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, 2016

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: 001-36106

EMPIRE STATE REALTY OP, L.P.

(Exact name of Registrant as specified in its charter)

Delaware	45-4685158
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

111 West 33rd Street

New York, New York 10120

(Address of principal executive offices) (Zip Code)

(212) 687-8700

(Registrant's telephone number, including area code)

Former Address

One Grand Central Place

60 East 42nd Street

New York, New York 10165

(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

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.

As of November 1, 2016, there were 36,023,638 units of the Registrant Series ES operating partnership units outstanding, 9,753,105 units of the Series 60 operating partnership units outstanding, and 4,809,410 units of the Series 250 operating partnership units outstanding.

	EMPIRE STATE REALTY OP, L.P.
	FORM 10-Q FOR THE QUARTER ENDED SEPTEMBER 30, 2016
	TABLE OF CONTENTS	PAGE
PART 1.	FINANCIAL INFORMATION
ITEM 1.	FINANCIAL STATEMENTS
	Condensed Consolidated Balance Sheets as of September 30, 2016 (unaudited) and December 31, 2015	2
	Condensed Consolidated Statements of Income for the three and nine months ended September 30, 2016 and 2015 (unaudited)	3
	Condensed Consolidated Statements of Comprehensive Income for the three and nine months ended September 30, 2016 and 2015 (unaudited)	4
	Condensed Consolidated Statements of Stockholders' Equity for the nine months ended September 30, 2016 (unaudited)	5
	Condensed Consolidated Statements of Cash Flows for the nine months ended September 30, 2016 and 2015 (unaudited)	6
	Notes to Condensed Consolidated Financial Statements (unaudited)	8
ITEM 2.	MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	31
ITEM 3.	QUANTITATIVE AND QUALITATIVE DISCLOSURE ABOUT MARKET RISK	47
ITEM 4.	CONTROLS AND PROCEDURES	47
PART II.	OTHER INFORMATION	48
ITEM 1.	LEGAL PROCEEDINGS	48
ITEM 1A.	RISK FACTORS	48
ITEM 2.	UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS	50
ITEM 3.	DEFAULTS UPON SENIOR SECURITIES	50
ITEM 4.	MINE SAFETY DISCLOSURES	50
ITEM 5.	OTHER INFORMATION	50
ITEM 6.	EXHIBITS	50
SIGNATURES		51

1

ITEM 1. FINANCIAL STATEMENTS

Empire State Realty OP, L.P.

Condensed Consolidated Balance Sheets

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

	September 30, 2016			December 31, 2015
ASSETS	(unaudited)
Commercial real estate properties, at cost:
Land	$	201,196		$	201,196
Development costs	7,946			7,498
Building and improvements	2,196,864			2,067,636
	2,406,006			2,276,330
Less: accumulated depreciation	(532,406		)	(465,584		)
Commercial real estate properties, net	1,873,600			1,810,746
Cash and cash equivalents	594,297			46,685
Restricted cash	60,752			65,880
Tenant and other receivables, net of allowance of $4,242 and $2,792 in 2016 and 2015, respectively	19,569			18,782
Deferred rent receivables, net of allowance of $228 and $245 in 2016 and 2015, respectively	143,578			122,048
Prepaid expenses and other assets	33,685			50,460
Deferred costs, net	287,591			310,679
Acquired below-market ground leases, net	378,018			383,891
Goodwill	491,479			491,479
Total assets	$	3,882,569		$	3,300,650
LIABILITIES AND CAPITAL
Liabilities:
Mortgage notes payable, net	$	763,457		$	747,661
Senior unsecured notes, net	589,546			587,018
Unsecured term loan facility, net	262,830			262,545
Unsecured revolving credit facility, net	—			35,192
Accounts payable and accrued expenses	154,573			111,099
Acquired below-market leases, net	87,708			104,171
Deferred revenue and other liabilities	24,176			31,388
Tenants’ security deposits	47,440			48,890
Total liabilities	1,929,730			1,927,964
Commitments and contingencies
Capital:
Private perpetual preferred units, $16.62 per unit liquidation preference, 1,560,360 issued and outstanding in 2016 and 2015	8,004			8,004
Series PR operating partnership units:
ESRT partner's capital (2,990,995 and 2,675,740 general partner operating partnership units and 151,934,649 and 117,347,639 limited partner operating partnership units outstanding in 2016 and 2015, respectively)	1,137,558			524,729
Limited partners' interests (93,507,101 and 93,863,451 limited partner operating partnership units outstanding in 2016 and 2015, respectively)	785,294			809,901
Series ES operating partnership units (36,061,948 and 38,262,650 limited partner operating partnership units outstanding in 2016 and 2015, respectively)	16,291			22,074
Series 60 operating partnership units (9,794,230 and 10,318,492 limited partner operating partnership units outstanding in 2016 and 2015, respectively)	3,845			5,366
Series 250 operating partnership units (4,810,610 and 5,106,039 limited partner operating partnership units outstanding in 2016 and 2015, respectively)	1,847			2,612
Total capital	1,952,839			1,372,686
Total liabilities and capital	$	3,882,569		$	3,300,650

The accompanying notes are an integral part of these financial statements

2

Empire State Realty OP, L.P.

Condensed Consolidated Statements of Income

(unaudited)

(amounts in thousands, except per unit amounts)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Revenues:
Rental revenue	$	115,634		$	110,903		$	343,155		$	333,827
Tenant expense reimbursement	19,176			23,096			56,350			59,878
Observatory revenue	38,093			35,702			91,112			84,525
Construction revenue	—			—			—			1,981
Third-party management and other fees	404			618			1,372			1,658
Other revenue and fees	2,541			5,460			6,748			10,565
Total revenues	175,848			175,779			498,737			492,434
Operating expenses:
Property operating expenses	38,585			41,052			115,075			120,341
Ground rent expenses	2,331			2,331			6,994			6,994
General and administrative expenses	11,798			10,182			35,623			28,395
Observatory expenses	7,250			7,896			21,900			23,391
Construction expenses	—			—			—			3,222
Real estate taxes	24,691			23,613			71,773			69,543
Acquisition expenses	—			193			98			193
Depreciation and amortization	37,607			45,169			115,382			126,216
Total operating expenses	122,262			130,436			366,845			378,295
Total operating income	53,586			45,343			131,892			114,139
Interest expense	(17,939		)	(16,680		)	(53,310		)	(50,298		)
Income before income taxes	35,647			28,663			78,582			63,841
Income tax expense	(2,750		)	(2,578		)	(4,340		)	(3,283		)
Net income	32,897			26,085			74,242			60,558
Private perpetual preferred unit distributions	(234		)	(234		)	(702		)	(702		)
Net income attributable to common unitholders	$	32,663		$	25,851		$	73,540		$	59,856
Total weighted average units:
Basic	278,739			265,873			270,388			265,868
Diluted	280,614			265,873			271,028			265,868
Earnings per unit attributable to common unitholders:
Basic	$	0.12		$	0.10		$	0.27		$	0.22
Diluted	$	0.12		$	0.10		$	0.27		$	0.22
Dividends per unit	$	0.105		$	0.085		$	0.295		$	0.255

The accompanying notes are an integral part of these financial statements

3

Empire State Realty OP, L.P.

Condensed Consolidated Statements of Comprehensive Income

(unaudited)

(amounts in thousands)

	Three Months Ended September 30,					Nine Months Ended September 30,
	2016		2015			2016			2015
Net income	$	32,897	$	26,085		$	74,242		$	60,558
Other comprehensive income (loss):
Change in unrealized gain (loss) on valuation of interest rate swap agreements	930		(4,384		)	(29,305		)	(4,384		)
Other comprehensive income (loss)	930		(4,384		)	(29,305		)	(4,384		)
Comprehensive income	$	33,827	$	21,701		$	44,937		$	56,174

The accompanying notes are an integral part of these financial statements

4

Empire State Realty OP, L.P.

Condensed Consolidated Statements of Capital

For The Nine Months Ended September 30, 2016

(unaudited)

(amounts in thousands)

					Series PR Operating Partnership Units									Series ES Operating Partnership Units Limited Partners					Series 60 Operating Partnership Units Limited Partners					Series 250 Operating Partnership Units Limited Partners
					General Partner				Limited Partners
	Private Perpetual Preferred Units	Private Perpetual Preferred Unitholders			Operating Partnership Units	Operating Partnership Unitholders			Operating Partnership Units		Operating Partnership Unitholders			Operating Partnership Units		Operating Partnership Unitholders			Operating Partnership Units		Operating Partnership Unitholders			Operating Partnership Units		Operating Partnership Unitholders			Total Capital
Balance at December 31, 2015	1,560	$	8,004		120,023	$	524,729		93,863		$	809,901		38,262		$	22,074		10,318		$	5,366		5,106		$	2,612		$	1,372,686
Issuance of OP units, net of costs	—	—			29,611	611,278			—		—			—		—			—		—			—		—			611,278
Conversion of operating partnership units to ESRT Partner's Capital	—	—			5,245	19,941			(2,225	)	(18,687		)	(2,201	)	(960		)	(524	)	(191		)	(295	)	(103		)	—
Equity compensation	—	—			46	355			1,869		6,899			—		—			—		—			—		—			7,254
Distributions	—	(702		)		(39,491		)	—		(27,814		)	—		(10,883		)	—		(2,967		)	—		(1,459		)	(83,316		)
Net income	—	702			—	34,490			—		24,930			—		10,075			—		2,721			—		1,324			74,242
Unrealized loss on valuation of interest rate swap agreements	—	—			—	(13,744		)	—		(9,935		)	—		(4,015		)	—		(1,084		)	—		(527		)	(29,305		)
Balance at September 30, 2016	1,560	$	8,004		154,925	$	1,137,558		93,507		$	785,294		36,061		$	16,291		9,794		$	3,845		4,811		$	1,847		$	1,952,839

The accompanying notes are an integral part of these financial statements

5

Empire State Realty OP, L.P.

Condensed Consolidated Statements of Cash Flows

(unaudited)

(amounts in thousands)

	Nine Months Ended September 30,
	2016			2015
Cash Flows From Operating Activities
Net income	$	74,242		$	60,558
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	115,382			126,216
Amortization of deferred financing costs and debt premiums and discount	516			1,626
Amortization of acquired above- and below-market leases, net	(6,285		)	(14,662		)
Amortization of acquired below-market ground leases	5,873			5,873
Straight-lining of rental revenue	(21,495		)	(15,165		)
Equity based compensation	7,254			4,259
Increase (decrease) in cash flows due to changes in operating assets and liabilities:
Restricted cash	3,120			5,268
Tenant and other receivables	(788		)	(8,661		)
Deferred leasing costs	(18,642		)	(26,533		)
Prepaid expenses and other assets	16,775			14,745
Accounts payable and accrued expenses	(6,671		)	(4,107		)
Deferred revenue and other liabilities	(7,213		)	10,190
Net cash provided by operating activities	162,068			159,607
Cash Flows From Investing Activities
Decrease (increase) in restricted cash for investing activities	558			(672		)
Development costs	(450		)	(493		)
Additions to building and improvements	(120,401		)	(103,835		)
Net cash used in investing activities	(120,293		)	(105,000		)

The accompanying notes are an integral part of these financial statements

6

Empire State Realty OP, L.P.

Condensed Consolidated Statements of Cash Flows (continued)

(unaudited)

(amounts in thousands)

	Nine Months Ended September 30,
	2016			2015
Cash Flows From Financing Activities
Proceeds from mortgage notes payable	50,000			—
Repayment of mortgage notes payable	(29,220		)	(143,903		)
Proceeds from unsecured revolving credit facility	50,000			615,000
Repayments of unsecured revolving credit facility	(90,000		)	(595,000		)
Repayments of term loan and credit facility	—			(470,000		)
Proceeds from senior unsecured notes	—			350,000
Proceeds from unsecured term loan	—			265,000
Net proceeds from the sale of common units	611,278			—
Deferred financing costs	(2,905		)	(6,128		)
Distributions	(83,316		)	(68,920		)
Net cash provided by (used in) financing activities	505,837			(53,951		)
Net increase in cash and cash equivalents	547,612			656
Cash and cash equivalents—beginning of period	46,685			45,732
Cash and cash equivalents—end of period	$	594,297		$	46,388
Supplemental disclosures of cash flow information:
Cash paid for interest	$	53,286		$	49,305
Cash paid for income taxes	$	3,495		$	3,258
Non-cash investing and financing activities:
Building and improvements included in accounts payable and accrued expenses	$	71,444		$	47,029
Derivative instruments at fair values included in accounts payable and accrued expenses	31,227			4,384
Conversion of limited partners' operating partnership units to ESRT partner's capital	19,941			53,120

The accompanying notes are an integral part of these financial statements

7

Empire State Realty OP, L.P.

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," and the "company,” mean Empire State Realty OP, L.P. and its consolidated subsidiaries.

Empire State Realty OP, L.P. is the entity through which Empire State Realty Trust, Inc. (“ESRT”), a self-administered and self-managed real estate investment trust, or REIT, conducts all of its business and owns (either directly or through subsidiaries) substantially all of its assets. We own, manage, operate, acquire and reposition office and retail properties in Manhattan and the greater New York metropolitan area. As of September 30, 2016, 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 502,429 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, 2016, our portfolio included four standalone retail properties located in Manhattan and two standalone retail properties located in the city center of Westport, Connecticut, encompassing 204,452 rentable square feet in the aggregate.

We were organized as a Delaware limited partnership on November 28, 2011 and operations commenced upon completion of the initial public offering of ESRT’s Class A common stock and related formation transactions on October 7, 2013. ESRT, as the sole general partner in our company, has responsibility and discretion in the management and control in our company, and our limited partners, in such capacity, have no authority to transact business for, or participate in the management activities, of our company. As of September 30, 2016, ESRT owned approximately 51.8% of our operating partnership units.

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, 2015 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.

For purposes of comparison, certain items shown in the 2015 unaudited condensed consolidated financial statements have been reclassified to conform to the presentation used for 2016. For 2015 periods presented, certain Empire State Building public relations costs previously included in property operating expenses are included in observatory expenses. For the three and nine months ended September 30, 2016, these costs were $0.5 million and $1.8 million, respectively, and for the three and nine months ended September 30, 2015, these costs were $0.6 million and $1.7 million, respectively.

    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, 2015 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

8

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 as well as whether the entity is a variable interest entity (“VIE”) and we are 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. We had no VIEs as of September 30, 2016 and December 31, 2015.

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 reimbursement, estimate of percentage of completion on construction contracts, 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.

Recently Issued or Adopted Accounting Standards

During August 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("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

9

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. We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

During January 2016, the FASB issued ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Liabilities, which makes targeted improvements to existing generally accepted accounting principles by requiring, among others, i) equity investments (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income, and ii) public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, iii) separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (that is, securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements. ASU No. 2016-01 will take effect for public companies for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

During April 2015, the FASB issued ASU No. 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs, which amends the requirements for the presentation of debt issuance costs and requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. ASU No. 2015-03 is effective for fiscal years, beginning after December 15, 2015 and interim periods within those fiscal years. ASU No. 2015-03 was amended in August 2015 by ASU No. 2015-15, Interest - Imputation of Interest (Subtopic 835-30) - Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements, to add to the Codification SEC staff guidance that the SEC staff will not object to an entity presenting the costs of securing line-of-credit arrangements as an asset, regardless of whether there are any outstanding borrowings. The SEC Observer to the Emerging Issues Task Force announced the staff guidance in response to questions that arose after the FASB issued ASU No. 2015-03. We adopted ASU 2015-03 as of December 31, 2015.

During February 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810) - Amendments to the Consolidation Analysis, which amends the criteria for determining which entities are considered VIEs, amends the criteria for determining if a service provider possesses a variable interest in a VIE and ends the deferral granted to investment companies for application of the VIE consolidation model. ASU No. 2015-02 is effective for fiscal years, beginning after December 15, 2015 and interim periods within those fiscal years. The implementation of this update did not cause any material changes to 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 will be effective beginning in 2017 and 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. We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.    

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3. Deferred Costs, Acquired Lease Intangibles and Goodwill

Deferred costs, net consisted of the following as of September 30, 2016 and December 31, 2015 (amounts in thousands):

	September 30, 2016			December 31, 2015
Leasing costs	$	137,925		$	121,864
Acquired in-place lease value and deferred leasing costs	258,880			285,902
Acquired above-market leases	76,532			81,680
	473,337			489,446
Less: accumulated amortization	(190,773		)	(178,767		)
Total deferred costs, net, excluding net deferred financing costs	$	282,564		$	310,679

At September 30, 2016, $5.0 million 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 $6.1 million and $7.8 million for the three months ended September 30, 2016 and 2015, respectively, and $17.6 million and $19.2 million for the nine months endedSeptember 30, 2016 and 2015, respectively. Amortization expense related to acquired lease intangibles was $5.0 million and $9.8 million for the three months ended September 30, 2016 and 2015, respectively, and $19.7 million and $29.4 million for the nine months endedSeptember 30, 2016 and 2015, respectively.

Amortizing acquired intangible assets and liabilities consisted of the following as of September 30, 2016 and December 31, 2015 (amounts in thousands):

	September 30, 2016			December 31, 2015
Acquired below-market ground leases	$	396,916		$	396,916
Less: accumulated amortization	(18,898		)	(13,025		)
Acquired below-market ground leases, net	$	378,018		$	383,891

	September 30, 2016			December 31, 2015
Acquired below-market leases	$	(135,633	)	$	(163,290	)
Less: accumulated amortization	47,925			59,119
Acquired below-market leases, net	$	(87,708	)	$	(104,171	)

Rental revenue related to the amortization of below-market leases, net of above-market leases, was $1.2 million and $4.8 million for the three months ended September 30, 2016 and 2015, respectively, and $6.3 million and $14.7 million for the nine months endedSeptember 30, 2016 and 2015, respectively.

As of September 30, 2016, 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, 2016 and December 31, 2015 (amounts in thousands):

							As of September 30, 2016
	Principal Balance as of September 30, 2016			Principal Balance as of December 31, 2015			Stated Rate		Effective Rate(1)		Maturity Date(2)
Mortgage debt collateralized by:
Fixed rate mortgage debt
10 Bank Street	$	31,715		$	32,214		5.72	%	6.22	%	6/1/2017
1542 Third Avenue	17,906			18,222			5.90	%	6.61	%	6/1/2017
First Stamford Place	236,030			238,765			5.65	%	6.17	%	7/5/2017
1010 Third Avenue and 77 West 55th Street	26,646			27,064			5.69	%	6.39	%	7/5/2017
383 Main Avenue	28,811			29,269			5.59	%	6.04	%	7/5/2017
1333 Broadway	67,909			68,646			6.32	%	3.76	%	1/5/2018
1400 Broadway
(first lien mortgage loan)	67,974			68,732			6.12	%	3.41	%	2/5/2018
(second lien mortgage loan)	9,442			9,600			3.35	%	3.36	%	2/5/2018
112 West 34th Street
(first lien mortgage loan)	75,554			76,406			6.01	%	3.36	%	4/5/2018
(second lien mortgage loan)	9,543			9,640			6.56	%	3.67	%	4/5/2018
1350 Broadway	37,913			38,348			5.87	%	3.74	%	4/5/2018
Metro Center	96,483			97,950			3.59	%	3.66	%	11/5/2024
10 Union Square (3)	50,000			20,289			3.70	%	4.00	%	4/1/2026
Total mortgage debt	755,926			735,145
Senior unsecured notes - exchangeable	250,000			250,000			2.63	%	3.93	%	8/15/2019
Senior unsecured notes:
Series A	100,000			100,000			3.93	%	4.02	%	3/27/2025
Series B	125,000			125,000			4.09	%	4.18	%	3/27/2027
Series C	125,000			125,000			4.18	%	4.27	%	3/27/2030
Unsecured revolving credit facility	—			40,000			(4)		(4)		1/23/2019
Unsecured term loan facility	265,000			265,000			(5)		(5)		8/24/2022
Total principal	1,620,926			1,640,145
Unamortized premiums, net of unamortized discount	1,974			5,181
Deferred financing costs, net	(7,067		)	(12,910		)
Total	$	1,615,833		$	1,632,416

______________

(1) The effective rate is the yield as of September 30, 2016, 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) The mortgage loan collateralized by 10 Union Square was refinanced in March 2016.

(4) At September 30, 2016, the unsecured revolving credit facility bears a floating rate at 30 day LIBOR plus 1.15%. The rate at September 30, 2016 was 1.68%.

(5) The unsecured term loan facility bears a floating rate at 30 day LIBOR plus 1.60%. The rate at September 30, 2016 was 2.13%. 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.

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Principal Payments

Aggregate required principal payments at September 30, 2016 are as follows (amounts in thousands):

Year	Amortization		Maturities		Total
2016	$	3,086	$	—	$	3,086
2017	9,904		336,009		345,913
2018	2,880		262,210		265,090
2019	2,188		250,000		252,188
2020	2,268		—		2,268
Thereafter	9,706		742,675		752,381
Total	$	30,032	$	1,590,894	$	1,620,926

Deferred Financing Costs

Deferred financing costs, net, consisted of the following at September 30, 2016 and December 31, 2015 (amounts in thousands):

	September 30, 2016			December 31, 2015
Financing costs	$	23,044		$	20,882
Less: accumulated amortization	(10,949		)	(7,972		)
Total deferred financing costs, net	$	12,095		$	12,910

Amortization expense related to deferred financing costs was $1.3 million and $1.1 million for the three months ended September 30, 2016 and 2015, respectively, and $3.7 million and $5.0 million for the nine months endedSeptember 30, 2016 and 2015, respectively, and was included in interest expense. At September 30, 2016, $5.0 million of net deferred financing costs associated with the unsecured revolving credit facility was included in deferred costs, net on the condensed consolidated balance sheet.

Unsecured Revolving Credit Facility

On January 23, 2015, we entered into an unsecured revolving credit agreement, which is referred to herein as the “unsecured revolving credit facility,” with Bank of America, Merrill Lynch, Goldman Sachs and the other lenders party thereto. Merrill Lynch acted as joint lead arranger; Bank of America acted as administrative agent; and Goldman Sachs acted as syndication agent and joint lead arranger.

Concurrently with entering into the unsecured revolving credit facility, on January 23, 2015, we terminated our secured revolving and term credit facility and wrote off $1.3 million of deferred financing costs. In connection with the termination of the secured revolving and term credit facility, all of the guarantors thereunder were released from their guaranty obligations, all liens created thereby were terminated, and all collateral pledged thereunder was released.

The unsecured revolving credit facility is comprised of a revolving credit facility in the maximum original principal amount of $800.0 million. The unsecured revolving credit facility contains an accordion feature that would allow us to increase the maximum aggregate principal amount to $1.25 billion under specified circumstances. On July 6, 2016, we partially exercised the accordion feature and increased our committed borrowing capacity under the unsecured revolving credit facility from $800 million to $1.1 billion.

Amounts outstanding under the unsecured revolving credit facility bear interest at a floating rate equal to, at our election, (x) a Eurodollar rate, plus a spread that ranges from 0.875% to 1.600% depending upon our leverage ratio and credit rating; or (y) a base rate, plus a spread that ranges from 0.000% to 0.600% depending upon our leverage ratio and credit rating. In addition, the unsecured revolving credit facility permits us to borrow at competitive bid rates determined in accordance with procedures described in the unsecured revolving credit facility agreement. We paid certain customary fees and expense reimbursements to enter into the unsecured revolving credit facility.

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The initial maturity of the unsecured revolving credit facility is January 2019. 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 0.075% of the then outstanding commitments under the unsecured revolving credit facility.

The unsecured revolving credit facility includes the following financial covenants: (i) maximum leverage ratio of total indebtedness to total asset value 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 $745.4 million plus 75% of net equity proceeds received by us (other than proceeds received within ninety (90) days after the redemption, retirement or repurchase of ownership or equity interests in us up to the amount paid by us in connection with such redemption, retirement or repurchase, where, the net effect is that we shall not have increased our 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, (vi) the ratio of total unsecured indebtedness to unencumbered asset value will not exceed 60%, and (vii) consolidated secured recourse indebtedness will not exceed 10% of total asset value (provided, however, this covenant shall not apply at any time after we achieve debt ratings from at least two of Moody’s, S&P and Fitch, and such debt ratings are Baa3 or better (in the case of a rating by Moody’s) or BBB- or better (in the case of a rating by S&P or Fitch)).

The unsecured revolving credit facility contains customary covenants, including limitations on liens, investment, 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).

As of September 30, 2016, we were in compliance with the covenants under the unsecured revolving credit facility. 

Senior Unsecured Notes

Exchangeable Senior Notes

During August 2014, we issued $250.0 million principal amount of 2.625% Exchangeable Senior Notes (“2.625% Exchangeable Senior Notes”) due August 15, 2019. These 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 our intent and ability to settle the principal amount of the 2.625% Exchangeable Senior Notes is in cash. As of September 30, 2016, the exchange rate of the 2.625% Exchangeable Senior Notes was 51.5095 shares per $1,000 principal amount of notes (equivalent to an initial exchange price of approximately $19.41 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, 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. For the three and nine months endedSeptember 30, 2015, 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.

Series A, Series B, and Series C Senior Notes

During March 2015, we issued and sold an aggregate principal amount of $350 million senior unsecured notes consisting of $100 million of 3.93% Series A Senior Notes due 2025, $125 million of 4.09% Series B Senior Notes due 2027, and $125 million of 4.18% Series C Senior Notes due 2030 (together, the “Series A, B and C Senior Notes”). Interest on the Series A, B and C Senior Notes is payable quarterly.

The terms of the Series A, B and C Senior Notes agreement include customary covenants, including limitations on liens, investment, debt, fundamental changes, and transactions with affiliates and require certain customary financial reports. The Series A, B and C Senior Notes also require compliance with financial ratios consistent with our unsecured revolving

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credit facility including a maximum leverage ratio, a maximum secured leverage ratio, a minimum amount of tangible net worth, a minimum fixed charge coverage ratio, a minimum unencumbered interest coverage ratio, a maximum unsecured leverage ratio and a maximum amount of secured recourse indebtedness.

The proceeds from the issuance of the Series A, B and C Senior Notes were used to repay outstanding mortgage debt, reduce amounts outstanding under the unsecured revolving credit facility and for other general corporate purposes. As of September 30, 2016, we were in compliance with the covenants under the Series A, B and C Senior Notes. 

Senior Unsecured Term Loan Facility

During August 2015, we entered into a $265.0 million senior unsecured term loan facility, which is referred to herein as the “term loan facility” with Wells Fargo Bank, National Association, as administrative agent, Capital One, National Association, as syndication agent, PNC Bank, National Association, as documentation agent, and the lenders from time to time party thereto.

Amounts outstanding under the term loan facility bear interest at a floating rate equal to, at our election, (x) a LIBOR rate, plus a spread that ranges from 1.400% to 2.350% depending upon our leverage ratio and credit rating; or (y) a base rate, plus a spread that ranges from 0.400% to 1.350% depending upon our leverage ratio and credit rating. Pursuant to a forward interest rate swap agreement, we effectively fixed LIBOR at 2.1485% for $265.0 million of the term loan facility for the period beginning on August 31, 2017 through maturity. In connection with the closing of the term loan facility, we paid certain customary fees and expense reimbursements.

