10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

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

For the fiscal year ended December 31, 2018

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, 12th Floor

New York, New York 10120

(Address of principal executive offices) (Zip Code)

(212) 687-8700

(Registrant's telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:
Title of Each Class	Name of Each Exchange on Which Registered
Series ES operating partnership units	NYSE - Arca
Series 60 operating partnership units	NYSE - Arca
Series 250 operating partnership units	NYSE - Arca
Securities registered pursuant to Section 12(g) of the Act:
None

Indicate by check mark if the Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes   x    No o

Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes   o    No x

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 every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  x     No  o

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§229.405 of this chapter) is not contained herein, and will not be contained, to the best of the registrant's knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. x

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

Large accelerated filer  x	Accelerated filer  o
Non-accelerated filer  o	Smaller reporting company  o
	Emerging Growth Company o

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

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

As of February 22, 2019, there were 29,238,349 units of the Registrants' Series ES operating partnership units outstanding, 7,944,584 units of the Series 60 operating partnership units outstanding, and 3,993,052 units of the Series 250 operating partnership units outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Our sole general partner is Empire State Realty Trust, Inc. Portions of the Empire State Realty Trust, Inc.'s Proxy Statement for its 2019 Annual Stockholders' Meeting (which is scheduled to be held on May 16, 2019) to be filed within 120 days after the end of Empire State Realty Trust, Inc.'s fiscal year are incorporated by reference into Part III of this Annual Report on Form 10-K.

	EMPIRE STATE REALTY OP, L.P.
	FORM 10-K
	TABLE OF CONTENTS
		PAGE
PART I.
1.	Business	2
1A.	Risk Factors	11
1B.	Unresolved Staff Comments	36
2.	Properties	37
3.	Legal Proceedings	44
4.	Mine Safety Disclosures	44
PART II.
5.	Market for Registrant's Common Equity, Related Stockholders Matters and Issuer Purchases of Equity Securities	45
6.	Selected Financial Data	47
7.	Management's Discussion and Analysis of Financial Condition and Results of Operations	49
7A.	Quantitative and Qualitative Disclosure about Market Risk	69
8.	Financial Statements and Supplementary Data	69
9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	69
9A.	Controls and Procedures	70
9B.	Other Information	72
PART III
10.	Directors, Executive Officers and Corporate Governance	72
11.	Executive Compensation	72
12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	72
13.	Certain Relationships and Related Transactions, and Director Independence	72
14.	Principal Accounting Fees and Services	72
PART IV
15.	Exhibits, Financial Statements and Schedules	72
16.	Form 10-K Summary	75

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DEFINITIONS

• "annualized rent" represents annualized base rent and current reimbursement for operating expenses and real estate taxes;

• "formation transactions" mean a series of transactions pursuant to which we acquired, substantially currently with the completion of the Offering through a series of contributions and merger transactions, our portfolio of real estate assets that were held by the existing entities, the ownership interests in the certain management entities of our predecessor and one development parcel;

• "fully diluted basis" means all outstanding shares of Empire State Realty Trust, Inc.'s Class A common stock at such time plus shares of Class A common stock that may be issuable upon the exchange of operating partnership units on a one-for-one basis and shares of Class A common stock issuable upon the conversion of Class B common stock on a one-for-one basis, which is not the same as the meaning of “fully diluted” under generally accepted accounting principles in the United States of America, or "GAAP";

• "enterprise value" means all outstanding shares of Empire State Realty Trust, Inc.'s Class A common stock at such time plus shares of Class A common stock that may be issuable upon the exchange of operating partnership units on a one-for-one basis and shares of Class A common stock issuable upon the conversion of Class B common stock on a one-for-one basis multiplied by the Class A common share price at December 31, 2018, plus private perpetual preferred units plus consolidated debt at December 31, 2018;

• "Malkin Group” means all of the following, as a group: Anthony E. Malkin, Peter L. Malkin and each of their spouses and lineal descendants (including spouses of such descendants), any estates of any of the foregoing, any trusts now or hereafter established for the benefit of any of the foregoing, or any corporation, partnership, limited liability company or other legal entity controlled by Anthony E. Malkin or any permitted successor in such entity for the benefit of any of the foregoing; provided, however that solely with respect to tax protection rights and parties who entered into the contribution agreements with respect to the formation transactions, the Malkin Group shall also include the lineal descendants of Lawrence A. Wien and his spouse (including spouses of such descendants), any estates of the foregoing, any trusts now or hereafter established for the benefit of any of the foregoing, or any corporation, partnership, limited liability company or other legal entity controlled by Anthony E. Malkin for the benefit of the foregoing;

• the "Offering" means the initial public offering of our Class A common stock which was completed on October 7, 2013;

• "our company," "we," "us" and "our" refer to Empire State Realty OP L.P., a Delaware limited partnership, together with its consolidated subsidiaries;

• "securityholder" means holders of our Series ES, Series 250, Series 60 and Series PR operating partnership units, including those units held by Empire State Realty Trust, Inc.;

• "traded OP Units" mean our Series ES, Series 250 and Series 60 operating partnership units.

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PART I

ITEM 1. BUSINESS

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 ("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, including the Empire State Building, the world's most famous building. Empire State Realty Trust, Inc.'s Class A common stock, par value $0.01 per share, is listed on the New York Stock Exchange under the symbol "ESRT."

As of December 31, 2018, our total portfolio, contained 10.1 million rentable square feet of office and retail space, and was 88.8% occupied. Including signed leases not yet commenced, our total portfolio was 91.8% leased. As of December 31, 2018, we owned 14 office properties (including three long-term ground leasehold interests) encompassing approximately 9.4 million rentable square feet of office space, which were approximately 88.6% occupied or 91.8% leased including signed leases not yet commenced. Nine of these properties are located in the midtown Manhattan market and encompass approximately 7.6 million rentable square feet of office space, including the Empire State Building. Our Manhattan office properties also contain 513,606 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 approximately 1.8 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 December 31, 2018, our portfolio also included four standalone retail properties located in Manhattan and two standalone retail properties located in the city center of Westport, Connecticut, encompassing 205,748 rentable square feet in the aggregate. As of December 31, 2018, our standalone retail properties were 96.3% leased.

The Empire State Building offers panoramic views of New York and neighboring states from its world-famous 86thand 102ndfloor observatories that draw millions of visitors per year. The number of visitors to the observatories was approximately 3,805,000 and 3,940,000 for the years ended December 31, 2018 and 2017, respectively. The 86th floor observatory has a 360-degree outdoor deck as well as indoor viewing galleries to accommodate guests day and night, all year-round. The 102ndfloor observatory is entirely indoors and offers a 360-degree view of New York City from 1,250 feet above ground.

We were organized as a Delaware limited partnership on November 28, 2011. 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 December 31, 2018, ESRT owned approximately 57.7% of our operating partnership units.

Our Competitive Strengths

We believe that we distinguish ourselves from other owners and operators of office and retail properties as a result of the following competitive strengths:

• Irreplaceable Portfolio of Office Properties in Midtown Manhattan. Our Manhattan office properties are located in one of the most prized office markets in the world due to a combination of supply constraints, high barriers to entry, near-term and long-term prospects for job creation, vacancy absorption and rental rate growth. Management believes these properties could not be replaced today on a cost-competitive basis, if at all. As of December 31, 2018, we owned nine Manhattan office properties (including three long-term ground leasehold interests) encompassing approximately 7.6 million rentable square feet of office space, including the Empire State Building, our flagship property. Unlike traditional office buildings, the Empire State Building provides us with a significant source of income from its observatory and broadcasting operations. All of these properties include premier retail space on their ground floor and/or contiguous levels, which comprise 513,606 rentable square feet in the aggregate and some of which have recently undergone significant redevelopments. We believe the high quality of our buildings, services and amenities, their desirable locations and commuter access to mass transportation should allow us to increase rents and occupancy to generate positive cash flow and growth.

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• Expertise in Repositioning and Redeveloping Manhattan Office Properties. We have substantial expertise in redeveloping and repositioning Manhattan office properties, having invested through December 31, 2018 a total of approximately $865.7 million (excluding tenant improvement costs and leasing commissions) in our Manhattan office properties since we assumed full control of the day-to-day management of these properties beginning with One Grand Central Place in November 2002 through 2006. We have substantial experience in upgrading, redeveloping and modernizing building lobbies, corridors, bathrooms, elevator cabs and old, antiquated spaces to include new ceilings, lighting, pantries and base building systems (including electric distribution and air conditioning), as well as enhanced tenant amenities. We have successfully aggregated and are continuing to aggregate smaller spaces to offer larger blocks of space, including multiple floors, that are attractive to larger, higher credit-quality tenants and to offer new, pre-built suites with improved layouts. As part of this program, we have converted some or all of the second and third floor office space of certain of our Manhattan office properties to higher rent retail space. We believe that the post-redevelopment high quality of our buildings and the service we provide also attract higher credit-quality tenants for larger spaces at rents above similar vintage buildings, and below new construction, thus defining a new price point and allowing us to drive superior returns on invested capital per square foot. In addition, we believe that, based on the results of our base building energy efficiency retrofit, and energy efficient tenant build-outs, at the Empire State Building, the lessons of which we are applying throughout our portfolio, we derive cost savings through innovative energy efficiency retrofitting and sustainability initiatives, reducing direct and indirect energy costs paid both by tenants and by us throughout our other Manhattan office properties and greater New York metropolitan area office properties, which improves our competitive position.

• Leader in Energy Efficiency Retrofitting. We have pioneered certain practices in energy efficiency, and at the Empire State Building we have partnered with the Clinton Climate Initiative, Johnson Controls Inc., Jones Lang LaSalle and the Rocky Mountain Institute to create and implement a groundbreaking, replicable process for integrating energy efficiency retrofits in the existing built environment. The reduced energy consumption lowers costs for us and our tenants, and we believe creates a competitive advantage for our properties. We believe that higher quality tenants in general place a higher priority on sustainability, controlling costs, and minimizing contributions to greenhouse gases. We believe our expertise in this area gives us the opportunity to attract higher quality tenants at higher rental rates, in addition to lowering our expenses. As a result of our efforts, approximately 84.0% of our portfolio square feet is Energy Star certified, including the Empire State Building. As a result of the energy efficiency retrofits, we estimate that the Empire State Building has reduced energy use by 45% of its pre-retrofit level of energy use, resulting in over $5.2 million of annual energy cost savings at pre-retrofit utility rate levels. Johnson Controls Inc. has guaranteed minimum energy cost savings of $2.2 million annually, from 2010 through 2025, with respect to certain of the retrofits in which Johnson Controls Inc. was project leader. Actual 2017 energy cost savings was $6.1million for the whole building retrofits, out of which $5.3 million savings was achieved against the guaranteed savings. We are implementing cost justified energy efficiency retrofit projects in our Manhattan and greater New York metropolitan area office properties based on our work at the Empire State Building. Finally, we maintain a series of management practices utilizing recycling of tenant and construction waste, recycled content carpets, low off-gassing paints and adhesives, “green” pest control and cleaning solutions and recycled paper products throughout our office portfolio. We believe that our portfolio’s attractiveness is enhanced by these practices and that this should result in higher rental rates, longer lease terms and higher quality tenants.

• Attractive Retail Locations in Densely Populated Metropolitan Communities. As of December 31, 2018, our portfolio also included six standalone retail properties and retail space at the ground floor and/or lower levels of our Manhattan office properties, encompassing 719,354 rentable square feet in the aggregate, which were approximately 90.8% occupied in the aggregate. All of these properties are located in dynamic retail corridors with convenient access to mass transportation, a diverse tenant base and high pedestrian traffic and/or main destination locations. Our retail portfolio includes 697,913 rentable square feet located in Manhattan and 21,441 rentable square feet located in Westport, Connecticut. Our current retail rents are below current market rents, and as we recapture and redevelop retail space, we are able to drive strong positive spreads on newly leased space. We have retail expirations in the coming years that will allow us to further increase our cash flows. Our retail tenants cover a number of industries, and include Bank of America; Bank Santander (Sovereign Bank); Best Buy Mobile; Charles Schwab; Chipotle; Dr. Martens AirWair USA; Duane Reade/Walgreen's; FedEx; FootLocker; HSBC; JP Morgan Chase; Lululemon; New Cingular Wireless; Panera Bread; Potbelly Sandwich Works; Sephora; Shake Shack; Sprint; Starbucks; Target; Theory; TJ Maxx; and Urban Outfitters. Our Westport, Connecticut retail properties are located on Main Street, the main pedestrian thoroughfare in Westport, Connecticut, and have the advantage of being adjacent to one of the few available large-scale parking lots in town.

• Experienced and Committed Management Team with Proven Track Record. Our senior management team is highly regarded in the real estate community and has extensive relationships with a broad range of brokers, owners, tenants

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and lenders. We have developed relationships we believe enable us to both secure high credit-quality tenants on attractive terms, as well as provide us with potential acquisition opportunities. We have substantial in-house expertise and resources in asset and property management, leasing, marketing, acquisitions, construction, development and financing and a platform that is highly scalable. Members of our senior management team have worked in the real estate industry for an average of approximately 34 years with extensive experience in greater New York area real estate, through many economic cycles. We take an intensive, hands-on approach to the management of our portfolio and quality brand building. As of December 31, 2018, our named executive officers owned 11.3% of ESRT's common stock on a fully diluted basis (including shares of common stock and operating partnership units as to which Anthony E. Malkin, our chief executive officer, disclaims beneficial ownership except to the extent of his pecuniary interest therein), and therefore their interests are aligned with those of ESRT's securityholders and they are incentivized to maximize returns to ESRT's securityholders.

• Strong Balance Sheet Supportive of Future Growth. As of December 31, 2018, we had total debt outstanding of approximately $1.9 billion, with a weighted average interest rate of 3.84% and a weighted average maturity of 8.1 years. Additionally, we had approximately $1.1 billion of available borrowing capacity under our unsecured revolving and term credit facility as of December 31, 2018. We had cash and cash equivalents and short-term investments of $605.0 million at December 31, 2018. Our consolidated net debt represented 23.4% of enterprise value. Excluding principal amortization, we have approximately $250.0 million of debt maturing in 2019 and no debt maturing in 2020. We continue to extend and ladder our debt maturities, increase our access to a variety of capital sources and maintain low leverage with significant capacity on our balance sheet. This low level of leverage gives us flexibility to cover our capital program and to take advantage of opportunities to acquire additional properties as and when we see compelling opportunities. We believe that lower levered companies outperform over the long term.

Business and Growth Strategies

Our primary business objectives are to maximize cash flow and total returns to our securityholders and to increase the value of our properties through the pursuit of the following business and growth strategies:

• Vacating, Redeveloping, and Leasing of Redeveloped Space at Our Manhattan Office Properties. As of December 31, 2018, our Manhattan office properties (excluding the retail component of these properties) were approximately 88.8% occupied, or 92.7% leased including signed leases not commenced, and had approximately 0.5 million rentable square feet of available space (excluding signed leases not commenced). Our program of redevelopment necessarily includes vacating older less desirable suites, demolishing them for re-leasing as full or multi-floor blocks, or as new pre-built suites, and re-leasing them. We believe our redevelopment and repositioning program for our Manhattan office properties results in our leasing space to better credit tenants and higher rents, while achieving returns of approximately 8%. Over time, as we have created and redeveloped large blocks of available space, we have leased them to higher quality tenants at higher rents, and intend to continue to execute on this program over the years to come. To date we believe these efforts have accelerated our ability to lease space to new higher credit-quality tenants, many of which have expanded the office space they lease from us over time. We also employ a pre-built suite strategy in selected portions of some of our properties to appeal to many credit-worthy smaller tenants by fitting out some available space with new ceilings, lighting, pantries and base building systems (including electric distribution and air conditioning) for immediate occupancy. These pre-built suites deploy energy efficiency strategies developed in our work at the Empire State Building and are designed with efficient layouts sought by a wide array of users which we believe will require only minor painting and carpeting for future re-leasing thus reducing our future costs. We expect to achieve returns on investment of approximately 8% on our pre-built suites. Over time, as we have redeveloped the spaces in our buildings, we believe we will increase our occupancy.

• Increase Existing Below-Market Rents. The purpose of our redevelopment is to sign leases for larger amounts of space to better credit tenants at higher rents. To date, we have capitalized on this opportunity and we believe we have significant embedded, de-risked growth that we can capture as we execute on the successful repositioning of our Manhattan office portfolio and improving market fundamentals to increase rents. For example, we expect to benefit from the re-leasing of 6.1%, or approximately 464,792 rentable square feet (including month-to-month leases), of our Manhattan office leases expiring during 2019, which we generally believe are currently at below market rates. These expiring leases represent a weighted average base rent of $54.33 per square foot based on current measurements. As older leases expire, we expect to continue to upgrade certain space to further increase rents. Our concentration in Manhattan and the greater New York metropolitan area should also enable us to benefit from increased rents associated with current and anticipated near-term improvements in the financial and economic environment in these areas. We also expect to benefit from our price positioning, as we command prices that are above comparable vintage properties due to the quality of our newly developed space and our attractive amenities but below new construction.

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• Complete the Redevelopment and Repositioning of Our Current Portfolio. We intend to continue to increase occupancy, improve tenant quality and enhance cash flow and value by completing the redevelopment and repositioning of our Manhattan office properties. We intend selectively to continue to allow leases for smaller spaces to expire or relocate smaller tenants in order to aggregate, demolish and re-demise existing office space into larger blocks of vacant space, which we believe will attract higher credit-quality tenants at higher rental rates. We apply rigorous underwriting analysis to determine if aggregation of vacant space for future leasing to larger tenants will improve our cash flows over the long term. In addition, we are a leader in developing economically justified energy efficiency retrofitting and sustainability and have made it a portfolio-wide initiative. We believe this makes our properties desirable to high credit-quality tenants at higher rental rates and longer lease terms.

• Pursue Attractive Acquisition and Development Opportunities. We will opportunistically pursue attractive opportunities to acquire office and retail properties. For the foreseeable future, we intend to focus our acquisition strategy primarily on Manhattan office properties and, to a lesser extent, office and multi-tenanted retail properties in densely populated communities in the greater New York metropolitan area and other markets we may identify in the future. We believe we can utilize our industry relationships (including well-known real estate owners in Manhattan), brand recognition, and our expertise in redeveloping and repositioning office properties to identify significant acquisition opportunities where we believe we can increase occupancy and rental rates. We also believe there is growth opportunity to acquire and reposition additional stand-alone retail spaces. Our strong balance sheet, access to capital, and ability to offer operating partnership units in tax deferred acquisition transactions should give us significant flexibility in structuring and consummating acquisitions. Further, we have a development site, Metro Tower at the Stamford Transportation Center, which is adjacent to our Metro Center property, which we believe to be one of the premier office buildings in Connecticut. All required zoning approvals have been obtained to allow development of an approximately 380,000 rentable square foot office tower and garage. We intend to develop this site when we deem the appropriate combination of market and other conditions are in place.

• Proactively Manage Our Portfolio. We believe our proactive, service-intensive approach to asset and property management helps increase occupancy and rental rates. We utilize our comprehensive building management services and our strong commitment to tenant and broker relationships and satisfaction to negotiate attractive leasing deals and to attract high credit-quality tenants. We proactively manage our rent roll and maintain continuous communication with our tenants. We foster strong tenant relationships by being responsive to tenant needs. We do this through the amenities we provide, the quality of our buildings and services, our employee screening and training, energy efficiency initiatives, and preventative maintenance and prompt repairs. Our attention to detail is integral to serving our clients and building our brand. Our properties have received numerous industry awards for their operational efficiency. We believe long-term tenant relationships will improve our operating results over time by reducing leasing, marketing and tenant improvement costs and reducing tenant turnover. We do extensive diligence on our tenants’ (current and prospective) balance sheets, businesses and business models to determine if we will establish long-term relationships in which they will both renew with us and expand over time. We have had 163 tenant expansions within our portfolio totaling over 1.2 million square feet since 2013.

Leasing    

We are focused on maintaining a brand that tenants associate with a consistently high level of quality of services, installations, maintenance and amenities with long term financial stability. Through our commitment to brokers, we have developed long-term relationships that focus on negotiating attractive transactions with high credit-quality tenants. We proactively manage and cultivate our industry relationships and make the most senior members of our management team available to our constituencies. We believe that our consistent, open dialogue with our tenants and brokers enables us to maximize our redevelopment and repositioning opportunities. Our focus on performance and perspective allows us to concentrate on the ongoing management of our portfolio, while seeking opportunities for growth in the future.

Property Management

We protect our investments by regularly monitoring our properties, performing routine preventive maintenance, and implementing capital improvement programs in connection with property redevelopment and life cycle replacement of equipment and systems. We presently self-manage all of our properties. We proactively manage our properties and rent rolls to (i) aggregate smaller demised spaces to create large blocks of vacant space, to attract high credit-quality tenants at higher rental rates, and (ii) create efficient, modern, pre-built offices that can be rented through several lease cycles and attract better credit-quality tenants. We aggressively manage and control operating expenses at all of our properties. In addition, we have made energy efficiency retrofitting and sustainability a portfolio-wide initiative driven by economic return. We pass on cost savings

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achieved by such improvements to our tenants through lower utility costs and reduced operating expense escalations. We believe these initiatives make our properties more desirable to a broader tenant base than the properties of our competitors.

Business Segments

Our reportable segments consist of a real estate segment and an observatory segment. Our real estate segment includes all activities related to the ownership, management, operation, acquisition, repositioning and disposition of our real estate assets. Our observatory segment operates 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 different marketing strategies. We account for intersegment sales and rent as if the sales or rent were to third parties, that is, at current market prices.

Regulation

General

The properties in our portfolio are subject to various laws, ordinances and regulations, including regulations relating to common areas. We believe each of the existing properties has the necessary permits and approvals to operate its business.

Americans with Disabilities Act

Our properties must comply with Title III of the Americans with Disabilities Act, or ADA, to the extent that such properties are “public accommodations” as defined by the ADA. The ADA may require removal of structural barriers to access by persons with disabilities in certain public areas of our properties where such removal is readily achievable. We believe the existing properties are in substantial compliance with the ADA and that we will not be required to make substantial capital expenditures to address the requirements of the ADA. However, noncompliance with the ADA could result in imposition of fines or an award of damages to private litigants. The obligation to make readily achievable accommodations is an ongoing one, and we will continue to assess our properties and to make alterations as appropriate in this respect.

Environmental Matters

Under various federal, state and/or local laws, ordinances and regulations, as a current or former owner or operator of real property, we may be liable for costs and damages resulting from the presence or release of hazardous substances, waste, or petroleum products at, on, in, under or from such property, including costs for investigation or remediation, natural resource damages, or third party liability for personal injury or property damage. These laws often impose liability without regard to whether the owner or operator knew of, or was responsible for, the presence or release of such materials, and the liability may be joint and several. Some of our properties have been or may be impacted by contamination arising from current or prior uses of the property or adjacent properties for commercial, industrial or other purposes. Such contamination may arise from spills of petroleum or hazardous substances or releases from tanks used to store such materials. We also may be liable for the costs of remediating contamination at off-site disposal or treatment facilities when we arrange for disposal or treatment of hazardous substances at such facilities, without regard to whether we comply with environmental laws in doing so. The presence of contamination or the failure to remediate contamination on our properties may adversely affect our ability to attract and/or retain tenants, and our ability to develop or sell or borrow against those properties. In addition to potential liability for cleanup costs, private plaintiffs may bring claims for personal injury, property damage or for similar reasons. Environmental laws also may create liens on contaminated sites in favor of the government for damages and costs it incurs to address such contamination. Moreover, if contamination is discovered on our properties, environmental laws may impose restrictions on the manner in which that property may be used or how businesses may be operated on that property.

Some of our properties are adjacent to or near other properties used for industrial or commercial purposes or that have contained or currently contain underground storage tanks used to store petroleum products or other hazardous or toxic substances. Releases from these properties could impact our properties. In addition, some of our properties have previously been used by former owners or tenants for commercial or industrial activities, e.g., gas stations and dry cleaners, and a portion of the Metro Tower site is currently used for automobile parking and fueling, that may release petroleum products or other hazardous or toxic substances at such properties or to surrounding properties. While certain properties contain or contained uses that could have or have impacted our properties, we are not aware of any liabilities related to environmental contamination that we believe will have a material adverse effect on our operations.

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Soil contamination has been identified at 69-97 Main Street in Westport, Connecticut. The affected soils are more than four feet below the ground surface. An Environmental Land Use Restriction has been imposed on this site to ensure the soil is not exposed, excavated or disturbed such that it could create a risk of migration of pollutants or a potential hazard to human health or the environment. While the contamination is currently contained, the potential resale value of this property and our ability to finance or refinance this property in the future may be adversely affected as a result of such contamination. In addition, pursuant to the Environmental Land Use Restriction, plans for the redevelopment of the property would be subject to the review of the Town of Westport, Connecticut among other conditions.

The property situated at 500 Mamaroneck Avenue in Harrison, New York was the subject of a voluntary remedial action work cleanup plan performed by the former owner following its conveyance of title to the present owners under an agreement with the New York State Department of Environmental Conservation, or NYDEC. As a condition to the issuance of a “no further action” letter, NYDEC required that certain restrictive and affirmative covenants be recorded against the subject property. In substantial part, these include prohibition against construction that would disturb the soil cap isolating certain contaminated subsurface soil, limiting the use of such property to commercial uses, implementing engineering controls to assure that improvements be kept in good condition, not using ground water at the site for potable purposes without treatment, implementing safety procedures for workers to follow excavating at the site to protect their health and safety and filing an annual certification that the controls implemented in accordance with the voluntary remedial action work cleanup plan remain in place. Furthermore, a substantial portion of the site that had been substantially unimproved prior to acquisition may not be further developed.

In addition, our properties are subject to various federal, state and local environmental and health and safety laws and regulations. Noncompliance with these environmental and health and safety laws and regulations could subject us or our tenants to liability. These liabilities could affect a tenant’s ability to make rental payments to us. Moreover, changes in laws could increase the potential costs of compliance with such laws and regulations or increase liability for noncompliance. This may result in significant unanticipated expenditures or may otherwise materially and adversely affect our operations, or those of our tenants, which could in turn have a material adverse effect on us. We sometimes require our tenants to comply with environmental and health and safety laws and regulations and to indemnify us for any related liabilities in our leases with them. But in the event of the bankruptcy or inability of any of our tenants to satisfy such obligations, we may be required to satisfy such obligations. We are not presently aware of any instances of material non-compliance with environmental or health and safety laws or regulations at our properties, and we believe that we and/or our tenants have all material permits and approvals necessary under current laws and regulations to operate our properties.

As the owner or operator of real property, we may also incur liability based on various building conditions. For example, buildings and other structures on properties that we currently own or operate or those we acquire or operate in the future contain, may contain, or may have contained, asbestos-containing material, or ACM. Environmental and health and safety laws require that ACM be properly managed and maintained and may impose fines or penalties on owners, operators or employers for non-compliance with those requirements. These requirements include special precautions, such as removal, abatement or air monitoring, if ACM would be disturbed during maintenance, redevelopment or demolition of a building, potentially resulting in substantial costs. In addition, we may be subject to liability for personal injury or property damage sustained as a result of releases of ACM into the environment. We are not presently aware of any material liabilities related to building conditions, including any instances of material non-compliance with asbestos requirements or any material liabilities related to asbestos.

In addition, our properties may contain or develop harmful mold or suffer from other indoor air quality issues, which could lead to liability for adverse health effects or property damage or costs for remediation. When excessive moisture accumulates in buildings or on building materials, mold growth may occur, particularly if the moisture problem remains undiscovered or is not addressed over a period of time. Some molds may produce airborne toxins or irritants. Indoor air quality issues can also stem from inadequate ventilation, chemical contamination from indoor or outdoor sources, and other biological contaminants such as pollen, viruses and bacteria. Indoor exposure to airborne toxins or irritants above certain levels can be alleged to cause a variety of adverse health effects and symptoms, including allergic or other reactions. As a result, the presence of significant mold or other airborne contaminants at any of our properties could require us to undertake a costly remediation program to contain or remove the mold or other airborne contaminants from the affected property or increase indoor ventilation. In addition, the presence of significant mold or other airborne contaminants could expose us to liability from our tenants, employees of our tenants or others if property damage or personal injury occurs. We are not presently aware of any material adverse indoor air quality issues at our properties.

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Insurance

We carry comprehensive liability, fire, extended coverage, earthquake, terrorism and rental loss insurance covering all of our Manhattan properties and our greater New York metropolitan area properties under a blanket policy. We carry additional all-risk property and business insurance, which includes terrorism insurance, on the Empire State Building through ESRT Captive Insurance Company L.L.C., or ESRT Captive Insurance, our wholly owned captive insurance company. ESRT Captive Insurance covers terrorism insurance for $1.2 billion in losses in excess of $800 million per occurrence suffered by the Empire State Building, providing us with aggregate terrorism coverage of $2 billion at that property. ESRT Captive Insurance fully reinsures the 18% coinsurance under the Terrorism Risk Insurance Program Reauthorization Act of 2015 (TRIPRA) and the difference between the TRIPRA captive deductible and policy deductible of $25,000 for non-Nuclear, Biological, Chemical and Radiological exposures. We purchased a $50 million limit of Nuclear, Biological, Chemical and Radiological (NBCR) insurance in excess of a $1.0 million deductible in the commercial insurance market. ESRT Captive Insurance provides NBCR insurance with a limit of $1.95 billion in excess of the $50 million policy. As a result, we remain only liable for the 18% coinsurance under TRIPRA for NBCR exposures within ESRT Captive Insurance, as well as a deductible equal to 20% of ESRT Captive Insurance’s prior year’s premium. As long as we own ESRT Captive Insurance, we are responsible for ESRT Captive Insurance’s liquidity and capital resources, and ESRT Captive Insurance’s accounts are part of our consolidated financial statements. If we experience a loss and ESRT Captive Insurance is required to pay under its insurance policy, we would ultimately record the loss to the extent of its required payment. The policies described above cover certified terrorism losses as defined under the Terrorism Risk Insurance Act of 2002 (TRIA) and subsequent extensions. On January 12, 2015, the President of the United States signed into law TRIPRA, which extends TRIA through December 31, 2020. TRIA provides for a system of shared public and private compensation for insured losses resulting from acts of terrorism. As a result, the certified terrorism coverage provided by ESRT Captive Insurance is eligible for 82% coinsurance provided by the United States Treasury in excess of a statutorily calculated deductible. ESRT Captive Insurance reinsures 100% of its 18% coinsurance for non-NBCR exposures. The 18% coinsurance on NBCR exposures is retained by ESRT Captive Insurance.

Reinsurance contracts do not relieve ESRT Captive Insurance from its primary obligations to its policyholders. Additionally, failure of the various reinsurers to honor their obligations could result in significant losses to ESRT Captive Insurance. The reinsurance has been ceded to reinsurers approved by the State of Vermont. ESRT Captive Insurance continually evaluates the reinsurers’ financial condition by considering published financial stability ratings of the reinsurers and other factors. There can be no assurance that reinsurance will continue to be available to ESRT Captive Insurance to the same extent and at the same cost. ESRT Captive Insurance may choose in the future to reevaluate the use of reinsurance to increase or decrease the amounts of risk it cedes.

In addition to insurance held through ESRT Captive Insurance described above, we carry terrorism insurance on all of our properties in an amount and with deductibles which we believe are commercially reasonable.

