10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

______________________________________________________________________

FORM 10-Q

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

For the quarterly period ended March 31, 2021

OR

☐    TRANSITION 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	13-3956775
SL Green Operating Partnership, L.P.	Delaware	13-3960938
	(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

One Vanderbilt Avenue, New York, NY 10017

(Address of principal executive offices—Zip Code)

(212) 594-2700

(Registrant's telephone number, including area code)

420 Lexington Avenue, New York, NY 10170

(Former name or former address, if changed since last report)

______________________________________________________________________

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

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted 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 such files). 

SL Green Realty Corp.     Yes x    No o            SL 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	☐
Non-accelerated filer	☐
Smaller Reporting Company	☐	Emerging Growth Company	☐
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.			☐

SL Green Operating Partnership, L.P.

Large accelerated filer	☐	Accelerated filer	☐
Non-accelerated filer	x
Smaller Reporting Company	☐	Emerging Growth Company	☐
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.			☐

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 ☐    No x            SL Green Operating Partnership, L.P.    Yes ☐    No x

Securities registered pursuant to Section 12(b) of the Act:

Registrant	Trading Symbol	Title of Each Class	Name of Each Exchange on Which Registered
SL Green Realty Corp.	SLG	Common Stock, $0.01 par value	New York Stock Exchange
SL Green Realty Corp.	SLG.PRI	6.500% Series I Cumulative Redeemable Preferred Stock, $0.01 par value	New York Stock Exchange

As of May 7, 2021, 69,353,968 shares of SL Green Realty Corp.'s common stock, par value $0.01 per share, were outstanding. As of May 7, 2021, 1,025,366 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 March 31, 2021 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, including SL Green Operating Partnership, L.P.; 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 March 31, 2021 the Company owns 94.35% of the outstanding general and limited partnership interest in the Operating Partnership and owns 9,200,000 Series I Preferred Units of the Operating Partnership. As of March 31, 2021, noncontrolling investors held, in aggregate, a 5.65% 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; and

◦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, or the Exchange Act.

On December 4, 2020 our Board of Directors declared an ordinary dividend and a special dividend (together, "the Total Dividend"). The Total Dividend was paid on January 15, 2021 to shareholders of record at the close of business on December 15, 2020 ("the Record Date"). Shareholders had the opportunity to elect to receive the Total Dividend in the form of all cash or all stock, subject to proration if either option was oversubscribed. As a result of the elections made, the cash option was oversubscribed and was prorated. Shareholders who elected to receive cash received, for each share of common stock they

owned as of the Record Date, approximately $0.3735 in cash and 0.0279 shares of common stock. Shareholders who elected to receive shares received, for each share of common stock they owned as of the Record Date, approximately 0.0343 shares of common stock. The number of shares issued was calculated based on the volume weighted average trading price of SLG's common stock between January 5-7, 2021, of $58.15 per share.

To mitigate the dilutive impact of the common stock issued in the special dividend, the board of directors also authorized a reverse stock split, which was effective after markets closed on January 20, 2021. On January 8, 2021, a committee of the Board of Directors calculated the ratio for the reverse stock split of our issued and outstanding shares of common stock as 1.02918-for-1. After the issuance of the dividend and the completion of the reverse stock split, the number of shares of our common stock outstanding was equivalent to the number of total shares outstanding on the Record Date (not including any issuances or repurchases that occurred following the Record Date, as well as any fractional shares that would have been issued but for which cash-in-lieu was paid). However, on a relative basis, some individual shareholders may have more shares of SLG’s common stock, and some individual shareholders may have fewer shares of our common stock, depending on their individual elections to receive cash or stock and as a result of the cash option being oversubscribed.

All share-related references and measurements including the number of shares outstanding, share prices, number of shares repurchased, earnings per share, dividends per share, and share-based compensation awards, have been retroactively adjusted to reflect the reverse stock split for all periods presented in this Quarterly Report on Form 10-Q.

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

TABLE OF CONTENTS

PART I. FINANCIAL INFORMATION
Item 1.	FINANCIAL STATEMENTS	7
	FINANCIAL STATEMENTS OF SL GREEN REALTY CORP.
	Consolidated Balance Sheets as of March 31, 2021 (unaudited) and December 31, 2020	7
	Consolidated Statements of Operations for the three months ended March 31, 2021 and 2020 (unaudited)	9
	Consolidated Statements of Comprehensive Income for the three months ended March 31, 2021 and 2020 (unaudited)	10
	Consolidated Statements of Equity for the three months ended March 31, 2021 and 2020 (unaudited)	11
	Consolidated Statements of Cash Flows for the three months ended March 31, 2021 and 2020 (unaudited)	13
	FINANCIAL STATEMENTS OF SL GREEN OPERATING PARTNERSHIP, L.P.
	Consolidated Balance Sheets as of March 31, 2021 (unaudited) and December 31, 2020	16
	Consolidated Statements of Operations for the three months ended March 31, 2021 and 2020 (unaudited)	18
	Consolidated Statements of Comprehensive Income for the three months ended March 31, 2021 and 2020 (unaudited)	19
	Consolidated Statements of Capital for the three months ended March 31, 2021 and 2020 (unaudited)	20
	Consolidated Statements of Cash Flows for the three months ended March 31, 2021 and 2020 (unaudited)	22
	Notes to Consolidated Financial Statements (unaudited)	23
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	61
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	74
Item 4.	Controls and Procedures (SL Green Realty Corp. and SL Green Operating Partnership, L.P.)	75
PART II.	OTHER INFORMATION
Item 1.	Legal Proceedings	76
Item 1A.	Risk Factors	76
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	77
Item 3.	Defaults Upon Senior Securities	78
Item 4.	Mine Safety Disclosures	79
Item 5.	Other Information	80
Item 6.	Exhibits	81
	Signatures	82

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

PART I FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

5

SL Green Realty Corp.

Consolidated Balance Sheets

(in thousands)

	March 31, 2021		December 31, 2020
	(unaudited)
Assets
Commercial real estate properties, at cost:
Land and land interests	$	1,445,199	$	1,315,832
Building and improvements	4,096,930		4,168,193
Building leasehold and improvements	1,730,418		1,448,134
Right of use asset - financing leases	55,711		55,711
Right of use asset - operating leases	502,316		367,209
	7,830,574		7,355,079
Less: accumulated depreciation	(2,004,945)		(1,956,077)
	5,825,629		5,399,002
Cash and cash equivalents	304,999		266,059
Restricted cash	96,608		106,736
Investments in marketable securities	23,784		28,570
Tenant and other receivables	42,505		44,507
Related party receivables	34,310		34,657
Deferred rents receivable	304,420		302,791
Debt and preferred equity investments, net of discounts and deferred origination fees of $9,817 and $11,232 and allowances of $13,213 and $13,213 in 2021 and 2020, respectively	1,097,202		1,076,542
Investments in unconsolidated joint ventures	3,698,701		3,823,322
Deferred costs, net	170,252		177,168
Other assets	445,635		448,213
Total assets (1)	$	12,044,045	$	11,707,567
Liabilities
Mortgages and other loans payable, net	$	1,848,701	$	1,979,972
Revolving credit facility, net	625,809		105,262
Unsecured term loans, net	1,495,620		1,495,275
Unsecured notes, net	1,248,622		1,248,219
Accrued interest payable	22,796		14,825
Other liabilities	267,908		302,798
Accounts payable and accrued expenses	120,015		151,309
Deferred revenue	119,215		118,572
Lease liability - financing leases	152,622		152,521
Lease liability - operating leases	455,385		339,458
Dividend and distributions payable	24,924		149,294
Security deposits	54,181		53,836
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities	100,000		100,000
Total liabilities (1)	6,535,798		6,211,341

6

SL Green Realty Corp.

Consolidated Balance Sheets

(in thousands)

	March 31, 2021		December 31, 2020
	(unaudited)
Commitments and contingencies
Noncontrolling interests in Operating Partnership	374,124		358,262
Preferred units	198,503		202,169
Equity
SL Green stockholders' equity:
Series I Preferred Stock, $0.01 par value, $25.00 liquidation preference, 9,200 issued and outstanding at both March 31, 2021 and December 31, 2020	221,932		221,932
Common stock, $0.01 par value, 160,000 shares authorized and 70,380 and 69,534 issued and outstanding at March 31, 2021 and December 31, 2020, respectively (including 1,026 and 1,026 shares held in treasury at March 31, 2021 and December 31, 2020, respectively)	705		716
Additional paid-in-capital	3,913,258		3,862,949
Treasury stock at cost	(124,049)		(124,049)
Accumulated other comprehensive loss	(18,897)		(67,247)
Retained earnings	918,077		1,015,462
Total SL Green stockholders' equity	4,911,026		4,909,763
Noncontrolling interests in other partnerships	24,594		26,032
Total equity	4,935,620		4,935,795
Total liabilities and equity	$	12,044,045	$	11,707,567
(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: $179.6 million and $41.2 million of land, $282.3 million and $57.9 million of building and improvements, $2.0 million and $2.0 million of building and leasehold improvements, $53.2 million and $37.8 million of right of use assets, $16.4 million and $10.3 million of accumulated depreciation, $297.1 million and $289.5 million of other assets included in other line items, $368.6 million and $94.0 million of real estate debt, net, $0.9 million and $0.7 million of accrued interest payable, $45.3 million and $29.9 million of lease liabilities, and $31.2 million and $56.6 million of other liabilities included in other line items as of March 31, 2021 and December 31, 2020, respectively.

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

7

SL Green Realty Corp.

Consolidated Statements of Operations

(unaudited, in thousands, except per share data)

	Three Months Ended March 31,
	2021		2020
Revenues
Rental revenue, net	$	188,089	$	222,631
Investment income	19,273		38,533
Other income	18,740		53,139
Total revenues	226,102		314,303
Expenses
Operating expenses, including related party expenses of $2,225 in 2021 and $3,749 in 2020	42,284		53,866
Real estate taxes	45,411		46,622
Operating lease rent	6,739		7,367
Interest expense, net of interest income	23,388		37,494
Amortization of deferred financing costs	3,774		2,500
Depreciation and amortization	62,996		68,279
Loan loss and other investment reserves, net of recoveries	—		11,248
Transaction related costs	22		65
Marketing, general and administrative	22,885		19,570
Total expenses	207,499		247,011
Equity in net loss from unconsolidated joint ventures	(2,864)		(12,814)
Equity in net loss on sale of interest in unconsolidated joint venture/real estate	(12,629)		—
Purchase price and other fair value adjustments	2,664		—
(Loss) gain on sale of real estate, net	(1,388)		72,636
Depreciable real estate reserves and impairment	(8,241)		—
Net (loss) income	(3,855)		127,114
Net loss (income) attributable to noncontrolling interests:
Noncontrolling interests in the Operating Partnership	476		(6,202)
Noncontrolling interests in other partnerships	1,499		293
Preferred units distributions	(1,846)		(2,666)
Net (loss) income attributable to SL Green	(3,726)		118,539
Perpetual preferred stock dividends	(3,738)		(3,738)
Net (loss) income attributable to SL Green common stockholders	$	(7,464)	$	114,801
Basic earnings per share	$	(0.11)	$	1.51
Diluted earnings per share	$	(0.11)	$	1.51
Basic weighted average common shares outstanding	69,010		75,656
Diluted weighted average common shares and common share equivalents outstanding	74,070		80,352

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

8

SL Green Realty Corp.

Consolidated Statements of Comprehensive Income

(unaudited, in thousands)

	Three Months Ended March 31,
	2021		2020
Net (loss) income	$	(3,855)	$	127,114
Other comprehensive income (loss):
Increase (decrease) in unrealized value of derivative instruments, including SL Green's share of joint venture derivative instruments	51,263		(50,735)
Decrease in unrealized value of marketable securities	(258)		(4,534)
Other comprehensive income (loss)	51,005		(55,269)
Comprehensive income	47,150		71,845
Net loss (income) attributable to noncontrolling interests and preferred units distributions	129		(8,575)
Other comprehensive (income) loss attributable to noncontrolling interests	(2,655)		2,886
Comprehensive income attributable to SL Green	$	44,624	$	66,156

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

9

SL Green Realty Corp.

Consolidated Statements 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 Loss		Retained Earnings		Noncontrolling Interests		Total
Balance at December 31, 2020		$	221,932	68,508	$	716	$	3,862,949	$	(124,049)	$	(67,247)	$	1,015,462	$	26,032	$	4,935,795
Net loss													(3,726)		(1,499)		(5,225)
Other comprehensive income											48,350						48,350
Preferred dividends													(3,738)				(3,738)
DRSPP proceeds				5			351										351
Reallocation of noncontrolling interest in the Operating Partnership													(26,609)				(26,609)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings				113	2		6,726										6,728
Repurchases of common stock				(1,306)	(13)		(80,297)						—				(80,310)
Contributions to consolidated joint venture interests															171		171
Cash distributions to noncontrolling interests															(110)		(110)
Issuance of special dividend paid primarily in stock				2,034			123,529										123,529
Cash distributions declared ($0.910 per common share, none of which represented a return of capital for federal income tax purposes)													(63,312)				(63,312)
Balance at March 31, 2021		$	221,932	69,354	$	705	$	3,913,258	$	(124,049)	$	(18,897)	$	918,077	$	24,594	$	4,935,620

10

SL Green Realty Corp.

Consolidated Statements 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 Loss		Retained Earnings		Noncontrolling Interests		Total
Balance at December 31, 2019		$	221,932	76,956	$	803	$	4,286,395	$	(124,049)	$	(28,485)	$	1,084,719	$	75,883	$	5,517,198
Cumulative adjustment upon adoption of ASC 326													(39,184)				(39,184)
Balance at January 1, 2020		$	221,932	76,956	$	803	$	4,286,395	$	(124,049)	$	(28,485)	$	1,045,535	$	75,883	$	5,478,014
Net income (loss)													118,539		(293)		118,246
Acquisition of subsidiary interest from noncontrolling interest							(3,123)								1,587		(1,536)
Other comprehensive loss											(52,383)						(52,383)
Preferred dividends													(3,738)				(3,738)
DRSPP proceeds				2			166										166
Conversion of units in the Operating Partnership for common stock				1			84										84
Reallocation of noncontrolling interest in the Operating Partnership													38,529				38,529
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings				(32)	(1)		5,503										5,502
Repurchases of common stock				(2,562)	(26)		(142,719)						(76,831)				(219,576)
Contributions to consolidated joint venture interests															3,814		3,814
Cash distributions to noncontrolling interests															(492)		(492)
Cash distributions declared ($0.304 per common share, none of which represented a return of capital for federal income tax purposes)													(22,665)				(22,665)
Balance at March 31, 2020		$	221,932	74,365	$	776	$	4,146,306	$	(124,049)	$	(80,868)	$	1,099,369	$	80,499	$	5,343,965

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

11

SL Green Realty Corp.

Consolidated Statements of Cash Flows

(unaudited, in thousands, except per share data)

	Three Months Ended March 31,
	2021		2020
Operating Activities
Net (loss) income	$	(3,855)	$	127,114
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	66,770		70,779
Equity in net loss from unconsolidated joint ventures	2,864		12,814
Distributions of cumulative earnings from unconsolidated joint ventures	69		108
Equity in net loss on sale of interest in unconsolidated joint venture interest/real estate	12,629		—
Purchase price and other fair value adjustments	(2,664)		—
Depreciable real estate reserves and impairment	8,241		—
Loss (gain) on sale of real estate, net	1,388		(72,636)
Loan loss reserves and other investment reserves, net of recoveries	—		11,248
Deferred rents receivable	(2,685)		3,717
Non-cash lease expense	3,375		3,390
Other non-cash adjustments	15,564		1,110
Changes in operating assets and liabilities:
Tenant and other receivables	(4,138)		(44,960)
Related party receivables	(683)		(4,711)
Deferred lease costs	(240)		(8,603)
Other assets	(24,354)		(48,130)
Accounts payable, accrued expenses, other liabilities and security deposits	(38,640)		(13,877)
Deferred revenue	4,121		7,622
Lease liability - operating leases	(19,160)		(2,959)
Net cash provided by operating activities	18,602		42,026
Investing Activities
Acquisitions of real estate property	—		(86,846)
Additions to land, buildings and improvements	(49,328)		(101,726)
Investments in unconsolidated joint ventures	(21,027)		(8,906)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	19,692		53,516
Net proceeds from disposition of real estate/joint venture interest	62,800		91,156
Cash assumed from consolidation of real estate investment	9,475		—
Proceeds from sale or redemption of marketable securities	4,528		—
Other investments	(54)		(4,786)
Origination of debt and preferred equity investments	(5,905)		(223,374)
Repayments or redemption of debt and preferred equity investments	—		151,548
Net cash provided by (used in) investing activities	20,181		(129,418)

12

SL Green Realty Corp.

Consolidated Statements of Cash Flows

(unaudited, in thousands, except per share data)

	Three Months Ended March 31,
	2021		2020
Financing Activities
Proceeds from mortgages and other loans payable	10,391		101,103
Repayments of mortgages and other loans payable	(362,542)		(102,777)
Proceeds from revolving credit facility and unsecured notes	530,000		1,125,000
Repayments of revolving credit facility and unsecured notes	(10,000)		(315,000)
Proceeds from stock options exercised and DRSPP issuance	351		166
Repurchase of common stock	(84,089)		(219,576)
Redemption of preferred stock	(3,631)		(19,392)
Redemption of OP units	(13,261)		(18,066)
Distributions to noncontrolling interests in other partnerships	(110)		(492)
Contributions from noncontrolling interests in other partnerships	171		3,814
Acquisition of subsidiary interest from noncontrolling interest	—		(1,536)
Distributions to noncontrolling interests in the Operating Partnership	(4,148)		(1,284)
Dividends paid on common and preferred stock	(69,772)		(79,662)
Tax withholdings related to restricted share awards	(2,788)		(4,752)
Deferred loan costs	(288)		(562)
Principal payments of on financing lease liabilities	(255)		—
Net cash (used in) provided by financing activities	(9,971)		466,984
Net increase in cash, cash equivalents, and restricted cash	28,812		379,592
Cash, cash equivalents, and restricted cash at beginning of year	372,795		241,430
Cash, cash equivalents, and restricted cash at end of period	$	401,607	$	621,022
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Conversion of units in the Operating Partnership	$	—	$	84
Issuance of special dividend paid primarily in stock	123,529		—
Tenant improvements and capital expenditures payable	15,214		602
Fair value adjustment to noncontrolling interest in the Operating Partnership	26,609		—
Consolidation of real estate investment	119,444		—
Reversal of assets held for sale	—		391,664
Extinguishment of debt in connection with property dispositions	53,548		—
Seller financed purchases	—		100,000
Debt and preferred equity investments	10,000		4,638
Removal of fully depreciated commercial real estate properties	1,120		512
Share repurchase payable	3,779		—
Recognition of right of use assets and related lease liabilities	119,711		102,782

13

SL Green Realty Corp.

Consolidated Statements of Cash Flows

(unaudited, in thousands, except per share data)

    The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the consolidated statements of cash flows.

	Three Months Ended March 31,
	2021		2020
Cash and cash equivalents	$	304,999	$	554,195
Restricted cash	96,608		66,827
Total cash, cash equivalents, and restricted cash	$	401,607	$	621,022

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

14

SL Green Operating Partnership, L.P.

Consolidated Balance Sheets

(in thousands)

	March 31, 2021		December 31, 2020
	(unaudited)
Assets
Commercial real estate properties, at cost:
Land and land interests	$	1,445,199	$	1,315,832
Building and improvements	4,096,930		4,168,193
Building leasehold and improvements	1,730,418		1,448,134
Right of use asset - financing leases	55,711		55,711
Right of use asset - operating leases	502,316		367,209
	7,830,574		7,355,079
Less: accumulated depreciation	(2,004,945)		(1,956,077)
	5,825,629		5,399,002
Cash and cash equivalents	304,999		266,059
Restricted cash	96,608		106,736
Investments in marketable securities	23,784		28,570
Tenant and other receivables	42,505		44,507
Related party receivables	34,310		34,657
Deferred rents receivable	304,420		302,791
Debt and preferred equity investments, net of discounts and deferred origination fees of $9,817 and $11,232 and allowances of $13,213 and $13,213 in 2021 and 2020, respectively	1,097,202		1,076,542
Investments in unconsolidated joint ventures	3,698,701		3,823,322
Deferred costs, net	170,252		177,168
Other assets	445,635		448,213
Total assets (1)	$	12,044,045	$	11,707,567
Liabilities
Mortgages and other loans payable, net	$	1,848,701	$	1,979,972
Revolving credit facility, net	625,809		105,262
Unsecured term loans, net	1,495,620		1,495,275
Unsecured notes, net	1,248,622		1,248,219
Accrued interest payable	22,796		14,825
Other liabilities	267,908		302,798
Accounts payable and accrued expenses	120,015		151,309
Deferred revenue	119,215		118,572
Lease liability - financing leases	152,622		152,521
Lease liability - operating leases	455,385		339,458
Dividend and distributions payable	24,924		149,294
Security deposits	54,181		53,836
Liabilities related to assets held for sale	—		—
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities	100,000		100,000
Total liabilities (1)	6,535,798		6,211,341
Commitments and contingencies
Limited partner interests in SLGOP (4,156 and 3,939 limited partner common units outstanding at March 31, 2021 and December 31, 2020, respectively)	374,124		358,262
Preferred units	198,503		202,169

15

SL Green Operating Partnership, L.P.

Consolidated Balance Sheets

(in thousands)

	March 31, 2021		December 31, 2020
	(unaudited)
Capital
SLGOP partners' capital:
Series I Preferred Units, $25.00 liquidation preference, 9,200 issued and outstanding at both March 31, 2021 and December 31, 2020	221,932		221,932
SL Green partners' capital (735 and 724 general partner common units and 68,619 and 67,784 limited partner common units outstanding at March 31, 2021 and December 31, 2020, respectively)	4,707,991		4,755,078
Accumulated other comprehensive loss	(18,897)		(67,247)
Total SLGOP partners' capital	4,911,026		4,909,763
Noncontrolling interests in other partnerships	24,594		26,032
Total capital	4,935,620		4,935,795
Total liabilities and capital	$	12,044,045	$	11,707,567
(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, excluding the Operating Partnership: $179.6 million and $41.2 million of land, $282.3 million and $57.9 million of building and improvements, $2.0 million and $2.0 million of building and leasehold improvements, $53.2 million and $37.8 million of right of use assets, $16.4 million and $10.3 million of accumulated depreciation, $297.1 million and $289.5 million of other assets included in other line items, $368.6 million and $94.0 million of real estate debt, net, $0.9 million and $0.7 million of accrued interest payable, $45.3 million and $29.9 million of lease liabilities, and $31.2 million and $56.6 million of other liabilities included in other line items as of March 31, 2021 and December 31, 2020, respectively.

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

16

SL Green Operating Partnership, L.P.

Consolidated Statements of Operations

(unaudited, in thousands, except per unit data)

	Three Months Ended March 31,
	2021		2020
Revenues
Rental revenue, net	$	188,089	$	222,631
Investment income	19,273		38,533
Other income	18,740		53,139
Total revenues	226,102		314,303
Expenses
Operating expenses, including related party expenses of $2,225 in 2021 and $3,749 in 2020	42,284		53,866
Real estate taxes	45,411		46,622
Operating lease rent	6,739		7,367
Interest expense, net of interest income	23,388		37,494
Amortization of deferred financing costs	3,774		2,500
Depreciation and amortization	62,996		68,279
Loan loss and other investment reserves, net of recoveries	—		11,248
Transaction related costs	22		65
Marketing, general and administrative	22,885		19,570
Total expenses	207,499		247,011
Equity in net loss from unconsolidated joint ventures	(2,864)		(12,814)
Equity in net loss on sale of interest in unconsolidated joint venture/real estate	(12,629)		—
Purchase price and other fair value adjustments	2,664		—
(Loss) gain on sale of real estate, net	(1,388)		72,636
Depreciable real estate reserves and impairment	(8,241)		—
Net (loss) income	(3,855)		127,114
Net loss (income) attributable to noncontrolling interests:
Noncontrolling interests in other partnerships	1,499		293
Preferred units distributions	(1,846)		(2,666)
Net (loss) income attributable to SLGOP	(4,202)		124,741
Perpetual preferred unit distributions	(3,738)		(3,738)
Net (loss) income attributable to SLGOP common unitholders	$	(7,940)	$	121,003
Basic earnings per unit	$	(0.11)	$	1.51
Diluted earnings per unit	$	(0.11)	$	1.51
Basic weighted average common units outstanding	73,158		79,876
Diluted weighted average common units and common unit equivalents outstanding	74,070		80,352

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

17

SL Green Operating Partnership, L.P.

Consolidated Statements of Comprehensive Income

(unaudited, in thousands)

	Three Months Ended March 31,
	2021		2020
Net (loss) income	$	(3,855)	$	127,114
Other comprehensive income (loss):
Increase (decrease) in unrealized value of derivative instruments, including SLGOP's share of joint venture derivative instruments	51,263		(50,735)
Decrease in unrealized value of marketable securities	(258)		(4,534)
Other comprehensive income (loss)	51,005		(55,269)
Comprehensive income	47,150		71,845
Net loss attributable to noncontrolling interests	1,499		293
Other comprehensive (income) loss attributable to noncontrolling interests	(2,655)		2,886
Comprehensive income attributable to SLGOP	$	45,994	$	75,024

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

18

SL Green Operating Partnership, L.P.

Consolidated Statements 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 Loss		Noncontrolling Interests		Total
Balance at December 31, 2020	$	221,932	68,508	$	4,755,078	$	(67,247)	$	26,032	$	4,935,795
Net loss				(3,726)				(1,499)		(5,225)
Other comprehensive loss						48,350				48,350
Preferred distributions				(3,738)						(3,738)
DRSPP proceeds			5	351						351
Reallocation of noncontrolling interests in the operating partnership				(26,609)						(26,609)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings			113	6,728						6,728
Repurchases of common units			(1,306)	(80,310)						(80,310)
Contribution to consolidated joint venture interests								171		171
Cash distributions to noncontrolling interests								(110)		(110)
Issuance of special distribution paid primarily in units			2,034	123,529						123,529
Cash distributions declared ($0.910 per common unit, none of which represented a return of capital for federal income tax purposes)				(63,312)						(63,312)
Balance at March 31, 2021	$	221,932	69,354	$	4,707,991	$	(18,897)	$	24,594	$	4,935,620

19

SL Green Operating Partnership, L.P.

Consolidated Statements 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 Loss		Noncontrolling Interests		Total
Balance at December 31, 2019	$	221,932	76,956	$	5,247,868	$	(28,485)	$	75,883	$	5,517,198
Cumulative adjustment upon adoption of ASC 326				(39,184)						(39,184)
Balance at January 1, 2020	$	221,932	76,956	$	5,208,684	$	(28,485)	$	75,883	$	5,478,014
Net income (loss)				118,539				(293)		118,246
Acquisition of subsidiary interest from noncontrolling interest				(3,123)				1,587		(1,536)
Other comprehensive income						(52,383)				(52,383)
Preferred distributions				(3,738)						(3,738)
DRSPP proceeds			2	166						166
Conversion of common units			1	84						84
Reallocation of noncontrolling interests in the operating partnership				38,529						38,529
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings			(32)	5,502						5,502
Repurchases of common stock			(2,562)	(219,576)						(219,576)
Contribution to consolidated joint venture interests								3,814		3,814
Cash distributions to noncontrolling interests								(492)		(492)
Cash distributions declared ($0.304 per common unit, none of which represented a return of capital for federal income tax purposes)				(22,665)						(22,665)
Balance at March 31, 2020	$	221,932	74,365	$	5,122,402	$	(80,868)	$	80,499	$	5,343,965

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

20

SL Green Operating Partnership, L.P.

Consolidated Statements of Cash Flows

(unaudited, in thousands)

	Three Months Ended March 31,
	2021		2020
Operating Activities
Net (loss) income	$	(3,855)	$	127,114
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	66,770		70,779
Equity in net loss from unconsolidated joint ventures	2,864		12,814
Distributions of cumulative earnings from unconsolidated joint ventures	69		108
Equity in net loss on sale of interest in unconsolidated joint venture interest/real estate	12,629		—
Purchase price and other fair value adjustments	(2,664)		—
Depreciable real estate reserves and impairment	8,241		—
Loss (gain) on sale of real estate, net	1,388		(72,636)
Loan loss reserves and other investment reserves, net of recoveries	—		11,248
Deferred rents receivable	(2,685)		3,717
Non-cash lease expense	3,375		3,390
Other non-cash adjustments	15,564		1,110
Changes in operating assets and liabilities:
Tenant and other receivables	(4,138)		(44,960)
Related party receivables	(683)		(4,711)
Deferred lease costs	(240)		(8,603)
Other assets	(24,354)		(48,130)
Accounts payable, accrued expenses, other liabilities and security deposits	(38,640)		(13,877)
Deferred revenue	4,121		7,622
Lease liability - operating leases	(19,160)		(2,959)
Net cash provided by operating activities	18,602		42,026
Investing Activities
Acquisitions of real estate property	—		(86,846)
Additions to land, buildings and improvements	(49,328)		(101,726)
Investments in unconsolidated joint ventures	(21,027)		(8,906)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	19,692		53,516
Net proceeds from disposition of real estate/joint venture interest	62,800		91,156
Cash assumed from consolidation of real estate investment	9,475		—
Proceeds from sale or redemption of marketable securities	4,528		—
Other investments	(54)		(4,786)
Origination of debt and preferred equity investments	(5,905)		(223,374)
Repayments or redemption of debt and preferred equity investments	—		151,548
Net cash provided by (used in) investing activities	20,181		(129,418)

21

SL Green Operating Partnership, L.P.

Consolidated Statements of Cash Flows

(unaudited, in thousands)

	Three Months Ended March 31,
	2021		2020
Financing Activities
Proceeds from mortgages and other loans payable	10,391		101,103
Repayments of mortgages and other loans payable	(362,542)		(102,777)
Proceeds from revolving credit facility and unsecured notes	530,000		1,125,000
Repayments of revolving credit facility and unsecured notes	(10,000)		(315,000)
Proceeds from stock options exercised and DRSPP issuance	351		166
Repurchase of common units	(84,089)		(219,576)
Redemption of preferred units	(3,631)		(19,392)
Redemption of OP units	(13,261)		(18,066)
Distributions to noncontrolling interests in other partnerships	(110)		(492)
Contributions from noncontrolling interests in other partnerships	171		3,814
Acquisition of subsidiary interest from noncontrolling interest	—		(1,536)
Distributions paid on common and preferred units	(73,920)		(80,946)
Tax withholdings related to restricted share awards	(2,788)		(4,752)
Deferred loan costs	(288)		(562)
Principal payments of on financing lease liabilities	(255)		—
Net cash (used in) provided by financing activities	(9,971)		466,984
Net increase in cash, cash equivalents, and restricted cash	28,812		379,592
Cash, cash equivalents, and restricted cash at beginning of year	372,795		241,430
Cash, cash equivalents, and restricted cash at end of period	$	401,607	$	621,022
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Conversion of units in the Operating Partnership	$	—	$	84
Issuance of special distribution paid primarily in units	123,529		—
Tenant improvements and capital expenditures payable	15,214		602
Fair value adjustment to noncontrolling interest in the Operating Partnership	26,609		—
Consolidation of real estate investment	119,444		—
Reversal of assets held for sale	—		391,664
Extinguishment of debt in connection with property dispositions	53,548		—
Seller financed purchases	—		100,000
Debt and preferred equity investments	10,000		4,638
Removal of fully depreciated commercial real estate properties	1,120		512
Share repurchase payable	3,779		—
Recognition of right of use assets and related lease liabilities	119,711		102,782

    The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the consolidated statements of cash flows.

	Three Months Ended March 31,
	2021		2020
Cash and cash equivalents	$	304,999	$	554,195
Restricted cash	96,608		66,827
Total cash, cash equivalents, and restricted cash	$	401,607	$	621,022

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

22

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

Notes to Consolidated Financial Statements

March 31, 2021

(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 March 31, 2021, noncontrolling investors held, in the aggregate, a 5.65% 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."

On December 4, 2020 our Board of Directors declared an ordinary dividend and a special dividend (together, "the Total Dividend"). The Total Dividend was paid on January 15, 2021 to shareholders of record at the close of business on December 15, 2020 ("the Record Date"). Shareholders had the opportunity to elect to receive the Total Dividend in the form of all cash or all stock, subject to proration if either option was oversubscribed. As a result of the elections made, the cash option was oversubscribed and was prorated. Shareholders who elected to receive cash received, for each share of common stock they owned as of the Record Date, approximately $0.3735 in cash and 0.0279 shares of common stock. Shareholders who elected to receive shares received, for each share of common stock they owned as of the Record Date, approximately 0.0343 shares of common stock. The number of shares issued was calculated based on the volume weighted average trading price of SLG's common stock between January 5-7, 2021, of $58.15 per share.

To mitigate the dilutive impact of the common stock issued in the special dividend, the board of directors also authorized a reverse stock split, which was effective after markets closed on January 20, 2021. On January 8, 2021, a committee of the Board of Directors calculated the ratio for the reverse stock split of our issued and outstanding shares of common stock as 1.02918-for-1. After the issuance of the dividend and the completion of the reverse stock split, the number of shares of our common stock outstanding was equivalent to the number of total shares outstanding on the Record Date (not including any issuances or repurchases that occurred following the Record Date, as well as any fractional shares that would have been issued but for which cash-in-lieu was paid). However, on a relative basis, some individual shareholders may have more shares of SLG’s common stock, and some individual shareholders may have fewer shares of our common stock, depending on their individual elections to receive cash or stock and as a result of the cash option being oversubscribed.

All share-related references and measurements including the number of shares outstanding, share prices, number of shares repurchased, earnings per share, dividends per share, and share-based compensation awards, have been retroactively adjusted to reflect the reverse stock split for all periods presented in this Quarterly Report on Form 10-Q.

23

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

As of March 31, 2021, we owned the following interests in properties in the New York metropolitan area, primarily in midtown Manhattan. Our investments located outside of Manhattan are referred to as the Suburban properties:

		Consolidated		Unconsolidated		Total
Location	Property Type	Number of Buildings	Approximate Square Feet (unaudited)	Number of Buildings	Approximate Square Feet (unaudited)	Number of Buildings	Approximate Square Feet (unaudited)	Weighted Average Occupancy(1) (unaudited)
Commercial:
Manhattan	Office	18	10,526,345	9	10,869,183	27	21,395,528	93.4	%
	Retail	1	10,040	9	301,996	10	312,036	94.6	%
	Development/Redevelopment	9	1,890,614	3	2,927,782	12	4,818,396	N/A
		28	12,426,999	21	14,098,961	49	26,525,960	93.5	%
Suburban	Office	7	862,800	—	—	7	862,800	81.6	%
Total commercial properties		35	13,289,799	21	14,098,961	56	27,388,760	93.0	%
Residential:
Manhattan	Residential	1	82,250	8	1,663,774	9	1,746,024	79.1	%
Total portfolio		36	13,372,049	29	15,762,735	65	29,134,784	92.2	%

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

As of March 31, 2021, we also managed two office buildings owned by third parties encompassing approximately 2.1 million square feet (unaudited), and held debt and preferred equity investments with a book value of $1.1 billion, excluding $0.1 billion of debt and preferred equity investments and other financing receivables that are included in 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, subject to the priority distributions with respect to preferred units and special provisions that apply to LTIP Units. 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 March 31, 2021 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, 2021. 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, 2020 of the Company and the Operating Partnership.

The consolidated balance sheet at December 31, 2020 has been derived from the audited financial statements as of that date but does not include all the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

24

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

Subsequent Events

In April 2021, the Company exercised its option to acquire the fee interest in 461 Fifth Avenue from the ground lessor of the property for a purchase price of $28.0 million. At March 31, 2021, the Company held the leasehold interest in the property. The transaction is expected to close in the second quarter of 2021.

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 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

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 3 years 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 1 year to 15 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 1 year to 15 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 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.

The Company classifies those leases under which the Company is the lessee at lease commencement as finance or operating leases. Leases qualify as finance leases if the lease transfers ownership of the asset at the end of the lease term, the lease grants an option to purchase the asset that we are reasonably certain to exercise, the lease term is for a major part of the remaining economic life of the asset, or the present value of the lease payments exceeds substantially all of the fair value of the asset. Leases that do not qualify as finance leases are deemed to be operating leases. At lease commencement the Company records a lease liability which is measured as the present value of the lease payments and a right of use asset which is measured as the amount of the lease liability and any initial direct costs incurred. The Company applies a discount rate to determine the present value of the lease payments. If the rate implicit in the lease is known, the Company uses that rate. If the rate implicit in the lease is not known, the Company uses a discount rate reflective of the Company’s collateralized borrowing rate given the term of the lease. To determine the discount rate, the Company employs a third party specialist to develop an analysis based primarily on the observable borrowing rates of the Company, other REITs, and other corporate borrowers with long-term borrowings. On the consolidated statements of operations, operating leases are expensed through operating lease rent while financing leases are expensed through amortization and interest expense. On the consolidated balance sheets, financing leases include the amounts previously captioned "Properties under capital lease." When applicable, the Company combines the consideration for lease and non-lease components in the calculation of the value of the lease obligation and right-of-use asset.

On a periodic basis, we assess whether there are any indications that the value of our real estate properties may be 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 fair value of the property as calculated in accordance with Accounting Standards Codification, or ASC 820. We also

25

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

evaluate our real estate properties for impairment when a property has been classified as held for sale. Real estate assets held for sale are valued at the lower of their carrying value or fair value less costs to sell and depreciation expense is no longer recorded.

For the three months ended March 31, 2021, we recognized ($1.9 million) of rental revenue for the amortization of aggregate above-market leases in excess of below-market leases resulting from the allocation of the purchase price of the applicable properties. For the three months ended March 31, 2020 , we recognized $1.2 million of rental revenue for the amortization of aggregate below-market leases in excess of above-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 March 31, 2021 and December 31, 2020 (in thousands):

	March 31, 2021		December 31, 2020
Identified intangible assets (included in other assets):
Gross amount	$	239,562	$	215,673
Accumulated amortization	(204,386)		(190,523)
Net(1)	$	35,176	$	25,150
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	242,334	$	241,409
Accumulated amortization	(233,766)		(230,479)
Net(1)	$	8,568	$	10,930

(1) As of March 31, 2021 and December 31, 2020, no net intangible assets and no net intangible liabilities were reclassified to assets held for sale or liabilities related to assets held for sale.

Cash and Cash Equivalents

We consider all highly liquid investments with maturity of three months or less when purchased to be cash equivalents.

Restricted Cash

Restricted cash primarily consists of security deposits held on behalf of our tenants, interest reserves, as well as capital improvement and real estate tax escrows required under certain loan agreements.

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 March 31, 2021, 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 ASC 820-10, with the net unrealized gains or losses reported as a component of accumulated other comprehensive income or loss. The cost of marketable securities sold and the amount reclassified out of accumulated other comprehensive income into earnings is determined using the specific identification method. Credit losses are recognized in accordance with ASC 326.

At March 31, 2021 and December 31, 2020, we held the following marketable securities (in thousands):

	March 31, 2021		December 31, 2020
Commercial mortgage-backed securities	$	23,784	$	28,570
Total marketable securities available-for-sale	$	23,784	$	28,570

26

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

The cost basis of the commercial mortgage-backed securities was $23.0 million and $27.5 million at March 31, 2021 and December 31, 2020, respectively. These securities mature at various times through 2035. All securities were in an unrealized gain position at March 31, 2021 and December 31, 2020 except for one security, which had an unrealized loss of $0.7 million and a fair market value of $7.1 million at March 31, 2021, and an unrealized loss of $0.7 million and a fair value of $7.0 million at December 31, 2020. This marketable security had been in a continuous unrealized loss position for more than 12 months at March 31, 2021 and less than 12 months at December 31, 2020. 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.

We held no equity marketable securities as of March 31, 2021 and December 31, 2020.

During the three months ended March 31, 2021, we received aggregate net proceeds of $5.0 million from the repayment of one marketable security. We did not dispose of further marketable securities during three months ended March 31, 2021. During the three months ended March 31, 2020, we did not dispose of or receive repayment of any further marketable securities.

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 each joint ventures' actual and projected cash flows. We do not believe that the values of any of our equity investments were impaired at March 31, 2021.

Deferred Lease Costs

Deferred lease costs consist of incremental fees and direct costs that would not have been incurred if the lease had not been obtained and are amortized on a straight-line basis over the related lease term.

Lease Classification

Lease classification for leases under which the Company is the lessor is evaluated at lease commencement and leases not classified as sales-type leases or direct financing leases are classified as operating leases. Leases qualify as sales-type leases if the contract includes either transfer of ownership clauses, certain purchase options, a lease term representing a major part of the economic life of the asset, or the present value of the lease payments and residual guarantees provided by the lessee exceeds substantially all of the fair value of the asset. Additionally, leasing an asset so specialized that it is not deemed to have any value to the Company at the end of the lease term may also result in classification as a sales-type lease. Leases qualify as direct financing leases when the present value of the lease payments and residual value guarantees provided by the lessee and unrelated third parties exceeds substantially all of the fair value of the asset and collection of the payments is probable.

Revenue Recognition

Rental revenue for operating leases is recognized on a straight-line basis over the term of the lease. Rental revenue recognition commences when the leased space is available for its intended use by the lessee.

To determine whether the leased space is available for its intended use by the lessee, management evaluates whether we are the owner of tenant improvements for accounting purposes or if the tenant is. When management concludes that we are the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of the finished space, which is when such tenant improvements are substantially complete. In certain instances, when management concludes that we are not the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of or controls the space.

When management concludes that we are the owner of tenant improvements for accounting purposes, we record amounts funded to construct the tenant improvements as a capital asset. For these tenant improvements, we record amounts reimbursed by tenants as a reduction of the capital asset. When management concludes that the tenant is the owner of tenant improvements for accounting purposes, we record our contribution towards those improvements as a lease incentive, which is included in deferred costs, net on our consolidated balance sheets and amortized as a reduction to rental revenue on a straight-line basis over the term of the lease.

The excess of rents recognized over amounts contractually due pursuant to the underlying leases are included in deferred rents receivable on the consolidated balance sheets.

In addition to base rent, our tenants also generally will pay variable rent which represents their pro rata share of increases in real estate taxes and certain operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in certain building operating expenses, the tenant will pay additional rent based upon increases in the

27

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

wage rate paid to porters over the porters' wage rate in effect during a base year or increases in the consumer price index over the index value in effect during a base year. In addition, many of our leases contain fixed percentage increases over the base rent to cover escalations. Electricity is most often supplied by the landlord either on a sub-metered basis, or rent inclusion basis (i.e., a fixed fee is included in the rent for electricity, which amount may increase based upon increases in electricity rates or increases in electrical usage by the tenant). Base building services other than electricity (such as heat, air conditioning and freight elevator service during business hours, and base building cleaning) are typically provided at no additional cost, with the tenant paying additional rent only for services which exceed base building services or for services which are provided outside normal business hours. These escalations are based on actual expenses incurred in the prior calendar year. If the expenses in the current year are different from those in the prior year, then during the current year, the escalations will be adjusted to reflect the actual expenses for the current year.

Rental revenue is recognized if collectability is probable. If collectability of substantially all of the lease payments is assessed as not probable, any difference between the rental revenue recognized to date and the lease payments that have been collected is recognized as a current-period adjustment to rental revenue. A subsequent change in the assessment of collectability to probable may result in a current-period adjustment to rental revenue for any difference between the rental revenue that would have been recognized if collectability had always been assessed as probable and the rental revenue recognized to date.

We recognize lease concessions related to COVID-19, such as rent deferrals and abatements, in accordance with the Lease Modification Q&A issued by the FASB in April 2020, which provides entities with the option to elect to account for lease concessions as though the enforceable rights and obligations existed in the original lease. This election is only available when total cash flows resulting from the modified lease are substantially similar to the cash flows in the original lease. When total cash flows resulting from the modified lease are not substantially similar to the cash flows in the original lease, we account for the concession agreement as a new lease.

The Company provides its tenants with certain customary services for lease contracts such as common area maintenance and general security. We have elected to combine the non-lease components with the lease components of our operating lease agreements and account for them as a single lease component in accordance with ASC 842.

We record a gain or loss on sale of real estate assets when we no longer have a controlling financial interest in the entity owning the real estate, a contract exists with a third party and that third party has control of the assets acquired.

Investment income on debt and preferred equity investments is accrued based on the contractual terms of the instruments and when it is deemed collectible. Some debt and preferred equity investments provide for accrual of interest at specified rates, which differ from current payment terms. Interest is recognized on such loans at the accrual rate subject to management's determination that accrued interest is collectible. If management cannot make this determination, interest income above the current pay rate is recognized only upon actual receipt.

Deferred origination fees, original issue discounts and loan origination costs, if any, are recognized as an adjustment to interest income over the terms of the related investments using the effective interest method. Fees received in connection with loan commitments are also deferred until the loan is funded and are then recognized over the term of the loan as an adjustment to yield. Discounts or premiums associated with the purchase of loans are amortized or accreted into interest income as a yield adjustment on the effective interest method based on expected cash flows through the expected maturity date of the related investment. If we purchase a debt or preferred equity investment at a discount, intend to hold it until maturity and expect to recover the full value of the investment, we accrete the discount into income as an adjustment to yield over the term of the investment. If we purchase a debt or preferred equity investment at a discount with the intention of foreclosing on the collateral, we do not accrete the discount. For debt investments acquired at a discount for credit quality, the difference between contractual cash flows and expected cash flows at acquisition is not accreted. Anticipated exit fees, the collection of which is expected, are also recognized over the term of the loan as an adjustment to yield.

We consider a debt and preferred equity investment to be past due when amounts contractually due have not been paid. Debt and preferred equity investments are placed on a non-accrual status at the earlier of the date at which payments become 90 days past due or when, in the opinion of management, a full recovery of interest income becomes doubtful. Interest income recognition is resumed on any debt or preferred equity investment that is on non-accrual status when such debt or preferred equity investment becomes contractually current and performance is demonstrated to be resumed.

We may syndicate a portion of the loans that we originate or sell the loans individually. When a transaction meets the criteria for sale accounting, we recognize gain or loss based on the difference between the sales price and the carrying value of the loan sold. Any related unamortized deferred origination fees, original issue discounts, loan origination costs, discounts or premiums at the time of sale are recognized as an adjustment to the gain or loss on sale, which is included in investment income

28

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

on the consolidated statement of operations. Any fees received at the time of sale or syndication are recognized as part of investment income.

Asset management fees are recognized on a straight-line basis over the term of the asset management agreement.

Debt and Preferred Equity Investments

Debt and preferred equity investments are presented at the net amount expected to be collected in accordance with ASC 326. An allowance for loan losses is deducted from the amortized cost basis of the financial assets to present the net carrying value at the amount expected to be collected through the expected maturity date of such investments. The expense for loan loss and other investment reserves is the charge to earnings to adjust the allowance for loan losses to the appropriate level. Amounts are written off from the allowance when we de-recognize the related investment either as a result of a sale of the investment or acquisition of equity interests in the collateral.

The Company evaluates the amount expected to be collected based on current market and economic conditions, historical loss information, and reasonable and supportable forecasts. The Company's assumptions are derived from both internal data and external data which may include, among others, governmental economic projections for the New York City Metropolitan area, public data on recent transactions and filings for securitized debt instruments. This information is aggregated by asset class and adjusted for duration. Based on these inputs, loans are evaluated at the individual asset level. In certain instances, we may also use a probability-weighted model that considers the likelihood of multiple outcomes and the amount expected to be collected for each outcome.

The evaluation of the possible credit deterioration associated with the performance and/or value of the underlying collateral property as well as the financial and operating capability of the borrower/sponsor requires significant judgment, which include both asset level and market assumptions over the relevant time period.

In addition, quarterly, the Company assigns each loan a risk rating. Based on a 3-point scale, loans are rated “1” through “3,” from lower risk to higher risk, which ratings are defined as follows: 1 - Low Risk Assets - Low probability of loss, 2 - Watch List Assets - Higher potential for loss, 3 - High Risk Assets - Loss more likely than not. Loans with risk ratings of 2 or above are evaluated to determine whether the expected risk of loss is appropriately captured through the combination of our expectations of current conditions, historical loss information and supportable forecasts described above or whether risk characteristics specific to the loan warrant the use of a probability-weighted model.

Financing investments that are classified as held for sale are carried at the expected amount to be collected or fair market value using available market information obtained through consultation with dealers or other originators of such investments as well as discounted cash flow models based on Level 3 data pursuant to ASC 820-10. As circumstances change, management may conclude not to sell an investment designated as held for sale. In such situations, the investment will be reclassified at its expected amount to be collected.

Other financing receivables that are included in balance sheet line items other than the Debt and Preferred Equity Investments line are also measured at the net amount expected to be collected.

Accrued interest receivable amounts related to these debt and preferred equity investment and other financing receivables are recorded at the net amount expected to be collected within Other assets in the consolidated balance sheets. Accrued interest receivables that are written off are recognized as an expense in loan loss and other investment reserves.

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 its 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 its 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.

We have elected, and may elect in the future, to treat certain of our 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

29

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

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 months ended March 31, 2021, we recorded a Federal, state and local tax provision of $0.7 million. During the three months ended March 31, 2020, we recorded a Federal, state and local provision of $1.1 million.

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 initial and ongoing evaluations of the credit quality 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 potential source of funds to offset the economic costs associated with lost revenue from that tenant and the costs associated with re-tenanting a space. The properties in our real estate portfolio are located in the New York metropolitan area. The tenants located in our buildings operate in various industries. Other than one tenant, Viacom CBS Inc., which accounts for 5.9% 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 March 31, 2021.

For the three months ended March 31, 2021, the following properties contributed more than 5.0% of our annualized cash rent from office properties, including our share of annualized cash rent from joint venture office properties:

Property	Three months ended March 31, 2021
11 Madison Avenue	9.2%
420 Lexington Avenue (Graybar)	7.2%
1185 Avenue of the Americas	7.1%
1515 Broadway	6.9%
220 East 42nd Street	6.2%
280 Park Avenue	5.8%
485 Lexington Avenue	5.1%

Reclassification

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

30

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

Accounting Standards Updates

In August 2020, the FASB issued Accounting Standard Update, or "ASU," No. 2020-06 Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40). ASU 2020-06 simplifies the accounting for convertible instruments by reducing the number of accounting models for convertible debt instruments and convertible preferred stock, removes certain settlement conditions that are required for equity contracts to qualify for the derivative scope exception and also simplifies the diluted earnings per share calculation in certain areas. ASU 2020-06 is effective for reporting periods beginning after December 15, 2021, with early adoption permitted. We are currently evaluating the impact of the adoption of ASU 2020-06 on our consolidated financial statements, but do not believe the adoption of this standard will have a material impact on our consolidated financial statements.

In March 2020, the FASB issued ASU No. 2020-04 Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting and then in January 2021, the FASB issued ASU No. 2021-01. The amendments provide practical expedients for reference rate reform related activities that impact debt, leases, derivatives and other contracts. The guidance is optional and is effective between March 12, 2020 and December 31, 2022. The guidance may be elected over time as reference rate reform activities occur. During the first quarter of 2020, the Company elected to apply the hedge accounting expedients related to probability and the assessments of effectiveness for future LIBOR-indexed cash flows to assume that the index upon which future hedged transactions will be based matches the index on the corresponding derivatives. Application of these expedients preserves the presentation of derivatives consistent with past presentation. The Company continues to evaluate the impact of the guidance and may apply other elections as applicable as additional changes in the market occur.

3. Property Acquisitions

The following table summarizes the properties acquired during the three months ended March 31, 2021:

Property	Acquisition Date	Property Type	Approximate Square Feet	Gross Asset Valuation (in millions)
885 Third Avenue (1)	January 2021	Fee Interest	625,000	$	387.9

(1)In January 2021, pursuant to the partnership documents of our 885 Third Avenue investment, certain participating rights of the common member expired. As a result, it was determined that this investment is a VIE of which we are the primary beneficiary, and the investment was consolidated in our financial statements. Upon consolidating the entity, the assets and liabilities of the entity were recorded at fair value. Prior to January 2021, the investment was accounted for under the equity method. See Note 6, "Investments in Unconsolidated Joint Ventures" and Note 16, "Fair Value Measurements."

4. Properties Held for Sale and Property Dispositions

Properties Held for Sale

As of March 31, 2021, no properties were classified as held for sale.

Property Dispositions

The following table summarizes the properties disposed of during the three months ended March 31, 2021:

Property	Disposition Date	Property Type	Approximate Square Feet	Gross Asset Valuation (in millions)		(Loss) Gain (in millions)
712 Madison Avenue (1)	January 2021	Fee Interest	6,600	$	43.0	$	(1.4)
133 Greene Street (2)	February 2021	Fee Interest	6,425	15.8		0.2
106 Spring Street (2)	March 2021	Fee Interest	5,928	35.0		(2.8)

(1)Disposition resulted from the buyer exercising its purchase option under a ground lease arrangement.

(2)In the first quarter of 2021, the property was foreclosed on by the lender in conjunction with the related debt extinguishment.

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

5. Debt and Preferred Equity Investments

Below is a summary of the activity in our debt and preferred equity investments for the three months ended March 31, 2021 and the twelve months ended December 31, 2020 (in thousands):

	March 31, 2021		December 31, 2020
Balance at beginning of year (1)	$	1,076,542	$	1,580,306
Debt investment originations/fundings/accretion (2)	17,465		389,300
Preferred equity investment originations/accretion (2)	3,195		167,042
Redemptions/sales/syndications/equity ownership/amortization (3)	—		(1,048,643)
Net change in loan loss reserves	—		(11,463)
Balance at end of period (1)	$	1,097,202	$	1,076,542

(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, but did not meet the conditions for sale accounting, are included in Other assets and Other liabilities on the consolidated balance sheets.

