10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

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

For the Quarterly Period Ended September 30, 2017

o 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: 001-36105

EMPIRE STATE REALTY TRUST, INC.

(Exact name of Registrant as specified in its charter)

Maryland	37-1645259
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

111 West 33rd Street, 12th Floor

New York, New York 10120

(Address of principal executive offices) (Zip Code)

(212) 687-8700

(Registrant's telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes   x    No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x     No   o

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

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

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  o    No  x

Indicate the number of shares outstanding of each of the issuer's classes of common stock, as of the latest practicable date.

Class A Common Stock, par value $0.01 per share	158,616,019
Class B Common Stock, par value $0.01 per share	1,076,990
(Class)	(Outstanding on October 31, 2017)

	EMPIRE STATE REALTY TRUST, INC.
	FORM 10-Q FOR THE QUARTER ENDED SEPTEMBER 30, 2017
	TABLE OF CONTENTS	PAGE
PART 1.	FINANCIAL INFORMATION
ITEM 1.	FINANCIAL STATEMENTS
	Condensed Consolidated Balance Sheets as of September 30, 2017 (unaudited) and December 31, 2016	2
	Condensed Consolidated Statements of Income for the three and nine months ended September 30, 2017 and 2016 (unaudited)	3
	Condensed Consolidated Statements of Comprehensive Income (Loss) for the three and nine months ended September 30, 2017 and 2016 (unaudited)	4
	Condensed Consolidated Statements of Stockholders' Equity for the three and nine months ended September 30, 2017 (unaudited)	5
	Condensed Consolidated Statements of Cash Flows for the three and nine months ended September 30, 2017 and 2016 (unaudited)	6
	Notes to Condensed Consolidated Financial Statements (unaudited)	8
ITEM 2.	MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	30
ITEM 3.	QUANTITATIVE AND QUALITATIVE DISCLOSURE ABOUT MARKET RISK	45
ITEM 4.	CONTROLS AND PROCEDURES	45
PART II.	OTHER INFORMATION	46
ITEM 1.	LEGAL PROCEEDINGS	46
ITEM 1A.	RISK FACTORS	46
ITEM 2.	UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS	46
ITEM 3.	DEFAULTS UPON SENIOR SECURITIES	46
ITEM 4.	MINE SAFETY DISCLOSURES	46
ITEM 5.	OTHER INFORMATION	46
ITEM 6.	EXHIBITS	46
SIGNATURES		47

1

ITEM 1. FINANCIAL STATEMENTS

Empire State Realty Trust, Inc.

Condensed Consolidated Balance Sheets

(amounts in thousands, except share and per share amounts)

	September 30, 2017			December 31, 2016
ASSETS	(unaudited)
Commercial real estate properties, at cost:
Land	$	201,196		$	201,196
Development costs	7,978			7,951
Building and improvements	2,398,964			2,249,482
	2,608,138			2,458,629
Less: accumulated depreciation	(631,916		)	(556,546		)
Commercial real estate properties, net	1,976,222			1,902,083
Cash and cash equivalents	432,105			554,371
Restricted cash	64,020			61,514
Tenant and other receivables, net of allowance of $3,504 and $3,333 in 2017 and 2016, respectively	34,661			22,542
Deferred rent receivables, net of allowance of $187 and $390 in 2017 and 2016, respectively	172,665			152,074
Prepaid expenses and other assets	39,463			53,749
Deferred costs, net	268,132			277,081
Acquired below-market ground leases, net	370,187			376,060
Goodwill	491,479			491,479
Total assets	$	3,848,934		$	3,890,953
LIABILITIES AND EQUITY
Liabilities:
Mortgage notes payable, net	$	720,830		$	759,016
Senior unsecured notes, net	592,914			590,388
Unsecured term loan facility, net	263,546			262,927
Unsecured revolving credit facility	—			—
Accounts payable and accrued expenses	142,690			134,064
Acquired below-market leases, net	70,013			82,300
Deferred revenue and other liabilities	41,320			32,212
Tenants’ security deposits	47,395			47,183
Total liabilities	1,878,708			1,908,090
Commitments and contingencies
Equity:
Empire State Realty Trust, Inc. stockholders' equity:
Preferred stock, $0.01 par value per share, 50,000,000 shares authorized, none issued or outstanding	—			—
Class A common stock, $0.01 par value per share, 400,000,000 shares authorized, 158,349,708 shares issued and outstanding and 154,744,740 shares issued and outstanding in 2017 and 2016, respectively	1,583			1,547
Class B common stock, $0.01 par value per share, 50,000,000 shares authorized, 1,077,740 and 1,095,737 shares issued and outstanding in 2017 and 2016, respectively	11			11
Additional paid-in capital	1,116,026			1,104,463
Accumulated other comprehensive loss	(10,425		)	(2,789		)
Retained earnings	46,436			50,904
Total Empire State Realty Trust, Inc.'s stockholders' equity	1,153,631			1,154,136
Non-controlling interests in operating partnership	808,591			820,723
Private perpetual preferred units, $16.62 per unit liquidation preference, 1,560,360 issued and outstanding in 2017 and 2016	8,004			8,004
Total equity	1,970,226			1,982,863
Total liabilities and equity	$	3,848,934		$	3,890,953

The accompanying notes are an integral part of these financial statements

2

Empire State Realty Trust, Inc.

Condensed Consolidated Statements of Income

(unaudited)

(amounts in thousands, except per share amounts)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Revenues:
Rental revenue	$	122,391		$	115,634		$	360,348		$	343,155
Tenant expense reimbursement	20,346			19,176			53,889			56,350
Observatory revenue	39,306			38,093			94,212			91,112
Third-party management and other fees	345			404			1,088			1,372
Other revenue and fees	4,932			2,541			19,861			6,748
Total revenues	187,320			175,848			529,398			498,737
Operating expenses:
Property operating expenses	41,270			38,585			122,009			115,075
Ground rent expenses	2,331			2,331			6,994			6,994
General and administrative expenses	12,899			11,798			36,566			35,623
Observatory expenses	8,648			7,250			23,079			21,900
Real estate taxes	26,901			24,691			76,001			71,773
Acquisition expenses	—			—			—			98
Depreciation and amortization	38,490			37,607			119,868			115,382
Total operating expenses	130,539			122,262			384,517			366,845
Total operating income	56,781			53,586			144,881			131,892
Other expenses:
Interest expense	(16,890		)	(17,939		)	(52,109		)	(52,758		)
Loss on early extinguishment of debt	(2,157		)	—			(2,157		)	(552		)
Loss from derivative financial instruments	—			—			(289		)	—
Income before income taxes	37,734			35,647			90,326			78,582
Income tax expense	(2,245		)	(2,750		)	(4,333		)	(4,340		)
Net income	35,489			32,897			85,993			74,242
Private perpetual preferred unit distributions	(234		)	(234		)	(702		)	(702		)
Net income attributable to non-controlling interests	(16,449		)	(16,690		)	(39,916		)	(39,050		)
Net income attributable to common stockholders	$	18,806		$	15,973		$	45,375		$	34,490
Total weighted average shares:
Basic	158,102			136,831			157,796			126,740
Diluted	297,871			280,614			298,089			271,028
Earnings per share attributable to common stockholders:
Basic	$	0.12		$	0.12		$	0.29		$	0.27
Diluted	$	0.12		$	0.12		$	0.29		$	0.27
Dividends per share	$	0.105		$	0.105		$	0.315		$	0.295

The accompanying notes are an integral part of these financial statements

3

Empire State Realty Trust, Inc.

Condensed Consolidated Statements of Comprehensive Income (Loss)

(unaudited)

(amounts in thousands)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Net income	$	35,489		$	32,897		$	85,993		$	74,242
Other comprehensive income (loss):
Change in unrealized gain (loss) on valuation of interest rate swap agreements	(1,279		)	930			(14,252		)	(29,305		)
Other comprehensive income (loss)	(1,279		)	930			(14,252		)	(29,305		)
Comprehensive income (loss)	34,210			33,827			71,741			44,937
Net income attributable to non-controlling interests and private perpetual preferred unitholders	(16,683		)	(16,924		)	(40,618		)	(39,752		)
Other comprehensive (income) loss attributable to non-controlling interests	586			(979		)	6,670			15,561
Comprehensive income (loss) attributable to common stockholders	$	18,113		$	15,924		$	37,793		$	20,746

The accompanying notes are an integral part of these financial statements

4

Empire State Realty Trust, Inc.

Condensed Consolidated Statements of Stockholders' Equity

For The Nine Months Ended September 30, 2017

(unaudited)

(amounts in thousands)

	Number of Class A Common Shares	Class A Common Stock		Number of Class B Common Shares		Class B Common Stock		Additional Paid-In Capital		Accumulated Other Comprehensive Income (Loss)			Retained Earnings			Total Stockholders' Equity			Non-controlling Interests			Private Perpetual Preferred Units			Total Equity
Balance at December 31, 2016	154,745	$	1,547	1,096		$	11	$	1,104,463	$	(2,789	)	$	50,904		$	1,154,136		$	820,723		$	8,004		$	1,982,863
Conversion of operating partnership units and Class B shares to Class A shares	3,577	36		(18	)	—		11,087		(54		)	—			11,069			(11,069		)	—			—
Equity compensation:
LTIP units	—	—		—		—		—		—			—			—			10,332			—			10,332
Restricted stock, net of forfeitures	28	—		—		—		476		—			—			476			—			—			476
Dividends and distributions	—	—		—		—		—		—			(49,843		)	(49,843		)	(44,641		)	(702		)	(95,186		)
Net income	—	—		—		—		—		—			45,375			45,375			39,916			702			85,993
Unrealized gain (loss) on valuation of interest rate swap agreements	—	—		—		—		—		(7,582		)	—			(7,582		)	(6,670		)	—			(14,252		)
Balance at September 30, 2017	158,350	$	1,583	1,078		$	11	$	1,116,026	$	(10,425	)	$	46,436		$	1,153,631		$	808,591		$	8,004		$	1,970,226

The accompanying notes are an integral part of these financial statements

5

Empire State Realty Trust, Inc.

Condensed Consolidated Statements of Cash Flows

(unaudited)

(amounts in thousands)

	Nine Months Ended September 30,
	2017			2016
Cash Flows From Operating Activities
Net income	$	85,993		$	74,242
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	119,868			115,382
Amortization of non-cash items within interest expense	919			516
Amortization of acquired above- and below-market leases, net	(4,154		)	(6,285		)
Amortization of acquired below-market ground leases	5,873			5,873
Straight-lining of rental revenue	(20,590		)	(21,495		)
Equity based compensation	10,808			7,254
Settlement of derivative contracts	(6,335		)	—
Loss on early extinguishment of debt	2,157			552
Increase (decrease) in cash flows due to changes in operating assets and liabilities:
Restricted cash	(703		)	3,120
Tenant and other receivables	(12,119		)	(788		)
Deferred leasing costs	(21,660		)	(18,642		)
Prepaid expenses and other assets	13,672			16,775
Accounts payable and accrued expenses	(8,917		)	(7,223		)
Deferred revenue and other liabilities	9,108			(7,213		)
Net cash provided by operating activities	173,920			162,068
Cash Flows From Investing Activities
(Increase) decrease in restricted cash for investing activities	(1,590		)	558
Development costs	(27		)	(450		)
Additions to building and improvements	(157,579		)	(120,401		)
Net cash used in investing activities	(159,196		)	(120,293		)

The accompanying notes are an integral part of these financial statements

6

Empire State Realty Trust, Inc.

Condensed Consolidated Statements of Cash Flows (continued)

(unaudited)

(amounts in thousands)

	Nine Months Ended September 30,
	2017			2016
Cash Flows From Financing Activities
Proceeds from mortgage notes payable	315,000			50,000
Repayment of mortgage notes payable	(344,618		)	(29,220		)
Proceeds from unsecured revolving credit facility and term loan	265,000			50,000
Repayments of unsecured revolving credit facility and term loan	(265,000		)	(90,000		)
Net proceeds from the sale of common stock	—			611,278
Deferred financing costs	(12,186		)	(2,905		)
Private perpetual preferred unit distributions	(702		)	(702		)
Dividends paid to common stockholders	(49,843		)	(39,491		)
Distributions paid to non-controlling interests in the operating partnership	(44,641		)	(43,123		)
Net cash (used in) provided by financing activities	(136,990		)	505,837
Net (decrease) increase in cash and cash equivalents	(122,266		)	547,612
Cash and cash equivalents—beginning of period	554,371			46,685
Cash and cash equivalents—end of period	$	432,105		$	594,297
Supplemental disclosures of cash flow information:
Cash paid for interest	$	53,918		$	53,286
Cash paid for income taxes	$	5,004		$	3,495
Non-cash investing and financing activities:
Building and improvements included in accounts payable and accrued expenses	$	72,130		$	71,444
Derivative instruments at fair values included in accounts payable and accrued expenses	13,378			31,227
Conversion of operating partnership units and Class B shares to Class A shares	11,087			19,941

The accompanying notes are an integral part of these financial statements

7

Empire State Realty Trust, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

1. Description of Business and Organization

As used in these condensed consolidated financial statements, unless the context otherwise requires, “we,” “us,” “our,” the “company,” and "ESRT" mean Empire State Realty Trust, Inc. and its consolidated subsidiaries.

    We are a self-administered and self-managed real estate investment trust ("REIT") that owns, manages, operates, acquires and repositions office and retail properties in Manhattan and the greater New York metropolitan area.

As of September 30, 2017, our total portfolio contained 10.1 million rentable square feet of office and retail space. We owned 14 office properties (including three long-term ground leasehold interests) encompassing approximately 9.4 million rentable square feet of office space. Nine of these properties are located in the midtown Manhattan market and aggregate approximately 7.6 million rentable square feet of office space, including the Empire State Building. Our Manhattan office properties also contain an aggregate of 494,935 rentable square feet of retail space on their ground floor and/or contiguous levels. Our remaining five office properties are located in Fairfield County, Connecticut and Westchester County, New York, encompassing in the aggregate approximately 1.9 million rentable square feet. The majority of square footage for these five properties is located in densely populated metropolitan communities with immediate access to mass transportation. Additionally, we have entitled land at the Stamford Transportation Center in Stamford, Connecticut, adjacent to one of our office properties, that will support the development of an approximately 380,000 rentable square foot office building and garage, which we refer to herein as Metro Tower. As of September 30, 2017, our portfolio included four standalone retail properties located in Manhattan and two standalone retail properties located in the city center of Westport, Connecticut, encompassing 204,450 rentable square feet in the aggregate.

We were organized as a Maryland corporation on July 29, 2011 and commenced operations upon completion of our initial public offering and related formation transactions on October 7, 2013. Our operating partnership, Empire State Realty OP, L.P. (the "Operating Partnership"), holds substantially all of our assets and conducts substantially all of our business. As of September 30, 2017, we owned approximately 53.1% of the aggregate operating partnership units in the Operating Partnership. We, as the sole general partner in the Operating Partnership, have responsibility and discretion in the management and control of the Operating Partnership, and the limited partners in the Operating Partnership, in such capacity, have no authority to transact business for, or participate in the management activities of, the Operating Partnership. Accordingly, the Operating Partnership has been consolidated by us. We elected to be taxed as a REIT and operate in a manner that we believe allows us to qualify as a REIT for federal income tax purposes commencing with our taxable year ended December 31, 2013.

2. Summary of Significant Accounting Policies

There have been no material changes to the summary of significant accounting policies included in the section entitled "Summary of Significant Accounting Policies" in our December 31, 2016 Annual Report on Form 10-K.

Basis of Quarterly Presentation and Principles of Consolidation

The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”), for interim financial information, and with the rules and regulations of the Securities and Exchange Commission (the "SEC"). Accordingly, certain information and footnote disclosures required by GAAP for complete financial statements have been condensed or omitted in accordance with such rules and regulations. In the opinion of management, all adjustments and eliminations (including intercompany balances and transactions), consisting of normal recurring adjustments, considered necessary for the fair presentation of the financial statements have been included.

    The results of operations for the periods presented are not necessarily indicative of the results that may be expected for the corresponding full years. These financial statements should be read in conjunction with the financial statements and accompanying notes included in the financial statements for the year ended December 31, 2016 contained in our Annual Report on Form 10-K. We do not consider our business to be subject to material seasonal fluctuations, except that our observatory business is subject to tourism seasonality. During the past ten years, approximately 16.0% to 18.0% of our annual observatory

8

revenue was realized in the first quarter, 26.0% to 28.0% was realized in the second quarter, 31.0% to 33.0% was realized in the third quarter and 23.0% to 25.0% was realized in the fourth quarter.

We consolidate entities in which we have a controlling financial interest.  In determining whether we have a controlling financial interest in a partially owned entity and the requirement to consolidate the accounts of that entity, we consider factors such as ownership interest, board representation, management representation, authority to make decisions, and contractual and substantive participating rights of the partners/members.  For variable interest entities ("VIE"), we consolidate the entity if we are deemed to have a variable interest in the entity and through that interest we are deemed the primary beneficiary. The primary beneficiary of a VIE 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. The primary beneficiary is required to consolidate the VIE. The Operating Partnership is a variable interest entity of our company, Empire State Realty Trust, Inc.  As the Operating Partnership is already consolidated in the financial statements of Empire State Realty Trust, Inc., the identification of this entity as a variable interest entity has no impact on our consolidated financial statements.

We will assess the accounting treatment for each investment we may have in the future. This assessment will include a review of each entity’s organizational agreement to determine which party has what rights and whether those rights are protective or participating. For all VIEs, we will review such agreements in order to determine which party has the power to direct the activities that most significantly impact the entity’s economic performance and benefit. In situations where we or our partner could approve, among other things, the annual budget, or leases that cover more than a nominal amount of space relative to the total rentable space at each property, we would not consolidate the investment as we consider these to be substantive participation rights that result in shared power of the activities that would most significantly impact the performance and benefit of such joint venture investment.

A non-controlling interest in a consolidated subsidiary is defined as the portion of the equity (net assets) in a subsidiary not attributable, directly or indirectly, to a parent. Non-controlling interests are required to be presented as a separate component of equity in the condensed consolidated balance sheets and in the condensed consolidated statements of income by requiring earnings and other comprehensive income to be attributed to controlling and non-controlling interests.

Accounting Estimates

The preparation of the condensed consolidated financial statements in accordance with GAAP requires management to use estimates and assumptions that in certain circumstances affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities, and the reported revenues and expenses. Significant items subject to such estimates and assumptions include allocation of the purchase price of acquired real estate properties among tangible and intangible assets, determination of the useful life of real estate properties and other long-lived assets, valuation and impairment analysis of commercial real estate properties and other long-lived assets, estimate of tenant expense reimbursements, valuation of the allowance for doubtful accounts, and valuation of derivative instruments, senior unsecured notes, mortgage notes payable, unsecured term loan and revolving credit facilities, and equity based compensation. These estimates are prepared using management’s best judgment, after considering past, current, and expected events and economic conditions. Actual results could differ from those estimates.

Reclassification

Certain prior year balances have been reclassified to conform to our current year presentation. The prior year balance of interest expense has been reclassified to separately present loss on early extinguishment of debt.

Recently Issued or Adopted Accounting Standards

During August 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, which amends its hedge accounting model to enable entities to better portray their risk management activities in the financial statements. The amendments expand an entity’s ability to hedge nonfinancial and financial risk components and reduce complexity in fair value hedges of interest rate risk. ASU No. 2017-12 eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. It also eases certain documentation and assessment requirements and modifies the accounting for components excluded from the assessment of hedge effectiveness. ASU No. 2017-12 will be effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early application is permitted in any interim period. All transition requirements and elections should be applied to hedging relationships existing

9

on the date of adoption. The effect of adoption should be reflected as of the beginning of the fiscal year of adoption (that is, the initial application date). During the quarter, we early adopted ASU No. 2017-02 using a modified retrospective approach for existing and active hedging relationships as of adoption date. The adoption of ASU No. 2017-02 did not have a material impact on our consolidated financial statements.

During January 2017, the FASB issued ASU No. 2017-04, Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment, which contain amendments that modify the concept of impairment from the condition that exists when the carrying amount of goodwill exceeds its implied fair value to the condition that exists when the carrying amount of a reporting unit exceeds its fair value. An entity no longer will determine goodwill impairment by calculating the implied fair value of goodwill by assigning the fair value of a reporting unit to all of its assets and liabilities as if that reporting unit had been acquired in a business combination. Because these amendments eliminate Step 2 from the goodwill impairment test, they should reduce the cost and complexity of evaluating goodwill for impairment. ASU No. 2017-04 should be applied on a prospective basis and the amendments adopted for the annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

During January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business, which contain amendments to clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The amendments in ASU No. 2017-01 provide a screen to determine when an integrated set of assets and activities (collectively referred to as a “set”) is not a business. The screen requires that when substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. This screen reduces the number of transactions that need to be further evaluated. Real estate acquisitions that do not meet the definition of a business will be accounted for as asset acquisitions and the corresponding acquisition costs will be capitalized rather than expensed. These amendments narrow the definition of the term output so that the term is consistent with how outputs are described in Topic 606, Revenue from Contracts with Customers. ASU No. 2017-01 will be effective for annual periods beginning after December 15, 2017, including interim periods within those periods. The amendments should be applied prospectively on or after the effective date. No disclosures are required at transition. We believe that future acquisitions of real estate properties will be considered asset acquisitions.

During November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, which contain amendments that require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. ASU No. 2016-18 will be effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. The amendments should be applied using a retrospective transition method to each period presented. We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

During August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. ASU No. 2016-15 will be effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Earlier adoption is permitted including adoption in an interim period. We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

During June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which contains amendments that replace the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. ASU No. 2016-13 will be effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Earlier adoption as of the fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, is permitted. The amendments must be adopted through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective (that is, a modified retrospective approach). We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

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During February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which requires that a lessee recognize in the statement of financial position a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. ASU No. 2016-02 leaves the accounting for leases by lessors largely unchanged from previous GAAP. ASU No. 2016-02 will be effective for fiscal years beginning after December 15, 2018 and subsequent interim periods. The new standard must be adopted using a modified retrospective transition, and provides for certain practical expedients. Transition will require application of the new guidance at the beginning of the earliest comparative period presented. This ASU is expected to result in the recognition of a right-to-use asset and related liability to account for our future obligations under our ground lease agreements for which we are the lessee. As of September 30, 2017, the remaining contractual payments under our ground lease agreements aggregated $61.7 million. In addition, under ASU 2016-02, lessors may only capitalize incremental direct leasing costs. As a result, we expect that we will no longer capitalize our internal leasing costs and instead will expense these costs as incurred. These costs totaled $2.3 million for the year ended December 31, 2016. We continue to evaluate the impact of adopting this new accounting standard on our consolidated financial statements.

During May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which will replace all current GAAP guidance related to revenue recognition and eliminate all industry-specific guidance. The new revenue recognition standard provides a unified model to determine when and how revenue is recognized. The core principle is that a company should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This guidance can be applied either retrospectively to each period presented or as a cumulative-effect adjustment as of the date of adoption. ASU No. 2014-09 was amended in August 2015 by ASU No. 2015-14 Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, which defers the effective date of ASU No. 2014-09 for all entities by one year. Public business entities, certain not-for-profit entities, and certain employee benefit plans should apply the guidance in ASU No. 2014-09 to annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. Earlier application is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. ASU No. 2014-09 was further amended in December 2016 by ASU No. 2016-20 Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers which contain amendments that are intended to clarify or correct unintended application of the guidance. Those items generally are not expected to have a significant effect on current accounting practice or create a significant administrative cost for most entities. The effective date and transition requirements for the amendments are the same as the effective date and transition requirements for Topic 606. We plan to adopt this standard on the required effective date of January 1, 2018 using the modified retrospective approach and we do not expect the adoption to have a material impact on our consolidated financial statements. This standard excludes from its scope, accounting for leases which is covered by ASU No. 2016-02, Leases. However, the non-lease service components within a lease such as common area maintenance reimbursed by tenants will be considered individual performance obligations and be subject to the new revenue recognition standard, and such revenue will be recognized over the period in which the related services are performed. We expect to apply the new revenue guidance to non-lease components within tenant leases upon our adoption of the lease standard effective January 1, 2019.

3. Deferred Costs, Acquired Lease Intangibles and Goodwill

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

	September 30, 2017			December 31, 2016
Leasing costs	$	158,780		$	140,325
Acquired in-place lease value and deferred leasing costs	244,829			253,113
Acquired above-market leases	70,290			74,770
	473,899			468,208
Less: accumulated amortization	(214,466		)	(195,617		)
Total deferred costs, net, excluding net deferred financing costs	$	259,433		$	272,591

At September 30, 2017 and December 31, 2016, $8.7 million and $4.5 million, respectively, of net deferred financing costs associated with the unsecured revolving credit facility was included in deferred costs, net on the condensed consolidated balance sheet.    

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Amortization expense related to deferred leasing costs and acquired deferred leasing costs was $5.8 million and $6.1 million for the three months ended September 30, 2017 and 2016, respectively, and $17.9 million and $17.6 million for the nine months ended September 30, 2017 and 2016, respectively. Amortization expense related to acquired lease intangibles was $4.0 million and $5.0 million for the three months ended September 30, 2017 and 2016, respectively, and $13.0 million and $19.7 million for the nine months ended September 30, 2017 and 2016, respectively.

Amortizing acquired intangible assets and liabilities consisted of the following as of September 30, 2017 and December 31, 2016 (amounts in thousands):

	September 30, 2017			December 31, 2016
Acquired below-market ground leases	$	396,916		$	396,916
Less: accumulated amortization	(26,729		)	(20,856		)
Acquired below-market ground leases, net	$	370,187		$	376,060

	September 30, 2017			December 31, 2016
Acquired below-market leases	$	(132,723	)	$	(135,026	)
Less: accumulated amortization	62,710			52,726
Acquired below-market leases, net	$	(70,013	)	$	(82,300	)

Rental revenue related to the amortization of below-market leases, net of above-market leases, was $1.6 million and $1.2 million for the three months ended September 30, 2017 and 2016, respectively, and $4.1 million and $6.3 million for the nine months ended September 30, 2017 and 2016, respectively.

As of September 30, 2017, we had goodwill of $491.5 million. Goodwill was allocated $227.5 million to the observatory reportable segment and $264.0 million to the real estate segment.

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4. Debt

Debt consisted of the following as of September 30, 2017 and December 31, 2016 (amounts in thousands):

	Principal Balance						As of September 30, 2017
	September 30, 2017			December 31, 2016			Stated Rate		Effective Rate(1)		Maturity Date(2)
Mortgage debt collateralized by:
Fixed rate mortgage debt
1333 Broadway	$	66,872		$	67,656		6.32	%	3.73	%	1/5/2018
1400 Broadway
(first lien mortgage loan)	66,909			67,714			6.12	%	3.37	%	2/5/2018
(second lien mortgage loan)	9,226			9,389			3.35	%	3.36	%	2/5/2018
111 West 33rd Street
(first lien mortgage loan)	74,356			75,261			6.01	%	3.32	%	4/5/2018
(second lien mortgage loan)	9,405			9,509			6.56	%	3.62	%	4/5/2018
1350 Broadway	37,302			37,764			5.87	%	3.71	%	4/5/2018
Metro Center	94,464			95,985			3.59	%	3.66	%	11/5/2024
10 Union Square	50,000			50,000			3.70	%	3.97	%	4/1/2026
1542 Third Avenue	30,000			17,795			4.29	%	4.68	%	5/1/2027
First Stamford Place(3)	180,000			235,067			4.28	%	4.67	%	7/1/2027
1010 Third Avenue and 77 West 55th Street	39,885			26,502			4.01	%	4.45	%	1/5/2028
10 Bank Street	34,802			31,544			4.23	%	4.54	%	6/1/2032
383 Main Avenue	30,000			28,654			4.44	%	4.77	%	6/30/2032
Total mortgage debt	723,221			752,840
Senior unsecured notes - exchangeable	250,000			250,000			2.63	%	3.93	%	8/15/2019
Senior unsecured notes:(6)
Series A	100,000			100,000			3.93	%	4.00	%	3/27/2025
Series B	125,000			125,000			4.09	%	4.17	%	3/27/2027
Series C	125,000			125,000			4.18	%	4.26	%	3/27/2030
Unsecured revolving credit facility(6)	—			—			(4)		(4)		8/29/2021
Unsecured term loan facility(6)	265,000			265,000			(5)		(5)		8/29/2022
Total principal	1,588,221			1,617,840
Unamortized premiums, net of unamortized discount	(2,301		)	905
Deferred financing costs, net	(8,630		)	(6,414		)
Total	$	1,577,290		$	1,612,331

______________

(1) The effective rate is the yield as of September 30, 2017, including the effects of debt issuance costs and the amortization of the fair value of debt adjustment.

(2) Pre-payment is generally allowed for each loan upon payment of a customary pre-payment penalty.

(3) Represents a $164 million mortgage loan bearing interest of 4.09% and a $16 million loan bearing interest at 6.25%.

(4) At September 30, 2017, the unsecured revolving credit facility bears a floating rate at 30 day LIBOR plus 1.10%. The rate at September 30, 2017 was 2.33%.

(5) The unsecured term loan facility bears a floating rate at 30 day LIBOR plus 1.20%. Pursuant to a forward interest rate swap agreement, the LIBOR rate is fixed at 2.1485% for the period beginning on August 31, 2017 through maturity. The rate at September 30, 2017 was 3.35%.

(6) At September 30, 2017, we were in compliance with all debt covenants.

Mortgage Debt

During April 2017, we refinanced a mortgage loan collateralized by 1542 Third Avenue. The new $30.0 million loan bears interest at a fixed rate of 4.29% and matures in May 2027.

During May 2017, we refinanced a mortgage loan collateralized by 10 Bank Street. The new $35.0 million loan bears interest at a fixed rate of 4.23% and matures in June 2032.

During June 2017, we refinanced a mortgage loan collateralized by First Stamford Place. The new $180.0 million loans bear a blended interest rate of 4.28% and mature in July 2027. One mortgage loan is for $164.0 million and bears an interest rate of 4.09%. The second loan is for $16.0 million and bears an interest rate of 6.25%.

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During June 2017, we refinanced a mortgage loan collateralized by 1010 Third Avenue and 77 West 55th Street. The new $40.0 million loan bears interest at a fixed rate of 4.01% and matures in January 2028.

During June 2017, we refinanced a mortgage loan collateralized by 383 Main Avenue. The new $30.0 million loan bears interest at a fixed rate of 4.44% and matures in June 2032.

Principal Payments

Aggregate required principal payments at September 30, 2017 are as follows (amounts in thousands):

Year	Amortization		Maturities		Total
2017	$	1,983	$	—	$	1,983
2018	4,417		262,210		266,627
2019	3,790		250,000		253,790
2020	3,938		—		3,938
2021	4,090		—		4,090
Thereafter	43,407		1,014,386		1,057,793
Total	$	61,625	$	1,526,596	$	1,588,221

Deferred Financing Costs

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

	September 30, 2017			December 31, 2016
Financing costs	$	23,333		$	23,145
Less: accumulated amortization	(6,004		)	(12,241		)
Total deferred financing costs, net	$	17,329		$	10,904

At September 30, 2017 and December 31, 2016, $8.7 million and $4.5 million, respectively, of net deferred financing costs associated with the unsecured revolving credit facility was included in deferred costs, net on the condensed consolidated balance sheet.

Amortization expense related to deferred financing costs was $1.0 million and $1.3 million for the three months ended September 30, 2017 and 2016, respectively, and $3.6 million and $3.7 million for the nine months ended September 30, 2017 and 2016, respectively, and was included in interest expense.

Unsecured Revolving Credit and Term Loan Facility

During August 2017, through the Operating Partnership, we entered into an amended and restated senior unsecured revolving credit and term loan facility (the “Facility”) with Bank of America, N.A., as administrative agent, Merrill Lynch, Pierce, Fenner & Smith Incorporated and Wells Fargo Securities, LLC as Joint Lead Arrangers and Joint Bookrunners, Wells Fargo, National Association and Capital One, National Association, as co-syndication agents, and the lenders party thereto. The Facility amended and restated the credit facility dated as of January 23, 2015, with Bank of America, N.A., Merrill Lynch, Goldman Sachs and the other lenders party thereto. In connection with the modification of the credit facility and term loan, we incurred a loss on early extinguishment of debt of $2.2 million which is reflected in our condensed consolidated statement of income for the nine months ended September 30, 2017. This transaction extended the unsecured revolving credit facility maturity, lowered borrowing costs and added flexibility to the financial covenants.

The Facility is in the original principal amount of up to $1.365 billion, which consists of a $1.1 billion revolving credit facility and a $265 million term loan facility. The new revolving credit facility replaced a credit facility which was due to mature in January 2019 and was undrawn as of September 30, 2017. The term loan facility was borrowed in full at closing and used to repay a $265 million term loan that had been due in 2022. We may request the Facility be increased through one or more increases in the revolving credit facility or one or more increases in the term loan facility or the addition of new pari passu term loan tranches, for a maximum aggregate principal amount not to exceed $1.75 billion.