Competition

The leasing of real estate is highly competitive in Manhattan and the greater New York metropolitan market in which we operate. We compete with numerous acquirers, developers, owners and operators of commercial real estate, many of which own or may seek to acquire or develop properties similar to ours in the same markets in which our properties are located. The principal means of competition are rent charged, location, services provided and the nature and condition of the facility to be leased. In addition, we face competition from other real estate companies, including other REITs, private real estate funds, domestic and foreign financial institutions, life insurance companies, pension trusts, partnerships, individual investors and others, that may have greater financial resources or access to capital than we do or that are willing to acquire properties in transactions which are more highly leveraged or are less attractive from a financial viewpoint than we are willing to pursue. In addition, competition from new and existing observatories and/or broadcasting operations could have a negative impact on revenues from our observatory operations and/or broadcasting revenues. Adverse impacts on domestic and international travel and changes in foreign currency exchange rates may also decrease demand in the future, which could have a material adverse effect on our results of operations, financial condition and ability to make distributions to our securityholders. If our competitors offer space at rental rates below current market rates, below the rental rates we currently charge our tenants, in better locations within our markets or in higher quality facilities, we may lose potential tenants and we may be pressured to reduce our rental rates below those we currently charge in order to retain tenants when our tenants’ leases expire.

ESRT's Tax Status as a REIT

ESRT elected to be taxed as a REIT and operate in a manner that we believe allows it to qualify as a REIT for U.S. federal income tax purposes commencing with its taxable year ended December 31, 2013. We believe that ESRT has been organized in conformity with the requirements for qualification and taxation as a REIT under the Internal Revenue Code of

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1986, as amended (the "Code"), and that its intended manner of operation will enable it to meet the requirements for qualification and taxation as a REIT. So long as ESRT qualifies as a REIT, it generally will not be subject to U.S. federal income tax on its net taxable income that ESRT distributes currently to its securityholders. If ESRT fails to qualify as a REIT in any taxable year and does not qualify for certain statutory relief provisions, ESRT will be subject to U.S. federal income tax at regular corporate rates and may be precluded from qualifying as a REIT for the subsequent four taxable years following the year during which it lost its REIT qualification. Even if ESRT qualifies for taxation as a REIT, it may be subject to certain U.S. federal, state and local taxes on its income or property.

Inflation

Substantially all of our leases provide for separate real estate tax and operating expense escalations. In addition, many of the leases provide for fixed base rent increases. We believe inflationary increases may be at least partially offset by the contractual rent increases and expense escalations described above. We do not believe inflation has had a material impact on our historical financial position or results of operations.

Seasonality

Our observatory business is subject to tourism trends and weather, and therefore does experience some seasonality. During the past ten years of our annual observatory revenue, approximately 16% to 18% 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 do not consider the balance of our business to be subject to material seasonal fluctuations.

Employees

As of December 31, 2018, we had 813 employees, 134 of whom were managers and professionals. There are currently collective bargaining agreements which cover the workforce that services all of our office properties. Management believes that its relationship with employees is good.

Offices

Our principal executive offices are located at 111 West 33rd Street, 12th floor, New York, New York 10120. In addition, we have six additional regional leasing and property management offices in Manhattanand the greater New York metropolitan area. Our current facilities are adequate for our present and future operations, although we may add regional offices, depending upon our future operations.

Available Information

ESRT, our sole general partner, has a website address at http://www.empirestaterealtytrust.com. The information found on, or otherwise accessible through, ESRT's website is not incorporated information and does not form a part of this Annual Report on Form 10-K or any other report or document ESRT or we file with or furnish to the SEC and ESRT makes available, free of charge, on or through the SEC Filings section of its website, ESRT's and our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, as soon as reasonably practicable after ESRT or we electronically file such material with, or furnish it to, the SEC. ESRT has also posted on its website the Audit Committee Charter, Compensation Committee Charter, Finance Committee Charter, Nominating and Corporate Governance Committee Charter, Corporate Governance Guidelines and Code of Business Conduct and Ethics, which govern its directors, officers and employees. Within the time period required by the SEC, ESRT will post on its website any amendment to its Code of Business Conduct and Ethics and any waiver applicable to its senior financial officers, and its executive officers or directors. The SEC maintains an Internet site (http://www.sec.gov) that contains reports, proxy and information statements, and other information regarding issuers that file electronically with the SEC.

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ITEM 1A. RISK FACTORS

RISK FACTORS

You should carefully consider these risk factors, together with all of the other information included in this Annual Report on Form 10-K, including our consolidated financial statements and the related notes thereto, before you decide whether to make an investment in our securities. The risks set out below are not the only risks we face. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially and adversely affect our business, prospects, financial condition, cash flows, liquidity, funds from operations, results of operations, price of our securities and the shares of ESRT's Class A common stock, ability to service our indebtedness, and/or ability to make cash distributions to our securityholders (including those necessary to maintain ESRT’s REIT qualification). In such case, the value of our securities and the trading price of our traded OP units could decline, and you may lose all or a significant part of your investment. Some statements in the following risk factors, constitute forward looking statements. See the section entitled “Forward-Looking Statements.”

Risks Related to Our Properties and Our Business

All of our properties are located in Manhattan and the greater New York metropolitan area, in particular midtown Manhattan, and adverse economic or regulatory developments in this area could materially and adversely affect us.

All of our properties are located in Manhattan and the greater New York metropolitan area, in particular midtown Manhattan, as well as nearby markets in Fairfield County, Connecticut and Westchester County, New York. Nine of our 14 office properties are located in midtown Manhattan. As a result, our business is dependent on the condition of the New York City economy in general and the market for office space in midtown Manhattan in particular, which exposes us to greater economic risks than if we owned a more geographically diverse portfolio. We are susceptible to adverse developments in the New York City economic and regulatory environment (such as business layoffs or downsizing, industry slowdowns, relocations of businesses, increases in real estate and other taxes, costs of complying with governmental regulations or increased regulation). Such adverse developments could materially reduce the value of our real estate portfolio and our rental revenues, and thus materially and adversely affect our ability to service current debt and to pay distributions to securityholders. We could also be impacted by adverse developments in the Fairfield County, Connecticut and Westchester County, New York markets. We cannot assure you that these markets will grow or that underlying real estate fundamentals will be favorable to owners and operators of office or retail properties. Our operations may also be affected if competing properties are built in either of these markets.

Adverse economic and geopolitical conditions in general and in Manhattan and the greater New York metropolitan area commercial office and retail markets in particular, could have a material adverse effect on our results of operations, financial condition, ability to service debt and our ability to make distributions to our securityholders.

Our business may be affected by volatility and illiquidity in the financial and credit markets, a general global economic recession and other market or economic challenges experienced by the real estate industry or the U.S. economy as a whole. Our business may also be materially and adversely affected by local economic conditions, as substantially all of our revenues are derived from our properties located in Manhattan and the greater New York metropolitan area, particularly in Manhattan, Fairfield County and Westchester County.

Because our portfolio consists primarily of commercial office and retail buildings located principally in Manhattan, we are significantly more vulnerable to risks in these industries and in this geography than if we owned a more diversified real estate portfolio. In particular, the retail industry is facing reductions in sales revenues and increased bankruptcies throughout the United States.

General conditions that might materially and adversely affect our results of operations, financial condition, ability to service current debt and to make distributions to our securityholders include:

• the financial condition of our tenants, many of which are consumer goods, financial, legal and other professional firms, may be adversely affected, which may result in tenant defaults under leases due to bankruptcy, lack of liquidity, operational failures or other reasons;

• significant job losses in the financial and professional services industries have occurred and may continue to occur, which may decrease demand for our office space, causing market rental rates and property values to be impacted negatively;

• our ability to borrow on terms and conditions that we find acceptable, or at all, may be limited, which could reduce our ability to pursue acquisition and development opportunities, engage in our redevelopment and repositioning activities and refinance existing debt, reduce our returns from both our existing operations and our acquisition and development activities and increase our future interest expense;

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• reduced values of our properties may limit our ability to dispose of assets at attractive prices or to obtain debt financing secured by our properties and may reduce the availability of unsecured loans;

• reduced liquidity in debt markets and increased credit risk premiums for certain market participants may impair our ability to access capital or make such access more expensive; and

• the value and liquidity of our short-term investments and cash deposits could be reduced as a result of a deterioration of the financial condition of the institutions that hold our cash deposits or the institutions or assets in which we have made short-term investments, the dislocation of the markets for our short-term investments, increased volatility in market rates for such investments or other factors.

These conditions may continue or worsen in the future, which could materially and adversely affect our results of operations, financial condition and ability to make distributions to our securityholders.

There can be no assurance that our redevelopment and repositioning program will be completed in its entirety in accordance with the anticipated timing or at the anticipated cost, or that we will achieve the results we expect from our redevelopment and repositioning program, which could materially and adversely affect our financial condition and results of operations.

We have been undertaking a comprehensive redevelopment and repositioning program of our Manhattan office properties that has included the physical improvement through upgrades and modernization of, and tenant upgrades in, such properties. We may experience conditions which delay or preclude program completion. In addition, we may not be able to lease available space on favorable terms or at all. Further, our redevelopment and repositioning program may lead to temporary increased vacancy rates at the properties undergoing redevelopment. There can be no assurance that our redevelopment and repositioning program will be completed in its entirety in accordance with the anticipated timing or at the anticipated cost, or that we will achieve the results we expect from our redevelopment and repositioning program or that we will be able to achieve anticipated results which could materially and adversely affect our financial condition and results of operations.

We rely on six properties for a significant portion of our rental revenue.

For the year ended December 31, 2018, six of our properties, the Empire State Building, One Grand Central Place, 111 West 33rd Street, 1400 Broadway, First Stamford Place and 250 West 57th Street together accounted for approximately 72.2% of our portfolio’s rental revenues, and no other property accounted for more than approximately 5.0% of our portfolio’s rental revenues. For the year ended December 31, 2018, the Empire State Building individually accounted for approximately 31.9% of our portfolio’s rental revenues. Our revenue and cash available for distribution to our securityholders would be materially and adversely affected if the Empire State Building, One Grand Central Place, 111 West 33rd Street, 1400 Broadway, First Stamford Place or 250 West 57th Street were materially damaged or destroyed. Additionally, our revenue and cash available for distribution to our securityholders would be materially adversely affected if a significant number of our tenants at these properties experienced a downturn in their business which may weaken their financial condition and result in their failure to make timely rental payments, defaulting under their leases or filing for bankruptcy.

The observatory operations at the Empire State Building are not traditional real estate operations, and competition and changes in tourist trends and adverse weather, among other factors, may subject us to additional risks, which could have a material adverse effect on our results of operations, financial condition and ability to make distributions to our securityholders.

During the year ended December 31, 2018, we derived approximately $131.2 million of revenue from the Empire State Building’s observatory operations, representing approximately 39.0% of the Empire State Building’s total revenue for this period. The Empire State Building’s observatory is one of New York City’s main destination attractions and we have undertaken various projects to modernize and optimize visitor experience. We closed the 102nd floor of the Observatory experience beginning in January 2019 for upgrades that may take as long as nine months, and this will temporarily negatively impact Observatory revenue.  In addition, the Observatory redevelopment project may cause other disruptions to our visitor experience while we undergo construction, and as part of our ongoing operations once all of the improvements are made, which in each case may negatively impact Observatory revenue.

We currently compete against two existing observatories in New York City, and additional observatories are in the construction pipeline, with the Hudson Yards observatory projected to be completed in the first quarter 2020 and the One Vanderbilt observatory projected to be completed by year end 2020, which could have a negative impact on revenues from our observatory operations.  Despite the Empire State Building’s iconic status, location, and updated visitor experience, existing and new observatory competition may divert visitors from our observatory and negatively impact observatory revenue. Visitor demand for our observatory is highly dependent on domestic and overseas tourism. While New York City tourism has been consistent in recent years, economic and geopolitical factors might negatively impact tourist influx in the future. Additionally, we are susceptible to reductions in visitor demand due to adverse weather patterns, in particular during peak visitor periods.  Increased competition, a downturn in tourist trends and adverse weather may negatively impact visitor demand for our observatory, which could have a material adverse effect on our results of operations, financial condition and ability to make distributions to our securityholders.

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We may be unable to renew leases, lease vacant space or re-lease space on favorable terms or at all as leases expire, which could materially and adversely affect our financial condition, results of operations and cash flow.

As of December 31, 2018, we had approximately 0.8 million rentable square feet of vacant space (excluding leases signed but not yet commenced). In addition, leases representing 7.2% and 8.3% of the square footage of the properties in our portfolio will expire in 2019 and 2020, respectively (including month to month leases). We cannot assure you that expiring leases will be renewed or that our properties will be re-leased at net effective rental rates equal to or above the current average net effective rental rates. Above-market rental rates at some of the properties in our portfolio may force us to renew some expiring leases or re-lease properties at lower rates. If the rental rates of our properties decrease, our existing tenants do not renew their leases or we do not re-lease a significant portion of our available space and space for which leases will expire, our financial condition, results of operations, cash flow, per share/unit trading price of ESRT's Class A common stock and our traded OP units and our ability to satisfy our principal and interest obligations and to make distributions to our securityholders would be materially and adversely affected.

The actual rents we receive for the properties in our portfolio may be less than our asking rents, and we may experience a decline in realized rental rates from time to time, which could materially and adversely affect our financial condition, results of operations and cash flow.

As a result of various factors, including competitive pricing pressure in our markets, a general economic downturn and the desirability of our properties compared to other properties in our markets, we may be unable to realize our asking rents across the properties in our portfolio. In addition, the degree of discrepancy between our asking rents and the actual rents we are able to obtain may vary both from property to property and among different leased spaces within a single property. If we are unable to obtain sufficient rental rates across our portfolio, then our ability to generate cash flow growth will be negatively impacted. In addition, depending on market rental rates at any given time as compared to expiring leases in our portfolio, from time to time rental rates for expiring leases may be higher than starting rental rates for new leases.

We are exposed to risks associated with property redevelopment and development that could materially and adversely affect our financial condition and results of operations.

We have engaged, and continue to engage, in development and redevelopment activities with respect to our Manhattan office properties. In addition, we own entitled land at the Stamford Transportation Center in Stamford, Connecticut that can support the development of an approximately 380,000 rentable square foot office building and garage. To the extent that we continue to engage in development and redevelopment activities, we will be subject to certain risks, including, without limitation:

• the availability and pricing of financing on favorable terms or at all;

• the availability and timely receipt of zoning and other regulatory approvals;

• the potential for the fluctuation of occupancy rates and rents at properties due to a number of factors, including market and economic conditions, which may result in our investment not being profitable;

• start up, repositioning and redevelopment costs may be higher than anticipated;

• the cost and timely completion of construction (including risks beyond our control, such as weather or labor conditions, or material shortages);

• the potential that we may fail to recover expenses already incurred if we abandon development or redevelopment opportunities after we begin to explore them;

• the potential that we may expend funds on and devote management time to projects which we do not complete;

• the inability to complete construction and leasing of a property on schedule, resulting in increased debt service expense and construction or redevelopment costs; and

• the possibility that properties will be leased at below expected rental rates.

These risks could result in substantial unanticipated delays or expenses and, under certain circumstances, could prevent the initiation of development and redevelopment activities or the completion of development and redevelopment activities once undertaken, any of which could have an adverse effect on our financial condition, results of operations, cash flow, per share/unit trading price of ESRT's Class A common stock and our traded OP units and ability to satisfy our principal and interest obligations and to make distributions to our securityholders.

We may be required to make rent or other concessions and/or significant capital expenditures to improve our properties in order to retain and attract tenants, which could materially and adversely affect us, including our financial condition, results of operations and cash flow.

Upon expiration of leases at our properties and with respect to our current vacant space, we may be required to make rent or other concessions to tenants, accommodate increased requests for renovations, build-to-suit remodeling and other improvements or provide additional services to our tenants. In addition, eight of our existing properties are pre-war office properties, which may require more frequent and costly maintenance to retain existing tenants or attract new tenants than newer

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properties. As a result, we may have to make significant capital or other expenditures in order to retain tenants whose leases expire and to attract new tenants in sufficient numbers. Additionally, we may need to raise capital to make such expenditures. If we are unable to do so or capital is otherwise unavailable, we may be unable to make the required expenditures. This could result in non-renewals by tenants upon expiration of their leases and our vacant space remaining untenanted, which could materially and adversely affect our financial condition, results of operations, cash flow and per share/unit trading price of ESRT's Class A common stock and our traded OP units. As of December 31, 2018, we had approximately 0.8 million rentable square feet of vacant space (excluding leases signed but not yet commenced), and leases representing 7.2% and 8.3% of the square footage of the properties in our portfolio will expire in the in 2019 and 2020, respectively (including month to month leases).

We depend on significant tenants in our office portfolio, including Global Brands Group, Coty, Inc., LinkedIn, Sephora and PVH Corp., which together represented approximately 17.4% of our total portfolio’s annualized rent as of December 31, 2018.

As of December 31, 2018, our five largest tenants together represented 17.4% of our total portfolio’s annualized rent. As of December 31, 2018, our largest tenant leased an aggregate of 0.7 million rentable square feet of office space at two of our office properties, representing approximately 6.4% of the total rentable square feet and approximately 6.7% of the annualized rent in our portfolio. Our rental revenue depends on entering into leases with and collecting rents from tenants. General and regional economic conditions, may adversely affect our major tenants and potential tenants in our markets. Our major tenants may experience a material business downturn, weakening their financial condition and potentially resulting in their failure to make timely rental payments and/or a default under their leases. In many cases, we have made substantial up front investments in the applicable leases, through tenant improvement allowances and other concessions, as well as typical transaction costs (including professional fees and commissions) that we may not be able to recover. In the event of any tenant default, we may experience delays in enforcing our rights as landlord and may incur substantial costs in protecting our investment.

Our revenue and cash flow could be materially adversely affected if any of our significant tenants were to suffer a downturn in their business, default under their leases, fail to renew their leases at all or renew on terms less favorable to us than their current terms, or become bankrupt or insolvent.

The bankruptcy or insolvency of any of our tenants could result in the termination of such tenant’s lease and material losses to us.

The occurrence of a tenant bankruptcy or insolvency could diminish the income we receive from that tenant’s lease or leases. In particular, the retail industry is facing reductions in sales revenues and increased bankruptcies throughout the United States. If a tenant becomes bankrupt or insolvent, federal law may prohibit us from evicting such tenant based solely upon such bankruptcy or insolvency. In addition, a bankrupt or insolvent tenant may be authorized to reject and terminate its lease or leases with us. Any claims against such bankrupt tenant for unpaid future rent would be subject to statutory limitations that would likely result in our receipt of rental revenues that are substantially less than the contractually specified rent we are owed under the lease or leases. In addition, any claim we have for unpaid past rent, if any, may not be paid in full. We may also be unable to re-lease a terminated or rejected space or to re-lease it on comparable or more favorable terms. As a result, tenant bankruptcies may materially and adversely affect us.

Competition may impede our ability to attract or retain tenants or re-let space, which could materially and adversely affect our results of operations and cash flow.

The leasing of real estate in the greater New York metropolitan area is highly competitive. The principal means of competition are rent charged, location, services provided and the nature and condition of the premises to be leased. We directly compete with all lessors and developers of similar space in the areas in which our properties are located as well as properties in other submarkets. We also see competition from lessors that convert traditional office space to co-working office availabilities. Demand for retail space may be impacted by the bankruptcy of retail companies, a general trend toward consolidation in the retail industry, and the impact of internet retailing which could adversely affect the ability of our company to attract and retain tenants, which could (i) reduce rents payable to us, (ii) reduce our ability to attract and retain tenants at our properties and (iii) lead to increased vacancy rates at our properties, any of which could materially and adversely affect us.

Our office properties are concentrated in highly developed areas of midtown Manhattan and densely populated metropolitan communities in Fairfield County and Westchester County. Manhattan is the largest office market in the United States. The number of competitive office properties in the markets in which our properties are located (which may be newer or better located than our properties) could have a material adverse effect on our ability to lease office space at our properties, and on the effective rents we are able to charge.

If our tenants are unable to secure financing necessary to continue to operate their businesses and pay us rent, we could be materially and adversely affected.

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Many of our tenants rely on external sources of financing to operate their businesses. If our tenants are unable to secure financing necessary to continue to operate their businesses, they may be unable to meet their rent obligations or be forced to declare bankruptcy and reject their leases, which could materially and adversely affect us.

Our dependence on smaller businesses to rent our office space could materially and adversely affect our cash flow and results of operations.

A large number of the tenants in our properties (measured by number of tenants as opposed to aggregate square footage) are smaller businesses that generally do not have the financial strength of larger corporate tenants. Smaller companies generally experience a higher rate of failure than large businesses. There is a current risk with these companies of a higher rate of tenant defaults, turnover and bankruptcies, which could materially and adversely affect our distributable cash flow and results of operations.

Our dependence on rental income may materially and adversely affect our cash flow and results of operations.

A substantial portion of our income is derived from rental income from real property. As a result, our performance depends on our ability to collect rent from tenants. Our income and funds for distribution would be negatively affected if a significant number of our tenants, or any of our major tenants (as discussed in more detail below):

• delay lease commencements;

• decline to extend or renew leases upon expiration;

• fail to make rental payments when due; or

• declare bankruptcy.

Any of these actions could result in the termination of the tenants’ leases and the loss of rental income attributable to the terminated leases. In these events, we cannot be sure that any tenant whose lease expires will renew that lease or that we will be able to re-lease space on economically advantageous terms or at all. The loss of rental revenues from a number of our tenants and our inability to replace such tenants may adversely affect our profitability, our ability to meet debt and other financial obligations and our ability to make distributions to our securityholders.

The broadcasting operations at the Empire State Building are not traditional real estate operations, and competition and changes in the broadcasting of signals over air may subject us to additional risks, which could materially and adversely affect us.

The Empire State Building and its broadcasting mast provides radio and data communications services and supports delivery of broadcasting signals to cable and satellite systems and television and radio receivers. We license the use of the broadcasting mast to third party television and radio broadcasters. During the year ended December 31, 2018, we derived approximately $19.5 million of revenue (excluding tenant reimbursement income) from the Empire State Building’s broadcasting licenses and related leased space, representing approximately 5.8% of the Empire State Building’s total revenue for this period. Competition from other broadcasting operations has had a negative impact on revenues from our broadcasting operations, and lease renewals have yielded reduced revenue, higher operating expenses and higher capital expenditures. Our broadcast television and radio licensees also face a range of competition from advances in technologies and alternative methods of content delivery in their respective industries, as well as from changes in consumer behavior driven by new technologies and methods of content delivery, which may reduce the demand for over-the-air broadcast licenses in the future. New government regulations affecting broadcasters, including the implementation of the Federal Communications Commission's (the "FCC") National Broadband Plan, (the "FCC Plan"), also might materially and adversely affect our results of operations by reducing the demand for broadcast licenses. Among other things, the FCC Plan urges Congress to make more spectrum available for wireless broadband service providers by encouraging over-the-air broadcast licensees to relinquish spectrum through a voluntary auction process, which raises many issues that could impact the broadcast industry. At this time we cannot predict whether Congress or the FCC will adopt or implement any of the FCC Plan’s recommendations or the rule changes as proposed, or how any such actions might affect our broadcasting operations. Any of these risks might materially and adversely affect us.

We may not be able to control our operating costs, or our expenses may remain constant or increase, even if income from our properties decreases, causing our results of operations to be adversely affected.

Our financial results depend substantially on leasing space in our properties to tenants on terms favorable to us. Costs associated with real estate investment, such as real estate taxes, insurance and maintenance costs, generally are not reduced even when a property is not fully occupied, rental rates decrease or other circumstances cause a reduction in income from the property. As a result, cash flow from the operations of our properties may be reduced if a tenant does not pay its rent or we are unable to rent our properties on favorable terms. Under those circumstances, we might not be able to enforce our rights as landlord without delays and may incur substantial legal costs. The terms of our leases may also limit our ability to charge our tenants for all or a portion of these expenses. Additionally, new properties that we may acquire or redevelop may not produce significant revenue immediately, and the cash flow from existing operations may be insufficient to pay the operating expenses and principal and interest on debt associated with such properties until they are fully leased.

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Our breach of or the expiration of our ground leases could materially and adversely affect our results of operations.

Our interest in three of our commercial office properties, 1350 Broadway, 111 West 33rd Street and 1400 Broadway are long-term leaseholds of the land and the improvements, rather than a fee interest in the land and the improvements. If we are found to be in breach of these ground leases, we could lose the right to use the properties. In addition, unless we purchase the underlying fee interest in these properties or extend the terms of our leases for these properties before expiration on terms significantly comparable to our current leases, we will lose our right to operate these properties and our leasehold interests in these properties upon expiration of the leases or we will continue to operate them at much lower profitability, which would significantly adversely affect our results of operations. In addition, if we are perceived to have breached the terms of these leases, the fee owner may initiate proceedings to terminate the leases. The long-term leases, including unilateral extension rights available to us, expire on July 31, 2050 for 1350 Broadway, December 31, 2063 for 1400 Broadway and June 10, 2077 for 111 West 33rd Street.

Pursuant to the ground leases, we, as tenant under the ground leases, perform the functions traditionally performed by owners, as landlords, with respect to our subtenants. In addition to collecting rent from our subtenants, we also maintain the properties and pay expenses relating to the properties. We do not have a right, pursuant to the terms of our leases or otherwise, to acquire the fee interests in these properties.

We will not recognize any increase in the value of the land or improvements subject to our ground leases, and we may only receive a portion of compensation paid in any eminent domain proceeding with respect to these properties, which could materially and adversely affect us.

We have no economic interest in the land or improvements at the expiration of our ground leases at 1350 Broadway, 111 West 33rd Street and 1400 Broadway, and therefore we will not share in any increase in value of the land or improvements beyond the term of our ground leases, notwithstanding our capital outlay to purchase our interest in the properties. Furthermore, if the state or federal government seizes the properties subject to the ground leases under its eminent domain power, we may only be entitled to a portion of any compensation awarded for the seizure. In addition, if the value of the properties has increased, it may be more expensive for us to renew our ground leases.

We may be unable to identify and successfully complete acquisitions and even if acquisitions are identified and completed, we may fail to operate successfully acquired properties, which could materially and adversely affect us and impede our growth.

Our current portfolio consists entirely of properties that we acquired (or received the right to acquire) in connection with the formation transactions. Our ability to identify and acquire additional properties on favorable terms and successfully operate or redevelop them may be exposed to the following significant risks:

• even if we enter into agreements for the acquisition of properties, these agreements are subject to customary conditions to closing, including completion of due diligence investigations to our satisfaction and other conditions that are not within our control, which may not be satisfied, and we may be unable to complete an acquisition after making a non-refundable deposit and incurring certain other acquisition-related costs;

• we may be unable to finance the acquisition on favorable terms in the time period we desire, or at all;

• we may spend more than budgeted to make necessary improvements or redevelopments to acquired properties;

• we may not be able to obtain adequate insurance coverage for new properties;

• acquired properties may be located in new markets where we may face risks associated with a lack of market knowledge or understanding of the local economy, lack of business relationships in the area and unfamiliarity with local governmental and permitting procedures;

• we may be unable to integrate quickly and efficiently new acquisitions, particularly acquisitions of portfolios of properties, into our existing operations, and as a result our results of operations and financial condition could be adversely affected;

• market conditions may result in higher than expected vacancy rates and lower than expected rental rates; and

• we may incur significant costs and divert management attention in connection with evaluating and negotiating potential acquisitions, including ones that we are subsequently unable to complete.

Any delay or failure on our part to identify, negotiate, finance and consummate such acquisitions in a timely manner and on favorable terms, or operate acquired properties to meet our financial expectations, could impede our growth and adversely affect our financial condition, results of operations, cash flow and per share/unit trading price of ESRT's Class A common stock and our traded OP units.

Competition for acquisitions may reduce the number of acquisition opportunities available to us and increase the costs of those acquisitions, which may impede our growth.

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We plan to acquire properties as we are presented with attractive opportunities. We may face significant competition for acquisition opportunities in the greater New York metropolitan area with other investors, particularly private investors who can incur more leverage, and this competition may adversely affect us by subjecting us to the following risks:

• an inability to acquire a desired property because of competition from other well-capitalized real estate investors, including publicly traded and privately held REITs, private real estate funds, domestic and foreign financial institutions, life insurance companies, sovereign wealth funds, pension trusts, commercial developers, partnerships and individual investors; and

• an increase in the purchase price for such acquisition property, in the event we are able to acquire such desired property.

The significant competition for acquisitions of commercial office and retail properties in the greater New York metropolitan area may impede our growth.

Acquired properties may expose us to unknown liability, which could adversely affect our results of operations, cash flow and the market value of our securities.

We may acquire properties subject to liabilities and without any recourse, or with only limited recourse, against the prior owners or other third parties with respect to unknown liabilities. As a result, if a liability were asserted against us based upon ownership of those properties, we might have to pay substantial sums to settle or contest it, which could adversely affect our results of operations, cash flow and the market value of our securities. Unknown liabilities with respect to acquired properties might include:

• liabilities for clean-up of undisclosed environmental contamination;

• claims by tenants, vendors or other persons against the former owners of the properties;

• liabilities incurred in the ordinary course of business; and

• claims for indemnification by general partners, directors, officers and others indemnified by the former owners of the properties.

We may acquire properties or portfolios of properties through tax deferred contribution transactions, which could result in securityholder dilution and limit our ability to sell such assets.

In the future we may acquire properties or portfolios of properties through tax deferred contribution transactions in exchange for partnership interests in our company, which may result in dilution to securityholders. This acquisition structure may have the effect of, among other things, reducing the amount of tax depreciation we could deduct over the tax life of the acquired properties, and may require that we agree to protect the contributors’ ability to defer recognition of taxable gain through restrictions on our ability to dispose of the acquired properties and/or the allocation of partnership debt to the contributors to maintain their tax bases. These restrictions could limit our ability to sell an asset at a time, or on terms, that would be favorable absent such restrictions.

Should we decide at some point in the future to expand into new markets, we may not be successful, which could adversely affect our financial condition, result of operations, cash flow and trading price of ESRT's Class A common stock and our traded OP units.

If opportunities arise, we may explore acquisitions of properties in new markets. Each of the risks applicable to our ability to acquire and integrate successfully and operate properties in our current markets is also applicable to our ability to acquire and integrate successfully and operate properties in new markets. In addition to these risks, we will not possess the same level of familiarity with the dynamics and market conditions of any new markets that we may enter, which could adversely affect the results of our expansion into those markets, and we may be unable to build a significant market share or achieve a desired return on our investments in new markets. If we are unsuccessful in expanding into new markets, it could adversely affect our financial condition, results of operations, cash flow, trading price of ESRT's Class A common stock and our traded OP units and ability to satisfy our principal and interest obligations and to make distributions to our securityholders.

Our growth depends on external sources of capital that are outside of our control, which may affect our ability to seize strategic opportunities, satisfy debt obligations and make distributions to our securityholders.

In order for ESRT to qualify as a REIT, it must distribute to its securityholders, on an annual basis, at least 90% of its REIT taxable income, determined without regard to the deduction for distributions paid and excluding net capital gains. In addition, it will be subject to U.S. federal income tax at the generally applicable corporate tax rate 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

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excise tax on the amount by which its distributions in any calendar year are less than a minimum amount specified under U.S. federal income tax laws. Our partnership agreement provides that we will make sufficient distributions to ESRT to enable it to satisfy these distribution requirements and to avoid U.S. federal corporate income tax and the 4% excise tax. Because of these distribution requirements, we may not be able to fund future capital needs, including any necessary acquisition financing, from operating cash flow. Consequently, we may need to rely on third-party sources to fund our capital needs. We may not be able to obtain financing on favorable terms, in the time period we desire, or at all. Any additional debt we incur will increase our leverage. Our access to third-party sources of capital depends, in part, on:

• general market conditions;

• the market’s perception of our growth potential;

• our current debt levels;

• our current and expected future earnings;

• our cash flow and cash distributions; and

• the market price per share/unit of ESRT's Class A common stock and our traded OP units.

