443)	(900)
Other comprehensive (loss) income	(173)	2,602	(8,255)	(5,582)
Comprehensive income	45,622	45,945	54,479	219,359
Net (income) loss attributable to noncontrolling interests and preferred units distributions	(3,188)	(5,353)	6,921	(22,798)
Net loss (income) attributable to noncontrolling interests	1,474	(836)	18,179	(6,245)
Other comprehensive loss attributable to noncontrolling interests	4	(118)	303	257
Comprehensive income attributable to SL Green/SLGOP	42,438	40,474	61,703	196,818
SL Green Operating Partnership
Net income	45,795	43,343	62,734	224,941
Other comprehensive loss:
Change in net unrealized gain on derivative instruments, including SL Green's/SLGOP's share of joint venture net unrealized (loss) gain on derivative instruments	(217)	2,632	(3,812)	(4,682)
Change in unrealized gain on marketable securities	44	(30)	(4,443)	(900)
Other comprehensive (loss) income	(173)	2,602	(8,255)	(5,582)
Comprehensive income	45,622	45,945	54,479	219,359
Net loss (income) attributable to noncontrolling interests	1,474	(836)	18,179	(6,245)
Other comprehensive loss attributable to noncontrolling interests	4	(118)	303	257
Comprehensive income attributable to SL Green/SLGOP	$ 47,100	$ 44,991	$ 72,961	$ 213,371

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Consolidated Statement of Equity (Unaudited) - 9 months ended Sep. 30, 2017 - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-In-Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Noncontrolling Interests
Beginning Balance at Dec. 31, 2016	$ 7,750,911	$ 221,932	$ 1,017	$ 5,624,545	$ (124,049)	$ 22,137	$ 1,578,893	$ 426,436
Beginning Balance (in shares) at Dec. 31, 2016			100,562
Increase (Decrease) in Stockholders' Equity
Net income (loss)	51,476						69,655	(18,179)
Other comprehensive loss	(7,952)					(7,952)
Preferred dividends	(11,213)						(11,213)
DRSPP proceeds (in shares)			2
DRSPP proceeds	185			185
Conversion of units of the Operating Partnership to common stock (in shares)			142
Conversion of units of the Operating Partnership to common stock	15,353		$ 1	15,352
Reallocation of noncontrolling interest in the Operating Partnership	2,669						2,669
Equity component of repurchased exchangeable senior notes	(27,969)			(27,969)
Deferred compensation plan and stock awards, net (in shares)			(6)
Deferred compensation plan and stock awards, net	(1,959)			(1,959)
Amortization of deferred compensation plan	22,014			22,014
Repurchases of common stock (in shares)			(3,400)
Repurchases of common stock	(349,991)		$ (34)	(349,957)
Proceeds from stock options exercised (in shares)			146
Proceeds from stock options exercised	12,290		$ 1	12,289
Contributions to consolidated joint venture interests	33,202							33,202
Deconsolidation of partially owned entity	(30,203)							(30,203)
Cash distributions to noncontrolling interests	(45,089)							(45,089)
Cash distributions declared ($2.325 per common share, none of which represented a return of capital for federal income tax purposes)	(229,672)						(229,672)
Ending Balance at Sep. 30, 2017	$ 7,184,052	$ 221,932	$ 985	$ 5,294,500	$ (124,049)	$ 14,185	$ 1,410,332	$ 366,167
Ending Balance (in shares) at Sep. 30, 2017			97,446

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Consolidated Statement of Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Stockholders' Equity [Abstract]
Cash distribution declared, per common share (in dollars per share)	$ 0.775	$ 0.72	$ 2.325	$ 2.16

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Consolidated Statement of Capital (Unaudited) shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($) shares
Increase (Decrease) in Partner's Capital
DRSPP proceeds	$ 185
Conversion of common units	15,353
Reallocation of noncontrolling interests in the operating partnership	2,669
Equity component of repurchased exchangeable senior notes	(27,969)
Deferred compensation plan and stock awards, net	(1,959)
Amortization of deferred compensation plan	22,014
Repurchases of common stock	(349,991)
Contribution to consolidated joint venture interests	33,202
Deconsolidation of partially owned entity	(30,203)
Cash distributions to noncontrolling interests	$ (45,089)
Common Stock
Increase (Decrease) in Partner's Capital
DRSPP proceeds (in shares) | shares	2
Conversion of common units	$ 1
Deferred compensation plan and stock awards, net (in shares) | shares	(6)
Repurchases of common stock (in shares) | shares	(3,400)
Repurchases of common stock	$ (34)
Contributions - proceeds from stock options exercised (in shares) | shares	146
Noncontrolling Interests
Increase (Decrease) in Partner's Capital
Contribution to consolidated joint venture interests	$ 33,202
Deconsolidation of partially owned entity	(30,203)
Cash distributions to noncontrolling interests	(45,089)
SL Green Operating Partnership
Increase (Decrease) in Partner's Capital
Beginning Balance	7,750,911
Net income (loss)	51,476
Other comprehensive loss	(7,952)
Preferred distributions	(11,213)
DRSPP proceeds	185
Conversion of common units	15,353
Reallocation of noncontrolling interests in the operating partnership	2,669
Equity component of repurchased exchangeable senior notes	(27,969)
Deferred compensation plan and stock awards, net	(1,959)
Amortization of deferred compensation plan	22,014
Repurchases of common stock	(349,991)
Contribution to consolidated joint venture interests	33,202
Deconsolidation of partially owned entity	(30,203)
Contributions - proceeds from stock options exercised	12,290
Cash distributions to noncontrolling interests	(45,089)
Cash distributions declared ($2.325 per common unit, none of which represented a return of capital for federal income tax purposes)	(229,672)
Ending Balance	7,184,052
SL Green Operating Partnership | Preferred Units
Increase (Decrease) in Partner's Capital
Beginning Balance	221,932
Ending Balance	221,932
SL Green Operating Partnership | Common Stock | Partners' Interest
Increase (Decrease) in Partner's Capital
Beginning Balance	$ 7,080,406
Beginning Balance (units) | shares	100,562
Net income (loss)	$ 69,655
Preferred distributions	$ (11,213)
DRSPP proceeds (in shares) | shares	2
DRSPP proceeds	$ 185
Conversion of common units (in shares) | shares	142
Conversion of common units	$ 15,353
Reallocation of noncontrolling interests in the operating partnership	2,669
Equity component of repurchased exchangeable senior notes	$ (27,969)
Deferred compensation plan and stock awards, net (in shares) | shares	(6)
Deferred compensation plan and stock awards, net	$ (1,959)
Amortization of deferred compensation plan	$ 22,014
Repurchases of common stock (in shares) | shares	(3,400)
Repurchases of common stock	$ (349,991)
Contributions - proceeds from stock options exercised (in shares) | shares	146
Contributions - proceeds from stock options exercised	$ 12,290
Cash distributions declared ($2.325 per common unit, none of which represented a return of capital for federal income tax purposes)	(229,672)
Ending Balance	$ 6,581,768
Ending Balance (units) | shares	97,446
SL Green Operating Partnership | Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Partner's Capital
Beginning Balance	$ 22,137
Other comprehensive loss	(7,952)
Ending Balance	14,185
SL Green Operating Partnership | Noncontrolling Interests
Increase (Decrease) in Partner's Capital
Beginning Balance	426,436
Net income (loss)	(18,179)
Contribution to consolidated joint venture interests	33,202
Deconsolidation of partially owned entity	(30,203)
Cash distributions to noncontrolling interests	(45,089)
Ending Balance	$ 366,167

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Consolidated Statement of Capital (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Cash distribution declared, per common share (in dollars per share)	$ 0.775	$ 0.72	$ 2.325	$ 2.16
SL Green Operating Partnership
Cash distribution declared, per common share (in dollars per share)	$ 0.775	$ 0.72	$ 2.325	$ 2.16

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Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Operating Activities
Net income		$ 62,734	$ 224,941
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		331,117	737,195
Equity in net income from unconsolidated joint ventures		(14,104)	(11,969)
Distributions of cumulative earnings from unconsolidated joint ventures		19,609	19,311
Equity in net gain on sale of interest in unconsolidated joint venture interest/real estate		(16,166)	(43,588)
Depreciable real estate reserves		85,336	10,387
Loss (gain) on sale of real estate, net		3,256	(210,750)
(Gain) loss on sale of investments in marketable securities		(3,262)	83
Deferred rents receivable		(33,523)	40,056
Other non-cash adjustments	[1]	18,423	(155,558)
Changes in operating assets and liabilities:
Restricted cash—operations		6,520	(12,855)
Tenant and other receivables		(2,318)	2,714
Related party receivables		(8,238)	(4,167)
Deferred lease costs		(31,479)	(47,036)
Other assets		(58,068)	(30,899)
Accounts payable, accrued expenses, other liabilities and security deposits		1,423	(28,089)
Deferred revenue and land leases payable		55,361	19,016
Net cash provided by operating activities		416,621	508,792
Investing Activities
Acquisitions of real estate property		(25,114)	(38,005)
Additions to land, buildings and improvements		(251,158)	(269,182)
Escrowed cash—capital improvements/acquisition deposits/deferred purchase price		17,431	85,983
Investments in unconsolidated joint ventures		(112,697)	(69,422)
Distributions in excess of cumulative earnings from unconsolidated joint ventures		279,478	171,472
Net proceeds from disposition of real estate/joint venture interest		116,983	2,419,841
Proceeds from sale or redemption of marketable securities		55,129	6,868
Purchases of marketable securities		0	(23,062)
Other investments		46,955	8,232
Origination of debt and preferred equity investments		(935,724)	(554,803)
Repayments or redemption of debt and preferred equity investments		707,676	667,251
Net cash (used in) provided by investing activities		(101,041)	2,405,173
Financing Activities
Proceeds from mortgages and other loans payable		779,650	256,207
Repayments of mortgages and other loans payable		(706,056)	(1,786,034)
Proceeds from revolving credit facility and senior unsecured notes		1,447,800	1,260,300
Repayments of revolving credit facility and senior unsecured notes		(1,270,804)	(2,269,604)
Proceeds from stock options exercised and DRIP issuance		12,475	12,404
Repurchase of common stock		(349,991)	0
Redemption of preferred stock		(125)	(2,999)
Distributions to noncontrolling interests in other partnerships		(45,089)	(11,023)
Contributions from noncontrolling interests in other partnerships		33,202	2,019
Distributions to noncontrolling interests in the Operating Partnership		(10,639)	(9,245)
Dividends / Distributions paid on common and preferred stock / units		(251,701)	(234,801)
Other obligations related to loan participations		16,737	59,150
Deferred loan costs and capitalized lease obligation		(8,993)	(39,842)
Net cash used in financing activities		(353,534)	(2,763,468)
Net (decrease) increase in cash and cash equivalents		(37,954)	150,497
Cash and cash equivalents at beginning of year		279,443	255,399
Cash and cash equivalents at end of period		241,489	405,896
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Issuance of units in the Operating Partnership		23,273	51,647
Redemption of units in the Operating Partnership for stock		15,352	12,746
Derivative instruments at fair value		7,362	0
Exchange of debt investment for equity in joint venture		0	68,581
Issuance of preferred units relating to a real estate acquisition		0	22,793
Tenant improvements and capital expenditures payable		8,926	4,281
Fair value adjustment to noncontrolling interest in Operating Partnership		2,669	4,959
Deconsolidation of subsidiaries		328,643	1,173,570
Transfer of assets related to assets held for sale		273,455	2,048,376
Transfer of liabilities related to assets held for sale		1,290	1,677,528
Deferred leasing payable		810	1,208
Transfer of assets related to assets held for sale		11,158	22,179
Issuance of SLG's common stock to consolidated joint venture		0
SL Green Operating Partnership
Operating Activities
Net income		62,734	224,941
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		331,117	737,195
Equity in net income from unconsolidated joint ventures		(14,104)	(11,969)
Distributions of cumulative earnings from unconsolidated joint ventures		19,609	19,311
Equity in net gain on sale of interest in unconsolidated joint venture interest/real estate		(16,166)	(43,588)
Depreciable real estate reserves		85,336	10,387
Loss (gain) on sale of real estate, net		3,256	(210,750)
(Gain) loss on sale of investments in marketable securities		(3,262)	83
Deferred rents receivable		(33,523)	40,056
Other non-cash adjustments	[1]	18,423	(155,558)
Changes in operating assets and liabilities:
Restricted cash—operations		6,520	(12,855)
Tenant and other receivables		(2,318)	2,714
Related party receivables		(8,238)	(4,167)
Deferred lease costs		(31,479)	(47,036)
Other assets		(58,068)	(30,899)
Accounts payable, accrued expenses, other liabilities and security deposits		1,423	(28,089)
Deferred revenue and land leases payable		55,361	19,016
Net cash provided by operating activities		416,621	508,792
Investing Activities
Acquisitions of real estate property		(25,114)	(38,005)
Additions to land, buildings and improvements		(251,158)	(269,182)
Escrowed cash—capital improvements/acquisition deposits/deferred purchase price		17,431	85,983
Investments in unconsolidated joint ventures		(112,697)	(69,422)
Distributions in excess of cumulative earnings from unconsolidated joint ventures		279,478	171,472
Net proceeds from disposition of real estate/joint venture interest		116,983	2,419,841
Proceeds from sale or redemption of marketable securities		55,129	6,868
Purchases of marketable securities		0	(23,062)
Other investments		46,955	8,232
Origination of debt and preferred equity investments		(935,724)	(554,803)
Repayments or redemption of debt and preferred equity investments		707,676	667,251
Net cash (used in) provided by investing activities		(101,041)	2,405,173
Financing Activities
Proceeds from mortgages and other loans payable		779,650	256,207
Repayments of mortgages and other loans payable		(706,056)	(1,786,034)
Proceeds from revolving credit facility and senior unsecured notes		1,447,800	1,260,300
Repayments of revolving credit facility and senior unsecured notes		(1,270,804)	(2,269,604)
Proceeds from stock options exercised and DRIP issuance		12,475	12,404
Repurchase of common stock		(349,991)	0
Redemption of preferred stock		(125)	(2,999)
Distributions to noncontrolling interests in other partnerships		(45,089)	(11,023)
Contributions from noncontrolling interests in other partnerships		33,202	2,019
Dividends / Distributions paid on common and preferred stock / units		(262,340)	(244,046)
Other obligations related to loan participations		16,737	59,150
Deferred loan costs and capitalized lease obligation		(8,993)	(39,842)
Net cash used in financing activities		(353,534)	(2,763,468)
Net (decrease) increase in cash and cash equivalents		(37,954)	150,497
Cash and cash equivalents at beginning of year		279,443	255,399
Cash and cash equivalents at end of period		241,489	405,896
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Issuance of units in the Operating Partnership		23,273	51,647
Redemption of units in the Operating Partnership for stock		15,352	12,746
Derivative instruments at fair value		7,362	0
Exchange of debt investment for equity in joint venture		0	68,581
Issuance of preferred units relating to a real estate acquisition		0	22,793
Tenant improvements and capital expenditures payable		8,926	4,281
Fair value adjustment to noncontrolling interest in Operating Partnership		2,669	4,959
Deconsolidation of subsidiaries		328,643	1,173,570
Transfer of assets related to assets held for sale		273,455	2,048,376
Transfer of liabilities related to assets held for sale		1,290	1,677,528
Deferred leasing payable		810	1,208
Transfer of assets related to assets held for sale		$ 11,158	$ 22,179

[1] Included in Other non-cash adjustments is $172.4 million for the nine months ended September 30, 2016 for the amortization of the below-market lease at 388-390 Greenwich Street as a result of the tenant exercising their option to purchase the property and entering into an agreement to accelerate the sale.

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Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - 388-390 Greenwich Street $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($)
Amortization of below market lease	$ 172.4
SL Green Operating Partnership
Amortization of below market lease	$ 172.4

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Organization and Basis of Presentation

9 Months Ended

Sep. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Basis of Presentation

Organization and Basis of Presentation

SL Green Realty Corp., which is referred to as the Company or SL Green, a Maryland corporation, and SL Green Operating Partnership, L.P., which is referred to as SLGOP or the Operating Partnership, a Delaware limited partnership, were formed in June 1997 for the purpose of combining the commercial real estate business of S.L. Green Properties, Inc. and its affiliated partnerships and entities. The Operating Partnership received a contribution of interest in the real estate properties, as well as 95% of the economic interest in the management, leasing and construction companies which are referred to as the Service Corporation. All of the management, leasing and construction services that are provided to the properties that are wholly-owned by us and that are provided to certain joint ventures are conducted through SL Green Management LLC which is 100% owned by the Operating Partnership. The Company has qualified, and expects to qualify in the current fiscal year, as a real estate investment trust, or REIT, under the Internal Revenue Code of 1986, as amended, or the Code, and operates as a self-administered, self-managed REIT. A REIT is a legal entity that holds real estate interests and, through payments of dividends to stockholders, is permitted to minimize the payment of Federal income taxes at the corporate level. Unless the context requires otherwise, all references to "we," "our" and "us" means the Company and all entities owned or controlled by the Company, including the Operating Partnership.

Substantially all of our assets are held by, and all of our operations are conducted through, the Operating Partnership. The Company is the sole managing general partner of the Operating Partnership. As of September 30, 2017, noncontrolling investors held, in the aggregate, a 4.45% limited partnership interest in the Operating Partnership. We refer to these interests as the noncontrolling interests in the Operating Partnership. The Operating Partnership is considered a variable interest entity, or VIE, in which we are the primary beneficiary. See Note 11, "Noncontrolling Interests on the Company's Consolidated Financial Statements".

Reckson Associates Realty Corp., or Reckson, and Reckson Operating Partnership, L.P., or ROP, are wholly-owned subsidiaries of SL Green Realty Corp.

As of September 30, 2017, we owned the following interests in properties in the New York Metropolitan area, primarily in midtown Manhattan. Our investments in the New York Metropolitan area also include investments in Brooklyn, Long Island, Westchester County, Connecticut and New Jersey, which are collectively known as the Suburban properties:

		Consolidated			Unconsolidated		Total
Location	Property Type	Number of Properties		Approximate Square Feet (unaudited)	Number of Properties	Approximate Square Feet (unaudited)	Number of Properties	Approximate Square Feet (unaudited)	Weighted Average Occupancy(1) (unaudited)
Commercial:
Manhattan	Office	24		16,054,606	7	6,558,139	31	22,612,745	93.4	%
	Retail	4	(2)	302,583	9	347,970	13	650,553	94.5	%
	Development/Redevelopment	7		158,985	4	770,514	11	929,499	59.9	%
	Fee Interest	1		176,530	1	—	2	176,530	100.0	%
		36		16,692,704	21	7,676,623	57	24,369,327	92.2	%
Suburban	Office	22	(3)(4)	3,608,800	2	640,000	24	4,248,800	83.1	%
	Retail	1		52,000	—	—	1	52,000	100.0	%
	Development/Redevelopment	1		1,000	1	—	2	1,000	100.0	%
		24		3,661,800	3	640,000	27	4,301,800	83.3	%
Total commercial properties		60		20,354,504	24	8,316,623	84	28,671,127	90.8	%
Residential:
Manhattan	Residential	3	(2)	472,105	12	2,656,856	15	3,128,961	86.4	%
Suburban	Residential	—		—	—	—	—	—	—	%
Total residential properties		3		472,105	12	2,656,856	15	3,128,961	86.4	%
Total portfolio(2)(3)		63		20,826,609	36	10,973,479	99	31,800,088	90.4	%

(1) The weighted average occupancy for commercial properties represents the total occupied square feet divided by total square footage at acquisition. The weighted average occupancy for residential properties represents the total occupied units divided by total available units.

(2) As of September 30, 2017, we owned a building at 315 West 33rd Street, also known as The Olivia, that was comprised of approximately 270,132 square feet (unaudited) of retail space and approximately 222,855 square feet (unaudited) of residential space. For the purpose of this report, we have included this building in the number of retail properties we own. However, we have included only the retail square footage in the retail approximate square footage, and have listed the balance of the square footage as residential square footage.

(3) Includes the properties at 16 Court Street in Brooklyn, New York, and 125 Chubb Avenue in Lyndhurst, New Jersey which are classified as held for sale at September 30, 2017. The sales closed in October 2017.

As of September 30, 2017, we also managed an approximately 336,000 square foot (unaudited) office building owned by a third party and held debt and preferred equity investments with a book value of $2.2 billion, including $0.1 billion of debt and preferred equity investments and other financing receivables that are included in other balance sheet line items other than the Debt and Preferred Equity Investments line item.

Partnership Agreement

In accordance with the partnership agreement of the Operating Partnership, or the Operating Partnership Agreement, we allocate all distributions and profits and losses in proportion to the percentage of ownership interests of the respective partners. As the managing general partner of the Operating Partnership, we are required to take such reasonable efforts, as determined by us in our sole discretion, to cause the Operating Partnership to distribute sufficient amounts to enable the payment of sufficient dividends by us to minimize any Federal income or excise tax at the Company level. Under the Operating Partnership Agreement, each limited partner has the right to redeem units of limited partnership interests for cash, or if we so elect, shares of SL Green's common stock on a one-for-one basis.

Basis of Quarterly Presentation

The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by accounting principles generally accepted in the United States for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for the fair presentation of the financial position of the Company and the Operating Partnership at September 30, 2017 and the results of operations for the periods presented have been included. The operating results for the period presented are not necessarily indicative of the results that may be expected for the year ending December 31, 2017. These financial statements should be read in conjunction with the financial statements and accompanying notes included in the Annual Report on Form 10-K for the year ended December 31, 2016 of the Company and the Operating Partnership.

The consolidated balance sheet at December 31, 2016 has been derived from the audited financial statements as of that date but do not include all the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

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Significant Accounting Policies

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Significant Accounting Policies

Significant Accounting Policies

Principles of Consolidation

The consolidated financial statements include our accounts and those of our subsidiaries, which are wholly-owned or controlled by us. Entities which we do not control through our voting interest and entities which are variable interest entities, but where we are not the primary beneficiary, are accounted for under the equity method. See Note 5, "Debt and Preferred Equity Investments" and Note 6, "Investments in Unconsolidated Joint Ventures." All significant intercompany balances and transactions have been eliminated.

We consolidate a variable interest entity, or VIE, in which we are considered the primary beneficiary. The primary beneficiary is the entity that has (i) the power to direct the activities that most significantly impact the entity's economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE.

Investment in Commercial Real Estate Properties

On a periodic basis, we assess whether there are any indications that the value of our real estate properties may be other than temporarily impaired or that their carrying value may not be recoverable. A property's value is considered impaired if management's estimate of the aggregate future cash flows (undiscounted) to be generated by the property is less than the carrying value of the property. To the extent impairment has occurred, the loss will be measured as the excess of the carrying amount of the property over the calculated fair value of the property. We also evaluate our real estate properties for potential impairment when a real estate property has been classified as held for sale. Real estate assets held for sale are valued at the lower of either their carrying value or fair value less costs to sell. We do not believe that there were any indicators of impairment at any of our consolidated properties at September 30, 2017. We recorded no depreciable real estate reserves for the three months ended September 30, 2017, and aggregate depreciable real estate reserves of $85.3 million for the nine months ended September 30, 2017. See Note 4, "Property Dispositions".

We allocate the purchase price of real estate to land and building (inclusive of tenant improvements) and, if determined to be material, intangibles, such as the value of above- and below-market leases and origination costs associated with the in-place leases. We depreciate the amount allocated to building (inclusive of tenant improvements) over their estimated useful lives, which generally range from three to 40 years. We amortize the amount allocated to the above- and below-market leases over the remaining term of the associated lease, which generally range from one to 14 years, and record it as either an increase (in the case of below-market leases) or a decrease (in the case of above-market leases) to rental income. We amortize the amount allocated to the values associated with in-place leases over the expected term of the associated lease, which generally ranges from one to 14 years. If a tenant vacates its space prior to the contractual termination of the lease and no rental payments are being made on the lease, any unamortized balance of the related intangible will be written off. The tenant improvements and origination costs are amortized as an expense over the remaining life of the lease (or charged against earnings if the lease is terminated prior to its contractual expiration date). We assess fair value of the leases based on estimated cash flow projections that utilize appropriate discount and capitalization rates and available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known trends, and market/economic conditions that may affect the property. To the extent acquired leases contain fixed rate renewal options that are below-market and determined to be material, we amortize such below-market lease value into rental income over the renewal period.

We recognized $4.6 million and $15.8 million of rental revenue for the three and nine months ended September 30, 2017, and $0.2 million and $191.4 million of rental revenue for the three and nine months ended September 30, 2016 for the amortization of aggregate below-market leases in excess of above-market leases and a reduction in lease origination costs, resulting from the allocation of the purchase price of the applicable properties. Included in rental revenue is zero and $172.4 million for the three and nine months ended September 30, 2016, for the amortization of the below-market lease at 388-390 Greenwich Street as a result of the tenant exercising their option to purchase the property and entering into an agreement to accelerate the sale. For the three and nine months ended September 30, 2017, we recognized as a reduction to interest expense the amortization of above-market rate mortgages of $0.0 million and $0.8 million, respectively. For the three and nine months ended September 30, 2016, we recognized as a reduction to interest expense the amortization of the above-market rate mortgages assumed of $0.7 million and $2.0 million, respectively.

The following summarizes our identified intangible assets (acquired above-market leases and in-place leases) and intangible liabilities (acquired below-market leases) as of September 30, 2017 and December 31, 2016 (in thousands):

	September 30, 2017			December 31, 2016
Identified intangible assets (included in other assets):
Gross amount	$	474,493		$	651,099
Accumulated amortization	(398,047		)	(410,930		)
Net(1)	$	76,446		$	240,169
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	639,511		$	655,930
Accumulated amortization	(474,365		)	(464,749		)
Net(1)	$	165,146		$	191,181

(1) As of September 30, 2017 and December 31, 2016, $3.9 million and none, respectively and $1.1 million and none, respectively, of net intangible assets and net intangible liabilities, were reclassified to assets held for sale and liabilities related to assets held for sale.

Fair Value Measurements

See Note 16, "Fair Value Measurements."

Investment in Marketable Securities

At acquisition, we designate a security as held-to-maturity, available-for-sale, or trading. As of September 30, 2017, we did not have any securities designated as held-to-maturity or trading. We account for our available-for-sale securities at fair value pursuant to Accounting Standards Codification, or ASC, 820-10, with the net unrealized gains or losses reported as a component of accumulated other comprehensive income or loss. Any unrealized losses that are determined to be other-than-temporary are recognized in earnings up to their credit component.

The cost of bonds and marketable securities sold is determined using the specific identification method.

At September 30, 2017 and December 31, 2016, we held the following marketable securities (in thousands):

	September 30, 2017		December 31, 2016
Equity marketable securities	$	—	$	48,315
Commercial mortgage-backed securities	28,802		36,795
Total marketable securities available-for-sale	$	28,802	$	85,110

The cost basis of the commercial mortgage-backed securities was $27.5 million and $36.0 million at September 30, 2017 and December 31, 2016, respectively. These securities mature at various times through 2049. We held no equity marketable securities as of September 30, 2017. The cost basis of the equity marketable securities was $43.3 million at December 31, 2016.

During the three and nine months ended September 30, 2017, we disposed of marketable securities for aggregate net proceeds of $0.8 million and $55.2 million, respectively. During the three and nine months ended September 30, 2016, we disposed of marketable securities for aggregate net proceeds of $1.7 million and $6.9 million, respectively.

Investments in Unconsolidated Joint Ventures

We assess our investments in unconsolidated joint ventures for recoverability, and if it is determined that a loss in value of the investment is other than temporary, we write down the investment to its fair value. We evaluate our equity investments for impairment based on the joint ventures' projected discounted cash flows. We do not believe that the values of any of our equity investments were impaired at September 30, 2017.

Reserve for Possible Credit Losses

The expense for possible credit losses in connection with debt and preferred equity investments is the charge to earnings to increase the allowance for possible credit losses to the level that we estimate to be adequate, based on Level 3 data, considering delinquencies, loss experience and collateral quality. Other factors considered include geographic trends, product diversification, the size of the portfolio and current economic conditions. Based upon these factors, we establish a provision for possible credit loss on each individual investment. When it is probable that we will be unable to collect all amounts contractually due, the investment is considered impaired.

Where impairment is indicated on an investment that is held to maturity, a valuation allowance is measured based upon the excess of the recorded investment amount over the net fair value of the collateral. Any deficiency between the carrying amount of an asset and the calculated value of the collateral is charged to expense. We continue to assess or adjust our estimates based on circumstances of a loan and the underlying collateral. If additional information reflects increased recovery of our investment, we will adjust our reserves accordingly. There were no loan reserves recorded during the three and nine months ended September 30, 2017 and 2016.

Income Taxes

SL Green is taxed as a REIT under Section 856(c) of the Code. As a REIT, SL Green generally is not subject to Federal income tax. To maintain its qualification as a REIT, SL Green must distribute at least 90% of its REIT taxable income to its stockholders and meet certain other requirements. If SL Green fails to qualify as a REIT in any taxable year, SL Green will be subject to Federal income tax on SL Green's taxable income at regular corporate rates. SL Green may also be subject to certain state, local and franchise taxes. Under certain circumstances, Federal income and excise taxes may be due on SL Green's undistributed taxable income.

The Operating Partnership is a partnership and, as a result, all income and losses of the partnership are allocated to the partners for inclusion in their respective income tax returns. The only provision for income taxes included in the consolidated statements of operations relates to the Operating Partnership’s consolidated taxable REIT subsidiaries. The Operating Partnership may also be subject to certain state, local and franchise taxes.

Pursuant to amendments to the Code that became effective January 1, 2001, we have elected, and may elect in the future, to treat certain of our existing or newly created corporate subsidiaries as taxable REIT subsidiaries, or TRSs. In general, TRSs may perform non-customary services for the tenants of the Company, hold assets that we cannot hold directly and generally may engage in any real estate or non-real estate related business. The TRSs generate income, resulting in Federal and state income tax liability for these entities.

During the three and nine months ended September 30, 2017, we recorded Federal, state and local tax provisions of $0.1 million and $2.8 million, respectively.

We follow a two-step approach for evaluating uncertain tax positions. Recognition (step one) occurs when an enterprise concludes that a tax position, based solely on its technical merits, is more-likely-than-not to be sustained upon examination. Measurement (step two) determines the amount of benefit that is more-likely-than-not to be realized upon settlement. Derecognition of a tax position that was previously recognized would occur when a company subsequently determines that a tax position no longer meets the more-likely-than-not threshold of being sustained. The use of a valuation allowance as a substitute for derecognition of tax positions is prohibited.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

Concentrations of Credit Risk

Financial instruments that potentially subject us to concentrations of credit risk consist primarily of cash investments, debt and preferred equity investments and accounts receivable. We place our cash investments with high quality financial institutions. The collateral securing our debt and preferred equity investments is located in New York City. See Note 5, "Debt and Preferred Equity Investments."

We perform ongoing credit evaluations of our tenants and require most tenants to provide security deposits or letters of credit. Though these security deposits and letters of credit are insufficient to meet the total value of a tenant's lease obligation, they are a measure of good faith and a source of funds to offset the economic costs associated with lost revenue and the costs associated with re-tenanting a space. The properties in our real estate portfolio are primarily located in Manhattan. We also have properties located in Brooklyn, Long Island, Westchester County, Connecticut and New Jersey. The tenants located in our buildings operate in various industries. Other than two tenants, Credit Suisse Securities (USA), Inc. and Viacom International, Inc., who account for 8.8% and 6.7% of our share of annualized cash rent, no other tenant in our portfolio accounted for more than 5.0% of our share of annualized cash rent, including our share of joint venture annualized rent, at September 30, 2017. For the three months ended September 30, 2017, 8.9%, 6.3%, 6.2%, and 5.4% of our share of cash rent, including our share of joint venture annualized rent, was attributable to 1515 Broadway, 11 Madison Avenue, 1185 Avenue of the Americas, and 420 Lexington Avenue, respectively. Our share of annualized cash rent for all other properties was below 5.0%.

Reclassification

Certain prior year balances have been reclassified to conform to our current year presentation.

Accounting Standards Updates

In August 2017, the FASB issued Accounting Standards Update (ASU) No. 2017-12, Derivatives and Hedging (Topic 815), Targeted Improvements to Accounting for Hedging Activities. The amendments in the new standard will permit more flexibility in hedging interest rate risk for both variable rate and fixed rate financial instruments. The standard will also enhance the presentation of hedge results in the financial statements. The guidance is effective for fiscal years beginning after December 15, 2018 and early adoption is permitted. The Company has not yet adopted the guidance, and does not expect a material impact on the Company’s consolidated financial statements when the new standard is implemented.

In May 2017, the FASB issued Accounting Standards Update (ASU) No. 2017-09, Compensation - Stock Compensation (Topic 718), Scope of Modification Accounting. The guidance clarifies the changes to the terms or conditions of a share-based payment award that require an entity to apply modification accounting in Topic 718. The guidance is effective for fiscal years beginning after December 15, 2017 and early adoption is permitted. The Company has not yet adopted the guidance.

In February 2017, the FASB issued Accounting Standards Update (ASU) No. 2017-05 to clarify the scope of Subtopic 610-20 as well as provide guidance on accounting for partial sales of nonfinancial assets. Subtopic 610-20 was issued in May 2014 as part of ASU 2014-09. The Company anticipates adopting this guidance January 1, 2018, and applying the modified retrospective approach. The Company is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements.

In January, 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. The guidance clarifies the definition of a business and provides guidance to assist with determining whether transactions should be accounted for as acquisitions of assets or businesses. The main provision is that an acquiree is not a business if substantially all of the fair value of the gross assets is concentrated in a single identifiable asset or group of assets. The Company adopted the guidance on the issuance date effective January 5, 2017. The Company expects that most of our real estate acquisitions will be considered asset acquisitions under the new guidance and that transaction costs will be capitalized to the investment basis which is then subject to a purchase price allocation based on relative fair value.

In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. The guidance will require entities to show the changes on the total cash, cash equivalents, restricted cash and restricted cash equivalents in the statement of cash flows. As a result, entities will no longer present transfers between these items on the statement of cash flows. The guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements.

In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. The ASU provides final guidance on eight cash flow issues, including debt prepayment or debt extinguishment costs, contingent consideration payments made after a business combination, distributions received from equity method investees, separately identifiable cash flows and application of the predominance principle, and others. The amendments in the ASU are effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. The Company adopted the guidance effective January 1, 2017 and there was no impact on the Company’s consolidated financial statements.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The guidance changes how entities will measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. The guidance replaces the current ‘incurred loss’ model with an ‘expected loss’ approach. The guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted after December 2018. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements.

In March 2016, the FASB issued ASU No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. The guidance simplifies the accounting for share-based payment award transactions including: income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. The guidance is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted. The Company adopted the guidance effective January 1, 2017 and there was no material impact on the Company’s consolidated financial statements.

In March 2016, the FASB issued ASU 2016-07, Investments Equity Method and Joint Ventures (Topic 323). The guidance eliminates the requirement that an entity retroactively adopt the equity method of accounting if an investment qualifies for use of the equity method as a result of an increase in the level of ownership or degree of influence. The amendments require that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor’s previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. The Company adopted the guidance effective January 1, 2017 and there was no impact on the Company’s consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, Leases. The guidance requires lessees to recognize lease assets and lease liabilities for those leases classified as operating leases under the previous standard. Depending on the lease classification, lessees will recognize expense based on the effective interest method for finance leases or on a straight-line basis for operating leases. The accounting applied by a lessor is largely unchanged from that applied under the previous standard. One of the impacts on the Company will be the presentation and disclosure in the financial statements of non-lease components such as charges to tenants for a building’s operating expenses. The non-lease components will be presented separately from the lease components in both the Consolidated Statements of Operations and Consolidated Balance Sheets. Another impact is the measurement and presentation of ground leases under which the Company is lessee. The Company is required to record a liability for the obligation to make payments under the lease and an asset for the right to use the underlying asset during the lease term and will also apply the new expense recognition requirements given the lease classification. The Company is currently quantifying these impacts. The guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. The Company anticipates adopting this guidance January 1, 2019 and will apply the modified retrospective approach.

In January 2016, the FASB issued ASU 2016-01 (Subtopic 825-10), Recognition and Measurement of Financial Assets and Financial Liabilities. The guidance requires entities to measure equity investments that do not result in consolidation and are not accounted for under the equity method at fair value and to record changes in instruments-specific credit risk for financial liabilities measured under the fair value option in other comprehensive income. The guidance is effective for fiscal years beginning after December 15, 2017, and for interim periods therein. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements.

In May 2014, the FASB issued a new comprehensive revenue recognition guidance which requires us to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which we expect to be entitled in exchange for those goods and services (ASU 2014-09). The FASB also issued implementation guidance in March 2016, April 2016 and May 2016 - ASU’s 2016-08, 2016-10 and 2016-12, respectively.