Below is a summary of our debt and preferred equity investments as of March 31, 2021 (dollars in thousands):

	Floating Rate					Fixed Rate					Total Carrying Value		Senior Financing		Weighted Average Yield at End of Period	Maturity (1)
Type	Carrying Value		Face Value		Interest Rate	Carrying Value		Face Value		Interest Rate
Senior Mortgage Debt	$	64,042	$	64,649	L + 2.00% - 3.50%	$	1,249	$	1,250	3.50%	$	65,291	$	—	4.74%	2021 - 2022
Junior Mortgage Debt	7,207		12,000		L + 7.25%	42,819		43,000		6.25%	50,026		127,000		7.82%	2021
Mezzanine Debt	281,401		285,179		L + 4.95% - 13.61%	437,503		449,102		2.90% - 14.30%	718,904		4,476,210		5.86%	2021 - 2029
Preferred Equity	—		—		—	262,981		265,052		6.50% - 11.00%	262,981		1,962,750		9.94%	2022 - 2027
Balance at end of period	$	352,650	$	361,828		$	744,552	$	758,404		$	1,097,202	$	6,565,960

(1)Excludes available extension options to the extent they have not been exercised as of the date of this filing.

The following table is a rollforward of our total allowance for loan losses for the three months ended March 31, 2021 and the twelve months ended December 31, 2020 (in thousands):

	March 31, 2021		December 31, 2020
Balance at beginning of year	$	13,213	$	1,750
Cumulative adjustment upon adoption of ASC 326	—		27,803
Current period provision for loan loss	—		20,693
Write-offs charged against the allowance(1)	—		(37,033)
Balance at end of period(2)	$	13,213	$	13,213

(1)Includes $19.0 million of charges recorded against investments that were sold during the year ended December 31, 2020. These charges are included in loan loss and other investment reserves, net of recoveries, in our consolidated statements of operations for the year ended December 31, 2020.

(2)As of March 31, 2021, we had recorded an allowance for loan loss on all financing receivables on non-accrual except for one debt investment with a carrying value of $225.4 million.

At March 31, 2021 and December 31, 2020, all debt and preferred equity investments were performing in accordance with their respective terms, with the exception of one investment with a carrying value, net of reserves, of $6.8 million, as discussed in the Debt Investments table further below.

No other financing receivables were 90 days past due at March 31, 2021 and December 31, 2020 with the exception of a $27.7 million financing receivable which was put on nonaccrual in August 2018 as a result of interest default.

32

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

The following table sets forth the carrying value of our debt and preferred equity investment portfolio by risk rating as of March 31, 2021 and December 31, 2020 (dollars in thousands):

Risk Rating	March 31, 2021		December 31, 2020
1 - Low Risk Assets - Low probability of loss	$	712,994	$	695,035
2 - Watch List Assets - Higher potential for loss	367,859		365,167
3 - High Risk Assets - Loss more likely than not	16,349		16,340
	$	1,097,202	$	1,076,542

The following table sets forth the carrying value of our debt and preferred equity investment portfolio by year of origination and risk rating as of March 31, 2021 (dollars in thousands):

	As of March 31, 2021
Risk Rating	2021(1)		2020(1)		2019(1)		Prior(1)		Total
1 - Low Risk Assets - Low probability of loss	$	—	$	361,444	$	56,639	$	294,911	$	712,994
2 - Watch List Assets - Higher potential for loss	—		—		241,285		126,574		367,859
3 - High Risk Assets - Loss more likely than not	—		—		—		16,349		16,349
	$	—	$	361,444	$	297,924	$	437,834	$	1,097,202

(1) Year in which the investment was originated or acquired by us or in which a material modification occurred.

We have determined that we have one portfolio segment of financing receivables at March 31, 2021 and December 31, 2020 comprised of commercial real estate which is primarily recorded in debt and preferred equity investments.

Included in Other assets is an additional amount of financing receivables representing loans to joint venture partners totaling $66.4 million and $66.2 million at March 31, 2021 and December 31, 2020, respectively. The Company recorded provisions for loan losses related to these financing receivables of $0.0 million and $2.8 million for the three months ended March 31, 2021 and 2020, respectively. All of these loans have a risk rating of 2 and were performing in accordance with their respective terms with the exception of one financing receivable, which was put on nonaccrual in August 2018, that has a risk rating of 3 and a carrying value at March 31, 2021 of $2.5 million.

33

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

Debt Investments

    As of March 31, 2021 and December 31, 2020, we held the following debt investments with an aggregate weighted average current yield of 5.90% at March 31, 2021 (dollars in thousands):

Loan Type	March 31, 2021 Future Funding Obligations		March 31, 2021 Senior Financing		March 31, 2021 Carrying Value (1)		December 31, 2020 Carrying Value (1)		Maturity Date (2)
Fixed Rate Investments:
Junior Mortgage (3a)	$	—	$	67,000	$	42,820	$	32,888	July 2021
Mezzanine Loan	—		15,000		3,500		3,500		September 2021
Mortgage/Mezzanine Loan	—		63,750		56,246		56,244		October 2021
Mezzanine Loan	—		280,000		41,652		41,057		August 2022
Mezzanine Loan (4)	—		359,237		225,367		225,204		June 2023
Mezzanine Loan (3b)(5)	—		105,000		13,366		13,366		June 2024
Mezzanine Loan	—		95,000		30,000		30,000		January 2025
Mezzanine Loan	—		1,712,750		55,250		55,250		June 2027
Mezzanine Loan	—		85,000		20,000		20,000		December 2029
Total fixed rate	$	—	$	2,782,737	$	488,201	$	477,509
Floating Rate Investments:
Mezzanine Loan (6)	$	—	$	275,000	$	49,992	$	49,956	April 2021
Junior Mortgage Participation/Mezzanine Loan	—		60,000		15,742		15,733		July 2021
Mezzanine Loan	5,761		177,415		36,639		35,318		July 2021
Mezzanine Loan	—		61,744		29,130		29,106		July 2021
Mezzanine Loan (3c)	—		1,115,000		129,330		127,915		March 2022
Mortgage and Mezzanine Loan	6,769		—		60,922		60,532		May 2022
Mortgage and Mezzanine Loan	42,117		—		15,918		14,011		December 2022
Mezzanine Loan	52,288		71,314		21,560		19,889		May 2023
Total floating rate	$	106,935	$	1,760,473	$	359,233	$	352,460
Allowance for loan loss	$	—	$	—	$	(13,213)	$	(13,213)
Total	$	106,935	$	4,543,210	$	834,221	$	816,756

(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)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) $66.6 million (b) $12.0 million, and (c) $0.4 million.

(4)This loan was put on non-accrual in July 2020 and remains on non-accrual at March 31, 2021. No investment income has been recognized subsequent to it being put on non-accrual.

(5)This loan went into default and was put on non-accrual in June 2020 and remains on non-accrual at March 31, 2021. No investment income has been recognized subsequent to it being put on non-accrual. The Company is in discussions with the borrower.

(6)In April 2021, the maturity date of this loan was extended one year to April 2022.

34

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

Preferred Equity Investments

As of March 31, 2021 and December 31, 2020, we held the following preferred equity investments with an aggregate weighted average current yield of 9.94% at March 31, 2021 (dollars in thousands):

Type	March 31, 2021 Future Funding Obligations		March 31, 2021 Senior Financing		March 31, 2021 Carrying Value (1)		December 31, 2020 Carrying Value (1)		Mandatory Redemption (2)
Preferred Equity	$	—	$	1,712,750	$	156,169	$	154,691	June 2022
Preferred Equity	—		250,000		106,812		105,095		February 2027
Total Preferred Equity	$	—	$	1,962,750	$	262,981	$	259,786
Allowance for loan loss	$	—	$	—	$	—	$	—
Total	$	—	$	1,962,750	$	262,981	$	259,786

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

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

6. Investments in Unconsolidated Joint Ventures

We have investments in several real estate joint ventures with various partners. As of March 31, 2021, the book value of these investments was $3.7 billion, net of investments with negative book values totaling $92.4 million for which we have an implicit commitment to fund future capital needs.

As of March 31, 2021 and December 31, 2020, 800 Third Avenue, 21 East 66th Street, 605 West 42nd Street, 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 $132.7 million and $134.0 million as of March 31, 2021 and December 31, 2020, respectively. Our maximum loss is limited to the amount of our equity investment in these VIEs. See the "Principles of Consolidation" section of Note 2, "Significant Accounting Policies." 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 March 31, 2021:

Property	Partner	Ownership Interest (1)	Economic Interest (1)	Unaudited Approximate Square Feet
100 Park Avenue	Prudential Real Estate Investors	49.90%	49.90%	834,000
717 Fifth Avenue	Wharton Properties/Private Investor	10.92%	10.92%	119,500
800 Third Avenue	Private Investors	60.52%	60.52%	526,000
919 Third Avenue	New York State Teacher's Retirement System	51.00%	51.00%	1,454,000
11 West 34th Street	Private Investor/Wharton Properties	30.00%	30.00%	17,150
280 Park Avenue	Vornado Realty Trust	50.00%	50.00%	1,219,158
1552-1560 Broadway (2)	Wharton Properties	50.00%	50.00%	57,718
10 East 53rd Street	Canadian Pension Plan Investment Board	55.00%	55.00%	354,300
21 East 66th Street (3)	Private Investors	32.28%	32.28%	13,069
650 Fifth Avenue (4)	Wharton Properties	50.00%	50.00%	69,214
121 Greene Street	Wharton Properties	50.00%	50.00%	7,131
Stonehenge Portfolio	Various	Various	Various	1,439,016
605 West 42nd Street (5)	The Moinian Group	20.00%	20.00%	927,358
11 Madison Avenue	PGIM Real Estate	60.00%	60.00%	2,314,000
400 East 57th Street (6)	BlackRock, Inc and Stonehenge Partners	51.00%	41.00%	290,482
One Vanderbilt	National Pension Service of Korea/Hines Interest LP	71.01%	71.01%	1,657,198
Worldwide Plaza	RXR Realty / New York REIT / Private Investor	24.35%	24.35%	2,048,725
1515 Broadway	Allianz Real Estate of America	56.87%	56.87%	1,750,000
2 Herald Square	Israeli Institutional Investor	51.00%	51.00%	369,000

35

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

Property	Partner	Ownership Interest (1)	Economic Interest (1)	Unaudited Approximate Square Feet
115 Spring Street	Private Investor	51.00%	51.00%	5,218
15 Beekman (7)	A fund managed by Meritz Alternative Investment Management	20.00%	20.00%	221,884
85 Fifth Avenue	Wells Fargo	36.30%	36.30%	12,946
One Madison Avenue (8)	National Pension Service of Korea/Hines Interest LP	50.50%	50.50%	1,048,700

(1)Ownership interest and economic interest represent the Company's interests in the joint venture as of March 31, 2021. Changes in ownership or economic interests within the current year are disclosed in the notes below.

(2)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.

(3)We hold a 32.28% interest in three retail units and one residential unit at the property and a 16.14% interest in three residential units at the property.

(4)The joint venture owns a long-term leasehold interest in the retail space at 650 Fifth Avenue.

(5)In April 2021, we entered into contract to sell our interest in the property. This transaction is expected to close in the second quarter of 2021 subject to customary closing conditions.

(6)In October 2016, we sold a 49% interest in this property. Our 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. Our joint venture with Stonehenge remains consolidated resulting in the combined 51% interest being shown within investments in unconsolidated joint ventures on our balance sheet. In April 2021, we entered into contract to sell our interest in the property. In connection with this contract, we recorded a charge of $5.7 million, which is included in depreciable real estate reserves and impairment in the consolidated statements of operations. This transaction is expected to close in the third quarter of 2021 subject to customary closing conditions.

(7)In 2020, the Company formed a joint venture, which then entered into a long-term sublease with the Company.

(8)In 2020, the Company admitted partners to the One Madison Avenue development project, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and the deconsolidation of our remaining 50.5% interest. We recorded our investment at fair value, which resulted in the recognition of a fair value adjustment of $187.5 million in 2020 and a fair value adjustment of $2.7 million during the three months ended March 31, 2021. The fair value of our investment was determined by the terms of the joint venture agreement governing the capitalization of the project. The partners have committed aggregate equity to the project totaling no less than $492.2 million and their ownership interest in the joint venture is based on their capital contributions, up to an aggregate maximum of 49.5%. At March 31, 2021, the total of the two partners' ownership interests based on equity contributed was 9.0%.

Disposition of Joint Venture Interests or Properties

The following table summarizes the investments in unconsolidated joint ventures disposed of during the three months ended March 31, 2021:

Property	Ownership Interest Disposed	Disposition Date	Gross Asset Valuation (in thousands)		Gain (Loss) on Sale (in thousands) (1)
885 Third Avenue (2)	N/A	January 2021	N/A		N/A
55 West 46th Street - Tower 46	25.0%	March 2021	$	275.0	$	(15.2)

(1)Represents the Company's share of the gain or loss.

(2)In January 2021, pursuant to the partnership documents of our 885 Third Avenue investment, certain participating rights of the common member expired. As a result, it was determined that we are the primary beneficiary of the VIE and the investment was consolidated in our financial statements. See Note 3, "Property Acquisitions."

Joint Venture Mortgages and Other Loans Payable

We generally finance our joint ventures with non-recourse debt. In certain cases we may provide guarantees or master leases for tenant space, which terminate upon the satisfaction of specified circumstances or repayment of the underlying loans. The mortgage notes and other loans payable collateralized by the respective joint venture properties and assignment of leases at March 31, 2021 and December 31, 2020, respectively, are as follows (dollars in thousands):

Property	Economic Interest (1)		Initial Maturity Date	Final Maturity Date (2)	Interest Rate (3)			March 31, 2021		December 31, 2020
Fixed Rate Debt:
717 Fifth Avenue (mortgage)	10.92	%	July 2022	July 2022		4.45	%	$	300,000	$	300,000
717 Fifth Avenue (mezzanine)	10.92	%	July 2022	July 2022		5.50	%	355,328		355,328
650 Fifth Avenue (mortgage)	50.00	%	October 2022	October 2022		4.46	%	210,000		210,000
650 Fifth Avenue (mezzanine)	50.00	%	October 2022	October 2022		5.45	%	65,000		65,000
21 East 66th Street	32.28	%	April 2023	April 2028		3.60	%	12,000		12,000

36

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

Property	Economic Interest (1)		Initial Maturity Date	Final Maturity Date (2)	Interest Rate (3)			March 31, 2021		December 31, 2020
919 Third Avenue	51.00	%	June 2023	June 2023		5.12	%	500,000		500,000
1515 Broadway	56.87	%	March 2025	March 2025		3.93	%	815,876		820,607
11 Madison Avenue	60.00	%	September 2025	September 2025		3.84	%	1,400,000		1,400,000
800 Third Avenue	60.52	%	February 2026	February 2026		3.37	%	177,000		177,000
400 East 57th Street (4)	41.00	%	November 2026	November 2026		3.00	%	97,024		97,024
Worldwide Plaza	24.35	%	November 2027	November 2027		3.98	%	1,200,000		1,200,000
Stonehenge Portfolio (5)	Various		Various	Various		3.50	%	195,899		195,899
885 Third Avenue (6)								—		272,000
Total fixed rate debt								$	5,328,127	$	5,604,858
Floating Rate Debt:
280 Park Avenue	50.00	%	September 2021	September 2024	L+	1.73	%	$	1,200,000	$	1,200,000
One Vanderbilt (7)	71.01	%	September 2021	September 2023	L+	2.50	%	1,283,292		1,210,329
1552 Broadway	50.00	%	October 2021	October 2022	L+	2.65	%	195,000		195,000
2 Herald Square	51.00	%	November 2021	November 2023	L+	1.45	%	214,500		214,500
11 West 34th Street	30.00	%	January 2022	January 2023	L+	1.45	%	23,000		23,000
121 Greene Street (8)	50.00	%	November 2022	November 2022	L+	2.00	%	13,771		15,000
115 Spring Street	51.00	%	September 2023	September 2023	L+	3.40	%	65,550		65,550
100 Park Avenue	49.90	%	December 2023	December 2025	L+	2.25	%	360,000		360,000
15 Beekman (9)	20.00	%	January 2024	July 2025	L+	1.50	%	19,165		11,212
10 East 53rd Street	55.00	%	February 2025	February 2025	L+	1.35	%	220,000		220,000
One Madison Avenue (10)	50.50	%	November 2025	November 2026	L+	3.35	%	40,104		—
605 West 42nd Street (11)	20.00	%	August 2027	August 2027	L+	1.44	%	550,000		550,000
21 East 66th Street	32.28	%	June 2033	June 2033	T+	2.75	%	666		677
55 West 46th Street								—		192,524
Total floating rate debt								$	4,185,048	$	4,257,792
Total joint venture mortgages and other loans payable								$	9,513,175	$	9,862,650
Deferred financing costs, net								(98,252)		(113,446)
Total joint venture mortgages and other loans payable, net								$	9,414,923	$	9,749,204

(1)Economic interest represents the Company's interests in the joint venture as of March 31, 2021. Changes in ownership or economic interests, if any, within the current year are disclosed in the notes to the investment in unconsolidated joint ventures table above.

(2)Reflects exercise of all available options. The ability to exercise extension options may be subject to certain tests based on the operating performance of the property.

(3)Interest rates as of March 31, 2021, taking into account interest rate hedges in effect during the period. Floating rate debt is presented with the stated spread over the 30-day LIBOR ("L") or 1-year Treasury ("T").

(4)In April 2021, we entered into a contract to sell our interest in the property. This transaction is expected to close in the third quarter of 2021 subject to customary closing conditions.

(5)Comprised of three mortgages totaling $132.4 million that mature in April 2028 and two mortgages totaling $63.5 million that mature in July 2029.

(6)This loan was repaid in the first quarter of 2021, and as of March 31, 2021, the property is consolidated in our financial statements. See Note 3, "Property Acquisitions."

(7)This loan is a $1.75 billion construction facility with reductions in interest cost based on meeting certain conditions, the first of which has been satisfied, and has an initial term of three years with two one year extension options. Advances under the loan are subject to costs incurred. In conjunction with the loan, we provided partial guarantees for interest and principal payments, the amounts of which are based on certain construction milestones and operating metrics.

(8)In March 2021, the maturity date of this loan was extended by one year.

(9)This loan is a $125.0 million construction facility. Advances under the loan are subject to costs incurred.

(10)The loan is a $1.25 billion construction facility with an initial term of five years with one one year extension option. Advances under the loan are subject to costs incurred. In conjunction with the loan, we provided partial guarantees for interest and principal payments, the amounts of which are based on certain construction milestones and operating metrics.

(11)In April 2021, we entered into contract to sell our interest in the property. This transaction is expected to close in the second quarter of 2021 subject to customary closing conditions.

37

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

We are entitled to receive fees for providing management, leasing, construction supervision and asset management services to certain of our joint ventures. We earned $2.4 million from these services, net of our ownership share of the joint ventures, for the three months ended March 31, 2021. We earned $2.2 million from these services, net of our ownership share of the joint ventures, for the three months ended March 31, 2020. 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 March 31, 2021 and December 31, 2020 are as follows (in thousands):

	March 31, 2021		December 31, 2020
Assets (1)
Commercial real estate property, net	$	15,243,331	$	16,143,880
Cash and restricted cash	317,753		357,076
Tenant and other receivables, related party receivables, and deferred rents receivable	412,203		403,883
Other assets	1,950,444		2,001,612
Total assets	$	17,923,731	$	18,906,451
Liabilities and equity (1)
Mortgages and other loans payable, net	$	9,414,923	$	9,749,204
Deferred revenue	1,311,191		1,341,571
Lease liabilities	985,622		1,002,563
Other liabilities	373,400		464,107
Equity	5,838,595		6,349,006
Total liabilities and equity	$	17,923,731	$	18,906,451
Company's investments in unconsolidated joint ventures	$	3,698,701	$	3,823,322

(1)At March 31, 2021, $174.2 million of net unamortized basis differences between the amount at which our investments are carried and our share of equity in net assets of the underlying property will be amortized through equity in net income (loss) from unconsolidated joint ventures over the remaining life of the underlying items having given rise to the differences.

The combined statements of operations for the unconsolidated joint ventures, from acquisition date through the three months ended March 31, 2021 and 2020, are as follows (in thousands):

	Three Months Ended March 31,
	2021		2020
Total revenues	$	301,541	$	282,520
Operating expenses	46,233		51,590
Real estate taxes	54,592		53,372
Operating lease rent	5,644		6,361
Interest expense, net of interest income	78,749		86,324
Amortization of deferred financing costs	6,384		4,814
Depreciation and amortization	114,879		98,584
Total expenses	306,481		301,045
Net loss before gain on sale	$	(4,940)	$	(18,525)
Company's equity in net loss from unconsolidated joint ventures	$	(2,864)	$	(12,814)

38

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

7. Deferred Costs

Deferred costs at March 31, 2021 and December 31, 2020 consisted of the following (in thousands):

	March 31, 2021		December 31, 2020
Deferred leasing costs	$	448,197	$	447,002
Less: accumulated amortization	(277,945)		(269,834)
Deferred costs, net	$	170,252	$	177,168

8. Mortgages and Other Loans Payable

The mortgages and other loans payable collateralized by the respective properties and assignment of leases or debt investments at March 31, 2021 and December 31, 2020, respectively, were as follows (dollars in thousands):

Property	Initial Maturity Date	Final Maturity Date (1)	Interest Rate (2)		March 31, 2021		December 31, 2020
Fixed Rate Debt:
100 Church Street	July 2022	July 2022		4.68%	$	203,697	$	204,875
420 Lexington Avenue	October 2024	October 2040		3.99%	292,672		294,035
Landmark Square	January 2027	January 2027		4.90%	100,000		100,000
485 Lexington Avenue	February 2027	February 2027		4.25%	450,000		450,000
1080 Amsterdam (3)	February 2027	February 2027		3.59%	34,773		34,773
Total fixed rate debt					$	1,081,142	$	1,083,683
Floating Rate Debt:
185 Broadway (4)	November 2021	November 2023	L+	2.85%	$	168,870	$	158,478
609 Fifth Avenue	March 2022	March 2022	L+	2.95%	57,651		57,651
220 East 42nd Street	June 2023	June 2025	L+	2.75%	510,000		510,000
719 Seventh Avenue	September 2023	September 2023	L+	1.20%	50,000		50,000
133 Greene Street					—		15,523
106 Spring Street					—		38,025
FHLB Facility					—		10,000
FHLB Facility					—		15,000
FHLB Facility					—		35,000
712 Madison Avenue					—		28,000
2017 Master Repurchase Agreement (5)					—		—
Total floating rate debt					$	786,521	$	917,677
Total mortgages and other loans payable					$	1,867,663	$	2,001,360
Deferred financing costs, net of amortization					(18,962)		(21,388)
Total mortgages and other loans payable, net					$	1,848,701	$	1,979,972

(1)Reflects exercise of all available options. The ability to exercise extension options may be subject to certain tests based on the operating performance of the property.

(2)Interest rate as of March 31, 2021, taking into account interest rate hedges in effect during the period. Floating rate debt is presented with the stated spread over the 30-day LIBOR, unless otherwise specified.

(3)The loan is comprised of a $33.9 million mortgage loan and $0.9 million mezzanine loan with a fixed interest rate of 350 basis points and 700 basis points, respectively, for the first five years and is prepayable without penalty at the end of fifth year.

(4)This loan is a $225.0 million construction facility, with reductions in interest cost based on meeting certain conditions, and has an initial three year term with two one year extension options. Advances under the loan are subject to incurred costs and funded equity requirements.

(5)In June 2020, we exercised a one year extension option which extended the maturity date to June 2021. At March 31, 2021, there was no outstanding balance on the $400 million facility.

At March 31, 2021 and December 31, 2020, the gross book value of the properties and debt and preferred equity investments collateralizing the mortgages and other loans payable was approximately $2.4 billion and $2.5 billion, respectively.

39

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

Federal Home Loan Bank of New York ("FHLB") Facility

As of December 31, 2020, the Company’s wholly-owned subsidiary, Ticonderoga Insurance Company, or Ticonderoga, a Vermont licensed captive insurance company, was a member of the Federal Home Loan Bank of New York, or FHLBNY. As a member, Ticonderoga was able to borrow funds from the FHLBNY in the form of secured advances that bore interest at a floating rate. As a result of a Final Ruling from the Federal Housing Finance Authority, the regulator of the Federal Home Loan Bank system, all captive insurance company memberships were terminated as of February 2021. As such, all advances to Ticonderoga were repaid prior to such termination.

Master Repurchase Agreement

The Company entered into a Master Repurchase Agreement, or MRA, known as the 2017 MRA, which provides us with the ability to sell certain mortgage 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 facility 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 collateralize 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. As of March 31, 2021, there have been no margin calls on the 2017 MRA.

In April 2018, we increased the maximum facility capacity from $300.0 million to $400.0 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 is scheduled to mature in June 2021, with a one-year extension option. At March 31, 2021, the facility had no outstanding balance.

9. Corporate Indebtedness

2017 Credit Facility

In November 2017, we entered into an amendment to the credit facility, referred to as the 2017 credit facility, that was originally entered into by the Company in November 2012, or the 2012 credit facility. As of March 31, 2021, the 2017 credit facility consisted of a $1.5 billion revolving credit facility, a $1.3 billion term loan (or "Term Loan A"), and a $200.0 million term loan (or "Term Loan B") with maturity dates of March 31, 2022, March 31, 2023, and November 21, 2024, respectively. The revolving credit facility has two six-month, as-of-right extension options to March 31, 2023. We also have an option, subject to customary conditions, to increase the capacity of the credit facility to $4.5 billion at any time prior to the maturity dates for the revolving credit facility and term loans without the consent of existing lenders, by obtaining additional commitments from our existing lenders and other financial institutions.

As of March 31, 2021, the 2017 credit facility bore interest at a spread over 30-day LIBOR ranging from (i) 82.5 basis points to 155 basis points for loans under the revolving credit facility, (ii) 90 basis points to 175 basis points for loans under Term Loan A, and (iii) 85 basis points to 165 basis points for loans under Term Loan B, in each case based on the credit rating assigned to the senior unsecured long term indebtedness of the Company. In instances where there are either only two ratings available or where there are more than two and the difference between them is one rating category, the applicable rating shall be the highest rating. In instances where there are more than two ratings and the difference between the highest and the lowest is two or more rating categories, then the applicable rating used is the average of the highest two, rounded down if the average is not a recognized category.

At March 31, 2021, the applicable spread was 100 basis points for the revolving credit facility, 110 basis points for Term Loan A, and 100 basis points for Term Loan B. 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 the Company. As of March 31, 2021, the facility fee was 20 basis points.

As of March 31, 2021, we had $16.5 million of outstanding letters of credit, $630.0 million drawn under the revolving credit facility and $1.5 billion outstanding under the term loan facilities, with total undrawn capacity of $0.9 billion under the 2017 credit facility. At March 31, 2021 and December 31, 2020, the revolving credit facility had a carrying value of $625.8 million and $105.3 million, respectively, net of deferred financing costs. At March 31, 2021 and December 31, 2020, the term loan facilities had a carrying value of $1.5 billion and $1.5 billion, respectively, net of deferred financing costs.

The Company and the Operating Partnership are borrowers jointly and severally obligated under the 2017 credit facility. The 2017 credit facility includes certain restrictions and covenants (see Restrictive Covenants below).

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

Senior Unsecured Notes

The following table sets forth our senior unsecured notes and other related disclosures as of March 31, 2021 and December 31, 2020, respectively, by scheduled maturity date (dollars in thousands):

Issuance	March 31, 2021 Unpaid Principal Balance		March 31, 2021 Accreted Balance		December 31, 2020 Accreted Balance		Interest Rate (1)			Initial Term (in Years)	Maturity Date
August 7, 2018 (2) (3)	$	350,000	$	350,000	$	350,000		1.52	%	3	August 2021
October 5, 2017 (2)	500,000		499,830		499,803			3.25	%	5	October 2022
November 15, 2012 (4)	300,000		301,817		302,086			4.50	%	10	December 2022
December 17, 2015 (5)	100,000		100,000		100,000			4.27	%	10	December 2025
	$	1,250,000	$	1,251,647	$	1,251,889
Deferred financing costs, net			(3,025)		(3,670)
	$	1,250,000	$	1,248,622	$	1,248,219

(1)Interest rate as of March 31, 2021, taking into account interest rate hedges in effect during the period.

(2)Issued by the Operating Partnership with the Company as the guarantor.

(3)The notes are subject to redemption at the Company's option, in whole but not in part, at a redemption price equal to 100% of the principal amount of the notes, plus unpaid accrued interest thereon to the redemption date. In April 2020, the Company entered into $350.0 million of fixed rate interest swaps at a rate of 0.54375% through August 2021.

(4)In October 2017, the Company and the Operating Partnership as co-obligors issued an additional $100.0 million of 4.50% senior unsecured notes due December 2022. The notes were priced at 105.334% of par.

(5)Issued by the Company and the Operating Partnership as co-obligors.

Restrictive Covenants

The terms of the 2017 credit facility 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 March 31, 2021 and December 31, 2020, 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. 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.

41

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

Principal Maturities

Combined aggregate principal maturities of mortgages and other loans payable, the 2017 credit facility, trust preferred securities, senior unsecured notes and our share of joint venture debt as of March 31, 2021, including as-of-right extension options, were as follows (in thousands):

	Scheduled Amortization		Mortgages and Other Loans Payable		Revolving Credit Facility		Unsecured Term Loans		Trust Preferred Securities		Senior Unsecured Notes		Total		Joint Venture Debt
Remaining 2021	$	8,031	$	168,870	$	—	$	—	$	—	$	350,000	$	526,901	$	1,126,896
2022	8,765		255,435		—		—		—		800,000		1,064,200		227,701
2023	6,594		560,000		630,000		1,300,000		—		—		2,496,594		491,066
2024	5,280		272,749		—		200,000		—		—		478,029		620,843
2025	823		—		—		—		—		100,000		100,823		1,403,266
Thereafter	924		580,192		—		—		100,000		—		681,116		552,813
	$	30,417	$	1,837,246	$	630,000	$	1,500,000	$	100,000	$	1,250,000	$	5,347,663	$	4,422,585

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

	Three Months Ended March 31,
	2021		2020
Interest expense before capitalized interest	$	39,868	$	56,813
Interest on financing leases	1,492		1,663
Interest capitalized	(17,583)		(20,483)
Interest income	(389)		(499)
Interest expense, net	$	23,388	$	37,494

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, who serves as a member and as the chairman emeritus of our 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 the profit participation, which is included in Other income on the consolidated statements of operations, was $0.3 million and $0.9 million for the three months ended March 31, 2021 and 2020, respectively.

We also recorded expenses, inclusive of capitalized expenses, of $2.3 million and $3.9 million for the three months ended March 31, 2021 and 2020, respectively, for these services (excluding services provided directly to tenants).

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 $0.2 million for the three months ended March 31, 2021 and 2020, respectively.

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

One Vanderbilt Investment

In December 2016, we entered into agreements with entities owned and controlled by our Chairman and CEO, Marc Holliday, and our President, 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. The entities owned and controlled by Messrs. Holliday and Mathias paid $1.4 million and $1.0 million, respectively, which equal 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.

One Vanderbilt Lease

In November 2018, we entered into a lease agreement with the One Vanderbilt joint venture covering certain floors at the property. In March 2021, the lease commenced and we relocated our corporate headquarters to the leased space. For the three months ended March 31, 2021, we recorded $0.1 million of rent expense under the lease, which is included in Marketing, general and administrative in the consolidated statements of operations. See Note 19, “Commitments and Contingencies.”

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 Note 6, "Investments in Unconsolidated Joint Ventures." Amounts due from joint ventures and related parties at March 31, 2021 and December 31, 2020 consisted of the following (in thousands):

	March 31, 2021		December 31, 2020
Due from joint ventures	$	26,500	$	27,006
Other	7,810		7,651
Related party receivables	$	34,310	$	34,657

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 March 31, 2021 and December 31, 2020, the noncontrolling interest unit holders owned 5.65%, or 4,156,282 units, and 5.44%, or 3,938,823 units, of the Operating Partnership, respectively, inclusive of retroactive adjustments to reflect the reverse stock split effectuated by SL Green in January 2021. As of March 31, 2021, 4,156,282 shares of our 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 our common stock at the end of the reporting period.

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

Below is a summary of the activity relating to the noncontrolling interests in the Operating Partnership for the three months ended March 31, 2021 and the twelve months ended December 31, 2020 (in thousands):

	March 31, 2021		December 31, 2020
Balance at beginning of period	$	358,262	$	409,862
Distributions	(4,148)		(12,652)
Issuance of common units	4,483		12,018
Redemption and conversion of common units	(13,261)		(36,085)
Net (loss) income	(476)		20,016
Accumulated other comprehensive income (loss) allocation	2,655		(2,299)
Fair value adjustment	26,609		(32,598)
Balance at end of period	$	374,124	$	358,262

Preferred Units of Limited Partnership Interest in the Operating Partnership

Below is a summary of the preferred units of limited partnership interest in the Operating Partnership as of March 31, 2021:

Issuance	Stated Distribution Rate		Number of Units Authorized	Number of Units Issued	Number of Units Outstanding	Annual Dividend Per Unit(1)		Liquidation Preference Per Unit(2)		Conversion Price Per Unit(3)		Date of Issuance
Series A (4)	3.50	%	109,161	109,161	109,161	$	35.0000	$	1,000.00	$	—	August 2015
Series F	7.00%		60	60	60	$	70.0000	$	1,000.00	$	29.12	January 2007
Series G (5)	4.50%		1,902,000	1,902,000	718,697	$	1.1250	$	25.00	$	88.50	January 2012
Series K	3.50%		700,000	563,954	341,677	$	0.8750	$	25.00	$	134.67	August 2014
Series L	4.00%		500,000	378,634	372,634	$	1.0000	$	25.00	$	—	August 2014
Series M	3.75%		1,600,000	1,600,000	96,357	$	0.9375	$	25.00	$	—	February 2015
Series P	4.00%		200,000	200,000	200,000	$	1.0000	$	25.00	$	—	July 2015
Series Q	3.50%		268,000	268,000	268,000	$	0.8750	$	25.00	$	148.95	July 2015
Series R	3.50%		400,000	400,000	400,000	$	0.8750	$	25.00	$	154.89	August 2015
Series S	4.00%		1,077,280	1,077,280	1,077,280	$	1.0000	$	25.00	$	—	August 2015
Series V	3.50%		40,000	40,000	40,000	$	0.8750	$	25.00	$	—	May 2019
Series W (6)	(6)		1	1	1	(6)		(6)		(6)		January 2020

(1)Dividends are cumulative, subject to certain provisions.

(2)Units are redeemable at any time at par for cash at the option of the unitholder unless otherwise specified.

(3)If applicable, 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) the amount shown in the table.

(4)Issued through a consolidated subsidiary. The units 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 March 31, 2021, no Subsidiary Series B Preferred Units have been issued.

(5)Common units of limited partnership interest in the Operating Partnership issued in a conversion may be redeemed in exchange for our 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.

(6)The Series W preferred unit was issued in January 2020 in exchange for the then-outstanding Series O preferred unit. The holder of the Series W preferred unit is entitled to quarterly dividends in an amount calculated as (i) 1,350 multiplied by (ii) the current distribution per common unit of limited partnership in SL Green Operating Partnership. The holder has the right to require the Operating Partnership to repurchase the Series W unit for cash, or convert the Series W unit for Class B units, in each case at a price that is determined based on the closing price of the Company's common stock at the time such right is exercised. The unit's liquidation preference is the fair market value of the unit plus accrued distributions at the time of a liquidation event.

44

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

Below is a summary of the activity relating to the preferred units in the Operating Partnership for the three months ended March 31, 2021 and the twelve months ended December 31, 2020 (in thousands):

	March 31, 2021		December 31, 2020
Balance at beginning of period	$	202,169	$	283,285
Issuance of preferred units	—		—
Redemption of preferred units	(3,631)		(82,750)
Dividends paid on preferred units	(1,731)		(6,163)
Accrued dividends on preferred units	1,696		7,797
Balance at end of period	$	198,503	$	202,169

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 March 31, 2021, 69,353,606 shares of common stock and no shares of excess stock were issued and outstanding.

On December 4, 2020 our Board of Directors declared an ordinary dividend and a special dividend (together, "the Total Dividend"). The Total Dividend was paid on January 15, 2021 to shareholders of record at the close of business on December 15, 2020 ("the Record Date"). Shareholders had the opportunity to elect to receive the Total Dividend in the form of all cash or all stock, subject to proration if either option was oversubscribed. Shareholders who elected to receive cash received, for each share of common stock they owned as of the Record Date, approximately $0.3735 in cash and 0.0279 shares of common stock. Shareholders who elected to receive shares received, for each share of common stock they owned as of the Record Date, approximately 0.0343 shares of common stock. The number of shares issued was calculated based on the volume weighted average trading price of SLG's common stock between January 5-7, 2021, of $58.15 per share.

To mitigate the dilutive impact of the common stock issued in the special dividend, the board of directors also authorized a reverse stock split, which was effective after markets closed on January 20, 2021. On January 8, 2021, a committee of the Board of Directors calculated the ratio for the reverse stock split of our issued and outstanding shares of common stock as 1.02918-for-1. After the issuance of the dividend and the completion of the reverse stock split, the number of shares of our common stock outstanding was equivalent to the number of total shares outstanding on the Record Date (not including any issuances or repurchases that occurred following the Record Date, as well as any fractional shares that would have been issued but for which cash-in-lieu was paid). However, on a relative basis, some individual shareholders may have more shares of SLG’s common stock, and some individual shareholders may have fewer shares of our common stock, depending on their individual elections to receive cash or stock and as a result of the cash option being oversubscribed.

All share-related references and measurements including the number of shares outstanding, share prices, number of shares repurchased, earnings per share, dividends per share, and share-based compensation awards, have been retroactively adjusted to reflect the reverse stock split for all periods presented in this Quarterly Report on Form 10-Q.

Share Repurchase Program

In August 2016, our Board of Directors approved a $1.0 billion share repurchase program under which we can buy shares of our common stock. The Board of Directors has since authorized five separate $500.0 million increases to the size of the share repurchase program in the fourth quarter of 2017, second quarter of 2018, fourth quarter of 2018, fourth quarter of 2019, and fourth quarter of 2020 bringing the total program size to $3.5 billion.

At March 31, 2021, share repurchases, excluding the redemption of OP units, executed under the program were as follows:

Period	Shares repurchased	Average price paid per share	Cumulative number of shares repurchased as part of the repurchase plan or programs
Year ended 2017	8,105,881	$104.61	8,105,881
Year ended 2018	9,468,617	$99.03	17,574,498

45

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

Year ended 2019	4,465,857	$86.06	22,040,355
Year Ended 2020	8,529,279	$62.39	30,569,634
Three months ended March 31, 2021	1,306,460	$61.46	31,876,094

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 any time, in whole or from time to time in part, at par for cash. 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 ("DRSPP")

In February 2018, 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 our common stock under the DRSPP. The DRSPP commenced on September 24, 2001.

The following table summarizes SL Green common stock issued, and proceeds received from dividend reinvestments and/or stock purchases under the DRSPP for the three months ended March 31, 2021 and 2020, respectively (dollars in thousands):

	Three Months Ended March 31,
	2021		2020
Shares of common stock issued	5,483		1,727
Dividend reinvestments/stock purchases under the DRSPP	$	351	$	166

Earnings per Share

We use the two-class method of computing earnings per share (“EPS”), which is an earnings allocation formula that determines EPS for common stock and any participating securities according to dividends declared (whether paid or unpaid). Under the two-class method, basic EPS is computed by dividing the income available to common stockholders by the weighted-average number of common stock shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur from share equivalent activity.

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

SL Green's earnings per share for the three months ended March 31, 2021 and 2020 are computed as follows (in thousands):

	Three Months Ended March 31,
Numerator	2021		2020
Basic Earnings:
Net (loss) income attributable to SL Green common stockholders	$	(7,464)	$	114,801
Less: distributed earnings allocated to participating securities	(371)		(113)
Less: undistributed earnings allocated to participating securities	—		(464)
Net (loss) income attributable to SL Green common stockholders (numerator for basic earnings per share)	$	(7,835)	$	114,224
Add back: dilutive effect of earnings allocated to participating securities	371		113
Add back: undistributed earnings allocated to participating securities	—		464
Add back: effect of dilutive securities (redemption of units to common shares)	(476)		6,202
Net (loss) income attributable to SL Green common stockholders (numerator for diluted earnings per share)	$	(7,940)	$	121,003

	Three Months Ended March 31,
Denominator	2021	2020
Basic Shares:
Weighted average common stock outstanding	69,010	75,656
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares	4,148	4,220
Stock-based compensation plans	595	476
Contingently issuable shares from special dividend declared December 4, 2020 and issued January 15, 2021	317	—
Diluted weighted average common stock outstanding	74,070	80,352

The Company has excluded 1,159,343 common stock equivalents from the calculation of diluted shares outstanding for the three months ended March 31, 2021, as they were anti-dilutive. The Company has excluded 1,170,579 common stock equivalents from the calculation of diluted shares outstanding for the three months ended March 31, 2020, as they were anti-dilutive.

13. Partners' Capital of the Operating Partnership

The Company is the sole managing general partner of the Operating Partnership and at March 31, 2021 owned 69,353,606 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.

47

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

All unit-related references and measurements including the number of units outstanding and earnings per unit have been retroactively adjusted to reflect the reverse stock split effectuated by SL Green’s board of directors in January 2021 for all periods presented in this Quarterly Report on Form 10-Q.

Limited Partner Units

As of March 31, 2021, limited partners other than SL Green owned 5.65%, or 4,156,282 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 months ended March 31, 2021 and 2020, respectively, are computed as follows (in thousands):

	Three Months Ended March 31,
Numerator	2021		2020
Basic Earnings:
Net (loss) income attributable to SLGOP common unitholders	$	(7,940)	$	121,003
Less: distributed earnings allocated to participating securities	(371)		(113)
Less: undistributed earnings allocated to participating securities	—		(464)
Net (loss) income attributable to SLGOP common unitholders (numerator for basic earnings per unit)	$	(8,311)	$	120,426
Add back: dilutive effect of earnings allocated to participating securities	371		113
Add back: undistributed earnings allocated to participating securities	—		464
Net (loss) income attributable to SLGOP common unitholders (numerator for diluted earnings per unit)	$	(7,940)	$	121,003

	Three Months Ended March 31,
Denominator	2021	2020
Basic units:
Weighted average common units outstanding	73,158	79,876
Effect of Dilutive Securities:
Stock-based compensation plans	595	476
Contingently issuable units from special distribution declared December 4, 2020 and issued January 15, 2021	317	—
Diluted weighted average common units outstanding	74,070	80,352

The Operating Partnership has excluded 1,159,343 common unit equivalents from the diluted units outstanding for the three months ended March 31, 2021 as they were anti-dilutive. The Operating Partnership has excluded 1,170,579 common unit equivalents from the diluted units outstanding for the three months ended March 31, 2020 as they were anti-dilutive.

14. Share-based Compensation

We have share-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.

48

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

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) 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., 10-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 our 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 March 31, 2021, 1.9 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.

Stock Options and Class O LTIP Units

Options are granted 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 years or ten years from the date of grant, are not transferable other than on death, and generally vest in one year 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.

There were no options granted during the three months ended March 31, 2021 or the year ended December 31, 2020.

A summary of the status of the Company's stock options as of March 31, 2021 and December 31, 2020, and changes during the three months ended March 31, 2021 and year ended December 31, 2020 are as follows:

	March 31, 2021			December 31, 2020
	Options Outstanding	Weighted Average Exercise Price		Options Outstanding	Weighted Average Exercise Price
Balance at beginning of period	784,995	$	102.62	1,007,665	$	105.35
Granted	—	—		—	—
Exercised	—	—		—	—
Lapsed or canceled	(9,716)	86.13		(222,670)	114.97
Balance at end of period	775,279	$	102.83	784,995	$	102.62
Options exercisable at end of period	775,278	$	102.83	782,022	$	102.62

The remaining weighted average contractual life of the options outstanding was 1.9 years and the remaining average contractual life of the options exercisable was 1.9 years.

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

During the three months ended March 31, 2021, we recognized no compensation expense related to options. During the three months ended March 31, 2020, we recognized compensation expense related to options of $0.02 million. As of March 31, 2021, there was no unrecognized compensation cost related to unvested stock options.

Restricted Shares

Shares are granted to certain employees, including our executives, and vesting occurs 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 March 31, 2021 and December 31, 2020 and changes during the three months ended March 31, 2021 and the year ended December 31, 2020, are as follows:

	March 31, 2021		December 31, 2020
Balance at beginning of period	3,439,674		3,465,347
Granted	145,845		8,959
Canceled	(12,437)		(34,632)
Balance at end of period	3,573,082		3,439,674
Vested during the period	117,487		128,891
Compensation expense recorded	$	2,067,125	$	10,895,459
Total fair value of restricted stock granted during the period	$	9,214,531	$	734,315

The fair value of restricted stock that vested during the three months ended March 31, 2021 and the year ended December 31, 2020 was $10.9 million and $12.5 million, respectively. As of March 31, 2021, there was $14.0 million of total unrecognized compensation cost related to restricted stock, which is expected to be recognized over a weighted average period of 2.0 years.

We granted LTIP Units, which include bonus, time-based and performance-based awards, with a fair value of $40.3 million and $37.0 million as of March 31, 2021 and December 31, 2020, 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 our 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 March 31, 2021, there was $65.9 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 2.0 years.

During the three months ended March 31, 2021, we recorded compensation expense related to bonus, time-based and performance based awards of $9.1 million. During the three months ended March 31, 2020, we recorded compensation expense related to bonus, time-based and performance based awards of $3.0 million.

For the three months ended March 31, 2021, $0.5 million was capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options. For the three months ended March 31, 2020, $0.6 million was capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options.

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 our 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 three months ended March 31, 2021, 18,290 phantom stock units and 12,064 shares of common stock were issued to our board of directors. We recorded compensation expense of $1.8 million during the three months ended March 31,

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

2021 related to the Deferred Compensation Plan. We recorded compensation expense of $1.8 million during the three months ended March 31, 2020 related to the Deferred Compensation Plan.

As of March 31, 2021, there were 159,066 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 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 March 31, 2021, 157,576 shares of our common stock had been issued under the ESPP.

15. Accumulated Other Comprehensive Loss

The following tables set forth the changes in accumulated other comprehensive loss by component as of March 31, 2021 (in thousands):

	Net unrealized loss on derivative instruments (1)		SL Green’s share of joint venture net unrealized loss on derivative instruments (2)		Net unrealized gain (loss) on marketable securities		Total
Balance at December 31, 2020	$	(57,415)	$	(10,853)	$	1,021	$	(67,247)
Other comprehensive income before reclassifications	9,771		33,024		(247)		42,548
Amounts reclassified from accumulated other comprehensive loss	4,196		1,606		—		5,802
Balance at March 31, 2021	$	(43,448)	$	23,777	$	774	$	(18,897)

(1)Amount reclassified from accumulated other comprehensive loss is included in interest expense in the respective consolidated statements of operations. As of March 31, 2021 and December 31, 2020, the deferred net gains from these terminated hedges, which is included in accumulated other comprehensive loss relating to net unrealized loss on derivative instrument, was $(0.6) million and $(0.5) million, respectively.

(2)Amount reclassified from accumulated other comprehensive loss is included in equity in net loss 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.

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

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 March 31, 2021 and December 31, 2020 (in thousands):

	March 31, 2021
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities	$	23,784	$	—	$	23,784	$	—
Interest rate cap and swap agreements (included in Other assets)	$	365	$	—	$	365	$	—
Liabilities:
Interest rate cap and swap agreements (included in Other liabilities)	$	47,033	$	—	$	47,033	$	—

	December 31, 2020
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities	$	28,570	$	—	$	28,570	$	—
Interest rate cap and swap agreements (included in Other assets)	$	28	$	—	$	28	$	—
Liabilities:
Interest rate cap and swap agreements (included in Other liabilities)	$	61,217	$	—	$	61,217	$	—

We evaluate real estate investments and debt and preferred equity investments, including intangibles, for potential impairment 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.

In January 2021, pursuant to the partnership documents of our 885 Third Avenue investment, certain participating rights of the common member expired. As a result, it was determined that this investment is a VIE of which we are the primary beneficiary, and the investment was consolidated in our financial statements. Upon consolidating the entity, the assets and liabilities of the entity were recorded at fair value. This fair value was determined using a third party valuation which primarily utilized 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.

Marketable securities classified as Level 1 are derived from quoted prices in active markets. The valuation technique used to measure the fair value of 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. 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.)

March 31, 2021

(unaudited)

The following table provides the carrying value and fair value of these financial instruments as of March 31, 2021 and December 31, 2020 (in thousands):

	March 31, 2021				December 31, 2020
	Carrying Value (1)		Fair Value		Carrying Value (1)		Fair Value
Debt and preferred equity investments	$	1,097,202	(2)		$	1,076,542	(2)
Fixed rate debt	$	3,932,789	$	4,027,789	$	3,135,572	$	3,237,075
Variable rate debt	1,416,521		1,420,814		1,827,677		1,822,740
	$	5,349,310	$	5,448,603	$	4,963,249	$	5,059,815

(1)Amounts exclude net deferred financing costs.

(2)At March 31, 2021, debt and preferred equity investments had an estimated fair value ranging between $1.0 billion and $1.1 billion. At December 31, 2020, debt and preferred equity investments had an estimated fair value ranging between $1.0 billion and $1.1 billion.

Disclosure about fair value of financial instruments was based on pertinent information available to us as of March 31, 2021 and December 31, 2020. 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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SL Green Realty Corp. and SL Green Operating Partnership, L.P.

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

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 sheet 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 (loss) until the hedged item is 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 March 31, 2021 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 (dollars in thousands).

	Notional Value		Strike Rate		Effective Date	Expiration Date	Balance Sheet Location	Fair Value
Interest Rate Swap	$	350,000	0.544	%	April 2020	August 2021	Other Liabilities	$	(472)
Interest Rate Cap	111,869		3.500	%	December 2020	November 2021	Other Assets	—
Interest Rate Cap	510,000		3.000	%	June 2020	December 2021	Other Assets	—
Interest Rate Swap	200,000		0.138	%	February 2021	February 2022	Other Liabilities	(3)
Interest Rate Swap	100,000		0.136	%	February 2021	February 2022	Other Assets	—
Interest Rate Cap	85,000		4.000	%	March 2021	March 2022	Other Assets	—
Interest Rate Swap	100,000		0.212	%	January 2021	January 2023	Other Assets	95
Interest Rate Swap	400,000		0.160	%	February 2021	February 2023	Other Assets	270
Interest Rate Swap	200,000		1.131	%	July 2016	July 2023	Other Liabilities	(4,017)
Interest Rate Swap	100,000		1.161	%	July 2016	July 2023	Other Liabilities	(2,077)
Interest Rate Swap	150,000		2.696	%	January 2019	January 2024	Other Liabilities	(9,675)
Interest Rate Swap	150,000		2.721	%	January 2019	January 2026	Other Liabilities	(13,117)
Interest Rate Swap	200,000		2.740	%	January 2019	January 2026	Other Liabilities	(17,672)
								$	(46,668)

No gains or losses on the changes in the fair values were included in interest expense in the consolidated statements of operations during the three months ended March 31, 2021 or 2020.

The Company has agreements with each of its derivative counterparties that contain a provision where if the Company defaults on any of its indebtedness, then the Company could also be declared in default on its derivative obligations. As of March 31, 2021, 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 $48.3 million. As of March 31, 2021, the Company had 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 $49.0 million at March 31, 2021.

Gains and losses on terminated hedges are included in accumulated other comprehensive income (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 $16.6 million of the current balance held in accumulated other comprehensive loss will be reclassified into interest expense and $2.2 million of the portion related to

54

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

our share of joint venture accumulated other comprehensive loss will be reclassified into equity in net loss 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 March 31, 2021 and 2020, respectively (in thousands):

	Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)				Location of Loss Reclassified from Accumulated Other Comprehensive Loss into Income	Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income
	Three Months Ended March 31,					Three Months Ended March 31,
Derivative	2021		2020			2021		2020
Interest Rate Swaps/Caps	$	10,220	$	(45,082)	Interest expense	$	(4,388)	$	(725)
Share of unconsolidated joint ventures' derivative instruments	34,955		(7,089)		Equity in net loss from unconsolidated joint ventures	(1,700)		(711)
	$	45,175	$	(52,171)		$	(6,088)	$	(1,436)

The following table summarizes the notional value at inception and fair value of our joint ventures' derivative financial instruments at March 31, 2021 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 (dollars in thousands).

	Notional Value		Strike Rate		Effective Date	Expiration Date	Classification	Fair Value
Interest Rate Swap	$	177,000	1.669	%	March 2016	February 2026	Liability	$	(6,459)
Interest Rate Cap	375,000		2.600	%	August 2018	September 2021	Asset	—
Interest Rate Cap	20,026		2.600	%	April 2019	September 2021	Asset	—
Interest Rate Cap	198,000		4.000	%	August 2019	August 2022	Asset	2
Interest Rate Cap	220,000		4.000	%	February 2020	February 2022	Asset	—
Interest Rate Cap	550,000		3.750	%	August 2020	September 2023	Asset	138
Interest Rate Cap	1,075,000		3.750	%	September 2020	September 2021	Asset	—
Interest Rate Cap	125,000		3.750	%	September 2020	September 2021	Asset	—
Interest Rate Cap	1,250,000		1.250	%	November 2020	October 2024	Asset	5,764
Interest Rate Cap	23,000		4.750	%	January 2021	January 2023	Asset	1
Interest Rate Swap	2,250,000		1.611	%	June 2021	June 2031	Asset	42,635
								$	42,081

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

18. Lease Income

The Operating Partnership is the lessor and the sublessor to tenants under operating and sales-type leases. The minimum rental amounts due under the leases are generally subject to scheduled fixed increases or adjustments. The leases generally also require that the tenants reimburse us for increases in certain operating costs and real estate taxes above their base year costs.