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The initial maturity of the unsecured revolving credit facility is August 2021. We have the option to extend the initial term for up to two additional 6-month periods, subject to certain conditions, including the payment of an extension fee equal to 0.0625% and 0.075% of the then outstanding commitments under the unsecured revolving credit facility on the first and the second extensions, respectively. The term loan facility matures on August 2022. We may prepay the loans under the Facility at any time, subject to reimbursement of the lenders’ breakage and redeployment costs in the case of prepayment of Eurodollar Rate borrowings.

Exchangeable Senior Notes

Issued in August 2014, the $250.0 million2.625% Exchangeable Senior Notes (“2.625% Exchangeable Senior Notes”) are due August 15, 2019. The 2.625% Exchangeable Senior Notes will be exchangeable into cash, shares of Class A common stock or a combination of cash and shares of Class A common stock, at our election. We have asserted that it is our intent and ability to settle the principal amount of the 2.625% Exchangeable Senior Notes in cash. As of September 30, 2017, the exchange rate of the 2.625% Exchangeable Senior Notes was 51.7101 shares per $1,000 principal amount of notes (equivalent to an initial exchange price of approximately $19.34 per share of Class A common stock), subject to adjustment, as described in the related indenture governing the 2.625% Exchangeable Senior Notes.

For the three and nine months endedSeptember 30, 2017, total interest expense related to the 2.625% Exchangeable Senior Notes was $2.4 million and $7.3 million, respectively, consisting of (i) the contractual interest expense of $1.6 million and $4.9 million, respectively, (ii) the additional non-cash interest expense of $0.7 million and $2.0 million, respectively, relating to the accretion of the debt discount, and (iii) the amortization of deferred financing costs of $0.1 million and $0.4 million, respectively. For the three and nine months endedSeptember 30, 2016, total interest expense related to the 2.625% Exchangeable Senior Notes was $2.4 million and $7.3 million, respectively, consisting of (i) the contractual interest expense of $1.6 million and $4.9 million, respectively, (ii) the additional non-cash interest expense of $0.7 million and $2.0 million, respectively, relating to the accretion of the debt discount, and (iii) the amortization of deferred financing costs of $0.1 million and $0.4 million, respectively.

5. Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses consist of the following as of September 30, 2017 and December 31, 2016 (amounts in thousands):

	September 30, 2017		December 31, 2016
Accounts payable and accrued expenses	$	106,420	$	102,866
Payable to the estate of Leona M. Helmsley (1)	18,367		18,367
Interest rate swap agreements liability	13,378		5,591
Accrued interest payable	3,903		6,230
Due to affiliated companies	622		1,010
Accounts payable and accrued expenses	$	142,690	$	134,064

___________

(1) Reflects a payable to the estate of Leona M. Helmsley, as required under our formation agreements, for New York City transfer taxes which would have been payable in absence of the estate's exemption from such tax. The taxing authority's final approval of such exemption was issued during the three months ended September 30, 2017, and upon receipt of the confirming documents we made this payment to the estate of Leona M. Helmsley on October 2, 2017.

6. Financial Instruments and Fair Values

Derivative Financial Instruments

We use derivative financial instruments primarily to manage interest rate risk and such derivatives are not considered speculative. These derivative instruments are typically in the form of interest rate swap and forward agreements and the primary objective is to minimize interest rate risks associated with investing and financing activities. The counterparties of these arrangements are major financial institutions with which we may also have other financial relationships. We are exposed to credit risk in the event of non-performance by these counterparties; however, we currently do not anticipate that any of the counterparties will fail to meet their obligations.

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We have agreements with our derivative counterparties that contain a provision where if we either default or are capable of being declared in default on any of our indebtedness, then we could also be declared in default on our derivative obligations. As of September 30, 2017, the fair value of derivatives in a net liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was $13.4 million. If we had breached any of these provisions at September 30, 2017, we could have been required to settle our obligations under the agreements at their termination value of $13.4 million.

As of September 30, 2017, we had interest rate LIBOR swaps with an aggregate notional value of $790.0 million. The notional value does not represent exposure to credit, interest rate or market risks. As of September 30, 2017, the fair value of these derivative instruments amounted to ($13.4 million) which is included in accounts payable and accrued expenses on the condensed consolidated balance sheet. As of December 31, 2016, the fair value of these derivative instruments amounted to $0.6 million which was included in prepaid expenses and other assets and ($5.6 million) which was included in accounts payable and accrued expenses on the condensed consolidated balance sheet. These interest rate swaps have been designated as cash flow hedges and hedge the future cash outflows on our mortgage debt and also on our term loan facility that is subject to a floating interest rate. As of September 30, 2017 and 2016, these cash flow hedges are deemed highly effective and a net unrealized gain (loss) of $(1.6) million and $0.9 million for the three months ended September 30, 2017 and 2016, respectively, and a net unrealized gain (loss) of $(14.7) million and $(29.3) million for the nine months ended September 30, 2017 and 2016, respectively, are reflected in the condensed consolidated statements of comprehensive income (loss). Amounts reported in accumulated other comprehensive income (loss) related to derivatives will be reclassified to interest expense as interest payments are made on the debt. We estimate that $2.9 million of the current balance held in accumulated other comprehensive income (loss) will be reclassified into interest expense within the next 12 months relating to the interest rate swap contracts in effect as of September 30, 2017.

The table below summarizes the terms of agreements and the fair values of our derivative financial instruments as of September 30, 2017 and December 31, 2016 (dollar amounts in thousands):     

							September 30, 2017					December 31, 2016
Derivative	Notional Amount		Receive Rate	Pay Rate	Effective Date	Expiration Date	Asset		Liability			Asset		Liability
Interest rate swap	$	265,000	1 Month LIBOR	2.1485%	August 31, 2017	August 24, 2022	$	—	$	(3,436	)	$	—	$	(1,634	)
Interest rate swap (1)	100,000		3 Month LIBOR	2.5050%	July 5, 2017	July 5, 2027	—		—			—		(684		)
Interest rate swap (1) (2)	80,000		3 Month LIBOR	2.5050%	July 5, 2017	July 5, 2027	—		—			—		(685		)
Interest rate swap	100,000		3 Month LIBOR	2.4860%	January 5, 2018	January 5, 2028	—		(1,448		)	224		—
Interest rate swap	100,000		3 Month LIBOR	2.4860%	January 5, 2018	January 5, 2028	—		(1,448		)	223		—
Interest rate swap	75,000		3 Month LIBOR	2.4860%	January 5, 2018	January 5, 2028	—		(1,086		)	167		—
Interest rate swap	75,000		3 Month LIBOR	2.7620%	June 1, 2018	June 1, 2028	—		(2,592		)	—		(1,295		)
Interest rate swap	75,000		3 Month LIBOR	2.7620%	June 1, 2018	June 1, 2028	—		(2,591		)	—		(1,293		)
Interest rate swap	100,000		3 Month LIBOR	2.4625%	June 1, 2018	June 1, 2028	—		(777		)	—		—
							$	—	$	(13,378	)	$	614	$	(5,591	)

(1) During June 2017, these swaps aggregating $180.0 million were terminated in connection with the refinancing of several of our mortgage debt (see Note 4 Debt). As of September 30, 2017, the deferred net losses from these terminated hedges amounted to $5.9 million which is included in accumulated other comprehensive loss relating to net unrealized loss from derivative financial instruments.

(2) During March 2017, $20.0 million of an original notional amount of $100.0 million was terminated. In connection with the partial termination and re-designation of the related cash flow hedges, $0.3 million is recognized as a loss from derivative financial instruments and included in Other Expenses on the condensed consolidated statement of income for the nine months ended September 30, 2017. There was no loss from derivative financial instruments for the three months ended September 30, 2017 and for the three and nine months ended September 30, 2016.

The table below shows the effect of our derivative financial instruments designated as cash flow hedges on accumulated other comprehensive income (loss) for the three and nine months endedSeptember 30, 2017 and 2016 (amounts in

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thousands):    

	Three Months Ended					Nine Months Ended
Effects of Cash Flow Hedges	September 30, 2017			September 30, 2016		September 30, 2017			September 30, 2016
Amount of gain (loss) recognized in other comprehensive income (loss)	$	(1,638	)	$	930	$	(14,654	)	$	(29,305	)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense	(359		)	—		(402		)	—

The table below shows the effect of our derivative financial instruments designated as cash flow hedges on the condensed consolidated income statements for the three and nine months endedSeptember 30, 2017 and 2016 (amounts in thousands):

	Three Months Ended						Nine Months Ended
Effects of Cash Flow Hedges	September 30, 2017			September 30, 2016			September 30, 2017			September 30, 2016
Total interest (expense) presented in the condensed consolidated income statements in which the effects of cash flow hedges are recorded	$	(16,890	)	$	(17,939	)	$	(52,109	)	$	(52,758	)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense	(359		)	—			(402		)	—

Fair Valuation

The estimated fair values at September 30, 2017 and December 31, 2016 were determined by management, using available market information and appropriate valuation methodologies. Considerable judgment is necessary to interpret market data and develop estimated fair value. Accordingly, the estimates presented herein are not necessarily indicative of the amounts we could realize on disposition of the financial instruments. The use of different market assumptions and/or estimation methodologies may have a material effect on the estimated fair value amounts.

The fair value of our senior unsecured notes - Exchangeable was derived from quoted prices in active markets and is classified as Level 2 since trading volumes are low.

The fair value of derivative instruments is determined using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. Although the majority of the inputs used to value our derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with our derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by ourselves and our counterparties. The impact of such credit valuation adjustments, determined based on the fair value of each individual contract, was not significant to the overall valuation. As a result, all of our derivatives were classified as Level 2 of the fair value hierarchy.

The fair value of our mortgage notes payable, senior unsecured notes - Series A, B and C, and unsecured term loan facility which are determined using Level 3 inputs, are estimated by discounting the future cash flows using current interest rates at which similar borrowings could be made to us.

The following tables summarize the carrying and estimated fair values of our financial instruments as of September 30, 2017 and December 31, 2016 (amounts in thousands):

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	September 30, 2017
			Estimated Fair Value
	Carrying Value		Total		Level 1		Level 2		Level 3
Interest rate swaps included in prepaid expenses and other assets	$	—	$	—	$	—	$	—	$	—
Interest rate swaps included in accounts payable and accrued expenses	13,378		13,378		—		13,378		—
Mortgage notes payable	720,830		712,365		—		—		712,365
Senior unsecured notes - Exchangeable	243,923		281,068		—		281,068		—
Senior unsecured notes - Series A, B, and C	348,991		344,267		—		—		344,267
Unsecured term loan facility	263,546		265,000		—		—		265,000

	December 31, 2016
			Estimated Fair Value
	Carrying Value		Total		Level 1		Level 2		Level 3
Interest rate swaps included in prepaid expenses and other assets	$	614	$	614	$	—	$	614	$	—
Interest rate swaps included in accounts payable and accrued expenses	5,591		5,591		—		5,591		—
Mortgage notes payable	759,016		755,640		—		—		755,640
Senior unsecured notes - Exchangeable	241,474		282,435		—		282,435		—
Senior unsecured notes - Series A, B, and C	348,914		339,274		—		—		339,274
Unsecured term loan facility	262,927		265,000		—		—		265,000

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

7. Rental Income

We lease various office spaces to tenants over terms ranging from one to 16 years. Certain leases have renewal options for additional terms. The leases provide for base monthly rentals and reimbursements for real estate taxes, escalations linked to the consumer price index or common area maintenance known as operating expense escalation. Operating expense reimbursements are reflected in our condensed consolidated statements of income as tenant expense reimbursement.

8. Commitments and Contingencies

Legal Proceedings

Except as described below, as of September 30, 2017, we were not involved in any material litigation, nor, to our knowledge, was any material litigation threatened against us or our properties, other than routine litigation arising in the ordinary course of business such as disputes with tenants. We believe that the costs and related liabilities, if any, which may result from such actions will not materially affect our condensed consolidated financial position, operating results or liquidity.

As previously disclosed, on or about October 14, 2014, 12 former investors in Empire State Building Associates L.L.C. (“ESBA”), which prior to the initial public offering of our company, (the "Offering"), owned the fee title to the Empire State Building, filed an arbitration with the American Arbitration Association against Peter L. Malkin, Anthony E. Malkin, Thomas N. Keltner, Jr., and our subsidiary ESRT MH Holdings LLC, the former supervisor of ESBA, as respondents. The statement of claim alleges breach of fiduciary duty and related claims in connection with the Offering and formation transactions. These investors had opted out of a prior class action brought regarding the Offering and formation transactions that was settled with court approval. The statement of claim in the arbitration seeks monetary damages and declaratory relief. The respondents filed an answering statement and counterclaims. On December 18, 2014, these claimants also filed a complaint in the United States District Court for the Southern District of New York alleging the same claims that they asserted

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in the arbitration. As alleged in the complaint, the claimants filed this lawsuit to toll the statute of limitations on their claims in the event it is determined that the claims are not subject to arbitration, and they planned to move to stay the lawsuit in favor of the pending arbitration. On February 2, 2015, the claimants filed an amended complaint adding an additional claim and making other non-substantive modifications to the original complaint. On March 12, 2015, the court stayed the action on consent of all parties pending the arbitration. The arbitration hearings commenced in May 2016 and have proceeded for a select number of hearing sessions since that time. Additional hearing sessions are scheduled to resume in November and December 2017.

The respondents believe the allegations in the arbitration are entirely without merit, and they intend to defend them vigorously.

    In connection with the Offering and formation transactions, we entered into indemnification agreements with our directors, executive officers and chairman emeritus, providing for the indemnification by us for certain liabilities and expenses incurred as a result of actions brought, or threatened to be brought, against them. As a result, Anthony E. Malkin, Peter L. Malkin and Thomas N. Keltner, Jr. have defense and indemnity rights from us with respect to the above-referenced arbitration.

Unfunded Capital Expenditures

At September 30, 2017, we estimate that we will incur approximately $78.2 million of capital expenditures (including tenant improvements and leasing commissions) on our properties pursuant to existing lease agreements. We expect to fund these capital expenditures with operating cash flow, additional property level mortgage financings, our unsecured credit facility, cash on hand and other borrowings. Future property acquisitions may require substantial capital investments for refurbishment and leasing costs. We expect that these financing requirements will be met in a similar fashion.

Ground Leases

Aggregate required payments on ground leases at September 30, 2017 were as follows (amounts in thousands):

2017	$	380
2018	1,518
2019	1,518
2020	1,518
2021	1,518
Thereafter	55,212
	$	61,664

Concentration of Credit Risk

Financial instruments that subject us to credit risk consist primarily of cash and cash equivalents, restricted cash, tenant and other receivables and deferred rent receivables. At September 30, 2017, we held on deposit at various major financial institutions cash and cash equivalents and restricted cash balances in excess of amounts insured by the Federal Deposit Insurance Corporation.

Asset Retirement Obligations

We are required to accrue costs that we are legally obligated to incur on retirement of our properties which result from acquisition, construction, development and/or normal operation of such properties. Retirement includes sale, abandonment or disposal of a property. Under that standard, a conditional asset retirement obligation represents a legal obligation to perform an asset retirement activity in which the timing and/or method of settlement is conditional on a future event that may or may not be within a company’s control and a liability for a conditional asset retirement obligation must be recorded if the fair value of the obligation can be reasonably estimated. Environmental site assessments and investigations have identified asbestos or asbestos-containing building materials in certain of our properties. As of September 30, 2017, management has no plans to remove or alter these properties in a manner that would trigger federal and other applicable regulations for asbestos removal, and accordingly, the obligations to remove the asbestos or asbestos-containing building materials from these properties have indeterminable settlement dates. As such, we are unable to reasonably estimate the fair value of the associated conditional asset retirement obligation. However, ongoing asbestos abatement, maintenance programs and other required documentation are carried out as required and related costs are expensed as incurred.

Other Environmental Matters

Certain of our properties have been inspected for soil contamination due to pollutants, which may have occurred prior to our ownership of these properties or subsequently in connection with its development and/or its use. Required remediation to

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such properties has been completed, and as of September 30, 2017, management believes that there are no obligations related to environmental remediation other than maintaining the affected sites in conformity with the relevant authority’s mandates and filing the required documents. All such maintenance costs are expensed as incurred. We expect that resolution of the environmental matters relating to the above will not have a material impact on our business, assets, consolidated financial condition, results of operations or liquidity. However, we cannot be certain that we have identified all environmental liabilities at our properties, that all necessary remediation actions have been or will be undertaken at our properties or that we will be indemnified, in full or at all, in the event that such environmental liabilities arise.

Insurance Coverage

We carry insurance coverage on our properties of types and in amounts with deductibles that we believe are in line with coverage customarily obtained by owners of similar properties.

9. Equity

During 2016, Q REIT Holding LLC, a Qatar Financial Centre limited liability company and a wholly owned

subsidiary of the Qatar Investment Authority, a governmental authority of the State of Qatar (“QREIT”, together with any eligible transferee, “QIA”) purchased 29,610,854 newly issued Class A common shares at $21.00 per share, equivalent to a 9.9% economic interest in us on a fully diluted basis (representing a 19.4% ownership of Class A common shares). However, QIA can only vote shares equivalent to 9.9% of all voting securities, with the balance of their shares to be voted by us in accord with the votes of all other voting securities. We received approximately $621.8 million in gross proceeds from the sale. QIA has a top-up right to acquire a pro rata number of additional shares from us in the future should we issue new shares to third parties.

In connection with the share issuance to QIA, we agreed, subject to certain minimum thresholds and conditions, to indemnify QIA for certain applicable U.S. federal and state taxes paid by QIA in connection with any dividends we pay that are attributable to capital gains from the sale or exchange of any U.S. real property interests. If we were to trigger our tax indemnification obligations under this agreement, we would be required to pay QIA for the resulting tax consequences, as applicable.

Shares and Units

An operating partnership unit of the Operating Partnership ("OP Unit") and a share of our common stock have essentially the same economic characteristics as they receive the same per unit profit distributions of the Operating Partnership. On the one-year anniversary of issuance, an OP Unit may be tendered for redemption for cash; however, we have sole and absolute discretion, and sufficient authorized common stock, to exchange OP Units for shares of common stock on a one-for-one basis instead of cash.

Long-term incentive plan ("LTIP") units are a special class of partnership interests in the Operating Partnership. Each LTIP unit awarded will be deemed equivalent to an award of one share of stock under the First Amended and Restated Empire State Realty Trust, Inc. and Empire State Realty OP, L.P. 2013 Equity Incentive Plan ("2013 Plan"), reducing the availability for other equity awards on a one-for-one basis. The vesting period for LTIP units, if any, will be determined at the time of issuance. Under the terms of the LTIP units, the Operating Partnership will revalue for tax purposes its assets upon the occurrence of certain specified events, and any increase in valuation from the time of grant until such event will be allocated first to the holders of LTIP units to equalize the capital accounts of such holders with the capital accounts of OP unitholders. Subject to any agreed upon exceptions, once vested and having achieved parity with OP unitholders, LTIP units are convertible into OP Units in the Operating Partnership on a one-for-one basis.

With the exception of performance based LTIP units granted in 2016 and 2017, all LTIP units issued in connection with annual equity awards, whether vested or not, receive the same per unit distributions as OP units, which equal per share dividends (both regular and special) on our common stock. Performance based LTIP units granted in 2016 and 2017 receive 10% of such distributions currently, unless and until such LTIP units are earned based on performance, at which time they will receive the accrued and unpaid 90% and will commence receiving 100% of such distributions thereafter.

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The following is net income attributable to common stockholders and the issuance of our Class A shares in exchange for the conversion of OP Units into common stock (amounts in thousands):

	Three Months Ended				Nine Months Ended
	September 30, 2017		September 30, 2016		September 30, 2017		September 30, 2016
Net income attributable to common stockholders	$	18,806	$	15,973	$	45,375	$	34,490
Increase in additional paid-in capital for the conversion of OP Units into common stock	1,953		5,016		11,087		20,217
Change from net income attributable to common stockholders and transfers from non-controlling interests	$	20,759	$	20,989	$	56,462	$	54,707

As of September 30, 2017, there were 300,416,821 OP Units outstanding, of which 159,427,448, or 53.1%, were owned by us and 140,989,373, or 46.9%, were owned by other partners, including certain directors, officers and other members of executive management.

Dividends and Distributions

Total dividends paid to common stockholders were $16.7 million and $49.8 million for the three and nine months ended September 30, 2017, respectively, and $16.2 million and $39.5 million for the three and nine months ended September 30, 2016, respectively. Total distributions paid to OP unitholders, excluding inter-company distributions, were $14.8 million and $44.6 million for the three and nine months ended September 30, 2017, respectively, and $15.1 million and $43.1 million for the three and nine months ended September 30, 2016, respectively. Total distributions paid to preferred unitholders were $0.2 million and $0.7 million for the three and nine months ended September 30, 2017, respectively, and $0.2 million and $0.7 million for the three and nine months ended September 30, 2016, respectively.

Incentive and Share-Based Compensation

The 2013 Plan provides for grants to directors, employees and consultants consisting of stock options, restricted stock, dividend equivalents, stock payments, performance shares, LTIP units, stock appreciation rights and other incentive awards. An aggregate of 12.2 million shares of our common stock is authorized for issuance under awards granted pursuant to the 2013 Plan, and as of September 30, 2017, 7.0 million shares of common stock remain available for future issuance.

In March 2017, we made grants of LTIP units to executive officers under the 2013 Plan. At such time, we granted to executive officers a total of 313,275 LTIP units that are subject to time-based vesting and 865,742 LTIP units that are subject to performance-based vesting, with fair market values of $6.1 million for the time-based vesting awards and $9.6 million for the performance-based vesting awards. In March 2017, we made grants of LTIP units and restricted stock to certain other employees under the 2013 Plan. At such time, we granted to certain other employees a total of 47,993 LTIP units and 34,407 shares of restricted stock that are subject to time-based vesting and 95,156 LTIP units that are subject to performance-based vesting, with fair market values of $1.6 million for the time-based vesting awards and $1.0 million for the performance-based vesting awards. The awards subject to time-based vesting vest ratably over four years from January 1, 2017, subject generally to the grantee's continued employment. The first installment vests on January 1, 2018 and the remainder will vest thereafter in three equal annual installments. The vesting of the LTIP units subject to performance-based vesting is based on the achievement of absolute and relative total stockholder return hurdles over a three-year performance period, commencing on January 1, 2017. Following the completion of the three-year performance period, our compensation committee will determine the number of LTIP units to which the grantee is entitled based on our performance relative to the performance hurdles set forth in the LTIP unit award agreements the grantee entered into in connection with the award grant. These units then vest in two installments, with the first installment vesting on January 1, 2020 and the second installment vesting on January 1, 2021, subject generally to the grantee's continued employment on those dates.

In May 2017, we made grants of LTIP units to our non-employee directors under the 2013 Plan. At such time, we granted a total of 50,408 LTIP units that are subject to time-based vesting with fair market values of $1.0 million. The awards vest ratably over three years from the date of the grant, subject generally to the director's continued service on our Board of Directors.

In February 2016, we made grants of LTIP units to executive officers under the 2013 Plan. At such time, we granted to executive officers a total of 368,225 LTIP units that are subject to time-based vesting and 1,230,228 LTIP units that are subject to performance-based vesting, with fair market values of $5.6 million for the time-based vesting awards and $8.8 million for

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the performance-based vesting awards. In February 2016, we made grants of LTIP units and restricted stock to certain other employees under the 2013 Plan. At such time, we granted to certain other employees a total of 47,168 LTIP units and 44,198 shares of restricted stock that are subject to time-based vesting and 112,925 LTIP units that are subject to performance-based vesting, with fair market values of $1.4 million for the time-based vesting awards and $0.8 million for the performance-based vesting awards. The awards subject to time-based vesting vest ratably over four years from January 1, 2016, subject generally to the grantee's continued employment. The first installment vested on January 1, 2017 and the remainder will vest thereafter in three equal annual installments. The vesting of the LTIP units subject to performance-based vesting is based on the achievement of absolute and relative total stockholder return hurdles over a three-year performance period, commencing on January 1, 2016. Following the completion of the three-year performance period, our compensation committee will determine the number of LTIP units to which the grantee is entitled based on our performance relative to the performance hurdles set forth in the LTIP unit award agreements the grantee entered into in connection with the award grant. These units then vest in two installments, with the first installment vesting on January 1, 2019 and the second installment vesting on January 1, 2020, subject generally to the grantee's continued employment on those dates.

In February 2016, we made a grant of LTIP units to an executive officer under the 2013 Plan. We granted a total of 62,814 LTIP units with a fair market value of $1.0 million. The award is subject to time-based vesting of 30% after three years, 30% after four years, and 40% after five years, subject to the grantee's continued employment.

In June 2016, we made grants of LTIP units to our non-employee directors under the 2013 Plan. At such time, we granted a total of 43,257 LTIP units that are subject to time-based vesting with fair market values of $0.8 million. The awards vest ratably over three years from the date of the grant, subject generally to the director's continued service on our Board of Directors.

We made other grants during 2016 under the 2013 Plan with fair market values of $0.1 million in the aggregate.

Share-based compensation is measured at the fair value of the award on the date of grant and recognized as an expense on a straight-line basis over the vesting period. For the performance-based LTIP units and restricted stock awards, the fair value of the awards was estimated using a Monte Carlo Simulation model.  Our stock price, along with the prices of the comparative indexes, is assumed to follow the Geometric Brownian Motion Process.  Geometric Brownian Motion is a common assumption when modeling in financial markets, as it allows the modeled quantity (in this case the stock price) to vary randomly from its current value and take any value greater than zero.  The volatilities of the returns on our stock price and the comparative indexes were estimated based on implied volatilities and historical volatilities using a six-year look-back period.  The expected growth rate of the stock prices over the performance period is determined with consideration of the risk free rate as of the grant date.  For LTIP unit awards that are time-based, the fair value of the awards was estimated based on the fair value of our stock at the grant date discounted for the restriction period during which the LTIP units cannot be redeemed or transferred and the uncertainty regarding if, and when, the book capital account of the LTIP units will equal that of the common units.  For restricted stock awards that are time-based, we estimate the stock compensation expense based on the fair value of the stock at the grant date.

LTIP units and restricted stock issued during the nine months endedSeptember 30, 2017 and 2016 were valued at $19.4 million and $18.4 million, respectively. The weighted-average per unit or share fair value was $13.77 and $9.60 for grants issued in 2017 and 2016, respectively. The per unit or share granted in 2017 was estimated on the respective dates of grant using the following assumptions: an expected life of 2.8 years, a dividend rate of 2.05%, a risk-free interest rate of 1.55%, and an expected price volatility of 20.0%. The per unit or share granted in 2016 was estimated on the respective dates of grant using the following assumptions: an expected life of 2.8 years, a dividend rate of 2.10%, a risk-free interest rate of 0.84% and an expected price volatility of 24.0%.

No other stock options, dividend equivalents, or stock appreciation rights were issued or outstanding in 2017.

The following is a summary of restricted stock and LTIP unit activity for the nine months endedSeptember 30, 2017:

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	Restricted Stock		LTIP Units		Weighted Average Grant Fair Value
Unvested balance at December 31, 2016	107,793		2,881,629		$	10.01
Vested	(17,923	)	(323,982	)	13.74
Granted	34,407		1,372,574		13.77
Forfeited or unearned	(2,509	)	(77,227	)	5.36
Unvested balance at September 30, 2017	121,768		3,852,994		$	11.11

The LTIP unit and restricted stock awards will immediately vest upon the later of (i) the date the grantee attains the age of 60 and (ii) the date on which grantee has first completed ten years of continuous service with our company or its affiliates. For award agreements that qualify, we recognize noncash compensation expense on the grant date for the time-based awards and ratably over the vesting period for the performance-based awards, and accordingly, we recognized $0.2 million and $0.9 million for the three and nine months ended September 30, 2017, respectively, and $0.1 million and $0.6 million for the three and nine months ended September 30, 2016, respectively. Unrecognized compensation expense was $0.9 million at September 30, 2017, which will be recognized over a weighted average period of 2.4 years.

For the remainder of the LTIP unit and restricted stock awards, we recognize noncash compensation expense ratably over the vesting period, and accordingly, we recognized noncash compensation expense of $3.7 million and $9.9 million for the three and nine months endedSeptember 30, 2017, respectively, and $2.5 million and $6.7 million for the three and nine months ended September 30, 2016, respectively. Unrecognized compensation expense was $26.5 million at September 30, 2017, which will be recognized over a weighted average period of 2.5 years.

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Earnings Per Share

Earnings per share for the three and nine months ended September 30, 2017 and 2016 is computed as follows (amounts in thousands, except per share amounts):

	Three Months Ended,						Nine Months Ended,
	September 30, 2017			September 30, 2016			September 30, 2017			September 30, 2016
Numerator - Basic:
Net income	$	35,489		$	32,897		$	85,993		$	74,242
Private perpetual preferred unit distributions	(234		)	(234		)	(702		)	(702		)
Net income attributable to non-controlling interests	(16,449		)	(16,690		)	(39,916		)	(39,050		)
Earnings allocated to unvested shares	(11		)	(11		)	(28		)	(27		)
Net income attributable to common stockholders - basic	$	18,795		$	15,962		$	45,347		$	34,463
Numerator - Diluted:
Net income	$	35,489		$	32,897		$	85,993		$	74,242
Private perpetual preferred unit distributions	(234		)	(234		)	(702		)	(702		)
Earnings allocated to unvested shares	(11		)	(11		)	(28		)	(27		)
Net income attributable to common stockholders - diluted	$	35,244		$	32,652		$	85,263		$	73,513
Denominator:
Weighted average shares outstanding - basic	158,102			136,831			157,796			126,740
Operating partnership units	138,287			141,908			138,593			143,648
Effect of dilutive securities:
Stock-based compensation plans	762			1,090			848			378
Exchangeable senior notes	720			785			852			262
Weighted average shares outstanding - diluted	297,871			280,614			298,089			271,028
Earnings per share:
Basic	$	0.12		$	0.12		$	0.29		$	0.27
Diluted	$	0.12		$	0.12		$	0.29		$	0.27

There were 954,533 and 840,092 antidilutive shares and LTIP units for the three and nine months ended September 30, 2017, respectively, and 1,033,044 and 757,119 antidilutive shares and LTIP units for the three and nine months ended September 30, 2016, respectively.

10. Related Party Transactions

Supervisory Fee Revenue

We earned supervisory fees from entities affiliated with Anthony E. Malkin, our Chairman and Chief Executive Officer, of $0.3 million and $0.3 million for the three months ended September 30, 2017 and 2016, respectively, and $0.9 million and $1.1 million for the nine months ended September 30, 2017 and 2016, respectively. These fees are included within third-party management and other fees.

Property Management Fee Revenue

We earned property management fees from entities affiliated with Anthony E. Malkin of $0.1 million and $0.1 million for the three months ended September 30, 2017 and 2016, respectively, and $0.2 million and $0.3 million for the nine months ended September 30, 2017 and 2016, respectively. These fees are included within third-party management and other fees.

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Other

We were reimbursed at allocable cost for 647 square feet of shared office space, equipment, and administrative support, as was done prior to our formation, and we received rent generally at market rental rate for 3,074 square feet of leased space, from entities affiliated with Anthony E. Malkin, at one of our properties aggregating $0.07 million and $0.2 million for the three and nine months ended September 30, 2016, respectively.

During August 2016, such entities moved from the previously shared office and leased spaces to relocate to a new 5,351 square foot leased space at one of our properties, paying rent generally at a market rental rate. Under such new lease, the tenant has the right to cancel such lease without special payment on 90 days’ notice. We now have a shared use agreement with such tenant, to occupy a portion of the leased premises as the office location for Peter L. Malkin, our chairman emeritus and employee, utilizing approximately 15% of the space, for which we pay an allocable pro rata share of the cost to such tenant. We also have agreements with these entities to provide them with general computer-related support. Total revenue aggregated $0.1 million and $0.3 million for the three and nine months ended September 30, 2017, respectively.

One of our directors, James D. Robinson IV, is a general partner in an investment fund, which owns more than a 10% economic and voting interest in one of our tenants, OnDeck Capital, with an annualized rent of $5.8 million and $5.7 million as of September 30, 2017 and 2016, respectively.

11. Segment Reporting

We have identified two reportable segments: (1) real estate and (2) observatory. Our real estate segment includes all activities related to the ownership, management, operation, acquisition, redevelopment, repositioning and disposition of our real estate assets. Our observatory segment includes the operation of the 86th and 102nd floor observatories at the Empire State Building. These two lines of businesses are managed separately because each business requires different support infrastructures, provides different services and has dissimilar economic characteristics such as investments needed, stream of revenues and marketing strategies. We account for intersegment sales and rent as if the sales or rent were to third parties, that is, at current market prices.