The term loan facility matures on August 24, 2022. We may prepay loans under the term loan facility at any time, subject to certain notice requirements. To the extent that we prepay all or any portion of a loan on or prior to August 24, 2017, we will pay a prepayment premium equal to (i) if such prepayment occurs on or prior to August 24, 2016, 2.00% of the principal amount so prepaid, and (ii) if such prepayment occurs after August 24, 2016 but on or prior to August 24, 2017, 1.00% of the principal amount so prepaid.

The terms of the term loan facility agreement include customary covenants, including limitations on liens, investment, debt, fundamental changes, and transactions with affiliates and require certain customary financial reports. The term loan facility requires compliance with financial ratios including a maximum leverage ratio, a maximum secured leverage ratio, a minimum amount of tangible net worth, a minimum fixed charge coverage ratio, a minimum unencumbered interest coverage ratio, a maximum unsecured leverage ratio and a maximum amount of secured recourse indebtedness. It also contains customary events of default (subject in certain cases to specified cure periods). These terms in the term loan facility agreement are consistent with the terms in our unsecured revolving credit facility agreement.

The proceeds from the term loan facility were used to repay borrowings made under the unsecured revolving credit facility. As of September 30, 2016, we were in compliance with the covenants under the term loan facility. 

5. Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses consist of the following as of September 30, 2016 and December 31, 2015 (amounts in thousands):

	September 30, 2016		December 31, 2015
Accounts payable and accrued expenses	$	99,522	$	83,352
Payable to the estate of Leona M. Helmsley (1)	18,367		18,367
Interest rate swap agreements liability	31,227		1,922
Accrued interest payable	4,426		5,555
Due to affiliated companies	1,031		1,903
Accounts payable and accrued expenses	$	154,573	$	111,099

___________

(1) Reflects a payable to the estate of Leona M. Helmsley in the amount of New York City transfer taxes which would have been payable in absence of the estate's exemption from such tax.

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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.

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, 2016, 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 $31.8 million. If we had breached any of these provisions at September 30, 2016, we could have been required to settle our obligations under the agreements at their termination value of $31.8 million.

As of September 30, 2016, we had three interest rate LIBOR swaps with an aggregate notional value of $465.0 million. The notional value does not represent exposure to credit, interest rate or market risks. The fair value of these derivative instruments, which is included in accounts payable and accrued expenses on the condensed consolidated balance sheet, amounted to $31.2 million at September 30, 2016. 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, 2016, these cash flow hedges are deemed effective and an unrealized gain of $0.9 million and an unrealized loss of $29.3 million are reflected in the condensed consolidated statements of comprehensive income for the three and nine months ended September 30, 2016, respectively. Amounts reported in accumulated other comprehensive income related to derivatives will be reclassified to interest expense as interest payments are made on the debt. We estimate that $1.2 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, 2016.

The table below summarizes the terms of agreements and the fair values of our derivative financial instruments as of September 30, 2016 and December 31, 2015 (dollar amounts in thousands):     

	As of September 30, 2016						September 30, 2016					December 31, 2015
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	$	—	$	(12,921	)	$	—	$	(1,620	)
Interest rate swap	100,000		3 Month LIBOR	2.5050%	July 5, 2017	July 5, 2027	—		(9,153		)	—		(148		)
Interest rate swap	100,000		3 Month LIBOR	2.5050%	July 5, 2017	July 5, 2027	—		(9,153		)	—		(154		)
							$	—	$	(31,227	)	$	—	$	(1,922	)

The table below shows the effect of our derivative financial instruments designated as cash flow hedges for the three and nine months endedSeptember 30, 2016 and 2015 (amounts in thousands):    

Effects of Cash Flow Hedges	Three Months Ended September 30, 2016		Three Months Ended September 30, 2015			Nine Months Ended September 30, 2016			Nine Months Ended September 30, 2015
Amount of gain (loss) recognized in other comprehensive income (loss) - effective portion	$	930	$	(4,384	)	$	(29,305	)	$	(4,384	)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense - effective portion	—		—			—			—
Amount of gain (loss) recognized in other income/expense - ineffective portion	—		—			—			—

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Fair Valuation

The estimated fair values at September 30, 2016 and December 31, 2015 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 is classified as Level 1 and was derived from quoted prices in active markets. However, the fair value could be classified as Level 2 if trading volumes are low.

The fair value of derivative instruments, which is classified as Level 2, and measured on a recurring basis, is determined using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. The fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments) and the discounted expected variable cash payments (or receipts). The variable cash payments (or receipts) are based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves.

The fair value of borrowings, which is classified as Level 3, is estimated by discounting the contractual cash flows of each debt to their present value using adjusted market interest rates, which is provided by a third-party specialist.

The following tables summarize the carrying and estimated fair values of our financial instruments as of September 30, 2016 and December 31, 2015 (amounts in thousands):

	September 30, 2016
			Estimated Fair Value
	Carrying Value		Total		Level 1		Level 2		Level 3
Interest rate swaps included in accounts payable and accrued expenses	$	31,227	$	31,227	$	—	$	31,227	$	—
Mortgage notes payable	763,457		770,827		—		—		770,827
Senior unsecured notes - Exchangeable	240,658		290,325		290,325		—		—
Senior unsecured notes - Series A, B, and C	348,888		364,574		—		—		364,574
Unsecured term loan facility	262,830		265,000		—		—		265,000
Unsecured revolving credit facility	—		—		—		—		—

	December 31, 2015
			Estimated Fair Value
	Carrying Value		Total		Level 1		Level 2		Level 3
Interest rate swaps included in accounts payable and accrued expenses	$	1,922	$	1,922	$	—	$	1,922	$	—
Mortgage notes payable	747,661		752,350		—		—		752,350
Senior unsecured notes - Exchangeable	238,208		251,391		—		—		251,391
Senior unsecured notes - Series A, B, and C	348,810		344,501		—		—		344,501
Unsecured term loan facility	262,545		265,000		—		—		265,000
Unsecured revolving credit facility	35,192		40,000		—		—		40,000

Disclosure about fair value of financial instruments is based on pertinent information available to us as of September 30, 2016 and December 31, 2015. Although we are not aware of any factors that would significantly affect the reasonableness of these 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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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, 2016, 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.

In March 2012, five putative class actions, or the "Original Class Actions," were filed in New York State Supreme Court, New York County by investors in certain of the existing entities (constituting the predecessor and the non-controlled entities) (the "Existing Entities") on March 1, 2012, March 7, 2012, March 12, 2012, March 14, 2012 and March 19, 2012. The plaintiffs asserted claims against our predecessor’s management companies, Anthony E. Malkin, Peter L. Malkin, the estate of Leona M. Helmsley, ESRT and us for breach of fiduciary duty, unjust enrichment and/or aiding and abetting breach of fiduciary duty. They alleged, among other things, that the terms of the consolidation and the process by which it was structured (including the valuation that was employed) are unfair to the investors in the Existing Entities, the consolidation provides excessive benefits to Malkin Holdings LLC (now our subsidiary) and its affiliates and the then-draft prospectus/consent solicitation with respect to the consolidation filed with the SEC failed to make adequate disclosure to permit a fully-informed decision about the consolidation. The complaints sought money damages and injunctive relief preventing the consolidation. The Original Class Actions were consolidated and co-lead plaintiffs’ counsel were appointed by the New York State Supreme Court by order dated June 26, 2012. Further, an underlying premise of the Original Class Actions, as noted in discussions among plaintiffs' counsel and defendants' counsel, was that the consolidation had been structured in such a manner that would cause investors in Empire State Building Associates L.L.C., 60 East 42nd St. Associates L.L.C. and 250 West 57th St. Associates L.L.C. (the “subject LLCs”) immediately to incur substantial tax liabilities.

The parties entered into a Stipulation of Settlement dated September 28, 2012, resolving the Original Class Actions. The Stipulation of Settlement recites that the consolidation was approved by overwhelming consent of the investors in the Existing Entities. The Stipulation of Settlement states that counsel for the plaintiff class satisfied themselves that they have received adequate access to relevant information, including the independent valuer's valuation process and methodology, that the disclosures in the Registration Statement on Form S-4, as amended, are appropriate, that the consolidation presents potential benefits, including the opportunity for liquidity and capital appreciation, that merit the investors' serious consideration and that each of the named class representatives intends to support the consolidation as modified. The Stipulation of Settlement further states that counsel for the plaintiff class are satisfied that the claims regarding tax implications, enhanced disclosures, appraisals and exchange values of the properties that would be consolidated into our company, and the interests of the investors in the Existing Entities, have been addressed adequately, and they have concluded that the settlement pursuant to the Stipulation of Settlement and opportunity to consider the proposed consolidation on the basis of revised consent solicitations are fair, reasonable, adequate and in the best interests of the plaintiff class.

The defendants in the Stipulation of Settlement denied that they committed any violation of law or breached any of their duties and did not admit that they had any liability to the plaintiffs.

The terms of the settlement include, among other things (i) a payment of $55.0 million, with a minimum of 80% in cash and maximum of 20% in freely-tradable shares of ESRT common stock and/or freely-tradable operating partnership units to be distributed, after reimbursement of plaintiffs' counsel's court-approved expenses and payment of plaintiffs' counsel's court-approved attorneys' fees (which are included within the $55.0 million settlement payment) and, in the case of shares of ESRT common stock and/or operating partnership units, after the termination of specified lock-up periods, to investors in the Existing Entities pursuant to a plan of allocation to be prepared by counsel for plaintiffs; (ii) defendants' agreement that (a) the Offering would be on the basis of a firm commitment underwriting; (b) if, during the solicitation period, any of the three subject LLCs' percentage of total exchange value is lower than what was stated in the final prospectus/consent solicitation with respect to the consolidation by 10% or more, such decrease would be promptly disclosed by defendants to investors in the subject LLCs; and (c) unless total gross proceeds of $600.0 million are raised in the Offering, defendants will not proceed with the consolidation without further approval of the subject LLCs; and (iii) defendants' agreement to make additional disclosures in the prospectus/consent solicitation with respect to the consolidation regarding certain matters (which are included therein). Investors in the Existing Entities will not be required to bear any portion of the settlement payment. The payment in settlement

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of the Original Class Actions will be made by the estate of Leona M. Helmsley and affiliates of Malkin Holdings LLC (provided that none of Malkin Holdings LLC's affiliates that would become our direct or indirect subsidiary in the consolidation will have any liability for such payment) and certain investors in the Existing Entities who agree to contribute. We will not bear any of the settlement payment.

The settlement further provides for the certification of a class of investors in the Existing Entities, other than defendants and other related persons and entities, and a release of any claims of the members of the class against the defendants and related persons and entities, as well as underwriters and other advisors. The release in the settlement excludes certain claims, including but not limited to, claims arising from or related to any supplement to the Registration Statement on Form S-4 that is declared effective to which the plaintiffs' counsel objects in writing, which objection will not be unreasonably made or delayed, so long as plaintiffs' counsel has had adequate opportunity to review such supplement. There was no such supplement that plaintiff's counsel objected to in writing. The settlement was subject to court approval. It was not effective until such court approval is final, including the resolution of any appeal. Defendants continue to deny any wrongdoing or liability in connection with the allegations in the Original Class Actions.

On January 18, 2013, the parties jointly moved for preliminary approval of the settlement, for permission to send notice of the settlement to the class, and for the scheduling of a final settlement hearing. On January 28, 2013, six of the investors in Empire State Building Associates L.L.C. filed an objection to preliminary approval, and cross-moved to intervene in the Original Class Actions and for permission to file a separate complaint on behalf of the investors in Empire State Building Associates L.L.C. On February 21, 2013, the court denied the cross motion of such objecting investors, and the court denied permission for such objecting investors to file a separate complaint as part of the Original Class Actions, but permitted them to file a brief solely to support their allegation that the buyout would deprive non-consenting investors in Empire State Building Associates L.L.C. of “fair value” in violation of the New York Limited Liability Company Law. The court rejected the objecting investors’ assertion that preliminary approval be denied and granted preliminary approval of the settlement.

Pursuant to a decision issued on April 30, 2013, the court rejected the allegation regarding the New York Limited Liability Company Law and ruled in Malkin Holdings LLC’s favor, holding that such buyout provisions are legally binding and enforceable and that investors do not have the rights they claimed under the New York Limited Liability Company Law.

On May 2, 2013, the court held a hearing regarding final approval of the Original Class Actions settlement, at the conclusion of which the court stated that it intended to approve the settlement. On May 17, 2013, the court issued its Opinion and Order. The court rejected the objections by all objectors and upheld the settlement in its entirety. Of the approximately 4,500 class members who are investors in all of the Existing Entities included in the consolidation, 12 opted out of the settlement. Those who opted out will not receive any share of the settlement proceeds, but can pursue separate claims for monetary damages.

Also on May 17, 2013, the court issued its Opinion and Order on attorneys’ fees. Class counsel applied for an award of $15.0 million in fees and $295,895 in expenses, which the court reduced to $11.59 million in fees and $265,282 in expenses (which are included within the $55.0 million settlement payment).

The investors who challenged the buyout provision filed a notice of appeal of the court’s April 30, 2013 decision and moved before the appellate court for a stay of all proceedings relating to the settlement, including such a stay as immediate interim relief. On May 1, 2013, their request for immediate interim relief was denied. On May 13, 2013, Malkin Holdings LLC filed its brief in opposition to the motion for the stay. On June 18, 2013, the appellate court denied the motion for the stay. On July 16, 2013, these investors filed their brief and other supporting papers on their appeal of the April 30, 2013 decision, which are required to perfect the appeal. On September 4, 2013, Malkin Holdings LLC filed its brief on the appeal, and also moved to dismiss the appeal on the grounds that these investors lack standing to pursue it. Malkin Holdings LLC contended that these investors were not entitled to appraisal under the New York Limited Liability Company Law because, among other reasons (i) they are not members of Empire State Building Associates L.L.C., and only members have such rights; (ii) the transaction in question is not a merger or consolidation as defined by statute, and appraisal only applies in those transactions; and (iii) when Empire State Building Associates L.L.C. was converted into a limited liability company, the parties agreed that no appraisal would apply. Moreover, Malkin Holdings LLC contended that only the 12 investors who opted out of the class action settlement could pursue appraisal, because that settlement contains a broad release of (and there is an associated bar order from the court preventing) any such claims. Malkin Holdings LLC further noted that of the six investors attempting to pursue the appeal, only two had in fact opted out of the class action settlement. On September 13, 2013, these investors filed their reply brief on the appeal, and opposed the motion to dismiss. On September 19, 2013, Malkin Holdings LLC filed its reply brief on the motion to dismiss. On October 3, 2013, the appeals court denied the motion to dismiss without prejudice to address the matter directly on the appeal, effectively referring the issues raised in the motion to the panel that was to hear the appeal itself. The appeals court heard argument on November 21, 2013, and in a Decision and Order dated February 25, 2014, it affirmed the trial court’s ruling.

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In addition, on June 20, 2013, these same investors, and one additional investor who also opposed the settlement of the Original Class Action, filed additional notices of appeal from the trial court’s rulings in the Original Class Actions. These notices of appeal related to (i) the order entered February 22, 2013 granting preliminary approval of the Original Class Action settlement and setting a hearing for final approval; (ii) the order entered February 26, 2013, refusing to sign a proposed order to show cause for a preliminary injunction regarding the consolidation; (iii) an order entered April 2, 2013, denying the motion to intervene and to file a separate class action on behalf of Empire State Building Associates L.L.C. investors; (iv) the order entered April 10, 2013, refusing to sign the order to show cause seeking to extend the deadline for class members to opt out of the Original Class Action settlement; (v) the Final Judgment and Order entered May 17, 2013; (vi) the order entered May 17, 2013 approving the Original Class Action settlement; and (vii) the order entered May 17, 2013 awarding class counsel attorneys’ fees and costs. On January 6, 2014, Class counsel moved to dismiss these additional appeals on the grounds that they were not timely perfected by filing an appellate brief and record. On February 6, 2014, the appeals court granted the motion unless the appeals were perfected by March 17, 2014.

On March 27, 2014, the investors who challenged the buyout provision moved in the appellate court for re-argument or in the alternative for leave to appeal the appeals court’s ruling to the New York Court of Appeals. Opposition to the motion was filed on April 7, 2014. The appellate court denied the motion on May 22, 2014. The investors moved in the New York Court of Appeals for leave to appeal on June 26, 2014. Opposition to this motion was filed on July 11, 2014 and the court dismissed the motion by order dated September 18, 2014. On October 20, 2014, the investors moved to re-argue that dismissal. That motion was denied on December 17, 2014, and counsel for these investors has represented that the investors do not intend to pursue further appellate review of the court’s April 30, 2013 ruling rejecting the challenge to the buyout provision. On March 3, 2015, plaintiffs' counsel filed a motion with the court for its approval of distribution of the net settlement fund. In that motion plaintiffs' counsel also asked for additional fees and expenses to be paid out of the fund. On March 20, 2015, Malkin Holdings LLC filed a response to that motion in which it supported distribution of the fund and took no position on additional fees and expenses. No opposition to the motion was filed and the court granted the motion. Substantially all of the net settlement fund has been distributed to the class, but a small amount remains outstanding.

On March 14, 2014, one of the investors who had filed a notice of appeal from the trial court’s rulings in the Original Class Actions noted above perfected an appeal from the court’s May 17, 2013 Final Judgment and Order and orders approving the Original Class Action Settlement and awarding class counsel attorneys’ fees and costs. By stipulation of all counsel to the appeal dated September 12, 2014, the appeal was dismissed with prejudice. No other appeals were filed by the March 17, 2014 deadline set by the appeals court in its February 6, 2014 order. The Original Class Actions Settlement is final and non-appealable.

In addition, commencing December 24, 2013, four putative class actions, or the "Second Class Actions," were filed in New York State Supreme Court, New York County, against Malkin Holdings LLC, Peter L. Malkin, Anthony E. Malkin and Thomas N. Keltner, Jr. on behalf of former investors in Empire State Building Associates L.L.C. Generally, the Second Class Actions alleged that the defendants breached their fiduciary duties and were unjustly enriched. One of the Second Class Actions named us and ESRT as defendants, alleging that they aided and abetted the breaches of fiduciary duty. The Second Class Actions were consolidated on consent, and co-lead class counsel was appointed by order dated February 11, 2014. A Consolidated Amended Complaint was filed February 7, 2014, which did not name us or ESRT as defendants. It seeks monetary damages. On March 7, 2014, defendants filed a motion to dismiss the Second Class Actions, which the plaintiffs opposed and was fully submitted to the court on April 28, 2014. The court heard oral arguments on the motion on July 7, 2014, and the motion to dismiss was granted in a ruling entered July 21, 2014. The plaintiffs filed a notice of appeal on August 8, 2014. On January 12, 2015, the plaintiffs filed a motion to supplement the record on appeal to include additional materials from the Original Class Action, which the defendants opposed. The motion was denied on March 5, 2015. The plaintiffs perfected this appeal by filing their brief and the appellate record with the court on March 23, 2015. Oral argument on the appeal was held on October 28, 2015. On November 25, 2015, the appellate court affirmed dismissal of the Second Class Actions. The plaintiffs moved the appellate court for leave to appeal to the New York Court of Appeals. On March 1, 2016, the appellate court denied the motion. On March 31, 2016, the plaintiffs moved for leave to appeal in the New York Court of Appeals, which the Court of Appeals denied on June 9, 2016. The time for any further appeal of this dismissal has now expired.

On or about October 14, 2014, the 12 investors (out of approximately 4,500 investors covered by the Original Class Actions) who opted out of the Original Class Actions filed an arbitration with the American Arbitration Association against Peter L. Malkin, Anthony E. Malkin, Thomas N. Keltner, Jr., and Malkin Holdings LLC, as respondents, alleging breach of fiduciary duty and related claims in connection with the consolidation. The statement of claim in that 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 plan to move to stay the lawsuit in favor of the pending arbitration. On February 2, 2015, the claimants filed an amended complaint

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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 May 24, 2016 and proceeded for several days. The hearings are scheduled to resume December 19, 2016.

As with the prior claims challenging the consolidation and related matters, the defendants believe the allegations in the arbitration are entirely without merit, and they intend to defend 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 Second Class Actions and the above-referenced arbitration.

Additionally, there is a risk that other third parties will assert claims against us, Malkin Holdings LLC, or any other party entitled to defense and indemnity from us, including, without limitation, claims that Malkin Holdings LLC breached its fiduciary duties to investors in the Existing Entities or that the consolidation violates the relevant operating agreements, and third parties may commence litigation related to such claims. As a result, we may incur costs associated with defending or settling such litigation or paying any judgment if we lose.

Unfunded Capital Expenditures

At September 30, 2016, we estimate that we will incur approximately $57.1 million of capital expenditures for tenant improvements and leasing commissions on our consolidated properties pursuant to existing lease agreements. We expect to fund these capital expenditures with operating cash flow, additional property level mortgage financings, our unsecured revolving credit facility, other issuances of debt, and cash on hand. 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, 2016 are as follows (amounts in thousands):

2016	$	380
2017	1,518
2018	1,518
2019	1,518
2020	1,518
Thereafter	56,730
	$	63,182

Concentration of Credit Risk

Financial instruments that subject us to credit risk consist primarily of cash, restricted cash, tenant and other receivables and deferred rent receivables. At September 30, 2016, 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, 2016, 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.

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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, 2016, our 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. Capital

On August 23, 2016, an affiliate of Qatar Investment Authority (“QIA”) purchased 29,610,854 newly issued ESRT Class A common shares at $21.00 per share, resulting in gross proceeds of $621.8 million. The proceeds were contributed to us and we issued 29,610,854 Series PR units to ESRT. At August 23, 2016, the 29,610,854 units were equivalent to a 9.9% economic interest in us. QIA has a top-up right to maintain their ownership stake at 9.9% over time.

In connection with the share issuance to QIA, ESRT 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 ESRT pays that are attributable to capital gains from the sale or exchange of any U.S. real property interests. If ESRT were to trigger its tax indemnification obligations under this agreement, we and ESRT would be required to pay QIA for the resulting tax consequences, as applicable.

As of September 30, 2016, there were 299,099,533 operating partnership units outstanding, of which 154,925,644, or 51.8%, were owned by ESRT and 144,173,889, or 48.2%, were owned by other partners, including ESRT directors, members of senior management and other employees.

Long-term incentive plan ("LTIP") units are a special class of partnership interests. Each LTIP unit awarded will be deemed equivalent to an award of one share of ESRT 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, we 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 unitholders. Subject to any agreed upon exceptions, once vested and having achieved parity with unitholders, LTIP units are convertible into Series PR operating partnership units on a one-for-one basis.     

With the exception of performance based LTIP units granted in 2016, all LTIP units issued in connection with annual

equity awards, whether vested or not, receive the same per unit distributions as operating partnership units, which equal

per share dividends (both regular and special) on our common stock. Performance based LTIP units granted in 2016 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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Distributions

Total distributions paid to OP unitholders were $31.4 million and $82.6 million for the three and nine months ended September 30, 2016, respectively, and $22.7 million and $68.2 million for the three and nine months ended September 30, 2015, respectively. Total distributions paid to preferred unitholders were $0.2 million and $0.7 million for the three and nine months ended September 30, 2016, respectively, and $0.2 million and $0.7 million for the three and nine months ended September 30, 2015, 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 ESRT common stock is authorized for issuance under awards granted pursuant to the 2013 Plan, and as of September 30, 2016, 8.3 million shares of ESRT common stock remain available for future issuance.

In January 2015, we made a grant of LTIP units to an employee under the 2013 Plan. We granted a total of 9,531 LTIP units with a fair market value of $0.2 million. The award is subject to time-based vesting and all LTIP units vest on April 1, 2020, subject generally to the grantee's continued employment.

In February 2015, we made grants of LTIP units to executive officers under the 2013 Plan. At such time, we granted a total of 168,033 LTIP units that are subject to time-based vesting and 154,266 LTIP units that are subject to performance-based vesting, with fair market values of $2.9 million for the time-based vesting awards and $1.3 million for the performance-based vesting awards. The awards subject to time-based vesting vest ratably over four years from January 1, 2015, subject generally to the grantee's continued employment. The first installment vests on the first-year anniversary date of January 1, 2015 and the remainder will vest thereafter in three equal annual installments. The vesting of the awards 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, 2015. 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, 2018 and the second installment vesting on January 1, 2019, subject generally to the grantee's continued employment on those dates.

In February 2015, we made grants of LTIP units and ESRT restricted stock to certain other employees under the 2013 Plan. At such time, we granted a total of 33,398 LTIP units and 14,315 shares of ESRT restricted stock that are subject to time-based vesting and 33,398 LTIP units and 14,315 shares of ESRT restricted stock that are subject to performance-based vesting, with fair market values of $0.8 million for the time-based vesting awards and $0.4 million for the performance-based vesting awards. The awards subject to time-based vesting vest ratably over four years from January 1, 2015, subject generally to the grantee's continued employment. The first installment vests on the first-year anniversary date of January 1, 2015 and the remainder will vest thereafter in three equal annual installments. The vesting of the awards 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, 2015. Following the completion of the three -year performance period, our compensation committee will determine the number of LTIP units or ESRT shares to which the grantee is entitled based on our performance relative to the performance hurdles set forth in the award agreements the grantee entered into in connection with the award grant. These units and ESRT shares then vest in two installments, with the first installment vesting on January 1, 2018 and the second installment vesting on January 1, 2019, subject generally to the grantee's continued employment on those dates. We issued operating partnership units to ESRT for each share of restricted stock issued by ESRT.

In February 2015, we made a grant of LTIP units to an executive officer under the 2013 Plan. At such time, we granted a total of 13,736 LTIP units that are subject to time-based vesting and 13,736 LTIP units that are subject to performance-based vesting, with fair market values of $0.2 million for the time-based vesting awards and $0.1 million for the performance-based vesting awards. The awards subject to time-based vesting vest ratably over four years from the date of the grant, subject generally to the grantee's continued employment. The first installment vests on the first-year anniversary date of the grant 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 February 1, 2015. 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 February 1, 2018 and the second installment vesting on February 1, 2019, subject generally to the grantee's continued employment on those dates.

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In June 2015, we made grants of LTIP units to our non-employee directors under the 2013 Plan. At such time, we granted a total of 35,082 LTIP units that are subject to time-based vesting, with fair market values of $0.6 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 2015 with fair market values of less than $0.1 million in the aggregate.

In February 2016, we made grants of LTIP units to executive officers under the 2013 Plan. At such time, we granted 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. 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 vests 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 February 2016, we made grants of LTIP units and restricted stock to certain other employees under the 2013 Plan. At such time, we granted 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 vests on January 1, 2017 and the remainder will vest thereafter in three equal annual installments. The vesting of the awards 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 award agreements the grantee entered into in connection with the award grant. These units and shares 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 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 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 units and restricted stock grants that are time-vesting, we estimate the stock compensation expense based on the fair value of the stock at the grant date.