If we cannot obtain capital from third-party sources, we may not be able to acquire or redevelop properties when strategic opportunities exist, satisfy our principal and interest obligations or make the cash distributions to our securityholders necessary to maintain ESRT's qualification as a REIT.

If we are unable to sell, dispose of or refinance one or more properties in the future, we may be unable to realize our investment objectives, and our business may be adversely affected.

The real estate investments made, and to be made, by us are relatively difficult to sell quickly. Return of capital and realization of gains from an investment generally will occur upon disposition or refinancing of the underlying property. In addition, the Internal Revenue Code of 1986, as amended (the "Code"), imposes restrictions on the ability of a REIT to dispose of properties that are not applicable to other types of real estate companies, which limit our ability to sell properties without adversely affecting ESRT. We may be unable to realize our investment objectives by sale, other disposition or refinancing at attractive prices within any given period of time or may otherwise be unable to complete any exit strategy. In particular, these risks could arise from weakness in or even the lack of an established market for a property, changes in the financial condition or prospects of prospective purchasers, changes in national or international economic conditions and changes in laws, regulations or fiscal policies of jurisdictions in which our properties are located.

Our outstanding indebtedness, including preferred units, reduces cash available for distribution and may expose us to the risk of default under our debt obligations and may include covenants that restrict our financial and operational flexibility and our ability to make distributions.

As of December 31, 2018, we had total debt outstanding of approximately $1.9 billion. As of December 31, 2018, we had approximately $250.0 million of debt maturing in 2019 and no debt maturing in 2020. As of December 31, 2018, our mortgages had an aggregate estimated principal balance of approximately $614.6 million with maturity dates ranging from 2024 through 2033. See Note 4 to our consolidated financial statements for required payments of our indebtedness. We may incur significant additional debt to finance future acquisition and redevelopment activities. Payments of principal and interest on borrowings may leave us with insufficient cash resources to operate our properties or to pay the distributions currently contemplated or necessary to allow ESRT to qualify as a REIT. Our level of debt and the limitations imposed on us by our loan documents could have significant adverse consequences, including the following:

• our cash flow may be insufficient to meet our required principal and interest payments;

• we may be unable to borrow additional funds as needed or on favorable terms;

• we may be unable to refinance our indebtedness at maturity or the refinancing terms may be less favorable than the terms of our original indebtedness;

• to the extent we borrow debt that bears interest at variable rates, increases in interest rates could materially increase our interest expense;

• we may be forced to dispose of one or more of our properties, possibly on disadvantageous terms;

• we may default on our obligations or violate restrictive covenants, in which case the lenders or mortgagees may accelerate our debt obligations, foreclose on the properties that secure their loans and/or take control of our properties that secure their loans and collect rents and other property income;

• we may violate restrictive covenants in our loan documents, which would entitle the lenders to accelerate our debt obligations or reduce our ability to make, or prohibit us from making, distributions; and

• our default under any one of our mortgage loans with cross default provisions could result in a default on other indebtedness.

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In addition, our unsecured revolving credit and term loan facility and our Senior Unsecured Notes require us to maintain designated ratios, including but not limited to, total debt-to-assets, secured debt-to-assets, adjusted EBITDA to consolidated fixed charges, net operating income from unencumbered properties to interest expense on unsecured debt, and unsecured debt to unencumbered assets, and contain a minimum tangible net worth requirement. Our unsecured revolving credit and term loan facility and our Senior Unsecured Notes do not generally contain restrictions on the payment of dividends or other distributions. The indenture governing our outstanding senior unsecured notes - exchangeable does not contain financial or operational covenants or restrictions on the payments of dividends; however, upon the occurrence of fundamental changes described in the indenture, holders of our outstanding senior unsecured notes - exchangeable may require our operating partnership to repurchase for cash all or part of their notes at a repurchase price equal to 100% of the principal amount of the notes to be repurchased, plus accrued and unpaid interest, subject to certain conditions. Further, upon the occurrence of any make-whole fundamental change described in the indenture, the exchange rate for holders who exchange their notes in connection with any such make-whole fundamental change may be increased. See "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations - Liquidity and Capital Resources."

The provisions in the partnership agreement of our operating partnership that govern the preferred units may restrict our ability to pay dividends if we fail to pay the cumulative preferential cash distributions thereon. See "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations - Private Perpetual Preferred Units.”

If any one of these events were to occur, our financial condition, results of operations, cash flow, per share/unit trading price of ESRT's Class A common stock and our traded OP units and our ability to satisfy our principal, interest and preferred unit distribution obligations and to make distributions to our securityholders could be adversely affected. In addition, in connection with our debt agreements we may enter into lockbox and cash management agreements pursuant to which substantially all of the income generated by our properties will be deposited directly into lockbox accounts and then swept into cash management accounts for the benefit of our various lenders and from which cash will be distributed to us only after funding of improvement, leasing and maintenance reserves and the payment of principal and interest on our debt, insurance, taxes, operating expenses and extraordinary capital expenditures and leasing expenses. As a result, we may be forced to borrow additional funds in order to make distributions to our securityholders (including, potentially, to make distributions necessary to allow ESRT satisfy the requirements applicable to REITs). See "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations - Liquidity and Capital Resources."

Our degree of leverage and the lack of a limitation on the amount of indebtedness we may incur could materially and adversely affect us.

Neither our nor ESRT's organizational documents contain any limitation on the amount of indebtedness we may incur. We consider factors other than debt-to-EBITDA in making decisions regarding the incurrence of indebtedness, such as the purchase price of properties to be acquired with debt financing, the estimated market value of our properties upon refinancing and the ability of particular properties and our business as a whole to generate cash flow to cover expected debt service.

Our degree of leverage could affect our ability to obtain additional financing for working capital, capital expenditures, acquisitions, development or other general corporate purposes. Our degree of leverage could also make us more vulnerable to a downturn in business or the economy generally. If we become more leveraged in the future, the resulting increase in debt service requirements could cause us to default on our obligations, which could materially and adversely affect us.

Mortgage debt obligations expose us to the possibility of foreclosure, which could result in the loss of our investment in a property or group of properties subject to mortgage debt.

Incurring mortgage and other secured debt obligations increases our risk of property losses because defaults on indebtedness secured by properties may result in foreclosure actions initiated by lenders and ultimately our loss of the property securing any loans for which we are in default. Any foreclosure on a mortgaged property or group of properties could adversely affect the overall value of our portfolio of properties. For tax purposes, a foreclosure of any of our properties that is subject to a nonrecourse mortgage loan would be treated as a sale of the property for a purchase price equal to the outstanding balance of the debt secured by the mortgage. If the outstanding balance of the debt secured by the mortgage exceeds our tax basis in the property, we would recognize taxable income on foreclosure, but would not receive any cash proceeds, which could hinder our ability to make distributions to ESRT in order to allow it to meet the distribution requirements applicable to REITs under the Code. Foreclosures could also trigger our tax indemnification obligations under the terms of our agreements with certain continuing investors with respect to sales of certain properties, and obligate us to make certain levels of indebtedness available for them to guarantee which, among other things, allows them to defer the recognition of gain in connection with the formation transactions.

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High mortgage rates and/or unavailability of mortgage debt may make it difficult for us to finance or refinance properties, which could reduce the number of properties we can acquire, our net income and the amount of cash distributions we can make.

If mortgage debt is unavailable at reasonable rates, we may not be able to finance the purchase of properties. If we place mortgage debt on properties, we may be unable to refinance the properties when the loans become due, or to refinance on favorable terms. If interest rates are higher when we refinance our properties, our income could be reduced. If any of these events occur, our cash flow could be reduced. This, in turn, could reduce cash available for distribution to our securityholders and may hinder our ability to raise more capital by issuing more stock or by borrowing more money. In addition, to the extent we are unable to refinance the properties when the loans become due, we will have fewer debt guarantee opportunities available to offer under our tax protection agreement. If we are unable to offer certain guarantee opportunities to the protected parties under the tax protection agreement, or otherwise are unable to allocate sufficient liabilities of our company to those parties, it could trigger an indemnification obligation of our company under the tax protection agreement.

Some of our financing arrangements involve balloon payment obligations, which may adversely affect our ability to make distributions.

As some of our financing arrangements require us to make a lump-sum or "balloon" payment at maturity. Our ability to make a balloon payment at maturity is uncertain and may depend upon our ability to obtain additional financing or our ability to sell the property. At the time the balloon payment is due, we may or may not be able to refinance the existing financing on terms as favorable as the original loan or sell the property at a price sufficient to make the balloon payment. The effect of a refinancing or sale could affect the rate of return to securityholders and the projected time of disposition of our assets. In addition, payments of principal and interest made to service our debts may leave us with insufficient cash to make distributions necessary to allow ESRT to meet the distribution requirements applicable to REITs under the Code.

Our tax protection agreements could limit our ability either to sell certain properties or to engage in a strategic transaction, or to reduce our level of indebtedness, which could materially and adversely affect us.

In connection with the formation transactions, we and ESRT entered into a tax protection agreement with Anthony E. Malkin and Peter L. Malkin pursuant to which we have agreed to indemnify the Malkin Group and one additional third party investor in Metro Center (who was one of the original landowners and was involved in the development of the property) against certain tax liabilities if those tax liabilities result from (i) our sale, transfer, conveyance, or other taxable disposition of four specified properties (First Stamford Place, Metro Center, 10 Bank Street and 1542 Third Avenue) acquired by us in 2013 for a period of 12 years with respect to First Stamford Place and for the later of (x) October 2021 or (y) the death of both Peter L. Malkin and Isabel W. Malkin who are 85 and 82 years old, respectively, for the three other properties, (ii) our failing to maintain until maturity the indebtedness secured by those properties or failing to use commercially reasonable efforts to refinance such indebtedness upon maturity in an amount equal to the principal balance of such indebtedness, or, if we are unable to refinance such indebtedness at its current principal amount, at the highest principal amount possible, or (iii) our failing to make available to any of these continuing investors the opportunity to guarantee, or otherwise bear the risk of loss, for U.S. federal income tax purposes, of their allocable share of $160 million of aggregate indebtedness meeting certain requirements, until such continuing investor owns less than the aggregate number of operating partnership units and shares of ESRT common stock equal to 50% of the aggregate number of such units and shares such continuing investor received in the formation transactions. In addition, in connection with our and ESRT's sale of a 9.9% fully diluted interest in us to Q REIT Holding LLC, a Qatar Financial Centre limited liability company and a wholly owned subsidiary of the Qatar Investment Authority, a governmental authority of the State of Qatar ("QREIT", and together with any eligible transferee, "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 payable 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 would be required to pay damages for the resulting tax consequences to the Malkin Group, the additional third party investor in Metro Center or QIA, as applicable, and we have acknowledged that a calculation of damages with respect to the tax protection agreement with the Malkin Group and the additional third party investor in Metro Center will not be based on the time value of money or the time remaining within the restricted period. Moreover, these obligations may restrict our and ESRT's ability to engage in a strategic transaction, require us to maintain more or different indebtedness than we would otherwise require for our business, and/or inhibit our selling or disposing of a property that might otherwise be in the best interest of the securityholders to do so.

We face risks which would arise if any of our tenants were designated “Prohibited Persons” by the Office of Foreign Assets Control.

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Pursuant to Executive Order 13224 and other laws, the Office of Foreign Assets Control of the United States Department of the Treasury (“OFAC”) maintains a list of persons designated as terrorists or who are otherwise blocked or banned (“Prohibited Persons”). OFAC regulations and other laws prohibit us from conducting business or engaging in transactions with Prohibited Persons (the “OFAC Requirements”).  We have established a compliance program whereby tenants are checked against the OFAC list of Prohibited Persons prior to entering into any lease.  Our leases and other agreements, in general, require the other party to comply with OFAC Requirements.  If a tenant or other party with whom we contract is placed on the OFAC list or is otherwise a party with which we are prohibited from doing business, we may be required by the OFAC Requirements to terminate the lease or other agreement.  Any such termination could result in a loss of revenue or otherwise negatively affect our financial results and cash flows.

The continuing threat of a terrorist event may materially and adversely affect our properties, their value and our ability to generate cash flow.

There may be a decrease in demand for space in Manhattan and the greater New York metropolitan area because it is considered at risk for a future terrorist event, and this decrease may reduce our revenues from property rentals. In the aftermath of a terrorist event, tenants in Manhattan and the greater New York metropolitan area may choose to relocate their businesses to less populated, lower-profile areas of the United States that are not as likely to be targets of future terrorist activity. This in turn could trigger a decrease in the demand for space in Manhattan and the greater New York metropolitan area, which could increase vacancies in our properties and force us to lease our properties on less favorable terms. Further, certain of our properties, including the Empire State Building, may be considered to be susceptible to increased risks of a future terrorist event due to the high-profile nature of the property. In addition, a terrorist event could cause insurance premiums at certain of our properties to increase significantly. As a result, the value of our properties and the level of our revenues could materially decline.

Potential losses, such as those from adverse weather conditions, natural disasters, possible rise in ocean levels, terrorist events and title claims, may not be fully covered by our insurance policies, and such losses could materially and adversely affect us.

Our business operations are susceptible to, and could be significantly affected by, adverse weather conditions, terrorist events, possible rise in ocean levels and natural disasters that could cause significant damage to the properties in our portfolio. Our insurance may not be adequate to cover business interruption or losses resulting from such events. In addition, our insurance policies include substantial self-insurance portions and significant deductibles and co-payments for such events, and hurricanes in the United States have affected the availability and price of such insurance. As a result, we may incur significant costs in the event of adverse weather conditions, terrorist events and natural disasters. We may discontinue certain insurance coverage on some or all of our properties in the future if the cost of premiums for any of these policies in our judgment exceeds the value of the coverage discounted for the risk of loss. See "Item 1. Business - Insurance."

Furthermore, we do not carry insurance for certain losses, including, but not limited to, losses caused by war. In addition, while our title insurance policies insure for the current aggregate market value of our portfolio, we do not intend to increase our title insurance policies as the market value of our portfolio increases. As a result, we may not have sufficient coverage against all losses that we may experience, including from adverse title claims.

If we experience a loss that is uninsured or which exceeds our policy limits, we could incur significant costs and lose the capital invested in the damaged properties as well as the anticipated future cash flows from those properties. In addition, if the damaged properties are subject to recourse indebtedness, we would continue to be liable for the indebtedness, even if these properties were irreparably damaged.

In addition, certain of our properties could not be rebuilt to their existing height or size at their existing location under current land-use laws and policies. In the event that we experience a substantial or comprehensive loss of one of our properties, we may not be able to rebuild such property to its existing specifications and otherwise may have to upgrade such property to meet current code requirements.

Our debt instruments, consisting of mortgage loans secured by our properties (which are generally non-recourse to us), ground leases, our senior unsecured debt and our unsecured revolving credit and term loan facility, contain customary covenants requiring us to maintain insurance, including terrorism insurance. While we do not believe it will be likely, there can be no assurance that the lenders or ground lessors under these instruments will not take the position that a total or partial exclusion from “all-risk” insurance coverage for losses due to terrorist acts is a breach of these debt and ground lease instruments that allows the lenders or ground lessors to declare an event of default and accelerate repayment of debt or

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recapture of ground lease positions for those properties in our portfolio which are not insured against terrorist events. In addition, if lenders insist on full coverage for these risks and prevail in asserting that we are required to maintain such coverage, it could result in substantially higher insurance premiums.

Certain mortgages on our properties contain requirements concerning the financial ratings of the insurers who provide policies covering the property. We provide the lenders on a regular basis with the identity of the insurance companies in our insurance programs. While the ratings of our insurers currently satisfy the rating requirements in some of our loan agreements, in the future, we may be unable to obtain insurance with insurers which satisfy the rating requirements which could give rise to an event of default under such loan agreements. Additionally, in the future our ability to obtain debt financing secured by individual properties, or the terms of such financing, may be adversely affected if lenders generally insist on ratings for insurers which are difficult to obtain or which result in a commercially unreasonable premium.

We may become subject to liability relating to environmental and health and safety matters, which could have a material and adverse effect on us.

Under various federal, state and/or local laws, ordinances and regulations, as a current or former owner or operator of real property, we may be liable for costs and damages resulting from the presence or release of hazardous substances, waste, or petroleum products at, on, in, under or from such property, including costs for investigation or remediation, natural resource damages, or third party liability for personal injury or property damage. These laws often impose liability without regard to whether the owner or operator knew of, or was responsible for, the presence or release of such materials, and the liability may be joint and several. Some of our properties have been or may be impacted by contamination arising from current or prior uses of the property or adjacent properties for commercial, industrial or other purposes. Such contamination may arise from spills of petroleum or hazardous substances or releases from tanks used to store such materials. We also may be liable for the costs of remediating contamination at off-site disposal or treatment facilities when we arrange for disposal or treatment of hazardous substances at such facilities, without regard to whether we comply with environmental laws in doing so. The presence of contamination or the failure to remediate contamination on our properties may adversely affect our ability to attract and/or retain tenants and our ability to develop or sell or borrow against those properties. In addition to potential liability for cleanup costs, private plaintiffs may bring claims for personal injury, property damage or for similar reasons. Environmental laws also may create liens on contaminated sites in favor of the government for damages and costs it incurs to address such contamination. Moreover, if contamination is discovered on our properties, environmental laws may impose restrictions on the manner in which that property may be used or how businesses may be operated on that property. For example, our property at 69-97 Main Street is subject to an Environmental Land Use Restriction that imposes certain restrictions on the use, occupancy and activities of the affected land beneath the property. This restriction may prevent us from conducting certain redevelopment activities at the property, which may adversely affect its resale value and may adversely affect our ability to finance or refinance this property. See “Item 1. Business - Environmental Matters.”

Some of our properties are adjacent to or near other properties used for industrial or commercial purposes or that have contained or currently contain underground storage tanks used to store petroleum products or other hazardous or toxic substances. Releases from these properties could impact our properties. In addition, some of our properties have previously been used by former owners or tenants for commercial or industrial activities, e.g., gas stations and dry cleaners, and a portion of the Metro Tower site is currently used for automobile parking and fueling, that may release petroleum products or other hazardous or toxic substances at such properties or to surrounding properties.

In addition, our properties are subject to various federal, state and local environmental and health and safety laws and regulations. Noncompliance with these environmental and health and safety laws and regulations could subject us or our tenants to liability. These liabilities could affect a tenant’s ability to make rental payments to us. Moreover, changes in laws could increase the potential costs of compliance with such laws and regulations or increase liability for noncompliance. This may result in significant unanticipated expenditures or may otherwise materially and adversely affect our operations, or those of our tenants, which could in turn have a material adverse effect on us.

As the owner or operator of real property, we may also incur liability based on various building conditions. For example, buildings and other structures on properties that we currently own or operate or those we acquire or operate in the future contain, may contain, or may have contained, asbestos-containing material, or ACM. Environmental and health and safety laws require that ACM be properly managed and maintained and may impose fines or penalties on owners, operators or employers for non-compliance with those requirements. These requirements include special precautions, such as removal, abatement or air monitoring, if ACM would be disturbed during maintenance, redevelopment or demolition of a building, potentially resulting in substantial costs. In addition, we may be subject to liability for personal injury or property damage sustained as a result of releases of ACM into the environment.

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In addition, our properties may contain or develop harmful mold or suffer from other indoor air quality issues, which could lead to liability for adverse health effects or property damage or costs for remediation. When excessive moisture accumulates in buildings or on building materials, mold growth may occur, particularly if the moisture problem remains undiscovered or is not addressed over a period of time. Some molds may produce airborne toxins or irritants. Indoor air quality issues can also stem from inadequate ventilation, chemical contamination from indoor or outdoor sources, and other biological contaminants such as pollen, viruses and bacteria. Indoor exposure to airborne toxins or irritants above certain levels can be alleged to cause a variety of adverse health effects and symptoms, including allergic or other reactions. As a result, the presence of significant mold or other airborne contaminants at any of our properties could require us to undertake a costly remediation program to contain or remove the mold or other airborne contaminants from the affected property or increase indoor ventilation. In addition, the presence of significant mold or other airborne contaminants could expose us to liability from our tenants, employees of our tenants or others if property damage or personal injury occurs.

We cannot assure you that costs or liabilities incurred as a result of environmental issues will not affect our ability to make distributions to our securityholders or that such costs, liabilities, or other remedial measures will not have a material adverse effect on our financial condition and results of operations.

Monetary policy actions by the U.S Federal Reserve could adversely impact our financial condition and our ability to make distributions to our securityholders.

During 2018, the U.S. Federal Reserve raised the target range for the federal funds rate to a range from 1.50 to 2.50 percent compared to a range from 0.75 to 1.50 in 2017. These decisions ended the low-interest-rate policy that had been in effect in previous years. The targeted federal funds rate increase will likely result in an increase in market interest rates, which may increase our interest expense under our unhedged variable-rate borrowings and the costs of refinancing existing indebtedness or obtaining new debt. In addition, increases in market interest rates may result in a decrease in the value of our real estate and a decrease in the market price of ESRT's common stock and our securities. Increases in market interest rates may also adversely affect the securities markets generally, which could reduce the market price of ESRT's common stock and the price of our securities without regard to our operating performance. Any such unfavorable changes to our borrowing costs and the price of our securities could significantly impact our ability to raise new debt and equity capital going forward.

Failure to hedge interest rates effectively could have a material and adverse effect on us.

We may seek to manage our exposure to interest rate volatility by using interest rate hedging arrangements that involve risk, such as the risk that counterparties may fail to honor their obligations under these arrangements, and that these arrangements may not be effective in reducing our exposure to interest rate changes. Moreover, there can be no assurance that our hedging arrangements will qualify for hedge accounting or that our hedging activities will have the desired beneficial impact on our results of operations. Should we desire to terminate a hedging agreement, there could be significant costs and cash requirements involved to fulfill our initial obligation under the hedging agreement. Failure to hedge effectively against interest rate changes may adversely affect our results of operations.

When a hedging agreement is required under the terms of a mortgage loan, it is often a condition that the hedge counterparty maintains a specified credit rating. When there is volatility in the financial markets, there is an increased risk that hedge counterparties could have their credit rating downgraded to a level that would not be acceptable under the loan provisions. If we were unable to renegotiate the credit rating condition with the lender or find an alternative counterparty with acceptable credit rating, we could be in default under the loan and the lender could seize that property through foreclosure.

We may incur significant costs complying with the ADA and similar laws, which could adversely affect our financial condition, results of operations, cash flow and per share/unit trading price of ESRT's Class A common stock and our traded OP units.

Under the Americans with Disabilities Act of 1990, or the ADA, all public accommodations must meet federal requirements related to access and use by disabled persons. If one or more of the properties in our portfolio is not in compliance with the ADA, we would be required to incur additional costs to bring the property into compliance. Additional federal, state and local laws also may require modifications to our properties, or restrict our ability to renovate our properties. We cannot predict the ultimate cost of compliance with the ADA or other legislation. If we incur substantial costs to comply with the ADA and any other legislation, our financial condition, results of operations, cash flow, per share/unit trading price of ESRT's Class A common stock and our traded OP units and our ability to satisfy our principal and interest obligations and to make distributions to our securityholders could be adversely affected.

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Our state and local taxes could increase due to property tax rate changes, reassessment and/or changes in state and local tax laws which could impact our cash flows.

Even if ESRT qualifies as a REIT for U.S. federal income tax purposes, we will be required to pay state and local taxes on our properties. From time to time changes in state and local tax laws or regulations are enacted, which may result in an increase in our tax liability. A shortfall in tax revenues for states and municipalities in which we operate may lead to an increase in the frequency and size of such changes. In particular, the federal government has recently limited the ability of individuals to deduct state and local taxes on their federal tax returns, potentially leading many high-tax states to make significant changes to their own state and local tax laws. If such changes occur, we may be required to pay additional taxes on our assets or income. These increased tax costs could adversely affect our financial condition and results of operations and the amount of cash available for the payment of dividends and distributions to our securityholders.

The real property taxes on our properties may increase as property tax rates change or as our properties are assessed or reassessed by taxing authorities. Therefore, the amount of property taxes we pay in the future may increase substantially from what we have paid in the past. If the property taxes we pay increase, our financial condition, results of operations, cash flows, per share/unit trading price of ESRT's Class A common stock and our traded OP units and our ability to satisfy our principal and interest obligations and to make distributions to our securityholders could be adversely affected.

We or ESRT may become subject to litigation, which could have a material and adverse effect on our financial condition, results of operations, cash flow and per share/unit trading price of ESRT's Class A common stock and our traded OP units.

In the future we or ESRT may become subject to litigation, including claims relating to our operations, offerings, and otherwise in the ordinary course of business. Some of these claims may result in significant defense costs and potentially significant judgments against us, some of which are not, or cannot be, insured against. We generally intend to defend ourselves vigorously; however, we cannot be certain of the ultimate outcomes of any claims that may arise in the future. Resolution of these types of matters against us or ESRT may result in our having to pay significant fines, judgments, or settlements, which, if uninsured, or if the fines, judgments, and settlements exceed insured levels, could adversely impact our earnings and cash flows, thereby having an adverse effect on our financial condition, results of operations, cash flow and per share/unit trading price of ESRT's Class A common stock and our traded OP units. Certain litigation or the resolution of certain litigation may affect the availability or cost of some of our insurance coverage, which could adversely impact our results of operations and cash flows, expose us to increased risks that would be uninsured, and/or adversely impact ESRT's ability to attract officers and directors. There is currently arbitration pending. We may incur costs for these proceedings. Please see Note 8 “Commitments and Contingencies” to the financial statements of this Annual Report in Form 10-K for a further description.

We face risks relating to cybersecurity attacks that could cause loss of confidential information and other business disruptions.

We rely extensively on computer systems to process transactions and manage our business, and our business is increasingly at risk from and may be impacted by cybersecurity attacks that continue to increase in number, intensity and sophistication. These could include internal and external attempts to gain unauthorized access to our data and computer systems to disrupt operations, corrupt data, or steal confidential information. As our reliance on technology has increased, so have the risks posed to our systems, both internal and those we have outsourced. Attacks can be both individual and/or highly organized attempts organized by very sophisticated hacking organizations. We employ a number of processes, procedures and controls to prevent, detect and mitigate these threats, which include password protection, frequent password change events, firewall detection systems, frequent backups, a redundant data system for core applications and annual penetration testing; however, there is no guarantee such measures, as well as our increased awareness of a risk of a cybersecurity attack, will be successful in preventing such an attack. A cybersecurity attack could compromise the confidential information of our employees, tenants and vendors. A successful attack could disrupt and materially affect our business operations, including damaging relationships with tenants, customers and vendors. Any compromise of our security could also result in a violation of applicable privacy and other laws, significant legal and financial exposure, damage to our reputation, loss or misuse of the information (which may be confidential, proprietary and/or commercially sensitive in nature) and a loss of confidence in our security measures, which could harm our business.

Our failure to maintain satisfactory labor relations could have a material adverse effect on our business.

As of December 31, 2018, we employed 813 employees. There are currently collective bargaining agreements which cover 573 employees, or 70% of our workforce, that service all of our office properties. We have not experienced a strike or work stoppage at any of our properties and in the opinion of management overall employee relations are good and no labor

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stoppages are anticipated. Our inability to negotiate acceptable contracts with any of these unions as existing agreements expire could result in strikes or work stoppages by the affected workers. If our unionized employees were to engage in a strike or other work stoppage, we could experience a significant disruption of our operations, which could adversely affect our business, financial condition and results of operations. In the event of a work stoppage for any extended period of time, we would likely seek to engage temporary workers to provide tenant services, which would result in increased operating costs.

Risks Related to Our Organization and Structure

Holders of ESRT Class B common stock have a significant vote in matters submitted to a vote of ESRT Securityholders.

As part of our formation, original investors were offered the opportunity to contribute their interests to us in exchange for ESRT Class A common stock, operating partnership units, a combination of one share of ESRT Class B common stock for each 50 operating partnership units to which an investor was entitled, resulting in one share of ESRT Class B common stock and 49 operating partnership units, or a combination of any of the above. Each outstanding share of ESRT Class B common stock, when accompanied by 49 operating partnership units, entitles the holder thereof to 50 votes on all matters on which ESRT Class A common securityholders are entitled to vote, including the election of directors. Holders of ESRT Class B common stock are entitled to share equally, on a per share basis, in all distributions payable with respect to shares of ESRT Class A common stock. Holders of ESRT Class B common stock may have interests that differ from those holders of ESRT Class A common stock and our securityholders, including by reason of their interest in us, and may accordingly vote as a stockholder in ways that may not be consistent with the interests of holders of ESRT Class A common stock and our securityholders. This significant voting influence over certain matters may have the effect of delaying, preventing or deterring a change of control of ESRT, or could deprive holders of ESRT Class A common stock or our securityholders of an opportunity to receive a premium for their Class A common stock or units, as applicable, as part of a sale of ESRT. ESRT Class B common stock has been issued only in connection with the formation transactions, and any such share is automatically converted to a share of ESRT Class A common stock (having a single vote) upon its holder conveying the related 49 operating partnership units to any person other than a family member, affiliate or controlled entity of such person.

The departure of any of ESRT key personnel could materially and adversely affect us.

Our success depends on the efforts of ESRT key personnel, particularly Anthony E. Malkin, ESRT's and Chief Executive Officer. Among the reasons Anthony E. Malkin is important to our success is that he has a national industry reputation that benefits us in many ways. He has led the acquisition, operating and repositioning of our assets for the last two decades. If we lost his services, our external relationships and internal leadership resources would be materially diminished.

Other members of ESRT senior management team also have strong industry reputations and experience, which aid us in attracting, identifying and exploiting opportunities. The loss of the services of one or more members of ESRT's senior management team, particularly Anthony E. Malkin, could have a material and adverse impact on us.

Tax consequences to holders of operating partnership units upon a sale or refinancing of our properties may cause the interests of certain members of ESRT senior management team to differ from your own.

As a result of the unrealized built-in gain attributable to a property at the time of contribution, some holders of operating partnership units, including Anthony E. Malkin and Peter L. Malkin, may suffer different and more adverse tax consequences than other holders of operating partnership units upon the sale or refinancing of the properties owned by us, including disproportionately greater allocations of items of taxable income and gain upon a realization event. As those holders will not receive a correspondingly greater distribution of cash proceeds, they may have different objectives regarding the appropriate pricing, timing and other material terms of any sale or refinancing of certain properties, or whether to sell or refinance such properties at all. As a result, the effect of certain transactions on Anthony E. Malkin and Peter L. Malkin may influence their decisions affecting these properties and may cause such members of ESRT senior management team to attempt to delay, defer or prevent a transaction that might otherwise be in the best interests of our other securityholders. In connection with the formation transactions, we and ESRT entered into a tax protection agreement with Anthony E. Malkin and Peter L. Malkin pursuant to which we have agreed to indemnify the Malkin Group and one additional third party investor in Metro Center (who was one of the original landowners and was involved in the development of the property) against certain tax liabilities if those tax liabilities result from (i) our sale, transfer, conveyance, or other taxable disposition of four specified properties (First Stamford Place, Metro Center, 10 Bank Street and 1542 Third Avenue) acquired by us in the consolidation for a period of 12 years from the consolidation in 2013 with respect to First Stamford Place and for the later of (x) eight years from the consolidation in 2013 or (y) the death of both Peter L. Malkin and Isabel W. Malkin who are 85 and 82 years old, respectively, for the three other properties, (ii) our failing to maintain until maturity the indebtedness secured by those

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properties or failing to use commercially reasonable efforts to refinance such indebtedness upon maturity in an amount equal to the principal balance of such indebtedness, or, if we are unable to refinance such indebtedness at its current principal amount, at the highest principal amount possible, or (iii) our failing to make available to any of these continuing investors the opportunity to guarantee, or otherwise bear the risk of loss, for U.S. federal income tax purposes, of their allocable share of $160 million of aggregate indebtedness meeting certain requirements, until such continuing investor owns less than the aggregate number of operating partnership units and shares of ESRT common stock equal to 50% of the aggregate number of such units and shares such continuing investor received in the formation transactions. As a result of entering into the tax protection agreement, Anthony E. Malkin and Peter L. Malkin may have an incentive to cause us to enter into transactions from which they may personally benefit.