The following tables provide components of segment profit for each segment for the three and nine months endedSeptember 30, 2017 and 2016 (amounts in thousands):

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	Three Months Ended September 30, 2017
	Real Estate			Observatory			Intersegment Elimination			Total
Revenues:
Rental revenue	$	122,391		$	—		$	—		$	122,391
Intercompany rental revenue	23,301			—			(23,301		)	—
Tenant expense reimbursement	20,346			—			—			20,346
Observatory revenue	—			39,306			—			39,306
Third-party management and other fees	345			—			—			345
Other revenue and fees	4,932			—			—			4,932
Total revenues	171,315			39,306			(23,301		)	187,320
Operating expenses:
Property operating expenses	41,270			—			—			41,270
Intercompany rent expense	—			23,301			(23,301		)	—
Ground rent expense	2,331			—			—			2,331
General and administrative expenses	12,899			—			—			12,899
Observatory expenses	—			8,648			—			8,648
Real estate taxes	26,901			—			—			26,901
Depreciation and amortization	38,473			17			—			38,490
Total operating expenses	121,874			31,966			(23,301		)	130,539
Total operating income	49,441			7,340			—			56,781
Other expenses:
Interest expense	(16,890		)	—			—			(16,890		)
Loss on early extinguishment of debt	(2,157		)	—			—			(2,157		)
Loss from derivative financial instruments	—			—			—			—
Income before income taxes	30,394			7,340			—			37,734
Income tax expense	(264		)	(1,981		)	—			(2,245		)
Net income	$	30,130		$	5,359		$	—		$	35,489
Segment assets	$	3,582,935		$	265,999		$	—		$	3,848,934
Expenditures for segment assets	$	40,320		$	13,411		$	—		$	53,731

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	Three Months Ended September 30, 2016
	Real Estate			Observatory			Intersegment Elimination			Total
Revenues:
Rental revenue	$	115,634		$	—		$	—		$	115,634
Intercompany rental revenue	22,983			—			(22,983		)	—
Tenant expense reimbursement	19,176			—			—			19,176
Observatory revenue	—			38,093			—			38,093
Third-party management and other fees	404			—			—			404
Other revenue and fees	2,536			5			—			2,541
Total revenues	160,733			38,098			(22,983		)	175,848
Operating expenses:
Property operating expenses	38,585			—			—			38,585
Intercompany rent expense	—			22,983			(22,983		)	—
Ground rent expense	2,331			—			—			2,331
General and administrative expenses	11,798			—			—			11,798
Observatory expenses	—			7,250			—			7,250
Real estate taxes	24,691			—			—			24,691
Acquisition expenses	—			—			—			—
Depreciation and amortization	37,421			186			—			37,607
Total operating expenses	114,826			30,419			(22,983		)	122,262
Total operating income	45,907			7,679			—			53,586
Other expenses:
Interest expense	(17,939		)	—			—			(17,939		)
Loss on early extinguishment of debt	—			—			—			—
Loss from derivative financial instruments	—			—			—			—
Income before income taxes	27,968			7,679			—			35,647
Income tax expense	(332		)	(2,418		)	—			(2,750		)
Net income	$	27,636		$	5,261		$	—		$	32,897
Segment assets	$	3,636,262		$	246,307		$	—		$	3,882,569
Expenditures for segment assets	$	52,828		$	—		$	—		$	52,828

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	Nine Months Ended September 30, 2017
	Real Estate			Observatory			Intersegment Elimination			Total
Revenues:
Rental revenue	$	360,348		$	—		$	—		$	360,348
Intercompany rental revenue	57,354			—			(57,354		)	—
Tenant expense reimbursement	53,889			—			—			53,889
Observatory revenue	—			94,212			—			94,212
Third-party management and other fees	1,088			—			—			1,088
Other revenue and fees	19,861			—			—			19,861
Total revenues	492,540			94,212			(57,354		)	529,398
Operating expenses:
Property operating expenses	122,009			—			—			122,009
Intercompany rent expense	—			57,354			(57,354		)	—
Ground rent expense	6,994			—			—			6,994
General and administrative expenses	36,566			—			—			36,566
Observatory expenses	—			23,079			—			23,079
Real estate taxes	76,001			—			—			76,001
Acquisition expenses	—			—			—			—
Depreciation and amortization	119,764			104			—			119,868
Total operating expenses	361,334			80,537			(57,354		)	384,517
Total operating income	131,206			13,675			—			144,881
Other expenses:
Interest expense	(52,109		)	—			—			(52,109		)
Loss on early extinguishment of debt	(2,157		)	—			—			(2,157		)
Loss from derivative financial instruments	(289		)	—			—			(289		)
Income before income taxes	76,651			13,675			—			90,326
Income tax expense	(960		)	(3,373		)	—			(4,333		)
Net income	$	75,691		$	10,302		$	—		$	85,993
Expenditures for segment assets	$	142,854		$	20,261		$	—		$	163,115

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	Nine Months Ended September 30, 2016
	Real Estate			Observatory			Intersegment Elimination			Total
Revenues:
Rental revenue	$	343,155		$	—		$	—		$	343,155
Intercompany rental revenue	55,189			—			(55,189		)	—
Tenant expense reimbursement	56,350			—			—			56,350
Observatory revenue	—			91,112			—			91,112
Third-party management and other fees	1,372			—			—			1,372
Other revenue and fees	6,738			10			—			6,748
Total revenues	462,804			91,122			(55,189		)	498,737
Operating expenses:
Property operating expenses	115,075			—			—			115,075
Intercompany rent expense	—			55,189			(55,189		)	—
Ground rent expense	6,994			—			—			6,994
General and administrative expenses	35,623			—			—			35,623
Observatory expenses	—			21,900			—			21,900
Real estate taxes	71,773			—			—			71,773
Acquisition expenses	98			—			—			98
Depreciation and amortization	115,002			380			—			115,382
Total operating expenses	344,565			77,469			(55,189		)	366,845
Total operating income	118,239			13,653			—			131,892
Other expenses:
Interest expense	(52,758		)	—			—			(52,758		)
Loss on early extinguishment of debt	(552		)	—			—			(552		)
Loss from derivative financial instruments	—			—			—			—
Income before income taxes	64,929			13,653			—			78,582
Income tax expense	(1,018		)	(3,322		)	—			(4,340		)
Net income	$	63,911		$	10,331		$	—		$	74,242
Expenditures for segment assets	$	140,052		$	47		$	—		$	140,099

12. Subsequent Events

None.

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

Unless the context otherwise requires or indicates, references in this section to “we,” “our,” and “us” refer to our company and its consolidated subsidiaries. The following discussion related to our consolidated financial statements should be read in conjunction with the financial statements and the notes thereto appearing elsewhere in this Quarterly Report on Form 10-Q and in our Annual Report on Form 10-K for the year ended December 31, 2016.

FORWARD-LOOKING STATEMENTS

This Quarterly Report on Form 10-Q contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act"), and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). We intend these forward-looking statements to be covered by the safe harbor provisions for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995 and are including this statement for purposes of complying with those safe harbor provisions. You can identify forward-looking statements by the use of forward-looking terminology such as “believes,” “expects,” “may,” “will,” “should,” “seeks,” “approximately,” “intends,” “plans,” “estimates,” “contemplates,” “aims,” “continues,” “would” or “anticipates” or the negative of these words and phrases or similar words or phrases. In particular, statements pertaining to our capital resources, portfolio performance, dividend policy and results of operations contain forward-looking statements. Likewise, all of our statements regarding anticipated growth in our portfolio from operations, acquisitions and anticipated market conditions, demographics and results of operations are forward-looking statements.

Forward-looking statements are subject to substantial risks and uncertainties, many of which are difficult to predict and are generally beyond our control, and you should not rely on them as predictions of future events. Forward-looking statements depend on assumptions, data or methods which may be incorrect or imprecise, and we may not be able to realize them. We do not guarantee that the transactions and events described will happen as described (or that they will happen at all).

The following factors, among others, could cause actual results and future events to differ materially from those set forth or contemplated in the forward-looking statements:

• changes in our industry, the real estate markets, either nationally or in Manhattan or the greater New York metropolitan area;

• resolution of legal proceedings involving the company;

• reduced demand for office or retail space;

• fluctuations in attendance at the observatory;

• new office or observatory development in our market;

• general volatility of the capital and credit markets and the market price of our Class A common stock and our publicly-traded OP Units;

• changes in our business strategy;

• changes in technology and market competition, which affect utilization of our broadcast or other facilities;

• changes in domestic or international tourism, including geopolitical events and currency exchange rates;

• defaults on, early terminations of, or non-renewal of leases by tenants;

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

• fluctuations in interest rates;

• increased operating costs;

• declining real estate valuations and impairment charges;

• termination or expiration of our ground leases;

• availability, terms and deployment of capital;

• our failure to obtain necessary outside financing, including our unsecured revolving credit facility;

• our leverage;

• decreased rental rates or increased vacancy rates;

• our failure to generate sufficient cash flows to service our outstanding indebtedness;

• our failure to redevelop and reposition properties, or to execute any newly planned capital project, successfully or on the anticipated timeline or at the anticipated costs;

• difficulties in identifying properties to acquire and completing acquisitions;

• risks of real estate development (including our Metro Tower development site) and capital projects, including the cost of construction delays and cost overruns;

• inability to manage our properties and our growth effectively;

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• inability to make distributions to our securityholders in the future;

• impact of changes in governmental regulations, tax law and rates and similar matters;

• failure to continue to qualify as a real estate investment trust, or REIT;

• a future terrorist event in the U.S.;

• environmental uncertainties and risks related to adverse weather conditions and natural disasters;

• lack, or insufficient amounts, of insurance;

• misunderstanding of our competition;

• changes in real estate and zoning laws and increases in real property tax rates;

• inability to comply with the laws, rules and regulations applicable to similar companies;

• risks associated with security breaches through cyberattacks, cyber intrusions or otherwise, as well as other significant disruptions of our technology (IT) networks related systems, which support our operations and our buildings; and

• other factors discussed under “Item 1A, Risk Factors” of our Annual Report on Form 10-K for the year ended December 31, 2016 and additional factors that may be contained in any filing we make with the SEC, including Part II, Item 1A of our Quarterly Reports on Form 10-Q.

While forward-looking statements reflect our good faith beliefs, they are not guarantees of future performance. We disclaim any obligation to publicly update or revise any forward-looking statement to reflect changes in underlying assumptions or factors, of new information, data or methods, future events or other changes after the date of this Quarterly Report on Form 10-Q, except as required by applicable law. The risks set forth above are not exhaustive. For a further discussion of these and other factors that could impact our future results, performance or transactions, see the sections entitled “Risk Factors" in our Annual Report on Form 10-K for the year ended December 31, 2016 which we filed with the SEC. You should not place undue reliance on any forward-looking statements, which are based only on information currently available to us.    

Overview

We are a self-administered and self-managed real estate investment trust ("REIT") that owns, manages, operates, acquires and repositions office and retail properties in Manhattan and the greater New York metropolitan area.

Highlights for the three months ended September 30, 2017 included:

• Achieved net income attributable to the Company of $18.8 million and Core Funds From Operations of $77.5 million.

• Occupancy and leased percentages at September 30, 2017:

• Total portfolio was 89.8% occupied; including signed leases not commenced (“SLNC”), the total portfolio was 91.7% leased.

• Manhattan office portfolio (excluding the retail component of these properties) was 89.1% occupied; including SLNC, the Manhattan office portfolio was 91.5% leased.

• Retail portfolio was 94.1% occupied; including SLNC, the retail portfolio was 94.1% leased.

• Empire State Building was 93.3% occupied; including SLNC, was 93.5% leased.

• Signed 34 leases, representing 487,854 rentable square feet across the total portfolio, achieving a portfolio-wide 27.7% increase in mark-to-market rent over previous fully escalated rents on new, renewal, and expansion leases.

• Signed 13 new leases representing 276,964 rentable square feet for the Manhattan office portfolio (excluding the retail component of these properties), achieving an increase of 46.1% in mark-to-market rent over previous fully escalated rents.

• The Empire State Building Observatory revenue for the third quarter 2017 grew 3.1% to $39.3 million from $38.1 million in the third quarter 2016.

• Recast our $1.1 billion undrawn, unsecured revolving credit facility and $265 million term loan and extended the revolving credit facility maturity, lowered the borrowing costs and added flexibility to the financial covenants.

• Declared a dividend in the amount of $0.105 per share.

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As of September 30, 2017, our total portfolio contained 10.1 million rentable square feet of office and retail space. We owned 14 office properties (including three long-term ground leasehold interests) encompassing approximately 9.4 million rentable square feet of office space. Nine of these properties are located in the midtown Manhattan market and aggregate approximately 7.6 million rentable square feet of office space, including the Empire State Building. Our Manhattan office properties also contain an aggregate of 494,935 rentable square feet of premier retail space on their ground floor and/or contiguous levels. Our remaining five office properties are located in Fairfield County, Connecticut and Westchester County, New York, encompassing in the aggregate approximately 1.9 million rentable square feet. The majority of square footage for these five properties is located in densely populated metropolitan communities with immediate access to mass transportation. Additionally, we have entitled land at the Stamford Transportation Center in Stamford, Connecticut, adjacent to one of our office properties, that will support the development of an approximately 380,000 rentable square foot office building and garage, which we refer to herein as Metro Tower. As of September 30, 2017, our portfolio included four standalone retail properties located in Manhattan and two standalone retail properties located in the city center of Westport, Connecticut, encompassing 204,450 rentable square feet in the aggregate.

The Empire State Building is our flagship property. The Empire State Building provides us with a diverse source of revenue through its office and retail leases, observatory operations and broadcasting licenses and related leased space. Our observatory operations are a separate reporting segment. Our observatory operations are subject to regular patterns of tourist activity in Manhattan. During the past ten years, approximately 16.0% to 18.0% of our annual observatory revenue was realized in the first quarter, 26.0% to 28.0% was realized in the second quarter, 31.0% to 33.0% was realized in the third quarter, and 23.0% to 25.0% was realized in the fourth quarter.

The components of the Empire State Building revenue are as follows (dollars in thousands):

	Nine Months Ended September 30,
	2017				2016
Office leases	$	94,320	40.5	%	$	89,026	38.9	%
Retail leases	5,554		2.4	%	7,223		3.2	%
Tenant reimbursements & other income	19,354		8.3	%	18,530		8.1	%
Observatory operations	94,212		40.4	%	91,112		39.8	%
Broadcasting licenses and leases	19,654		8.4	%	22,771		10.0	%
Total	$	233,094	100.0	%	$	228,662	100.0	%

We have been undertaking a comprehensive redevelopment and repositioning strategy of our Manhattan office properties. This strategy is designed to improve the overall value and attractiveness of our properties and has contributed significantly to our tenant repositioning efforts, which seek to increase our occupancy; raise our rental rates; increase our rentable square feet; increase our aggregate rental revenue; lengthen our average lease term; increase our average lease size; and improve our tenant credit quality. These improvements include restored, renovated and upgraded or new lobbies; elevator modernization; renovated public areas and bathrooms; refurbished or new windows; upgrade and standardization of retail storefront and signage; façade restorations; modernization of building-wide systems; and enhanced tenant amenities. We have also aggregated smaller spaces in order to offer larger blocks of office space, including multiple floors, that are attractive to larger, higher credit-quality tenants and to offer new, pre-built suites with improved layouts. This strategy has shown what we believe to be attractive results to date, and we believe has the potential to improve our operating margins and cash flows in the future. We believe we will continue to enhance our tenant base and improve rents as our pre-redevelopment leases continue to expire and be re-leased. From 2002 through September 30, 2017, we have invested a total of approximately $783.0 million (excluding tenant improvement costs and leasing commissions) in our Manhattan office properties pursuant to this program. We intend to fund these capital improvements through a combination of operating cash flow, cash on hand, and borrowings.

During the second quarter 2017, we commenced a multi-year capital project at the Empire State Building which we believe will improve the experience for office tenants and their visitors and Observatory visitors, and increase the value of our 34th Street retail space. In the first phase, we will relocate the present Observatory entrance, now located on Fifth Avenue, to a new, larger, designated entrance at the western side of the Empire State Building on 34th Street. The new Observatory entrance will provide a separate dedicated entrance for Observatory visitors. The new entrance will eliminate Observatory visitors from entering the Fifth Avenue lobby, thereby reducing Observatory traffic in the Fifth Avenue lobby by approximately 50% and restore better access to the Fifth Avenue lobby to our office tenants and their visitors. We believe the new entrance will increase the value of all of our 34th Street facing retail space, enhance the Observatory visitor experience, and increase Observatory revenue per capita.

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We continue to anticipate that we will invest approximately $40 million to $50 million annually over three years to complete this project. Expenditures were $13.4 million for the three months ended September 30, 2017 and $20.3 million for the nine months ended September 30, 2017. We do not expect a disruption to Observatory operations or the visitor experience during the project. Our objective is to create long-term value for shareholders, and this investment is an outcome of continually looking at ways to innovate and enhance the office and retail tenant and visitor experience at the Empire State Building.

As of September 30, 2017, excluding principal amortization, we had no debt maturing in 2017 and approximately $262.2 million of debt maturing in 2018, and we had total debt outstanding of approximately $1.6 billion, with a weighted average interest rate of 4.05% (excluding premiums and discount) and a weighted average maturity of 6.2 years. As of September 30, 2017, we had cash and cash equivalents of $432.1 million. Our consolidated net debt to total market capitalization was approximately 15.7% as of September 30, 2017.

Results of Operations

Overview

The discussion below relates to our financial condition and results of operations for the three and nine months ended September 30, 2017 and 2016, respectively.

Three Months Ended September 30, 2017 Compared to the Three Months Ended September 30, 2016

The following table summarizes our historical results of operations for the three months ended September 30, 2017 and 2016 (dollars in thousands):

	Three Months Ended September 30,
	2017			2016			Change			%
Revenues:
Rental revenue	$	122,391		$	115,634		$	6,757		5.8	%
Tenant expense reimbursement	20,346			19,176			1,170			6.1	%
Observatory revenue	39,306			38,093			1,213			3.2	%
Third-party management and other fees	345			404			(59		)	(14.6	)%
Other revenues and fees	4,932			2,541			2,391			94.1	%
Total revenues	187,320			175,848			11,472			6.5	%
Operating expenses:
Property operating expenses	41,270			38,585			2,685			7.0	%
Ground rent expenses	2,331			2,331			—			—	%
General and administrative expenses	12,899			11,798			1,101			9.3	%
Observatory expenses	8,648			7,250			1,398			19.3	%
Real estate taxes	26,901			24,691			2,210			9.0	%
Depreciation and amortization	38,490			37,607			883			2.3	%
Total operating expenses	130,539			122,262			8,277			6.8	%
Operating income	56,781			53,586			3,195			6.0	%
Other expenses:
Interest expense	(16,890		)	(17,939		)	1,049			5.8	%
Loss on early extinguishment of debt	(2,157		)	—			(2,157		)	—	%
Loss from derivative financial instruments	—			—			—			—	%
Income before income taxes	37,734			35,647			2,087			5.9	%
Income tax expense	(2,245		)	(2,750		)	505			18.4	%
Net income	35,489			32,897			2,592			7.9	%
Private perpetual preferred unit distributions	(234		)	(234		)	—			—	%
Net income attributable to non-controlling interests	(16,449		)	(16,690		)	241			1.4	%
Net income attributable to common stockholders	$	18,806		$	15,973		$	2,833		17.7	%

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Rental Revenue

The increase in rental income was primarily attributable to increased rental rates and higher occupancy.

Tenant Expense Reimbursement

The increase in tenant expense reimbursements was due to higher property operating expenses and real estate tax expense.

Observatory Revenue

Observatory revenues were higher primarily due to an improvement in our ticket mix and higher per person average ticket price.

Third-Party Management and Other Fees

The decrease reflects lower management fee income due to the wind-down of activities in certain managed entities.

Other Revenues and Fees

The increase in other revenues and fees was primarily due to higher lease cancellation income of $1.0 million, a real estate tax refund of $0.4 million, higher interest income of $0.7 million and insurance claim reimbursements of $0.4 million for the three months ended September 30, 2017.

Property Operating Expenses

The increase in property operating expenses was primarily due to higher payroll costs.

Ground Rent Expenses

Ground rent expense was consistent with 2016.

General and Administrative Expenses

The increase in general and administrative expenses was primarily due to increased equity compensation expense and higher legal professional fees for the three months ended September 30, 2017.

Observatory Expenses

The increase in Observatory expenses primarily reflect a combination of higher payroll estimates and timing pertaining to certain repair and maintenance costs for the three months ended September 30, 2017.

Real Estate Taxes

The increase in real estate taxes was primarily due to higher assessed values for several properties.

Depreciation and Amortization

The increase in depreciation and amortization was primarily attributable to assets that were placed in service towards the end of 2016 and hence, subject to a full quarter's depreciation for the three months ended September 30, 2017.

Interest Expense

Interest expense declined due to lower interest rates on new mortgage loan refinancings.

Loss on Early Extinguishment of Debt

The loss on early extinguishment of debt reflects deferred financing costs written off in connection with the modification of the unsecured revolving credit and term loan facility in August 2017.

Income Taxes

The decrease in income tax expense was attributable to activities within our taxable REIT subsidiaries, primarily related to our Observatory operations.

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Nine Months Ended September 30, 2017 Compared to the Nine Months Ended September 30, 2016

The following table summarizes our historical results of operations for the nine months ended September 30, 2017 and 2016 (dollars in thousands):

	Nine Months Ended September 30,
	2017			2016			Change			%
Revenues:
Rental revenue	$	360,348		$	343,155		$	17,193		5.0	%
Tenant expense reimbursement	53,889			56,350			(2,461		)	(4.4	)%
Observatory revenue	94,212			91,112			3,100			3.4	%
Third-party management and other fees	1,088			1,372			(284		)	(20.7	)%
Other revenues and fees	19,861			6,748			13,113			194.3	%
Total revenues	529,398			498,737			30,661			6.1	%
Operating expenses:
Property operating expenses	122,009			115,075			6,934			6.0	%
Ground rent expenses	6,994			6,994			—			—	%
General and administrative expenses	36,566			35,623			943			2.6	%
Observatory expenses	23,079			21,900			1,179			5.4	%
Real estate taxes	76,001			71,773			4,228			5.9	%
Acquisition expenses	—			98			(98		)	(100.0	)%
Depreciation and amortization	119,868			115,382			4,486			3.9	%
Total operating expenses	384,517			366,845			17,672			4.8	%
Operating income	144,881			131,892			12,989			9.8	%
Other expenses:
Interest expense	(52,109		)	(52,758		)	649			1.2	%
Loss on early extinguishment of debt	(2,157		)	(552		)	(1,605		)	(290.8	)%
Loss from derivative financial instruments	(289		)	—			(289		)	—	%
Income before income taxes	90,326			78,582			11,744			14.9	%
Income tax expense	(4,333		)	(4,340		)	7			0.2	%
Net income	85,993			74,242			11,751			15.8	%
Private perpetual preferred unit distributions	(702		)	(702		)	—			—	%
Net income attributable to non-controlling interests	(39,916		)	(39,050		)	(866		)	(2.2	)%
Net income attributable to common stockholders	$	45,375		$	34,490		$	10,885		31.6	%

Rental Revenue

The increase in rental income was primarily attributable to increased rental rates and higher occupancy.

Tenant Expense Reimbursement

The decrease in tenant expense reimbursements was due to a decrease in our estimated billed expense reimbursements and the mix of updated base years for new and renewal leases.

Observatory Revenue

Observatory revenues were higher primarily due to an improvement in our ticket mix and higher per person average ticket price.

Third-Party Management and Other Fees

The decrease reflects lower management fee income due to the wind-down of activities in certain managed entities.

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Other Revenues and Fees

The increase in other revenues and fees was primarily due to higher lease cancellation income of $9.9 million, higher interest income of $2.0 million and a real estate tax refund of $1.1 million for the nine months ended September 30, 2017.

Property Operating Expenses

The increase in property operating expenses was primarily due to higher repairs and maintenance costs and higher payroll costs, partially offset by lower bad debt expense.

Ground Rent Expenses

Ground rent expense was consistent with 2016.

General and Administrative Expenses

The increase in general and administrative expenses was primarily due to increased equity compensation expense partially offset by lower cash incentive compensation expense.

Observatory Expenses

The increase in Observatory expenses primarily reflect a combination of higher payroll estimates and timing pertaining to certain technology and repair and maintenance costs, partially offset by lower marketing costs.

Real Estate Taxes

The increase in real estate taxes was primarily due to higher assessed values for several properties.

Depreciation and Amortization

The increase in depreciation and amortization was primarily attributable to assets that were placed in service towards the end of 2016 and hence, subject to a full nine months' depreciation in the nine months ended September 30, 2017.

Interest Expense

Interest expense declined due to lower interest rates on new mortgage loan refinancings.

Loss on Early Extinguishment of Debt

The loss on early extinguishment of debt reflects deferred financing costs written off in connection with the modification of the unsecured revolving credit and term loan facility in August 2017.

Loss from Derivative Financial Instruments

The loss from derivative financial instruments consists of the ineffectiveness attributable to a partial termination and re-designation of related cash flow hedges during the nine months ended September 30, 2017.

Income Taxes

Income taxes were consistent with 2016.

Liquidity and Capital Resources

Liquidity is a measure of our ability to meet potential cash requirements, including ongoing commitments to repay borrowings, fund and maintain our assets and operations, including lease-up costs, fund our redevelopment and repositioning programs, acquire properties, make distributions to our securityholders and fulfill other general business needs. Based on the historical experience of our management and our business strategy, in the foreseeable future we anticipate we will generate positive cash flows from operations. In order to qualify as a REIT, we are required under the Internal Revenue Code of 1986 to distribute to our stockholders, on an annual basis, at least 90% of our REIT taxable income, determined without regard to the deduction for dividends paid and excluding net capital gains. We expect to make quarterly distributions to our securityholders.

While we may be able to anticipate and plan for certain liquidity needs, there may be unexpected increases in uses of cash that are beyond our control and which would affect our financial condition and results of operations. For example, we

36

may be required to comply with new laws or regulations that cause us to incur unanticipated capital expenditures for our properties, thereby increasing our liquidity needs. Even if there are no material changes to our anticipated liquidity requirements, our sources of liquidity may be fewer than, and the funds available from such sources may be less than, anticipated or needed. Our primary sources of liquidity will generally consist of cash on hand and cash generated from our operating activities, debt issuances and unused borrowing capacity under our unsecured revolving credit facility. We expect to meet our short-term liquidity requirements, including distributions, operating expenses, working capital, debt service, and capital expenditures from cash flows from operations, cash on hand, debt issuances, and available borrowing capacity under our unsecured revolving credit facility. The availability of these borrowings is subject to the conditions set forth in the applicable loan agreements. We expect to meet our long-term capital requirements, including acquisitions, redevelopments and capital expenditures through our cash flows from operations, cash on hand, our unsecured revolving credit facility, mortgage financings, debt issuances, common and/or preferred equity issuances and asset sales. Our properties require periodic investments of capital for individual lease related tenant improvements allowances, general capital improvements and costs associated with capital expenditures. Our overall leverage will depend on our mix of investments and the cost of leverage. Our charter does not restrict the amount of leverage that we may use.

At September 30, 2017, we had approximately $432.1 million available in cash and cash equivalents, and there was $1.1 billion available under our unsecured revolving credit facility.

As of September 30, 2017, we had approximately $1.6 billion of total consolidated indebtedness outstanding, with a weighted average interest rate of 4.05% (excluding premiums and discount) and a weighted average maturity of 6.2 years. Excluding principal amortization, we have no debt maturing in 2017 and approximately $262.2 million of debt maturing in 2018. Our consolidated net debt to total market capitalization was approximately 15.7% as of September 30, 2017. Given our current liquidity, including availability under our unsecured revolving credit facility, and preliminary discussions with lenders, we believe we will be able to refinance the maturing debt.

Unsecured Revolving Credit and Term Loan Facility

During August 2017, through the Operating Partnership, we entered into an amended and restated senior unsecured revolving credit and term loan facility. This unsecured revolving credit and term loan facility is comprised of a $1.1 billion revolving credit facility and a $265 million term loan facility. The new revolving facility replaces the existing credit facility which was due to mature in January 2019 and is undrawn as of September 30, 2017. The term loan facility was borrowed in full at closing and used to repay the existing $265 million term loan. The unsecured revolving credit and term loan facility contains an accordion feature that would allow us to increase the maximum aggregate principal amount to $1.75 billion under specified circumstances.

The initial maturity of the unsecured revolving credit facility is August 2021. We have the option to extend the initial term for up to two additional six-month periods, subject to certain conditions, including the payment of an extension fee equal to 0.0625% and 0.075% of the then outstanding commitments under the unsecured revolving credit facility on the first and the second extensions, respectively. The term loan facility matures on August 2022.

The unsecured revolving credit facility includes the following financial covenants: (i) maximum leverage ratio of total indebtedness to total asset value (as defined in the agreement) of the loan parties and their consolidated subsidiaries will not exceed 60%, (ii) consolidated secured indebtedness will not exceed 40% of total asset value, (iii) tangible net worth will not be less than $1.2 billion plus 75% of net equity proceeds received by the Operating Partnership (other than proceeds received within ninety days after the redemption, retirement or repurchase of ownership or equity interests in the Operating Partnership up to the amount paid by the Operating Partnership in connection with such redemption, retirement or repurchase, where, the net effect is that the Operating Partnership shall not have increased its net worth as a result of any such proceeds), (iv) adjusted EBITDA (as defined in the unsecured revolving credit facility) to consolidated fixed charges will not be less than 1.50x, (v) the aggregate net operating income with respect to all unencumbered eligible properties to the portion of interest expense attributable to unsecured indebtedness will not be less than 1.75x, and (vi) the ratio of total unsecured indebtedness to unencumbered asset value will not exceed 60%.

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As of September 30, 2017, we were in compliance with the covenants (dollars in thousands):

Financial covenant	Required		September 30, 2017			In Compliance
Maximum total leverage	< 60%		24.2		%	Yes
Maximum secured debt	< 40%		10.9		%	Yes
Minimum fixed charge coverage	> 1.50x		4.5x			Yes
Minimum unencumbered interest coverage	> 1.75x		7.6x			Yes
Maximum unsecured leverage	< 60%		18.9		%	Yes
Minimum tangible net worth	$	1,249,392	$	1,683,912		Yes

The unsecured revolving credit facility contains customary covenants, including limitations on liens, investment, distributions, debt, fundamental changes, and transactions with affiliates, and requires certain customary financial reports.

The unsecured revolving credit facility contains customary events of default (subject in certain cases to specified cure periods), including but not limited to non-payment, breach of covenants, representations or warranties, cross defaults, bankruptcy or other insolvency events, judgments, ERISA events, invalidity of loan documents, loss of real estate investment trust qualification, and occurrence of a change of control (as defined in the agreement for the unsecured credit facility).

Mortgage Debt

During April 2017, we refinanced a mortgage loan collateralized by 1542 Third Avenue. The new $30.0 million loan bears interest at a fixed rate of 4.29% and matures in May 2027.

During May 2017, we refinanced a mortgage loan collateralized by 10 Bank Street. The new $35.0 million loan bears interest at a fixed rate of 4.23% and matures in June 2032.

During June 2017, we refinanced a mortgage loan collateralized by First Stamford Place. The new $180.0 million loans bear a blended interest rate of 4.28% and mature in July 2027. One mortgage loan is for $164.0 million and bears an interest rate of 4.09%. The second loan is for $16.0 million and bears an interest rate of 6.25%.

During June 2017, we refinanced a mortgage loan collateralized by 1010 Third Avenue and 77 West 55th Street. The new $40.0 million loan bears interest at a fixed rate of 4.01% and matures in January 2028.

During June 2017, we refinanced a mortgage loan collateralized by 383 Main Avenue. The new $30.0 million loan bears interest at a fixed rate of 4.44% and matures in June 2032.

Leverage Policies

We expect to employ leverage in our capital structure in amounts determined from time to time by our board of directors. Although our board of directors has not adopted a policy that limits the total amount of indebtedness that we may incur, we anticipate that our board of directors will consider a number of factors in evaluating our level of indebtedness from time to time, as well as the amount of such indebtedness that will be either fixed or floating rate. Our charter and bylaws do not limit the amount or percentage of indebtedness that we may incur nor do they restrict the form in which our indebtedness will be taken (including, but not limited to, recourse or non-recourse debt and cross-collateralized debt). Our overall leverage will depend on our mix of investments and the cost of leverage, however, we initially intend to maintain a level of indebtedness consistent with our plan to seek an investment grade credit rating. Our board of directors may from time to time modify our leverage policies in light of the then-current economic conditions, relative costs of debt and equity capital, market values of our properties, general market conditions for debt and equity securities, fluctuations in the market price of our common stock, growth and acquisition opportunities and other factors.

Capital Expenditures

The following tables summarize our tenant improvement costs, leasing commission costs and our capital expenditures for each of the periods presented (dollars in thousands, except per square foot amounts).