These ASUs are effective for annual and interim periods beginning after December 15, 2017. The Company will adopt this guidance January 1, 2018. Since the Company’s revenue is related to leasing activities, the adoption of this guidance will not have a material impact on the consolidated financial statements. The new guidance is applicable to service contracts with joint ventures for which the Company earns property management fees, leasing commissions and development and construction fees. The adoption of this new guidance does not change the accounting for these fees as the pattern of recognition of revenue does not change with the new guidance. We will continue to recognize revenue over time on these contracts because the customer simultaneously receives and consumes the benefits provided by our performance. Thus, the analysis of our contracts under the new revenue recognition standard is consistent with our current revenue recognition model.

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Property Acquisitions

9 Months Ended

Sep. 30, 2017

Business Combinations [Abstract]

Property Acquisitions

Property Acquisitions

During the nine months ended September 30, 2017, we did not acquire any properties from a third party.

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Properties Held for Sale and Property Dispositions

9 Months Ended

Sep. 30, 2017

Discontinued Operations and Disposal Groups [Abstract]

Properties Held for Sale and Property Dispositions

Properties Held for Sale and Property Dispositions

Properties Held for Sale

During the three months ended September 30, 2017, we entered into an agreement to sell the property at 16 Court Street in Brooklyn, New York, for a gross sales price of $171.0 million.

As of September 30, 2017, 16 Court Street in Brooklyn, New York and 125 Chubb in Lyndhurst, New Jersey were held for sale. We closed on the sale of both properties in October 2017.

Property Dispositions

The following table summarizes the properties sold during the nine months ended September 30, 2017:

Property	Disposition Date	Property Type	Approximate Square Feet	Sales Price(1) (in millions)		Gain (loss)(2) (in millions)
885 Third Avenue (3)	February 2016	Fee Interest	607,000	$	453.0	$	(8.8	)
520 White Plains Road	April 2017	Office	180,000	21.0		(14.6		)
102 Greene Street (4)	April 2017	Retail	9,200	43.5		4.9
680-750 Washington Boulevard	July 2017	Office	325,000	97.0		(44.2		)

(1) Sales price represents the gross sales price for a property or the gross asset valuation for interests in a property.

(2) The gain on sale for 102 Greene Street is net of $0.9 million in employee compensation awards accrued in connection with the realization of the investment gain as a bonus to certain employees that were instrumental in realizing the gain on sale. Additionally, gain on sale amounts do not include adjustments for expenses recorded in subsequent periods.

(3) In February 2016, we closed on the sale of 885 Third Avenue. The sale did not meet the criteria for sale accounting and as a result the property remained on our consolidated financial statements until the criteria was met in April 2017.

(4) In April 2017, we closed on the sale of a 90% interest 102 Greene Street and had subsequently accounted for our interest in the property as an investment in unconsolidated joint ventures. We sold the remaining 10% interest in September 2017. See Note 6, "Investments in Unconsolidated Joint Ventures".

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Debt and Preferred Equity Investments

9 Months Ended

Sep. 30, 2017

Investments, Debt and Equity Securities [Abstract]

Debt and Preferred Equity Investments

Debt and Preferred Equity Investments

Below is the rollforward analysis of the activity relating to our debt and preferred equity investments as of September 30, 2017 and December 31, 2016 (in thousands):

	September 30, 2017			December 31, 2016
Balance at beginning of period (1)	$	1,640,412		$	1,670,020
Debt Investment Originations/Accretion (2)	944,494			1,009,176
Preferred Equity Investment Originations/Accretion (2)	144,013			5,698
Redemptions/Sales/Syndications/Amortization (3)	(708,180		)	(1,044,482		)
Balance at end of period (1)	$	2,020,739		$	1,640,412

(1) Net of unamortized fees, discounts, and premiums.

(2) Accretion includes amortization of fees and discounts and paid-in-kind investment income.

(3) Certain participations in debt investments that were sold or syndicated did not meet the conditions for sale accounting are included in other assets and other liabilities on the consolidated balance sheets.

Debt Investments

As of September 30, 2017 and December 31, 2016, we held the following debt investments with an aggregate weighted average current yield of 9.49%, excluding our investment in Two Herald Square, at September 30, 2017 (in thousands):

Loan Type	September 30, 2017 Future Funding Obligations		September 30, 2017 Senior Financing		September 30, 2017 Carrying Value (1)		December 31, 2016 Carrying Value (1)		Maturity Date (2)
Fixed Rate Investments:
Mortgage/Jr. Mortgage Loan(3)	$	—	$	—	$	250,164	$	—	April 2017
Mortgage Loan(4)	—		—		26,352		26,311		February 2019
Mortgage Loan	—		—		275		380		August 2019
Mezzanine Loan(5a)	—		1,160,000		201,757		—		March 2020
Mezzanine Loan	—		15,000		3,500		3,500		September 2021
Mezzanine Loan	—		147,000		24,909		—		April 2022
Mezzanine Loan	—		87,595		12,697		12,692		November 2023
Mezzanine Loan(5b)	—		115,000		12,930		12,925		June 2024
Mezzanine Loan	—		95,000		30,000		30,000		January 2025
Mezzanine Loan	—		340,000		15,000		15,000		November 2026
Mezzanine Loan	—		1,657,500		55,250		—		June 2027
Mezzanine Loan(6)	—		—		—		66,129
Jr. Mortgage Participation/Mezzanine Loan (7)	—		—		—		193,422
Total fixed rate	$	—	$	3,617,095	$	632,834	$	360,359
Floating Rate Investments:
Mortgage/Mezzanine Loan(8)	622		—		23,372		20,423		October 2017
Mezzanine Loan(5c)	—		85,000		15,340		15,141		December 2017
Mezzanine Loan(5d)	—		65,000		14,832		14,656		December 2017
Mezzanine Loan(5e)	795		—		15,132		15,051		December 2017
Mortgage/Mezzanine Loan(9)	—		125,000		29,966		29,998		January 2018
Mezzanine Loan	—		40,000		19,964		19,913		April 2018
Jr. Mortgage Participation	—		117,808		34,899		34,844		April 2018
Mezzanine Loan	523		20,523		10,916		10,863		August 2018
Mortgage/Mezzanine Loan	—		—		19,914		19,840		August 2018
Mortgage Loan	—		65,000		14,935		14,880		August 2018

Loan Type	September 30, 2017 Future Funding Obligations		September 30, 2017 Senior Financing		September 30, 2017 Carrying Value (1)		December 31, 2016 Carrying Value (1)		Maturity Date (2)
Mortgage/Mezzanine Loan(10)	—		—		16,957		16,960		September 2018
Mezzanine Loan	—		37,500		14,801		14,648		September 2018
Mezzanine Loan	2,325		45,025		34,782		34,502		October 2018
Mezzanine Loan	—		335,000		74,683		74,476		November 2018
Mezzanine Loan	—		33,000		26,907		26,850		December 2018
Mezzanine Loan	1,050		171,939		58,598		56,114		December 2018
Mezzanine Loan	8,267		289,621		71,067		63,137		December 2018
Mezzanine Loan	5,197		229,084		74,314		64,505		December 2018
Mezzanine Loan	—		45,000		12,156		12,104		January 2019
Mortgage/Mezzanine Loan (5f)	30,101		—		158,757		—		January 2019
Mezzanine Loan	6,081		24,086		7,812		5,410		January 2019
Mezzanine Loan	—		38,000		21,927		21,891		March 2019
Mezzanine Loan	279		173,700		36,936		—		April 2019
Mezzanine Loan	—		265,000		24,798		24,707		April 2019
Mortgage/Jr. Mortgage Participation Loan	29,661		194,094		69,705		65,554		August 2019
Mezzanine Loan	2,034		187,500		37,835		37,322		September 2019
Mortgage/Mezzanine Loan	49,933		—		130,350		111,819		September 2019
Mortgage/Mezzanine Loan	30,494		—		38,934		33,682		January 2020
Mezzanine Loan(11)	6,794		537,748		72,597		125,911		January 2020
Mezzanine Loan	7,164		33,587		10,988		—		July 2020
Jr. Mortgage Participation/Mezzanine Loan	—		60,000		15,627		15,606		July 2021
Mezzanine Loan	—		280,000		34,124		—		August 2022
Mezzanine Loan(12)	—		—		—		15,369
Mortgage/ Mezzanine Loan(6)	—		—		—		32,847
Mortgage/Mezzanine Loan(6)	—		—		—		22,959
Mezzanine Loan(13)	—		—		—		14,957
Mortgage/Mezzanine Loan(14)	—		—		—		145,239
Total floating rate	$	181,320	$	3,498,215	$	1,243,925	$	1,232,178
Total	$	181,320	$	7,115,310	$	1,876,759	$	1,592,537

(1) Carrying value is net of discounts, premiums, original issue discounts and deferred origination fees.

(2) Represents contractual maturity, excluding any unexercised extension options.

(3) These loans were purchased at par in April and May 2017 and were in maturity default at the time of acquisition. At the time the loans were purchased, the Company expected to collect all contractually required payments, including interest. In August 2017, the Company determined that it was probable that the loans would not be repaid in full and therefore, the loans were put on non-accrual status. No impairment was recorded as the Company believes that the fair value of the property exceeds the carrying amount of the loans. The loans had an outstanding balance including accrued interest of $259.3 million at the time that they were put on non-accrual status.

(4) In September 2014, we acquired a $26.4 million mortgage loan at a $0.2 million discount and a $5.7 million junior mortgage participation at a $5.7 million discount. The junior mortgage participation was a nonperforming loan at acquisition, is currently on non-accrual status and has no carrying value.

(5) Carrying value is net of the following amounts that were sold or syndicated, which are included in other assets and other liabilities on the consolidated balance sheets as a result of the transfers not meeting the conditions for sale accounting: (a) $1.2 million, (b) $12.0 million, (c) $14.6 million, (d) $14.1 million, (e) $5.1 million, and (f) $21.2 million

(6) This loan was repaid in June 2017.

(7) This loan was repaid in March 2017.

(8) This loan was extended in October 2017.

(9) This loan was extended in January 2017.

(10) This loan was extended in September 2017.

(11) $66.1 million of outstanding principal was syndicated in February 2017.

(12) This loan was repaid in September 2017.

(13) This loan was contributed to a joint venture in May 2017.

(14) This loan was repaid in January 2017.

Preferred Equity Investments

As of September 30, 2017 and December 31, 2016, we held the following preferred equity investments with an aggregate weighted average current yield of 6.98% at September 30, 2017 (in thousands):

Type	September 30, 2017 Future Funding Obligations		September 30, 2017 Senior Financing		September 30, 2017 Carrying Value (1)		December 31, 2016 Carrying Value (1)		Mandatory Redemption (2)
Preferred Equity(3)	$	—	$	272,000	$	143,980	$	—	April 2021
Preferred Equity(4)	—		—		—		9,982
Preferred Equity(5)	—		—		—		37,893
Total	$	—	$	272,000	$	143,980	$	47,875

(1) Carrying value is net of deferred origination fees.

(2) Represents contractual maturity, excluding any unexercised extension options.

(3) In February 2016, we closed on the sale of 885 Third Avenue and retained a preferred equity position in the property. The sale did not meet the criteria for sale accounting under the full accrual method in ASC 360-20, Property, Plant and Equipment - Real Estate Sales. As a result the property remained on our consolidated balance sheet until the criteria was met in April 2017 at which time the property was deconsolidated and the preferred equity investment was recognized.

(4) This investment was redeemed in May 2017.

(5) This investment was redeemed in April 2017.

At September 30, 2017 and December 31, 2016, all debt and preferred equity investments were performing in accordance with the terms of the relevant investments, with the exception of a mortgage and junior mortgage participation purchased in maturity default in May 2017 and April 2017 discussed in subnote 3 of the Debt Investments table above and a junior mortgage participation acquired in September 2014, which was acquired for zero and has a carrying value of zero, as further discussed in subnote 4 of the Debt Investments table above.

We have determined that we have one portfolio segment of financing receivables at September 30, 2017 and 2016 comprising commercial real estate which is primarily recorded in debt and preferred equity investments. Included in other assets is an additional amount of financing receivables totaling $65.6 million and $99.5 million at September 30, 2017 and December 31, 2016, respectively. No financing receivables were 90 days past due at September 30, 2017.

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Investments in Unconsolidated Joint Ventures

9 Months Ended

Sep. 30, 2017

Equity Method Investments and Joint Ventures [Abstract]

Investments in Unconsolidated Joint Ventures

Investments in Unconsolidated Joint Ventures

We have investments in several real estate joint ventures with various partners. As of September 30, 2017, 800 Third Avenue, 21 East 66th Street, 605 West 42^nd Street, 333 East 22nd Street, One Vanderbilt, and certain properties within the Stonehenge Portfolio are VIEs in which we are not the primary beneficiary. Our net equity investment in these VIEs was $598.7 million as of September 30, 2017. As of December 31, 2016, 650 Fifth Avenue, 800 Third Avenue, 21 East 66th Street, 605 West 42^nd Street, 333 East 22nd Street, and certain properties within the Stonehenge Portfolio were VIEs in which we were not the primary beneficiary. Our net equity investment in these VIEs was $220.1 million as of December 31, 2016. Our maximum loss is limited to the amount of our equity investment in these VIEs. All other investments below are voting interest entities. As we do not control the joint ventures listed below, we account for them under the equity method of accounting. The table below provides general information on each of our joint ventures as of September 30, 2017:

Property	Partner	Ownership Interest (1)	Economic Interest (1)	Unaudited Approximate Square Feet	Acquisition Date(2)	Acquisition Price(2) (in thousands)
100 Park Avenue	Prudential Real Estate Investors	49.90%	49.90%	834,000	February 2000	$	95,800
717 Fifth Avenue	Jeff Sutton/Private Investor	10.92%	10.92%	119,500	September 2006	251,900
800 Third Avenue	Private Investors	60.52%	60.52%	526,000	December 2006	285,000
1745 Broadway	Ivanhoe Cambridge, Inc.	56.87%	56.87%	674,000	April 2007	520,000
Jericho Plaza	Onyx Equities/Credit Suisse	11.67%	11.67%	640,000	April 2007	210,000
11 West 34th Street	Private Investor/ Jeff Sutton	30.00%	30.00%	17,150	December 2010	10,800
3 Columbus Circle(3)	The Moinian Group	48.90%	48.90%	741,500	January 2011	500,000
280 Park Avenue	Vornado Realty Trust	50.00%	50.00%	1,219,158	March 2011	400,000
1552-1560 Broadway(4)	Jeff Sutton	50.00%	50.00%	57,718	August 2011	136,550
724 Fifth Avenue	Jeff Sutton	50.00%	50.00%	65,010	January 2012	223,000
10 East 53rd Street	Canadian Pension Plan Investment Board	55.00%	55.00%	354,300	February 2012	252,500
521 Fifth Avenue	Plaza Global Real Estate Partners LP	50.50%	50.50%	460,000	November 2012	315,000
21 East 66th Street(5)	Private Investors	32.28%	32.28%	13,069	December 2012	75,000
650 Fifth Avenue(6)	Jeff Sutton	50.00%	50.00%	69,214	November 2013	—
121 Greene Street	Jeff Sutton	50.00%	50.00%	7,131	September 2014	27,400
175-225 Third Street Brooklyn, New York	KCLW 3rd Street LLC/LIVWRK LLC	95.00%	95.00%	—	October 2014	74,600
55 West 46th Street	Prudential Real Estate Investors	25.00%	25.00%	347,000	November 2014	295,000
Stonehenge Portfolio (7)	Various	Various	Various	1,439,016	February 2015	36,668
131-137 Spring Street	Invesco Real Estate	20.00%	20.00%	68,342	August 2015	277,750
605 West 42nd Street	The Moinian Group	20.00%	20.00%	927,358	April 2016	759,000
11 Madison Avenue	PGIM Real Estate	60.00%	60.00%	2,314,000	August 2016	2,605,000
333 East 22nd Street (8)	Private Investors	33.33%	33.33%	26,926	August 2016	—
400 E 57th Street (9)	BlackRock, Inc and Stonehenge Partners	51.00%	41.00%	290,482	October 2016	170,000
One Vanderbilt (10)	National Pension Service of Korea/Hines Interest LP	71.01%	71.01%	—	January 2017	3,310,000
Mezzanine Loan (11)	Private Investors	33.33%	33.33%	—	May 2017	15,000

(1) Ownership interest and economic interest represent the Company's interests in the joint venture as of September 30, 2017. Changes in ownership or economic interests, if any, within the current year are disclosed in the notes below.

(2) Acquisition date and price represent the date on which the Company initially acquired an interest in the joint venture and the actual or implied gross purchase price for the joint venture on that date. Acquisition date and price are not adjusted for subsequent acquisitions or dispositions of interest.

(3) As a result of the sale of a condominium interest in September 2012, Young & Rubicam, Inc., or Y&R, owns floors three through eight at the property. Because the joint venture has an option to repurchase these floors, the gain associated with this sale was deferred.

(4) The purchase price represents only the purchase of the 1552 Broadway interest which comprised approximately 13,045 square feet. The joint venture also owns a long-term leasehold interest in the retail space and certain other spaces at 1560 Broadway, which is adjacent to 1552 Broadway.

(5) We hold a 32.28% interest in three retail and two residential units at the property and a 16.14% interest in three residential units at the property.

(6) The joint venture owns a long-term leasehold interest in the retail space at 650 Fifth Avenue. In connection with the ground lease obligation, SLG provided a performance guaranty and our joint venture partner executed a contribution agreement to reflect its pro rata obligation. In the event the property is converted into a condominium unit and the landlord elects the purchase option, the joint venture shall be obligated to acquire the unit at the then fair value.

(7) In March 2017, the Company sold a partial interest in the Stonehenge Portfolio as further described under Sale of Joint Venture Interest or Properties below.

(8) The joint venture acquired a leasehold interest in the property in October 2016.

(9) In October 2016, the Company sold a 49% interest in this property to an investment account managed by BlackRock, Inc. The Company's interest in the property was sold within a consolidated joint venture owned 90% by the Company and 10% by Stonehenge. The transaction resulted in the deconsolidation of the venture's remaining 51% interest in the property. The Company's joint venture with Stonehenge remains consolidated resulting in the combined 51% interest being shown within investments in unconsolidated joint ventures on the Company's balance sheet.

(10) In January 2017, the Company admitted two partners, National Pension Service of Korea and Hines Interest LP, into the One Vanderbilt Avenue development project. In April 2017, the criteria for deconsolidation were met, and the development is shown within investments in unconsolidated joint ventures. The partners have committed aggregate equity to the project totaling no less than $525 million and their ownership interest in the joint venture is based on their capital contributions, up to an aggregate maximum of 29.0%. At September 30, 2017 the total of the two partners' ownership interests based on equity contributed was 3.49%.

(11) In May 2017, the Company contributed a mezzanine loan secured by a commercial property in midtown Manhattan to a joint venture and retained a 33.33% interest in the venture. The carrying value is net of $10.0 million that was sold, which is included in other assets and other liabilities on the consolidated balance sheets as a result of the transfers not meeting the conditions for sale accounting. In October 2017, the initial maturity date of November 2017 was extended to November 2018.

Acquisition, Development and Construction Arrangements

Based on the characteristics of the following arrangements, which are similar to those of an investment, combined with the expected residual profit of not greater than 50%, we have accounted for these debt and preferred equity investments under the equity method. As of September 30, 2017 and December 31, 2016, the carrying value for acquisition, development and construction arrangements were as follows (in thousands):

Loan Type	September 30, 2017		December 31, 2016		Maturity Date
Mezzanine Loan and Preferred Equity(1)	$	100,000	$	100,000	March 2018
Mezzanine Loan(2)	44,881		45,622		February 2022
Mezzanine Loan(3)	25,854		24,542		July 2036
	$	170,735	$	170,164

(1) These loans were extended in February 2017.

(2) We have an option to convert our loan to an equity interest subject to certain conditions. We have determined that our option to convert the loan to equity is not a derivative financial instrument pursuant to GAAP.

(3) The Company has the ability to convert this loan into an equity position starting in 2021 and the borrower is able to force this conversion in 2024.

Sale of Joint Venture Interests or Properties

The following table summarizes the investments in unconsolidated joint ventures sold during the nine months ended September 30, 2017:

Property	Ownership Interest	Disposition Date	Type of Sale	Gross Asset Valuation (in thousands)(1)		Gain on Sale (in thousands)(2)
Stonehenge Portfolio (partial)	Various	March 2017	Ownership Interest	$	300,000	$	871
102 Greene Street	10.00%	September 2017	Ownership Interest	$	43,500	$	283

(1) Represents implied gross valuation for the joint venture or sales price of the property.

(2) Represents the Company's share of the gain.

In May 2017, our investment in a joint venture that owned two mezzanine notes secured by interests in the entity that owns 76 11th Avenue was repaid after the joint venture received repayment of the underlying loans.

In May 2017, we recognized a gain of $13.0 million related to the sale in May 2014 of our ownership interest in 747 Madison Avenue. The sale did not meet the criteria for sale accounting at that time and, therefore, remained on our consolidated financial statements. The sale criteria was met in the second quarter of 2017 resulting in recognition of the deferred gain on the sale.

Joint Venture Mortgages and Other Loans Payable

We generally finance our joint ventures with non-recourse debt. In certain cases we have provided guarantees or master leases for tenant space, which terminate upon the satisfaction of specified circumstances or repayment of the underlying loans. The first mortgage notes and other loans payable collateralized by the respective joint venture properties and assignment of leases at September 30, 2017 and December 31, 2016, respectively, are as follows (amounts in thousands):

Property	Economic Interest (1)		Maturity Date	Interest Rate (2)		September 30, 2017		December 31, 2016
Fixed Rate Debt:
521 Fifth Avenue	50.50	%	November 2019	3.73	%	$	170,000	$	170,000
717 Fifth Avenue (3)	10.92	%	July 2022	4.45	%	300,000		300,000

Property	Economic Interest (1)		Maturity Date	Interest Rate (2)		September 30, 2017			December 31, 2016
717 Fifth Avenue (3)	10.92	%	July 2022	5.50	%	355,328			355,328
650 Fifth Avenue	50.00	%	October 2022	4.95	%	225,000			—
21 East 66th Street	32.28	%	April 2023	3.60	%	12,000			12,000
3 Columbus Circle	48.90	%	March 2025	3.61	%	350,000			350,000
11 Madison Avenue	60.00	%	September 2025	3.84	%	1,400,000			1,400,000
800 Third Avenue	60.52	%	February 2026	3.37	%	177,000			177,000
400 East 57th Street	41.00	%	November 2026	3.00	%	100,000			100,000
Stonehenge Portfolio (4)	Various		Various	4.17	%	359,095			362,518
1745 Broadway (5)						—			340,000
Total fixed rate debt						$	3,448,423		$	3,566,846
Floating Rate Debt:
55 West 46th Street (6)	25.00	%	October 2017	3.52	%	$	165,328		$	157,322
175-225 Third Street Brooklyn, New York	95.00	%	December 2017	5.25	%	40,000			40,000
Jericho Plaza (7)	11.67	%	March 2018	5.37	%	79,530			76,993
724 Fifth Avenue	50.00	%	April 2018	3.64	%	275,000			275,000
1552 Broadway (8)	50.00	%	April 2018	5.41	%	185,410			185,410
280 Park Avenue (9)	50.00	%	September 2019	3.09	%	1,200,000			900,000
121 Greene Street	50.00	%	November 2019	2.72	%	15,000			15,000
1745 Broadway (10)	56.87	%	January 2020	3.07	%	345,000			—
10 East 53rd Street	55.00	%	February 2020	3.47	%	170,000			125,000
131-137 Spring Street	20.00	%	August 2020	2.77	%	141,000			141,000
11 West 34th Street	30.00	%	January 2021	2.68	%	23,000			23,000
100 Park Avenue	49.90	%	February 2021	2.97	%	360,000			360,000
One Vanderbilt (11)	71.01	%	September 2021	4.72	%	271,229			—
605 West 42nd Street (12)	20.00	%	August 2027	2.84	%	550,000			539,000
21 East 66th Street	32.28	%	June 2033	3.62	%	1,667			1,726
Stonehenge Portfolio	Various		April 2018	2.47	%	55,340			65,577
650 Fifth Avenue (13)						—			77,500
Total floating rate debt						$	3,877,504		$	2,982,528
Total joint venture mortgages and other loans payable						$	7,325,927		$	6,549,374
Deferred financing costs, net						(127,318		)	(95,408		)
Total joint venture mortgages and other loans payable, net						$	7,198,609		$	6,453,966

(1) Economic interest represent the Company's interests in the joint venture as of September 30, 2017. Changes in ownership or economic interests, if any, within the current year are disclosed in the notes to the investment in unconsolidated joint ventures note above.

(2) Effective weighted average interest rate for the three months ended September 30, 2017, taking into account interest rate hedges in effect during the period.

(3) These loans are comprised of a $300.0 million fixed rate mortgage loan and $355.3 million mezzanine loan. The mezzanine loan is subject to accretion based on the difference between contractual interest rate and contractual pay rate.

(4) Amount is comprised of $34.0 million, $137.7 million, $172.5 million, and $14.9 million in fixed-rate mortgages that mature in November 2017, August 2019, June 2024, and February 2027, respectively.

(5) In January 2017, this loan was refinanced with a floating rate loan as shown above.

(6) This loan has a committed amount of $190.0 million, of which $24.7 million was unfunded as of September 30, 2017. In October 2017, this loan was refinanced with a new $195.0 million mortgage loan with a floating interest rate of 213 basis points over 30-day LIBOR and a maturity date of November 2020.

(7) The property secures a two year $100.0 million loan, of which $79.5 million is currently outstanding.

(8) These loans are comprised of a $145.0 million mortgage loan and a $41.5 million mezzanine loan. As of September 30, 2017, $0.6 million of the mortgage loan and $0.5 million of the mezzanine loan were unfunded. In October 2017, this loan was refinanced with a new $195.0 million mortgage loan with a floating interest rate of 265 basis points over 30-day LIBOR and a maturity date of October 2020.

(9) In August 2017, this loan was refinanced with a new $1.075 billion mortgage loan and a new $125.0 million mezzanine loan, which carry floating interest rates of 148 basis points over 30-day LIBOR and 385 basis points over 30-day LIBOR, respectively. Both the mortgage loan and mezzanine loan initially mature in September 2019.

(10) This loan has a committed amount of $375.0 million, of which $30.0 million was unfunded as of September 30, 2017.

(11) This loan is a $1.5 billion construction facility in connection with the development of One Vanderbilt. This facility bears interest at 350 basis points over 30-day LIBOR, with reduction based on meeting certain conditions, and has an initial five-year term with twoone-year extension options. Advances under the loan are subject to incurred costs, funded equity, loan to value thresholds, and entering into construction contracts.

(12) In August 2017, this loan was refinanced with a new $550.0 million mortgage note, with a floating interest rate of 144 basis points over 30-day LIBOR and a maturity date of August 2027.

(13) In September 2017, this loan was refinanced with a fixed rate loan as shown above.

We act as the operating partner and day-to-day manager for all our joint ventures, except for 800 Third Avenue, Jericho Plaza, 280 Park Avenue, 3 Columbus Circle, 21 East 66th Street, 175-225 Third Street, 605 West 42nd Street, 400 East 57th Street, and the Stonehenge Portfolio. We are entitled to receive fees for providing management, leasing, construction supervision and asset management services to certain of our joint ventures. We earned $2.9 million and $28.1 million from these services for the three and nine months ended September 30, 2017, respectively. We earned $2.0 million and $4.5 million from these services for the three and nine months ended September 30, 2016, respectively. In addition, we have the ability to earn incentive fees based on the ultimate financial performance of certain of the joint venture properties.

The combined balance sheets for the unconsolidated joint ventures, at September 30, 2017 and December 31, 2016 are as follows (in thousands):

	September 30, 2017		December 31, 2016
Assets
Commercial real estate property, net	$	9,944,280	$	9,131,717
Cash and restricted cash	370,596		328,455
Tenant and other receivables, related party receivables, and deferred rents receivable, net of allowance	267,244		232,778
Debt and preferred equity investments, net	201,731		336,164
Other assets	636,365		683,481
Total assets	$	11,420,216	$	10,712,595
Liabilities and members' equity
Mortgages and other loans payable, net	$	7,198,609	$	6,453,966
Deferred revenue/gain	340,310		356,414
Other liabilities	411,261		391,500
Members' equity	3,470,036		3,510,715
Total liabilities and members' equity	$	11,420,216	$	10,712,595
Company's investments in unconsolidated joint ventures	$	2,045,796	$	1,890,186

The combined statements of operations for the unconsolidated joint ventures, for the three and nine months ended September 30, 2017 and 2016, are as follows (in thousands):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Total revenues	$	216,100		$	184,221		$	643,210		$	498,308
Operating expenses	38,055			34,727			115,996			89,147
Ground rent	4,182			3,744			12,612			10,670
Real estate taxes	37,282			30,814			107,391			79,356
Interest expense, net of interest income	61,066			51,789			176,096			147,876
Amortization of deferred financing costs	4,030			7,155			17,994			17,667
Transaction related costs	—			5,359			146			5,359
Depreciation and amortization	61,447			56,890			198,556			132,035
Total expenses	206,062			190,478			628,791			482,110
Loss on early extinguishment of debt	(7,638		)	—			(7,638		)	(1,606		)
Net income (loss) before gain on sale	$	2,400		$	(6,257	)	$	6,781		$	14,592
Company's equity in net income (loss) from unconsolidated joint ventures	$	4,078		$	(3,968	)	$	14,104		$	11,969

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Deferred Costs

9 Months Ended

Sep. 30, 2017

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Deferred Costs

Deferred Costs

Deferred costs at September 30, 2017 and December 31, 2016 consisted of the following (in thousands):

	September 30, 2017			December 31, 2016
Deferred leasing costs	$	464,788		$	468,971
Less: accumulated amortization	(216,807		)	(201,371		)
Deferred costs, net	$	247,981		$	267,600

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Mortgages and Other Loans Payable

9 Months Ended

Sep. 30, 2017

Mortgages and Other Loans Payable

Mortgages and Other Loans Payable

Mortgages and Other Loans Payable

The first mortgages and other loans payable collateralized by the respective properties and assignment of leases or debt investments at September 30, 2017 and December 31, 2016, respectively, were as follows (amounts in thousands):

Property	Maturity Date	Interest Rate (1)		September 30, 2017			December 31, 2016
Fixed Rate Debt:
Unsecured Loan	June 2018	4.81	%	$	16,000		$	16,000
One Madison Avenue	May 2020	5.91	%	494,264			517,806
762 Madison Avenue	February 2022	5.00	%	771			7,694
100 Church Street	July 2022	4.68	%	218,237			221,446
919 Third Avenue (2)	June 2023	5.12	%	500,000			500,000
420 Lexington Avenue	October 2024	3.99	%	300,000			300,000
1515 Broadway	March 2025	3.93	%	876,613			888,531
400 East 58th Street (3)	November 2026	3.00	%	40,000			40,000
Landmark Square	January 2027	4.90	%	100,000			100,000
485 Lexington Avenue	February 2027	4.25	%	450,000			450,000
1080 Amsterdam (4)	February 2027	3.58	%	36,363			—
315 West 33rd Street	February 2027	4.17	%	250,000			—
Series J Preferred Units (5)	April 2051	3.75	%	4,000			4,000
885 Third Avenue (6)				—			267,650
FHLBNY Facility (7)				—			105,000
FHLBNY Facility (7)				—			100,000
Total fixed rate debt				$	3,286,248		$	3,518,127
Floating Rate Debt:
719 Seventh Avenue	February 2018	4.27	%	$	41,171		$	37,388
183, 187 Broadway & 5-7 Dey Street	May 2018	3.92	%	58,000			58,000
2016 Master Repurchase Agreement	July 2018	3.73	%	184,642			184,642
220 East 42nd Street	October 2020	2.82	%	275,000			275,000
One Vanderbilt Avenue (8)				—			64,030
1080 Amsterdam (9)				—			3,525
Total floating rate debt				$	558,813		$	622,585
Total fixed rate and floating rate debt				$	3,845,061		$	4,140,712
Mortgages reclassed to liabilities related to assets held for sale				—			—
Total mortgages and other loans payable				$	3,845,061		$	4,140,712
Deferred financing costs, net of amortization				(40,887		)	(66,882		)
Total mortgages and other loans payable, net				$	3,804,174		$	4,073,830

(1) Effective weighted average interest rate for the quarter ended September 30, 2017, taking into account interest rate hedges in effect during the period.

(2) We own a 51.0% controlling interest in the consolidated joint venture that is the borrower on this loan.

(3) The loan carries a fixed interest rate of 3.00% for the first 5 years and is prepayable without penalty in year 5.

(4) The loan is comprised of a $35.5 million mortgage loan and $0.9 million subordinate loan with a fixed interest rate of 3.50% and 7.00%, respectively, for the first 5 years and is prepayable without penalty in year 5.

(5) In connection with the acquisition of a commercial real estate property, the Operating Partnership issued $4.0 million, 3.75% Series J Preferred Units of limited partnership interest, or the Series J Preferred Units, with a mandatory liquidation preference of $1,000 per unit. The Series J Preferred Units are accounted for as debt because they can be redeemed in cash by the Operating Partnership on the earlier of (i) the date of the sale of the property or (ii) April 30, 2051 or at the option of the unitholders as provided for in the related agreement.

(6) In February 2016, we closed on the sale of 885 Third Avenue. The sale did not meet the criteria for sale accounting at that time. In April 2017, the mortgage was refinanced by the buyer, resulting in the Company deconsolidating the property from its financial statements in the second quarter of 2017.

(7) The facility was repaid in January 2017.

(8) In September 2016, we closed on a $1.5 billion construction facility in connection with the development of One Vanderbilt Avenue. In January 2017, we admitted two partners, National Pension Service of Korea and Hines Interest LP, into the One Vanderbilt Avenue development project. In April 2017, the criteria for deconsolidation were met, and the development is shown within investments in unconsolidated joint ventures. See Note 6, "Investments in Unconsolidated Joint Ventures".

(9) In January 2017, this loan was refinanced with a fixed rate loan as shown above.

At September 30, 2017 and December 31, 2016, the gross book value of the properties and debt and preferred equity investments collateralizing the mortgages and other loans payable, not including assets held for sale, was approximately $6.7 billion and $6.0 billion, respectively.

Federal Home Loan Bank of New York Facility

The Company’s wholly-owned subsidiary, Belmont Insurance Company, or Belmont, a New York licensed captive insurance company, was a member of the Federal Home Loan Bank of New York, or FHLBNY. In January 2017, all funds borrowed from the FHLBNY were repaid and Belmont's membership was terminated in February 2017.

Master Repurchase Agreements

The Company has entered into two Master Repurchase Agreements, or MRAs, known as the 2016 MRA and 2017 MRA, which provide us with the ability to sell certain debt investments with a simultaneous agreement to repurchase the same at a certain date or on demand. We seek to mitigate risks associated with our repurchase agreement by managing the credit quality of our assets, early repayments, interest rate volatility, liquidity, and market value. The margin call provisions under our repurchase facilities permit valuation adjustments based on capital markets activity, and are not limited to collateral-specific credit marks. To monitor credit risk associated with our debt investments, our asset management team regularly reviews our investment portfolio and is in contact with our borrowers in order to monitor the collateral and enforce our rights as necessary. The risk associated with potential margin calls is further mitigated by our ability to recollateralize the facility with additional assets from our portfolio of debt investments, our ability to satisfy margin calls with cash or cash equivalents and our access to additional liquidity through the 2012 credit facility, as defined below.

In June 2017, we entered into the 2017 MRA, with a maximum facility capacity of $300.0 million. The facility bears interest on a floating rate basis at a spread to 30-day LIBOR based on the pledged collateral and advance rate and has an initial one year term, with twoone year extension options. At September 30, 2017, the facility had a carrying value of $(1.1) million, representing deferred financing costs presented within other liabilities.

In July 2016, we entered into a restated 2016 MRA, with a maximum facility capacity of $300.0 million. The facility bears interest ranging from 225 and 400 basis points over 30-day LIBOR depending on the pledged collateral and has an initial two-year term, with a one year extension option. Since December 6, 2015, we have been required to pay monthly in arrears a 25 basis point fee on the excess of $150.0 million over the average daily balance during the period when the average daily balance is less than $150.0 million. At September 30, 2017, the facility had a carrying value of $182.8 million, net of deferred financing costs.