ESRT's Chairman and Chief Executive Officer has outside business interests that take his time and attention away from us, which could materially and adversely affect us.

Anthony E. Malkin, ESRT's Chairman and Chief Executive Officer, has agreed to devote a majority of his business time and attention to our business and, under his employment agreement, he may also devote time to the excluded properties, the excluded businesses and certain family investments to the extent that such activities do not materially interfere with the performance of his duties to us. He owns interests in the excluded properties and excluded businessesthat were not contributed to us in the formation transactions, some of which are managed by our company and certain non-real estate family investments. In some cases, Anthony E. Malkin or his affiliates have certain management and fiduciary obligations that may conflict with such person’s responsibilities as an officer or director of ESRT and may adversely affect our operations. In addition, under his employment agreement, Anthony E. Malkin has agreed not to engage in certain business activities in competition with us (both during, and for a period of time following, his employment with us). We may choose not to enforce, or to enforce less vigorously, our rights under this agreement because of our desire to maintain our ongoing relationship with our Chairman and Chief Executive Officer given his significant knowledge of our business, relationships with our customers and significant equity ownership in us, and this could have a material adverse effect on our business.

ESRT's rights and the rights of ESRT's Securityholders to take action against ESRT's directors and officers are limited, which could limit your recourse in the event of actions not in your best interest.

ESRT's charter limits the liability of ESRT's present and former directors and officers to ESRT and its securityholders for money damages to the maximum extent permitted under Maryland law. Under current Maryland law, ESRT's present and former directors and officers will not have any liability to it or its securityholders for money damages other than liability resulting from (1) actual receipt of an improper benefit or profit in money, property or services or (2) active and deliberate dishonesty by the director or officer that was established by a final judgment and is material to the cause of action. As a result, ESRT and its securityholders may have limited rights against ESRT's present and former directors and officers, as well as persons who served as members, managers, shareholders, directors, partners, officers, controlling persons certain agents of our predecessor, which could limit your recourse in the event of actions not in your best interest.

Conflicts of interest exist or could arise in the future between the interests of ESRT Securityholders and the interests of holders of operating partnership units, which may impede business decisions that could benefit our securityholders.

Conflicts of interest exist or could arise in the future as a result of the relationships between us and our affiliates, on the one hand, and ESRT or any stockholder thereof, on the other. ESRT directors and officers have duties to ESRT under applicable Maryland law in connection with their management of ESRT. At the same time, ESRT, as the general partner of our company, has fiduciary duties and obligations to our company and our limited partners under Delaware law and our partnership agreement in connection with the management of us. ESRT’s fiduciary duties and obligations as general partner to our company and our partners may come into conflict with the duties of ESRT’s directors and officers to ESRT. Pursuant to our partnership agreement, our limited partners have agreed that in the event of a conflict in the duties owed by ESRT's directors and officers to ESRT and ESRT's securityholders and the fiduciary duties owed by ESRT, in its capacity as general partner of us, to such limited partners, ESRT will fulfill its fiduciary duties to such limited partners by acting in the best interests of ESRT's securityholders.

Additionally, the partnership agreement provides that ESRT and its directors and officers will not be liable or accountable to us for losses sustained, liabilities incurred or benefits not derived if ESRT, or such director or officer acted in good faith. The partnership agreement also provides that ESRT will not be liable to us or any partner for monetary damages for losses sustained, liabilities incurred or benefits not derived by us or any limited partner, except for liability for ESRT’s intentional harm or gross negligence. Moreover, the partnership agreement provides that we are required to indemnify our directors and officers, ESRT and its directors and officers and authorizes us to indemnify present and former members,

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managers, shareholders, directors, limited partners, general partners, officers or controlling persons of our predecessor and authorizes us to indemnify members, partners, employees and agents of us or our predecessor, in each case for actions taken by them in those capacities from and against any and all claims that relate to the operations of our company, except (1) if the act or omission of the person was material to the matter giving rise to the action and either was committed in bad faith or was the result of active and deliberate dishonesty, (2) for any transaction for which the indemnified party received an improper personal benefit, in money, property or services or otherwise, in violation or breach of any provision of the partnership agreement or (3) in the case of a criminal proceeding, if the indemnified person had reasonable cause to believe that the act or omission was unlawful. No reported decision of a Delaware appellate court has interpreted provisions similar to the provisions of our partnership agreement that modify and reduce ESRT’s fiduciary duties or obligations as the general partner or reduce or eliminate ESRT’s liability for money damages to us and our partners, and ESRT has not obtained an opinion of counsel as to the enforceability of the provisions set forth in the partnership agreement that purport to modify or reduce the fiduciary duties that would be in effect were it not for the partnership agreement.

ESRT could increase or decrease the number of authorized shares of ESRT stock, classify and reclassify unissued ESRT stock and issue ESRT stock without ESRT stockholder approval, which could prevent a change in control of ESRT and negatively affect the market value of ESRT's shares.

ESRT’s board of directors, without stockholder approval, has the power under ESRT’s charter to amend its charter from time to time to increase or decrease the aggregate number of ESRT shares of stock or the number of ESRT shares of stock of any class or series that ESRT is authorized to issue, to authorize ESRT to issue authorized but unissued shares of ESRT common stock or preferred stock and to classify or reclassify any unissued shares of ESRT common stock or preferred stock into one or more classes or series of stock and set the terms of such newly classified or reclassified shares. As a result, ESRT may issue series or classes of ESRT common stock or preferred stock with preferences, distributions, powers and rights, voting or otherwise, that are senior to, or otherwise conflict with, the rights of holders of ESRT common stock. Any such issuance could dilute existing ESRT securityholders’ interests. Although ESRT’s board of directors has no such intention at the present time, it could establish a class or series of ESRT preferred stock that could, depending on the terms of such series, delay, defer or prevent a transaction or a change of control that might involve a premium price for ESRT's common stock or that our ESRT securityholders otherwise believe to be in their best interest.

We may issue additional operating partnership units without the consent of our securityholders, which could have a dilutive effect on our securityholders and ESRT’s Securityholders.

We may issue additional operating partnership units to third parties without the consent of our securityholders, which would reduce ESRT’s ownership percentage in us and would have a dilutive effect on the interests of our existing securityholders and on the amount of distributions made to ESRT, our securityholders and to us and, therefore, the amount of distributions ESRT can make to its securityholders. Any such issuances, or the perception of such issuances, could materially and adversely affect the market price of ESRT's Class A common stock or our traded OP units.

Certain provisions in our partnership agreement may delay or prevent unsolicited acquisitions of us.

Provisions in our partnership agreement may delay or make more difficult unsolicited acquisitions of us or changes of our control. These provisions could discourage third parties from making proposals involving an unsolicited acquisition of us or change of our control, although some of our securityholders might consider such proposals, if made, desirable. These provisions include, among others:

• redemption rights of qualifying parties;

• transfer restrictions on operating partnership units;

• ESRT's ability, as general partner, in some cases, to amend the partnership agreement and to cause us to issue units with terms that could delay, defer or prevent a merger or other change of control of us or ESRT without the consent of the limited partners;

• the right of the limited partners to consent to transfers of the general partnership interest and mergers or other transactions involving us under specified circumstances; and

• a redemption premium payable to the holders of our operating partnership’s preferred units if our operating partnership decides, at its option, to redeem preferred units for cash upon the occurrence of certain fundamental transactions, such as a change of control.

ESRT's charter, bylaws, our partnership agreement and Maryland law also contain other provisions that may delay, defer or prevent a transaction or a change of control that might involve a premium price for our units or that of our securityholders or ESRT's common stock or that its securityholders otherwise believe to be in their best interest.

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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 our 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 its 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 approximately 17.2% 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 its 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 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’s shares will be null and void.

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

As of December 31, 2018, Anthony E. Malkin, ESRT’s Chairman and Chief Executive Officer, together with the Malkin Group, has the right to vote 40,859,706 shares of ESRT’s common stock, which represents approximately 18.1% 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, including business combinations, consolidations and mergers and the determination of ESRT’s day-to-day corporate and management policies.

As of December 31, 2018, QIA had a 9.9% fully diluted interest in us, which represented 17.2% 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.

Our sole general partner, ESRT, acting through its board of directors may change our strategies, policies or procedures without stockholder consent, which may subject us to different and more significant risks in the future.

Our investment, financing, leverage and distribution policies and our policies with respect to all other activities, including growth, debt, capitalization and operations, will be determined by our sole general partner, ESRT, acting through its board of directors. These policies may be amended or revised at any time and from time to time at the discretion of ESRT without notice to or a vote of our securityholders. This could result in us conducting operational matters, making investments

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or pursuing different business or growth strategies. Under these circumstances, ESRT may expose us to different and more significant risks in the future, which could have a material adverse effect on our business and growth. In addition, ESRT may change our policies with respect to conflicts of interest provided that such changes are consistent with applicable legal requirements. A change in these policies could have an adverse effect on our financial condition, results of operations, cash flow, per unit trading price of our traded OP units and ability to satisfy our principal and interest obligations and to make distributions to our securityholders.

Risks Related to ESRT Common Stock and our Traded OP Units

Our cash available for distribution may not be sufficient to make distributions at expected levels.

We intend to make distributions to our securityholders. All dividends and distributions will be made at the discretion of our sole general partner, ESRT, acting through its board of directors, and will depend on our earnings, financial condition, maintenance of ESRT’s REIT qualification and other factors as ESRT’s board of directors may deem relevant from time to time. If sufficient cash is not available for distribution from our operations, we may have to fund distributions from working capital or to borrow to provide funds for such distribution, or to reduce the amount of such distribution. We cannot assure you that our distributions will be made or sustained. Any distributions we pay in the future will depend upon our actual results of operations, economic conditions and other factors that could differ materially from our current expectations.

The market price of shares of ESRT's Class A common stock and our traded OP units could be adversely affected by our level of cash distributions.

The market value of the equity securities of a REIT is based primarily upon the market’s perception of the REIT’s growth potential and its current and potential future cash distributions, whether from operations, sales or refinancings, and is secondarily based upon the real estate market value of the underlying assets. For that reason, ESRT's Class A common stock and traded OP units may trade at prices that are higher or lower than our net asset value per share. To the extent we retain operating cash flow for investment purposes, working capital reserves or other purposes, these retained funds, while increasing the value of our underlying assets, may not correspondingly increase the market price of ESRT's Class A common stock and traded OP units. Our failure to meet the market’s expectations with regard to future earnings and cash distributions likely would adversely affect the market price of ESRT's Class A common stock and our traded OP units.

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 required 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. ESRT filed the resale shelf registration statement with the SEC on February 2, 2017 and renewed it on August 3, 2017. Subsequently, QIA is 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, as of December 31, 2018, QIA owns approximately 17.2% 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.

Future issuances of debt securities or preferred units and future issuances of equity securities (including operating partnership units), may materially and adversely affect the market price of shares of ESRT's Class A common stock and traded OP units.

In the future, we or ESRT may issue debt or equity securities or make other borrowings. Upon liquidation, holders of our or ESRT’s debt securities, preferred units and other loans and preferred shares will receive a distribution of our available assets before holders of shares of ESRT’s common stock. We or ESRT are not required to offer any such additional debt or equity securities to existing ESRT securityholders or our securityholders, as applicable, on a preemptive basis. Therefore, additional shares of ESRT’s common stock issuances, directly or through convertible or exchangeable securities (including

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operating partnership units), warrants or options, will dilute the holdings of ESRT’s existing common securityholders and such issuances or the perception of such issuances may reduce the market price of shares of ESRT’s Class A common stock or our traded OP units. ESRT’s preferred units or shares, if issued, would likely have a preference on distribution payments, periodically or upon liquidation, which could limit ESRT’s ability to make distributions to holders of shares of ESRT’s common stock. Because our or ESRT’s decision to issue debt or equity securities or otherwise incur debt in the future will depend on market conditions and other factors beyond our control, we cannot predict or estimate the amount, timing or nature of our or ESRT's future capital raising efforts. Thus, holders of shares of ESRT’s common stock or our securityholders bear the risk that our or ESRT’s future issuances of debt or equity securities or ESRT's other borrowings will reduce the market price of shares of ESRT’s Class A common stock and our traded OP units and dilute their ownership in us or ESRT, as applicable.

Our balance sheet includes significant amounts of goodwill. The impairment of a significant portion of this goodwill could negatively affect our business, financial condition and results of operations.

Our balance sheet includes goodwill of approximately $491.5 million at December 31, 2018. These assets consist primarily of goodwill associated with our acquisition of the controlling interest in Empire State Building Company L.L.C. and 501 Seventh Avenue Associates L.L.C. We also expect to engage in additional acquisitions, which may result in our recognition of additional goodwill. Under accounting standards goodwill is not amortized. On an annual basis and whenever events or changes in circumstances indicate the carrying value or goodwill may be impaired, we are required to assess whether there have been impairments in the carrying value of goodwill. If the carrying value of the asset is determined to be impaired, then it is written down to fair value by a charge to operating earnings. An impairment of goodwill could have a material adverse effect on our business, financial condition and results of operations.

There remains uncertainty as to how the recently-revised partnership tax audits will be applied.

The Bipartisan Budget Act of 2015, effective for taxable years beginning after December 31, 2017, requires us and any subsidiary partnership to pay the hypothetical increase in partner-level taxes (including interest and penalties) resulting from an adjustment of partnership tax items on audit or in other tax proceedings, unless the partnership elects an alternative method under which the taxes resulting from the adjustment (and interest and penalties) are assessed at the partner level. In addition, Treasury Regulations provide that a partner that is a REIT may be able to use deficiency dividend procedures with respect to such adjustments. Many uncertainties remain as to the application of these rules, and the impact they will have on us. However, it is possible, that we and partnerships in which we invest may be subject to U.S. federal income tax, interest and penalties in the event of a U.S. federal income tax audit as a result of these law changes.

Tax Risks Related to Ownership of Our Units

If we are treated as a corporation for U.S. federal income tax purposes, we will be subject to entity-level U.S. federal income tax and ESRT will cease to qualify as a REIT.

We believe that we qualify as a partnership for U.S. federal income tax purposes. Assuming that we qualify as a partnership for U.S. federal income tax purposes, we are generally not subject to U.S. federal income tax on our income. Instead, each of our securityholders, including ESRT, is required to include in income its allocable share of our income. We are treated as publicly traded partnership under the Code, and accordingly we will be treated as a corporation for U.S. federal income tax purposes unless we meet certain requirements. In particular, in order to qualify as a partnership for U.S federal income tax purposes, at least 90% of our gross income must be derived from certain specified sources of qualifying income, which generally includes income treated as qualifying rental income for purposes of the REIT gross income tests and other income from passive sources. We believe that we satisfy this test. No assurance can be provided, however, that the IRS will not challenge our status as a partnership for U.S. federal income tax purposes, or that a court would not sustain such a challenge. If the IRS were successful in treating us as a corporation for U.S. federal income tax purposes, we would be subject to U.S. federal, state and local corporate income tax, which would significantly reduce the amount of cash available to satisfy obligations to make principal and interest payments on our debt and to make distribution to our securityholders, and the tax consequences of holding our operating partnership units could be adversely affected. In addition, ESRT would cease to qualify as a REIT.

You may be allocated more taxable income than the distributions you receive from us.

So long as we remain eligible to be taxed as a partnership for U.S. federal income tax purposes, we generally are not subject to U.S. federal income tax. Rather, each holder of our operating partnership units is required to take into account its allocable share of items of our income, gain, loss, deduction and credit for our taxable year ending within or with the taxable

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year of such holder in computing such holder's U.S. federal income tax liability, regardless of whether the holder has received any distributions from us. It is possible that the U.S. federal income tax liability of a holder of our operating partnership units with respect to its allocable share of our earnings in a particular taxable year could exceed the cash distributions we make to the holder for the year, thus requiring an out-of-pocket tax payment by the holder.

Your ability to deduct certain losses allocated from us may be subject to limitations.

Your ability to utilize any tax losses or deductions generated by us may be limited under the “at risk” limitation in Section 465 of the Code, the passive activity loss limitation in Section 469 of the Code, the basis limitation of Section 704(d) of the Code, the suspension of miscellaneous itemized deductions in Section 67 of the Code, the limitation on excess business losses in Section 461 of the Code, and/or other provisions of the Code. These limitations may, among other things, prevent a holder from utilizing allocations of loss and deduction from us against income from other sources. The passive activity loss rules are applied separately with respect to items of income and loss of each publicly traded partnership held by a holder. Furthermore, your ability to utilize certain specific items of deduction may be limited under certain provisions of the Code. The application of these limitations depends on the exact nature of our current and future operations and the individual tax positions of such holders. Holders of operating partnership units should consult with their tax advisor regarding the potential application of these provisions.

Participants may recognize taxable gain resulting from a reduction in their allocable share of our liabilities.

We may elect to pay down our indebtedness or refinance such indebtedness with unsecured debt, which may reduce the amount of our liabilities allocable to a holder of operating partnership units. In addition, certain commitments pursuant to our tax protection agreements could result in less liabilities available to be allocated to holders of operating partnership units as a result of our obligation to offer to certain parties opportunities to guarantee certain indebtedness. Over time, property depreciation, capital improvements made to the properties and debt amortization and repayment, among other things, may reduce the share of our liabilities allocated to a holder of operating partnership units. A reduction in the share of our liabilities allocated to a holder of operating partnership units (such as from a pay down of mortgage debt over time) that exceeds the holder's U.S. federal income tax basis in its operating partnership units is treated as taxable gain from the sale or exchange of such units. Holders of our operating partnership units should consult their tax advisors with regard to their share of our liabilities.

Failure of ESRT to qualify as a REIT would have a material adverse effect on us.

We, in general, and the holders of our operating partnership units, in particular, must rely on ESRT, as our general partner, to manage our affairs and business. ESRT is subject to certain risks that may affect its financial and other conditions, including particularly adverse consequences if it fails to qualify as a REIT for U.S. federal income tax purposes. ESRT's qualification as a REIT involves the application of highly technical and complex Code provisions and Treasury Regulations promulgated thereunder for which there are limited judicial and administrative interpretations. Furthermore, ESRT's qualification as a REIT depends in part on the nature of our assets and income and the results of our operations. Moreover, new legislation, court decisions or administrative guidance, in each case possibly with retroactive effect, may make it more difficult or impossible for ESRT to qualify as a REIT. Thus, while we and ESRT intend to operate so that ESRT will qualify as a REIT, given the highly complex nature of the rules governing REITs, the ongoing importance of factual determinations, and the possibility of future changes in circumstances, no assurance can be given that ESRT will so qualify for any particular year. These considerations also might restrict the types of assets that we can acquire in the future.

If ESRT fails to qualify as a REIT it will face serious tax consequences which will directly and adversely impact us and may substantially reduce the funds available for payment of distributions to our securityholders, and it will be not be able to qualify as a REIT for four years following such failure. If ESRT fails to qualify as a REIT but is eligible for certain relief provisions, then it may retain its status as a REIT but may be required to pay a penalty tax, which could be substantial.

In order to enable ESRT to comply with the REIT requirements, we may be required to forego and/or liquidate otherwise attractive investments.

To qualify as a REIT, (and avoid certain taxes to which it would be subject notwithstanding its status as a REIT), ESRT must meet, on an ongoing basis, certain tests regarding the nature and diversification of its assets and its income. Because substantially all of ESRT's assets consists of our partnership units and substantially all of ESRT's income consists of income allocations with respect to such units, ESRT's ability to satisfy these tests will depend on the composition of our assets

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and income. Similarly, in order to be treated as a partnership for U.S. federal income tax purposes, we must meet certain annual tests relating to the sources of our gross income. In order to meet these tests and to allow ESRT to meet these tests, we may be required to take or forego taking actions that we would otherwise consider advantageous. For instance, we may be required to forego investments that we otherwise would make. Furthermore, we may be required to liquidate from our portfolio otherwise attractive investments. In addition, we may be required to make distributions to ESRT at disadvantageous times or when we do not have funds readily available for distribution. These actions could have the effect of reducing our income and amounts available for distribution to our securityholders. Thus, operating in a manner that allows ESRT to comply with the REIT requirements and causes us to continue to be treated as a partnership for U.S. federal income tax purposes may hinder our investment performance.

In order to allow ESRT to comply with the REIT distribution requirements, we may be required to borrow funds during unfavorable market conditions or may be subject to tax, which would reduce the cash available for distribution to our securityholders.

In order for ESRT to qualify as a REIT, it must distribute to its securityholders, 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, ESRT will be subject to U.S. federal income tax at the generally applicable corporate tax rate 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 by which its distributions in any calendar year are less than a minimum amount specified under U.S. federal income tax laws. Our partnership agreement provides that we will make sufficient distributions to ESRT to enable it to satisfy these distribution requirements and to avoid U.S. federal corporate income tax and the 4% excise tax.

Our taxable income may exceed our net income as determined by GAAP because, for example, realized capital losses will be deducted in determining our GAAP net income, but may not be deductible in computing our taxable income. In addition, we may incur nondeductible capital expenditures or be required to make debt or amortization payments or the effect of limitations on interest (subject to an exception for an electing real property trade or business) and net operating loss deductibility under the TCJA (as defined below) could cause our taxable income to exceed our net income as determined by GAAP. As a result of the foregoing, we may generate less cash flow than taxable income in a particular year. As a result, we may be required to use cash reserves, incur debt or liquidate assets at rates or times that we regard as unfavorable in order to allow ESRT to satisfy the REIT 90% distribution requirement and to avoid U.S. federal income tax and the 4% nondeductible excise tax in that year.

Specific transactions or tax elections may cause you to recognize gain or otherwise affect your investment.

As a general matter, per the terms of our partnership agreement, ESRT is not required to take into account tax consequences to the other holders of operating partnership units in deciding whether to cause us to undertake specific transactions or make tax elections that could cause you to recognize gain. Consequently, we could enter into transactions that result in additional taxable income allocations to you at any time, and your share of our liabilities could be reduced at any time.

We cannot match the transferor of particular Series 60, Series 250, or Series ES operating partnership units with the respective transferee of such operating partnership units, and we have therefore adopted certain income tax accounting positions that may not conform with all aspects of applicable tax requirements. The IRS may challenge this treatment, which could adversely affect the tax consequences, liquidity and market price of such operating partnership units.

Because we cannot match the transferor of particular Series 60, Series 250, or Series ES operating partnership units with the respective transferee of such operating partnership units, we have adopted certain depreciation, amortization and other tax accounting positions that may not conform with all aspects of existing Treasury Regulations. A successful challenge to those positions could adversely affect the amount of tax benefit available or taxable income allocated to holders of such operating partnership units. It also could affect the timing of certain tax benefits or the amount of gain on the sale of such operating partnership units and could have a negative impact on the value of such operating partnership units or result in audits of and adjustments to the tax returns of holders of Series 60, Series 250, or Series ES operating partnership units.

In addition, our taxable income and losses are determined and apportioned among investors using conventions we regard as consistent with applicable law. As a result, if you transfer your operating partnership units, you may be allocated income, gain, loss and deduction realized by us after the date of transfer. Similarly, a transferee may be allocated income, gain, loss and deduction realized by us prior to the date of the transferee’s acquisition of operating partnership units and, in certain circumstances, even if such a transferee receives no distributions. A transferee may also bear the cost of withholding tax imposed with respect to income allocated to a transferor through a reduction in the cash distributed to the transferee.

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If we are not able to lease the Empire State Building observatory to a TRS in a manner consistent with the ruling that ESRT has received from the IRS, or if we are not able to maintain our broadcast licenses in a manner consistent with the ruling ESRT has received from the IRS, we would be required to restructure our operations in a manner that could adversely affect the value of our operating partnership units.

Rents from real property are generally not qualifying income for purposes of the REIT gross income tests and the gross income test that we must satisfy in order to be treated as a partnership for U.S. federal income tax purposes if the rent is treated as “related party rent.” Related party rent generally includes (i) any rent paid by a corporation if the REIT (or any person who owns 10% or more of the stock of the REIT by value) directly or indirectly owns 10% or more of the stock of the corporation by vote or value and (ii) rent paid by a partnership if the REIT (or any person who owns 10% or more of the stock of the REIT by value) directly or indirectly owns an interest of 10% or more in the assets or net profits of the partnership. Under an exception to this rule, related party rent is treated as qualifying income for purposes of the REIT gross income tests if it is paid by a taxable REIT subsidiary, or a TRS, of the REIT and (i) at least 90% of the leased space in the relevant property is rented to persons other than either TRSs or other related parties of the REIT, and (ii) the amounts paid to the REIT as rent from real property are substantially comparable to the rents paid by unrelated tenants of the REIT for comparable space.

Income from admissions to the Empire State Building observatory, and certain other income generated by the observatory, would not likely be qualifying income for purposes of the REIT gross income tests. ESRT has jointly elected with ESRT Observatory TRS, L.L.C., or Observatory TRS, our wholly owned subsidiary and the current lessee and operator of the observatory, for Observatory TRS to be treated as a TRS of ESRT for U.S. federal income tax purposes. Observatory TRS leases the Empire State Building observatory from us pursuant to a lease that provides for fixed base rental payments and variable rental payments equal to certain percentages of Observatory TRS’s gross receipts from the operation of the observatory. Given the unique nature of the real estate comprising the observatory, ESRT does not believe that there is any space in the Empire State Building or in the same geographic area as the Empire State Building that would likely be considered sufficiently comparable to the observatory for the purpose of applying the exception to related party rent described above. ESRT has received from the IRS a private letter ruling that its allocable share of the rent that we receive from Observatory TRS pursuant to the lease described above is qualifying income for purposes of the REIT gross income tests so long as such rent reflects the fair market rental value of the Empire State Building observatory as determined by an appraisal rendered by a qualified third party appraiser.

In addition, we are party to various license agreements (i) granting certain third party broadcasters the right to use space on the tower on the top of the Empire State Building for certain broadcasting and other communication purposes and (ii) granting certain third party vendors the right to operate concession stands in the observatory. ESRT has received from the IRS a private letter ruling that its allocable share of the license fees that we receive under the license agreements described above are qualifying income for purposes of the REIT gross income tests.

ESRT is entitled to rely upon these private letter rulings only to the extent that it did not misstate or omit a material fact in the ruling request and that we and ESRT continue to operate in accordance with the material facts described in such request, and no assurance can be given that we or ESRT will always be able to do so. If ESRT were not able to treat its allocable share of the rent that the we receive from Observatory TRS as qualifying income for purposes of the REIT gross income tests, in order to qualify as a partnership for U.S. federal income tax purposes and in order to allow ESRT to continue to qualify as a REIT, we would be required to restructure the manner in which we operate the observatory, which would likely require us to cede operating control of the observatory by leasing the observatory to an affiliate or third party operator. If ESRT were not able to treat its allocable share of the license fees that we receive from the license agreements described above as qualifying income for purposes of the REIT gross income tests, in order to continue to be treated as a partnership for U.S. federal income tax purposes and in order to allow ESRT to continue to qualify as a REIT, we would be required to enter into the license agreements described above through a corporate subsidiary that elects to be treated as a TRS of ESRT, which would cause the license fees to be subject to U.S. federal income tax and accordingly reduce the amount of our cash flow available to be distributed to our securityholders. In either case, if we are not able to appropriately restructure our operations in a timely manner, ESRT would likely realize significant income that does not qualify for the REIT gross income tests, which could cause ESRT to fail to qualify as a REIT, and we could fail to be treated as a partnership for U.S. federal income tax purposes.

We may have inherited tax liabilities from the entities that have been merged into us or our subsidiaries in the formation transactions.

Pursuant to the formation transactions, Malkin Properties of Connecticut, Inc., a Connecticut corporation, or Malkin Properties CT, and Malkin Construction Corp., a Connecticut corporation, or Malkin Construction merged with and into a subsidiary of ESRT, with the subsidiary surviving, in a transaction that was intended to be treated as a reorganization under the

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Code, and which subsidiary was subsequently contributed to us. Each of Malkin Properties CT and Malkin Construction had previously elected to be treated as an S Corporation for U.S. federal income tax purposes under Section 1361 of the Code with respect to periods preceding our formation transactions. If either of Malkin Properties CT or Malkin Construction had failed to qualify as an S corporation with respect to periods preceding our formation transaction, we could have assumed materialU.S. federal income tax liabilities in connection with the formation transactions and/or may be subject to certain other adverse tax consequences. No rulings from the IRS were requested and no opinions of counsel were rendered regarding the U.S. federal income tax treatment of any of Malkin Properties CT or Malkin Construction with respect to periods preceding our formation transactions. Accordingly, no assurance can be given that Malkin Properties CT or Malkin Construction qualified as an S corporation for U.S. federal income tax purposes during such periods, or that these entities did not have any other tax liabilities. In addition, the supervisor merged with a subsidiary of us in the formation transactions, and as a result, we may have inherited any liabilities, including any tax liabilities, of the supervisor.

Prospective investors are urged to consult with their tax advisors regarding the effects of recently enacted tax legislation and other legislative, regulatory and administrative developments.

On December 22, 2017, President Trump signed into law H.R. 1, informally titled the Tax Cuts and Jobs Act (the “TCJA”). The TCJA makes major changes to the Code, including a number of provisions of the Code that affect the taxation of REITs and their shareholders. Among the changes made by the TCJA are permanently reducing the generally applicable corporate tax rate, generally reducing the tax rate applicable to individuals and other noncorporate taxpayers for tax years beginning after December 31, 2017 and before January 1, 2026, eliminating or modifying certain previously allowed deductions (including substantially limiting interest deductibility and, for individuals, the deduction for non-business state and local taxes), and, for taxable years beginning after December 31, 2017 and before January 1, 2026, providing for preferential rates of taxation through a deduction of up to 20% (subject to certain limitations) on most ordinary REIT dividends, allocations of income from certain publicly-traded partnerships (including us) and certain trade or business income of non-corporate taxpayers for purposes of determining their U.S. federal income tax (but not for purposes of the 3.8% Medicare tax and self-employment tax). The TCJA also imposes new limitations on the deduction of net operating losses, which may result in our having to make additional taxable distributions to our shareholders in order to comply with REIT distribution requirements or to avoid taxes on retained income and gains. The effect of the significant changes made by the TCJA remains uncertain, and administrative guidance, which has and will continue to be issued on an ongoing basis, is required in order to fully evaluate the effect of many provisions. The effect of any technical corrections with respect to the TCJA could have an adverse effect on us or our shareholders. Investors should consult their tax advisors regarding the implications of the TCJA on their investment in our interests.

Legislative or regulatory tax changes related to REITs and other business entities could materially and adversely affect our business.