The components of lease income from operating leases during the quarters ended March 31, 2021 and 2020 were as follows (in thousands):

	Three Months Ended March 31,
	2021		2020
Fixed lease payments	$	164,679	$	194,224
Variable lease payments	25,279		27,168
Total lease payments (1)	$	189,958	$	221,392
Amortization of acquired above and below-market leases	(1,869)		1,239
Total rental revenue	$	188,089	$	222,631

(1)Amounts include $65.8 million and $66.3 million of sublease income during the three months ended March 31, 2021 and 2020, respectively.

The components of lease income from sales-type leases during the quarters ended March 31, 2021 and 2020 were as follows (in thousands):

	Three Months Ended March 31,
	2021		2020
Interest income (1)	$	1,101	$	—

(1)These amounts are included in Other income in our consolidated statements of operations.

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

19. Commitments and Contingencies

Legal Proceedings

As of March 31, 2021, 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.

Lease Arrangements

We are a tenant under leases for certain properties, including ground leases. These leases have expirations from 2022 to 2119, or 2043 to 2119 as fully extended. Certain leases offer extension options which we assess against relevant economic factors to determine whether we are reasonably certain of exercising or not exercising the option. Lease payments associated with renewal periods that we are reasonably certain will be exercised, if any, are included in the measurement of the corresponding lease liability and right of use asset.

Certain of our leases are subject to rent resets, generally based on a percentage of the then fair market value, a fixed amount, or a percentage of the preceding rent at specified future dates. Rent resets will be recognized in the periods in which they are incurred.

The table below summarizes our current lease arrangements as of March 31, 2021:

Property (1)	Year of Current Expiration	Year of Final Expiration (2)
1185 Avenue of the Americas	2043	2043
SL Green Headquarters at One Vanderbilt (3)	2043	2048
625 Madison Avenue	2022	2054
420 Lexington Avenue	2050	2080
885 Third Avenue	2080	2080
711 Third Avenue (4)	2033	2083
461 Fifth Avenue (5)	2027	2084
1080 Amsterdam Avenue (6)	2111	2111
15 Beekman (7)(8)	2119	2119

(1)All leases are classified as operating leases unless otherwise specified.

(2)Reflects exercise of all available extension options.

(3)In March 2021, the Company's lease for its corporate headquarters at One Vanderbilt commenced. See note 10, "Related Party Transactions."

(4)The Company owns 50% of the fee interest.

(5)In April 2021, the Company exercised its option to acquire the fee interest in the property. The transaction is expected to close in the second quarter of 2021. The lease is classified as a financing lease.

(6)A portion of the lease is classified as a financing lease.

(7)The Company has an option to purchase the ground lease for a fixed price on a specific date. The lease is classified as a financing lease.

(8)In August 2020, the Company entered into a long-term sublease with an unconsolidated joint venture as part of the capitalization of the 15 Beekman development project. See Note 6, "Investments in Unconsolidated Joint Ventures."

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

The following is a schedule of future minimum lease payments as evaluated in accordance with ASC 842 for our financing leases and operating leases with initial terms in excess of one year as of March 31, 2021 (in thousands):

	Financing leases		Operating leases
Remaining 2021	$	31,136	$	31,954
2022	3,522		29,386
2023	3,570		29,502
2024	3,641		30,545
2025	3,810		30,772
2026	3,858		30,911
Thereafter	256,692		631,532
Total minimum lease payments	$	306,229	$	814,602
Amount representing interest	(153,607)
Amount discounted using incremental borrowing rate			(359,217)
Lease liabilities	$	152,622	$	455,385

The following table provides lease cost information for the Company's operating leases for the three months ended March 31, 2021 or 2020 (in thousands):

	Three Months Ended March 31,
Operating Lease Costs	2021		2020
Operating lease costs before capitalized operating lease costs	$	7,567	$	8,113
Operating lease costs capitalized	(828)		(746)
Operating lease costs, net (1)	$	6,739	$	7,367

(1)This amount is included in operating lease rent in our consolidated statements of operations.

The following table provides lease cost information for the Company's financing leases for the three months ended March 31, 2021 or 2020 (in thousands):

	Three Months Ended March 31,
Financing Lease Costs	2021		2020
Interest on financing leases before capitalized interest	$	1,492	$	1,663
Interest on financing leases capitalized	—		(747)
Interest on financing leases, net (1)	1,492		916
Amortization of right-of-use assets (2)	180		305
Financing lease costs, net	$	1,672	$	1,221

(1)These amounts are included in interest expense, net of interest income in our consolidated statements of operations.

(2)These amounts are included in depreciation and amortization in our consolidated statements of operations.

As of March 31, 2021, the weighted-average discount rate used to calculate the lease liabilities was 4.52%. As of March 31, 2021, the weighted-average remaining lease term was 27 years, inclusive of purchase options expected to be exercised.

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

Notes to Consolidated Financial Statements (cont.)

March 31, 2021

(unaudited)

20. Segment Information

The Company has two reportable segments, real estate and debt and preferred equity investments. We evaluate real estate performance and allocate resources based on earnings contributions.

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 months ended March 31, 2021 and 2020, and selected asset information as of March 31, 2021 and December 31, 2020, regarding our operating segments are as follows (in thousands):

	Real Estate Segment		Debt and Preferred Equity Segment		Total Company
Total revenues
Three months ended:
March 31, 2021	$	206,829	$	19,273	$	226,102
March 31, 2020	275,770		38,533		314,303
Net (loss) income
Three months ended:
March 31, 2021	$	(20,027)	$	16,172	$	(3,855)
March 31, 2020	111,233		15,881		127,114
Total assets
As of:
March 31, 2021	$	10,896,203	$	1,147,842	$	12,044,045
December 31, 2020	10,579,899		1,127,668		11,707,567

Interest costs for the debt and preferred equity segment include actual costs incurred for borrowings on the 2017 MRA and the FHLB Facility. Interest is imputed on the investments that do not collateralize the 2017 MRA and the FHLB Facility using our weighted average 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 because the use of personnel and resources is dependent on transaction volume between the two segments and varies between periods. In addition, we base performance on the individual segments prior to allocating marketing, general and administrative expenses. For the three months ended March 31, 2021, marketing, general and administrative expenses totaled $22.9 million. For the three months ended March 31, 2020, marketing, general and administrative expenses totaled $19.6 million. All other expenses, except interest, relate entirely to the real estate assets.

There were no transactions between the above two segments.

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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, engaged in the acquisition, development, ownership, management and operation of commercial and residential real estate properties, principally office properties, located in the New York metropolitan area. 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.

The following discussion related to our consolidated financial statements should be read in conjunction with the financial statements appearing in this Quarterly Report on this Form 10-Q and in Item 8 of our Annual Report on Form 10-K for the year ended December 31, 2020.

As of March 31, 2021, we owned the following interests in properties in the New York metropolitan area, primarily in midtown Manhattan. Our investments located outside of Manhattan are referred to as the Suburban properties:

			Consolidated		Unconsolidated		Total
Location	Property Type		Number of Buildings	Approximate Square Feet (unaudited)	Number of Buildings	Approximate Square Feet (unaudited)	Number of Buildings	Approximate Square Feet (unaudited)	Weighted Average Occupancy(1) (unaudited)
Commercial:
Manhattan	Office		18	10,526,345	9	10,869,183	27	21,395,528	93.4	%
	Retail		1	10,040	9	301,996	10	312,036	94.6	%
	Development/Redevelopment	(1)	9	1,890,614	3	2,927,782	12	4,818,396	N/A
			28	12,426,999	21	14,098,961	49	26,525,960	93.5	%
Suburban	Office		7	862,800	—	—	7	862,800	81.6	%
Total commercial properties			35	13,289,799	21	14,098,961	56	27,388,760	93.0	%
Residential:
Manhattan	Residential		1	82,250	8	1,663,774	9	1,746,024	79.1	%
Total portfolio			36	13,372,049	29	15,762,735	65	29,134,784	92.2	%

(1)The weighted average occupancy for commercial properties represents the total occupied square footage divided by the total square footage at acquisition. The weighted average occupancy for residential properties represents the total occupied units divided by the total available units. Properties under construction are not included in the calculation of weighted average occupancy.

As of March 31, 2021, we also managed two office buildings owned by third parties encompassing approximately 2.1 million square feet (unaudited), and held debt and preferred equity investments with a book value of $1.1 billion, excluding $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.

Critical Accounting Policies

Refer to the 2020 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, lease classification, revenue recognition, and debt and preferred equity investments. During the three months ended March 31, 2021, there were no material changes to these policies.

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Results of Operations

The COVID-19 pandemic has caused, and continues to cause, severe disruptions with wide ranging impacts to the global economy and everyday life. Our business, results of operations, liquidity, cash flows, prospects, and our ability to achieve forward-looking targets and expectations could be materially and adversely affected for at least the duration of the COVID-19 pandemic and likely longer. This could also cause significant volatility in the trading prices of our securities. The extent of the impact of the COVID-19 pandemic will depend on future developments, including the duration, severity and spread of the pandemic, health and safety actions taken to contain its spread including vaccination efforts, and how quickly and to what extent normal economic and operating conditions can resume. Additionally, the COVID-19 pandemic could increase the magnitude of many of the other risks described in our latest Annual Report on Form 10-K and our other SEC filings and may have other adverse effects on our operations that we are not currently able to predict.

Comparison of the three months ended March 31, 2021 to the three months ended March 31, 2020

The following comparison for the three months ended March 31, 2021, or 2021, to the three months ended March 31, 2020, or 2020, makes reference to the effect of the following:

i.“Same-Store Properties,” which represents all operating properties owned by us at January 1, 2020 and still owned by us in the same manner at March 31, 2021 (Same-Store Properties totaled 25 of our 36 consolidated operating buildings),

ii.“Acquisition Properties,” which represents all properties or interests in properties acquired in 2021 and 2020 and all non-Same-Store Properties, including properties that are under development or redevelopment,

iii."Disposed Properties," which represents all properties or interests in properties sold in 2021 and 2020, and

iv.“Other,” which represents properties where we sold an interest resulting in deconsolidation and corporate level items not allocable to specific properties, as well as the Service Corporation and eEmerge Inc.

	Same-Store								Disposed				Other				Consolidated
(in millions)	2021		2020		$ Change		% Change		2021		2020		2021		2020		2021		2020		$ Change		% Change
Rental revenue	$	161.7	$	173.7	$	(12.0)	(6.9)	%	$	0.4	$	16.1	$	26.0	$	32.8	$	188.1	$	222.6	$	(34.5)	(15.5)	%
Investment income	—		—		—		—	%	—		—		19.3		38.5		19.3		38.5		(19.2)		(49.9)	%
Other income	—		0.4		(0.4)		(100.0)	%	—		—		18.7		52.7		18.7		53.1		(34.4)		(64.8)	%
Total revenues	161.7		174.1		(12.4)		(7.1)	%	0.4		16.1		64.0		124.0		226.1		314.2		(88.1)		(28.0)	%
Property operating expenses	76.1		81.5		(5.4)		(6.6)	%	0.1		7.6		18.2		18.8		94.4		107.9		(13.5)		(12.5)	%
Marketing, general and administrative	—		—		—		—	%	—		—		22.9		19.6		22.9		19.6		3.3		16.8	%
	76.1		81.5		(5.4)		(6.6)	%	0.1		7.6		41.1		38.5		117.4		127.4		(10.3)		(8.1)	%
Other income (expenses):
Interest expense and amortization of deferred financing costs, net of interest income																	(27.2)		(40.0)		12.8		(32.0)	%
Depreciation and amortization																	(63.0)		(68.3)		5.3		(7.8)	%
Equity in net loss from unconsolidated joint ventures																	(2.9)		(12.8)		9.9		(77.3)	%
Equity in net loss on sale of interest in unconsolidated joint venture/real estate																	(12.6)		—		(12.6)		100.0	%
Purchase price and other fair value adjustments																	2.7		—		2.7		100.0	%
(Loss) gain on sale of real estate, net																	(1.4)		72.6		(74.0)		(101.9)	%
Depreciable real estate reserves and impairment																	(8.2)		—		(8.2)		100.0	%
Loan loss and other investment reserves, net of recoveries																	—		(11.2)		11.2		(100.0)	%
Net (loss) income																	$	(3.9)	$	127.1	$	(131.0)	(103.1)	%

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Rental Revenue

Rental revenues decreased primarily due to a) our Disposed Properties ($15.7 million), b) One Madison Avenue being vacated in the first quarter of 2020 pursuant to the property's redevelopment ($5.0 million), and c) lower contribution from our Same-Store properties ($12.0 million) driven by increased vacancy at 1185 Avenue of the Americas ($4.1 million) and 485 Lexington Avenue ($2.6 million).

The following table presents a summary of the commenced leasing activity for the three months ended March 31, 2021 in our Manhattan portfolio:

	Usable 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	1,717,735
Sold Vacancies	(28,174)
Properties in redevelopment	(257,789)
Space which became available during the period (3)
•       Office	344,790
•       Retail	44,808
	389,598
Total space available	1,821,370
Leased space commenced during the period:
•       Office(4)	367,579	387,375	$	69.12	$	66.37	$	91.94	7.6	10.4
•       Retail	39,251	38,063	$	38.51	$	68.42	$	—	—	10.2
Total leased space commenced	406,830	425,438	$	66.38	$	66.75	$	83.71	6.9	10.3
Total available space at end of period	1,414,540
Early renewals
•       Office	121,026	121,432	$	53.72	$	51.82	$	0.18	1.0	1.0
•       Retail	36,649	63,679	$	92.63	$	80.66	$	—	0.6	4.9
Total early renewals	157,675	185,111	$	67.11	$	61.74	$	0.12	0.9	2.4
Total commenced leases, including replaced previous vacancy
•       Office		508,807	$	65.44	$	60.33	$	70.04	6.0	8.1
•       Retail		101,742	$	72.39	$	76.08	$	—	0.4	6.9
Total commenced leases		610,549	$	66.60	$	64.40	$	58.37	2.5	7.9

(1)Annual initial base rent.

(2)Escalated rent includes base rent plus all additional amounts paid by the tenant in the form of real estate taxes, operating expenses, porters wage or a consumer price index (CPI) adjustment.

(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 $58.70 per rentable square feet for 171,193 rentable square feet. Average starting office rent for office space (leased and early renewals, excluding new tenants replacing vacancies) was $56.64 per rentable square feet for 292,625 rentable square feet.

Investment Income

For the three months ended March 31, 2021, investment income decreased primarily as a result of a decrease in the weighted average balance and weighted average yield of our debt and preferred equity investments. For the three months ended March 31, 2021 and 2020, the weighted average debt and preferred equity investment balance outstanding and weighted average yield were $1.1 billion and 6.8% compared to $1.8 billion and 8.3%, respectively.

Other Income

Other income decreased primarily due to the receipt of incremental income from Credit Suisse at One Madison Avenue in the first quarter of 2020 ($45.2 million), compared to lease termination income in the first quarter of 2021 ($9.9 million).

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Property Operating Expenses

Property operating expenses decreased primarily due to a reduction in variable operating expenses, such as utilities, cleaning, and security, at our Same-Store properties ($6.5 million) as a result of lower physical occupancy at the properties during the first quarter of 2021 related to COVID-19 and decreased operating expenses and real estate taxes at our Disposed properties ($3.6 million and $3.7 million, respectively).

Marketing, General and Administrative Expenses

Marketing, general and administrative expenses increased to $22.9 million for the three months ended March 31, 2021, compared to $19.6 million for the same period in 2020 due to an increase in share-based compensation expense as a result of stock price volatility.

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 lower interest expense from senior unsecured notes ($5.4 million), the 2017 revolving credit facility ($4.5 million) and term loans ($3.4 million) resulting from a decrease in the average LIBOR rate during the three months ended March 31, 2021 compared to the three months ended March 31, 2020. The weighted average consolidated debt balance outstanding was $5.4 billion for the three months ended March 31, 2021, compared to $6.1 billion for the three months ended March 31, 2020. The consolidated weighted average interest rate was 2.88% for the three months ended March 31, 2021, as compared to 3.62% for the three months ended March 31, 2020.

Depreciation and Amortization

Depreciation and amortization decreased due to depreciation and amortization at our Same Store properties ($6.7 million) and Disposed properties ($2.7 million), partially offset by the increased depreciation and amortization at our Acquired properties ($5.0 million).

Equity in Net Loss from Unconsolidated Joint Ventures

Equity in net loss from unconsolidated joint ventures decreased primarily as a result of lower depreciation expense at certain unconsolidated joint venture properties ($6.7 million).

Equity in net loss on sale of interest in unconsolidated joint venture/real estate

During the three months ended March 31, 2021, we recognized a loss on sale related to our interests in 55 West 46th Street ($15.2 million). During the three months ended March 31, 2020, we did not sell any joint venture interests or properties.

Purchase price and other fair value adjustments

During the three months ended March 31, 2021, we recorded $2.7 million of purchase price and other fair value adjustments related to One Madison Avenue. During the three months ended March 31, 2020, we did not record any purchase price and other fair value adjustments.

(Loss) gain on sale of real estate, net

During the three months ended March 31, 2021, we recognized a loss on sale related to our interest in 712 Madison Avenue ($1.4 million). During the three months ended March 31, 2020, we recognized a gain on sale related to our interest in 315 West 33rd Street ("The Olivia") ($72.3 million).

Depreciable real estate reserves and impairment

During the three months ended March 31, 2021, we recognized depreciable real estate reserves and impairments related to a) 400 East 57th Street ($5.7 million), and b) 106 Spring Street ($2.7 million), as offset by c) 133 Greene Street ($0.2 million). During the three months ended March 31, 2020, we did not record any recognize any depreciable real estate reserves.

Loan loss and other investment reserves, net of recoveries

During the three months ended March 31, 2021 we did not recognize any loan loss and other investment reserves. During the three months ended March 31, 2020, we recorded $11.2 million of loan loss and other investment reserves in conjunction with recording debt and preferred equity investments and other financing receivables at the net amount expected to be collected.

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, share repurchases, dividends to shareholders, distributions to unitholders, repurchases or repayments of outstanding indebtedness and for debt and preferred equity investments will include:

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(1)Cash flow from operations;

(2)Cash on hand;

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

(4)Borrowings under the revolving credit facility;

(5)Other forms of secured or unsecured financing; and

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

Cash flow from operations is primarily dependent upon the collectability of rent, 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.

As of the date of this filing, we have collected gross tenant billings for the first quarter of 2021 of 96.9% overall, including 98.9% from office tenants and 90.9% from retail tenants.

The combined aggregate principal maturities of our property mortgages and other loans payable, Master Repurchase Agreement ("MRA"), corporate obligations and our share of joint venture debt, including as-of-right extension options, as of March 31, 2021 were as follows (in thousands):

	Remaining 2021		2022		2023		2024		2025		Thereafter		Total
Property mortgages and other loans	$	176,901	$	264,200	$	566,594	$	278,029	$	823	$	581,116	$	1,867,663
MRA	—		—		—		—		—		—		—
Corporate obligations	350,000		800,000		1,930,000		200,000		100,000		100,000		3,480,000
Joint venture debt-our share	1,126,896		227,701		491,066		620,843		1,403,266		552,813		4,422,585
Total	$	1,653,797	$	1,291,901	$	2,987,660	$	1,098,872	$	1,504,089	$	1,233,929	$	9,770,248

As of March 31, 2021, we had liquidity of $1.2 billion, comprised of $0.9 billion of availability under our revolving credit facility and $0.3 billion of consolidated cash on hand, inclusive of $23.8 million of marketable securities. This liquidity excludes $96.2 million representing our share of cash at unconsolidated joint venture properties. We may seek to divest of properties, interests in properties or debt and preferred equity investments 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 and unsecured debt, will allow us to satisfy our debt obligations, as described above, upon maturity, if not before.

We 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.

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Cash, restricted cash, and cash equivalents were $401.6 million and $621.0 million at March 31, 2021 and 2020, respectively, representing a decrease of $219.4 million. The decrease was a result of the following changes in cash flows (in thousands):

	Three Months Ended March 31,
	2021		2020		Change
Net cash provided by operating activities	$	18,602	$	42,026	$	(23,424)
Net cash provided by (used in) investing activities	$	20,181	$	(129,418)	$	149,599
Net cash (used in) provided by financing activities	$	(9,971)	$	466,984	$	(476,955)

Our principal sources of operating cash flow are the properties in our consolidated and joint venture portfolios and our debt and preferred equity portfolio. These sources generate a relatively consistent stream of cash flow that provides us with resources to pay operating expenses, debt service and fund dividend and distribution requirements.

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 three months ended March 31, 2021, when compared to the three months ended March 31, 2020, we used cash primarily for the following investing activities (in thousands):

Acquisitions of real estate	$	86,846
Capital expenditures and capitalized interest	52,398
Joint venture investments	(12,121)
Distributions from joint ventures	(33,824)
Proceeds from sales of real estate/partial interest in property	(28,356)
Debt and preferred equity and other investments	75,181
Increase in net cash provided by investing activities	$	140,124

Funds spent on capital expenditures, which are comprised of building and tenant improvements, decreased from $101.7 million for the three months ended March 31, 2020 to $49.3 million for the three months ended March 31, 2021 due to decreased spending on development and redevelopment projects.

We generally fund our investment activity through the sale of real estate, the sale of debt and preferred equity investments, property-level financing, our credit facilities, senior unsecured notes, and construction loans. From time to time, the Company may issue common or preferred stock, or the Operating Partnership may issue common or preferred units of limited partnership interest.

During the three months ended March 31, 2021, when compared to the three months ended March 31, 2020, we used cash for the following financing activities (in thousands):

Proceeds from our debt obligations	$	(685,712)
Repayments of our debt obligations	45,235
Net distribution to noncontrolling interests	(6,125)
Other financing activities	6,788
Proceeds from stock options exercised and DRSPP issuance	185
Repurchase of common stock	135,487
Redemption of preferred stock	15,761
Acquisition of subsidiary interest from noncontrolling interest	1,536
Dividends and distributions paid	9,890
Decrease in net cash provided by financing activities	$	(476,955)

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 March 31, 2021, 69,353,606 shares of common stock and no shares of excess stock were issued and outstanding.

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On December 4, 2020 our Board of Directors declared an ordinary dividend and a special dividend (together, "the Total Dividend"). The Total Dividend was paid on January 15, 2021 to shareholders of record at the close of business on December 15, 2020 ("the Record Date"). Shareholders had the opportunity to elect to receive the Total Dividend in the form of all cash or all stock, subject to proration if either option was oversubscribed. Shareholders who elected to receive cash received, for each share of common stock they owned as of the Record Date, approximately $0.3735 in cash and 0.0279 shares of common stock. Shareholders who elected to receive shares received, for each share of common stock they owned as of the Record Date, approximately 0.0343 shares of common stock. The number of shares issued was calculated based on the volume weighted average trading price of SLG's common stock between January 5-7, 2021, of $58.15 per share.

To mitigate the dilutive impact of the common stock issued in the special dividend, the board of directors also authorized a reverse stock split, which was effective after markets closed on January 20, 2021. On January 8, 2021, a committee of the Board of Directors calculated the ratio for the reverse stock split of our issued and outstanding shares of common stock as 1.02918-for-1. After the issuance of the dividend and the completion of the reverse stock split, the number of shares of our common stock outstanding was equivalent to the number of total shares outstanding on the Record Date (not including any issuances or repurchases that occurred following the Record Date, as well as any fractional shares that would have been issued but for which cash-in-lieu was paid). However, on a relative basis, some individual shareholders may have more shares of SLG’s common stock, and some individual shareholders may have fewer shares of our common stock, depending on their individual elections to receive cash or stock and as a result of the cash option being oversubscribed.

All share-related references and measurements including the number of shares outstanding, share prices, number of shares repurchased, earnings per share, dividends per share, and share-based compensation awards, have been retroactively adjusted to reflect the reverse stock split for all periods presented in this Quarterly Report on Form 10-Q.

Share Repurchase Program

In August 2016, our Board of Directors approved a $1.0 billion share repurchase program under which we can buy shares of our common stock. The Board of Directors has since authorized five separate $500.0 million increases to the size of the share repurchase program in the fourth quarter of 2017, second quarter of 2018, fourth quarter of 2018, fourth quarter of 2019, and fourth quarter of 2020 bringing the total program size to $3.5 billion.

At March 31, 2021, share repurchases, excluding the redemption of OP units, executed under the program were as follows:

Period	Shares repurchased	Average price paid per share	Cumulative number of shares repurchased as part of the repurchase plan or programs
Year ended 2017	8,105,881	$104.61	8,105,881
Year ended 2018	9,468,617	$99.03	17,574,498
Year ended 2019	4,465,857	$86.06	22,040,355
Year Ended 2020	8,529,279	$62.39	30,569,634
Three Months Ended March 31, 2021	1,306,460	$61.46	31,876,094

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Dividend Reinvestment and Stock Purchase Plan ("DRSPP")

The following table summarizes SL Green common stock issued, and proceeds received from dividend reinvestments and/or stock purchases under the DRSPP for the three months ended March 31, 2021 and 2020, respectively (dollars in thousands):

	Three Months Ended March 31,
	2021		2020
Shares of common stock issued	5,483		1,727
Dividend reinvestments/stock purchases under the DRSPP	$	351	$	166

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 2005 Plan. As of March 31, 2021, 1.9 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.

Deferred Compensation Plan for Directors

During the three months ended March 31, 2021, 18,290 phantom stock units and 12,064 shares of common stock were issued to our board of directors. We recorded compensation expense of $1.8 million during the three months ended March 31, 2021 related to the Deferred Compensation Plan. We recorded compensation expense of $1.8 million during the three months ended March 31, 2020 related to the Deferred Compensation Plan.

As of March 31, 2021, there were 159,066 phantom stock units outstanding pursuant to our Non-Employee Director's Deferral Program.

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Indebtedness

The table below summarizes our consolidated mortgages and other loans payable, 2017 credit facility, senior unsecured notes and trust preferred securities outstanding at March 31, 2021 and December 31, 2020, (amounts in thousands).

Debt Summary:	March 31, 2021			December 31, 2020
Balance
Fixed rate	$	1,982,789		$	1,985,572
Variable rate—hedged	1,950,000			1,150,000
Total fixed rate	3,932,789			3,135,572
Total variable rate	1,416,521			1,827,677
Total debt	$	5,349,310		$	4,963,249
Debt, preferred equity, and other investments subject to variable rate	352,650			345,877
Net exposure to variable rate debt	1,063,871			1,481,800
Percent of Total Debt:
Fixed rate	73.5		%	63.2		%
Variable rate (1)	26.5		%	36.8		%
Total	100.0		%	100.0		%
Effective Interest Rate for the Year:
Fixed rate	3.09		%	3.65		%
Variable rate	2.18		%	2.30		%
Effective interest rate	2.88		%	2.91		%

(1)    Inclusive of the mitigating effect of our debt, preferred equity, and other investments subject to variable rate, the percent of total debt of our net exposure to variable rate debt was 21.3% and 32.1% as of March 31, 2021 and December 31, 2020, respectively.

The variable rate debt shown above generally bears interest at an interest rate based on 30-day LIBOR (0.11% and 0.14% at March 31, 2021 and December 31, 2020, respectively). Our consolidated debt at March 31, 2021 had a weighted average term to maturity of 2.54 years.

Certain of our debt and equity investments and other investments, with carrying values of $0.4 billion at March 31, 2021 and $0.3 billion at December 31, 2020, are variable rate investments which mitigate our exposure to interest rate changes on our unhedged variable rate debt. Inclusive of the mitigating effect of these investments, the net percent of our variable rate debt to total debt was 21.3% and 32.1%, respectively.

2017 Credit Facility

    In November 2017, we entered into an amendment to the credit facility, referred to as the 2017 credit facility, that was originally entered into by the Company in November 2012, or the 2012 credit facility. As of March 31, 2021, the 2017 credit facility consisted of a $1.5 billion revolving credit facility, a $1.3 billion term loan (or "Term Loan A"), and a $200.0 million term loan (or "Term Loan B") with maturity dates of March 31, 2022, March 31, 2023, and November 21, 2024, respectively. The revolving credit facility has two six-month as-of-right extension options to March 31, 2023. We also have an option, subject to customary conditions, to increase the capacity of the credit facility to $4.5 billion at any time prior to the maturity dates for the revolving credit facility and term loans without the consent of existing lenders, by obtaining additional commitments from our existing lenders and other financial institutions.

As of March 31, 2021, the 2017 credit facility bore interest at a spread over 30-day LIBOR ranging from (i) 82.5 basis points to 155 basis points for loans under the revolving credit facility, (ii) 90 basis points to 175 basis points for loans under Term Loan A, and (iii) 85 basis points to 165 basis points for loans under Term Loan B, in each case based on the credit rating assigned to the senior unsecured long term indebtedness of the Company. In instances where there are either only two ratings available or where there are more than two and the difference between them is one rating category, the applicable rating shall be the highest rating. In instances where there are more than two ratings and the difference between the highest and the lowest is two or more rating categories, then the applicable rating used is the average of the highest two, rounded down if the average is not a recognized category.

At March 31, 2021, the applicable spread was 100 basis points for the revolving credit facility, 110 basis points for Term Loan A, and 100 basis points for Term Loan B. We are required to pay quarterly in arrears a 12.5 to 30 basis point facility fee

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on the total commitments under the revolving credit facility based on the credit rating assigned to the senior unsecured long term indebtedness of the Company. As of March 31, 2021, the facility fee was 20 basis points.

As of March 31, 2021, we had $16.5 million of outstanding letters of credit, $630.0 million drawn under the revolving credit facility and $1.5 billion outstanding under the term loan facilities, with total undrawn capacity of $0.9 billion under the 2017 credit facility. At March 31, 2021 and December 31, 2020, the revolving credit facility had a carrying value of $625.8 million and $105.3 million, respectively, net of deferred financing costs. At March 31, 2021 and December 31, 2020, the term loan facilities had a carrying value of $1.5 billion and $1.5 billion, respectively, net of deferred financing costs.

The Company and the Operating Partnership are borrowers jointly and severally obligated under the 2017 credit facility.

The 2017 credit facility includes certain restrictions and covenants (see Restrictive Covenants below).

Restrictive Covenants

The terms of the 2017 credit facility 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 March 31, 2021 and December 31, 2020, 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. Based on the debt outstanding as of March 31, 2021, a hypothetical 100 basis point increase in the floating rate interest rate curve would increase our consolidated annual interest cost, net of interest income from variable rate debt and preferred equity investments, by $10.0 million and would increase our share of joint venture annual interest cost by $20.8 million. At March 31, 2021, 32.1% of our $1.1 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.

Our long-term debt of $3.9 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 March 31, 2021 bore interest based on a spread of LIBOR plus 100 basis points to LIBOR plus 340 basis points.

Contractual Obligations

Refer to our 2020 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 months ended March 31, 2021.

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. A majority 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, 2021, we expect to incur $75.0 million of recurring capital expenditures on existing consolidated properties and $174.6 million of development or redevelopment expenditures on existing consolidated properties, of which $56.0 million will be funded by construction financing facilities. We expect our share of capital expenditures at our joint venture properties will be $220.0 million, of which $185.9 million will be funded by construction financing facilities. We expect to fund capital expenditures from operating cash flow, existing liquidity, and borrowings from construction financing facilities. Future property acquisitions may require substantial capital investments for refurbishment and leasing costs.

Dividends/Distributions

We expect to pay cash dividends to our stockholders based on the distributions we receive from our Operating Partnership, which are generated by the collection of property revenues, net of operating expenses, and interest on our debt and preferred equity portfolio.

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.

Any dividend we pay may be in the form of cash, stock or a combination thereof, subject to IRS limitations on the use of stock for dividends. Additionally, if our REIT taxable income in a particular year exceeds the amount of cash dividends we pay in that year, we may pay stock dividends in order to maintain our REIT status and avoid certain REIT-level taxes.

Before we pay any cash dividend, whether for Federal income tax purposes or otherwise, which would only be paid out of available cash to the extent permitted under the 2017 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. Separate property and liability coverage may be purchased on a stand-alone basis for certain assets, such as development projects. Additionally, one of our captive insurance companies, Belmont Insurance Company, or Belmont, provides coverage for NBCR terrorist acts above a specified trigger. Belmont's retention is reinsured by our other captive insurance company, Ticonderoga Insurance Company ("Ticonderoga"). If Belmont or Ticonderoga are required to pay a claim under our insurance policies, we would ultimately record the loss to the extent of required payments. However, there is no assurance that in the future we will be able to procure coverage at a reasonable cost. Further, if we experience losses that are uninsured or that exceed policy limits, we could lose the capital invested in the damaged properties as well as the anticipated future cash flows from those properties. Additionally, our debt instruments contain customary covenants requiring us to maintain insurance and we could default under our debt instruments if the cost and/or availability of certain types of insurance make it impractical or impossible to comply with such covenants relating to insurance. Belmont and Ticonderoga provide coverage solely on properties owned by the Company or its affiliates.

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.

Funds from Operations

FFO is a widely recognized non-GAAP financial measure of REIT performance. The Company computes FFO in accordance with standards established by 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 in December 2018, defines FFO as net income (loss) (computed in accordance with GAAP), excluding gains (or losses) from sales of properties and real estate related impairment charges, plus real estate related depreciation and amortization and after adjustments for unconsolidated partnerships and joint ventures.

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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 compensation 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 real estate related impairment charges, 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 months ended March 31, 2021 and 2020 are as follows (in thousands):

	Three Months Ended March 31,
	2021		2020
Net (loss) income attributable to SL Green common stockholders	$	(7,464)	$	114,801
Add:
Depreciation and amortization	62,996		68,279
Joint venture depreciation and noncontrolling interest adjustments	55,702		56,318
Net (loss) income attributable to noncontrolling interests	(1,975)		5,909
Less:
Equity in net loss on sale of interest in unconsolidated joint venture/real estate	(12,629)		—
Depreciable real estate reserves and impairment	(8,241)		—
(Loss) gain on sale of real estate, net	(1,388)		72,636
Purchase price and other fair value adjustments	2,664		—
Depreciation on non-rental real estate assets	527		650
Funds from Operations attributable to SL Green common stockholders	$	128,326	$	172,021
Cash flows provided by operating activities	$	18,602	$	42,026
Cash flows provided by (used in) investing activities	$	20,181	$	(129,418)
Cash flows (used in) provided by financing activities	$	(9,971)	$	466,984

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 CPI 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.

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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 New York metropolitan area 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;

•the effect of the on-going COVID-19 pandemic and the duration of the impact it will have on our business and the industry as a whole;

•dependence upon certain geographic markets;

•risks of real estate acquisitions, dispositions, development 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 or borrowers;

•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 our 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.

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. Except to the extent required by law, 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 months ended March 31, 2021 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, 2020 for the Company and the Operating Partnership. Our exposures to market risk have not changed materially since December 31, 2020.

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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 March 31, 2021 that have materially affected, or are 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 March 31, 2021 that have materially affected, or are 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 March 31, 2021, 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 March 31, 2021 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, 2020.

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

In August 2016, our Board of Directors approved a $1.0 billion share repurchase program under which we can buy shares of our common stock. The Board of Directors has since authorized five separate $500.0 million increases to the size of the share repurchase program in the fourth quarter of 2017, second quarter of 2018, fourth quarter of 2018, fourth quarter of 2019, and fourth quarter of 2020 bringing the total program size to $3.5 billion.

At March 31, 2021, share repurchases, excluding the redemption of OP units, executed under the program were as follows:

Period	Shares repurchased 1	Average price paid per share 1	Total number of shares repurchased as part of the repurchase plan or programs 1
Year ended 2017	8,105,881	$104.61	8,105,881
Year ended 2018	9,468,617	$99.03	17,574,498
Year ended 2019	4,465,857	$86.06	22,040,355
Year Ended 2020	8,529,279	$62.39	30,569,634
Three months ended March 31, 2021	1,306,460	$61.46	31,876,094

(1)Retroactively adjusted to reflect the reverse stock split completed in January 2021.

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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 Chairman and 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 Chairman and 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 Chairman and 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 Chairman and 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	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 quarter ended March 31, 2021, formatted in Inline XBRL: (i) Consolidated Balance Sheets (unaudited), (ii) Consolidated Statements of Operations (unaudited), (iii) Consolidated Statements of Comprehensive Income (unaudited), (iv) Consolidated Statements of Equity (unaudited), (v) Consolidated Statements of Capital (unaudited) (vi) Consolidated Statements of Cash Flows (unaudited), and (vii) Notes to Consolidated Financial Statements (unaudited), detail tagged and filed herewith.
104	Cover Page Interactive Data File (formatted as Inline XBRL in Exhibit 101)

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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: May 10, 2021	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/ Marc Holliday	Chairman of the Board of Directors and Chief Executive Officer and Director of SL Green, the sole general partner of the Operating Partnership (Principal Executive Officer)	May 10, 2021
Marc Holliday
/s/ Andrew W. Mathias	President and Director of SL Green, the sole general partner of the Operating Partnership	May 10, 2021
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)	May 10, 2021
Matthew J. DiLiberto
/s/ Stephen L. Green	Director of SL Green, the sole general partner of the Operating Partnership	May 10, 2021
Stephen L. Green
/s/ John H. Alschuler, Jr.	Director of SL Green, the sole general partner of the Operating Partnership	May 10, 2021
John H. Alschuler, Jr.
/s/ Edwin T. Burton, III	Director of SL Green, the sole general partner of the Operating Partnership	May 10, 2021
Edwin T. Burton, III
/s/ John S. Levy	Director of SL Green, the sole general partner of the Operating Partnership	May 10, 2021
John S. Levy
/s/ Craig M. Hatkoff	Director of SL Green, the sole general partner of the Operating Partnership	May 10, 2021
Craig M. Hatkoff
/s/ Betsy S. Atkins	Director of SL Green, the sole general partner of the Operating Partnership	May 10, 2021
Betsy S. Atkins
/s/ Lauren B. Dillard	Director of SL Green, the sole general partner of the Operating Partnership	May 10, 2021
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: May 10, 2021		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: May 10, 2021
	/s/ Marc Holliday
Name:	Marc Holliday
Title:	Chairman and 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: May 10, 2021
	/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: May 10, 2021
	/s/ Marc Holliday
Name:	Marc Holliday
Title:	Chairman and 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.

Date: May 10, 2021
	/s/ Matthew J. DiLiberto
Name:	Matthew J. DiLiberto
Title:	Chief Financial Officer
	of SL Green Realty Corp., the
	general partner of the registrant

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, Chairman and 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:	Chairman and Chief Executive Officer
May 10, 2021

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
May 10, 2021

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, Chairman and 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:	Chairman and Chief Executive Officer
	of SL Green Realty Corp., the
	general partner of the Operating Partnership
May 10, 2021

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
May 10, 2021

XML

Cover Page - shares	3 Months Ended
	Mar. 31, 2021	May 07, 2021
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	1-13199
Entity Registrant Name	SL GREEN REALTY CORP
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	13-3956775
Entity Address, Address Line One	One Vanderbilt Avenue
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10017
City Area Code	212
Local Phone Number	594-2700
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		69,353,968
Entity Central Index Key	0001040971
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Amendment Flag	false
Former Address
Document Information [Line Items]
Entity Address, Address Line One	420 Lexington Avenue
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10170
Common Stock
Document Information [Line Items]
Trading Symbol	SLG
Title of 12(b) Security	Common Stock, $0.01 par value
Security Exchange Name	NYSE
Preferred Stock
Document Information [Line Items]
Trading Symbol	SLG.PRI
Title of 12(b) Security	6.500% Series I Cumulative Redeemable Preferred Stock, $0.01 par value
Security Exchange Name	NYSE
SL Green Operating Partnership
Document Information [Line Items]
Entity File Number	33-167793-02
Entity Registrant Name	SL GREEN OPERATING PARTNERSHIP, L.P.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	13-3960938
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		1,025,366
Entity Central Index Key	0001492869
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Amendment Flag	false

XML

Consolidated Balance Sheets - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Commercial real estate properties, at cost:
Land and land interests		$ 1,445,199	$ 1,315,832
Building and improvements		4,096,930	4,168,193
Building leasehold and improvements		1,730,418	1,448,134
Right of use asset - financing leases		55,711	55,711
Right of use asset - operating leases		502,316	367,209
Total commercial real estate properties, at cost		7,830,574	7,355,079
Less: accumulated depreciation		(2,004,945)	(1,956,077)
Total commercial real estate properties, net		5,825,629	5,399,002
Cash and cash equivalents		304,999	266,059
Restricted cash		96,608	106,736
Investments in marketable securities		23,784	28,570
Tenant and other receivables		42,505	44,507
Related party receivables		34,310	34,657
Deferred rents receivable		304,420	302,791
Debt and preferred equity investments, net of discounts and deferred origination fees of $9,817 and $11,232 and allowances of $13,213 and $13,213 in 2021 and 2020, respectively		1,097,202	1,076,542
Investments in unconsolidated joint ventures		3,698,701	3,823,322
Deferred costs, net		170,252	177,168
Other assets		445,635	448,213
Total assets	[1]	12,044,045	11,707,567
Liabilities
Mortgages and other loans payable, net		1,848,701	1,979,972
Revolving credit facility, net		625,809	105,262
Unsecured term loans, net		1,495,620	1,495,275
Unsecured notes, net		1,248,622	1,248,219
Accrued interest payable		22,796	14,825
Other liabilities		267,908	302,798
Accounts payable and accrued expenses		120,015	151,309
Deferred revenue		119,215	118,572
Lease liability - financing leases		152,622	152,521
Lease liability - operating leases		455,385	339,458
Dividend and distributions payable		24,924	149,294
Security deposits		54,181	53,836
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities		100,000	100,000
Total liabilities	[1]	6,535,798	6,211,341
Commitments and contingencies
Noncontrolling interests in Operating Partnership		374,124	358,262
Preferred units		198,503	202,169
Equity
Series I Preferred Stock, $0.01 par value, $25.00 liquidation preference, 9,200 issued and outstanding at both March 31, 2021 and December 31, 2020		221,932	221,932
Common stock, $0.01 par value, 160,000 shares authorized and 70,380 and 69,534 issued and outstanding at March 31, 2021 and December 31, 2020, respectively (including 1,026 and 1,026 shares held in treasury at March 31, 2021 and December 31, 2020, respectively)		705	716
Additional paid-in-capital		3,913,258	3,862,949
Treasury stock at cost		(124,049)	(124,049)
Accumulated other comprehensive loss		(18,897)	(67,247)
Retained earnings		918,077	1,015,462
Total SL Green stockholders' equity		4,911,026	4,909,763
Noncontrolling interests in other partnerships		24,594	26,032
Total equity		4,935,620	4,935,795
SL Green stockholders equity:
Total liabilities and equity/capital		12,044,045	11,707,567
SL Green Operating Partnership
Commercial real estate properties, at cost:
Land and land interests		1,445,199	1,315,832
Building and improvements		4,096,930	4,168,193
Building leasehold and improvements		1,730,418	1,448,134
Right of use asset - financing leases		55,711	55,711
Right of use asset - operating leases		502,316	367,209
Total commercial real estate properties, at cost		7,830,574	7,355,079
Less: accumulated depreciation		(2,004,945)	(1,956,077)
Total commercial real estate properties, net		5,825,629	5,399,002
Cash and cash equivalents		304,999	266,059
Restricted cash		96,608	106,736
Investments in marketable securities		23,784	28,570
Tenant and other receivables		42,505	44,507
Related party receivables		34,310	34,657
Deferred rents receivable		304,420	302,791
Debt and preferred equity investments, net of discounts and deferred origination fees of $9,817 and $11,232 and allowances of $13,213 and $13,213 in 2021 and 2020, respectively		1,097,202	1,076,542
Investments in unconsolidated joint ventures		3,698,701	3,823,322
Deferred costs, net		170,252	177,168
Other assets		445,635	448,213
Total assets	[2]	12,044,045	11,707,567
Liabilities
Mortgages and other loans payable, net		1,848,701	1,979,972
Revolving credit facility, net		625,809	105,262
Unsecured term loans, net		1,495,620	1,495,275
Unsecured notes, net		1,248,622	1,248,219
Accrued interest payable		22,796	14,825
Other liabilities		267,908	302,798
Accounts payable and accrued expenses		120,015	151,309
Deferred revenue		119,215	118,572
Lease liability - financing leases		152,622	152,521
Lease liability - operating leases		455,385	339,458
Dividend and distributions payable		24,924	149,294
Security deposits		54,181	53,836
Liabilities related to assets held for sale		0	0
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities		100,000	100,000
Total liabilities	[2]	6,535,798	6,211,341
Commitments and contingencies
Limited partner interests in SLGOP (4,156 and 3,939 limited partner common units outstanding at March 31, 2021 and December 31, 2020, respectively)		374,124	358,262
Preferred units		198,503	202,169
Equity
Accumulated other comprehensive loss		(18,897)	(67,247)
SL Green stockholders equity:
Series I Preferred Units, $25.00 liquidation preference, 9,200 issued and outstanding at both March 31, 2021 and December 31, 2020		221,932	221,932
SL Green partners' capital (735 and 724 general partner common units and 68,619 and 67,784 limited partner common units outstanding at March 31, 2021 and December 31, 2020, respectively)		4,707,991	4,755,078
Total SLGOP partners' capital		4,911,026	4,909,763
Noncontrolling interests in other partnerships		24,594	26,032
Total capital		4,935,620	4,935,795
Total liabilities and equity/capital		12,044,045	11,707,567
Variable Interest Entity, Primary Beneficiary
Commercial real estate properties, at cost:
Land and land interests		179,600	41,200
Building and improvements		282,300	57,900
Building leasehold and improvements		2,000	2,000
Right of use asset - financing leases		53,200	37,800
Less: accumulated depreciation		(16,400)	(10,300)
Other assets		297,100	289,500
Liabilities
Mortgages and other loans payable, net		368,600	94,000
Accrued interest payable		900	700
Other liabilities		31,200	56,600
Lease liability - financing leases		$ 45,300	$ 29,900

[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: $179.6 million and $41.2 million of land, $282.3 million and $57.9 million of building and improvements, $2.0 million and $2.0 million of building and leasehold improvements, $53.2 million and $37.8 million of right of use assets, $16.4 million and $10.3 million of accumulated depreciation, $297.1 million and $289.5 million of other assets included in other line items, $368.6 million and $94.0 million of real estate debt, net, $0.9 million and $0.7 million of accrued interest payable, $45.3 million and $29.9 million of lease liabilities, and $31.2 million and $56.6 million of other liabilities included in other line items as of March 31, 2021 and December 31, 2020, 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, excluding the Operating Partnership: $179.6 million and $41.2 million of land, $282.3 million and $57.9 million of building and improvements, $2.0 million and $2.0 million of building and leasehold improvements, $53.2 million and $37.8 million of right of use assets, $16.4 million and $10.3 million of accumulated depreciation, $297.1 million and $289.5 million of other assets included in other line items, $368.6 million and $94.0 million of real estate debt, net, $0.9 million and $0.7 million of accrued interest payable, $45.3 million and $29.9 million of lease liabilities, and $31.2 million and $56.6 million of other liabilities included in other line items as of March 31, 2021 and December 31, 2020, respectively.