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Share-based compensation expense has been adjusted by an amount of estimated forfeitures. Forfeitures are estimated based on historical experience at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. Based on an analysis of historical data, we have calculated a 0% annual forfeiture rate for members of the Board of Directors, a 0% annual forfeiture rate for executive officers, and for all other employees a 5% annual forfeiture rate. We reevaluate this analysis periodically and adjust these estimated forfeiture rates as necessary. To the extent actual results or updated estimates differ from our current estimates, such amounts will be recorded as a cumulative adjustment in the period estimates are revised.

LTIP units and ESRT restricted stock issued during the nine months endedSeptember 30, 2016 were valued at $18.4 million. The weighted-average per unit or share fair value was $9.60 for grants issued in 2016. 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 2016.

The following is a summary of ESRT restricted stock and LTIP unit activity for the nine months endedSeptember 30, 2016:

	Restricted Stock		LTIP Units		Weighted Average Grant Fair Value
Unvested balance at December 31, 2015	97,592		1,415,895		$	11.04
Vested	(4,350	)	(124,843	)	15.89
Granted	47,071		1,868,629		9.58
Forfeited	(278	)	—		17.97
Unvested balance at September 30, 2016	140,035		3,159,681		$	10.00

The LTIP unit and ESRT 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 $0.1 million and $0.6 million for the three and nine months endedSeptember 30, 2016, respectively, and $0.0 million and $0.5 million for the three and nine months ended September 30, 2015, respectively. Unrecognized compensation expense was $0.5 million at September 30, 2016, which will be recognized over a period of 2.2 years.

For the remainder of the LTIP unit and ESRT restricted stock awards, we recognize noncash compensation expense ratably over the vesting period, and accordingly, we recognized noncash compensation expense of $2.5 million and $6.7 million for the three and nine months endedSeptember 30, 2016, respectively and $1.4 million and $3.8 million for the three and nine months ended September 30, 2015, respectively. Unrecognized compensation expense was $21.0 million at September 30, 2016, which will be recognized over a weighted average period of 2.6 years.

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Earnings Per Unit

Earnings per unit for the three and nine months ended September 30, 2016 and 2015 is computed as follows (amounts in thousands, except per unit amounts):

	Three Months Ended,						Nine Months Ended,
	September 30, 2016			September 30, 2015			September 30, 2016			September 30, 2015
Numerator:
Net income	$	32,897		$	26,085		$	74,242		$	60,558
Private perpetual preferred unit distributions	(234		)	(234		)	(702		)	(702		)
Earnings allocated to unvested units	(225		)	(161		)	(575		)	(425		)
Net income attributable to common unitholders - basic and diluted	$	32,438		$	25,690		$	72,965		$	59,431
Denominator:
Weighted average units outstanding - basic	278,739			265,873			270,388			265,868
Effect of dilutive securities:
Stock-based compensation plans	1,090			—			378			—
Exchangeable senior notes	785			—			262			—
Weighted average units outstanding - diluted	280,614			265,873			271,028			265,868
Earnings per unit - basic and diluted	$	0.12		$	0.10		$	0.27		$	0.22

There were 1,033,044 and 757,119 antidilutive units for the three and nine months ended September 30, 2016, respectively, and 802,462 and 692,209 antidilutive units for three and nine months ended September 30, 2015, respectively.

10. Related Party Transactions

Supervisory Fee Revenue

We earned supervisory fees from affiliated entities not included in our condensed consolidated financial statements of $0.3 million and $0.5 million for the three months ended September 30, 2016 and 2015, respectively, and $1.1 million and $1.4 million for the nine months endedSeptember 30, 2016 and 2015, respectively. These fees are included within third-party management and other fees.

Property Management Fee Revenue

We earned property management fees from affiliated entities not included in our condensed consolidated financial statements of $0.1 million and $0.1 million for the three months ended September 30, 2016 and 2015, respectively, and $0.3 million and $0.2 million for the nine months endedSeptember 30, 2016 and 2015, respectively. These fees are included within third-party management and other fees.

Other

We are 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 receive 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 $0.06 million for the three months ended September 30, 2016 and 2015, respectively, and $0.2 million and $0.2 million for the nine months endedSeptember 30, 2016 and 2015, respectively. During August 2016, the previously shared office and leased spaces relocated to a new 5,351 square foot leased space at one of our properties, paying rent generally at a market rental rate. The affiliate has the right to cancel such lease without special payment on 90 days’ notice.

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

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 transfers as if the sales or transfers were to third parties, that is, at current market prices. We include our historical construction operation in "Other," and it includes all activities related to providing construction services to tenants and to other entities within and outside our company. As of March 27, 2015, we no longer solicited new business for our construction management business. We completed all projects that were in progress.

The following tables provide components of segment profit for each segment for the three and nine months endedSeptember 30, 2016 and 2015 (amounts in thousands):

	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
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
Interest expense	(17,939		)	—			—			(17,939		)
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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	Three Months Ended September 30, 2015
	Real Estate			Observatory			Other		Intersegment Elimination			Total
Revenues:
Rental revenue	$	110,903		$	—		$	—	$	—		$	110,903
Intercompany rental revenue	20,828			—			—		(20,828		)	—
Tenant expense reimbursement	23,096			—			—		—			23,096
Observatory revenue	—			35,702			—		—			35,702
Third-party management and other fees	618			—			—		—			618
Other revenue and fees	5,460			—			—		—			5,460
Total revenues	160,905			35,702			—		(20,828		)	175,779
Operating expenses:
Property operating expenses	41,052			—			—		—			41,052
Intercompany rent expense	—			20,828			—		(20,828		)	—
Ground rent expense	2,331			—			—		—			2,331
General and administrative expenses	10,182			—			—		—			10,182
Observatory expenses	—			7,896			—		—			7,896
Real estate taxes	23,613			—			—		—			23,613
Acquisition expenses	193			—			—		—			193
Depreciation and amortization	45,072			97			—		—			45,169
Total operating expenses	122,443			28,821			—		(20,828		)	130,436
Total operating income	38,462			6,881			—		—			45,343
Interest expense	(16,680		)	—			—		—			(16,680		)
Income before income taxes	21,782			6,881			—		—			28,663
Income tax expense	(474		)	(2,104		)	—		—			(2,578		)
Net income	$	21,308		$	4,777		$	—	$	—		$	26,085
Segment assets	$	3,070,234		$	235,937		$	2,596	$	—		$	3,308,767
Expenditures for segment assets	$	39,915		$	187		$	—	$	—		$	40,102

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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
Interest expense	(53,310		)	—			—			(53,310		)
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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	Nine Months Ended September 30, 2015
	Real Estate			Observatory			Other			Intersegment Elimination			Total
Revenues:
Rental revenue	$	333,827		$	—		$	—		$	—		$	333,827
Intercompany rental revenue	51,402			—			—			(51,402		)	—
Tenant expense reimbursement	59,878			—			—			—			59,878
Observatory revenue	—			84,525			—			—			84,525
Construction revenue	—			—			5,696			(3,715		)	1,981
Third-party management and other fees	1,658			—			—			—			1,658
Other revenue and fees	10,565			—			—			—			10,565
Total revenues	457,330			84,525			5,696			(55,117		)	492,434
Operating expenses:
Property operating expenses	120,341			—			—			—			120,341
Intercompany rent expense	—			51,402			—			(51,402		)	—
Ground rent expense	6,994			—			—			—			6,994
General and administrative expenses	28,395			—			—			—			28,395
Observatory expenses	—			23,391			—			—			23,391
Construction expenses	—			—			6,539			(3,317		)	3,222
Real estate taxes	69,543			—			—			—			69,543
Acquisition expenses	193			—			—			—			193
Depreciation and amortization	125,847			268			101			—			126,216
Total operating expenses	351,313			75,061			6,640			(54,719		)	378,295
Total operating income (loss)	106,017			9,464			(944		)	(398		)	114,139
Interest expense	(50,298		)	—			—			—			(50,298		)
Income (loss) before income taxes	55,719			9,464			(944		)	(398		)	63,841
Income tax benefit (expense)	(1,247		)	(2,376		)	340			—			(3,283		)
Net income (loss)	$	54,472		$	7,088		$	(604	)	$	(398	)	$	60,558
Expenditures for segment assets	$	109,104		$	211		$	—		$	—		$	109,315

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.

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”). For these statements, we claim the protections of the safe harbor for forward-looking statements contained in such Section. 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 the arbitration involving the company;

• reduced demand for office or retail space;

• general volatility of the capital and credit markets and the market price of ESRT's Class A common stock and our publicly-traded operating partnership 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 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), including the cost of construction delays and cost overruns;

• failure to operate properties successfully;

• inability to manage our growth effectively;

• inability to make distributions to our stockholders 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;

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• unavailability of, and inability to attract and retain, qualified personnel;

• conflicts of interest affecting any of our senior management team;

• misunderstanding of our competition;

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

• 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;

• inability to comply with the laws, rules and regulations applicable to companies and, in particular, public companies; and

• other factors discussed under “Item 1A, Risk Factors” of our Annual Report on Form 10-K for the year ended December 31, 2015 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, or 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. 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, 2015 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

Empire State Realty OP, L.P. is the entity through which Empire State Realty Trust, Inc. (“ESRT”), a self-administered and self-managed real estate investment trust, or REIT, conducts all of its business and owns (either directly or through subsidiaries) substantially all of its assets. We own, manage, operate, acquire and reposition office and retail properties in Manhattan and the greater New York metropolitan area.

Highlights for the three months ended September 30, 2016 included:

• Achieved net income attributable to the Company of $16.0 million and Core Funds From Operations of $71.9 million.

• Occupancy and leased percentages at September 30, 2016:

• Total portfolio was 87.9% occupied; including signed leases not commenced (“SLNC”), the total portfolio was 90.3% leased.

• Manhattan office portfolio (excluding the retail component of these properties) was 86.6% occupied; including SLNC, the Manhattan office portfolio was 89.5% leased.

• Retail portfolio was 86.3% occupied; including SLNC, the retail portfolio was 88.3% leased.

• Empire State Building was 90.1% occupied; including SLNC, the Empire State Building was 91.5% leased.

• Executed 51 leases, representing 348,770 rentable square feet across the total portfolio, achieving a 30.2% increase in mark-to-market rent over previous fully escalated rents on new, renewal, and expansion leases.

• Signed 20 new leases representing 224,125 rentable square feet in the third quarter 2016 for the Manhattan office portfolio (excluding the retail component of these properties), achieving an increase of 59.3% in mark-to-market rent over previous fully escalated rents.

• The Empire State Building Observatory revenue for the third quarter 2016 grew 6.7% to $38.1 million from $35.7 million in the third quarter 2015.

• On August 23, 2016, ESRT issued 29,610,854 ESRT Class A common shares at $21.00 per share in a private placement transaction with QIA which raised approximately $622 million in gross proceeds, which was contributed to us.

• Declared a dividend in the amount of $0.105 per unit for the third quarter 2016.

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As of September 30, 2016, 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 502,429 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, 2016, our portfolio included four standalone retail properties located in Manhattan and two standalone retail properties located in the city center of Westport, Connecticut, encompassing 204,452 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,
	2016				2015
Office leases	$	89,026	38.9	%	$	80,052	37.1	%
Retail leases	7,223		3.2	%	7,826		3.6	%
Tenant reimbursements & other income	18,530		8.1	%	20,675		9.6	%
Observatory operations	91,112		39.8	%	84,525		39.2	%
Broadcasting licenses and leases	22,771		10.0	%	22,784		10.5	%
Total	$	228,662	100.0	%	$	215,862	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, 2016, we have invested a total of approximately $698.0 million (excluding tenant improvement costs and leasing commissions) in our Manhattan office properties pursuant to this program. We are in the process of substantially completing the redevelopment and repositioning program as originally contemplated. We intend to fund these capital improvements through a combination of operating cash flow and borrowings.

As of September 30, 2016, excluding principal amortization, we had no debt maturing in 2016 and approximately $336.0 million of debt maturing in 2017, and we had total debt outstanding of approximately $1.6 billion, with a weighted average interest rate of 4.15% (excluding premiums and discount) and a weighted average maturity of 4.9 years. As of September 30, 2016, we had cash and cash equivalents of $594.3 million. Our consolidated net debt to total market capitalization was approximately 14.0% as of September 30, 2016.

As of March 2015, we no longer solicited new business for our construction management business. We have since completed all projects that were in progress and closed that business.

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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, 2016 and 2015, respectively.

Three Months Ended September 30, 2016 Compared to the Three Months Ended September 30, 2015

The following table summarizes our historical results of operations for the three months ended September 30, 2016 and 2015 (dollars in thousands):

	Three Months Ended September 30,
	2016			2015			Change			%
Revenues:
Rental revenue	$	115,634		$	110,903		$	4,731		4.3	%
Tenant expense reimbursement	19,176			23,096			(3,920		)	(17.0	)%
Observatory revenue	38,093			35,702			2,391			6.7	%
Third-party management and other fees	404			618			(214		)	(34.6	)%
Other revenues and fees	2,541			5,460			(2,919		)	(53.5	)%
Total revenues	175,848			175,779			69			—	%
Operating expenses:
Property operating expenses	38,585			41,052			(2,467		)	(6.0	)%
Ground rent expenses	2,331			2,331			—			—	%
General and administrative expenses	11,798			10,182			1,616			15.9	%
Observatory expenses	7,250			7,896			(646		)	(8.2	)%
Real estate taxes	24,691			23,613			1,078			4.6	%
Acquisition expenses	—			193			(193		)	100.0	%
Depreciation and amortization	37,607			45,169			(7,562		)	(16.7	)%
Total operating expenses	122,262			130,436			(8,174		)	(6.3	)%
Operating income	53,586			45,343			8,243			18.2	%
Interest expense	(17,939		)	(16,680		)	(1,259		)	7.5	%
Income before income taxes	35,647			28,663			6,984			24.4	%
Income tax expense	(2,750		)	(2,578		)	(172		)	6.7	%
Net income	32,897			26,085			6,812			26.1	%
Private perpetual preferred unit distributions	(234		)	(234		)	—			—
Net income attributable to common unitholders	$	32,663		$	25,851		$	6,812		26.4	%

Rental Revenue

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

Tenant Expense Reimbursement

The decrease in tenant expense reimbursements was due to a decrease in property operating expenses, including lower repairs and maintenance costs and lower utility costs in the three months ended September 30, 2016.

Observatory Revenue

Observatory revenues were higher primarily due to increased tourist visits and an improvement in our ticket mix versus the prior year period.

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Third-Party Management and Other Fees

The decrease reflects lower management fee income in the three months ended September 30, 2016 compared to the third quarter 2016.

Other Revenues and Fees

The decrease in other revenues and fees was primarily due to a $2.5 million acquisition break-up fee received in the third quarter 2015.

Property Operating Expenses

The decrease in property operating expenses was primarily due to lower repairs and maintenance costs and lower utility costs in the third quarter 2016.

General and Administrative Expenses

The increase in general and administrative expenses is due to $0.8 million related to higher 2016 incentive compensation bonus accruals and salaries and $1.2 million related to equity compensation expense.  We went public in October 2013 and we are still ramping up, adding layers of amortization of non-cash compensation expense associated with equity incentive compensation.  Once we conclude four years as a public company, the equity incentive compensation expense should stabilize.

Observatory Expenses

The decrease in Observatory expenses primarily reflects lower personnel costs associated with a tenant and onsite ticket reseller whose contract expired in the third quarter 2016. Additionally, the audio tour department was discontinued resulting in lower observatory expenses in the third quarter 2016.

Real Estate Taxes

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

Depreciation and Amortization

The decrease in depreciation and amortization was primarily attributable to assets that became fully depreciated during 2015.

Interest Expense

Interest expense increased due to higher interest rates and higher commitment fees due to higher borrowing capacity on the unsecured revolving credit facility in the third quarter 2016 compared to the prior year period.

Income taxes

The increase in income tax expense was attributable to activities within our taxable REIT subsidiaries, primarily due to higher Observatory taxable income for the three months ended September 30, 2016.

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Nine Months Ended September 30, 2016 Compared to the Nine Months Ended September 30, 2015

The following table summarizes our historical results of operations for the nine months ended September 30, 2016 and 2015 (dollars in thousands):

	Nine months ended September 30,
	2016			2015			Change			%
Revenues:
Rental revenue	$	343,155		$	333,827		$	9,328		2.8	%
Tenant expense reimbursement	56,350			59,878			(3,528		)	(5.9	)%
Observatory revenue	91,112			84,525			6,587			7.8	%
Construction revenue	—			1,981			(1,981		)	(100.0	)%
Third-party management and other fees	1,372			1,658			(286		)	(17.2	)%
Other revenues and fees	6,748			10,565			(3,817		)	(36.1	)%
Total revenues	498,737			492,434			6,303			1.3	%
Operating expenses:
Property operating expenses	115,075			120,341			(5,266		)	(4.4	)%
Ground rent expenses	6,994			6,994			—			—	%
General and administrative expenses	35,623			28,395			7,228			25.5	%
Observatory expenses	21,900			23,391			(1,491		)	(6.4	)%
Construction expenses	—			3,222			(3,222		)	(100.0	)%
Real estate taxes	71,773			69,543			2,230			3.2	%
Acquisition expenses	98			193			(95		)	(49.2	)%
Depreciation and amortization	115,382			126,216			(10,834		)	(8.6	)%
Total operating expenses	366,845			378,295			(11,450		)	(3.0	)%
Operating income	131,892			114,139			17,753			15.6	%
Interest expense	(53,310		)	(50,298		)	(3,012		)	6.0	%
Income before income taxes	78,582			63,841			14,741			23.1	%
Income tax expense	(4,340		)	(3,283		)	(1,057		)	32.2	%
Net income	74,242			60,558			13,684			22.6	%
Private perpetual preferred unit distributions	(702		)	(702		)	—			—	%
Net income attributable to common unitholders	$	73,540		$	59,856		$	13,684		22.9	%

Rental Revenue

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

Tenant Expense Reimbursement

The decrease in tenant expense reimbursements was due to a decrease in property operating expenses in the nine months ended September 30, 2016.

Observatory Revenue

Observatory revenues were higher in part due to increased tourist visits, more favorable weather conditions in 2016 and changes in ticket mix.

Construction Revenue

The construction business ceased operations in 2015 which is reflected in the elimination of construction revenues.

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Third-Party Management and Other Fees

The decrease reflects lower management fee income in the nine months ended September 30, 2016.

Other Revenues and Fees

The decrease was primarily due to a $2.5 million acquisition break-up fee received in the nine months ended September 30, 2015 and lower lease cancellation income in the nine months ended September 30, 2016.

Property Operating Expenses

The decrease in property operating expenses was primarily due to lower repairs and maintenance costs and lower utility costs.

General and Administrative Expenses

The increase in general and administrative expenses is due to $1.7 million of incremental legal costs pertaining to formation transactions litigation, $3.3 million related to higher 2016 incentive compensation bonus accruals and salaries, and $2.9 million related to equity compensation expense.  We went public in October 2013 and we are still ramping up, adding layers of amortization of non-cash compensation expense associated with equity incentive compensation.  Once we conclude four years as a public company, the equity incentive compensation expense should stabilize.

Observatory Expenses

The decrease in Observatory expenses primarily reflects lower personnel costs and lower legal fees.

Construction Expenses

The construction business ceased operations in 2015 which is reflected in the elimination of construction expenses.

Real Estate Taxes

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

Depreciation and Amortization

The decrease in depreciation and amortization was primarily attributable to assets that became fully depreciated during 2015.

Interest Expense

The increase in interest expense was due to higher debt balances as well as higher interest rates. In March 2015, we issued $350.0 million of senior unsecured notes with a weighted average fixed interest rate of 4.08%. The proceeds were partially used to repay our unsecured revolving credit facility which had a variable interest rate of 1.33% in the first quarter 2015.

Income taxes

The increase in income tax expense was attributable to activities within our taxable REIT subsidiaries, primarily due to higher Observatory taxable income for the nine months ended September 30, 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 that we will generate positive cash flows from operations. In order for ESRT to qualify as a REIT, ESRT is required under the Internal Revenue Code of 1986 to distribute to its stockholders, on an annual basis, at least 90% of its REIT taxable income, determined without

37

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 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, mortgage and debt financings 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, 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. ESRT's charter does not restrict the amount of leverage that we may use.

At September 30, 2016, we had approximately $594.3 million available in cash and cash equivalents, and there was $1.1 billion available under our unsecured revolving credit facility.

On August 23, 2016, QIA purchased 29,610,854 newly issued ESRT Class A common shares at $21.00 per share, resulting in gross proceeds of $621.8 million. The proceeds were contributed to us and we issued 29,610,854 Series PR units to ESRT. At August 23, 2016, the 29,610,854 units were equivalent to a 9.9% economic interest in us. QIA has a top-up right to maintain their ownership stake at 9.9% over time. Proceeds from the investment were used to pay down the $45.0 million balance on our revolving credit facility. We intend to use the remaining proceeds for general corporate purposes, including redevelopment of the portfolio and future investments.

In addition, for an initial period of five years from August 23, 2016, QIA will have the right of first offer to co-invest with us as a joint venture partner in real estate investment opportunities initiated by us where we have elected, at our discretion, to seek out a joint venture partner. The right of first offer period will be extended for 30 months so long as at least one joint venture transaction is consummated by us and QIA during the initial term, and will be extended for a further 30 month term if at least one more joint venture transaction is consummated during such initial extension period.

As of September 30, 2016, we had approximately $1.6 billion of total consolidated indebtedness outstanding, with a weighted average interest rate of 4.15% (excluding premiums and discount) and a weighted average maturity of 4.9 years. Excluding principal amortization, we have no debt maturing in 2016 and approximately $336.0 million of debt maturing in 2017. Our consolidated net debt to total market capitalization was approximately 14.0% as of September 30, 2016.

Unsecured Revolving Credit Facility

On January 23, 2015, we entered into an unsecured revolving credit agreement, which is referred to herein as the “unsecured revolving credit facility,” with Bank of America, Merrill Lynch, Goldman Sachs and the other lenders party thereto. Merrill Lynch acted as joint lead arranger; Bank of America acted as administrative agent; and Goldman Sachs acted as syndication agent and joint lead arranger. Certain of our subsidiaries are guarantors of our obligations under the unsecured revolving credit facility.

The unsecured revolving credit facility is comprised of a revolving credit facility in the maximum original principal amount of $800.0 million. The unsecured revolving credit facility contains an accordion feature that would allow us to increase the maximum aggregate principal amount to $1.25 billion under specified circumstances. On July 6, 2016, we partially exercised the accordion feature and increased our borrowing capacity under the unsecured revolving credit facility from $800 million to $1.1 billion. Amounts outstanding under the unsecured revolving credit facility bear interest at a floating rate equal to, at our election, (x) a Eurodollar rate, plus a spread that will range from 0.875% to 1.600% depending upon our leverage ratio and credit rating; or (y) a base rate, plus a spread that will range from 0.000% to 0.600% depending upon our leverage ratio and credit rating. In addition, the unsecured revolving credit facility permits us to borrow at competitive bid rates determined in accordance with procedures described in the unsecured revolving credit facility agreement.

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The unsecured revolving credit facility has an initial maturity in January 2019. We have the option to extend the initial term of the unsecured revolving credit facility for up to two additional six-month periods, subject to certain conditions, including the payment of an extension fee equal to 0.075% of the then outstanding commitments under the unsecured revolving credit facility.

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 $745.4 million plus 75% of net equity proceeds received by the operating partnership (other than proceeds received within ninety (90) 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, (vi) the ratio of total unsecured indebtedness to unencumbered asset value will not exceed 60%, and (vii) consolidated secured recourse indebtedness will not exceed 10% of total asset value (provided, however, this covenant shall not apply at any time after either the company or the operating partnership achieves debt ratings from at least two of Moody’s, S&P and Fitch, and such debt ratings are Baa3 or better (in the case of a rating by Moody’s) or BBB- or better (in the case of a rating by S&P or Fitch)). As of September 30, 2016, we were in compliance with the covenants (dollars in thousands):

Financial covenant	Required		September 30, 2016			In Compliance
Maximum total leverage	< 60%		27.0		%	Yes
Maximum secured debt	< 40%		12.5		%	Yes
Minimum fixed charge coverage	> 1.50x		3.3x			Yes
Minimum unencumbered interest coverage	> 1.75x		7.0x			Yes
Maximum unsecured leverage	< 60%		23.6		%	Yes
Maximum secured recourse indebtedness	< 10%		0.0		%	Yes
Minimum tangible net worth	$	1,203,815	$	1,596,702		Yes

The unsecured revolving credit facility contains customary covenants, including limitations on liens, investment, 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).

Senior Unsecured Notes

During March 2015, we issued and sold an aggregate principal amount of $350.0 million of senior unsecured notes ("Series A, B and C Senior Notes") in a private placement to entities affiliated with Prudential Capital Group. The Series A, B and C Senior Notes consist of $100 million of 3.93% Series A Senior Notes due 2025, $125 million of 4.09% Series B Senior Notes due 2027, and $125 million of 4.18% Series C Senior Notes due 2030. The proceeds were used to repay outstanding mortgage debt, to reduce amounts outstanding under our unsecured revolving credit facility and for other general corporate purposes.

The Series A, B and C Senior Notes are senior unsecured obligations and are unconditionally guaranteed by each of our subsidiaries that guarantees indebtedness under the senior unsecured revolving credit facility. Interest on the Series A, B and C Senior Notes is payable quarterly.

The terms of the Series A, B and C Senior Notes include customary covenants, including limitations on liens, investment, debt, fundamental changes, and transactions with affiliates and require certain customary financial reports. The Series A, B and C Senior Notes also require compliance with financial ratios consistent with the unsecured credit facility including a maximum leverage ratio, a maximum secured leverage ratio, a minimum amount of tangible net worth, a minimum fixed charge coverage ratio, a minimum unencumbered interest coverage ratio, a maximum unsecured leverage ratio and a

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maximum amount of secured recourse indebtedness. As of September 30, 2016, we were in compliance with the covenants under the Series A, B and C Senior Notes.

Unsecured Term Loan Facility

During August 2015, we entered into a new seven year $265.0 million senior unsecured term loan facility ("term loan facility"). The term loan facility matures on August 24, 2022. The term loan facility bears interest at a floating rate equal to, at our election, a LIBOR rate, plus a spread ranging from 1.400% to 2.350%; or a base rate, plus a spread ranging from 0.400% to 1.350%. In each case the spread is determined by our leverage ratio and credit rating. Pursuant to a forward interest rate swap agreement, we effectively fixed LIBOR at 2.1485% for $265.0 million of the term loan facility for the period from August 31, 2017 through maturity. The proceeds from the term loan facility were used to repay borrowings made under our unsecured revolving credit facility.