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Corporate Indebtedness

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Corporate Indebtedness

Corporate Indebtedness

2012 Credit Facility

In August 2016, we entered into an amendment to the credit facility that was originally entered into by the Company in November 2012, referred to as the 2012 credit facility. As of September 30, 2017, the 2012 credit facility, as amended, consisted of a $1.6 billion revolving credit facility and a $1.2 billion term loan, with a maturity date of March 29, 2019 and June 30, 2019, respectively. The revolving credit facility has an as-of-right extension to March 29, 2020. We also have an option, subject to customary conditions, to increase the capacity under the revolving credit facility to $3.0 billion at any time prior to the maturity date for the revolving credit facility without the consent of existing lenders, by obtaining additional commitments from our existing lenders and other financial institutions.

As of September 30, 2017, the 2012 credit facility bore interest at a spread over LIBOR ranging from (i) 87.5 basis points to 155 basis points for loans under the revolving credit facility and (ii) 95 basis points to 190 basis points for loans under the term loan facility, in each case based on the credit rating assigned to the senior unsecured long term indebtedness of ROP.

At September 30, 2017, the applicable spread was 125 basis points for the revolving credit facility and 140 basis points for the term loan facility. At September 30, 2017, the effective interest rate, including the effect of interest rate swaps, was 2.49% for the revolving credit facility and 2.49% for the term loan facility. We are required to pay quarterly in arrears a 12.5 to 30 basis point facility fee on the total commitments under the revolving credit facility based on the credit rating assigned to the senior unsecured long term indebtedness of ROP. As of September 30, 2017, the facility fee was 25 basis points.

As of September 30, 2017, we had $80.8 million of outstanding letters of credit, $280.0 million drawn under the revolving credit facility and $1.2 billion outstanding under the term loan facility, with total undrawn capacity of $1.2 billion under the 2012 credit facility. At September 30, 2017 and December 31, 2016, the revolving credit facility had a carrying value of $275.8 million and $(6.3) million, respectively, net of deferred financing costs. The December 31, 2016 carrying value represents deferred financing costs and is presented within other liabilities. At September 30, 2017 and December 31, 2016, the term loan facility had a carrying value of $1.2 billion and $1.2 billion, respectively, net of deferred financing costs.

The Company, the Operating Partnership and ROP are all borrowers jointly and severally obligated under the 2012 credit facility. None of our other subsidiaries are obligors under the 2012 credit facility.

The 2012 credit facility includes certain restrictions and covenants (see Restrictive Covenants below).

Senior Unsecured Notes

The following table sets forth our senior unsecured notes and other related disclosures as of September 30, 2017 and December 31, 2016, respectively, by scheduled maturity date (dollars in thousands):

Issuance	September 30, 2017 Unpaid Principal Balance		September 30, 2017 Accreted Balance			December 31, 2016 Accreted Balance			Coupon Rate (1)		Effective Rate		Initial Term (in Years)	Maturity Date
October 12, 2010 (2)	$	269,000	$	268,628		$	334,077		3.00	%	3.00	%	7	October 2017
August 5, 2011 (3)	250,000		249,934			249,880			5.00	%	5.00	%	7	August 2018
March 16, 2010 (3)	250,000		250,000			250,000			7.75	%	7.75	%	10	March 2020
November 15, 2012 (3)	200,000		200,000			200,000			4.50	%	4.50	%	10	December 2022
December 17, 2015 (3)	100,000		100,000			100,000			4.27	%	4.27	%	10	December 2025
	$	1,069,000	$	1,068,562		$	1,133,957
Deferred financing costs, net			(4,018		)	(5,642		)
	$	1,069,000	$	1,064,544		$	1,128,315

(1) Interest on the senior unsecured notes is payable semi-annually with principal and unpaid interest due on the scheduled maturity dates.

(2) Issued by the Operating Partnership. The notes were senior unsecured obligations of the Operating Partnership and exchangeable at a calculated exchange rate upon the occurrence of specified events and during the period beginning on the twenty-second scheduled trading day prior to the maturity date and ending on the second business day prior to the maturity date, into cash, or a combination of cash and shares of SL Green's common stock, if any, at our option. In accordance with the terms of the indenture, the notes became exchangeable commencing September 14, 2017 and the Operating Partnership elected to settle exchanges in cash. In October 2017, all note holders elected to exchange the notes and the notes were repaid for $350.8 million, excluding accrued interest based on the applicable exchange rate.

(3) Issued by the Company, the Operating Partnership and ROP, as co-obligors. In October 2017, the Company, the Operating Partnership and ROP, as co-obligors issued an additional $100.0 million of the 4.50% senior unsecured bonds due December 2022. The additional notes priced at 105.334% plus accrued interest from June 1, 2017, with a yield to maturity of 3.298%.

In October 2017, the Company issued $500.0 million of senior unsecured notes which will mature in October 2022 and bear interest at a fixed rate of 3.25%.

Restrictive Covenants

The terms of the 2012 credit facility, as amended, and certain of our senior unsecured notes include certain restrictions and covenants which may limit, among other things, our ability to pay dividends, make certain types of investments, incur additional indebtedness, incur liens and enter into negative pledge agreements and dispose of assets, and which require compliance with financial ratios relating to the maximum ratio of total indebtedness to total asset value, a minimum ratio of EBITDA to fixed charges, a maximum ratio of secured indebtedness to total asset value and a maximum ratio of unsecured indebtedness to unencumbered asset value. The dividend restriction referred to above provides that, we will not during any time when a default is continuing, make distributions with respect to common stock or other equity interests, except to enable the Company to continue to qualify as a REIT for Federal income tax purposes. As of September 30, 2017 and 2016, we were in compliance with all such covenants.

Junior Subordinated Deferrable Interest Debentures

In June 2005, the Company and the Operating Partnership issued $100.0 million in unsecured trust preferred securities through a newly formed trust, SL Green Capital Trust I, or the Trust, which is a wholly-owned subsidiary of the Operating Partnership. The securities mature in 2035 and bear interest at a floating rate of 125 basis points over the three-month LIBOR. The effective weighted average interest rate for the quarter ended September 30, 2017 was 2.52%. Interest payments may be deferred for a period of up to eight consecutive quarters if the Operating Partnership exercises its right to defer such payments. The Trust preferred securities are redeemable at the option of the Operating Partnership, in whole or in part, with no prepayment premium. We do not consolidate the Trust even though it is a variable interest entity as we are not the primary beneficiary. Because the Trust is not consolidated, we have recorded the debt on our consolidated balance sheets and the related payments are classified as interest expense.

Principal Maturities

Combined aggregate principal maturities of mortgages and other loans payable, 2012 credit facility, trust preferred securities, senior unsecured notes and our share of joint venture debt as of September 30, 2017, including as-of-right extension options and put options, were as follows (in thousands):

	Scheduled Amortization		Principal		Revolving Credit Facility		Unsecured Term Loan		Trust Preferred Securities		Senior Unsecured Notes			Total		Joint Venture Debt
Remaining 2017	$	12,846	$	—	$	—	$	—	$	—	$	269,000	(1)	$	281,846	$	79,787
2018	54,937		299,813		—		—		—		250,000			604,750		242,799
2019	59,618		—		—		1,183,000		—		—			1,242,618		705,574
2020	41,427		679,531		280,000		—		—		250,000			1,250,958		320,914
2021	30,418		—		—		—		—		—			30,418		376,765
Thereafter	90,532		2,575,939		—		—		100,000		300,000			3,066,471		1,465,371
	$	289,778	$	3,555,283	$	280,000	$	1,183,000	$	100,000	$	1,069,000		$	6,477,061	$	3,191,210

(1) The $269.0 million of 3.00% convertible notes which matured in October 2017 became exchangeable commencing September 14, 2017 and the Operating Partnership elected to settle exchanges in cash. In October 2017, all note holders elected to exchange the notes and the notes were repaid for $350.8 million.

Consolidated interest expense, excluding capitalized interest, was comprised of the following (in thousands):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Interest expense before capitalized interest	$	72,859		$	78,715		$	217,273		$	276,437
Interest capitalized	(6,869		)	(6,084		)	(19,892		)	(18,135		)
Interest income	(356		)	(66		)	(1,269		)	(1,976		)
Interest expense, net	$	65,634		$	72,565		$	196,112		$	256,326

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Related Party Transactions

9 Months Ended

Sep. 30, 2017

Related Party Transactions [Abstract]

Related Party Transactions

Related Party Transactions

Cleaning/ Security/ Messenger and Restoration Services

Alliance Building Services, or Alliance, and its affiliates are partially owned by Gary Green, a son of Stephen L. Green, the chairman of SL Green's board of directors, and provide services to certain properties owned by us. Alliance’s affiliates include First Quality Maintenance, L.P., or First Quality, Classic Security LLC, Bright Star Couriers LLC and Onyx Restoration Works, and provide cleaning, extermination, security, messenger, and restoration services, respectively. In addition, First Quality has the non-exclusive opportunity to provide cleaning and related services to individual tenants at our properties on a basis separately negotiated with any tenant seeking such additional services. The Service Corporation has entered into an arrangement with Alliance whereby it will receive a profit participation above a certain threshold for services provided by Alliance to certain tenants at certain buildings above the base services specified in their lease agreements.

Income earned from profit participation, which is included in other income on the consolidated statements of operations, was $1.0 million and $3.0 million for the three and nine months ended September 30, 2017, respectively, and was $0.8 million and $2.6 million for the three and nine months ended September 30, 2016, respectively.

We also recorded expenses for these services, inclusive of capitalized expenses, of $5.7 million and $16.0 million for the three and nine months ended September 30, 2017, respectively, for these services (excluding services provided directly to tenants), and $5.3 million and $16.1 million for the three and nine months ended September 30, 2016, respectively.

Management Fees

S.L. Green Management Corp., a consolidated entity, receives property management fees from an entity in which Stephen L. Green owns an interest. We received management fees from this entity of $0.1 million and $0.4 million for the three and nine months ended September 30, 2017, respectively, and $0.1 million and $0.3 million for the three and nine months ended September 30, 2016, respectively.

One Vanderbilt Investment

In December 2016, we entered into agreements with entities owned and controlled by Marc Holliday and Andrew Mathias, pursuant to which they agreed to make an investment in our One Vanderbilt project at the appraised fair market value for the interests acquired. This investment entitles these entities to receive approximately 1.50% - 1.80% and 1.00% - 1.20%, respectively, of any profits realized by the Company from its One Vanderbilt project in excess of the Company’s capital contributions. The entities have no right to any return of capital. Accordingly, subject to previously disclosed repurchase rights, these interests will have no value and will not entitle these entities to any amounts (other than limited distributions to cover tax liabilities incurred) unless and until the Company has received distributions from the One Vanderbilt project in excess of the Company’s aggregate investment in the project. In the event that the Company does not realize a profit on its investment in the project (or would not realize a profit based on the value at the time the interests are repurchased), the entities owned and controlled by Messrs. Holliday and Mathias will lose the entire amount of their investment.

Fifty percent of these interests were purchased on December 31, 2016 and the remaining fifty percent will be purchased on December 31, 2017. The entities owned and controlled by Messrs. Holliday and Mathias will pay $1.4 million and $1.0 million, respectively, which equals the fair market value of the interests acquired as of the date the investment agreements were entered into as determined by an independent third party appraisal that we obtained.

Other

We are entitled to receive fees for providing management, leasing, construction supervision and asset management services to certain of our joint ventures as further described in Investments in Unconsolidated Joint Ventures. Amounts due from joint ventures and related parties at September 30, 2017 and December 31, 2016 consisted of the following (in thousands):

	September 30, 2017		December 31, 2016
Due from joint ventures	$	16,736	$	1,240
Other	7,332		14,616
Related party receivables	$	24,068	$	15,856

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Noncontrolling Interests on the Company's Consolidated Financial Statements

9 Months Ended

Sep. 30, 2017

Noncontrolling Interest [Abstract]

Noncontrolling Interests on the Company's Consolidated Financial Statements

Noncontrolling Interests on the Company's Consolidated Financial Statements

Noncontrolling interests represent the common and preferred units of limited partnership interest in the Operating Partnership not held by the Company as well as third party equity interests in our other consolidated subsidiaries. Noncontrolling interests in the Operating Partnership are shown in the mezzanine equity while the noncontrolling interests in our other consolidated subsidiaries are shown in the equity section of the Company’s consolidated financial statements.

Common Units of Limited Partnership Interest in the Operating Partnership

As of September 30, 2017 and December 31, 2016, the noncontrolling interest unit holders owned 4.45%, or 4,541,765 units, and 4.16%, or 4,363,716 units, of the Operating Partnership, respectively. As of September 30, 2017, 4,541,765 shares of SL Green's common stock were reserved for issuance upon the redemption of units of limited partnership interest of the Operating Partnership.

Noncontrolling interests in the Operating Partnership is recorded at the greater of its cost basis or fair market value based on the closing stock price of SL Green's common stock at the end of the reporting period.

Below is the rollforward analysis of the activity relating to the noncontrolling interests in the Operating Partnership as of September 30, 2017 and December 31, 2016 (in thousands):

	September 30, 2017			December 31, 2016
Balance at beginning of period	$	473,882		$	424,206
Distributions	(10,639		)	(12,671		)
Issuance of common units	23,273			78,495
Redemption of common units	(15,353		)	(31,805		)
Net income	2,707			10,136
Accumulated other comprehensive income allocation	(303		)	1,299
Fair value adjustment	(2,669		)	4,222
Balance at end of period	$	470,898		$	473,882

Preferred Units of Limited Partnership Interest in the Operating Partnership

The Operating Partnership has 1,902,0004.50% Series G Preferred Units of limited partnership interest, or the Series G Preferred Units outstanding, with a liquidation preference of $25.00 per unit, which were issued in January 2012 in conjunction with an acquisition. The Series G Preferred unitholders receive annual dividends of $1.125 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series G Preferred Units are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) $88.50. The common units of limited partnership interest in the Operating Partnership may be redeemed in exchange for SL Green's common stock on a 1-to-1 basis. The Series G Preferred Units also provide the holder with the right to require the Operating Partnership to repurchase the Series G Preferred Units for cash before January 31, 2022.

The Operating Partnership has 60 Series F Preferred Units outstanding with a mandatory liquidation preference of $1,000.00 per unit.

The Operating Partnership has authorized up to 700,0003.50% Series K Preferred Units of limited partnership interest, or the Series K Preferred Units, with a liquidation preference of $25.00 per unit. In August 2014, the Company issued 563,954 Series K Preferred Units in conjunction with an acquisition. The Series K Preferred unitholders receive annual dividends of $0.875 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series K Preferred Units can be redeemed at any time, at the option of the unitholder, either for cash or are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) $134.67.

The Operating Partnership has authorized up to 500,0004.00% Series L Preferred Units of limited partnership interest, or the Series L Preferred Units, with a liquidation preference of $25.00 per unit. In August 2014, the Company issued 378,634 Series L Preferred Units in conjunction with an acquisition. The Series L Preferred unitholders receive annual dividends of $1.00 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series L Preferred Units can be redeemed at any time at par for cash at the option of the unitholder.

The Operating Partnership has authorized up to 1,600,0003.75% Series M Preferred Units of limited partnership interest, or the Series M Preferred Units, with a liquidation preference of $25.00 per unit. In February 2015, the Company issued 1,600,000 Series M Preferred Units in conjunction with the acquisition of ownership interests in and relating to certain residential and retail real estate properties. The Series M Preferred unitholders receive annual dividends of $0.9375 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series M Preferred Units can be redeemed at any time at par for cash at the option of the unitholder.

The Operating Partnership has authorized up to 552,3033.00% Series N Preferred Units of limited partnership interest, or the Series N Preferred Units, with a liquidation preference of $25.00 per unit. In June 2015, the Company issued 552,303 Series N Preferred Units in conjunction with an acquisition. The Series N Preferred unitholders receive annual dividends of $0.75 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series N Preferred Units can be redeemed at any time at par for cash at the option of the unitholder.

The Operating Partnership has authorized an aggregate of one6.25% Series O Preferred Unit of limited partnership interest, or the Series O Preferred Unit. In June 2015, the Company issued the Series O Preferred Unit in connection with an acquisition.

The Operating Partnership has authorized up to 200,0004.00% Series P Preferred Units of limited partnership interest, or the Series P Preferred Units, with a liquidation preference of $25.00 per unit. In July 2015, the Company issued 200,000 Series P Preferred Units in conjunction with an acquisition. The Series P Preferred unitholders receive annual dividends of $1.00 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series P Preferred Units can be redeemed at any time at par for cash at the option of the unitholder.

The Operating Partnership has authorized up to 268,0003.50% Series Q Preferred Units of limited partnership interest, or the Series Q Preferred Units, with a liquidation preference of $25.00 per unit. In July 2015, the Company issued 268,000 Series Q Preferred Units in conjunction with an acquisition. The Series Q Preferred unitholders receive annual dividends of $0.875 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series Q Preferred Units can be redeemed at any time, at the option of the unitholder, either for cash or are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) $148.95.

The Operating Partnership has authorized up to 400,0003.50% Series R Preferred Units of limited partnership interest, or the Series R Preferred Units, with a liquidation preference of $25.00 per unit. In August 2015, the Company issued 400,000 Series R Preferred Units in conjunction with an acquisition. The Series R Preferred unitholders receive annual dividends of $0.875 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series R Preferred Units can be redeemed at any time, at the option of the unitholder, either for cash or are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) $154.89.

The Operating Partnership has authorized up to 1,077,2804.00% Series S Preferred Units of limited partnership interest, or the Series S Preferred Units, with a liquidation preference of $25.00 per unit. In August 2015, the Company issued 1,077,280 Series S Preferred Units in conjunction with an acquisition. The Series S Preferred unitholders receive annual dividends of $1.00 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series S Preferred Units can be redeemed at any time at par for cash at the option of the unitholder.

The Operating Partnership has authorized up to 230,0002.75% Series T Preferred Units of limited partnership interest, or the Series T Preferred Units, with a liquidation preference of $25.00 per unit. In March 2016, the Company issued 230,000 Series T Preferred Units in conjunction with an acquisition. The Series T Preferred unitholders receive annual dividends of $0.6875 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series T Preferred Units can be redeemed at any time at par, at the option of the unitholder, either for cash or are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) $119.02.

The Operating Partnership has authorized up to 680,0004.50% Series U Preferred Units of limited partnership interest, or the Series U Preferred Units, with a liquidation preference of $25.00 per unit. In March 2016, the Company issued 680,000 Series U Preferred Units in conjunction with an acquisition. The Series U Preferred unitholders initially receive annual dividends of $1.125 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The annual dividend is subject to reduction upon the occurence of certain circumstances set forth in the terms of the Series U Preferred Units. The minimum annual dividend is $0.75 per unit. The Series U Preferred Units can be redeemed at any time at par for cash at the option of the unitholder.

Through a consolidated subsidiary, we have authorized up to 109,1613.50% Series A Preferred Units of limited partnership interest, or the Subsidiary Series A Preferred Units, with a liquidation preference of $1,000.00 per unit. In August 2015, the Company issued 109,161 Subsidiary Series A Preferred Units in conjunction with an acquisition. The Subsidiary Series A Preferred unitholders receive annual dividends of $35.00 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Subsidiary Series A Preferred Units can be redeemed at any time, at the option of the unitholder, either for cash or are convertible on a one-for-one basis, into the Series B Preferred Units of limited partnership interest, or the Subsidiary Series B Preferred Units. The Subsidiary Series B Preferred Units can be converted at any time, at the option of the unitholder, into a number of common stock equal to 6.71348 shares of common stock for each Subsidiary Series B Preferred Unit. As of September 30, 2017, no Subsidiary Series B Preferred Units have been issued.

Below is the rollforward analysis of the activity relating to the preferred units in the Operating Partnership as of September 30, 2017 and December 31, 2016 (in thousands):

	September 30, 2017			December 31, 2016
Balance at beginning of period	$	302,010		$	282,516
Issuance of preferred units	—			22,793
Redemption of preferred units	(125		)	(3,299		)
Balance at end of period	$	301,885		$	302,010

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Stockholders' Equity of the Company

9 Months Ended

Sep. 30, 2017

Stockholders' Equity Note [Abstract]

Stockholders' Equity of the Company

Stockholders’ Equity of the Company

Common Stock

Our authorized capital stock consists of 260,000,000 shares, $0.01 par value per share, consisting of 160,000,000 shares of common stock, $0.01 par value per share, 75,000,000 shares of excess stock, at $0.01 par value per share, and 25,000,000 shares of preferred stock, par value $0.01 per share. As of September 30, 2017, 97,445,509 shares of common stock and no shares of excess stock were issued and outstanding.

In August 2016, our board of directors approved a stock repurchase plan under which we can buy up to $1.0 billion of shares of our common stock. At September 30, 2017, repurchases made under the stock repurchase plans were as follows:

Period	Total number of shares purchased	Average price paid per share	Total number of shares purchased as part of the repurchase plan or programs	Maximum approximate dollar value of shares that may yet be purchased under the plan (in millions)
First quarter 2017	982	$103.89	982	$999.9
Second quarter 2017	2,447,153	$103.41	2,448,135	$746.8
Third quarter 2017	951,866	$101.67	3,400,001	$650.0

Perpetual Preferred Stock

We have 9,200,000 shares of our 6.50% Series I Cumulative Redeemable Preferred Stock, or the Series I Preferred Stock, outstanding with a mandatory liquidation preference of $25.00 per share. The Series I Preferred stockholders receive annual dividends of $1.625 per share paid on a quarterly basis and dividends are cumulative, subject to certain provisions. We are entitled to redeem the Series I Preferred Stock at par for cash at our option. In August 2012, we received $221.9 million in net proceeds from the issuance of the Series I Preferred Stock, which were recorded net of underwriters' discount and issuance costs, and contributed the net proceeds to the Operating Partnership in exchange for 9,200,000 units of 6.50% Series I Cumulative Redeemable Preferred Units of limited partnership interest, or the Series I Preferred Units.

Dividend Reinvestment and Stock Purchase Plan

In February 2015, the Company filed a registration statement with the SEC for our dividend reinvestment and stock purchase plan, or DRSPP, which automatically became effective upon filing. The Company registered 3,500,000 shares of SL Green's common stock under the DRSPP. The DRSPP commenced on September 24, 2001.

Earnings per Share

SL Green's earnings per share for the three and nine months ended September 30, 2017 and 2016 are computed as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
Numerator	2017		2016		2017		2016
Basic Earnings:
Income attributable to SL Green common stockholders	$	38,869	$	34,252	$	58,442	$	190,930
Effect of Dilutive Securities:
Redemption of units to common shares	1,812		1,663		2,707		8,171
Diluted Earnings:
Income attributable to SL Green common stockholders	$	40,681	$	35,915	$	61,149	$	199,101

	Three Months Ended September 30,		Nine Months Ended September 30,
Denominator	2017	2016	2017	2016
Basic Shares:
Weighted average common stock outstanding	97,783	100,233	99,431	100,140
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares	4,543	4,497	4,570	4,272
Stock-based compensation plans	244	413	279	349
Diluted weighted average common stock outstanding	102,570	105,143	104,280	104,761

SL Green has excluded 1,175,708 and 1,076,695 common stock equivalents from the diluted shares outstanding for the three and nine months ended September 30, 2017, respectively, as they were anti-dilutive. SL Green has excluded 673,298 and 753,344 common stock equivalents from the diluted shares outstanding for the three and nine months ended September 30, 2016, respectively, as they were anti-dilutive.

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Partners' Capital of the Operating Partnership

9 Months Ended

Sep. 30, 2017

Stockholders' Equity

Partners' Capital of the Operating Partnership

Stockholders’ Equity of the Company

Common Stock

Our authorized capital stock consists of 260,000,000 shares, $0.01 par value per share, consisting of 160,000,000 shares of common stock, $0.01 par value per share, 75,000,000 shares of excess stock, at $0.01 par value per share, and 25,000,000 shares of preferred stock, par value $0.01 per share. As of September 30, 2017, 97,445,509 shares of common stock and no shares of excess stock were issued and outstanding.

In August 2016, our board of directors approved a stock repurchase plan under which we can buy up to $1.0 billion of shares of our common stock. At September 30, 2017, repurchases made under the stock repurchase plans were as follows:

Period	Total number of shares purchased	Average price paid per share	Total number of shares purchased as part of the repurchase plan or programs	Maximum approximate dollar value of shares that may yet be purchased under the plan (in millions)
First quarter 2017	982	$103.89	982	$999.9
Second quarter 2017	2,447,153	$103.41	2,448,135	$746.8
Third quarter 2017	951,866	$101.67	3,400,001	$650.0

Perpetual Preferred Stock

We have 9,200,000 shares of our 6.50% Series I Cumulative Redeemable Preferred Stock, or the Series I Preferred Stock, outstanding with a mandatory liquidation preference of $25.00 per share. The Series I Preferred stockholders receive annual dividends of $1.625 per share paid on a quarterly basis and dividends are cumulative, subject to certain provisions. We are entitled to redeem the Series I Preferred Stock at par for cash at our option. In August 2012, we received $221.9 million in net proceeds from the issuance of the Series I Preferred Stock, which were recorded net of underwriters' discount and issuance costs, and contributed the net proceeds to the Operating Partnership in exchange for 9,200,000 units of 6.50% Series I Cumulative Redeemable Preferred Units of limited partnership interest, or the Series I Preferred Units.

Dividend Reinvestment and Stock Purchase Plan

In February 2015, the Company filed a registration statement with the SEC for our dividend reinvestment and stock purchase plan, or DRSPP, which automatically became effective upon filing. The Company registered 3,500,000 shares of SL Green's common stock under the DRSPP. The DRSPP commenced on September 24, 2001.

Earnings per Share

SL Green's earnings per share for the three and nine months ended September 30, 2017 and 2016 are computed as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
Numerator	2017		2016		2017		2016
Basic Earnings:
Income attributable to SL Green common stockholders	$	38,869	$	34,252	$	58,442	$	190,930
Effect of Dilutive Securities:
Redemption of units to common shares	1,812		1,663		2,707		8,171
Diluted Earnings:
Income attributable to SL Green common stockholders	$	40,681	$	35,915	$	61,149	$	199,101

	Three Months Ended September 30,		Nine Months Ended September 30,
Denominator	2017	2016	2017	2016
Basic Shares:
Weighted average common stock outstanding	97,783	100,233	99,431	100,140
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares	4,543	4,497	4,570	4,272
Stock-based compensation plans	244	413	279	349
Diluted weighted average common stock outstanding	102,570	105,143	104,280	104,761

SL Green has excluded 1,175,708 and 1,076,695 common stock equivalents from the diluted shares outstanding for the three and nine months ended September 30, 2017, respectively, as they were anti-dilutive. SL Green has excluded 673,298 and 753,344 common stock equivalents from the diluted shares outstanding for the three and nine months ended September 30, 2016, respectively, as they were anti-dilutive.

SL Green Operating Partnership

Stockholders' Equity

Partners' Capital of the Operating Partnership

Partners' Capital of the Operating Partnership

The Company is the sole general partner of the Operating Partnership and at September 30, 2017 owned 97,445,509 general and limited partnership interests in the Operating Partnership and 9,200,000 Series I Preferred Units. Partnership interests in the Operating Partnership are denominated as “common units of limited partnership interest” (also referred to as “OP Units”) or “preferred units of limited partnership interest” (also referred to as “Preferred Units”). All references to OP Units and Preferred Units outstanding exclude such units held by the Company. A holder of an OP Unit may present such OP Unit to the Operating Partnership for redemption at any time (subject to restrictions agreed upon at the issuance of OP Units to particular holders that may restrict such right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, the Operating Partnership must redeem such OP Unit in exchange for the cash equal to the then value of a share of common stock of the Company, except that the Company may, at its election, in lieu of cash redemption, acquire such OP Unit for one share of common stock. Because the number of shares of common stock outstanding at all times equals the number of OP Units that the Company owns, one share of common stock is generally the economic equivalent of one OP Unit, and the quarterly distribution that may be paid to the holder of an OP Unit equals the quarterly dividend that may be paid to the holder of a share of common stock. Each series of Preferred Units makes a distribution that is set in accordance with an amendment to the partnership agreement of the Operating Partnership. Preferred Units may also be convertible into OP Units at the election of the holder thereof or the Company, subject to the terms of such Preferred Units.

Net income (loss) allocated to the preferred unitholders and common unitholders reflects their pro rata share of net income (loss) and distributions.

Limited Partner Units

As of September 30, 2017, limited partners other than SL Green owned 4.45%, or 4,541,765 common units, of the Operating Partnership.

Preferred Units

Preferred units not owned by SL Green are further described in Note 11, “Noncontrolling Interests on the Company’s Consolidated Financial Statements - Preferred Units of Limited Partnership Interest in the Operating Partnership.”

Earnings per Unit

The Operating Partnership's earnings per unit for the three and nine months ended September 30, 2017 and 2016, respectively are computed as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
Numerator	2017		2016		2017		2016
Basic and Diluted Earnings:
Net income attributable to SLGOP common unitholders	$	40,681	$	35,915	$	61,149	$	199,101

	Three Months Ended September 30,		Nine Months Ended September 30,
Denominator	2017	2016	2017	2016
Basic units:
Weighted average common units outstanding	102,326	104,730	104,001	104,412
Effect of Dilutive Securities:
Stock-based compensation plans	244	413	279	349
Diluted weighted average common units outstanding	102,570	105,143	104,280	104,761

The Operating Partnership has excluded 1,175,708 and 1,076,695 common unit equivalents from the diluted units outstanding for the three and nine months ended September 30, 2017, respectively, as they were anti-dilutive. The Operating Partnership has excluded 673,298 and 753,344 common unit equivalents from the diluted units outstanding for the three and nine months ended September 30, 2016, respectively, as they were anti-dilutive.

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Share-based Compensation

9 Months Ended

Sep. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-based Compensation

Share-based Compensation

We have stock-based employee and director compensation plans. Our employees are compensated through the Operating Partnership. Under each plan, whenever the Company issues common or preferred stock, the Operating Partnership issues an equivalent number of units of limited partnership interest of a corresponding class to the Company.

Fourth Amended and Restated 2005 Stock Option and Incentive Plan

The Fourth Amended and Restated 2005 Stock Option and Incentive Plan, or the 2005 Plan, was approved by the Company's board of directors in April 2016 and its stockholders in June 2016 at the Company's annual meeting of stockholders. The 2005 Plan authorizes the issuance of stock options, stock appreciation rights, unrestricted and restricted stock, phantom shares, dividend equivalent rights, cash-based awards and other equity-based awards. Subject to adjustments upon certain corporate transactions or events, awards with respect to up to a maximum of 27,030,000 fungible units may be granted under the 2005 Plan. Currently, different types of awards count against the limit on the number of fungible units differently, with (1) full-value awards (i.e., those that deliver the full value of the award upon vesting, such as restricted stock) granted after the effective date of the Fourth Amendment 2005 Plan counting as 3.74 Fungible Units per share subject to such awards, (2) stock options, stock appreciation rights and other awards that do not deliver full value and expire five years from the date of grant counting as 0.73 fungible units per share subject to such awards, and (3) all other awards (e.g., ten-year stock options) counting as 1.0 fungible units per share subject to such awards. Awards granted under the 2005 Plan prior to the approval of the fourth amendment and restatement in June 2016 continue to count against the fungible unit limit based on the ratios that were in effect at the time such awards were granted, which may be different than the current ratios. As a result, depending on the types of awards issued, the 2005 Plan may result in the issuance of more or less than 27,030,000 shares. If a stock option or other award granted under the 2005 Plan expires or terminates, the common stock subject to any portion of the award that expires or terminates without having been exercised or paid, as the case may be, will again become available for the issuance of additional awards. Shares of SL Green's common stock distributed under the 2005 Plan may be treasury shares or authorized but unissued shares. Currently, unless the 2005 Plan has been previously terminated by the Company's board of directors, new awards may be granted under the 2005 Plan until June 2, 2026, which is the tenth anniversary of the date that the 2005 Plan was most recently approved by the Company's stockholders. As of September 30, 2017, 8.7 million fungible units were available for issuance under the 2005 Plan after reserving for shares underlying outstanding restricted stock units, phantom stock units granted pursuant to our Non-Employee Directors' Deferral Program and LTIP Units, including, among others, outstanding LTIP Units issued under our 2014 Outperformance Plan.

Options are granted under the plan with an exercise price at the fair market value of the Company's common stock on the date of grant and, subject to employment, generally expire five or ten years from the date of grant, are not transferable other than on death, and generally vest in one to five years commencing one year from the date of grant. We have also granted Class O LTIP Units, which are a class of LTIP Units in the Operating Partnership structured to provide economics similar to those of stock options. Class O LTIP Units, once vested, may be converted, at the election of the holder, into a number of common units of the Operating Partnership per Class O LTIP Unit determined by the increase in value of a share of the Company’s common stock at the time of conversion over a participation threshold, which equals the fair market value of a share of the Company’s common stock at the time of grant. Class O LTIP Units are entitled to distributions, subject to vesting, equal per unit to 10% of the per unit distributions paid with respect to the common units of the Operating Partnership.

The fair value of each stock option or LTIP Unit granted is estimated on the date of grant using the Black-Scholes option pricing model based on historical information with the following weighted average assumptions for grants during the nine months ended September 30, 2017 and the year ended December 31, 2016.

	September 30, 2017		December 31, 2016
Dividend yield	2.50	%	2.37	%
Expected life	4.4 years		3.7 years
Risk-free interest rate	1.73	%	1.57	%
Expected stock price volatility	28.21	%	26.76	%

A summary of the status of the Company's stock options as of September 30, 2017 and December 31, 2016, and changes during the nine months ended September 30, 2017 and year ended December 31, 2016 are as follows:

	September 30, 2017					December 31, 2016
	Options Outstanding			Weighted Average Exercise Price		Options Outstanding			Weighted Average Exercise Price
Balance at beginning of period	$	1,737,213		$	98.44	$	1,595,007		$	95.52
Granted	171,000			105.70		445,100			105.86
Exercised	(146,277		)	84.02		(192,875		)	76.90
Lapsed or cancelled	(65,300		)	122.30		(110,019		)	123.86
Balance at end of period	$	1,696,636		$	99.50	$	1,737,213		$	98.44
Options exercisable at end of period	939,485			$	91.71	748,617			$	87.72
Weighted average fair value of options granted during the period	$	3,775,639				$	8,363,036

All options were granted with strike prices ranging from $20.67 to $128.82. The remaining weighted average contractual life of the options outstanding was 3.6 years and the remaining average contractual life of the options exercisable was 2.8 years.

During the three and nine months ended September 30, 2017, we recognized compensation expense for these options of $2.0 million and $5.9 million, respectively. During the three and nine months ended September 30, 2016, we recognized compensation expense for these options of $2.5 million and $6.4 million, respectively.

As of September 30, 2017, there was $10.6 million of total unrecognized compensation cost related to unvested stock options, which is expected to be recognized over a weighted average period of 1.7 years.

Stock-based Compensation

Effective January 1, 1999, the Company implemented a deferred compensation plan, or the Deferred Plan, where shares issued under the Deferred Plan were granted to certain employees, including certain of our executives and vesting will occur annually upon the completion of a service period or our meeting established financial performance criteria. Annual vesting occurs at rates ranging from 15% to 35% once performance criteria are reached.

A summary of the Company's restricted stock as of September 30, 2017 and December 31, 2016 and charges during the nine months ended September 30, 2017 and the year ended December 31, 2016, are as follows:

	September 30, 2017		December 31, 2016
Balance at beginning of period	3,202,031		3,137,881
Granted	300		98,800
Cancelled	—		(34,650		)
Balance at end of period	3,202,331		3,202,031
Vested during the period	86,736		83,822
Compensation expense recorded	$	7,277,054	$	7,153,966
Weighted average fair value of restricted stock granted during the period	$	30,813	$	10,650,077

The fair value of restricted stock that vested during the nine months ended September 30, 2017 and the year ended December 31, 2016 was $8.4 million and $7.6 million, respectively. As of September 30, 2017 there was $13.7 million of total unrecognized compensation cost related to restricted stock, which is expected to be recognized over a weighted average period of 1.7 years.

For the three and nine months ended September 30, 2017, $1.4 million and $5.0 million, respectively, was capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options. For the three and nine months ended September 30, 2016, $1.5 million and $4.4 million, respectively, was capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options.

We have granted LTIP Units, which include bonus, time-based and performance based awards, with a fair value of $20.5 million and $34.9 million as of September 30, 2017 and December 31, 2016, respectively. The grant date fair value of the LTIP Unit awards was calculated in accordance with ASC 718. A third party consultant determined the fair value of the LTIP Units to have a discount from SL Green's common stock price. The discount was calculated by considering the inherent uncertainty that the LTIP Units will reach parity with other common partnership units and the illiquidity due to transfer restrictions. As of September 30, 2017, there was $7.1 million of total unrecognized compensation expense related to the time-based and performance based awards, which is expected to be recognized over a weighted average period of 1.2 years.