               At any time, the U.S. federal income tax laws or regulations governing REITs or the administrative interpretations of those laws or regulations may be changed, possibly with retroactive effect.  We cannot predict if or when any new U.S. federal income tax law, regulation or administrative interpretation, or any amendment to any existing U.S. federal income tax law, regulation or administrative interpretation, will be adopted, promulgated or become effective or whether any such law, regulation or interpretation may take effect retroactively.  We and our securityholders could be adversely affected by any such change in, or any new, U.S. federal income tax law, regulation or administrative interpretation.

Your investment has various tax risks.

Although this section describes certain tax risks relevant to an investment in our securities, you should consult your tax advisor concerning the effects of U.S. federal, state, local and foreign tax laws to you with regard to an investment in our securities.

If a transaction intended to qualify as a Section 1031 Exchange is later determined to be taxable, we may face adverse consequences, and if the laws applicable to such transactions are amended or repealed, we may not be able to dispose of properties on a tax deferred basis.

From time to time we may dispose of properties in transactions that are intended to qualify as Section 1031 Exchanges. It is possible that the qualification of a transaction as a Section 1031 Exchange could be successfully challenged and determined to be currently taxable. In such case, our taxable income and earnings and profits would increase. This could

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increase the dividend income to our stockholders by reducing any return of capital they received. In some circumstances, we may be required to pay additional dividends or, in lieu of that, corporate income tax, possibly including interest and penalties. As a result, we may be required to borrow funds in order to pay additional dividends or taxes, and the payment of such taxes could cause us to have less cash available to distribute to our stockholders. In addition, if a Section 1031 Exchange were later to be determined to be taxable, we may be required to amend our tax returns for the applicable year in question, including any information reports we sent our stockholders. Moreover, it is possible that legislation could be enacted that could modify or repeal the laws with respect to Section 1031 Exchanges, which could make it more difficult or impossible for us to dispose of properties on a tax deferred basis.

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ITEM 1B. UNRESOLVED STAFF COMMENTS

As of December 31, 2018, we did not have any unresolved comments with the staff of the SEC.

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ITEM 2. PROPERTIES

Our Portfolio Summary

As of December 31, 2018, our portfolio consisted of 14 office properties and six standalone retail properties totaling approximately 10.1 million rentable square feet and was approximately 88.8% occupied, yielding approximately $535.5 million of annualized rent. Giving effect to leases signed but not yet commenced, our portfolio was approximately 91.8% leased as of December 31, 2018. In addition, we owned entitled land that will support the development of an approximately 380,000 rentable square foot office building and garage ("Metro Tower") at the Stamford Transportation Center in Stamford, Connecticut, adjacent to one of our office properties. The table below presents an overview of our portfolio as of December 31, 2018.

							Annualized
		Rentable					Rent per
		Square	Percent		Annualized		Occupied		Number of
Property Name	Location or Sub-Market	Feet (1)	Occupied (2)		Rent (3)		Square Foot (4)		Leases (5)
Manhattan Office Properties - Office
The Empire State Building (6)	Penn Station -Times Sq. South	2,711,148	94.3	%	$	150,529,864	$	58.88	174
One Grand Central Place	Grand Central	1,247,366	87.5	%	62,462,156		57.20		210
1400 Broadway (7)	Penn Station -Times Sq. South	914,162	80.5	%	36,996,042		50.29		29
111 West 33rd Street (8)	Penn Station -Times Sq. South	639,237	78.0	%	28,556,500		57.30		19
250 West 57th Street	Columbus Circle - West Side	468,525	80.3	%	22,355,109		59.41		54
501 Seventh Avenue	Penn Station -Times Sq. South	460,150	95.7	%	19,825,295		45.00		29
1359 Broadway	Penn Station -Times Sq. South	455,824	97.4	%	23,706,788		53.40		35
1350 Broadway (9)	Penn Station -Times Sq. South	373,205	84.1	%	18,005,509		57.36		60
1333 Broadway	Penn Station -Times Sq. South	292,835	89.4	%	13,732,665		52.48		10
Manhattan Office Properties - Office		7,562,452	88.8	%	376,169,928		55.99		620
Manhattan Office Properties - Retail
The Empire State Building (10)	Penn Station -Times Sq. South	104,558	69.8	%	13,364,098		183.13		14
One Grand Central Place	Grand Central	68,732	79.0	%	6,402,538		117.91		13
1400 Broadway (7)	Penn Station -Times Sq. South	20,418	77.4	%	2,020,613		127.78		8
112 West 34th Street (8)	Penn Station -Times Sq. South	90,132	100.0	%	22,596,784		250.71		4
250 West 57th Street	Columbus Circle - West Side	67,927	100.0	%	9,974,747		146.85		8
501 Seventh Avenue	Penn Station -Times Sq. South	35,558	88.3	%	2,016,286		64.20		9
1359 Broadway	Penn Station -Times Sq. South	27,506	100.0	%	2,263,576		82.29		6
1350 Broadway	Penn Station -Times Sq. South	31,774	100.0	%	6,799,221		213.99		6
1333 Broadway	Penn Station -Times Sq. South	67,001	100.0	%	9,006,000		134.42		4
Manhattan Office Properties - Retail		513,606	89.3	%	74,443,863		162.24		72
Sub-Total/Weighted Average Manhattan Office Properties - Office and Retail		8,076,058	88.9	%	450,613,791		62.78		692

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Greater New York Metropolitan Area Office Properties
First Stamford Place (11)	Stamford, CT	783,729	88.6	%	30,139,103		43.41		48
Metro Center	Stamford, CT	281,928	82.5	%	13,576,111		58.36		25
383 Main Street	Norwalk, CT	260,657	82.9	%	7,181,693		33.25		21
500 Mamaroneck Avenue	Harrison, NY	288,202	86.5	%	7,217,593		28.96		31
10 Bank Street	White Plains, NY	232,517	96.9	%	7,974,296		35.38		34
Sub-Total/Weighted Average Greater New York Metropolitan Office Properties		1,847,033	87.6	%	66,088,796		40.86		159
Standalone Retail Properties
10 Union Square	Union Square	58,007	100.0	%	7,019,176		121.01		13
1542 Third Avenue	Upper East Side	56,250	100.0	%	3,895,512		69.25		4
1010 Third Avenue	Upper East Side	44,662	100.0	%	3,745,234		83.86		2
77 West 55th Street	Midtown	25,388	100.0	%	2,694,194		106.12		3
69-97 Main Street	Westport, CT	17,111	32.4	%	708,876		127.93		2
103-107 Main Street	Westport, CT	4,330	100.0	%	722,355		166.83		1
Sub-Total/Weighted Average Standalone Retail Properties		205,748	94.4	%	18,785,347		96.74		25
Portfolio Total		10,128,839	88.8	%	$	535,487,934	$	59.57	876
Total/Weighted Average Office Properties		9,409,485	88.6	%	$	442,258,724	$	53.05	779
Total/Weighted Average Retail Properties (12)		719,354	90.8	%	93,229,210		142.77		97
Portfolio Total		10,128,839	88.8	%	$	535,487,934	$	59.57	876

(1) Excludes (i) 179,350 square feet of space across our portfolio attributable to building management use and tenant amenities and (ii) 69,789 square feet of space attributable to our observatory.

(2) Based on leases signed and commenced as of December 31, 2018 and calculated as (i) rentable square feet less available square feet divided by (ii) rentable square feet.

(3) Represents annualized base rent and current reimbursement for operating expenses and real estate taxes.

(4) Represents annualized rent under leases commenced as of December 31, 2018 divided by occupied square feet.

(5) Represents the number of leases at each property or on a portfolio basis. If a tenant has more than one lease, whether or not at the same property, but with different expirations, the number of leases is calculated equal to the number of leases with different expirations.

(6) Includes 42,546 rentable square feet of space leased by our broadcasting tenants.

(7) Denotes a ground leasehold interest in the property with a remaining term, including unilateral extension rights available to the Company, of approximately 45 years (expiring December 31, 2063).

(8) Denotes a ground leasehold interest in the property with a remaining term, including unilateral extension rights available to the Company, of approximately 59 years (expiring May 31, 2077).

(9) Denotes a ground leasehold interest in the property with a remaining term, including unilateral extension rights available to us, of approximately 32 years (expiring July 31, 2050).

(10) Includes 5,300 rentable square feet of space leased by WDFG North America, a licensee of our observatory.

(11) First Stamford Place consists of three buildings.

(12) Includes 513,606 rentable square feet of retail space in our Manhattan office properties.

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Tenant Diversification

As of December 31, 2018, our office and retail portfolios were leased to a diverse tenant base consisting of approximately 876 leases. Our tenants represent a broad array of industries as follows:

Diversification by Industry	Percent (1)
Arts and entertainment	2.1	%
Broadcast	1.3	%
Consumer goods	21.8	%
Finance, insurance, real estate	16.1	%
Government entity	1.8	%
Healthcare	1.7	%
Legal services	3.7	%
Media and advertising	3.9	%
Non-profit	4.4	%
Professional services (not including legal services)	10.8	%
Retail	17.1	%
Technology	9.5	%
Others	5.8	%
Total	100.0	%
(1) Based on annualized rent.

The following table sets forth information regarding the 20 largest tenants in our portfolio based on annualized rent as of December 31, 2018.

			Weighted		Percent of
			Average	Total	Portfolio				Percent of
			Remaining	Occupied	Rentable				Portfolio
		Lease	Lease	Square	Square		Annualized		Annualized
Tenant	Property	Expiration (1)	Term (2)	Feet (3)	Feet (4)		Rent (5)		Rent (6)
Global Brands Group	ESB, 1333 Broadway	Oct 2023-Oct. 2028	9.3 years	668,942	6.4	%	$	36,047,748	6.7	%
LinkedIn	Empire State Building	Feb. 2026	7.2 years	312,947	3.0	%	18,349,123		3.4	%
Coty Inc.	Empire State Building	Jan. 2030	11.1 years	312,954	3.0	%	16,954,249		3.2	%
PVH Corp.	501 Seventh Avenue	Dec. 2018-Oct. 2028	9.3 years	237,281	2.3	%	11,275,477		2.1	%
Sephora	112 West 34th Street	Jan. 2029	10.1 years	11,334	0.1	%	10,457,709		2.0	%
Li & Fung	1359 Broadway	Oct. 2021-Oct. 2027	5.3 years	149,436	1.4	%	7,471,631		1.4	%
Urban Outfitters	1333 Broadway	Sept. 2029	10.8 years	56,730	0.5	%	7,103,124		1.3	%
Federal Deposit Insurance Corp.	Empire State Building	Jan. 2020	1.1 years	121,879	1.2	%	7,042,014		1.3	%
Macy's	111 West 33rd Street	May 2030	11.4 years	131,117	1.3	%	6,947,109		1.3	%
HNTB Corporation	Empire State Building	Feb. 2029	10.2 years	105,143	1.0	%	6,661,814		1.2	%
Duane Reade/Walgreen's	ESB, 1350 B'Way, 250 West 57th	Feb. 2021-Sept. 2027	5.9 years	47,541	0.5	%	6,343,147		1.2	%
Foot Locker	112 West 34th Street	Sept. 2031	12.8 years	34,192	0.3	%	6,258,212		1.2	%
Legg Mason	First Stamford Place	Sept. 2024	5.8 years	137,583	1.3	%	6,246,888		1.2	%
WDFG North America	Empire State Building	Dec. 2025	7.0 years	5,300	0.1	%	5,693,074		1.1	%
Shutterstock	Empire State Building	Apr. 2029	10.3 years	104,386	1.0	%	5,527,630		1.0	%
The Michael J. Fox Foundation	111West 33rd Street	Nov. 2029	10.9 years	86,492	0.8	%	5,330,672		1.0	%
ASCAP	250 West 57th Street	Aug. 2034	15.8 years	87,943	0.8	%	5,250,464		1.0	%
Kohl's	1400 Broadway	May 2029	10.4 years	118,516	1.1	%	5,216,894		1.0	%
The Gap, Inc.	111West 33rd Street, OGCP	Dec. 2018-Jan. 2030	5.3 years	83,408	0.8	%	4,770,844		0.9	%
On Deck Capital	1400 Broadway	Dec. 2018-Jan. 2026	8.0 years	81,290	0.8	%	4,503,015		0.8	%
Total				2,894,414	27.7	%	$	183,450,838	34.3	%

(1) Expiration dates are per lease and do not assume exercise of renewal or extension options. For tenants with more than two leases, the lease expiration is shown as a range.

(2) Represents the weighted average lease term, based on annualized rent.

(3) Based on leases signed and commenced as of December 31, 2018.

(4) Represents the percentage of rentable square feet of our office and retail portfolios in the aggregate.

39

(5) Represents annualized base rent and current reimbursement for operating expenses and real estate taxes.

(6) Represents the percentage of annualized rent of our office and retail portfolios in the aggregate.

Lease Expirations

We expect to benefit from the re-leasing of 6.1%, or approximately 464,792 rentable square feet, of our Manhattan office leases expiring during 2019, which we generally believe are currently at below-market rates. During 2016, 2017 and 2018, we generally obtained higher base rents on new and renewed leases at our Manhattan office properties. These increased rents are partly due to an increase in the total rentable square footage of such space as a result of remeasurement and application of market loss factors to our space.

The following table sets forth new and renewal leases entered into at our Manhattan office properties (excluding the retail component of these properties), the weighted average annualized cash rent per square foot of new and renewal leases executed during the year, the previous weighted average annualized cash rent prior to the renewal or re-leasing of these leases and the percent increase in mark-to market rent.

	Year Ended December 31,
	2018			2017			2016
New and renewal leases entered into during the year (square feet)	837,487			865,251			724,417
Average cash rent per square foot for new and renewal leases executed during the year	$	61.39		$	59.26		$	58.83
Average cash rent per square foot for previous leases	$	49.29		$	43.70		$	41.36
Increase in mark-to-market rent	24.5		%	35.6		%	42.2		%

The following tables set forth a summary schedule of the lease expirations for leases in place as of December 31, 2018 plus available space for each of the ten calendar years beginning with the year ending December 31, 2018 at the properties in our portfolio. The information set forth in the table assumes that tenants exercise no renewal options and all early termination rights.

All properties

			Percent of
		Rentable	Portfolio						Annualized
	Number	Square	Rentable				Percent of		Rent Per
	of Leases	Feet	Square Feet		Annualized		Annualized		Rentable
Year of Lease Expiration	Expiring (1)	Expiring (2)	Expiring		Rent (3)		Rent		Square Foot
Available	—	831,830	8.2	%	$	—	—	%	$	—
Signed leases not commenced	22	307,407	3.0	%	—		—	%	—
Fourth quarter 2018	17	114,473	1.1	%	6,041,172		1.1	%	52.77
2019	140	725,758	7.2	%	38,192,092		7.1	%	52.62
2020	136	841,127	8.3	%	46,705,137		8.7	%	55.53
2021	106	698,038	6.9	%	40,003,243		7.5	%	57.31
2022	96	540,111	5.3	%	34,473,377		6.4	%	63.83
2023	86	688,230	6.8	%	41,363,802		7.7	%	60.10
2024	62	608,298	6.0	%	34,863,683		6.5	%	57.31
2025	56	380,877	3.8	%	28,328,373		5.3	%	74.38
2026	42	951,180	9.4	%	52,892,285		9.9	%	55.61
2027	45	579,433	5.7	%	33,227,941		6.2	%	57.35
2028	28	977,740	9.7	%	52,696,279		9.8	%	53.90
Thereafter	62	1,884,337	18.6	%	126,700,550		23.8	%	67.24
Total	898	10,128,839	100.0	%	$	535,487,934	100.0	%	$	59.57

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Manhattan Office Properties ⁽⁴⁾ 

			Percent of
		Rentable	Portfolio						Annualized
	Number	Square	Rentable				Percent of		Rent Per
	of Leases	Feet	Square Feet		Annualized		Annualized		Rentable
Year of Lease Expiration	Expiring (1)	Expiring (2)	Expiring		Rent (3)		Rent		Square Foot
Available	—	549,316	7.3	%	$	—	—	%	$	—
Signed leases not commenced	17	294,114	3.9	%	—		—	%	—
Fourth quarter 2018	15	111,238	1.5	%	5,826,063		1.5	%	52.37
2019	105	464,792	6.1	%	25,249,960		6.7	%	54.33
2020	104	588,087	7.8	%	32,944,552		8.8	%	56.02
2021	67	457,024	6.0	%	25,385,479		6.7	%	55.55
2022	71	363,454	4.8	%	21,091,665		5.6	%	58.03
2023	62	507,038	6.7	%	28,776,689		7.6	%	56.75
2024	41	377,044	5.0	%	20,320,919		5.4	%	53.90
2025	36	241,506	3.2	%	14,120,004		3.8	%	58.47
2026	29	815,416	10.8	%	46,344,237		12.3	%	56.84
2027	31	427,431	5.7	%	23,440,994		6.2	%	54.84
2028	18	908,488	12.0	%	49,295,900		13.1	%	54.26
Thereafter	41	1,457,504	19.2	%	83,373,466		22.3	%	57.20
Total	637	7,562,452	100.0	%	$	376,169,928	100.0	%	$	55.99

Greater New York Metropolitan Area Office Properties

			Percent of
		Rentable	Portfolio						Annualized
	Number	Square	Rentable				Percent of		Rent Per
	of Leases	Feet	Square Feet		Annualized		Annualized		Rentable
Year of Lease Expiration	Expiring (1)	Expiring (2)	Expiring		Rent (3)		Rent		Square Foot
Available	—	220,095	11.9	%	$	—	—	%	$	—
Signed leases not commenced	4	9,373	0.5	%	—		—	%	—
Fourth quarter 2018	1	2,772	0.2	%	133,135		0.2	%	48.03
2019	29	234,759	12.7	%	8,990,325		13.6	%	38.30
2020	24	224,778	12.2	%	10,172,305		15.4	%	45.25
2021	31	210,934	11.4	%	9,586,651		14.5	%	45.45
2022	15	116,525	6.3	%	4,398,892		6.7	%	37.75
2023	14	126,488	6.8	%	5,752,523		8.7	%	45.48
2024	10	203,298	11.0	%	8,901,687		13.5	%	43.79
2025	12	102,046	5.5	%	3,275,709		5.0	%	32.10
2026	5	65,413	3.5	%	2,058,298		3.1	%	31.47
2027	6	64,229	3.5	%	2,340,864		3.5	%	36.45
2028	6	64,515	3.5	%	2,277,599		3.4	%	35.30
Thereafter	6	201,808	11.0	%	8,200,808		12.4	%	40.64
Total	163	1,847,033	100.0	%	$	66,088,796	100.0	%	$	40.86

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Retail ⁽⁵⁾ 

			Percent of
		Rentable	Portfolio						Annualized
	Number	Square	Rentable				Percent of		Rent Per
	of Leases	Feet	Square Feet		Annualized		Annualized		Rentable
Year of Lease Expiration	Expiring (1)	Expiring (2)	Expiring		Rent (3)		Rent		Square Foot
Available	—	62,419	8.7	%	$	—	—	%	$	—
Signed leases not commenced	—	3,920	0.5	%	—		—	%	—
Fourth quarter 2018	1	463	0.1	%	81,974		0.1	%	177.05
2019	6	26,207	3.6	%	3,951,807		4.2	%	150.79
2020	8	28,262	3.9	%	3,588,280		3.8	%	126.96
2021	8	30,080	4.2	%	5,031,113		5.4	%	167.26
2022	10	60,132	8.4	%	8,982,820		9.6	%	149.39
2023	10	54,704	7.6	%	6,834,590		7.3	%	124.94
2024	11	27,956	3.9	%	5,641,077		6.1	%	201.78
2025	8	37,325	5.2	%	10,932,660		11.7	%	292.90
2026	8	70,351	9.8	%	4,489,750		4.8	%	63.82
2027	8	87,773	12.2	%	7,446,083		8.0	%	84.83
2028	4	4,737	0.6	%	1,122,780		1.2	%	237.02
Thereafter	15	225,025	31.3	%	35,126,276		37.8	%	156.10
Total	97	719,354	100.0	%	$	93,229,210	100.0	%	$	142.77

The Empire State Building ⁽⁶⁾ 

			Percent of
		Rentable	Portfolio						Annualized
	Number	Square	Rentable				Percent of		Rent Per
	of Leases	Feet	Square Feet		Annualized		Annualized		Rentable
Year of Lease Expiration	Expiring (1)	Expiring (2)	Expiring		Rent (3) (7)		Rent		Square Foot
Available	—	135,233	5.0	%	$	—	—	%	$	—
Signed leases not commenced	4	19,313	0.7	%	—		—	%	—
Fourth quarter 2018	1	5,190	0.2	%	152,250		0.1	%	29.34
2019	15	57,671	2.1	%	3,166,194		2.1	%	54.90
2020	34	294,217	10.9	%	17,466,435		11.6	%	59.37
2021	21	131,888	4.9	%	7,736,154		5.1	%	58.66
2022	21	95,218	3.5	%	6,066,615		4.0	%	63.71
2023	19	103,564	3.8	%	6,505,861		4.3	%	62.82
2024	13	88,151	3.3	%	5,715,884		3.8	%	64.84
2025	8	68,349	2.5	%	3,838,791		2.6	%	56.16
2026	10	432,549	16.0	%	25,754,154		17.1	%	59.54
2027	6	22,615	0.8	%	1,398,330		0.9	%	61.83
2028	4	545,713	20.1	%	30,784,175		20.5	%	56.41
Thereafter	22	711,477	26.2	%	41,945,021		27.9	%	58.95
Total	178	2,711,148	100.0	%	$	150,529,864	100.0	%	$	58.88

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The Empire State Building Broadcasting Licenses and Leases

			Annualized				Percent of
	Annualized		Expense		Annualized		Annualized
Year of Lease Expiration	Base Rent (8)		Reimbursements		Rent (3)		Rent
Fourth quarter 2018	$	487,150	$	121,034	$	608,184	4.2	%
2019	212,240		44,297		256,537		1.8	%
2020	828,209		146,340		974,549		6.7	%
2021	55,685		105,905		161,590		1.1	%
2022	1,124,545		297,964		1,422,509		9.7	%
2023	82,480		25,301		107,781		0.7	%
2024	47,271		57,223		104,494		0.7	%
2025	1,496,090		208,282		1,704,372		11.7	%
2026	799,969		91,984		891,953		6.1	%
2027	768,750		67,825		836,575		5.7	%
2028	253,050		27,637		280,687		1.9	%
Thereafter	6,313,154		938,246		7,251,400		49.7	%
Total	$	12,468,593	$	2,132,038	$	14,600,631	100.0	%

(1) If a lease has two different expiration dates, it is considered to be two leases (for the purposes of lease count and square footage).

(2) Excludes (i) 179,350 rentable square feet across our portfolio attributable to building management use and tenant amenities and (ii) 69,789 square feet of space attributable to our observatory.

(3) Represents annualized base rent and current reimbursement for operating expenses and real estate taxes.

(4) Excludes (i) retail space in our Manhattan office properties and (ii) the Empire State Building broadcasting licenses and observatory operations.

(5) Includes an aggregate of 513,606 rentable square feet of retail space in our Manhattan office properties. Excludes the Empire State Building broadcasting licenses and observatory operations.

(6) Excludes retail space, broadcasting licenses and observatory operations.

(7) Includes approximately $6.4 million of annualized rent related to physical space occupied by broadcasting tenants for their broadcasting operations. Does not include license fees charges to broadcast tenants.

(8) Represents license fees for the use of the Empire State Building mast and base rent for the physical space occupied by broadcasting tenants.

Undeveloped Properties

We own entitled land that will support the development of Metro Tower, a 17-story, multi-tenanted commercial office building that is expected to comprise approximately 380,000 rentable square feet on 13 floors of office space. The site is directly adjacent to Metro Center, one of our office properties, and the Stamford Transportation Center. All required zoning approvals have been obtained to allow for development of Metro Tower. We intend to develop Metro Tower when we deem the appropriate combination of local market and other conditions are in place.

Redevelopment and Repositioning

From 2002 through 2006, we gradually gained full control of the day-to-day management of our Manhattan office properties (with the estate of Leona M. Helmsley previously holding certain approval rights at some of these properties as a result of its interest in the entities owning the properties). Since then, we have been undertaking a comprehensive redevelopment and repositioning strategy of our Manhattan office properties that has included the physical improvement through upgrades and modernization of, and tenant upgrades in, such properties. Since we assumed full control of the day-to-day management of our Manhattan office properties beginning with One Grand Central Place in 2002, and through December 31, 2018, we have invested a total of approximately $865.7 million (excluding tenant improvement costs and leasing commissions) in our Manhattan office properties pursuant to this program. We intend to fund capital improvements through a combination of operating cash flow, cash on hand, short term investments and borrowings.

These improvements, within our redevelopment and repositioning program, 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. These improvements are designed to improve the overall value and attractiveness of our properties and have 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. We have also aggregated smaller spaces in order to offer larger blocks of

43

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.

During the second quarter of 2017, we commenced a multi-year capital project at the Empire State Building which we believe will improve convenience for office tenants and their visitors, increase the value of our 34th Street facing retail space, enhance the Observatory visitor experience, and increase Observatory revenue per capita.

In the first phase of the project, which we completed in August 2018, we relocated the present Observatory entrance, previously located on Fifth Avenue, to a new, larger, dedicated entrance for Observatory visitors at the western side of the Empire State Building on 34th Street. The new entrance eliminates Observatory visitor flow into the Fifth Avenue lobby and streamlines such visitor exit from that lobby, thereby reducing Observatory traffic in such lobby by more than 50% and improving Fifth Avenue access for our office tenants and their visitors. We believe the resulting new traffic pattern will increase the value of all of our 34th Street facing retail space and enhance office and Observatory convenience.

We anticipate that we will invest approximately $163 million in total over three years to complete all phases of this project. Expenditures, which began during the second quarter 2017, were $91.3 million through December 31, 2018. This investment is an outcome of continually looking at ways to innovate and enhance the office and retail tenant and visitor experience at the Empire State Building.

The greater New York Metropolitan Area office market is soft, and we compete with properties that have been redeveloped recently or have planned redevelopment. We expect to spend approximately $40 million through 2020 on these well-maintained and well-located properties’ common areas and amenities to ensure competitiveness and protect our market position. Expenditures, which began during the second quarter 2018, were $14.1 million through December 31, 2018.

ITEM 3. LEGAL PROCEEDINGS

Please see Note 8 “Commitments and Contingencies” to the financial statements of this Annual Report in Form 10-K for a description of such legal proceedings.

ITEM 4. MINE SAFETY DISCLOSURE

Not applicable.

44

PART II

ITEM 5. MARKET FOR REGISTRANT'S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

Market Information

We have four series of partnership units ("OP Units") - Series PR OP Units, Series ES OP Units, Series 60 OP Units and Series 250 OP Units. The Series ES OP Units, Series 60 OP Units and Series 250 OP Units (together the "traded OP units") are listed on the NYSE Arca, Inc. exchange ("NYSE Arca") under the symbols "ESBA," "OGCP," and "FISK," respectively. The Series PR OP Units are not listed on any exchange and are not traded.

On February 22, 2019, the last sales price for our Series ES OP Units on the NYSE Arca was $15.51 per share. On February 22, 2019, the last sales price for our Series 60 OP Units on the NYSE Arca was $15.53 per share. On February 22, 2019, the last sales price for our Series 250 OP Units on the NYSE Arca was $15.38 per share.

Holders

As of February 22, 2019, we had approximately 748 registered holders of Series PR OP Units, 1,706 registered holders of Series ES OP Units, 547 registered holders of Series 60 OP Units and 376 registered holders of Series 250 OP Units. Such information was obtained through our registrar and transfer agent. Certain shares and OP Units are held in "street" name and accordingly, the number of beneficial owners of such shares and OP Units is not known or included in the foregoing number.

Distributions

ESRT intends to pay regular quarterly dividends to holders of its Class A common stock and Class B common stock and we intend to make regular quarterly distributions to our securityholders. Any distributions we or ESRT pay in the future will depend upon our actual results of operations, economic conditions and other factors that could differ materially from our current expectations. Our actual results of operations will be affected by a number of factors, including the revenue we receive from our properties, our operating expenses, interest expense, the ability of our tenants to meet their obligations and unanticipated expenditures. Distributions declared by us will be authorized by ESRT's board of directors in its sole discretion out of funds legally available therefore and will be dependent upon a number of factors, including restrictions under applicable law, our capital requirements and the distribution requirements necessary to maintain ESRT's qualification as a REIT. See Item 1A, "Risk Factors," and Item 7, "Management's Discussion and Analysis of Financial Conditions and Results of Operations," of this Annual Report on Form 10-K, for information regarding the sources of funds used for dividends and for a discussion of factors, if any, which may adversely affect our ability to make distributions to our securityholders.

Securities Authorized For Issuance Under Equity Compensation Plans

During 2013, we adopted the Empire State Realty Trust, Inc. Empire State Realty OP, L.P. 2013 Equity Incentive Plan, as amended and restated as of April 4, 2016 (the "Plan"). The Plan provides for grants of stock options, shares of restricted ESRT Class A common stock, dividend equivalent rights and other equity-based awards, including LTIP Units, up to an aggregate of 12.2 million shares of our common stock. For a further discussion of the Plan, see Note 9 to the consolidated financial statements included under Item 8 "Financial Statements and Supplementary Data" of this Annual Report on Form 10-K.

45

The following table presents certain information about our equity compensation plans as of December 31, 2018:

	Number of securities to be issued upon exercise of outstanding options, warrants and rights	Weighted-average exercise price of outstanding options, warrants and rights	Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in the first column of this table)
Plan Category
Equity compensation plans approved by securityholders	N/A	N/A	4,323,054
Equity compensation plans not approved by securityholders	—	—	—
Total	N/A	N/A	4,323,054

As of December 31, 2018, we issued 282,631 shares of restricted stock and 7,614,830 LTIP units under the Plan.

Recent Sales of Unregistered Securities Use of Proceeds from Registered Securities; Repurchases

During the second quarter of 2018, pursuant to an August 2016 Stockholders Agreement between ESRT and QIA (the

“Stockholders Agreement”), ESRT sold 284,015 shares of ESRT Class A common stock (the “Top Up Shares”) to QIA pursuant

to its “top-up” right to acquire its 9.9% pro rata share of new equity securities issued during the first quarter of 2018 (in this

case, equity compensation). The aggregate purchase price which QIA paid to ESRT for the Top Up Shares was $4.7 million, or

$16.72 per share of ESRT Class A common stock, in accordance with a formula in the Stockholders Agreement equal to the

average closing price per share during the five (5) consecutive trading days immediately preceding the issuance of the

applicable new equity securities.

46

ITEM 6. SELECTED FINANCIAL DATA.

The following table sets forth our selected financial data and should be read in conjunction with our Financial Statements and notes thereto included in Item 8, "Financial Statements and Supplementary Data" and Item 7, "Management's Discussion and Analysis of Financial Condition and Results of Operations" in this Annual Report on Form 10-K.