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt and preferred equity investments, discount and deferred origination fees	$ 9,817	$ 11,232
Allowance for loan and lease losses, real estate	$ 13,213	$ 13,213
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)	70,380,000	69,534,000
Common stock, shares outstanding (in shares)	70,380,000	69,534,000
Treasury stock, shares (in shares)	1,026,000	1,026,000
Land and land interests	$ 1,445,199	$ 1,315,832
Building and improvements	4,096,930	4,168,193
Building leasehold and improvements	1,730,418	1,448,134
Right of use asset - financing leases	55,711	55,711
Accumulated depreciation	2,004,945	1,956,077
Other assets	445,635	448,213
Mortgages and other loans payable, net	1,848,701	1,979,972
Accrued interest payable	22,796	14,825
Lease liability - financing leases	152,622	152,521
Other liabilities	$ 267,908	$ 302,798
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
SL Green Operating Partnership
Debt and preferred equity investments, discount and deferred origination fees	$ 9,817	$ 11,232
Allowance for loan and lease losses, real estate	$ 13,213	$ 13,213
Limited partner interests in Operating Partnership, limited partner common units outstanding (shares)	4,156,000	3,939,000
SL Green partner's capital, general partner common units outstanding (shares)	735,000	724,000
SL Green partners' capital, limited partner common units outstanding (shares)	68,619,000	67,784,000
Land and land interests	$ 1,445,199	$ 1,315,832
Building and improvements	4,096,930	4,168,193
Building leasehold and improvements	1,730,418	1,448,134
Right of use asset - financing leases	55,711	55,711
Accumulated depreciation	2,004,945	1,956,077
Other assets	445,635	448,213
Mortgages and other loans payable, net	1,848,701	1,979,972
Accrued interest payable	22,796	14,825
Lease liability - financing leases	152,622	152,521
Other liabilities	$ 267,908	$ 302,798
SL Green Operating Partnership | Series I Preferred Stock
Preferred units, liquidation preference (in dollars per share)	$ 25.00	$ 25.00
Preferred units, shares issued (in shares)	9,200,000	9,200,000
Preferred units, shares outstanding (in shares)	9,200,000	9,200,000
Variable Interest Entity, Primary Beneficiary
Land and land interests	$ 179,600	$ 41,200
Building and improvements	282,300	57,900
Building leasehold and improvements	2,000	2,000
Right of use asset - financing leases	53,200	37,800
Accumulated depreciation	16,400	10,300
Other assets	297,100	289,500
Mortgages and other loans payable, net	368,600	94,000
Accrued interest payable	900	700
Lease liability - financing leases	45,300	29,900
Other liabilities	$ 31,200	$ 56,600

XML

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues
Rental revenue, net	$ 188,089	$ 222,631
Investment income	19,273	38,533
Other income	18,740	53,139
Total revenues	226,102	314,303
Expenses
Operating expenses, including related party expenses of $2,225 in 2021 and $3,749 in 2020	42,284	53,866
Real estate taxes	45,411	46,622
Operating lease rent	6,739	7,367
Interest expense, net of interest income	23,388	37,494
Amortization of deferred financing costs	3,774	2,500
Depreciation and amortization	62,996	68,279
Loan loss and other investment reserves, net of recoveries	0	11,248
Transaction related costs	22	65
Marketing, general and administrative	22,885	19,570
Total expenses	207,499	247,011
Equity in net loss from unconsolidated joint ventures	(2,864)	(12,814)
Equity in net loss on sale of interest in unconsolidated joint venture/real estate	(12,629)	0
Purchase price and other fair value adjustments	2,664	0
(Loss) gain on sale of real estate, net	(1,388)	72,636
Depreciable real estate reserves and impairment	(8,241)	0
Net (loss) income	(3,855)	127,114
Net loss (income) attributable to noncontrolling interests:
Noncontrolling interests in the Operating Partnership	476	(6,202)
Noncontrolling interests in other partnerships	1,499	293
Preferred units distributions	(1,846)	(2,666)
Net income (loss) attributable to SL Green/SLGOP	(3,726)	118,539
Perpetual preferred stock dividends	(3,738)	(3,738)
Net income attributable to SL Green common stockholders	$ (7,464)	$ 114,801
Basic earnings per share (usd per share)	$ (0.11)	$ 1.51
Diluted earnings per share (usd per share)	$ (0.11)	$ 1.51
Basic weighted average common shares outstanding (in shares)	69,010	75,656
Diluted weighted average common shares and common share equivalents outstanding (in shares)	74,070	80,352
SL Green Operating Partnership
Revenues
Rental revenue, net	$ 188,089	$ 222,631
Investment income	19,273	38,533
Other income	18,740	53,139
Total revenues	226,102	314,303
Expenses
Operating expenses, including related party expenses of $2,225 in 2021 and $3,749 in 2020	42,284	53,866
Real estate taxes	45,411	46,622
Operating lease rent	6,739	7,367
Interest expense, net of interest income	23,388	37,494
Amortization of deferred financing costs	3,774	2,500
Depreciation and amortization	62,996	68,279
Loan loss and other investment reserves, net of recoveries	0	11,248
Transaction related costs	22	65
Marketing, general and administrative	22,885	19,570
Total expenses	207,499	247,011
Equity in net loss from unconsolidated joint ventures	(2,864)	(12,814)
Equity in net loss on sale of interest in unconsolidated joint venture/real estate	(12,629)	0
Purchase price and other fair value adjustments	2,664	0
(Loss) gain on sale of real estate, net	(1,388)	72,636
Depreciable real estate reserves and impairment	(8,241)	0
Net (loss) income	(3,855)	127,114
Net loss (income) attributable to noncontrolling interests:
Noncontrolling interests in other partnerships	1,499	293
Preferred units distributions	(1,846)	(2,666)
Net income (loss) attributable to SL Green/SLGOP	(4,202)	124,741
Perpetual preferred unit distributions	(3,738)	(3,738)
Net (loss) income attributable to SLGOP common unitholders	$ (7,940)	$ 121,003
Basic earnings per unit (usd per share)	$ (0.11)	$ 1.51
Diluted earnings per unit (usd per share)	$ (0.11)	$ 1.51
Basic weighted average common units outstanding (in shares)	73,158	79,876
Diluted weighted average common units and common unit equivalents outstanding (in shares)	74,070	80,352

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Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating expenses, paid to related parties	$ 2,225	$ 3,749
SL Green Operating Partnership
Operating expenses, paid to related parties	$ 2,225	$ 3,749

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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net (loss) income	$ (3,855)	$ 127,114
Other comprehensive income (loss):
Increase (decrease) in unrealized value of derivative instruments, including SL Green's share of joint venture derivative instruments	51,263	(50,735)
Decrease in unrealized value of marketable securities	(258)	(4,534)
Other comprehensive income (loss)	51,005	(55,269)
Comprehensive income	47,150	71,845
Net loss (income) attributable to noncontrolling interests and preferred units distributions	129	(8,575)
Net loss attributable to noncontrolling interests	1,499	293
Other comprehensive (income) loss attributable to noncontrolling interests	(2,655)	2,886
Comprehensive income attributable to SL Green/SLGOP	44,624	66,156
SL Green Operating Partnership
Net (loss) income	(3,855)	127,114
Other comprehensive income (loss):
Increase (decrease) in unrealized value of derivative instruments, including SL Green's share of joint venture derivative instruments	51,263	(50,735)
Decrease in unrealized value of marketable securities	(258)	(4,534)
Other comprehensive income (loss)	51,005	(55,269)
Comprehensive income	47,150	71,845
Net loss attributable to noncontrolling interests	1,499	293
Other comprehensive (income) loss attributable to noncontrolling interests	(2,655)	2,886
Comprehensive income attributable to SL Green/SLGOP	$ 45,994	$ 75,024

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Consolidated Statement of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In-Capital	Treasury Stock	Accumulated Other Comprehensive Loss	Retained Earnings	Noncontrolling Interests	Series I Preferred Stock Preferred Stock	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjustment Retained Earnings	Cumulative Effect, Period of Adoption, Adjusted Balance	Cumulative Effect, Period of Adoption, Adjusted Balance Common Stock	Cumulative Effect, Period of Adoption, Adjusted Balance Additional Paid-In-Capital	Cumulative Effect, Period of Adoption, Adjusted Balance Treasury Stock	Cumulative Effect, Period of Adoption, Adjusted Balance Accumulated Other Comprehensive Loss	Cumulative Effect, Period of Adoption, Adjusted Balance Retained Earnings	Cumulative Effect, Period of Adoption, Adjusted Balance Noncontrolling Interests	Cumulative Effect, Period of Adoption, Adjusted Balance Series I Preferred Stock Preferred Stock
Beginning Balance at Dec. 31, 2019	$ 5,517,198	$ 803	$ 4,286,395	$ (124,049)	$ (28,485)	$ 1,084,719	$ 75,883	$ 221,932	$ (39,184)	$ (39,184)	$ 5,478,014	$ 803	$ 4,286,395	$ (124,049)	$ (28,485)	$ 1,045,535	$ 75,883	$ 221,932
Beginning Balance (in shares) at Dec. 31, 2019		76,956										76,956
Increase (Decrease) in Stockholders' Equity
Accounting Standards Update	us-gaap:AccountingStandardsUpdate201613Member
Net loss	$ 118,246					118,539	(293)
Acquisition of subsidiary interest from noncontrolling interest	(1,536)		(3,123)				1,587
Other comprehensive income	(52,383)				(52,383)
Preferred dividends	(3,738)					(3,738)
DRSPP proceeds (in shares)		2
DRSPP proceeds	166		166
Conversion of units of the Operating Partnership to common stock (in shares)		1
Conversion of units in the Operating Partnership for common stock	84		84
Reallocation of noncontrolling interest in the Operating Partnership	38,529					38,529
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)		(32)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	5,502	$ (1)	5,503
Repurchases of common stock (in shares)		(2,562)
Repurchases of common stock	(219,576)	$ (26)	(142,719)			(76,831)
Contributions to consolidated joint venture interests	3,814						3,814
Cash distributions to noncontrolling interests	(492)						(492)
Cash distributions declared (per common share, none of which represented a return of capital for federal income tax purposes)	(22,665)					(22,665)
Ending Balance at Mar. 31, 2020	5,343,965	$ 776	4,146,306	(124,049)	(80,868)	1,099,369	80,499	221,932
Ending Balance (in shares) at Mar. 31, 2020		74,365
Beginning Balance at Dec. 31, 2019	5,517,198	$ 803	4,286,395	(124,049)	(28,485)	1,084,719	75,883	221,932	$ (39,184)	$ (39,184)	$ 5,478,014	$ 803	$ 4,286,395	$ (124,049)	$ (28,485)	$ 1,045,535	$ 75,883	$ 221,932
Beginning Balance (in shares) at Dec. 31, 2019		76,956										76,956
Ending Balance at Dec. 31, 2020	4,935,795	$ 716	3,862,949	(124,049)	(67,247)	1,015,462	26,032	221,932
Ending Balance (in shares) at Dec. 31, 2020		68,508
Increase (Decrease) in Stockholders' Equity
Net loss	(5,225)					(3,726)	(1,499)
Other comprehensive income	48,350				48,350
Preferred dividends	(3,738)					(3,738)
DRSPP proceeds (in shares)		5
DRSPP proceeds	351		351
Reallocation of noncontrolling interest in the Operating Partnership	(26,609)					(26,609)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)		113
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	6,728	$ 2	6,726
Repurchases of common stock (in shares)		(1,306)
Repurchases of common stock	(80,310)	$ (13)	(80,297)			0
Contributions to consolidated joint venture interests	171						171
Cash distributions to noncontrolling interests	(110)						(110)
Issuance of special dividend paid primarily in stock (in shares)		2,034
Issuance of special dividend paid primarily in stock	123,529		123,529
Cash distributions declared (per common share, none of which represented a return of capital for federal income tax purposes)	(63,312)					(63,312)
Ending Balance at Mar. 31, 2021	$ 4,935,620	$ 705	$ 3,913,258	$ (124,049)	$ (18,897)	$ 918,077	$ 24,594	$ 221,932
Ending Balance (in shares) at Mar. 31, 2021		69,354

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Consolidated Statement of Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Cash distribution declared, per common share (in dollars per share)	$ 0.910	$ 0.304

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Consolidated Statements of Capital - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Increase (Decrease) in Partner's Capital
Accounting Standards Update		us-gaap:AccountingStandardsUpdate201613Member		us-gaap:AccountingStandardsUpdate201613Member
Acquisition of subsidiary interest from noncontrolling interest		$ (1,536)
DRSPP proceeds	$ 351	166
Conversion of common units		84
Reallocation of noncontrolling interests in the operating partnership	(26,609)	38,529
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	6,728	5,502
Repurchases of common stock	(80,310)	(219,576)
Contribution to consolidated joint venture interests	171	3,814
Cash distributions to noncontrolling interests	$ (110)	$ (492)
Cash distribution declared, per common share (in dollars per share)	$ 0.910	$ 0.304
Common Stock
Increase (Decrease) in Partner's Capital
DRSPP proceeds (in shares)	5	2
Conversion of common units
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)	113	(32)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	$ 2	$ (1)
Repurchases of common stock (in shares)	(1,306)	(2,562)
Repurchases of common stock	$ (13)	$ (26)
Noncontrolling Interests
Increase (Decrease) in Partner's Capital
Acquisition of subsidiary interest from noncontrolling interest		1,587
Contribution to consolidated joint venture interests	171	3,814
Cash distributions to noncontrolling interests	(110)	(492)
SL Green Operating Partnership
Increase (Decrease) in Partner's Capital
Beginning Balance	4,935,795	5,517,198	$ 5,517,198
Net loss	(5,225)	118,246
Acquisition of subsidiary interest from noncontrolling interest		(1,536)
Other comprehensive income	48,350	(52,383)
Preferred distributions	(3,738)	(3,738)
DRSPP proceeds	351	166
Conversion of common units		84
Reallocation of noncontrolling interests in the operating partnership	(26,609)	38,529
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	6,728	5,502
Repurchases of common stock	(80,310)	(219,576)
Contribution to consolidated joint venture interests	171	3,814
Cash distributions to noncontrolling interests	(110)	$ (492)
Issuance of special distribution paid primarily in units	$ 123,529
Cash distribution declared, per common share (in dollars per share)	$ 0.910	$ 0.304
Cash distributions declared (per common unit, none of which represented a return of capital for federal income tax purposes)	$ (63,312)	$ (22,665)
Ending Balance	4,935,620	5,343,965	4,935,795	$ 5,517,198
SL Green Operating Partnership | Common Stock | Partners' Interest
Increase (Decrease) in Partner's Capital
Beginning Balance	$ 4,755,078	$ 5,247,868	$ 5,247,868
Beginning Balance (units)	68,508	76,956	76,956
Net loss	$ (3,726)	$ 118,539
Acquisition of subsidiary interest from noncontrolling interest		(3,123)
Preferred distributions	$ (3,738)	$ (3,738)
DRSPP proceeds (in shares)	5	2
DRSPP proceeds	$ 351	$ 166
Conversion of common units (in shares)		1
Conversion of common units		$ 84
Reallocation of noncontrolling interests in the operating partnership	$ (26,609)	$ 38,529
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)	113	(32)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	$ 6,728	$ 5,502
Repurchases of common stock (in shares)	(1,306)	(2,562)
Repurchases of common stock	$ (80,310)	$ (219,576)
Issuance of special distribution paid primarily in units	$ 123,529
Issuance of special distribution paid primarily in units (in units)	2,034
Cash distributions declared (per common unit, none of which represented a return of capital for federal income tax purposes)	$ (63,312)	(22,665)
Ending Balance	$ 4,707,991	$ 5,122,402	$ 4,755,078	$ 5,247,868
Ending Balance (units)	69,354	74,365	68,508	76,956
SL Green Operating Partnership | Accumulated Other Comprehensive Loss
Increase (Decrease) in Partner's Capital
Beginning Balance	$ (67,247)	$ (28,485)	$ (28,485)
Other comprehensive income	48,350	(52,383)
Ending Balance	(18,897)	(80,868)	(67,247)	$ (28,485)
SL Green Operating Partnership | Noncontrolling Interests
Increase (Decrease) in Partner's Capital
Beginning Balance	26,032	75,883	75,883
Net loss	(1,499)	(293)
Acquisition of subsidiary interest from noncontrolling interest		1,587
Contribution to consolidated joint venture interests	171	3,814
Cash distributions to noncontrolling interests	(110)	(492)
Ending Balance	24,594	80,499	26,032	75,883
Series I Preferred Stock | SL Green Operating Partnership | Preferred Units
Increase (Decrease) in Partner's Capital
Beginning Balance	221,932	221,932	221,932
Ending Balance	$ 221,932	221,932	221,932	221,932
Cumulative Effect, Period of Adoption, Adjustment | SL Green Operating Partnership
Increase (Decrease) in Partner's Capital
Beginning Balance		(39,184)	(39,184)
Ending Balance				(39,184)
Cumulative Effect, Period of Adoption, Adjustment | SL Green Operating Partnership | Common Stock | Partners' Interest
Increase (Decrease) in Partner's Capital
Beginning Balance		(39,184)	(39,184)
Ending Balance				(39,184)
Cumulative Effect, Period of Adoption, Adjusted Balance | SL Green Operating Partnership
Increase (Decrease) in Partner's Capital
Beginning Balance		5,478,014	5,478,014
Ending Balance				5,478,014
Cumulative Effect, Period of Adoption, Adjusted Balance | SL Green Operating Partnership | Common Stock | Partners' Interest
Increase (Decrease) in Partner's Capital
Beginning Balance		$ 5,208,684	$ 5,208,684
Beginning Balance (units)		76,956	76,956
Ending Balance				$ 5,208,684
Ending Balance (units)				76,956
Cumulative Effect, Period of Adoption, Adjusted Balance | SL Green Operating Partnership | Accumulated Other Comprehensive Loss
Increase (Decrease) in Partner's Capital
Beginning Balance		$ (28,485)	$ (28,485)
Ending Balance				$ (28,485)
Cumulative Effect, Period of Adoption, Adjusted Balance | SL Green Operating Partnership | Noncontrolling Interests
Increase (Decrease) in Partner's Capital
Beginning Balance		75,883	75,883
Ending Balance				75,883
Cumulative Effect, Period of Adoption, Adjusted Balance | Series I Preferred Stock | SL Green Operating Partnership | Preferred Units
Increase (Decrease) in Partner's Capital
Beginning Balance		$ 221,932	$ 221,932
Ending Balance				$ 221,932

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Consolidated Statements of Capital (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash distribution declared, per common share (in dollars per share)	$ 0.910	$ 0.304
SL Green Operating Partnership
Cash distribution declared, per common share (in dollars per share)	$ 0.910	$ 0.304

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Activities
Net (loss) income	$ (3,855)	$ 127,114
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	66,770	70,779
Equity in net loss from unconsolidated joint ventures	2,864	12,814
Distributions of cumulative earnings from unconsolidated joint ventures	69	108
Equity in net loss on sale of interest in unconsolidated joint venture interest/real estate	12,629	0
Purchase price and other fair value adjustments	(2,664)	0
Depreciable real estate reserves and impairment	8,241	0
Loss (gain) on sale of real estate, net	1,388	(72,636)
Loan loss reserves and other investment reserves, net of recoveries	0	11,248
Deferred rents receivable	(2,685)	3,717
Non-cash lease expense	3,375	3,390
Other non-cash adjustments	15,564	1,110
Changes in operating assets and liabilities:
Tenant and other receivables	(4,138)	(44,960)
Related party receivables	(683)	(4,711)
Deferred lease costs	(240)	(8,603)
Other assets	(24,354)	(48,130)
Accounts payable, accrued expenses, other liabilities and security deposits	(38,640)	(13,877)
Deferred revenue	4,121	7,622
Lease liability - operating leases	(19,160)	(2,959)
Net cash provided by operating activities	18,602	42,026
Investing Activities
Acquisitions of real estate property	0	(86,846)
Additions to land, buildings and improvements	(49,328)	(101,726)
Investments in unconsolidated joint ventures	(21,027)	(8,906)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	19,692	53,516
Net proceeds from disposition of real estate/joint venture interest	62,800	91,156
Cash assumed from consolidation of real estate investment	9,475	0
Proceeds from sale or redemption of marketable securities	4,528	0
Other investments	(54)	(4,786)
Origination of debt and preferred equity investments	(5,905)	(223,374)
Repayments or redemption of debt and preferred equity investments	0	151,548
Net cash provided by (used in) investing activities	20,181	(129,418)
Financing Activities
Proceeds from mortgages and other loans payable	10,391	101,103
Repayments of mortgages and other loans payable	(362,542)	(102,777)
Proceeds from revolving credit facility and unsecured notes	530,000	1,125,000
Repayments of revolving credit facility and unsecured notes	(10,000)	(315,000)
Proceeds from stock options exercised and DRSPP issuance	351	166
Repurchase of common stock	(84,089)	(219,576)
Redemption of preferred stock	(3,631)	(19,392)
Redemption of OP units	(13,261)	(18,066)
Distributions to noncontrolling interests in other partnerships	(110)	(492)
Contributions from noncontrolling interests in other partnerships	171	3,814
Acquisition of subsidiary interest from noncontrolling interest	0	(1,536)
Distributions to noncontrolling interests in the Operating Partnership	(4,148)	(1,284)
Dividends paid on common and preferred stock	(69,772)	(79,662)
Tax withholdings related to restricted share awards	(2,788)	(4,752)
Deferred loan costs	(288)	(562)
Principal payments of on financing lease liabilities	(255)	0
Net cash (used in) provided by financing activities	(9,971)	466,984
Net increase in cash, cash equivalents, and restricted cash	28,812	379,592
Cash, cash equivalents, and restricted cash at beginning of year	372,795	241,430
Cash, cash equivalents, and restricted cash at end of period	401,607	621,022
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Conversion of units in the Operating Partnership	0	84
Issuance of special dividend paid primarily in stock	123,529	0
Tenant improvements and capital expenditures payable	15,214	602
Fair value adjustment to noncontrolling interest in the Operating Partnership	26,609	0
Consolidation of real estate investment	119,444	0
Reversal of assets held for sale	0	391,664
Extinguishment of debt in connection with property dispositions	53,548	0
Seller financed purchases	0	100,000
Debt and preferred equity investments	10,000	4,638
Removal of fully depreciated commercial real estate properties	1,120	512
Share repurchase payable	3,779	0
Recognition of right of use assets and related lease liabilities	119,711	102,782
Total cash, cash equivalents, and restricted cash	401,607	621,022
SL Green Operating Partnership
Operating Activities
Net (loss) income	(3,855)	127,114
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	66,770	70,779
Equity in net loss from unconsolidated joint ventures	2,864	12,814
Distributions of cumulative earnings from unconsolidated joint ventures	69	108
Equity in net loss on sale of interest in unconsolidated joint venture interest/real estate	12,629	0
Purchase price and other fair value adjustments	(2,664)	0
Depreciable real estate reserves and impairment	8,241	0
Loss (gain) on sale of real estate, net	1,388	(72,636)
Loan loss reserves and other investment reserves, net of recoveries	0	11,248
Deferred rents receivable	(2,685)	3,717
Non-cash lease expense	3,375	3,390
Other non-cash adjustments	15,564	1,110
Changes in operating assets and liabilities:
Tenant and other receivables	(4,138)	(44,960)
Related party receivables	(683)	(4,711)
Deferred lease costs	(240)	(8,603)
Other assets	(24,354)	(48,130)
Accounts payable, accrued expenses, other liabilities and security deposits	(38,640)	(13,877)
Deferred revenue	4,121	7,622
Lease liability - operating leases	(19,160)	(2,959)
Net cash provided by operating activities	18,602	42,026
Investing Activities
Acquisitions of real estate property	0	(86,846)
Additions to land, buildings and improvements	(49,328)	(101,726)
Investments in unconsolidated joint ventures	(21,027)	(8,906)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	19,692	53,516
Net proceeds from disposition of real estate/joint venture interest	62,800	91,156
Cash assumed from consolidation of real estate investment	9,475	0
Proceeds from sale or redemption of marketable securities	4,528	0
Other investments	(54)	(4,786)
Origination of debt and preferred equity investments	(5,905)	(223,374)
Repayments or redemption of debt and preferred equity investments	0	151,548
Net cash provided by (used in) investing activities	20,181	(129,418)
Financing Activities
Proceeds from mortgages and other loans payable	10,391	101,103
Repayments of mortgages and other loans payable	(362,542)	(102,777)
Proceeds from revolving credit facility and unsecured notes	530,000	1,125,000
Repayments of revolving credit facility and unsecured notes	(10,000)	(315,000)
Proceeds from stock options exercised and DRSPP issuance	351	166
Repurchase of common stock	(84,089)	(219,576)
Redemption of preferred stock	(3,631)	(19,392)
Redemption of OP units	(13,261)	(18,066)
Distributions to noncontrolling interests in other partnerships	(110)	(492)
Contributions from noncontrolling interests in other partnerships	171	3,814
Acquisition of subsidiary interest from noncontrolling interest	0	(1,536)
Dividends paid on common and preferred stock	(73,920)	(80,946)
Tax withholdings related to restricted share awards	(2,788)	(4,752)
Deferred loan costs	(288)	(562)
Principal payments of on financing lease liabilities	(255)	0
Net cash (used in) provided by financing activities	(9,971)	466,984
Net increase in cash, cash equivalents, and restricted cash	28,812	379,592
Cash, cash equivalents, and restricted cash at beginning of year	372,795	241,430
Cash, cash equivalents, and restricted cash at end of period	401,607	621,022
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Conversion of units in the Operating Partnership	0	84
Issuance of special dividend paid primarily in stock	123,529	0
Tenant improvements and capital expenditures payable	15,214	602
Fair value adjustment to noncontrolling interest in the Operating Partnership	26,609	0
Consolidation of real estate investment	119,444	0
Reversal of assets held for sale	0	391,664
Extinguishment of debt in connection with property dispositions	53,548	0
Seller financed purchases	0	100,000
Debt and preferred equity investments	10,000	4,638
Removal of fully depreciated commercial real estate properties	1,120	512
Share repurchase payable	3,779	0
Recognition of right of use assets and related lease liabilities	119,711	102,782
Total cash, cash equivalents, and restricted cash	$ 401,607	$ 621,022

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Organization and Basis of Presentation

3 Months Ended

Mar. 31, 2021

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 March 31, 2021, noncontrolling investors held, in the aggregate, a 5.65% 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."

On December 4, 2020 our Board of Directors declared an ordinary dividend and a special dividend (together, "the Total Dividend"). The Total Dividend was paid on January 15, 2021 to shareholders of record at the close of business on December 15, 2020 ("the Record Date"). Shareholders had the opportunity to elect to receive the Total Dividend in the form of all cash or all stock, subject to proration if either option was oversubscribed. As a result of the elections made, the cash option was oversubscribed and was prorated. Shareholders who elected to receive cash received, for each share of common stock they owned as of the Record Date, approximately $0.3735 in cash and 0.0279 shares of common stock. Shareholders who elected to receive shares received, for each share of common stock they owned as of the Record Date, approximately 0.0343 shares of common stock. The number of shares issued was calculated based on the volume weighted average trading price of SLG's common stock between January 5-7, 2021, of $58.15 per share.

To mitigate the dilutive impact of the common stock issued in the special dividend, the board of directors also authorized a reverse stock split, which was effective after markets closed on January 20, 2021. On January 8, 2021, a committee of the Board of Directors calculated the ratio for the reverse stock split of our issued and outstanding shares of common stock as 1.02918-for-1. After the issuance of the dividend and the completion of the reverse stock split, the number of shares of our common stock outstanding was equivalent to the number of total shares outstanding on the Record Date (not including any issuances or repurchases that occurred following the Record Date, as well as any fractional shares that would have been issued but for which cash-in-lieu was paid). However, on a relative basis, some individual shareholders may have more shares of SLG’s common stock, and some individual shareholders may have fewer shares of our common stock, depending on their individual elections to receive cash or stock and as a result of the cash option being oversubscribed.

All share-related references and measurements including the number of shares outstanding, share prices, number of shares repurchased, earnings per share, dividends per share, and share-based compensation awards, have been retroactively adjusted to reflect the reverse stock split for all periods presented in this Quarterly Report on Form 10-Q.

As of March 31, 2021, we owned the following interests in properties in the New York metropolitan area, primarily in midtown Manhattan. Our investments located outside of Manhattan are referred to as the Suburban properties:

		Consolidated		Unconsolidated		Total
Location	Property Type	Number of Buildings	Approximate Square Feet (unaudited)	Number of Buildings	Approximate Square Feet (unaudited)	Number of Buildings	Approximate Square Feet (unaudited)	Weighted Average Occupancy(1) (unaudited)
Commercial:
Manhattan	Office	18	10,526,345	9	10,869,183	27	21,395,528	93.4	%
	Retail	1	10,040	9	301,996	10	312,036	94.6	%
	Development/Redevelopment	9	1,890,614	3	2,927,782	12	4,818,396	N/A
		28	12,426,999	21	14,098,961	49	26,525,960	93.5	%
Suburban	Office	7	862,800	—	—	7	862,800	81.6	%
Total commercial properties		35	13,289,799	21	14,098,961	56	27,388,760	93.0	%
Residential:
Manhattan	Residential	1	82,250	8	1,663,774	9	1,746,024	79.1	%
Total portfolio		36	13,372,049	29	15,762,735	65	29,134,784	92.2	%

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

As of March 31, 2021, we also managed two office buildings owned by third parties encompassing approximately 2.1 million square feet (unaudited), and held debt and preferred equity investments with a book value of $1.1 billion, excluding $0.1 billion of debt and preferred equity investments and other financing receivables that are included in 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, subject to the priority distributions with respect to preferred units and special provisions that apply to LTIP Units. 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 March 31, 2021 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, 2021. 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, 2020 of the Company and the Operating Partnership.

The consolidated balance sheet at December 31, 2020 has been derived from the audited financial statements as of that date but does not include all the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

Subsequent Events

In April 2021, the Company exercised its option to acquire the fee interest in 461 Fifth Avenue from the ground lessor of the property for a purchase price of $28.0 million. At March 31, 2021, the Company held the leasehold interest in the property. The transaction is expected to close in the second quarter of 2021.

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Significant Accounting Policies

3 Months Ended

Mar. 31, 2021

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 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

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 3 years 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 1 year to 15 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 1 year to 15 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 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.

The Company classifies those leases under which the Company is the lessee at lease commencement as finance or operating leases. Leases qualify as finance leases if the lease transfers ownership of the asset at the end of the lease term, the lease grants an option to purchase the asset that we are reasonably certain to exercise, the lease term is for a major part of the remaining economic life of the asset, or the present value of the lease payments exceeds substantially all of the fair value of the asset. Leases that do not qualify as finance leases are deemed to be operating leases. At lease commencement the Company records a lease liability which is measured as the present value of the lease payments and a right of use asset which is measured as the amount of the lease liability and any initial direct costs incurred. The Company applies a discount rate to determine the present value of the lease payments. If the rate implicit in the lease is known, the Company uses that rate. If the rate implicit in the lease is not known, the Company uses a discount rate reflective of the Company’s collateralized borrowing rate given the term of the lease. To determine the discount rate, the Company employs a third party specialist to develop an analysis based primarily on the observable borrowing rates of the Company, other REITs, and other corporate borrowers with long-term borrowings. On the consolidated statements of operations, operating leases are expensed through operating lease rent while financing leases are expensed through amortization and interest expense. On the consolidated balance sheets, financing leases include the amounts previously captioned "Properties under capital lease." When applicable, the Company combines the consideration for lease and non-lease components in the calculation of the value of the lease obligation and right-of-use asset.

On a periodic basis, we assess whether there are any indications that the value of our real estate properties may be 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 fair value of the property as calculated in accordance with Accounting Standards Codification, or ASC 820. We also

evaluate our real estate properties for impairment when a property has been classified as held for sale. Real estate assets held for sale are valued at the lower of their carrying value or fair value less costs to sell and depreciation expense is no longer recorded.

For the three months ended March 31, 2021, we recognized ($1.9 million) of rental revenue for the amortization of aggregate above-market leases in excess of below-market leases resulting from the allocation of the purchase price of the applicable properties. For the three months ended March 31, 2020 , we recognized $1.2 million of rental revenue for the amortization of aggregate below-market leases in excess of above-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 March 31, 2021 and December 31, 2020 (in thousands):

	March 31, 2021		December 31, 2020
Identified intangible assets (included in other assets):
Gross amount	$	239,562	$	215,673
Accumulated amortization	(204,386)		(190,523)
Net(1)	$	35,176	$	25,150
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	242,334	$	241,409
Accumulated amortization	(233,766)		(230,479)
Net(1)	$	8,568	$	10,930

(1) As of March 31, 2021 and December 31, 2020, no net intangible assets and no net intangible liabilities were reclassified to assets held for sale or liabilities related to assets held for sale.

Cash and Cash Equivalents

We consider all highly liquid investments with maturity of three months or less when purchased to be cash equivalents.

Restricted Cash

Restricted cash primarily consists of security deposits held on behalf of our tenants, interest reserves, as well as capital improvement and real estate tax escrows required under certain loan agreements.

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 March 31, 2021, 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 ASC 820-10, with the net unrealized gains or losses reported as a component of accumulated other comprehensive income or loss. The cost of marketable securities sold and the amount reclassified out of accumulated other comprehensive income into earnings is determined using the specific identification method. Credit losses are recognized in accordance with ASC 326.

At March 31, 2021 and December 31, 2020, we held the following marketable securities (in thousands):

	March 31, 2021		December 31, 2020
Commercial mortgage-backed securities	$	23,784	$	28,570
Total marketable securities available-for-sale	$	23,784	$	28,570

The cost basis of the commercial mortgage-backed securities was $23.0 million and $27.5 million at March 31, 2021 and December 31, 2020, respectively. These securities mature at various times through 2035. All securities were in an unrealized gain position at March 31, 2021 and December 31, 2020 except for one security, which had an unrealized loss of $0.7 million and a fair market value of $7.1 million at March 31, 2021, and an unrealized loss of $0.7 million and a fair value of $7.0 million at December 31, 2020. This marketable security had been in a continuous unrealized loss position for more than 12 months at March 31, 2021 and less than 12 months at December 31, 2020. 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.

We held no equity marketable securities as of March 31, 2021 and December 31, 2020.

During the three months ended March 31, 2021, we received aggregate net proceeds of $5.0 million from the repayment of one marketable security. We did not dispose of further marketable securities during three months ended March 31, 2021. During the three months ended March 31, 2020, we did not dispose of or receive repayment of any further marketable securities.

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 each joint ventures' actual and projected cash flows. We do not believe that the values of any of our equity investments were impaired at March 31, 2021.

Deferred Lease Costs

Deferred lease costs consist of incremental fees and direct costs that would not have been incurred if the lease had not been obtained and are amortized on a straight-line basis over the related lease term.

Lease Classification

Lease classification for leases under which the Company is the lessor is evaluated at lease commencement and leases not classified as sales-type leases or direct financing leases are classified as operating leases. Leases qualify as sales-type leases if the contract includes either transfer of ownership clauses, certain purchase options, a lease term representing a major part of the economic life of the asset, or the present value of the lease payments and residual guarantees provided by the lessee exceeds substantially all of the fair value of the asset. Additionally, leasing an asset so specialized that it is not deemed to have any value to the Company at the end of the lease term may also result in classification as a sales-type lease. Leases qualify as direct financing leases when the present value of the lease payments and residual value guarantees provided by the lessee and unrelated third parties exceeds substantially all of the fair value of the asset and collection of the payments is probable.

Revenue Recognition

Rental revenue for operating leases is recognized on a straight-line basis over the term of the lease. Rental revenue recognition commences when the leased space is available for its intended use by the lessee.

To determine whether the leased space is available for its intended use by the lessee, management evaluates whether we are the owner of tenant improvements for accounting purposes or if the tenant is. When management concludes that we are the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of the finished space, which is when such tenant improvements are substantially complete. In certain instances, when management concludes that we are not the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of or controls the space.

When management concludes that we are the owner of tenant improvements for accounting purposes, we record amounts funded to construct the tenant improvements as a capital asset. For these tenant improvements, we record amounts reimbursed by tenants as a reduction of the capital asset. When management concludes that the tenant is the owner of tenant improvements for accounting purposes, we record our contribution towards those improvements as a lease incentive, which is included in deferred costs, net on our consolidated balance sheets and amortized as a reduction to rental revenue on a straight-line basis over the term of the lease.

The excess of rents recognized over amounts contractually due pursuant to the underlying leases are included in deferred rents receivable on the consolidated balance sheets.

In addition to base rent, our tenants also generally will pay variable rent which represents their pro rata share of increases in real estate taxes and certain operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in certain building operating expenses, the tenant will pay additional rent based upon increases in the

wage rate paid to porters over the porters' wage rate in effect during a base year or increases in the consumer price index over the index value in effect during a base year. In addition, many of our leases contain fixed percentage increases over the base rent to cover escalations. Electricity is most often supplied by the landlord either on a sub-metered basis, or rent inclusion basis (i.e., a fixed fee is included in the rent for electricity, which amount may increase based upon increases in electricity rates or increases in electrical usage by the tenant). Base building services other than electricity (such as heat, air conditioning and freight elevator service during business hours, and base building cleaning) are typically provided at no additional cost, with the tenant paying additional rent only for services which exceed base building services or for services which are provided outside normal business hours. These escalations are based on actual expenses incurred in the prior calendar year. If the expenses in the current year are different from those in the prior year, then during the current year, the escalations will be adjusted to reflect the actual expenses for the current year.

Rental revenue is recognized if collectability is probable. If collectability of substantially all of the lease payments is assessed as not probable, any difference between the rental revenue recognized to date and the lease payments that have been collected is recognized as a current-period adjustment to rental revenue. A subsequent change in the assessment of collectability to probable may result in a current-period adjustment to rental revenue for any difference between the rental revenue that would have been recognized if collectability had always been assessed as probable and the rental revenue recognized to date.

We recognize lease concessions related to COVID-19, such as rent deferrals and abatements, in accordance with the Lease Modification Q&A issued by the FASB in April 2020, which provides entities with the option to elect to account for lease concessions as though the enforceable rights and obligations existed in the original lease. This election is only available when total cash flows resulting from the modified lease are substantially similar to the cash flows in the original lease. When total cash flows resulting from the modified lease are not substantially similar to the cash flows in the original lease, we account for the concession agreement as a new lease.

The Company provides its tenants with certain customary services for lease contracts such as common area maintenance and general security. We have elected to combine the non-lease components with the lease components of our operating lease agreements and account for them as a single lease component in accordance with ASC 842.

We record a gain or loss on sale of real estate assets when we no longer have a controlling financial interest in the entity owning the real estate, a contract exists with a third party and that third party has control of the assets acquired.

Investment income on debt and preferred equity investments is accrued based on the contractual terms of the instruments and when it is deemed collectible. Some debt and preferred equity investments provide for accrual of interest at specified rates, which differ from current payment terms. Interest is recognized on such loans at the accrual rate subject to management's determination that accrued interest is collectible. If management cannot make this determination, interest income above the current pay rate is recognized only upon actual receipt.

Deferred origination fees, original issue discounts and loan origination costs, if any, are recognized as an adjustment to interest income over the terms of the related investments using the effective interest method. Fees received in connection with loan commitments are also deferred until the loan is funded and are then recognized over the term of the loan as an adjustment to yield. Discounts or premiums associated with the purchase of loans are amortized or accreted into interest income as a yield adjustment on the effective interest method based on expected cash flows through the expected maturity date of the related investment. If we purchase a debt or preferred equity investment at a discount, intend to hold it until maturity and expect to recover the full value of the investment, we accrete the discount into income as an adjustment to yield over the term of the investment. If we purchase a debt or preferred equity investment at a discount with the intention of foreclosing on the collateral, we do not accrete the discount. For debt investments acquired at a discount for credit quality, the difference between contractual cash flows and expected cash flows at acquisition is not accreted. Anticipated exit fees, the collection of which is expected, are also recognized over the term of the loan as an adjustment to yield.

We consider a debt and preferred equity investment to be past due when amounts contractually due have not been paid. Debt and preferred equity investments are placed on a non-accrual status at the earlier of the date at which payments become 90 days past due or when, in the opinion of management, a full recovery of interest income becomes doubtful. Interest income recognition is resumed on any debt or preferred equity investment that is on non-accrual status when such debt or preferred equity investment becomes contractually current and performance is demonstrated to be resumed.

We may syndicate a portion of the loans that we originate or sell the loans individually. When a transaction meets the criteria for sale accounting, we recognize gain or loss based on the difference between the sales price and the carrying value of the loan sold. Any related unamortized deferred origination fees, original issue discounts, loan origination costs, discounts or premiums at the time of sale are recognized as an adjustment to the gain or loss on sale, which is included in investment income

on the consolidated statement of operations. Any fees received at the time of sale or syndication are recognized as part of investment income.

Asset management fees are recognized on a straight-line basis over the term of the asset management agreement.

Debt and Preferred Equity Investments

Debt and preferred equity investments are presented at the net amount expected to be collected in accordance with ASC 326. An allowance for loan losses is deducted from the amortized cost basis of the financial assets to present the net carrying value at the amount expected to be collected through the expected maturity date of such investments. The expense for loan loss and other investment reserves is the charge to earnings to adjust the allowance for loan losses to the appropriate level. Amounts are written off from the allowance when we de-recognize the related investment either as a result of a sale of the investment or acquisition of equity interests in the collateral.

The Company evaluates the amount expected to be collected based on current market and economic conditions, historical loss information, and reasonable and supportable forecasts. The Company's assumptions are derived from both internal data and external data which may include, among others, governmental economic projections for the New York City Metropolitan area, public data on recent transactions and filings for securitized debt instruments. This information is aggregated by asset class and adjusted for duration. Based on these inputs, loans are evaluated at the individual asset level. In certain instances, we may also use a probability-weighted model that considers the likelihood of multiple outcomes and the amount expected to be collected for each outcome.

The evaluation of the possible credit deterioration associated with the performance and/or value of the underlying collateral property as well as the financial and operating capability of the borrower/sponsor requires significant judgment, which include both asset level and market assumptions over the relevant time period.

In addition, quarterly, the Company assigns each loan a risk rating. Based on a 3-point scale, loans are rated “1” through “3,” from lower risk to higher risk, which ratings are defined as follows: 1 - Low Risk Assets - Low probability of loss, 2 - Watch List Assets - Higher potential for loss, 3 - High Risk Assets - Loss more likely than not. Loans with risk ratings of 2 or above are evaluated to determine whether the expected risk of loss is appropriately captured through the combination of our expectations of current conditions, historical loss information and supportable forecasts described above or whether risk characteristics specific to the loan warrant the use of a probability-weighted model.

Financing investments that are classified as held for sale are carried at the expected amount to be collected or fair market value using available market information obtained through consultation with dealers or other originators of such investments as well as discounted cash flow models based on Level 3 data pursuant to ASC 820-10. As circumstances change, management may conclude not to sell an investment designated as held for sale. In such situations, the investment will be reclassified at its expected amount to be collected.

Other financing receivables that are included in balance sheet line items other than the Debt and Preferred Equity Investments line are also measured at the net amount expected to be collected.

Accrued interest receivable amounts related to these debt and preferred equity investment and other financing receivables are recorded at the net amount expected to be collected within Other assets in the consolidated balance sheets. Accrued interest receivables that are written off are recognized as an expense in loan loss and other investment reserves.

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 its 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 its 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.

We have elected, and may elect in the future, to treat certain of our 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 months ended March 31, 2021, we recorded a Federal, state and local tax provision of $0.7 million. During the three months ended March 31, 2020, we recorded a Federal, state and local provision of $1.1 million.

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 initial and ongoing evaluations of the credit quality 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 potential source of funds to offset the economic costs associated with lost revenue from that tenant and the costs associated with re-tenanting a space. The properties in our real estate portfolio are located in the New York metropolitan area. The tenants located in our buildings operate in various industries. Other than one tenant, Viacom CBS Inc., which accounts for 5.9% 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 March 31, 2021.

For the three months ended March 31, 2021, the following properties contributed more than 5.0% of our annualized cash rent from office properties, including our share of annualized cash rent from joint venture office properties:

Property	Three months ended March 31, 2021
11 Madison Avenue	9.2%
420 Lexington Avenue (Graybar)	7.2%
1185 Avenue of the Americas	7.1%
1515 Broadway	6.9%
220 East 42nd Street	6.2%
280 Park Avenue	5.8%
485 Lexington Avenue	5.1%

Reclassification

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

Accounting Standards Updates

In August 2020, the FASB issued Accounting Standard Update, or "ASU," No. 2020-06 Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40). ASU 2020-06 simplifies the accounting for convertible instruments by reducing the number of accounting models for convertible debt instruments and convertible preferred stock, removes certain settlement conditions that are required for equity contracts to qualify for the derivative scope exception and also simplifies the diluted earnings per share calculation in certain areas. ASU 2020-06 is effective for reporting periods beginning after December 15, 2021, with early adoption permitted. We are currently evaluating the impact of the adoption of ASU 2020-06 on our consolidated financial statements, but do not believe the adoption of this standard will have a material impact on our consolidated financial statements.

In March 2020, the FASB issued ASU No. 2020-04 Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting and then in January 2021, the FASB issued ASU No. 2021-01. The amendments provide practical expedients for reference rate reform related activities that impact debt, leases, derivatives and other contracts. The guidance is optional and is effective between March 12, 2020 and December 31, 2022. The guidance may be elected over time as reference rate reform activities occur. During the first quarter of 2020, the Company elected to apply the hedge accounting expedients related to probability and the assessments of effectiveness for future LIBOR-indexed cash flows to assume that the index upon which future hedged transactions will be based matches the index on the corresponding derivatives. Application of these expedients preserves the presentation of derivatives consistent with past presentation. The Company continues to evaluate the impact of the guidance and may apply other elections as applicable as additional changes in the market occur.

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Property Acquisitions

3 Months Ended

Mar. 31, 2021

Business Combinations [Abstract]

Property Acquisitions

Property Acquisitions

The following table summarizes the properties acquired during the three months ended March 31, 2021:

Property	Acquisition Date	Property Type	Approximate Square Feet	Gross Asset Valuation (in millions)
885 Third Avenue (1)	January 2021	Fee Interest	625,000	$	387.9

(1)In January 2021, pursuant to the partnership documents of our 885 Third Avenue investment, certain participating rights of the common member expired. As a result, it was determined that this investment is a VIE of which we are the primary beneficiary, and the investment was consolidated in our financial statements. Upon consolidating the entity, the assets and liabilities of the entity were recorded at fair value. Prior to January 2021, the investment was accounted for under the equity method. See Note 6, "Investments in Unconsolidated Joint Ventures" and Note 16, "Fair Value Measurements."

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Properties Held for Sale and Property Dispositions

3 Months Ended

Mar. 31, 2021

Discontinued Operations and Disposal Groups [Abstract]

Properties Held for Sale and Property Dispositions

Properties Held for Sale and Property Dispositions

Properties Held for Sale

As of March 31, 2021, no properties were classified as held for sale.

Property Dispositions

The following table summarizes the properties disposed of during the three months ended March 31, 2021:

Property	Disposition Date	Property Type	Approximate Square Feet	Gross Asset Valuation (in millions)		(Loss) Gain (in millions)
712 Madison Avenue (1)	January 2021	Fee Interest	6,600	$	43.0	$	(1.4)
133 Greene Street (2)	February 2021	Fee Interest	6,425	15.8		0.2
106 Spring Street (2)	March 2021	Fee Interest	5,928	35.0		(2.8)

(1)Disposition resulted from the buyer exercising its purchase option under a ground lease arrangement.

(2)In the first quarter of 2021, the property was foreclosed on by the lender in conjunction with the related debt extinguishment.

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Debt and Preferred Equity Investments

3 Months Ended

Mar. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Debt and Preferred Equity Investments

Debt and Preferred Equity Investments

Below is a summary of the activity in our debt and preferred equity investments for the three months ended March 31, 2021 and the twelve months ended December 31, 2020 (in thousands):

	March 31, 2021		December 31, 2020
Balance at beginning of year (1)	$	1,076,542	$	1,580,306
Debt investment originations/fundings/accretion (2)	17,465		389,300
Preferred equity investment originations/accretion (2)	3,195		167,042
Redemptions/sales/syndications/equity ownership/amortization (3)	—		(1,048,643)
Net change in loan loss reserves	—		(11,463)
Balance at end of period (1)	$	1,097,202	$	1,076,542

(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, but did not meet the conditions for sale accounting, are included in Other assets and Other liabilities on the consolidated balance sheets.

Below is a summary of our debt and preferred equity investments as of March 31, 2021 (dollars in thousands):

	Floating Rate					Fixed Rate					Total Carrying Value		Senior Financing		Weighted Average Yield at End of Period	Maturity (1)
Type	Carrying Value		Face Value		Interest Rate	Carrying Value		Face Value		Interest Rate
Senior Mortgage Debt	$	64,042	$	64,649	L + 2.00% - 3.50%	$	1,249	$	1,250	3.50%	$	65,291	$	—	4.74%	2021 - 2022
Junior Mortgage Debt	7,207		12,000		L + 7.25%	42,819		43,000		6.25%	50,026		127,000		7.82%	2021
Mezzanine Debt	281,401		285,179		L + 4.95% - 13.61%	437,503		449,102		2.90% - 14.30%	718,904		4,476,210		5.86%	2021 - 2029
Preferred Equity	—		—		—	262,981		265,052		6.50% - 11.00%	262,981		1,962,750		9.94%	2022 - 2027
Balance at end of period	$	352,650	$	361,828		$	744,552	$	758,404		$	1,097,202	$	6,565,960

(1)Excludes available extension options to the extent they have not been exercised as of the date of this filing.

The following table is a rollforward of our total allowance for loan losses for the three months ended March 31, 2021 and the twelve months ended December 31, 2020 (in thousands):

	March 31, 2021		December 31, 2020
Balance at beginning of year	$	13,213	$	1,750
Cumulative adjustment upon adoption of ASC 326	—		27,803
Current period provision for loan loss	—		20,693
Write-offs charged against the allowance(1)	—		(37,033)
Balance at end of period(2)	$	13,213	$	13,213

(1)Includes $19.0 million of charges recorded against investments that were sold during the year ended December 31, 2020. These charges are included in loan loss and other investment reserves, net of recoveries, in our consolidated statements of operations for the year ended December 31, 2020.

(2)As of March 31, 2021, we had recorded an allowance for loan loss on all financing receivables on non-accrual except for one debt investment with a carrying value of $225.4 million.

At March 31, 2021 and December 31, 2020, all debt and preferred equity investments were performing in accordance with their respective terms, with the exception of one investment with a carrying value, net of reserves, of $6.8 million, as discussed in the Debt Investments table further below.

No other financing receivables were 90 days past due at March 31, 2021 and December 31, 2020 with the exception of a $27.7 million financing receivable which was put on nonaccrual in August 2018 as a result of interest default.

The following table sets forth the carrying value of our debt and preferred equity investment portfolio by risk rating as of March 31, 2021 and December 31, 2020 (dollars in thousands):

Risk Rating	March 31, 2021		December 31, 2020
1 - Low Risk Assets - Low probability of loss	$	712,994	$	695,035
2 - Watch List Assets - Higher potential for loss	367,859		365,167
3 - High Risk Assets - Loss more likely than not	16,349		16,340
	$	1,097,202	$	1,076,542

The following table sets forth the carrying value of our debt and preferred equity investment portfolio by year of origination and risk rating as of March 31, 2021 (dollars in thousands):

	As of March 31, 2021
Risk Rating	2021(1)		2020(1)		2019(1)		Prior(1)		Total
1 - Low Risk Assets - Low probability of loss	$	—	$	361,444	$	56,639	$	294,911	$	712,994
2 - Watch List Assets - Higher potential for loss	—		—		241,285		126,574		367,859
3 - High Risk Assets - Loss more likely than not	—		—		—		16,349		16,349
	$	—	$	361,444	$	297,924	$	437,834	$	1,097,202

(1) Year in which the investment was originated or acquired by us or in which a material modification occurred.

We have determined that we have one portfolio segment of financing receivables at March 31, 2021 and December 31, 2020 comprised of commercial real estate which is primarily recorded in debt and preferred equity investments.

Included in Other assets is an additional amount of financing receivables representing loans to joint venture partners totaling $66.4 million and $66.2 million at March 31, 2021 and December 31, 2020, respectively. The Company recorded provisions for loan losses related to these financing receivables of $0.0 million and $2.8 million for the three months ended March 31, 2021 and 2020, respectively. All of these loans have a risk rating of 2 and were performing in accordance with their respective terms with the exception of one financing receivable, which was put on nonaccrual in August 2018, that has a risk rating of 3 and a carrying value at March 31, 2021 of $2.5 million.

Debt Investments

    As of March 31, 2021 and December 31, 2020, we held the following debt investments with an aggregate weighted average current yield of 5.90% at March 31, 2021 (dollars in thousands):

Loan Type	March 31, 2021 Future Funding Obligations		March 31, 2021 Senior Financing		March 31, 2021 Carrying Value (1)		December 31, 2020 Carrying Value (1)		Maturity Date (2)
Fixed Rate Investments:
Junior Mortgage (3a)	$	—	$	67,000	$	42,820	$	32,888	July 2021
Mezzanine Loan	—		15,000		3,500		3,500		September 2021
Mortgage/Mezzanine Loan	—		63,750		56,246		56,244		October 2021
Mezzanine Loan	—		280,000		41,652		41,057		August 2022
Mezzanine Loan (4)	—		359,237		225,367		225,204		June 2023
Mezzanine Loan (3b)(5)	—		105,000		13,366		13,366		June 2024
Mezzanine Loan	—		95,000		30,000		30,000		January 2025
Mezzanine Loan	—		1,712,750		55,250		55,250		June 2027
Mezzanine Loan	—		85,000		20,000		20,000		December 2029
Total fixed rate	$	—	$	2,782,737	$	488,201	$	477,509
Floating Rate Investments:
Mezzanine Loan (6)	$	—	$	275,000	$	49,992	$	49,956	April 2021
Junior Mortgage Participation/Mezzanine Loan	—		60,000		15,742		15,733		July 2021
Mezzanine Loan	5,761		177,415		36,639		35,318		July 2021
Mezzanine Loan	—		61,744		29,130		29,106		July 2021
Mezzanine Loan (3c)	—		1,115,000		129,330		127,915		March 2022
Mortgage and Mezzanine Loan	6,769		—		60,922		60,532		May 2022
Mortgage and Mezzanine Loan	42,117		—		15,918		14,011		December 2022
Mezzanine Loan	52,288		71,314		21,560		19,889		May 2023
Total floating rate	$	106,935	$	1,760,473	$	359,233	$	352,460
Allowance for loan loss	$	—	$	—	$	(13,213)	$	(13,213)
Total	$	106,935	$	4,543,210	$	834,221	$	816,756

(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)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) $66.6 million (b) $12.0 million, and (c) $0.4 million.

(4)This loan was put on non-accrual in July 2020 and remains on non-accrual at March 31, 2021. No investment income has been recognized subsequent to it being put on non-accrual.

(5)This loan went into default and was put on non-accrual in June 2020 and remains on non-accrual at March 31, 2021. No investment income has been recognized subsequent to it being put on non-accrual. The Company is in discussions with the borrower.

(6)In April 2021, the maturity date of this loan was extended one year to April 2022.

Preferred Equity Investments

As of March 31, 2021 and December 31, 2020, we held the following preferred equity investments with an aggregate weighted average current yield of 9.94% at March 31, 2021 (dollars in thousands):

Type	March 31, 2021 Future Funding Obligations		March 31, 2021 Senior Financing		March 31, 2021 Carrying Value (1)		December 31, 2020 Carrying Value (1)		Mandatory Redemption (2)
Preferred Equity	$	—	$	1,712,750	$	156,169	$	154,691	June 2022
Preferred Equity	—		250,000		106,812		105,095		February 2027
Total Preferred Equity	$	—	$	1,962,750	$	262,981	$	259,786
Allowance for loan loss	$	—	$	—	$	—	$	—
Total	$	—	$	1,962,750	$	262,981	$	259,786

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

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

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Investments in Unconsolidated Joint Ventures

3 Months Ended

Mar. 31, 2021

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 March 31, 2021, the book value of these investments was $3.7 billion, net of investments with negative book values totaling $92.4 million for which we have an implicit commitment to fund future capital needs.

As of March 31, 2021 and December 31, 2020, 800 Third Avenue, 21 East 66th Street, 605 West 42nd Street, 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 $132.7 million and $134.0 million as of March 31, 2021 and December 31, 2020, respectively. Our maximum loss is limited to the amount of our equity investment in these VIEs. See the "Principles of Consolidation" section of Note 2, "Significant Accounting Policies." 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 March 31, 2021:

Property	Partner	Ownership Interest (1)	Economic Interest (1)	Unaudited Approximate Square Feet
100 Park Avenue	Prudential Real Estate Investors	49.90%	49.90%	834,000
717 Fifth Avenue	Wharton Properties/Private Investor	10.92%	10.92%	119,500
800 Third Avenue	Private Investors	60.52%	60.52%	526,000
919 Third Avenue	New York State Teacher's Retirement System	51.00%	51.00%	1,454,000
11 West 34th Street	Private Investor/Wharton Properties	30.00%	30.00%	17,150
280 Park Avenue	Vornado Realty Trust	50.00%	50.00%	1,219,158
1552-1560 Broadway (2)	Wharton Properties	50.00%	50.00%	57,718
10 East 53rd Street	Canadian Pension Plan Investment Board	55.00%	55.00%	354,300
21 East 66th Street (3)	Private Investors	32.28%	32.28%	13,069
650 Fifth Avenue (4)	Wharton Properties	50.00%	50.00%	69,214
121 Greene Street	Wharton Properties	50.00%	50.00%	7,131
Stonehenge Portfolio	Various	Various	Various	1,439,016
605 West 42nd Street (5)	The Moinian Group	20.00%	20.00%	927,358
11 Madison Avenue	PGIM Real Estate	60.00%	60.00%	2,314,000
400 East 57th Street (6)	BlackRock, Inc and Stonehenge Partners	51.00%	41.00%	290,482
One Vanderbilt	National Pension Service of Korea/Hines Interest LP	71.01%	71.01%	1,657,198
Worldwide Plaza	RXR Realty / New York REIT / Private Investor	24.35%	24.35%	2,048,725
1515 Broadway	Allianz Real Estate of America	56.87%	56.87%	1,750,000
2 Herald Square	Israeli Institutional Investor	51.00%	51.00%	369,000

Property	Partner	Ownership Interest (1)	Economic Interest (1)	Unaudited Approximate Square Feet
115 Spring Street	Private Investor	51.00%	51.00%	5,218
15 Beekman (7)	A fund managed by Meritz Alternative Investment Management	20.00%	20.00%	221,884
85 Fifth Avenue	Wells Fargo	36.30%	36.30%	12,946
One Madison Avenue (8)	National Pension Service of Korea/Hines Interest LP	50.50%	50.50%	1,048,700

(1)Ownership interest and economic interest represent the Company's interests in the joint venture as of March 31, 2021. Changes in ownership or economic interests within the current year are disclosed in the notes below.

(2)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.

(3)We hold a 32.28% interest in three retail units and one residential unit at the property and a 16.14% interest in three residential units at the property.

(4)The joint venture owns a long-term leasehold interest in the retail space at 650 Fifth Avenue.

(5)In April 2021, we entered into contract to sell our interest in the property. This transaction is expected to close in the second quarter of 2021 subject to customary closing conditions.

(6)In October 2016, we sold a 49% interest in this property. Our 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. Our joint venture with Stonehenge remains consolidated resulting in the combined 51% interest being shown within investments in unconsolidated joint ventures on our balance sheet. In April 2021, we entered into contract to sell our interest in the property. In connection with this contract, we recorded a charge of $5.7 million, which is included in depreciable real estate reserves and impairment in the consolidated statements of operations. This transaction is expected to close in the third quarter of 2021 subject to customary closing conditions.