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Office Properties⁽¹⁾

	Nine Months Ended September 30,
Total New Leases, Expansions, and Renewals	2017		2016
Number of leases signed(2)	106		130
Total square feet	946,096		741,843
Leasing commission costs(3)	$	18,931	$	13,105
Tenant improvement costs(3)	65,884		44,788
Total leasing commissions and tenant improvement costs(3)	$	84,815	$	57,893
Leasing commission costs per square foot(3)	$	20.01	$	17.67
Tenant improvement costs per square foot(3)	69.64		60.37
Total leasing commissions and tenant improvement costs per square foot(3)	$	89.65	$	78.04

Retail Properties⁽⁴⁾

	Nine Months Ended September 30,
Total New Leases, Expansions, and Renewals	2017		2016
Number of leases signed(2)	6		13
Total square feet	72,616		39,183
Leasing commission costs(3)	$	3,355	$	2,221
Tenant improvement costs(3)	2,021		4,433
Total leasing commissions and tenant improvement costs(3)	$	5,376	$	6,654
Leasing commission costs per square foot(3)	$	46.20	$	56.69
Tenant improvement costs per square foot(3)	27.83		113.13
Total leasing commissions and tenant improvement costs per square foot(3)	$	74.03	$	169.82

_______________

(1) Excludes an aggregate of 494,935 and 502,429 rentable square feet of retail space in our Manhattan office properties in 2017 and 2016, respectively. Includes the Empire State Building broadcasting licenses and observatory operations.

(2) Presents a renewed and expansion lease as one lease signed.

(3) Presents all tenant improvement and leasing commission costs as if they were incurred in the period in which the lease was signed, which may be different than the period in which they were actually paid.

(4) Includes an aggregate of 494,935 and 502,429 rentable square feet of retail space in our Manhattan office properties in 2017 and 2016, respectively. Excludes the Empire State Building broadcasting licenses and observatory operations.

	Nine Months Ended September 30,
	2017		2016
Total Portfolio
Capital expenditures (1)	$	86,682	$	54,975

_______________

(1) Excludes tenant improvements and leasing commission costs.

As of September 30, 2017, we expect to incur additional costs relating to obligations under signed new leases of approximately $78.1 million for tenant improvements and other improvements related to new leases and approximately $0.1 million on leasing commissions. We intend to fund the tenant improvements and leasing commission costs through a combination of operating cash flow, cash on hand and borrowings under the unsecured revolving credit facility.

Capital expenditures are considered part of both our short-term and long-term liquidity requirements. We intend to fund the capital improvements to complete the redevelopment and repositioning program through a combination of operating cash flow, cash on hand and borrowings under the unsecured revolving credit facility.

Contractual Obligations

Refer to our Annual Report on Form 10-K for the year ended December 31, 2016 for a discussion of our contractual obligations. There has been no material changes, outside the ordinary course of business, to these contractual obligations during the nine months ended September 30, 2017.

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Off-Balance Sheet Arrangements

As of September 30, 2017, we did not have any off-balance sheet arrangements.

Distribution Policy

In order to qualify as a REIT, we must distribute to our securityholders, on an annual basis, at least 90% of our REIT taxable income, determined without regard to the deduction for dividends paid and excluding net capital gains. In addition, we will be subject to U.S. federal income tax at regular corporate rates to the extent that we distribute less than 100% of our net taxable income (including net capital gains) and will be subject to a 4% nondeductible excise tax on the amount, if any, by which our distributions in any calendar year are less than a minimum amount specified under U.S. federal income tax laws. We intend to distribute our net income to our securityholders in a manner intended to satisfy the REIT 90% distribution requirement and to avoid U.S. federal income tax liability on our income and the 4% nondeductible excise tax.

Before we pay any distribution, whether for U.S. federal income tax purposes or otherwise, we must first meet both our operating requirements and obligations to make payments of principal and interest, if any. However, under some circumstances, we may be required to use cash reserves, incur debt or liquidate assets at rates or times that we regard as unfavorable or make a taxable distribution of our shares in order to satisfy the REIT 90% distribution requirement and to avoid U.S. federal income tax and the 4% nondeductible excise tax in that year.

Distributions to Securityholders

Distributions and dividends amounting to $95.2 million and $83.3 million have been made to securityholders for the nine months endedSeptember 30, 2017 and 2016, respectively.

Cash Flows

Comparison of Nine Months Ended September 30, 2017 to the Nine Months Ended September 30, 2016

Net cash. Cash and cash equivalents were $432.1 million and $594.3 million, respectively, as of September 30, 2017 and 2016. The decrease was primarily attributable to increased capital expenditures and net repayment of mortgage debt.

Operating activities. Net cash provided by operating activities increased by $11.8 million, to $173.9 million, for the nine months endedSeptember 30, 2017 compared to $162.1 million for the nine months endedSeptember 30, 2016, primarily due to higher cash rents partially offset by a cash payment to settle two of our forward starting interest rate hedge agreements.

Investing activities. Net cash used in investing activities increased by $38.9 million, to $159.2 million, for the nine months endedSeptember 30, 2017 compared to $120.3 million for the nine months endedSeptember 30, 2016, primarily due to higher expenditures on building and tenant improvements.

Financing activities. Net cash provided by financing activities decreased by $642.8 million, to $137.0 million used in financing activities for the nine months endedSeptember 30, 2017 compared to $505.8 million provided by financing activities for the nine months endedSeptember 30, 2016, primarily due to net proceeds on issuance of common stock to QIA in August 2016.

Net Operating Income ("NOI")

Our internal financial reports include a discussion of property net operating income. NOI is a non-GAAP financial measure of performance. NOI is used by our management to evaluate and compare the performance of our properties and to determine trends in earnings and to compute the fair value of our properties as it is not affected by: (i) the cost of funds of the property owner, (ii) the impact of depreciation and amortization expenses as well as gains or losses from the sale of operating real estate assets that are included in net income computed in accordance with GAAP, (iii) acquisition expenses and break-up fee, or (iv) general and administrative expenses and other gains and losses that are specific to the property owner. The cost of funds is eliminated from net operating income because it is specific to the particular financing capabilities and constraints of the owner. The cost of funds is also eliminated because it is dependent on historical interest rates and other costs of capital as well as past decisions made by us regarding the appropriate mix of capital which may have changed or may change in the future. Depreciation and amortization expenses as well as gains or losses from the sale of operating real estate assets are eliminated because they may not accurately represent the actual change in value in our office or retail properties that result from use of the properties or changes in market conditions. While certain aspects of real property do decline in value over time in a manner that is reasonably captured by depreciation and amortization, the value of the properties as a whole have historically increased or decreased as a result of changes in overall economic conditions

40

instead of from actual use of the property or the passage of time. Gains and losses from the sale of real property vary from property to property and are affected by market conditions at the time of sale which will usually change from period to period. These gains and losses can create distortions when comparing one period to another or when comparing our operating results to the operating results of other real estate companies that have not made similarly-timed purchases or sales. We believe that eliminating these costs from net income is useful because the resulting measure captures the actual revenue, generated and actual expenses incurred in operating our properties as well as trends in occupancy rates, rental rates and operating costs.

However, the usefulness of NOI is limited because it excludes general and administrative costs, interest expense, depreciation and amortization expense and gains or losses from the sale of properties, and other gains and losses as stipulated by GAAP, the level of capital expenditures and leasing costs necessary to maintain the operating performance of our properties, all of which are significant economic costs. NOI may fail to capture significant trends in these components of net income which further limits its usefulness.

NOI is a measure of the operating performance of our properties but does not measure our performance as a whole. NOI is therefore not a substitute for net income as computed in accordance with GAAP. This measure should be analyzed in conjunction with net income computed in accordance with GAAP and discussions elsewhere in this Management’s Discussion and Analysis of Financial Condition and Results of Operations regarding the components of net income that are eliminated in the calculation of NOI. Other companies may use different methods for calculating NOI or similarly titled measures and, accordingly, our NOI may not be comparable to similarly titled measures reported by other companies that do not define the measure exactly as we do.

The following table presents a reconciliation of our net income, the most directly comparable GAAP measure, to NOI for the periods presented (amounts in thousands):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
	(unaudited)						(unaudited)
Net income	$	35,489		$	32,897		$	85,993		$	74,242
Add:
General and administrative expenses	12,899			11,798			36,566			35,623
Depreciation and amortization	38,490			37,607			119,868			115,382
Interest expense	16,890			17,939			52,109			52,758
Loss on early extinguishment of debt	2,157			—			2,157			552
Loss from derivative financial instruments	—			—			289			—
Acquisition expenses	—			—			—			98
Income tax expense	2,245			2,750			4,333			4,340
Less:
Third-party management and other fees	(345		)	(404		)	(1,088		)	(1,372		)
Net operating income	$	107,825		$	102,587		$	300,227		$	281,623
Other Net Operating Income Data
Straight-line rental revenue	$	6,861		$	9,619		$	20,581		$	21,495
Net increase in rental revenue from the amortization of above- and below-market lease assets and liabilities	$	1,607		$	1,210		$	4,154		$	6,285
Amortization of acquired below-market ground leases	$	1,957		$	1,957		$	5,873		$	5,873

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Funds from Operations ("FFO")

We present below a discussion of FFO. We compute FFO in accordance with the “White Paper” on FFO published by the National Association of Real Estate Investment Trusts, or NAREIT, which defines FFO as net income (loss) (determined in accordance with GAAP), excluding impairment write-downs of investments in depreciable real estate and investments in in-substance real estate investments, gains or losses from debt restructurings and sales of depreciable operating properties, plus real estate-related depreciation and amortization (excluding amortization of deferred financing costs), less distributions to non-controlling interests and gains/losses from discontinued operations and after adjustments for unconsolidated partnerships and joint ventures. FFO is a widely recognized non-GAAP financial measure for REITs that we believe, when considered with financial statements determined in accordance with GAAP, is useful to investors in understanding financial performance and providing a relevant basis for comparison among REITs. In addition, FFO is useful to investors as it captures features particular to real estate performance by recognizing that real estate has generally appreciated over time or maintains residual value to a much greater extent than do other depreciable assets. Investors should review FFO, along with GAAP net income, when trying to understand an equity REIT’s operating performance. We present FFO because we consider it an important supplemental measure of our operating performance and believe that it is frequently used by securities analysts, investors and other interested parties in the evaluation of REITs. However, because FFO excludes depreciation and amortization and captures neither the changes in the value of our properties that result from use or market conditions nor the level of capital expenditures and leasing commissions necessary to maintain the operating performance of our properties, all of which have real economic effect and could materially impact our results of operations, the utility of FFO as a measure of performance is limited. There can be no assurance that FFO presented by us is comparable to similarly titled measures of other REITs. FFO does not represent cash generated from operating activities and should not be considered as an alternative to net income (loss) determined in accordance with GAAP or to cash flow from operating activities determined in accordance with GAAP. FFO is not indicative of cash available to fund ongoing cash needs, including the ability to make cash distributions. Although FFO is a measure used for comparability in assessing the performance of REITs, as the NAREIT White Paper only provides guidelines for computing FFO, the computation of FFO may vary from one company to another.

Modified Funds From Operations ("Modified FFO")

Modified FFO adds back an adjustment for any above or below-market ground lease amortization to traditionally defined FFO. We consider this a useful supplemental measure in evaluating our operating performance due to the non-cash accounting treatment under GAAP, which stems from the third quarter 2014 acquisition of two option properties as they carry significantly below market ground leases, the amortization of which is material to our overall results. We present Modified FFO because we consider it an important supplemental measure of our operating performance in that it adds back the non-cash amortization of below-market ground leases. There can be no assurance that Modified FFO presented by us is comparable to similarly titled measures of other REITs. Modified FFO does not represent cash generated from operating activities and should not be considered as an alternative to net income (loss) determined in accordance with GAAP or to cash flow from operating activities determined in accordance with GAAP. Modified FFO is not indicative of cash available to fund ongoing cash needs, including the ability to make cash distributions.

Core Funds From Operations ("Core FFO")

Core FFO adds back to Modified FFO the following items: acquisition expenses, deferred financing costs write-offs, prepayment penalties and acquisition break-up fee. The Company presents Core FFO because it considers it an important supplemental measure of its operating performance in that it excludes non-recurring items. There can be no assurance that Core FFO presented by the Company is comparable to similarly titled measures of other REITs. Core FFO does not represent cash generated from operating activities and should not be considered as an alternative to net income (loss) determined in accordance with GAAP or to cash flow from operating activities determined in accordance with GAAP. Core FFO is not indicative of cash available to fund ongoing cash needs, including the ability to make cash distributions. In future periods, we may also exclude other items from Core FFO that we believe may help investors compare our results.

The following table presents a reconciliation of our net income, the most directly comparable GAAP measure, to FFO, Modified FFO and Core FFO for the periods presented (amounts in thousands, except per share amounts):

42

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
	(unaudited)						(unaudited)
Net income	$	35,489		$	32,897		$	85,993		$	74,242
Private perpetual preferred unit distributions	(234		)	(234		)	(702		)	(702		)
Real estate depreciation and amortization	38,134			37,318			118,690			114,779
FFO attributable to common stockholders and non-controlled interests	73,389			69,981			203,981			188,319
Amortization of below-market ground leases	1,957			1,957			5,873			5,873
Modified FFO attributable to common stockholders and non-controlled interests	75,346			71,938			209,854			194,192
Loss on early extinguishment of debt	2,157			—			2,157			552
Acquisition expenses	—			—			—			98
Core FFO attributable to common stockholders and non-controlled interests	$	77,503		$	71,938		$	212,011		$	194,842
Weighted average shares and Operating Partnership Units
Basic	296,389			278,739			296,389			270,388
Diluted	297,871			280,614			298,089			271,028

Factors That May Influence Future Results of Operations

Leasing

We signed 1.0 million rentable square feet of new leases, expansions and lease renewals for the year ended December 31, 2016. During the nine months endedSeptember 30, 2017, we signed 1.0 million rentable square feet of new leases, expansions and renewals.

Due to the relatively small number of leases that are signed in any particular quarter, one or more larger leases may have a disproportionately positive or negative impact on average rent, tenant improvement and leasing commission costs for that period. As a result, we believe it is more appropriate when analyzing trends in average rent and tenant improvement and leasing commission costs to review activity over multiple quarters or years. Tenant improvement costs include expenditures for general improvements occurring concurrently with, but that are not directly related to, the cost of installing a new tenant. Leasing commission costs are similarly subject to significant fluctuations depending upon the length of leases being signed and the mix of tenants from quarter to quarter.

As of September 30, 2017, there were approximately 0.8 million rentable square feet of space in our portfolio available to lease (excluding leases signed but not yet commenced) representing 8.3% of the net rentable square footage of the properties in our portfolio. In addition, leases representing 2.6% and 7.7% of net rentable square footage of the properties in our portfolio will expire in 2017 and in 2018, respectively. These leases are expected to represent approximately 2.4% and 8.1%, respectively, of our annualized rent for such periods. Our revenues and results of operations can be impacted by expiring leases that are not renewed or re-leased or that are renewed or re-leased at base rental rates equal to, above or below the current average base rental rates. Further, our revenues and results of operations can also be affected by the costs we incur to re-lease available space, including payment of leasing commissions, redevelopments and build-to-suit remodeling that may not be borne by the tenant.

We believe that as we complete the redevelopment and repositioning of our properties we will, over the long-term, experience increased occupancy levels and rents. Over the short term, as we renovate and reposition our properties, which includes aggregating smaller spaces to offer large blocks of space, we may experience lower occupancy levels as a result of having to relocate tenants to alternative space and the strategic expiration of existing leases. We believe that despite the short-term lower occupancy levels we may experience, we will continue to experience increased rental revenues as a result of the increased rents which we expect to obtain following the redevelopment and repositioning of our properties.

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Observatory and Broadcasting Operations

The Empire State Building Observatory revenue for the third quarter 2017 was $39.3 million, a 3.1% increase from $38.1 million for the third quarter 2016. The Observatory hosted approximately 1,276,000 visitors in the third quarter 2017 versus 1,340,000 visitors in the third quarter 2016, a decrease of 4.8%. In the third quarter 2017, there were 14 bad weather days compared to 10 bad weather days in the third quarter 2016.

Observatory revenue was $94.2 million for the nine months ended September 30, 2017, a 3.4% increase from $91.1 million for the nine months ended September 30, 2016. For the nine months ended September 30, 2017, the Observatory hosted 3,038,000 visitors versus 3,183,000 visitors from the same period in 2016, a decrease of 4.6%. For the nine months ended September 30, 2017, there were 51 bad weather days compared to 31 bad weather days in the nine months ended September 30, 2016.

Observatory revenues and admissions are dependent upon the following: (i) the number of tourists (domestic and international) that come to New York City and visit the observatory, as well as any related tourism trends; (ii) the prices per admission that can be charged; (iii) seasonal trends affecting the number of visitors to the observatory; (iv) competition, in particular from other new and existing observatories; and (v) weather trends.

We license the use of the Empire State Building mast to third party television and radio broadcasters and providers of data communications.  We also lease space in the upper floors of the building to such licensees to house their transmission equipment and related facilities. During the nine months endedSeptember 30, 2017, we derived $14.5 million of revenue and $5.1 million of expense reimbursements from the Empire State Building’s broadcasting licenses and related leases. The broadcasting licenses and related leases generally expire between 2017 and 2032. The business of broadcasting TV and radio signals over the air is in flux, due to deteriorating industry fundamentals, and there is competition from other broadcasting operations. We have made preliminary renewal proposals which, if accepted, would yield reduced revenues and higher capital expenditures.

During the nine months endedSeptember 30, 2017, we signed long-term lease and license renewals with four of our radio broadcasters, Spanish Broadcast Systems, New York Public Radio, iHeart radio and CBS Radio for a total of 13 radio stations at the Empire State Building. In addition, Ion Television and Fox Television notified us that they will not renew their lease and license and will vacate upon their lease expiration at the end of 2017. We remain in ongoing negotiations with our other broadcast tenants.

Critical Accounting Estimates

Refer to our Annual Report on Form 10-K for the year ended December 31, 2016 for a discussion of our critical accounting estimates. There were no material changes to our critical accounting estimates disclosed in our Annual Report on Form 10-K for the year ended December 31, 2016.

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ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Our future income, cash flows and fair values relevant to financial instruments are dependent upon prevalent market interest rates. Market risk refers to the risk of loss from adverse changes in market prices and interest rates. One of the principal market risks facing us is interest rate risk on our variable rate indebtedness. As of September 30, 2017, we had no variable rate debt as the LIBOR rate on our unsecured term loan facility of $265.0 million was fixed at 2.1485% under a variable to fixed interest rate swap agreement.

Subject to maintaining our qualification as a REIT for U.S. federal income tax purposes, we may mitigate the risk of interest rate volatility through the use of hedging instruments, such as interest rate swap agreements and interest rate cap agreements. Our primary objectives when undertaking hedging transactions and derivative positions will be to reduce our floating rate exposure and to fix a portion of the interest rate for anticipated financing and refinancing transactions. This in turn will reduce the risk that the variability of cash flows will impose on floating rate debt. However, we can provide no assurances that our efforts to manage interest rate volatility will successfully mitigate the risks of such volatility on our portfolio. We are not subject to foreign currency risk.

We are exposed to interest rate changes primarily on our unsecured revolving credit facility and debt refinancings. Our objectives with respect to interest rate risk are to limit the impact of interest rate changes on operations and cash flows, and to lower our overall borrowing costs. To achieve these objectives, we may borrow at fixed rates and may enter into derivative financial instruments such as interest rate swaps or caps in order to mitigate our interest rate risk on a related floating rate financial instrument. We do not enter into derivative or interest rate transactions for speculative purposes.

We entered into interest rate LIBOR swap agreements with an aggregate notional value of $790.0 million, which fix LIBOR interest rates between 2.1485% and 2.7620% and mature between August 2022 and June 2028. All interest rate swaps as of September 30, 2017 have been designated as cash flow hedges and are deemed highly effective, with a fair value of ($13.4 million) which is included in accounts payable and accrued expenses on the condensed consolidated balance sheet.

As of September 30, 2017, the weighted average interest rate on the $1.6 billion of fixed-rate indebtedness outstanding was 4.05% per annum, each with maturities at various dates through June 30, 2032.

As of September 30, 2017, the fair value of our outstanding debt was approximately $1.6 billion, which was approximately $25.4 million more than the historical book value as of such date. Interest risk amounts were determined by considering the impact of hypothetical interest rates on our financial instruments. These analyses do not consider the effect of any change in overall economic activity that could occur in that environment. Further, in the event of a change of that magnitude, we may take actions to further mitigate our exposure to the change. However, due to the uncertainty of the specific actions that would be taken and their possible effects, these analyses assume no changes in our financial structure.

Our exposures to market risk have not changed materially since December 31, 2016.

ITEM 4. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

We maintain disclosure controls and procedures (as such term is defined in Rule 13a-15(e) and 15d-15(e) under the Exchange Act) that are designed to ensure that information required to be disclosed in our reports under the Exchange Act is processed, recorded, summarized and reported within the time periods specified in the SEC’s rules and regulations and that such information is accumulated and communicated to management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow for timely decisions regarding required disclosure. In designing and evaluating the disclosure controls and procedures, management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives, and management is required to apply its judgment in evaluating the cost-benefit relationship of possible controls and procedures.

As of September 30, 2017, the end of the period covered by this Report, we carried out an evaluation, under the supervision and with the participation of management, including our Chief Executive Officer and Chief Financial Officer, regarding the effectiveness of our disclosure controls and procedures at the end of the period covered by this Report. Based on the foregoing, our Chief Executive Officer and Chief Financial Officer concluded, as of that time, that our disclosure controls and procedures were effective in ensuring that information required to be disclosed by us in reports filed or submitted under the Exchange Act (i) is processed, recorded, summarized and reported within the time periods specified in the SEC’s rules and forms and (ii) is accumulated and communicated to our management, including our Chief Executive Officer and our Chief Financial Officer, as appropriate to allow for timely decisions regarding required disclosure.

45

Changes in Internal Control over Financial Reporting

No changes to our internal control over financial reporting were identified in connection with the evaluation referenced above that occurred during the period covered by this report that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

See Note 8 to the Notes to Condensed Consolidated Financial Statements for a description of legal proceedings.

ITEM 1A. RISK FACTORS

There have been no material changes to the risk factors included in the section entitled "Risk Factors" in our December 31, 2016 Annual Report on Form 10-K.

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

Issuer Repurchases; Unregistered Sales of Securities

During the third quarter of 2017, the Company repurchased 11 shares of Class A common stock and 29 Series PR operating partnership units, for an aggregate purchase price of $845.20, at a price of $21.13 per share.  This limited repurchase activity by the Company during the third quarter resulted from the release of a contingency reserve fund created by the selling entities in July 2014, at the time of the Company’s acquisition of the ground and operating leases at 112 West 34^th Street and the ground lease at 1400 Broadway.  On July 14, 2017, investors in the entities that previously owned these leases were delivered the portion of the consideration payable to such investors that had been deferred for a three-year period pending resolution of any contingencies.  Absent any contingencies, such consideration was released and the Company agreed to repurchase (and subsequently retire) any fractional shares of Class A common stock or Series PR operating partnership units due to such investors, while delivering cash for the value of any fractional shares to such investors.  The repurchase price was determined based upon the highest closing price for shares of Class A common stock on the New York Stock Exchange during the period July 1, 2017 to July 15, 2017.  Shares of the Company’s Class A common stock and Series PR operating partnership units were issued at $16.65 per share/unit in connection with the closing of the acquisition transaction on July 15, 2014.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None

ITEM 4. MINE SAFETY DISCLOSURES

Not Applicable

ITEM 5. OTHER INFORMATION

None

ITEM 6. EXHIBITS

The information under the heading "Exhibit Index" below is incorporated herein by reference.

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SIGNATURES

Pursuant to the requirements 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.

EMPIRE STATE REALTY TRUST, INC.

Date: November 6, 2017                             By:/s/ David A. Karp

Executive Vice President and Chief Financial Officer

(Principal Financial Officer)

Date: November 6, 2017                             By:/s/ Andrew J. Prentice

Senior Vice President, Chief Accounting Officer and Treasurer

(Principal Accounting Officer)

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Exhibit Index

Exhibit No.	Description
10-1	Amended and Restated Credit Agreement, dated August 29, 2017, among the Company, the Operating Partnership, as borrower, Bank of America, N.A., as administrative agent, Merrill Lynch, Pierce, Fenner & Smith Incorporated and Wells Fargo Securities, LLC as Joint Lead Arrangers and Joint Bookrunners, Wells Fargo, National Association and Capital One, National Association, as co-syndication agents, and the lenders party thereto, incorporated by reference to Exhibit 10.1 to the Registrant's Form 8-K, filed with the SEC on September 5, 2017.
31.1*	Certification of Chief Executive Officer pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2*	Certification of Chief Financial Officer pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1*	Certification of Chief Executive Officer pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2*	Certification of Chief Financial Officer pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS*	XBRL Instance Document
101.SCH*	XBRL Taxonomy Extension Schema Document
101.CAL*	XBRL Taxonomy Extension Calculation Document
101.DEF*	XBRL Taxonomy Extension Definitions Document
101.LAB*	XBRL Taxonomy Extension Labels Document
101.PRE*	XBRL Taxonomy Extension Presentation Document
Notes:
* Filed herewith.

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EX-31.1

EXHIBIT 31.1

Certification of Chief Executive Officer pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Anthony E. Malkin, certify that:

1.    I have reviewed this Quarterly Report on Form 10-Q of Empire State Realty Trust, Inc.;

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(s) 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(s) 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.

Dated: November 6, 2017 By: /s/ Anthony E. Malkin 
Anthony E. Malkin Chairman and Chief Executive Officer

EX-31.2

EXHIBIT 31.2

Certification of Chief Financial Officer pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, David A. Karp, certify that:

1.    I have reviewed this Quarterly Report on Form 10-Q of Empire State Realty Trust, Inc.;

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(s) 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(s) 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.

Dated: November 6, 2017 By: /s/ David A. Karp 
David A. Karp Executive Vice President and Chief Financial Officer

AMR-444272-v1 1 80-40476364

EX-32.1

EXHIBIT 32.1

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Pursuant to 18 U.S.C. Section 1350, adopted pursuant to Section 906 of The Sarbanes-Oxley Act of 2002, the undersigned Chief Executive Officer of Empire State Realty Trust, Inc. (the "Company"), hereby certifies, to his knowledge that the Quarterly Report on Form 10-Q for the nine months ended September 30, 2017 (the "Report"), as filed with the Securities and Exchange Commission on the date hereof, fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934, as amended, and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: November 6, 2017 By: /s/ Anthony E. Malkin 
Anthony E. Malkin Chairman and Chief Executive Officer

EX-32.2

EXHIBIT 32.2

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER

PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Pursuant to 18 U.S.C. Section 1350, adopted pursuant to Section 906 of The Sarbanes-Oxley Act of 2002, the undersigned, Executive Vice President and Chief Financial Officer of Empire State Realty Trust, Inc. (the "Company"), hereby certifies, to his knowledge that the Quarterly Report on Form 10-Q for the nine months ended September 30, 2017 (the "Report"), as filed with the Securities and Exchange Commission on the date hereof, fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934, as amended, and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: November 6, 2017 By: /s/ David A. Karp 
David A. Karp Executive Vice President and Chief Financial Officer

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Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 31, 2017
Entity Registrant Name	Empire State Realty Trust, Inc.
Entity Central Index Key	0001541401
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
Entity Filer Category	Large Accelerated Filer
Class A Common Stock
Entity Common Stock, Shares Outstanding		158,616,019
Class B Common Stock
Entity Common Stock, Shares Outstanding		1,076,990

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Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Commercial real estate properties, at cost:
Land	$ 201,196	$ 201,196
Development costs	7,978	7,951
Building and improvements	2,398,964	2,249,482
Commercial real estate properties, at cost, gross	2,608,138	2,458,629
Less: accumulated depreciation	(631,916)	(556,546)
Commercial real estate properties, net	1,976,222	1,902,083
Cash and cash equivalents	432,105	554,371
Restricted cash	64,020	61,514
Tenant and other receivables, net of allowance of $3,504 and $3,333 in 2017 and 2016, respectively	34,661	22,542
Deferred rent receivables, net of allowance of $187 and $390 in 2017 and 2016, respectively	172,665	152,074
Prepaid expenses and other assets	39,463	53,749
Deferred costs, net	268,132	277,081
Acquired below-market ground leases, net	370,187	376,060
Goodwill	491,479	491,479
Total assets	3,848,934	3,890,953
Liabilities:
Mortgage notes payable, net	720,830	759,016
Senior unsecured notes, net	592,914	590,388
Unsecured term loan facility, net	263,546	262,927
Unsecured revolving credit facility	0	0
Accounts payable and accrued expenses	142,690	134,064
Acquired below-market leases, net	70,013	82,300
Deferred revenue and other liabilities	41,320	32,212
Tenants’ security deposits	47,395	47,183
Total liabilities	1,878,708	1,908,090
Commitments and contingencies
Empire State Realty Trust, Inc. stockholders' equity:
Preferred stock	0	0
Additional paid-in capital	1,116,026	1,104,463
Accumulated other comprehensive loss	(10,425)	(2,789)
Retained earnings	46,436	50,904
Total Empire State Realty Trust, Inc.'s stockholders' equity	1,153,631	1,154,136
Non-controlling interests in operating partnership	808,591	820,723
Private perpetual preferred units, $16.62 per unit liquidation preference, 1,560,360 issued and outstanding in 2017 and 2016	8,004	8,004
Total equity	1,970,226	1,982,863
Total liabilities and equity	3,848,934	3,890,953
Class A Common Stock
Empire State Realty Trust, Inc. stockholders' equity:
Common stock	1,583	1,547
Class B Common Stock
Empire State Realty Trust, Inc. stockholders' equity:
Common stock	$ 11	$ 11

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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets:
Tenant and other receivables allowance	$ 3,504	$ 3,333
Deferred rent receivables allowance	$ 187	$ 390
Equity:
Preferred stock, par value (in USD per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Private perpetual preferred units, per unit liquidation preference (in USD per share)	$ 16.62	$ 16.62
Private perpetual preferred units, issued (in shares)	1,560,360	1,560,360
Private perpetual preferred units, outstanding (in shares)	1,560,360	1,560,360
Class A Common Stock
Equity:
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	400,000,000	400,000,000
Common stock, shares issued (in shares)	158,349,708	154,744,740
Common stock, shares outstanding (in shares)	158,349,708	154,744,740
Class B Common Stock
Equity:
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	1,077,740	1,095,737
Common stock, shares outstanding (in shares)	1,077,740	1,095,737

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Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues:
Rental revenue	$ 122,391	$ 115,634	$ 360,348	$ 343,155
Tenant expense reimbursement	20,346	19,176	53,889	56,350
Observatory revenue	39,306	38,093	94,212	91,112
Third-party management and other fees	345	404	1,088	1,372
Other revenue and fees	4,932	2,541	19,861	6,748
Total revenues	187,320	175,848	529,398	498,737
Operating expenses:
Property operating expenses	41,270	38,585	122,009	115,075
Ground rent expenses	2,331	2,331	6,994	6,994
General and administrative expenses	12,899	11,798	36,566	35,623
Observatory expenses	8,648	7,250	23,079	21,900
Real estate taxes	26,901	24,691	76,001	71,773
Acquisition expenses	0	0	0	98
Depreciation and amortization	38,490	37,607	119,868	115,382
Total operating expenses	130,539	122,262	384,517	366,845
Total operating income	56,781	53,586	144,881	131,892
Other expenses:
Interest expense	(16,890)	(17,939)	(52,109)	(52,758)
Loss on early extinguishment of debt	(2,157)	0	(2,157)	(552)
Loss from derivative financial instruments	0	0	(289)	0
Income before income taxes	37,734	35,647	90,326	78,582
Income tax expense	(2,245)	(2,750)	(4,333)	(4,340)
Net income	35,489	32,897	85,993	74,242
Private perpetual preferred unit distributions	(234)	(234)	(702)	(702)
Net income attributable to non-controlling interests	(16,449)	(16,690)	(39,916)	(39,050)
Net income attributable to common stockholders	$ 18,806	$ 15,973	$ 45,375	$ 34,490
Total weighted average shares:
Basic (in shares)	158,102	136,831	157,796	126,740
Diluted (in shares)	297,871	280,614	298,089	271,028
Earnings per share attributable to common stockholders:
Basic (in USD per share)	$ 0.12	$ 0.12	$ 0.29	$ 0.27
Diluted (in USD per share)	0.12	0.12	0.29	0.27
Dividends per share (in USD per share)	$ 0.105	$ 0.105	$ 0.315	$ 0.295

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Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 35,489	$ 32,897	$ 85,993	$ 74,242
Other comprehensive income (loss):
Change in unrealized gain (loss) on valuation of interest rate swap agreements	(1,279)	930	(14,252)	(29,305)
Other comprehensive income (loss)	(1,279)	930	(14,252)	(29,305)
Comprehensive income (loss)	34,210	33,827	71,741	44,937
Net income attributable to non-controlling interests and private perpetual preferred unitholders	(16,683)	(16,924)	(40,618)	(39,752)
Other comprehensive (income) loss attributable to non-controlling interests	586	(979)	6,670	15,561
Comprehensive income (loss) attributable to common stockholders	$ 18,113	$ 15,924	$ 37,793	$ 20,746

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Condensed Consolidated Statements of Stockholders' Equity - 9 months ended Sep. 30, 2017 - USD ($) $ in Thousands	Total	Class A Common Stock	Class B Common Stock	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Total Stockholders' Equity	Non-controlling Interests	Private Perpetual Preferred Units
Beginning balance (in shares) at Dec. 31, 2016		154,744,740	1,095,737	154,745,000	1,096,000
Beginning balance at Dec. 31, 2016	$ 1,982,863			$ 1,547	$ 11	$ 1,104,463	$ (2,789)	$ 50,904	$ 1,154,136	$ 820,723	$ 8,004
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of operating partnership units and Class B shares to Class A shares (in shares)				3,577,000	(18,000)
Conversion of operating partnership units and Class B shares to Class A shares	0			$ 36	$ 0	11,087	(54)		11,069	(11,069)
Equity compensation:
LTIP units	10,332									10,332
Restricted stock, net of forfeitures (in shares)				28,000
Restricted stock, net of forfeitures	476					476			476
Dividends and distributions	(95,186)							(49,843)	(49,843)	(44,641)	(702)
Net income	85,993							45,375	45,375	39,916	702
Unrealized gain (loss) on valuation of interest rate swap agreements	(14,252)						(7,582)		(7,582)	(6,670)
Ending balance (in shares) at Sep. 30, 2017		158,349,708	1,077,740	158,350,000	1,078,000
Ending balance at Sep. 30, 2017	$ 1,970,226			$ 1,583	$ 11	$ 1,116,026	$ (10,425)	$ 46,436	$ 1,153,631	$ 808,591	$ 8,004

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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash Flows From Operating Activities
Net income	$ 85,993	$ 74,242
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	119,868	115,382
Amortization of non-cash items within interest expense	919	516
Amortization of acquired above- and below-market leases, net	(4,154)	(6,285)
Amortization of acquired below-market ground leases	5,873	5,873
Straight-lining of rental revenue	(20,590)	(21,495)
Equity based compensation	10,808	7,254
Settlement of derivative contracts	(6,335)	0
Loss on early extinguishment of debt	2,157	552
Increase (decrease) in cash flows due to changes in operating assets and liabilities:
Restricted cash	(703)	3,120
Tenant and other receivables	(12,119)	(788)
Deferred leasing costs	(21,660)	(18,642)
Prepaid expenses and other assets	13,672	16,775
Accounts payable and accrued expenses	(8,917)	(7,223)
Deferred revenue and other liabilities	9,108	(7,213)
Net cash provided by operating activities	173,920	162,068
Cash Flows From Investing Activities
(Increase) decrease in restricted cash for investing activities	(1,590)	558
Development costs	(27)	(450)
Additions to building and improvements	(157,579)	(120,401)
Net cash used in investing activities	(159,196)	(120,293)
Cash Flows From Financing Activities
Proceeds from mortgage notes payable	315,000	50,000
Repayment of mortgage notes payable	(344,618)	(29,220)
Proceeds from unsecured revolving credit facility and term loan	265,000	50,000
Repayments of unsecured revolving credit facility and term loan	(265,000)	(90,000)
Net proceeds from the sale of common stock	0	611,278
Deferred financing costs	(12,186)	(2,905)
Private perpetual preferred unit distributions	(702)	(702)
Dividends paid to common stockholders	(49,843)	(39,491)
Distributions paid to non-controlling interests in the operating partnership	(44,641)	(43,123)
Net cash (used in) provided by financing activities	(136,990)	505,837
Net (decrease) increase in cash and cash equivalents	(122,266)	547,612
Cash and cash equivalents—beginning of period	554,371	46,685
Cash and cash equivalents—end of period	432,105	594,297
Supplemental disclosures of cash flow information:
Cash paid for interest	53,918	53,286
Cash paid for income taxes	5,004	3,495
Non-cash investing and financing activities:
Building and improvements included in accounts payable and accrued expenses	72,130	71,444
Derivative instruments at fair values included in accounts payable and accrued expenses	13,378	31,227
Conversion of operating partnership units and Class B shares to Class A shares	$ 11,087	$ 19,941

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Description of Business and Organization

9 Months Ended

Sep. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Description of Business and Organization

Description of Business and Organization

As used in these condensed consolidated financial statements, unless the context otherwise requires, “we,” “us,” “our,” the “company,” and "ESRT" mean Empire State Realty Trust, Inc. and its consolidated subsidiaries.