During the three and nine months ended September 30, 2017, we recorded compensation expense related to bonus, time-based and performance based awards of $2.5 million and $15.1 million, respectively. During the three and nine months ended September 30, 2016, we recorded compensation expense related to bonus, time-based and performance based awards of $2.3 million and $15.1 million, respectively.

2014 Outperformance Plan

In August 2014, the compensation committee of the Company's board of directors approved the general terms of the SL Green Realty Corp. 2014 Outperformance Plan, or the 2014 Outperformance Plan. Participants in the 2014 Outperformance Plan may earn, in the aggregate, up to 610,000 LTIP Units in our Operating Partnership based on our total return to stockholders for the three-year period beginning September 1, 2014. Under the 2014 Outperformance Plan, two-thirds of the LTIP Units may be earned based on the Company’s absolute total return to stockholders and one-third of the LTIP Units may be earned based on relative total return to stockholders compared to the constituents of the MSCI REIT Index. Awards earned based on absolute total return to stockholders will be determined independently of awards earned based on relative total return to stockholders. In the event the Company’s performance reaches either threshold before the end of the three-year performance period, a pro-rata portion of the maximum award may be earned. For each component, if the Company’s performance reaches the maximum threshold beginning with the 19th month of the performance period, participants will earn one-third of the maximum award that may be earned for that component. If the Company’s performance reaches the maximum threshold during the third year of the performance period for a component, participants will earn two-thirds (or an additional one-third) of the maximum award that may be earned for that component. LTIP Units earned under the 2014 Outperformance Plan will be subject to continued vesting requirements, with 50% of any awards earned vesting on August 31, 2017 and the remaining 50% vesting on August 31, 2018, subject to continued employment with us through such dates. Participants will not be entitled to distributions with respect to LTIP Units granted under the 2014 Outperformance Plan unless and until they are earned. If LTIP Units are earned, each participant will also be entitled to the distributions that would have been paid had the number of earned LTIP Units been issued at the beginning of the performance period, with such distributions being paid in the form of cash or additional LTIP Units. Thereafter, distributions will be paid currently with respect to all earned LTIP Units, whether vested or unvested.

The cost of the 2014 Outperformance Plan ($29.2 million, subject to forfeitures), based on the portion of the 2014 Outperformance Plan granted as of September 30, 2017, will be amortized into earnings through the final vesting period. We recorded compensation expense of $1.9 million and $8.2 million for the three and nine months ended September 30, 2017, respectively, related to the 2014 Outperformance Plan. We recorded compensation expense of $1.8 million and $6.6 million for the three and nine months ended September 30, 2016, respectively, related to the 2014 Outperformance Plan.

Deferred Compensation Plan for Directors

Under our Non-Employee Director's Deferral Program, which commenced July 2004, the Company's non-employee directors may elect to defer up to 100% of their annual retainer fee, chairman fees, meeting fees and annual stock grant. Unless otherwise elected by a participant, fees deferred under the program shall be credited in the form of phantom stock units. The program provides that a director's phantom stock units generally will be settled in an equal number of shares of common stock upon the earlier of (i) the January 1 coincident with or the next following such director's termination of service from the Board of Directors or (ii) a change in control by us, as defined by the program. Phantom stock units are credited to each non-employee director quarterly using the closing price of SL Green's common stock on the first business day of the respective quarter. Each participating non-employee director is also credited with dividend equivalents or phantom stock units based on the dividend rate for each quarter, which are either paid in cash currently or credited to the director’s account as additional phantom stock units.

During the nine months ended September 30, 2017, 11,510 phantom stock units and 9,171 shares of common stock were issued to our board of directors. We recorded compensation expense of $0.1 million and $2.2 million during the three and nine months ended September 30, 2017, respectively, related to the Deferred Compensation Plan. We recorded compensation expense of $0.1 million and $1.9 million during the three and nine months ended September 30, 2016, respectively, related to the Deferred Compensation Plan.

As of September 30, 2017, there were 98,637 phantom stock units outstanding pursuant to our Non-Employee Director's Deferral Program.

Employee Stock Purchase Plan

In 2007, the Company's board of directors adopted the 2008 Employee Stock Purchase Plan, or ESPP, to encourage our employees to increase their efforts to make our business more successful by providing equity-based incentives to eligible employees. The ESPP is intended to qualify as an "employee stock purchase plan" under Section 423 of the Code, and has been adopted by the board to enable our eligible employees to purchase the Company's shares of common stock through payroll deductions. The ESPP became effective on January 1, 2008 with a maximum of 500,000 shares of the common stock available for issuance, subject to adjustment upon a merger, reorganization, stock split or other similar corporate change. The Company filed a registration statement on Form S-8 with the SEC with respect to the ESPP. The common stock is offered for purchase through a series of successive offering periods. Each offering period will be three months in duration and will begin on the first day of each calendar quarter, with the first offering period having commenced on January 1, 2008. The ESPP provides for eligible employees to purchase the common stock at a purchase price equal to 85% of the lesser of (1) the market value of the common stock on the first day of the offering period or (2) the market value of the common stock on the last day of the offering period. The ESPP was approved by our stockholders at our 2008 annual meeting of stockholders. As of September 30, 2017, 101,882 shares of SL Green's common stock had been issued under the ESPP.

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Accumulated Other Comprehensive Income

9 Months Ended

Sep. 30, 2017

Accumulated Other Comprehensive Income (Loss) [Line Items]

Accumulated Other Comprehensive Income

Stockholders’ Equity of the Company

Common Stock

Our authorized capital stock consists of 260,000,000 shares, $0.01 par value per share, consisting of 160,000,000 shares of common stock, $0.01 par value per share, 75,000,000 shares of excess stock, at $0.01 par value per share, and 25,000,000 shares of preferred stock, par value $0.01 per share. As of September 30, 2017, 97,445,509 shares of common stock and no shares of excess stock were issued and outstanding.

In August 2016, our board of directors approved a stock repurchase plan under which we can buy up to $1.0 billion of shares of our common stock. At September 30, 2017, repurchases made under the stock repurchase plans were as follows:

Period	Total number of shares purchased	Average price paid per share	Total number of shares purchased as part of the repurchase plan or programs	Maximum approximate dollar value of shares that may yet be purchased under the plan (in millions)
First quarter 2017	982	$103.89	982	$999.9
Second quarter 2017	2,447,153	$103.41	2,448,135	$746.8
Third quarter 2017	951,866	$101.67	3,400,001	$650.0

Perpetual Preferred Stock

We have 9,200,000 shares of our 6.50% Series I Cumulative Redeemable Preferred Stock, or the Series I Preferred Stock, outstanding with a mandatory liquidation preference of $25.00 per share. The Series I Preferred stockholders receive annual dividends of $1.625 per share paid on a quarterly basis and dividends are cumulative, subject to certain provisions. We are entitled to redeem the Series I Preferred Stock at par for cash at our option. In August 2012, we received $221.9 million in net proceeds from the issuance of the Series I Preferred Stock, which were recorded net of underwriters' discount and issuance costs, and contributed the net proceeds to the Operating Partnership in exchange for 9,200,000 units of 6.50% Series I Cumulative Redeemable Preferred Units of limited partnership interest, or the Series I Preferred Units.

Dividend Reinvestment and Stock Purchase Plan

In February 2015, the Company filed a registration statement with the SEC for our dividend reinvestment and stock purchase plan, or DRSPP, which automatically became effective upon filing. The Company registered 3,500,000 shares of SL Green's common stock under the DRSPP. The DRSPP commenced on September 24, 2001.

Earnings per Share

SL Green's earnings per share for the three and nine months ended September 30, 2017 and 2016 are computed as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
Numerator	2017		2016		2017		2016
Basic Earnings:
Income attributable to SL Green common stockholders	$	38,869	$	34,252	$	58,442	$	190,930
Effect of Dilutive Securities:
Redemption of units to common shares	1,812		1,663		2,707		8,171
Diluted Earnings:
Income attributable to SL Green common stockholders	$	40,681	$	35,915	$	61,149	$	199,101

	Three Months Ended September 30,		Nine Months Ended September 30,
Denominator	2017	2016	2017	2016
Basic Shares:
Weighted average common stock outstanding	97,783	100,233	99,431	100,140
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares	4,543	4,497	4,570	4,272
Stock-based compensation plans	244	413	279	349
Diluted weighted average common stock outstanding	102,570	105,143	104,280	104,761

SL Green has excluded 1,175,708 and 1,076,695 common stock equivalents from the diluted shares outstanding for the three and nine months ended September 30, 2017, respectively, as they were anti-dilutive. SL Green has excluded 673,298 and 753,344 common stock equivalents from the diluted shares outstanding for the three and nine months ended September 30, 2016, respectively, as they were anti-dilutive.

SL Green Realty Corp

Accumulated Other Comprehensive Income (Loss) [Line Items]

Accumulated Other Comprehensive Income

Accumulated Other Comprehensive Income

The following tables set forth the changes in accumulated other comprehensive income (loss) by component as of September 30, 2017 (in thousands):

	Net unrealized gain on derivative instruments (1)			SL Green’s share of joint venture net unrealized gain on derivative instruments (2)			Net unrealized gain on marketable securities			Total
Balance at December 31, 2016	$	12,596		$	4,021		$	5,520		$	22,137
Other comprehensive (loss) before reclassifications	(4,669		)	(947		)	(1,133		)	(6,749		)
Amounts reclassified from accumulated other comprehensive income	1,336			591			(3,130		)	(1,203		)
Balance at September 30, 2017	$	9,263		$	3,665		$	1,257		$	14,185

(1) Amount reclassified from accumulated other comprehensive income (loss) is included in interest expense in the respective consolidated statements of operations. As of September 30, 2017 and December 31, 2016, the deferred net losses from these terminated hedges, which is included in accumulated other comprehensive loss relating to net unrealized loss on derivative instrument, was $3.7 million and $7.1 million, respectively.

(2) Amount reclassified from accumulated other comprehensive income (loss) is included in equity in net income from unconsolidated joint ventures in the respective consolidated statements of operations.

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Fair Value Measurements

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

We are required to disclose fair value information with regard to our financial instruments, whether or not recognized in the consolidated balance sheets, for which it is practical to estimate fair value. The FASB guidance defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants on the measurement date. We measure and/or disclose the estimated fair value of financial assets and liabilities based on a hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity and the reporting entity’s own assumptions about market participant assumptions. This hierarchy consists of three broad levels: Level 1 - quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date; Level 2 - inputs other than quoted prices included within Level 1, that are observable for the asset or liability, either directly or indirectly; and Level 3 - unobservable inputs for the asset or liability that are used when little or no market data is available. We follow this hierarchy for our assets and liabilities measured at fair value on a recurring and nonrecurring basis. In instances in which the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level of input that is significant to the fair value measurement in its entirety. Our assessment of the significance of the particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability.

The following tables set forth the assets and liabilities that we measure at fair value on a recurring and non-recurring basis by their levels in the fair value hierarchy at September 30, 2017 and December 31, 2016 (in thousands):

	September 30, 2017
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities	$	28,802	$	—	$	28,802	$	—
Interest rate cap and swap agreements (included in other assets)	$	13,727	$	—	$	13,727	$	—

	December 31, 2016
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities	$	85,110	$	48,315	$	36,795	$	—
Interest rate cap and swap agreements (included in other assets)	$	21,090	$	—	$	21,090	$	—
Liabilities:
Interest rate cap and swap agreements (included in accrued interest payable and other liabilities)	$	1	$	—	$	1	$	—

We determine other than temporary impairment in real estate investments and debt and preferred equity investments, including intangibles primarily utilizing cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, as well as sales comparison approach, which utilizes comparable sales, listings and sales contracts. All of which are classified as Level 3 inputs.

As of September 30, 2017, we held notes receivable totaling $250.0 million, which were purchased at par, and were in maturity default at the time of acquisition. In August 2017, the Company determined that it was probable that the loans would not be repaid in full and therefore, the loans were put on non-accrual status. The Company has initiated proceedings to foreclose on the property, and expects to take control of the property unless the buyer is able to repay the principal and interest, including default interest and fees, on the notes receivable in full prior to the completion of the foreclosure process. We believe the collateral value is sufficient to recover the carrying amounts of the notes receivable.

The marketable securities classified as Level 1 were derived from quoted prices in active markets. The valuation technique used to measure the fair value of the marketable securities classified as Level 2 were valued based on quoted market prices or model driven valuations using the significant inputs derived from or corroborated by observable market data. Marketable securities in an unrealized loss position are not considered to be other than temporarily impaired. We do not intend to sell these securities and it is not more likely than not that we will be required to sell the investments before recovery of their amortized cost bases.

The fair value of derivative instruments is based on current market data received from financial sources that trade such instruments and are based on prevailing market data and derived from third party proprietary models based on well-recognized financial principles and reasonable estimates about relevant future market conditions, which are classified as Level 2 inputs.

The financial assets and liabilities that are not measured at fair value on our consolidated balance sheets include cash and cash equivalents, restricted cash, accounts receivable, accounts payable and accrued expenses, debt and preferred equity investments, mortgages and other loans payable and other secured and unsecured debt. The carrying amount of cash and cash equivalents, restricted cash, accounts receivable, and accounts payable and accrued expenses reported in our consolidated balance sheets approximates fair value due to the short term nature of these instruments. The fair value of debt and preferred equity investments, which is classified as Level 3, is estimated by discounting the future cash flows using current interest rates at which similar loans with the same maturities would be made to borrowers with similar credit ratings. The fair value of borrowings, which is classified as Level 3, is estimated by discounting the contractual cash flows of each debt instrument to their present value using adjusted market interest rates, which is provided by a third-party specialist.

The following table provides the carrying value and fair value of these financial instruments as of September 30, 2017 and December 31, 2016 (in thousands):

	September 30, 2017				December 31, 2016
	Carrying Value (1)		Fair Value		Carrying Value (1)		Fair Value
Debt and preferred equity investments	$	2,020,739	(2)		$	1,640,412	(2)
Fixed rate debt	$	5,154,810	$	5,398,870	$	5,452,084	$	5,722,494
Variable rate debt	1,321,813		1,314,223		1,105,585		1,110,110
	$	6,476,623	$	6,713,093	$	6,557,669	$	6,832,604

(1) Amounts exclude net deferred financing costs.

(2) At September 30, 2017, debt and preferred equity investments had an estimated fair value ranging between $2.0 billion and $2.2 billion. At December 31, 2016, debt and preferred equity investments had an estimated fair value ranging between $1.6 billion and $1.8 billion.

Disclosure about fair value of financial instruments was based on pertinent information available to us as of September 30, 2017 and December 31, 2016. Although we are not aware of any factors that would significantly affect the reasonable fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since that date and current estimates of fair value may differ significantly from the amounts presented herein.

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Financial Instruments: Derivatives and Hedging

9 Months Ended

Sep. 30, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Financial Instruments: Derivatives and Hedging

Financial Instruments: Derivatives and Hedging

In the normal course of business, we use a variety of commonly used derivative instruments, such as interest rate swaps, caps, collar and floors, to manage, or hedge interest rate risk. We hedge our exposure to variability in future cash flows for forecasted transactions in addition to anticipated future interest payments on existing debt. We recognize all derivatives on the balance sheets at fair value. Derivatives that are not hedges are adjusted to fair value through earnings. If a derivative is a hedge, depending on the nature of the hedge, changes in the fair value of the derivative will either be offset against the change in fair value of the hedge asset, liability, or firm commitment through earnings, or recognized in other comprehensive income until the hedged item is recognized in earnings. The ineffective portion of a derivative's change in fair value will be immediately recognized in earnings. Reported net income and equity may increase or decrease prospectively, depending on future levels of interest rates and other variables affecting the fair values of derivative instruments and hedged items, but will have no effect on cash flows. Currently, all of our designated derivative instruments are effective hedging instruments.

The following table summarizes the notional value at inception and fair value of our consolidated derivative financial instruments at September 30, 2017 based on Level 2 information. The notional value is an indication of the extent of our involvement in these instruments at that time, but does not represent exposure to credit, interest rate or market risks (amounts in thousands).

	Notional Value		Strike Rate		Effective Date	Expiration Date	Balance Sheet Location	Fair Value
Interest Rate Swap	$	200,000	0.938	%	October 2014	December 2017	Other Assets	$	105
Interest Rate Swap	150,000		0.940	%	October 2014	December 2017	Other Assets	78
Interest Rate Swap	150,000		0.940	%	October 2014	December 2017	Other Assets	78
Interest Rate Cap	137,500		4.000	%	September 2017	September 2019	Other Assets	4
Interest Rate Swap	200,000		1.131	%	July 2016	July 2023	Other Assets	8,998
Interest Rate Swap	100,000		1.161	%	July 2016	July 2023	Other Assets	4,335
Interest Rate Swap	100,000		2.287	%	November 2017	November 2027	Other Assets	129
								$	13,727

During both the three and nine months ended September 30, 2017, we recorded a loss on the changes in the fair value of $0.1 million, which is included in interest expense on the consolidated statements of operations. During the three and nine months ended September 30, 2016, we recorded a $0.1 million loss and a $0.5 million gain, respectively, on the changes in the fair value, which is included in interest expense on the consolidated statements of operations.

The Company has agreements with each of its derivative counterparties that contain a provision where if the Company either defaults or is capable of being declared in default on any of its indebtedness, then the Company could also be declared in default on its derivative obligations. As of September 30, 2017, the fair value of derivatives in a net liability position including accrued interest but excluding any adjustment for nonperformance risk related to these agreements was zero. As of September 30, 2017, the Company has not posted any collateral related to these agreements and was not in breach of any agreement provisions. If the Company had breached any of these provisions, it could have been required to settle its obligations under the agreements at their aggregate termination value of zero at September 30, 2017.

Gains and losses on terminated hedges are included in accumulated other comprehensive loss, and are recognized into earnings over the term of the related mortgage obligation. Over time, the realized and unrealized gains and losses held in accumulated other comprehensive loss will be reclassified into earnings as an adjustment to interest expense in the same periods in which the hedged interest payments affect earnings. We estimate that $0.8 million of the current balance held in accumulated other comprehensive loss will be reclassified into interest expense and $0.3 million of the portion related to our share of joint venture accumulated other comprehensive loss will be reclassified into equity in net income from unconsolidated joint ventures within the next 12 months.

The following table presents the effect of our derivative financial instruments and our share of our joint ventures' derivative financial instruments that are designated and qualify as hedging instruments on the consolidated statements of operations for the three months ended September 30, 2017 and 2016, respectively (in thousands):

	Amount of (Loss) Recognized in Other Comprehensive Loss (Effective Portion)						Location of (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income	Amount of Loss  Reclassified from Accumulated Other Comprehensive Loss  into Income (Effective Portion)				Location of (Loss) Recognized in Income on Derivative	Amount of (Loss) Gain Recognized into Income (Ineffective Portion)
	Three Months Ended September 30,							Three Months Ended September 30,					Three Months Ended September 30,
Derivative	2017			2016				2017		2016			2017			2016
Interest Rate Swaps/Caps	$	(304	)	$	(7	)	Interest expense	$	85	$	1,442	Interest expense	$	4		$	—
Share of unconsolidated joint ventures' derivative instruments	(290		)	(222		)	Equity in net income from unconsolidated joint ventures	185		547		Equity in net income from unconsolidated joint ventures	(48		)	830
	$	(594	)	$	(229	)		$	270	$	1,989		$	(44	)	$	830

The following table presents the effect of our derivative financial instruments and our share of our joint ventures' derivative financial instruments that are designated and qualify as hedging instruments on the consolidated statements of operations for the nine months ended September 30, 2017 and 2016, respectively (in thousands):

	Amount of (Loss) Recognized in Other Comprehensive Loss (Effective Portion)						Location of (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income	Amount of Loss  Reclassified from Accumulated Other Comprehensive Loss  into Income (Effective Portion)				Location of (Loss) Recognized in Income on Derivative	Amount of (Loss) Recognized into Income (Ineffective Portion)
	Nine Months Ended September 30,							Nine Months Ended September 30,					Nine Months Ended September 30,
Derivative	2017			2016				2017		2016			2017			2016
Interest Rate Swaps/Caps	$	(5,477	)	$	(8,112	)	Interest expense	$	1,583	$	8,073	Interest expense	$	(4	)	$	(38	)
Share of unconsolidated joint ventures' derivative instruments	(1,277		)	(5,992		)	Equity in net income from unconsolidated joint ventures	876		1,465		Equity in net income from unconsolidated joint ventures	(109		)	(206		)
	$	(6,754	)	$	(14,104	)		$	2,459	$	9,538		$	(113	)	$	(244	)

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Legal Proceedings

As of September 30, 2017, the Company and the Operating Partnership were not involved in any material litigation nor, to management's knowledge, was any material litigation threatened against us or our portfolio which if adversely determined could have a material adverse impact on us.

Environmental Matters

Our management believes that the properties are in compliance in all material respects with applicable Federal, state and local ordinances and regulations regarding environmental issues. Management is not aware of any environmental liability that it believes would have a materially adverse impact on our financial position, results of operations or cash flows. Management is unaware of any instances in which it would incur significant environmental cost if any of our properties were sold.

Capital and Ground Leases Arrangements

The following is a schedule of future minimum lease payments under capital leases and non-cancellable operating leases with initial terms in excess of one year as of September 30, 2017 (in thousands):

	Capital lease			Non-cancellable operating leases
Remaining 2017	$	597		$	7,763
2018	2,387			31,049
2019	2,411			31,066
2020	2,620			31,436
2021	2,794			31,628
Thereafter	822,688			732,724
Total minimum lease payments	$	833,497		$	865,666
Amount representing interest	(790,837		)
Capital lease obligations	$	42,660

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Segment Information

9 Months Ended

Sep. 30, 2017

Segment Reporting [Abstract]

Segment Information

Segment Information

The Company is a REIT with in-house capabilities in commercial and residential property management, acquisitions and dispositions, financing, development and redevelopment, construction and leasing in the New York Metropolitan area, and has two reportable segments, real estate and debt and preferred equity investments. We evaluate real estate performance and allocate resources based on earnings contribution to income from continuing operations.

The primary sources of revenue are generated from tenant rents and escalations and reimbursement revenue. Real estate property operating expenses consist primarily of security, maintenance, utility costs, insurance, real estate taxes and ground rent expense (at certain applicable properties). See Note 5, "Debt and Preferred Equity Investments," for additional details on our debt and preferred equity investments.

Selected consolidated results of operations for the three and nine months ended September 30, 2017 and 2016, and selected asset information as of September 30, 2017 and December 31, 2016, regarding our operating segments are as follows (in thousands):

	Real Estate Segment			Debt and Preferred Equity Segment		Total Company
Total revenues
Three months ended:
September 30, 2017	$	326,780		$	47,820	$	374,600
September 30, 2016	341,285			75,396		416,681
Nine months ended:
September 30, 2017	1,001,390			148,741		1,150,131
September 30, 2016	1,315,392			174,347		1,489,739
Net income (loss) before 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, and gain on sale of investment in marketable securities
Three months ended:
September 30, 2017	$	4,873		$	39,892	$	44,765
September 30, 2016	(32,731		)	75,452		42,721
Nine months ended:
September 30, 2017	(504		)	132,402		131,898
September 30, 2016	(187,222		)	168,295		(18,927		)
Total assets
As of:
September 30, 2017	$	12,939,363		$	2,170,507	$	15,109,870
December 31, 2016	13,868,672			1,989,115		15,857,787

Income from continuing operations represents total revenues less total expenses for the real estate segment and total investment income less allocated interest expense for the debt and preferred equity segment. Interest costs for the debt and preferred equity segment includes actual costs incurred for borrowings on the 2016 MRA and 2017 MRA. Interest is imputed on the investments that do not collateralize the 2016 MRA or 2017 MRA using our corporate borrowing cost. We also allocate loan loss reserves, net of recoveries, and transaction related costs to the debt and preferred equity segment. We do not allocate marketing, general and administrative expenses to the debt and preferred equity segment since the use of personnel and resources is dependent on transaction volume between the two segments and varies period over period. In addition, we base performance on the individual segments prior to allocating marketing, general and administrative expenses. For the three and nine months ended September 30, 2017, marketing, general and administrative expenses totaled $24.0 million, and $72.4 million respectively. For the three and nine months ended September 30, 2016, marketing, general and administrative expenses totaled $25.5 million and $74.0 million, respectively. All other expenses, except interest, relate entirely to the real estate assets.

There were no transactions between the above two segments.

The table below reconciles income from continuing operations to net income for the three and nine months ended September 30, 2017 and 2016 (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017			2016
Net income (loss) before 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, and gain on sale of investment in marketable securities	$	44,765	$	42,721	$	131,898		$	(18,927	)
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	—		397		(3,256		)	210,750
Depreciable real estate reserves	—		—		(85,336		)	(10,387		)
Gain (loss) on sale of investment in marketable securities	—		—		3,262			(83		)
Net income	$	45,795	$	43,343	$	62,734		$	224,941

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Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Principles of Consolidation

Principles of Consolidation

The consolidated financial statements include our accounts and those of our subsidiaries, which are wholly-owned or controlled by us. Entities which we do not control through our voting interest and entities which are variable interest entities, but where we are not the primary beneficiary, are accounted for under the equity method. See Note 5, "Debt and Preferred Equity Investments" and Note 6, "Investments in Unconsolidated Joint Ventures." All significant intercompany balances and transactions have been eliminated.

We consolidate a variable interest entity, or VIE, in which we are considered the primary beneficiary. The primary beneficiary is the entity that has (i) the power to direct the activities that most significantly impact the entity's economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE.

Investment in Commercial Real Estate Properties

Investment in Commercial Real Estate Properties

On a periodic basis, we assess whether there are any indications that the value of our real estate properties may be other than temporarily impaired or that their carrying value may not be recoverable. A property's value is considered impaired if management's estimate of the aggregate future cash flows (undiscounted) to be generated by the property is less than the carrying value of the property. To the extent impairment has occurred, the loss will be measured as the excess of the carrying amount of the property over the calculated fair value of the property. We also evaluate our real estate properties for potential impairment when a real estate property has been classified as held for sale. Real estate assets held for sale are valued at the lower of either their carrying value or fair value less costs to sell. We do not believe that there were any indicators of impairment at any of our consolidated properties at September 30, 2017. We recorded no depreciable real estate reserves for the three months ended September 30, 2017, and aggregate depreciable real estate reserves of $85.3 million for the nine months ended September 30, 2017. See Note 4, "Property Dispositions".

We allocate the purchase price of real estate to land and building (inclusive of tenant improvements) and, if determined to be material, intangibles, such as the value of above- and below-market leases and origination costs associated with the in-place leases. We depreciate the amount allocated to building (inclusive of tenant improvements) over their estimated useful lives, which generally range from three to 40 years. We amortize the amount allocated to the above- and below-market leases over the remaining term of the associated lease, which generally range from one to 14 years, and record it as either an increase (in the case of below-market leases) or a decrease (in the case of above-market leases) to rental income. We amortize the amount allocated to the values associated with in-place leases over the expected term of the associated lease, which generally ranges from one to 14 years. If a tenant vacates its space prior to the contractual termination of the lease and no rental payments are being made on the lease, any unamortized balance of the related intangible will be written off. The tenant improvements and origination costs are amortized as an expense over the remaining life of the lease (or charged against earnings if the lease is terminated prior to its contractual expiration date). We assess fair value of the leases based on estimated cash flow projections that utilize appropriate discount and capitalization rates and available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known trends, and market/economic conditions that may affect the property. To the extent acquired leases contain fixed rate renewal options that are below-market and determined to be material, we amortize such below-market lease value into rental income over the renewal period.

Fair Value Measurements

Fair Value Measurements

We are required to disclose fair value information with regard to our financial instruments, whether or not recognized in the consolidated balance sheets, for which it is practical to estimate fair value. The FASB guidance defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants on the measurement date. We measure and/or disclose the estimated fair value of financial assets and liabilities based on a hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity and the reporting entity’s own assumptions about market participant assumptions. This hierarchy consists of three broad levels: Level 1 - quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date; Level 2 - inputs other than quoted prices included within Level 1, that are observable for the asset or liability, either directly or indirectly; and Level 3 - unobservable inputs for the asset or liability that are used when little or no market data is available. We follow this hierarchy for our assets and liabilities measured at fair value on a recurring and nonrecurring basis. In instances in which the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level of input that is significant to the fair value measurement in its entirety. Our assessment of the significance of the particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability.

We determine other than temporary impairment in real estate investments and debt and preferred equity investments, including intangibles primarily utilizing cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, as well as sales comparison approach, which utilizes comparable sales, listings and sales contracts. All of which are classified as Level 3 inputs.

As of September 30, 2017, we held notes receivable totaling $250.0 million, which were purchased at par, and were in maturity default at the time of acquisition. In August 2017, the Company determined that it was probable that the loans would not be repaid in full and therefore, the loans were put on non-accrual status. The Company has initiated proceedings to foreclose on the property, and expects to take control of the property unless the buyer is able to repay the principal and interest, including default interest and fees, on the notes receivable in full prior to the completion of the foreclosure process. We believe the collateral value is sufficient to recover the carrying amounts of the notes receivable.

The marketable securities classified as Level 1 were derived from quoted prices in active markets. The valuation technique used to measure the fair value of the marketable securities classified as Level 2 were valued based on quoted market prices or model driven valuations using the significant inputs derived from or corroborated by observable market data. Marketable securities in an unrealized loss position are not considered to be other than temporarily impaired. We do not intend to sell these securities and it is not more likely than not that we will be required to sell the investments before recovery of their amortized cost bases.

The fair value of derivative instruments is based on current market data received from financial sources that trade such instruments and are based on prevailing market data and derived from third party proprietary models based on well-recognized financial principles and reasonable estimates about relevant future market conditions, which are classified as Level 2 inputs.

The financial assets and liabilities that are not measured at fair value on our consolidated balance sheets include cash and cash equivalents, restricted cash, accounts receivable, accounts payable and accrued expenses, debt and preferred equity investments, mortgages and other loans payable and other secured and unsecured debt. The carrying amount of cash and cash equivalents, restricted cash, accounts receivable, and accounts payable and accrued expenses reported in our consolidated balance sheets approximates fair value due to the short term nature of these instruments. The fair value of debt and preferred equity investments, which is classified as Level 3, is estimated by discounting the future cash flows using current interest rates at which similar loans with the same maturities would be made to borrowers with similar credit ratings. The fair value of borrowings, which is classified as Level 3, is estimated by discounting the contractual cash flows of each debt instrument to their present value using adjusted market interest rates, which is provided by a third-party specialist.

Investment in Marketable Securities

Investment in Marketable Securities

At acquisition, we designate a security as held-to-maturity, available-for-sale, or trading. As of September 30, 2017, we did not have any securities designated as held-to-maturity or trading. We account for our available-for-sale securities at fair value pursuant to Accounting Standards Codification, or ASC, 820-10, with the net unrealized gains or losses reported as a component of accumulated other comprehensive income or loss. Any unrealized losses that are determined to be other-than-temporary are recognized in earnings up to their credit component.

The cost of bonds and marketable securities sold is determined using the specific identification method.

Investments in Unconsolidated Joint Ventures

Investments in Unconsolidated Joint Ventures

We assess our investments in unconsolidated joint ventures for recoverability, and if it is determined that a loss in value of the investment is other than temporary, we write down the investment to its fair value. We evaluate our equity investments for impairment based on the joint ventures' projected discounted cash flows.

Reserve for Possible Credit Losses

Reserve for Possible Credit Losses

The expense for possible credit losses in connection with debt and preferred equity investments is the charge to earnings to increase the allowance for possible credit losses to the level that we estimate to be adequate, based on Level 3 data, considering delinquencies, loss experience and collateral quality. Other factors considered include geographic trends, product diversification, the size of the portfolio and current economic conditions. Based upon these factors, we establish a provision for possible credit loss on each individual investment. When it is probable that we will be unable to collect all amounts contractually due, the investment is considered impaired.

Where impairment is indicated on an investment that is held to maturity, a valuation allowance is measured based upon the excess of the recorded investment amount over the net fair value of the collateral. Any deficiency between the carrying amount of an asset and the calculated value of the collateral is charged to expense. We continue to assess or adjust our estimates based on circumstances of a loan and the underlying collateral. If additional information reflects increased recovery of our investment, we will adjust our reserves accordingly.

Income Taxes

Income Taxes

SL Green is taxed as a REIT under Section 856(c) of the Code. As a REIT, SL Green generally is not subject to Federal income tax. To maintain its qualification as a REIT, SL Green must distribute at least 90% of its REIT taxable income to its stockholders and meet certain other requirements. If SL Green fails to qualify as a REIT in any taxable year, SL Green will be subject to Federal income tax on SL Green's taxable income at regular corporate rates. SL Green may also be subject to certain state, local and franchise taxes. Under certain circumstances, Federal income and excise taxes may be due on SL Green's undistributed taxable income.

The Operating Partnership is a partnership and, as a result, all income and losses of the partnership are allocated to the partners for inclusion in their respective income tax returns. The only provision for income taxes included in the consolidated statements of operations relates to the Operating Partnership’s consolidated taxable REIT subsidiaries. The Operating Partnership may also be subject to certain state, local and franchise taxes.

Pursuant to amendments to the Code that became effective January 1, 2001, we have elected, and may elect in the future, to treat certain of our existing or newly created corporate subsidiaries as taxable REIT subsidiaries, or TRSs. In general, TRSs may perform non-customary services for the tenants of the Company, hold assets that we cannot hold directly and generally may engage in any real estate or non-real estate related business. The TRSs generate income, resulting in Federal and state income tax liability for these entities.

During the three and nine months ended September 30, 2017, we recorded Federal, state and local tax provisions of $0.1 million and $2.8 million, respectively.

We follow a two-step approach for evaluating uncertain tax positions. Recognition (step one) occurs when an enterprise concludes that a tax position, based solely on its technical merits, is more-likely-than-not to be sustained upon examination. Measurement (step two) determines the amount of benefit that is more-likely-than-not to be realized upon settlement. Derecognition of a tax position that was previously recognized would occur when a company subsequently determines that a tax position no longer meets the more-likely-than-not threshold of being sustained. The use of a valuation allowance as a substitute for derecognition of tax positions is prohibited.

Use of Estimates

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

Concentrations of Credit Risk

Concentrations of Credit Risk

Financial instruments that potentially subject us to concentrations of credit risk consist primarily of cash investments, debt and preferred equity investments and accounts receivable. We place our cash investments with high quality financial institutions. The collateral securing our debt and preferred equity investments is located in New York City. See Note 5, "Debt and Preferred Equity Investments."

We perform ongoing credit evaluations of our tenants and require most tenants to provide security deposits or letters of credit. Though these security deposits and letters of credit are insufficient to meet the total value of a tenant's lease obligation, they are a measure of good faith and a source of funds to offset the economic costs associated with lost revenue and the costs associated with re-tenanting a space.

Reclassification

Reclassification

Certain prior year balances have been reclassified to conform to our current year presentation.

Accounting Standards Updates

resentation.

Accounting Standards Updates

In August 2017, the FASB issued Accounting Standards Update (ASU) No. 2017-12, Derivatives and Hedging (Topic 815), Targeted Improvements to Accounting for Hedging Activities. The amendments in the new standard will permit more flexibility in hedging interest rate risk for both variable rate and fixed rate financial instruments. The standard will also enhance the presentation of hedge results in the financial statements. The guidance is effective for fiscal years beginning after December 15, 2018 and early adoption is permitted. The Company has not yet adopted the guidance, and does not expect a material impact on the Company’s consolidated financial statements when the new standard is implemented.

In May 2017, the FASB issued Accounting Standards Update (ASU) No. 2017-09, Compensation - Stock Compensation (Topic 718), Scope of Modification Accounting. The guidance clarifies the changes to the terms or conditions of a share-based payment award that require an entity to apply modification accounting in Topic 718. The guidance is effective for fiscal years beginning after December 15, 2017 and early adoption is permitted. The Company has not yet adopted the guidance.

In February 2017, the FASB issued Accounting Standards Update (ASU) No. 2017-05 to clarify the scope of Subtopic 610-20 as well as provide guidance on accounting for partial sales of nonfinancial assets. Subtopic 610-20 was issued in May 2014 as part of ASU 2014-09. The Company anticipates adopting this guidance January 1, 2018, and applying the modified retrospective approach. The Company is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements.

In January, 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. The guidance clarifies the definition of a business and provides guidance to assist with determining whether transactions should be accounted for as acquisitions of assets or businesses. The main provision is that an acquiree is not a business if substantially all of the fair value of the gross assets is concentrated in a single identifiable asset or group of assets. The Company adopted the guidance on the issuance date effective January 5, 2017. The Company expects that most of our real estate acquisitions will be considered asset acquisitions under the new guidance and that transaction costs will be capitalized to the investment basis which is then subject to a purchase price allocation based on relative fair value.