(7)In 2020, the Company formed a joint venture, which then entered into a long-term sublease with the Company.

(8)In 2020, the Company admitted partners to the One Madison Avenue development project, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and the deconsolidation of our remaining 50.5% interest. We recorded our investment at fair value, which resulted in the recognition of a fair value adjustment of $187.5 million in 2020 and a fair value adjustment of $2.7 million during the three months ended March 31, 2021. The fair value of our investment was determined by the terms of the joint venture agreement governing the capitalization of the project. The partners have committed aggregate equity to the project totaling no less than $492.2 million and their ownership interest in the joint venture is based on their capital contributions, up to an aggregate maximum of 49.5%. At March 31, 2021, the total of the two partners' ownership interests based on equity contributed was 9.0%.

Disposition of Joint Venture Interests or Properties

The following table summarizes the investments in unconsolidated joint ventures disposed of during the three months ended March 31, 2021:

Property	Ownership Interest Disposed	Disposition Date	Gross Asset Valuation (in thousands)		Gain (Loss) on Sale (in thousands) (1)
885 Third Avenue (2)	N/A	January 2021	N/A		N/A
55 West 46th Street - Tower 46	25.0%	March 2021	$	275.0	$	(15.2)

(1)Represents the Company's share of the gain or loss.

(2)In January 2021, pursuant to the partnership documents of our 885 Third Avenue investment, certain participating rights of the common member expired. As a result, it was determined that we are the primary beneficiary of the VIE and the investment was consolidated in our financial statements. See Note 3, "Property Acquisitions."

Joint Venture Mortgages and Other Loans Payable

We generally finance our joint ventures with non-recourse debt. In certain cases we may provide guarantees or master leases for tenant space, which terminate upon the satisfaction of specified circumstances or repayment of the underlying loans. The mortgage notes and other loans payable collateralized by the respective joint venture properties and assignment of leases at March 31, 2021 and December 31, 2020, respectively, are as follows (dollars in thousands):

Property	Economic Interest (1)		Initial Maturity Date	Final Maturity Date (2)	Interest Rate (3)			March 31, 2021		December 31, 2020
Fixed Rate Debt:
717 Fifth Avenue (mortgage)	10.92	%	July 2022	July 2022		4.45	%	$	300,000	$	300,000
717 Fifth Avenue (mezzanine)	10.92	%	July 2022	July 2022		5.50	%	355,328		355,328
650 Fifth Avenue (mortgage)	50.00	%	October 2022	October 2022		4.46	%	210,000		210,000
650 Fifth Avenue (mezzanine)	50.00	%	October 2022	October 2022		5.45	%	65,000		65,000
21 East 66th Street	32.28	%	April 2023	April 2028		3.60	%	12,000		12,000

Property	Economic Interest (1)		Initial Maturity Date	Final Maturity Date (2)	Interest Rate (3)			March 31, 2021		December 31, 2020
919 Third Avenue	51.00	%	June 2023	June 2023		5.12	%	500,000		500,000
1515 Broadway	56.87	%	March 2025	March 2025		3.93	%	815,876		820,607
11 Madison Avenue	60.00	%	September 2025	September 2025		3.84	%	1,400,000		1,400,000
800 Third Avenue	60.52	%	February 2026	February 2026		3.37	%	177,000		177,000
400 East 57th Street (4)	41.00	%	November 2026	November 2026		3.00	%	97,024		97,024
Worldwide Plaza	24.35	%	November 2027	November 2027		3.98	%	1,200,000		1,200,000
Stonehenge Portfolio (5)	Various		Various	Various		3.50	%	195,899		195,899
885 Third Avenue (6)								—		272,000
Total fixed rate debt								$	5,328,127	$	5,604,858
Floating Rate Debt:
280 Park Avenue	50.00	%	September 2021	September 2024	L+	1.73	%	$	1,200,000	$	1,200,000
One Vanderbilt (7)	71.01	%	September 2021	September 2023	L+	2.50	%	1,283,292		1,210,329
1552 Broadway	50.00	%	October 2021	October 2022	L+	2.65	%	195,000		195,000
2 Herald Square	51.00	%	November 2021	November 2023	L+	1.45	%	214,500		214,500
11 West 34th Street	30.00	%	January 2022	January 2023	L+	1.45	%	23,000		23,000
121 Greene Street (8)	50.00	%	November 2022	November 2022	L+	2.00	%	13,771		15,000
115 Spring Street	51.00	%	September 2023	September 2023	L+	3.40	%	65,550		65,550
100 Park Avenue	49.90	%	December 2023	December 2025	L+	2.25	%	360,000		360,000
15 Beekman (9)	20.00	%	January 2024	July 2025	L+	1.50	%	19,165		11,212
10 East 53rd Street	55.00	%	February 2025	February 2025	L+	1.35	%	220,000		220,000
One Madison Avenue (10)	50.50	%	November 2025	November 2026	L+	3.35	%	40,104		—
605 West 42nd Street (11)	20.00	%	August 2027	August 2027	L+	1.44	%	550,000		550,000
21 East 66th Street	32.28	%	June 2033	June 2033	T+	2.75	%	666		677
55 West 46th Street								—		192,524
Total floating rate debt								$	4,185,048	$	4,257,792
Total joint venture mortgages and other loans payable								$	9,513,175	$	9,862,650
Deferred financing costs, net								(98,252)		(113,446)
Total joint venture mortgages and other loans payable, net								$	9,414,923	$	9,749,204

(1)Economic interest represents the Company's interests in the joint venture as of March 31, 2021. Changes in ownership or economic interests, if any, within the current year are disclosed in the notes to the investment in unconsolidated joint ventures table above.

(2)Reflects exercise of all available options. The ability to exercise extension options may be subject to certain tests based on the operating performance of the property.

(3)Interest rates as of March 31, 2021, taking into account interest rate hedges in effect during the period. Floating rate debt is presented with the stated spread over the 30-day LIBOR ("L") or 1-year Treasury ("T").

(4)In April 2021, we entered into a contract to sell our interest in the property. This transaction is expected to close in the third quarter of 2021 subject to customary closing conditions.

(5)Comprised of three mortgages totaling $132.4 million that mature in April 2028 and two mortgages totaling $63.5 million that mature in July 2029.

(6)This loan was repaid in the first quarter of 2021, and as of March 31, 2021, the property is consolidated in our financial statements. See Note 3, "Property Acquisitions."

(7)This loan is a $1.75 billion construction facility with reductions in interest cost based on meeting certain conditions, the first of which has been satisfied, and has an initial term of three years with two one year extension options. Advances under the loan are subject to costs incurred. In conjunction with the loan, we provided partial guarantees for interest and principal payments, the amounts of which are based on certain construction milestones and operating metrics.

(8)In March 2021, the maturity date of this loan was extended by one year.

(9)This loan is a $125.0 million construction facility. Advances under the loan are subject to costs incurred.

(10)The loan is a $1.25 billion construction facility with an initial term of five years with one one year extension option. Advances under the loan are subject to costs incurred. In conjunction with the loan, we provided partial guarantees for interest and principal payments, the amounts of which are based on certain construction milestones and operating metrics.

(11)In April 2021, we entered into contract to sell our interest in the property. This transaction is expected to close in the second quarter of 2021 subject to customary closing conditions.

We are entitled to receive fees for providing management, leasing, construction supervision and asset management services to certain of our joint ventures. We earned $2.4 million from these services, net of our ownership share of the joint ventures, for the three months ended March 31, 2021. We earned $2.2 million from these services, net of our ownership share of the joint ventures, for the three months ended March 31, 2020. 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 March 31, 2021 and December 31, 2020 are as follows (in thousands):

	March 31, 2021		December 31, 2020
Assets (1)
Commercial real estate property, net	$	15,243,331	$	16,143,880
Cash and restricted cash	317,753		357,076
Tenant and other receivables, related party receivables, and deferred rents receivable	412,203		403,883
Other assets	1,950,444		2,001,612
Total assets	$	17,923,731	$	18,906,451
Liabilities and equity (1)
Mortgages and other loans payable, net	$	9,414,923	$	9,749,204
Deferred revenue	1,311,191		1,341,571
Lease liabilities	985,622		1,002,563
Other liabilities	373,400		464,107
Equity	5,838,595		6,349,006
Total liabilities and equity	$	17,923,731	$	18,906,451
Company's investments in unconsolidated joint ventures	$	3,698,701	$	3,823,322

(1)At March 31, 2021, $174.2 million of net unamortized basis differences between the amount at which our investments are carried and our share of equity in net assets of the underlying property will be amortized through equity in net income (loss) from unconsolidated joint ventures over the remaining life of the underlying items having given rise to the differences.

The combined statements of operations for the unconsolidated joint ventures, from acquisition date through the three months ended March 31, 2021 and 2020, are as follows (in thousands):

	Three Months Ended March 31,
	2021		2020
Total revenues	$	301,541	$	282,520
Operating expenses	46,233		51,590
Real estate taxes	54,592		53,372
Operating lease rent	5,644		6,361
Interest expense, net of interest income	78,749		86,324
Amortization of deferred financing costs	6,384		4,814
Depreciation and amortization	114,879		98,584
Total expenses	306,481		301,045
Net loss before gain on sale	$	(4,940)	$	(18,525)
Company's equity in net loss from unconsolidated joint ventures	$	(2,864)	$	(12,814)

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Deferred Costs

3 Months Ended

Mar. 31, 2021

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

Deferred Costs

Deferred Costs

Deferred costs at March 31, 2021 and December 31, 2020 consisted of the following (in thousands):

	March 31, 2021		December 31, 2020
Deferred leasing costs	$	448,197	$	447,002
Less: accumulated amortization	(277,945)		(269,834)
Deferred costs, net	$	170,252	$	177,168

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Mortgages and Other Loans Payable

3 Months Ended

Mar. 31, 2021

Mortgages and Other Loans Payable

Mortgages and Other Loans Payable

Mortgages and Other Loans Payable

The mortgages and other loans payable collateralized by the respective properties and assignment of leases or debt investments at March 31, 2021 and December 31, 2020, respectively, were as follows (dollars in thousands):

Property	Initial Maturity Date	Final Maturity Date (1)	Interest Rate (2)		March 31, 2021		December 31, 2020
Fixed Rate Debt:
100 Church Street	July 2022	July 2022		4.68%	$	203,697	$	204,875
420 Lexington Avenue	October 2024	October 2040		3.99%	292,672		294,035
Landmark Square	January 2027	January 2027		4.90%	100,000		100,000
485 Lexington Avenue	February 2027	February 2027		4.25%	450,000		450,000
1080 Amsterdam (3)	February 2027	February 2027		3.59%	34,773		34,773
Total fixed rate debt					$	1,081,142	$	1,083,683
Floating Rate Debt:
185 Broadway (4)	November 2021	November 2023	L+	2.85%	$	168,870	$	158,478
609 Fifth Avenue	March 2022	March 2022	L+	2.95%	57,651		57,651
220 East 42nd Street	June 2023	June 2025	L+	2.75%	510,000		510,000
719 Seventh Avenue	September 2023	September 2023	L+	1.20%	50,000		50,000
133 Greene Street					—		15,523
106 Spring Street					—		38,025
FHLB Facility					—		10,000
FHLB Facility					—		15,000
FHLB Facility					—		35,000
712 Madison Avenue					—		28,000
2017 Master Repurchase Agreement (5)					—		—
Total floating rate debt					$	786,521	$	917,677
Total mortgages and other loans payable					$	1,867,663	$	2,001,360
Deferred financing costs, net of amortization					(18,962)		(21,388)
Total mortgages and other loans payable, net					$	1,848,701	$	1,979,972

(1)Reflects exercise of all available options. The ability to exercise extension options may be subject to certain tests based on the operating performance of the property.

(2)Interest rate as of March 31, 2021, taking into account interest rate hedges in effect during the period. Floating rate debt is presented with the stated spread over the 30-day LIBOR, unless otherwise specified.

(3)The loan is comprised of a $33.9 million mortgage loan and $0.9 million mezzanine loan with a fixed interest rate of 350 basis points and 700 basis points, respectively, for the first five years and is prepayable without penalty at the end of fifth year.

(4)This loan is a $225.0 million construction facility, with reductions in interest cost based on meeting certain conditions, and has an initial three year term with two one year extension options. Advances under the loan are subject to incurred costs and funded equity requirements.

(5)In June 2020, we exercised a one year extension option which extended the maturity date to June 2021. At March 31, 2021, there was no outstanding balance on the $400 million facility.

At March 31, 2021 and December 31, 2020, the gross book value of the properties and debt and preferred equity investments collateralizing the mortgages and other loans payable was approximately $2.4 billion and $2.5 billion, respectively.

Federal Home Loan Bank of New York ("FHLB") Facility

As of December 31, 2020, the Company’s wholly-owned subsidiary, Ticonderoga Insurance Company, or Ticonderoga, a Vermont licensed captive insurance company, was a member of the Federal Home Loan Bank of New York, or FHLBNY. As a member, Ticonderoga was able to borrow funds from the FHLBNY in the form of secured advances that bore interest at a floating rate. As a result of a Final Ruling from the Federal Housing Finance Authority, the regulator of the Federal Home Loan Bank system, all captive insurance company memberships were terminated as of February 2021. As such, all advances to Ticonderoga were repaid prior to such termination.

Master Repurchase Agreement

The Company entered into a Master Repurchase Agreement, or MRA, known as the 2017 MRA, which provides us with the ability to sell certain mortgage 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 facility 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 collateralize 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. As of March 31, 2021, there have been no margin calls on the 2017 MRA.

In April 2018, we increased the maximum facility capacity from $300.0 million to $400.0 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 is scheduled to mature in June 2021, with a one-year extension option. At March 31, 2021, the facility had no outstanding balance.

Corporate Indebtedness

2017 Credit Facility

In November 2017, we entered into an amendment to the credit facility, referred to as the 2017 credit facility, that was originally entered into by the Company in November 2012, or the 2012 credit facility. As of March 31, 2021, the 2017 credit facility consisted of a $1.5 billion revolving credit facility, a $1.3 billion term loan (or "Term Loan A"), and a $200.0 million term loan (or "Term Loan B") with maturity dates of March 31, 2022, March 31, 2023, and November 21, 2024, respectively. The revolving credit facility has two six-month, as-of-right extension options to March 31, 2023. We also have an option, subject to customary conditions, to increase the capacity of the credit facility to $4.5 billion at any time prior to the maturity dates for the revolving credit facility and term loans without the consent of existing lenders, by obtaining additional commitments from our existing lenders and other financial institutions.

As of March 31, 2021, the 2017 credit facility bore interest at a spread over 30-day LIBOR ranging from (i) 82.5 basis points to 155 basis points for loans under the revolving credit facility, (ii) 90 basis points to 175 basis points for loans under Term Loan A, and (iii) 85 basis points to 165 basis points for loans under Term Loan B, in each case based on the credit rating assigned to the senior unsecured long term indebtedness of the Company. In instances where there are either only two ratings available or where there are more than two and the difference between them is one rating category, the applicable rating shall be the highest rating. In instances where there are more than two ratings and the difference between the highest and the lowest is two or more rating categories, then the applicable rating used is the average of the highest two, rounded down if the average is not a recognized category.

At March 31, 2021, the applicable spread was 100 basis points for the revolving credit facility, 110 basis points for Term Loan A, and 100 basis points for Term Loan B. 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 the Company. As of March 31, 2021, the facility fee was 20 basis points.

As of March 31, 2021, we had $16.5 million of outstanding letters of credit, $630.0 million drawn under the revolving credit facility and $1.5 billion outstanding under the term loan facilities, with total undrawn capacity of $0.9 billion under the 2017 credit facility. At March 31, 2021 and December 31, 2020, the revolving credit facility had a carrying value of $625.8 million and $105.3 million, respectively, net of deferred financing costs. At March 31, 2021 and December 31, 2020, the term loan facilities had a carrying value of $1.5 billion and $1.5 billion, respectively, net of deferred financing costs.

The Company and the Operating Partnership are borrowers jointly and severally obligated under the 2017 credit facility. The 2017 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 March 31, 2021 and December 31, 2020, respectively, by scheduled maturity date (dollars in thousands):

Issuance	March 31, 2021 Unpaid Principal Balance		March 31, 2021 Accreted Balance		December 31, 2020 Accreted Balance		Interest Rate (1)			Initial Term (in Years)	Maturity Date
August 7, 2018 (2) (3)	$	350,000	$	350,000	$	350,000		1.52	%	3	August 2021
October 5, 2017 (2)	500,000		499,830		499,803			3.25	%	5	October 2022
November 15, 2012 (4)	300,000		301,817		302,086			4.50	%	10	December 2022
December 17, 2015 (5)	100,000		100,000		100,000			4.27	%	10	December 2025
	$	1,250,000	$	1,251,647	$	1,251,889
Deferred financing costs, net			(3,025)		(3,670)
	$	1,250,000	$	1,248,622	$	1,248,219

(1)Interest rate as of March 31, 2021, taking into account interest rate hedges in effect during the period.

(2)Issued by the Operating Partnership with the Company as the guarantor.

(3)The notes are subject to redemption at the Company's option, in whole but not in part, at a redemption price equal to 100% of the principal amount of the notes, plus unpaid accrued interest thereon to the redemption date. In April 2020, the Company entered into $350.0 million of fixed rate interest swaps at a rate of 0.54375% through August 2021.

(4)In October 2017, the Company and the Operating Partnership as co-obligors issued an additional $100.0 million of 4.50% senior unsecured notes due December 2022. The notes were priced at 105.334% of par.

(5)Issued by the Company and the Operating Partnership as co-obligors.

Restrictive Covenants

The terms of the 2017 credit facility 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 March 31, 2021 and December 31, 2020, 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. 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, the 2017 credit facility, trust preferred securities, senior unsecured notes and our share of joint venture debt as of March 31, 2021, including as-of-right extension options, were as follows (in thousands):

	Scheduled Amortization		Mortgages and Other Loans Payable		Revolving Credit Facility		Unsecured Term Loans		Trust Preferred Securities		Senior Unsecured Notes		Total		Joint Venture Debt
Remaining 2021	$	8,031	$	168,870	$	—	$	—	$	—	$	350,000	$	526,901	$	1,126,896
2022	8,765		255,435		—		—		—		800,000		1,064,200		227,701
2023	6,594		560,000		630,000		1,300,000		—		—		2,496,594		491,066
2024	5,280		272,749		—		200,000		—		—		478,029		620,843
2025	823		—		—		—		—		100,000		100,823		1,403,266
Thereafter	924		580,192		—		—		100,000		—		681,116		552,813
	$	30,417	$	1,837,246	$	630,000	$	1,500,000	$	100,000	$	1,250,000	$	5,347,663	$	4,422,585

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

	Three Months Ended March 31,
	2021		2020
Interest expense before capitalized interest	$	39,868	$	56,813
Interest on financing leases	1,492		1,663
Interest capitalized	(17,583)		(20,483)
Interest income	(389)		(499)
Interest expense, net	$	23,388	$	37,494

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Corporate Indebtedness

3 Months Ended

Mar. 31, 2021

Debt Disclosure [Abstract]

Corporate Indebtedness

Mortgages and Other Loans Payable

The mortgages and other loans payable collateralized by the respective properties and assignment of leases or debt investments at March 31, 2021 and December 31, 2020, respectively, were as follows (dollars in thousands):

Property	Initial Maturity Date	Final Maturity Date (1)	Interest Rate (2)		March 31, 2021		December 31, 2020
Fixed Rate Debt:
100 Church Street	July 2022	July 2022		4.68%	$	203,697	$	204,875
420 Lexington Avenue	October 2024	October 2040		3.99%	292,672		294,035
Landmark Square	January 2027	January 2027		4.90%	100,000		100,000
485 Lexington Avenue	February 2027	February 2027		4.25%	450,000		450,000
1080 Amsterdam (3)	February 2027	February 2027		3.59%	34,773		34,773
Total fixed rate debt					$	1,081,142	$	1,083,683
Floating Rate Debt:
185 Broadway (4)	November 2021	November 2023	L+	2.85%	$	168,870	$	158,478
609 Fifth Avenue	March 2022	March 2022	L+	2.95%	57,651		57,651
220 East 42nd Street	June 2023	June 2025	L+	2.75%	510,000		510,000
719 Seventh Avenue	September 2023	September 2023	L+	1.20%	50,000		50,000
133 Greene Street					—		15,523
106 Spring Street					—		38,025
FHLB Facility					—		10,000
FHLB Facility					—		15,000
FHLB Facility					—		35,000
712 Madison Avenue					—		28,000
2017 Master Repurchase Agreement (5)					—		—
Total floating rate debt					$	786,521	$	917,677
Total mortgages and other loans payable					$	1,867,663	$	2,001,360
Deferred financing costs, net of amortization					(18,962)		(21,388)
Total mortgages and other loans payable, net					$	1,848,701	$	1,979,972

(1)Reflects exercise of all available options. The ability to exercise extension options may be subject to certain tests based on the operating performance of the property.

(2)Interest rate as of March 31, 2021, taking into account interest rate hedges in effect during the period. Floating rate debt is presented with the stated spread over the 30-day LIBOR, unless otherwise specified.

(3)The loan is comprised of a $33.9 million mortgage loan and $0.9 million mezzanine loan with a fixed interest rate of 350 basis points and 700 basis points, respectively, for the first five years and is prepayable without penalty at the end of fifth year.

(4)This loan is a $225.0 million construction facility, with reductions in interest cost based on meeting certain conditions, and has an initial three year term with two one year extension options. Advances under the loan are subject to incurred costs and funded equity requirements.

(5)In June 2020, we exercised a one year extension option which extended the maturity date to June 2021. At March 31, 2021, there was no outstanding balance on the $400 million facility.

At March 31, 2021 and December 31, 2020, the gross book value of the properties and debt and preferred equity investments collateralizing the mortgages and other loans payable was approximately $2.4 billion and $2.5 billion, respectively.

Federal Home Loan Bank of New York ("FHLB") Facility

As of December 31, 2020, the Company’s wholly-owned subsidiary, Ticonderoga Insurance Company, or Ticonderoga, a Vermont licensed captive insurance company, was a member of the Federal Home Loan Bank of New York, or FHLBNY. As a member, Ticonderoga was able to borrow funds from the FHLBNY in the form of secured advances that bore interest at a floating rate. As a result of a Final Ruling from the Federal Housing Finance Authority, the regulator of the Federal Home Loan Bank system, all captive insurance company memberships were terminated as of February 2021. As such, all advances to Ticonderoga were repaid prior to such termination.

Master Repurchase Agreement

The Company entered into a Master Repurchase Agreement, or MRA, known as the 2017 MRA, which provides us with the ability to sell certain mortgage 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 facility 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 collateralize 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. As of March 31, 2021, there have been no margin calls on the 2017 MRA.

In April 2018, we increased the maximum facility capacity from $300.0 million to $400.0 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 is scheduled to mature in June 2021, with a one-year extension option. At March 31, 2021, the facility had no outstanding balance.

Corporate Indebtedness

2017 Credit Facility

In November 2017, we entered into an amendment to the credit facility, referred to as the 2017 credit facility, that was originally entered into by the Company in November 2012, or the 2012 credit facility. As of March 31, 2021, the 2017 credit facility consisted of a $1.5 billion revolving credit facility, a $1.3 billion term loan (or "Term Loan A"), and a $200.0 million term loan (or "Term Loan B") with maturity dates of March 31, 2022, March 31, 2023, and November 21, 2024, respectively. The revolving credit facility has two six-month, as-of-right extension options to March 31, 2023. We also have an option, subject to customary conditions, to increase the capacity of the credit facility to $4.5 billion at any time prior to the maturity dates for the revolving credit facility and term loans without the consent of existing lenders, by obtaining additional commitments from our existing lenders and other financial institutions.

As of March 31, 2021, the 2017 credit facility bore interest at a spread over 30-day LIBOR ranging from (i) 82.5 basis points to 155 basis points for loans under the revolving credit facility, (ii) 90 basis points to 175 basis points for loans under Term Loan A, and (iii) 85 basis points to 165 basis points for loans under Term Loan B, in each case based on the credit rating assigned to the senior unsecured long term indebtedness of the Company. In instances where there are either only two ratings available or where there are more than two and the difference between them is one rating category, the applicable rating shall be the highest rating. In instances where there are more than two ratings and the difference between the highest and the lowest is two or more rating categories, then the applicable rating used is the average of the highest two, rounded down if the average is not a recognized category.

At March 31, 2021, the applicable spread was 100 basis points for the revolving credit facility, 110 basis points for Term Loan A, and 100 basis points for Term Loan B. 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 the Company. As of March 31, 2021, the facility fee was 20 basis points.

As of March 31, 2021, we had $16.5 million of outstanding letters of credit, $630.0 million drawn under the revolving credit facility and $1.5 billion outstanding under the term loan facilities, with total undrawn capacity of $0.9 billion under the 2017 credit facility. At March 31, 2021 and December 31, 2020, the revolving credit facility had a carrying value of $625.8 million and $105.3 million, respectively, net of deferred financing costs. At March 31, 2021 and December 31, 2020, the term loan facilities had a carrying value of $1.5 billion and $1.5 billion, respectively, net of deferred financing costs.

The Company and the Operating Partnership are borrowers jointly and severally obligated under the 2017 credit facility. The 2017 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 March 31, 2021 and December 31, 2020, respectively, by scheduled maturity date (dollars in thousands):

Issuance	March 31, 2021 Unpaid Principal Balance		March 31, 2021 Accreted Balance		December 31, 2020 Accreted Balance		Interest Rate (1)			Initial Term (in Years)	Maturity Date
August 7, 2018 (2) (3)	$	350,000	$	350,000	$	350,000		1.52	%	3	August 2021
October 5, 2017 (2)	500,000		499,830		499,803			3.25	%	5	October 2022
November 15, 2012 (4)	300,000		301,817		302,086			4.50	%	10	December 2022
December 17, 2015 (5)	100,000		100,000		100,000			4.27	%	10	December 2025
	$	1,250,000	$	1,251,647	$	1,251,889
Deferred financing costs, net			(3,025)		(3,670)
	$	1,250,000	$	1,248,622	$	1,248,219

(1)Interest rate as of March 31, 2021, taking into account interest rate hedges in effect during the period.

(2)Issued by the Operating Partnership with the Company as the guarantor.

(3)The notes are subject to redemption at the Company's option, in whole but not in part, at a redemption price equal to 100% of the principal amount of the notes, plus unpaid accrued interest thereon to the redemption date. In April 2020, the Company entered into $350.0 million of fixed rate interest swaps at a rate of 0.54375% through August 2021.

(4)In October 2017, the Company and the Operating Partnership as co-obligors issued an additional $100.0 million of 4.50% senior unsecured notes due December 2022. The notes were priced at 105.334% of par.

(5)Issued by the Company and the Operating Partnership as co-obligors.

Restrictive Covenants

The terms of the 2017 credit facility 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 March 31, 2021 and December 31, 2020, 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. 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, the 2017 credit facility, trust preferred securities, senior unsecured notes and our share of joint venture debt as of March 31, 2021, including as-of-right extension options, were as follows (in thousands):

	Scheduled Amortization		Mortgages and Other Loans Payable		Revolving Credit Facility		Unsecured Term Loans		Trust Preferred Securities		Senior Unsecured Notes		Total		Joint Venture Debt
Remaining 2021	$	8,031	$	168,870	$	—	$	—	$	—	$	350,000	$	526,901	$	1,126,896
2022	8,765		255,435		—		—		—		800,000		1,064,200		227,701
2023	6,594		560,000		630,000		1,300,000		—		—		2,496,594		491,066
2024	5,280		272,749		—		200,000		—		—		478,029		620,843
2025	823		—		—		—		—		100,000		100,823		1,403,266
Thereafter	924		580,192		—		—		100,000		—		681,116		552,813
	$	30,417	$	1,837,246	$	630,000	$	1,500,000	$	100,000	$	1,250,000	$	5,347,663	$	4,422,585

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

	Three Months Ended March 31,
	2021		2020
Interest expense before capitalized interest	$	39,868	$	56,813
Interest on financing leases	1,492		1,663
Interest capitalized	(17,583)		(20,483)
Interest income	(389)		(499)
Interest expense, net	$	23,388	$	37,494

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Related Party Transactions

3 Months Ended

Mar. 31, 2021

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, who serves as a member and as the chairman emeritus of our 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 the profit participation, which is included in Other income on the consolidated statements of operations, was $0.3 million and $0.9 million for the three months ended March 31, 2021 and 2020, respectively.

We also recorded expenses, inclusive of capitalized expenses, of $2.3 million and $3.9 million for the three months ended March 31, 2021 and 2020, respectively, for these services (excluding services provided directly to tenants).

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 $0.2 million for the three months ended March 31, 2021 and 2020, respectively.

One Vanderbilt Investment

In December 2016, we entered into agreements with entities owned and controlled by our Chairman and CEO, Marc Holliday, and our President, 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. The entities owned and controlled by Messrs. Holliday and Mathias paid $1.4 million and $1.0 million, respectively, which equal 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.

One Vanderbilt Lease

In November 2018, we entered into a lease agreement with the One Vanderbilt joint venture covering certain floors at the property. In March 2021, the lease commenced and we relocated our corporate headquarters to the leased space. For the three months ended March 31, 2021, we recorded $0.1 million of rent expense under the lease, which is included in Marketing, general and administrative in the consolidated statements of operations. See Note 19, “Commitments and Contingencies.”

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 Note 6, "Investments in Unconsolidated Joint Ventures." Amounts due from joint ventures and related parties at March 31, 2021 and December 31, 2020 consisted of the following (in thousands):

	March 31, 2021		December 31, 2020
Due from joint ventures	$	26,500	$	27,006
Other	7,810		7,651
Related party receivables	$	34,310	$	34,657

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Noncontrolling Interests on the Company's Consolidated Financial Statements

3 Months Ended

Mar. 31, 2021

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 March 31, 2021 and December 31, 2020, the noncontrolling interest unit holders owned 5.65%, or 4,156,282 units, and 5.44%, or 3,938,823 units, of the Operating Partnership, respectively, inclusive of retroactive adjustments to reflect the reverse stock split effectuated by SL Green in January 2021. As of March 31, 2021, 4,156,282 shares of our 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 our common stock at the end of the reporting period.

Below is a summary of the activity relating to the noncontrolling interests in the Operating Partnership for the three months ended March 31, 2021 and the twelve months ended December 31, 2020 (in thousands):

	March 31, 2021		December 31, 2020
Balance at beginning of period	$	358,262	$	409,862
Distributions	(4,148)		(12,652)
Issuance of common units	4,483		12,018
Redemption and conversion of common units	(13,261)		(36,085)
Net (loss) income	(476)		20,016
Accumulated other comprehensive income (loss) allocation	2,655		(2,299)
Fair value adjustment	26,609		(32,598)
Balance at end of period	$	374,124	$	358,262

Preferred Units of Limited Partnership Interest in the Operating Partnership

Below is a summary of the preferred units of limited partnership interest in the Operating Partnership as of March 31, 2021:

Issuance	Stated Distribution Rate		Number of Units Authorized	Number of Units Issued	Number of Units Outstanding	Annual Dividend Per Unit(1)		Liquidation Preference Per Unit(2)		Conversion Price Per Unit(3)		Date of Issuance
Series A (4)	3.50	%	109,161	109,161	109,161	$	35.0000	$	1,000.00	$	—	August 2015
Series F	7.00%		60	60	60	$	70.0000	$	1,000.00	$	29.12	January 2007
Series G (5)	4.50%		1,902,000	1,902,000	718,697	$	1.1250	$	25.00	$	88.50	January 2012
Series K	3.50%		700,000	563,954	341,677	$	0.8750	$	25.00	$	134.67	August 2014
Series L	4.00%		500,000	378,634	372,634	$	1.0000	$	25.00	$	—	August 2014
Series M	3.75%		1,600,000	1,600,000	96,357	$	0.9375	$	25.00	$	—	February 2015
Series P	4.00%		200,000	200,000	200,000	$	1.0000	$	25.00	$	—	July 2015
Series Q	3.50%		268,000	268,000	268,000	$	0.8750	$	25.00	$	148.95	July 2015
Series R	3.50%		400,000	400,000	400,000	$	0.8750	$	25.00	$	154.89	August 2015
Series S	4.00%		1,077,280	1,077,280	1,077,280	$	1.0000	$	25.00	$	—	August 2015
Series V	3.50%		40,000	40,000	40,000	$	0.8750	$	25.00	$	—	May 2019
Series W (6)	(6)		1	1	1	(6)		(6)		(6)		January 2020

(1)Dividends are cumulative, subject to certain provisions.

(2)Units are redeemable at any time at par for cash at the option of the unitholder unless otherwise specified.

(3)If applicable, 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) the amount shown in the table.

(4)Issued through a consolidated subsidiary. The units 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 March 31, 2021, no Subsidiary Series B Preferred Units have been issued.

(5)Common units of limited partnership interest in the Operating Partnership issued in a conversion may be redeemed in exchange for our 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.

(6)The Series W preferred unit was issued in January 2020 in exchange for the then-outstanding Series O preferred unit. The holder of the Series W preferred unit is entitled to quarterly dividends in an amount calculated as (i) 1,350 multiplied by (ii) the current distribution per common unit of limited partnership in SL Green Operating Partnership. The holder has the right to require the Operating Partnership to repurchase the Series W unit for cash, or convert the Series W unit for Class B units, in each case at a price that is determined based on the closing price of the Company's common stock at the time such right is exercised. The unit's liquidation preference is the fair market value of the unit plus accrued distributions at the time of a liquidation event.

Below is a summary of the activity relating to the preferred units in the Operating Partnership for the three months ended March 31, 2021 and the twelve months ended December 31, 2020 (in thousands):

	March 31, 2021		December 31, 2020
Balance at beginning of period	$	202,169	$	283,285
Issuance of preferred units	—		—
Redemption of preferred units	(3,631)		(82,750)
Dividends paid on preferred units	(1,731)		(6,163)
Accrued dividends on preferred units	1,696		7,797
Balance at end of period	$	198,503	$	202,169

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Stockholders' Equity of the Company

3 Months Ended

Mar. 31, 2021

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 March 31, 2021, 69,353,606 shares of common stock and no shares of excess stock were issued and outstanding.

On December 4, 2020 our Board of Directors declared an ordinary dividend and a special dividend (together, "the Total Dividend"). The Total Dividend was paid on January 15, 2021 to shareholders of record at the close of business on December 15, 2020 ("the Record Date"). Shareholders had the opportunity to elect to receive the Total Dividend in the form of all cash or all stock, subject to proration if either option was oversubscribed. Shareholders who elected to receive cash received, for each share of common stock they owned as of the Record Date, approximately $0.3735 in cash and 0.0279 shares of common stock. Shareholders who elected to receive shares received, for each share of common stock they owned as of the Record Date, approximately 0.0343 shares of common stock. The number of shares issued was calculated based on the volume weighted average trading price of SLG's common stock between January 5-7, 2021, of $58.15 per share.

To mitigate the dilutive impact of the common stock issued in the special dividend, the board of directors also authorized a reverse stock split, which was effective after markets closed on January 20, 2021. On January 8, 2021, a committee of the Board of Directors calculated the ratio for the reverse stock split of our issued and outstanding shares of common stock as 1.02918-for-1. After the issuance of the dividend and the completion of the reverse stock split, the number of shares of our common stock outstanding was equivalent to the number of total shares outstanding on the Record Date (not including any issuances or repurchases that occurred following the Record Date, as well as any fractional shares that would have been issued but for which cash-in-lieu was paid). However, on a relative basis, some individual shareholders may have more shares of SLG’s common stock, and some individual shareholders may have fewer shares of our common stock, depending on their individual elections to receive cash or stock and as a result of the cash option being oversubscribed.

All share-related references and measurements including the number of shares outstanding, share prices, number of shares repurchased, earnings per share, dividends per share, and share-based compensation awards, have been retroactively adjusted to reflect the reverse stock split for all periods presented in this Quarterly Report on Form 10-Q.

Share Repurchase Program

In August 2016, our Board of Directors approved a $1.0 billion share repurchase program under which we can buy shares of our common stock. The Board of Directors has since authorized five separate $500.0 million increases to the size of the share repurchase program in the fourth quarter of 2017, second quarter of 2018, fourth quarter of 2018, fourth quarter of 2019, and fourth quarter of 2020 bringing the total program size to $3.5 billion.

At March 31, 2021, share repurchases, excluding the redemption of OP units, executed under the program were as follows:

Period	Shares repurchased	Average price paid per share	Cumulative number of shares repurchased as part of the repurchase plan or programs
Year ended 2017	8,105,881	$104.61	8,105,881
Year ended 2018	9,468,617	$99.03	17,574,498

Year ended 2019	4,465,857	$86.06	22,040,355
Year Ended 2020	8,529,279	$62.39	30,569,634
Three months ended March 31, 2021	1,306,460	$61.46	31,876,094

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 any time, in whole or from time to time in part, at par for cash. 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 ("DRSPP")

In February 2018, 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 our common stock under the DRSPP. The DRSPP commenced on September 24, 2001.

The following table summarizes SL Green common stock issued, and proceeds received from dividend reinvestments and/or stock purchases under the DRSPP for the three months ended March 31, 2021 and 2020, respectively (dollars in thousands):

	Three Months Ended March 31,
	2021		2020
Shares of common stock issued	5,483		1,727
Dividend reinvestments/stock purchases under the DRSPP	$	351	$	166

Earnings per Share

We use the two-class method of computing earnings per share (“EPS”), which is an earnings allocation formula that determines EPS for common stock and any participating securities according to dividends declared (whether paid or unpaid). Under the two-class method, basic EPS is computed by dividing the income available to common stockholders by the weighted-average number of common stock shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur from share equivalent activity.

SL Green's earnings per share for the three months ended March 31, 2021 and 2020 are computed as follows (in thousands):

	Three Months Ended March 31,
Numerator	2021		2020
Basic Earnings:
Net (loss) income attributable to SL Green common stockholders	$	(7,464)	$	114,801
Less: distributed earnings allocated to participating securities	(371)		(113)
Less: undistributed earnings allocated to participating securities	—		(464)
Net (loss) income attributable to SL Green common stockholders (numerator for basic earnings per share)	$	(7,835)	$	114,224
Add back: dilutive effect of earnings allocated to participating securities	371		113
Add back: undistributed earnings allocated to participating securities	—		464
Add back: effect of dilutive securities (redemption of units to common shares)	(476)		6,202
Net (loss) income attributable to SL Green common stockholders (numerator for diluted earnings per share)	$	(7,940)	$	121,003

	Three Months Ended March 31,
Denominator	2021	2020
Basic Shares:
Weighted average common stock outstanding	69,010	75,656
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares	4,148	4,220
Stock-based compensation plans	595	476
Contingently issuable shares from special dividend declared December 4, 2020 and issued January 15, 2021	317	—
Diluted weighted average common stock outstanding	74,070	80,352

The Company has excluded 1,159,343 common stock equivalents from the calculation of diluted shares outstanding for the three months ended March 31, 2021, as they were anti-dilutive. The Company has excluded 1,170,579 common stock equivalents from the calculation of diluted shares outstanding for the three months ended March 31, 2020, as they were anti-dilutive.

Accumulated Other Comprehensive Loss

The following tables set forth the changes in accumulated other comprehensive loss by component as of March 31, 2021 (in thousands):

	Net unrealized loss on derivative instruments (1)		SL Green’s share of joint venture net unrealized loss on derivative instruments (2)		Net unrealized gain (loss) on marketable securities		Total
Balance at December 31, 2020	$	(57,415)	$	(10,853)	$	1,021	$	(67,247)
Other comprehensive income before reclassifications	9,771		33,024		(247)		42,548
Amounts reclassified from accumulated other comprehensive loss	4,196		1,606		—		5,802
Balance at March 31, 2021	$	(43,448)	$	23,777	$	774	$	(18,897)

(1)Amount reclassified from accumulated other comprehensive loss is included in interest expense in the respective consolidated statements of operations. As of March 31, 2021 and December 31, 2020, the deferred net gains from these terminated hedges, which is included in accumulated other comprehensive loss relating to net unrealized loss on derivative instrument, was $(0.6) million and $(0.5) million, respectively.

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

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Partners' Capital of the Operating Partnership

3 Months Ended

Mar. 31, 2021

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 March 31, 2021, 69,353,606 shares of common stock and no shares of excess stock were issued and outstanding.

On December 4, 2020 our Board of Directors declared an ordinary dividend and a special dividend (together, "the Total Dividend"). The Total Dividend was paid on January 15, 2021 to shareholders of record at the close of business on December 15, 2020 ("the Record Date"). Shareholders had the opportunity to elect to receive the Total Dividend in the form of all cash or all stock, subject to proration if either option was oversubscribed. Shareholders who elected to receive cash received, for each share of common stock they owned as of the Record Date, approximately $0.3735 in cash and 0.0279 shares of common stock. Shareholders who elected to receive shares received, for each share of common stock they owned as of the Record Date, approximately 0.0343 shares of common stock. The number of shares issued was calculated based on the volume weighted average trading price of SLG's common stock between January 5-7, 2021, of $58.15 per share.

To mitigate the dilutive impact of the common stock issued in the special dividend, the board of directors also authorized a reverse stock split, which was effective after markets closed on January 20, 2021. On January 8, 2021, a committee of the Board of Directors calculated the ratio for the reverse stock split of our issued and outstanding shares of common stock as 1.02918-for-1. After the issuance of the dividend and the completion of the reverse stock split, the number of shares of our common stock outstanding was equivalent to the number of total shares outstanding on the Record Date (not including any issuances or repurchases that occurred following the Record Date, as well as any fractional shares that would have been issued but for which cash-in-lieu was paid). However, on a relative basis, some individual shareholders may have more shares of SLG’s common stock, and some individual shareholders may have fewer shares of our common stock, depending on their individual elections to receive cash or stock and as a result of the cash option being oversubscribed.

All share-related references and measurements including the number of shares outstanding, share prices, number of shares repurchased, earnings per share, dividends per share, and share-based compensation awards, have been retroactively adjusted to reflect the reverse stock split for all periods presented in this Quarterly Report on Form 10-Q.

Share Repurchase Program

In August 2016, our Board of Directors approved a $1.0 billion share repurchase program under which we can buy shares of our common stock. The Board of Directors has since authorized five separate $500.0 million increases to the size of the share repurchase program in the fourth quarter of 2017, second quarter of 2018, fourth quarter of 2018, fourth quarter of 2019, and fourth quarter of 2020 bringing the total program size to $3.5 billion.

At March 31, 2021, share repurchases, excluding the redemption of OP units, executed under the program were as follows:

Period	Shares repurchased	Average price paid per share	Cumulative number of shares repurchased as part of the repurchase plan or programs
Year ended 2017	8,105,881	$104.61	8,105,881
Year ended 2018	9,468,617	$99.03	17,574,498

Year ended 2019	4,465,857	$86.06	22,040,355
Year Ended 2020	8,529,279	$62.39	30,569,634
Three months ended March 31, 2021	1,306,460	$61.46	31,876,094

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 any time, in whole or from time to time in part, at par for cash. 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 ("DRSPP")

In February 2018, 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 our common stock under the DRSPP. The DRSPP commenced on September 24, 2001.

The following table summarizes SL Green common stock issued, and proceeds received from dividend reinvestments and/or stock purchases under the DRSPP for the three months ended March 31, 2021 and 2020, respectively (dollars in thousands):

	Three Months Ended March 31,
	2021		2020
Shares of common stock issued	5,483		1,727
Dividend reinvestments/stock purchases under the DRSPP	$	351	$	166

Earnings per Share

We use the two-class method of computing earnings per share (“EPS”), which is an earnings allocation formula that determines EPS for common stock and any participating securities according to dividends declared (whether paid or unpaid). Under the two-class method, basic EPS is computed by dividing the income available to common stockholders by the weighted-average number of common stock shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur from share equivalent activity.

SL Green's earnings per share for the three months ended March 31, 2021 and 2020 are computed as follows (in thousands):

	Three Months Ended March 31,
Numerator	2021		2020
Basic Earnings:
Net (loss) income attributable to SL Green common stockholders	$	(7,464)	$	114,801
Less: distributed earnings allocated to participating securities	(371)		(113)
Less: undistributed earnings allocated to participating securities	—		(464)
Net (loss) income attributable to SL Green common stockholders (numerator for basic earnings per share)	$	(7,835)	$	114,224
Add back: dilutive effect of earnings allocated to participating securities	371		113
Add back: undistributed earnings allocated to participating securities	—		464
Add back: effect of dilutive securities (redemption of units to common shares)	(476)		6,202
Net (loss) income attributable to SL Green common stockholders (numerator for diluted earnings per share)	$	(7,940)	$	121,003

	Three Months Ended March 31,
Denominator	2021	2020
Basic Shares:
Weighted average common stock outstanding	69,010	75,656
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares	4,148	4,220
Stock-based compensation plans	595	476
Contingently issuable shares from special dividend declared December 4, 2020 and issued January 15, 2021	317	—
Diluted weighted average common stock outstanding	74,070	80,352

The Company has excluded 1,159,343 common stock equivalents from the calculation of diluted shares outstanding for the three months ended March 31, 2021, as they were anti-dilutive. The Company has excluded 1,170,579 common stock equivalents from the calculation of diluted shares outstanding for the three months ended March 31, 2020, as they were anti-dilutive.

Accumulated Other Comprehensive Loss

The following tables set forth the changes in accumulated other comprehensive loss by component as of March 31, 2021 (in thousands):

	Net unrealized loss on derivative instruments (1)		SL Green’s share of joint venture net unrealized loss on derivative instruments (2)		Net unrealized gain (loss) on marketable securities		Total
Balance at December 31, 2020	$	(57,415)	$	(10,853)	$	1,021	$	(67,247)
Other comprehensive income before reclassifications	9,771		33,024		(247)		42,548
Amounts reclassified from accumulated other comprehensive loss	4,196		1,606		—		5,802
Balance at March 31, 2021	$	(43,448)	$	23,777	$	774	$	(18,897)

(1)Amount reclassified from accumulated other comprehensive loss is included in interest expense in the respective consolidated statements of operations. As of March 31, 2021 and December 31, 2020, the deferred net gains from these terminated hedges, which is included in accumulated other comprehensive loss relating to net unrealized loss on derivative instrument, was $(0.6) million and $(0.5) million, respectively.

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

SL Green Operating Partnership

Stockholders' Equity

Partners' Capital of the Operating Partnership

Partners' Capital of the Operating Partnership

The Company is the sole managing general partner of the Operating Partnership and at March 31, 2021 owned 69,353,606 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.

All unit-related references and measurements including the number of units outstanding and earnings per unit have been retroactively adjusted to reflect the reverse stock split effectuated by SL Green’s board of directors in January 2021 for all periods presented in this Quarterly Report on Form 10-Q.

Limited Partner Units

As of March 31, 2021, limited partners other than SL Green owned 5.65%, or 4,156,282 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 months ended March 31, 2021 and 2020, respectively, are computed as follows (in thousands):

	Three Months Ended March 31,
Numerator	2021		2020
Basic Earnings:
Net (loss) income attributable to SLGOP common unitholders	$	(7,940)	$	121,003
Less: distributed earnings allocated to participating securities	(371)		(113)
Less: undistributed earnings allocated to participating securities	—		(464)
Net (loss) income attributable to SLGOP common unitholders (numerator for basic earnings per unit)	$	(8,311)	$	120,426
Add back: dilutive effect of earnings allocated to participating securities	371		113
Add back: undistributed earnings allocated to participating securities	—		464
Net (loss) income attributable to SLGOP common unitholders (numerator for diluted earnings per unit)	$	(7,940)	$	121,003

	Three Months Ended March 31,
Denominator	2021	2020
Basic units:
Weighted average common units outstanding	73,158	79,876
Effect of Dilutive Securities:
Stock-based compensation plans	595	476
Contingently issuable units from special distribution declared December 4, 2020 and issued January 15, 2021	317	—
Diluted weighted average common units outstanding	74,070	80,352

The Operating Partnership has excluded 1,159,343 common unit equivalents from the diluted units outstanding for the three months ended March 31, 2021 as they were anti-dilutive. The Operating Partnership has excluded 1,170,579 common unit equivalents from the diluted units outstanding for the three months ended March 31, 2020 as they were anti-dilutive.

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Share-based Compensation

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Abstract]

Share-based Compensation

Share-based CompensationWe have share-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.

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) 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., 10-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 our 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 March 31, 2021, 1.9 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.

Stock Options and Class O LTIP Units

Options are granted 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 years or ten years from the date of grant, are not transferable other than on death, and generally vest in one year 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.

There were no options granted during the three months ended March 31, 2021 or the year ended December 31, 2020.

A summary of the status of the Company's stock options as of March 31, 2021 and December 31, 2020, and changes during the three months ended March 31, 2021 and year ended December 31, 2020 are as follows:

	March 31, 2021			December 31, 2020
	Options Outstanding	Weighted Average Exercise Price		Options Outstanding	Weighted Average Exercise Price
Balance at beginning of period	784,995	$	102.62	1,007,665	$	105.35
Granted	—	—		—	—
Exercised	—	—		—	—
Lapsed or canceled	(9,716)	86.13		(222,670)	114.97
Balance at end of period	775,279	$	102.83	784,995	$	102.62
Options exercisable at end of period	775,278	$	102.83	782,022	$	102.62

The remaining weighted average contractual life of the options outstanding was 1.9 years and the remaining average contractual life of the options exercisable was 1.9 years.

During the three months ended March 31, 2021, we recognized no compensation expense related to options. During the three months ended March 31, 2020, we recognized compensation expense related to options of $0.02 million. As of March 31, 2021, there was no unrecognized compensation cost related to unvested stock options.

Restricted Shares

Shares are granted to certain employees, including our executives, and vesting occurs 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 March 31, 2021 and December 31, 2020 and changes during the three months ended March 31, 2021 and the year ended December 31, 2020, are as follows:

	March 31, 2021		December 31, 2020
Balance at beginning of period	3,439,674		3,465,347
Granted	145,845		8,959
Canceled	(12,437)		(34,632)
Balance at end of period	3,573,082		3,439,674
Vested during the period	117,487		128,891
Compensation expense recorded	$	2,067,125	$	10,895,459
Total fair value of restricted stock granted during the period	$	9,214,531	$	734,315

The fair value of restricted stock that vested during the three months ended March 31, 2021 and the year ended December 31, 2020 was $10.9 million and $12.5 million, respectively. As of March 31, 2021, there was $14.0 million of total unrecognized compensation cost related to restricted stock, which is expected to be recognized over a weighted average period of 2.0 years.

We granted LTIP Units, which include bonus, time-based and performance-based awards, with a fair value of $40.3 million and $37.0 million as of March 31, 2021 and December 31, 2020, 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 our 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 March 31, 2021, there was $65.9 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 2.0 years.

During the three months ended March 31, 2021, we recorded compensation expense related to bonus, time-based and performance based awards of $9.1 million. During the three months ended March 31, 2020, we recorded compensation expense related to bonus, time-based and performance based awards of $3.0 million.

For the three months ended March 31, 2021, $0.5 million was capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options. For the three months ended March 31, 2020, $0.6 million was capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options.

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 our 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 three months ended March 31, 2021, 18,290 phantom stock units and 12,064 shares of common stock were issued to our board of directors. We recorded compensation expense of $1.8 million during the three months ended March 31,

2021 related to the Deferred Compensation Plan. We recorded compensation expense of $1.8 million during the three months ended March 31, 2020 related to the Deferred Compensation Plan.

As of March 31, 2021, there were 159,066 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 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 March 31, 2021, 157,576 shares of our common stock had been issued under the ESPP.

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Accumulated Other Comprehensive Loss

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

Accumulated Other Comprehensive Loss

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 March 31, 2021, 69,353,606 shares of common stock and no shares of excess stock were issued and outstanding.

On December 4, 2020 our Board of Directors declared an ordinary dividend and a special dividend (together, "the Total Dividend"). The Total Dividend was paid on January 15, 2021 to shareholders of record at the close of business on December 15, 2020 ("the Record Date"). Shareholders had the opportunity to elect to receive the Total Dividend in the form of all cash or all stock, subject to proration if either option was oversubscribed. Shareholders who elected to receive cash received, for each share of common stock they owned as of the Record Date, approximately $0.3735 in cash and 0.0279 shares of common stock. Shareholders who elected to receive shares received, for each share of common stock they owned as of the Record Date, approximately 0.0343 shares of common stock. The number of shares issued was calculated based on the volume weighted average trading price of SLG's common stock between January 5-7, 2021, of $58.15 per share.

To mitigate the dilutive impact of the common stock issued in the special dividend, the board of directors also authorized a reverse stock split, which was effective after markets closed on January 20, 2021. On January 8, 2021, a committee of the Board of Directors calculated the ratio for the reverse stock split of our issued and outstanding shares of common stock as 1.02918-for-1. After the issuance of the dividend and the completion of the reverse stock split, the number of shares of our common stock outstanding was equivalent to the number of total shares outstanding on the Record Date (not including any issuances or repurchases that occurred following the Record Date, as well as any fractional shares that would have been issued but for which cash-in-lieu was paid). However, on a relative basis, some individual shareholders may have more shares of SLG’s common stock, and some individual shareholders may have fewer shares of our common stock, depending on their individual elections to receive cash or stock and as a result of the cash option being oversubscribed.

All share-related references and measurements including the number of shares outstanding, share prices, number of shares repurchased, earnings per share, dividends per share, and share-based compensation awards, have been retroactively adjusted to reflect the reverse stock split for all periods presented in this Quarterly Report on Form 10-Q.