    We are a self-administered and self-managed real estate investment trust ("REIT") that owns, manages, operates, acquires and repositions office and retail properties in Manhattan and the greater New York metropolitan area.

As of September 30, 2017, our total portfolio contained 10.1 million rentable square feet of office and retail space. We owned 14 office properties (including three long-term ground leasehold interests) encompassing approximately 9.4 million rentable square feet of office space. Nine of these properties are located in the midtown Manhattan market and aggregate approximately 7.6 million rentable square feet of office space, including the Empire State Building. Our Manhattan office properties also contain an aggregate of 494,935 rentable square feet of retail space on their ground floor and/or contiguous levels. Our remaining five office properties are located in Fairfield County, Connecticut and Westchester County, New York, encompassing in the aggregate approximately 1.9 million rentable square feet. The majority of square footage for these five properties is located in densely populated metropolitan communities with immediate access to mass transportation. Additionally, we have entitled land at the Stamford Transportation Center in Stamford, Connecticut, adjacent to one of our office properties, that will support the development of an approximately 380,000 rentable square foot office building and garage, which we refer to herein as Metro Tower. As of September 30, 2017, our portfolio included four standalone retail properties located in Manhattan and two standalone retail properties located in the city center of Westport, Connecticut, encompassing 204,450 rentable square feet in the aggregate.

We were organized as a Maryland corporation on July 29, 2011 and commenced operations upon completion of our initial public offering and related formation transactions on October 7, 2013. Our operating partnership, Empire State Realty OP, L.P. (the "Operating Partnership"), holds substantially all of our assets and conducts substantially all of our business. As of September 30, 2017, we owned approximately 53.1% of the aggregate operating partnership units in the Operating Partnership. We, as the sole general partner in the Operating Partnership, have responsibility and discretion in the management and control of the Operating Partnership, and the limited partners in the Operating Partnership, in such capacity, have no authority to transact business for, or participate in the management activities of, the Operating Partnership. Accordingly, the Operating Partnership has been consolidated by us. We elected to be taxed as a REIT and operate in a manner that we believe allows us to qualify as a REIT for federal income tax purposes commencing with our taxable year ended December 31, 2013.

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Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

There have been no material changes to the summary of significant accounting policies included in the section entitled "Summary of Significant Accounting Policies" in our December 31, 2016 Annual Report on Form 10-K.

Basis of Quarterly Presentation and Principles of Consolidation

The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”), for interim financial information, and with the rules and regulations of the Securities and Exchange Commission (the "SEC"). Accordingly, certain information and footnote disclosures required by GAAP for complete financial statements have been condensed or omitted in accordance with such rules and regulations. In the opinion of management, all adjustments and eliminations (including intercompany balances and transactions), consisting of normal recurring adjustments, considered necessary for the fair presentation of the financial statements have been included.

    The results of operations for the periods presented are not necessarily indicative of the results that may be expected for the corresponding full years. These financial statements should be read in conjunction with the financial statements and accompanying notes included in the financial statements for the year ended December 31, 2016 contained in our Annual Report on Form 10-K. We do not consider our business to be subject to material seasonal fluctuations, except that our observatory business is subject to tourism seasonality. During the past ten years, approximately 16.0% to 18.0% of our annual observatory revenue was realized in the first quarter, 26.0% to 28.0% was realized in the second quarter, 31.0% to 33.0% was realized in the third quarter and 23.0% to 25.0% was realized in the fourth quarter.

We consolidate entities in which we have a controlling financial interest.  In determining whether we have a controlling financial interest in a partially owned entity and the requirement to consolidate the accounts of that entity, we consider factors such as ownership interest, board representation, management representation, authority to make decisions, and contractual and substantive participating rights of the partners/members.  For variable interest entities ("VIE"), we consolidate the entity if we are deemed to have a variable interest in the entity and through that interest we are deemed the primary beneficiary. The primary beneficiary of a VIE 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. The primary beneficiary is required to consolidate the VIE. The Operating Partnership is a variable interest entity of our company, Empire State Realty Trust, Inc.  As the Operating Partnership is already consolidated in the financial statements of Empire State Realty Trust, Inc., the identification of this entity as a variable interest entity has no impact on our consolidated financial statements.

We will assess the accounting treatment for each investment we may have in the future. This assessment will include a review of each entity’s organizational agreement to determine which party has what rights and whether those rights are protective or participating. For all VIEs, we will review such agreements in order to determine which party has the power to direct the activities that most significantly impact the entity’s economic performance and benefit. In situations where we or our partner could approve, among other things, the annual budget, or leases that cover more than a nominal amount of space relative to the total rentable space at each property, we would not consolidate the investment as we consider these to be substantive participation rights that result in shared power of the activities that would most significantly impact the performance and benefit of such joint venture investment.

A non-controlling interest in a consolidated subsidiary is defined as the portion of the equity (net assets) in a subsidiary not attributable, directly or indirectly, to a parent. Non-controlling interests are required to be presented as a separate component of equity in the condensed consolidated balance sheets and in the condensed consolidated statements of income by requiring earnings and other comprehensive income to be attributed to controlling and non-controlling interests.

Accounting Estimates

The preparation of the condensed consolidated financial statements in accordance with GAAP requires management to use estimates and assumptions that in certain circumstances affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities, and the reported revenues and expenses. Significant items subject to such estimates and assumptions include allocation of the purchase price of acquired real estate properties among tangible and intangible assets, determination of the useful life of real estate properties and other long-lived assets, valuation and impairment analysis of commercial real estate properties and other long-lived assets, estimate of tenant expense reimbursements, valuation of the allowance for doubtful accounts, and valuation of derivative instruments, senior unsecured notes, mortgage notes payable, unsecured term loan and revolving credit facilities, and equity based compensation. These estimates are prepared using management’s best judgment, after considering past, current, and expected events and economic conditions. Actual results could differ from those estimates.

Reclassification

Certain prior year balances have been reclassified to conform to our current year presentation. The prior year balance of interest expense has been reclassified to separately present loss on early extinguishment of debt.

Recently Issued or Adopted Accounting Standards

During August 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, which amends its hedge accounting model to enable entities to better portray their risk management activities in the financial statements. The amendments expand an entity’s ability to hedge nonfinancial and financial risk components and reduce complexity in fair value hedges of interest rate risk. ASU No. 2017-12 eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. It also eases certain documentation and assessment requirements and modifies the accounting for components excluded from the assessment of hedge effectiveness. ASU No. 2017-12 will be effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early application is permitted in any interim period. All transition requirements and elections should be applied to hedging relationships existing on the date of adoption. The effect of adoption should be reflected as of the beginning of the fiscal year of adoption (that is, the initial application date). During the quarter, we early adopted ASU No. 2017-02 using a modified retrospective approach for existing and active hedging relationships as of adoption date. The adoption of ASU No. 2017-02 did not have a material impact on our consolidated financial statements.

During January 2017, the FASB issued ASU No. 2017-04, Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment, which contain amendments that modify the concept of impairment from the condition that exists when the carrying amount of goodwill exceeds its implied fair value to the condition that exists when the carrying amount of a reporting unit exceeds its fair value. An entity no longer will determine goodwill impairment by calculating the implied fair value of goodwill by assigning the fair value of a reporting unit to all of its assets and liabilities as if that reporting unit had been acquired in a business combination. Because these amendments eliminate Step 2 from the goodwill impairment test, they should reduce the cost and complexity of evaluating goodwill for impairment. ASU No. 2017-04 should be applied on a prospective basis and the amendments adopted for the annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

During January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business, which contain amendments to clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The amendments in ASU No. 2017-01 provide a screen to determine when an integrated set of assets and activities (collectively referred to as a “set”) is not a business. The screen requires that when substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. This screen reduces the number of transactions that need to be further evaluated. Real estate acquisitions that do not meet the definition of a business will be accounted for as asset acquisitions and the corresponding acquisition costs will be capitalized rather than expensed. These amendments narrow the definition of the term output so that the term is consistent with how outputs are described in Topic 606, Revenue from Contracts with Customers. ASU No. 2017-01 will be effective for annual periods beginning after December 15, 2017, including interim periods within those periods. The amendments should be applied prospectively on or after the effective date. No disclosures are required at transition. We believe that future acquisitions of real estate properties will be considered asset acquisitions.

During November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, which contain amendments that require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. ASU No. 2016-18 will be effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. The amendments should be applied using a retrospective transition method to each period presented. We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

During August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. ASU No. 2016-15 will be effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Earlier adoption is permitted including adoption in an interim period. We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

During June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which contains amendments that replace the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. ASU No. 2016-13 will be effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Earlier adoption as of the fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, is permitted. The amendments must be adopted through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective (that is, a modified retrospective approach). We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

During February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which requires that a lessee recognize in the statement of financial position a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. ASU No. 2016-02 leaves the accounting for leases by lessors largely unchanged from previous GAAP. ASU No. 2016-02 will be effective for fiscal years beginning after December 15, 2018 and subsequent interim periods. The new standard must be adopted using a modified retrospective transition, and provides for certain practical expedients. Transition will require application of the new guidance at the beginning of the earliest comparative period presented. This ASU is expected to result in the recognition of a right-to-use asset and related liability to account for our future obligations under our ground lease agreements for which we are the lessee. As of September 30, 2017, the remaining contractual payments under our ground lease agreements aggregated $61.7 million. In addition, under ASU 2016-02, lessors may only capitalize incremental direct leasing costs. As a result, we expect that we will no longer capitalize our internal leasing costs and instead will expense these costs as incurred. These costs totaled $2.3 million for the year ended December 31, 2016. We continue to evaluate the impact of adopting this new accounting standard on our consolidated financial statements.

During May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which will replace all current GAAP guidance related to revenue recognition and eliminate all industry-specific guidance. The new revenue recognition standard provides a unified model to determine when and how revenue is recognized. The core principle is that a company should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This guidance can be applied either retrospectively to each period presented or as a cumulative-effect adjustment as of the date of adoption. ASU No. 2014-09 was amended in August 2015 by ASU No. 2015-14 Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, which defers the effective date of ASU No. 2014-09 for all entities by one year. Public business entities, certain not-for-profit entities, and certain employee benefit plans should apply the guidance in ASU No. 2014-09 to annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. Earlier application is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. ASU No. 2014-09 was further amended in December 2016 by ASU No. 2016-20 Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers which contain amendments that are intended to clarify or correct unintended application of the guidance. Those items generally are not expected to have a significant effect on current accounting practice or create a significant administrative cost for most entities. The effective date and transition requirements for the amendments are the same as the effective date and transition requirements for Topic 606. We plan to adopt this standard on the required effective date of January 1, 2018 using the modified retrospective approach and we do not expect the adoption to have a material impact on our consolidated financial statements. This standard excludes from its scope, accounting for leases which is covered by ASU No. 2016-02, Leases. However, the non-lease service components within a lease such as common area maintenance reimbursed by tenants will be considered individual performance obligations and be subject to the new revenue recognition standard, and such revenue will be recognized over the period in which the related services are performed. We expect to apply the new revenue guidance to non-lease components within tenant leases upon our adoption of the lease standard effective January 1, 2019.

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Deferred Costs, Acquired Lease Intangibles and Goodwill

9 Months Ended

Sep. 30, 2017

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

Deferred Costs, Acquired Lease Intangibles and Goodwill

Deferred Costs, Acquired Lease Intangibles and Goodwill

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

	September 30, 2017			December 31, 2016
Leasing costs	$	158,780		$	140,325
Acquired in-place lease value and deferred leasing costs	244,829			253,113
Acquired above-market leases	70,290			74,770
	473,899			468,208
Less: accumulated amortization	(214,466		)	(195,617		)
Total deferred costs, net, excluding net deferred financing costs	$	259,433		$	272,591

At September 30, 2017 and December 31, 2016, $8.7 million and $4.5 million, respectively, of net deferred financing costs associated with the unsecured revolving credit facility was included in deferred costs, net on the condensed consolidated balance sheet.    

Amortization expense related to deferred leasing costs and acquired deferred leasing costs was $5.8 million and $6.1 million for the three months ended September 30, 2017 and 2016, respectively, and $17.9 million and $17.6 million for the nine months ended September 30, 2017 and 2016, respectively. Amortization expense related to acquired lease intangibles was $4.0 million and $5.0 million for the three months ended September 30, 2017 and 2016, respectively, and $13.0 million and $19.7 million for the nine months ended September 30, 2017 and 2016, respectively.

Amortizing acquired intangible assets and liabilities consisted of the following as of September 30, 2017 and December 31, 2016 (amounts in thousands):

	September 30, 2017			December 31, 2016
Acquired below-market ground leases	$	396,916		$	396,916
Less: accumulated amortization	(26,729		)	(20,856		)
Acquired below-market ground leases, net	$	370,187		$	376,060

	September 30, 2017			December 31, 2016
Acquired below-market leases	$	(132,723	)	$	(135,026	)
Less: accumulated amortization	62,710			52,726
Acquired below-market leases, net	$	(70,013	)	$	(82,300	)

Rental revenue related to the amortization of below-market leases, net of above-market leases, was $1.6 million and $1.2 million for the three months ended September 30, 2017 and 2016, respectively, and $4.1 million and $6.3 million for the nine months ended September 30, 2017 and 2016, respectively.

As of September 30, 2017, we had goodwill of $491.5 million. Goodwill was allocated $227.5 million to the observatory reportable segment and $264.0 million to the real estate segment.

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Debt

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Debt

Debt

Debt consisted of the following as of September 30, 2017 and December 31, 2016 (amounts in thousands):

	Principal Balance						As of September 30, 2017
	September 30, 2017			December 31, 2016			Stated Rate		Effective Rate(1)		Maturity Date(2)
Mortgage debt collateralized by:
Fixed rate mortgage debt
1333 Broadway	$	66,872		$	67,656		6.32	%	3.73	%	1/5/2018
1400 Broadway
(first lien mortgage loan)	66,909			67,714			6.12	%	3.37	%	2/5/2018
(second lien mortgage loan)	9,226			9,389			3.35	%	3.36	%	2/5/2018
111 West 33rd Street
(first lien mortgage loan)	74,356			75,261			6.01	%	3.32	%	4/5/2018
(second lien mortgage loan)	9,405			9,509			6.56	%	3.62	%	4/5/2018
1350 Broadway	37,302			37,764			5.87	%	3.71	%	4/5/2018
Metro Center	94,464			95,985			3.59	%	3.66	%	11/5/2024
10 Union Square	50,000			50,000			3.70	%	3.97	%	4/1/2026
1542 Third Avenue	30,000			17,795			4.29	%	4.68	%	5/1/2027
First Stamford Place(3)	180,000			235,067			4.28	%	4.67	%	7/1/2027
1010 Third Avenue and 77 West 55th Street	39,885			26,502			4.01	%	4.45	%	1/5/2028
10 Bank Street	34,802			31,544			4.23	%	4.54	%	6/1/2032
383 Main Avenue	30,000			28,654			4.44	%	4.77	%	6/30/2032
Total mortgage debt	723,221			752,840
Senior unsecured notes - exchangeable	250,000			250,000			2.63	%	3.93	%	8/15/2019
Senior unsecured notes:(6)
Series A	100,000			100,000			3.93	%	4.00	%	3/27/2025
Series B	125,000			125,000			4.09	%	4.17	%	3/27/2027
Series C	125,000			125,000			4.18	%	4.26	%	3/27/2030
Unsecured revolving credit facility(6)	—			—			(4)		(4)		8/29/2021
Unsecured term loan facility(6)	265,000			265,000			(5)		(5)		8/29/2022
Total principal	1,588,221			1,617,840
Unamortized premiums, net of unamortized discount	(2,301		)	905
Deferred financing costs, net	(8,630		)	(6,414		)
Total	$	1,577,290		$	1,612,331

______________

(1) The effective rate is the yield as of September 30, 2017, including the effects of debt issuance costs and the amortization of the fair value of debt adjustment.

(2) Pre-payment is generally allowed for each loan upon payment of a customary pre-payment penalty.

(3) Represents a $164 million mortgage loan bearing interest of 4.09% and a $16 million loan bearing interest at 6.25%.

(4) At September 30, 2017, the unsecured revolving credit facility bears a floating rate at 30 day LIBOR plus 1.10%. The rate at September 30, 2017 was 2.33%.

(5) The unsecured term loan facility bears a floating rate at 30 day LIBOR plus 1.20%. Pursuant to a forward interest rate swap agreement, the LIBOR rate is fixed at 2.1485% for the period beginning on August 31, 2017 through maturity. The rate at September 30, 2017 was 3.35%.

(6) At September 30, 2017, we were in compliance with all debt covenants.

Mortgage Debt

During April 2017, we refinanced a mortgage loan collateralized by 1542 Third Avenue. The new $30.0 million loan bears interest at a fixed rate of 4.29% and matures in May 2027.

During May 2017, we refinanced a mortgage loan collateralized by 10 Bank Street. The new $35.0 million loan bears interest at a fixed rate of 4.23% and matures in June 2032.

During June 2017, we refinanced a mortgage loan collateralized by First Stamford Place. The new $180.0 million loans bear a blended interest rate of 4.28% and mature in July 2027. One mortgage loan is for $164.0 million and bears an interest rate of 4.09%. The second loan is for $16.0 million and bears an interest rate of 6.25%.

During June 2017, we refinanced a mortgage loan collateralized by 1010 Third Avenue and 77 West 55th Street. The new $40.0 million loan bears interest at a fixed rate of 4.01% and matures in January 2028.

During June 2017, we refinanced a mortgage loan collateralized by 383 Main Avenue. The new $30.0 million loan bears interest at a fixed rate of 4.44% and matures in June 2032.

Principal Payments

Aggregate required principal payments at September 30, 2017 are as follows (amounts in thousands):

Year	Amortization		Maturities		Total
2017	$	1,983	$	—	$	1,983
2018	4,417		262,210		266,627
2019	3,790		250,000		253,790
2020	3,938		—		3,938
2021	4,090		—		4,090
Thereafter	43,407		1,014,386		1,057,793
Total	$	61,625	$	1,526,596	$	1,588,221

Deferred Financing Costs

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

	September 30, 2017			December 31, 2016
Financing costs	$	23,333		$	23,145
Less: accumulated amortization	(6,004		)	(12,241		)
Total deferred financing costs, net	$	17,329		$	10,904

At September 30, 2017 and December 31, 2016, $8.7 million and $4.5 million, respectively, of net deferred financing costs associated with the unsecured revolving credit facility was included in deferred costs, net on the condensed consolidated balance sheet.

Amortization expense related to deferred financing costs was $1.0 million and $1.3 million for the three months ended September 30, 2017 and 2016, respectively, and $3.6 million and $3.7 million for the nine months ended September 30, 2017 and 2016, respectively, and was included in interest expense.

Unsecured Revolving Credit and Term Loan Facility

During August 2017, through the Operating Partnership, we entered into an amended and restated senior unsecured revolving credit and term loan facility (the “Facility”) with Bank of America, N.A., as administrative agent, Merrill Lynch, Pierce, Fenner & Smith Incorporated and Wells Fargo Securities, LLC as Joint Lead Arrangers and Joint Bookrunners, Wells Fargo, National Association and Capital One, National Association, as co-syndication agents, and the lenders party thereto. The Facility amended and restated the credit facility dated as of January 23, 2015, with Bank of America, N.A., Merrill Lynch, Goldman Sachs and the other lenders party thereto. In connection with the modification of the credit facility and term loan, we incurred a loss on early extinguishment of debt of $2.2 million which is reflected in our condensed consolidated statement of income for the nine months ended September 30, 2017. This transaction extended the unsecured revolving credit facility maturity, lowered borrowing costs and added flexibility to the financial covenants.

The Facility is in the original principal amount of up to $1.365 billion, which consists of a $1.1 billion revolving credit facility and a $265 million term loan facility. The new revolving credit facility replaced a credit facility which was due to mature in January 2019 and was undrawn as of September 30, 2017. The term loan facility was borrowed in full at closing and used to repay a $265 million term loan that had been due in 2022. We may request the Facility be increased through one or more increases in the revolving credit facility or one or more increases in the term loan facility or the addition of new pari passu term loan tranches, for a maximum aggregate principal amount not to exceed $1.75 billion.

The initial maturity of the unsecured revolving credit facility is August 2021. We have the option to extend the initial term for up to two additional 6-month periods, subject to certain conditions, including the payment of an extension fee equal to 0.0625% and 0.075% of the then outstanding commitments under the unsecured revolving credit facility on the first and the second extensions, respectively. The term loan facility matures on August 2022. We may prepay the loans under the Facility at any time, subject to reimbursement of the lenders’ breakage and redeployment costs in the case of prepayment of Eurodollar Rate borrowings.

Exchangeable Senior Notes

Issued in August 2014, the $250.0 million2.625% Exchangeable Senior Notes (“2.625% Exchangeable Senior Notes”) are due August 15, 2019. The 2.625% Exchangeable Senior Notes will be exchangeable into cash, shares of Class A common stock or a combination of cash and shares of Class A common stock, at our election. We have asserted that it is our intent and ability to settle the principal amount of the 2.625% Exchangeable Senior Notes in cash. As of September 30, 2017, the exchange rate of the 2.625% Exchangeable Senior Notes was 51.7101 shares per $1,000 principal amount of notes (equivalent to an initial exchange price of approximately $19.34 per share of Class A common stock), subject to adjustment, as described in the related indenture governing the 2.625% Exchangeable Senior Notes.

For the three and nine months endedSeptember 30, 2017, total interest expense related to the 2.625% Exchangeable Senior Notes was $2.4 million and $7.3 million, respectively, consisting of (i) the contractual interest expense of $1.6 million and $4.9 million, respectively, (ii) the additional non-cash interest expense of $0.7 million and $2.0 million, respectively, relating to the accretion of the debt discount, and (iii) the amortization of deferred financing costs of $0.1 million and $0.4 million, respectively. For the three and nine months endedSeptember 30, 2016, total interest expense related to the 2.625% Exchangeable Senior Notes was $2.4 million and $7.3 million, respectively, consisting of (i) the contractual interest expense of $1.6 million and $4.9 million, respectively, (ii) the additional non-cash interest expense of $0.7 million and $2.0 million, respectively, relating to the accretion of the debt discount, and (iii) the amortization of deferred financing costs of $0.1 million and $0.4 million, respectively.

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Accounts Payable and Accrued Expenses

9 Months Ended

Sep. 30, 2017

Payables and Accruals [Abstract]

Accounts Payable and Accrued Expenses

Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses consist of the following as of September 30, 2017 and December 31, 2016 (amounts in thousands):

	September 30, 2017		December 31, 2016
Accounts payable and accrued expenses	$	106,420	$	102,866
Payable to the estate of Leona M. Helmsley (1)	18,367		18,367
Interest rate swap agreements liability	13,378		5,591
Accrued interest payable	3,903		6,230
Due to affiliated companies	622		1,010
Accounts payable and accrued expenses	$	142,690	$	134,064

___________

(1) Reflects a payable to the estate of Leona M. Helmsley, as required under our formation agreements, for New York City transfer taxes which would have been payable in absence of the estate's exemption from such tax. The taxing authority's final approval of such exemption was issued during the three months ended September 30, 2017, and upon receipt of the confirming documents we made this payment to the estate of Leona M. Helmsley on October 2, 2017.

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Financial Instruments and Fair Values

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Financial Instruments and Fair Values

Financial Instruments and Fair Values

Derivative Financial Instruments

We use derivative financial instruments primarily to manage interest rate risk and such derivatives are not considered speculative. These derivative instruments are typically in the form of interest rate swap and forward agreements and the primary objective is to minimize interest rate risks associated with investing and financing activities. The counterparties of these arrangements are major financial institutions with which we may also have other financial relationships. We are exposed to credit risk in the event of non-performance by these counterparties; however, we currently do not anticipate that any of the counterparties will fail to meet their obligations.

We have agreements with our derivative counterparties that contain a provision where if we either default or are capable of being declared in default on any of our indebtedness, then we could also be declared in default on our derivative obligations. As of September 30, 2017, the fair value of derivatives in a net liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was $13.4 million. If we had breached any of these provisions at September 30, 2017, we could have been required to settle our obligations under the agreements at their termination value of $13.4 million.

As of September 30, 2017, we had interest rate LIBOR swaps with an aggregate notional value of $790.0 million. The notional value does not represent exposure to credit, interest rate or market risks. As of September 30, 2017, the fair value of these derivative instruments amounted to ($13.4 million) which is included in accounts payable and accrued expenses on the condensed consolidated balance sheet. As of December 31, 2016, the fair value of these derivative instruments amounted to $0.6 million which was included in prepaid expenses and other assets and ($5.6 million) which was included in accounts payable and accrued expenses on the condensed consolidated balance sheet. These interest rate swaps have been designated as cash flow hedges and hedge the future cash outflows on our mortgage debt and also on our term loan facility that is subject to a floating interest rate. As of September 30, 2017 and 2016, these cash flow hedges are deemed highly effective and a net unrealized gain (loss) of $(1.6) million and $0.9 million for the three months ended September 30, 2017 and 2016, respectively, and a net unrealized gain (loss) of $(14.7) million and $(29.3) million for the nine months ended September 30, 2017 and 2016, respectively, are reflected in the condensed consolidated statements of comprehensive income (loss). Amounts reported in accumulated other comprehensive income (loss) related to derivatives will be reclassified to interest expense as interest payments are made on the debt. We estimate that $2.9 million of the current balance held in accumulated other comprehensive income (loss) will be reclassified into interest expense within the next 12 months relating to the interest rate swap contracts in effect as of September 30, 2017.

The table below summarizes the terms of agreements and the fair values of our derivative financial instruments as of September 30, 2017 and December 31, 2016 (dollar amounts in thousands):     

							September 30, 2017					December 31, 2016
Derivative	Notional Amount		Receive Rate	Pay Rate	Effective Date	Expiration Date	Asset		Liability			Asset		Liability
Interest rate swap	$	265,000	1 Month LIBOR	2.1485%	August 31, 2017	August 24, 2022	$	—	$	(3,436	)	$	—	$	(1,634	)
Interest rate swap (1)	100,000		3 Month LIBOR	2.5050%	July 5, 2017	July 5, 2027	—		—			—		(684		)
Interest rate swap (1) (2)	80,000		3 Month LIBOR	2.5050%	July 5, 2017	July 5, 2027	—		—			—		(685		)
Interest rate swap	100,000		3 Month LIBOR	2.4860%	January 5, 2018	January 5, 2028	—		(1,448		)	224		—
Interest rate swap	100,000		3 Month LIBOR	2.4860%	January 5, 2018	January 5, 2028	—		(1,448		)	223		—
Interest rate swap	75,000		3 Month LIBOR	2.4860%	January 5, 2018	January 5, 2028	—		(1,086		)	167		—
Interest rate swap	75,000		3 Month LIBOR	2.7620%	June 1, 2018	June 1, 2028	—		(2,592		)	—		(1,295		)
Interest rate swap	75,000		3 Month LIBOR	2.7620%	June 1, 2018	June 1, 2028	—		(2,591		)	—		(1,293		)
Interest rate swap	100,000		3 Month LIBOR	2.4625%	June 1, 2018	June 1, 2028	—		(777		)	—		—
							$	—	$	(13,378	)	$	614	$	(5,591	)

(1) During June 2017, these swaps aggregating $180.0 million were terminated in connection with the refinancing of several of our mortgage debt (see Note 4 Debt). As of September 30, 2017, the deferred net losses from these terminated hedges amounted to $5.9 million which is included in accumulated other comprehensive loss relating to net unrealized loss from derivative financial instruments.

(2) During March 2017, $20.0 million of an original notional amount of $100.0 million was terminated. In connection with the partial termination and re-designation of the related cash flow hedges, $0.3 million is recognized as a loss from derivative financial instruments and included in Other Expenses on the condensed consolidated statement of income for the nine months ended September 30, 2017. There was no loss from derivative financial instruments for the three months ended September 30, 2017 and for the three and nine months ended September 30, 2016.

The table below shows the effect of our derivative financial instruments designated as cash flow hedges on accumulated other comprehensive income (loss) for the three and nine months endedSeptember 30, 2017 and 2016 (amounts in thousands):    

	Three Months Ended					Nine Months Ended
Effects of Cash Flow Hedges	September 30, 2017			September 30, 2016		September 30, 2017			September 30, 2016
Amount of gain (loss) recognized in other comprehensive income (loss)	$	(1,638	)	$	930	$	(14,654	)	$	(29,305	)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense	(359		)	—		(402		)	—

The table below shows the effect of our derivative financial instruments designated as cash flow hedges on the condensed consolidated income statements for the three and nine months endedSeptember 30, 2017 and 2016 (amounts in thousands):

	Three Months Ended						Nine Months Ended
Effects of Cash Flow Hedges	September 30, 2017			September 30, 2016			September 30, 2017			September 30, 2016
Total interest (expense) presented in the condensed consolidated income statements in which the effects of cash flow hedges are recorded	$	(16,890	)	$	(17,939	)	$	(52,109	)	$	(52,758	)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense	(359		)	—			(402		)	—

Fair Valuation

The estimated fair values at September 30, 2017 and December 31, 2016 were determined by management, using available market information and appropriate valuation methodologies. Considerable judgment is necessary to interpret market data and develop estimated fair value. Accordingly, the estimates presented herein are not necessarily indicative of the amounts we could realize on disposition of the financial instruments. The use of different market assumptions and/or estimation methodologies may have a material effect on the estimated fair value amounts.