The terms of the term loan facility agreement include customary covenants, including limitations on liens, investment, debt, fundamental changes, and transactions with affiliates and require certain customary financial reports. The term loan facility requires compliance with financial ratios including a maximum leverage ratio, a maximum secured leverage ratio, a minimum amount of tangible net worth, a minimum fixed charge coverage ratio, a minimum unencumbered interest coverage ratio, a maximum unsecured leverage ratio and a maximum amount of secured recourse indebtedness. It also contains customary events of default (subject in certain cases to specified cure periods). These terms in the term loan facility agreement are consistent with the terms in our unsecured revolving credit facility agreement. As of September 30, 2016, we were in compliance with the covenants under the term loan facility. 

Mortgage Debt

As of September 30, 2016, we had mortgage debt outstanding of $763.5 million. During the first quarter of 2016, we refinanced at a lower rate a $20.2 million 6.0% mortgage loan secured by 10 Union Square East. The new $50.0 million mortgage loan has a ten year maturity and bears interest at a fixed rate of 3.7%. As a result of the refinancing, we expensed $0.2 million of unamortized deferred financing costs and incurred a $0.4 million prepayment penalty which will be offset by interest cost savings.

Leverage Policies

We expect to employ leverage in our capital structure in amounts determined from time to time by ESRT's board of directors. Although ESRT's board of directors has not adopted a policy that limits the total amount of indebtedness that we may incur, we anticipate that ESRT's 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. ESRT's 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 currently intend to maintain a level of indebtedness consistent with our plan to seek an investment grade credit rating. ESRT's 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 ESRT's common stock and our traded OP units, 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	2016		2015
Number of leases signed(2)	130		194
Total square feet	741,843		939,989
Leasing commission costs(3)	$	13,105	$	13,516
Tenant improvement costs(3)	44,788		50,342
Total leasing commissions and tenant improvement costs(3)	$	57,893	$	63,858
Leasing commission costs per square foot(3)	$	17.67	$	14.38
Tenant improvement costs per square foot(3)	60.37		53.56
Total leasing commissions and tenant improvement costs per square foot(3)	$	78.04	$	67.94

Retail Properties⁽⁴⁾

	Nine months ended September 30,
Total New Leases, Expansions, and Renewals	2016		2015
Number of leases signed(2)	13		12
Total square feet	39,183		70,940
Leasing commission costs(3)	$	2,221	$	10,263
Tenant improvement costs(3)	4,433		2,234
Total leasing commissions and tenant improvement costs(3)	$	6,654	$	12,497
Leasing commission costs per square foot(3)	$	56.69	$	144.67
Tenant improvement costs per square foot(3)	113.13		31.49
Total leasing commissions and tenant improvement costs per square foot(3)	$	169.82	$	176.16

_______________

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

	Nine months ended September 30,
	2016		2015
Total Portfolio
Capital expenditures (1)	$	54,975	$	36,718

_______________

(1) Includes all capital expenditures, excluding tenant improvements and leasing commission costs, which are primarily attributable to the redevelopment and repositioning program conducted at our Manhattan office properties.

As of September 30, 2016, we expect to incur additional costs relating to obligations under signed new leases of approximately $57.1 million, consisting of approximately $56.5 million for tenant improvements and other improvements related to new leases and approximately $0.6 million for 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.

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Contractual Obligations

Refer to our Annual Report on Form 10-K for the year ended December 31, 2015 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, 2016.

Off-Balance Sheet Arrangements

As of September 30, 2016, we did not have any off-balance sheet arrangements.

Distribution Policy

In order for ESRT to qualify as a REIT, it must distribute to its stockholders, on an annual basis, at least 90% of its REIT taxable income, determined without regard to the deduction for dividends paid and excluding net capital gains. In addition, it will be subject to U.S. federal income tax at regular corporate rates to the extent that it distributes less than 100% of its net taxable income (including net capital gains) and will be subject to a 4% nondeductible excise tax on the amount, if any, by which its 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 allow ESRT to satisfy its REIT 90% distribution requirement and to allow ESRT to avoid U.S. federal income tax liability on its 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 units in order to allow ESRT to satisfy its 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 $83.3 million have been made to securityholders for the nine months endedSeptember 30, 2016.

Cash Flows

Comparison of Nine Months Ended September 30, 2016 to the Nine Months Ended September 30, 2015

Net cash. Cash and cash equivalents were $594.3 million and $46.4 million, respectively, as of September 30, 2016 and 2015.

Operating activities. Net cash provided by operating activities increased by $2.5 million, to $162.1 million, for the nine months endedSeptember 30, 2016 compared to $159.6 million for the nine months endedSeptember 30, 2015, primarily due to higher cash rents.

Investing activities. Net cash used in investing activities increased by $15.3 million, to $120.3 million, for the nine months endedSeptember 30, 2016 compared to $105.0 million for the nine months endedSeptember 30, 2015, primarily due to higher expenditures on building and tenant improvements.

Financing activities. Net cash provided by financing activities increased by $559.8 million, to $505.8 million, for the nine months endedSeptember 30, 2016 compared to $54.0 million used in financing activities for the nine months endedSeptember 30, 2015. The increase was from the net proceeds on issuance of common stock in the third quarter 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

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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 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,
	2016			2015			2016			2015
	(unaudited)						(unaudited)
Net income	$	32,897		$	26,085		$	74,242		$	60,558
Add:
General and administrative expenses	11,798			10,182			35,623			28,395
Depreciation and amortization	37,607			45,169			115,382			126,216
Interest expense	17,939			16,680			53,310			50,298
Construction expenses	—			—			—			3,222
Acquisition expenses	—			193			98			193
Income tax expense	2,750			2,578			4,340			3,283
Less:
Construction revenue	—			—			—			(1,981		)
Acquisition break-up fee	—			(2,500		)	—			(2,500		)
Third-party management and other fees	(404		)	(618		)	(1,372		)	(1,658		)
Net operating income	$	102,587		$	97,769		$	281,623		$	266,026
Other Net Operating Income Data
Straight-line rental revenue	$	9,619		$	5,441		$	21,495		$	15,165
Net increase in rental revenue from the amortization of above- and below-market lease assets and liabilities	$	1,210		$	4,795		$	6,285		$	14,662
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 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 July 2014 acquisition of two 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: private perpetual preferred exchange offering expenses, acquisition expenses, gain on settlement of lawsuit related to the Observatory, net of income taxes, deferred financing costs write-offs, prepayment penalties, construction severance expenses 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 unit amounts):

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	Three Months Ended September 30,						Nine months ended September 30,
	2016			2015			2016			2015
	(unaudited)						(unaudited)
Net income	$	32,897		$	26,085		$	74,242		$	60,558
Private perpetual preferred unit distributions	(234		)	(234		)	(702		)	(702		)
Real estate depreciation and amortization	37,318			45,072			114,779			125,847
FFO attributable to common stockholders and non-controlled interests	69,981			70,923			188,319			185,703
Amortization of below-market ground leases	1,957			1,957			5,873			5,873
Modified FFO attributable to common stockholders and non-controlled interests	71,938			72,880			194,192			191,576
Acquisition break-up fee	—			(2,500		)	—			(2,500		)
Deferred financing costs write-off and prepayment penalty	—			—			552			1,749
Acquisition expenses	—			193			98			193
Construction severance expenses, net of taxes	—			—			—			480
Core FFO attributable to common stockholders and non-controlled interests	$	71,938		$	70,573		$	194,842		$	191,498
Weighted average Operating Partnership units
Basic	278,739			265,873			270,388			265,868
Diluted	280,614			265,873			271,028			265,868

Factors That May Influence Future Results of Operations

Leasing

We signed 1.2 million rentable square feet of new leases, expansions and lease renewals for the year ended December 31, 2015. During the nine months endedSeptember 30, 2016, we signed 0.8 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, 2016, there were approximately 1.0 million rentable square feet of space in our portfolio available to lease (excluding leases signed but not yet commenced) representing 9.7% of the net rentable square footage of the properties in our portfolio. In addition, leases representing 1.7% and 6.7% of net rentable square footage of the properties in our portfolio will expire in 2016 and in 2017, respectively. These leases are expected to represent approximately 1.8% and 7.0%, 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-

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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.

Observatory and Broadcasting Operations

The Empire State Building Observatory revenue for the third quarter 2016 was $38.1 million, compared to $35.7 million for the third quarter 2015. The Observatory hosted approximately 1,340,000 visitors in the third quarter 2016 versus 1,327,000 visitors in the third quarter 2015. In the third quarter 2016, there were ten bad weather days, four of which fell on weekend days, compared to six bad weather days, zero of which fell on weekend days, in the third quarter 2015.

For the nine months ended September 30, 2016, the Empire State Building Observatory hosted 3,183,000 visitors versus 3,114,000 visitors from the same period in 2015. Observatory revenue was $91.1 million for the nine months endedSeptember 30, 2016, a 7.8% increase from $84.5 million for the nine months ended September 30, 2015. For the nine months ended September 30, 2016, there were 31 bad weather days, eight of which fell on weekend days, compared to 52 bad weather days, 15 of which fell on weekend days, in the nine months ended September 30, 2015.

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 the One World Trade Center and Rockefeller Center 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, 2016, we derived $16.6 million of revenue and $6.2 million of expense reimbursements from the Empire State Building’s broadcasting licenses and related leases. The broadcasting licenses and related leases generally expire between 2016 and 2031. The business of broadcasting TV and radio signals over the air is in flux, due to deteriorating industry fundamentals and the upcoming Federal Communications Commission spectrum auction, and there is a new competitor in the market at One World Trade Center. We have made preliminary renewal proposals which, if accepted, would yield reduced revenues and higher capital expenditures.

We have renewed and extended our leases and licenses with Univision Television Group from their current expirations in 2016 and 2018 to a new expiration in December 2025.  Three of our existing broadcast tenants, CBS Broadcasting, NBC Universal Media, and WNET have notified us that they will vacate the Empire State Building at the end of their current lease terms.  The non-renewing leases with CBS, NBC and WNET generated approximately $6.3 million in aggregate revenue in 2015, inclusive of expense reimbursements, and their leases expire in 2017 and 2018.  Revenue from Univision totaled approximately $2.9 million, inclusive of expense reimbursements in 2015. Effective January 2016, annual revenue from Univision adjusted to an initial amount of $1.9 million, and is subject to escalations.

We renewed and extended our lease and licenses with Emmis Communications, which operates three FM radio stations at the Empire State Building, for 16 years. For the year ended December 31, 2015, revenue from Emmis Communications totaled approximately $1.7 million (inclusive of expense reimbursements). Effective January 2016, annual revenue from Emmis Communications adjusted to an initial amount of $1.3 million, and is subject to escalations.

We have renewed and extended an additional lease and license with a broadcast tenant with terms subject to a confidentiality agreement.

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, 2015.

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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, 2016, our variable rate debt of $265.0 million represented 3.3% of our total enterprise value.

Subject to maintaining ESRT's 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 term loan, unsecured revolving credit facility and mortgage refinancing. 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.

During 2015 we entered into three interest rate LIBOR swaps with effective dates of July 5, 2017 and August 31, 2017 and an aggregate notional value of $465.0 million, which fixes interest rates at 2.1485% and 2.5050%, and mature between August 24, 2022 and July 5, 2027. These interest rate swaps have been designated as cash flow hedges and are deemed effective as of September 30, 2016 with a net liability fair value of $31.2 million which is included in accounts payable and accrued expenses on the condensed consolidated balance sheet.

Based on our variable rate debt balances, interest expense would have increased by approximately $2.6 million if short-term interest rates had been 1% higher. As of September 30, 2016, the weighted average interest rate on the $1.4 billion of fixed-rate indebtedness outstanding was 4.55% per annum, each with maturities at various dates through March 27, 2030.

As of September 30, 2016, the fair value of our outstanding debt was approximately $1.7 billion, which was approximately $74.9 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.

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 ESRT's 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, 2016, the end of the period covered by this Report, we carried out an evaluation, under the supervision and with the participation of ESRT management, including ESRT's 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, ESRT's 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 ESRT's Chief Executive Officer and Chief Financial Officer, as appropriate to allow for timely decisions regarding required disclosure.     

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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

The following updates and supersedes our risk factors set forth in our Annual Report on Form 10-K for the year ended December 31, 2015 (the “2015 Form 10-K”). These supplemental risk factors specifically provide an update in connection with our and ESRT's sale of a 9.9% fully diluted interest in us to QIA in August 2016.  For a discussion of our additional risk factors, see Item 1A (Risk Factors) in Part I of the 2015 Form 10-K. Except as disclosed below, there have been no material changes from the risk factors and uncertainties disclosed in our 2015 Annual Report.

Tax protection agreement with QIA could limit our ability either to sell certain properties or to engage in a strategic transaction, which could materially and adversely affect us.

In connection with our and ESRT's sale of a 9.9% fully diluted interest in us to QIA in August 2016, ESRT 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 ESRT pays that are attributable to capital gains from the sale or exchange of any U.S. real property interests. If ESRT were to trigger the tax indemnification obligations under this agreement, we and ESRT would be required to pay QIA for the resulting tax consequences, as applicable. Moreover, this obligation may restrict our and ESRT's ability to engage in a strategic transaction, and/or inhibit our selling or disposing of a property that might otherwise be in the best interest of the securityholders to do so.

ESRT's charter contains stock ownership limits, which may delay or prevent a change of control.

In order for ESRT to qualify as a REIT no more than 50% in value of ESRT's outstanding capital stock may be owned, directly or indirectly, by five or fewer individuals during the last half of any calendar year, and at least 100 persons must beneficially own our stock during at least 335 days of a taxable year of 12 months, or during a proportionate portion of a shorter taxable year. “Individuals” for this purpose include natural persons, private foundations, some employee benefit plans and trusts and some charitable trusts. To assist ESRT in complying with these limitations, among other purposes, ESRT's charter generally prohibits any person from directly or indirectly owning more than 9.8% in value or number of shares, whichever is more restrictive, of the outstanding shares of ESRT's capital stock or more than 9.8% in value or number of shares, whichever is more restrictive, of the outstanding shares of ESRT's common stock. These ownership limitations could have the effect of discouraging a takeover or other transaction in which holders of ESRT's common stock might receive a premium for their shares over the then prevailing market price or which holders might believe to be otherwise in their best interests. ESRT has entered into a waiver of the 9.8% ownership limit with an institutional investor to permit this investor to own up to 15% of the outstanding shares of ESRT's Class A common stock, as well as an additional waiver to permit affiliates of QIA to own an aggregate amount of Class A common stock equal to up to a 9.9% fully diluted economic interest in ESRT (inclusive of all outstanding common OP units and LTIP units), which currently equals in excess of 19.4% of ESRT's outstanding Class A Common stock.

ESRT's charter’s constructive ownership rules are complex and may cause the outstanding shares owned by a group of related individuals or entities to be deemed to be constructively owned by one individual or entity. As a result, the acquisition of less than these percentages of the outstanding shares by an individual or entity could cause that individual or entity to own constructively in excess of these percentages of the outstanding shares and thus violate the share ownership limits. ESRT's charter also provides that any attempt to own or transfer shares of ESRT's common stock or preferred stock (if and when issued) in excess of the stock ownership limits without the consent of ESRT's board of directors or in a manner that would cause ESRT to be “closely held” under Section 856(h) of the Code (without regard to whether the shares are held during the last half of a taxable year) will result in the shares being deemed to be transferred to a trustee for a charitable trust or, if the transfer

48

to the charitable trust is not automatically effective to prevent a violation of the share ownership limits or the restrictions on ownership and transfer of ESRT shares, any such transfer of ESRT shares will be null and void.

The concentration of ESRT's voting power may adversely affect the ability of new investors to influence ESRT's policies.

As of September 30, 2016, Anthony E. Malkin, ESRT's Chairman and Chief Executive Officer, together with the Malkin Group, has the right to vote 42,101,592 shares of ESRT's common stock, which represents approximately 20.2% of the voting power of ESRT's outstanding common stock. Consequently, Mr. Malkin has the ability to influence the outcome of matters presented to ESRT' securityholders, including the election of ESRT's board of directors and approval of significant corporate transactions, such as business combinations, consolidations and mergers and the determination of ESRT's day-to-day corporate and management policies.

In August 2016, we and ESRT sold a 9.9% fully diluted interest in us to QIA, which initially represented 19.4% of the outstanding ESRT Class A common stock. Pursuant to the terms of ESRT's stockholders agreement with QIA, QIA generally has the right (but not the obligation) to maintain its fully diluted economic interest in ESRT by purchasing additional shares of ESRT's Class A common stock when ESRT or we issue additional common equity securities from time to time. While QIA has agreed to limit its voting power on all matters presented to ESRT's securityholders to no more than 9.9% of total number of votes entitled to be cast, QIA has also agreed to vote its shares in favor of the election of all director nominees recommended by ESRT's board of directors.

The interests of Mr. Malkin and QIA could conflict with or differ from your interests as a securityholder, and these large securityholders may exercise their right as securityholders to restrict our ability to take certain actions that may otherwise be in the best interests of our and ESRT's securityholders. This concentration of voting power might also have the effect of delaying or preventing a change of control that our or ESRT's securityholders may view as beneficial.

The future exercise of registration rights may adversely affect the market price of our common stock.

We or ESRT cannot predict whether future issuances of shares of ESRT's common stock or our operating partnership units or the availability of shares for resale in the open market will decrease the market price per share/unit of ESRT's common stock and traded OP units. In August 2016, ESRT entered into a registration rights agreement with QIA in connection with its purchase of 29,610,854 shares of ESRT Class A common stock, which requires ESRT to use commercially reasonable efforts to file with the Securities and Exchange Commission within 180 days following the closing of the sale, a resale shelf registration statement providing for the resale of QIA’s shares. Subsequently, QIA will be entitled to cause ESRT to include in the registration statement such additional shares of ESRT's Class A common stock as QIA may acquire from time to time, up to a 9.9% fully diluted interest in ESRT. We and ESRT will bear the costs of registering the securities subject to the registration rights agreement, and once these shares are registered, they will be freely tradable, subject to any applicable lock-up agreements. The registration and availability of such a significant number of securities for trading in the public market may have an adverse effect on the market price of ESRT's common stock and our traded OP units and could impair ESRT's and our ability to raise additional capital through the sale of equity securities in the future. In particular, QIA currently owns in excess of 19.4% of the outstanding shares of ESRT's Class A common stock. If QIA decides to sell all or a substantial portion of its shares, it could have a material adverse impact on the market price of ESRT's common stock and our traded OP units. In addition, future sales of shares of ESRT common stock may be dilutive to our securityholders.

Failure to qualify as a domestically-controlled REIT could subject ESRT's non-U.S. securityholders to adverse federal income tax consequences.

A foreign person (other than a “qualified foreign pension plan”) disposing of a U.S. real property interest, including shares of a U.S. corporation whose assets consist principally of U.S. property interests, is generally subject to tax under the Foreign Investment in Real Property Tax Act of 1980 ("FIRPTA") on the gain recognized on the disposition. FIRPTA does not apply, however, to the disposition of stock in a REIT if the REIT is a “domestically controlled REIT.” In general, ESRT will be a domestically controlled REIT if at all times during a specified testing period, less than 50% in value of ESRT shares are held directly or indirectly by non-U.S. holders. While ESRT intends to continue to qualify as a "domestically controlled" REIT, we and ESRT cannot assure that result, as ESRT Class A common stock is publicly traded, QIA (a non-U.S. holder) recently acquired more than 19% of ESRT common stock and other non-U.S. holders may now or in the future hold additional shares. If ESRT were to fail to qualify, gain realized by a foreign investor (other than a “qualified foreign pension plan”) on a sale of ESRT common stock would be subject to FIRPTA unless (a) ESRT common stock was on an established securities market and

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the foreign investor did not at any time during a specific testing period directly or indirectly own more than 10% of the value of ESRT outstanding common stock, or (b) another exemption from FIRPTA were applicable.

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

See our Current Report on Form 8-K filed with the SEC on August 23, 2016.

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 OP, L.P.

By: Empire State Realty Trust, Inc., its general partner

Date: November 8, 2016                             By:/s/ David A. Karp

Executive Vice President and Chief Financial Officer

(Principal Financial Officer)

Date: November 8, 2016                             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
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 OP, L.P.;

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 8, 2016 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 OP, L.P.;

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 8, 2016 By: /s/ David A. Karp 
David A. Karp Executive Vice President and Chief Financial Officer

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 OP, L.P. (the "Company"), hereby certifies, to his knowledge that the Quarterly Report on Form 10-Q for the nine months ended September 30, 2016 (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 8, 2016 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 OP, L.P. (the "Company"), hereby certifies, to his knowledge that the Quarterly Report on Form 10-Q for the nine months ended September 30, 2016 (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 8, 2016 By: /s/ David A. Karp 
David A. Karp Executive Vice President and Chief Financial Officer

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Nov. 01, 2016
Entity Registrant Name	Empire State Realty OP, L.P.
Entity Central Index Key	0001553079
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q3
Entity Filer Category	Large Accelerated Filer
Series ES operating partnership units
Entity Common Stock, Shares Outstanding		36,023,638
Series 60 operating partnership units
Entity Common Stock, Shares Outstanding		9,753,105
Series 250 operating partnership units
Entity Common Stock, Shares Outstanding		4,809,410

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Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Commercial real estate properties, at cost:
Land	$ 201,196	$ 201,196
Development costs	7,946	7,498
Building and improvements	2,196,864	2,067,636
Commercial real estate properties, at cost	2,406,006	2,276,330
Less: accumulated depreciation	(532,406)	(465,584)
Commercial real estate properties, net	1,873,600	1,810,746
Cash and cash equivalents	594,297	46,685
Restricted cash	60,752	65,880
Tenant and other receivables, net of allowance of $4,242 and $2,792 in 2016 and 2015, respectively	19,569	18,782
Deferred rent receivables, net of allowance of $228 and $245 in 2016 and 2015, respectively	143,578	122,048
Prepaid expenses and other assets	33,685	50,460
Deferred costs, net	287,591	310,679
Acquired below-market ground leases, net	378,018	383,891
Goodwill	491,479	491,479
Total assets	3,882,569	3,300,650
Liabilities:
Mortgage notes payable, net	763,457	747,661
Senior unsecured notes, net	589,546	587,018
Unsecured term loan facility, net	262,830	262,545
Unsecured revolving credit facility, net	0	35,192
Accounts payable and accrued expenses	154,573	111,099
Acquired below-market leases, net	87,708	104,171
Deferred revenue and other liabilities	24,176	31,388
Tenants’ security deposits	47,440	48,890
Total liabilities	1,929,730	1,927,964
Commitments and contingencies
Capital:
Private perpetual preferred units, $16.62 per unit liquidation preference, 1,560,360 issued and outstanding in 2016 and 2015	8,004	8,004
Total capital	1,952,839	1,372,686
Total liabilities and capital	3,882,569	3,300,650
Series PR operating partnership units
Capital:
ESRT partner's capital (2,990,995 and 2,675,740 general partner operating partnership units and 151,934,649 and 117,347,639 limited partner operating partnership units outstanding in 2016 and 2015, respectively)	1,137,558	524,729
Limited partner operating partnership units	785,294	809,901
Series ES operating partnership units
Capital:
Limited partner operating partnership units	16,291	22,074
Series 60 operating partnership units
Capital:
Limited partner operating partnership units	3,845	5,366
Series 250 operating partnership units
Capital:
Limited partner operating partnership units	$ 1,847	$ 2,612

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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Tenant and other receivables allowance	$ 4,242	$ 2,792
Deferred rent receivables allowance	$ 228	$ 245
Private perpetual preferred 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
General partner operating partnership units outstanding (in shares)	154,925,644
Limited partner operating partnership units, outstanding (in shares)	144,173,889
Series PR operating partnership units
Limited partner operating partnership units, outstanding (in shares)	93,507,101	93,863,451
Series ES operating partnership units
Limited partner operating partnership units, outstanding (in shares)	36,061,948	38,262,650
Series 60 operating partnership units
Limited partner operating partnership units, outstanding (in shares)	9,794,230	10,318,492
Series 250 operating partnership units
Limited partner operating partnership units, outstanding (in shares)	4,810,610	5,106,039
ESRT | Series PR operating partnership units
General partner operating partnership units outstanding (in shares)	2,990,995	2,675,740
Limited partner operating partnership units, outstanding (in shares)	151,934,649	117,347,639

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Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues:
Rental revenue	$ 115,634	$ 110,903	$ 343,155	$ 333,827
Tenant expense reimbursement	19,176	23,096	56,350	59,878
Observatory revenue	38,093	35,702	91,112	84,525
Construction revenue	0	0	0	1,981
Third-party management and other fees	404	618	1,372	1,658
Other revenue and fees	2,541	5,460	6,748	10,565
Total revenues	175,848	175,779	498,737	492,434
Operating expenses:
Property operating expenses	38,585	41,052	115,075	120,341
Ground rent expenses	2,331	2,331	6,994	6,994
General and administrative expenses	11,798	10,182	35,623	28,395
Observatory expenses	7,250	7,896	21,900	23,391
Construction expenses	0	0	0	3,222
Real estate taxes	24,691	23,613	71,773	69,543
Acquisition expenses	0	193	98	193
Depreciation and amortization	37,607	45,169	115,382	126,216
Total operating expenses	122,262	130,436	366,845	378,295
Total operating income (loss)	53,586	45,343	131,892	114,139
Interest expense	(17,939)	(16,680)	(53,310)	(50,298)
Income (loss) before income taxes	35,647	28,663	78,582	63,841
Income tax expense	(2,750)	(2,578)	(4,340)	(3,283)
Net income (loss)	32,897	26,085	74,242	60,558
Private perpetual preferred unit distributions	(234)	(234)	(702)	(702)
Net income attributable to common unitholders	$ 32,663	$ 25,851	$ 73,540	$ 59,856
Total weighted average units:
Basic (in units)	278,739	265,873	270,388	265,868
Diluted (in units)	280,614	265,873	271,028	265,868
Earnings per unit attributable to common unitholders:
Basic earnings (in dollars per unit)	$ 0.12	$ 0.10	$ 0.27	$ 0.22
Diluted earnings (in dollars per unit)	0.12	0.10	0.27	0.22
Dividends per unit (in dollars per unit)	$ 0.105	$ 0.085	$ 0.295	$ 0.255

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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 32,897	$ 26,085	$ 74,242	$ 60,558
Other comprehensive income (loss):
Change in unrealized gain (loss) on valuation of interest rate swap agreements	930	(4,384)	(29,305)	(4,384)
Other comprehensive income (loss)	930	(4,384)	(29,305)	(4,384)
Comprehensive income	$ 33,827	$ 21,701	$ 44,937	$ 56,174