	Year Ended December 31,
(amounts in thousands, except per share data)	2018			2017			2016			2015			2014
Operating Data
Total revenues	$	731,511		$	709,526		$	677,353		$	657,534		$	635,267
Operating expenses:
Property operating expenses	167,379			163,531			153,850			158,638			148,676
Ground rent expenses	9,326			9,326			9,326			9,326			5,339
General and administrative expenses	52,674			50,315			49,078			38,073			39,037
Observatory expenses	32,767			30,275			29,833			32,174			31,413
Construction expenses	—			—			—			3,222			38,596
Real estate taxes	110,000			102,466			96,061			93,165			82,131
Acquisition expenses	—			—			98			193			3,382
Depreciation and amortization	168,508			160,710			155,211			171,474			145,431
Total operating expenses	540,654			516,623			493,457			506,265			494,005
Operating income (loss)	190,857			192,903			183,896			151,269			141,262
Other income (expense):
Interest income	10,661			2,942			647			100			59
Interest expense	(79,623		)	(68,473		)	(70,595		)	(65,743		)	(62,685		)
Loss on early extinguishment of debt	—			(2,157		)	(552		)	(1,749		)	(3,771		)
Loss from derivative financial instruments	—			(289		)	—			—			—
Income before income taxes	121,895			124,926			113,396			83,877			74,865
Income tax expense	(4,642		)	(6,673		)	(6,146		)	(3,949		)	(4,655		)
Net income	117,253			118,253			107,250			79,928			70,210
Private perpetual preferred unit distributions	(936		)	(936		)	(936		)	(936		)	(476		)
Net income attributable to common unitholders	$	116,317		$	117,317		$	106,314		$	78,992		$	69,734
Distribution declared and paid per unit	$	0.42		$	0.42		$	0.40		$	0.34		$	0.34
Net income per common unit - basic and diluted	$	0.39		$	0.39		$	0.38		$	0.29		$	0.27
Total weighted average units - basic	297,258			296,455			276,848			265,914			254,506
Total weighted average units - diluted	297,259			298,049			277,568			265,914			254,506
Balance Sheet Data
Commercial real estate properties, at cost	$	2,884,486		$	2,667,655		$	2,458,629		$	2,276,330		$	2,139,863
Total assets	$	4,195,780		$	3,931,347		$	3,890,953		$	3,300,650		$	3,283,497
Debt	$	1,918,933		$	1,688,721		$	1,612,331		$	1,632,416		$	1,598.654
Partners' capital	$	1,991,109		$	1,977,737		$	1,982,863		$	1,372,686		$	1,381,097
Other Data
Funds from operations attributable to common stockholders and non-controlling interests (1)	$	282,609		$	276,491		$	260,519		$	249,924		$	214,849
Modified funds from operations attributable to common stockholders and non-controlling interests (2)	$	290,440		$	284,322		$	268,350		$	257,755		$	219,452
Core funds from operations attributable to common stockholders and non-controlling interests (3)	$	290,440		$	286,925		$	269,000		$	257,677		$	227,422
Net cash provided by operating activities	$	279,022		$	194,202		$	214,755		$	208,675		$	148,057
Net cash used in investing activities	$	(643,023	)	$	(223,013	)	$	(182,376	)	$	(142,197	)	$	(303,904	)
Net cash provided by (used in) financing activities	$	104,617		$	(56,877	)	$	470,941		$	(59,918	)	$	145,488

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______________

(1) We compute Funds From Operations ("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 writedowns of investments in depreciable real estate and investments in in-substance real estate investments, gains or losses from debt restructurings and sales of depreciable operating properties, plus real estate-related depreciation and amortization (excluding amortization of deferred financing costs), less distributions to non-controlling interests and gains/losses from discontinued operations and after adjustments for unconsolidated partnerships and joint ventures. FFO is a widely recognized non-GAAP financial measure for REITs that we believe, when considered with financial statements determined in accordance with GAAP, is useful to investors in understanding financial performance and providing a relevant basis for comparison among REITs. In addition, FFO is useful to investors as it captures features particular to real estate performance by recognizing that real estate has generally appreciated over time or maintains residual value to a much greater extent than do other depreciable assets. Investors should review FFO, along with GAAP net income, when trying to understand an equity REIT’s operating performance. We present FFO because we consider it an important supplemental measure of our operating performance and believe that it is frequently used by securities analysts, investors and other interested parties in the evaluation of REITs. However, because FFO excludes depreciation and amortization and captures neither the changes in the value of our properties that result from use or market conditions nor the level of capital expenditures and leasing commissions necessary to maintain the operating performance of our properties, all of which have real economic effect and could materially impact our results from 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. For a reconciliation of FFO, see "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations - Funds from Operations."

(2) Modified FFO adds back an adjustment for any above or below-market ground lease amortization to traditionally defined FFO. We consider this a useful supplemental measure in evaluating our operating performance due to the non-cash accounting treatment under GAAP, which stems from the third quarter 2014 acquisition of two option properties following our formation transactions 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.

(3) Core FFO adds back to traditionally defined FFO the following items: acquisition expenses, severance expenses and retirement equity compensation expenses, private perpetual preferred exchange offering expenses, deferred tax asset write-off, acquisition expenses, loss on early extinguishment of debt, gain on settlement of lawsuit related to the Observatory, net of income taxes and ground lease amortization, construction severance expenses and acquisition break-up fee. We present Core FFO because we consider it an important supplemental measure of our operating performance in that it excludes items associated with the Offering and formation transactions. There can be no assurance that Core FFO presented by us 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. For a reconciliation of Core FFO, see "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations - Core Funds from Operations."

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ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K contains forward-looking statements within the meaning of Section 27A of the Securities Act, and Section 21E of the Exchange Act. For these statements, we claim the protections of the safe harbor for forward-looking statements contained in such Section. Forward-looking statements are subject to substantial risks and uncertainties, many of which are difficult to predict and are generally beyond our control. 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 involve numerous risks and uncertainties and you should not rely on them as predictions of future events. 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. 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:

• the factors included in this Annual Report on Form 10-K, including those set forth under the heading "Business," Risk Factors," and "Management’s Discussion and Analysis of Financial Condition and Results of Operations";

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

• resolution of legal proceedings involving the company;

• reduced demand for office or retail space;

• fluctuations in attendance at the observatory and adverse weather;

•new office or observatory development in our market;

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

• changes in our business strategy;

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

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

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

• 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;

• inability to continue to raise additional debt or equity financing on attractive terms, or at all;

• our leverage;

• decreased rental rates or increased vacancy rates;

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

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

• difficulties in identifying properties to acquire and completing acquisitions;

• risks of real estate development and capital projects, including construction delays and cost overruns;

• inability to manage our properties and our growth effectively;

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

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

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

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

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

• lack or insufficient amounts of insurance;

• misunderstanding of our competition;

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

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

49

• damages resulting from security breaches through cyberattacks, cyber intrusions or otherwise, as well as other significant disruptions of our technology (IT) networks related systems.

While forward-looking statements reflect our good faith beliefs, they are not guarantees of future performance. Actual results may differ materially from our current projection. We disclaim any obligation to publicly update or revise any forward-looking statement to reflect changes in underlying assumptions or factors, of new information, data or methods, future events or other changes after the date of this Annual Report on Form 10-K, 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 section entitled “Risk Factors" of this Annual Report on Form 10-K. You should not place undue reliance on any forward-looking statements, which are based only on information currently available to us.    

Overview

Unless the context otherwise requires or indicates, references in this section to our company, we, our and us refer to (i) Empire State Realty OP, L.P. and its consolidated subsidiaries.

The following discussion and analysis should be read in conjunction with "Selected Financial Data," and our consolidated financial statements as of December 31, 2018 and 2017 and for the years ended December 31, 2018, 2017 and 2016 and the notes related thereto which are included in this Annual Report on Form 10-K.

2018 Highlights

• Achieved net income attributable to the Company of $117.3 million.

• Core FFO was $290.4 million.

• Occupancy and leased percentages at December 31, 2018:

• Total portfolio was 88.8% occupied; including signed leases not commenced (“SLNC”), the total portfolio was 91.8% leased.

• Manhattan office portfolio (excluding the retail component of these properties) was 88.8% occupied; including SLNC, the Manhattan office portfolio was 92.7% leased.

• Retail portfolio was 90.8% occupied; including SLNC, the retail portfolio was 91.3% leased.

• Empire State Building was 93.4% occupied; including SLNC, the Empire State Building was 94.1% leased.

• Signed 156 leases, representing 1,003,806 rentable square feet across the total portfolio, achieving a 19.8% increase in mark-to-market cash rent over previous fully escalated cash rents on new, renewal, and expansion leases; 122 of these leases, representing 837,487 rentable square feet, were within the Manhattan office portfolio (excluding the retail component of these properties), achieving a 24.5% increase in mark-to-market cash rent over previous fully escalated cash rents on new, renewal and expansion leases.

• Signed 78 new leases representing 729,026 rentable square feet in 2018 for the Manhattan office portfolio (excluding the retail component of these properties), achieving an increase of 27.3% in mark-to-market cash rent over expired previous fully escalated cash rents.

• Amended our lease with our largest tenant and in the process increased our annual cash rent by approximately $4 million.

• Realized lease termination fee income of $20.8 million, or approximately $0.07 per fully diluted share, from a combination of broadcast and office tenants. This fee income was partially offset by the write-off of straight line rent receivables associated with the terminated leases of $2.1 million, or approximately $0.01 per fully diluted share.

• Opened the new Observatory entrance, which is the first phase of the fully reimagined Observatory experience.

• Achieved Empire State Building Observatory revenue growth of 3.2% to $131.2 million from $127.1 million in 2017 while net operating income increased 1.7% due to improved pricing partially offset by increased expenses related to Observatory redevelopment and public relations expense allocations.

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• Issued long-term, fixed rate unsecured financing of $335 million that increased weighted average term to maturity to 8.1 years, from 6.2 years, at December 31, 2017.

• Authorized a $500 million stock and publicly traded operating partnership unit repurchase program through December 31, 2019.

• Declared and paid aggregate dividends of $0.42 per share during 2018.

As of December 31, 2018, 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 513,606 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 1.8 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 December 31, 2018, our portfolio included four standalone retail properties located in Manhattan and two standalone retail properties located in the city center of Westport, Connecticut, encompassing 205,748 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% to 18% 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):

	Year Ended December 31,
	2018				2017
Office leases	$	130,583	38.9	%	$	127,389	40.5	%
Retail leases	7,483		2.2	%	7,932		2.5	%
Tenant reimbursements, lease termination fees and other income	44,264		13.2	%	26,541		8.5	%
Observatory operations	131,227		39.0	%	127,118		40.4	%
Broadcasting licenses and leases	22,401		6.7	%	25,538		8.1	%
Total	$	335,958	100.0	%	$	314,518	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 December 31, 2018, we have invested a total of approximately $865.7 million (excluding tenant improvement costs and leasing commissions) in our Manhattan office properties pursuant to this program. We intend to fund these capital improvements through a combination of operating cash flow, cash on hand, short term investments and borrowings.

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During the second quarter 2017, we commenced a multi-year capital project at the Empire State Building which we believe will improve convenience for office tenants and their visitors, increase the value of our 34th Street facing retail space, enhance the Observatory visitor experience, and increase Observatory revenue per capita.

In the first phase completed in August 2018 we relocated the Observatory entrance, previously located on Fifth Avenue, to a new, larger, dedicated entrance for Observatory visitors at the western side of the Empire State Building on 34th Street. The new entrance eliminates Observatory visitor flow into the Fifth Avenue lobby and streamlines such visitor exit from that lobby, thereby reducing Observatory traffic in such lobby by more than 50% and improving Fifth Avenue access for our office tenants and their visitors. We believe the resulting new traffic pattern will increase the value of all of our 34th Street facing retail space and enhance office and Observatory convenience.

We anticipate that we will invest approximately $163 million in total over three years to complete all phases of this project. Expenditures, which began during the second quarter 2017, were $91.3 million through December 31, 2018. This investment is an outcome of continually looking at ways to innovate and enhance the office and retail tenant and visitor experience at the Empire State Building.

The elevator servicing the 102nd floor Observatory was closed to visitors during the first quarter of 2018 for planned replacement of the original machinery and a new glass cab for the elevator which serves it. We have more work to do on the 102nd floor component of our Observatory upgrade program and we closed the 102nd floor in January 2019. The 102nd floor may stay closed for as long as nine months during the upgrade. Revenue for the 102nd floor observatory was $11.4 million in 2017 and $8.6 million in 2018.

The Greater New York Metropolitan Area office market is soft, and we compete with properties that have been redeveloped recently or have planned redevelopment. We expect to spend approximately $40 million through 2020 on these well-maintained and well-located properties’ common areas and amenities to ensure competitiveness and protect our market position. Expenditures, which began during the second quarter 2018, were $14.1 million through December 31, 2018.

As of December 31, 2018, excluding principal amortization, we had approximately $250.0 million of debt maturing in 2019 and no debt maturing in 2020, and we had total debt outstanding of approximately $1.9 billion, with a weighted average interest rate of 3.84% (excluding premiums and discount) and a weighted average maturity of 8.1 years and 100.0% of which is fixed-rate indebtedness. As of December 31, 2018, we had cash and cash equivalents and short-term investments of $605.0 million. Our consolidated net debt to total market capitalization was approximately 23.4% as of December 31, 2018.

Results of Operations

Overview

The discussion below relates to the financial condition and results of operations for the years ended December 31, 2018, 2017, and 2016.

Year Ended December 31, 2018 Compared to the Year Ended December 31, 2017

The following table summarizes the historical results of operations for the years ended December 31, 2018 and 2017 (amounts in thousands):

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	Years Ended December 31,
	2018			2017			Change			%
Revenues:
Rental revenue	$	493,231		$	483,944		$	9,287		1.9	%
Tenant expense reimbursement	72,372			73,679			(1,307		)	(1.8	)%
Observatory revenue	131,227			127,118			4,109			3.2	%
Lease termination fees	20,847			13,551			7,296			53.8	%
Third-party management and other fees	1,440			1,400			40			2.9	%
Other revenues and fees	12,394			9,834			2,560			26.0	%
Total revenues	731,511			709,526			21,985			3.1	%
Operating expenses:
Property operating expenses	167,379			163,531			(3,848		)	(2.4	)%
Ground rent expenses	9,326			9,326			—			—	%
General and administrative expenses	52,674			50,315			(2,359		)	(4.7	)%
Observatory expenses	32,767			30,275			(2,492		)	(8.2	)%
Real estate taxes	110,000			102,466			(7,534		)	(7.4	)%
Depreciation and amortization	168,508			160,710			(7,798		)	(4.9	)%
Total operating expenses	540,654			516,623			(24,031		)	(4.7	)%
Operating income	190,857			192,903			(2,046		)	(1.1	)%
Other income (expense):
Interest income	10,661			2,942			7,719			262.4	%
Interest expense	(79,623		)	(68,473		)	(11,150		)	(16.3	)%
Loss on early extinguishment of debt	—			(2,157		)	2,157			100.0	%
Loss from derivative financial instruments	—			(289		)	289			100.0	%
Income before income taxes	121,895			124,926			(3,031		)	(2.4	)%
Income tax expense	(4,642		)	(6,673		)	2,031			30.4	%
Net income	117,253			118,253			(1,000		)	(0.8	)%
Private perpetual preferred unit distributions	(936		)	(936		)	—			—	%
Net income attributable to common unit holders	$	116,317		$	117,317		$	(1,000	)	(0.9	)%

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 reduction in broadcasting expense reimbursements.

Observatory Revenue

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

ticket price, partially offset by the scheduled closure of the 102nd floor observation deck in the first quarter 2018 for

replacement of original elevator machinery.

Lease Termination Fees

The year ended December 31, 2018 included significantly higher lease termination fees, from a combination of broadcast and office tenants, compared to the year ended December 31, 2017.

Third-Party Management and Other Fees

Third-party management and other fees were consistent with 2017.

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Other Revenues and Fees

The increase in other revenues and fees for the year ended December 31, 2018 was primarily due to a $2.8

million settlement with a former broadcast tenant.

Property Operating Expenses

The increase in property operating expenses was primarily due to higher repairs and maintenance costs and higher labor costs.

Ground Rent Expenses

The ground rent expense was consistent with 2017.

General and Administrative Expenses

The increase in general and administrative expenses was primarily due to increased equity compensation expense.

Observatory Expenses

The increase in Observatory expenses was primarily due to higher payroll costs of $0.8 million, higher technology costs of $0.7 million and higher marketing costs of $0.6 million.

Real Estate Taxes

The increase in real estate taxes was primarily attributable to higher assessed values for multiple properties.

Depreciation and Amortization

The increase in depreciation and amortization was primarily due to depreciation of assets newly placed in service together with the accelerated depreciation of retired assets, partially offset by lower amortization of purchase accounting deferred leasing costs associated with 2013 and 2014 acquisitions as these costs become fully amortized.

Interest Income

Interest income increased primarily due to higher interest rates on cash balances and short term investments.

Interest Expense

Interest expense increased due to higher outstanding principal balances.

Loss on Early Extinguishment of Debt

There was no loss on early extinguishment of debt for the year ended December 31, 2018.

Loss from Derivative Financial Instruments

There was no loss from derivative financial instruments for the year ended December 31, 2018.

Income Taxes

The decrease in income tax expense was primarily attributable to a reduction in the federal corporate tax rate.

Private Perpetual Preferred Unit Distributions

The private perpetual preferred unit distributions were consistent with 2017.

Year Ended December 31, 2017 Compared to the Year Ended December 31, 2016

The following table summarizes the historical results of operations for years ended December 31, 2017 and 2016 (amounts in thousands):

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	Years Ended December 31,
	2017			2016			Change			%
Revenues:
Rental revenue	$	483,944		$	460,653		$	23,291		5.1	%
Tenant expense reimbursement	73,679			73,459			220			0.3	%
Observatory revenue	127,118			124,814			2,304			1.8	%
Lease termination fees	13,551			7,676			5,875			76.5	%
Third-party management and other fees	1,400			1,766			(366		)	(20.7	)%
Other revenues and fees	9,834			8,985			849			9.4	%
Total revenues	709,526			677,353			32,173			4.7	%
Operating expenses:
Property operating expenses	163,531			153,850			(9,681		)	(6.3	)%
Ground rent expenses	9,326			9,326			—			—	%
General and administrative expenses	50,315			49,078			(1,237		)	(2.5	)%
Observatory expenses	30,275			29,833			(442		)	(1.5	)%
Real estate taxes	102,466			96,061			(6,405		)	(6.7	)%
Acquisition expenses	—			98			98			100.0	%
Depreciation and amortization	160,710			155,211			(5,499		)	(3.5	)%
Total operating expenses	516,623			493,457			(23,166		)	(4.7	)%
Operating income	192,903			183,896			9,007			4.9	%
Other income (expense):
Interest income	2,942			647			2,295			354.7	%
Interest expense	(68,473		)	(70,595		)	2,122			3.0	%
Loss on early extinguishment of debt	(2,157		)	(552		)	(1,605		)	(290.8	)%
Loss from derivative financial instruments	(289		)	—			(289		)	—	%
Income before income taxes	124,926			113,396			11,530			10.2	%
Income tax (expense) benefit	(6,673		)	(6,146		)	(527		)	(8.6	)%
Net income	118,253			107,250			11,003			10.3	%
Private perpetual preferred unit distributions	(936		)	(936		)	—			—	%
Net income attributable to common unitholders	$	117,317		$	106,314		$	11,003		10.3	%

Rental Revenue

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

Tenant Expense Reimbursement

Tenant expense reimbursements were consistent with 2016.

Observatory Revenue

Observatory revenues were higher primarily due to an improvement in our ticket mix and higher per person average ticket price. The increase was partially offset by an increased number of bad weather days.

Lease Termination Fees

Lease termination fee income increased in 2017 as there were more tenants with higher lease termination fees for the year ended December 31, 2017 compared to the year ended December 31, 2016.

Third-Party Management and Other Fees

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

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Other Revenues and Fees

The increase in other revenues and fees was primarily due to a real estate tax refund of $1.1 million.

Property Operating Expenses

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

Ground Rent Expenses

The ground rent expense was consistent with 2016.

General and Administrative Expenses

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

Observatory Expenses

The increase in Observatory expenses was primarily due to higher payroll and repair and maintenance costs, partially offset by lower marketing costs.

Real Estate Taxes

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

Acquisition Expenses

No acquisition expenses were incurred in 2017.

Depreciation and Amortization

The increase in depreciation and amortization was primarily attributable to assets that were placed in service towards the end of 2016 and hence, subject to a full year's depreciation for the year ended December 31, 2017.

Interest Income

Interest income increased due to higher average cash balances during 2017 as compared to 2016. Cash proceeds from issuance of shares were received in the second half of 2016.

Interest Expense

Interest expense declined due to lower interest rates on new mortgage loan refinancings which occurred during the year ended December 31, 2017.

Loss on Early Extinguishment of Debt

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

Loss from Derivative Financial Instruments

The loss from derivative financial instruments consists of the ineffectiveness attributable to a partial termination and re-designation of related cash flow hedges during the year ended December 31, 2017.

Income Taxes

The increase in income tax expense was attributable to a write-off of a deferred tax asset resulting from the reduction of the federal corporate tax rate from 34% to 21%.

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Private Perpetual Preferred Unit Distributions

The private perpetual preferred unit distributions were consistent with 2016.

Liquidity and Capital Resources

Liquidity is a measure of our ability to meet potential cash requirements, including ongoing commitments to repay borrowings, fund and maintain our assets and operations, including lease-up costs, fund our redevelopment and repositioning programs, acquire properties, make distributions to our securityholders and other general business needs. Based on the historical experience of our management and our business strategy, in the foreseeable future we anticipate we will generate positive cash flows from operations. In order for ESRT to qualify as a REIT, ESRT is required under the Code to distribute to its securityholders, 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. 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, short term investments, cash generated from our operating activities, debt issuances and unused borrowing capacity under our unsecured revolving credit and term loan facility. We expect to meet our short-term liquidity requirements, including distributions, operating expenses, working capital, debt service, and capital expenditures from cash flows from operations, cash and short term investments, debt issuances, and available borrowing capacity under our unsecured revolving credit and term loan 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, short term investments, our unsecured revolving credit and term loan 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 December 31, 2018, we had approximately $605.0 million available in cash and cash equivalents and short-term investments and there was $1.1 billion available under our unsecured revolving credit facility.

Through August 2021, QIA will have a 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 in real estate investment opportunities. 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 December 31, 2018, we had approximately $1.9 billion of total consolidated indebtedness outstanding, with a weighted average interest rate of 3.84% and a weighted average maturity of 8.1 years. As of December 31, 2018, exclusive of principal amortization, we have approximately $250.0 million of debt maturing in 2019 and no debt maturing in 2020. Our consolidated net debt to total market capitalization was approximately 23.4% as of December 31, 2018.

During January 2018, we refinanced and increased our mortgage debt on 1333 Broadway from $66.6 million to $160.0 million, due February 2033 with interest fixed at 4.21%. A portion of this increase was applied to release the $75.8 million mortgage lien on 1400 Broadway.

During December 2017, we entered into an agreement to issue and sell an aggregate principal amount of $450 million of our senior unsecured notes in a private placement, of which $115 million was sold and purchased in December 2017 and $335 million was sold and purchased in March 2018. We used the net proceeds from the March 2018 issuance to repay our mortgage indebtedness on 111 West 33rd Street and 1350 Broadway and to add to cash balances.

Given our current liquidity, including availability under our unsecured revolving credit and term loan facility, we believe we will be able to refinance future maturing debt.

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Unsecured Revolving Credit and Term Loan Facility

During August 2017, we entered into an amended and restated senior unsecured revolving credit and term loan facility with Bank of America, N.A., as administrative agent, Merrill Lynch, Pierce, Fenner & Smith Incorporated and Wells Fargo Securities, LLC as Joint Lead Arrangers and Joint Bookrunners, Wells Fargo, National Association and Capital One, National Association, as co-syndication agents, and the lenders party thereto.

Amount. The unsecured revolving credit and term loan facility is comprised of a $1.1 billion revolving credit facility and a $265 million term loan facility. The new revolving facility replaced our existing credit facility which was due to mature in January 2019 and was undrawn at the time of the amendment. The term loan facility was borrowed in full at closing and used to repay an existing $265 million term loan. The unsecured revolving credit and term loan facility contains an accordion feature that would allow us to increase the maximum aggregate principal amount to $1.75 billion under specified circumstances.

Guarantors. Certain of our subsidiaries are guarantors of our obligations under the unsecured revolving credit and term loan facility.

Interest. Amounts outstanding under the (a) term loan facility bear interest at a floating rate equal to, at our election, (x) the Eurodollar rate, plus a spread that we expect will range from 0.900% to 1.800% depending upon our leverage ratio and credit rating, or (y) a base rate, plus a spread that we expect will range from 0.000% to 0.800% depending upon our leverage ratio and credit rating and (b) revolving credit facility bear interest at a floating rate equal to, at our election, (x) the Eurodollar rate, plus a spread that we expect will range from 0.825% to 1.550% depending upon our leverage ratio and credit rating or (y) a base rate, plus a spread that we expect will range from 0.000% to 0.550% depending upon our leverage ratio and credit rating.

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

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

As of December 31, 2018, we were in compliance with the covenants, as described below (dollars in thousands):

Financial Covenant	Required		December 31, 2018			In Compliance
Maximum total leverage	< 60%		24.4		%	Yes
Maximum secured debt	< 40%		7.7		%	Yes
Minimum fixed charge coverage	> 1.50x		4.8x			Yes
Minimum unencumbered interest coverage	> 1.75x		7.1x			Yes
Maximum unsecured leverage	< 60%		19.1		%	Yes
Minimum tangible net worth	$	1,252,954	$	1,803,812		Yes

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

Events of Default. The unsecured revolving credit and term loan facility contains customary events of default (subject in certain cases to specified cure periods), including but not limited to non-payment, breach of covenants,

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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 (defined in the definitive documentation for the unsecured revolving credit and term loan facility).

Senior Unsecured Notes

During December 2017, we entered into an agreement to issue and sell an aggregate principal amount of $450.0 million of senior unsecured notes (“Series D, E and F Senior Notes”) in a private placement to entities affiliated with Prudential Capital Group, AIG Asset Management, MetLife Investment Advisors, LLC and Teachers Insurance and Annuity Association of America. The Series D, E and F Senior Notes consist of $115.0 million of 4.08% Series D Senior Notes due 2028, $160.0 million of 4.26% Series E Senior Notes due 2030, and $175.0 million of 4.44% Series F Senior Notes due 2033. We issued and sold the Series D Senior Notes in December 2017 and the Series E and F Senior Notes in March 2018.

The Senior Unsecured Notes are senior unsecured obligations and are unconditionally guaranteed by each of our subsidiaries that guarantees indebtedness under the unsecured revolving credit and term loan facility. Interest on the Senior Unsecured Notes is payable quarterly.

The terms of the Senior Unsecured Notes include customary covenants, including limitations on liens, investment, debt, fundamental changes, and transactions with affiliates and require certain customary financial reports. The Senior Unsecured Notes also require 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, and a maximum unsecured leverage ratio. As of December 31, 2018, we were in compliance with the covenants under the outstanding Senior Unsecured Notes.

Mortgage Debt

As of December 31, 2018, we had mortgage notes payable, net of $608.6 million.

During January 2018, we refinanced and increased our mortgage debt on 1333 Broadway from $66.6 million to $160.0 million, due February 2033 with interest fixed at 4.21%. A portion of this increase was applied to release the $75.8 million mortgage lien on 1400 Broadway.

During March 2018, we repaid our mortgage indebtedness on 111 West 33rd Street and 1350 Broadway.

Leverage Policies

We expect to employ leverage in our capital structure in amounts determined from time to time by our 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 depends on our mix of investments and the cost of leverage, however, we 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⁾

	Years Ended December 31,
Total New Leases, Expansions, and Renewals	2018		2017		2016
Number of leases signed(2)	149		155		187
Total square feet	991,576		1,198,340		941,008
Leasing commission costs(3)	$	19,523	$	22,836	$	15,408
Tenant improvement costs(3)	69,886		83,051		55,088
Total leasing commissions and tenant improvement costs(3)	$	89,409	$	105,887	$	70,496
Leasing commission costs per square foot(3)	$	19.69	$	19.06	$	16.37
Tenant improvement costs per square foot(3)	70.48		69.31		58.54
Total leasing commissions and tenant improvement costs per square foot(3)	$	90.17	$	88.37	$	74.91

Retail Properties⁽⁴⁾

	Years Ended December 31,
Total New Leases, Expansions, and Renewals	2018		2017		2016
Number of leases signed(2)	7		12		20
Total Square Feet	12,230		95,360		50,798
Leasing commission costs(3)	$	331	$	4,418	$	2,847
Tenant improvement costs(3)	559		2,989		4,744
Total leasing commissions and tenant improvement costs(3)	$	890	$	7,407	$	7,591
Leasing commission costs per square foot(3)	$	27.08	$	46.33	$	56.03
Tenant improvement costs per square foot(3)	45.71		31.35		93.40
Total leasing commissions and tenant improvement costs per square foot(3)	$	72.79	$	77.68	$	149.43

_______________

(1) Excludes an aggregate of 513,606 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 513,606 rentable square feet of retail space in our Manhattan office properties. Excludes the Empire State Building broadcasting licenses and observatory operations.

	Years Ended December 31,
	2018		2017		2016
Total Portfolio
Capital expenditures (1)	$	135,017	$	126,624	$	80,043

_______________

(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 December 31, 2018, we expect to incur additional costs relating to obligations under signed new leases of approximately $88.4 million for tenant improvements and leasing commissions. We intend to fund the tenant improvements and leasing commission costs through a combination of operating cash flow, cash on hand, short term investments and borrowings under the unsecured revolving credit and term loan 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, short term investments and borrowings under the unsecured revolving credit and term loan facility.

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Contractual Obligations

The following table summarizes the amounts due in connection with our contractual obligations described below for the years ending December 31, 2019 through 2023 and thereafter (amounts in thousands).

	Years Ended December 31,
	2019		2020		2021		2022		2023		Thereafter		Total
Mortgages and other debt(1)
Interest expense	$	73,893	$	67,227	$	67,030	$	64,001	$	59,685	$	318,426	$	650,262
Amortization	3,790		3,938		4,090		5,628		7,876		33,868		59,190
Principal repayment	250,000		—		—		265,000		—		1,355,422		1,870,422
Ground lease	1,518		1,518		1,518		1,518		1,518		68,298		75,888
Tenant improvement and leasing commission costs	68,578		19,823		34		—		—		—		88,435
Total (2)	$	397,779	$	92,506	$	72,672	$	336,147	$	69,079	$	1,776,014	$	2,744,197

_______________

(1) Assumes no extension options are exercised.

(2) Does not include various standing or renewal service contracts with vendors related to our property management.

Off-Balance Sheet Arrangements

As of December 31, 2018, 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 securityholders, 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 taxable 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, 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 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.

Distribution to Equity Holders

Distributions and dividends have been made to equity holders in 2016, 2017 and 2018 as follows (amounts in thousands):

Year ended December 31, 2016	114,954
Year ended December 31, 2017	126,963
Year ended December 31, 2018	126,539

Stock and Publicly Traded Operating Partnership Unit Repurchase Program

Our Board of Directors authorized the repurchase of up to $500 million of ESRT's Class A common stock and our Series ES, Series 250 and Series 60 operating partnership units through December 31, 2019.

Under the program, we may purchase ESRT's Class A common stock and our Series ES, Series 250 and Series 60 operating partnership units in accordance with applicable securities laws from time to time in the open market or in privately negotiated transactions. The timing, manner, price and amount of any repurchases will be determined by us at our discretion and will be subject to stock price, availability, trading volume and general market conditions. The authorization does not

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obligate us to acquire any particular amount of securities, and the program may be suspended or discontinued at our discretion without prior notice.