The fair value of our senior unsecured notes - Exchangeable was derived from quoted prices in active markets and is classified as Level 2 since trading volumes are low.

The fair value of derivative instruments is determined using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. Although the majority of the inputs used to value our derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with our derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by ourselves and our counterparties. The impact of such credit valuation adjustments, determined based on the fair value of each individual contract, was not significant to the overall valuation. As a result, all of our derivatives were classified as Level 2 of the fair value hierarchy.

The fair value of our mortgage notes payable, senior unsecured notes - Series A, B and C, and unsecured term loan facility which are determined using Level 3 inputs, are estimated by discounting the future cash flows using current interest rates at which similar borrowings could be made to us.

The following tables summarize the carrying and estimated fair values of our financial instruments as of September 30, 2017 and December 31, 2016 (amounts in thousands):

	September 30, 2017
			Estimated Fair Value
	Carrying Value		Total		Level 1		Level 2		Level 3
Interest rate swaps included in prepaid expenses and other assets	$	—	$	—	$	—	$	—	$	—
Interest rate swaps included in accounts payable and accrued expenses	13,378		13,378		—		13,378		—
Mortgage notes payable	720,830		712,365		—		—		712,365
Senior unsecured notes - Exchangeable	243,923		281,068		—		281,068		—
Senior unsecured notes - Series A, B, and C	348,991		344,267		—		—		344,267
Unsecured term loan facility	263,546		265,000		—		—		265,000

	December 31, 2016
			Estimated Fair Value
	Carrying Value		Total		Level 1		Level 2		Level 3
Interest rate swaps included in prepaid expenses and other assets	$	614	$	614	$	—	$	614	$	—
Interest rate swaps included in accounts payable and accrued expenses	5,591		5,591		—		5,591		—
Mortgage notes payable	759,016		755,640		—		—		755,640
Senior unsecured notes - Exchangeable	241,474		282,435		—		282,435		—
Senior unsecured notes - Series A, B, and C	348,914		339,274		—		—		339,274
Unsecured term loan facility	262,927		265,000		—		—		265,000

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

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Rental Income

9 Months Ended

Sep. 30, 2017

Leases [Abstract]

Rental Income

Rental Income

We lease various office spaces to tenants over terms ranging from one to 16 years. Certain leases have renewal options for additional terms. The leases provide for base monthly rentals and reimbursements for real estate taxes, escalations linked to the consumer price index or common area maintenance known as operating expense escalation. Operating expense reimbursements are reflected in our condensed consolidated statements of income as tenant expense reimbursement.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Legal Proceedings

Except as described below, as of September 30, 2017, we were not involved in any material litigation, nor, to our knowledge, was any material litigation threatened against us or our properties, other than routine litigation arising in the ordinary course of business such as disputes with tenants. We believe that the costs and related liabilities, if any, which may result from such actions will not materially affect our condensed consolidated financial position, operating results or liquidity.

As previously disclosed, on or about October 14, 2014, 12 former investors in Empire State Building Associates L.L.C. (“ESBA”), which prior to the initial public offering of our company, (the "Offering"), owned the fee title to the Empire State Building, filed an arbitration with the American Arbitration Association against Peter L. Malkin, Anthony E. Malkin, Thomas N. Keltner, Jr., and our subsidiary ESRT MH Holdings LLC, the former supervisor of ESBA, as respondents. The statement of claim alleges breach of fiduciary duty and related claims in connection with the Offering and formation transactions. These investors had opted out of a prior class action brought regarding the Offering and formation transactions that was settled with court approval. The statement of claim in the arbitration seeks monetary damages and declaratory relief. The respondents filed an answering statement and counterclaims. On December 18, 2014, these claimants also filed a complaint in the United States District Court for the Southern District of New York alleging the same claims that they asserted in the arbitration. As alleged in the complaint, the claimants filed this lawsuit to toll the statute of limitations on their claims in the event it is determined that the claims are not subject to arbitration, and they planned to move to stay the lawsuit in favor of the pending arbitration. On February 2, 2015, the claimants filed an amended complaint adding an additional claim and making other non-substantive modifications to the original complaint. On March 12, 2015, the court stayed the action on consent of all parties pending the arbitration. The arbitration hearings commenced in May 2016 and have proceeded for a select number of hearing sessions since that time. Additional hearing sessions are scheduled to resume in November and December 2017.

The respondents believe the allegations in the arbitration are entirely without merit, and they intend to defend them vigorously.

    In connection with the Offering and formation transactions, we entered into indemnification agreements with our directors, executive officers and chairman emeritus, providing for the indemnification by us for certain liabilities and expenses incurred as a result of actions brought, or threatened to be brought, against them. As a result, Anthony E. Malkin, Peter L. Malkin and Thomas N. Keltner, Jr. have defense and indemnity rights from us with respect to the above-referenced arbitration.

Unfunded Capital Expenditures

At September 30, 2017, we estimate that we will incur approximately $78.2 million of capital expenditures (including tenant improvements and leasing commissions) on our properties pursuant to existing lease agreements. We expect to fund these capital expenditures with operating cash flow, additional property level mortgage financings, our unsecured credit facility, cash on hand and other borrowings. Future property acquisitions may require substantial capital investments for refurbishment and leasing costs. We expect that these financing requirements will be met in a similar fashion.

Ground Leases

Aggregate required payments on ground leases at September 30, 2017 were as follows (amounts in thousands):

2017	$	380
2018	1,518
2019	1,518
2020	1,518
2021	1,518
Thereafter	55,212
	$	61,664

Concentration of Credit Risk

Financial instruments that subject us to credit risk consist primarily of cash and cash equivalents, restricted cash, tenant and other receivables and deferred rent receivables. At September 30, 2017, we held on deposit at various major financial institutions cash and cash equivalents and restricted cash balances in excess of amounts insured by the Federal Deposit Insurance Corporation.

Asset Retirement Obligations

We are required to accrue costs that we are legally obligated to incur on retirement of our properties which result from acquisition, construction, development and/or normal operation of such properties. Retirement includes sale, abandonment or disposal of a property. Under that standard, a conditional asset retirement obligation represents a legal obligation to perform an asset retirement activity in which the timing and/or method of settlement is conditional on a future event that may or may not be within a company’s control and a liability for a conditional asset retirement obligation must be recorded if the fair value of the obligation can be reasonably estimated. Environmental site assessments and investigations have identified asbestos or asbestos-containing building materials in certain of our properties. As of September 30, 2017, management has no plans to remove or alter these properties in a manner that would trigger federal and other applicable regulations for asbestos removal, and accordingly, the obligations to remove the asbestos or asbestos-containing building materials from these properties have indeterminable settlement dates. As such, we are unable to reasonably estimate the fair value of the associated conditional asset retirement obligation. However, ongoing asbestos abatement, maintenance programs and other required documentation are carried out as required and related costs are expensed as incurred.

Other Environmental Matters

Certain of our properties have been inspected for soil contamination due to pollutants, which may have occurred prior to our ownership of these properties or subsequently in connection with its development and/or its use. Required remediation to such properties has been completed, and as of September 30, 2017, management believes that there are no obligations related to environmental remediation other than maintaining the affected sites in conformity with the relevant authority’s mandates and filing the required documents. All such maintenance costs are expensed as incurred. We expect that resolution of the environmental matters relating to the above will not have a material impact on our business, assets, consolidated financial condition, results of operations or liquidity. However, we cannot be certain that we have identified all environmental liabilities at our properties, that all necessary remediation actions have been or will be undertaken at our properties or that we will be indemnified, in full or at all, in the event that such environmental liabilities arise.

Insurance Coverage

We carry insurance coverage on our properties of types and in amounts with deductibles that we believe are in line with coverage customarily obtained by owners of similar properties.

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Equity

9 Months Ended

Sep. 30, 2017

Equity [Abstract]

Equity

Equity

During 2016, Q REIT Holding LLC, a Qatar Financial Centre limited liability company and a wholly owned

subsidiary of the Qatar Investment Authority, a governmental authority of the State of Qatar (“QREIT”, together with any eligible transferee, “QIA”) purchased 29,610,854 newly issued Class A common shares at $21.00 per share, equivalent to a 9.9% economic interest in us on a fully diluted basis (representing a 19.4% ownership of Class A common shares). However, QIA can only vote shares equivalent to 9.9% of all voting securities, with the balance of their shares to be voted by us in accord with the votes of all other voting securities. We received approximately $621.8 million in gross proceeds from the sale. QIA has a top-up right to acquire a pro rata number of additional shares from us in the future should we issue new shares to third parties.

In connection with the share issuance to QIA, we agreed, subject to certain minimum thresholds and conditions, to indemnify QIA for certain applicable U.S. federal and state taxes paid by QIA in connection with any dividends we pay that are attributable to capital gains from the sale or exchange of any U.S. real property interests. If we were to trigger our tax indemnification obligations under this agreement, we would be required to pay QIA for the resulting tax consequences, as applicable.

Shares and Units

An operating partnership unit of the Operating Partnership ("OP Unit") and a share of our common stock have essentially the same economic characteristics as they receive the same per unit profit distributions of the Operating Partnership. On the one-year anniversary of issuance, an OP Unit may be tendered for redemption for cash; however, we have sole and absolute discretion, and sufficient authorized common stock, to exchange OP Units for shares of common stock on a one-for-one basis instead of cash.

Long-term incentive plan ("LTIP") units are a special class of partnership interests in the Operating Partnership. Each LTIP unit awarded will be deemed equivalent to an award of one share of stock under the First Amended and Restated Empire State Realty Trust, Inc. and Empire State Realty OP, L.P. 2013 Equity Incentive Plan ("2013 Plan"), reducing the availability for other equity awards on a one-for-one basis. The vesting period for LTIP units, if any, will be determined at the time of issuance. Under the terms of the LTIP units, the Operating Partnership will revalue for tax purposes its assets upon the occurrence of certain specified events, and any increase in valuation from the time of grant until such event will be allocated first to the holders of LTIP units to equalize the capital accounts of such holders with the capital accounts of OP unitholders. Subject to any agreed upon exceptions, once vested and having achieved parity with OP unitholders, LTIP units are convertible into OP Units in the Operating Partnership on a one-for-one basis.

With the exception of performance based LTIP units granted in 2016 and 2017, all LTIP units issued in connection with annual equity awards, whether vested or not, receive the same per unit distributions as OP units, which equal per share dividends (both regular and special) on our common stock. Performance based LTIP units granted in 2016 and 2017 receive 10% of such distributions currently, unless and until such LTIP units are earned based on performance, at which time they will receive the accrued and unpaid 90% and will commence receiving 100% of such distributions thereafter.

The following is net income attributable to common stockholders and the issuance of our Class A shares in exchange for the conversion of OP Units into common stock (amounts in thousands):

	Three Months Ended				Nine Months Ended
	September 30, 2017		September 30, 2016		September 30, 2017		September 30, 2016
Net income attributable to common stockholders	$	18,806	$	15,973	$	45,375	$	34,490
Increase in additional paid-in capital for the conversion of OP Units into common stock	1,953		5,016		11,087		20,217
Change from net income attributable to common stockholders and transfers from non-controlling interests	$	20,759	$	20,989	$	56,462	$	54,707

As of September 30, 2017, there were 300,416,821 OP Units outstanding, of which 159,427,448, or 53.1%, were owned by us and 140,989,373, or 46.9%, were owned by other partners, including certain directors, officers and other members of executive management.

Dividends and Distributions

Total dividends paid to common stockholders were $16.7 million and $49.8 million for the three and nine months ended September 30, 2017, respectively, and $16.2 million and $39.5 million for the three and nine months ended September 30, 2016, respectively. Total distributions paid to OP unitholders, excluding inter-company distributions, were $14.8 million and $44.6 million for the three and nine months ended September 30, 2017, respectively, and $15.1 million and $43.1 million for the three and nine months ended September 30, 2016, respectively. Total distributions paid to preferred unitholders were $0.2 million and $0.7 million for the three and nine months ended September 30, 2017, respectively, and $0.2 million and $0.7 million for the three and nine months ended September 30, 2016, respectively.

Incentive and Share-Based Compensation

The 2013 Plan provides for grants to directors, employees and consultants consisting of stock options, restricted stock, dividend equivalents, stock payments, performance shares, LTIP units, stock appreciation rights and other incentive awards. An aggregate of 12.2 million shares of our common stock is authorized for issuance under awards granted pursuant to the 2013 Plan, and as of September 30, 2017, 7.0 million shares of common stock remain available for future issuance.

In March 2017, we made grants of LTIP units to executive officers under the 2013 Plan. At such time, we granted to executive officers a total of 313,275 LTIP units that are subject to time-based vesting and 865,742 LTIP units that are subject to performance-based vesting, with fair market values of $6.1 million for the time-based vesting awards and $9.6 million for the performance-based vesting awards. In March 2017, we made grants of LTIP units and restricted stock to certain other employees under the 2013 Plan. At such time, we granted to certain other employees a total of 47,993 LTIP units and 34,407 shares of restricted stock that are subject to time-based vesting and 95,156 LTIP units that are subject to performance-based vesting, with fair market values of $1.6 million for the time-based vesting awards and $1.0 million for the performance-based vesting awards. The awards subject to time-based vesting vest ratably over four years from January 1, 2017, subject generally to the grantee's continued employment. The first installment vests on January 1, 2018 and the remainder will vest thereafter in three equal annual installments. The vesting of the LTIP units subject to performance-based vesting is based on the achievement of absolute and relative total stockholder return hurdles over a three-year performance period, commencing on January 1, 2017. Following the completion of the three-year performance period, our compensation committee will determine the number of LTIP units to which the grantee is entitled based on our performance relative to the performance hurdles set forth in the LTIP unit award agreements the grantee entered into in connection with the award grant. These units then vest in two installments, with the first installment vesting on January 1, 2020 and the second installment vesting on January 1, 2021, subject generally to the grantee's continued employment on those dates.

In May 2017, we made grants of LTIP units to our non-employee directors under the 2013 Plan. At such time, we granted a total of 50,408 LTIP units that are subject to time-based vesting with fair market values of $1.0 million. The awards vest ratably over three years from the date of the grant, subject generally to the director's continued service on our Board of Directors.

In February 2016, we made grants of LTIP units to executive officers under the 2013 Plan. At such time, we granted to executive officers a total of 368,225 LTIP units that are subject to time-based vesting and 1,230,228 LTIP units that are subject to performance-based vesting, with fair market values of $5.6 million for the time-based vesting awards and $8.8 million for the performance-based vesting awards. In February 2016, we made grants of LTIP units and restricted stock to certain other employees under the 2013 Plan. At such time, we granted to certain other employees a total of 47,168 LTIP units and 44,198 shares of restricted stock that are subject to time-based vesting and 112,925 LTIP units that are subject to performance-based vesting, with fair market values of $1.4 million for the time-based vesting awards and $0.8 million for the performance-based vesting awards. The awards subject to time-based vesting vest ratably over four years from January 1, 2016, subject generally to the grantee's continued employment. The first installment vested on January 1, 2017 and the remainder will vest thereafter in three equal annual installments. The vesting of the LTIP units subject to performance-based vesting is based on the achievement of absolute and relative total stockholder return hurdles over a three-year performance period, commencing on January 1, 2016. Following the completion of the three-year performance period, our compensation committee will determine the number of LTIP units to which the grantee is entitled based on our performance relative to the performance hurdles set forth in the LTIP unit award agreements the grantee entered into in connection with the award grant. These units then vest in two installments, with the first installment vesting on January 1, 2019 and the second installment vesting on January 1, 2020, subject generally to the grantee's continued employment on those dates.

In February 2016, we made a grant of LTIP units to an executive officer under the 2013 Plan. We granted a total of 62,814 LTIP units with a fair market value of $1.0 million. The award is subject to time-based vesting of 30% after three years, 30% after four years, and 40% after five years, subject to the grantee's continued employment.

In June 2016, we made grants of LTIP units to our non-employee directors under the 2013 Plan. At such time, we granted a total of 43,257 LTIP units that are subject to time-based vesting with fair market values of $0.8 million. The awards vest ratably over three years from the date of the grant, subject generally to the director's continued service on our Board of Directors.

We made other grants during 2016 under the 2013 Plan with fair market values of $0.1 million in the aggregate.

Share-based compensation is measured at the fair value of the award on the date of grant and recognized as an expense on a straight-line basis over the vesting period. For the performance-based LTIP units and restricted stock awards, the fair value of the awards was estimated using a Monte Carlo Simulation model.  Our stock price, along with the prices of the comparative indexes, is assumed to follow the Geometric Brownian Motion Process.  Geometric Brownian Motion is a common assumption when modeling in financial markets, as it allows the modeled quantity (in this case the stock price) to vary randomly from its current value and take any value greater than zero.  The volatilities of the returns on our stock price and the comparative indexes were estimated based on implied volatilities and historical volatilities using a six-year look-back period.  The expected growth rate of the stock prices over the performance period is determined with consideration of the risk free rate as of the grant date.  For LTIP unit awards that are time-based, the fair value of the awards was estimated based on the fair value of our stock at the grant date discounted for the restriction period during which the LTIP units cannot be redeemed or transferred and the uncertainty regarding if, and when, the book capital account of the LTIP units will equal that of the common units.  For restricted stock awards that are time-based, we estimate the stock compensation expense based on the fair value of the stock at the grant date.

LTIP units and restricted stock issued during the nine months endedSeptember 30, 2017 and 2016 were valued at $19.4 million and $18.4 million, respectively. The weighted-average per unit or share fair value was $13.77 and $9.60 for grants issued in 2017 and 2016, respectively. The per unit or share granted in 2017 was estimated on the respective dates of grant using the following assumptions: an expected life of 2.8 years, a dividend rate of 2.05%, a risk-free interest rate of 1.55%, and an expected price volatility of 20.0%. The per unit or share granted in 2016 was estimated on the respective dates of grant using the following assumptions: an expected life of 2.8 years, a dividend rate of 2.10%, a risk-free interest rate of 0.84% and an expected price volatility of 24.0%.

No other stock options, dividend equivalents, or stock appreciation rights were issued or outstanding in 2017.

The following is a summary of restricted stock and LTIP unit activity for the nine months endedSeptember 30, 2017:

	Restricted Stock		LTIP Units		Weighted Average Grant Fair Value
Unvested balance at December 31, 2016	107,793		2,881,629		$	10.01
Vested	(17,923	)	(323,982	)	13.74
Granted	34,407		1,372,574		13.77
Forfeited or unearned	(2,509	)	(77,227	)	5.36
Unvested balance at September 30, 2017	121,768		3,852,994		$	11.11

The LTIP unit and restricted stock awards will immediately vest upon the later of (i) the date the grantee attains the age of 60 and (ii) the date on which grantee has first completed ten years of continuous service with our company or its affiliates. For award agreements that qualify, we recognize noncash compensation expense on the grant date for the time-based awards and ratably over the vesting period for the performance-based awards, and accordingly, we recognized $0.2 million and $0.9 million for the three and nine months ended September 30, 2017, respectively, and $0.1 million and $0.6 million for the three and nine months ended September 30, 2016, respectively. Unrecognized compensation expense was $0.9 million at September 30, 2017, which will be recognized over a weighted average period of 2.4 years.

For the remainder of the LTIP unit and restricted stock awards, we recognize noncash compensation expense ratably over the vesting period, and accordingly, we recognized noncash compensation expense of $3.7 million and $9.9 million for the three and nine months endedSeptember 30, 2017, respectively, and $2.5 million and $6.7 million for the three and nine months ended September 30, 2016, respectively. Unrecognized compensation expense was $26.5 million at September 30, 2017, which will be recognized over a weighted average period of 2.5 years.

Earnings Per Share

Earnings per share for the three and nine months ended September 30, 2017 and 2016 is computed as follows (amounts in thousands, except per share amounts):

	Three Months Ended,						Nine Months Ended,
	September 30, 2017			September 30, 2016			September 30, 2017			September 30, 2016
Numerator - Basic:
Net income	$	35,489		$	32,897		$	85,993		$	74,242
Private perpetual preferred unit distributions	(234		)	(234		)	(702		)	(702		)
Net income attributable to non-controlling interests	(16,449		)	(16,690		)	(39,916		)	(39,050		)
Earnings allocated to unvested shares	(11		)	(11		)	(28		)	(27		)
Net income attributable to common stockholders - basic	$	18,795		$	15,962		$	45,347		$	34,463
Numerator - Diluted:
Net income	$	35,489		$	32,897		$	85,993		$	74,242
Private perpetual preferred unit distributions	(234		)	(234		)	(702		)	(702		)
Earnings allocated to unvested shares	(11		)	(11		)	(28		)	(27		)
Net income attributable to common stockholders - diluted	$	35,244		$	32,652		$	85,263		$	73,513
Denominator:
Weighted average shares outstanding - basic	158,102			136,831			157,796			126,740
Operating partnership units	138,287			141,908			138,593			143,648
Effect of dilutive securities:
Stock-based compensation plans	762			1,090			848			378
Exchangeable senior notes	720			785			852			262
Weighted average shares outstanding - diluted	297,871			280,614			298,089			271,028
Earnings per share:
Basic	$	0.12		$	0.12		$	0.29		$	0.27
Diluted	$	0.12		$	0.12		$	0.29		$	0.27

There were 954,533 and 840,092 antidilutive shares and LTIP units for the three and nine months ended September 30, 2017, respectively, and 1,033,044 and 757,119 antidilutive shares and LTIP units for the three and nine months ended September 30, 2016, respectively.

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Related Party Transactions

9 Months Ended

Sep. 30, 2017

Related Party Transactions [Abstract]

Related Party Transactions

Related Party Transactions

Supervisory Fee Revenue

We earned supervisory fees from entities affiliated with Anthony E. Malkin, our Chairman and Chief Executive Officer, of $0.3 million and $0.3 million for the three months ended September 30, 2017 and 2016, respectively, and $0.9 million and $1.1 million for the nine months ended September 30, 2017 and 2016, respectively. These fees are included within third-party management and other fees.

Property Management Fee Revenue

We earned property management fees from entities affiliated with Anthony E. Malkin of $0.1 million and $0.1 million for the three months ended September 30, 2017 and 2016, respectively, and $0.2 million and $0.3 million for the nine months ended September 30, 2017 and 2016, respectively. These fees are included within third-party management and other fees.

Other

We were reimbursed at allocable cost for 647 square feet of shared office space, equipment, and administrative support, as was done prior to our formation, and we received rent generally at market rental rate for 3,074 square feet of leased space, from entities affiliated with Anthony E. Malkin, at one of our properties aggregating $0.07 million and $0.2 million for the three and nine months ended September 30, 2016, respectively.

During August 2016, such entities moved from the previously shared office and leased spaces to relocate to a new 5,351 square foot leased space at one of our properties, paying rent generally at a market rental rate. Under such new lease, the tenant has the right to cancel such lease without special payment on 90 days’ notice. We now have a shared use agreement with such tenant, to occupy a portion of the leased premises as the office location for Peter L. Malkin, our chairman emeritus and employee, utilizing approximately 15% of the space, for which we pay an allocable pro rata share of the cost to such tenant. We also have agreements with these entities to provide them with general computer-related support. Total revenue aggregated $0.1 million and $0.3 million for the three and nine months ended September 30, 2017, respectively.

One of our directors, James D. Robinson IV, is a general partner in an investment fund, which owns more than a 10% economic and voting interest in one of our tenants, OnDeck Capital, with an annualized rent of $5.8 million and $5.7 million as of September 30, 2017 and 2016, respectively.

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Segment Reporting

9 Months Ended

Sep. 30, 2017

Segment Reporting [Abstract]

Segment Reporting

Segment Reporting

We have identified two reportable segments: (1) real estate and (2) observatory. Our real estate segment includes all activities related to the ownership, management, operation, acquisition, redevelopment, repositioning and disposition of our real estate assets. Our observatory segment includes the operation of the 86th and 102nd floor observatories at the Empire State Building. These two lines of businesses are managed separately because each business requires different support infrastructures, provides different services and has dissimilar economic characteristics such as investments needed, stream of revenues and marketing strategies. We account for intersegment sales and rent as if the sales or rent were to third parties, that is, at current market prices.

The following tables provide components of segment profit for each segment for the three and nine months endedSeptember 30, 2017 and 2016 (amounts in thousands):

	Three Months Ended September 30, 2017
	Real Estate			Observatory			Intersegment Elimination			Total
Revenues:
Rental revenue	$	122,391		$	—		$	—		$	122,391
Intercompany rental revenue	23,301			—			(23,301		)	—
Tenant expense reimbursement	20,346			—			—			20,346
Observatory revenue	—			39,306			—			39,306
Third-party management and other fees	345			—			—			345
Other revenue and fees	4,932			—			—			4,932
Total revenues	171,315			39,306			(23,301		)	187,320
Operating expenses:
Property operating expenses	41,270			—			—			41,270
Intercompany rent expense	—			23,301			(23,301		)	—
Ground rent expense	2,331			—			—			2,331
General and administrative expenses	12,899			—			—			12,899
Observatory expenses	—			8,648			—			8,648
Real estate taxes	26,901			—			—			26,901
Depreciation and amortization	38,473			17			—			38,490
Total operating expenses	121,874			31,966			(23,301		)	130,539
Total operating income	49,441			7,340			—			56,781
Other expenses:
Interest expense	(16,890		)	—			—			(16,890		)
Loss on early extinguishment of debt	(2,157		)	—			—			(2,157		)
Loss from derivative financial instruments	—			—			—			—
Income before income taxes	30,394			7,340			—			37,734
Income tax expense	(264		)	(1,981		)	—			(2,245		)
Net income	$	30,130		$	5,359		$	—		$	35,489
Segment assets	$	3,582,935		$	265,999		$	—		$	3,848,934
Expenditures for segment assets	$	40,320		$	13,411		$	—		$	53,731

	Three Months Ended September 30, 2016
	Real Estate			Observatory			Intersegment Elimination			Total
Revenues:
Rental revenue	$	115,634		$	—		$	—		$	115,634
Intercompany rental revenue	22,983			—			(22,983		)	—
Tenant expense reimbursement	19,176			—			—			19,176
Observatory revenue	—			38,093			—			38,093
Third-party management and other fees	404			—			—			404
Other revenue and fees	2,536			5			—			2,541
Total revenues	160,733			38,098			(22,983		)	175,848
Operating expenses:
Property operating expenses	38,585			—			—			38,585
Intercompany rent expense	—			22,983			(22,983		)	—
Ground rent expense	2,331			—			—			2,331
General and administrative expenses	11,798			—			—			11,798
Observatory expenses	—			7,250			—			7,250
Real estate taxes	24,691			—			—			24,691
Acquisition expenses	—			—			—			—
Depreciation and amortization	37,421			186			—			37,607
Total operating expenses	114,826			30,419			(22,983		)	122,262
Total operating income	45,907			7,679			—			53,586
Other expenses:
Interest expense	(17,939		)	—			—			(17,939		)
Loss on early extinguishment of debt	—			—			—			—
Loss from derivative financial instruments	—			—			—			—
Income before income taxes	27,968			7,679			—			35,647
Income tax expense	(332		)	(2,418		)	—			(2,750		)
Net income	$	27,636		$	5,261		$	—		$	32,897
Segment assets	$	3,636,262		$	246,307		$	—		$	3,882,569
Expenditures for segment assets	$	52,828		$	—		$	—		$	52,828

	Nine Months Ended September 30, 2017
	Real Estate			Observatory			Intersegment Elimination			Total
Revenues:
Rental revenue	$	360,348		$	—		$	—		$	360,348
Intercompany rental revenue	57,354			—			(57,354		)	—
Tenant expense reimbursement	53,889			—			—			53,889
Observatory revenue	—			94,212			—			94,212
Third-party management and other fees	1,088			—			—			1,088
Other revenue and fees	19,861			—			—			19,861
Total revenues	492,540			94,212			(57,354		)	529,398
Operating expenses:
Property operating expenses	122,009			—			—			122,009
Intercompany rent expense	—			57,354			(57,354		)	—
Ground rent expense	6,994			—			—			6,994
General and administrative expenses	36,566			—			—			36,566
Observatory expenses	—			23,079			—			23,079
Real estate taxes	76,001			—			—			76,001
Acquisition expenses	—			—			—			—
Depreciation and amortization	119,764			104			—			119,868
Total operating expenses	361,334			80,537			(57,354		)	384,517
Total operating income	131,206			13,675			—			144,881
Other expenses:
Interest expense	(52,109		)	—			—			(52,109		)
Loss on early extinguishment of debt	(2,157		)	—			—			(2,157		)
Loss from derivative financial instruments	(289		)	—			—			(289		)
Income before income taxes	76,651			13,675			—			90,326
Income tax expense	(960		)	(3,373		)	—			(4,333		)
Net income	$	75,691		$	10,302		$	—		$	85,993
Expenditures for segment assets	$	142,854		$	20,261		$	—		$	163,115

	Nine Months Ended September 30, 2016
	Real Estate			Observatory			Intersegment Elimination			Total
Revenues:
Rental revenue	$	343,155		$	—		$	—		$	343,155
Intercompany rental revenue	55,189			—			(55,189		)	—
Tenant expense reimbursement	56,350			—			—			56,350
Observatory revenue	—			91,112			—			91,112
Third-party management and other fees	1,372			—			—			1,372
Other revenue and fees	6,738			10			—			6,748
Total revenues	462,804			91,122			(55,189		)	498,737
Operating expenses:
Property operating expenses	115,075			—			—			115,075
Intercompany rent expense	—			55,189			(55,189		)	—
Ground rent expense	6,994			—			—			6,994
General and administrative expenses	35,623			—			—			35,623
Observatory expenses	—			21,900			—			21,900
Real estate taxes	71,773			—			—			71,773
Acquisition expenses	98			—			—			98
Depreciation and amortization	115,002			380			—			115,382
Total operating expenses	344,565			77,469			(55,189		)	366,845
Total operating income	118,239			13,653			—			131,892
Other expenses:
Interest expense	(52,758		)	—			—			(52,758		)
Loss on early extinguishment of debt	(552		)	—			—			(552		)
Loss from derivative financial instruments	—			—			—			—
Income before income taxes	64,929			13,653			—			78,582
Income tax expense	(1,018		)	(3,322		)	—			(4,340		)
Net income	$	63,911		$	10,331		$	—		$	74,242
Expenditures for segment assets	$	140,052		$	47		$	—		$	140,099

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Subsequent Events

9 Months Ended

Sep. 30, 2017

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

None.

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Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Basis of Quarterly Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”), for interim financial information, and with the rules and regulations of the Securities and Exchange Commission (the "SEC"). Accordingly, certain information and footnote disclosures required by GAAP for complete financial statements have been condensed or omitted in accordance with such rules and regulations. In the opinion of management, all adjustments and eliminations (including intercompany balances and transactions), consisting of normal recurring adjustments, considered necessary for the fair presentation of the financial statements have been included.

Principles of Consolidation

The results of operations for the periods presented are not necessarily indicative of the results that may be expected for the corresponding full years. These financial statements should be read in conjunction with the financial statements and accompanying notes included in the financial statements for the year ended December 31, 2016 contained in our Annual Report on Form 10-K. We do not consider our business to be subject to material seasonal fluctuations, except that our observatory business is subject to tourism seasonality.

Principles of Consolidation for Variable Interest Entities

We consolidate entities in which we have a controlling financial interest.  In determining whether we have a controlling financial interest in a partially owned entity and the requirement to consolidate the accounts of that entity, we consider factors such as ownership interest, board representation, management representation, authority to make decisions, and contractual and substantive participating rights of the partners/members.  For variable interest entities ("VIE"), we consolidate the entity if we are deemed to have a variable interest in the entity and through that interest we are deemed the primary beneficiary. The primary beneficiary of a VIE 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. The primary beneficiary is required to consolidate the VIE. The Operating Partnership is a variable interest entity of our company, Empire State Realty Trust, Inc.  As the Operating Partnership is already consolidated in the financial statements of Empire State Realty Trust, Inc., the identification of this entity as a variable interest entity has no impact on our consolidated financial statements.

We will assess the accounting treatment for each investment we may have in the future. This assessment will include a review of each entity’s organizational agreement to determine which party has what rights and whether those rights are protective or participating. For all VIEs, we will review such agreements in order to determine which party has the power to direct the activities that most significantly impact the entity’s economic performance and benefit. In situations where we or our partner could approve, among other things, the annual budget, or leases that cover more than a nominal amount of space relative to the total rentable space at each property, we would not consolidate the investment as we consider these to be substantive participation rights that result in shared power of the activities that would most significantly impact the performance and benefit of such joint venture investment.

A non-controlling interest in a consolidated subsidiary is defined as the portion of the equity (net assets) in a subsidiary not attributable, directly or indirectly, to a parent. Non-controlling interests are required to be presented as a separate component of equity in the condensed consolidated balance sheets and in the condensed consolidated statements of income by requiring earnings and other comprehensive income to be attributed to controlling and non-controlling interests.