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Condensed Consolidated Statements of Capital - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance		$ 1,372,686
Issuance of OP units, net of costs		611,278
Equity compensation		7,254
Distributions		(83,316)
Net income	$ 32,897	74,242
Change in unrealized gain (loss) on valuation of interest rate swap agreements	930	(29,305)
Ending balance	$ 1,952,839	$ 1,952,839
General Partner | Series PR operating partnership units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)		120,023,000
Beginning balance		$ 524,729
Issuance of OP units, net of costs (in units)		29,611,000
Issuance of OP units, net of costs		$ 611,278
Conversion of operating partnership units to ESRT Partner's Capital (in units)		5,245,000
Conversion of operating partnership units to ESRT Partner's Capital		$ 19,941
Equity compensation (in units)		46,000
Equity compensation		$ 355
Distributions		(39,491)
Net income		34,490
Change in unrealized gain (loss) on valuation of interest rate swap agreements		$ (13,744)
Ending balance (in units)	154,925,000	154,925,000
Ending balance	$ 1,137,558	$ 1,137,558
Limited Partner | Series PR operating partnership units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)		93,863,000
Beginning balance		$ 809,901
Conversion of operating partnership units to ESRT Partner's Capital (in units)		(2,225,000)
Conversion of operating partnership units to ESRT Partner's Capital		$ (18,687)
Equity compensation (in units)		1,869,000
Equity compensation		$ 6,899
Distributions		(27,814)
Net income		24,930
Change in unrealized gain (loss) on valuation of interest rate swap agreements		$ (9,935)
Ending balance (in units)	93,507,000	93,507,000
Ending balance	$ 785,294	$ 785,294
Limited Partner | Series ES operating partnership units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)		38,262,000
Beginning balance		$ 22,074
Conversion of operating partnership units to ESRT Partner's Capital (in units)		(2,201,000)
Conversion of operating partnership units to ESRT Partner's Capital		$ (960)
Distributions		(10,883)
Net income		10,075
Change in unrealized gain (loss) on valuation of interest rate swap agreements		$ (4,015)
Ending balance (in units)	36,061,000	36,061,000
Ending balance	$ 16,291	$ 16,291
Limited Partner | Series 60 operating partnership units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)		10,318,000
Beginning balance		$ 5,366
Conversion of operating partnership units to ESRT Partner's Capital (in units)		(524,000)
Conversion of operating partnership units to ESRT Partner's Capital		$ (191)
Distributions		(2,967)
Net income		2,721
Change in unrealized gain (loss) on valuation of interest rate swap agreements		$ (1,084)
Ending balance (in units)	9,794,000	9,794,000
Ending balance	$ 3,845	$ 3,845
Limited Partner | Series 250 operating partnership units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)		5,106,000
Beginning balance		$ 2,612
Conversion of operating partnership units to ESRT Partner's Capital (in units)		(295,000)
Conversion of operating partnership units to ESRT Partner's Capital		$ (103)
Distributions		(1,459)
Net income		1,324
Change in unrealized gain (loss) on valuation of interest rate swap agreements		$ (527)
Ending balance (in units)	4,811,000	4,811,000
Ending balance	$ 1,847	$ 1,847
Private Perpetual Preferred Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)		1,560,000
Beginning balance		$ 8,004
Distributions		(702)
Net income		$ 702
Ending balance (in units)	1,560,000	1,560,000
Ending balance	$ 8,004	$ 8,004

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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash Flows From Operating Activities
Net income	$ 74,242	$ 60,558
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	115,382	126,216
Amortization of deferred financing costs and debt premiums and discount	516	1,626
Amortization of acquired above- and below-market leases, net	(6,285)	(14,662)
Amortization of acquired below-market ground leases	5,873	5,873
Straight-lining of rental revenue	(21,495)	(15,165)
Equity based compensation	7,254	4,259
Increase (decrease) in cash flows due to changes in operating assets and liabilities:
Restricted cash	3,120	5,268
Tenant and other receivables	(788)	(8,661)
Deferred leasing costs	(18,642)	(26,533)
Prepaid expenses and other assets	16,775	14,745
Accounts payable and accrued expenses	(6,671)	(4,107)
Deferred revenue and other liabilities	(7,213)	10,190
Net cash provided by operating activities	162,068	159,607
Cash Flows From Investing Activities
Decrease (increase) in restricted cash for investing activities	558	(672)
Development costs	(450)	(493)
Additions to building and improvements	(120,401)	(103,835)
Net cash used in investing activities	(120,293)	(105,000)
Cash Flows From Financing Activities
Proceeds from mortgage notes payable	50,000	0
Repayment of mortgage notes payable	(29,220)	(143,903)
Proceeds from unsecured revolving credit facility	50,000	615,000
Repayments of unsecured revolving credit facility	(90,000)	(595,000)
Repayments of term loan and credit facility	0	(470,000)
Proceeds from senior unsecured notes	0	350,000
Proceeds from unsecured term loan	0	265,000
Net proceeds from the sale of common units	611,278	0
Deferred financing costs	(2,905)	(6,128)
Distributions	(83,316)	(68,920)
Net cash provided by (used in) financing activities	505,837	(53,951)
Net increase in cash and cash equivalents	547,612	656
Cash and cash equivalents—beginning of period	46,685	45,732
Cash and cash equivalents—end of period	594,297	46,388
Supplemental disclosures of cash flow information:
Cash paid for interest	53,286	49,305
Cash paid for income taxes	3,495	3,258
Non-cash investing and financing activities:
Building and improvements included in accounts payable and accrued expenses	71,444	47,029
Derivative instruments at fair values included in accounts payable and accrued expenses	31,227	4,384
Conversion of limited partners' operating partnership units to ESRT partner's capital	$ 19,941	$ 53,120

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Description of Business and Organization

9 Months Ended

Sep. 30, 2016

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," and the "company,” mean Empire State Realty OP, L.P. and its consolidated subsidiaries.

Empire State Realty OP, L.P. is the entity through which Empire State Realty Trust, Inc. (“ESRT”), a self-administered and self-managed real estate investment trust, or REIT, conducts all of its business and owns (either directly or through subsidiaries) substantially all of its assets. We own, manage, operate, acquire and reposition office and retail properties in Manhattan and the greater New York metropolitan area. As of September 30, 2016, 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 502,429 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, 2016, our portfolio included four standalone retail properties located in Manhattan and two standalone retail properties located in the city center of Westport, Connecticut, encompassing 204,452 rentable square feet in the aggregate.

We were organized as a Delaware limited partnership on November 28, 2011 and operations commenced upon completion of the initial public offering of ESRT’s Class A common stock and related formation transactions on October 7, 2013. ESRT, as the sole general partner in our company, has responsibility and discretion in the management and control in our company, and our limited partners, in such capacity, have no authority to transact business for, or participate in the management activities, of our company. As of September 30, 2016, ESRT owned approximately 51.8% of our operating partnership units.

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Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2016

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, 2015 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.

For purposes of comparison, certain items shown in the 2015 unaudited condensed consolidated financial statements have been reclassified to conform to the presentation used for 2016. For 2015 periods presented, certain Empire State Building public relations costs previously included in property operating expenses are included in observatory expenses. For the three and nine months ended September 30, 2016, these costs were $0.5 million and $1.8 million, respectively, and for the three and nine months ended September 30, 2015, these costs were $0.6 million and $1.7 million, respectively.

    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, 2015 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 as well as whether the entity is a variable interest entity (“VIE”) and we are 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. We had no VIEs as of September 30, 2016 and December 31, 2015.

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 reimbursement, estimate of percentage of completion on construction contracts, 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.

Recently Issued or Adopted Accounting Standards

During August 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("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. We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

During January 2016, the FASB issued ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Liabilities, which makes targeted improvements to existing generally accepted accounting principles by requiring, among others, i) equity investments (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income, and ii) public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, iii) separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (that is, securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements. ASU No. 2016-01 will take effect for public companies for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

During April 2015, the FASB issued ASU No. 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs, which amends the requirements for the presentation of debt issuance costs and requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. ASU No. 2015-03 is effective for fiscal years, beginning after December 15, 2015 and interim periods within those fiscal years. ASU No. 2015-03 was amended in August 2015 by ASU No. 2015-15, Interest - Imputation of Interest (Subtopic 835-30) - Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements, to add to the Codification SEC staff guidance that the SEC staff will not object to an entity presenting the costs of securing line-of-credit arrangements as an asset, regardless of whether there are any outstanding borrowings. The SEC Observer to the Emerging Issues Task Force announced the staff guidance in response to questions that arose after the FASB issued ASU No. 2015-03. We adopted ASU 2015-03 as of December 31, 2015.

During February 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810) - Amendments to the Consolidation Analysis, which amends the criteria for determining which entities are considered VIEs, amends the criteria for determining if a service provider possesses a variable interest in a VIE and ends the deferral granted to investment companies for application of the VIE consolidation model. ASU No. 2015-02 is effective for fiscal years, beginning after December 15, 2015 and interim periods within those fiscal years. The implementation of this update did not cause any material changes to 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 will be effective beginning in 2017 and 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. We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

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Deferred Costs, Acquired Lease Intangibles and Goodwill

9 Months Ended

Sep. 30, 2016

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, 2016 and December 31, 2015 (amounts in thousands):

	September 30, 2016			December 31, 2015
Leasing costs	$	137,925		$	121,864
Acquired in-place lease value and deferred leasing costs	258,880			285,902
Acquired above-market leases	76,532			81,680
	473,337			489,446
Less: accumulated amortization	(190,773		)	(178,767		)
Total deferred costs, net, excluding net deferred financing costs	$	282,564		$	310,679

At September 30, 2016, $5.0 million 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 $6.1 million and $7.8 million for the three months ended September 30, 2016 and 2015, respectively, and $17.6 million and $19.2 million for the nine months endedSeptember 30, 2016 and 2015, respectively. Amortization expense related to acquired lease intangibles was $5.0 million and $9.8 million for the three months ended September 30, 2016 and 2015, respectively, and $19.7 million and $29.4 million for the nine months endedSeptember 30, 2016 and 2015, respectively.

Amortizing acquired intangible assets and liabilities consisted of the following as of September 30, 2016 and December 31, 2015 (amounts in thousands):

	September 30, 2016			December 31, 2015
Acquired below-market ground leases	$	396,916		$	396,916
Less: accumulated amortization	(18,898		)	(13,025		)
Acquired below-market ground leases, net	$	378,018		$	383,891

	September 30, 2016			December 31, 2015
Acquired below-market leases	$	(135,633	)	$	(163,290	)
Less: accumulated amortization	47,925			59,119
Acquired below-market leases, net	$	(87,708	)	$	(104,171	)

Rental revenue related to the amortization of below-market leases, net of above-market leases, was $1.2 million and $4.8 million for the three months ended September 30, 2016 and 2015, respectively, and $6.3 million and $14.7 million for the nine months endedSeptember 30, 2016 and 2015, respectively.

As of September 30, 2016, 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, 2016

Debt Disclosure [Abstract]

Debt

Debt

Debt consisted of the following as of September 30, 2016 and December 31, 2015 (amounts in thousands):

							As of September 30, 2016
	Principal Balance as of September 30, 2016			Principal Balance as of December 31, 2015			Stated Rate		Effective Rate(1)		Maturity Date(2)
Mortgage debt collateralized by:
Fixed rate mortgage debt
10 Bank Street	$	31,715		$	32,214		5.72	%	6.22	%	6/1/2017
1542 Third Avenue	17,906			18,222			5.90	%	6.61	%	6/1/2017
First Stamford Place	236,030			238,765			5.65	%	6.17	%	7/5/2017
1010 Third Avenue and 77 West 55th Street	26,646			27,064			5.69	%	6.39	%	7/5/2017
383 Main Avenue	28,811			29,269			5.59	%	6.04	%	7/5/2017
1333 Broadway	67,909			68,646			6.32	%	3.76	%	1/5/2018
1400 Broadway
(first lien mortgage loan)	67,974			68,732			6.12	%	3.41	%	2/5/2018
(second lien mortgage loan)	9,442			9,600			3.35	%	3.36	%	2/5/2018
112 West 34th Street
(first lien mortgage loan)	75,554			76,406			6.01	%	3.36	%	4/5/2018
(second lien mortgage loan)	9,543			9,640			6.56	%	3.67	%	4/5/2018
1350 Broadway	37,913			38,348			5.87	%	3.74	%	4/5/2018
Metro Center	96,483			97,950			3.59	%	3.66	%	11/5/2024
10 Union Square (3)	50,000			20,289			3.70	%	4.00	%	4/1/2026
Total mortgage debt	755,926			735,145
Senior unsecured notes - exchangeable	250,000			250,000			2.63	%	3.93	%	8/15/2019
Senior unsecured notes:
Series A	100,000			100,000			3.93	%	4.02	%	3/27/2025
Series B	125,000			125,000			4.09	%	4.18	%	3/27/2027
Series C	125,000			125,000			4.18	%	4.27	%	3/27/2030
Unsecured revolving credit facility	—			40,000			(4)		(4)		1/23/2019
Unsecured term loan facility	265,000			265,000			(5)		(5)		8/24/2022
Total principal	1,620,926			1,640,145
Unamortized premiums, net of unamortized discount	1,974			5,181
Deferred financing costs, net	(7,067		)	(12,910		)
Total	$	1,615,833		$	1,632,416

______________

(1) The effective rate is the yield as of September 30, 2016, 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) The mortgage loan collateralized by 10 Union Square was refinanced in March 2016.

(4) At September 30, 2016, the unsecured revolving credit facility bears a floating rate at 30 day LIBOR plus 1.15%. The rate at September 30, 2016 was 1.68%.

(5) The unsecured term loan facility bears a floating rate at 30 day LIBOR plus 1.60%. The rate at September 30, 2016 was 2.13%. 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.

Principal Payments

Aggregate required principal payments at September 30, 2016 are as follows (amounts in thousands):

Year	Amortization		Maturities		Total
2016	$	3,086	$	—	$	3,086
2017	9,904		336,009		345,913
2018	2,880		262,210		265,090
2019	2,188		250,000		252,188
2020	2,268		—		2,268
Thereafter	9,706		742,675		752,381
Total	$	30,032	$	1,590,894	$	1,620,926

Deferred Financing Costs

Deferred financing costs, net, consisted of the following at September 30, 2016 and December 31, 2015 (amounts in thousands):

	September 30, 2016			December 31, 2015
Financing costs	$	23,044		$	20,882
Less: accumulated amortization	(10,949		)	(7,972		)
Total deferred financing costs, net	$	12,095		$	12,910

Amortization expense related to deferred financing costs was $1.3 million and $1.1 million for the three months ended September 30, 2016 and 2015, respectively, and $3.7 million and $5.0 million for the nine months endedSeptember 30, 2016 and 2015, respectively, and was included in interest expense. At September 30, 2016, $5.0 million of net deferred financing costs associated with the unsecured revolving credit facility was included in deferred costs, net on the condensed consolidated balance sheet.

Unsecured Revolving Credit Facility

On January 23, 2015, we entered into an unsecured revolving credit agreement, which is referred to herein as the “unsecured revolving credit facility,” with Bank of America, Merrill Lynch, Goldman Sachs and the other lenders party thereto. Merrill Lynch acted as joint lead arranger; Bank of America acted as administrative agent; and Goldman Sachs acted as syndication agent and joint lead arranger.

Concurrently with entering into the unsecured revolving credit facility, on January 23, 2015, we terminated our secured revolving and term credit facility and wrote off $1.3 million of deferred financing costs. In connection with the termination of the secured revolving and term credit facility, all of the guarantors thereunder were released from their guaranty obligations, all liens created thereby were terminated, and all collateral pledged thereunder was released.

The unsecured revolving credit facility is comprised of a revolving credit facility in the maximum original principal amount of $800.0 million. The unsecured revolving credit facility contains an accordion feature that would allow us to increase the maximum aggregate principal amount to $1.25 billion under specified circumstances. On July 6, 2016, we partially exercised the accordion feature and increased our committed borrowing capacity under the unsecured revolving credit facility from $800 million to $1.1 billion.

Amounts outstanding under the unsecured revolving credit facility bear interest at a floating rate equal to, at our election, (x) a Eurodollar rate, plus a spread that ranges from 0.875% to 1.600% depending upon our leverage ratio and credit rating; or (y) a base rate, plus a spread that ranges from 0.000% to 0.600% depending upon our leverage ratio and credit rating. In addition, the unsecured revolving credit facility permits us to borrow at competitive bid rates determined in accordance with procedures described in the unsecured revolving credit facility agreement. We paid certain customary fees and expense reimbursements to enter into the unsecured revolving credit facility.

The initial maturity of the unsecured revolving credit facility is January 2019. 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 0.075% of the then outstanding commitments under the unsecured revolving credit facility.

The unsecured revolving credit facility includes the following financial covenants: (i) maximum leverage ratio of total indebtedness to total asset value 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 $745.4 million plus 75% of net equity proceeds received by us (other than proceeds received within ninety (90) days after the redemption, retirement or repurchase of ownership or equity interests in us up to the amount paid by us in connection with such redemption, retirement or repurchase, where, the net effect is that we shall not have increased our 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, (vi) the ratio of total unsecured indebtedness to unencumbered asset value will not exceed 60%, and (vii) consolidated secured recourse indebtedness will not exceed 10% of total asset value (provided, however, this covenant shall not apply at any time after we achieve debt ratings from at least two of Moody’s, S&P and Fitch, and such debt ratings are Baa3 or better (in the case of a rating by Moody’s) or BBB- or better (in the case of a rating by S&P or Fitch)).

The unsecured revolving credit facility contains customary covenants, including limitations on liens, investment, 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).

As of September 30, 2016, we were in compliance with the covenants under the unsecured revolving credit facility. 

Senior Unsecured Notes

Exchangeable Senior Notes

During August 2014, we issued $250.0 million principal amount of 2.625% Exchangeable Senior Notes (“2.625% Exchangeable Senior Notes”) due August 15, 2019. These 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 our intent and ability to settle the principal amount of the 2.625% Exchangeable Senior Notes is in cash. As of September 30, 2016, the exchange rate of the 2.625% Exchangeable Senior Notes was 51.5095 shares per $1,000 principal amount of notes (equivalent to an initial exchange price of approximately $19.41 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, 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. For the three and nine months endedSeptember 30, 2015, 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.

Series A, Series B, and Series C Senior Notes

During March 2015, we issued and sold an aggregate principal amount of $350 million senior unsecured notes consisting of $100 million of 3.93% Series A Senior Notes due 2025, $125 million of 4.09% Series B Senior Notes due 2027, and $125 million of 4.18% Series C Senior Notes due 2030 (together, the “Series A, B and C Senior Notes”). Interest on the Series A, B and C Senior Notes is payable quarterly.

The terms of the Series A, B and C Senior Notes agreement include customary covenants, including limitations on liens, investment, debt, fundamental changes, and transactions with affiliates and require certain customary financial reports. The Series A, B and C Senior Notes also require compliance with financial ratios consistent with our unsecured revolving credit facility including a maximum leverage ratio, a maximum secured leverage ratio, a minimum amount of tangible net worth, a minimum fixed charge coverage ratio, a minimum unencumbered interest coverage ratio, a maximum unsecured leverage ratio and a maximum amount of secured recourse indebtedness.

The proceeds from the issuance of the Series A, B and C Senior Notes were used to repay outstanding mortgage debt, reduce amounts outstanding under the unsecured revolving credit facility and for other general corporate purposes. As of September 30, 2016, we were in compliance with the covenants under the Series A, B and C Senior Notes. 

Senior Unsecured Term Loan Facility

During August 2015, we entered into a $265.0 million senior unsecured term loan facility, which is referred to herein as the “term loan facility” with Wells Fargo Bank, National Association, as administrative agent, Capital One, National Association, as syndication agent, PNC Bank, National Association, as documentation agent, and the lenders from time to time party thereto.

Amounts outstanding under the term loan facility bear interest at a floating rate equal to, at our election, (x) a LIBOR rate, plus a spread that ranges from 1.400% to 2.350% depending upon our leverage ratio and credit rating; or (y) a base rate, plus a spread that ranges from 0.400% to 1.350% depending upon our leverage ratio and credit rating. Pursuant to a forward interest rate swap agreement, we effectively fixed LIBOR at 2.1485% for $265.0 million of the term loan facility for the period beginning on August 31, 2017 through maturity. In connection with the closing of the term loan facility, we paid certain customary fees and expense reimbursements.

The term loan facility matures on August 24, 2022. We may prepay loans under the term loan facility at any time, subject to certain notice requirements. To the extent that we prepay all or any portion of a loan on or prior to August 24, 2017, we will pay a prepayment premium equal to (i) if such prepayment occurs on or prior to August 24, 2016, 2.00% of the principal amount so prepaid, and (ii) if such prepayment occurs after August 24, 2016 but on or prior to August 24, 2017, 1.00% of the principal amount so prepaid.

The terms of the term loan facility agreement include customary covenants, including limitations on liens, investment, debt, fundamental changes, and transactions with affiliates and require certain customary financial reports. The term loan facility requires compliance with financial ratios including a maximum leverage ratio, a maximum secured leverage ratio, a minimum amount of tangible net worth, a minimum fixed charge coverage ratio, a minimum unencumbered interest coverage ratio, a maximum unsecured leverage ratio and a maximum amount of secured recourse indebtedness. It also contains customary events of default (subject in certain cases to specified cure periods). These terms in the term loan facility agreement are consistent with the terms in our unsecured revolving credit facility agreement.

The proceeds from the term loan facility were used to repay borrowings made under the unsecured revolving credit facility. As of September 30, 2016, we were in compliance with the covenants under the term loan facility.

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Accounts Payable and Accrued Expenses

9 Months Ended

Sep. 30, 2016

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, 2016 and December 31, 2015 (amounts in thousands):

	September 30, 2016		December 31, 2015
Accounts payable and accrued expenses	$	99,522	$	83,352
Payable to the estate of Leona M. Helmsley (1)	18,367		18,367
Interest rate swap agreements liability	31,227		1,922
Accrued interest payable	4,426		5,555
Due to affiliated companies	1,031		1,903
Accounts payable and accrued expenses	$	154,573	$	111,099

___________

(1) Reflects a payable to the estate of Leona M. Helmsley in the amount of New York City transfer taxes which would have been payable in absence of the estate's exemption from such tax.

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Financial Instruments and Fair Values

9 Months Ended

Sep. 30, 2016

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, 2016, 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 $31.8 million. If we had breached any of these provisions at September 30, 2016, we could have been required to settle our obligations under the agreements at their termination value of $31.8 million.

As of September 30, 2016, we had three interest rate LIBOR swaps with an aggregate notional value of $465.0 million. The notional value does not represent exposure to credit, interest rate or market risks. The fair value of these derivative instruments, which is included in accounts payable and accrued expenses on the condensed consolidated balance sheet, amounted to $31.2 million at September 30, 2016. 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, 2016, these cash flow hedges are deemed effective and an unrealized gain of $0.9 million and an unrealized loss of $29.3 million are reflected in the condensed consolidated statements of comprehensive income for the three and nine months ended September 30, 2016, respectively. Amounts reported in accumulated other comprehensive income related to derivatives will be reclassified to interest expense as interest payments are made on the debt. We estimate that $1.2 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, 2016.

The table below summarizes the terms of agreements and the fair values of our derivative financial instruments as of September 30, 2016 and December 31, 2015 (dollar amounts in thousands):     

	As of September 30, 2016						September 30, 2016					December 31, 2015
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	$	—	$	(12,921	)	$	—	$	(1,620	)
Interest rate swap	100,000		3 Month LIBOR	2.5050%	July 5, 2017	July 5, 2027	—		(9,153		)	—		(148		)
Interest rate swap	100,000		3 Month LIBOR	2.5050%	July 5, 2017	July 5, 2027	—		(9,153		)	—		(154		)
							$	—	$	(31,227	)	$	—	$	(1,922	)

The table below shows the effect of our derivative financial instruments designated as cash flow hedges for the three and nine months endedSeptember 30, 2016 and 2015 (amounts in thousands):    

Effects of Cash Flow Hedges	Three Months Ended September 30, 2016		Three Months Ended September 30, 2015			Nine Months Ended September 30, 2016			Nine Months Ended September 30, 2015
Amount of gain (loss) recognized in other comprehensive income (loss) - effective portion	$	930	$	(4,384	)	$	(29,305	)	$	(4,384	)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense - effective portion	—		—			—			—
Amount of gain (loss) recognized in other income/expense - ineffective portion	—		—			—			—

Fair Valuation

The estimated fair values at September 30, 2016 and December 31, 2015 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 is classified as Level 1 and was derived from quoted prices in active markets. However, the fair value could be classified as Level 2 if trading volumes are low.

The fair value of derivative instruments, which is classified as Level 2, and measured on a recurring basis, is determined using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. The fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments) and the discounted expected variable cash payments (or receipts). The variable cash payments (or receipts) are based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves.

The fair value of borrowings, which is classified as Level 3, is estimated by discounting the contractual cash flows of each debt to their present value using adjusted market interest rates, which is provided by a third-party specialist.

The following tables summarize the carrying and estimated fair values of our financial instruments as of September 30, 2016 and December 31, 2015 (amounts in thousands):

	September 30, 2016
			Estimated Fair Value
	Carrying Value		Total		Level 1		Level 2		Level 3
Interest rate swaps included in accounts payable and accrued expenses	$	31,227	$	31,227	$	—	$	31,227	$	—
Mortgage notes payable	763,457		770,827		—		—		770,827
Senior unsecured notes - Exchangeable	240,658		290,325		290,325		—		—
Senior unsecured notes - Series A, B, and C	348,888		364,574		—		—		364,574
Unsecured term loan facility	262,830		265,000		—		—		265,000
Unsecured revolving credit facility	—		—		—		—		—

	December 31, 2015
			Estimated Fair Value
	Carrying Value		Total		Level 1		Level 2		Level 3
Interest rate swaps included in accounts payable and accrued expenses	$	1,922	$	1,922	$	—	$	1,922	$	—
Mortgage notes payable	747,661		752,350		—		—		752,350
Senior unsecured notes - Exchangeable	238,208		251,391		—		—		251,391
Senior unsecured notes - Series A, B, and C	348,810		344,501		—		—		344,501
Unsecured term loan facility	262,545		265,000		—		—		265,000
Unsecured revolving credit facility	35,192		40,000		—		—		40,000

Disclosure about fair value of financial instruments is based on pertinent information available to us as of September 30, 2016 and December 31, 2015. Although we are not aware of any factors that would significantly affect the reasonableness of these 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, 2016

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, 2016

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Legal Proceedings

Except as described below, as of September 30, 2016, 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.

In March 2012, five putative class actions, or the "Original Class Actions," were filed in New York State Supreme Court, New York County by investors in certain of the existing entities (constituting the predecessor and the non-controlled entities) (the "Existing Entities") on March 1, 2012, March 7, 2012, March 12, 2012, March 14, 2012 and March 19, 2012. The plaintiffs asserted claims against our predecessor’s management companies, Anthony E. Malkin, Peter L. Malkin, the estate of Leona M. Helmsley, ESRT and us for breach of fiduciary duty, unjust enrichment and/or aiding and abetting breach of fiduciary duty. They alleged, among other things, that the terms of the consolidation and the process by which it was structured (including the valuation that was employed) are unfair to the investors in the Existing Entities, the consolidation provides excessive benefits to Malkin Holdings LLC (now our subsidiary) and its affiliates and the then-draft prospectus/consent solicitation with respect to the consolidation filed with the SEC failed to make adequate disclosure to permit a fully-informed decision about the consolidation. The complaints sought money damages and injunctive relief preventing the consolidation. The Original Class Actions were consolidated and co-lead plaintiffs’ counsel were appointed by the New York State Supreme Court by order dated June 26, 2012. Further, an underlying premise of the Original Class Actions, as noted in discussions among plaintiffs' counsel and defendants' counsel, was that the consolidation had been structured in such a manner that would cause investors in Empire State Building Associates L.L.C., 60 East 42nd St. Associates L.L.C. and 250 West 57th St. Associates L.L.C. (the “subject LLCs”) immediately to incur substantial tax liabilities.