Cash Flows

Comparison of Year Ended December 31, 2018 to the Year Ended December 31, 2017

Net cash. Cash and cash equivalents and restricted cash were $270.8 million and $530.2 million as of December 31, 2018 and 2017, respectively. The decrease was primarily due to investments in short-term time deposits and capital

improvements and expenditures offset by net proceeds from the issuance of debt during the year ended December 31, 2018.

Operating activities. Net cash provided by operating activities increased by $84.8 million to $279.0 million for the year ended December 31, 2018 compared to $194.2 million for the year ended December 31, 2017 mainly attributable to payments of operating liabilities that occurred in 2017 which were absent in 2018. 2017 included a payment of an amount owed to the estate of Leona M. Helmsley, as required under our formation agreements, equal to the New York City transfer taxes which would have been payable by us in absence of the estate's exemption from such tax. This amount had been accrued as a liability at our formation in October 2013 and became payable upon the taxing authority's final approval of such exemption in September 2017, so the reduction in our liabilities matched the reduction in our cash.

Investing activities. Net cash used in investing activities increased by $420.0 million to $643.0 million for the year ended December 31, 2018 compared to $223.0 million for the year ended December 31, 2017 due to investments in short-term time deposits made during 2018.

Financing activities. Net cash provided by financing activities increased by $161.5 million to $104.6 million provided by financing activities for the year ended December 31, 2018 compared to $56.9 million used in financing activities for the year ended December 31, 2017. The net proceeds from issuance of debt was higher in 2018 compared to 2017.

Comparison of Year Ended December 31, 2017 to the Year Ended December 31, 2016

Net cash. Cash and cash equivalents and restricted cash were $530.2 million and $615.9 million as of December 31, 2017 and 2016, respectively. The decrease was primarily due to capital expenditures in 2017.

Operating activities. Net cash provided by operating activities decreased by $20.6 million to $194.2 million for the year ended December 31, 2017 compared to $214.8 million for the year ended December 31, 2016 primarily due to the payment of an amount owed to the estate of Leona M. Helmsley, as required under our formation agreements, equal to the New York City transfer taxes which would have been payable by us in absence of the estate's exemption from such tax. This amount had been accrued as a liability at our formation in October 2013 and became payable upon the taxing authority's final approval of such exemption in September 2017, so the reduction in our liabilities matched the reduction in our cash.

Investing activities. Net cash used in investing activities increased by $40.6 million to $223.0 million for the year ended December 31, 2017 compared to $182.4 million for the year ended December 31, 2016. The increase was primarily due to higher expenditures related to the Observatory capital project.

Financing activities. Net cash used in financing activities decreased by $527.8 million. In 2017 net cash used by financing was $56.9 million compared to 2016 net cash provided by financing of $470.9 million. The decrease related to the issuance of common stock to QIA in 2016.

Net Operating Income

Our financial reports include a discussion of property net operating income, or NOI. 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, loss on early extinguishment of debt and loss from derivative financial instruments, 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 NOI because it is specific to the particular financing capabilities and constraints of the owner. The cost of funds is eliminated because it is dependent on historical interest rates and other costs of capital as well as past decisions made by us regarding the appropriate mix of capital which may have changed or may change in the future. Depreciation and amortization expenses as well as gains or losses from the sale of operating real estate assets are eliminated because they may not accurately represent the actual change in value in our office or retail properties that result from use of the properties or changes in market conditions. While certain aspects of real property do decline in value over time in a manner that is reasonably captured by depreciation and amortization, the value

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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):

	Years Ended December 31,
	2018			2017			2016
Net income	$	117,253		$	118,253		$	107,250
Add:
General and administrative expenses	52,674			50,315			49,078
Depreciation and amortization	168,508			160,710			155,211
Interest expense	79,623			68,473			71,147
Loss on early extinguishment of debt	—			2,157			—
Loss from derivative financial instruments	—			289			—
Acquisition expenses	—			—			98
Income tax expense	4,642			6,673			6,146
Less:
Interest income	(10,661		)	(2,942		)	(647		)
Third-party management and other fees	(1,440		)	(1,400		)	(1,766		)
Net operating income	$	410,599		$	402,528		$	386,517
Other Net Operating Income Data
Straight line rental revenue	$	22,107		$	26,544		$	30,147
Net increase in rental revenue from the amortization of above and below-market lease assets and liabilities	$	6,120		$	5,721		$	8,794
Amortization of acquired below-market ground leases	$	7,831		$	7,831		$	7,831

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 writedowns of investments in depreciable real estate and investments in in-substance real estate investments, gains or losses from debt restructurings and sales of depreciable operating properties, plus real estate-related depreciation and amortization (excluding amortization of deferred financing costs), less distributions to non-controlling interests and gains/losses from discontinued operations and after adjustments for

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

Modified Funds From Operations ("Modified FFO")

Modified FFO adds back an adjustment for any above or below-market ground lease amortization to traditionally defined FFO. We consider this a useful supplemental measure in evaluating our operating performance due to the non-cash accounting treatment under GAAP, which stems from the third quarter 2014 acquisition of two option properties following our formation transactions 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 traditionally defined FFO the following items: acquisition expenses, severance expenses, retirement equity compensation expenses, private perpetual preferred exchange offering expenses, deferred tax asset write-off, loss on early extinguishment of debt, acquisition expenses, gain on settlement of lawsuit related to the Observatory, net of income taxes, ground lease amortization, 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 items associated with its IPO and formation transactions and other 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.

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

	Years Ended December 31,
	2018			2017			2016
Net income	$	117,253		$	118,253		$	107,250
Private perpetual preferred unit distributions	(936		)	(936		)	(936		)
Real estate depreciation and amortization	166,292			159,174			154,205
Funds from operations attributable to common stockholders and non-controlled interests	282,609			276,491			260,519
Amortization of below-market ground leases	7,831			7,831			7,831
Modified funds from operations attributable to common stockholders and non-controlled interests	290,440			284,322			268,350
Deferred tax asset write-off	—			446			—
Loss on early extinguishment of debt	—			2,157			552
Acquisition expenses	—			—			98
Core funds from operations attributable to common stockholders and non-controlled interests	$	290,440		$	286,925		$	269,000
Weighted average Operating Partnership units
Basic	297,258			296,455			276,848
Diluted	297,259			298,049			277,568

Factors That May Influence Future Results of Operations

Rental Revenue

We derive revenues primarily from rents, rent escalations, expense reimbursements and other income received from tenants under existing leases at each of our properties. “Escalations and expense reimbursements” consist of payments made by tenants to us under contractual lease obligations to reimburse a portion of the property operating expenses and real estate taxes incurred at each property.

We believe that the average rental rates for in-place leases at our properties are generally below the current market rates, although individual leases at particular properties presently may be leased above, at or below the current market rates within its particular submarket.

The amount of net rental income and reimbursements that we receive depends principally on our ability to lease currently available space, re-lease space to new tenants upon the scheduled or unscheduled termination of leases or renew expiring leases and to maintain or increase our rental rates. Factors that could affect our rental incomes include, but are not limited to: local, regional or national economic conditions; an oversupply of, or a reduction in demand for, office or retail space; changes in market rental rates; our ability to provide adequate services and maintenance at our properties; and fluctuations in interest rates, all of which could adversely affect our rental income in future periods. Future economic or regional downturns affecting our submarkets, or downturns in our tenants’ industries, could impair our ability to lease vacant space and renew or re-lease space as well as the ability of our tenants to fulfill their lease commitments, and could adversely affect our ability to maintain or increase the occupancy at our properties.

Tenant Credit Risk

The economic condition of our tenants may also deteriorate, which could negatively impact their ability to fulfill their lease commitments and in turn adversely affect our ability to maintain or increase the occupancy level and/or rental rates of our properties. Potential tenants may look to consolidate, reduce overhead and preserve operating capital and may also defer strategic decisions, including entering into new, long-term leases at properties.

Leasing

We signed 1.0 million, 1.3 million, and 1.0 million rentable square feet of new leases, expansions and lease renewals, for the years ended December 31, 2018, 2017, and 2016, respectively.

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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 December 31, 2018, there were approximately 0.8 million rentable square feet of space in our portfolio available to lease (excluding leases signed but not yet commenced) representing 8.2% of the net rentable square footage of the properties in our portfolio. In addition, leases representing 7.2% and 8.3% of net rentable square footage of the properties in our portfolio will expire in 2019 and in 2020, respectively. These leases are expected to represent approximately 7.1% and 8.7%, respectively, of our annualized rent for such periods. Our revenues and results of operations can be impacted by expiring leases that are not renewed or re-leased or that are renewed or re-leased at base rental rates equal to, above or below the current average base rental rates. Further, our revenues and results of operations can also be affected by the costs we incur to re-lease available space, including payment of leasing commissions, redevelopments and build-to-suit remodeling that may not be borne by the tenant.

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

Market Conditions

The properties in our portfolio are located in Manhattan and the greater New York metropolitan area, which includes Fairfield County, Connecticut and Westchester County, New York. Positive or negative changes in conditions in these markets, such as business hirings or layoffs or downsizing, industry growth or slowdowns, relocations of businesses, increases or decreases in real estate and other taxes, costs of complying with governmental regulations or changed regulation, can impact our overall performance.

Observatory and Broadcasting Operations

For the year ended December 31, 2018, the Empire State Building Observatory hosted 3,805,000 visitors, compared to 3,940,000 visitors for the same period in 2017, a decrease of 3.4%. Observatory revenue for the year ended December 31, 2018 was $131.2 million, a 3.2% increase from $127.1 million for the year ended December 31, 2017. The 102nd floor Observatory was closed during the first quarter 2018 for replacement of original elevator machinery with a new, higher speed glass elevator. In the year ended December 31, 2018, there were 56 bad weather days, with more of those days falling in peak visitor periods, compared to 61 bad weather days, with fewer of those days falling in peak visitor periods in the year ended December 31, 2017.

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

We license the use of the Empire State Building mast to third party television and radio broadcasters and providers of data communications.  We also lease space in the upper floors of the building to such licensees to house their transmission equipment and related facilities. During the year ended December 31, 2018, we derived $19.5 million of revenue and $2.9 million of expense reimbursements from the Empire State Building’s broadcasting licenses and related leases. In 2019 and 2020, licenses and related leases totaling $0.3 million and $1.0 million, respectively, are expected to expire.

Operating Expenses

Our operating expenses generally consist of depreciation and amortization, real estate taxes, ground lease expenses, repairs and maintenance, security, utilities, property-related payroll, insurance and bad debt expense. Factors that may affect our ability to control these operating costs include: increases in insurance premiums, tax rates, the cost of periodic repair, redevelopment costs and the cost of re-leasing space, the cost of compliance with governmental regulation, including zoning

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and tax laws, the potential for liability under applicable laws and interest rate levels. If our operating costs increase as a result of any of the foregoing factors, our future cash flow and results of operations may be adversely affected.

The expenses of owning and operating a property are not necessarily reduced when circumstances, such as market factors and competition, cause a reduction in income from the property. If revenues drop, we may not be able to reduce our expenses accordingly. Costs associated with real estate investments, such as real estate taxes and maintenance generally, will not be materially reduced even if a property is not fully occupied or other circumstances cause our revenues to decrease. As a result, if revenues decrease in the future, static operating costs may adversely affect our future cash flow and results of operations. If similar economic conditions exist in the future, we may experience future losses.

Cost of Funds and Interest Rates

As of December 31, 2018, we had no variable rate debt outstanding as the LIBOR rate on our unsecured term loan facility of $265.0 million was fixed at 2.1485% under a variable to fixed interest rate swap agreement. Our variable rate debt may increase to the extent we use available borrowing capacity from our unsecured credit facility to fund capital improvements.

Competition

The leasing of real estate is highly competitive in Manhattan and the greater New York metropolitan market in which we operate. We compete with numerous acquirers, developers, owners and operators of commercial real estate, many of which own or may seek to acquire or develop properties similar to ours in the same markets in which our properties are located. The principal means of competition are rent charged, location, services provided and the nature and condition of the facility to be leased. In addition, we face competition from other real estate companies including other REITs, private real estate funds, domestic and foreign financial institutions, life insurance companies, pension trusts, partnerships, individual investors and others that may have greater financial resources or access to capital than we do or that are willing to acquire properties in transactions which are more highly leveraged or are less attractive from a financial viewpoint than we are willing to pursue. In addition, competition from new and existing observatories and/or broadcasting operations could have a negative impact on revenues from our observatory and/or broadcasting operations. Adverse impacts on domestic travel and changes in foreign currency exchange rates may also decrease demand in the future, which could have a material adverse effect on our results of operations. If our competitors offer space at rental rates below current market rates, below the rental rates we currently charge our tenants, in better locations within our markets or in higher quality facilities, we may lose potential tenants and may be pressured to reduce our rental rates below those we currently charge in order to retain tenants when our tenants’ leases expire.

Critical Accounting Estimates

Basis of Presentation and Principles of Consolidation

The accompanying consolidated financial statements have been prepared in conformity with GAAP and with the rules and regulations of the SEC represent our assets and liabilities and operating results. The consolidated financial statements include our accounts and our wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation. For purposes of comparison, certain items shown in the 2016 and 2017 consolidated financial statements have been reclassified to conform to the presentation used for 2018.

    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 December 31, 2018 and 2017.

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

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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 consolidated balance sheets and in the consolidated statements of income by requiring earnings and other comprehensive income to be attributed to controlling and non-controlling interests.

Goodwill

Goodwill is tested annually for impairment and is tested for impairment more frequently if events and circumstances indicate that the asset might be impaired. An impairment loss is recognized to the extent that the carrying amount, including goodwill, exceeds the reporting unit’s fair value and the implied fair value of goodwill is less than the carrying amount of that goodwill. Non-amortizing intangible assets, such as trade names and trademarks, are subject to an annual impairment test based on fair value and amortizing intangible assets are tested whenever events or changes in circumstances indicate that the carrying amount may not be recoverable.

We performed an annual review of goodwill for impairment and concluded there was no impairment of goodwill. Our methodology to review goodwill impairment, which includes a significant amount of judgment and estimates, provides a reasonable basis to determine whether impairment has occurred. However, many of the factors employed in determining whether or not goodwill is impaired are outside of our control and it is reasonably likely that assumptions and estimates will change in future periods.

Income Taxes

We are generally not subject to federal and state income taxes as our taxable income or loss is reportable by our partners. Accordingly, no provision has been made for federal and state income taxes. ESRT elected, together with ESRT Observatory TRS, L.L.C., our subsidiary which holds our observatory operations, to treat ESRT Observatory TRS, L.L.C. as a TRS, and ESRT has elected, together with ESRT Holdings TRS, L.L.C., our subsidiary that holds our third party management, construction (through cessation of our construction business in the first quarter of 2015), restaurant, cafeteria, health clubs and certain cleaning operations, to treat ESRT Holdings TRS, L.L.C. as a TRS. TRS's may participate in non-real estate activities and/or perform non-customary services for tenants and their operations are generally subject to regular corporate income taxes. Each of our TRS's account for their income taxes in accordance with GAAP, which includes an estimate of the amount of taxes payable or refundable for the current year and deferred tax liabilities and assets for the future tax consequences of events that have been recognized in our financial statements or tax returns. The calculation of the TRS's tax provisions may require interpreting tax laws and regulations and could result in the use of judgments or estimates which could cause its recorded tax liability to differ from the actual amount due. Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. The TRS's periodically assess the realizability of deferred tax assets and the adequacy of deferred tax liabilities, including the results of local, state, or federal tax audits or estimates and judgments used.

We apply provisions for measuring and recognizing tax benefits associated with uncertain income tax positions. Penalties and interest, if incurred, would be recorded as a component of income tax expense. As of December 31, 2018 and 2017, we do not have a liability for uncertain tax positions. As of December 31, 2018, the tax years ended December 31, 2015 through December 31, 2018 remain open for an audit by the Internal Revenue Service, state or local authorities.

Share-Based Compensation

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. The determination of fair value of these awards is subjective and involves significant estimates and assumptions including expected volatility of ESRT stock, expected dividend yield, expected term, and assumptions of whether these awards will achieve parity with other operating partnership units or achieve performance thresholds. We believe that the assumptions and estimates utilized are appropriate based on the information available to management at the time of grant.

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, repositioning and disposition of our real estate assets. Our observatory segment operates the 86th and 102nd floor observatories at the Empire State Building. These two lines of

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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 different 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.

Accounting Standards Update

Reference is made to Note 2 in the accompanying consolidated financial statements for information about recently issued and recently adopted accounting standards.

ITEM 7A. 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 December 31, 2018, we had no variable rate debt as the LIBOR rate on our unsecured term loan facility of $265.0 million was fixed at 2.1485% under a variable to fixed interest rate swap agreement.

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

As of December 31, 2018, we had interest rate LIBOR swap agreements with an aggregate notional value of $515.0 million, which fix LIBOR interest rates between 2.1485% and 2.9580% and mature between August 24, 2022 and July 1, 2026. All interest rate swaps have been designated as cash flow hedges and are deemed highly effective with a fair value of $2.5 million which is included in prepaid expenses and other assets and ($5.2 million) which is included in accounts payable and accrued expenses on the consolidated balance sheet as of December 31, 2018.

As of December 31, 2018, the weighted average interest rate on the $1.9 billion of fixed-rate indebtedness outstanding was 3.84% per annum, each with maturities at various dates through March 22, 2033.

As of December 31, 2018, the fair value of our outstanding debt was approximately $1.9 billion which was approximately $10.2 million less than the historical book value as of such date. Interest risk amounts were determined by considering the impact of hypothetical interest rates on our financial instruments. These analyses do not consider the effect of any change in overall economic activity that could occur in that environment. Further, in the event of a change of that magnitude, we may take actions to further mitigate our exposure to the change. However, due to the uncertainty of the specific actions that would be taken and their possible effects, these analyses assume no changes in our financial structure.

Our exposures to market risk have not changed materially since December 31, 2018.

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

The financial statements beginning on Page F-1 of this Annual Report on Form 10-K are incorporated herein by reference.

ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

None.

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ITEM 9A. 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 December 31, 2018, 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.     

Changes in Internal Control over Financial Reporting

No significant 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.

(a) Management's Report on Internal Control over Financial Reporting

Management of Empire State Realty OP, L.P. is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in the Securities Exchange Act of 1934 Rule 13(a)-15(f). Under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, we conducted an evaluation of the effectiveness of our internal control over financial reporting as of December 31, 2018 as required by the Securities Exchange Act of 1934 Rule 13(a)-15(c). In making this assessment, we used the criteria set forth in the framework in Internal Control–Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (the "COSO criteria"). Based on our evaluation under the COSO criteria, our management concluded that our internal control over financial reporting was effective as of December 31, 2018 to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external reporting purposes in accordance with U.S. generally accepted accounting principles.

Ernst & Young LLP, an independent registered public accounting firm that audited our Financial Statements included in this Annual Report, has issued an attestation report on our internal control over financial reporting as of December 31, 2018, which appears in paragraph (b) of this Item 9A.

(b) Attestation report of the independent registered public accounting firm

Report of Independent Registered Public Accounting Firm

To the Partners of Empire State Realty OP, L.P.

Opinion on Internal Control over Financial Reporting

We have audited Empire State Realty OP, L.P.’s internal control over financial reporting as of December 31, 2018, based on criteria established in Internal Control- Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework)(the COSO criteria). In our opinion, Empire State Realty OP, L.P (the Company) maintained, in all material respects, effective internal control over financial reporting as of December 31, 2018, based onthe COSO criteria.

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We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the 2018 consolidated financial statements of the Company and our report dated February 28, 2019 expressed an unqualified opinion thereon.

Basis for Opinion

The Operating Partnership’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management's Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Operating Partnership’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Operating Partnership in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects.

Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control Over Financial Reporting

A company’s internal control over financial reporting is a process designed 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. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ Ernst & Young LLP

New York, New York

February 28, 2019

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ITEM 9B. OTHER INFORMATION

None.

PART III

ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

We are managed by Empire State Realty Trust, Inc. in its capacity as our sole general partner. The information required by Item 10 will be set forth in Empire State Realty Trust, Inc.'s definitive proxy statement for its 2018 Annual Meeting of Stockholders (which is scheduled to be held on May 16, 2019), to be filed pursuant to Regulation 14A under the Securities and Exchange Act of 1934, as amended, or the ESRT Proxy Statement, and is incorporated herein by reference.

ITEM 11. EXECUTIVE COMPENSATION

We are managed by Empire State Realty Trust, Inc. in its capacity as our sole general partner. The information required by Item 11 will be set forth in the ESRT Proxy Statement and is incorporated herein by reference.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

The information required by Item 12 will be set forth in the ESRT Proxy Statement and is incorporated herein by reference.

The information under Item 5 of this Form 10-K under the heading “Securities Authorized For Issuance Under Equity Compensation Plans” is incorporated herein by reference.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

The information required by Item 13 will be set forth in the ESRT Proxy Statement and is incorporated herein by reference.

ITEM 14. PRINCIPAL ACCOUNTING FEES AND SERVICES

The information required by Item 14 will be set forth in the ESRT Proxy Statement and is incorporated herein by reference.

PART IV

ITEM 15. EXHIBITS, FINANCIAL STATEMENTS AND SCHEDULES

(a) The following documents are filed as part of this report:

1. The consolidated financial statements are set forth in Item 8 of this Annual Report on Form 10-K.

2. The following financial statement schedules should be read in conjunction with the financial statements included in Item 8 of this Annual Report on Form 10-K.

Schedule II-Valuation and Qualifying Accounts for the years ended December 31, 2018, 2017 and 2016 on page F-40.

Schedule III-Real Estate and Accumulated Depreciation as of December 31, 2018 on page F-41.

Schedules other than those listed are omitted as they are not applicable or the required or equivalent information has been included in the financial statements or notes thereto.

(b) The exhibits required by Item 601 of Regulation S-K (§229.601 of this chapter) are listed below:

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Exhibit Index

Exhibit No.	Description
3.1	Articles of Amendment and Restatement of Empire State Realty Trust, Inc., incorporated by reference to Exhibit 3.1 to Amendment No. 8 to Empire State Realty Trust, Inc.'s Form S-11 (Registration No. 333-179485), filed with the SEC on September 27, 2013.
3.2	Second Amended and Restated Bylaws of Empire State Realty Trust, Inc., incorporated by reference to Exhibit 3.1 to the Registrant’s Form 8-K filed with the SEC on March 7, 2018.
4.1	Specimen Class A Common Stock Certificate of Empire State Realty Trust, Inc., incorporated by reference to Exhibit 4.1 to Amendment No. 3 to Empire State Realty Trust, Inc.'s Form S-11 (Registration No. 333-179485), filed with the SEC on November 2, 2012.
4.2	Specimen Class B Common Stock Certificate of Empire State Realty Trust, Inc., incorporated by reference to Exhibit 4.2 to Amendment No. 3 to the Registrant's Form S-11 (Registration No. 333-179485), filed with the SEC on November 2, 2012.
4.3	Indenture, dated August 12, 2014, by and among Empire State Realty OP, L.P., as issuer, Empire State Realty Trust, Inc., and Wilmington Trust, National Association, as trustee, incorporated by reference to Exhibit 4.1 to the Registrant’s Form 8-K filed with the SEC on August 12, 2014.
4.4	Form of Global Note representing Empire State Realty OP, L.P.’s 2.625% Exchangeable Senior Notes due 2019 (included in Exhibit 4.3).
10.1	Contribution Agreement among Empire Realty Trust, Inc., Empire Realty Trust, L.P. and certain members of the Malkin Group listed on the signature pages thereto, dated November 28, 2011, incorporated by reference to Exhibit 10.8 to Empire State Realty Trust, Inc.'s Form S-11 (Registration No. 333-179485), filed with the SEC on February 13, 2012.
10.2	Amended and Restated Contribution Agreement among Empire Realty Trust, Inc., Empire Realty Trust, L.P. and certain entities affiliated with the Helmsley estate listed on the signature pages thereto, dated July 2, 2012, incorporated by reference to Exhibit 10.11 to Amendment No. 7 to Empire State Realty Trust, Inc.'s Form S-11 (Registration No. 333-179485), filed with the SEC on September 19, 2013.
10.3	Form of Contribution Agreement among Empire Realty Trust, Inc., Empire Realty Trust, L.P. and each of the private existing entities that contributed properties in the consolidation, incorporated by reference to Exhibit 10.10 to Empire State Realty Trust, Inc.'s Form S-11 (Registration No. 333-179485), filed with the SEC on February 13, 2012.
10.4	Form of Contribution Agreement among Empire State Realty Trust, Inc., Empire Realty OP, L.P. and each of the public existing entities that contributed properties in the consolidation, incorporated by reference to Exhibit 10.11 to Empire State Realty Trust, Inc.'s Form S-11 (Registration No. 333-179485), filed with the SEC on February 13, 2012.
10.5	Representation, Warranty and Indemnity Agreement among Empire Realty Trust, Inc., Empire Realty Trust, L.P., Anthony E. Malkin, Cynthia M. Blumenthal and Scott D. Malkin, dated November 28, 2011, incorporated by reference to Exhibit 10.13 to Empire State Realty Trust, Inc.'s Form S-11 (Registration No. 333-179485), filed with the SEC on February 13, 2012.
10.6	Form of Merger Agreement among Empire Realty Trust, Inc., Empire Realty Trust, L.P. and each of the predecessor management companies, incorporated by reference to Exhibit 10.12 to Empire State Realty Trust, Inc.'s Form S-11 (Registration No. 333-179485), filed with the SEC on February 13, 2012.
10.7+	First Amended and Restated Empire State Realty Trust, Inc. Empire State Realty OP, L.P. 2013 Equity Incentive Plan (as amended and restated as of April 4, 2016), incorporated by reference to Exhibit 10.10 to the Registrant's Form 10-Q filed with the SEC on May 5, 2016.
10.8+	Form of Restricted Stock Agreement (Performance-Based)), incorporated by reference to Exhibit 10.11 to the Registrant’s Form 10-K, filed with the SEC on March 24, 2014.
10.9+	Form of Restricted Stock Agreement (Time-Based), incorporated by reference to Exhibit 10.12 to the Registrant’s Form 10-K, filed with the SEC on March 24, 2014.
10.10+	Form of LTIP Agreement (Performance-Based), incorporated by reference to Exhibit 10.13 to the Registrant’s Form 10-K, filed with the SEC on March 24, 2014.
10.11+	Form of LTIP Agreement (Time-Based), incorporated by reference to Exhibit 10.14 to the Registrant’s Form 10-K, filed with the SEC on March 24, 2014.
10.12	Amended and Restated Agreement of Limited Partnership of Empire State Realty OP, L.P., dated October 1, 2013, incorporated by reference to Exhibit 10.1 to Empire State Realty Trust, Inc.'s Form 10-Q filed with the SEC on November 12, 2013.

73

10.13	Amendment No. 1 to the First Amended and Restated Agreement of Limited Partnership of Empire State Realty OP, L.P., dated August 26, 2014, incorporated by reference to Exhibit 10.1 to the Registrant’s Form 8-K filed with the SEC on August 26, 2014.
10.14	Registration Rights Agreement among Empire State Realty Trust, Inc. and the persons named therein, dated October 7, 2013, incorporated by reference to Exhibit 10.2 to Empire State Realty Trust, Inc.'s Form 10-Q filed with the SEC on November 12, 2013.
10.15	Tax Protection Agreement among Empire State Realty Trust, Inc., Empire State Realty OP, L.P., and the parties named therein, dated October 7, 2013, incorporated by reference to Exhibit 10.3 to Empire State Realty Trust, Inc.'s Form 10-Q filed with the SEC on November 12, 2013.
10.16	Indemnification Agreement among Empire State Realty Trust, Inc. and Peter L. Malkin, dated October 7, 2013, incorporated by reference to Exhibit 10.4 to Empire State Realty Trust, Inc.'s Form 10-Q filed with the SEC on November 12, 2013.
10.17	Indemnification Agreement among Empire State Realty Trust, Inc. and Anthony E. Malkin, dated October 7, 2013, incorporated by reference to Exhibit 10.5 to Empire State Realty Trust, Inc.'s Form 10-Q filed with the SEC on November 12, 2013.
10.18	Indemnification Agreement among Empire State Realty Trust, Inc. and David A. Karp, dated October 7, 2013, incorporated by reference to Exhibit 10.6 to Empire State Realty Trust, Inc.'s Form 10-Q filed with the SEC on November 12, 2013.
10.19	Indemnification Agreement among Empire State Realty Trust, Inc. and Thomas P. Durels, dated October 7, 2013, incorporated by reference to Exhibit 10.7 to Empire State Realty Trust, Inc.'s Form 10-Q filed with the SEC on November 12, 2013.
10.20	Indemnification Agreement among Empire State Realty Trust, Inc. and Thomas N. Keltner, Jr., dated October 7, 2013, incorporated by reference to Exhibit 10.8 to Empire State Realty Trust, Inc.'s Form 10-Q filed with the SEC on November 12, 2013.
10.21	Indemnification Agreement among Empire State Realty Trust, Inc. and John B. Kessler, dated February 1, 2015, incorporated by reference to Exhibit 10.24 to Empire State Realty Trust's Form 10-K filed with the SEC on February 27, 2015.
10.22	Form of Empire State Realty Trust, Inc. Independent Director Indemnification Agreement, incorporated by reference to Exhibit 10.22 to Empire State Realty Trust's Form 10-K filed with the SEC on February 28, 2018.
10.29+	Amended and Restated Employment Agreement between Empire State Realty Trust, Inc. and Anthony E. Malkin, dated April 5, 2016, incorporated by reference to Exhibit 10.32 to the Registrant's Form 10-Q filed with the SEC on May 5, 2016.
10.30+	Amended and Restated Change in Control Severance Agreement between Empire State Realty Trust, Inc. and David A. Karp, dated April 5, 2016, incorporated by reference to Exhibit 10.33 to the Registrant's Form 10-Q filed with the SEC on May 5, 2016.
10.31+	Amended and Restated Change in Control Severance Agreement between Empire State Realty Trust, Inc. and Thomas N. Keltner, Jr., dated April 5, 2016, incorporated by reference to Exhibit 10.34 to the Registrant's Form 10-Q filed with the SEC on May 5, 2016.
10.32+	Amended and Restated Change in Control Severance Agreement between Empire State Realty Trust, Inc. and Thomas P. Durels, dated April 5, 2016, incorporated by reference to Exhibit 10.35 to the Registrant's Form 10-Q filed with the SEC on May 5, 2016.
10.33+	Change in Control Severance Agreement between Empire State Realty Trust, Inc. and John B. Kessler, dated February 1, 2015, incorporated by reference to Exhibit 10.36 to the Registrant's Form 10-K filed with the SEC on February 27, 2015.
10.36	Note Purchase Agreement, dated March 27, 2015, among Empire State Realty OP, L.P., Empire State Realty Trust, Inc. and the purchasers named therein, incorporated by reference to Exhibit 10.1 to the Registrant's Form 8-K filed with the SEC on March 30, 2015.
10.37	Registration Rights Agreement among Empire State Realty Trust, Inc. and the persons named therein, dated July 15, 2014, incorporated by reference to Exhibit 10.4 to the Registrant's Form 8-K filed with the SEC on July 21, 2014.
10.38	Registration Rights Agreement, dated August 12, 2014, by and among Empire State Realty OP, L.P., Empire State Realty Trust, Inc. and Goldman, Sachs & Co., incorporated by reference to Exhibit 10.1 to the Registrant’s Form 8-K filed with the SEC on August 12, 2014.
10.39	Form of Asset and Property Management Agreement, incorporated by reference to Exhibit 10.18 to Amendment No. 6 to Empire State Realty Trust, Inc.'s Form S-11 (Registration No. 333-179485), filed with the SEC on September 6, 2013.
10.40	Form of Services Agreement, incorporated by reference to Exhibit 10.19 to Amendment No. 6 to Empire State Realty Trust, Inc.'s Form S-11 (Registration No. 333-179485), filed with the SEC on September 6, 2013.