Share Repurchase Program

In August 2016, our Board of Directors approved a $1.0 billion share repurchase program under which we can buy shares of our common stock. The Board of Directors has since authorized five separate $500.0 million increases to the size of the share repurchase program in the fourth quarter of 2017, second quarter of 2018, fourth quarter of 2018, fourth quarter of 2019, and fourth quarter of 2020 bringing the total program size to $3.5 billion.

At March 31, 2021, share repurchases, excluding the redemption of OP units, executed under the program were as follows:

Period	Shares repurchased	Average price paid per share	Cumulative number of shares repurchased as part of the repurchase plan or programs
Year ended 2017	8,105,881	$104.61	8,105,881
Year ended 2018	9,468,617	$99.03	17,574,498

Year ended 2019	4,465,857	$86.06	22,040,355
Year Ended 2020	8,529,279	$62.39	30,569,634
Three months ended March 31, 2021	1,306,460	$61.46	31,876,094

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 any time, in whole or from time to time in part, at par for cash. 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 ("DRSPP")

In February 2018, 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 our common stock under the DRSPP. The DRSPP commenced on September 24, 2001.

The following table summarizes SL Green common stock issued, and proceeds received from dividend reinvestments and/or stock purchases under the DRSPP for the three months ended March 31, 2021 and 2020, respectively (dollars in thousands):

	Three Months Ended March 31,
	2021		2020
Shares of common stock issued	5,483		1,727
Dividend reinvestments/stock purchases under the DRSPP	$	351	$	166

Earnings per Share

We use the two-class method of computing earnings per share (“EPS”), which is an earnings allocation formula that determines EPS for common stock and any participating securities according to dividends declared (whether paid or unpaid). Under the two-class method, basic EPS is computed by dividing the income available to common stockholders by the weighted-average number of common stock shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur from share equivalent activity.

SL Green's earnings per share for the three months ended March 31, 2021 and 2020 are computed as follows (in thousands):

	Three Months Ended March 31,
Numerator	2021		2020
Basic Earnings:
Net (loss) income attributable to SL Green common stockholders	$	(7,464)	$	114,801
Less: distributed earnings allocated to participating securities	(371)		(113)
Less: undistributed earnings allocated to participating securities	—		(464)
Net (loss) income attributable to SL Green common stockholders (numerator for basic earnings per share)	$	(7,835)	$	114,224
Add back: dilutive effect of earnings allocated to participating securities	371		113
Add back: undistributed earnings allocated to participating securities	—		464
Add back: effect of dilutive securities (redemption of units to common shares)	(476)		6,202
Net (loss) income attributable to SL Green common stockholders (numerator for diluted earnings per share)	$	(7,940)	$	121,003

	Three Months Ended March 31,
Denominator	2021	2020
Basic Shares:
Weighted average common stock outstanding	69,010	75,656
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares	4,148	4,220
Stock-based compensation plans	595	476
Contingently issuable shares from special dividend declared December 4, 2020 and issued January 15, 2021	317	—
Diluted weighted average common stock outstanding	74,070	80,352

The Company has excluded 1,159,343 common stock equivalents from the calculation of diluted shares outstanding for the three months ended March 31, 2021, as they were anti-dilutive. The Company has excluded 1,170,579 common stock equivalents from the calculation of diluted shares outstanding for the three months ended March 31, 2020, as they were anti-dilutive.

Accumulated Other Comprehensive Loss

The following tables set forth the changes in accumulated other comprehensive loss by component as of March 31, 2021 (in thousands):

	Net unrealized loss on derivative instruments (1)		SL Green’s share of joint venture net unrealized loss on derivative instruments (2)		Net unrealized gain (loss) on marketable securities		Total
Balance at December 31, 2020	$	(57,415)	$	(10,853)	$	1,021	$	(67,247)
Other comprehensive income before reclassifications	9,771		33,024		(247)		42,548
Amounts reclassified from accumulated other comprehensive loss	4,196		1,606		—		5,802
Balance at March 31, 2021	$	(43,448)	$	23,777	$	774	$	(18,897)

(1)Amount reclassified from accumulated other comprehensive loss is included in interest expense in the respective consolidated statements of operations. As of March 31, 2021 and December 31, 2020, the deferred net gains from these terminated hedges, which is included in accumulated other comprehensive loss relating to net unrealized loss on derivative instrument, was $(0.6) million and $(0.5) million, respectively.

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

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Fair Value Measurements

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value MeasurementsWe 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 March 31, 2021 and December 31, 2020 (in thousands):

	March 31, 2021
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities	$	23,784	$	—	$	23,784	$	—
Interest rate cap and swap agreements (included in Other assets)	$	365	$	—	$	365	$	—
Liabilities:
Interest rate cap and swap agreements (included in Other liabilities)	$	47,033	$	—	$	47,033	$	—

	December 31, 2020
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities	$	28,570	$	—	$	28,570	$	—
Interest rate cap and swap agreements (included in Other assets)	$	28	$	—	$	28	$	—
Liabilities:
Interest rate cap and swap agreements (included in Other liabilities)	$	61,217	$	—	$	61,217	$	—

We evaluate real estate investments and debt and preferred equity investments, including intangibles, for potential impairment 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.

In January 2021, pursuant to the partnership documents of our 885 Third Avenue investment, certain participating rights of the common member expired. As a result, it was determined that this investment is a VIE of which we are the primary beneficiary, and the investment was consolidated in our financial statements. Upon consolidating the entity, the assets and liabilities of the entity were recorded at fair value. This fair value was determined using a third party valuation which primarily utilized 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.

Marketable securities classified as Level 1 are derived from quoted prices in active markets. The valuation technique used to measure the fair value of 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. 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 March 31, 2021 and December 31, 2020 (in thousands):

	March 31, 2021				December 31, 2020
	Carrying Value (1)		Fair Value		Carrying Value (1)		Fair Value
Debt and preferred equity investments	$	1,097,202	(2)		$	1,076,542	(2)
Fixed rate debt	$	3,932,789	$	4,027,789	$	3,135,572	$	3,237,075
Variable rate debt	1,416,521		1,420,814		1,827,677		1,822,740
	$	5,349,310	$	5,448,603	$	4,963,249	$	5,059,815

(1)Amounts exclude net deferred financing costs.

(2)At March 31, 2021, debt and preferred equity investments had an estimated fair value ranging between $1.0 billion and $1.1 billion. At December 31, 2020, debt and preferred equity investments had an estimated fair value ranging between $1.0 billion and $1.1 billion.

Disclosure about fair value of financial instruments was based on pertinent information available to us as of March 31, 2021 and December 31, 2020. 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

3 Months Ended

Mar. 31, 2021

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 sheet 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 (loss) until the hedged item is 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 March 31, 2021 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 (dollars in thousands).

	Notional Value		Strike Rate		Effective Date	Expiration Date	Balance Sheet Location	Fair Value
Interest Rate Swap	$	350,000	0.544	%	April 2020	August 2021	Other Liabilities	$	(472)
Interest Rate Cap	111,869		3.500	%	December 2020	November 2021	Other Assets	—
Interest Rate Cap	510,000		3.000	%	June 2020	December 2021	Other Assets	—
Interest Rate Swap	200,000		0.138	%	February 2021	February 2022	Other Liabilities	(3)
Interest Rate Swap	100,000		0.136	%	February 2021	February 2022	Other Assets	—
Interest Rate Cap	85,000		4.000	%	March 2021	March 2022	Other Assets	—
Interest Rate Swap	100,000		0.212	%	January 2021	January 2023	Other Assets	95
Interest Rate Swap	400,000		0.160	%	February 2021	February 2023	Other Assets	270
Interest Rate Swap	200,000		1.131	%	July 2016	July 2023	Other Liabilities	(4,017)
Interest Rate Swap	100,000		1.161	%	July 2016	July 2023	Other Liabilities	(2,077)
Interest Rate Swap	150,000		2.696	%	January 2019	January 2024	Other Liabilities	(9,675)
Interest Rate Swap	150,000		2.721	%	January 2019	January 2026	Other Liabilities	(13,117)
Interest Rate Swap	200,000		2.740	%	January 2019	January 2026	Other Liabilities	(17,672)
								$	(46,668)

No gains or losses on the changes in the fair values were included in interest expense in the consolidated statements of operations during the three months ended March 31, 2021 or 2020.

The Company has agreements with each of its derivative counterparties that contain a provision where if the Company defaults on any of its indebtedness, then the Company could also be declared in default on its derivative obligations. As of March 31, 2021, 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 $48.3 million. As of March 31, 2021, the Company had 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 $49.0 million at March 31, 2021.

Gains and losses on terminated hedges are included in accumulated other comprehensive income (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 $16.6 million of the current balance held in accumulated other comprehensive loss will be reclassified into interest expense and $2.2 million of the portion related to

our share of joint venture accumulated other comprehensive loss will be reclassified into equity in net loss 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 March 31, 2021 and 2020, respectively (in thousands):

	Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)				Location of Loss Reclassified from Accumulated Other Comprehensive Loss into Income	Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income
	Three Months Ended March 31,					Three Months Ended March 31,
Derivative	2021		2020			2021		2020
Interest Rate Swaps/Caps	$	10,220	$	(45,082)	Interest expense	$	(4,388)	$	(725)
Share of unconsolidated joint ventures' derivative instruments	34,955		(7,089)		Equity in net loss from unconsolidated joint ventures	(1,700)		(711)
	$	45,175	$	(52,171)		$	(6,088)	$	(1,436)

The following table summarizes the notional value at inception and fair value of our joint ventures' derivative financial instruments at March 31, 2021 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 (dollars in thousands).

	Notional Value		Strike Rate		Effective Date	Expiration Date	Classification	Fair Value
Interest Rate Swap	$	177,000	1.669	%	March 2016	February 2026	Liability	$	(6,459)
Interest Rate Cap	375,000		2.600	%	August 2018	September 2021	Asset	—
Interest Rate Cap	20,026		2.600	%	April 2019	September 2021	Asset	—
Interest Rate Cap	198,000		4.000	%	August 2019	August 2022	Asset	2
Interest Rate Cap	220,000		4.000	%	February 2020	February 2022	Asset	—
Interest Rate Cap	550,000		3.750	%	August 2020	September 2023	Asset	138
Interest Rate Cap	1,075,000		3.750	%	September 2020	September 2021	Asset	—
Interest Rate Cap	125,000		3.750	%	September 2020	September 2021	Asset	—
Interest Rate Cap	1,250,000		1.250	%	November 2020	October 2024	Asset	5,764
Interest Rate Cap	23,000		4.750	%	January 2021	January 2023	Asset	1
Interest Rate Swap	2,250,000		1.611	%	June 2021	June 2031	Asset	42,635
								$	42,081

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Lease Income

3 Months Ended

Mar. 31, 2021

Leases [Abstract]

Lease Income

Lease Income

The Operating Partnership is the lessor and the sublessor to tenants under operating and sales-type leases. The minimum rental amounts due under the leases are generally subject to scheduled fixed increases or adjustments. The leases generally also require that the tenants reimburse us for increases in certain operating costs and real estate taxes above their base year costs.

The components of lease income from operating leases during the quarters ended March 31, 2021 and 2020 were as follows (in thousands):

	Three Months Ended March 31,
	2021		2020
Fixed lease payments	$	164,679	$	194,224
Variable lease payments	25,279		27,168
Total lease payments (1)	$	189,958	$	221,392
Amortization of acquired above and below-market leases	(1,869)		1,239
Total rental revenue	$	188,089	$	222,631

(1)Amounts include $65.8 million and $66.3 million of sublease income during the three months ended March 31, 2021 and 2020, respectively.

The components of lease income from sales-type leases during the quarters ended March 31, 2021 and 2020 were as follows (in thousands):

	Three Months Ended March 31,
	2021		2020
Interest income (1)	$	1,101	$	—

(1)These amounts are included in Other income in our consolidated statements of operations.

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Legal Proceedings

As of March 31, 2021, 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.

Lease Arrangements

We are a tenant under leases for certain properties, including ground leases. These leases have expirations from 2022 to 2119, or 2043 to 2119 as fully extended. Certain leases offer extension options which we assess against relevant economic factors to determine whether we are reasonably certain of exercising or not exercising the option. Lease payments associated with renewal periods that we are reasonably certain will be exercised, if any, are included in the measurement of the corresponding lease liability and right of use asset.

Certain of our leases are subject to rent resets, generally based on a percentage of the then fair market value, a fixed amount, or a percentage of the preceding rent at specified future dates. Rent resets will be recognized in the periods in which they are incurred.

The table below summarizes our current lease arrangements as of March 31, 2021:

Property (1)	Year of Current Expiration	Year of Final Expiration (2)
1185 Avenue of the Americas	2043	2043
SL Green Headquarters at One Vanderbilt (3)	2043	2048
625 Madison Avenue	2022	2054
420 Lexington Avenue	2050	2080
885 Third Avenue	2080	2080
711 Third Avenue (4)	2033	2083
461 Fifth Avenue (5)	2027	2084
1080 Amsterdam Avenue (6)	2111	2111
15 Beekman (7)(8)	2119	2119

(1)All leases are classified as operating leases unless otherwise specified.

(2)Reflects exercise of all available extension options.

(3)In March 2021, the Company's lease for its corporate headquarters at One Vanderbilt commenced. See note 10, "Related Party Transactions."

(4)The Company owns 50% of the fee interest.

(5)In April 2021, the Company exercised its option to acquire the fee interest in the property. The transaction is expected to close in the second quarter of 2021. The lease is classified as a financing lease.

(6)A portion of the lease is classified as a financing lease.

(7)The Company has an option to purchase the ground lease for a fixed price on a specific date. The lease is classified as a financing lease.

(8)In August 2020, the Company entered into a long-term sublease with an unconsolidated joint venture as part of the capitalization of the 15 Beekman development project. See Note 6, "Investments in Unconsolidated Joint Ventures."

The following is a schedule of future minimum lease payments as evaluated in accordance with ASC 842 for our financing leases and operating leases with initial terms in excess of one year as of March 31, 2021 (in thousands):

	Financing leases		Operating leases
Remaining 2021	$	31,136	$	31,954
2022	3,522		29,386
2023	3,570		29,502
2024	3,641		30,545
2025	3,810		30,772
2026	3,858		30,911
Thereafter	256,692		631,532
Total minimum lease payments	$	306,229	$	814,602
Amount representing interest	(153,607)
Amount discounted using incremental borrowing rate			(359,217)
Lease liabilities	$	152,622	$	455,385

The following table provides lease cost information for the Company's operating leases for the three months ended March 31, 2021 or 2020 (in thousands):

	Three Months Ended March 31,
Operating Lease Costs	2021		2020
Operating lease costs before capitalized operating lease costs	$	7,567	$	8,113
Operating lease costs capitalized	(828)		(746)
Operating lease costs, net (1)	$	6,739	$	7,367

(1)This amount is included in operating lease rent in our consolidated statements of operations.

The following table provides lease cost information for the Company's financing leases for the three months ended March 31, 2021 or 2020 (in thousands):

	Three Months Ended March 31,
Financing Lease Costs	2021		2020
Interest on financing leases before capitalized interest	$	1,492	$	1,663
Interest on financing leases capitalized	—		(747)
Interest on financing leases, net (1)	1,492		916
Amortization of right-of-use assets (2)	180		305
Financing lease costs, net	$	1,672	$	1,221

(1)These amounts are included in interest expense, net of interest income in our consolidated statements of operations.

(2)These amounts are included in depreciation and amortization in our consolidated statements of operations.

As of March 31, 2021, the weighted-average discount rate used to calculate the lease liabilities was 4.52%. As of March 31, 2021, the weighted-average remaining lease term was 27 years, inclusive of purchase options expected to be exercised.

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Segment Information

3 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Segment Information

Segment Information

The Company has two reportable segments, real estate and debt and preferred equity investments. We evaluate real estate performance and allocate resources based on earnings contributions.

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 months ended March 31, 2021 and 2020, and selected asset information as of March 31, 2021 and December 31, 2020, regarding our operating segments are as follows (in thousands):

	Real Estate Segment		Debt and Preferred Equity Segment		Total Company
Total revenues
Three months ended:
March 31, 2021	$	206,829	$	19,273	$	226,102
March 31, 2020	275,770		38,533		314,303
Net (loss) income
Three months ended:
March 31, 2021	$	(20,027)	$	16,172	$	(3,855)
March 31, 2020	111,233		15,881		127,114
Total assets
As of:
March 31, 2021	$	10,896,203	$	1,147,842	$	12,044,045
December 31, 2020	10,579,899		1,127,668		11,707,567

Interest costs for the debt and preferred equity segment include actual costs incurred for borrowings on the 2017 MRA and the FHLB Facility. Interest is imputed on the investments that do not collateralize the 2017 MRA and the FHLB Facility using our weighted average 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 because the use of personnel and resources is dependent on transaction volume between the two segments and varies between periods. In addition, we base performance on the individual segments prior to allocating marketing, general and administrative expenses. For the three months ended March 31, 2021, marketing, general and administrative expenses totaled $22.9 million. For the three months ended March 31, 2020, marketing, general and administrative expenses totaled $19.6 million. All other expenses, except interest, relate entirely to the real estate assets.

There were no transactions between the above two segments.

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Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2021

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 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

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 3 years 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 1 year to 15 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 1 year to 15 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 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.

The Company classifies those leases under which the Company is the lessee at lease commencement as finance or operating leases. Leases qualify as finance leases if the lease transfers ownership of the asset at the end of the lease term, the lease grants an option to purchase the asset that we are reasonably certain to exercise, the lease term is for a major part of the remaining economic life of the asset, or the present value of the lease payments exceeds substantially all of the fair value of the asset. Leases that do not qualify as finance leases are deemed to be operating leases. At lease commencement the Company records a lease liability which is measured as the present value of the lease payments and a right of use asset which is measured as the amount of the lease liability and any initial direct costs incurred. The Company applies a discount rate to determine the present value of the lease payments. If the rate implicit in the lease is known, the Company uses that rate. If the rate implicit in the lease is not known, the Company uses a discount rate reflective of the Company’s collateralized borrowing rate given the term of the lease. To determine the discount rate, the Company employs a third party specialist to develop an analysis based primarily on the observable borrowing rates of the Company, other REITs, and other corporate borrowers with long-term borrowings. On the consolidated statements of operations, operating leases are expensed through operating lease rent while financing leases are expensed through amortization and interest expense. On the consolidated balance sheets, financing leases include the amounts previously captioned "Properties under capital lease." When applicable, the Company combines the consideration for lease and non-lease components in the calculation of the value of the lease obligation and right-of-use asset.

On a periodic basis, we assess whether there are any indications that the value of our real estate properties may be 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 fair value of the property as calculated in accordance with Accounting Standards Codification, or ASC 820. We also

evaluate our real estate properties for impairment when a property has been classified as held for sale. Real estate assets held for sale are valued at the lower of their carrying value or fair value less costs to sell and depreciation expense is no longer recorded.

Cash and Cash Equivalents

Cash and Cash Equivalents

We consider all highly liquid investments with maturity of three months or less when purchased to be cash equivalents.

Restricted Cash

Restricted Cash

Restricted cash primarily consists of security deposits held on behalf of our tenants, interest reserves, as well as capital improvement and real estate tax escrows required under certain loan agreements.

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 March 31, 2021, 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 ASC 820-10, with the net unrealized gains or losses reported as a component of accumulated other comprehensive income or loss. The cost of marketable securities sold and the amount reclassified out of accumulated other comprehensive income into earnings is determined using the specific identification method. Credit losses are recognized in accordance with ASC 326.

Investments in Unconsolidated Joint Ventures

Investments in Unconsolidated Joint VenturesWe 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 each joint ventures' actual and projected cash flows.

Deferred Lease Costs and Lease Classification

Deferred Lease Costs

Deferred lease costs consist of incremental fees and direct costs that would not have been incurred if the lease had not been obtained and are amortized on a straight-line basis over the related lease term.

Lease Classification

Lease classification for leases under which the Company is the lessor is evaluated at lease commencement and leases not classified as sales-type leases or direct financing leases are classified as operating leases. Leases qualify as sales-type leases if the contract includes either transfer of ownership clauses, certain purchase options, a lease term representing a major part of the economic life of the asset, or the present value of the lease payments and residual guarantees provided by the lessee exceeds substantially all of the fair value of the asset. Additionally, leasing an asset so specialized that it is not deemed to have any value to the Company at the end of the lease term may also result in classification as a sales-type lease. Leases qualify as direct financing leases when the present value of the lease payments and residual value guarantees provided by the lessee and unrelated third parties exceeds substantially all of the fair value of the asset and collection of the payments is probable.

Revenue Recognition

Revenue Recognition

Rental revenue for operating leases is recognized on a straight-line basis over the term of the lease. Rental revenue recognition commences when the leased space is available for its intended use by the lessee.

To determine whether the leased space is available for its intended use by the lessee, management evaluates whether we are the owner of tenant improvements for accounting purposes or if the tenant is. When management concludes that we are the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of the finished space, which is when such tenant improvements are substantially complete. In certain instances, when management concludes that we are not the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of or controls the space.

When management concludes that we are the owner of tenant improvements for accounting purposes, we record amounts funded to construct the tenant improvements as a capital asset. For these tenant improvements, we record amounts reimbursed by tenants as a reduction of the capital asset. When management concludes that the tenant is the owner of tenant improvements for accounting purposes, we record our contribution towards those improvements as a lease incentive, which is included in deferred costs, net on our consolidated balance sheets and amortized as a reduction to rental revenue on a straight-line basis over the term of the lease.

The excess of rents recognized over amounts contractually due pursuant to the underlying leases are included in deferred rents receivable on the consolidated balance sheets.

In addition to base rent, our tenants also generally will pay variable rent which represents their pro rata share of increases in real estate taxes and certain operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in certain building operating expenses, the tenant will pay additional rent based upon increases in the

wage rate paid to porters over the porters' wage rate in effect during a base year or increases in the consumer price index over the index value in effect during a base year. In addition, many of our leases contain fixed percentage increases over the base rent to cover escalations. Electricity is most often supplied by the landlord either on a sub-metered basis, or rent inclusion basis (i.e., a fixed fee is included in the rent for electricity, which amount may increase based upon increases in electricity rates or increases in electrical usage by the tenant). Base building services other than electricity (such as heat, air conditioning and freight elevator service during business hours, and base building cleaning) are typically provided at no additional cost, with the tenant paying additional rent only for services which exceed base building services or for services which are provided outside normal business hours. These escalations are based on actual expenses incurred in the prior calendar year. If the expenses in the current year are different from those in the prior year, then during the current year, the escalations will be adjusted to reflect the actual expenses for the current year.

Rental revenue is recognized if collectability is probable. If collectability of substantially all of the lease payments is assessed as not probable, any difference between the rental revenue recognized to date and the lease payments that have been collected is recognized as a current-period adjustment to rental revenue. A subsequent change in the assessment of collectability to probable may result in a current-period adjustment to rental revenue for any difference between the rental revenue that would have been recognized if collectability had always been assessed as probable and the rental revenue recognized to date.

We recognize lease concessions related to COVID-19, such as rent deferrals and abatements, in accordance with the Lease Modification Q&A issued by the FASB in April 2020, which provides entities with the option to elect to account for lease concessions as though the enforceable rights and obligations existed in the original lease. This election is only available when total cash flows resulting from the modified lease are substantially similar to the cash flows in the original lease. When total cash flows resulting from the modified lease are not substantially similar to the cash flows in the original lease, we account for the concession agreement as a new lease.

The Company provides its tenants with certain customary services for lease contracts such as common area maintenance and general security. We have elected to combine the non-lease components with the lease components of our operating lease agreements and account for them as a single lease component in accordance with ASC 842.

We record a gain or loss on sale of real estate assets when we no longer have a controlling financial interest in the entity owning the real estate, a contract exists with a third party and that third party has control of the assets acquired.

Investment income on debt and preferred equity investments is accrued based on the contractual terms of the instruments and when it is deemed collectible. Some debt and preferred equity investments provide for accrual of interest at specified rates, which differ from current payment terms. Interest is recognized on such loans at the accrual rate subject to management's determination that accrued interest is collectible. If management cannot make this determination, interest income above the current pay rate is recognized only upon actual receipt.

Deferred origination fees, original issue discounts and loan origination costs, if any, are recognized as an adjustment to interest income over the terms of the related investments using the effective interest method. Fees received in connection with loan commitments are also deferred until the loan is funded and are then recognized over the term of the loan as an adjustment to yield. Discounts or premiums associated with the purchase of loans are amortized or accreted into interest income as a yield adjustment on the effective interest method based on expected cash flows through the expected maturity date of the related investment. If we purchase a debt or preferred equity investment at a discount, intend to hold it until maturity and expect to recover the full value of the investment, we accrete the discount into income as an adjustment to yield over the term of the investment. If we purchase a debt or preferred equity investment at a discount with the intention of foreclosing on the collateral, we do not accrete the discount. For debt investments acquired at a discount for credit quality, the difference between contractual cash flows and expected cash flows at acquisition is not accreted. Anticipated exit fees, the collection of which is expected, are also recognized over the term of the loan as an adjustment to yield.

We consider a debt and preferred equity investment to be past due when amounts contractually due have not been paid. Debt and preferred equity investments are placed on a non-accrual status at the earlier of the date at which payments become 90 days past due or when, in the opinion of management, a full recovery of interest income becomes doubtful. Interest income recognition is resumed on any debt or preferred equity investment that is on non-accrual status when such debt or preferred equity investment becomes contractually current and performance is demonstrated to be resumed.

We may syndicate a portion of the loans that we originate or sell the loans individually. When a transaction meets the criteria for sale accounting, we recognize gain or loss based on the difference between the sales price and the carrying value of the loan sold. Any related unamortized deferred origination fees, original issue discounts, loan origination costs, discounts or premiums at the time of sale are recognized as an adjustment to the gain or loss on sale, which is included in investment income

on the consolidated statement of operations. Any fees received at the time of sale or syndication are recognized as part of investment income.

Asset management fees are recognized on a straight-line basis over the term of the asset management agreement.

Debt and Preferred Equity Investments

Debt and Preferred Equity Investments

Debt and preferred equity investments are presented at the net amount expected to be collected in accordance with ASC 326. An allowance for loan losses is deducted from the amortized cost basis of the financial assets to present the net carrying value at the amount expected to be collected through the expected maturity date of such investments. The expense for loan loss and other investment reserves is the charge to earnings to adjust the allowance for loan losses to the appropriate level. Amounts are written off from the allowance when we de-recognize the related investment either as a result of a sale of the investment or acquisition of equity interests in the collateral.

The Company evaluates the amount expected to be collected based on current market and economic conditions, historical loss information, and reasonable and supportable forecasts. The Company's assumptions are derived from both internal data and external data which may include, among others, governmental economic projections for the New York City Metropolitan area, public data on recent transactions and filings for securitized debt instruments. This information is aggregated by asset class and adjusted for duration. Based on these inputs, loans are evaluated at the individual asset level. In certain instances, we may also use a probability-weighted model that considers the likelihood of multiple outcomes and the amount expected to be collected for each outcome.

The evaluation of the possible credit deterioration associated with the performance and/or value of the underlying collateral property as well as the financial and operating capability of the borrower/sponsor requires significant judgment, which include both asset level and market assumptions over the relevant time period.

In addition, quarterly, the Company assigns each loan a risk rating. Based on a 3-point scale, loans are rated “1” through “3,” from lower risk to higher risk, which ratings are defined as follows: 1 - Low Risk Assets - Low probability of loss, 2 - Watch List Assets - Higher potential for loss, 3 - High Risk Assets - Loss more likely than not. Loans with risk ratings of 2 or above are evaluated to determine whether the expected risk of loss is appropriately captured through the combination of our expectations of current conditions, historical loss information and supportable forecasts described above or whether risk characteristics specific to the loan warrant the use of a probability-weighted model.

Financing investments that are classified as held for sale are carried at the expected amount to be collected or fair market value using available market information obtained through consultation with dealers or other originators of such investments as well as discounted cash flow models based on Level 3 data pursuant to ASC 820-10. As circumstances change, management may conclude not to sell an investment designated as held for sale. In such situations, the investment will be reclassified at its expected amount to be collected.

Other financing receivables that are included in balance sheet line items other than the Debt and Preferred Equity Investments line are also measured at the net amount expected to be collected.

Accrued interest receivable amounts related to these debt and preferred equity investment and other financing receivables are recorded at the net amount expected to be collected within Other assets in the consolidated balance sheets. Accrued interest receivables that are written off are recognized as an expense in loan loss and other investment reserves.

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 its 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 its 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.

We have elected, and may elect in the future, to treat certain of our 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 months ended March 31, 2021, we recorded a Federal, state and local tax provision of $0.7 million. During the three months ended March 31, 2020, we recorded a Federal, state and local provision of $1.1 million.

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 initial and ongoing evaluations of the credit quality 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 potential source of funds to offset the economic costs associated with lost revenue from that tenant 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

Accounting Standards Updates

In August 2020, the FASB issued Accounting Standard Update, or "ASU," No. 2020-06 Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40). ASU 2020-06 simplifies the accounting for convertible instruments by reducing the number of accounting models for convertible debt instruments and convertible preferred stock, removes certain settlement conditions that are required for equity contracts to qualify for the derivative scope exception and also simplifies the diluted earnings per share calculation in certain areas. ASU 2020-06 is effective for reporting periods beginning after December 15, 2021, with early adoption permitted. We are currently evaluating the impact of the adoption of ASU 2020-06 on our consolidated financial statements, but do not believe the adoption of this standard will have a material impact on our consolidated financial statements.

In March 2020, the FASB issued ASU No. 2020-04 Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting and then in January 2021, the FASB issued ASU No. 2021-01. The amendments provide practical expedients for reference rate reform related activities that impact debt, leases, derivatives and other contracts. The guidance is optional and is effective between March 12, 2020 and December 31, 2022. The guidance may be elected over time as reference rate reform activities occur. During the first quarter of 2020, the Company elected to apply the hedge accounting expedients related to probability and the assessments of effectiveness for future LIBOR-indexed cash flows to assume that the index upon which future hedged transactions will be based matches the index on the corresponding derivatives. Application of these expedients preserves the presentation of derivatives consistent with past presentation. The Company continues to evaluate the impact of the guidance and may apply other elections as applicable as additional changes in the market occur.

Fair Value Measurements

Fair Value MeasurementsWe 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 evaluate real estate investments and debt and preferred equity investments, including intangibles, for potential impairment 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.

In January 2021, pursuant to the partnership documents of our 885 Third Avenue investment, certain participating rights of the common member expired. As a result, it was determined that this investment is a VIE of which we are the primary beneficiary, and the investment was consolidated in our financial statements. Upon consolidating the entity, the assets and liabilities of the entity were recorded at fair value. This fair value was determined using a third party valuation which primarily utilized 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.

Marketable securities classified as Level 1 are derived from quoted prices in active markets. The valuation technique used to measure the fair value of 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. 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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Organization and Basis of Presentation (Tables)

3 Months Ended

Mar. 31, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of commercial office properties

As of March 31, 2021, we owned the following interests in properties in the New York metropolitan area, primarily in midtown Manhattan. Our investments located outside of Manhattan are referred to as the Suburban properties:

		Consolidated		Unconsolidated		Total
Location	Property Type	Number of Buildings	Approximate Square Feet (unaudited)	Number of Buildings	Approximate Square Feet (unaudited)	Number of Buildings	Approximate Square Feet (unaudited)	Weighted Average Occupancy(1) (unaudited)
Commercial:
Manhattan	Office	18	10,526,345	9	10,869,183	27	21,395,528	93.4	%
	Retail	1	10,040	9	301,996	10	312,036	94.6	%
	Development/Redevelopment	9	1,890,614	3	2,927,782	12	4,818,396	N/A
		28	12,426,999	21	14,098,961	49	26,525,960	93.5	%
Suburban	Office	7	862,800	—	—	7	862,800	81.6	%
Total commercial properties		35	13,289,799	21	14,098,961	56	27,388,760	93.0	%
Residential:
Manhattan	Residential	1	82,250	8	1,663,774	9	1,746,024	79.1	%
Total portfolio		36	13,372,049	29	15,762,735	65	29,134,784	92.2	%

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

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Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2021

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 March 31, 2021 and December 31, 2020 (in thousands):

	March 31, 2021		December 31, 2020
Identified intangible assets (included in other assets):
Gross amount	$	239,562	$	215,673
Accumulated amortization	(204,386)		(190,523)
Net(1)	$	35,176	$	25,150
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	242,334	$	241,409
Accumulated amortization	(233,766)		(230,479)
Net(1)	$	8,568	$	10,930

(1) As of March 31, 2021 and December 31, 2020, no net intangible assets and no net intangible liabilities were reclassified to assets held for sale or liabilities related to assets held for sale.

Schedule of marketable securities

At March 31, 2021 and December 31, 2020, we held the following marketable securities (in thousands):

	March 31, 2021		December 31, 2020
Commercial mortgage-backed securities	$	23,784	$	28,570
Total marketable securities available-for-sale	$	23,784	$	28,570

Schedules of Concentration of Risk, by Risk Factor

For the three months ended March 31, 2021, the following properties contributed more than 5.0% of our annualized cash rent from office properties, including our share of annualized cash rent from joint venture office properties:

Property	Three months ended March 31, 2021
11 Madison Avenue	9.2%
420 Lexington Avenue (Graybar)	7.2%
1185 Avenue of the Americas	7.1%
1515 Broadway	6.9%
220 East 42nd Street	6.2%
280 Park Avenue	5.8%
485 Lexington Avenue	5.1%

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Property Acquisitions (Tables)

3 Months Ended

Mar. 31, 2021

Business Combinations [Abstract]

Schedule of Business Acquisitions, by Acquisition

The following table summarizes the properties acquired during the three months ended March 31, 2021:

Property	Acquisition Date	Property Type	Approximate Square Feet	Gross Asset Valuation (in millions)
885 Third Avenue (1)	January 2021	Fee Interest	625,000	$	387.9

(1)In January 2021, pursuant to the partnership documents of our 885 Third Avenue investment, certain participating rights of the common member expired. As a result, it was determined that this investment is a VIE of which we are the primary beneficiary, and the investment was consolidated in our financial statements. Upon consolidating the entity, the assets and liabilities of the entity were recorded at fair value. Prior to January 2021, the investment was accounted for under the equity method. See Note 6, "Investments in Unconsolidated Joint Ventures" and Note 16, "Fair Value Measurements."

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Properties Held for Sale and Property Dispositions (Tables)

3 Months Ended

Mar. 31, 2021

Discontinued Operations and Disposal Groups [Abstract]

Summary of Properties Sold

The following table summarizes the properties disposed of during the three months ended March 31, 2021:

Property	Disposition Date	Property Type	Approximate Square Feet	Gross Asset Valuation (in millions)		(Loss) Gain (in millions)
712 Madison Avenue (1)	January 2021	Fee Interest	6,600	$	43.0	$	(1.4)
133 Greene Street (2)	February 2021	Fee Interest	6,425	15.8		0.2
106 Spring Street (2)	March 2021	Fee Interest	5,928	35.0		(2.8)

(1)Disposition resulted from the buyer exercising its purchase option under a ground lease arrangement.

(2)In the first quarter of 2021, the property was foreclosed on by the lender in conjunction with the related debt extinguishment.

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Debt and Preferred Equity Investments (Tables)

3 Months Ended

Mar. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Schedule of debt and preferred equity book balance roll forward

Below is a summary of the activity in our debt and preferred equity investments for the three months ended March 31, 2021 and the twelve months ended December 31, 2020 (in thousands):

	March 31, 2021		December 31, 2020
Balance at beginning of year (1)	$	1,076,542	$	1,580,306
Debt investment originations/fundings/accretion (2)	17,465		389,300
Preferred equity investment originations/accretion (2)	3,195		167,042
Redemptions/sales/syndications/equity ownership/amortization (3)	—		(1,048,643)
Net change in loan loss reserves	—		(11,463)
Balance at end of period (1)	$	1,097,202	$	1,076,542

(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, but did not meet the conditions for sale accounting, are included in Other assets and Other liabilities on the consolidated balance sheets.

Schedule of Debt

Below is a summary of our debt and preferred equity investments as of March 31, 2021 (dollars in thousands):

	Floating Rate					Fixed Rate					Total Carrying Value		Senior Financing		Weighted Average Yield at End of Period	Maturity (1)
Type	Carrying Value		Face Value		Interest Rate	Carrying Value		Face Value		Interest Rate
Senior Mortgage Debt	$	64,042	$	64,649	L + 2.00% - 3.50%	$	1,249	$	1,250	3.50%	$	65,291	$	—	4.74%	2021 - 2022
Junior Mortgage Debt	7,207		12,000		L + 7.25%	42,819		43,000		6.25%	50,026		127,000		7.82%	2021
Mezzanine Debt	281,401		285,179		L + 4.95% - 13.61%	437,503		449,102		2.90% - 14.30%	718,904		4,476,210		5.86%	2021 - 2029
Preferred Equity	—		—		—	262,981		265,052		6.50% - 11.00%	262,981		1,962,750		9.94%	2022 - 2027
Balance at end of period	$	352,650	$	361,828		$	744,552	$	758,404		$	1,097,202	$	6,565,960

(1)Excludes available extension options to the extent they have not been exercised as of the date of this filing.

Allowance for Credit Losses on Financing Receivables

The following table is a rollforward of our total allowance for loan losses for the three months ended March 31, 2021 and the twelve months ended December 31, 2020 (in thousands):

	March 31, 2021		December 31, 2020
Balance at beginning of year	$	13,213	$	1,750
Cumulative adjustment upon adoption of ASC 326	—		27,803
Current period provision for loan loss	—		20,693
Write-offs charged against the allowance(1)	—		(37,033)
Balance at end of period(2)	$	13,213	$	13,213

(1)Includes $19.0 million of charges recorded against investments that were sold during the year ended December 31, 2020. These charges are included in loan loss and other investment reserves, net of recoveries, in our consolidated statements of operations for the year ended December 31, 2020.

(2)As of March 31, 2021, we had recorded an allowance for loan loss on all financing receivables on non-accrual except for one debt investment with a carrying value of $225.4 million.

Schedule of Investment in Financing Receivables and Risk Rating

The following table sets forth the carrying value of our debt and preferred equity investment portfolio by risk rating as of March 31, 2021 and December 31, 2020 (dollars in thousands):

Risk Rating	March 31, 2021		December 31, 2020
1 - Low Risk Assets - Low probability of loss	$	712,994	$	695,035
2 - Watch List Assets - Higher potential for loss	367,859		365,167
3 - High Risk Assets - Loss more likely than not	16,349		16,340
	$	1,097,202	$	1,076,542

The following table sets forth the carrying value of our debt and preferred equity investment portfolio by year of origination and risk rating as of March 31, 2021 (dollars in thousands):

	As of March 31, 2021
Risk Rating	2021(1)		2020(1)		2019(1)		Prior(1)		Total
1 - Low Risk Assets - Low probability of loss	$	—	$	361,444	$	56,639	$	294,911	$	712,994
2 - Watch List Assets - Higher potential for loss	—		—		241,285		126,574		367,859
3 - High Risk Assets - Loss more likely than not	—		—		—		16,349		16,349
	$	—	$	361,444	$	297,924	$	437,834	$	1,097,202

(1) Year in which the investment was originated or acquired by us or in which a material modification occurred.

Summary of debt investments

As of March 31, 2021 and December 31, 2020, we held the following debt investments with an aggregate weighted average current yield of 5.90% at March 31, 2021 (dollars in thousands):

Loan Type	March 31, 2021 Future Funding Obligations		March 31, 2021 Senior Financing		March 31, 2021 Carrying Value (1)		December 31, 2020 Carrying Value (1)		Maturity Date (2)
Fixed Rate Investments:
Junior Mortgage (3a)	$	—	$	67,000	$	42,820	$	32,888	July 2021
Mezzanine Loan	—		15,000		3,500		3,500		September 2021
Mortgage/Mezzanine Loan	—		63,750		56,246		56,244		October 2021
Mezzanine Loan	—		280,000		41,652		41,057		August 2022
Mezzanine Loan (4)	—		359,237		225,367		225,204		June 2023
Mezzanine Loan (3b)(5)	—		105,000		13,366		13,366		June 2024
Mezzanine Loan	—		95,000		30,000		30,000		January 2025
Mezzanine Loan	—		1,712,750		55,250		55,250		June 2027
Mezzanine Loan	—		85,000		20,000		20,000		December 2029
Total fixed rate	$	—	$	2,782,737	$	488,201	$	477,509
Floating Rate Investments:
Mezzanine Loan (6)	$	—	$	275,000	$	49,992	$	49,956	April 2021
Junior Mortgage Participation/Mezzanine Loan	—		60,000		15,742		15,733		July 2021
Mezzanine Loan	5,761		177,415		36,639		35,318		July 2021
Mezzanine Loan	—		61,744		29,130		29,106		July 2021
Mezzanine Loan (3c)	—		1,115,000		129,330		127,915		March 2022
Mortgage and Mezzanine Loan	6,769		—		60,922		60,532		May 2022
Mortgage and Mezzanine Loan	42,117		—		15,918		14,011		December 2022
Mezzanine Loan	52,288		71,314		21,560		19,889		May 2023
Total floating rate	$	106,935	$	1,760,473	$	359,233	$	352,460
Allowance for loan loss	$	—	$	—	$	(13,213)	$	(13,213)
Total	$	106,935	$	4,543,210	$	834,221	$	816,756

(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)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) $66.6 million (b) $12.0 million, and (c) $0.4 million.

(4)This loan was put on non-accrual in July 2020 and remains on non-accrual at March 31, 2021. No investment income has been recognized subsequent to it being put on non-accrual.

(5)This loan went into default and was put on non-accrual in June 2020 and remains on non-accrual at March 31, 2021. No investment income has been recognized subsequent to it being put on non-accrual. The Company is in discussions with the borrower.

(6)In April 2021, the maturity date of this loan was extended one year to April 2022.

Summary of preferred equity investments

As of March 31, 2021 and December 31, 2020, we held the following preferred equity investments with an aggregate weighted average current yield of 9.94% at March 31, 2021 (dollars in thousands):

Type	March 31, 2021 Future Funding Obligations		March 31, 2021 Senior Financing		March 31, 2021 Carrying Value (1)		December 31, 2020 Carrying Value (1)		Mandatory Redemption (2)
Preferred Equity	$	—	$	1,712,750	$	156,169	$	154,691	June 2022
Preferred Equity	—		250,000		106,812		105,095		February 2027
Total Preferred Equity	$	—	$	1,962,750	$	262,981	$	259,786
Allowance for loan loss	$	—	$	—	$	—	$	—
Total	$	—	$	1,962,750	$	262,981	$	259,786

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

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

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Investments in Unconsolidated Joint Ventures (Tables)

3 Months Ended

Mar. 31, 2021

Equity Method Investments and Joint Ventures [Abstract]

Schedule of general information on joint ventures

The table below provides general information on each of our joint ventures as of March 31, 2021:

Property	Partner	Ownership Interest (1)	Economic Interest (1)	Unaudited Approximate Square Feet
100 Park Avenue	Prudential Real Estate Investors	49.90%	49.90%	834,000
717 Fifth Avenue	Wharton Properties/Private Investor	10.92%	10.92%	119,500
800 Third Avenue	Private Investors	60.52%	60.52%	526,000
919 Third Avenue	New York State Teacher's Retirement System	51.00%	51.00%	1,454,000
11 West 34th Street	Private Investor/Wharton Properties	30.00%	30.00%	17,150
280 Park Avenue	Vornado Realty Trust	50.00%	50.00%	1,219,158
1552-1560 Broadway (2)	Wharton Properties	50.00%	50.00%	57,718
10 East 53rd Street	Canadian Pension Plan Investment Board	55.00%	55.00%	354,300
21 East 66th Street (3)	Private Investors	32.28%	32.28%	13,069
650 Fifth Avenue (4)	Wharton Properties	50.00%	50.00%	69,214
121 Greene Street	Wharton Properties	50.00%	50.00%	7,131
Stonehenge Portfolio	Various	Various	Various	1,439,016
605 West 42nd Street (5)	The Moinian Group	20.00%	20.00%	927,358
11 Madison Avenue	PGIM Real Estate	60.00%	60.00%	2,314,000
400 East 57th Street (6)	BlackRock, Inc and Stonehenge Partners	51.00%	41.00%	290,482
One Vanderbilt	National Pension Service of Korea/Hines Interest LP	71.01%	71.01%	1,657,198
Worldwide Plaza	RXR Realty / New York REIT / Private Investor	24.35%	24.35%	2,048,725
1515 Broadway	Allianz Real Estate of America	56.87%	56.87%	1,750,000
2 Herald Square	Israeli Institutional Investor	51.00%	51.00%	369,000

Property	Partner	Ownership Interest (1)	Economic Interest (1)	Unaudited Approximate Square Feet
115 Spring Street	Private Investor	51.00%	51.00%	5,218
15 Beekman (7)	A fund managed by Meritz Alternative Investment Management	20.00%	20.00%	221,884
85 Fifth Avenue	Wells Fargo	36.30%	36.30%	12,946
One Madison Avenue (8)	National Pension Service of Korea/Hines Interest LP	50.50%	50.50%	1,048,700

(1)Ownership interest and economic interest represent the Company's interests in the joint venture as of March 31, 2021. Changes in ownership or economic interests within the current year are disclosed in the notes below.

(2)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.

(3)We hold a 32.28% interest in three retail units and one residential unit at the property and a 16.14% interest in three residential units at the property.

(4)The joint venture owns a long-term leasehold interest in the retail space at 650 Fifth Avenue.

(5)In April 2021, we entered into contract to sell our interest in the property. This transaction is expected to close in the second quarter of 2021 subject to customary closing conditions.

(6)In October 2016, we sold a 49% interest in this property. Our 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. Our joint venture with Stonehenge remains consolidated resulting in the combined 51% interest being shown within investments in unconsolidated joint ventures on our balance sheet. In April 2021, we entered into contract to sell our interest in the property. In connection with this contract, we recorded a charge of $5.7 million, which is included in depreciable real estate reserves and impairment in the consolidated statements of operations. This transaction is expected to close in the third quarter of 2021 subject to customary closing conditions.

(7)In 2020, the Company formed a joint venture, which then entered into a long-term sublease with the Company.

(8)In 2020, the Company admitted partners to the One Madison Avenue development project, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and the deconsolidation of our remaining 50.5% interest. We recorded our investment at fair value, which resulted in the recognition of a fair value adjustment of $187.5 million in 2020 and a fair value adjustment of $2.7 million during the three months ended March 31, 2021. The fair value of our investment was determined by the terms of the joint venture agreement governing the capitalization of the project. The partners have committed aggregate equity to the project totaling no less than $492.2 million and their ownership interest in the joint venture is based on their capital contributions, up to an aggregate maximum of 49.5%. At March 31, 2021, the total of the two partners' ownership interests based on equity contributed was 9.0%.

Schedule of Investments in Unconsolidated Joint Ventures Disposed

The following table summarizes the investments in unconsolidated joint ventures disposed of during the three months ended March 31, 2021:

Property	Ownership Interest Disposed	Disposition Date	Gross Asset Valuation (in thousands)		Gain (Loss) on Sale (in thousands) (1)
885 Third Avenue (2)	N/A	January 2021	N/A		N/A
55 West 46th Street - Tower 46	25.0%	March 2021	$	275.0	$	(15.2)

(1)Represents the Company's share of the gain or loss.

(2)In January 2021, pursuant to the partnership documents of our 885 Third Avenue investment, certain participating rights of the common member expired. As a result, it was determined that we are the primary beneficiary of the VIE and the investment was consolidated in our financial statements. See Note 3, "Property Acquisitions."

Schedule of first mortgage notes payable collateralized by the respective joint venture properties and assignment of leases

The mortgage notes and other loans payable collateralized by the respective joint venture properties and assignment of leases at March 31, 2021 and December 31, 2020, respectively, are as follows (dollars in thousands):

Property	Economic Interest (1)		Initial Maturity Date	Final Maturity Date (2)	Interest Rate (3)			March 31, 2021		December 31, 2020
Fixed Rate Debt:
717 Fifth Avenue (mortgage)	10.92	%	July 2022	July 2022		4.45	%	$	300,000	$	300,000
717 Fifth Avenue (mezzanine)	10.92	%	July 2022	July 2022		5.50	%	355,328		355,328
650 Fifth Avenue (mortgage)	50.00	%	October 2022	October 2022		4.46	%	210,000		210,000
650 Fifth Avenue (mezzanine)	50.00	%	October 2022	October 2022		5.45	%	65,000		65,000
21 East 66th Street	32.28	%	April 2023	April 2028		3.60	%	12,000		12,000

Property	Economic Interest (1)		Initial Maturity Date	Final Maturity Date (2)	Interest Rate (3)			March 31, 2021		December 31, 2020
919 Third Avenue	51.00	%	June 2023	June 2023		5.12	%	500,000		500,000
1515 Broadway	56.87	%	March 2025	March 2025		3.93	%	815,876		820,607
11 Madison Avenue	60.00	%	September 2025	September 2025		3.84	%	1,400,000		1,400,000
800 Third Avenue	60.52	%	February 2026	February 2026		3.37	%	177,000		177,000
400 East 57th Street (4)	41.00	%	November 2026	November 2026		3.00	%	97,024		97,024
Worldwide Plaza	24.35	%	November 2027	November 2027		3.98	%	1,200,000		1,200,000
Stonehenge Portfolio (5)	Various		Various	Various		3.50	%	195,899		195,899
885 Third Avenue (6)								—		272,000
Total fixed rate debt								$	5,328,127	$	5,604,858
Floating Rate Debt:
280 Park Avenue	50.00	%	September 2021	September 2024	L+	1.73	%	$	1,200,000	$	1,200,000
One Vanderbilt (7)	71.01	%	September 2021	September 2023	L+	2.50	%	1,283,292		1,210,329
1552 Broadway	50.00	%	October 2021	October 2022	L+	2.65	%	195,000		195,000
2 Herald Square	51.00	%	November 2021	November 2023	L+	1.45	%	214,500		214,500
11 West 34th Street	30.00	%	January 2022	January 2023	L+	1.45	%	23,000		23,000
121 Greene Street (8)	50.00	%	November 2022	November 2022	L+	2.00	%	13,771		15,000
115 Spring Street	51.00	%	September 2023	September 2023	L+	3.40	%	65,550		65,550
100 Park Avenue	49.90	%	December 2023	December 2025	L+	2.25	%	360,000		360,000
15 Beekman (9)	20.00	%	January 2024	July 2025	L+	1.50	%	19,165		11,212
10 East 53rd Street	55.00	%	February 2025	February 2025	L+	1.35	%	220,000		220,000
One Madison Avenue (10)	50.50	%	November 2025	November 2026	L+	3.35	%	40,104		—
605 West 42nd Street (11)	20.00	%	August 2027	August 2027	L+	1.44	%	550,000		550,000
21 East 66th Street	32.28	%	June 2033	June 2033	T+	2.75	%	666		677
55 West 46th Street								—		192,524
Total floating rate debt								$	4,185,048	$	4,257,792
Total joint venture mortgages and other loans payable								$	9,513,175	$	9,862,650
Deferred financing costs, net								(98,252)		(113,446)
Total joint venture mortgages and other loans payable, net								$	9,414,923	$	9,749,204

(1)Economic interest represents the Company's interests in the joint venture as of March 31, 2021. Changes in ownership or economic interests, if any, within the current year are disclosed in the notes to the investment in unconsolidated joint ventures table above.

(2)Reflects exercise of all available options. The ability to exercise extension options may be subject to certain tests based on the operating performance of the property.

(3)Interest rates as of March 31, 2021, taking into account interest rate hedges in effect during the period. Floating rate debt is presented with the stated spread over the 30-day LIBOR ("L") or 1-year Treasury ("T").

(4)In April 2021, we entered into a contract to sell our interest in the property. This transaction is expected to close in the third quarter of 2021 subject to customary closing conditions.

(5)Comprised of three mortgages totaling $132.4 million that mature in April 2028 and two mortgages totaling $63.5 million that mature in July 2029.

(6)This loan was repaid in the first quarter of 2021, and as of March 31, 2021, the property is consolidated in our financial statements. See Note 3, "Property Acquisitions."

(7)This loan is a $1.75 billion construction facility with reductions in interest cost based on meeting certain conditions, the first of which has been satisfied, and has an initial term of three years with two one year extension options. Advances under the loan are subject to costs incurred. In conjunction with the loan, we provided partial guarantees for interest and principal payments, the amounts of which are based on certain construction milestones and operating metrics.

(8)In March 2021, the maturity date of this loan was extended by one year.

(9)This loan is a $125.0 million construction facility. Advances under the loan are subject to costs incurred.

(10)The loan is a $1.25 billion construction facility with an initial term of five years with one one year extension option. Advances under the loan are subject to costs incurred. In conjunction with the loan, we provided partial guarantees for interest and principal payments, the amounts of which are based on certain construction milestones and operating metrics.

(11)In April 2021, we entered into contract to sell our interest in the property. This transaction is expected to close in the second quarter of 2021 subject to customary closing conditions.

Schedule of combined balance sheets for the unconsolidated joint ventures

The combined balance sheets for the unconsolidated joint ventures, at March 31, 2021 and December 31, 2020 are as follows (in thousands):

	March 31, 2021		December 31, 2020
Assets (1)
Commercial real estate property, net	$	15,243,331	$	16,143,880
Cash and restricted cash	317,753		357,076
Tenant and other receivables, related party receivables, and deferred rents receivable	412,203		403,883
Other assets	1,950,444		2,001,612
Total assets	$	17,923,731	$	18,906,451
Liabilities and equity (1)
Mortgages and other loans payable, net	$	9,414,923	$	9,749,204
Deferred revenue	1,311,191		1,341,571
Lease liabilities	985,622		1,002,563
Other liabilities	373,400		464,107
Equity	5,838,595		6,349,006
Total liabilities and equity	$	17,923,731	$	18,906,451
Company's investments in unconsolidated joint ventures	$	3,698,701	$	3,823,322

(1)At March 31, 2021, $174.2 million of net unamortized basis differences between the amount at which our investments are carried and our share of equity in net assets of the underlying property will be amortized through equity in net income (loss) from unconsolidated joint ventures over the remaining life of the underlying items having given rise to the differences.