The parties entered into a Stipulation of Settlement dated September 28, 2012, resolving the Original Class Actions. The Stipulation of Settlement recites that the consolidation was approved by overwhelming consent of the investors in the Existing Entities. The Stipulation of Settlement states that counsel for the plaintiff class satisfied themselves that they have received adequate access to relevant information, including the independent valuer's valuation process and methodology, that the disclosures in the Registration Statement on Form S-4, as amended, are appropriate, that the consolidation presents potential benefits, including the opportunity for liquidity and capital appreciation, that merit the investors' serious consideration and that each of the named class representatives intends to support the consolidation as modified. The Stipulation of Settlement further states that counsel for the plaintiff class are satisfied that the claims regarding tax implications, enhanced disclosures, appraisals and exchange values of the properties that would be consolidated into our company, and the interests of the investors in the Existing Entities, have been addressed adequately, and they have concluded that the settlement pursuant to the Stipulation of Settlement and opportunity to consider the proposed consolidation on the basis of revised consent solicitations are fair, reasonable, adequate and in the best interests of the plaintiff class.

The defendants in the Stipulation of Settlement denied that they committed any violation of law or breached any of their duties and did not admit that they had any liability to the plaintiffs.

The terms of the settlement include, among other things (i) a payment of $55.0 million, with a minimum of 80% in cash and maximum of 20% in freely-tradable shares of ESRT common stock and/or freely-tradable operating partnership units to be distributed, after reimbursement of plaintiffs' counsel's court-approved expenses and payment of plaintiffs' counsel's court-approved attorneys' fees (which are included within the $55.0 million settlement payment) and, in the case of shares of ESRT common stock and/or operating partnership units, after the termination of specified lock-up periods, to investors in the Existing Entities pursuant to a plan of allocation to be prepared by counsel for plaintiffs; (ii) defendants' agreement that (a) the Offering would be on the basis of a firm commitment underwriting; (b) if, during the solicitation period, any of the three subject LLCs' percentage of total exchange value is lower than what was stated in the final prospectus/consent solicitation with respect to the consolidation by 10% or more, such decrease would be promptly disclosed by defendants to investors in the subject LLCs; and (c) unless total gross proceeds of $600.0 million are raised in the Offering, defendants will not proceed with the consolidation without further approval of the subject LLCs; and (iii) defendants' agreement to make additional disclosures in the prospectus/consent solicitation with respect to the consolidation regarding certain matters (which are included therein). Investors in the Existing Entities will not be required to bear any portion of the settlement payment. The payment in settlement of the Original Class Actions will be made by the estate of Leona M. Helmsley and affiliates of Malkin Holdings LLC (provided that none of Malkin Holdings LLC's affiliates that would become our direct or indirect subsidiary in the consolidation will have any liability for such payment) and certain investors in the Existing Entities who agree to contribute. We will not bear any of the settlement payment.

The settlement further provides for the certification of a class of investors in the Existing Entities, other than defendants and other related persons and entities, and a release of any claims of the members of the class against the defendants and related persons and entities, as well as underwriters and other advisors. The release in the settlement excludes certain claims, including but not limited to, claims arising from or related to any supplement to the Registration Statement on Form S-4 that is declared effective to which the plaintiffs' counsel objects in writing, which objection will not be unreasonably made or delayed, so long as plaintiffs' counsel has had adequate opportunity to review such supplement. There was no such supplement that plaintiff's counsel objected to in writing. The settlement was subject to court approval. It was not effective until such court approval is final, including the resolution of any appeal. Defendants continue to deny any wrongdoing or liability in connection with the allegations in the Original Class Actions.

On January 18, 2013, the parties jointly moved for preliminary approval of the settlement, for permission to send notice of the settlement to the class, and for the scheduling of a final settlement hearing. On January 28, 2013, six of the investors in Empire State Building Associates L.L.C. filed an objection to preliminary approval, and cross-moved to intervene in the Original Class Actions and for permission to file a separate complaint on behalf of the investors in Empire State Building Associates L.L.C. On February 21, 2013, the court denied the cross motion of such objecting investors, and the court denied permission for such objecting investors to file a separate complaint as part of the Original Class Actions, but permitted them to file a brief solely to support their allegation that the buyout would deprive non-consenting investors in Empire State Building Associates L.L.C. of “fair value” in violation of the New York Limited Liability Company Law. The court rejected the objecting investors’ assertion that preliminary approval be denied and granted preliminary approval of the settlement.

Pursuant to a decision issued on April 30, 2013, the court rejected the allegation regarding the New York Limited Liability Company Law and ruled in Malkin Holdings LLC’s favor, holding that such buyout provisions are legally binding and enforceable and that investors do not have the rights they claimed under the New York Limited Liability Company Law.

On May 2, 2013, the court held a hearing regarding final approval of the Original Class Actions settlement, at the conclusion of which the court stated that it intended to approve the settlement. On May 17, 2013, the court issued its Opinion and Order. The court rejected the objections by all objectors and upheld the settlement in its entirety. Of the approximately 4,500 class members who are investors in all of the Existing Entities included in the consolidation, 12 opted out of the settlement. Those who opted out will not receive any share of the settlement proceeds, but can pursue separate claims for monetary damages.

Also on May 17, 2013, the court issued its Opinion and Order on attorneys’ fees. Class counsel applied for an award of $15.0 million in fees and $295,895 in expenses, which the court reduced to $11.59 million in fees and $265,282 in expenses (which are included within the $55.0 million settlement payment).

The investors who challenged the buyout provision filed a notice of appeal of the court’s April 30, 2013 decision and moved before the appellate court for a stay of all proceedings relating to the settlement, including such a stay as immediate interim relief. On May 1, 2013, their request for immediate interim relief was denied. On May 13, 2013, Malkin Holdings LLC filed its brief in opposition to the motion for the stay. On June 18, 2013, the appellate court denied the motion for the stay. On July 16, 2013, these investors filed their brief and other supporting papers on their appeal of the April 30, 2013 decision, which are required to perfect the appeal. On September 4, 2013, Malkin Holdings LLC filed its brief on the appeal, and also moved to dismiss the appeal on the grounds that these investors lack standing to pursue it. Malkin Holdings LLC contended that these investors were not entitled to appraisal under the New York Limited Liability Company Law because, among other reasons (i) they are not members of Empire State Building Associates L.L.C., and only members have such rights; (ii) the transaction in question is not a merger or consolidation as defined by statute, and appraisal only applies in those transactions; and (iii) when Empire State Building Associates L.L.C. was converted into a limited liability company, the parties agreed that no appraisal would apply. Moreover, Malkin Holdings LLC contended that only the 12 investors who opted out of the class action settlement could pursue appraisal, because that settlement contains a broad release of (and there is an associated bar order from the court preventing) any such claims. Malkin Holdings LLC further noted that of the six investors attempting to pursue the appeal, only two had in fact opted out of the class action settlement. On September 13, 2013, these investors filed their reply brief on the appeal, and opposed the motion to dismiss. On September 19, 2013, Malkin Holdings LLC filed its reply brief on the motion to dismiss. On October 3, 2013, the appeals court denied the motion to dismiss without prejudice to address the matter directly on the appeal, effectively referring the issues raised in the motion to the panel that was to hear the appeal itself. The appeals court heard argument on November 21, 2013, and in a Decision and Order dated February 25, 2014, it affirmed the trial court’s ruling.

In addition, on June 20, 2013, these same investors, and one additional investor who also opposed the settlement of the Original Class Action, filed additional notices of appeal from the trial court’s rulings in the Original Class Actions. These notices of appeal related to (i) the order entered February 22, 2013 granting preliminary approval of the Original Class Action settlement and setting a hearing for final approval; (ii) the order entered February 26, 2013, refusing to sign a proposed order to show cause for a preliminary injunction regarding the consolidation; (iii) an order entered April 2, 2013, denying the motion to intervene and to file a separate class action on behalf of Empire State Building Associates L.L.C. investors; (iv) the order entered April 10, 2013, refusing to sign the order to show cause seeking to extend the deadline for class members to opt out of the Original Class Action settlement; (v) the Final Judgment and Order entered May 17, 2013; (vi) the order entered May 17, 2013 approving the Original Class Action settlement; and (vii) the order entered May 17, 2013 awarding class counsel attorneys’ fees and costs. On January 6, 2014, Class counsel moved to dismiss these additional appeals on the grounds that they were not timely perfected by filing an appellate brief and record. On February 6, 2014, the appeals court granted the motion unless the appeals were perfected by March 17, 2014.

On March 27, 2014, the investors who challenged the buyout provision moved in the appellate court for re-argument or in the alternative for leave to appeal the appeals court’s ruling to the New York Court of Appeals. Opposition to the motion was filed on April 7, 2014. The appellate court denied the motion on May 22, 2014. The investors moved in the New York Court of Appeals for leave to appeal on June 26, 2014. Opposition to this motion was filed on July 11, 2014 and the court dismissed the motion by order dated September 18, 2014. On October 20, 2014, the investors moved to re-argue that dismissal. That motion was denied on December 17, 2014, and counsel for these investors has represented that the investors do not intend to pursue further appellate review of the court’s April 30, 2013 ruling rejecting the challenge to the buyout provision. On March 3, 2015, plaintiffs' counsel filed a motion with the court for its approval of distribution of the net settlement fund. In that motion plaintiffs' counsel also asked for additional fees and expenses to be paid out of the fund. On March 20, 2015, Malkin Holdings LLC filed a response to that motion in which it supported distribution of the fund and took no position on additional fees and expenses. No opposition to the motion was filed and the court granted the motion. Substantially all of the net settlement fund has been distributed to the class, but a small amount remains outstanding.

On March 14, 2014, one of the investors who had filed a notice of appeal from the trial court’s rulings in the Original Class Actions noted above perfected an appeal from the court’s May 17, 2013 Final Judgment and Order and orders approving the Original Class Action Settlement and awarding class counsel attorneys’ fees and costs. By stipulation of all counsel to the appeal dated September 12, 2014, the appeal was dismissed with prejudice. No other appeals were filed by the March 17, 2014 deadline set by the appeals court in its February 6, 2014 order. The Original Class Actions Settlement is final and non-appealable.

In addition, commencing December 24, 2013, four putative class actions, or the "Second Class Actions," were filed in New York State Supreme Court, New York County, against Malkin Holdings LLC, Peter L. Malkin, Anthony E. Malkin and Thomas N. Keltner, Jr. on behalf of former investors in Empire State Building Associates L.L.C. Generally, the Second Class Actions alleged that the defendants breached their fiduciary duties and were unjustly enriched. One of the Second Class Actions named us and ESRT as defendants, alleging that they aided and abetted the breaches of fiduciary duty. The Second Class Actions were consolidated on consent, and co-lead class counsel was appointed by order dated February 11, 2014. A Consolidated Amended Complaint was filed February 7, 2014, which did not name us or ESRT as defendants. It seeks monetary damages. On March 7, 2014, defendants filed a motion to dismiss the Second Class Actions, which the plaintiffs opposed and was fully submitted to the court on April 28, 2014. The court heard oral arguments on the motion on July 7, 2014, and the motion to dismiss was granted in a ruling entered July 21, 2014. The plaintiffs filed a notice of appeal on August 8, 2014. On January 12, 2015, the plaintiffs filed a motion to supplement the record on appeal to include additional materials from the Original Class Action, which the defendants opposed. The motion was denied on March 5, 2015. The plaintiffs perfected this appeal by filing their brief and the appellate record with the court on March 23, 2015. Oral argument on the appeal was held on October 28, 2015. On November 25, 2015, the appellate court affirmed dismissal of the Second Class Actions. The plaintiffs moved the appellate court for leave to appeal to the New York Court of Appeals. On March 1, 2016, the appellate court denied the motion. On March 31, 2016, the plaintiffs moved for leave to appeal in the New York Court of Appeals, which the Court of Appeals denied on June 9, 2016. The time for any further appeal of this dismissal has now expired.

On or about October 14, 2014, the 12 investors (out of approximately 4,500 investors covered by the Original Class Actions) who opted out of the Original Class Actions filed an arbitration with the American Arbitration Association against Peter L. Malkin, Anthony E. Malkin, Thomas N. Keltner, Jr., and Malkin Holdings LLC, as respondents, alleging breach of fiduciary duty and related claims in connection with the consolidation. The statement of claim in that 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 plan 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 May 24, 2016 and proceeded for several days. The hearings are scheduled to resume December 19, 2016.

As with the prior claims challenging the consolidation and related matters, the defendants believe the allegations in the arbitration are entirely without merit, and they intend to defend 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 Second Class Actions and the above-referenced arbitration.

Additionally, there is a risk that other third parties will assert claims against us, Malkin Holdings LLC, or any other party entitled to defense and indemnity from us, including, without limitation, claims that Malkin Holdings LLC breached its fiduciary duties to investors in the Existing Entities or that the consolidation violates the relevant operating agreements, and third parties may commence litigation related to such claims. As a result, we may incur costs associated with defending or settling such litigation or paying any judgment if we lose.

Unfunded Capital Expenditures

At September 30, 2016, we estimate that we will incur approximately $57.1 million of capital expenditures for tenant improvements and leasing commissions on our consolidated properties pursuant to existing lease agreements. We expect to fund these capital expenditures with operating cash flow, additional property level mortgage financings, our unsecured revolving credit facility, other issuances of debt, and cash on hand. 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, 2016 are as follows (amounts in thousands):

2016	$	380
2017	1,518
2018	1,518
2019	1,518
2020	1,518
Thereafter	56,730
	$	63,182

Concentration of Credit Risk

Financial instruments that subject us to credit risk consist primarily of cash, restricted cash, tenant and other receivables and deferred rent receivables. At September 30, 2016, 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, 2016, 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, 2016, our 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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Capital

9 Months Ended

Sep. 30, 2016

Stockholders' Equity Note Disclosure, Disclosure of Compensation Related Costs, Share-based Payments and Earnings Per Share [Abstract]

Capital

Capital

On August 23, 2016, an affiliate of Qatar Investment Authority (“QIA”) purchased 29,610,854 newly issued ESRT Class A common shares at $21.00 per share, resulting in gross proceeds of $621.8 million. The proceeds were contributed to us and we issued 29,610,854 Series PR units to ESRT. At August 23, 2016, the 29,610,854 units were equivalent to a 9.9% economic interest in us. QIA has a top-up right to maintain their ownership stake at 9.9% over time.

In connection with the share issuance to QIA, ESRT 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 ESRT pays that are attributable to capital gains from the sale or exchange of any U.S. real property interests. If ESRT were to trigger its tax indemnification obligations under this agreement, we and ESRT would be required to pay QIA for the resulting tax consequences, as applicable.

As of September 30, 2016, there were 299,099,533 operating partnership units outstanding, of which 154,925,644, or 51.8%, were owned by ESRT and 144,173,889, or 48.2%, were owned by other partners, including ESRT directors, members of senior management and other employees.

Long-term incentive plan ("LTIP") units are a special class of partnership interests. Each LTIP unit awarded will be deemed equivalent to an award of one share of ESRT 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, we 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 unitholders. Subject to any agreed upon exceptions, once vested and having achieved parity with unitholders, LTIP units are convertible into Series PR operating partnership units on a one-for-one basis.     

With the exception of performance based LTIP units granted in 2016, all LTIP units issued in connection with annual

equity awards, whether vested or not, receive the same per unit distributions as operating partnership units, which equal

per share dividends (both regular and special) on our common stock. Performance based LTIP units granted in 2016 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.

Distributions

Total distributions paid to OP unitholders were $31.4 million and $82.6 million for the three and nine months ended September 30, 2016, respectively, and $22.7 million and $68.2 million for the three and nine months ended September 30, 2015, respectively. Total distributions paid to preferred unitholders were $0.2 million and $0.7 million for the three and nine months ended September 30, 2016, respectively, and $0.2 million and $0.7 million for the three and nine months ended September 30, 2015, 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 ESRT common stock is authorized for issuance under awards granted pursuant to the 2013 Plan, and as of September 30, 2016, 8.3 million shares of ESRT common stock remain available for future issuance.

In January 2015, we made a grant of LTIP units to an employee under the 2013 Plan. We granted a total of 9,531 LTIP units with a fair market value of $0.2 million. The award is subject to time-based vesting and all LTIP units vest on April 1, 2020, subject generally to the grantee's continued employment.

In February 2015, we made grants of LTIP units to executive officers under the 2013 Plan. At such time, we granted a total of 168,033 LTIP units that are subject to time-based vesting and 154,266 LTIP units that are subject to performance-based vesting, with fair market values of $2.9 million for the time-based vesting awards and $1.3 million for the performance-based vesting awards. The awards subject to time-based vesting vest ratably over four years from January 1, 2015, subject generally to the grantee's continued employment. The first installment vests on the first-year anniversary date of January 1, 2015 and the remainder will vest thereafter in three equal annual installments. The vesting of the awards 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, 2015. 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, 2018 and the second installment vesting on January 1, 2019, subject generally to the grantee's continued employment on those dates.

In February 2015, we made grants of LTIP units and ESRT restricted stock to certain other employees under the 2013 Plan. At such time, we granted a total of 33,398 LTIP units and 14,315 shares of ESRT restricted stock that are subject to time-based vesting and 33,398 LTIP units and 14,315 shares of ESRT restricted stock that are subject to performance-based vesting, with fair market values of $0.8 million for the time-based vesting awards and $0.4 million for the performance-based vesting awards. The awards subject to time-based vesting vest ratably over four years from January 1, 2015, subject generally to the grantee's continued employment. The first installment vests on the first-year anniversary date of January 1, 2015 and the remainder will vest thereafter in three equal annual installments. The vesting of the awards 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, 2015. Following the completion of the three -year performance period, our compensation committee will determine the number of LTIP units or ESRT shares to which the grantee is entitled based on our performance relative to the performance hurdles set forth in the award agreements the grantee entered into in connection with the award grant. These units and ESRT shares then vest in two installments, with the first installment vesting on January 1, 2018 and the second installment vesting on January 1, 2019, subject generally to the grantee's continued employment on those dates. We issued operating partnership units to ESRT for each share of restricted stock issued by ESRT.

In February 2015, we made a grant of LTIP units to an executive officer under the 2013 Plan. At such time, we granted a total of 13,736 LTIP units that are subject to time-based vesting and 13,736 LTIP units that are subject to performance-based vesting, with fair market values of $0.2 million for the time-based vesting awards and $0.1 million for the performance-based vesting awards. The awards subject to time-based vesting vest ratably over four years from the date of the grant, subject generally to the grantee's continued employment. The first installment vests on the first-year anniversary date of the grant 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 February 1, 2015. 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 February 1, 2018 and the second installment vesting on February 1, 2019, subject generally to the grantee's continued employment on those dates.

In June 2015, we made grants of LTIP units to our non-employee directors under the 2013 Plan. At such time, we granted a total of 35,082 LTIP units that are subject to time-based vesting, with fair market values of $0.6 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 2015 with fair market values of less than $0.1 million in the aggregate.

In February 2016, we made grants of LTIP units to executive officers under the 2013 Plan. At such time, we granted 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. 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 vests 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 February 2016, we made grants of LTIP units and restricted stock to certain other employees under the 2013 Plan. At such time, we granted 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 vests on January 1, 2017 and the remainder will vest thereafter in three equal annual installments. The vesting of the awards 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 award agreements the grantee entered into in connection with the award grant. These units and shares 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 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 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 units and restricted stock grants that are time-vesting, we estimate the stock compensation expense based on the fair value of the stock at the grant date.

Share-based compensation expense has been adjusted by an amount of estimated forfeitures. Forfeitures are estimated based on historical experience at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. Based on an analysis of historical data, we have calculated a 0% annual forfeiture rate for members of the Board of Directors, a 0% annual forfeiture rate for executive officers, and for all other employees a 5% annual forfeiture rate. We reevaluate this analysis periodically and adjust these estimated forfeiture rates as necessary. To the extent actual results or updated estimates differ from our current estimates, such amounts will be recorded as a cumulative adjustment in the period estimates are revised.

LTIP units and ESRT restricted stock issued during the nine months endedSeptember 30, 2016 were valued at $18.4 million. The weighted-average per unit or share fair value was $9.60 for grants issued in 2016. 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 2016.

The following is a summary of ESRT restricted stock and LTIP unit activity for the nine months endedSeptember 30, 2016:

	Restricted Stock		LTIP Units		Weighted Average Grant Fair Value
Unvested balance at December 31, 2015	97,592		1,415,895		$	11.04
Vested	(4,350	)	(124,843	)	15.89
Granted	47,071		1,868,629		9.58
Forfeited	(278	)	—		17.97
Unvested balance at September 30, 2016	140,035		3,159,681		$	10.00

The LTIP unit and ESRT 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 $0.1 million and $0.6 million for the three and nine months endedSeptember 30, 2016, respectively, and $0.0 million and $0.5 million for the three and nine months ended September 30, 2015, respectively. Unrecognized compensation expense was $0.5 million at September 30, 2016, which will be recognized over a period of 2.2 years.

For the remainder of the LTIP unit and ESRT restricted stock awards, we recognize noncash compensation expense ratably over the vesting period, and accordingly, we recognized noncash compensation expense of $2.5 million and $6.7 million for the three and nine months endedSeptember 30, 2016, respectively and $1.4 million and $3.8 million for the three and nine months ended September 30, 2015, respectively. Unrecognized compensation expense was $21.0 million at September 30, 2016, which will be recognized over a weighted average period of 2.6 years.

Earnings Per Unit

Earnings per unit for the three and nine months ended September 30, 2016 and 2015 is computed as follows (amounts in thousands, except per unit amounts):

	Three Months Ended,						Nine Months Ended,
	September 30, 2016			September 30, 2015			September 30, 2016			September 30, 2015
Numerator:
Net income	$	32,897		$	26,085		$	74,242		$	60,558
Private perpetual preferred unit distributions	(234		)	(234		)	(702		)	(702		)
Earnings allocated to unvested units	(225		)	(161		)	(575		)	(425		)
Net income attributable to common unitholders - basic and diluted	$	32,438		$	25,690		$	72,965		$	59,431
Denominator:
Weighted average units outstanding - basic	278,739			265,873			270,388			265,868
Effect of dilutive securities:
Stock-based compensation plans	1,090			—			378			—
Exchangeable senior notes	785			—			262			—
Weighted average units outstanding - diluted	280,614			265,873			271,028			265,868
Earnings per unit - basic and diluted	$	0.12		$	0.10		$	0.27		$	0.22

There were 1,033,044 and 757,119 antidilutive units for the three and nine months ended September 30, 2016, respectively, and 802,462 and 692,209 antidilutive units for three and nine months ended September 30, 2015, respectively.

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Related Party Transactions

9 Months Ended

Sep. 30, 2016

Related Party Transactions [Abstract]

Related Party Transactions

Related Party Transactions

Supervisory Fee Revenue

We earned supervisory fees from affiliated entities not included in our condensed consolidated financial statements of $0.3 million and $0.5 million for the three months ended September 30, 2016 and 2015, respectively, and $1.1 million and $1.4 million for the nine months endedSeptember 30, 2016 and 2015, respectively. These fees are included within third-party management and other fees.

Property Management Fee Revenue

We earned property management fees from affiliated entities not included in our condensed consolidated financial statements of $0.1 million and $0.1 million for the three months ended September 30, 2016 and 2015, respectively, and $0.3 million and $0.2 million for the nine months endedSeptember 30, 2016 and 2015, respectively. These fees are included within third-party management and other fees.

Other

We are 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 receive 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 $0.06 million for the three months ended September 30, 2016 and 2015, respectively, and $0.2 million and $0.2 million for the nine months endedSeptember 30, 2016 and 2015, respectively. During August 2016, the previously shared office and leased spaces relocated to a new 5,351 square foot leased space at one of our properties, paying rent generally at a market rental rate. The affiliate has the right to cancel such lease without special payment on 90 days’ notice.

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

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Segment Reporting

9 Months Ended

Sep. 30, 2016

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 transfers as if the sales or transfers were to third parties, that is, at current market prices. We include our historical construction operation in "Other," and it includes all activities related to providing construction services to tenants and to other entities within and outside our company. As of March 27, 2015, we no longer solicited new business for our construction management business. We completed all projects that were in progress.

The following tables provide components of segment profit for each segment for the three and nine months endedSeptember 30, 2016 and 2015 (amounts in thousands):

	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
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
Interest expense	(17,939		)	—			—			(17,939		)
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

	Three Months Ended September 30, 2015
	Real Estate			Observatory			Other		Intersegment Elimination			Total
Revenues:
Rental revenue	$	110,903		$	—		$	—	$	—		$	110,903
Intercompany rental revenue	20,828			—			—		(20,828		)	—
Tenant expense reimbursement	23,096			—			—		—			23,096
Observatory revenue	—			35,702			—		—			35,702
Third-party management and other fees	618			—			—		—			618
Other revenue and fees	5,460			—			—		—			5,460
Total revenues	160,905			35,702			—		(20,828		)	175,779
Operating expenses:
Property operating expenses	41,052			—			—		—			41,052
Intercompany rent expense	—			20,828			—		(20,828		)	—
Ground rent expense	2,331			—			—		—			2,331
General and administrative expenses	10,182			—			—		—			10,182
Observatory expenses	—			7,896			—		—			7,896
Real estate taxes	23,613			—			—		—			23,613
Acquisition expenses	193			—			—		—			193
Depreciation and amortization	45,072			97			—		—			45,169
Total operating expenses	122,443			28,821			—		(20,828		)	130,436
Total operating income	38,462			6,881			—		—			45,343
Interest expense	(16,680		)	—			—		—			(16,680		)
Income before income taxes	21,782			6,881			—		—			28,663
Income tax expense	(474		)	(2,104		)	—		—			(2,578		)
Net income	$	21,308		$	4,777		$	—	$	—		$	26,085
Segment assets	$	3,070,234		$	235,937		$	2,596	$	—		$	3,308,767
Expenditures for segment assets	$	39,915		$	187		$	—	$	—		$	40,102

	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
Interest expense	(53,310		)	—			—			(53,310		)
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

	Nine Months Ended September 30, 2015
	Real Estate			Observatory			Other			Intersegment Elimination			Total
Revenues:
Rental revenue	$	333,827		$	—		$	—		$	—		$	333,827
Intercompany rental revenue	51,402			—			—			(51,402		)	—
Tenant expense reimbursement	59,878			—			—			—			59,878
Observatory revenue	—			84,525			—			—			84,525
Construction revenue	—			—			5,696			(3,715		)	1,981
Third-party management and other fees	1,658			—			—			—			1,658
Other revenue and fees	10,565			—			—			—			10,565
Total revenues	457,330			84,525			5,696			(55,117		)	492,434
Operating expenses:
Property operating expenses	120,341			—			—			—			120,341
Intercompany rent expense	—			51,402			—			(51,402		)	—
Ground rent expense	6,994			—			—			—			6,994
General and administrative expenses	28,395			—			—			—			28,395
Observatory expenses	—			23,391			—			—			23,391
Construction expenses	—			—			6,539			(3,317		)	3,222
Real estate taxes	69,543			—			—			—			69,543
Acquisition expenses	193			—			—			—			193
Depreciation and amortization	125,847			268			101			—			126,216
Total operating expenses	351,313			75,061			6,640			(54,719		)	378,295
Total operating income (loss)	106,017			9,464			(944		)	(398		)	114,139
Interest expense	(50,298		)	—			—			—			(50,298		)
Income (loss) before income taxes	55,719			9,464			(944		)	(398		)	63,841
Income tax benefit (expense)	(1,247		)	(2,376		)	340			—			(3,283		)
Net income (loss)	$	54,472		$	7,088		$	(604	)	$	(398	)	$	60,558
Expenditures for segment assets	$	109,104		$	211		$	—		$	—		$	109,315

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Subsequent Events

9 Months Ended

Sep. 30, 2016

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

None.