In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. The guidance will require entities to show the changes on the total cash, cash equivalents, restricted cash and restricted cash equivalents in the statement of cash flows. As a result, entities will no longer present transfers between these items on the statement of cash flows. The guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements.

In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. The ASU provides final guidance on eight cash flow issues, including debt prepayment or debt extinguishment costs, contingent consideration payments made after a business combination, distributions received from equity method investees, separately identifiable cash flows and application of the predominance principle, and others. The amendments in the ASU are effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. The Company adopted the guidance effective January 1, 2017 and there was no impact on the Company’s consolidated financial statements.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The guidance changes how entities will measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. The guidance replaces the current ‘incurred loss’ model with an ‘expected loss’ approach. The guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted after December 2018. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements.

In March 2016, the FASB issued ASU No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. The guidance simplifies the accounting for share-based payment award transactions including: income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. The guidance is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted. The Company adopted the guidance effective January 1, 2017 and there was no material impact on the Company’s consolidated financial statements.

In March 2016, the FASB issued ASU 2016-07, Investments Equity Method and Joint Ventures (Topic 323). The guidance eliminates the requirement that an entity retroactively adopt the equity method of accounting if an investment qualifies for use of the equity method as a result of an increase in the level of ownership or degree of influence. The amendments require that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor’s previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. The Company adopted the guidance effective January 1, 2017 and there was no impact on the Company’s consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, Leases. The guidance requires lessees to recognize lease assets and lease liabilities for those leases classified as operating leases under the previous standard. Depending on the lease classification, lessees will recognize expense based on the effective interest method for finance leases or on a straight-line basis for operating leases. The accounting applied by a lessor is largely unchanged from that applied under the previous standard. One of the impacts on the Company will be the presentation and disclosure in the financial statements of non-lease components such as charges to tenants for a building’s operating expenses. The non-lease components will be presented separately from the lease components in both the Consolidated Statements of Operations and Consolidated Balance Sheets. Another impact is the measurement and presentation of ground leases under which the Company is lessee. The Company is required to record a liability for the obligation to make payments under the lease and an asset for the right to use the underlying asset during the lease term and will also apply the new expense recognition requirements given the lease classification. The Company is currently quantifying these impacts. The guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. The Company anticipates adopting this guidance January 1, 2019 and will apply the modified retrospective approach.

In January 2016, the FASB issued ASU 2016-01 (Subtopic 825-10), Recognition and Measurement of Financial Assets and Financial Liabilities. The guidance requires entities to measure equity investments that do not result in consolidation and are not accounted for under the equity method at fair value and to record changes in instruments-specific credit risk for financial liabilities measured under the fair value option in other comprehensive income. The guidance is effective for fiscal years beginning after December 15, 2017, and for interim periods therein. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements.

In May 2014, the FASB issued a new comprehensive revenue recognition guidance which requires us to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which we expect to be entitled in exchange for those goods and services (ASU 2014-09). The FASB also issued implementation guidance in March 2016, April 2016 and May 2016 - ASU’s 2016-08, 2016-10 and 2016-12, respectively.

These ASUs are effective for annual and interim periods beginning after December 15, 2017. The Company will adopt this guidance January 1, 2018. Since the Company’s revenue is related to leasing activities, the adoption of this guidance will not have a material impact on the consolidated financial statements. The new guidance is applicable to service contracts with joint ventures for which the Company earns property management fees, leasing commissions and development and construction fees. The adoption of this new guidance does not change the accounting for these fees as the pattern of recognition of revenue does not change with the new guidance. We will continue to recognize revenue over time on these contracts because the customer simultaneously receives and consumes the benefits provided by our performance. Thus, the analysis of our contracts under the new revenue recognition standard is consistent with our current revenue recognition model

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Organization and Basis of Presentation (Tables)

9 Months Ended

Sep. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of commercial office properties

As of September 30, 2017, we owned the following interests in properties in the New York Metropolitan area, primarily in midtown Manhattan. Our investments in the New York Metropolitan area also include investments in Brooklyn, Long Island, Westchester County, Connecticut and New Jersey, which are collectively known as the Suburban properties:

		Consolidated			Unconsolidated		Total
Location	Property Type	Number of Properties		Approximate Square Feet (unaudited)	Number of Properties	Approximate Square Feet (unaudited)	Number of Properties	Approximate Square Feet (unaudited)	Weighted Average Occupancy(1) (unaudited)
Commercial:
Manhattan	Office	24		16,054,606	7	6,558,139	31	22,612,745	93.4	%
	Retail	4	(2)	302,583	9	347,970	13	650,553	94.5	%
	Development/Redevelopment	7		158,985	4	770,514	11	929,499	59.9	%
	Fee Interest	1		176,530	1	—	2	176,530	100.0	%
		36		16,692,704	21	7,676,623	57	24,369,327	92.2	%
Suburban	Office	22	(3)(4)	3,608,800	2	640,000	24	4,248,800	83.1	%
	Retail	1		52,000	—	—	1	52,000	100.0	%
	Development/Redevelopment	1		1,000	1	—	2	1,000	100.0	%
		24		3,661,800	3	640,000	27	4,301,800	83.3	%
Total commercial properties		60		20,354,504	24	8,316,623	84	28,671,127	90.8	%
Residential:
Manhattan	Residential	3	(2)	472,105	12	2,656,856	15	3,128,961	86.4	%
Suburban	Residential	—		—	—	—	—	—	—	%
Total residential properties		3		472,105	12	2,656,856	15	3,128,961	86.4	%
Total portfolio(2)(3)		63		20,826,609	36	10,973,479	99	31,800,088	90.4	%

(1) The weighted average occupancy for commercial properties represents the total occupied square feet divided by total square footage at acquisition. The weighted average occupancy for residential properties represents the total occupied units divided by total available units.

(2) As of September 30, 2017, we owned a building at 315 West 33rd Street, also known as The Olivia, that was comprised of approximately 270,132 square feet (unaudited) of retail space and approximately 222,855 square feet (unaudited) of residential space. For the purpose of this report, we have included this building in the number of retail properties we own. However, we have included only the retail square footage in the retail approximate square footage, and have listed the balance of the square footage as residential square footage.

(3) Includes the properties at 16 Court Street in Brooklyn, New York, and 125 Chubb Avenue in Lyndhurst, New Jersey which are classified as held for sale at September 30, 2017. The sales closed in October 2017.

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Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Summary of identified intangible assets (acquired above-market leases and in-place leases) and intangible liabilities (acquired below-market leases)

The following summarizes our identified intangible assets (acquired above-market leases and in-place leases) and intangible liabilities (acquired below-market leases) as of September 30, 2017 and December 31, 2016 (in thousands):

	September 30, 2017			December 31, 2016
Identified intangible assets (included in other assets):
Gross amount	$	474,493		$	651,099
Accumulated amortization	(398,047		)	(410,930		)
Net(1)	$	76,446		$	240,169
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	639,511		$	655,930
Accumulated amortization	(474,365		)	(464,749		)
Net(1)	$	165,146		$	191,181

(1) As of September 30, 2017 and December 31, 2016, $3.9 million and none, respectively and $1.1 million and none, respectively, of net intangible assets and net intangible liabilities, were reclassified to assets held for sale and liabilities related to assets held for sale.

Schedule of marketable securities

At September 30, 2017 and December 31, 2016, we held the following marketable securities (in thousands):

	September 30, 2017		December 31, 2016
Equity marketable securities	$	—	$	48,315
Commercial mortgage-backed securities	28,802		36,795
Total marketable securities available-for-sale	$	28,802	$	85,110

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Properties Held for Sale and Property Dispositions (Tables)

9 Months Ended

Sep. 30, 2017

Discontinued Operations and Disposal Groups [Abstract]

Summary of properties sold

The following table summarizes the properties sold during the nine months ended September 30, 2017:

Property	Disposition Date	Property Type	Approximate Square Feet	Sales Price(1) (in millions)		Gain (loss)(2) (in millions)
885 Third Avenue (3)	February 2016	Fee Interest	607,000	$	453.0	$	(8.8	)
520 White Plains Road	April 2017	Office	180,000	21.0		(14.6		)
102 Greene Street (4)	April 2017	Retail	9,200	43.5		4.9
680-750 Washington Boulevard	July 2017	Office	325,000	97.0		(44.2		)

(1) Sales price represents the gross sales price for a property or the gross asset valuation for interests in a property.

(2) The gain on sale for 102 Greene Street is net of $0.9 million in employee compensation awards accrued in connection with the realization of the investment gain as a bonus to certain employees that were instrumental in realizing the gain on sale. Additionally, gain on sale amounts do not include adjustments for expenses recorded in subsequent periods.

(3) In February 2016, we closed on the sale of 885 Third Avenue. The sale did not meet the criteria for sale accounting and as a result the property remained on our consolidated financial statements until the criteria was met in April 2017.

(4) In April 2017, we closed on the sale of a 90% interest 102 Greene Street and had subsequently accounted for our interest in the property as an investment in unconsolidated joint ventures. We sold the remaining 10% interest in September 2017. See Note 6, "Investments in Unconsolidated Joint Ventures".

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Debt and Preferred Equity Investments (Tables)

9 Months Ended

Sep. 30, 2017

Investments, Debt and Equity Securities [Abstract]

Schedule of debt and preferred equity book balance roll forward

Below is the rollforward analysis of the activity relating to our debt and preferred equity investments as of September 30, 2017 and December 31, 2016 (in thousands):

	September 30, 2017			December 31, 2016
Balance at beginning of period (1)	$	1,640,412		$	1,670,020
Debt Investment Originations/Accretion (2)	944,494			1,009,176
Preferred Equity Investment Originations/Accretion (2)	144,013			5,698
Redemptions/Sales/Syndications/Amortization (3)	(708,180		)	(1,044,482		)
Balance at end of period (1)	$	2,020,739		$	1,640,412

(1) Net of unamortized fees, discounts, and premiums.

(2) Accretion includes amortization of fees and discounts and paid-in-kind investment income.

(3) Certain participations in debt investments that were sold or syndicated did not meet the conditions for sale accounting are included in other assets and other liabilities on the consolidated balance sheets.

Summary of debt investments

As of September 30, 2017 and December 31, 2016, we held the following debt investments with an aggregate weighted average current yield of 9.49%, excluding our investment in Two Herald Square, at September 30, 2017 (in thousands):

Loan Type	September 30, 2017 Future Funding Obligations		September 30, 2017 Senior Financing		September 30, 2017 Carrying Value (1)		December 31, 2016 Carrying Value (1)		Maturity Date (2)
Fixed Rate Investments:
Mortgage/Jr. Mortgage Loan(3)	$	—	$	—	$	250,164	$	—	April 2017
Mortgage Loan(4)	—		—		26,352		26,311		February 2019
Mortgage Loan	—		—		275		380		August 2019
Mezzanine Loan(5a)	—		1,160,000		201,757		—		March 2020
Mezzanine Loan	—		15,000		3,500		3,500		September 2021
Mezzanine Loan	—		147,000		24,909		—		April 2022
Mezzanine Loan	—		87,595		12,697		12,692		November 2023
Mezzanine Loan(5b)	—		115,000		12,930		12,925		June 2024
Mezzanine Loan	—		95,000		30,000		30,000		January 2025
Mezzanine Loan	—		340,000		15,000		15,000		November 2026
Mezzanine Loan	—		1,657,500		55,250		—		June 2027
Mezzanine Loan(6)	—		—		—		66,129
Jr. Mortgage Participation/Mezzanine Loan (7)	—		—		—		193,422
Total fixed rate	$	—	$	3,617,095	$	632,834	$	360,359
Floating Rate Investments:
Mortgage/Mezzanine Loan(8)	622		—		23,372		20,423		October 2017
Mezzanine Loan(5c)	—		85,000		15,340		15,141		December 2017
Mezzanine Loan(5d)	—		65,000		14,832		14,656		December 2017
Mezzanine Loan(5e)	795		—		15,132		15,051		December 2017
Mortgage/Mezzanine Loan(9)	—		125,000		29,966		29,998		January 2018
Mezzanine Loan	—		40,000		19,964		19,913		April 2018
Jr. Mortgage Participation	—		117,808		34,899		34,844		April 2018
Mezzanine Loan	523		20,523		10,916		10,863		August 2018
Mortgage/Mezzanine Loan	—		—		19,914		19,840		August 2018
Mortgage Loan	—		65,000		14,935		14,880		August 2018

Loan Type	September 30, 2017 Future Funding Obligations		September 30, 2017 Senior Financing		September 30, 2017 Carrying Value (1)		December 31, 2016 Carrying Value (1)		Maturity Date (2)
Mortgage/Mezzanine Loan(10)	—		—		16,957		16,960		September 2018
Mezzanine Loan	—		37,500		14,801		14,648		September 2018
Mezzanine Loan	2,325		45,025		34,782		34,502		October 2018
Mezzanine Loan	—		335,000		74,683		74,476		November 2018
Mezzanine Loan	—		33,000		26,907		26,850		December 2018
Mezzanine Loan	1,050		171,939		58,598		56,114		December 2018
Mezzanine Loan	8,267		289,621		71,067		63,137		December 2018
Mezzanine Loan	5,197		229,084		74,314		64,505		December 2018
Mezzanine Loan	—		45,000		12,156		12,104		January 2019
Mortgage/Mezzanine Loan (5f)	30,101		—		158,757		—		January 2019
Mezzanine Loan	6,081		24,086		7,812		5,410		January 2019
Mezzanine Loan	—		38,000		21,927		21,891		March 2019
Mezzanine Loan	279		173,700		36,936		—		April 2019
Mezzanine Loan	—		265,000		24,798		24,707		April 2019
Mortgage/Jr. Mortgage Participation Loan	29,661		194,094		69,705		65,554		August 2019
Mezzanine Loan	2,034		187,500		37,835		37,322		September 2019
Mortgage/Mezzanine Loan	49,933		—		130,350		111,819		September 2019
Mortgage/Mezzanine Loan	30,494		—		38,934		33,682		January 2020
Mezzanine Loan(11)	6,794		537,748		72,597		125,911		January 2020
Mezzanine Loan	7,164		33,587		10,988		—		July 2020
Jr. Mortgage Participation/Mezzanine Loan	—		60,000		15,627		15,606		July 2021
Mezzanine Loan	—		280,000		34,124		—		August 2022
Mezzanine Loan(12)	—		—		—		15,369
Mortgage/ Mezzanine Loan(6)	—		—		—		32,847
Mortgage/Mezzanine Loan(6)	—		—		—		22,959
Mezzanine Loan(13)	—		—		—		14,957
Mortgage/Mezzanine Loan(14)	—		—		—		145,239
Total floating rate	$	181,320	$	3,498,215	$	1,243,925	$	1,232,178
Total	$	181,320	$	7,115,310	$	1,876,759	$	1,592,537

(1) Carrying value is net of discounts, premiums, original issue discounts and deferred origination fees.

(2) Represents contractual maturity, excluding any unexercised extension options.

(3) These loans were purchased at par in April and May 2017 and were in maturity default at the time of acquisition. At the time the loans were purchased, the Company expected to collect all contractually required payments, including interest. In August 2017, the Company determined that it was probable that the loans would not be repaid in full and therefore, the loans were put on non-accrual status. No impairment was recorded as the Company believes that the fair value of the property exceeds the carrying amount of the loans. The loans had an outstanding balance including accrued interest of $259.3 million at the time that they were put on non-accrual status.

(4) In September 2014, we acquired a $26.4 million mortgage loan at a $0.2 million discount and a $5.7 million junior mortgage participation at a $5.7 million discount. The junior mortgage participation was a nonperforming loan at acquisition, is currently on non-accrual status and has no carrying value.

(5) Carrying value is net of the following amounts that were sold or syndicated, which are included in other assets and other liabilities on the consolidated balance sheets as a result of the transfers not meeting the conditions for sale accounting: (a) $1.2 million, (b) $12.0 million, (c) $14.6 million, (d) $14.1 million, (e) $5.1 million, and (f) $21.2 million

(6) This loan was repaid in June 2017.

(7) This loan was repaid in March 2017.

(8) This loan was extended in October 2017.

(9) This loan was extended in January 2017.

(10) This loan was extended in September 2017.

(11) $66.1 million of outstanding principal was syndicated in February 2017.

(12) This loan was repaid in September 2017.

(13) This loan was contributed to a joint venture in May 2017.

(14) This loan was repaid in January 2017.

Summary of preferred equity investments

As of September 30, 2017 and December 31, 2016, we held the following preferred equity investments with an aggregate weighted average current yield of 6.98% at September 30, 2017 (in thousands):

Type	September 30, 2017 Future Funding Obligations		September 30, 2017 Senior Financing		September 30, 2017 Carrying Value (1)		December 31, 2016 Carrying Value (1)		Mandatory Redemption (2)
Preferred Equity(3)	$	—	$	272,000	$	143,980	$	—	April 2021
Preferred Equity(4)	—		—		—		9,982
Preferred Equity(5)	—		—		—		37,893
Total	$	—	$	272,000	$	143,980	$	47,875

(1) Carrying value is net of deferred origination fees.

(2) Represents contractual maturity, excluding any unexercised extension options.

(3) In February 2016, we closed on the sale of 885 Third Avenue and retained a preferred equity position in the property. The sale did not meet the criteria for sale accounting under the full accrual method in ASC 360-20, Property, Plant and Equipment - Real Estate Sales. As a result the property remained on our consolidated balance sheet until the criteria was met in April 2017 at which time the property was deconsolidated and the preferred equity investment was recognized.

(4) This investment was redeemed in May 2017.

(5) This investment was redeemed in April 2017.

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Investments in Unconsolidated Joint Ventures (Tables)

9 Months Ended

Sep. 30, 2017

Equity Method Investments and Joint Ventures [Abstract]

Schedule of general information on joint ventures

The following table summarizes the investments in unconsolidated joint ventures sold during the nine months ended September 30, 2017:

Property	Ownership Interest	Disposition Date	Type of Sale	Gross Asset Valuation (in thousands)(1)		Gain on Sale (in thousands)(2)
Stonehenge Portfolio (partial)	Various	March 2017	Ownership Interest	$	300,000	$	871
102 Greene Street	10.00%	September 2017	Ownership Interest	$	43,500	$	283

(1) Represents implied gross valuation for the joint venture or sales price of the property.

(2) Represents the Company's share of the gain.

The table below provides general information on each of our joint ventures as of September 30, 2017:

Property	Partner	Ownership Interest (1)	Economic Interest (1)	Unaudited Approximate Square Feet	Acquisition Date(2)	Acquisition Price(2) (in thousands)
100 Park Avenue	Prudential Real Estate Investors	49.90%	49.90%	834,000	February 2000	$	95,800
717 Fifth Avenue	Jeff Sutton/Private Investor	10.92%	10.92%	119,500	September 2006	251,900
800 Third Avenue	Private Investors	60.52%	60.52%	526,000	December 2006	285,000
1745 Broadway	Ivanhoe Cambridge, Inc.	56.87%	56.87%	674,000	April 2007	520,000
Jericho Plaza	Onyx Equities/Credit Suisse	11.67%	11.67%	640,000	April 2007	210,000
11 West 34th Street	Private Investor/ Jeff Sutton	30.00%	30.00%	17,150	December 2010	10,800
3 Columbus Circle(3)	The Moinian Group	48.90%	48.90%	741,500	January 2011	500,000
280 Park Avenue	Vornado Realty Trust	50.00%	50.00%	1,219,158	March 2011	400,000
1552-1560 Broadway(4)	Jeff Sutton	50.00%	50.00%	57,718	August 2011	136,550
724 Fifth Avenue	Jeff Sutton	50.00%	50.00%	65,010	January 2012	223,000
10 East 53rd Street	Canadian Pension Plan Investment Board	55.00%	55.00%	354,300	February 2012	252,500
521 Fifth Avenue	Plaza Global Real Estate Partners LP	50.50%	50.50%	460,000	November 2012	315,000
21 East 66th Street(5)	Private Investors	32.28%	32.28%	13,069	December 2012	75,000
650 Fifth Avenue(6)	Jeff Sutton	50.00%	50.00%	69,214	November 2013	—
121 Greene Street	Jeff Sutton	50.00%	50.00%	7,131	September 2014	27,400
175-225 Third Street Brooklyn, New York	KCLW 3rd Street LLC/LIVWRK LLC	95.00%	95.00%	—	October 2014	74,600
55 West 46th Street	Prudential Real Estate Investors	25.00%	25.00%	347,000	November 2014	295,000
Stonehenge Portfolio (7)	Various	Various	Various	1,439,016	February 2015	36,668
131-137 Spring Street	Invesco Real Estate	20.00%	20.00%	68,342	August 2015	277,750
605 West 42nd Street	The Moinian Group	20.00%	20.00%	927,358	April 2016	759,000
11 Madison Avenue	PGIM Real Estate	60.00%	60.00%	2,314,000	August 2016	2,605,000
333 East 22nd Street (8)	Private Investors	33.33%	33.33%	26,926	August 2016	—
400 E 57th Street (9)	BlackRock, Inc and Stonehenge Partners	51.00%	41.00%	290,482	October 2016	170,000
One Vanderbilt (10)	National Pension Service of Korea/Hines Interest LP	71.01%	71.01%	—	January 2017	3,310,000
Mezzanine Loan (11)	Private Investors	33.33%	33.33%	—	May 2017	15,000

(1) Ownership interest and economic interest represent the Company's interests in the joint venture as of September 30, 2017. Changes in ownership or economic interests, if any, within the current year are disclosed in the notes below.

(2) Acquisition date and price represent the date on which the Company initially acquired an interest in the joint venture and the actual or implied gross purchase price for the joint venture on that date. Acquisition date and price are not adjusted for subsequent acquisitions or dispositions of interest.

(3) As a result of the sale of a condominium interest in September 2012, Young & Rubicam, Inc., or Y&R, owns floors three through eight at the property. Because the joint venture has an option to repurchase these floors, the gain associated with this sale was deferred.

(4) The purchase price represents only the purchase of the 1552 Broadway interest which comprised approximately 13,045 square feet. The joint venture also owns a long-term leasehold interest in the retail space and certain other spaces at 1560 Broadway, which is adjacent to 1552 Broadway.

(5) We hold a 32.28% interest in three retail and two residential units at the property and a 16.14% interest in three residential units at the property.

(6) The joint venture owns a long-term leasehold interest in the retail space at 650 Fifth Avenue. In connection with the ground lease obligation, SLG provided a performance guaranty and our joint venture partner executed a contribution agreement to reflect its pro rata obligation. In the event the property is converted into a condominium unit and the landlord elects the purchase option, the joint venture shall be obligated to acquire the unit at the then fair value.

(7) In March 2017, the Company sold a partial interest in the Stonehenge Portfolio as further described under Sale of Joint Venture Interest or Properties below.

(8) The joint venture acquired a leasehold interest in the property in October 2016.

(9) In October 2016, the Company sold a 49% interest in this property to an investment account managed by BlackRock, Inc. The Company's interest in the property was sold within a consolidated joint venture owned 90% by the Company and 10% by Stonehenge. The transaction resulted in the deconsolidation of the venture's remaining 51% interest in the property. The Company's joint venture with Stonehenge remains consolidated resulting in the combined 51% interest being shown within investments in unconsolidated joint ventures on the Company's balance sheet.

(10) In January 2017, the Company admitted two partners, National Pension Service of Korea and Hines Interest LP, into the One Vanderbilt Avenue development project. In April 2017, the criteria for deconsolidation were met, and the development is shown within investments in unconsolidated joint ventures. The partners have committed aggregate equity to the project totaling no less than $525 million and their ownership interest in the joint venture is based on their capital contributions, up to an aggregate maximum of 29.0%. At September 30, 2017 the total of the two partners' ownership interests based on equity contributed was 3.49%.

(11) In May 2017, the Company contributed a mezzanine loan secured by a commercial property in midtown Manhattan to a joint venture and retained a 33.33% interest in the venture. The carrying value is net of $10.0 million that was sold, which is included in other assets and other liabilities on the consolidated balance sheets as a result of the transfers not meeting the conditions for sale accounting. In October 2017, the initial maturity date of November 2017 was extended to November 2018.

As of September 30, 2017 and December 31, 2016, the carrying value for acquisition, development and construction arrangements were as follows (in thousands):

Loan Type	September 30, 2017		December 31, 2016		Maturity Date
Mezzanine Loan and Preferred Equity(1)	$	100,000	$	100,000	March 2018
Mezzanine Loan(2)	44,881		45,622		February 2022
Mezzanine Loan(3)	25,854		24,542		July 2036
	$	170,735	$	170,164

(1) These loans were extended in February 2017.

(2) We have an option to convert our loan to an equity interest subject to certain conditions. We have determined that our option to convert the loan to equity is not a derivative financial instrument pursuant to GAAP.

(3) The Company has the ability to convert this loan into an equity position starting in 2021 and the borrower is able to force this conversion in 2024.

Schedule of first mortgage notes payable collateralized by the respective joint venture properties and assignment of leases

The first mortgage notes and other loans payable collateralized by the respective joint venture properties and assignment of leases at September 30, 2017 and December 31, 2016, respectively, are as follows (amounts in thousands):

Property	Economic Interest (1)		Maturity Date	Interest Rate (2)		September 30, 2017		December 31, 2016
Fixed Rate Debt:
521 Fifth Avenue	50.50	%	November 2019	3.73	%	$	170,000	$	170,000
717 Fifth Avenue (3)	10.92	%	July 2022	4.45	%	300,000		300,000

Property	Economic Interest (1)		Maturity Date	Interest Rate (2)		September 30, 2017			December 31, 2016
717 Fifth Avenue (3)	10.92	%	July 2022	5.50	%	355,328			355,328
650 Fifth Avenue	50.00	%	October 2022	4.95	%	225,000			—
21 East 66th Street	32.28	%	April 2023	3.60	%	12,000			12,000
3 Columbus Circle	48.90	%	March 2025	3.61	%	350,000			350,000
11 Madison Avenue	60.00	%	September 2025	3.84	%	1,400,000			1,400,000
800 Third Avenue	60.52	%	February 2026	3.37	%	177,000			177,000
400 East 57th Street	41.00	%	November 2026	3.00	%	100,000			100,000
Stonehenge Portfolio (4)	Various		Various	4.17	%	359,095			362,518
1745 Broadway (5)						—			340,000
Total fixed rate debt						$	3,448,423		$	3,566,846
Floating Rate Debt:
55 West 46th Street (6)	25.00	%	October 2017	3.52	%	$	165,328		$	157,322
175-225 Third Street Brooklyn, New York	95.00	%	December 2017	5.25	%	40,000			40,000
Jericho Plaza (7)	11.67	%	March 2018	5.37	%	79,530			76,993
724 Fifth Avenue	50.00	%	April 2018	3.64	%	275,000			275,000
1552 Broadway (8)	50.00	%	April 2018	5.41	%	185,410			185,410
280 Park Avenue (9)	50.00	%	September 2019	3.09	%	1,200,000			900,000
121 Greene Street	50.00	%	November 2019	2.72	%	15,000			15,000
1745 Broadway (10)	56.87	%	January 2020	3.07	%	345,000			—
10 East 53rd Street	55.00	%	February 2020	3.47	%	170,000			125,000
131-137 Spring Street	20.00	%	August 2020	2.77	%	141,000			141,000
11 West 34th Street	30.00	%	January 2021	2.68	%	23,000			23,000
100 Park Avenue	49.90	%	February 2021	2.97	%	360,000			360,000
One Vanderbilt (11)	71.01	%	September 2021	4.72	%	271,229			—
605 West 42nd Street (12)	20.00	%	August 2027	2.84	%	550,000			539,000
21 East 66th Street	32.28	%	June 2033	3.62	%	1,667			1,726
Stonehenge Portfolio	Various		April 2018	2.47	%	55,340			65,577
650 Fifth Avenue (13)						—			77,500
Total floating rate debt						$	3,877,504		$	2,982,528
Total joint venture mortgages and other loans payable						$	7,325,927		$	6,549,374
Deferred financing costs, net						(127,318		)	(95,408		)
Total joint venture mortgages and other loans payable, net						$	7,198,609		$	6,453,966

(1) Economic interest represent the Company's interests in the joint venture as of September 30, 2017. Changes in ownership or economic interests, if any, within the current year are disclosed in the notes to the investment in unconsolidated joint ventures note above.

(2) Effective weighted average interest rate for the three months ended September 30, 2017, taking into account interest rate hedges in effect during the period.

(3) These loans are comprised of a $300.0 million fixed rate mortgage loan and $355.3 million mezzanine loan. The mezzanine loan is subject to accretion based on the difference between contractual interest rate and contractual pay rate.

(4) Amount is comprised of $34.0 million, $137.7 million, $172.5 million, and $14.9 million in fixed-rate mortgages that mature in November 2017, August 2019, June 2024, and February 2027, respectively.

(5) In January 2017, this loan was refinanced with a floating rate loan as shown above.

(6) This loan has a committed amount of $190.0 million, of which $24.7 million was unfunded as of September 30, 2017. In October 2017, this loan was refinanced with a new $195.0 million mortgage loan with a floating interest rate of 213 basis points over 30-day LIBOR and a maturity date of November 2020.

(7) The property secures a two year $100.0 million loan, of which $79.5 million is currently outstanding.

(8) These loans are comprised of a $145.0 million mortgage loan and a $41.5 million mezzanine loan. As of September 30, 2017, $0.6 million of the mortgage loan and $0.5 million of the mezzanine loan were unfunded. In October 2017, this loan was refinanced with a new $195.0 million mortgage loan with a floating interest rate of 265 basis points over 30-day LIBOR and a maturity date of October 2020.

(9) In August 2017, this loan was refinanced with a new $1.075 billion mortgage loan and a new $125.0 million mezzanine loan, which carry floating interest rates of 148 basis points over 30-day LIBOR and 385 basis points over 30-day LIBOR, respectively. Both the mortgage loan and mezzanine loan initially mature in September 2019.

(10) This loan has a committed amount of $375.0 million, of which $30.0 million was unfunded as of September 30, 2017.

(11) This loan is a $1.5 billion construction facility in connection with the development of One Vanderbilt. This facility bears interest at 350 basis points over 30-day LIBOR, with reduction based on meeting certain conditions, and has an initial five-year term with twoone-year extension options. Advances under the loan are subject to incurred costs, funded equity, loan to value thresholds, and entering into construction contracts.

(12) In August 2017, this loan was refinanced with a new $550.0 million mortgage note, with a floating interest rate of 144 basis points over 30-day LIBOR and a maturity date of August 2027.

(13) In September 2017, this loan was refinanced with a fixed rate loan as shown above.

Schedule of combined balance sheets for the unconsolidated joint ventures

The combined balance sheets for the unconsolidated joint ventures, at September 30, 2017 and December 31, 2016 are as follows (in thousands):

	September 30, 2017		December 31, 2016
Assets
Commercial real estate property, net	$	9,944,280	$	9,131,717
Cash and restricted cash	370,596		328,455
Tenant and other receivables, related party receivables, and deferred rents receivable, net of allowance	267,244		232,778
Debt and preferred equity investments, net	201,731		336,164
Other assets	636,365		683,481
Total assets	$	11,420,216	$	10,712,595
Liabilities and members' equity
Mortgages and other loans payable, net	$	7,198,609	$	6,453,966
Deferred revenue/gain	340,310		356,414
Other liabilities	411,261		391,500
Members' equity	3,470,036		3,510,715
Total liabilities and members' equity	$	11,420,216	$	10,712,595
Company's investments in unconsolidated joint ventures	$	2,045,796	$	1,890,186

Schedule of combined statements of income for the unconsolidated joint ventures

The combined statements of operations for the unconsolidated joint ventures, for the three and nine months ended September 30, 2017 and 2016, are as follows (in thousands):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Total revenues	$	216,100		$	184,221		$	643,210		$	498,308
Operating expenses	38,055			34,727			115,996			89,147
Ground rent	4,182			3,744			12,612			10,670
Real estate taxes	37,282			30,814			107,391			79,356
Interest expense, net of interest income	61,066			51,789			176,096			147,876
Amortization of deferred financing costs	4,030			7,155			17,994			17,667
Transaction related costs	—			5,359			146			5,359
Depreciation and amortization	61,447			56,890			198,556			132,035
Total expenses	206,062			190,478			628,791			482,110
Loss on early extinguishment of debt	(7,638		)	—			(7,638		)	(1,606		)
Net income (loss) before gain on sale	$	2,400		$	(6,257	)	$	6,781		$	14,592
Company's equity in net income (loss) from unconsolidated joint ventures	$	4,078		$	(3,968	)	$	14,104		$	11,969

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Deferred Costs (Tables)

9 Months Ended

Sep. 30, 2017

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Schedule of components of deferred costs

Deferred costs at September 30, 2017 and December 31, 2016 consisted of the following (in thousands):

	September 30, 2017			December 31, 2016
Deferred leasing costs	$	464,788		$	468,971
Less: accumulated amortization	(216,807		)	(201,371		)
Deferred costs, net	$	247,981		$	267,600

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Mortgages and Other Loans Payable (Tables)

9 Months Ended

Sep. 30, 2017

Mortgages and Other Loans Payable

Schedule of first mortgages and other loans payable collateralized by the respective properties and assignment of leases

The first mortgages and other loans payable collateralized by the respective properties and assignment of leases or debt investments at September 30, 2017 and December 31, 2016, respectively, were as follows (amounts in thousands):

Property	Maturity Date	Interest Rate (1)		September 30, 2017			December 31, 2016
Fixed Rate Debt:
Unsecured Loan	June 2018	4.81	%	$	16,000		$	16,000
One Madison Avenue	May 2020	5.91	%	494,264			517,806
762 Madison Avenue	February 2022	5.00	%	771			7,694
100 Church Street	July 2022	4.68	%	218,237			221,446
919 Third Avenue (2)	June 2023	5.12	%	500,000			500,000
420 Lexington Avenue	October 2024	3.99	%	300,000			300,000
1515 Broadway	March 2025	3.93	%	876,613			888,531
400 East 58th Street (3)	November 2026	3.00	%	40,000			40,000
Landmark Square	January 2027	4.90	%	100,000			100,000
485 Lexington Avenue	February 2027	4.25	%	450,000			450,000
1080 Amsterdam (4)	February 2027	3.58	%	36,363			—
315 West 33rd Street	February 2027	4.17	%	250,000			—
Series J Preferred Units (5)	April 2051	3.75	%	4,000			4,000
885 Third Avenue (6)				—			267,650
FHLBNY Facility (7)				—			105,000
FHLBNY Facility (7)				—			100,000
Total fixed rate debt				$	3,286,248		$	3,518,127
Floating Rate Debt:
719 Seventh Avenue	February 2018	4.27	%	$	41,171		$	37,388
183, 187 Broadway & 5-7 Dey Street	May 2018	3.92	%	58,000			58,000
2016 Master Repurchase Agreement	July 2018	3.73	%	184,642			184,642
220 East 42nd Street	October 2020	2.82	%	275,000			275,000
One Vanderbilt Avenue (8)				—			64,030
1080 Amsterdam (9)				—			3,525
Total floating rate debt				$	558,813		$	622,585
Total fixed rate and floating rate debt				$	3,845,061		$	4,140,712
Mortgages reclassed to liabilities related to assets held for sale				—			—
Total mortgages and other loans payable				$	3,845,061		$	4,140,712
Deferred financing costs, net of amortization				(40,887		)	(66,882		)
Total mortgages and other loans payable, net				$	3,804,174		$	4,073,830

(1) Effective weighted average interest rate for the quarter ended September 30, 2017, taking into account interest rate hedges in effect during the period.

(2) We own a 51.0% controlling interest in the consolidated joint venture that is the borrower on this loan.

(3) The loan carries a fixed interest rate of 3.00% for the first 5 years and is prepayable without penalty in year 5.

(4) The loan is comprised of a $35.5 million mortgage loan and $0.9 million subordinate loan with a fixed interest rate of 3.50% and 7.00%, respectively, for the first 5 years and is prepayable without penalty in year 5.

(5) In connection with the acquisition of a commercial real estate property, the Operating Partnership issued $4.0 million, 3.75% Series J Preferred Units of limited partnership interest, or the Series J Preferred Units, with a mandatory liquidation preference of $1,000 per unit. The Series J Preferred Units are accounted for as debt because they can be redeemed in cash by the Operating Partnership on the earlier of (i) the date of the sale of the property or (ii) April 30, 2051 or at the option of the unitholders as provided for in the related agreement.

(6) In February 2016, we closed on the sale of 885 Third Avenue. The sale did not meet the criteria for sale accounting at that time. In April 2017, the mortgage was refinanced by the buyer, resulting in the Company deconsolidating the property from its financial statements in the second quarter of 2017.

(7) The facility was repaid in January 2017.