Accounting Estimates

The preparation of the condensed consolidated financial statements in accordance with GAAP requires management to use estimates and assumptions that in certain circumstances affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities, and the reported revenues and expenses. Significant items subject to such estimates and assumptions include allocation of the purchase price of acquired real estate properties among tangible and intangible assets, determination of the useful life of real estate properties and other long-lived assets, valuation and impairment analysis of commercial real estate properties and other long-lived assets, estimate of tenant expense reimbursements, valuation of the allowance for doubtful accounts, and valuation of derivative instruments, senior unsecured notes, mortgage notes payable, unsecured term loan and revolving credit facilities, and equity based compensation. These estimates are prepared using management’s best judgment, after considering past, current, and expected events and economic conditions. Actual results could differ from those estimates.

Reclassification

Certain prior year balances have been reclassified to conform to our current year presentation. The prior year balance of interest expense has been reclassified to separately present loss on early extinguishment of debt.

Recently Issued or Adopted Accounting Standards

During August 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, which amends its hedge accounting model to enable entities to better portray their risk management activities in the financial statements. The amendments expand an entity’s ability to hedge nonfinancial and financial risk components and reduce complexity in fair value hedges of interest rate risk. ASU No. 2017-12 eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. It also eases certain documentation and assessment requirements and modifies the accounting for components excluded from the assessment of hedge effectiveness. ASU No. 2017-12 will be effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early application is permitted in any interim period. All transition requirements and elections should be applied to hedging relationships existing on the date of adoption. The effect of adoption should be reflected as of the beginning of the fiscal year of adoption (that is, the initial application date). During the quarter, we early adopted ASU No. 2017-02 using a modified retrospective approach for existing and active hedging relationships as of adoption date. The adoption of ASU No. 2017-02 did not have a material impact on our consolidated financial statements.

During January 2017, the FASB issued ASU No. 2017-04, Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment, which contain amendments that modify the concept of impairment from the condition that exists when the carrying amount of goodwill exceeds its implied fair value to the condition that exists when the carrying amount of a reporting unit exceeds its fair value. An entity no longer will determine goodwill impairment by calculating the implied fair value of goodwill by assigning the fair value of a reporting unit to all of its assets and liabilities as if that reporting unit had been acquired in a business combination. Because these amendments eliminate Step 2 from the goodwill impairment test, they should reduce the cost and complexity of evaluating goodwill for impairment. ASU No. 2017-04 should be applied on a prospective basis and the amendments adopted for the annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

During January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business, which contain amendments to clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The amendments in ASU No. 2017-01 provide a screen to determine when an integrated set of assets and activities (collectively referred to as a “set”) is not a business. The screen requires that when substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. This screen reduces the number of transactions that need to be further evaluated. Real estate acquisitions that do not meet the definition of a business will be accounted for as asset acquisitions and the corresponding acquisition costs will be capitalized rather than expensed. These amendments narrow the definition of the term output so that the term is consistent with how outputs are described in Topic 606, Revenue from Contracts with Customers. ASU No. 2017-01 will be effective for annual periods beginning after December 15, 2017, including interim periods within those periods. The amendments should be applied prospectively on or after the effective date. No disclosures are required at transition. We believe that future acquisitions of real estate properties will be considered asset acquisitions.

During November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, which contain amendments that require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. ASU No. 2016-18 will be effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. The amendments should be applied using a retrospective transition method to each period presented. We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

During August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. ASU No. 2016-15 will be effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Earlier adoption is permitted including adoption in an interim period. We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

During June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which contains amendments that replace the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. ASU No. 2016-13 will be effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Earlier adoption as of the fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, is permitted. The amendments must be adopted through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective (that is, a modified retrospective approach). We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

During February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which requires that a lessee recognize in the statement of financial position a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. ASU No. 2016-02 leaves the accounting for leases by lessors largely unchanged from previous GAAP. ASU No. 2016-02 will be effective for fiscal years beginning after December 15, 2018 and subsequent interim periods. The new standard must be adopted using a modified retrospective transition, and provides for certain practical expedients. Transition will require application of the new guidance at the beginning of the earliest comparative period presented. This ASU is expected to result in the recognition of a right-to-use asset and related liability to account for our future obligations under our ground lease agreements for which we are the lessee. As of September 30, 2017, the remaining contractual payments under our ground lease agreements aggregated $61.7 million. In addition, under ASU 2016-02, lessors may only capitalize incremental direct leasing costs. As a result, we expect that we will no longer capitalize our internal leasing costs and instead will expense these costs as incurred. These costs totaled $2.3 million for the year ended December 31, 2016. We continue to evaluate the impact of adopting this new accounting standard on our consolidated financial statements.

During May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which will replace all current GAAP guidance related to revenue recognition and eliminate all industry-specific guidance. The new revenue recognition standard provides a unified model to determine when and how revenue is recognized. The core principle is that a company should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This guidance can be applied either retrospectively to each period presented or as a cumulative-effect adjustment as of the date of adoption. ASU No. 2014-09 was amended in August 2015 by ASU No. 2015-14 Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, which defers the effective date of ASU No. 2014-09 for all entities by one year. Public business entities, certain not-for-profit entities, and certain employee benefit plans should apply the guidance in ASU No. 2014-09 to annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. Earlier application is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. ASU No. 2014-09 was further amended in December 2016 by ASU No. 2016-20 Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers which contain amendments that are intended to clarify or correct unintended application of the guidance. Those items generally are not expected to have a significant effect on current accounting practice or create a significant administrative cost for most entities. The effective date and transition requirements for the amendments are the same as the effective date and transition requirements for Topic 606. We plan to adopt this standard on the required effective date of January 1, 2018 using the modified retrospective approach and we do not expect the adoption to have a material impact on our consolidated financial statements. This standard excludes from its scope, accounting for leases which is covered by ASU No. 2016-02, Leases. However, the non-lease service components within a lease such as common area maintenance reimbursed by tenants will be considered individual performance obligations and be subject to the new revenue recognition standard, and such revenue will be recognized over the period in which the related services are performed. We expect to apply the new revenue guidance to non-lease components within tenant leases upon our adoption of the lease standard effective January 1, 2019.

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Deferred Costs, Acquired Lease Intangibles and Goodwill (Tables)

9 Months Ended

Sep. 30, 2017

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

Deferred Costs, Net

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

	September 30, 2017			December 31, 2016
Leasing costs	$	158,780		$	140,325
Acquired in-place lease value and deferred leasing costs	244,829			253,113
Acquired above-market leases	70,290			74,770
	473,899			468,208
Less: accumulated amortization	(214,466		)	(195,617		)
Total deferred costs, net, excluding net deferred financing costs	$	259,433		$	272,591

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

	September 30, 2017			December 31, 2016
Financing costs	$	23,333		$	23,145
Less: accumulated amortization	(6,004		)	(12,241		)
Total deferred financing costs, net	$	17,329		$	10,904

Amortizing Acquired Intangible Assets and Liabilities

Amortizing acquired intangible assets and liabilities consisted of the following as of September 30, 2017 and December 31, 2016 (amounts in thousands):

	September 30, 2017			December 31, 2016
Acquired below-market ground leases	$	396,916		$	396,916
Less: accumulated amortization	(26,729		)	(20,856		)
Acquired below-market ground leases, net	$	370,187		$	376,060

	September 30, 2017			December 31, 2016
Acquired below-market leases	$	(132,723	)	$	(135,026	)
Less: accumulated amortization	62,710			52,726
Acquired below-market leases, net	$	(70,013	)	$	(82,300	)

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Debt (Tables)

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Long-Term Debt

Debt consisted of the following as of September 30, 2017 and December 31, 2016 (amounts in thousands):

	Principal Balance						As of September 30, 2017
	September 30, 2017			December 31, 2016			Stated Rate		Effective Rate(1)		Maturity Date(2)
Mortgage debt collateralized by:
Fixed rate mortgage debt
1333 Broadway	$	66,872		$	67,656		6.32	%	3.73	%	1/5/2018
1400 Broadway
(first lien mortgage loan)	66,909			67,714			6.12	%	3.37	%	2/5/2018
(second lien mortgage loan)	9,226			9,389			3.35	%	3.36	%	2/5/2018
111 West 33rd Street
(first lien mortgage loan)	74,356			75,261			6.01	%	3.32	%	4/5/2018
(second lien mortgage loan)	9,405			9,509			6.56	%	3.62	%	4/5/2018
1350 Broadway	37,302			37,764			5.87	%	3.71	%	4/5/2018
Metro Center	94,464			95,985			3.59	%	3.66	%	11/5/2024
10 Union Square	50,000			50,000			3.70	%	3.97	%	4/1/2026
1542 Third Avenue	30,000			17,795			4.29	%	4.68	%	5/1/2027
First Stamford Place(3)	180,000			235,067			4.28	%	4.67	%	7/1/2027
1010 Third Avenue and 77 West 55th Street	39,885			26,502			4.01	%	4.45	%	1/5/2028
10 Bank Street	34,802			31,544			4.23	%	4.54	%	6/1/2032
383 Main Avenue	30,000			28,654			4.44	%	4.77	%	6/30/2032
Total mortgage debt	723,221			752,840
Senior unsecured notes - exchangeable	250,000			250,000			2.63	%	3.93	%	8/15/2019
Senior unsecured notes:(6)
Series A	100,000			100,000			3.93	%	4.00	%	3/27/2025
Series B	125,000			125,000			4.09	%	4.17	%	3/27/2027
Series C	125,000			125,000			4.18	%	4.26	%	3/27/2030
Unsecured revolving credit facility(6)	—			—			(4)		(4)		8/29/2021
Unsecured term loan facility(6)	265,000			265,000			(5)		(5)		8/29/2022
Total principal	1,588,221			1,617,840
Unamortized premiums, net of unamortized discount	(2,301		)	905
Deferred financing costs, net	(8,630		)	(6,414		)
Total	$	1,577,290		$	1,612,331

______________

(1) The effective rate is the yield as of September 30, 2017, including the effects of debt issuance costs and the amortization of the fair value of debt adjustment.

(2) Pre-payment is generally allowed for each loan upon payment of a customary pre-payment penalty.

(3) Represents a $164 million mortgage loan bearing interest of 4.09% and a $16 million loan bearing interest at 6.25%.

(4) At September 30, 2017, the unsecured revolving credit facility bears a floating rate at 30 day LIBOR plus 1.10%. The rate at September 30, 2017 was 2.33%.

(5) The unsecured term loan facility bears a floating rate at 30 day LIBOR plus 1.20%. Pursuant to a forward interest rate swap agreement, the LIBOR rate is fixed at 2.1485% for the period beginning on August 31, 2017 through maturity. The rate at September 30, 2017 was 3.35%.

(6) At September 30, 2017, we were in compliance with all debt covenants.

Aggregate Required Principal Payments

Aggregate required principal payments at September 30, 2017 are as follows (amounts in thousands):

Year	Amortization		Maturities		Total
2017	$	1,983	$	—	$	1,983
2018	4,417		262,210		266,627
2019	3,790		250,000		253,790
2020	3,938		—		3,938
2021	4,090		—		4,090
Thereafter	43,407		1,014,386		1,057,793
Total	$	61,625	$	1,526,596	$	1,588,221

Deferred Financing Costs, Net

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

	September 30, 2017			December 31, 2016
Leasing costs	$	158,780		$	140,325
Acquired in-place lease value and deferred leasing costs	244,829			253,113
Acquired above-market leases	70,290			74,770
	473,899			468,208
Less: accumulated amortization	(214,466		)	(195,617		)
Total deferred costs, net, excluding net deferred financing costs	$	259,433		$	272,591

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

	September 30, 2017			December 31, 2016
Financing costs	$	23,333		$	23,145
Less: accumulated amortization	(6,004		)	(12,241		)
Total deferred financing costs, net	$	17,329		$	10,904

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Accounts Payable and Accrued Expenses (Tables)

9 Months Ended

Sep. 30, 2017

Payables and Accruals [Abstract]

Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses consist of the following as of September 30, 2017 and December 31, 2016 (amounts in thousands):

	September 30, 2017		December 31, 2016
Accounts payable and accrued expenses	$	106,420	$	102,866
Payable to the estate of Leona M. Helmsley (1)	18,367		18,367
Interest rate swap agreements liability	13,378		5,591
Accrued interest payable	3,903		6,230
Due to affiliated companies	622		1,010
Accounts payable and accrued expenses	$	142,690	$	134,064

___________

(1) Reflects a payable to the estate of Leona M. Helmsley, as required under our formation agreements, for New York City transfer taxes which would have been payable in absence of the estate's exemption from such tax. The taxing authority's final approval of such exemption was issued during the three months ended September 30, 2017, and upon receipt of the confirming documents we made this payment to the estate of Leona M. Helmsley on October 2, 2017.

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Financial Instruments and Fair Values (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Summary of the Terms of Agreements and the Fair Value of Derivative Financial Instruments

The table below summarizes the terms of agreements and the fair values of our derivative financial instruments as of September 30, 2017 and December 31, 2016 (dollar amounts in thousands):     

							September 30, 2017					December 31, 2016
Derivative	Notional Amount		Receive Rate	Pay Rate	Effective Date	Expiration Date	Asset		Liability			Asset		Liability
Interest rate swap	$	265,000	1 Month LIBOR	2.1485%	August 31, 2017	August 24, 2022	$	—	$	(3,436	)	$	—	$	(1,634	)
Interest rate swap (1)	100,000		3 Month LIBOR	2.5050%	July 5, 2017	July 5, 2027	—		—			—		(684		)
Interest rate swap (1) (2)	80,000		3 Month LIBOR	2.5050%	July 5, 2017	July 5, 2027	—		—			—		(685		)
Interest rate swap	100,000		3 Month LIBOR	2.4860%	January 5, 2018	January 5, 2028	—		(1,448		)	224		—
Interest rate swap	100,000		3 Month LIBOR	2.4860%	January 5, 2018	January 5, 2028	—		(1,448		)	223		—
Interest rate swap	75,000		3 Month LIBOR	2.4860%	January 5, 2018	January 5, 2028	—		(1,086		)	167		—
Interest rate swap	75,000		3 Month LIBOR	2.7620%	June 1, 2018	June 1, 2028	—		(2,592		)	—		(1,295		)
Interest rate swap	75,000		3 Month LIBOR	2.7620%	June 1, 2018	June 1, 2028	—		(2,591		)	—		(1,293		)
Interest rate swap	100,000		3 Month LIBOR	2.4625%	June 1, 2018	June 1, 2028	—		(777		)	—		—
							$	—	$	(13,378	)	$	614	$	(5,591	)

(1) During June 2017, these swaps aggregating $180.0 million were terminated in connection with the refinancing of several of our mortgage debt (see Note 4 Debt). As of September 30, 2017, the deferred net losses from these terminated hedges amounted to $5.9 million which is included in accumulated other comprehensive loss relating to net unrealized loss from derivative financial instruments.

(2) During March 2017, $20.0 million of an original notional amount of $100.0 million was terminated. In connection with the partial termination and re-designation of the related cash flow hedges, $0.3 million is recognized as a loss from derivative financial instruments and included in Other Expenses on the condensed consolidated statement of income for the nine months ended September 30, 2017. There was no loss from derivative financial instruments for the three months ended September 30, 2017 and for the three and nine months ended September 30, 2016.

Effect of Derivative Financial Instruments Designated as Cash Flow Hedges

The table below shows the effect of our derivative financial instruments designated as cash flow hedges on accumulated other comprehensive income (loss) for the three and nine months endedSeptember 30, 2017 and 2016 (amounts in thousands):    

	Three Months Ended					Nine Months Ended
Effects of Cash Flow Hedges	September 30, 2017			September 30, 2016		September 30, 2017			September 30, 2016
Amount of gain (loss) recognized in other comprehensive income (loss)	$	(1,638	)	$	930	$	(14,654	)	$	(29,305	)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense	(359		)	—		(402		)	—

The table below shows the effect of our derivative financial instruments designated as cash flow hedges on the condensed consolidated income statements for the three and nine months endedSeptember 30, 2017 and 2016 (amounts in thousands):

	Three Months Ended						Nine Months Ended
Effects of Cash Flow Hedges	September 30, 2017			September 30, 2016			September 30, 2017			September 30, 2016
Total interest (expense) presented in the condensed consolidated income statements in which the effects of cash flow hedges are recorded	$	(16,890	)	$	(17,939	)	$	(52,109	)	$	(52,758	)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense	(359		)	—			(402		)	—

Summary of the Carrying and Estimated Fair Values of Financial Instruments

The following tables summarize the carrying and estimated fair values of our financial instruments as of September 30, 2017 and December 31, 2016 (amounts in thousands):

	September 30, 2017
			Estimated Fair Value
	Carrying Value		Total		Level 1		Level 2		Level 3
Interest rate swaps included in prepaid expenses and other assets	$	—	$	—	$	—	$	—	$	—
Interest rate swaps included in accounts payable and accrued expenses	13,378		13,378		—		13,378		—
Mortgage notes payable	720,830		712,365		—		—		712,365
Senior unsecured notes - Exchangeable	243,923		281,068		—		281,068		—
Senior unsecured notes - Series A, B, and C	348,991		344,267		—		—		344,267
Unsecured term loan facility	263,546		265,000		—		—		265,000

	December 31, 2016
			Estimated Fair Value
	Carrying Value		Total		Level 1		Level 2		Level 3
Interest rate swaps included in prepaid expenses and other assets	$	614	$	614	$	—	$	614	$	—
Interest rate swaps included in accounts payable and accrued expenses	5,591		5,591		—		5,591		—
Mortgage notes payable	759,016		755,640		—		—		755,640
Senior unsecured notes - Exchangeable	241,474		282,435		—		282,435		—
Senior unsecured notes - Series A, B, and C	348,914		339,274		—		—		339,274
Unsecured term loan facility	262,927		265,000		—		—		265,000

XML

Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Aggregate Required Payments on Ground Leases

Aggregate required payments on ground leases at September 30, 2017 were as follows (amounts in thousands):

2017	$	380
2018	1,518
2019	1,518
2020	1,518
2021	1,518
Thereafter	55,212
	$	61,664

XML

Equity (Tables)

9 Months Ended

Sep. 30, 2017

Equity [Abstract]

Change in Net Income Attributable to Common Shareholders

The following is net income attributable to common stockholders and the issuance of our Class A shares in exchange for the conversion of OP Units into common stock (amounts in thousands):

	Three Months Ended				Nine Months Ended
	September 30, 2017		September 30, 2016		September 30, 2017		September 30, 2016
Net income attributable to common stockholders	$	18,806	$	15,973	$	45,375	$	34,490
Increase in additional paid-in capital for the conversion of OP Units into common stock	1,953		5,016		11,087		20,217
Change from net income attributable to common stockholders and transfers from non-controlling interests	$	20,759	$	20,989	$	56,462	$	54,707

Summary of Restricted Stock and Long-Term Incentive Plan Activity

The following is a summary of restricted stock and LTIP unit activity for the nine months endedSeptember 30, 2017:

	Restricted Stock		LTIP Units		Weighted Average Grant Fair Value
Unvested balance at December 31, 2016	107,793		2,881,629		$	10.01
Vested	(17,923	)	(323,982	)	13.74
Granted	34,407		1,372,574		13.77
Forfeited or unearned	(2,509	)	(77,227	)	5.36
Unvested balance at September 30, 2017	121,768		3,852,994		$	11.11

Earnings Per Share

Earnings per share for the three and nine months ended September 30, 2017 and 2016 is computed as follows (amounts in thousands, except per share amounts):

	Three Months Ended,						Nine Months Ended,
	September 30, 2017			September 30, 2016			September 30, 2017			September 30, 2016
Numerator - Basic:
Net income	$	35,489		$	32,897		$	85,993		$	74,242
Private perpetual preferred unit distributions	(234		)	(234		)	(702		)	(702		)
Net income attributable to non-controlling interests	(16,449		)	(16,690		)	(39,916		)	(39,050		)
Earnings allocated to unvested shares	(11		)	(11		)	(28		)	(27		)
Net income attributable to common stockholders - basic	$	18,795		$	15,962		$	45,347		$	34,463
Numerator - Diluted:
Net income	$	35,489		$	32,897		$	85,993		$	74,242
Private perpetual preferred unit distributions	(234		)	(234		)	(702		)	(702		)
Earnings allocated to unvested shares	(11		)	(11		)	(28		)	(27		)
Net income attributable to common stockholders - diluted	$	35,244		$	32,652		$	85,263		$	73,513
Denominator:
Weighted average shares outstanding - basic	158,102			136,831			157,796			126,740
Operating partnership units	138,287			141,908			138,593			143,648
Effect of dilutive securities:
Stock-based compensation plans	762			1,090			848			378
Exchangeable senior notes	720			785			852			262
Weighted average shares outstanding - diluted	297,871			280,614			298,089			271,028
Earnings per share:
Basic	$	0.12		$	0.12		$	0.29		$	0.27
Diluted	$	0.12		$	0.12		$	0.29		$	0.27

XML

Segment Reporting (Tables)

9 Months Ended

Sep. 30, 2017

Segment Reporting [Abstract]

Components of Segment Profit for Each Segment

The following tables provide components of segment profit for each segment for the three and nine months endedSeptember 30, 2017 and 2016 (amounts in thousands):

	Three Months Ended September 30, 2017
	Real Estate			Observatory			Intersegment Elimination			Total
Revenues:
Rental revenue	$	122,391		$	—		$	—		$	122,391
Intercompany rental revenue	23,301			—			(23,301		)	—
Tenant expense reimbursement	20,346			—			—			20,346
Observatory revenue	—			39,306			—			39,306
Third-party management and other fees	345			—			—			345
Other revenue and fees	4,932			—			—			4,932
Total revenues	171,315			39,306			(23,301		)	187,320
Operating expenses:
Property operating expenses	41,270			—			—			41,270
Intercompany rent expense	—			23,301			(23,301		)	—
Ground rent expense	2,331			—			—			2,331
General and administrative expenses	12,899			—			—			12,899
Observatory expenses	—			8,648			—			8,648
Real estate taxes	26,901			—			—			26,901
Depreciation and amortization	38,473			17			—			38,490
Total operating expenses	121,874			31,966			(23,301		)	130,539
Total operating income	49,441			7,340			—			56,781
Other expenses:
Interest expense	(16,890		)	—			—			(16,890		)
Loss on early extinguishment of debt	(2,157		)	—			—			(2,157		)
Loss from derivative financial instruments	—			—			—			—
Income before income taxes	30,394			7,340			—			37,734
Income tax expense	(264		)	(1,981		)	—			(2,245		)
Net income	$	30,130		$	5,359		$	—		$	35,489
Segment assets	$	3,582,935		$	265,999		$	—		$	3,848,934
Expenditures for segment assets	$	40,320		$	13,411		$	—		$	53,731

	Three Months Ended September 30, 2016
	Real Estate			Observatory			Intersegment Elimination			Total
Revenues:
Rental revenue	$	115,634		$	—		$	—		$	115,634
Intercompany rental revenue	22,983			—			(22,983		)	—
Tenant expense reimbursement	19,176			—			—			19,176
Observatory revenue	—			38,093			—			38,093
Third-party management and other fees	404			—			—			404
Other revenue and fees	2,536			5			—			2,541
Total revenues	160,733			38,098			(22,983		)	175,848
Operating expenses:
Property operating expenses	38,585			—			—			38,585
Intercompany rent expense	—			22,983			(22,983		)	—
Ground rent expense	2,331			—			—			2,331
General and administrative expenses	11,798			—			—			11,798
Observatory expenses	—			7,250			—			7,250
Real estate taxes	24,691			—			—			24,691
Acquisition expenses	—			—			—			—
Depreciation and amortization	37,421			186			—			37,607
Total operating expenses	114,826			30,419			(22,983		)	122,262
Total operating income	45,907			7,679			—			53,586
Other expenses:
Interest expense	(17,939		)	—			—			(17,939		)
Loss on early extinguishment of debt	—			—			—			—
Loss from derivative financial instruments	—			—			—			—
Income before income taxes	27,968			7,679			—			35,647
Income tax expense	(332		)	(2,418		)	—			(2,750		)
Net income	$	27,636		$	5,261		$	—		$	32,897
Segment assets	$	3,636,262		$	246,307		$	—		$	3,882,569
Expenditures for segment assets	$	52,828		$	—		$	—		$	52,828

	Nine Months Ended September 30, 2017
	Real Estate			Observatory			Intersegment Elimination			Total
Revenues:
Rental revenue	$	360,348		$	—		$	—		$	360,348
Intercompany rental revenue	57,354			—			(57,354		)	—
Tenant expense reimbursement	53,889			—			—			53,889
Observatory revenue	—			94,212			—			94,212
Third-party management and other fees	1,088			—			—			1,088
Other revenue and fees	19,861			—			—			19,861
Total revenues	492,540			94,212			(57,354		)	529,398
Operating expenses:
Property operating expenses	122,009			—			—			122,009
Intercompany rent expense	—			57,354			(57,354		)	—
Ground rent expense	6,994			—			—			6,994
General and administrative expenses	36,566			—			—			36,566
Observatory expenses	—			23,079			—			23,079
Real estate taxes	76,001			—			—			76,001
Acquisition expenses	—			—			—			—
Depreciation and amortization	119,764			104			—			119,868
Total operating expenses	361,334			80,537			(57,354		)	384,517
Total operating income	131,206			13,675			—			144,881
Other expenses:
Interest expense	(52,109		)	—			—			(52,109		)
Loss on early extinguishment of debt	(2,157		)	—			—			(2,157		)
Loss from derivative financial instruments	(289		)	—			—			(289		)
Income before income taxes	76,651			13,675			—			90,326
Income tax expense	(960		)	(3,373		)	—			(4,333		)
Net income	$	75,691		$	10,302		$	—		$	85,993
Expenditures for segment assets	$	142,854		$	20,261		$	—		$	163,115

	Nine Months Ended September 30, 2016
	Real Estate			Observatory			Intersegment Elimination			Total
Revenues:
Rental revenue	$	343,155		$	—		$	—		$	343,155
Intercompany rental revenue	55,189			—			(55,189		)	—
Tenant expense reimbursement	56,350			—			—			56,350
Observatory revenue	—			91,112			—			91,112
Third-party management and other fees	1,372			—			—			1,372
Other revenue and fees	6,738			10			—			6,748
Total revenues	462,804			91,122			(55,189		)	498,737
Operating expenses:
Property operating expenses	115,075			—			—			115,075
Intercompany rent expense	—			55,189			(55,189		)	—
Ground rent expense	6,994			—			—			6,994
General and administrative expenses	35,623			—			—			35,623
Observatory expenses	—			21,900			—			21,900
Real estate taxes	71,773			—			—			71,773
Acquisition expenses	98			—			—			98
Depreciation and amortization	115,002			380			—			115,382
Total operating expenses	344,565			77,469			(55,189		)	366,845
Total operating income	118,239			13,653			—			131,892
Other expenses:
Interest expense	(52,758		)	—			—			(52,758		)
Loss on early extinguishment of debt	(552		)	—			—			(552		)
Loss from derivative financial instruments	—			—			—			—
Income before income taxes	64,929			13,653			—			78,582
Income tax expense	(1,018		)	(3,322		)	—			(4,340		)
Net income	$	63,911		$	10,331		$	—		$	74,242
Expenditures for segment assets	$	140,052		$	47		$	—		$	140,099

XML

Description of Business and Organization - Narrative (Details)	9 Months Ended
	Sep. 30, 2017 ft² parcel office_and_property
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property (in square feet)	10,100,000
OP units owned by the Company (as a percent)	53.10%
Office Building
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property (in square feet)	9,400,000
Number of properties | office_and_property	14
Office Building | Manhattan
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property (in square feet)	7,600,000
Number of properties | office_and_property	9
Office Building | Fairfield County, Connecticut and Westchester County, New York
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property (in square feet)	1,900,000
Number of properties | office_and_property	5
Development Parcel
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of properties | parcel	3
Retail Site | Manhattan and Westport, Connecticut
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property (in square feet)	204,450
Retail Site | Manhattan
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property (in square feet)	494,935
Number of properties | office_and_property	4
Retail Site | Westport, Connecticut
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of properties | office_and_property	2
Other Property | Stamford, Connecticut
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property (in square feet)	380,000

XML

Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accounting Policies [Line Items]
Capitalized internal leasing costs		$ 2,300
Minimum
Accounting Policies [Line Items]
Observatory revenue realized during the first quarter, previous ten years (as a percent)	16.00%
Observatory revenue realized during the second quarter, previous ten years (as a percent)	26.00%
Observatory revenue realized during the third quarter, previous ten years (as a percent)	31.00%
Observatory revenue realized during the fourth quarter, previous ten years (as a percent)	23.00%
Maximum
Accounting Policies [Line Items]
Observatory revenue realized during the first quarter, previous ten years (as a percent)	18.00%
Observatory revenue realized during the second quarter, previous ten years (as a percent)	28.00%
Observatory revenue realized during the third quarter, previous ten years (as a percent)	33.00%
Observatory revenue realized during the fourth quarter, previous ten years (as a percent)	25.00%
Ground lease agreements
Accounting Policies [Line Items]
Remaining contractual payments under ground lease agreements	$ 61,664

XML

Deferred Costs, Acquired Lease Intangibles and Goodwill - Deferred Costs, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Leasing costs	$ 158,780	$ 140,325
Total deferred costs, gross amount	473,899	468,208
Less: accumulated amortization	(214,466)	(195,617)
Total deferred costs, net, excluding net deferred financing costs	259,433	272,591
Acquired in-place lease value and deferred leasing costs
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets	244,829	253,113
Acquired above-market leases
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets	$ 70,290	$ 74,770

XML

Deferred Costs, Acquired Lease Intangibles and Goodwill - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Deferred Costs [Line Items]
Amortization expense related to deferred leasing costs	$ 5,800	$ 6,100	$ 17,900	$ 17,600
Revenue related to amortization of acquired above- and below-market leases, net	1,600	1,200	4,154	6,285
Goodwill	491,479		491,479		$ 491,479
Observatory
Deferred Costs [Line Items]
Goodwill	227,500		227,500
Real estate
Deferred Costs [Line Items]
Goodwill	264,000		264,000
Lease agreements
Deferred Costs [Line Items]
Amortization expense related to acquired lease intangibles	4,000	$ 5,000	13,000	$ 19,700
Unsecured revolving credit facility | Unsecured term loan facility
Deferred Costs [Line Items]
Net deferred financing costs	$ 8,700		$ 8,700		$ 4,500

XML

Deferred Costs, Acquired Lease Intangibles and Goodwill - Amortizing Acquired Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Acquired below-market ground leases
Acquired below-market ground leases, gross	$ 396,916	$ 396,916
Less: accumulated amortization	(26,729)	(20,856)
Acquired below-market ground leases, net	370,187	376,060
Acquired below-market leases
Acquired below-market leases, gross	(132,723)	(135,026)
Less: accumulated amortization	62,710	52,726
Acquired below-market leases, net	$ (70,013)	$ (82,300)