Schedule of combined statements of income for the unconsolidated joint ventures

The combined statements of operations for the unconsolidated joint ventures, from acquisition date through the three months ended March 31, 2021 and 2020, are as follows (in thousands):

	Three Months Ended March 31,
	2021		2020
Total revenues	$	301,541	$	282,520
Operating expenses	46,233		51,590
Real estate taxes	54,592		53,372
Operating lease rent	5,644		6,361
Interest expense, net of interest income	78,749		86,324
Amortization of deferred financing costs	6,384		4,814
Depreciation and amortization	114,879		98,584
Total expenses	306,481		301,045
Net loss before gain on sale	$	(4,940)	$	(18,525)
Company's equity in net loss from unconsolidated joint ventures	$	(2,864)	$	(12,814)

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Deferred Costs (Tables)

3 Months Ended

Mar. 31, 2021

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

Schedule of components of deferred costs

Deferred costs at March 31, 2021 and December 31, 2020 consisted of the following (in thousands):

	March 31, 2021		December 31, 2020
Deferred leasing costs	$	448,197	$	447,002
Less: accumulated amortization	(277,945)		(269,834)
Deferred costs, net	$	170,252	$	177,168

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Mortgages and Other Loans Payable (Tables)

3 Months Ended

Mar. 31, 2021

Mortgages and Other Loans Payable

Schedule of first mortgages and other loans payable collateralized by the respective properties and assignment of leases

The mortgages and other loans payable collateralized by the respective properties and assignment of leases or debt investments at March 31, 2021 and December 31, 2020, respectively, were as follows (dollars in thousands):

Property	Initial Maturity Date	Final Maturity Date (1)	Interest Rate (2)		March 31, 2021		December 31, 2020
Fixed Rate Debt:
100 Church Street	July 2022	July 2022		4.68%	$	203,697	$	204,875
420 Lexington Avenue	October 2024	October 2040		3.99%	292,672		294,035
Landmark Square	January 2027	January 2027		4.90%	100,000		100,000
485 Lexington Avenue	February 2027	February 2027		4.25%	450,000		450,000
1080 Amsterdam (3)	February 2027	February 2027		3.59%	34,773		34,773
Total fixed rate debt					$	1,081,142	$	1,083,683
Floating Rate Debt:
185 Broadway (4)	November 2021	November 2023	L+	2.85%	$	168,870	$	158,478
609 Fifth Avenue	March 2022	March 2022	L+	2.95%	57,651		57,651
220 East 42nd Street	June 2023	June 2025	L+	2.75%	510,000		510,000
719 Seventh Avenue	September 2023	September 2023	L+	1.20%	50,000		50,000
133 Greene Street					—		15,523
106 Spring Street					—		38,025
FHLB Facility					—		10,000
FHLB Facility					—		15,000
FHLB Facility					—		35,000
712 Madison Avenue					—		28,000
2017 Master Repurchase Agreement (5)					—		—
Total floating rate debt					$	786,521	$	917,677
Total mortgages and other loans payable					$	1,867,663	$	2,001,360
Deferred financing costs, net of amortization					(18,962)		(21,388)
Total mortgages and other loans payable, net					$	1,848,701	$	1,979,972

(1)Reflects exercise of all available options. The ability to exercise extension options may be subject to certain tests based on the operating performance of the property.

(2)Interest rate as of March 31, 2021, taking into account interest rate hedges in effect during the period. Floating rate debt is presented with the stated spread over the 30-day LIBOR, unless otherwise specified.

(3)The loan is comprised of a $33.9 million mortgage loan and $0.9 million mezzanine loan with a fixed interest rate of 350 basis points and 700 basis points, respectively, for the first five years and is prepayable without penalty at the end of fifth year.

(4)This loan is a $225.0 million construction facility, with reductions in interest cost based on meeting certain conditions, and has an initial three year term with two one year extension options. Advances under the loan are subject to incurred costs and funded equity requirements.

(5)In June 2020, we exercised a one year extension option which extended the maturity date to June 2021. At March 31, 2021, there was no outstanding balance on the $400 million facility.

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Corporate Indebtedness (Tables)

3 Months Ended

Mar. 31, 2021

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 March 31, 2021 and December 31, 2020, respectively, by scheduled maturity date (dollars in thousands):

Issuance	March 31, 2021 Unpaid Principal Balance		March 31, 2021 Accreted Balance		December 31, 2020 Accreted Balance		Interest Rate (1)			Initial Term (in Years)	Maturity Date
August 7, 2018 (2) (3)	$	350,000	$	350,000	$	350,000		1.52	%	3	August 2021
October 5, 2017 (2)	500,000		499,830		499,803			3.25	%	5	October 2022
November 15, 2012 (4)	300,000		301,817		302,086			4.50	%	10	December 2022
December 17, 2015 (5)	100,000		100,000		100,000			4.27	%	10	December 2025
	$	1,250,000	$	1,251,647	$	1,251,889
Deferred financing costs, net			(3,025)		(3,670)
	$	1,250,000	$	1,248,622	$	1,248,219

(1)Interest rate as of March 31, 2021, taking into account interest rate hedges in effect during the period.

(2)Issued by the Operating Partnership with the Company as the guarantor.

(3)The notes are subject to redemption at the Company's option, in whole but not in part, at a redemption price equal to 100% of the principal amount of the notes, plus unpaid accrued interest thereon to the redemption date. In April 2020, the Company entered into $350.0 million of fixed rate interest swaps at a rate of 0.54375% through August 2021.

(4)In October 2017, the Company and the Operating Partnership as co-obligors issued an additional $100.0 million of 4.50% senior unsecured notes due December 2022. The notes were priced at 105.334% of par.

(5)Issued by the Company and the Operating Partnership as co-obligors.

Schedule of combined aggregate principal maturities

Combined aggregate principal maturities of mortgages and other loans payable, the 2017 credit facility, trust preferred securities, senior unsecured notes and our share of joint venture debt as of March 31, 2021, including as-of-right extension options, were as follows (in thousands):

	Scheduled Amortization		Mortgages and Other Loans Payable		Revolving Credit Facility		Unsecured Term Loans		Trust Preferred Securities		Senior Unsecured Notes		Total		Joint Venture Debt
Remaining 2021	$	8,031	$	168,870	$	—	$	—	$	—	$	350,000	$	526,901	$	1,126,896
2022	8,765		255,435		—		—		—		800,000		1,064,200		227,701
2023	6,594		560,000		630,000		1,300,000		—		—		2,496,594		491,066
2024	5,280		272,749		—		200,000		—		—		478,029		620,843
2025	823		—		—		—		—		100,000		100,823		1,403,266
Thereafter	924		580,192		—		—		100,000		—		681,116		552,813
	$	30,417	$	1,837,246	$	630,000	$	1,500,000	$	100,000	$	1,250,000	$	5,347,663	$	4,422,585

Schedule of consolidated interest expense, excluding capitalized interest

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

	Three Months Ended March 31,
	2021		2020
Interest expense before capitalized interest	$	39,868	$	56,813
Interest on financing leases	1,492		1,663
Interest capitalized	(17,583)		(20,483)
Interest income	(389)		(499)
Interest expense, net	$	23,388	$	37,494

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Related Party Transactions (Tables)

3 Months Ended

Mar. 31, 2021

Related Party Transactions [Abstract]

Schedule of amounts due from/to related parties

Amounts due from joint ventures and related parties at March 31, 2021 and December 31, 2020 consisted of the following (in thousands):

	March 31, 2021		December 31, 2020
Due from joint ventures	$	26,500	$	27,006
Other	7,810		7,651
Related party receivables	$	34,310	$	34,657

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Noncontrolling Interests on the Company's Consolidated Financial Statements (Tables)

3 Months Ended

Mar. 31, 2021

Noncontrolling Interest [Abstract]

Schedule of Noncontrolling Interest

Below is a summary of the activity relating to the noncontrolling interests in the Operating Partnership for the three months ended March 31, 2021 and the twelve months ended December 31, 2020 (in thousands):

	March 31, 2021		December 31, 2020
Balance at beginning of period	$	358,262	$	409,862
Distributions	(4,148)		(12,652)
Issuance of common units	4,483		12,018
Redemption and conversion of common units	(13,261)		(36,085)
Net (loss) income	(476)		20,016
Accumulated other comprehensive income (loss) allocation	2,655		(2,299)
Fair value adjustment	26,609		(32,598)
Balance at end of period	$	374,124	$	358,262

Schedule of Preferred Unit Activity

Below is a summary of the preferred units of limited partnership interest in the Operating Partnership as of March 31, 2021:

Issuance	Stated Distribution Rate		Number of Units Authorized	Number of Units Issued	Number of Units Outstanding	Annual Dividend Per Unit(1)		Liquidation Preference Per Unit(2)		Conversion Price Per Unit(3)		Date of Issuance
Series A (4)	3.50	%	109,161	109,161	109,161	$	35.0000	$	1,000.00	$	—	August 2015
Series F	7.00%		60	60	60	$	70.0000	$	1,000.00	$	29.12	January 2007
Series G (5)	4.50%		1,902,000	1,902,000	718,697	$	1.1250	$	25.00	$	88.50	January 2012
Series K	3.50%		700,000	563,954	341,677	$	0.8750	$	25.00	$	134.67	August 2014
Series L	4.00%		500,000	378,634	372,634	$	1.0000	$	25.00	$	—	August 2014
Series M	3.75%		1,600,000	1,600,000	96,357	$	0.9375	$	25.00	$	—	February 2015
Series P	4.00%		200,000	200,000	200,000	$	1.0000	$	25.00	$	—	July 2015
Series Q	3.50%		268,000	268,000	268,000	$	0.8750	$	25.00	$	148.95	July 2015
Series R	3.50%		400,000	400,000	400,000	$	0.8750	$	25.00	$	154.89	August 2015
Series S	4.00%		1,077,280	1,077,280	1,077,280	$	1.0000	$	25.00	$	—	August 2015
Series V	3.50%		40,000	40,000	40,000	$	0.8750	$	25.00	$	—	May 2019
Series W (6)	(6)		1	1	1	(6)		(6)		(6)		January 2020

(1)Dividends are cumulative, subject to certain provisions.

(2)Units are redeemable at any time at par for cash at the option of the unitholder unless otherwise specified.

(3)If applicable, 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) the amount shown in the table.

(4)Issued through a consolidated subsidiary. The units 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 March 31, 2021, no Subsidiary Series B Preferred Units have been issued.

(5)Common units of limited partnership interest in the Operating Partnership issued in a conversion may be redeemed in exchange for our 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.

(6)The Series W preferred unit was issued in January 2020 in exchange for the then-outstanding Series O preferred unit. The holder of the Series W preferred unit is entitled to quarterly dividends in an amount calculated as (i) 1,350 multiplied by (ii) the current distribution per common unit of limited partnership in SL Green Operating Partnership. The holder has the right to require the Operating Partnership to repurchase the Series W unit for cash, or convert the Series W unit for Class B units, in each case at a price that is determined based on the closing price of the Company's common stock at the time such right is exercised. The unit's liquidation preference is the fair market value of the unit plus accrued distributions at the time of a liquidation event.

Below is a summary of the activity relating to the preferred units in the Operating Partnership for the three months ended March 31, 2021 and the twelve months ended December 31, 2020 (in thousands):

	March 31, 2021		December 31, 2020
Balance at beginning of period	$	202,169	$	283,285
Issuance of preferred units	—		—
Redemption of preferred units	(3,631)		(82,750)
Dividends paid on preferred units	(1,731)		(6,163)
Accrued dividends on preferred units	1,696		7,797
Balance at end of period	$	198,503	$	202,169

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Stockholders' Equity of the Company (Tables)

3 Months Ended

Mar. 31, 2021

Stockholders' Equity Note [Abstract]

Class of Treasury Stock

At March 31, 2021, share repurchases, excluding the redemption of OP units, executed under the program were as follows:

Period	Shares repurchased	Average price paid per share	Cumulative number of shares repurchased as part of the repurchase plan or programs
Year ended 2017	8,105,881	$104.61	8,105,881
Year ended 2018	9,468,617	$99.03	17,574,498

Year ended 2019	4,465,857	$86.06	22,040,355
Year Ended 2020	8,529,279	$62.39	30,569,634
Three months ended March 31, 2021	1,306,460	$61.46	31,876,094

Schedule of Common Stock Issued and Proceeds Received Dividend Reinvestments

The following table summarizes SL Green common stock issued, and proceeds received from dividend reinvestments and/or stock purchases under the DRSPP for the three months ended March 31, 2021 and 2020, respectively (dollars in thousands):

	Three Months Ended March 31,
	2021		2020
Shares of common stock issued	5,483		1,727
Dividend reinvestments/stock purchases under the DRSPP	$	351	$	166

Schedule of Earnings Per Share

SL Green's earnings per share for the three months ended March 31, 2021 and 2020 are computed as follows (in thousands):

	Three Months Ended March 31,
Numerator	2021		2020
Basic Earnings:
Net (loss) income attributable to SL Green common stockholders	$	(7,464)	$	114,801
Less: distributed earnings allocated to participating securities	(371)		(113)
Less: undistributed earnings allocated to participating securities	—		(464)
Net (loss) income attributable to SL Green common stockholders (numerator for basic earnings per share)	$	(7,835)	$	114,224
Add back: dilutive effect of earnings allocated to participating securities	371		113
Add back: undistributed earnings allocated to participating securities	—		464
Add back: effect of dilutive securities (redemption of units to common shares)	(476)		6,202
Net (loss) income attributable to SL Green common stockholders (numerator for diluted earnings per share)	$	(7,940)	$	121,003

	Three Months Ended March 31,
Denominator	2021	2020
Basic Shares:
Weighted average common stock outstanding	69,010	75,656
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares	4,148	4,220
Stock-based compensation plans	595	476
Contingently issuable shares from special dividend declared December 4, 2020 and issued January 15, 2021	317	—
Diluted weighted average common stock outstanding	74,070	80,352

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Partners' Capital of the Operating Partnership (Tables)

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

Schedule of calculation of numerator and denominator in earnings per unit

The Operating Partnership's earnings per unit for the three months ended March 31, 2021 and 2020, respectively, are computed as follows (in thousands):

	Three Months Ended March 31,
Numerator	2021		2020
Basic Earnings:
Net (loss) income attributable to SLGOP common unitholders	$	(7,940)	$	121,003
Less: distributed earnings allocated to participating securities	(371)		(113)
Less: undistributed earnings allocated to participating securities	—		(464)
Net (loss) income attributable to SLGOP common unitholders (numerator for basic earnings per unit)	$	(8,311)	$	120,426
Add back: dilutive effect of earnings allocated to participating securities	371		113
Add back: undistributed earnings allocated to participating securities	—		464
Net (loss) income attributable to SLGOP common unitholders (numerator for diluted earnings per unit)	$	(7,940)	$	121,003

	Three Months Ended March 31,
Denominator	2021	2020
Basic units:
Weighted average common units outstanding	73,158	79,876
Effect of Dilutive Securities:
Stock-based compensation plans	595	476
Contingently issuable units from special distribution declared December 4, 2020 and issued January 15, 2021	317	—
Diluted weighted average common units outstanding	74,070	80,352

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Share-based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Abstract]

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 March 31, 2021 and December 31, 2020, and changes during the three months ended March 31, 2021 and year ended December 31, 2020 are as follows:

	March 31, 2021			December 31, 2020
	Options Outstanding	Weighted Average Exercise Price		Options Outstanding	Weighted Average Exercise Price
Balance at beginning of period	784,995	$	102.62	1,007,665	$	105.35
Granted	—	—		—	—
Exercised	—	—		—	—
Lapsed or canceled	(9,716)	86.13		(222,670)	114.97
Balance at end of period	775,279	$	102.83	784,995	$	102.62
Options exercisable at end of period	775,278	$	102.83	782,022	$	102.62

Summary of restricted stock and charges during the period

A summary of the Company's restricted stock as of March 31, 2021 and December 31, 2020 and changes during the three months ended March 31, 2021 and the year ended December 31, 2020, are as follows:

	March 31, 2021		December 31, 2020
Balance at beginning of period	3,439,674		3,465,347
Granted	145,845		8,959
Canceled	(12,437)		(34,632)
Balance at end of period	3,573,082		3,439,674
Vested during the period	117,487		128,891
Compensation expense recorded	$	2,067,125	$	10,895,459
Total fair value of restricted stock granted during the period	$	9,214,531	$	734,315

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Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

Schedule of accumulated other comprehensive income (loss)

The following tables set forth the changes in accumulated other comprehensive loss by component as of March 31, 2021 (in thousands):

	Net unrealized loss on derivative instruments (1)		SL Green’s share of joint venture net unrealized loss on derivative instruments (2)		Net unrealized gain (loss) on marketable securities		Total
Balance at December 31, 2020	$	(57,415)	$	(10,853)	$	1,021	$	(67,247)
Other comprehensive income before reclassifications	9,771		33,024		(247)		42,548
Amounts reclassified from accumulated other comprehensive loss	4,196		1,606		—		5,802
Balance at March 31, 2021	$	(43,448)	$	23,777	$	774	$	(18,897)

(1)Amount reclassified from accumulated other comprehensive loss is included in interest expense in the respective consolidated statements of operations. As of March 31, 2021 and December 31, 2020, the deferred net gains from these terminated hedges, which is included in accumulated other comprehensive loss relating to net unrealized loss on derivative instrument, was $(0.6) million and $(0.5) million, respectively.

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

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2021

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 March 31, 2021 and December 31, 2020 (in thousands):

	March 31, 2021
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities	$	23,784	$	—	$	23,784	$	—
Interest rate cap and swap agreements (included in Other assets)	$	365	$	—	$	365	$	—
Liabilities:
Interest rate cap and swap agreements (included in Other liabilities)	$	47,033	$	—	$	47,033	$	—

	December 31, 2020
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities	$	28,570	$	—	$	28,570	$	—
Interest rate cap and swap agreements (included in Other assets)	$	28	$	—	$	28	$	—
Liabilities:
Interest rate cap and swap agreements (included in Other liabilities)	$	61,217	$	—	$	61,217	$	—

Fair value, by balance sheet grouping

The following table provides the carrying value and fair value of these financial instruments as of March 31, 2021 and December 31, 2020 (in thousands):

	March 31, 2021				December 31, 2020
	Carrying Value (1)		Fair Value		Carrying Value (1)		Fair Value
Debt and preferred equity investments	$	1,097,202	(2)		$	1,076,542	(2)
Fixed rate debt	$	3,932,789	$	4,027,789	$	3,135,572	$	3,237,075
Variable rate debt	1,416,521		1,420,814		1,827,677		1,822,740
	$	5,349,310	$	5,448,603	$	4,963,249	$	5,059,815

(1)Amounts exclude net deferred financing costs.

(2)At March 31, 2021, debt and preferred equity investments had an estimated fair value ranging between $1.0 billion and $1.1 billion. At December 31, 2020, debt and preferred equity investments had an estimated fair value ranging between $1.0 billion and $1.1 billion.

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Financial Instruments: Derivatives and Hedging (Tables)

3 Months Ended

Mar. 31, 2021

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 March 31, 2021 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 (dollars in thousands).

	Notional Value		Strike Rate		Effective Date	Expiration Date	Balance Sheet Location	Fair Value
Interest Rate Swap	$	350,000	0.544	%	April 2020	August 2021	Other Liabilities	$	(472)
Interest Rate Cap	111,869		3.500	%	December 2020	November 2021	Other Assets	—
Interest Rate Cap	510,000		3.000	%	June 2020	December 2021	Other Assets	—
Interest Rate Swap	200,000		0.138	%	February 2021	February 2022	Other Liabilities	(3)
Interest Rate Swap	100,000		0.136	%	February 2021	February 2022	Other Assets	—
Interest Rate Cap	85,000		4.000	%	March 2021	March 2022	Other Assets	—
Interest Rate Swap	100,000		0.212	%	January 2021	January 2023	Other Assets	95
Interest Rate Swap	400,000		0.160	%	February 2021	February 2023	Other Assets	270
Interest Rate Swap	200,000		1.131	%	July 2016	July 2023	Other Liabilities	(4,017)
Interest Rate Swap	100,000		1.161	%	July 2016	July 2023	Other Liabilities	(2,077)
Interest Rate Swap	150,000		2.696	%	January 2019	January 2024	Other Liabilities	(9,675)
Interest Rate Swap	150,000		2.721	%	January 2019	January 2026	Other Liabilities	(13,117)
Interest Rate Swap	200,000		2.740	%	January 2019	January 2026	Other Liabilities	(17,672)
								$	(46,668)

The following table summarizes the notional value at inception and fair value of our joint ventures' derivative financial instruments at March 31, 2021 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 (dollars in thousands).

	Notional Value		Strike Rate		Effective Date	Expiration Date	Classification	Fair Value
Interest Rate Swap	$	177,000	1.669	%	March 2016	February 2026	Liability	$	(6,459)
Interest Rate Cap	375,000		2.600	%	August 2018	September 2021	Asset	—
Interest Rate Cap	20,026		2.600	%	April 2019	September 2021	Asset	—
Interest Rate Cap	198,000		4.000	%	August 2019	August 2022	Asset	2
Interest Rate Cap	220,000		4.000	%	February 2020	February 2022	Asset	—
Interest Rate Cap	550,000		3.750	%	August 2020	September 2023	Asset	138
Interest Rate Cap	1,075,000		3.750	%	September 2020	September 2021	Asset	—
Interest Rate Cap	125,000		3.750	%	September 2020	September 2021	Asset	—
Interest Rate Cap	1,250,000		1.250	%	November 2020	October 2024	Asset	5,764
Interest Rate Cap	23,000		4.750	%	January 2021	January 2023	Asset	1
Interest Rate Swap	2,250,000		1.611	%	June 2021	June 2031	Asset	42,635
								$	42,081

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 March 31, 2021 and 2020, respectively (in thousands):

	Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)				Location of Loss Reclassified from Accumulated Other Comprehensive Loss into Income	Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income
	Three Months Ended March 31,					Three Months Ended March 31,
Derivative	2021		2020			2021		2020
Interest Rate Swaps/Caps	$	10,220	$	(45,082)	Interest expense	$	(4,388)	$	(725)
Share of unconsolidated joint ventures' derivative instruments	34,955		(7,089)		Equity in net loss from unconsolidated joint ventures	(1,700)		(711)
	$	45,175	$	(52,171)		$	(6,088)	$	(1,436)

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Lease Income (Tables)

3 Months Ended

Mar. 31, 2021

Leases [Abstract]

Operating Lease, Lease Income

The components of lease income from operating leases during the quarters ended March 31, 2021 and 2020 were as follows (in thousands):

	Three Months Ended March 31,
	2021		2020
Fixed lease payments	$	164,679	$	194,224
Variable lease payments	25,279		27,168
Total lease payments (1)	$	189,958	$	221,392
Amortization of acquired above and below-market leases	(1,869)		1,239
Total rental revenue	$	188,089	$	222,631

(1)Amounts include $65.8 million and $66.3 million of sublease income during the three months ended March 31, 2021 and 2020, respectively.

Sales-type Lease, Lease Income

The components of lease income from sales-type leases during the quarters ended March 31, 2021 and 2020 were as follows (in thousands):

	Three Months Ended March 31,
	2021		2020
Interest income (1)	$	1,101	$	—

(1)These amounts are included in Other income in our consolidated statements of operations.

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Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

Schedule of ground lease arrangements

The table below summarizes our current lease arrangements as of March 31, 2021:

Property (1)	Year of Current Expiration	Year of Final Expiration (2)
1185 Avenue of the Americas	2043	2043
SL Green Headquarters at One Vanderbilt (3)	2043	2048
625 Madison Avenue	2022	2054
420 Lexington Avenue	2050	2080
885 Third Avenue	2080	2080
711 Third Avenue (4)	2033	2083
461 Fifth Avenue (5)	2027	2084
1080 Amsterdam Avenue (6)	2111	2111
15 Beekman (7)(8)	2119	2119

(1)All leases are classified as operating leases unless otherwise specified.

(2)Reflects exercise of all available extension options.

(3)In March 2021, the Company's lease for its corporate headquarters at One Vanderbilt commenced. See note 10, "Related Party Transactions."

(4)The Company owns 50% of the fee interest.

(5)In April 2021, the Company exercised its option to acquire the fee interest in the property. The transaction is expected to close in the second quarter of 2021. The lease is classified as a financing lease.

(6)A portion of the lease is classified as a financing lease.

(7)The Company has an option to purchase the ground lease for a fixed price on a specific date. The lease is classified as a financing lease.

(8)In August 2020, the Company entered into a long-term sublease with an unconsolidated joint venture as part of the capitalization of the 15 Beekman development project. See Note 6, "Investments in Unconsolidated Joint Ventures."

Finance lease, liability, maturity

The following is a schedule of future minimum lease payments as evaluated in accordance with ASC 842 for our financing leases and operating leases with initial terms in excess of one year as of March 31, 2021 (in thousands):

	Financing leases		Operating leases
Remaining 2021	$	31,136	$	31,954
2022	3,522		29,386
2023	3,570		29,502
2024	3,641		30,545
2025	3,810		30,772
2026	3,858		30,911
Thereafter	256,692		631,532
Total minimum lease payments	$	306,229	$	814,602
Amount representing interest	(153,607)
Amount discounted using incremental borrowing rate			(359,217)
Lease liabilities	$	152,622	$	455,385

Schedule of future minimum rental payments for operating leases

The following is a schedule of future minimum lease payments as evaluated in accordance with ASC 842 for our financing leases and operating leases with initial terms in excess of one year as of March 31, 2021 (in thousands):

	Financing leases		Operating leases
Remaining 2021	$	31,136	$	31,954
2022	3,522		29,386
2023	3,570		29,502
2024	3,641		30,545
2025	3,810		30,772
2026	3,858		30,911
Thereafter	256,692		631,532
Total minimum lease payments	$	306,229	$	814,602
Amount representing interest	(153,607)
Amount discounted using incremental borrowing rate			(359,217)
Lease liabilities	$	152,622	$	455,385

Lease, cost

The following table provides lease cost information for the Company's operating leases for the three months ended March 31, 2021 or 2020 (in thousands):

	Three Months Ended March 31,
Operating Lease Costs	2021		2020
Operating lease costs before capitalized operating lease costs	$	7,567	$	8,113
Operating lease costs capitalized	(828)		(746)
Operating lease costs, net (1)	$	6,739	$	7,367

(1)This amount is included in operating lease rent in our consolidated statements of operations.

The following table provides lease cost information for the Company's financing leases for the three months ended March 31, 2021 or 2020 (in thousands):

	Three Months Ended March 31,
Financing Lease Costs	2021		2020
Interest on financing leases before capitalized interest	$	1,492	$	1,663
Interest on financing leases capitalized	—		(747)
Interest on financing leases, net (1)	1,492		916
Amortization of right-of-use assets (2)	180		305
Financing lease costs, net	$	1,672	$	1,221

(1)These amounts are included in interest expense, net of interest income in our consolidated statements of operations.

(2)These amounts are included in depreciation and amortization in our consolidated statements of operations.

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Segment Information (Tables)

3 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Schedule of selected results of operations and selected asset information

Selected consolidated results of operations for the three months ended March 31, 2021 and 2020, and selected asset information as of March 31, 2021 and December 31, 2020, regarding our operating segments are as follows (in thousands):

	Real Estate Segment		Debt and Preferred Equity Segment		Total Company
Total revenues
Three months ended:
March 31, 2021	$	206,829	$	19,273	$	226,102
March 31, 2020	275,770		38,533		314,303
Net (loss) income
Three months ended:
March 31, 2021	$	(20,027)	$	16,172	$	(3,855)
March 31, 2020	111,233		15,881		127,114
Total assets
As of:
March 31, 2021	$	10,896,203	$	1,147,842	$	12,044,045
December 31, 2020	10,579,899		1,127,668		11,707,567

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Organization and Basis of Presentation - Additional Information (Details)			3 Months Ended
	Jan. 15, 2021 $ / shares	Jan. 08, 2021	Mar. 31, 2021	Jan. 07, 2021 $ / shares	Dec. 31, 2020
Common Stock
Organization
Share price (in dollars per share)				$ 58.15
Reverse stock split conversion ratio		1.02918
Common Stock | Cash Dividend
Organization
Common stock, dividends, per share, cash paid (in dollars per share)	$ 0.3735
Common stock, dividends, per share, stock paid (in dollars per share)	0.0279
Common Stock | Stock Dividend
Organization
Common stock, dividends, per share, stock paid (in dollars per share)	$ 0.0343
Service Corporation
Organization
Percentage of ownership in SL Green Management LLC owned by operating partnership (percent)			95.00%
Operating Partnership | SL Green Operating Partnership
Organization
Noncontrolling interest in the operating partnership (as a percent)			5.65%		5.44%
SL Green Management | SL Green Management LLC
Organization
Percentage of ownership in SL Green Management LLC owned by operating partnership (percent)			100.00%

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Organization and Basis of Presentation - Schedule of Commercial Office Properties (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) ft² building shares
Real estate properties
Number of Buildings | building	65
Approximate Square Feet unaudited (sqft) | ft²	29,134,784
Weighted Average Occupancy unaudited (as a percent)	92.20%
Debt and preferred equity investments including investments held by unconsolidated joint ventures | $	$ 1,100
Debt and preferred equity investments and other financing receivables included in other balance sheet items | $	$ 100
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 Buildings | building	56
Approximate Square Feet unaudited (sqft) | ft²	27,388,760
Weighted Average Occupancy unaudited (as a percent)	93.00%
Managed office properties
Real estate properties
Number of Buildings | building	2
Approximate Square Feet unaudited (sqft) | ft²	2,100,000
Consolidated properties
Real estate properties
Number of Buildings | building	36
Approximate Square Feet unaudited (sqft) | ft²	13,372,049
Consolidated properties | Commercial properties
Real estate properties
Number of Buildings | building	35
Approximate Square Feet unaudited (sqft) | ft²	13,289,799
Unconsolidated properties
Real estate properties
Number of Buildings | building	29
Approximate Square Feet unaudited (sqft) | ft²	15,762,735
Unconsolidated properties | Commercial properties
Real estate properties
Number of Buildings | building	21
Approximate Square Feet unaudited (sqft) | ft²	14,098,961
Manhattan
Real estate properties
Number of Buildings | building	49
Approximate Square Feet unaudited (sqft) | ft²	26,525,960
Weighted Average Occupancy unaudited (as a percent)	93.50%
Manhattan | Office
Real estate properties
Number of Buildings | building	27
Approximate Square Feet unaudited (sqft) | ft²	21,395,528
Weighted Average Occupancy unaudited (as a percent)	93.40%
Manhattan | Retail
Real estate properties
Number of Buildings | building	10
Approximate Square Feet unaudited (sqft) | ft²	312,036
Weighted Average Occupancy unaudited (as a percent)	94.60%
Manhattan | Development/Redevelopment
Real estate properties
Number of Buildings | building	12
Approximate Square Feet unaudited (sqft) | ft²	4,818,396
Manhattan | Residential
Real estate properties
Number of Buildings | building	9
Approximate Square Feet unaudited (sqft) | ft²	1,746,024
Weighted Average Occupancy unaudited (as a percent)	79.10%
Manhattan | Consolidated properties
Real estate properties
Number of Buildings | building	28
Approximate Square Feet unaudited (sqft) | ft²	12,426,999
Manhattan | Consolidated properties | Office
Real estate properties
Number of Buildings | building	18
Approximate Square Feet unaudited (sqft) | ft²	10,526,345
Manhattan | Consolidated properties | Retail
Real estate properties
Number of Buildings | building	1
Approximate Square Feet unaudited (sqft) | ft²	10,040
Manhattan | Consolidated properties | Development/Redevelopment
Real estate properties
Number of Buildings | building	9
Approximate Square Feet unaudited (sqft) | ft²	1,890,614
Manhattan | Consolidated properties | Residential
Real estate properties
Number of Buildings | building	1
Approximate Square Feet unaudited (sqft) | ft²	82,250
Manhattan | Unconsolidated properties
Real estate properties
Number of Buildings | building	21
Approximate Square Feet unaudited (sqft) | ft²	14,098,961
Manhattan | Unconsolidated properties | Office
Real estate properties
Number of Buildings | building	9
Approximate Square Feet unaudited (sqft) | ft²	10,869,183
Manhattan | Unconsolidated properties | Retail
Real estate properties
Number of Buildings | building	9
Approximate Square Feet unaudited (sqft) | ft²	301,996
Manhattan | Unconsolidated properties | Development/Redevelopment
Real estate properties
Number of Buildings | building	3
Approximate Square Feet unaudited (sqft) | ft²	2,927,782
Manhattan | Unconsolidated properties | Residential
Real estate properties
Number of Buildings | building	8
Approximate Square Feet unaudited (sqft) | ft²	1,663,774
Suburban | Office
Real estate properties
Number of Buildings | building	7
Approximate Square Feet unaudited (sqft) | ft²	862,800
Weighted Average Occupancy unaudited (as a percent)	81.60%
Suburban | Consolidated properties | Office
Real estate properties
Number of Buildings | building	7
Approximate Square Feet unaudited (sqft) | ft²	862,800
Suburban | Unconsolidated properties | Office
Real estate properties
Number of Buildings | building	0
Approximate Square Feet unaudited (sqft) | ft²	0

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Organization and Basis of Presentation - Subsequent Events (Details) $ in Millions	1 Months Ended
	Apr. 30, 2021 USD ($)
Subsequent Event | 461 Fifth Avenue
Subsequent Event [Line Items]
Payments to acquire real estate	$ 28.0

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Significant Accounting Policies - Investments in Commercial Real Estate Properties (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Investment in Commercial Real Estate Properties
Rental revenue from amortization of acquired leases	$ 1,900,000	$ 1,200,000
Identified intangible assets (included in other assets):
Gross amount	239,562,000		$ 215,673,000
Accumulated amortization	(204,386,000)		(190,523,000)
Net	35,176,000		25,150,000
Identified intangible liabilities (included in deferred revenue):
Gross amount	242,334,000		241,409,000
Accumulated amortization	(233,766,000)		(230,479,000)
Net	8,568,000		10,930,000
Net intangible assets reclassified to assets held for sale	0		0
Net intangible liabilities reclassified to liabilities relates to assets held for sale	$ 0		$ 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)	15 years
Maximum | Below-market leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)	15 years
Maximum | In-place leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)	15 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

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Significant Accounting Policies - Investment in Marketable Securities (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($) security	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Investment in Marketable Securities
Marketable securities	$ 23,784,000		$ 28,570,000
Equity marketable securities	23,784,000		28,570,000
Proceeds from sale of marketable securities	$ 5,000,000.0	$ 0
Number of marketable securities sold | security	1
Fair Value
Investment in Marketable Securities
Marketable securities	$ 23,784,000		28,570,000
Equity marketable securities
Investment in Marketable Securities
Equity marketable securities	0		0
Commercial mortgage-backed securities
Investment in Marketable Securities
Marketable securities	23,784,000		28,570,000
Cost basis of commercial mortgage-backed securities	$ 23,000,000.0		27,500,000
Number of securities in continuous unrealized loss position | security	1
Unrealized loss	$ 700,000		700,000
Fair value of security in a continuous unrealized loss position for less than 12 months	$ 7,100,000		$ 7,000,000.0

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Significant Accounting Policies - Revenue Recognition/Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income taxes
Federal, state and local tax provision	$ 0.7	$ 1.1

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Significant Accounting Policies - Concentrations of Credit Risk/Accounting Standards Updates (Details) - Annualized rent - Customer concentration	3 Months Ended
	Mar. 31, 2021 Tenant
Concentration of Credit Risk
Number of tenants (tenants)	1
Maximum percentage of annualized rent for any one tenant not individually disclosed (percent) (more than)	5.00%
11 Madison Avenue
Concentration of Credit Risk
Percentage of concentration (percent)	9.20%
420 Lexington Avenue
Concentration of Credit Risk
Percentage of concentration (percent)	7.20%
1185 Avenue of the Americas
Concentration of Credit Risk
Percentage of concentration (percent)	7.10%
1515 Broadway
Concentration of Credit Risk
Percentage of concentration (percent)	6.90%
220 East 42nd Street
Concentration of Credit Risk
Percentage of concentration (percent)	6.20%
280 Park Avenue
Concentration of Credit Risk
Percentage of concentration (percent)	5.80%
485 Lexington Avenue
Concentration of Credit Risk
Percentage of concentration (percent)	5.10%
Tenant 1
Concentration of Credit Risk
Percentage of concentration (percent)	5.90%

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Property Acquisitions (Details) $ in Millions	Mar. 31, 2021 ft²	Jan. 31, 2021 USD ($) ft²
Property Acquisitions
Area of Real Estate Property	29,134,784
885 Third Avenue
Property Acquisitions
Area of Real Estate Property		625,000
Gross Asset Valuation (in millions) | $		$ 387.9

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Properties Held for Sale and Property Dispositions (Details) $ in Millions	1 Months Ended
	Mar. 31, 2021 USD ($) ft²	Feb. 28, 2021 USD ($) ft²	Jan. 31, 2021 USD ($) ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area of Real Estate Property | ft²	29,134,784
712 Madison Avenue
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area of Real Estate Property | ft²			6,600
Sales Price			$ 43.0
Gain (loss)			$ (1.4)
133 Greene Street
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area of Real Estate Property | ft²		6,425
Sales Price		$ 15.8
Gain (loss)		$ 0.2
106 Spring Street (2)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area of Real Estate Property | ft²	5,928
Sales Price	$ 35.0
Gain (loss)	$ (2.8)

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Debt and Preferred Equity Investments - Rollforward of Net Book Balance (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance at beginning of period	$ 1,076,542	$ 1,580,306
Redemptions/Sales/Syndications/Equity Ownership/Amortization	0	(1,048,643)
Net change in loan loss reserves	0	(11,463)
Balance at end of period	1,097,202	1,076,542
Debt Investments in Mortgage Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Originations/Accretion	17,465	389,300
Preferred equity investments
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Originations/Accretion	$ 3,195	$ 167,042

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Debt and Preferred Equity Investments - Debt and Preferred Equity Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Carrying Value	$ 1,097,202	$ 1,076,542
Senior Financing	6,565,960
Total floating rate
Debt Instrument [Line Items]
Carrying Value	352,650
Face Value	361,828
Total fixed rate
Debt Instrument [Line Items]
Carrying Value	744,552
Face Value	758,404
Senior Mortgage Debt
Debt Instrument [Line Items]
Carrying Value	65,291
Senior Financing	$ 0
Weighted Average Yield at End of Period	4.74%
Senior Mortgage Debt | Total floating rate
Debt Instrument [Line Items]
Carrying Value	$ 64,042
Face Value	64,649
Senior Mortgage Debt | Total fixed rate
Debt Instrument [Line Items]
Carrying Value	1,249
Face Value	1,250
Junior Mortgage Debt
Debt Instrument [Line Items]
Carrying Value	50,026
Senior Financing	$ 127,000
Weighted Average Yield at End of Period	7.82%
Junior Mortgage Debt | Total floating rate
Debt Instrument [Line Items]
Carrying Value	$ 7,207
Face Value	12,000
Junior Mortgage Debt | Total fixed rate
Debt Instrument [Line Items]
Carrying Value	42,819
Face Value	43,000
Mezzanine Debt
Debt Instrument [Line Items]
Carrying Value	718,904
Senior Financing	$ 4,476,210
Weighted Average Yield at End of Period	5.86%
Mezzanine Debt | Total floating rate
Debt Instrument [Line Items]
Carrying Value	$ 281,401
Face Value	285,179
Mezzanine Debt | Total fixed rate
Debt Instrument [Line Items]
Carrying Value	437,503
Face Value	449,102
Preferred Equity
Debt Instrument [Line Items]
Carrying Value	262,981
Senior Financing	$ 1,962,750
Weighted Average Yield at End of Period	9.94%
Preferred Equity | Total floating rate
Debt Instrument [Line Items]
Carrying Value	$ 0
Face Value	0
Preferred Equity | Total fixed rate
Debt Instrument [Line Items]
Carrying Value	262,981
Face Value	$ 265,052
Minimum | Senior Mortgage Debt | Total fixed rate
Debt Instrument [Line Items]
Interest rate	3.50%
Minimum | Junior Mortgage Debt | Total fixed rate
Debt Instrument [Line Items]
Interest rate	6.25%
Minimum | Mezzanine Debt | Total fixed rate
Debt Instrument [Line Items]
Interest rate	2.90%
Minimum | Preferred Equity | Total fixed rate
Debt Instrument [Line Items]
Interest rate	6.50%
Maximum | Mezzanine Debt | Total fixed rate
Debt Instrument [Line Items]
Interest rate	14.30%
Maximum | Preferred Equity | Total fixed rate
Debt Instrument [Line Items]
Interest rate	11.00%
LIBOR | Minimum | Senior Mortgage Debt | Total floating rate
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
LIBOR | Minimum | Junior Mortgage Debt | Total floating rate
Debt Instrument [Line Items]
Basis spread on variable rate	7.25%
LIBOR | Minimum | Mezzanine Debt | Total floating rate
Debt Instrument [Line Items]
Basis spread on variable rate	4.95%
LIBOR | Maximum | Senior Mortgage Debt | Total floating rate
Debt Instrument [Line Items]
Basis spread on variable rate	3.50%
LIBOR | Maximum | Mezzanine Debt | Total floating rate
Debt Instrument [Line Items]
Basis spread on variable rate	13.61%

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Debt and Preferred Equity Investments - Rollforward of Total Allowance for Loan Loss Reserves (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($) loan	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Loan loss reserve activity
Balance at beginning of year	$ 13,213	$ 1,750	$ 1,750
Current period provision for loan loss	0	2,800	20,693
Write-offs charged against the allowance	0		(37,033)
Balance at end of period	$ 13,213		13,213
Number of financing receivables on non-accrual without allowance for loan loss | loan	1
Financing receivable on non-accrual without allowance	$ 225,400
Investments Sold In 2020
Loan loss reserve activity
Write-offs charged against the allowance			(19,000)
Cumulative Effect, Period of Adoption, Adjustment
Loan loss reserve activity
Balance at beginning of year	$ 0	$ 27,803	27,803
Balance at end of period			$ 0

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Debt and Preferred Equity Investments - Investment In Financing Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying value	$ 1,097,202	$ 1,076,542
2020	0
2019	361,444
2018	297,924
Prior	437,834
1 - Low Risk Assets - Low probability of loss
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying value	712,994	695,035
2020	0
2019	361,444
2018	56,639
Prior	294,911
2 - Watch List Assets - Higher potential for loss
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying value	367,859	365,167
2020	0
2019	0
2018	241,285
Prior	126,574
3 - High Risk Assets - Loss more likely than not
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying value	16,349	$ 16,340
2020	0
2019	0
2018	0
Prior	$ 16,349

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Debt and Preferred Equity Investments - Debt Investment (Details) - USD ($)	1 Months Ended	3 Months Ended
	Apr. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Aggregate weighted average current yield (as a percent)		5.90%
Debt Investments Held [Abstract]
Carrying Value		$ 1,097,202,000	$ 1,076,542,000
Carrying Value		1,097,202,000	1,076,542,000
Junior Mortgage Due July 2021
Debt Investments Held [Abstract]
Amount participated out		66,600,000
Mezzanine Loan With Maturity June 2023
Debt Investments Held [Abstract]
Loan interest income		0
Mezzanine Loan with an Initial Maturity Date of June 2024
Debt Investments Held [Abstract]
Amount participated out		12,000,000.0
Loan interest income		0
Mezzanine Loan Due March 2022
Debt Investments Held [Abstract]
Amount participated out		400,000
Debt Investments in Mortgage Loans
Debt Investments Held [Abstract]
Future Funding Obligations		106,935,000
Senior Financing		4,543,210,000
Allowance for loan loss		(13,213,000)	(13,213,000)
Carrying Value		834,221,000	816,756,000
Total fixed rate
Debt Investments Held [Abstract]
Future Funding Obligations		0
Senior Financing		2,782,737,000
Carrying Value		488,201,000	477,509,000
Total fixed rate | Junior Mortgage Due July 2021
Debt Investments Held [Abstract]
Future Funding Obligations		0
Senior Financing		67,000,000
Carrying Value		42,820,000	32,888,000
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 | Mortgage/Mezzanine Loan Due October 2021
Debt Investments Held [Abstract]
Future Funding Obligations		0
Senior Financing		63,750,000
Carrying Value		56,246,000	56,244,000
Total fixed 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		41,652,000	41,057,000
Total fixed rate | Mezzanine Loan With Maturity June 2023
Debt Investments Held [Abstract]
Future Funding Obligations		0
Senior Financing		359,237,000
Carrying Value		225,367,000	225,204,000
Total fixed rate | Mezzanine Loan with an Initial Maturity Date of June 2024
Debt Investments Held [Abstract]
Future Funding Obligations		0
Senior Financing		105,000,000
Carrying Value		13,366,000	13,366,000
Total fixed rate | Mezzanine Loan, with an Initial Maturity Date of 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 June 2027
Debt Investments Held [Abstract]
Future Funding Obligations		0
Senior Financing		1,712,750,000
Carrying Value		55,250,000	55,250,000
Total fixed rate | Mezzanine Loan With Initial Maturity Date Of December 2029
Debt Investments Held [Abstract]
Future Funding Obligations		0
Senior Financing		85,000,000
Carrying Value		20,000,000	20,000,000
Total floating rate
Debt Investments Held [Abstract]
Future Funding Obligations		106,935,000
Senior Financing		1,760,473,000
Carrying Value		359,233,000	352,460,000
Total floating rate | Mezzanine Loan Due April 2021
Debt Investments Held [Abstract]
Future Funding Obligations		0
Senior Financing		275,000,000
Carrying Value		49,992,000	49,956,000
Total floating rate | Junior Mortgage Participation/Mezzanine Loan Due July 2021
Debt Investments Held [Abstract]
Future Funding Obligations		0
Senior Financing		60,000,000
Carrying Value		15,742,000	15,733,000
Total floating rate | Mezzanine Loan Due July 2021
Debt Investments Held [Abstract]
Future Funding Obligations		5,761,000
Senior Financing		177,415,000
Carrying Value		36,639,000	35,318,000
Total floating rate | Mezzanine Loan Due July 2021, 2
Debt Investments Held [Abstract]
Future Funding Obligations		0
Senior Financing		61,744,000
Carrying Value		29,130,000	29,106,000
Total floating rate | Mezzanine Loan Due March 2022
Debt Investments Held [Abstract]
Future Funding Obligations		0
Senior Financing		1,115,000,000
Carrying Value		129,330,000	127,915,000
Total floating rate | Mezzanine Loan Due April 2022 | Subsequent Event
Debt Investments Held [Abstract]
Extension term	1 year
Total floating rate | Mortgage/Mezzanine Loan Due May 2022
Debt Investments Held [Abstract]
Future Funding Obligations		6,769,000
Senior Financing		0
Carrying Value		60,922,000	60,532,000
Total floating rate | Mezzanine Loan Due December 2022
Debt Investments Held [Abstract]
Future Funding Obligations		42,117,000
Senior Financing		0
Carrying Value		15,918,000	14,011,000
Total floating rate | Mezzanine Loan Due May 2023
Debt Investments Held [Abstract]
Future Funding Obligations		52,288,000
Senior Financing		71,314,000
Carrying Value		$ 21,560,000	$ 19,889,000

XML

Debt and Preferred Equity Investments - Preferred Equity Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Preferred equity investment
Aggregate weighted average current yield (as a percent)	5.90%
Carrying Value	$ 1,097,202	$ 1,076,542
Preferred Equity, June 2022
Preferred equity investment
Future Funding Obligations	0
Senior Financing	1,712,750
Carrying Value	156,169	154,691
Preferred Equity, February 2027
Preferred equity investment
Future Funding Obligations	0
Senior Financing	250,000
Carrying Value	$ 106,812	105,095
Preferred equity investments
Preferred equity investment
Aggregate weighted average current yield (as a percent)	9.94%
Future Funding Obligations	$ 0
Senior Financing	1,962,750
Carrying Value	262,981	259,786
Allowance for loan loss	0	0
Total after allowance for loan loss	$ 262,981	$ 259,786

XML

Debt and Preferred Equity Investments - Narrative (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($) segment investment	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)
Preferred equity investment
Number of investments, nonperforming | investment	1
Carrying Value	$ 1,097,202,000		$ 1,076,542,000
Recorded investment, nonaccrual status	$ 27,700,000
Number of portfolio segments of financial receivables (segment) | segment	1		1
Additional amount of financing receivables included in other assets	$ 66,400,000		$ 66,200,000
Current period provision for loan loss	0	$ 2,800,000	20,693,000
Allowance for loan and lease losses, real estate	13,213,000		13,213,000	$ 1,750,000
3 - High Risk Assets - Loss more likely than not
Preferred equity investment
Recorded investment, nonaccrual status	2,500,000
Financing Receivables, Equal to Greater than 90 Days Past Due
Preferred equity investment
Recorded investment, past due	0		0
Cumulative Effect, Period of Adoption, Adjustment
Preferred equity investment
Allowance for loan and lease losses, real estate			0	$ 27,803,000
Total floating rate
Preferred equity investment
Carrying Value	359,233,000		$ 352,460,000
Total floating rate | Mortgage/Mezzanine Loan Due March 2020
Preferred equity investment
Carrying Value	$ 6,800,000

XML

Investments in Unconsolidated Joint Ventures - Additional Information (Details) $ in Thousands	1 Months Ended		3 Months Ended		12 Months Ended
	Apr. 30, 2021 USD ($)	Oct. 31, 2016	Mar. 31, 2021 USD ($) ft² unit partner	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
General information on each joint venture
Equity method investments | $			$ 3,698,701		$ 3,823,322
Net equity investment in VIEs in which the entity is not primary beneficiary | $			$ 132,700		$ 134,000
Unaudited Approximate Square Feet (sqft)			29,134,784
(Loss) gain on sale of real estate, net | $			$ (1,388)	$ 72,636
One Madison Avenue
General information on each joint venture
Ownership percentage deconsolidated					50.50%
Investment fair value adjustment | $			$ 2,700		$ 187,500
Stonehenge Portfolio
General information on each joint venture
Ownership Interest Disposed		90.00%
East 400 Street 57
General information on each joint venture
Ownership Interest Disposed		51.00%
One Madison Avenue
General information on each joint venture
Investment in joint venture aggregate equity committed by partner | $					$ 492,200
Investment in joint venture aggregate maximum ownership percentage					49.50%
Investment in joint venture, number of partners | partner			2
Investment in joint venture, ownership percentage			9.00%
East 400 Street 57
General information on each joint venture
Ownership percentage in disposed asset		49.00%
East 400 Street 57 | Subsequent Event
General information on each joint venture
Asset impairment charges | $	$ 5,700
21 East 66th Street | Three Retail and Two Residential Units
General information on each joint venture
Ownership Interest Disposed			32.28%
Number of stores | unit			3
Number of residential units | unit			1
21 East 66th Street | Three Residential Units
General information on each joint venture
Ownership Interest Disposed			16.14%
Number of residential units | unit			3
Joint venture
General information on each joint venture
Equity method investments | $			$ 3,698,701
Equity method investments with negative book value | $			$ 92,400
Joint venture | 100 Park Avenue
General information on each joint venture
Ownership Interest Disposed			49.90%
Economic Interest (as a percent)			49.90%
Unaudited Approximate Square Feet (sqft)			834,000
Joint venture | 717 Fifth Avenue
General information on each joint venture
Ownership Interest Disposed			10.92%
Economic Interest (as a percent)			10.92%
Unaudited Approximate Square Feet (sqft)			119,500
Joint venture | 800 Third Avenue
General information on each joint venture
Ownership Interest Disposed			60.52%
Economic Interest (as a percent)			60.52%
Unaudited Approximate Square Feet (sqft)			526,000
Interest rate, fixed rate debt (as a percent)			3.37%
Joint venture | 919 Third Avenue
General information on each joint venture
Ownership Interest Disposed			51.00%
Economic Interest (as a percent)			51.00%
Unaudited Approximate Square Feet (sqft)			1,454,000
Interest rate, fixed rate debt (as a percent)			5.12%
Joint venture | 11 West 34th Street
General information on each joint venture
Ownership Interest Disposed			30.00%
Economic Interest (as a percent)			30.00%
Unaudited Approximate Square Feet (sqft)			17,150
Joint venture | 280 Park Avenue
General information on each joint venture
Ownership Interest Disposed			50.00%
Economic Interest (as a percent)			50.00%
Unaudited Approximate Square Feet (sqft)			1,219,158
Joint venture | 1552-1560 Broadway
General information on each joint venture
Ownership Interest Disposed			50.00%
Economic Interest (as a percent)			50.00%
Unaudited Approximate Square Feet (sqft)			57,718
Joint venture | 10 East 53rd Street
General information on each joint venture
Ownership Interest Disposed			55.00%
Economic Interest (as a percent)			55.00%
Unaudited Approximate Square Feet (sqft)			354,300
Joint venture | 21 East 66th Street
General information on each joint venture
Ownership Interest Disposed			32.28%
Economic Interest (as a percent)			32.28%
Unaudited Approximate Square Feet (sqft)			13,069
Interest rate, fixed rate debt (as a percent)			3.60%
Joint venture | 650 Fifth Avenue
General information on each joint venture
Ownership Interest Disposed			50.00%
Economic Interest (as a percent)			50.00%
Unaudited Approximate Square Feet (sqft)			69,214
Joint venture | 121 Greene Street
General information on each joint venture
Ownership Interest Disposed			50.00%
Economic Interest (as a percent)			50.00%
Unaudited Approximate Square Feet (sqft)			7,131
Joint venture | Stonehenge Portfolio
General information on each joint venture
Ownership Interest Disposed		10.00%
Unaudited Approximate Square Feet (sqft)			1,439,016
Interest rate, fixed rate debt (as a percent)			3.50%
Joint venture | 605 West 42nd Street
General information on each joint venture
Ownership Interest Disposed			20.00%
Economic Interest (as a percent)			20.00%
Unaudited Approximate Square Feet (sqft)			927,358
Joint venture | 11 Madison Avenue
General information on each joint venture
Ownership Interest Disposed			60.00%
Economic Interest (as a percent)			60.00%
Unaudited Approximate Square Feet (sqft)			2,314,000
Interest rate, fixed rate debt (as a percent)			3.84%
Joint venture | East 400 Street 57
General information on each joint venture
Ownership Interest Disposed			51.00%
Economic Interest (as a percent)			41.00%
Unaudited Approximate Square Feet (sqft)			290,482
Interest rate, fixed rate debt (as a percent)			3.00%
Joint venture | One Vanderbilt
General information on each joint venture
Ownership Interest Disposed			71.01%
Economic Interest (as a percent)			71.01%
Unaudited Approximate Square Feet (sqft)			1,657,198
Joint venture | Worldwide Plaza
General information on each joint venture
Ownership Interest Disposed			24.35%
Economic Interest (as a percent)			24.35%
Unaudited Approximate Square Feet (sqft)			2,048,725
Interest rate, fixed rate debt (as a percent)			3.98%
Joint venture | 1515 Broadway
General information on each joint venture
Ownership Interest Disposed			56.87%
Economic Interest (as a percent)			56.87%
Unaudited Approximate Square Feet (sqft)			1,750,000
Interest rate, fixed rate debt (as a percent)			3.93%
Joint venture | 2 Herald Square
General information on each joint venture
Ownership Interest Disposed			51.00%
Economic Interest (as a percent)			51.00%
Unaudited Approximate Square Feet (sqft)			369,000
Joint venture | 115 Spring Street
General information on each joint venture
Ownership Interest Disposed			51.00%
Economic Interest (as a percent)			51.00%
Unaudited Approximate Square Feet (sqft)			5,218
Joint venture | 15 Beekman
General information on each joint venture
Ownership Interest Disposed			20.00%
Economic Interest (as a percent)			20.00%
Unaudited Approximate Square Feet (sqft)			221,884
Joint venture | 85 Fifth Avenue
General information on each joint venture
Ownership Interest Disposed			36.30%
Economic Interest (as a percent)			36.30%
Unaudited Approximate Square Feet (sqft)			12,946
Joint venture | One Madison Avenue
General information on each joint venture
Ownership Interest Disposed			50.50%
Economic Interest (as a percent)			50.50%
Unaudited Approximate Square Feet (sqft)			1,048,700