(8) In September 2016, we closed on a $1.5 billion construction facility in connection with the development of One Vanderbilt Avenue. In January 2017, we admitted two partners, National Pension Service of Korea and Hines Interest LP, into the One Vanderbilt Avenue development project. In April 2017, the criteria for deconsolidation were met, and the development is shown within investments in unconsolidated joint ventures. See Note 6, "Investments in Unconsolidated Joint Ventures".

(9) In January 2017, this loan was refinanced with a fixed rate loan as shown above.

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Corporate Indebtedness (Tables)

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Schedule of senior unsecured notes and other related disclosures by scheduled maturity date

The following table sets forth our senior unsecured notes and other related disclosures as of September 30, 2017 and December 31, 2016, respectively, by scheduled maturity date (dollars in thousands):

Issuance	September 30, 2017 Unpaid Principal Balance		September 30, 2017 Accreted Balance			December 31, 2016 Accreted Balance			Coupon Rate (1)		Effective Rate		Initial Term (in Years)	Maturity Date
October 12, 2010 (2)	$	269,000	$	268,628		$	334,077		3.00	%	3.00	%	7	October 2017
August 5, 2011 (3)	250,000		249,934			249,880			5.00	%	5.00	%	7	August 2018
March 16, 2010 (3)	250,000		250,000			250,000			7.75	%	7.75	%	10	March 2020
November 15, 2012 (3)	200,000		200,000			200,000			4.50	%	4.50	%	10	December 2022
December 17, 2015 (3)	100,000		100,000			100,000			4.27	%	4.27	%	10	December 2025
	$	1,069,000	$	1,068,562		$	1,133,957
Deferred financing costs, net			(4,018		)	(5,642		)
	$	1,069,000	$	1,064,544		$	1,128,315

(1) Interest on the senior unsecured notes is payable semi-annually with principal and unpaid interest due on the scheduled maturity dates.

(2) Issued by the Operating Partnership. The notes were senior unsecured obligations of the Operating Partnership and exchangeable at a calculated exchange rate upon the occurrence of specified events and during the period beginning on the twenty-second scheduled trading day prior to the maturity date and ending on the second business day prior to the maturity date, into cash, or a combination of cash and shares of SL Green's common stock, if any, at our option. In accordance with the terms of the indenture, the notes became exchangeable commencing September 14, 2017 and the Operating Partnership elected to settle exchanges in cash. In October 2017, all note holders elected to exchange the notes and the notes were repaid for $350.8 million, excluding accrued interest based on the applicable exchange rate.

(3) Issued by the Company, the Operating Partnership and ROP, as co-obligors. In October 2017, the Company, the Operating Partnership and ROP, as co-obligors issued an additional $100.0 million of the 4.50% senior unsecured bonds due December 2022. The additional notes priced at 105.334% plus accrued interest from June 1, 2017, with a yield to maturity of 3.298%.

Schedule of combined aggregate principal maturities

Combined aggregate principal maturities of mortgages and other loans payable, 2012 credit facility, trust preferred securities, senior unsecured notes and our share of joint venture debt as of September 30, 2017, including as-of-right extension options and put options, were as follows (in thousands):

	Scheduled Amortization		Principal		Revolving Credit Facility		Unsecured Term Loan		Trust Preferred Securities		Senior Unsecured Notes			Total		Joint Venture Debt
Remaining 2017	$	12,846	$	—	$	—	$	—	$	—	$	269,000	(1)	$	281,846	$	79,787
2018	54,937		299,813		—		—		—		250,000			604,750		242,799
2019	59,618		—		—		1,183,000		—		—			1,242,618		705,574
2020	41,427		679,531		280,000		—		—		250,000			1,250,958		320,914
2021	30,418		—		—		—		—		—			30,418		376,765
Thereafter	90,532		2,575,939		—		—		100,000		300,000			3,066,471		1,465,371
	$	289,778	$	3,555,283	$	280,000	$	1,183,000	$	100,000	$	1,069,000		$	6,477,061	$	3,191,210

Schedule of consolidated interest expense, excluding capitalized interest

Consolidated interest expense, excluding capitalized interest, was comprised of the following (in thousands):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Interest expense before capitalized interest	$	72,859		$	78,715		$	217,273		$	276,437
Interest capitalized	(6,869		)	(6,084		)	(19,892		)	(18,135		)
Interest income	(356		)	(66		)	(1,269		)	(1,976		)
Interest expense, net	$	65,634		$	72,565		$	196,112		$	256,326

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Related Party Transactions (Tables)

9 Months Ended

Sep. 30, 2017

Related Party Transactions [Abstract]

Schedule of amounts due from/to related parties

Amounts due from joint ventures and related parties at September 30, 2017 and December 31, 2016 consisted of the following (in thousands):

	September 30, 2017		December 31, 2016
Due from joint ventures	$	16,736	$	1,240
Other	7,332		14,616
Related party receivables	$	24,068	$	15,856

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Noncontrolling Interests on the Company's Consolidated Financial Statements (Tables)

9 Months Ended

Sep. 30, 2017

Noncontrolling Interest [Abstract]

Schedule of Noncontrolling Interest

Below is the rollforward analysis of the activity relating to the noncontrolling interests in the Operating Partnership as of September 30, 2017 and December 31, 2016 (in thousands):

	September 30, 2017			December 31, 2016
Balance at beginning of period	$	473,882		$	424,206
Distributions	(10,639		)	(12,671		)
Issuance of common units	23,273			78,495
Redemption of common units	(15,353		)	(31,805		)
Net income	2,707			10,136
Accumulated other comprehensive income allocation	(303		)	1,299
Fair value adjustment	(2,669		)	4,222
Balance at end of period	$	470,898		$	473,882

Schedule of Preferred Unit Activity

Below is the rollforward analysis of the activity relating to the preferred units in the Operating Partnership as of September 30, 2017 and December 31, 2016 (in thousands):

	September 30, 2017			December 31, 2016
Balance at beginning of period	$	302,010		$	282,516
Issuance of preferred units	—			22,793
Redemption of preferred units	(125		)	(3,299		)
Balance at end of period	$	301,885		$	302,010

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Stockholders' Equity of the Company (Tables)

9 Months Ended

Sep. 30, 2017

Stockholders' Equity Note [Abstract]

Class of Treasury Stock

In August 2016, our board of directors approved a stock repurchase plan under which we can buy up to $1.0 billion of shares of our common stock. At September 30, 2017, repurchases made under the stock repurchase plans were as follows:

Period	Total number of shares purchased	Average price paid per share	Total number of shares purchased as part of the repurchase plan or programs	Maximum approximate dollar value of shares that may yet be purchased under the plan (in millions)
First quarter 2017	982	$103.89	982	$999.9
Second quarter 2017	2,447,153	$103.41	2,448,135	$746.8
Third quarter 2017	951,866	$101.67	3,400,001	$650.0

Schedule of Earnings Per Share

SL Green's earnings per share for the three and nine months ended September 30, 2017 and 2016 are computed as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
Numerator	2017		2016		2017		2016
Basic Earnings:
Income attributable to SL Green common stockholders	$	38,869	$	34,252	$	58,442	$	190,930
Effect of Dilutive Securities:
Redemption of units to common shares	1,812		1,663		2,707		8,171
Diluted Earnings:
Income attributable to SL Green common stockholders	$	40,681	$	35,915	$	61,149	$	199,101

	Three Months Ended September 30,		Nine Months Ended September 30,
Denominator	2017	2016	2017	2016
Basic Shares:
Weighted average common stock outstanding	97,783	100,233	99,431	100,140
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares	4,543	4,497	4,570	4,272
Stock-based compensation plans	244	413	279	349
Diluted weighted average common stock outstanding	102,570	105,143	104,280	104,761

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Partners' Capital of the Operating Partnership (Tables)

9 Months Ended

Sep. 30, 2017

Equity [Abstract]

Schedule of calculation of numerator and denominator in earnings per unit

The Operating Partnership's earnings per unit for the three and nine months ended September 30, 2017 and 2016, respectively are computed as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
Numerator	2017		2016		2017		2016
Basic and Diluted Earnings:
Net income attributable to SLGOP common unitholders	$	40,681	$	35,915	$	61,149	$	199,101

	Three Months Ended September 30,		Nine Months Ended September 30,
Denominator	2017	2016	2017	2016
Basic units:
Weighted average common units outstanding	102,326	104,730	104,001	104,412
Effect of Dilutive Securities:
Stock-based compensation plans	244	413	279	349
Diluted weighted average common units outstanding	102,570	105,143	104,280	104,761

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Share-based Compensation (Tables)

9 Months Ended

Sep. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of weighted average assumptions used to estimate the grant date fair value of options granted

The fair value of each stock option or LTIP Unit granted is estimated on the date of grant using the Black-Scholes option pricing model based on historical information with the following weighted average assumptions for grants during the nine months ended September 30, 2017 and the year ended December 31, 2016.

	September 30, 2017		December 31, 2016
Dividend yield	2.50	%	2.37	%
Expected life	4.4 years		3.7 years
Risk-free interest rate	1.73	%	1.57	%
Expected stock price volatility	28.21	%	26.76	%

Summary of the status of stock options and changes during the period

A summary of the status of the Company's stock options as of September 30, 2017 and December 31, 2016, and changes during the nine months ended September 30, 2017 and year ended December 31, 2016 are as follows:

	September 30, 2017					December 31, 2016
	Options Outstanding			Weighted Average Exercise Price		Options Outstanding			Weighted Average Exercise Price
Balance at beginning of period	$	1,737,213		$	98.44	$	1,595,007		$	95.52
Granted	171,000			105.70		445,100			105.86
Exercised	(146,277		)	84.02		(192,875		)	76.90
Lapsed or cancelled	(65,300		)	122.30		(110,019		)	123.86
Balance at end of period	$	1,696,636		$	99.50	$	1,737,213		$	98.44
Options exercisable at end of period	939,485			$	91.71	748,617			$	87.72
Weighted average fair value of options granted during the period	$	3,775,639				$	8,363,036

Summary of restricted stock and charges during the period

A summary of the Company's restricted stock as of September 30, 2017 and December 31, 2016 and charges during the nine months ended September 30, 2017 and the year ended December 31, 2016, are as follows:

	September 30, 2017		December 31, 2016
Balance at beginning of period	3,202,031		3,137,881
Granted	300		98,800
Cancelled	—		(34,650		)
Balance at end of period	3,202,331		3,202,031
Vested during the period	86,736		83,822
Compensation expense recorded	$	7,277,054	$	7,153,966
Weighted average fair value of restricted stock granted during the period	$	30,813	$	10,650,077

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Accumulated Other Comprehensive Income (Tables)

9 Months Ended

Sep. 30, 2017

SL Green Realty Corp

Accumulated Other Comprehensive Income (Loss) [Line Items]

Schedule of accumulated other comprehensive income (loss)

The following tables set forth the changes in accumulated other comprehensive income (loss) by component as of September 30, 2017 (in thousands):

	Net unrealized gain on derivative instruments (1)			SL Green’s share of joint venture net unrealized gain on derivative instruments (2)			Net unrealized gain on marketable securities			Total
Balance at December 31, 2016	$	12,596		$	4,021		$	5,520		$	22,137
Other comprehensive (loss) before reclassifications	(4,669		)	(947		)	(1,133		)	(6,749		)
Amounts reclassified from accumulated other comprehensive income	1,336			591			(3,130		)	(1,203		)
Balance at September 30, 2017	$	9,263		$	3,665		$	1,257		$	14,185

(1) Amount reclassified from accumulated other comprehensive income (loss) is included in interest expense in the respective consolidated statements of operations. As of September 30, 2017 and December 31, 2016, the deferred net losses from these terminated hedges, which is included in accumulated other comprehensive loss relating to net unrealized loss on derivative instrument, was $3.7 million and $7.1 million, respectively.

(2) Amount reclassified from accumulated other comprehensive income (loss) is included in equity in net income from unconsolidated joint ventures in the respective consolidated statements of operations.

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Fair value measurements, recurring and nonrecurring

The following tables set forth the assets and liabilities that we measure at fair value on a recurring and non-recurring basis by their levels in the fair value hierarchy at September 30, 2017 and December 31, 2016 (in thousands):

	September 30, 2017
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities	$	28,802	$	—	$	28,802	$	—
Interest rate cap and swap agreements (included in other assets)	$	13,727	$	—	$	13,727	$	—

	December 31, 2016
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities	$	85,110	$	48,315	$	36,795	$	—
Interest rate cap and swap agreements (included in other assets)	$	21,090	$	—	$	21,090	$	—
Liabilities:
Interest rate cap and swap agreements (included in accrued interest payable and other liabilities)	$	1	$	—	$	1	$	—

Fair value, by balance sheet grouping

The following table provides the carrying value and fair value of these financial instruments as of September 30, 2017 and December 31, 2016 (in thousands):

	September 30, 2017				December 31, 2016
	Carrying Value (1)		Fair Value		Carrying Value (1)		Fair Value
Debt and preferred equity investments	$	2,020,739	(2)		$	1,640,412	(2)
Fixed rate debt	$	5,154,810	$	5,398,870	$	5,452,084	$	5,722,494
Variable rate debt	1,321,813		1,314,223		1,105,585		1,110,110
	$	6,476,623	$	6,713,093	$	6,557,669	$	6,832,604

(1) Amounts exclude net deferred financing costs.

(2) At September 30, 2017, debt and preferred equity investments had an estimated fair value ranging between $2.0 billion and $2.2 billion. At December 31, 2016, debt and preferred equity investments had an estimated fair value ranging between $1.6 billion and $1.8 billion.

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Financial Instruments: Derivatives and Hedging (Tables)

9 Months Ended

Sep. 30, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of notional and fair value of derivative financial instruments and foreign currency hedges

The following table summarizes the notional value at inception and fair value of our consolidated derivative financial instruments at September 30, 2017 based on Level 2 information. The notional value is an indication of the extent of our involvement in these instruments at that time, but does not represent exposure to credit, interest rate or market risks (amounts in thousands).

	Notional Value		Strike Rate		Effective Date	Expiration Date	Balance Sheet Location	Fair Value
Interest Rate Swap	$	200,000	0.938	%	October 2014	December 2017	Other Assets	$	105
Interest Rate Swap	150,000		0.940	%	October 2014	December 2017	Other Assets	78
Interest Rate Swap	150,000		0.940	%	October 2014	December 2017	Other Assets	78
Interest Rate Cap	137,500		4.000	%	September 2017	September 2019	Other Assets	4
Interest Rate Swap	200,000		1.131	%	July 2016	July 2023	Other Assets	8,998
Interest Rate Swap	100,000		1.161	%	July 2016	July 2023	Other Assets	4,335
Interest Rate Swap	100,000		2.287	%	November 2017	November 2027	Other Assets	129
								$	13,727

Schedule of effect of derivative financial instruments on consolidated statements of income

The following table presents the effect of our derivative financial instruments and our share of our joint ventures' derivative financial instruments that are designated and qualify as hedging instruments on the consolidated statements of operations for the three months ended September 30, 2017 and 2016, respectively (in thousands):

	Amount of (Loss) Recognized in Other Comprehensive Loss (Effective Portion)						Location of (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income	Amount of Loss  Reclassified from Accumulated Other Comprehensive Loss  into Income (Effective Portion)				Location of (Loss) Recognized in Income on Derivative	Amount of (Loss) Gain Recognized into Income (Ineffective Portion)
	Three Months Ended September 30,							Three Months Ended September 30,					Three Months Ended September 30,
Derivative	2017			2016				2017		2016			2017			2016
Interest Rate Swaps/Caps	$	(304	)	$	(7	)	Interest expense	$	85	$	1,442	Interest expense	$	4		$	—
Share of unconsolidated joint ventures' derivative instruments	(290		)	(222		)	Equity in net income from unconsolidated joint ventures	185		547		Equity in net income from unconsolidated joint ventures	(48		)	830
	$	(594	)	$	(229	)		$	270	$	1,989		$	(44	)	$	830

The following table presents the effect of our derivative financial instruments and our share of our joint ventures' derivative financial instruments that are designated and qualify as hedging instruments on the consolidated statements of operations for the nine months ended September 30, 2017 and 2016, respectively (in thousands):

	Amount of (Loss) Recognized in Other Comprehensive Loss (Effective Portion)						Location of (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income	Amount of Loss  Reclassified from Accumulated Other Comprehensive Loss  into Income (Effective Portion)				Location of (Loss) Recognized in Income on Derivative	Amount of (Loss) Recognized into Income (Ineffective Portion)
	Nine Months Ended September 30,							Nine Months Ended September 30,					Nine Months Ended September 30,
Derivative	2017			2016				2017		2016			2017			2016
Interest Rate Swaps/Caps	$	(5,477	)	$	(8,112	)	Interest expense	$	1,583	$	8,073	Interest expense	$	(4	)	$	(38	)
Share of unconsolidated joint ventures' derivative instruments	(1,277		)	(5,992		)	Equity in net income from unconsolidated joint ventures	876		1,465		Equity in net income from unconsolidated joint ventures	(109		)	(206		)
	$	(6,754	)	$	(14,104	)		$	2,459	$	9,538		$	(113	)	$	(244	)

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Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of future minimum rental payments for operating leases

The following is a schedule of future minimum lease payments under capital leases and non-cancellable operating leases with initial terms in excess of one year as of September 30, 2017 (in thousands):

	Capital lease			Non-cancellable operating leases
Remaining 2017	$	597		$	7,763
2018	2,387			31,049
2019	2,411			31,066
2020	2,620			31,436
2021	2,794			31,628
Thereafter	822,688			732,724
Total minimum lease payments	$	833,497		$	865,666
Amount representing interest	(790,837		)
Capital lease obligations	$	42,660

Schedule of future minimum rental payments for capital leases

The following is a schedule of future minimum lease payments under capital leases and non-cancellable operating leases with initial terms in excess of one year as of September 30, 2017 (in thousands):

	Capital lease			Non-cancellable operating leases
Remaining 2017	$	597		$	7,763
2018	2,387			31,049
2019	2,411			31,066
2020	2,620			31,436
2021	2,794			31,628
Thereafter	822,688			732,724
Total minimum lease payments	$	833,497		$	865,666
Amount representing interest	(790,837		)
Capital lease obligations	$	42,660

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Segment Information (Tables)

9 Months Ended

Sep. 30, 2017

Segment Reporting [Abstract]

Schedule of selected results of operations and selected asset information

Selected consolidated results of operations for the three and nine months ended September 30, 2017 and 2016, and selected asset information as of September 30, 2017 and December 31, 2016, regarding our operating segments are as follows (in thousands):

	Real Estate Segment			Debt and Preferred Equity Segment		Total Company
Total revenues
Three months ended:
September 30, 2017	$	326,780		$	47,820	$	374,600
September 30, 2016	341,285			75,396		416,681
Nine months ended:
September 30, 2017	1,001,390			148,741		1,150,131
September 30, 2016	1,315,392			174,347		1,489,739
Net income (loss) before 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, and gain on sale of investment in marketable securities
Three months ended:
September 30, 2017	$	4,873		$	39,892	$	44,765
September 30, 2016	(32,731		)	75,452		42,721
Nine months ended:
September 30, 2017	(504		)	132,402		131,898
September 30, 2016	(187,222		)	168,295		(18,927		)
Total assets
As of:
September 30, 2017	$	12,939,363		$	2,170,507	$	15,109,870
December 31, 2016	13,868,672			1,989,115		15,857,787

Schedule of reconciliation of income from continuing operations to net income attributable to SL Green common stockholders

The table below reconciles income from continuing operations to net income for the three and nine months ended September 30, 2017 and 2016 (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017			2016
Net income (loss) before 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, and gain on sale of investment in marketable securities	$	44,765	$	42,721	$	131,898		$	(18,927	)
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	—		397		(3,256		)	210,750
Depreciable real estate reserves	—		—		(85,336		)	(10,387		)
Gain (loss) on sale of investment in marketable securities	—		—		3,262			(83		)
Net income	$	45,795	$	43,343	$	62,734		$	224,941

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Organization and Basis of Presentation - Additional Information (Details) - SL Green Operating Partnership	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Organization
Percentage of ownership in SL Green Management LLC owned by operating partnership (percent)	100.00%
Noncontrolling interest in the operating partnership (as a percent)	4.45%	4.16%

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Organization and Basis of Presentation - Schedule of Commercial Office Properties (Details) $ in Billions	9 Months Ended
	Sep. 30, 2017 USD ($) ft² building shares
Real estate properties
Number of Properties | building	99
Approximate Square Feet unaudited (sqft)	31,800,088
Weighted Average Occupancy unaudited (as a percent)	90.40%
Debt and preferred equity investments including investments held by unconsolidated joint ventures | $	$ 2.2
Debt and preferred equity investments and other financing receivables included in other balance sheet items | $	$ 0.1
Number of shares to be received on redemption of one unit of limited partnership interests (shares) | shares	1
Commercial properties
Real estate properties
Number of Properties | building	84
Approximate Square Feet unaudited (sqft)	28,671,127
Weighted Average Occupancy unaudited (as a percent)	90.80%
Residential
Real estate properties
Number of Properties | building	15
Approximate Square Feet unaudited (sqft)	3,128,961
Weighted Average Occupancy unaudited (as a percent)	86.40%
Managed office properties
Real estate properties
Approximate Square Feet unaudited (sqft)	336,000
Consolidated properties
Real estate properties
Number of Properties | building	63
Approximate Square Feet unaudited (sqft)	20,826,609
Consolidated properties | Commercial properties
Real estate properties
Number of Properties | building	60
Approximate Square Feet unaudited (sqft)	20,354,504
Consolidated properties | Residential
Real estate properties
Number of Properties | building	3
Approximate Square Feet unaudited (sqft)	472,105
Unconsolidated properties
Real estate properties
Number of Properties | building	36
Approximate Square Feet unaudited (sqft)	10,973,479
Unconsolidated properties | Commercial properties
Real estate properties
Number of Properties | building	24
Approximate Square Feet unaudited (sqft)	8,316,623
Unconsolidated properties | Residential
Real estate properties
Number of Properties | building	12
Approximate Square Feet unaudited (sqft)	2,656,856
Manhattan
Real estate properties
Number of Properties | building	57
Approximate Square Feet unaudited (sqft)	24,369,327
Weighted Average Occupancy unaudited (as a percent)	92.20%
Manhattan | Office
Real estate properties
Number of Properties | building	31
Approximate Square Feet unaudited (sqft)	22,612,745
Weighted Average Occupancy unaudited (as a percent)	93.40%
Manhattan | Retail
Real estate properties
Number of Properties | building	13
Approximate Square Feet unaudited (sqft)	650,553
Weighted Average Occupancy unaudited (as a percent)	94.50%
Manhattan | Development/Redevelopment
Real estate properties
Number of Properties | building	11
Approximate Square Feet unaudited (sqft)	929,499
Weighted Average Occupancy unaudited (as a percent)	59.90%
Manhattan | Fee Interest
Real estate properties
Number of Properties | building	2
Approximate Square Feet unaudited (sqft)	176,530
Weighted Average Occupancy unaudited (as a percent)	100.00%
Manhattan | Residential
Real estate properties
Number of Properties | building	15
Approximate Square Feet unaudited (sqft)	3,128,961
Weighted Average Occupancy unaudited (as a percent)	86.40%
Manhattan | Consolidated properties
Real estate properties
Number of Properties | building	36
Approximate Square Feet unaudited (sqft)	16,692,704
Manhattan | Consolidated properties | Office
Real estate properties
Number of Properties | building	24
Approximate Square Feet unaudited (sqft)	16,054,606
Manhattan | Consolidated properties | Retail
Real estate properties
Number of Properties | building	4
Approximate Square Feet unaudited (sqft)	302,583
Manhattan | Consolidated properties | Development/Redevelopment
Real estate properties
Number of Properties | building	7
Approximate Square Feet unaudited (sqft)	158,985
Manhattan | Consolidated properties | Fee Interest
Real estate properties
Number of Properties | building	1
Approximate Square Feet unaudited (sqft)	176,530
Manhattan | Consolidated properties | Residential
Real estate properties
Number of Properties | building	3
Approximate Square Feet unaudited (sqft)	472,105
Manhattan | Consolidated properties | Dual property type, retail portion
Real estate properties
Approximate Square Feet unaudited (sqft)	270,132
Manhattan | Consolidated properties | Dual property type, residential portion
Real estate properties
Approximate Square Feet unaudited (sqft)	222,855
Manhattan | Unconsolidated properties
Real estate properties
Number of Properties | building	21
Approximate Square Feet unaudited (sqft)	7,676,623
Manhattan | Unconsolidated properties | Office
Real estate properties
Number of Properties | building	7
Approximate Square Feet unaudited (sqft)	6,558,139
Manhattan | Unconsolidated properties | Retail
Real estate properties
Number of Properties | building	9
Approximate Square Feet unaudited (sqft)	347,970
Manhattan | Unconsolidated properties | Development/Redevelopment
Real estate properties
Number of Properties | building	4
Approximate Square Feet unaudited (sqft)	770,514
Manhattan | Unconsolidated properties | Fee Interest
Real estate properties
Number of Properties | building	1
Approximate Square Feet unaudited (sqft)	0
Manhattan | Unconsolidated properties | Residential
Real estate properties
Number of Properties | building	12
Approximate Square Feet unaudited (sqft)	2,656,856
Suburban
Real estate properties
Number of Properties | building	27
Approximate Square Feet unaudited (sqft)	4,301,800
Weighted Average Occupancy unaudited (as a percent)	83.30%
Suburban | Office
Real estate properties
Number of Properties | building	24
Approximate Square Feet unaudited (sqft)	4,248,800
Weighted Average Occupancy unaudited (as a percent)	83.10%
Suburban | Retail
Real estate properties
Number of Properties | building	1
Approximate Square Feet unaudited (sqft)	52,000
Weighted Average Occupancy unaudited (as a percent)	100.00%
Suburban | Development/Redevelopment
Real estate properties
Number of Properties | building	2
Approximate Square Feet unaudited (sqft)	1,000
Weighted Average Occupancy unaudited (as a percent)	100.00%
Suburban | Residential
Real estate properties
Number of Properties | building	0
Approximate Square Feet unaudited (sqft)	0
Weighted Average Occupancy unaudited (as a percent)	0.00%
Suburban | Consolidated properties
Real estate properties
Number of Properties | building	24
Approximate Square Feet unaudited (sqft)	3,661,800
Suburban | Consolidated properties | Office
Real estate properties
Number of Properties | building	22
Approximate Square Feet unaudited (sqft)	3,608,800
Suburban | Consolidated properties | Retail
Real estate properties
Number of Properties | building	1
Approximate Square Feet unaudited (sqft)	52,000
Suburban | Consolidated properties | Development/Redevelopment
Real estate properties
Number of Properties | building	1
Approximate Square Feet unaudited (sqft)	1,000
Suburban | Consolidated properties | Residential
Real estate properties
Number of Properties | building	0
Approximate Square Feet unaudited (sqft)	0
Suburban | Unconsolidated properties
Real estate properties
Number of Properties | building	3
Approximate Square Feet unaudited (sqft)	640,000
Suburban | Unconsolidated properties | Office
Real estate properties
Number of Properties | building	2
Approximate Square Feet unaudited (sqft)	640,000
Suburban | Unconsolidated properties | Retail
Real estate properties
Number of Properties | building	0
Approximate Square Feet unaudited (sqft)	0
Suburban | Unconsolidated properties | Development/Redevelopment
Real estate properties
Number of Properties | building	1
Approximate Square Feet unaudited (sqft)	0
Suburban | Unconsolidated properties | Residential
Real estate properties
Number of Properties | building	0
Approximate Square Feet unaudited (sqft)	0

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Significant Accounting Policies - Investments in Commercial Real Estate Properties (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Investment in Commercial Real Estate Properties
Depreciable real estate reserves	$ 0	$ 0	$ (85,336,000)	$ (10,387,000)
Rental revenue from amortization of acquired leases	4,600,000	200,000	15,800,000	191,400,000
Reduction in interest expense from amortization of above-market rate mortgages	0	700,000	800,000	2,000,000
Identified intangible assets (included in other assets):
Gross amount	474,493,000		474,493,000		$ 651,099,000
Accumulated amortization	(398,047,000)		(398,047,000)		(410,930,000)
Net	76,446,000		76,446,000		240,169,000
Identified intangible liabilities (included in deferred revenue):
Gross amount	639,511,000		639,511,000		655,930,000
Accumulated amortization	(474,365,000)		(474,365,000)		(464,749,000)
Net	165,146,000		165,146,000		191,181,000
Net intangible assets reclassed to assets held for sale	3,900,000		3,900,000		0
Net intangible liabilities reclassed to liabilities relates to assets held for sale	1,100,000		$ 1,100,000		$ 0
Minimum | Above-market leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)			1 year
Minimum | Below-market leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)			1 year
Minimum | In-place leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)			1 year
Maximum | Above-market leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)			14 years
Maximum | Below-market leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)			14 years
Maximum | In-place leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)			14 years
Building | Minimum
Investment in Commercial Real Estate Properties
Estimated useful life (in years)			3 years
Building | Maximum
Investment in Commercial Real Estate Properties
Estimated useful life (in years)			40 years
388-390 Greenwich Street
Investment in Commercial Real Estate Properties
Amortization of below market lease		$ 0		$ 172,400,000
125 Chubb Avenue and Stamford Towers
Investment in Commercial Real Estate Properties
Depreciable real estate reserves	$ 0		$ 85,300,000

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Significant Accounting Policies - Investment in Marketable Securities (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Investment in Marketable Securities
Marketable securities	$ 28,802,000		$ 28,802,000		$ 85,110,000
Cost basis	27,500,000		27,500,000		36,000,000
Proceeds from sale of marketable securities	800,000	$ 1,700,000	55,200,000	$ 6,900,000
Fair Value
Investment in Marketable Securities
Marketable securities	28,802,000		28,802,000		85,110,000
Equity marketable securities
Investment in Marketable Securities
Marketable securities	0		0		48,315,000
Cost basis	0		0		43,300,000
Commercial mortgage-backed securities
Investment in Marketable Securities
Marketable securities	$ 28,802,000		$ 28,802,000		$ 36,795,000

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Significant Accounting Policies - Revenue Recognition/Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
Income taxes
Federal, state and local tax provision	$ 0.1	$ 2.8

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Significant Accounting Policies - Concentrations of Credit Risk/Accounting Standards Updates (Details) - Annualized rent - Customer concentration	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017 Tenant
Concentration of Credit Risk
Number of tenants (tenants)		2
Maximum percentage of annualized rent for any one tenant not individually disclosed (percent) (more than)	5.00%	5.00%
1515 Broadway
Concentration of Credit Risk
Percentage of concentration (percent)	8.90%
11 Madison Avenue
Concentration of Credit Risk
Percentage of concentration (percent)	6.30%
1185 Avenue of the Americas
Concentration of Credit Risk
Percentage of concentration (percent)	6.20%
420 Lexington Avenue
Concentration of Credit Risk
Percentage of concentration (percent)	5.40%
Tenant 1
Concentration of Credit Risk
Percentage of concentration (percent)		8.80%
Tenant 2
Concentration of Credit Risk
Percentage of concentration (percent)		6.70%

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Properties Held for Sale and Property Dispositions (Details) $ in Millions	1 Months Ended				9 Months Ended
	Sep. 30, 2017 ft²	Jul. 31, 2017 USD ($) ft²	Apr. 30, 2017 USD ($) ft²	Feb. 29, 2016 USD ($) ft²	Sep. 30, 2017 USD ($) ft²	Oct. 31, 2017 USD ($)
Properties Sold [Abstract]
Approximate Square Feet | ft²	31,800,088				31,800,088
885 Third Avenue
Properties Sold [Abstract]
Approximate Square Feet | ft²				607,000
Sales Price				$ 453.0
Gain on Sale (Loss)				$ (8.8)
520 White Plains Road
Properties Sold [Abstract]
Approximate Square Feet | ft²			180,000
Sales Price			$ 21.0
Gain on Sale (Loss)			$ (14.6)
102 Greene Street
Properties Sold [Abstract]
Approximate Square Feet | ft²			9,200
Sales Price			$ 43.5
Gain on Sale (Loss)			$ 4.9
Employee compensation award					$ 0.9
Joint venture, ownership percentage sold	10.00%		90.00%
680/750 Washington Boulevard
Properties Sold [Abstract]
Approximate Square Feet | ft²		325,000
Sales Price		$ 97.0
Gain on Sale (Loss)		$ (44.2)
Subsequent Event | 16 Court
Properties Sold [Abstract]
Sales Price						$ 171.0