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Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2016

Accounting Policies [Abstract]

Basis of quarterly presentation and principles of combination

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.

For purposes of comparison, certain items shown in the 2015 unaudited condensed consolidated financial statements have been reclassified to conform to the presentation used for 2016.

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, 2015 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.

Consolidations for variable interest entity

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 as well as whether the entity is a variable interest entity (“VIE”) and we are 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. We had no VIEs as of September 30, 2016 and December 31, 2015.

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

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 reimbursement, estimate of percentage of completion on construction contracts, 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.

Recently Issued or Adopted Accounting Standards

Recently Issued or Adopted Accounting Standards

During August 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("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. We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

During January 2016, the FASB issued ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Liabilities, which makes targeted improvements to existing generally accepted accounting principles by requiring, among others, i) equity investments (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income, and ii) public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, iii) separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (that is, securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements. ASU No. 2016-01 will take effect for public companies for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

During April 2015, the FASB issued ASU No. 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs, which amends the requirements for the presentation of debt issuance costs and requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. ASU No. 2015-03 is effective for fiscal years, beginning after December 15, 2015 and interim periods within those fiscal years. ASU No. 2015-03 was amended in August 2015 by ASU No. 2015-15, Interest - Imputation of Interest (Subtopic 835-30) - Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements, to add to the Codification SEC staff guidance that the SEC staff will not object to an entity presenting the costs of securing line-of-credit arrangements as an asset, regardless of whether there are any outstanding borrowings. The SEC Observer to the Emerging Issues Task Force announced the staff guidance in response to questions that arose after the FASB issued ASU No. 2015-03. We adopted ASU 2015-03 as of December 31, 2015.

During February 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810) - Amendments to the Consolidation Analysis, which amends the criteria for determining which entities are considered VIEs, amends the criteria for determining if a service provider possesses a variable interest in a VIE and ends the deferral granted to investment companies for application of the VIE consolidation model. ASU No. 2015-02 is effective for fiscal years, beginning after December 15, 2015 and interim periods within those fiscal years. The implementation of this update did not cause any material changes to 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 will be effective beginning in 2017 and 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. We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

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Deferred Costs, Acquired Lease Intangibles and Goodwill (Tables)

9 Months Ended

Sep. 30, 2016

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

Schedule of Deferred Costs, Net

Deferred costs, net consisted of the following as of September 30, 2016 and December 31, 2015 (amounts in thousands):

	September 30, 2016			December 31, 2015
Leasing costs	$	137,925		$	121,864
Acquired in-place lease value and deferred leasing costs	258,880			285,902
Acquired above-market leases	76,532			81,680
	473,337			489,446
Less: accumulated amortization	(190,773		)	(178,767		)
Total deferred costs, net, excluding net deferred financing costs	$	282,564		$	310,679

Deferred financing costs, net, consisted of the following at September 30, 2016 and December 31, 2015 (amounts in thousands):

	September 30, 2016			December 31, 2015
Financing costs	$	23,044		$	20,882
Less: accumulated amortization	(10,949		)	(7,972		)
Total deferred financing costs, net	$	12,095		$	12,910

Schedule of Amortizing Acquired Intangible Assets and Liabilities

Amortizing acquired intangible assets and liabilities consisted of the following as of September 30, 2016 and December 31, 2015 (amounts in thousands):

	September 30, 2016			December 31, 2015
Acquired below-market ground leases	$	396,916		$	396,916
Less: accumulated amortization	(18,898		)	(13,025		)
Acquired below-market ground leases, net	$	378,018		$	383,891

	September 30, 2016			December 31, 2015
Acquired below-market leases	$	(135,633	)	$	(163,290	)
Less: accumulated amortization	47,925			59,119
Acquired below-market leases, net	$	(87,708	)	$	(104,171	)

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Debt (Tables)

9 Months Ended

Sep. 30, 2016

Debt Disclosure [Abstract]

Schedule of Debt

Debt consisted of the following as of September 30, 2016 and December 31, 2015 (amounts in thousands):

							As of September 30, 2016
	Principal Balance as of September 30, 2016			Principal Balance as of December 31, 2015			Stated Rate		Effective Rate(1)		Maturity Date(2)
Mortgage debt collateralized by:
Fixed rate mortgage debt
10 Bank Street	$	31,715		$	32,214		5.72	%	6.22	%	6/1/2017
1542 Third Avenue	17,906			18,222			5.90	%	6.61	%	6/1/2017
First Stamford Place	236,030			238,765			5.65	%	6.17	%	7/5/2017
1010 Third Avenue and 77 West 55th Street	26,646			27,064			5.69	%	6.39	%	7/5/2017
383 Main Avenue	28,811			29,269			5.59	%	6.04	%	7/5/2017
1333 Broadway	67,909			68,646			6.32	%	3.76	%	1/5/2018
1400 Broadway
(first lien mortgage loan)	67,974			68,732			6.12	%	3.41	%	2/5/2018
(second lien mortgage loan)	9,442			9,600			3.35	%	3.36	%	2/5/2018
112 West 34th Street
(first lien mortgage loan)	75,554			76,406			6.01	%	3.36	%	4/5/2018
(second lien mortgage loan)	9,543			9,640			6.56	%	3.67	%	4/5/2018
1350 Broadway	37,913			38,348			5.87	%	3.74	%	4/5/2018
Metro Center	96,483			97,950			3.59	%	3.66	%	11/5/2024
10 Union Square (3)	50,000			20,289			3.70	%	4.00	%	4/1/2026
Total mortgage debt	755,926			735,145
Senior unsecured notes - exchangeable	250,000			250,000			2.63	%	3.93	%	8/15/2019
Senior unsecured notes:
Series A	100,000			100,000			3.93	%	4.02	%	3/27/2025
Series B	125,000			125,000			4.09	%	4.18	%	3/27/2027
Series C	125,000			125,000			4.18	%	4.27	%	3/27/2030
Unsecured revolving credit facility	—			40,000			(4)		(4)		1/23/2019
Unsecured term loan facility	265,000			265,000			(5)		(5)		8/24/2022
Total principal	1,620,926			1,640,145
Unamortized premiums, net of unamortized discount	1,974			5,181
Deferred financing costs, net	(7,067		)	(12,910		)
Total	$	1,615,833		$	1,632,416

______________

(1) The effective rate is the yield as of September 30, 2016, 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) The mortgage loan collateralized by 10 Union Square was refinanced in March 2016.

(4) At September 30, 2016, the unsecured revolving credit facility bears a floating rate at 30 day LIBOR plus 1.15%. The rate at September 30, 2016 was 1.68%.

(5) The unsecured term loan facility bears a floating rate at 30 day LIBOR plus 1.60%. The rate at September 30, 2016 was 2.13%. 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.

Schedule of Maturities of Long-term Debt

Aggregate required principal payments at September 30, 2016 are as follows (amounts in thousands):

Year	Amortization		Maturities		Total
2016	$	3,086	$	—	$	3,086
2017	9,904		336,009		345,913
2018	2,880		262,210		265,090
2019	2,188		250,000		252,188
2020	2,268		—		2,268
Thereafter	9,706		742,675		752,381
Total	$	30,032	$	1,590,894	$	1,620,926

Schedule of Deferred Costs, Net

Deferred costs, net consisted of the following as of September 30, 2016 and December 31, 2015 (amounts in thousands):

	September 30, 2016			December 31, 2015
Leasing costs	$	137,925		$	121,864
Acquired in-place lease value and deferred leasing costs	258,880			285,902
Acquired above-market leases	76,532			81,680
	473,337			489,446
Less: accumulated amortization	(190,773		)	(178,767		)
Total deferred costs, net, excluding net deferred financing costs	$	282,564		$	310,679

Deferred financing costs, net, consisted of the following at September 30, 2016 and December 31, 2015 (amounts in thousands):

	September 30, 2016			December 31, 2015
Financing costs	$	23,044		$	20,882
Less: accumulated amortization	(10,949		)	(7,972		)
Total deferred financing costs, net	$	12,095		$	12,910

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Accounts Payable and Accrued Expenses (Tables)

9 Months Ended

Sep. 30, 2016

Payables and Accruals [Abstract]

Schedule of Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses consist of the following as of September 30, 2016 and December 31, 2015 (amounts in thousands):

	September 30, 2016		December 31, 2015
Accounts payable and accrued expenses	$	99,522	$	83,352
Payable to the estate of Leona M. Helmsley (1)	18,367		18,367
Interest rate swap agreements liability	31,227		1,922
Accrued interest payable	4,426		5,555
Due to affiliated companies	1,031		1,903
Accounts payable and accrued expenses	$	154,573	$	111,099

___________

(1) Reflects a payable to the estate of Leona M. Helmsley in the amount of New York City transfer taxes which would have been payable in absence of the estate's exemption from such tax.

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Financial Instruments and Fair Values (Tables)

9 Months Ended

Sep. 30, 2016

Fair Value Disclosures [Abstract]

Schedule of terms of agreements and fair values 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, 2016 and December 31, 2015 (dollar amounts in thousands):     

	As of September 30, 2016						September 30, 2016					December 31, 2015
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	$	—	$	(12,921	)	$	—	$	(1,620	)
Interest rate swap	100,000		3 Month LIBOR	2.5050%	July 5, 2017	July 5, 2027	—		(9,153		)	—		(148		)
Interest rate swap	100,000		3 Month LIBOR	2.5050%	July 5, 2017	July 5, 2027	—		(9,153		)	—		(154		)
							$	—	$	(31,227	)	$	—	$	(1,922	)

Schedule of 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 for the three and nine months endedSeptember 30, 2016 and 2015 (amounts in thousands):    

Effects of Cash Flow Hedges	Three Months Ended September 30, 2016		Three Months Ended September 30, 2015			Nine Months Ended September 30, 2016			Nine Months Ended September 30, 2015
Amount of gain (loss) recognized in other comprehensive income (loss) - effective portion	$	930	$	(4,384	)	$	(29,305	)	$	(4,384	)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense - effective portion	—		—			—			—
Amount of gain (loss) recognized in other income/expense - ineffective portion	—		—			—			—

Schedule of the aggregate carrying value of debt and estimates of fair value

The following tables summarize the carrying and estimated fair values of our financial instruments as of September 30, 2016 and December 31, 2015 (amounts in thousands):

	September 30, 2016
			Estimated Fair Value
	Carrying Value		Total		Level 1		Level 2		Level 3
Interest rate swaps included in accounts payable and accrued expenses	$	31,227	$	31,227	$	—	$	31,227	$	—
Mortgage notes payable	763,457		770,827		—		—		770,827
Senior unsecured notes - Exchangeable	240,658		290,325		290,325		—		—
Senior unsecured notes - Series A, B, and C	348,888		364,574		—		—		364,574
Unsecured term loan facility	262,830		265,000		—		—		265,000
Unsecured revolving credit facility	—		—		—		—		—

	December 31, 2015
			Estimated Fair Value
	Carrying Value		Total		Level 1		Level 2		Level 3
Interest rate swaps included in accounts payable and accrued expenses	$	1,922	$	1,922	$	—	$	1,922	$	—
Mortgage notes payable	747,661		752,350		—		—		752,350
Senior unsecured notes - Exchangeable	238,208		251,391		—		—		251,391
Senior unsecured notes - Series A, B, and C	348,810		344,501		—		—		344,501
Unsecured term loan facility	262,545		265,000		—		—		265,000
Unsecured revolving credit facility	35,192		40,000		—		—		40,000

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Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2016

Commitments and Contingencies Disclosure [Abstract]

Schedule of required payments on ground leases

Aggregate required payments on ground leases at September 30, 2016 are as follows (amounts in thousands):

2016	$	380
2017	1,518
2018	1,518
2019	1,518
2020	1,518
Thereafter	56,730
	$	63,182

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Capital (Tables)

9 Months Ended

Sep. 30, 2016

Stockholders' Equity Note Disclosure, Disclosure of Compensation Related Costs, Share-based Payments and Earnings Per Share [Abstract]

Summary of Restricted Stock and Long-Term Incentive Plan Activity

The following is a summary of ESRT restricted stock and LTIP unit activity for the nine months endedSeptember 30, 2016:

	Restricted Stock		LTIP Units		Weighted Average Grant Fair Value
Unvested balance at December 31, 2015	97,592		1,415,895		$	11.04
Vested	(4,350	)	(124,843	)	15.89
Granted	47,071		1,868,629		9.58
Forfeited	(278	)	—		17.97
Unvested balance at September 30, 2016	140,035		3,159,681		$	10.00

Schedule of Earnings Per Unit, Basic and Diluted

Earnings per unit for the three and nine months ended September 30, 2016 and 2015 is computed as follows (amounts in thousands, except per unit amounts):

	Three Months Ended,						Nine Months Ended,
	September 30, 2016			September 30, 2015			September 30, 2016			September 30, 2015
Numerator:
Net income	$	32,897		$	26,085		$	74,242		$	60,558
Private perpetual preferred unit distributions	(234		)	(234		)	(702		)	(702		)
Earnings allocated to unvested units	(225		)	(161		)	(575		)	(425		)
Net income attributable to common unitholders - basic and diluted	$	32,438		$	25,690		$	72,965		$	59,431
Denominator:
Weighted average units outstanding - basic	278,739			265,873			270,388			265,868
Effect of dilutive securities:
Stock-based compensation plans	1,090			—			378			—
Exchangeable senior notes	785			—			262			—
Weighted average units outstanding - diluted	280,614			265,873			271,028			265,868
Earnings per unit - basic and diluted	$	0.12		$	0.10		$	0.27		$	0.22

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Segment Reporting (Tables)

9 Months Ended

Sep. 30, 2016

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

The following tables provide components of segment profit for each segment for the three and nine months endedSeptember 30, 2016 and 2015 (amounts in thousands):

	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
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
Interest expense	(17,939		)	—			—			(17,939		)
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

	Three Months Ended September 30, 2015
	Real Estate			Observatory			Other		Intersegment Elimination			Total
Revenues:
Rental revenue	$	110,903		$	—		$	—	$	—		$	110,903
Intercompany rental revenue	20,828			—			—		(20,828		)	—
Tenant expense reimbursement	23,096			—			—		—			23,096
Observatory revenue	—			35,702			—		—			35,702
Third-party management and other fees	618			—			—		—			618
Other revenue and fees	5,460			—			—		—			5,460
Total revenues	160,905			35,702			—		(20,828		)	175,779
Operating expenses:
Property operating expenses	41,052			—			—		—			41,052
Intercompany rent expense	—			20,828			—		(20,828		)	—
Ground rent expense	2,331			—			—		—			2,331
General and administrative expenses	10,182			—			—		—			10,182
Observatory expenses	—			7,896			—		—			7,896
Real estate taxes	23,613			—			—		—			23,613
Acquisition expenses	193			—			—		—			193
Depreciation and amortization	45,072			97			—		—			45,169
Total operating expenses	122,443			28,821			—		(20,828		)	130,436
Total operating income	38,462			6,881			—		—			45,343
Interest expense	(16,680		)	—			—		—			(16,680		)
Income before income taxes	21,782			6,881			—		—			28,663
Income tax expense	(474		)	(2,104		)	—		—			(2,578		)
Net income	$	21,308		$	4,777		$	—	$	—		$	26,085
Segment assets	$	3,070,234		$	235,937		$	2,596	$	—		$	3,308,767
Expenditures for segment assets	$	39,915		$	187		$	—	$	—		$	40,102

	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
Interest expense	(53,310		)	—			—			(53,310		)
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

	Nine Months Ended September 30, 2015
	Real Estate			Observatory			Other			Intersegment Elimination			Total
Revenues:
Rental revenue	$	333,827		$	—		$	—		$	—		$	333,827
Intercompany rental revenue	51,402			—			—			(51,402		)	—
Tenant expense reimbursement	59,878			—			—			—			59,878
Observatory revenue	—			84,525			—			—			84,525
Construction revenue	—			—			5,696			(3,715		)	1,981
Third-party management and other fees	1,658			—			—			—			1,658
Other revenue and fees	10,565			—			—			—			10,565
Total revenues	457,330			84,525			5,696			(55,117		)	492,434
Operating expenses:
Property operating expenses	120,341			—			—			—			120,341
Intercompany rent expense	—			51,402			—			(51,402		)	—
Ground rent expense	6,994			—			—			—			6,994
General and administrative expenses	28,395			—			—			—			28,395
Observatory expenses	—			23,391			—			—			23,391
Construction expenses	—			—			6,539			(3,317		)	3,222
Real estate taxes	69,543			—			—			—			69,543
Acquisition expenses	193			—			—			—			193
Depreciation and amortization	125,847			268			101			—			126,216
Total operating expenses	351,313			75,061			6,640			(54,719		)	378,295
Total operating income (loss)	106,017			9,464			(944		)	(398		)	114,139
Interest expense	(50,298		)	—			—			—			(50,298		)
Income (loss) before income taxes	55,719			9,464			(944		)	(398		)	63,841
Income tax benefit (expense)	(1,247		)	(2,376		)	340			—			(3,283		)
Net income (loss)	$	54,472		$	7,088		$	(604	)	$	(398	)	$	60,558
Expenditures for segment assets	$	109,104		$	211		$	—		$	—		$	109,315

XML

Description of Business and Organization - Narrative (Details)	9 Months Ended
	Sep. 30, 2016 ft² parcel office_and_property
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property (in sqft)	10,100,000
OP units owned by the Company, percent	51.80%
Office Building
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property (in sqft)	9,400,000
Number of properties (in properties) | office_and_property	14
Office Building | Manhattan
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property (in sqft)	7,600,000
Number of properties (in 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 sqft)	1,900,000
Number of properties (in properties) | office_and_property	5
Development Parcel
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of properties (in 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 sqft)	204,452
Retail Site | Manhattan
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property (in sqft)	502,429
Number of properties (in properties) | office_and_property	4
Retail Site | Westport, Connecticut
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of properties (in 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 sqft)	380,000

XML

Summary of Significant Accounting Policies Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accounting Policies [Line Items]
Public relations costs	$ 0.5	$ 0.6	$ 1.8	$ 1.7
Minimum
Accounting Policies [Line Items]
Percent of observatory revenue in first quarter over a ten year period	16.00%		16.00%
Percent of observatory revenue in second quarter over a ten year period	26.00%		26.00%
Percent of observatory revenue in third quarter over a ten year period	31.00%		31.00%
Percent of observatory revenue in fourth quarter over a ten year period	23.00%		23.00%
Maximum
Accounting Policies [Line Items]
Percent of observatory revenue in first quarter over a ten year period	18.00%		18.00%
Percent of observatory revenue in second quarter over a ten year period	28.00%		28.00%
Percent of observatory revenue in third quarter over a ten year period	33.00%		33.00%
Percent of observatory revenue in fourth quarter over a ten year period	25.00%		25.00%

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Deferred Costs, Acquired Lease Intangibles and Goodwill - Schedule of Deferred Costs, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Leasing costs	$ 137,925	$ 121,864
Total deferred costs, gross amount	473,337	489,446
Less: accumulated amortization	(190,773)	(178,767)
Total deferred costs, net, excluding net deferred financing costs	282,564	310,679
Acquired in-place lease value and deferred leasing costs
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets	258,880	285,902
Acquired above-market leases
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets	$ 76,532	$ 81,680

XML

Deferred Costs, Acquired Lease Intangibles and Goodwill - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Deferred Costs [Line Items]
Net deferred financing costs	$ 12,095		$ 12,095		$ 12,910
Amortization of deferred leasing costs	6,100	$ 7,800	17,600	$ 19,200
Revenue related to amortization of acquired above- and below-market leases, net	1,200	4,800	6,300	14,700
Goodwill	491,479		491,479		$ 491,479
Lease Agreements
Deferred Costs [Line Items]
Amortization expense related to acquired lease intangibles	5,000	$ 9,800	19,700	$ 29,400
Observatory
Deferred Costs [Line Items]
Goodwill	227,500		227,500
Real Estate
Deferred Costs [Line Items]
Goodwill	264,000		264,000
Deferred costs, net | Revolving Credit Facility | Unsecured Revolving Credit Facility
Deferred Costs [Line Items]
Net deferred financing costs	$ 5,000		$ 5,000

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Deferred Costs, Acquired Lease Intangibles and Goodwill - Acquired Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Acquired below-market ground leases	$ 396,916	$ 396,916
Less: accumulated amortization	(18,898)	(13,025)
Acquired below-market ground leases, net	378,018	383,891
Acquired below-market leases	(135,633)	(163,290)
Less: accumulated amortization	47,925	59,119
Acquired below-market leases, net	$ (87,708)	$ (104,171)

XML

Debt - Schedule of Long term Debt (Details) - USD ($)	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	Aug. 31, 2015	Mar. 31, 2015	Aug. 31, 2014
Debt Instrument [Line Items]
Unsecured revolving credit facility, net	$ 0	$ 35,192,000
Deferred financing costs, net	(12,095,000)	(12,910,000)
Total	763,457,000	747,661,000
Mortgages
Debt Instrument [Line Items]
Total mortgage debt	755,926,000	735,145,000
Total principal	1,620,926,000	1,640,145,000
Unamortized premiums, net of unamortized discount	1,974,000	5,181,000
Deferred financing costs, net	(7,067,000)	(12,910,000)
Total	1,615,833,000	1,632,416,000
Mortgages | 10 Bank Street
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 31,715,000	32,214,000
Stated Rate	5.72%
Effective Rate	6.22%
Mortgages | 1542 Third Avenue
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 17,906,000	18,222,000
Stated Rate	5.90%
Effective Rate	6.61%
Mortgages | First Stamford Place
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 236,030,000	238,765,000
Stated Rate	5.65%
Effective Rate	6.17%
Mortgages | 1010 Third Avenue and 77 West 55th Street
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 26,646,000	27,064,000
Stated Rate	5.69%
Effective Rate	6.39%
Mortgages | 383 Main Avenue
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 28,811,000	29,269,000
Stated Rate	5.59%
Effective Rate	6.04%
Mortgages | 1333 Broadway
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 67,909,000	68,646,000
Stated Rate	6.32%
Effective Rate	3.76%
Mortgages | 1400 Broadway - First Lien
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 67,974,000	68,732,000
Stated Rate	6.12%
Effective Rate	3.41%
Mortgages | 1400 Broadway - Second Lien
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 9,442,000	9,600,000
Stated Rate	3.35%
Effective Rate	3.36%
Mortgages | 112 West 34th Street - First Lien
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 75,554,000	76,406,000
Stated Rate	6.01%
Effective Rate	3.36%
Mortgages | 112 West 34th Street - Second Lien
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 9,543,000	9,640,000
Stated Rate	6.56%
Effective Rate	3.67%
Mortgages | 1350 Broadway
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 37,913,000	38,348,000
Stated Rate	5.87%
Effective Rate	3.74%
Mortgages | Metro Center
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 96,483,000	97,950,000
Stated Rate	3.59%
Effective Rate	3.66%
Mortgages | 10 Union Square
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 50,000,000	20,289,000
Stated Rate	3.70%
Effective Rate	4.00%
Convertible Debt | Exchangeable Senior Notes due August 15, 2019
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 250,000,000	250,000,000
Stated Rate	2.625%				2.625%
Effective Rate	3.93%
Senior Notes | Series A Senior Notes due 2025
Debt Instrument [Line Items]
Total	$ 100,000,000	100,000,000
Stated Rate	3.93%			3.93%
Effective Rate	4.02%
Senior Notes | Series B Senior Notes due 2027
Debt Instrument [Line Items]
Total	$ 125,000,000	125,000,000
Stated Rate	4.09%			4.09%
Effective Rate	4.18%
Senior Notes | Series C Senior Notes due 2030
Debt Instrument [Line Items]
Total	$ 125,000,000	125,000,000
Stated Rate	4.18%			4.18%
Effective Rate	4.27%
Revolving Credit Facility | Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Unsecured revolving credit facility, net	$ 0	40,000,000
Effective Rate	1.68%
Revolving Credit Facility | Unsecured Revolving Credit Facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.15%
Revolving Credit Facility | Term Loan
Debt Instrument [Line Items]
Unsecured revolving credit facility, net	$ 265,000,000.0	$ 265,000,000	$ 265,000,000.0
Effective Rate	2.13%
Pay Rate	2.1485%
Revolving Credit Facility | Term Loan | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.60%

XML

Debt - Schedule of Maturities of Long-term Debt (Details) - Mortgages - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Amortization
2016, amortization	$ 3,086
2017, amortization	9,904
2018, amortization	2,880
2019, amortization	2,188
2020, amortization	2,268
Thereafter	9,706
Total amortization	30,032
Maturities
2016, maturities	0
2017, maturities	336,009
2018, maturities	262,210
2019, maturities	250,000
2020, maturities	0
Thereafter	742,675
Total maturities	1,590,894
Total long term debt
2016	3,086
2017	345,913
2018	265,090
2019	252,188
2020	2,268
Thereafter	752,381
Total	$ 1,620,926	$ 1,640,145

XML

Debt - Deferred Financing Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Debt Instrument [Line Items]
Financing costs	$ 23,044		$ 23,044		$ 20,882
Less: accumulated amortization	(10,949)		(10,949)		(7,972)
Total deferred financing costs, net	12,095		12,095		$ 12,910
Amortization of deferred financing costs	1,300	$ 1,100	3,700	$ 5,000
Revolving Credit Facility | Deferred costs, net | Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Total deferred financing costs, net	$ 5,000		$ 5,000