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Investments in Unconsolidated Joint Ventures - Acquisition, Development and Construction Arrangements/Sale of Joint Venture Interest or Property (Details) - USD ($)	1 Months Ended	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2021	Mar. 31, 2020
Schedule of Equity Method Investments [Line Items]
Equity in net (loss) gain on sale of interest in unconsolidated joint venture/real estate		$ (12,629,000)	$ 0
55 West 46th Street, Tower 46 | Joint venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest Disposed	25.00%	25.00%
Gross Asset Valuation	$ 275,000.0	$ 275,000.0
Equity in net (loss) gain on sale of interest in unconsolidated joint venture/real estate	$ (15,200)

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Investments in Unconsolidated Joint Ventures - Mortgages and Other Loans Payable (Details)	1 Months Ended	3 Months Ended
	Mar. 31, 2021 USD ($) partner mortgage	Mar. 31, 2021 USD ($) extension mortgage partner	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Total fixed rate debt	$ 1,081,142,000	$ 1,081,142,000	$ 1,083,683,000
Total floating rate debt	786,521,000	786,521,000	917,677,000
Revolving credit facility, net	625,809,000	625,809,000	105,262,000
Joint venture
Debt Instrument [Line Items]
Total fixed rate debt	5,328,127,000	5,328,127,000	5,604,858,000
Total floating rate debt	4,185,048,000	4,185,048,000	4,257,792,000
Total fixed rate and floating rate debt	9,513,175,000	9,513,175,000	9,862,650,000
Deferred financing costs, net	(98,252,000)	(98,252,000)	(113,446,000)
Total joint venture mortgages and other loans payable, net	$ 9,414,923,000	$ 9,414,923,000	9,749,204,000
Joint venture | 717 Fifth Avenue
Debt Instrument [Line Items]
Economic Interest (as a percent)	10.92%	10.92%
Joint venture | 717 Fifth Avenue | Mortgage loan
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.45%	4.45%
Total fixed rate debt	$ 300,000,000	$ 300,000,000	300,000,000
Joint venture | 717 Fifth Avenue | Mezzanine loans
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	5.50%	5.50%
Total fixed rate debt	$ 355,328,000	$ 355,328,000	355,328,000
Joint venture | 650 Fifth Avenue
Debt Instrument [Line Items]
Economic Interest (as a percent)	50.00%	50.00%
Joint venture | 650 Fifth Avenue | Mortgage loan
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.46%	4.46%
Total fixed rate debt	$ 210,000,000	$ 210,000,000	210,000,000
Joint venture | 650 Fifth Avenue | Mezzanine loans
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	5.45%	5.45%
Total fixed rate debt	$ 65,000,000	$ 65,000,000	65,000,000
Joint venture | East 21 Street 66 [Member]
Debt Instrument [Line Items]
Economic Interest (as a percent)	32.28%	32.28%
Interest rate, fixed rate debt (as a percent)	3.60%	3.60%
Interest rate, floating rate debt (as a percent)	2.75%	2.75%
Total fixed rate debt	$ 12,000,000	$ 12,000,000	12,000,000
Total floating rate debt	$ 666,000	$ 666,000	677,000
Joint venture | 919 Third Avenue
Debt Instrument [Line Items]
Economic Interest (as a percent)	51.00%	51.00%
Interest rate, fixed rate debt (as a percent)	5.12%	5.12%
Total fixed rate debt	$ 500,000,000	$ 500,000,000	500,000,000
Joint venture | 1515 Broadway
Debt Instrument [Line Items]
Economic Interest (as a percent)	56.87%	56.87%
Interest rate, fixed rate debt (as a percent)	3.93%	3.93%
Total fixed rate debt	$ 815,876,000	$ 815,876,000	820,607,000
Joint venture | 11 Madison Avenue
Debt Instrument [Line Items]
Economic Interest (as a percent)	60.00%	60.00%
Interest rate, fixed rate debt (as a percent)	3.84%	3.84%
Total fixed rate debt	$ 1,400,000,000	$ 1,400,000,000	1,400,000,000
Joint venture | 800 Third Avenue
Debt Instrument [Line Items]
Economic Interest (as a percent)	60.52%	60.52%
Interest rate, fixed rate debt (as a percent)	3.37%	3.37%
Total fixed rate debt	$ 177,000,000	$ 177,000,000	177,000,000
Joint venture | East 400 Street 57
Debt Instrument [Line Items]
Economic Interest (as a percent)	41.00%	41.00%
Interest rate, fixed rate debt (as a percent)	3.00%	3.00%
Total fixed rate debt	$ 97,024,000	$ 97,024,000	97,024,000
Joint venture | Worldwide Plaza
Debt Instrument [Line Items]
Economic Interest (as a percent)	24.35%	24.35%
Interest rate, fixed rate debt (as a percent)	3.98%	3.98%
Total fixed rate debt	$ 1,200,000,000	$ 1,200,000,000	1,200,000,000
Joint venture | Stonehenge Portfolio
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.50%	3.50%
Total fixed rate debt	$ 195,899,000	$ 195,899,000	195,899,000
Joint venture | 885 Third Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)
Total fixed rate debt	$ 0	$ 0	272,000,000
Joint venture | 121 Greene Street
Debt Instrument [Line Items]
Economic Interest (as a percent)	50.00%	50.00%
Interest rate, floating rate debt (as a percent)	2.00%	2.00%
Total floating rate debt	$ 13,771,000	$ 13,771,000	15,000,000
Period of extension options	1 year
Joint venture | 280 Park Avenue
Debt Instrument [Line Items]
Economic Interest (as a percent)	50.00%	50.00%
Interest rate, floating rate debt (as a percent)	1.73%	1.73%
Total floating rate debt	$ 1,200,000,000	$ 1,200,000,000	1,200,000,000
Joint venture | One Vanderbilt
Debt Instrument [Line Items]
Economic Interest (as a percent)	71.01%	71.01%
Interest rate, floating rate debt (as a percent)	2.50%	2.50%
Total floating rate debt	$ 1,283,292,000	$ 1,283,292,000	1,210,329,000
Joint venture | One Vanderbilt | Construction Loans
Debt Instrument [Line Items]
Maximum facility capacity	$ 1,750,000,000	$ 1,750,000,000
Term (in Years)		3 years
Number of extension options | extension		2
Period of extension options		1 year
Joint venture | 1552 Broadway
Debt Instrument [Line Items]
Economic Interest (as a percent)	50.00%	50.00%
Interest rate, floating rate debt (as a percent)	2.65%	2.65%
Total floating rate debt	$ 195,000,000	$ 195,000,000	195,000,000
Joint venture | 2 Herald Square
Debt Instrument [Line Items]
Economic Interest (as a percent)	51.00%	51.00%
Interest rate, floating rate debt (as a percent)	1.45%	1.45%
Total floating rate debt	$ 214,500,000	$ 214,500,000	214,500,000
Joint venture | 11 West 34th Street
Debt Instrument [Line Items]
Economic Interest (as a percent)	30.00%	30.00%
Interest rate, floating rate debt (as a percent)	1.45%	1.45%
Total floating rate debt	$ 23,000,000	$ 23,000,000	23,000,000
Joint venture | 115 Spring Street
Debt Instrument [Line Items]
Economic Interest (as a percent)	51.00%	51.00%
Interest rate, floating rate debt (as a percent)	3.40%	3.40%
Total floating rate debt	$ 65,550,000	$ 65,550,000	65,550,000
Joint venture | 100 Park Avenue
Debt Instrument [Line Items]
Economic Interest (as a percent)	49.90%	49.90%
Interest rate, floating rate debt (as a percent)	2.25%	2.25%
Total floating rate debt	$ 360,000,000	$ 360,000,000	360,000,000
Joint venture | 15 Beekman
Debt Instrument [Line Items]
Economic Interest (as a percent)	20.00%	20.00%
Interest rate, floating rate debt (as a percent)	1.50%	1.50%
Total floating rate debt	$ 19,165,000	$ 19,165,000	11,212,000
Joint venture | 15 Beekman | Construction Loans
Debt Instrument [Line Items]
Maximum facility capacity	$ 125,000,000.0	$ 125,000,000.0
Joint venture | 10 East 53rd Street
Debt Instrument [Line Items]
Economic Interest (as a percent)	55.00%	55.00%
Interest rate, floating rate debt (as a percent)	1.35%	1.35%
Total floating rate debt	$ 220,000,000	$ 220,000,000	220,000,000
Joint venture | One Madison Avenue
Debt Instrument [Line Items]
Economic Interest (as a percent)	50.50%	50.50%
Interest rate, floating rate debt (as a percent)	3.35%	3.35%
Total floating rate debt	$ 40,104,000	$ 40,104,000	0
Joint venture | One Madison Avenue | Construction Loans
Debt Instrument [Line Items]
Maximum facility capacity	$ 1,250,000,000	$ 1,250,000,000
Term (in Years)		5 years
Number of extension options | extension		1
Period of extension options		1 year
Joint venture | 605 West 42nd Street
Debt Instrument [Line Items]
Economic Interest (as a percent)	20.00%	20.00%
Interest rate, floating rate debt (as a percent)	1.44%	1.44%
Total floating rate debt	$ 550,000,000	$ 550,000,000	550,000,000
Joint venture | 55 West 46th Street
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)
Total floating rate debt	$ 0	$ 0	$ 192,524,000
Secured Debt, Initial Maturity April 2028 | Joint venture | Stonehenge Portfolio
Debt Instrument [Line Items]
Total fixed rate debt	$ 132,400,000	$ 132,400,000
Number of mortgages | partner	3	3
Secured Debt, Initial Maturity July 2029 | Joint venture | Stonehenge Portfolio
Debt Instrument [Line Items]
Total fixed rate debt	$ 63,500,000	$ 63,500,000
Number of mortgages | mortgage	2	2

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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
		Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Assets
Commercial real estate property, net		$ 5,825,629		$ 5,399,002
Cash and restricted cash		304,999	$ 554,195	266,059
Tenant and other receivables, related party receivables, and deferred rents receivable		42,505		44,507
Other assets		445,635		448,213
Total assets	[1]	12,044,045		11,707,567
Liabilities and equity
Mortgages and other loans payable, net		1,848,701		1,979,972
Lease liabilities		455,385		339,458
Other liabilities		267,908		302,798
Equity		4,935,620	5,343,965	4,935,795	$ 5,517,198
Total liabilities and equity/capital		12,044,045		11,707,567
Company's investments in unconsolidated joint ventures		3,698,701		3,823,322
Investments difference between carrying amount and underlying equity		174,200
Combined statements of income for the unconsolidated joint ventures
Total revenues		226,102	314,303
Operating expenses		42,284	53,866
Real estate taxes		45,411	46,622
Interest expense before capitalized interest		39,868	56,813
Amortization of deferred financing costs		3,774	2,500
Depreciation and amortization		62,996	68,279
Total expenses		207,499	247,011
Net (loss) income		(3,855)	127,114
Company's equity in net (loss) income from unconsolidated joint ventures		(2,864)	(12,814)
Joint venture
Assets
Commercial real estate property, net		15,243,331		16,143,880
Cash and restricted cash		317,753		357,076
Tenant and other receivables, related party receivables, and deferred rents receivable		412,203		403,883
Other assets		1,950,444		2,001,612
Total assets		17,923,731		18,906,451
Liabilities and equity
Mortgages and other loans payable, net		9,414,923		9,749,204
Deferred revenue		1,311,191		1,341,571
Lease liabilities		985,622		1,002,563
Other liabilities		373,400		464,107
Equity		5,838,595		6,349,006
Total liabilities and equity/capital		17,923,731		$ 18,906,451
Company's investments in unconsolidated joint ventures		3,698,701
Combined statements of income for the unconsolidated joint ventures
Total revenues		301,541	282,520
Operating expenses		46,233	51,590
Real estate taxes		54,592	53,372
Operating lease, rent		5,644	6,361
Interest expense before capitalized interest		78,749	86,324
Amortization of deferred financing costs		6,384	4,814
Depreciation and amortization		114,879	98,584
Total expenses		306,481	301,045
Net (loss) income		(4,940)	(18,525)
Company's equity in net (loss) income from unconsolidated joint ventures		(2,864)	(12,814)
Management Service, Base | Joint venture
Investment in Unconsolidated Joint Ventures
Management fees, base revenue		$ 2,400	$ 2,200

[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: $179.6 million and $41.2 million of land, $282.3 million and $57.9 million of building and improvements, $2.0 million and $2.0 million of building and leasehold improvements, $53.2 million and $37.8 million of right of use assets, $16.4 million and $10.3 million of accumulated depreciation, $297.1 million and $289.5 million of other assets included in other line items, $368.6 million and $94.0 million of real estate debt, net, $0.9 million and $0.7 million of accrued interest payable, $45.3 million and $29.9 million of lease liabilities, and $31.2 million and $56.6 million of other liabilities included in other line items as of March 31, 2021 and December 31, 2020, respectively.

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Deferred Costs (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred leasing costs	$ 448,197	$ 447,002
Less: accumulated amortization	(277,945)	(269,834)
Deferred costs, net	$ 170,252	$ 177,168

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Mortgages and Other Loans Payable (Details)	1 Months Ended	3 Months Ended
	Jun. 30, 2020	Mar. 31, 2021 USD ($) extension	Dec. 31, 2020 USD ($)	Apr. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)
Debt Instrument [Line Items]
Total fixed rate debt		$ 1,081,142,000	$ 1,083,683,000
Total floating rate debt		786,521,000	917,677,000
Total mortgages and other loans payable		1,867,663,000	2,001,360,000
Deferred financing costs, net of amortization		(18,962,000)	(21,388,000)
Total mortgages and other loans payable, net		1,848,701,000	1,979,972,000
Book value of collateral		2,400,000,000	2,500,000,000
Outstanding under line of credit facility		625,809,000	105,262,000
FHLB Facility, January 2021, 1
Debt Instrument [Line Items]
Total floating rate debt		0	10,000,000
FHLB Facility, January 2021, 2
Debt Instrument [Line Items]
Total floating rate debt		0	15,000,000
FHLB Facility January 2021
Debt Instrument [Line Items]
Total floating rate debt		0	35,000,000
2017 Master Repurchase Agreement
Debt Instrument [Line Items]
Total floating rate debt		0	0
Maximum facility capacity		400,000,000		$ 400,000,000.0	$ 300,000,000.0
Margin calls		$ 0
Extension option exercised, term	1 year	1 year
Outstanding under line of credit facility		$ 0
100 Church Street
Debt Instrument [Line Items]
Total fixed rate debt		$ 203,697,000	204,875,000
100 Church Street | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		4.68%
420 Lexington Avenue
Debt Instrument [Line Items]
Total fixed rate debt		$ 292,672,000	294,035,000
420 Lexington Avenue | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		3.99%
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		$ 34,773,000	34,773,000
Total fixed rate debt		33,900,000
Subordinate loan		$ 900,000
1080 Amsterdam Avenue | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		3.59%
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%
185 Broadway
Debt Instrument [Line Items]
Total floating rate debt		$ 168,870,000	158,478,000
185 Broadway | Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		2.85%
609 Fifth Avenue
Debt Instrument [Line Items]
Total floating rate debt		$ 57,651,000	57,651,000
609 Fifth Avenue | Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		2.95%
220 East 42nd Street
Debt Instrument [Line Items]
Total floating rate debt		$ 510,000,000	510,000,000
220 East 42nd Street | Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		2.75%
719 Seventh Avenue
Debt Instrument [Line Items]
Total floating rate debt		$ 50,000,000	50,000,000
719 Seventh Avenue | Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		1.20%
133 Greene Street
Debt Instrument [Line Items]
Total floating rate debt		$ 0	15,523,000
106 Spring Street
Debt Instrument [Line Items]
Total floating rate debt		0	38,025,000
712 Madison Avenue
Debt Instrument [Line Items]
Total floating rate debt		$ 0	$ 28,000,000
Construction Loans | 185 Broadway
Debt Instrument [Line Items]
Term (in Years)		3 years
Maximum facility capacity		$ 225,000,000.0
Number of extension options | extension		2
Period of extension options		1 year

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Corporate Indebtedness - Additional Information (Details)	3 Months Ended
	Mar. 31, 2021 USD ($) extension	Dec. 31, 2020 USD ($)
Corporate Indebtedness
Outstanding under line of credit facility	$ 625,809,000	$ 105,262,000
Term Loan B, Maturity November 21, 2024 | Term loan
Corporate Indebtedness
Credit facility, maximum borrowing capacity	$ 200,000,000.0
Term Loan B, Maturity November 21, 2024 | LIBOR | Term loan
Corporate Indebtedness
Interest rate added to base rate (as a percent)	1.00%
Term Loan B, Maturity November 21, 2024 | LIBOR | Minimum | Term loan
Corporate Indebtedness
Interest rate added to base rate (as a percent)	0.85%
Term Loan B, Maturity November 21, 2024 | LIBOR | Maximum | Term loan
Corporate Indebtedness
Interest rate added to base rate (as a percent)	1.65%
Revolving credit facility
Corporate Indebtedness
Facility fee (as a percent)	0.20%
Outstanding under line of credit facility	$ 630,000,000.0
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%
Term loan
Corporate Indebtedness
Long-term debt, carrying value	$ 1,500,000,000
Term loan | Line of Credit
Corporate Indebtedness
Long-term debt, carrying value	1,500,000,000	1,500,000,000
2012 Credit Facility
Corporate Indebtedness
Letters of credit	16,500,000
Ability to borrow under line of credit facility	900,000,000
2012 Credit Facility | Line of Credit
Corporate Indebtedness
Long-term debt, carrying value	625,800,000	$ 105,300,000
Term Loan A, Maturity March 31, 2023 | Term loan
Corporate Indebtedness
Credit facility, maximum borrowing capacity	$ 1,300,000,000
Term Loan A, Maturity March 31, 2023 | LIBOR | Term loan
Corporate Indebtedness
Interest rate added to base rate (as a percent)	1.10%
Term Loan A, Maturity March 31, 2023 | LIBOR | Minimum | Term loan
Corporate Indebtedness
Interest rate added to base rate (as a percent)	0.90%
Term Loan A, Maturity March 31, 2023 | LIBOR | Maximum | Term loan
Corporate Indebtedness
Interest rate added to base rate (as a percent)	1.75%
Revolving credit facility | Revolving Credit Facility, Maturity March 31, 2022 | Line of Credit
Corporate Indebtedness
Credit facility, maximum borrowing capacity	$ 1,500,000,000
Number of extensions | extension	2
Term of extension	6 months
Maximum borrowing capacity, optional expansion	$ 4,500,000,000
Revolving credit facility | Revolving Credit Facility, Maturity March 31, 2022 | LIBOR | Line of Credit
Corporate Indebtedness
Interest rate added to base rate (as a percent)	1.00%
Revolving credit facility | Revolving Credit Facility, Maturity March 31, 2022 | LIBOR | Minimum | Line of Credit
Corporate Indebtedness
Interest rate added to base rate (as a percent)	0.825%
Revolving credit facility | Revolving Credit Facility, Maturity March 31, 2022 | LIBOR | Maximum | Line of Credit
Corporate Indebtedness
Interest rate added to base rate (as a percent)	1.55%

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Corporate Indebtedness - Senior Unsecured Notes (Details) - USD ($)	1 Months Ended	3 Months Ended
	Oct. 31, 2017	Mar. 31, 2021	Dec. 31, 2020	Apr. 30, 2020
Debt disclosures by scheduled maturity date
Accreted Balance		$ 1,495,620,000	$ 1,495,275,000
Senior unsecured notes
Debt disclosures by scheduled maturity date
Unpaid Principal Balance		1,250,000,000
Accreted Balance		1,251,647,000	1,251,889,000
Deferred financing costs, net		(3,025,000)	(3,670,000)
Accreted Balance, net of deferred financing costs		1,248,622,000	1,248,219,000
Senior unsecured notes | Senior Unsecured Notes Due August 2021
Debt disclosures by scheduled maturity date
Unpaid Principal Balance		350,000,000
Accreted Balance		$ 350,000,000	350,000,000
Coupon Rate (as a percent)		1.52%
Initial Term (in Years)		3 years
Redemption price, percentage		100.00%
Senior unsecured notes | 3.25 Percent Senior Unsecured Notes Due October 2022
Debt disclosures by scheduled maturity date
Unpaid Principal Balance		$ 500,000,000
Accreted Balance		$ 499,830,000	499,803,000
Coupon Rate (as a percent)		3.25%
Initial Term (in Years)		5 years
Senior unsecured notes | 4.50% Senior unsecured notes maturing on December 1, 2022
Debt disclosures by scheduled maturity date
Unpaid Principal Balance		$ 300,000,000
Accreted Balance		$ 301,817,000	302,086,000
Coupon Rate (as a percent)	4.50%	4.50%
Initial Term (in Years)		10 years
Face amount of loan	$ 100,000,000.0
Redemption price, percentage	105.334%
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%
Initial Term (in Years)		10 years
Interest Rate Swap | Senior Unsecured Notes Due August 2021
Debt disclosures by scheduled maturity date
Notional amount				$ 350,000,000.0
Derivative, fixed interest rate				0.54375%

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Corporate Indebtedness - Junior Subordinated Deferrable Interest Debentures and Principal Maturities (Details)	1 Months Ended	3 Months Ended
	Jun. 30, 2005 USD ($)	Mar. 31, 2021 USD ($) quarter
Principal Repayments and Joint Venture Debt
Remaining 2021		$ 526,901,000
2022		1,064,200,000
2023		2,496,594,000
2024		478,029,000
2025		100,823,000
Thereafter		681,116,000
Total principal repayments		$ 5,347,663,000
Trust Preferred Securities
Debt Instrument [Line Items]
Proceeds from issuance of debt	$ 100,000,000.0
LIBOR | Trust Preferred Securities
Debt Instrument [Line Items]
Interest rate added to base rate (as a percent)		1.25%
Interest payment deferment, number of consecutive quarters | quarter		8
Joint venture
Principal Repayments and Joint Venture Debt
Remaining 2021		$ 1,126,896,000
2022		227,701,000
2023		491,066,000
2024		620,843,000
2025		1,403,266,000
Thereafter		552,813,000
Total principal repayments		4,422,585,000
Joint venture | Trust Preferred Securities
Principal Repayments and Joint Venture Debt
Remaining 2021		0
2022		0
2023		0
2024		0
2025		0
Thereafter		100,000,000
Total principal repayments		100,000,000
Joint venture | Mortgages and other loans payable
Scheduled Amortization
Remaining 2021		8,031,000
2022		8,765,000
2023		6,594,000
2024		5,280,000
2025		823,000
Thereafter		924,000
Total amortization of debt		30,417,000
Principal Repayments and Joint Venture Debt
Remaining 2021		168,870,000
2022		255,435,000
2023		560,000,000
2024		272,749,000
2025		0
Thereafter		580,192,000
Total principal repayments		1,837,246,000
Joint venture | Revolving Credit Facility
Principal Repayments and Joint Venture Debt
Remaining 2021		0
2022		0
2023		630,000,000
2024		0
2025		0
Thereafter		0
Total principal repayments		630,000,000
Joint venture | Unsecured Term Loans
Principal Repayments and Joint Venture Debt
Remaining 2021		0
2022		0
2023		1,300,000,000
2024		200,000,000
2025		0
Thereafter		0
Total principal repayments		1,500,000,000
Joint venture | Senior Unsecured Notes
Principal Repayments and Joint Venture Debt
Remaining 2021		350,000,000
2022		800,000,000
2023		0
2024		0
2025		100,000,000
Thereafter		0
Total principal repayments		$ 1,250,000,000

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Corporate Indebtedness - Schedule of Consolidated Interest Expense, Excluding Capitalized Interest (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Interest expense
Interest expense before capitalized interest	$ 39,868	$ 56,813
Interest on financing leases	1,492	1,663
Interest capitalized	(17,583)	(20,483)
Interest income	(389)	(499)
Interest expense, net	$ 23,388	$ 37,494

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Related Party Transactions (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Dec. 31, 2016	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Related Party Transactions
Operating lease rent		$ 6,739	$ 7,367
Amounts due from/to related parties
Due from joint ventures		26,500		$ 27,006
Other		7,810		7,651
Related party receivables		34,310		$ 34,657
Alliance Building Services
Related Party Transactions
Profit participation from related party		300	900
Payments made for services		2,300	3,900
Entity with Stephen L Green ownership interest
Related Party Transactions
Property management fees from related party		100	$ 200
One Vanderbilt
Related Party Transactions
Operating lease rent		100
One Vanderbilt | Marc Holliday
Related Party Transactions
Due from related party		1,400
One Vanderbilt | Andrew Mathias
Related Party Transactions
Due from related party		$ 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%

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Noncontrolling Interests on the Company's Consolidated Financial Statements - Additional Information (Details) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($) shares $ / shares	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) shares
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Redemption and conversion of common units | $		$ (1,536)
Net (loss) income | $	$ (476)	6,202
Accumulated other comprehensive income (loss) allocation | $	2,655	(2,886)
Partnership Interest
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Balance at beginning of period | $	358,262	409,862	$ 409,862
Distributions | $	(4,148)		(12,652)
Issuance of common units | $	4,483		12,018
Redemption and conversion of common units | $	(13,261)		(36,085)
Net (loss) income | $	(476)		20,016
Accumulated other comprehensive income (loss) allocation | $	2,655		(2,299)
Fair value adjustment | $	26,609		(32,598)
Balance at end of period | $	$ 374,124		$ 358,262
SL Green Operating Partnership
Organization
Number of units of operating partnership owned by the noncontrolling interest unit holders (shares)	4,156,282		3,938,823
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares)	4,156,282
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Redemption and conversion of common units | $		(1,536)
Accumulated other comprehensive income (loss) allocation | $	$ 2,655	$ (2,886)
SL Green Operating Partnership | 3.50% Series A
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Dividend rate preferred units (as a percent)	3.50%
Preferred units, shares authorized (in shares)	109,161
Number of preferred units issued (in shares)	109,161
Number of Units Outstanding (in shares)	109,161
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 35.0000
Liquidation preference of preferred units (in dollars per share) | $ / shares	1,000.00
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares	$ 0
Number of company common stock issued on conversion of Series B preferred units	6.71348
SL Green Operating Partnership | Series F
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Dividend rate preferred units (as a percent)	700.00%
Preferred units, shares authorized (in shares)	60
Number of preferred units issued (in shares)	60
Number of Units Outstanding (in shares)	60
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 70.0000
Liquidation preference of preferred units (in dollars per share) | $ / shares	1,000.00
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares	$ 29.12
SL Green Operating Partnership | 4.50% Series G
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Dividend rate preferred units (as a percent)	450.00%
Preferred units, shares authorized (in shares)	1,902,000
Number of preferred units issued (in shares)	1,902,000
Number of Units Outstanding (in shares)	718,697
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 1.1250
Liquidation preference of preferred units (in dollars per share) | $ / shares	25.00
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares	$ 88.50
Number of company common stock issue on redemption of operation partnership common units	1
SL Green Operating Partnership | Series K
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Dividend rate preferred units (as a percent)	350.00%
Preferred units, shares authorized (in shares)	700,000
Number of preferred units issued (in shares)	563,954
Number of Units Outstanding (in shares)	341,677
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 0.8750
Liquidation preference of preferred units (in dollars per share) | $ / shares	25.00
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares	$ 134.67
SL Green Operating Partnership | Series L
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Dividend rate preferred units (as a percent)	400.00%
Preferred units, shares authorized (in shares)	500,000
Number of preferred units issued (in shares)	378,634
Number of Units Outstanding (in shares)	372,634
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 1.0000
Liquidation preference of preferred units (in dollars per share) | $ / shares	25.00
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares	$ 0
SL Green Operating Partnership | Series M
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Dividend rate preferred units (as a percent)	375.00%
Preferred units, shares authorized (in shares)	1,600,000
Number of preferred units issued (in shares)	1,600,000
Number of Units Outstanding (in shares)	96,357
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 0.9375
Liquidation preference of preferred units (in dollars per share) | $ / shares	25.00
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares	$ 0
SL Green Operating Partnership | Series P
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Dividend rate preferred units (as a percent)	400.00%
Preferred units, shares authorized (in shares)	200,000
Number of preferred units issued (in shares)	200,000
Number of Units Outstanding (in shares)	200,000
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 1.0000
Liquidation preference of preferred units (in dollars per share) | $ / shares	25.00
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares	$ 0
SL Green Operating Partnership | Series Q
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Dividend rate preferred units (as a percent)	350.00%
Preferred units, shares authorized (in shares)	268,000
Number of preferred units issued (in shares)	268,000
Number of Units Outstanding (in shares)	268,000
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 0.8750
Liquidation preference of preferred units (in dollars per share) | $ / shares	25.00
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares	$ 148.95
SL Green Operating Partnership | Series R
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Dividend rate preferred units (as a percent)	350.00%
Preferred units, shares authorized (in shares)	400,000
Number of preferred units issued (in shares)	400,000
Number of Units Outstanding (in shares)	400,000
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 0.8750
Liquidation preference of preferred units (in dollars per share) | $ / shares	25.00
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares	$ 154.89
SL Green Operating Partnership | Series S
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Dividend rate preferred units (as a percent)	400.00%
Preferred units, shares authorized (in shares)	1,077,280
Number of preferred units issued (in shares)	1,077,280
Number of Units Outstanding (in shares)	1,077,280
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 1.0000
Liquidation preference of preferred units (in dollars per share) | $ / shares	25.00
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares	$ 0
SL Green Operating Partnership | Series V
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Dividend rate preferred units (as a percent)	350.00%
Preferred units, shares authorized (in shares)	40,000
Number of preferred units issued (in shares)	40,000
Number of Units Outstanding (in shares)	40,000
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 0.8750
Liquidation preference of preferred units (in dollars per share) | $ / shares	25.00
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares	$ 0
SL Green Operating Partnership | Series W
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Preferred units, shares authorized (in shares)	1
Number of preferred units issued (in shares)	1
Number of Units Outstanding (in shares)	1
Preferred stock, dividend, multiplier per common unit distribution	1,350
Operating Partnership | SL Green Operating Partnership
Organization
Noncontrolling interest in the operating partnership (as a percent)	5.65%		5.44%

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Noncontrolling Interests on the Company's Consolidated Financial Statements - Common Unit Activity (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Rollforward Analysis of Preferred Unit Activity
Redemption of preferred units		$ (1,536)
SL Green Operating Partnership
Rollforward Analysis of Preferred Unit Activity
Redemption of preferred units		(1,536)
SL Green Operating Partnership | Preferred Units
Rollforward Analysis of Preferred Unit Activity
Balance at beginning of period	$ 202,169	$ 283,285	$ 283,285
Issuance of preferred units	0		0
Redemption of preferred units	(3,631)		(82,750)
Dividends paid on preferred units	(1,731)		(6,163)
Accrued dividends on preferred units	1,696		7,797
Balance at end of period	$ 198,503		$ 202,169

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Stockholders' Equity of the Company - Additional Information (Details)			3 Months Ended	12 Months Ended
	Jan. 15, 2021 $ / shares	Jan. 08, 2021	Mar. 31, 2021 USD ($) increase $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Jan. 07, 2021 $ / shares	Mar. 31, 2020 shares	Jun. 30, 2018 USD ($)	Aug. 31, 2016 USD ($)
Equity, Class of Treasury Stock [Line Items]
Authorized capital stock (shares) | shares			260,000,000
Authorized shares, par value (in dollars per share) | $ / shares			$ 0.01
Common stock, shares authorized (in shares) | shares			160,000,000	160,000,000
Common stock, par value (in dollars per share) | $ / shares			$ 0.01	$ 0.01
Excess stock, shares authorized (shares) | shares			75,000,000
Excess stock, par value (in dollars per share) | $ / shares			$ 0.01
Preferred stock, shares authorized (shares) | shares			25,000,000
Preferred stock, par value (in dollars per share) | $ / shares			$ 0.01
Excess shares issued (shares) | shares			0
Share repurchased (in shares) | shares			1,306,460	8,529,279	4,465,857	9,468,617	8,105,881
Average price paid per share (in dollars per share) | $ / shares			$ 61.46	$ 62.39	$ 86.06	$ 99.03	$ 104.61
2016 Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount | $				$ 500,000,000.0	$ 500,000,000.0	$ 500,000,000.0	$ 500,000,000.0			$ 500,000,000.0	$ 1,000,000,000.0
Number of increases to share repurchase program | increase			5
Share repurchased (in shares) | shares			31,876,094	30,569,634	22,040,355	17,574,498	8,105,881
Stock repurchase program, authorized amount | $			$ 3,500,000,000
Common Stock
Equity, Class of Treasury Stock [Line Items]
Shares, outstanding (in shares) | shares			69,354,000	68,508,000	76,956,000				74,365,000
Share price (in dollars per share) | $ / shares								$ 58.15
Reverse stock split conversion ratio		1.02918
Common Stock | Cash Dividend
Equity, Class of Treasury Stock [Line Items]
Common stock, dividends, per share, cash paid (in dollars per share) | $ / shares	$ 0.3735
Common stock, dividends, per share, stock paid (in dollars per share) | $ / shares	0.0279
Common Stock | Stock Dividend
Equity, Class of Treasury Stock [Line Items]
Common stock, dividends, per share, stock paid (in dollars per share) | $ / shares	$ 0.0343
SL Green Operating Partnership | Common Stock
Equity, Class of Treasury Stock [Line Items]
Shares, outstanding (in shares) | shares			69,353,606

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Stockholders' Equity of the Company - Perpetual Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended
	Aug. 31, 2012	Mar. 31, 2021	Dec. 31, 2020	Feb. 28, 2018
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 - Schedule of Common Stock Issued and Proceeds Received Dividend Reinvestments (Details) - Dividend Reinvestment and Stock Purchase Plan (DRIP) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Stockholders' Equity
Issuance of common stock (in shares)	5,483	1,727
Dividend reinvestments/stock purchases under the DRSPP	$ 351	$ 166

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Stockholders' Equity of the Company - Earnings per Share (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Basic Earnings:
Income attributable to SL Green common stockholders	$ (7,464)	$ 114,801
Less: distributed earnings allocated to participating securities	(371)	(113)
Less: undistributed earnings allocated to participating securities	0	(464)
Net Income attributable to common unitholders (numerator for basic earnings per unit)	(7,835)	114,224
Effect of Dilutive Securities:
Add back: dilutive effect of earnings allocated to participating securities	371	113
Add back: undistributed earnings allocated to participating securities	0	464
Redemption of units to common shares	(476)	6,202
Diluted Earnings:
Income attributable to SL Green common stockholders	$ (7,940)	$ 121,003
Basic Shares:
Weighted average common shares outstanding (shares)	69,010,000	75,656,000
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares (shares)	4,148,000	4,220,000
Stock-based compensation plans (shares)	595,000	476,000
Contingently issuable shares from special dividend declared December 4, 2020 (in shares)	317,000	0
Diluted weighted average common stock outstanding (shares)	74,070,000	80,352,000
Common stock shares excluded from the diluted shares outstanding (shares)	1,159,343

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Partners' Capital of the Operating Partnership - Additional Information (Details) - shares	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Common Stock
Stockholders' Equity
Units outstanding (units)	69,354,000	68,508,000	74,365,000	76,956,000
SL Green Operating Partnership
Stockholders' Equity
Number of units of operating partnership owned by the noncontrolling interest unit holders (units)	4,156,282	3,938,823
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)	69,353,606

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Partners' Capital of the Operating Partnership - EPS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator
Less: distributed earnings allocated to participating securities	$ (371)	$ (113)
Less: undistributed earnings allocated to participating securities	0	(464)
Net Income attributable to common unitholders (numerator for basic earnings per unit)	(7,835)	114,224
Add back: dilutive effect of earnings allocated to participating securities	(371)	(113)
Add back: undistributed earnings allocated to participating securities	0	(464)
Income attributable to SL Green common stockholders	$ (7,940)	121,003
Denominator
Common stock shares excluded from the diluted shares outstanding (shares)	1,159,343
SL Green Operating Partnership
Numerator
Net income attributable to SLGOP common unitholders	$ (7,940)	121,003
Less: distributed earnings allocated to participating securities	(371)	(113)
Less: undistributed earnings allocated to participating securities	0	(464)
Net Income attributable to common unitholders (numerator for basic earnings per unit)	(8,311)	120,426
Add back: dilutive effect of earnings allocated to participating securities	371	113
Add back: undistributed earnings allocated to participating securities	0	464
Income attributable to SL Green common stockholders	$ (7,940)	$ 121,003
Denominator
Basic weighted average common units outstanding (in shares)	73,158,000	79,876,000
Stock-based compensation plans (shares)	595,000	476,000
Contingently issuable units from special distribution declared December 4, 2020 (in shares)	317,000	0
Diluted weighted average common units outstanding (shares)	74,070,000	80,352,000
Common stock shares excluded from the diluted shares outstanding (shares)	1,159,343	1,170,579

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Share-based Compensation - Additional Information (Details) fungibleUnit in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($) unit / shares fungibleUnit unit shares	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 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	$ 500,000	$ 600,000
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
Options granted (in shares) | shares	0		0
Remaining weighted average contractual life of the options outstanding (in years)	1 year 10 months 24 days
Remaining average contractual life of the options exercisable (in years)	1 year 10 months 24 days
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
Class O LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred unit distributions as a percentage of common unit distributions	10.00%
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 2,067,125		$ 10,895,459
Total unrecognized compensation cost related to unvested stock awards	$ 14,000,000.0
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)	2 years
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	$ 10,900,000		12,500,000
Weighted average fair value of options granted during the period	$ 9,214,531		$ 734,315
Awards granted (in shares) | shares	145,845		8,959
Awards outstanding (in shares) | shares	3,573,082		3,439,674	3,465,347
LTIP units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of options granted during the period	$ 40,300,000		$ 37,000,000.0
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	9,100,000	3,000,000.0
Total unrecognized compensation cost related to unvested stock awards	$ 65,900,000
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)	2 years
All other awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term	10 years
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
Fungible units per share (in fungible units per share) | unit / shares	3.74
Shares that may be issued if equal to fungible units (shares) (less than) | shares	27,030,000
Fungible units | fungibleUnit	1.9
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	$ 0	20,000.00
Total unrecognized compensation cost related to unvested stock awards	$ 0
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
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
Deferred Stock Compensation Plan for Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 1,800,000	$ 1,800,000
Maximum percentage of the annual retainer fee, chairman fees and meeting fees that may be deferred by non-employee directors (percent)	100.00%
Awards granted (in shares) | shares	18,290
Shares issued (in shares) | shares	12,064
Awards outstanding (in shares) | shares	159,066
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	157,576

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Share-based Compensation - Stock Options and Restricted Stock Activity (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Stock options
Options Outstanding
Balance at beginning of period (in shares)	784,995	1,007,665
Granted (in shares)	0	0
Exercised (in shares)	0	0
Lapsed or cancelled (in shares)	(9,716)	(222,670)
Balance at end of period (in shares)	775,279	784,995
Options exercisable at end of period (in shares)	775,278	782,022
Weighted Average Exercise Price
Balance at beginning of year (in dollars per share)	$ 102.62	$ 105.35
Granted (in dollars per share)	0	0
Exercised (in dollars per share)	0	0
Lapsed or cancelled (in dollars per share)	86.13	114.97
Balance at end of period (in dollars per share)	102.83	102.62
Options exercisable at end of period (in dollars per share)	$ 102.83	$ 102.62
Restricted Stock Awards
Options Outstanding
Total fair value of options granted during the period	$ 9,214,531	$ 734,315
Summary of restricted stock
Balance at beginning of year (in shares)	3,439,674	3,465,347
Granted (in shares)	145,845	8,959
Cancelled (in shares)	(12,437)	(34,632)
Balance at end of period (in shares)	3,573,082	3,439,674
Vested during the period (in shares)	117,487	128,891

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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	$ 4,935,795
Other comprehensive income before reclassifications	42,548
Amounts reclassified from accumulated other comprehensive loss	5,802
Ending Balance	4,935,620
Deferred net losses from terminated hedges	(600)	$ (500)
Net unrealized (loss) gain on derivative instruments
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	(57,415)
Other comprehensive income before reclassifications	9,771
Amounts reclassified from accumulated other comprehensive loss	4,196
Ending Balance	(43,448)
Net unrealized gain (loss) on marketable securities
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	1,021
Other comprehensive income before reclassifications	(247)
Amounts reclassified from accumulated other comprehensive loss	0
Ending Balance	774
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	(67,247)
Ending Balance	(18,897)
Joint venture
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	6,349,006
Ending Balance	5,838,595
Joint venture | Net unrealized (loss) gain on derivative instruments
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	(10,853)
Other comprehensive income before reclassifications	33,024
Amounts reclassified from accumulated other comprehensive loss	1,606
Ending Balance	$ 23,777

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Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value of Financial Instruments
Marketable securities	$ 23,784	$ 28,570
Interest rate cap and swap agreements (included in Other assets)	365	28
Debt and preferred equity investments	1,097,202	1,076,542
Equity method investments	3,698,701	3,823,322
Additional amount of financing receivables included in other assets	66,400	66,200
Carrying Value
Fair Value of Financial Instruments
Debt and preferred equity investments	1,097,202	1,076,542
Fixed rate debt	3,932,789	3,135,572
Variable rate debt	1,416,521	1,827,677
Total	5,349,310	4,963,249
Fair Value
Fair Value of Financial Instruments
Marketable securities	23,784	28,570
Total	5,448,603	5,059,815
Estimated fair value of debt and preferred equity investments, low end of range	1,000,000	1,000,000
Estimated fair value of debt and preferred equity investments, high end of range	1,100,000	1,100,000
Level 1
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in Other assets)	0	0
Level 2
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in Other assets)	365	28
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 | Fair Value
Fair Value of Financial Instruments
Fixed rate debt	4,027,789	3,237,075
Variable rate debt	1,420,814	1,822,740
Equity marketable securities | Level 1
Fair Value of Financial Instruments
Marketable securities	0	0
Commercial mortgage-backed securities
Fair Value of Financial Instruments
Marketable securities	23,784	28,570
Commercial mortgage-backed securities | Level 2
Fair Value of Financial Instruments
Marketable securities	23,784	28,570
Joint venture
Fair Value of Financial Instruments
Equity method investments	3,698,701
Accrued Interest Payable And Other
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in Other liabilities)	47,033	61,217
Accrued Interest Payable And Other | Level 1
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in Other liabilities)	0	0
Accrued Interest Payable And Other | Level 2
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in Other liabilities)	47,033	61,217
Accrued Interest Payable And Other | Level 3
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in Other liabilities)	$ 0	$ 0

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Financial Instruments: Derivatives and Hedging (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Financial Instruments: Derivatives and Hedging
Fair Value	$ 365,000		$ 28,000
Gain (loss) from changes in fair value	0	$ 0
Fair value of derivatives in a net liability position	48,300,000
Aggregate termination value	49,000,000.0
Estimated current balance held in accumulated other comprehensive loss to be reclassified into earnings within the next 12 months	16,600,000
Share of joint venture of accumulated other comprehensive loss reclassified into equity in net income from unconsolidated joint ventures within the next 12 months	2,200,000
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)	45,175,000	(52,171,000)
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income	(6,088,000)	(1,436,000)
Interest Rate Swap Expiring August 2021
Financial Instruments: Derivatives and Hedging
Notional Value	$ 350,000,000
Strike Rate	0.544%
Fair Value	$ (472,000)
Interest Rate Cap Expiring November 2021
Financial Instruments: Derivatives and Hedging
Notional Value	$ 111,869,000
Strike Rate	3.50%
Fair Value	$ 0
Interest Rate Cap Expiring December 2021
Financial Instruments: Derivatives and Hedging
Notional Value	$ 510,000,000
Strike Rate	3.00%
Fair Value	$ 0
Interest Rate Swap Expiring February 2022
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000,000
Strike Rate	0.138%
Fair Value	$ (3,000)
Interest Rate Swap Expiring February 2022, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 100,000,000
Strike Rate	0.136%
Fair Value	$ 0
Interest Rate Cap Expiring March 2022
Financial Instruments: Derivatives and Hedging
Notional Value	$ 85,000,000
Strike Rate	4.00%
Fair Value	$ 0
Interest Rate Swap Expiring January 2023
Financial Instruments: Derivatives and Hedging
Notional Value	$ 100,000,000
Strike Rate	0.212%
Fair Value	$ 95,000
Interest Rate Swap Expiring February 2023
Financial Instruments: Derivatives and Hedging
Notional Value	$ 400,000,000
Strike Rate	0.16%
Fair Value	$ 270,000
Interest Rate Swap Expiring in July 2023
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000,000
Strike Rate	1.131%
Fair Value	$ (4,017,000)
Interest Rate Swap Expiring in July 2023, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 100,000,000
Strike Rate	1.161%
Fair Value	$ (2,077,000)
Interest Rate Swap Expiring January 2024
Financial Instruments: Derivatives and Hedging
Notional Value	$ 150,000,000
Strike Rate	2.696%
Fair Value	$ (9,675,000)
Interest Rate Swap Expiring January 2026
Financial Instruments: Derivatives and Hedging
Notional Value	$ 150,000,000
Strike Rate	2.721%
Fair Value	$ (13,117,000)
Interest Rate Swap Expiring January 2026, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000,000
Strike Rate	2.74%
Fair Value	$ (17,672,000)
Interest Rate Contract
Financial Instruments: Derivatives and Hedging
Fair Value	(46,668,000)
Interest Rate Swaps/Caps
Financial Instruments: Derivatives and Hedging
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)	10,220,000	(45,082,000)
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income	(4,388,000)	(725,000)
Joint venture
Financial Instruments: Derivatives and Hedging
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)	34,955,000	(7,089,000)
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income	(1,700,000)	$ (711,000)
Joint venture | Interest Rate Contract
Financial Instruments: Derivatives and Hedging
Fair Value	42,081,000
Joint venture | Interest Rate Swap Expiring February 2026
Financial Instruments: Derivatives and Hedging
Notional Value	$ 177,000,000
Strike Rate	1.669%
Fair Value	$ (6,459,000)
Joint venture | Interest Rate Cap Expiring September 2021
Financial Instruments: Derivatives and Hedging
Notional Value	$ 375,000,000
Strike Rate	2.60%
Fair Value	$ 0
Joint venture | Interest Rate Cap Expiring September 2021, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 20,026,000
Strike Rate	2.60%
Fair Value	$ 0
Joint venture | Interest Rate Cap Expiring August 2022
Financial Instruments: Derivatives and Hedging
Notional Value	$ 198,000,000
Strike Rate	4.00%
Fair Value	$ 2,000
Joint venture | Interest Rate Cap Expiring February 2022
Financial Instruments: Derivatives and Hedging
Notional Value	$ 220,000,000
Strike Rate	4.00%
Fair Value	$ 0
Joint venture | Interest Rate Cap Expiring September 2023
Financial Instruments: Derivatives and Hedging
Notional Value	$ 550,000,000
Strike Rate	3.75%
Fair Value	$ 138,000
Joint venture | Interest Rate Cap Expiring September 2021, 3
Financial Instruments: Derivatives and Hedging
Notional Value	$ 1,075,000,000
Strike Rate	3.75%
Fair Value	$ 0
Joint venture | Interest Rate Cap Expiring September 2021, 4
Financial Instruments: Derivatives and Hedging
Notional Value	$ 125,000,000
Strike Rate	3.75%
Fair Value	$ 0
Joint venture | Interest Rate Cap Expiring October 2024
Financial Instruments: Derivatives and Hedging
Notional Value	$ 1,250,000,000
Strike Rate	1.25%
Fair Value	$ 5,764,000
Joint venture | Interest Rate Cap Expiring January 2023
Financial Instruments: Derivatives and Hedging
Notional Value	$ 23,000,000
Strike Rate	4.75%
Fair Value	$ 1,000
Joint venture | Interest Rate Swap Expiring June 2031
Financial Instruments: Derivatives and Hedging
Notional Value	$ 2,250,000,000
Strike Rate	1.611%
Fair Value	$ 42,635,000

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Lease Income - Lease Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Fixed lease payments	$ 164,679	$ 194,224
Variable lease payments	25,279	27,168
Total lease payments	189,958	221,392
Amortization of acquired above and below-market leases	(1,869)	1,239
Total rental revenue	188,089	222,631
Sublease Income	65,800	66,300
Interest income	$ 1,101	$ 0

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Commitments and Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Operating leases, minimum lease term	1 year
Operating lease, weighted average discount rate, percent	4.52%
Operating lease, weighted average remaining lease term	27 years
Financing leases
Remaining 2021	$ 31,136
2022	3,522
2023	3,570
2024	3,641
2025	3,810
2026	3,858
Thereafter	256,692
Total minimum lease payments	306,229
Amount representing interest	(153,607)
Lease liabilities	152,622	$ 152,521
Operating leases
Remaining 2021	31,954
2022	29,386
2023	29,502
2024	30,545
2025	30,772
2026	30,911
Thereafter	631,532
Total minimum lease payments	814,602
Amount discounted using incremental borrowing rate	(359,217)
Lease liabilities	$ 455,385	$ 339,458
711 Third Avenue
Lessee, Lease, Description [Line Items]
Ownership Interest Disposed	50.00%

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Commitments and Contingencies - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Lease Costs
Operating lease costs before capitalized operating lease costs	$ 7,567	$ 8,113
Operating lease costs capitalized	(828)	(746)
Operating lease costs, net	6,739	7,367
Finance Lease, Costs [Abstract]
Interest on financing leases	1,492	1,663
Interest on financing leases capitalized	0	(747)
Interest on financing leases, net	1,492	916
Finance lease, right-of-use asset, amortization	180	305
Financing lease costs, net	$ 1,672	$ 1,221
Operating lease, weighted average discount rate, percent	4.52%
Operating lease, weighted average remaining lease term	27 years

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Segment Information - Additional Information (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Segment information
Number of reportable segments | segment		2
Total revenues		$ 226,102	$ 314,303
Net (loss) income		(3,855)	127,114
Total assets	[1]	12,044,045		$ 11,707,567
Marketing, general and administrative		22,885	19,570
Operating Segments | Real Estate Segment
Segment information
Total revenues		206,829	275,770
Net (loss) income		(20,027)	111,233
Total assets		10,896,203		10,579,899
Operating Segments | Debt and Preferred Equity Segment
Segment information
Total revenues		19,273	38,533
Net (loss) income		16,172	$ 15,881
Total assets		$ 1,147,842		$ 1,127,668

[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: $179.6 million and $41.2 million of land, $282.3 million and $57.9 million of building and improvements, $2.0 million and $2.0 million of building and leasehold improvements, $53.2 million and $37.8 million of right of use assets, $16.4 million and $10.3 million of accumulated depreciation, $297.1 million and $289.5 million of other assets included in other line items, $368.6 million and $94.0 million of real estate debt, net, $0.9 million and $0.7 million of accrued interest payable, $45.3 million and $29.9 million of lease liabilities, and $31.2 million and $56.6 million of other liabilities included in other line items as of March 31, 2021 and December 31, 2020, respectively.