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Debt and Preferred Equity Investments - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2017	Feb. 28, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2014
Mortgage Loans on Real Estate [Line Items]
Aggregate weighted average current yield (as a percent)	9.49%
Debt Investments Held [Abstract]
Carrying Value	$ 2,020,739,000		$ 1,640,412,000
Mezzanine/Jr. Mortgage Loan with an Initial Maturity Date of April 2017
Debt Investments Held [Abstract]
Carrying Value	250,200,000		0	$ 0
Mezzanine Loan with an Initial Maturity Date of March 2020
Debt Investments Held [Abstract]
Amount participated out	1,200,000
Mezzanine Loan, with an Initial Maturity Date of June 2024
Debt Investments Held [Abstract]
Amount participated out	12,000,000
Mezzanine Loan with an Initial Maturity Date of December 2017
Debt Investments Held [Abstract]
Amount participated out	14,600,000
Mezzanine Loan with an Initial Maturity Date of December 2017, 2
Debt Investments Held [Abstract]
Amount participated out	14,100,000
Mortgage Mezzanine Loan with an Initial Maturity Date of December 2017
Debt Investments Held [Abstract]
Amount participated out	5,100,000
Mortgage/Mezzanine Loan with an Initial Maturity Date of January 2019
Debt Investments Held [Abstract]
Amount participated out	21,200,000
Debt Investments in Mortgage Loans
Debt Investments Held [Abstract]
Future Funding Obligations	181,320,000
Senior Financing	7,115,310,000
Carrying Value	1,876,759,000		1,592,537,000
Total fixed rate
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	3,617,095,000
Carrying Value	632,834,000		360,359,000
Total fixed rate | Mezzanine/Jr. Mortgage Loan with an Initial Maturity Date of April 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	250,164,000		0
Loan acquired	259,300,000
Total fixed rate | Mortgage Loan, February 2019
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	26,352,000		26,311,000
Loan acquired					$ 26,400,000
Discount amount					200,000
Total fixed rate | Mortgage Loan, August 2019
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	275,000		380,000
Total fixed rate | Mezzanine Loan with an Initial Maturity Date of March 2020
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	1,160,000,000
Carrying Value	201,757,000		0
Total fixed rate | Mezzanine Loan, September 2021
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	15,000,000
Carrying Value	3,500,000		3,500,000
Total fixed rate | Mezzanine Loan with an Initial Maturity Date of April 2022
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	147,000,000
Carrying Value	24,909,000		0
Total fixed rate | Mezzanine Loan, November 2023
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	87,595,000
Carrying Value	12,697,000		12,692,000
Total fixed rate | Mezzanine Loan, with an Initial Maturity Date of June 2024
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	115,000,000
Carrying Value	12,930,000		12,925,000
Total fixed rate | Mezzanine Loan, January 2025
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	95,000,000
Carrying Value	30,000,000		30,000,000
Total fixed rate | Mezzanine Loan with an Initial Maturity Date of November 2026
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	340,000,000
Carrying Value	15,000,000		15,000,000
Total fixed rate | Mezzanine Loan with an Initial Maturity Date of June 2027
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	1,657,500,000
Carrying Value	55,250,000		0
Total fixed rate | Mezzanine Loan, June 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	0		66,129,000
Total fixed rate | Junior Mortgage Participation/Mezzanine Loan, March 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	0		193,422,000
Total fixed rate | Junior Mortgage Participation, Related To Mortgage Loan, February 2019
Debt Investments Held [Abstract]
Loan acquired					5,700,000
Discount amount					$ 5,700,000
Total floating rate
Debt Investments Held [Abstract]
Future Funding Obligations	181,320,000
Senior Financing	3,498,215,000
Carrying Value	1,243,925,000		1,232,178,000
Total floating rate | Mortgage/Mezzanine Loan with an Initial Maturity Date of October 2017
Debt Investments Held [Abstract]
Future Funding Obligations	622,000
Senior Financing	0
Carrying Value	23,372,000		20,423,000
Total floating rate | Mezzanine Loan with an Initial Maturity Date of December 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	85,000,000
Carrying Value	15,340,000		15,141,000
Total floating rate | Mezzanine Loan with an Initial Maturity Date of December 2017, 2
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	65,000,000
Carrying Value	14,832,000		14,656,000
Total floating rate | Mortgage Mezzanine Loan with an Initial Maturity Date of December 2017
Debt Investments Held [Abstract]
Future Funding Obligations	795,000
Senior Financing	0
Carrying Value	15,132,000		15,051,000
Total floating rate | Mortgage/Mezzanine Loan with an Initial Maturity Date of January 2018
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	125,000,000
Carrying Value	29,966,000		29,998,000
Total floating rate | Mezzanine Loan with an Initial Maturity Date of April 2018
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	40,000,000
Carrying Value	19,964,000		19,913,000
Total floating rate | Junior Mortgage Participation Loan with an Initial Maturity Date of April 2018
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	117,808,000
Carrying Value	34,899,000		34,844,000
Total floating rate | Mezzanine Loan with an Initial Maturity Date of August 2018
Debt Investments Held [Abstract]
Future Funding Obligations	523,000
Senior Financing	20,523,000
Carrying Value	10,916,000		10,863,000
Total floating rate | Mortgage/Mezzanine Loan, with an Initial Maturity Date of August 2018
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	19,914,000		19,840,000
Total floating rate | Mortgage Loan with an Initial Maturity Date of August 2018
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	65,000,000
Carrying Value	14,935,000		14,880,000
Total floating rate | Mortgage/Mezzanine Loan, September 2018
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	16,957,000		16,960,000
Total floating rate | Mezzanine Loan with an Initial Maturity Date of September 2018
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	37,500,000
Carrying Value	14,801,000		14,648,000
Total floating rate | Mezzanine Loan with an Initial Maturity Date of October 2018
Debt Investments Held [Abstract]
Future Funding Obligations	2,325,000
Senior Financing	45,025,000
Carrying Value	34,782,000		34,502,000
Total floating rate | Mezzanine Loan with an Initial Maturity Date of November 2018
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	335,000,000
Carrying Value	74,683,000		74,476,000
Total floating rate | Mezzanine Loan with an Initial Maturity Date of December 2018
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	33,000,000
Carrying Value	26,907,000		26,850,000
Total floating rate | Mezzanine Loan with an Initial Maturity Date of December 2018, 2
Debt Investments Held [Abstract]
Future Funding Obligations	1,050,000
Senior Financing	171,939,000
Carrying Value	58,598,000		56,114,000
Total floating rate | Mezzanine Loan with an Initial Maturity Date of December 2018, 3
Debt Investments Held [Abstract]
Future Funding Obligations	8,267,000
Senior Financing	289,621,000
Carrying Value	71,067,000		63,137,000
Total floating rate | Mezzanine Loan with an Initial Maturity Date of December 2018, 4
Debt Investments Held [Abstract]
Future Funding Obligations	5,197,000
Senior Financing	229,084,000
Carrying Value	74,314,000		64,505,000
Total floating rate | Mezzanine Loan with an Initial Maturity Date of January 2019
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	45,000,000
Carrying Value	12,156,000		12,104,000
Total floating rate | Mortgage/Mezzanine Loan with an Initial Maturity Date of January 2019
Debt Investments Held [Abstract]
Future Funding Obligations	30,101,000
Senior Financing	0
Carrying Value	158,757,000		0
Total floating rate | Mezzanine Loan with an Initial Maturity of January 2019, 2
Debt Investments Held [Abstract]
Future Funding Obligations	6,081,000
Senior Financing	24,086,000
Carrying Value	7,812,000		5,410,000
Total floating rate | Mezzanine Loan with an Initial Maturity of March 2019
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	38,000,000
Carrying Value	21,927,000		21,891,000
Total floating rate | Mezzanine Loan with an Initial Maturity Date of April 2019
Debt Investments Held [Abstract]
Future Funding Obligations	279,000
Senior Financing	173,700,000
Carrying Value	36,936,000		0
Total floating rate | Mezzanine Loan with an Initial Maturity Date of April 2019, 2 [Member]
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	265,000,000
Carrying Value	24,798,000		24,707,000
Total floating rate | Mortgage/Jr Mortgage Participate Loan, Maturity Date of August 2019
Debt Investments Held [Abstract]
Future Funding Obligations	29,661,000
Senior Financing	194,094,000
Carrying Value	69,705,000		65,554,000
Total floating rate | Mezzanine Loan, Maturity of September 2019
Debt Investments Held [Abstract]
Future Funding Obligations	2,034,000
Senior Financing	187,500,000
Carrying Value	37,835,000		37,322,000
Total floating rate | Mortgage/Mezzanine Loan with an Initial Maturity of September 2019
Debt Investments Held [Abstract]
Future Funding Obligations	49,933,000
Senior Financing	0
Carrying Value	130,350,000		111,819,000
Total floating rate | Mortgage/Mezzanine Loan with an Initial Maturity of January 2020
Debt Investments Held [Abstract]
Future Funding Obligations	30,494,000
Senior Financing	0
Carrying Value	38,934,000		33,682,000
Total floating rate | Mezzanine Loan with an Initial Maturity of January 2020
Debt Investments Held [Abstract]
Future Funding Obligations	6,794,000
Senior Financing	537,748,000
Carrying Value	72,597,000	$ 66,100,000	125,911,000
Total floating rate | Mezzanine Loan with an Initial Maturity of July 2020 [Domain]
Debt Investments Held [Abstract]
Future Funding Obligations	7,164,000
Senior Financing	33,587,000
Carrying Value	10,988,000		0
Total floating rate | Jr Mortgage Participation/Mezzanine Loan with an Initial Maturity of July 2021
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	60,000,000
Carrying Value	15,627,000		15,606,000
Total floating rate | Mezzanine Loan with an Initial Maturity of August 2022
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	280,000,000
Carrying Value	34,124,000		0
Total floating rate | Mezzanine Loan, with an Initial Maturity Date of September 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	0		15,369,000
Total floating rate | Mortgage/Mezzanine Loan repaid in June 2017, 2
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	0		32,847,000
Total floating rate | Mortgage/Mezzanine Loan repaid in June 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	0		22,959,000
Total floating rate | Mezzanine Loan Contributed for a Joint Venture Interest
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	0		14,957,000
Total floating rate | Mortgage/Mezzanine Loan Repaid in January 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	$ 0		$ 145,239,000

XML

Debt and Preferred Equity Investments - Rollforward of Net Book Balance (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 1,640,412	$ 1,670,020
Redemptions/Sales/Syndications/Amortization	(708,180)	(1,044,482)
Carrying Value	2,020,739	1,640,412
Debt Investments in Mortgage Loans
Mortgage Loans on Real Estate [Line Items]
Originations/Accretion	944,494	1,009,176
Preferred equity investments
Mortgage Loans on Real Estate [Line Items]
Originations/Accretion	$ 144,013	$ 5,698

XML

Debt and Preferred Equity Investments - Preferred Equity Investments (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Preferred equity investment
Aggregate weighted average current yield (as a percent)	9.49%
Carrying Value	$ 2,020,739	$ 1,640,412
Preferred Equity, April 2021
Preferred equity investment
Future Funding Obligations	0
Senior Financing	272,000
Carrying Value	143,980	0
Preferred Equity redeemed in May 2017
Preferred equity investment
Future Funding Obligations	0
Senior Financing	0
Carrying Value	0	9,982
Preferred Equity redeemed in April 2017
Preferred equity investment
Future Funding Obligations	0
Senior Financing	0
Carrying Value	$ 0	37,893
Preferred equity investments
Preferred equity investment
Aggregate weighted average current yield (as a percent)	6.98%
Future Funding Obligations	$ 0
Senior Financing	272,000
Carrying Value	$ 143,980	$ 47,875

XML

Debt and Preferred Equity Investments - Narrative (Details)	9 Months Ended	37 Months Ended
	Sep. 30, 2017 USD ($) segment	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Preferred equity investment
Carrying Value	$ 2,020,739,000	$ 2,020,739,000	$ 1,640,412,000
Number of portfolio segments of financial receivables (segment) | segment	1
Additional amount of financing receivables included in other assets	$ 65,600,000	65,600,000	99,500,000
Mezzanine/Jr. Mortgage Loan with an Initial Maturity Date of April 2017
Preferred equity investment
Carrying Value	250,200,000	250,200,000	0	$ 0
Junior Mortgage Participation Acquired in September 2014
Preferred equity investment
Payments to acquire loans		0
Carrying Value	0	0	$ 0	$ 0
Total fixed rate | Mezzanine/Jr. Mortgage Loan with an Initial Maturity Date of April 2017
Preferred equity investment
Receivable with Imputed Interest, Face Amount	$ 259,300,000	$ 259,300,000

XML

Investments in Unconsolidated Joint Ventures - Additional Information (Details) $ in Thousands	1 Months Ended
	May 31, 2017 USD ($)	Oct. 31, 2016	Sep. 30, 2017 USD ($) ft² unit	Apr. 30, 2017 ft²	Jan. 31, 2017 partner	Dec. 31, 2016 USD ($)
General information on each joint venture
Net equity investment in VIEs in which the entity is not primary beneficiary | $			$ 598,700			$ 220,100
Unaudited Approximate Square Feet (sqft) | ft²			31,800,088
100 Park Avenue
General information on each joint venture
Ownership Interest			49.90%
Economic Interest (as a percent)			49.90%
Unaudited Approximate Square Feet (sqft) | ft²			834,000
Acquisition Price | $			$ 95,800
717 Fifth Avenue
General information on each joint venture
Ownership Interest			10.92%
Economic Interest (as a percent)			10.92%
Unaudited Approximate Square Feet (sqft) | ft²			119,500
Acquisition Price | $			$ 251,900
800 Third Avenue
General information on each joint venture
Ownership Interest			60.52%
Economic Interest (as a percent)			60.52%
Unaudited Approximate Square Feet (sqft) | ft²			526,000
Acquisition Price | $			$ 285,000
1745 Broadway
General information on each joint venture
Ownership Interest			56.87%
Economic Interest (as a percent)			56.87%
Unaudited Approximate Square Feet (sqft) | ft²			674,000
Acquisition Price | $			$ 520,000
Jericho Plaza
General information on each joint venture
Ownership Interest			11.67%
Economic Interest (as a percent)			11.67%
Unaudited Approximate Square Feet (sqft) | ft²			640,000
Acquisition Price | $			$ 210,000
11 West 34th Street
General information on each joint venture
Ownership Interest			30.00%
Economic Interest (as a percent)			30.00%
Unaudited Approximate Square Feet (sqft) | ft²			17,150
Acquisition Price | $			$ 10,800
3 Columbus Circle
General information on each joint venture
Ownership Interest			48.90%
Economic Interest (as a percent)			48.90%
Unaudited Approximate Square Feet (sqft) | ft²			741,500
Acquisition Price | $			$ 500,000
280 Park Avenue
General information on each joint venture
Ownership Interest			50.00%
Economic Interest (as a percent)			50.00%
Unaudited Approximate Square Feet (sqft) | ft²			1,219,158
Acquisition Price | $			$ 400,000
1552-1560 Broadway
General information on each joint venture
Ownership Interest			50.00%
Economic Interest (as a percent)			50.00%
Unaudited Approximate Square Feet (sqft) | ft²			57,718
Acquisition Price | $			$ 136,550
724 Fifth Avenue
General information on each joint venture
Ownership Interest			50.00%
Economic Interest (as a percent)			50.00%
Unaudited Approximate Square Feet (sqft) | ft²			65,010
Acquisition Price | $			$ 223,000
10 East 53rd Street
General information on each joint venture
Ownership Interest			55.00%
Economic Interest (as a percent)			55.00%
Unaudited Approximate Square Feet (sqft) | ft²			354,300
Acquisition Price | $			$ 252,500
521 Fifth Avenue
General information on each joint venture
Ownership Interest			50.50%
Economic Interest (as a percent)			50.50%
Unaudited Approximate Square Feet (sqft) | ft²			460,000
Acquisition Price | $			$ 315,000
21 East 66th Street
General information on each joint venture
Ownership Interest			32.28%
Economic Interest (as a percent)			32.28%
Unaudited Approximate Square Feet (sqft) | ft²			13,069
Acquisition Price | $			$ 75,000
650 Fifth Avenue
General information on each joint venture
Ownership Interest			50.00%
Economic Interest (as a percent)			50.00%
Unaudited Approximate Square Feet (sqft) | ft²			69,214
Acquisition Price | $			$ 0
121 Greene Street
General information on each joint venture
Ownership Interest			50.00%
Economic Interest (as a percent)			50.00%
Unaudited Approximate Square Feet (sqft) | ft²			7,131
Acquisition Price | $			$ 27,400
175-225 Third Street Brooklyn, New York
General information on each joint venture
Ownership Interest			95.00%
Economic Interest (as a percent)			95.00%
Unaudited Approximate Square Feet (sqft) | ft²			0
Acquisition Price | $			$ 74,600
55 West 46th Street
General information on each joint venture
Ownership Interest			25.00%
Economic Interest (as a percent)			25.00%
Unaudited Approximate Square Feet (sqft) | ft²			347,000
Acquisition Price | $			$ 295,000
Stonehenge Portfolio
General information on each joint venture
Ownership Interest		90.00%
Unaudited Approximate Square Feet (sqft) | ft²			1,439,016
Acquisition Price | $			$ 36,668
Stonehenge Portfolio | Joint venture
General information on each joint venture
Ownership Interest		10.00%
131-137 Spring Street
General information on each joint venture
Ownership Interest			20.00%
Economic Interest (as a percent)			20.00%
Unaudited Approximate Square Feet (sqft) | ft²			68,342
Acquisition Price | $			$ 277,750
605 West 42nd Street
General information on each joint venture
Ownership Interest			20.00%
Economic Interest (as a percent)			20.00%
Unaudited Approximate Square Feet (sqft) | ft²			927,358
Acquisition Price | $			$ 759,000
11 Madison Avenue
General information on each joint venture
Ownership Interest			60.00%
Economic Interest (as a percent)			60.00%
Unaudited Approximate Square Feet (sqft) | ft²			2,314,000
Acquisition Price | $			$ 2,605,000
333 East 22nd St
General information on each joint venture
Ownership Interest			33.33%
Economic Interest (as a percent)			33.33%
Unaudited Approximate Square Feet (sqft) | ft²			26,926
Acquisition Price | $			$ 0
East 400 Street 57
General information on each joint venture
Ownership Interest		51.00%	51.00%
Economic Interest (as a percent)			41.00%
Unaudited Approximate Square Feet (sqft) | ft²			290,482
Acquisition Price | $			$ 170,000
1552 Broadway
General information on each joint venture
Unaudited Approximate Square Feet (sqft) | ft²			13,045
One Vanderbilt
General information on each joint venture
Ownership Interest			71.01%
Economic Interest (as a percent)			71.01%
Unaudited Approximate Square Feet (sqft) | ft²			0
Acquisition Price | $			$ 3,310,000
Number of joint venture partners | partner					2
Aggregate equity committed by partners | $			$ 525,000
Maximum ownership percentage of partners			29.00%
Partners' ownership percentage			3.49%
Equity method investment, amount sold | $	$ 10,000
102 Greene Street
General information on each joint venture
Ownership Interest			10.00%
East 400 Street 57
General information on each joint venture
Ownership percentage in disposed asset		49.00%
102 Greene Street
General information on each joint venture
Unaudited Approximate Square Feet (sqft) | ft²				9,200
21 East 66th Street | Three Retail and Two Residential Units
General information on each joint venture
Ownership Interest			3228.00%
Number of stores | unit			3
Number of residential units | unit			2
21 East 66th Street | Three Residential Units
General information on each joint venture
Ownership Interest			1614.00%
Number of residential units | unit			3
Mezzanine Loan
General information on each joint venture
Ownership Interest	33.33%		33.33%
Economic Interest (as a percent)			33.33%
Unaudited Approximate Square Feet (sqft) | ft²			0
Acquisition Price | $			$ 15,000

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Investments in Unconsolidated Joint Ventures - Acquisition, Development and Construction Arrangements/Sale of Joint Venture Interest or Property (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	May 31, 2017 note	Dec. 31, 2016 USD ($)	Oct. 31, 2016
Schedule of Equity Method Investments [Line Items]
Acquisition, development and construction arrangements, carrying value	$ 170,735		$ 170,735			$ 170,164
Gain (loss) on sale of real estate, net	0	$ 397	(3,256)	$ 210,750
Mezzanine Loan and Preferred Equity Due March 2018
Schedule of Equity Method Investments [Line Items]
Acquisition, development and construction arrangements, carrying value	100,000		100,000			100,000
Mezzanine loan due February 2022
Schedule of Equity Method Investments [Line Items]
Acquisition, development and construction arrangements, carrying value	44,881		44,881			45,622
Mezzanine loan due July 2036
Schedule of Equity Method Investments [Line Items]
Acquisition, development and construction arrangements, carrying value	25,854		25,854			$ 24,542
Stonehenge Portfolio
Schedule of Equity Method Investments [Line Items]
Ownership Interest							90.00%
Gross Asset Valuation	$ 300,000		300,000
Gain on Sale			$ 871
102 Greene Street
Schedule of Equity Method Investments [Line Items]
Ownership Interest	10.00%		10.00%
Gross Asset Valuation	$ 43,500		$ 43,500
Gain on Sale			$ 283
747 Madison Avenue
Schedule of Equity Method Investments [Line Items]
Gain (loss) on sale of real estate, net	$ 13,000
76 11th Avenue
Schedule of Equity Method Investments [Line Items]
Number of notes owned by joint venture partner | note					2

XML

Investments in Unconsolidated Joint Ventures - Mortgages and Other Loans Payable (Details)	9 Months Ended
	Sep. 30, 2017 USD ($) extenstion_option	Oct. 31, 2017 USD ($)	Aug. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Total fixed rate debt	$ 3,286,248,000			$ 3,518,127,000
Total floating rate debt	558,813,000			622,585,000
Total fixed rate and floating rate debt	$ 3,845,061,000			4,140,712,000
Number of extension options | extenstion_option	2
Period of extension options	1 year
521 Fifth Avenue
Debt Instrument [Line Items]
Economic Interest (as a percent)	50.50%
717 Fifth Avenue
Debt Instrument [Line Items]
Economic Interest (as a percent)	10.92%
650 Fifth Avenue
Debt Instrument [Line Items]
Economic Interest (as a percent)	50.00%
21 East 66th Street
Debt Instrument [Line Items]
Economic Interest (as a percent)	32.28%
3 Columbus Circle
Debt Instrument [Line Items]
Economic Interest (as a percent)	48.90%
11 Madison Avenue
Debt Instrument [Line Items]
Economic Interest (as a percent)	60.00%
800 Third Avenue
Debt Instrument [Line Items]
Economic Interest (as a percent)	60.52%
East 400 Street 57
Debt Instrument [Line Items]
Economic Interest (as a percent)	41.00%
1745 Broadway
Debt Instrument [Line Items]
Economic Interest (as a percent)	56.87%
55 West 46th Street
Debt Instrument [Line Items]
Economic Interest (as a percent)	25.00%
175-225 Third Street Brooklyn, New York
Debt Instrument [Line Items]
Economic Interest (as a percent)	95.00%
Jericho Plaza
Debt Instrument [Line Items]
Economic Interest (as a percent)	11.67%
724 Fifth Avenue
Debt Instrument [Line Items]
Economic Interest (as a percent)	50.00%
1552 Broadway
Debt Instrument [Line Items]
Economic Interest (as a percent)	50.00%
280 Park Avenue (9)
Debt Instrument [Line Items]
Economic Interest (as a percent)	50.00%
121 Greene Street
Debt Instrument [Line Items]
Economic Interest (as a percent)	50.00%
10 East 53rd Street
Debt Instrument [Line Items]
Economic Interest (as a percent)	55.00%
131-137 Spring Street
Debt Instrument [Line Items]
Economic Interest (as a percent)	20.00%
11 West 34th Street
Debt Instrument [Line Items]
Economic Interest (as a percent)	30.00%
100 Park Avenue
Debt Instrument [Line Items]
Economic Interest (as a percent)	49.90%
One Vanderbilt
Debt Instrument [Line Items]
Economic Interest (as a percent)	71.01%
Total floating rate debt	$ 0			64,030,000
One Vanderbilt | Construction Loans
Debt Instrument [Line Items]
Term (in Years)	5 years
Maximum facility capacity	$ 1,500,000,000.0
Credit facility, interest rate (as a percent)	3.50%
Number of extension options | extenstion_option	2
Period of extension options	1 year
605 West 42nd Street
Debt Instrument [Line Items]
Economic Interest (as a percent)	20.00%
Joint venture
Debt Instrument [Line Items]
Total fixed rate debt	$ 3,448,423,000			3,566,846,000
Total floating rate debt	3,877,504,000			2,982,528,000
Total fixed rate and floating rate debt	7,325,927,000			6,549,374,000
Deferred financing costs, net	(127,318,000)			(95,408,000)
Total joint venture mortgages and other loans payable, net	7,198,609,000			6,453,966,000
Joint venture | 521 Fifth Avenue
Debt Instrument [Line Items]
Total fixed rate debt	170,000,000			170,000,000
Joint venture | 717 Fifth Avenue | Mortgage loan
Debt Instrument [Line Items]
Committed amount	300,000,000
Joint venture | 717 Fifth Avenue | Mezzanine loans
Debt Instrument [Line Items]
Committed amount	355,300,000
Joint venture | 717 Fifth Avenue | Initial Maturity July 2022
Debt Instrument [Line Items]
Total fixed rate debt	300,000,000			300,000,000
Joint venture | 717 Fifth Avenue | Initial Maturity July 2022, 2
Debt Instrument [Line Items]
Total fixed rate debt	355,328,000			355,328,000
Joint venture | 650 Fifth Avenue
Debt Instrument [Line Items]
Total floating rate debt	0			77,500,000
Joint venture | 650 Fifth Avenue | Initial Maturity October 2022
Debt Instrument [Line Items]
Total fixed rate debt	225,000,000			0
Joint venture | 21 East 66th Street
Debt Instrument [Line Items]
Total fixed rate debt	12,000,000			12,000,000
Total floating rate debt	1,667,000			1,726,000
Joint venture | 3 Columbus Circle
Debt Instrument [Line Items]
Total fixed rate debt	350,000,000			350,000,000
Joint venture | 11 Madison Avenue
Debt Instrument [Line Items]
Total fixed rate debt	1,400,000,000			1,400,000,000
Joint venture | 800 Third Avenue
Debt Instrument [Line Items]
Total fixed rate debt	177,000,000			177,000,000
Joint venture | East 400 Street 57
Debt Instrument [Line Items]
Total fixed rate debt	100,000,000			100,000,000
Joint venture | Stonehenge Portfolio
Debt Instrument [Line Items]
Total fixed rate debt	359,095,000			362,518,000
Total floating rate debt	55,340,000			65,577,000
Joint venture | Stonehenge Portfolio | Initial Maturity November 2017
Debt Instrument [Line Items]
Total fixed rate debt	34,000,000
Joint venture | Stonehenge Portfolio | Initial Maturity August 2019
Debt Instrument [Line Items]
Total fixed rate debt	137,700,000
Joint venture | Stonehenge Portfolio | Initial Maturity June 2024
Debt Instrument [Line Items]
Total fixed rate debt	172,500,000
Joint venture | Stonehenge Portfolio | Initial Maturity February 2027
Debt Instrument [Line Items]
Total fixed rate debt	14,900,000
Joint venture | 1745 Broadway
Debt Instrument [Line Items]
Total fixed rate debt	0			340,000,000
Total floating rate debt	345,000,000			0
Joint venture | 1745 Broadway | Mortgage loan
Debt Instrument [Line Items]
Committed amount	375,000,000
Unfunded amount	30,000,000
Joint venture | 55 West 46th Street
Debt Instrument [Line Items]
Total floating rate debt	165,328,000			157,322,000
Joint venture | 55 West 46th Street | Mortgage loan
Debt Instrument [Line Items]
Committed amount	190,000,000
Unfunded amount	24,700,000
Joint venture | 175-225 Third Street Brooklyn, New York
Debt Instrument [Line Items]
Total floating rate debt	40,000,000			40,000,000
Joint venture | Jericho Plaza
Debt Instrument [Line Items]
Total floating rate debt	$ 79,530,000			76,993,000
Term (in Years)	2 years
Face amount of loan	$ 100,000,000
Joint venture | 724 Fifth Avenue
Debt Instrument [Line Items]
Total floating rate debt	275,000,000			275,000,000
Joint venture | 1552 Broadway
Debt Instrument [Line Items]
Total floating rate debt	185,410,000			185,410,000
Joint venture | 1552 Broadway | Mortgage loan
Debt Instrument [Line Items]
Committed amount	145,000,000
Unfunded amount	600,000
Joint venture | 1552 Broadway | Mezzanine loans
Debt Instrument [Line Items]
Committed amount	41,500,000
Unfunded amount	500,000
Joint venture | 280 Park Avenue (9)
Debt Instrument [Line Items]
Total floating rate debt	1,200,000,000			900,000,000
Joint venture | 280 Park Avenue (9) | Mortgage loan
Debt Instrument [Line Items]
Committed amount			$ 1,075,000,000
Joint venture | 280 Park Avenue (9) | Mezzanine loans
Debt Instrument [Line Items]
Committed amount			125,000,000
Joint venture | 121 Greene Street
Debt Instrument [Line Items]
Total floating rate debt	15,000,000			15,000,000
Joint venture | 10 East 53rd Street
Debt Instrument [Line Items]
Total floating rate debt	170,000,000			125,000,000
Joint venture | 131-137 Spring Street
Debt Instrument [Line Items]
Total floating rate debt	141,000,000			141,000,000
Joint venture | 11 West 34th Street
Debt Instrument [Line Items]
Total floating rate debt	23,000,000			23,000,000
Joint venture | 100 Park Avenue
Debt Instrument [Line Items]
Total floating rate debt	360,000,000			360,000,000
Joint venture | One Vanderbilt
Debt Instrument [Line Items]
Total floating rate debt	271,229,000			0
Joint venture | 605 West 42nd Street
Debt Instrument [Line Items]
Total floating rate debt	$ 550,000,000			$ 539,000,000
Joint venture | 605 West 42nd Street | Mortgage loan
Debt Instrument [Line Items]
Committed amount			$ 550,000,000
Weighted Average | One Vanderbilt
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)
Weighted Average | Joint venture | 521 Fifth Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.73%
Weighted Average | Joint venture | 717 Fifth Avenue | Initial Maturity July 2022
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.45%
Weighted Average | Joint venture | 717 Fifth Avenue | Initial Maturity July 2022, 2
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	5.50%
Weighted Average | Joint venture | 650 Fifth Avenue | Initial Maturity October 2022
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.95%
Weighted Average | Joint venture | 21 East 66th Street
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.60%
Interest rate, floating rate debt (as a percent)	3.62%
Weighted Average | Joint venture | 3 Columbus Circle
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.61%
Weighted Average | Joint venture | 11 Madison Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.84%
Weighted Average | Joint venture | 800 Third Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.37%
Weighted Average | Joint venture | East 400 Street 57
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.00%
Weighted Average | Joint venture | Stonehenge Portfolio
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.17%
Interest rate, floating rate debt (as a percent)	2.47%
Weighted Average | Joint venture | 1745 Broadway
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	3.07%
Weighted Average | Joint venture | 55 West 46th Street
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	3.52%
Weighted Average | Joint venture | 175-225 Third Street Brooklyn, New York
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	5.25%
Weighted Average | Joint venture | Jericho Plaza
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	5.37%
Weighted Average | Joint venture | 724 Fifth Avenue
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	3.64%
Weighted Average | Joint venture | 1552 Broadway
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	5.41%
Weighted Average | Joint venture | 280 Park Avenue (9)
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	3.09%
Weighted Average | Joint venture | 121 Greene Street
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	2.72%
Weighted Average | Joint venture | 10 East 53rd Street
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	3.47%
Weighted Average | Joint venture | 131-137 Spring Street
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	2.77%
Weighted Average | Joint venture | 11 West 34th Street
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	2.68%
Weighted Average | Joint venture | 100 Park Avenue
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	2.97%
Weighted Average | Joint venture | One Vanderbilt
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	4.72%
Weighted Average | Joint venture | 605 West 42nd Street
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	2.84%
LIBOR | Joint venture | 280 Park Avenue (9) | Mortgage loan
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)			1.48%
LIBOR | Joint venture | 280 Park Avenue (9) | Mezzanine loans
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)			3.85%
LIBOR | Joint venture | 605 West 42nd Street | Mortgage loan
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)			1.44%
Subsequent Event | Joint venture | 55 West 46th Street | Mortgage loan
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		2.13%
Committed amount		$ 195,000,000
Subsequent Event | Joint venture | 1552 Broadway | Mortgage loan
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		2.65%
Committed amount		$ 195,000,000

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Investments in Unconsolidated Joint Ventures - Schedules of Combined Financial Statements for the Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Assets
Commercial real estate property, net	$ 9,421,501		$ 9,421,501		$ 10,478,638
Cash and cash equivalents	241,489	$ 405,896	241,489	$ 405,896	279,443	$ 255,399
Tenant and other receivables, related party receivables, and deferred rents receivable, net of allowance	54,663		54,663		53,772
Other assets	395,612		395,612		614,067
Liabilities and members' equity
Mortgages and other loans payable, net	3,804,174		3,804,174		4,073,830
Deferred revenue/gain	252,779		252,779		217,955
Other liabilities	95,718		95,718		206,238
Company's investments in unconsolidated joint ventures	2,045,796		2,045,796		1,890,186
Combined statements of income for the unconsolidated joint ventures
Operating expenses	75,927	79,425	221,285	234,269
Ground rent	8,307	8,338	24,923	24,953
Real estate taxes	64,160	64,133	186,173	187,931
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
Transaction related costs	186	2,593	365	5,987
Depreciation and amortization	91,728	112,665	318,916	717,015
Total expenses	333,913	369,992	1,032,337	1,520,635
Company's equity in net income (loss) from unconsolidated joint ventures	4,078	(3,968)	14,104	11,969
Joint venture
Investment in Unconsolidated Joint Ventures
Management fees, base revenue	2,900	2,000	28,100	4,500
Assets
Commercial real estate property, net	9,944,280		9,944,280		9,131,717
Cash and cash equivalents	370,596		370,596		328,455
Tenant and other receivables, related party receivables, and deferred rents receivable, net of allowance	267,244		267,244		232,778
Debt and preferred equity investments, net	201,731		201,731		336,164
Other assets	636,365		636,365		683,481
Total assets	11,420,216		11,420,216		10,712,595
Liabilities and members' equity
Mortgages and other loans payable, net	7,198,609		7,198,609		6,453,966
Deferred revenue/gain	340,310		340,310		356,414
Other liabilities	411,261		411,261		391,500
Members' equity	3,470,036		3,470,036		3,510,715
Total liabilities and members' equity	11,420,216		11,420,216		$ 10,712,595
Combined statements of income for the unconsolidated joint ventures
Total revenues	216,100	184,221	643,210	498,308
Operating expenses	38,055	34,727	115,996	89,147
Ground rent	4,182	3,744	12,612	10,670
Real estate taxes	37,282	30,814	107,391	79,356
Interest expense, net of interest income	61,066	51,789	176,096	147,876
Amortization of deferred financing costs	4,030	7,155	17,994	17,667
Transaction related costs	0	5,359	146	5,359
Depreciation and amortization	61,447	56,890	198,556	132,035
Total expenses	206,062	190,478	628,791	482,110
Loss on early extinguishment of debt	(7,638)	0	(7,638)	(1,606)
Net income (loss) before gain on sale	2,400	(6,257)	6,781	14,592
Company's equity in net income (loss) from unconsolidated joint ventures	$ 4,078	$ (3,968)	$ 14,104	$ 11,969

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Deferred Costs (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred leasing costs	$ 464,788	$ 468,971
Less: accumulated amortization	(216,807)	(201,371)
Deferred costs, net	$ 247,981	$ 267,600

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Mortgages and Other Loans Payable (Details)	9 Months Ended
	Sep. 30, 2017 USD ($) extenstion_option debt_instrument $ / shares	Jan. 31, 2017 partner	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)
Debt Instrument [Line Items]
Total fixed rate debt	$ 3,286,248,000		$ 3,518,127,000
Total floating rate debt	558,813,000		622,585,000
Total fixed rate and floating rate debt	3,845,061,000		4,140,712,000
Mortgages reclassed to liabilities related to assets held for sale	0		0
Total mortgages and other loans payable	3,845,061,000		4,140,712,000
Deferred financing costs, net of amortization	(40,887,000)		(66,882,000)
Total mortgages and other loans payable, net	3,804,174,000		4,073,830,000
Book value of collateral	$ 6,700,000,000		6,000,000,000
Number of extension options | extenstion_option	2
Period of extension options	1 year
Outstanding under line of credit facility	$ 275,832,000		0
Series J Preferred Units
Debt Instrument [Line Items]
Total fixed rate debt	4,000,000		4,000,000
Limited partnership interest	$ 4,000,000
Preferred units (as a percent)	3.75%
Preferred units, liquidation preference (in dollars per unit) | $ / shares	$ 1,000.00
Series J Preferred Units | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.75%
Unsecured Loan
Debt Instrument [Line Items]
Total fixed rate debt	$ 16,000,000		16,000,000
Unsecured Loan | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.81%
FHLB Advance Maturing in January 2017
Debt Instrument [Line Items]
Total fixed rate debt	$ 0		105,000,000
FHLB Advance Maturing in January 2017, 2
Debt Instrument [Line Items]
Total fixed rate debt	0		100,000,000
Master Repurchase Agreement
Debt Instrument [Line Items]
Total floating rate debt	$ 184,642,000		184,642,000
Term (in Years)	2 years
Maximum facility capacity	$ 300,000,000.0
Period of extension options	1 year
Basis point fee (as a percent)	0.25%
Outstanding under line of credit facility	$ 182,800,000
Threshold amount for basis point fee to be applicable (less than)	$ 150,000,000.0
Master Repurchase Agreement | Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	3.73%
Master Repurchase Agreement | Minimum | LIBOR
Debt Instrument [Line Items]
Credit facility, interest rate (as a percent)	2.25%
Master Repurchase Agreement | Maximum | LIBOR
Debt Instrument [Line Items]
Credit facility, interest rate (as a percent)	4.00%
Uncommitted Master Repurchase Agreements
Debt Instrument [Line Items]
Number of debt instruments | debt_instrument	2
Uncommitted Master Repurchase Agreement, 2
Debt Instrument [Line Items]
Term (in Years)	1 year
Maximum facility capacity	$ 300,000,000.0
Outstanding under line of credit facility	(1,100,000)
One Madison Avenue
Debt Instrument [Line Items]
Total fixed rate debt	$ 494,264,000		517,806,000
One Madison Avenue | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	5.91%
762 Madison Avenue
Debt Instrument [Line Items]
Total fixed rate debt	$ 771,000		7,694,000
762 Madison Avenue | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	5.00%
100 Church Street
Debt Instrument [Line Items]
Total fixed rate debt	$ 218,237,000		221,446,000
100 Church Street | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.68%
919 Third Avenue
Debt Instrument [Line Items]
Total fixed rate debt	$ 500,000,000		500,000,000
Interest in property (as a percent)	51.00%
919 Third Avenue | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	5.12%
420 Lexington Avenue
Debt Instrument [Line Items]
Total fixed rate debt	$ 300,000,000		300,000,000
420 Lexington Avenue | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.99%
1515 Broadway
Debt Instrument [Line Items]
Total fixed rate debt	$ 876,613,000		888,531,000
1515 Broadway | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.93%
400 East 58th Street
Debt Instrument [Line Items]
Total fixed rate debt	$ 40,000,000		40,000,000
400 East 58th Street | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.00%
Term (in Years)	5 years
Landmark Square
Debt Instrument [Line Items]
Total fixed rate debt	$ 100,000,000		100,000,000
Landmark Square | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.90%
485 Lexington Avenue
Debt Instrument [Line Items]
Total fixed rate debt	$ 450,000,000		450,000,000
485 Lexington Avenue | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.25%
1080 Amsterdam Avenue
Debt Instrument [Line Items]
Total fixed rate debt	$ 36,363,000		0
Total fixed rate debt	35,500,000
Subordinate loan	$ 900,000
1080 Amsterdam Avenue | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.58%
Term (in Years)	5 years
1080 Amsterdam Avenue | Mortgage loan | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.50%
1080 Amsterdam Avenue | Subordinate loan | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	7.00%
315 West 33rd Street
Debt Instrument [Line Items]
Total fixed rate debt	$ 250,000,000		0
315 West 33rd Street | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.17%
885 Third Avenue
Debt Instrument [Line Items]
Total fixed rate debt	$ 0		267,650,000
885 Third Avenue | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)
719 Seventh Avenue
Debt Instrument [Line Items]
Total floating rate debt	$ 41,171,000		37,388,000
719 Seventh Avenue | Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	4.27%
183, 187 Broadway & 5-7 Dey Street
Debt Instrument [Line Items]
Total floating rate debt	$ 58,000,000		58,000,000
183, 187 Broadway & 5-7 Dey Street | Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	3.92%
220 East 42nd Street
Debt Instrument [Line Items]
Total floating rate debt	$ 275,000,000		275,000,000
220 East 42nd Street | Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	2.82%
One Vanderbilt
Debt Instrument [Line Items]
Total floating rate debt	$ 0		64,030,000
Number of joint venture partners | partner		2
One Vanderbilt | Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)
One Vanderbilt | Construction Loans
Debt Instrument [Line Items]
Maximum facility capacity				$ 1,500,000,000.0
Number of joint venture partners | partner		2
1080 Amsterdam
Debt Instrument [Line Items]
Total floating rate debt	$ 0		$ 3,525,000