XML

Debt - Long-Term Debt (Details) - USD ($)	9 Months Ended
	Sep. 30, 2017	Aug. 31, 2017	Jun. 30, 2017	May 31, 2017	Apr. 30, 2017	Dec. 31, 2016	Aug. 31, 2014
Debt Instrument [Line Items]
Unsecured revolving credit facility	$ 0					$ 0
Deferred financing costs, net	(17,329,000)					(10,904,000)
Total	720,830,000					759,016,000
Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	723,221,000					752,840,000
Total principal	1,588,221,000					1,617,840,000
Unamortized premiums, net of unamortized discount	(2,301,000)					905,000
Deferred financing costs, net	(8,630,000)					(6,414,000)
Total	1,577,290,000					1,612,331,000
1333 Broadway | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 66,872,000					67,656,000
Stated Rate (as a percent)	6.32%
Effective Rate (as a percent)	3.73%
1400 Broadway - First Lien | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 66,909,000					67,714,000
Stated Rate (as a percent)	6.12%
Effective Rate (as a percent)	3.37%
1400 Broadway - Second Lien | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 9,226,000					9,389,000
Stated Rate (as a percent)	3.35%
Effective Rate (as a percent)	3.36%
111 West 33rd Street - First Lien | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 74,356,000					75,261,000
Stated Rate (as a percent)	6.01%
Effective Rate (as a percent)	3.32%
111 West 33rd Street - Second Lien | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 9,405,000					9,509,000
Stated Rate (as a percent)	6.56%
Effective Rate (as a percent)	3.62%
1350 Broadway | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 37,302,000					37,764,000
Stated Rate (as a percent)	5.87%
Effective Rate (as a percent)	3.71%
Metro Center | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 94,464,000					95,985,000
Stated Rate (as a percent)	3.59%
Effective Rate (as a percent)	3.66%
10 Union Square | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 50,000,000					50,000,000
Stated Rate (as a percent)	3.70%
Effective Rate (as a percent)	3.97%
1542 Third Avenue | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 30,000,000					17,795,000
Stated Rate (as a percent)	4.29%			4.23%	4.29%
Effective Rate (as a percent)	4.68%
Face amount					$ 30,000,000.0
First Stamford Place | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 180,000,000					235,067,000
Stated Rate (as a percent)	4.28%		4.28%
Effective Rate (as a percent)	4.67%
Face amount			$ 180,000,000.0
First Stamford Place - First Lien | Fixed rate mortgage debt
Debt Instrument [Line Items]
Stated Rate (as a percent)	4.09%		4.09%
Face amount	$ 164,000,000		$ 164,000,000.0
First Stamford Place - Second Lien | Fixed rate mortgage debt
Debt Instrument [Line Items]
Stated Rate (as a percent)	6.25%		6.25%
Face amount	$ 16,000,000		$ 16,000,000.0
1010 Third Avenue and 77 West 55th Street | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 39,885,000					26,502,000
Stated Rate (as a percent)	4.01%		4.01%
Effective Rate (as a percent)	4.45%
Face amount			$ 40,000,000.0
10 Bank Street | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 34,802,000					31,544,000
Stated Rate (as a percent)	4.23%
Effective Rate (as a percent)	4.54%
Face amount				$ 35,000,000.0
383 Main Avenue | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 30,000,000					28,654,000
Stated Rate (as a percent)	4.44%		4.44%
Effective Rate (as a percent)	4.77%
Face amount			$ 30,000,000.0
Senior unsecured notes - exchangeable | Convertible Debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 250,000,000					250,000,000
Stated Rate (as a percent)	2.625%						2.625%
Effective Rate (as a percent)	3.93%
Face amount							$ 250,000,000.0
Senior unsecured notes, Series A | Senior notes
Debt Instrument [Line Items]
Total	$ 100,000,000					100,000,000
Stated Rate (as a percent)	3.93%
Effective Rate (as a percent)	4.00%
Senior unsecured notes, Series B | Senior notes
Debt Instrument [Line Items]
Total	$ 125,000,000					125,000,000
Stated Rate (as a percent)	4.09%
Effective Rate (as a percent)	4.17%
Senior unsecured notes, Series C | Senior notes
Debt Instrument [Line Items]
Total	$ 125,000,000					125,000,000
Stated Rate (as a percent)	4.18%
Effective Rate (as a percent)	4.26%
Unsecured revolving credit facility | Revolving credit facility
Debt Instrument [Line Items]
Unsecured revolving credit facility	$ 0					0
Effective Rate (as a percent)	2.33%
Unsecured revolving credit facility | Revolving credit facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.10%
Unsecured term loan facility | Revolving credit facility
Debt Instrument [Line Items]
Unsecured revolving credit facility	$ 265,000,000					$ 265,000,000
Stated Rate (as a percent)	3.35%
Fixed pay rate (as a percent)		2.1485%
Unsecured term loan facility | Revolving credit facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.20%

XML

Debt - Mortgage Debt (Details) - Mortgages - USD ($)	Sep. 30, 2017	Jun. 30, 2017	May 31, 2017	Apr. 30, 2017
1542 Third Avenue
Debt Instrument [Line Items]
Face amount				$ 30,000,000.0
Stated rate (as a percent)	4.29%		4.23%	4.29%
10 Bank Street
Debt Instrument [Line Items]
Face amount			$ 35,000,000.0
Stated rate (as a percent)	4.23%
First Stamford Place
Debt Instrument [Line Items]
Face amount		$ 180,000,000.0
Stated rate (as a percent)	4.28%	4.28%
First Stamford Place - First Lien
Debt Instrument [Line Items]
Face amount	$ 164,000,000	$ 164,000,000.0
Stated rate (as a percent)	4.09%	4.09%
First Stamford Place - Second Lien
Debt Instrument [Line Items]
Face amount	$ 16,000,000	$ 16,000,000.0
Stated rate (as a percent)	6.25%	6.25%
1010 Third Avenue and 77 West 55th Street
Debt Instrument [Line Items]
Face amount		$ 40,000,000.0
Stated rate (as a percent)	4.01%	4.01%
383 Main Avenue
Debt Instrument [Line Items]
Face amount		$ 30,000,000.0
Stated rate (as a percent)	4.44%	4.44%

XML

Debt - Aggregate Required Principal Payments (Details) - Mortgages - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Amortization
2017, amortization	$ 1,983
2018, amortization	4,417
2019, amortization	3,790
2020, amortization	3,938
2021, amortization	4,090
Thereafter, amortization	43,407
Total, amortization	61,625
Maturities
2017, maturities	0
2018, maturities	262,210
2019, maturities	250,000
2020, maturities	0
2021, maturities	0
Thereafter, maturities	1,014,386
Total, maturities	1,526,596
Total long term debt
2017	1,983
2018	266,627
2019	253,790
2020	3,938
2021	4,090
Thereafter	1,057,793
Total	$ 1,588,221	$ 1,617,840

XML

Debt - Deferred Financing Costs, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Financing costs	$ 23,333		$ 23,333		$ 23,145
Less: accumulated amortization	(6,004)		(6,004)		(12,241)
Total deferred financing costs, net	17,329		17,329		10,904
Amortization of deferred financing costs	1,000	$ 1,300	3,600	$ 3,700
Unsecured term loan facility | Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Net deferred financing costs	$ 8,700		$ 8,700		$ 4,500

XML

Debt - Unsecured Revolving Credit and Term Loan Facility (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) option	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) option	Sep. 30, 2016 USD ($)	Aug. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Line of Credit Facility [Line Items]
Loss on early extinguishment of debt	$ 2,157,000	$ 0	$ 2,157,000	$ 552,000
Unsecured revolving credit facility	0		0			$ 0
Unsecured Revolving Credit Facility And Term Loan | Unsecured term loan facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	1,365,000,000.000		1,365,000,000.000
Unsecured revolving credit facility higher borrowing capacity option					$ 1,750,000,000.00
Unsecured Revolving Credit Facility | Unsecured term loan facility
Line of Credit Facility [Line Items]
Current borrowing capacity	1,100,000,000.0		1,100,000,000.0
Unsecured revolving credit facility	$ 0		$ 0			0
Number of options to extend maturity | option	2		2
Extension period			6 months
Term loan facility | Unsecured term loan facility
Line of Credit Facility [Line Items]
Current borrowing capacity	$ 265,000,000		$ 265,000,000
Unsecured revolving credit facility	$ 265,000,000		$ 265,000,000			$ 265,000,000
Minimum | Unsecured Revolving Credit Facility | Unsecured term loan facility
Line of Credit Facility [Line Items]
Extension fee, as a percent of outstanding commitments under revolving credit facility			0.0625%
Maximum | Unsecured Revolving Credit Facility | Unsecured term loan facility
Line of Credit Facility [Line Items]
Extension fee, as a percent of outstanding commitments under revolving credit facility			0.075%

XML

Debt - Exchangeable Senior Notes (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Aug. 31, 2014 USD ($) $ / shares
Debt Instrument [Line Items]
Amortization of deferred financing costs	$ 1,000,000	$ 1,300,000	$ 3,600,000	$ 3,700,000
Convertible Debt | Exchangeable Senior Notes due August 15, 2019
Debt Instrument [Line Items]
Face amount					$ 250,000,000.0
Stated rate (as a percent)	2.625%		2.625%		2.625%
Shares converted (in shares)			0.0517101
Conversion price (in USD per share) | $ / shares					$ 19.34
Debt interest expense	$ 2,400,000	2,400,000	$ 7,300,000	7,300,000
Contractual interest expense	1,600,000	1,600,000	4,900,000	4,900,000
Accretion of debt discount	700,000	700,000	2,000,000	2,000,000
Amortization of deferred financing costs	$ 100,000	$ 100,000	$ 400,000	$ 400,000

XML

Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Accounts payable and accrued expenses	$ 106,420	$ 102,866
Payable to the estate of Leona M. Helmsley	18,367	18,367
Interest rate swap agreements liability	13,378	5,591
Accrued interest payable	3,903	6,230
Due to affiliated companies	622	1,010
Accounts payable and accrued expenses	$ 142,690	$ 134,064

XML

Financial Instruments and Fair Values - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap agreements liability	$ 13,378,000		$ 13,378,000		$ 5,591,000
Change in unrealized gain (loss) on valuation of interest rate swap agreements	(1,279,000)	$ 930,000	(14,252,000)	$ (29,305,000)
Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap agreements liability	13,400,000		13,400,000
Designated as Hedging Instrument | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in unrealized gain (loss) on valuation of interest rate swap agreements	(1,600,000)	$ 900,000	(14,700,000)	$ (29,300,000)
Amount expected to be reclassified within twelve months			2,900,000
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional amount	790,000,000		790,000,000
Accounts payable and accrued expenses | Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap agreements liability	$ 13,400,000		$ 13,400,000		5,600,000
Prepaid expenses and other assets | Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap agreements asset					$ 600,000

XML

Financial Instruments and Fair Values - Summary of the Terms of Agreements and the Fair Value of Derivative Financial Instruments (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Loss from derivative financial instruments	$ 0	$ 0	$ 289,000	$ 0
Designated as Hedging Instrument | Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Asset	0		0				$ 614,000
Liability	(13,378,000)		(13,378,000)				(5,591,000)
Designated as Hedging Instrument | Cash Flow Hedging | LIBOR | Interest Rate Swap, One Month LIBOR, 2.1485%
Derivatives, Fair Value [Line Items]
Notional Amount	$ 265,000,000		$ 265,000,000
Pay Rate (as a percent)	2.1485%		2.1485%
Asset	$ 0		$ 0				0
Liability	(3,436,000)		(3,436,000)				(1,634,000)
Designated as Hedging Instrument | Cash Flow Hedging | LIBOR | Two Interest Rate Swaps, Three Month LIBOR, 2.5050%
Derivatives, Fair Value [Line Items]
Notional amount, terminated					$ 180,000,000.0
Deferred losses on terminated hedges	5,900,000		5,900,000
Designated as Hedging Instrument | Cash Flow Hedging | LIBOR | Interest Rate Swap, Three Month LIBOR, 2.5050%
Derivatives, Fair Value [Line Items]
Notional Amount	$ 100,000,000		$ 100,000,000
Pay Rate (as a percent)	2.505%		2.505%
Asset	$ 0		$ 0				0
Liability	0		0				(684,000)
Designated as Hedging Instrument | Cash Flow Hedging | LIBOR | Interest Rate Swap, Three Month LIBOR, 2.5050%, 2
Derivatives, Fair Value [Line Items]
Notional Amount	$ 80,000,000		$ 80,000,000			$ 100,000,000.0
Pay Rate (as a percent)	2.505%		2.505%
Asset	$ 0		$ 0				0
Liability	0		0				(685,000)
Notional amount, terminated						$ 20,000,000
Designated as Hedging Instrument | Cash Flow Hedging | LIBOR | Interest Rate Swap, Three Month LIBOR, 2.4860%
Derivatives, Fair Value [Line Items]
Notional Amount	$ 100,000,000		$ 100,000,000
Pay Rate (as a percent)	2.486%		2.486%
Asset	$ 0		$ 0				224,000
Liability	(1,448,000)		(1,448,000)				0
Designated as Hedging Instrument | Cash Flow Hedging | LIBOR | Interest Rate Swap, Three Month LIBOR, 2.4860%, 2
Derivatives, Fair Value [Line Items]
Notional Amount	$ 100,000,000		$ 100,000,000
Pay Rate (as a percent)	2.486%		2.486%
Asset	$ 0		$ 0				223,000
Liability	(1,448,000)		(1,448,000)				0
Designated as Hedging Instrument | Cash Flow Hedging | LIBOR | Interest Rate Swap, Three Month LIBOR, 2.4860%, 3
Derivatives, Fair Value [Line Items]
Notional Amount	$ 75,000,000		$ 75,000,000
Pay Rate (as a percent)	2.486%		2.486%
Asset	$ 0		$ 0				167,000
Liability	(1,086,000)		(1,086,000)				0
Designated as Hedging Instrument | Cash Flow Hedging | LIBOR | Interest Rate Swap, Three Month LIBOR, 2.7620%
Derivatives, Fair Value [Line Items]
Notional Amount	$ 75,000,000		$ 75,000,000
Pay Rate (as a percent)	2.762%		2.762%
Asset	$ 0		$ 0				0
Liability	(2,592,000)		(2,592,000)				(1,295,000)
Designated as Hedging Instrument | Cash Flow Hedging | LIBOR | Interest Rate Swap, Three Month LIBOR, 2.7620%, 2
Derivatives, Fair Value [Line Items]
Notional Amount	$ 75,000,000		$ 75,000,000
Pay Rate (as a percent)	2.762%		2.762%
Asset	$ 0		$ 0				0
Liability	(2,591,000)		(2,591,000)				(1,293,000)
Designated as Hedging Instrument | Cash Flow Hedging | LIBOR | Interest Rate Swap, Three Month LIBOR, 2.4625%
Derivatives, Fair Value [Line Items]
Notional Amount	$ 100,000,000		$ 100,000,000
Pay Rate (as a percent)	2.46245%		2.46245%
Asset	$ 0		$ 0				0
Liability	(777,000)		(777,000)				$ 0
Other expense | Designated as Hedging Instrument | Cash Flow Hedging | LIBOR | Interest Rate Swap, Three Month LIBOR, 2.5050%, 2
Derivatives, Fair Value [Line Items]
Loss from derivative financial instruments	$ 0	$ 0	$ 300,000	$ 0

XML

Financial Instruments and Fair Values - Effect of Derivative Financial Instruments Designated as Cash Flow Hedges (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense	$ (16,890)	$ (17,939)	$ (52,109)	$ (52,758)
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in other comprehensive income (loss)	(1,638)	930	(14,654)	(29,305)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense	(359)	0	(402)	0
Reclassification out of Accumulated Other Comprehensive Income | Accumulated net gain (loss) from cash flow hedges | Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense	$ (359)	$ 0	$ (402)	$ 0

XML

Financial Instruments and Fair Values - Summary of the Carrying and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in accounts payable and accrued expenses	$ 13,378	$ 5,591
Carrying Value | Mortgages
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	720,830	759,016
Carrying Value | Exchangeable notes | Senior unsecured notes - exchangeable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	243,923	241,474
Carrying Value | Senior notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	348,991	348,914
Estimated Fair Value | Mortgages
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	712,365	755,640
Estimated Fair Value | Exchangeable notes | Senior unsecured notes - exchangeable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	281,068	282,435
Estimated Fair Value | Senior notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	344,267	339,274
Level 1 | Estimated Fair Value | Mortgages
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Level 1 | Estimated Fair Value | Exchangeable notes | Senior unsecured notes - exchangeable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Level 1 | Estimated Fair Value | Senior notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Level 2 | Estimated Fair Value | Mortgages
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Level 2 | Estimated Fair Value | Exchangeable notes | Senior unsecured notes - exchangeable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	281,068	282,435
Level 2 | Estimated Fair Value | Senior notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Level 3 | Estimated Fair Value | Mortgages
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	712,365	755,640
Level 3 | Estimated Fair Value | Exchangeable notes | Senior unsecured notes - exchangeable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Level 3 | Estimated Fair Value | Senior notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	344,267	339,274
Unsecured term loan facility | Carrying Value | Term loan facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	263,546	262,927
Unsecured term loan facility | Estimated Fair Value | Term loan facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	265,000	265,000
Unsecured term loan facility | Level 1 | Estimated Fair Value | Term loan facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Unsecured term loan facility | Level 2 | Estimated Fair Value | Term loan facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Unsecured term loan facility | Level 3 | Estimated Fair Value | Term loan facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	265,000	265,000
Interest Rate Swap
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in accounts payable and accrued expenses	13,400
Interest Rate Swap | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in prepaid expenses and other assets	0	614
Interest rate swaps included in accounts payable and accrued expenses	13,378	5,591
Interest Rate Swap | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in prepaid expenses and other assets	0	614
Interest rate swaps included in accounts payable and accrued expenses	13,378	5,591
Interest Rate Swap | Level 1 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in prepaid expenses and other assets	0	0
Interest rate swaps included in accounts payable and accrued expenses	0	0
Interest Rate Swap | Level 2 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in prepaid expenses and other assets	0	614
Interest rate swaps included in accounts payable and accrued expenses	13,378	5,591
Interest Rate Swap | Level 3 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in prepaid expenses and other assets	0	0
Interest rate swaps included in accounts payable and accrued expenses	$ 0	$ 0

XML

Rental Income - Narrative (Details)	9 Months Ended
	Sep. 30, 2017
Minimum
Operating Leases [Line Items]
Term of lease	1 year
Maximum
Operating Leases [Line Items]
Term of lease	16 years

XML

Commitments and Contingencies - Legal Proceedings (Details)	Oct. 14, 2014 participant
New York State Supreme Court, New York County
Loss Contingencies [Line Items]
Number of plaintiffs opting out of settlement	12

XML

Commitments and Contingencies - Unfunded Capital Expenditures (Details) $ in Millions	Sep. 30, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Unfunded capital expenditures	$ 78.2

XML

Commitments and Contingencies - Aggregate Required Payments on Ground Leases (Details) - Ground leases $ in Thousands	Sep. 30, 2017 USD ($)
Operating Leased Assets [Line Items]
2017	$ 380
2018	1,518
2019	1,518
2020	1,518
2021	1,518
Thereafter	55,212
Aggregate required payments on ground leases	$ 61,664

XML

Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Class of Stock [Line Items]
Gross proceeds from sale of shares	$ 0	$ 611,278	$ 621,800
Common shares | Class A common shares
Class of Stock [Line Items]
Issuance of common shares (in shares)			29,610,854
Common shares issued (in dollars per share)			$ 21.00
QIA
Class of Stock [Line Items]
Interest held by QIA (as a percent)			9.90%
QIA | Common shares | Class A common shares
Class of Stock [Line Items]
Interest held by QIA (as a percent)			19.40%

XML

Equity - Shares and Units (Details)	9 Months Ended
	Sep. 30, 2017 shares
Equity [Abstract]
OP Unit, redemption term for cash	1 year
Dividends on common stock received until performance criteria met for LTIP units (as a percent)	10.00%
Dividends on common stock received after performance criteria met for LTIP units (as a percent)	90.00%
Dividends on common stock received in periods after performance criteria met for LTIP units (as a percent)	100.00%
OP units outstanding (in shares)	300,416,821
OP units owned by the Company (in shares)	159,427,448
OP units owned by the Company (as a percent)	53.10%
OP units not owned by the Company (in shares)	140,989,373
OP units not owned by the Company (as a percent)	46.90%

XML

Equity - Change in Net Income Attributable to Common Shareholders (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Class of Stock [Line Items]
Net income attributable to common stockholders	$ 18,806	$ 15,973	$ 45,375	$ 34,490
Increase in additional paid-in capital for the conversion of OP Units into common stock			0
Change from net income attributable to common stockholders and transfers from non-controlling interests	20,759	20,989	56,462	54,707
Additional Paid-In Capital
Class of Stock [Line Items]
Increase in additional paid-in capital for the conversion of OP Units into common stock	$ 1,953	$ 5,016	$ 11,087	$ 20,217

XML

Equity - Dividends and Distributions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Equity [Abstract]
Dividends paid to common shareholders	$ 16,700	$ 16,200	$ 49,800	$ 39,500
Distributions paid to OP unitholders	14,800	15,100	44,600	43,100
Private perpetual preferred unit distributions	$ 200	$ 200	$ 702	$ 702

XML

Equity - Incentive and Share-Based Compensation (Details) $ / shares in Units, $ in Millions	1 Months Ended				3 Months Ended		9 Months Ended		12 Months Ended
	May 31, 2017 USD ($) shares	Mar. 31, 2017 USD ($) vesting_installment shares	Jun. 30, 2016 USD ($) shares	Feb. 29, 2016 USD ($) vesting_installment shares	Sep. 30, 2017 USD ($) shares	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2016 USD ($) $ / shares	Dec. 31, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average per unit or share fair value (in USD per share) | $ / shares							$ 13.77
Expected volatility rate look-back period							6 years
Age of grantee at which LTIP unit and restricted stock awards immediately vest							60 years
Period of service, upon completion of which, grantee's LTIP unit and restricted stock awards will immediately vest							10 years
2013 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under the plan (in shares) | shares					12,200,000.0		12,200,000.0
Number of shares that remain available for future issuance (in shares) | shares					7,000,000		7,000,000
Long-Term Incentive Plan Unit and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period | $							$ 19.4	$ 18.4
Weighted-average per unit or share fair value (in USD per share) | $ / shares							$ 13.77	$ 9.60
Expected term							2 years 9 months 18 days	2 years 9 months 18 days
Dividend rate (as a percent)							2.05%	2.10%
Risk-free interest rate (as a percent)							1.55%	0.84%
Expected price volatility (as a percent)							20.00%	24.00%
Long-Term Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares							1,372,574
Time Based Long-Tern Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares		47,993		47,168
Fair value of share-based awards granted in period | $		$ 1.6		$ 1.4					$ 0.1
Performance Based Long-Term Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares		95,156		112,925
Fair value of share-based awards granted in period | $		$ 1.0		$ 0.8
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares							34,407
Time Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares		34,407		44,198
Awards that Meet Age and Service Requirements for Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Noncash share-based compensation expense recognized | $					$ 0.2	$ 0.1	$ 0.9	$ 0.6
Unrecognized compensation expense | $					0.9		$ 0.9
Unrecognized compensation expense, period for recognition							2 years 5 months 12 days
Awards that Do Not Meet Age and Service Requirements for Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Noncash share-based compensation expense recognized | $					3.7	$ 2.5	$ 9.9	$ 6.7
Unrecognized compensation expense | $					$ 26.5		$ 26.5
Unrecognized compensation expense, period for recognition							2 years 6 months 12 days
Executive Officer | 2013 Plan Units, granted in March 2017 | Time Based Long-Tern Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares		313,275
Fair value of share-based awards granted in period | $		$ 6.1
Award vesting period		4 years
Number of vesting installments | vesting_installment		3
Executive Officer | 2013 Plan Units, granted in March 2017 | Performance Based Long-Term Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares		865,742
Fair value of share-based awards granted in period | $		$ 9.6
Award vesting period		3 years
Number of vesting installments | vesting_installment		2
Executive Officer | 2013 Plan Units Vesting January 2019 | Time Based Long-Tern Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares				368,225
Fair value of share-based awards granted in period | $				$ 5.6
Award vesting period				4 years
Number of vesting installments | vesting_installment				3
Executive Officer | 2013 Plan Units Vesting January 2019 | Performance Based Long-Term Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares				1,230,228
Fair value of share-based awards granted in period | $				$ 8.8
Award vesting period				3 years
Number of vesting installments | vesting_installment				2
Executive Officer | 2013 Plan Units Vesting three years after February 2016 | Time Based Long-Tern Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares				62,814
Fair value of share-based awards granted in period | $				$ 1.0
Award vesting percentage after three years (as a percent)							30.00%
Award vesting percentage after four years (as a percent)							30.00%
Award vesting percentage after five years (as a percent)							40.00%
Director | 2013 Plan Units, granted in May 2017 | Time Based Long-Tern Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares	50,408
Fair value of share-based awards granted in period | $	$ 1.0
Award vesting period	3 years		3 years
Director | 2013 Plan Units Vesting three years after June 2016 | Time Based Long-Tern Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares			43,257
Fair value of share-based awards granted in period | $			$ 0.8

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Equity - Summary of Restricted Stock and LTIP Unit Activity (Details)	9 Months Ended
	Sep. 30, 2017 $ / shares shares
Weighted Average Grant Fair Value [Roll Forward]
Beginning balance, Unvested, Weighted Average Grant Fair Value (in USD per share) | $ / shares	$ 10.01
Vested, Weighted Average Grant Fair Value (in USD per share) | $ / shares	13.74
Granted, Weighted Average Grant Fair Value (in USD per share) | $ / shares	13.77
Forfeited or unearned, Weighted Average Grant Fair Value (in USD per share) | $ / shares	5.36
Ending balance, Unvested, Weighted Average Grant Fair Value (in USD per share) | $ / shares	$ 11.11
Restricted Stock
Restricted Stock and LTIP Unit Activity [Roll Forward]
Beginning balance, Unvested (in shares)	107,793
Vested (in shares)	(17,923)
Granted (in shares)	34,407
Forfeited or unearned (in shares)	(2,509)
Ending balance, Unvested (in shares)	121,768
Long-Term Incentive Plan Unit
Restricted Stock and LTIP Unit Activity [Roll Forward]
Beginning balance, Unvested (in shares)	2,881,629
Vested (in shares)	(323,982)
Granted (in shares)	1,372,574
Forfeited or unearned (in shares)	(77,227)
Ending balance, Unvested (in shares)	3,852,994

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Equity - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator - Basic:
Net income	$ 35,489	$ 32,897	$ 85,993	$ 74,242
Private perpetual preferred unit distributions	(234)	(234)	(702)	(702)
Net income attributable to non-controlling interests	(16,449)	(16,690)	(39,916)	(39,050)
Earnings allocated to unvested shares	(11)	(11)	(28)	(27)
Net income attributable to common stockholders - basic	18,795	15,962	45,347	34,463
Numerator - Diluted:
Net income	35,489	32,897	85,993	74,242
Private perpetual preferred unit distributions	(234)	(234)	(702)	(702)
Earnings allocated to unvested shares	(11)	(11)	(28)	(27)
Net income attributable to common stockholders - diluted	$ 35,244	$ 32,652	$ 85,263	$ 73,513
Denominator:
Weighted average shares outstanding - basic (in shares)	158,102,000	136,831,000	157,796,000	126,740,000
Operating partnership units (in shares)	138,287,000	141,908,000	138,593,000	143,648,000
Effect of dilutive securities:
Stock-based compensation plans (in shares)	762,000	1,090,000	848,000	378,000
Exchangeable senior notes (in shares)	720,000	785,000	852,000	262,000
Weighted average shares outstanding - diluted (in shares)	297,871,000	280,614,000	298,089,000	271,028,000
Earnings per share:
Basic (in USD per share)	$ 0.12	$ 0.12	$ 0.29	$ 0.27
Diluted (in USD per share)	$ 0.12	$ 0.12	$ 0.29	$ 0.27
Antidilutive securities (in shares)	954,533	1,033,044	840,092	757,119

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Related Party Transactions - Narrative (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2016 ft² property	Sep. 30, 2017 USD ($) ft² property director	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) ft² property director	Sep. 30, 2016 USD ($)
Related Party Transaction [Line Items]
Area of real estate property (in square feet) | ft²		10,100,000		10,100,000
Number of directors | director		1		1
Affiliated entities | Supervisory fee revenue
Related Party Transaction [Line Items]
Revenue from related parties		$ 300	$ 300	$ 900	$ 1,100
Affiliated entities | Property management fee revenue
Related Party Transaction [Line Items]
Revenue from related parties		$ 100	100	$ 200	300
Affiliated entities | Leased space rental
Related Party Transaction [Line Items]
Revenue from related parties			$ 70		200
Area of real estate property (in square feet) | ft²		3,074		3,074
Number of properties | property	1	1		1
Notice period for lease cancellation	90 days
Affiliated entities | Annualized rent revenue
Related Party Transaction [Line Items]
Revenue from related parties				$ 5,800	$ 5,700
Undivided interest
Related Party Transaction [Line Items]
Area of real estate property (in square feet) | ft²	5,351	647		647
Chairman emeritus | Leased space rental
Related Party Transaction [Line Items]
Percentage of lease space occupied by Chairman emeritus and employee (as a percent)	15.00%
Revenue from related parties, net of payment for pro rata share of leased space		$ 100		$ 300

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Segment Reporting - Narrative (Details)	9 Months Ended
	Sep. 30, 2017 segment
Segment Reporting [Abstract]
Number of reportable segments	2

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Segment Reporting - Components of Segment Profit for Each Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Revenues:
Rental revenue	$ 122,391	$ 115,634	$ 360,348	$ 343,155
Intercompany rental revenue	0	0	0	0
Tenant expense reimbursement	20,346	19,176	53,889	56,350
Observatory revenue	39,306	38,093	94,212	91,112
Third-party management and other fees	345	404	1,088	1,372
Other revenue and fees	4,932	2,541	19,861	6,748
Total revenues	187,320	175,848	529,398	498,737
Operating expenses:
Property operating expenses	41,270	38,585	122,009	115,075
Intercompany rent expense	0	0	0	0
Ground rent expenses	2,331	2,331	6,994	6,994
General and administrative expenses	12,899	11,798	36,566	35,623
Observatory expenses	8,648	7,250	23,079	21,900
Real estate taxes	26,901	24,691	76,001	71,773
Acquisition expenses	0	0	0	98
Depreciation and amortization	38,490	37,607	119,868	115,382
Total operating expenses	130,539	122,262	384,517	366,845
Total operating income	56,781	53,586	144,881	131,892
Other expenses:
Interest expense	(16,890)	(17,939)	(52,109)	(52,758)
Loss on early extinguishment of debt	(2,157)	0	(2,157)	(552)
Loss from derivative financial instruments	0	0	(289)	0
Income before income taxes	37,734	35,647	90,326	78,582
Income tax expense	(2,245)	(2,750)	(4,333)	(4,340)
Net income	35,489	32,897	85,993	74,242
Segment assets	3,848,934	3,882,569	3,848,934	3,882,569	$ 3,890,953
Expenditures for segment assets	53,731	52,828	163,115	140,099
Intersegment Elimination
Revenues:
Rental revenue	0	0	0	0
Intercompany rental revenue	(23,301)	(22,983)	(57,354)	(55,189)
Tenant expense reimbursement	0	0	0	0
Observatory revenue	0	0	0	0
Third-party management and other fees	0	0	0	0
Other revenue and fees	0	0	0	0
Total revenues	(23,301)	(22,983)	(57,354)	(55,189)
Operating expenses:
Property operating expenses	0	0	0	0
Intercompany rent expense	(23,301)	(22,983)	(57,354)	(55,189)
Ground rent expenses	0	0	0	0
General and administrative expenses	0	0	0	0
Observatory expenses	0	0	0	0
Real estate taxes	0	0	0	0
Acquisition expenses		0	0	0
Depreciation and amortization	0	0	0	0
Total operating expenses	(23,301)	(22,983)	(57,354)	(55,189)
Total operating income	0	0	0	0
Other expenses:
Interest expense	0	0	0	0
Loss on early extinguishment of debt	0	0	0	0
Loss from derivative financial instruments	0	0	0	0
Income before income taxes	0	0	0	0
Income tax expense	0	0	0	0
Net income	0	0	0	0
Segment assets	0	0	0	0
Expenditures for segment assets	0	0	0	0
Real Estate | Operating Segments
Revenues:
Rental revenue	122,391	115,634	360,348	343,155
Intercompany rental revenue	23,301	22,983	57,354	55,189
Tenant expense reimbursement	20,346	19,176	53,889	56,350
Observatory revenue	0	0	0	0
Third-party management and other fees	345	404	1,088	1,372
Other revenue and fees	4,932	2,536	19,861	6,738
Total revenues	171,315	160,733	492,540	462,804
Operating expenses:
Property operating expenses	41,270	38,585	122,009	115,075
Intercompany rent expense	0	0	0	0
Ground rent expenses	2,331	2,331	6,994	6,994
General and administrative expenses	12,899	11,798	36,566	35,623
Observatory expenses	0	0	0	0
Real estate taxes	26,901	24,691	76,001	71,773
Acquisition expenses		0	0	98
Depreciation and amortization	38,473	37,421	119,764	115,002
Total operating expenses	121,874	114,826	361,334	344,565
Total operating income	49,441	45,907	131,206	118,239
Other expenses:
Interest expense	(16,890)	(17,939)	(52,109)	(52,758)
Loss on early extinguishment of debt	(2,157)	0	(2,157)	(552)
Loss from derivative financial instruments	0	0	(289)	0
Income before income taxes	30,394	27,968	76,651	64,929
Income tax expense	(264)	(332)	(960)	(1,018)
Net income	30,130	27,636	75,691	63,911
Segment assets	3,582,935	3,636,262	3,582,935	3,636,262
Expenditures for segment assets	40,320	52,828	142,854	140,052
Observatory | Operating Segments
Revenues:
Rental revenue	0	0	0	0
Intercompany rental revenue	0	0	0	0
Tenant expense reimbursement	0	0	0	0
Observatory revenue	39,306	38,093	94,212	91,112
Third-party management and other fees	0	0	0	0
Other revenue and fees	0	5	0	10
Total revenues	39,306	38,098	94,212	91,122
Operating expenses:
Property operating expenses	0	0	0	0
Intercompany rent expense	23,301	22,983	57,354	55,189
Ground rent expenses	0	0	0	0
General and administrative expenses	0	0	0	0
Observatory expenses	8,648	7,250	23,079	21,900
Real estate taxes	0	0	0	0
Acquisition expenses		0	0	0
Depreciation and amortization	17	186	104	380
Total operating expenses	31,966	30,419	80,537	77,469
Total operating income	7,340	7,679	13,675	13,653
Other expenses:
Interest expense	0	0	0	0
Loss on early extinguishment of debt	0	0	0	0
Loss from derivative financial instruments	0	0	0	0
Income before income taxes	7,340	7,679	13,675	13,653
Income tax expense	(1,981)	(2,418)	(3,373)	(3,322)
Net income	5,359	5,261	10,302	10,331
Segment assets	265,999	246,307	265,999	246,307
Expenditures for segment assets	$ 13,411	$ 0	$ 20,261	$ 47