XML

Debt - Unsecured Revolving Credit Facility (Details)	Jan. 23, 2015 USD ($) option	Jul. 06, 2016 USD ($)
Secured Revolving and Term Credit Facility
Line of Credit Facility [Line Items]
Write off of deferred financing costs	$ 1,300,000
Unsecured Revolving Credit Facility | Revolving Credit Facility
Line of Credit Facility [Line Items]
Current borrowing capacity	800,000,000.0	$ 1,100,000,000.0
Maximum borrowing capacity	$ 1,250,000,000.00
Option to extend maturity, number | option	2
Extension period	6 months
Extension fee percent of outstanding commitments under revolving credit facility	0.075%
Maximum leverage ratio	60.00%
Maximum consolidated secured indebtedness to asset value	40.00%
Minimum tangible net worth	$ 745,400,000.0
Tangible net worth. minimum percent of net equity proceeds received	75.00%
Minimum adjusted EBITDA to consolidated fixed charges	1.50
Minimum net operating income to unsecured debt	1.75
Maximum ratio of unsecured debt to unencumbered asset value	60.00%
Maximum consolidated secured recourse debt to asset value	10.00%
Unsecured Revolving Credit Facility | Revolving Credit Facility | Eurodollar | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.875%
Unsecured Revolving Credit Facility | Revolving Credit Facility | Eurodollar | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.60%
Unsecured Revolving Credit Facility | Revolving Credit Facility | Base Rate | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.00%
Unsecured Revolving Credit Facility | Revolving Credit Facility | Base Rate | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.60%

XML

Debt - Senior Unsecured Notes (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2015	Aug. 31, 2014
Debt Instrument [Line Items]
Amortization of deferred financing costs	$ 1,300,000	$ 1,100,000	$ 3,700,000	$ 5,000,000
Convertible Debt | Exchangeable Senior Notes due August 15, 2019
Debt Instrument [Line Items]
Debt instrument face amount						$ 250,000,000.0
Stated rate	2.625%		2.625%			2.625%
Interest expense debt	$ 2,400,000	2,400,000	$ 7,300,000	7,300,000
Contractual interest rate	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
Shares converted (in shares)			51.5095
Conversion price (in USD per share)						$ 19.41
Senior Notes | Series A, Series B, and Series C Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Debt instrument face amount					$ 350,000,000
Senior Notes | Series A Senior Notes due 2025
Debt Instrument [Line Items]
Debt instrument face amount					$ 100,000,000
Stated rate	3.93%		3.93%		3.93%
Senior Notes | Series B Senior Notes due 2027
Debt Instrument [Line Items]
Debt instrument face amount					$ 125,000,000
Stated rate	4.09%		4.09%		4.09%
Senior Notes | Series C Senior Notes due 2030
Debt Instrument [Line Items]
Debt instrument face amount					$ 125,000,000
Stated rate	4.18%		4.18%		4.18%

XML

Debt - Senior Unsecured Term Loan Facility (Details) - USD ($)	1 Months Ended	9 Months Ended
	Aug. 31, 2015	Sep. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Unsecured revolving credit facility, net		$ 0	$ 35,192,000
Revolving Credit Facility | Term Loan
Debt Instrument [Line Items]
Unsecured revolving credit facility, net	$ 265,000,000.0	$ 265,000,000.0	$ 265,000,000
Pay Rate		2.1485%
Prepayment premium, period one	2.00%
Prepayment premium, period two	1.00%
Revolving Credit Facility | Term Loan | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate		1.60%
Revolving Credit Facility | Term Loan | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.40%
Revolving Credit Facility | Term Loan | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	2.35%
Revolving Credit Facility | Term Loan | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	0.40%
Revolving Credit Facility | Term Loan | Base Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	1.35%

XML

Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Accounts payable and accrued expenses	$ 99,522	$ 83,352
Payable to the estate of Leona M. Helmsley	18,367	18,367
Interest rate swap agreements liability	31,227	1,922
Accrued interest payable	4,426	5,555
Due to affiliated companies	1,031	1,903
Accounts payable and accrued expenses	$ 154,573	$ 111,099

XML

Financial Instruments and Fair Values - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($) derivative	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) derivative	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap agreements liability	$ 31,227		$ 31,227		$ 1,922
Unrealized gain (loss) on valuation of interest rate swap agreements	930	$ (4,384)	(29,305)	$ (4,384)
Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap agreements liability	31,800		31,800
Designated as Hedging Instrument | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized gain (loss) on valuation of interest rate swap agreements	$ 900		(29,300)
Loss expected to be reclassified within twelve months			$ 1,200
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, number of instruments held (derivative) | derivative	3		3
Notional amount	$ 465,000		$ 465,000
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	$ 31,200		$ 31,200

XML

Financial Instruments and Fair Values - Terms of Agreements and Fair Value (Details) - Cash Flow Hedging - Designated as Hedging Instrument - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Asset	$ 0	$ 0
Liability	(31,227,000)	(1,922,000)
LIBOR | Interest Rate Swap, One Month LIBOR, 2.1485%
Derivatives, Fair Value [Line Items]
Notional Amount	$ 265,000,000
Pay Rate	2.1485%
Asset	$ 0	0
Liability	(12,921,000)	(1,620,000)
LIBOR | Interest Rate Swap, Three Month LIBOR, 2.5050%
Derivatives, Fair Value [Line Items]
Notional Amount	$ 100,000,000
Pay Rate	2.505%
Asset	$ 0	0
Liability	(9,153,000)	(148,000)
LIBOR | Interest Rate Swap, Three Month LIBOR, 2.5050%, 2
Derivatives, Fair Value [Line Items]
Notional Amount	$ 100,000,000
Pay Rate	2.505%
Asset	$ 0	0
Liability	$ (9,153,000)	$ (154,000)

XML

Financial Instruments and Fair Values - Gains and (Loss) of Cash Flow Hedges (Details) - Designated as Hedging Instrument - Interest Rate Swap - Cash Flow Hedging - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in other comprehensive income (loss) - effective portion	$ 930	$ (4,384)	$ (29,305)	$ (4,384)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense - effective portion	0	0	0	0
Amount of gain (loss) recognized in other income/expense - ineffective portion	$ 0	$ 0	$ 0	$ 0

XML

Financial Instruments and Fair Values - Schedule of the Aggregate Carrying Value of Debt and Estimates of Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap agreements liability	$ 31,227	$ 1,922
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap agreements liability	31,227	1,922
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap agreements liability	31,227	1,922
Mortgages | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial instruments	763,457	747,661
Mortgages | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial instruments	770,827	752,350
Senior Notes | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial instruments	348,888	348,810
Senior Notes | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial instruments	364,574	344,501
Secured Revolving Credit Facility | Mortgages | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial instruments	240,658	238,208
Secured Revolving Credit Facility | Mortgages | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial instruments	290,325	251,391
Fair Value, Inputs, Level 1 | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap agreements liability	0	0
Fair Value, Inputs, Level 1 | Mortgages | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial instruments	0	0
Fair Value, Inputs, Level 1 | Senior Notes | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial instruments	0	0
Fair Value, Inputs, Level 1 | Secured Revolving Credit Facility | Mortgages | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial instruments	290,325	0
Fair Value, Inputs, Level 2 | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap agreements liability	31,227	1,922
Fair Value, Inputs, Level 2 | Mortgages | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial instruments	0	0
Fair Value, Inputs, Level 2 | Senior Notes | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial instruments	0	0
Fair Value, Inputs, Level 2 | Secured Revolving Credit Facility | Mortgages | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial instruments	0	0
Fair Value, Inputs, Level 3 | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap agreements liability	0	0
Fair Value, Inputs, Level 3 | Mortgages | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial instruments	770,827	752,350
Fair Value, Inputs, Level 3 | Senior Notes | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial instruments	364,574	344,501
Fair Value, Inputs, Level 3 | Secured Revolving Credit Facility | Mortgages | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial instruments	0	251,391
Revolving Credit Facility | Term Loan | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial instruments	262,830	262,545
Revolving Credit Facility | Term Loan | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial instruments	265,000	265,000
Revolving Credit Facility | Unsecured Revolving Credit Facility | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial instruments	0	35,192
Revolving Credit Facility | Unsecured Revolving Credit Facility | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial instruments	0	40,000
Revolving Credit Facility | Fair Value, Inputs, Level 1 | Term Loan | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial instruments	0	0
Revolving Credit Facility | Fair Value, Inputs, Level 1 | Unsecured Revolving Credit Facility | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial instruments	0	0
Revolving Credit Facility | Fair Value, Inputs, Level 2 | Term Loan | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial instruments	0	0
Revolving Credit Facility | Fair Value, Inputs, Level 2 | Unsecured Revolving Credit Facility | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial instruments	0	0
Revolving Credit Facility | Fair Value, Inputs, Level 3 | Term Loan | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial instruments	265,000	265,000
Revolving Credit Facility | Fair Value, Inputs, Level 3 | Unsecured Revolving Credit Facility | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial instruments	$ 0	$ 40,000

XML

Rental Income (Details)	9 Months Ended
	Sep. 30, 2016
Minimum
Operating Leases [Line Items]
Term of lease	1 year
Maximum
Operating Leases [Line Items]
Term of lease	16 years

XML

Commitments and Contingencies - Litigation (Details)	Oct. 14, 2014 participant	Sep. 04, 2013 participant	May 17, 2013 USD ($) participant	Jan. 28, 2013 participant	Sep. 28, 2012 USD ($) llc	Mar. 14, 2014 participant	Dec. 24, 2013 claim	Jun. 20, 2013 participant	Mar. 31, 2012 claim
Loss Contingencies [Line Items]
Number of additional investors who apposed the settlement								1
Number of investors who had filed a notice of appeal						1
New York State Supreme Court, New York County
Loss Contingencies [Line Items]
Number of plaintiffs opting out of settlement	12
Pending Litigation | New York State Supreme Court, New York County
Loss Contingencies [Line Items]
Number of claims | claim							4
Number of plaintiffs	4,500
Predecessor | New York State Supreme Court, New York County
Loss Contingencies [Line Items]
Damages awarded | $					$ 55,000,000
Percent of damages awarded required to be in cash					80.00%
Number of LLC's | llc					3
Maximum difference between exchange value and prospectus statement					10.00%
Proceeds from issuance of common stock threshold amount of consolidation considerations | $					$ 600,000,000.0
Number of plaintiffs opting out of settlement		12	12
Number of investors in pursuit of appeal who opted out of settlement		2
Attorney fees sought | $			$ 15,000,000
Attorney expenses sought | $			295,895
Attorney fees awarded | $			11,590,000
Attorney expenses awarded | $			$ 265,282
Predecessor | New York State Supreme Court, New York County | ESRT
Loss Contingencies [Line Items]
Maximum percent of freely-tradable common stock or partnership units					20.00%
Predecessor | Pending Litigation
Loss Contingencies [Line Items]
Number of plaintiffs				6
Predecessor | Pending Litigation | New York State Supreme Court, New York County
Loss Contingencies [Line Items]
Number of claims | claim									5
Number of plaintiffs		6	4,500

XML

Commitments and Contingencies - Unfunded Capital Expenditures (Details) $ in Millions	Sep. 30, 2016 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Unfunded capital expenditures	$ 57.1

XML

Commitments and Contingencies - Ground Lease Payment Commitments (Details) - Ground Lease $ in Thousands	Sep. 30, 2016 USD ($)
Operating Leased Assets [Line Items]
2016	$ 380
2017	1,518
2018	1,518
2019	1,518
2020	1,518
Thereafter	56,730
Aggregate required payments on ground leases	$ 63,182

XML

Capital (Details) - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended
	Aug. 23, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Class of Stock [Line Items]
Gross proceeds from sale of shares	$ 621,800	$ 611,278	$ 0
Shares and Units [Abstract]
OP units outstanding (in shares)		299,099,533
OP units owned by the Company (in shares)		154,925,644
OP units owned by the Company, percent		51.80%
OP units not owned by the Company (in shares)		144,173,889
OP units not owned by the Company, percent		48.20%
Percentage of dividends on common stock received until performance criteria met for LTIP units		10.00%
Percentage of dividends on common stock received after performance criteria met for LTIP units		90.00%
Percentage of dividends on common stock received in periods after performance criteria met for LTIP units		100.00%
Series PR operating partnership units
Shares and Units [Abstract]
OP units not owned by the Company (in shares)		93,507,101		93,863,451
Qatar Investment Authority, affiliate
Class of Stock [Line Items]
Economic interest held by affiliate of QIA	9.90%
Common shares | Common class A shares
Class of Stock [Line Items]
Issuance of common shares (in shares)	29,610,854
Common shares issued (in dollars per share)	$ 21.00
General partner | Series PR operating partnership units
Class of Stock [Line Items]
Issuance of common shares (in shares)	29,610,854	29,611,000

XML

Capital - Distributions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Stockholders' Equity Note Disclosure, Disclosure of Compensation Related Costs, Share-based Payments and Earnings Per Share [Abstract]
Distributions paid to OP unitholders	$ 31.4	$ 22.7	$ 82.6	$ 68.2
Distributions paid to preferred unitholders	$ 0.2	$ 0.2	$ 0.7	$ 0.7

XML

Capital - Incentive and Share-based Compensation (Details) $ / shares in Units, $ in Millions	1 Months Ended					3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2016 USD ($) shares	Feb. 29, 2016 USD ($) vesting_installment shares	Jun. 30, 2015 USD ($) shares	Feb. 28, 2015 USD ($) tranche vesting_installment shares	Jan. 31, 2015 USD ($) shares	Sep. 30, 2016 USD ($) $ / shares shares	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) $ / shares shares	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility rate look-back period (in years)								6 years
Annual forfeiture rate, percent								0.05
Weighted Average Grant Fair Value [Roll Forward]
Beginning balance, Unvested, Weighted Average Grant Fair Value (in USD per share) | $ / shares								$ 11.04
Vested, Weighted Average Grant Fair Value (in USD per share) | $ / shares								15.89
Granted, Weighted Average Grant Fair Value (in USD per share) | $ / shares								9.58
Forfeited, Weighted Average Grant Fair Value (in USD per share) | $ / shares								17.97
Ending balance, Unvested, Weighted Average Grant Fair Value (in USD per share) | $ / shares						$ 10.00		$ 10.00		$ 11.04
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
Awards that Meet Age and Service Requirements for Vesting
Weighted Average Grant Fair Value [Roll Forward]
Noncash share-based compensation expense recognized | $						$ 0.1	$ 0.0	$ 0.6	$ 0.5
Unrecognized compensation expense | $						0.5		$ 0.5
Unrecognized compensation expense, period for recognition (in years)								2 years 2 months 18 days
Awards that Do Not Meet Age and Service Requirements for Vesting
Weighted Average Grant Fair Value [Roll Forward]
Noncash share-based compensation expense recognized | $						2.5	$ 1.4	$ 6.7	$ 3.8
Unrecognized compensation expense | $						$ 21.0		$ 21.0
Unrecognized compensation expense, period for recognition (in years)								2 years 7 months 18 days
Long-Term Incentive Plan Units and Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period | $								$ 18.4
Risk free interest rate								0.84%
Expected volatility rate								24.00%
Weighted Average Grant Fair Value [Roll Forward]
Granted, Weighted Average Grant Fair Value (in USD per share) | $ / shares								$ 9.60
Long-Term Incentive Plan Unit [Member]
Restricted Stock and LTIP Unit Activity [Roll Forward]
Beginning balance, Unvested (in shares)								1,415,895
Vested (in shares)								(124,843)
Granted (in shares)								1,868,629
Forfeited (in shares)								0
Ending balance, Unvested (in shares)						3,159,681		3,159,681		1,415,895
Time Based Long-Tern Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period | $		$ 1.4		$ 0.8				$ 0.1
Number of Vesting Installments		3		3
Award vesting period (in years)		4 years		4 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)		47,168		33,398
Performance Based Long-Term Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period | $		$ 0.8		$ 0.4
Number of Vesting Installments		2		2
Award vesting period (in years)		3 years		3 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)		112,925		33,398
Restricted Stock
Restricted Stock and LTIP Unit Activity [Roll Forward]
Beginning balance, Unvested (in shares)								97,592
Vested (in shares)								(4,350)
Granted (in shares)								47,071
Forfeited (in shares)								(278)
Ending balance, Unvested (in shares)						140,035		140,035		97,592
Time Restricted Shares
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)		44,198
Long-Term Incentive Plan Unit and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term								2 years 9 months 18 days
Dividend rate								2.10%
Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual forfeiture rate, percent								0.00
Executive Officer | Time Based Long-Tern Incentive Plan Unit | 2013 Plan Units Vesting January 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period | $				$ 2.9
Number of Vesting Installments | tranche				3
Award vesting period (in years)				4 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)				168,033
Executive Officer | Time Based Long-Tern Incentive Plan Unit | 2013 Plan Units Vesting February 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period | $				$ 0.2
Number of Vesting Installments | vesting_installment				3
Award vesting period (in years)				4 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)				13,736
Executive Officer | Time Based Long-Tern Incentive Plan Unit | 2013 Plan Units Vesting January 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period | $		$ 5.6
Number of Vesting Installments | vesting_installment		3
Award vesting period (in years)		4 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)		368,225
Executive Officer | Time Based Long-Tern Incentive Plan Unit | 2013 Plan Units Vesting three years after February 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period | $		$ 1.0
Award vesting percentage after three years		30.00%
Award vesting percentage after four years		30.00%
Award vesting percentage after five years		40.00%
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)		62,814
Executive Officer | Performance Based Long-Term Incentive Plan Unit | 2013 Plan Units Vesting January 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period | $				$ 1.3
Number of Vesting Installments | tranche				2
Award vesting period (in years)				3 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)				154,266
Executive Officer | Performance Based Long-Term Incentive Plan Unit | 2013 Plan Units Vesting February 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period | $				$ 0.1
Number of Vesting Installments | vesting_installment				2
Award vesting period (in years)				3 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)				13,736
Executive Officer | Performance Based Long-Term Incentive Plan Unit | 2013 Plan Units Vesting January 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period | $		$ 8.8
Number of Vesting Installments | vesting_installment		2
Award vesting period (in years)		3 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)		1,230,228
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual forfeiture rate, percent								0.00
Director | Time Based Long-Tern Incentive Plan Unit | 2013 Plan Units Vesting February 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period | $			$ 0.6
Award vesting period (in years)			3 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)			35,082
Director | Time Based Long-Tern Incentive Plan Unit | 2013 Plan Units Vesting three years after June 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period | $	$ 0.8
Award vesting period (in years)	3 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)	43,257
Other Employees | Time Based Long-Tern Incentive Plan Unit | 2013 Plan Units Vesting February 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period | $										$ 0.1
ESRT | Performance Restricted Shares
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)				14,315
ESRT | Time Restricted Shares
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)				14,315
2013 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under the plan (shares)						12,200,000		12,200,000
Number of shares that remain available for future issuance (shares)						8,300,000		8,300,000
2013 Plan | Time Based Long-Tern Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period | $					$ 0.2
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)					9,531

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Capital - Earnings Per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerator:
Net income	$ 32,897	$ 26,085	$ 74,242	$ 60,558
Private perpetual preferred unit distributions	(234)	(234)	(702)	(702)
Earnings allocated to unvested units	(225)	(161)	(575)	(425)
Net income attributable to common unitholders - basic and diluted	$ 32,438	$ 25,690	$ 72,965	$ 59,431
Denominator:
Weighted average units outstanding - basic (in units)	278,739,000	265,873,000	270,388,000	265,868,000
Effect of dilutive securities - stock-based compensation plans (in units)	1,090,000	0	378,000	0
Effect of dilutive securities - exchangeable senior notes (in units)	785,000	0	262,000	0
Weighted average units outstanding - diluted (in units)	280,614,000	265,873,000	271,028,000	265,868,000
Earnings per unit - basic and diluted (in USD per share)	$ 0.12	$ 0.10	$ 0.27	$ 0.22
Antidilutive securities (in units)		802,462		692,209

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Related Party Transactions - Related Party Revenue (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2016 ft² property	Sep. 30, 2016 USD ($) ft² director	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) ft² director	Sep. 30, 2015 USD ($)	Jul. 31, 2016 ft² property
Related Party Transaction [Line Items]
Area of real estate property (in sqft) | ft²		10,100,000		10,100,000
Number of directors (in directors) | director		1		1
Affliliated entity | Supervisory Fee Revenue
Related Party Transaction [Line Items]
Revenue from related parties		$ 300	$ 500	$ 1,100	$ 1,400
Affliliated entity | Property Management Fee Revenue
Related Party Transaction [Line Items]
Revenue from related parties		100	100	300	200
Affliliated entity | Leased space rental
Related Party Transaction [Line Items]
Revenue from related parties		$ 70	$ 60	200	$ 200
Area of real estate property (in sqft) | ft²						3,074
Number of properties (in properties) | property	1					1
Lease cancellation, notice period	90 days
Affliliated entity | Annualized rent revenue
Related Party Transaction [Line Items]
Revenue from related parties				$ 5,700
Undivided Interest
Related Party Transaction [Line Items]
Area of real estate property (in sqft) | ft²	5,351					647

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Segment Reporting - Reportable Segments (Details)	9 Months Ended
	Sep. 30, 2016 segment
Segment Reporting [Abstract]
Number of reportable segments	2

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Segment Reporting - Segment Revenue and Profit or Loss Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]
Rental revenue	$ 115,634	$ 110,903	$ 343,155	$ 333,827
Intercompany rental revenue	0	0	0	0
Tenant expense reimbursement	19,176	23,096	56,350	59,878
Observatory revenue	38,093	35,702	91,112	84,525
Construction revenue	0	0	0	1,981
Third-party management and other fees	404	618	1,372	1,658
Other revenue and fees	2,541	5,460	6,748	10,565
Total revenues	175,848	175,779	498,737	492,434
Property operating expenses	38,585	41,052	115,075	120,341
Intercompany rent expense	0	0	0	0
Ground rent expenses	2,331	2,331	6,994	6,994
General and administrative expenses	11,798	10,182	35,623	28,395
Observatory expenses	7,250	7,896	21,900	23,391
Construction expenses	0	0	0	3,222
Real estate taxes	24,691	23,613	71,773	69,543
Acquisition expenses	0	193	98	193
Depreciation and amortization	37,607	45,169	115,382	126,216
Total operating expenses	122,262	130,436	366,845	378,295
Total operating income (loss)	53,586	45,343	131,892	114,139
Interest expense	(17,939)	(16,680)	(53,310)	(50,298)
Income (loss) before income taxes	35,647	28,663	78,582	63,841
Income tax benefit (expense)	(2,750)	(2,578)	(4,340)	(3,283)
Net income (loss)	32,897	26,085	74,242	60,558
Segment assets	3,882,569	3,308,767	3,882,569	3,308,767	$ 3,300,650
Expenditures for segment assets	52,828	40,102	140,099	109,315
Intersegment Elimination
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]
Rental revenue	0	0	0	0
Intercompany rental revenue	(22,983)	(20,828)	(55,189)	(51,402)
Tenant expense reimbursement	0	0	0	0
Observatory revenue	0	0	0	0
Construction revenue				(3,715)
Third-party management and other fees	0	0	0	0
Other revenue and fees	0	0	0	0
Total revenues	(22,983)	(20,828)	(55,189)	(55,117)
Property operating expenses	0	0	0	0
Intercompany rent expense	(22,983)	(20,828)	(55,189)	(51,402)
Ground rent expenses	0	0	0	0
General and administrative expenses	0	0	0	0
Observatory expenses	0	0	0	0
Construction expenses				(3,317)
Real estate taxes	0	0	0	0
Acquisition expenses		0	0	0
Depreciation and amortization	0	0	0	0
Total operating expenses	(22,983)	(20,828)	(55,189)	(54,719)
Total operating income (loss)	0	0	0	(398)
Interest expense	0	0	0	0
Income (loss) before income taxes	0	0	0	(398)
Income tax benefit (expense)	0	0	0	0
Net income (loss)	0	0	0	(398)
Segment assets	0	0	0	0
Expenditures for segment assets	0	0	0	0
Real Estate | Operating Segments
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]
Rental revenue	115,634	110,903	343,155	333,827
Intercompany rental revenue	22,983	20,828	55,189	51,402
Tenant expense reimbursement	19,176	23,096	56,350	59,878
Observatory revenue	0	0	0	0
Construction revenue				0
Third-party management and other fees	404	618	1,372	1,658
Other revenue and fees	2,536	5,460	6,738	10,565
Total revenues	160,733	160,905	462,804	457,330
Property operating expenses	38,585	41,052	115,075	120,341
Intercompany rent expense	0	0	0	0
Ground rent expenses	2,331	2,331	6,994	6,994
General and administrative expenses	11,798	10,182	35,623	28,395
Observatory expenses	0	0	0	0
Construction expenses				0
Real estate taxes	24,691	23,613	71,773	69,543
Acquisition expenses		193	98	193
Depreciation and amortization	37,421	45,072	115,002	125,847
Total operating expenses	114,826	122,443	344,565	351,313
Total operating income (loss)	45,907	38,462	118,239	106,017
Interest expense	(17,939)	(16,680)	(53,310)	(50,298)
Income (loss) before income taxes	27,968	21,782	64,929	55,719
Income tax benefit (expense)	(332)	(474)	(1,018)	(1,247)
Net income (loss)	27,636	21,308	63,911	54,472
Segment assets	3,636,262	3,070,234	3,636,262	3,070,234
Expenditures for segment assets	52,828	39,915	140,052	109,104
Observatory | Operating Segments
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]
Rental revenue	0	0	0	0
Intercompany rental revenue	0	0	0	0
Tenant expense reimbursement	0	0	0	0
Observatory revenue	38,093	35,702	91,112	84,525
Construction revenue				0
Third-party management and other fees	0	0	0	0
Other revenue and fees	5	0	10	0
Total revenues	38,098	35,702	91,122	84,525
Property operating expenses	0	0	0	0
Intercompany rent expense	22,983	20,828	55,189	51,402
Ground rent expenses	0	0	0	0
General and administrative expenses	0	0	0	0
Observatory expenses	7,250	7,896	21,900	23,391
Construction expenses				0
Real estate taxes	0	0	0	0
Acquisition expenses		0	0	0
Depreciation and amortization	186	97	380	268
Total operating expenses	30,419	28,821	77,469	75,061
Total operating income (loss)	7,679	6,881	13,653	9,464
Interest expense	0	0	0	0
Income (loss) before income taxes	7,679	6,881	13,653	9,464
Income tax benefit (expense)	(2,418)	(2,104)	(3,322)	(2,376)
Net income (loss)	5,261	4,777	10,331	7,088
Segment assets	246,307	235,937	246,307	235,937
Expenditures for segment assets	$ 0	187	$ 47	211
Other | Operating Segments
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]
Rental revenue		0		0
Intercompany rental revenue		0		0
Tenant expense reimbursement		0		0
Observatory revenue		0		0
Construction revenue				5,696
Third-party management and other fees		0		0
Other revenue and fees		0		0
Total revenues		0		5,696
Property operating expenses		0		0
Intercompany rent expense		0		0
Ground rent expenses		0		0
General and administrative expenses		0		0
Observatory expenses		0		0
Construction expenses				6,539
Real estate taxes		0		0
Acquisition expenses		0		0
Depreciation and amortization		0		101
Total operating expenses		0		6,640
Total operating income (loss)		0		(944)
Interest expense		0		0
Income (loss) before income taxes		0		(944)
Income tax benefit (expense)		0		340
Net income (loss)		0		(604)
Segment assets		2,596		2,596
Expenditures for segment assets		$ 0		$ 0