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Corporate Indebtedness - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Corporate Indebtedness
Outstanding under line of credit facility	$ 275,832,000	$ 0
Long-term debt, carrying value	6,477,061,000
Revolving credit facility
Corporate Indebtedness
Credit facility, maximum borrowing capacity	1,600,000,000.0
Maximum borrowing capacity, optional expansion	$ 3,000,000,000.0
Effective rate (as a percent)	2.49%
Facility fee (as a percent)	0.25%
Outstanding under line of credit facility	$ 280,000,000
Revolving credit facility | Minimum
Corporate Indebtedness
Facility fee (as a percent)	0.125%
Revolving credit facility | Maximum
Corporate Indebtedness
Facility fee (as a percent)	0.30%
Revolving credit facility | LIBOR
Corporate Indebtedness
Interest rate added to base rate (as a percent)	1.25%
Revolving credit facility | LIBOR | Minimum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	0.875%
Revolving credit facility | LIBOR | Maximum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	1.55%
Term loan
Corporate Indebtedness
Credit facility, maximum borrowing capacity	$ 1,200,000,000.0
Effective rate (as a percent)	2.49%
Long-term debt, carrying value	$ 1,183,000,000
Term loan | Line of Credit
Corporate Indebtedness
Long-term debt, carrying value	$ 1,200,000,000	1,200,000,000
Term loan | LIBOR
Corporate Indebtedness
Interest rate added to base rate (as a percent)	1.40%
Term loan | LIBOR | Minimum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	0.95%
Term loan | LIBOR | Maximum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	1.90%
2012 Credit Facility
Corporate Indebtedness
Letters of credit	$ 80,800,000
Ability to borrow under line of credit facility	1,200,000,000
Long-term debt, carrying value	280,000,000
2012 Credit Facility | Line of Credit
Corporate Indebtedness
Long-term debt, carrying value	$ 275,800,000	$ (6,300,000)

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Corporate Indebtedness - Senior Unsecured Notes (Details) - USD ($)	1 Months Ended	9 Months Ended
	Oct. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Debt disclosures by scheduled maturity date
Accreted Balance		$ 1,180,506,000	$ 1,179,521,000
Senior unsecured notes
Debt disclosures by scheduled maturity date
Unpaid Principal Balance		1,069,000,000
Accreted Balance		1,068,562,000	1,133,957,000
Deferred financing costs, net		(4,018,000)	(5,642,000)
Accreted Balance, net of deferred financing costs		1,064,544,000	1,128,315,000
Senior unsecured notes | 3.00% Senior unsecured notes maturing on October 15, 2017
Debt disclosures by scheduled maturity date
Unpaid Principal Balance		269,000,000
Accreted Balance		$ 268,628,000	334,077,000
Coupon Rate (as a percent)		3.00%
Effective rate (as a percent)		3.00%
Initial Term (in Years)		7 years
Senior unsecured notes | 5.00% Senior unsecured notes maturing on August 15, 2018
Debt disclosures by scheduled maturity date
Unpaid Principal Balance		$ 250,000,000
Accreted Balance		$ 249,934,000	249,880,000
Coupon Rate (as a percent)		5.00%
Effective rate (as a percent)		5.00%
Initial Term (in Years)		7 years
Senior unsecured notes | 7.75% Senior unsecured notes maturing on March 15, 2020
Debt disclosures by scheduled maturity date
Unpaid Principal Balance		$ 250,000,000
Accreted Balance		$ 250,000,000	250,000,000
Coupon Rate (as a percent)		7.75%
Effective rate (as a percent)		7.75%
Initial Term (in Years)		10 years
Senior unsecured notes | 4.50% Senior unsecured notes maturing on December 1, 2022
Debt disclosures by scheduled maturity date
Unpaid Principal Balance		$ 200,000,000
Accreted Balance		$ 200,000,000	200,000,000
Coupon Rate (as a percent)		4.50%
Effective rate (as a percent)		4.50%
Initial Term (in Years)		10 years
Senior unsecured notes | 4.27% Senior unsecured notes maturing on December 17, 2025
Debt disclosures by scheduled maturity date
Unpaid Principal Balance		$ 100,000,000
Accreted Balance		$ 100,000,000	$ 100,000,000
Coupon Rate (as a percent)		4.27%
Effective rate (as a percent)		4.27%
Initial Term (in Years)		10 years
Subsequent Event | Senior unsecured notes | 3.00% Senior unsecured notes maturing on October 15, 2017
Debt disclosures by scheduled maturity date
Repayments of debt	$ 350,800,000
Subsequent Event | Senior unsecured notes | 3.25 Percent Senior Unsecured Notes Due October 2022
Debt disclosures by scheduled maturity date
Coupon Rate (as a percent)	3.25%
Face amount of loan	$ 500,000,000.0
Subsequent Event | Senior Unsecured Bonds | 4.50% Senior Unsecured Bonds Due December 2022
Debt disclosures by scheduled maturity date
Coupon Rate (as a percent)	4.50%
Effective rate (as a percent)	3.298%
Face amount of loan	$ 100,000,000
Redemption price, percentage	105.334%

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Corporate Indebtedness - Junior Subordinated Deferrable Interest Debentures and Principal Maturities (Details) - USD ($)	1 Months Ended	9 Months Ended
	Jun. 30, 2005	Sep. 30, 2017
Scheduled Amortization and Principal Repayments
Remaining 2017		$ 281,846,000
2018		604,750,000
2019		1,242,618,000
2020		1,250,958,000
2021		30,418,000
Thereafter		3,066,471,000
Total amortization of debt and principal repayments		6,477,061,000
Joint Venture Debt
Principal Repayments and Joint Venture Debt
Remaining 2017		79,787,000
2018		242,799,000
2019		705,574,000
2020		320,914,000
2021		376,765,000
Thereafter		1,465,371,000
Total principal repayments		3,191,210,000
Trust Preferred Securities
Debt Instrument [Line Items]
Proceeds from issuance of debt	$ 100,000,000.0
Scheduled Amortization and Principal Repayments
Remaining 2017		0
2018		0
2019		0
2020		0
2021		0
Thereafter		100,000,000
Total amortization of debt and principal repayments		100,000,000
Mortgages and other loans payable
Scheduled Amortization
Remaining 2017		12,846,000
2018		54,937,000
2019		59,618,000
2020		41,427,000
2021		30,418,000
Thereafter		90,532,000
Total amortization of debt		289,778,000
Principal Repayments and Joint Venture Debt
Remaining 2017		0
2018		299,813,000
2019		0
2020		679,531,000
2021		0
Thereafter		2,575,939,000
Total principal repayments		3,555,283,000
Revolving Credit Facility
Scheduled Amortization and Principal Repayments
Remaining 2017		0
2018		0
2019		0
2020		280,000,000
2021		0
Thereafter		0
Total amortization of debt and principal repayments		280,000,000
Unsecured Term Loan
Scheduled Amortization and Principal Repayments
Remaining 2017		0
2018		0
2019		1,183,000,000
2020		0
2021		0
Thereafter		0
Total amortization of debt and principal repayments		1,183,000,000
Senior Unsecured Notes
Scheduled Amortization and Principal Repayments
Remaining 2017		269,000,000
2018		250,000,000
2019		0
2020		250,000,000
2021		0
Thereafter		300,000,000
Total amortization of debt and principal repayments		$ 1,069,000,000
LIBOR | Trust Preferred Securities
Debt Instrument [Line Items]
Interest rate added to base rate (as a percent)		1.25%
Effective interest rate (as a percent)		2.52%
LIBOR | Unsecured Term Loan
Debt Instrument [Line Items]
Interest rate added to base rate (as a percent)		1.40%

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Corporate Indebtedness - Schedule of Consolidated Interest Expense, Excluding Capitalized Interest (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest expense
Interest expense before capitalized interest	$ 72,859	$ 78,715	$ 217,273	$ 276,437
Interest capitalized	(6,869)	(6,084)	(19,892)	(18,135)
Interest income	(356)	(66)	(1,269)	(1,976)
Interest expense, net	$ 65,634	$ 72,565	$ 196,112	$ 256,326

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Related Party Transactions (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2017
Amounts due from/to related parties
Due from joint ventures	$ 1,240	$ 16,736		$ 16,736
Other	14,616	7,332		7,332
Related party receivables	$ 15,856	24,068		24,068
Alliance Building Services
Related Party Transactions
Profit participation from related party		1,000	$ 800	3,000	$ 2,600
Payments made for services		5,700	5,300	16,000	16,100
Entity with Stephen L Green ownership interest
Related Party Transactions
Property management fees from related party		100	$ 100	400	$ 300
One Vanderbilt
Related Party Transactions
Due from related party, percentage received (as a percentage)	50.00%
One Vanderbilt | Marc Holliday
Related Party Transactions
Due from related party		1,400		1,400
One Vanderbilt | Andrew Mathias
Related Party Transactions
Due from related party		$ 1,000		$ 1,000
One Vanderbilt | Minimum | Marc Holliday
Related Party Transactions
Percentage of profits due to investors (as a percentage)	1.50%
One Vanderbilt | Minimum | Andrew Mathias
Related Party Transactions
Percentage of profits due to investors (as a percentage)	1.00%
One Vanderbilt | Maximum | Marc Holliday
Related Party Transactions
Percentage of profits due to investors (as a percentage)	1.80%
One Vanderbilt | Maximum | Andrew Mathias
Related Party Transactions
Percentage of profits due to investors (as a percentage)	1.20%
Scenario, Forecast | One Vanderbilt
Related Party Transactions
Due from related party, percentage received (as a percentage)						50.00%

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Noncontrolling Interests on the Company's Consolidated Financial Statements - Additional Information (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($) shares $ / shares	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) shares $ / shares	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) shares	Mar. 31, 2016 shares	Aug. 31, 2015 shares	Jul. 31, 2015 shares	Jun. 30, 2015 shares	Feb. 28, 2015 shares	Aug. 31, 2014 shares
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Balance at beginning of period | $			$ 473,882,000
Net income | $	$ 1,812,000	$ 1,663,000	2,707,000	$ 8,171,000
Accumulated other comprehensive income allocation | $	(4,000)	118,000	(303,000)	(257,000)
Balance at end of period | $	$ 470,898,000		$ 470,898,000		$ 473,882,000
Number of company common stock issued on conversion of Series B preferred units			6.71348
SL Green Operating Partnership
Organization
Noncontrolling interest in the operating partnership (as a percent)	4.45%		4.45%		4.16%
Number of units of operating partnership owned by the noncontrolling interest unit holders (shares) | shares	4,541,765		4,541,765		4,363,716
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) | shares	4,541,765.000		4,541,765.000
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Balance at beginning of period | $			$ 473,882,000	424,206,000	$ 424,206,000
Distributions | $			(10,639,000)		(12,671,000)
Issuance of common units | $			23,273,000		78,495,000
Redemption of common units | $			(15,353,000)		(31,805,000)
Net income | $			2,707,000		10,136,000
Accumulated other comprehensive income allocation | $	$ (4,000)	$ 118,000	(303,000)	$ (257,000)	1,299,000
Fair value adjustment | $			(2,669,000)		4,222,000
Balance at end of period | $	$ 470,898,000		$ 470,898,000		$ 473,882,000
SL Green Operating Partnership | Series G Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares	1,902,000		1,902,000
Dividend rate preferred units (as a percent)			4.50%
Liquidation preference of preferred units (in dollars per share)	$ 25.00		$ 25.00
Annual dividends on preferred units (in dollars per share)			1.125
Operating partnership common stock value use for conversion of preferred units (in dollars per share)	$ 88.50		$ 88.50
Number of company common stock issue on redemption of operation partnership common units			1
SL Green Operating Partnership | Series F Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares	60		60
Mandatory liquidation preference (in dollars per share) | $	$ 1,000.00		$ 1,000.00
SL Green Operating Partnership | Series K Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares											563,954
Dividend rate preferred units (as a percent)			3.50%
Liquidation preference of preferred units (in dollars per share)	$ 25.00		$ 25.00
Annual dividends on preferred units (in dollars per share)			0.875
Operating partnership common stock value use for conversion of preferred units (in dollars per share)	$ 134.67		$ 134.67
Preferred units, shares authorized (in shares) | shares	700,000		700,000
SL Green Operating Partnership | Series L Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares											378,634
Dividend rate preferred units (as a percent)			4.00%
Liquidation preference of preferred units (in dollars per share)	$ 25.00		$ 25.00
Annual dividends on preferred units (in dollars per share)			$ 1.00
Preferred units, shares authorized (in shares) | shares	500,000		500,000
SL Green Operating Partnership | Series M Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares										1,600,000
Dividend rate preferred units (as a percent)			3.75%
Liquidation preference of preferred units (in dollars per share)	$ 25.00		$ 25.00
Annual dividends on preferred units (in dollars per share)			$ 0.9375
Preferred units, shares authorized (in shares) | shares	1,600,000		1,600,000
SL Green Operating Partnership | Series N Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares									552,303
Dividend rate preferred units (as a percent)			3.00%
Liquidation preference of preferred units (in dollars per share)	$ 25.00		$ 25.00
Annual dividends on preferred units (in dollars per share)			$ 0.75
Preferred units, shares authorized (in shares) | shares	552,303		552,303
SL Green Operating Partnership | Series O Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Dividend rate preferred units (as a percent)			6.25%
Preferred units, shares authorized (in shares) | shares	1		1
SL Green Operating Partnership | Series P Preferred Units
Organization
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) | shares	200,000		200,000
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares								200,000
Dividend rate preferred units (as a percent)			4.00%
Liquidation preference of preferred units (in dollars per share)	$ 25.00		$ 25.00
Annual dividends on preferred units (in dollars per share)			$ 1.00
SL Green Operating Partnership | Series Q Preferred Units
Organization
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) | shares	268,000		268,000
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares								268,000
Dividend rate preferred units (as a percent)			3.50%
Liquidation preference of preferred units (in dollars per share)	$ 25.00		$ 25.00
Annual dividends on preferred units (in dollars per share)			0.875
Operating partnership common stock value use for conversion of preferred units (in dollars per share)	$ 148.95		$ 148.95
SL Green Operating Partnership | Series R Preferred Units
Organization
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) | shares	400,000		400,000
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares							400,000
Dividend rate preferred units (as a percent)			3.50%
Liquidation preference of preferred units (in dollars per share)	$ 25.00		$ 25.00
Annual dividends on preferred units (in dollars per share)			0.875
Operating partnership common stock value use for conversion of preferred units (in dollars per share)	$ 154.89		$ 154.89
SL Green Operating Partnership | Series S Preferred Units
Organization
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) | shares	1,077,280		1,077,280
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares							1,077,280
Dividend rate preferred units (as a percent)			4.00%
Liquidation preference of preferred units (in dollars per share)	$ 25.00		$ 25.00
Annual dividends on preferred units (in dollars per share)			$ 1.00
SL Green Operating Partnership | Series T Preferred Units
Organization
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) | shares	230,000		230,000
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares						230,000
Dividend rate preferred units (as a percent)			2.75%
Liquidation preference of preferred units (in dollars per share)	$ 25.00		$ 25.00
Annual dividends on preferred units (in dollars per share)			0.6875
Operating partnership common stock value use for conversion of preferred units (in dollars per share)	$ 119.02		$ 119.02
SL Green Operating Partnership | Series U Preferred Units
Organization
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) | shares	680,000		680,000
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares						680,000
Dividend rate preferred units (as a percent)			4.50%
Liquidation preference of preferred units (in dollars per share)	$ 25.00		$ 25.00
Annual dividends on preferred units (in dollars per share)			1.125
SL Green Operating Partnership | Series U Preferred Units | Minimum
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Annual dividends on preferred units (in dollars per share)			$ 0.75
SL Green Operating Partnership | Series A Preferred Units
Organization
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) | shares	109,161		109,161
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares							109,161
Dividend rate preferred units (as a percent)			3.50%
Liquidation preference of preferred units (in dollars per share)	$ 1,000.00		$ 1,000.00
Annual dividends on preferred units (in dollars per share)			$ 35.00
SL Green Operating Partnership | Series B Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares	0		0

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Noncontrolling Interests on the Company's Consolidated Financial Statements - Common Unit Activity (Details) - SL Green Operating Partnership - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Rollforward Analysis of Preferred Unit Activity
Issuance of preferred units	$ 23,273	$ 78,495
Redemption of preferred units	(15,353)	(31,805)
Preferred Units
Rollforward Analysis of Preferred Unit Activity
Balance at beginning of period	302,010	282,516
Issuance of preferred units	0	22,793
Redemption of preferred units	(125)	(3,299)
Balance at end of period	$ 301,885	$ 302,010

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Stockholders' Equity of the Company - Additional Information (Details) - USD ($)	3 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Aug. 31, 2016
Equity, Class of Treasury Stock [Line Items]
Authorized capital stock (shares)	260,000,000
Authorized shares, par value (in dollars per share)	$ 0.01
Common stock, shares authorized (in shares)	160,000,000			160,000,000
Common stock, par value (in dollars per share)	$ 0.01			$ 0.01
Excess stock, shares authorized (shares)	75,000,000
Excess stock, par value (in dollars per share)	$ 0.01
Preferred stock, shares authorized (shares)	25,000,000
Preferred stock, par value (in dollars per share)	$ 0.01
Excess shares issued (shares)	0
Total number of shares purchased	951,866	2,447,153	982
Average price paid per share (in dollars per share)	$ 101.67	$ 103.41	$ 103.89
2016 Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount					$ 1,000,000,000.0
Total number of shares purchased	3,400,001	2,448,135	982
Maximum approximate dollar value of shares that may yet be purchased under the plan	$ 650,000,000	$ 746,800,000	$ 999,900,000

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Stockholders' Equity of the Company - Perpetual Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	9 Months Ended
	Aug. 31, 2012	Sep. 30, 2017	Dec. 31, 2016	Feb. 28, 2015
Stockholders' Equity
Common stock, shares authorized (in shares)		160,000,000	160,000,000
Series I Preferred Stock
Stockholders' Equity
Preferred stock, shares outstanding (in shares)		9,200,000	9,200,000
Dividend rate preferred units (as a percent)		6.50%
Perpetual preferred stock, liquidation preference (in dollars per share)		$ 25.00	$ 25.00
Perpetual preferred stock, annual dividends per share (in dollars per share)		$ 1.625
Contributions of net proceeds from sale of preferred stock	$ 221.9
Dividend Reinvestment and Stock Purchase Plan (DRIP)
Stockholders' Equity
Common stock, shares authorized (in shares)				3,500,000

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Stockholders' Equity of the Company - Earnings per Share (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Basic Earnings:
Income attributable to SL Green common stockholders	$ 38,869	$ 34,252	$ 58,442	$ 190,930
Diluted Earnings:
Income attributable to SL Green common stockholders	$ 40,681	$ 35,915	$ 61,149	$ 199,101
Basic Shares:
Weighted average common shares outstanding (shares)	97,783,000	100,233,000	99,431,000	100,140,000
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares (shares)	4,543,000	4,497,000	4,570,000	4,272,000
Stock-based compensation plans (shares)	244,000	413,000	279,000	349,000
Diluted weighted average common stock outstanding (shares)	102,570,000	105,143,000	104,280,000	104,761,000
Common stock shares excluded from the diluted shares outstanding (shares)	1,175,708	673,298	1,076,695	753,344
Common Stock
Effect of Dilutive Securities:
Redemption of units to common shares	$ 1,812	$ 1,663	$ 2,707	$ 8,171

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Partners' Capital of the Operating Partnership - Additional Information (Details)	9 Months Ended
	Sep. 30, 2017 shares	Dec. 31, 2016 shares
Common Stock
Stockholders' Equity
Units outstanding (units)	97,446,000	100,562,000
SL Green Operating Partnership
Stockholders' Equity
Noncontrolling interest in the operating partnership (as a percent)	4.45%	4.16%
Number of units of operating partnership owned by the noncontrolling interest unit holders (units)	4,541,765	4,363,716
SL Green Operating Partnership | Series I Preferred Units
Stockholders' Equity
Units outstanding (units)	9,200,000
Period of restriction to redeem OP Units	1 year
Conversion of stock, shares issued	1
SL Green Operating Partnership | Common Stock
Stockholders' Equity
Units outstanding (units)	97,445,509

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Partners' Capital of the Operating Partnership - EPS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Denominator
Weighted average common shares outstanding (shares)	97,783,000	100,233,000	99,431,000	100,140,000
Common stock shares excluded from the diluted shares outstanding (shares)	1,175,708	673,298	1,076,695	753,344
SL Green Operating Partnership
Numerator
Net income attributable to SLGOP common unitholders	$ 40,681	$ 35,915	$ 61,149	$ 199,101
Denominator
Weighted average common shares outstanding (shares)	102,326,000	104,730,000	104,001,000	104,412,000
Stock-based compensation plans (shares)	244,000	413,000	279,000	349,000
Diluted weighted average common units outstanding (shares)	102,570,000	105,143,000	104,280,000	104,761,000
Common stock shares excluded from the diluted shares outstanding (shares)	1,175,708	673,298	1,076,695	753,344

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Share-based Compensation - Additional Information (Details) $ / shares in Units, fungible_unit in Millions	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Aug. 31, 2014 shares	Sep. 30, 2017 USD ($) unit / shares unit fungible_unit shares	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) unit / shares unit fungible_unit $ / shares shares	Sep. 30, 2016 USD ($) shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 shares	Jan. 01, 2008 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options		$ 1,400,000	$ 1,500,000	$ 5,000,000	$ 4,400,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of commencement of option vesting, from date of grant (in years)				1 year
Exercise price of options granted, low end of the range (in dollars per share) | $ / shares				$ 20.67
Exercise price of options granted, high end of the range (in dollars per share) | $ / shares				$ 128.82
Remaining weighted average contractual life of the options outstanding (in years)				3 years 7 months
Remaining average contractual life of the options exercisable (in years)				2 years 9 months
Total unrecognized compensation cost related to unvested stock awards		10,600,000		$ 10,600,000
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)				1 year 8 months
Weighted average fair value of options granted during the period				$ 3,775,639		$ 8,363,036
Stock options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration period (in years)				5 years
Options vesting period (in years)				1 year
Stock options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration period (in years)				10 years
Options vesting period (in years)				5 years
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense				$ 7,277,054	7,153,966
Total unrecognized compensation cost related to unvested stock awards		$ 13,700,000		$ 13,700,000
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)				1 year 8 months
Annual award vesting rate, low end of range (as a percent)				15.00%
Annual award vesting rate, high end of range (as a percent)				35.00%
Fair value of restricted stock vested during the period				$ 8,400,000		$ 7,600,000
Weighted average fair value of options granted during the period				$ 30,813	$ 10,650,077
Awards granted (in shares) | shares				300	98,800
Awards outstanding (in shares) | shares		3,202,331		3,202,331		3,202,031	3,137,881
LTIP units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of options granted during the period				$ 20,500,000		$ 34,900,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to unvested stock awards		$ 7,100,000		$ 7,100,000
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)				1 year 2 months
Share-based compensation		$ 2,500,000	2,300,000	$ 15,100,000	$ 15,100,000
Third Amendment and Restated 2005 Stock Option and Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum fungible units that may be granted (in shares) | unit		27,030,000		27,030,000
Fungible units per share (in fungible units per share) | unit / shares		3.74		3.74
Shares that may be issued if equal to fungible units (shares) (less than) | shares		27,030,000		27,030,000
Fungible units | fungible_unit		8.7		8.7
Third Amendment and Restated 2005 Stock Option and Incentive Plan | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		$ 2,000,000	2,500,000	$ 5,900,000	6,400,000
Stock options, stock appreciation rights and other awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fungible units per share (in fungible units per share) | unit / shares		0.73		0.73
Award expiration period (in years)				5 years
All other awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fungible units per share (in fungible units per share) | unit / shares		1.0		1.0
Award expiration period (in years)				10 years
2014 Outperformance Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		$ 1,900,000	1,800,000	$ 8,200,000	6,600,000
Capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options				29,200,000
LTIP units earned (in shares) | shares	610,000
Award period (in years)	3 years
Performance period (in years)	3 years
Maximum award to be earned, if performance reaches maximum threshold, first performance period	0.333
Maximum award to be earned, if performance reaches maximum threshold, second performance period	0.667
2014 Outperformance Plan | Vesting on August 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of units vested	50.00%
2014 Outperformance Plan | Vesting on August 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of units vested	50.00%
Deferred Stock Compensation Plan for Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		$ 100,000	$ 100,000	$ 2,200,000	$ 1,900,000
Maximum percentage of the annual retainer fee, chairman fees and meeting fees that may be deferred by non-employee directors (percent)		100.00%		100.00%
Awards granted (in shares) | shares				11,510
Shares issued (in shares) | shares				9,171
Awards outstanding (in shares) | shares		98,637		98,637
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock available for issuance (shares) | shares								500,000
Duration of each offering period starting the first day of each calendar quarter (in months)				3 months
Discount from market price				85.00%
Shares of common stock issued (shares) | shares		101,882		101,882

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Share-based Compensation - Stock Options and Restricted Stock Activity (Details) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Stock options
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Dividend yield (as a percent)	2.50%		2.37%
Expected life of option (in years)	4 years 4 months 24 days		3 years 8 months 15 days
Risk-free interest rate (as a percent)	1.73%		1.57%
Expected stock price volatility (as a percent)	28.21%		26.76%
Options Outstanding
Balance at beginning of period (in shares)	1,737,213	1,595,007	1,595,007
Granted (in shares)	171,000		445,100
Exercised (in shares)	(146,277)		(192,875)
Lapsed or cancelled (in shares)	(65,300)		(110,019)
Balance at end of period (in shares)	1,696,636		1,737,213
Options exercisable at end of period (in shares)	939,485		748,617
Weighted average fair value of options granted during the period	$ 3,775,639		$ 8,363,036
Weighted Average Exercise Price
Balance at beginning of year (in dollars per share)	$ 98.44	$ 95.52	$ 95.52
Granted (in dollars per share)	105.70		105.86
Exercised (in dollars per share)	84.02		76.90
Lapsed or cancelled (in dollars per share)	122.30		123.86
Balance at end of period (in dollars per share)	99.50		98.44
Options exercisable at end of period (in dollars per share)	$ 91.71		$ 87.72
Restricted Stock Awards
Options Outstanding
Weighted average fair value of options granted during the period	$ 30,813	$ 10,650,077
Summary of restricted stock
Balance at beginning of year (in shares)	3,202,031	3,137,881	3,137,881
Granted (in shares)	300	98,800
Cancelled (in shares)	0	(34,650)
Balance at end of period (in shares)	3,202,331		3,202,031
Vested during the period (in shares)	86,736	83,822

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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	$ 7,750,911
Ending Balance	7,184,052
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	22,137
Ending Balance	14,185
SL Green Realty Corp
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Other comprehensive (loss) before reclassifications	(6,749)
Amounts reclassified from accumulated other comprehensive income	(1,203)
Deferred net losses from terminated hedges	3,700	$ 7,100
SL Green Realty Corp | Net unrealized (loss) gain on derivative instruments
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	12,596
Other comprehensive (loss) before reclassifications	(4,669)
Amounts reclassified from accumulated other comprehensive income	1,336
Ending Balance	9,263
SL Green Realty Corp | Net unrealized gain on marketable securities
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	5,520
Other comprehensive (loss) before reclassifications	(1,133)
Amounts reclassified from accumulated other comprehensive income	(3,130)
Ending Balance	1,257
SL Green Realty Corp | Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	22,137
Ending Balance	14,185
SL Green Realty Corp | Joint venture | Net unrealized (loss) gain on derivative instruments
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	4,021
Other comprehensive (loss) before reclassifications	(947)
Amounts reclassified from accumulated other comprehensive income	591
Ending Balance	$ 3,665

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Fair Value Measurements (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value of Financial Instruments
Marketable securities	$ 28,802,000	$ 85,110,000
Interest rate cap and swap agreements (included in other assets)	13,727,000	21,090,000
Debt and preferred equity investments	2,020,739,000	1,640,412,000
Equity method investments	2,045,796,000	1,890,186,000
Additional amount of financing receivables included in other assets	65,600,000	99,500,000
Accrued Interest Payable and Other Liabilities
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in accrued interest payable and other liabilities)		1,000
Carrying Value
Fair Value of Financial Instruments
Debt and preferred equity investments	2,020,739,000	1,640,412,000
Fixed rate debt	5,154,810,000	5,452,084,000
Variable rate debt	1,321,813,000	1,105,585,000
Total	6,476,623,000	6,557,669,000
Fair Value
Fair Value of Financial Instruments
Marketable securities	28,802,000	85,110,000
Total	6,713,093,000	6,832,604,000
Estimated fair value of debt and preferred equity investments, low end of range	2,000,000,000	1,600,000,000
Estimated fair value of debt and preferred equity investments, high end of range	2,200,000,000	1,800,000,000
Level 1
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in other assets)	0	0
Level 1 | Accrued Interest Payable and Other Liabilities
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in accrued interest payable and other liabilities)		0
Level 2
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in other assets)	13,727,000	21,090,000
Level 2 | Accrued Interest Payable and Other Liabilities
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in accrued interest payable and other liabilities)		1,000
Level 3
Fair Value of Financial Instruments
Marketable securities	0	0
Interest rate cap and swap agreements (included in other assets)	0	0
Level 3 | Accrued Interest Payable and Other Liabilities
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in accrued interest payable and other liabilities)		0
Level 3 | Fair Value
Fair Value of Financial Instruments
Fixed rate debt	5,398,870,000	5,722,494,000
Variable rate debt	1,314,223,000	1,110,110,000
Equity marketable securities
Fair Value of Financial Instruments
Marketable securities	0	48,315,000
Equity marketable securities | Level 1
Fair Value of Financial Instruments
Marketable securities	0	48,315,000
Commercial mortgage-backed securities
Fair Value of Financial Instruments
Marketable securities	28,802,000	36,795,000
Commercial mortgage-backed securities | Level 2
Fair Value of Financial Instruments
Marketable securities	28,802,000	36,795,000
Mezzanine/Jr. Mortgage Loan with an Initial Maturity Date of April 2017
Fair Value of Financial Instruments
Debt and preferred equity investments	250,200,000	$ 0	$ 0
Total fixed rate | Mezzanine/Jr. Mortgage Loan with an Initial Maturity Date of April 2017
Fair Value of Financial Instruments
Notes receivable	$ 250,000,000

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Financial Instruments: Derivatives and Hedging (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Financial Instruments: Derivatives and Hedging
Fair Value	$ 13,727,000		$ 13,727,000		$ 21,090,000
Derivative, fair value, net	13,727,000		13,727,000
Gain (loss) from changes in fair value	(100,000)	$ (100,000)	(100,000)	$ 500,000
Fair value of derivatives in a net liability position	0		0
Aggregate termination value	0		0
Estimated current balance held in accumulated other comprehensive loss to be reclassified into earnings within the next 12 months			800,000
Share of joint venture of accumulated other comprehensive loss reclassified into equity in net income from unconsolidated joint ventures within the next 12 months			300,000
Amount of (Loss) Recognized in Other Comprehensive Loss (Effective Portion)	(594,000)	(229,000)	(6,754,000)	(14,104,000)
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)	270,000	1,989,000	2,459,000	9,538,000
Amount of (Loss) Gain Recognized into Income (Ineffective Portion)	(44,000)	830,000	(113,000)	(244,000)
Joint venture
Financial Instruments: Derivatives and Hedging
Amount of (Loss) Recognized in Other Comprehensive Loss (Effective Portion)	(290,000)	(222,000)	(1,277,000)	(5,992,000)
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)	185,000	547,000	876,000	1,465,000
Amount of (Loss) Gain Recognized into Income (Ineffective Portion)	(48,000)	830,000	(109,000)	(206,000)
Interest Rate Swap Expiring in December 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000,000		$ 200,000,000
Strike Rate	0.9375%		0.9375%
Fair Value	$ 105,000		$ 105,000
Interest Rate Swap Expiring in December 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 150,000,000		$ 150,000,000
Strike Rate	0.94%		0.94%
Fair Value	$ 78,000		$ 78,000
Interest Rate Swap Expiring in December 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 150,000,000		$ 150,000,000
Strike Rate	0.94%		0.94%
Fair Value	$ 78,000		$ 78,000
Interest Rate Cap Expiring in September 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 137,500,000		$ 137,500,000
Strike Rate	4.00%		4.00%
Fair Value	$ 4,000		$ 4,000
Interest Rate Swap Expiring in July 2023
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000,000		$ 200,000,000
Strike Rate	1.131%		1.131%
Fair Value	$ 8,998,000		$ 8,998,000
Interest Rate Swap Expiring in July 2023
Financial Instruments: Derivatives and Hedging
Notional Value	$ 100,000,000		$ 100,000,000
Strike Rate	1.161%		1.161%
Fair Value	$ 4,335,000		$ 4,335,000
Interest Rate Swap Expiring in November 2027
Financial Instruments: Derivatives and Hedging
Notional Value	$ 100,000,000		$ 100,000,000
Strike Rate	2.287%		2.287%
Fair Value	$ 129,000		$ 129,000
Interest Rate Swaps/Caps
Financial Instruments: Derivatives and Hedging
Amount of (Loss) Recognized in Other Comprehensive Loss (Effective Portion)	(304,000)	(7,000)	(5,477,000)	(8,112,000)
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)	85,000	1,442,000	1,583,000	8,073,000
Amount of (Loss) Gain Recognized into Income (Ineffective Portion)	$ 4,000	$ 0	$ (4,000)	$ (38,000)

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Commitments and Contingencies (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Initial term of non cancellable operating leases, minimum (in years)	1 year
Capital lease
Remaining 2017	$ 597
2018	2,387
2019	2,411
2020	2,620
2021	2,794
Thereafter	822,688
Total minimum lease payments	833,497
Amount representing interest	(790,837)
Capital lease obligations	42,660
Non-cancellable operating leases
Remaining 2017	7,763
2018	31,049
2019	31,066
2020	31,436
2021	31,628
Thereafter	732,724
Total minimum lease payments	$ 865,666

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Segment Information - Additional Information (Details) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) segment	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Segment information
Number of reportable segments (segment) | segment				2
Total revenues		$ 374,600	$ 416,681	$ 1,150,131	$ 1,489,739
Net income (loss) before 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, and gain on sale of investment in marketable securities		44,765	42,721	131,898	(18,927)
Total assets	[1]	15,109,870		15,109,870		$ 15,857,787
Marketing, general and administrative		23,963	25,458	72,362	73,974
Operating Segments | Real Estate Segment
Segment information
Total revenues		326,780	341,285	1,001,390	1,315,392
Net income (loss) before 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, and gain on sale of investment in marketable securities		4,873	(32,731)	(504)	(187,222)
Total assets		12,939,363		12,939,363		13,868,672
Operating Segments | Debt and Preferred Equity Segment
Segment information
Total revenues		47,820	75,396	148,741	174,347
Net income (loss) before 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, and gain on sale of investment in marketable securities		39,892	$ 75,452	132,402	$ 168,295
Total assets		$ 2,170,507		$ 2,170,507		$ 1,989,115

[1] The Company's consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs"). See Note 2. The consolidated balance sheets include the following amounts related to our consolidated VIEs, excluding the Operating Partnership: $384.3 million and $412.3 million of land, $1.4 billion and $1.5 billion of building and improvements, $2.0 million and $2.0 million of building and leasehold improvements, $47.4 million and $47.4 million of properties under capital lease, $323.3 million and $327.2 million of accumulated depreciation, $235.4 million and $244.2 million of other assets included in other line items, $627.8 million and $621.8 million of real estate debt, net, $2.5 million and $2.2 million of accrued interest payable, $42.7 million and $42.1 million of capital lease obligations, and $58.5 million and $73.3 million of other liabilities included in other line items as of September 30, 2017 and December 31, 2016, respectively.

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Segment Information - Schedule of Reconciliation of Income from Continuing Operations to Net Income Attributable to SL Green Common Stockholders (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reconciliation of income from continuing operations to net income attributable to SL Green common stockholders
Net income (loss) before 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, and gain on sale of investment in marketable securities	$ 44,765	$ 42,721	$ 131,898	$ (18,927)
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

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Label	Element	Value
Stock Issued to Joint Venture	slg_StockIssuedtoJointVenture	$ 114,049,000