74

10.41	Amended and Restated Credit Agreement dated August 29, 2017 among Empire State Realty OP, L.P., as borrower, Empire State Realty Trust, Inc., Bank of America, N.A., as administrative agent, and the lenders and L/C issuers party hereto, Wells Fargo Bank, National Association and Capital One, National Association, as co-syndication agents, Merrill Lynch, Pierce, Fenner & Smith Incorporated and Wells Fargo Securities, LLC, as joint bookrunners and the other lenders party thereto, incorporated by reference to Exhibit 10.1 to the Registrant's Form 8-K filed with SEC on September 05, 2017.
10.42	Note Purchase Agreement, dated December 13, 2017, among Empire State Realty OP, L.P., Empire State Realty Trust, Inc. and the purchasers named therein, incorporated by reference to Exhibit 10.1 to the Registrant's Form 8-K filed with the SEC on December 14, 2017.
10.43+	First Amendment, dated as of October 5, 2018, to the Amended and Restated Employment Agreement between Empire State Realty Trust, Inc. and Anthony E. Malkin, dated April 5, 2016, incorporated by reference to Exhibit 10.45 to the Registrant's Form 10-Q filed with SEC on November 6, 2018.
21.1*	Subsidiaries of Registrant
23.1*	Consent of Ernst & Young LLP
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.
+ Indicates management contract or compensatory plan or arrangement required to be filed or incorporated by reference as an exhibit to this Form 10-K pursuant to Item 15(b) of Form 10-K.

ITEM 16. FORM 10-K SUMMARY

None.

75

SIGNATURES

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

EMPIRE STATE REALTY OP, L.P.

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

Date: February 28, 2019                             By:/s/ Anthony E. Malkin

Chairman and Chief Executive Officer

Date: February 28, 2019                             By:/s/ David A. Karp

Executive Vice President and Chief Financial Officer

Date: February 28, 2019                             By:/s/ Andrew J. Prentice

Senior Vice President,

Chief Accounting Officer and Treasurer

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, this report has been signed below by the following persons on behalf of Empire State Realty Trust, Inc., as general partner of the registrant and in the capacities and on the dates indicated.

Signature	Title	Date
/s/ Anthony E. Malkin	Chairman of the Board of Directors and Chief Executive Officer	February 28, 2019
Anthony E. Malkin
	(Principal Executive Officer)
/s/ David A. Karp	Executive Vice President and Chief Financial Officer	February 28, 2019
David A. Karp
	(Principal Financial Officer)
/s/ Andrew J. Prentice	Senior Vice President, Chief Accounting Officer and Treasurer	February 28, 2019
Andrew J. Prentice	(Principal Accounting Officer)
/s/ William H. Berkman	Director	February 28, 2019
William H. Berkman
/s/ Leslie D. Biddle	Director	February 28, 2019
Leslie D. Biddle
/s/ Thomas J. DeRosa	Director	February 28, 2019
Thomas J. DeRosa
/s/ Steven J. Gilbert	Lead Independent Director	February 28, 2019
Steven J. Gilbert
/s/ S. Michael Giliberto	Director	February 28, 2019
S. Michael Giliberto
/s/ James D. Robinson IV	Director	February 28, 2019
James D. Robinson IV

76

EMPIRE STATE REALTY OP, L.P.

INDEX TO FINANCIAL STATEMENTS

	PAGE
Report of Independent Registered Public Accounting Firm	F-1
Consolidated Balance Sheets as of December 31, 2018 and 2017	F-2
Consolidated Statements of Income for the years ended December 31, 2018, 2017 and 2016	F-3
Consolidated Statements of Comprehensive Income for the years ended December 31, 2018, 2017 and 2016	F-4
Consolidated Statements of Capital for the years ended December 31, 2018, 2017 and 2016	F-5
Consolidated Statements of Cash Flows for the years ended December 31, 2018, 2017 and 2016	F-6
Notes to Consolidated Financial Statements	F-8
Financial Statement Schedules:
Schedule II - Valuation and Qualifying Accounts	F-40
Schedule III - Real Estate and Accumulated Depreciation	F-41

77

Report of Independent Registered Public Accounting Firm

To the Partners of Empire State Realty OP, L.P.

Opinion on the Financial Statements:

We have audited the accompanying consolidated balance sheets of Empire State Realty OP, L.P. (the Operating Partnership) as of December 31, 2018 and 2017, the related consolidated statements of income, comprehensive income, capital and cash flows for each of the three years in the period ended December 31, 2018, and the related notes and financial statement schedules listed in the Index at Item 15(a) (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Operating Partnership at December 31, 2018 and 2017, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2018 in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Operating Partnership's internal control over financial reporting as of December 31, 2018, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework), and our report dated February 2-, 2019, expressed an unqualified opinion thereon.

Basis for Opinion:

These financial statements are the responsibility of the Operating Partnership’s management. Our responsibility is to express an opinion on the Operating Partnership’s financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Operating Partnership in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

/s/ Ernst & Young LLP

We have served as the Operating Partnership's auditor since 2010.

New York, New York

February 28, 2019

F-1

Empire State Realty OP, L.P.

Consolidated Balance Sheets

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

ASSETS	December 31, 2018			December 31, 2017
Commercial real estate properties, at cost:
Land	$	201,196		$	201,196
Development costs	7,987			7,986
Building and improvements	2,675,303			2,458,473
	2,884,486			2,667,655
Less: accumulated depreciation	(747,304		)	(656,900		)
Commercial real estate properties, net	2,137,182			2,010,755
Cash and cash equivalents	204,981			464,344
Restricted cash	65,832			65,853
Short-term investments	400,000			—
Tenant and other receivables, net of allowance of $488 and $1,422 in 2018 and 2017, respectively	29,437			28,329
Deferred rent receivables, net of allowance of $19 and $185 in 2018 and 2017, respectively	200,903			178,629
Prepaid expenses and other assets	64,345			61,028
Deferred costs, net	241,223			262,701
Acquired below market ground leases, net	360,398			368,229
Goodwill	491,479			491,479
Total assets	$	4,195,780		$	3,931,347
LIABILITIES AND CAPITAL
Liabilities:
Mortgage notes payable, net	$	608,567		$	717,164
Senior unsecured notes, net	1,046,219			707,895
Unsecured term loan facility, net	264,147			263,662
Unsecured revolving credit facility	—			—
Accounts payable and accrued expenses	130,676			110,849
Acquired below market leases, net	52,450			66,047
Deferred revenue and other liabilities	44,810			40,907
Tenants’ security deposits	57,802			47,086
Total liabilities	2,204,671			1,953,610
Commitments and contingencies
Capital:
Private perpetual preferred units, $16.62 per unit liquidation preference, 1,560,360 issued and outstanding in 2018 and 2017, respectively	8,004			8,004
Series PR operating partnership units:
ESRT partners' capital (3,033,261 and 3,004,095 general partner operating partnership units and 171,877,365 and 158,472,949 limited partner operating partnership units outstanding at December 31, 2018 and 2017, respectively)	1,238,482			1,168,282
Limited partners' interests (86,202,638 and 91,759,741 limited partner operating partnership units outstanding at December 31, 2018 and 2017, respectively)	725,108			778,279
Series ES operating partnership units (30,129,556 and 33,774,678 limited partner operating partnership units outstanding at December 31, 2018 and 2017, respectively)	14,399			17,132
Series 60 operating partnership units (8,019,509 and 8,987,931 limited partner operating partnership units outstanding at December 31, 2018 and 2017, respectively)	3,385			3,992
Series 250 operating partnership units (4,063,737 and 4,410,093 limited partner operating partnership units outstanding at December 31, 2018 and 2017, respectively)	1,731			2,048
Total capital	1,991,109			1,977,737
Total liabilities and capital	$	4,195,780		$	3,931,347

The accompanying notes are an integral part of these financial statements

F-2

Empire State Realty OP, L.P.

Consolidated Statements of Income

(amounts in thousands, except per unit amounts)

	For the Year Ended December 31,
	2018			2017			2016
Revenues:
Rental revenue	$	493,231		$	483,944		$	460,653
Tenant expense reimbursement	72,372			73,679			73,459
Observatory revenue	131,227			127,118			124,814
Lease termination fees	20,847			13,551			7,676
Third-party management and other fees	1,440			1,400			1,766
Other revenue and fees	12,394			9,834			8,985
Total revenues	731,511			709,526			677,353
Operating expenses:
Property operating expenses	167,379			163,531			153,850
Ground rent expenses	9,326			9,326			9,326
General and administrative expenses	52,674			50,315			49,078
Observatory expenses	32,767			30,275			29,833
Real estate taxes	110,000			102,466			96,061
Acquisition expenses	—			—			98
Depreciation and amortization	168,508			160,710			155,211
Total operating expenses	540,654			516,623			493,457
Total operating income	190,857			192,903			183,896
Other income (expense):
Interest income	10,661			2,942			647
Interest expense	(79,623		)	(68,473		)	(70,595		)
Loss on early extinguishment of debt	—			(2,157		)	(552		)
Loss from derivative financial instruments	—			(289		)	—
Income before income taxes	121,895			124,926			113,396
Income tax expense	(4,642		)	(6,673		)	(6,146		)
Net income	117,253			118,253			107,250
Private perpetual preferred unit distributions	(936		)	(936		)	(936		)
Net income attributable to common unitholders	$	116,317		$	117,317		$	106,314
Total weighted average units:
Basic	297,258			296,455			276,848
Diluted	297,259			298,049			277,568
Net income per unit:
Basic	$	0.39		$	0.39		$	0.38
Diluted	$	0.39		$	0.39		$	0.38

The accompanying notes are an integral part of these financial statements

F-3

Empire State Realty OP, L.P.

Consolidated Statements of Comprehensive Income

(amounts in thousands)

	For the Year Ended December 31,
	2018			2017			2016
Net income	$	117,253		$	118,253		$	107,250
Other comprehensive loss:
Unrealized loss on valuation of interest rate swap agreements	(2,721		)	(11,658		)	(3,054		)
Amount reclassified into interest expense	1,845			1,142			—
Other comprehensive loss	(876		)	(10,516		)	(3,054		)
Comprehensive income	$	116,377		$	107,737		$	104,196

The accompanying notes are an integral part of these financial statements

F-4

Empire State Realty OP, L.P.

Consolidated Statements of Capital

(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 Units			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	611,206			—		—			—		—			—		—			—		—			611,206
Conversion of operating partnership units and Class B shares to ESRT Partner's Capital	—	—			6,167	23,678			(2,657	)	(22,264		)	(2,534	)	(1,075		)	(617	)	(218		)	(359	)	(121		)	—
Equity compensation	—	—			40	357			1,869		9,372			—		—			—		—			—		—			9,729
Distributions	—	(936		)	—	(55,812		)	—		(37,621		)	—		(14,642		)	—		(3,985		)	—		(1,958		)	(114,954		)
Net income	—	936			—	51,456			—		34,977			—		14,140			—		3,827			—		1,914			107,250
Unrealized loss on valuation of interest rate swap agreements	—	—			—	(1,478		)	—		(1,005		)	—		(406		)	—		(110		)	—		(55		)	(3,054		)
Balance at December 31, 2016	1,560	8,004			155,841	1,154,136			93,075		793,360			35,728		20,091			9,701		4,880			4,747		2,392			1,982,863
Conversion of operating partnership units and Class B shares to ESRT Partner's Capital	—	—			5,615	23,435			(2,611	)	(21,997		)	(1,954	)	(978		)	(713	)	(310		)	(337	)	(150		)	—
Equity compensation	—	—			21	468			1,296		13,632			—		—			—		—			—		—			14,100
Distributions	—	(936		)	—	(66,789		)	—		(38,969		)	—		(14,477		)	—		(3,889		)	—		(1,903		)	(126,963		)
Net income	—	936			—	62,647			—		35,430			—		13,726			—		3,637			—		1,877			118,253
Other comprehensive income (loss)	—	—			—	(5,615		)	—		(3,177		)	—		(1,230		)	—		(326		)	—		(168		)	(10,516		)
Balance at December 31, 2017	1,560	8,004			161,477	1,168,282			91,760		778,279			33,774		17,132			8,988		3,992			4,410		2,048			1,977,737
Issuance of OP units, net of costs	—	—			284	4,749			—		—			—		—			—		—			—		—			4,749
Conversion of operating partnership units and Class B shares to ESRT Partner's Capital	—	—			13,127	70,779			(8,168	)	(68,386		)	(3,645	)	(1,809		)	(968	)	(423		)	(346	)	(161		)	—
Equity compensation	—	—			24	417			2,610		18,368			—		—			—		—			—		—			18,785
Distributions	—	(936		)	—	(70,854		)	—		(36,284		)	—		(13,161		)	—		(3,532		)	—		(1,772		)	(126,539		)
Net income	—	936			—	65,603			—		33,383			—		12,330			—		3,373			—		1,628			117,253
Other comprehensive income (loss)	—	—			—	(494		)	—		(252		)	—		(93		)	—		(25		)	—		(12		)	(876		)
Balance at December 31, 2018	1,560	$	8,004		174,912	$	1,238,482		86,202		$	725,108		30,129		$	14,399		8,020		$	3,385		4,064		$	1,731		$	1,991,109

The accompanying notes are an integral part of these financial statements

F-5

Empire State Realty OP, L.P.

Consolidated Statements of Cash Flows

(amounts in thousands)

	For the Year Ended December 31,
	2018			2017			2016
Cash Flows From Operating Activities
Net income	$	117,253		$	118,253		$	107,250
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	168,508			160,710			155,211
Amortization of non-cash items within interest expense	7,215			1,039			739
Amortization of acquired above and below-market leases, net	(6,120		)	(5,721		)	(8,795		)
Amortization of acquired below-market ground leases	7,831			7,831			7,831
Straight-lining of rental revenue	(22,107		)	(26,544		)	(30,147		)
Equity based compensation	18,785			14,100			9,729
Settlement of derivative contracts	—			(15,695		)	—
Loss on early extinguishment of debt	—			2,157			552
Increase (decrease) in cash flows due to changes in operating assets and liabilities:
Security deposits	10,717			(97		)	(1,707		)
Tenant and other receivables	(1,275		)	(5,787		)	(3,760		)
Deferred leasing costs	(26,899		)	(31,743		)	(22,622		)
Prepaid expenses and other assets	(781		)	(7,893		)	(3,289		)
Accounts payable and accrued expenses	1,993			(25,103		)	2,939
Deferred revenue and other liabilities	3,902			8,695			824
Net cash provided by operating activities	279,022			194,202			214,755
Cash Flows From Investing Activities
Short-term investments	(400,000		)	—			—
Additions to building and improvements	(243,022		)	(222,979		)	(181,923		)
Development costs	(1		)	(34		)	(453		)
Net cash used in investing activities	(643,023		)	(223,013		)	(182,376		)

The accompanying notes are an integral part of these financial statements

F-6

Empire State Realty OP, L.P.

Consolidated Statements of Cash Flows (continued)

(amounts in thousands)

	For the Year Ended December 31,
	2018			2017			2016
Cash Flows From Financing Activities
Proceeds from unsecured revolving credit facility	—			—			50,000
Repayments of unsecured revolving credit facility	—			—			(90,000		)
Proceeds from mortgage notes payable	160,000			315,000			50,000
Repayment of mortgage notes payable	(266,613		)	(346,615		)	(32,305		)
Proceeds from senior unsecured notes	335,000			115,000			—
Repayment of unsecured term loan	—			(265,000		)	—
Proceeds from unsecured revolving credit and term loan facility	—			265,000			—
Deferred financing costs	(1,980		)	(13,299		)	(3,006		)
Net proceeds from the issuance of operating partnership units	4,749			—			611,206
Private perpetual preferred unit distributions	(936		)	(936		)	(936		)
Distributions	(125,603		)	(126,027		)	(114,018		)
Net cash provided by (used in) financing activities	104,617			(56,877		)	470,941
Net (decrease) in cash and cash equivalents and restricted cash	(259,384		)	(85,688		)	503,320
Cash and cash equivalents and restricted cash—beginning of period	530,197			615,885			112,565
Cash and cash equivalents and restricted cash—end of period	$	270,813		$	530,197		$	615,885
Reconciliation of Cash and Cash Equivalents and Restricted Cash:
Cash and cash equivalents at beginning of period	$	464,344		$	554,371		$	46,685
Restricted cash at beginning of period	65,853			61,514			65,880
Cash and cash equivalents and restricted cash at beginning of period	$	530,197		$	615,885		$	112,565
Cash and cash equivalents at end of period	$	204,981		$	464,344		$	554,371
Restricted cash at end of period	65,832			65,853			61,514
Cash and cash equivalents and restricted cash at end of period	$	270,813		$	530,197		$	615,885
Supplemental disclosures of cash flow information:
Cash paid for interest	$	74,160		$	66,911		$	69,062
Interest capitalized	$	1,596		$	459		$	—
Cash paid for income taxes	$	4,847		$	5,783		$	6,238
Non-cash investing and financing activities:
Building and improvements included in accounts payable and accrued expenses	$	85,242		$	71,769		$	66,620
Write-off of fully depreciated assets	39,665			19,136			15,381
Derivative instruments at fair values included in prepaid expenses and other assets	2,536			—			614
Derivative instruments at fair values included in accounts payable and accrued expenses	5,243			436			5,591
Conversion of operating partnership units and Class B shares to Class A shares	70,779			23,435			23,678

The accompanying notes are an integral part of these financial statements

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Empire State Realty OP, L.P.

Notes to Consolidated Financial Statements

1. Description of Business and Organization

As used in these 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. Empire State Realty Trust, Inc.'s Class A common stock, par value $0.01 per share, is listed on the New York Stock Exchange under the symbol "ESRT." We were organized as a Delaware limited partnership on November 28, 2011.

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 December 31, 2018, ESRT owned approximately 57.7% of our operating partnership units.

As of December 31, 2018, 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 interest) encompassing approximately 9.4 million rentable square feet of office space. Nine of these properties are located in the midtown Manhattan market and encompass in the 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 513,606 rentable square feet of premier retail space on their ground floor and/or lower levels. Our remaining five office properties are located in Fairfield County, Connecticut and Westchester County, New York, encompassing in the aggregate approximately 1.8 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 December 31, 2018, our portfolio also included four standalone retail properties located in Manhattan and two standalone retail properties located in the city center of Westport, Connecticut, encompassing 205,748 rentable square feet in the aggregate.

We have two entities that elected, together with ESRT, to be treated as taxable REIT subsidiaries, or TRSs, of ESRT. The TRSs, through several wholly owned limited liability companies, conduct third-party services businesses, which include the Empire State Building Observatory, cleaning services, cafeteria, restaurant and health clubs, and asset and property management services.     

2. Summary of Significant Accounting Policies

Basis of Presentation and Principles of Consolidation

The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and with the rules and regulations of the Securities and Exchange Commission (the "SEC") represent our assets and liabilities and operating results. The consolidated financial statements include our accounts and our wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.

    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 December 31, 2018 and 2017.

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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 consolidated balance sheets and in the 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 consolidated financial statements in accordance with GAAP requires management to use estimates and assumptions that in certain circumstances affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities, and the reported revenues and expenses. Significant items subject to such estimates and assumptions include allocation of the purchase price of acquired real estate properties among tangible and intangible assets, determination of the useful life of real estate properties and other long-lived assets, valuation and impairment analysis of commercial real estate properties and other long-lived assets, estimate of tenant expense reimbursements, 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 notes, unsecured revolving credit and term loan 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.

Revenue Recognition

Rental Revenue

Rental revenue includes base rents that each tenant pays in accordance with the terms of its respective lease and is reported on a straight-line basis over the non-cancellable term of the lease which includes the effects of rent steps and rent abatements under the leases. In general, we commence rental revenue recognition when the tenant takes possession of the leased space or controls the physical use of the leased space and the leased space is substantially ready for its intended use. We account for all of our leases as operating leases. Deferred rent receivables, including free rental periods and leasing arrangements allowing for increased base rent payments, are accounted for in a manner that provides an even amount of fixed lease revenues over the respective non-cancellable lease terms. Differences between rental income recognized and amounts due under the respective lease agreements are recognized as an increase or decrease to deferred rent receivables.

In addition to base rent, our tenants also generally will pay their pro rata share of increases in real estate taxes and operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in building operating expenses, the tenant will pay additional rent based upon increases in an index such as the Consumer Price Index over the index value in effect during a base year, or contain fixed percentage increases over the base rent to cover escalations.

We will recognize rental revenue of acquired in-place above- and below-market leases at their fair values over the terms of the respective leases, including, for below-market leases, fixed option renewal periods, if any.

Lease termination fees are recognized when the fees are determinable, tenant vacancy has occurred, collectability is reasonably assured, we have no continuing obligation to provide services to such former tenants and the payment is not subject to any conditions that must be met or waived.

Observatory Revenue

Revenues from the sale of Observatory tickets are recognized upon admission or ticket expirations. Deferred revenue related to unused and unexpired tickets as of December 31, 2018 and 2017 was $4.1 million and $4.1 million, respectively, and is included in deferred revenue and other liabilities on the consolidated balance sheets.

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Gains on Sale of Real Estate

We record a gain on sale of real estate when title is conveyed to the buyer and we have no substantial economic involvement with the property. If the sales criteria for the full accrual method are not met, we defer some or all of the gain recognition and account for the continued operations of the property by applying the finance, leasing, profit sharing, deposit, installment or cost recovery methods, as appropriate, until the sales criteria are met.

Third-Party Management and Other Fees

We earn revenue arising from contractual agreements with related party entities for asset and property management services. This revenue is recognized as the related services are performed under the respective agreements in place.

Other Revenues and Fees

Other revenues and fees includes parking income, percentage rent, legal, tax and insurance settlements, demand response energy use earnings and sales from our restaurant at the Empire State Building.

Advertising and Marketing Costs

Advertising and marketing costs are expensed as incurred. The expense for the years ended December 31, 2018, 2017, and 2016 was $8.9 million, $7.6 million and $9.4 million, respectively, and is included within operating expenses in our consolidated statements of income.

Real Estate Properties and Related Intangible Assets

Land and buildings and improvements are recorded at cost less accumulated depreciation and amortization. The recorded cost includes cost of acquisitions, development and construction and tenant allowances and improvements. Expenditures for ordinary repairs and maintenance are charged to property operating expense as incurred. Significant replacements and betterments which improve or extend the life of the asset are capitalized. Tenant improvements which improve or extend the life of the asset are capitalized. If a tenant vacates its space prior to the contractual termination of its lease, the unamortized balance of any tenant improvements are written off if they are replaced or have no future value. For developed properties, direct and indirect costs that clearly relate to projects under development are capitalized. Costs include construction costs, professional services such as architectural and legal costs, capitalized interest and direct payroll costs. We begin capitalization when the project is probable. The assets relating to the project are stated at cost and are not depreciated. Once construction is completed and the assets are placed in service, the assets are reclassified to the appropriate asset class and depreciated in accordance with the useful lives as indicated below. Capitalization of interest ceases when the asset is ready for its intended use, which is generally near the date that a certificate of occupancy is obtained. Total capitalized interest for the years ended December 31, 2018 and 2017 was $1.6 million and $0.5 million, respectively. There was no capitalized interest for the year ended December 31, 2016.

Depreciation and amortization are computed using the straight-line method for financial reporting purposes. Buildings and improvements are depreciated over the shorter of 39 years, the useful life, or the remaining term of any leasehold interest. Tenant improvement costs, which are included in building and improvements in the consolidated balance sheets, are depreciated over the shorter of (i) the related remaining lease term or (ii) the life of the improvement. Corporate equipment, which is included in “Other assets,” is depreciated over three to seven years.

Acquisitions of properties are accounted for utilizing the acquisition method and accordingly the purchase cost is allocated to tangible and intangible assets and liabilities based on their fair values. The fair value of tangible assets acquired is determined by valuing the property as if it were vacant, applying methods similar to those used by independent appraisers of income-producing property. The resulting value is then allocated to land, buildings and improvements, and tenant improvements based on our determination of the fair value of these assets. The assumptions used in the allocation of fair values to assets acquired are based on our best estimates at the time of evaluation.

Fair value is assigned to above-market and below-market leases based on the difference between (a) the contractual amounts to be paid by the tenant based on the existing lease and (b) our estimate of current market lease rates for the corresponding in-place leases, over the remaining terms of the in-place leases. Capitalized above-market lease amounts are amortized as a decrease to rental revenue over the remaining terms of the respective leases. Capitalized below-market lease

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amounts are amortized as an increase to rental revenue over the remaining terms of the respective leases. If a tenant vacates its space prior to the contractual termination of the lease and no rental payments are being made on the lease, any unamortized balance of the related intangible will be written off.

The aggregate value of other acquired intangible assets consists of acquired ground leases and acquired in-place leases and tenant relationships. The fair value allocated to acquired in-place leases consists of a variety of components including, but not necessarily limited to: (a) the value associated with avoiding the cost of originating the acquired in-place leases (i.e. the market cost to execute a lease, including leasing commissions and legal fees, if any); (b) the value associated with lost revenue related to tenant reimbursable operating costs estimated to be incurred during the assumed lease-up period (i.e. real estate taxes, insurance and other operating expenses); (c) the value associated with lost rental revenue from existing leases during the assumed lease-up period; and (d) the value associated with any other inducements to secure a tenant lease.

We assess the potential for impairment of our long-lived assets, including real estate properties, annually or whenever events occur or a change in circumstances indicate that the recorded value might not be fully recoverable. We determine whether impairment in value has occurred by comparing the estimated future undiscounted cash flows expected from the use and eventual disposition of the asset to its carrying value. If the undiscounted cash flows do not exceed the carrying value, the real estate is adjusted to fair value and an impairment loss is recognized. Assets held for sale are recorded at the lower of cost or fair value less costs to sell. We do not believe that the value of any of our properties and intangible assets were impaired during the years ended December 31, 2018, 2017 and 2016.

Cash and Cash Equivalents

Cash and cash equivalents consist of cash on hand, government money markets, demand deposits with financial institutions and short-term liquid investments with original maturities of three months or less when purchased. Cash and cash equivalents held at major commercial banks may at times exceed the Federal Deposit Insurance Corporation limit. To date, we have not experienced any losses on our invested cash.

Restricted Cash

Restricted cash consists of amounts held for tenants in accordance with lease agreements such as security deposits and amounts held by lenders and/or escrow agents to provide for future real estate tax expenditures and insurance expenditures, tenant vacancy related costs and debt service obligations.

Short-term Investments

Short-term investments include time deposits with original maturities of greater than three months and remaining

maturities of less than one year.

Tenant and Other Receivables

Tenant and other receivables, other than deferred rent receivable, are generally expected to be collected within one year.

Allowance for Doubtful Accounts

We maintain an allowance against tenant and other receivables and deferred rents receivables for future potential tenant credit losses. The credit assessment is based on the estimated accrued rental revenue that is recoverable over the term of the respective lease. The computation of this allowance is based on the tenants’ payment history and current credit status. If our estimate of collectability differs from the cash received, then the timing and amount of our reported revenue could be impacted. Bad debt expense is included in operating expenses on our consolidated statements of income and includes the impact of changes in the allowance for doubtful accounts on our consolidated balance sheets.

Deferred Leasing Costs

Deferred leasing costs consist of fees and direct costs incurred to initiate and renew leases, are amortized on a straight-line basis over the related lease term and the expense is included in depreciation and amortization in our consolidated statements of income. Upon the early termination of a lease, unamortized deferred leasing costs are charged to expense.

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Deferred Financing Costs

Fees and costs incurred to obtain long-term financing have been deferred and are amortized as a component of interest expense in our consolidated statements of income over the life of the respective long-term financing on the straight-line method which approximates the effective interest method. Unamortized deferred financing costs are expensed when the associated debt is refinanced or repaid before maturity. Costs incurred in seeking debt, which do not close, are expensed in the period in which it is determined that the financing will not close.

Equity Method Investments

We account for investments under the equity method of accounting where we do not have control but have the ability to exercise significant influence. Under this method, investments are recorded at cost, and the investment accounts are adjusted for our share of the entities’ income or loss and for distributions and contributions. Equity income (loss) is allocated based on the portion of the ownership interest that is controlled by us. The agreements may designate different percentage allocations among investors for profits and losses; however, our recognition of the entity’s income or loss generally follows the entity’s distribution priorities, which may change upon the achievement of certain investment return thresholds.

To the extent that we contributed assets to an entity, our investment in the entity is recorded at cost basis in the assets that were contributed to the entity. Upon contributing assets to an entity, we make a judgment as to whether the economic substance of the transaction is a sale. If so, gain or loss is recognized on the portion of the asset to which the other partners in the entity obtain an interest.

To the extent that the carrying amount of these investments on our combined balance sheets is different than the basis reflected at the entity level, the basis difference would be amortized over the life of the related asset and included in our share of equity in net income of the entity.

On a periodic basis, we assess whether there are any indicators that the carrying value of our investments in entities may be impaired on an other than temporary basis. An investment is impaired only if management’s estimate of the fair value of the investment is less than the carrying value of the investment on an other than temporary basis. To the extent impairment has occurred, the loss shall be measured as the excess of the carrying value of the investment over the fair value of the investment.

As of December 31, 2018 and 2017, we had no equity method investments.

Goodwill

Goodwill is tested annually for impairment and is tested for impairment more frequently if events and circumstances indicate that the asset might be impaired. An impairment loss is recognized to the extent that the carrying amount, including goodwill, exceeds the reporting unit’s fair value and the implied fair value of goodwill is less than the carrying amount of that goodwill. Non-amortizing intangible assets, such as trade names and trademarks, are subject to an annual impairment test based on fair value and amortizing intangible assets are tested whenever events or changes in circumstances indicate that the carrying amount may not be recoverable.

Fair Value

Fair value is a market-based measurement, not an entity-specific measurement, and should be determined based on the assumptions that market participants would use in pricing the asset or liability. As a basis for considering market participant assumptions in fair value measurements, the Financial Accounting Standards Board ("FASB") guidance establishes a fair value hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity (observable inputs that are classified within levels one and two of the hierarchy) and the reporting entity's own assumptions about market participant assumptions (unobservable inputs classified within Level 3 of the hierarchy).

The methodologies used for valuing financial instruments have been categorized into three broad levels as follows:

Level 1 - Quoted prices in active markets for identical instruments.

Level 2 - Valuations based principally on other observable market parameters, including:

• Quoted prices in active markets for similar instruments;

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• Quoted prices in less active or inactive markets for identical or similar instruments;

• Other observable inputs (such as risk free interest rates, yield curves, volatilities, prepayment speeds, loss severities, credit risks and default rates); and

• Market corroborated inputs (derived principally from or corroborated by observable market data).

Level 3 - Valuations based significantly on unobservable inputs, including:

• Valuations based on third-party indications (broker quotes or counterparty quotes) which were, in turn, based significantly on unobservable inputs or were otherwise not supportable; and

• Valuations based on internal models with significant unobservable inputs.

These levels form a hierarchy. We follow this hierarchy for our financial instruments measured or disclosed at fair value on a recurring and nonrecurring basis and other required fair value disclosures. The classifications are based on the lowest level of input that is significant to the fair value measurement.

We use the following methods and assumptions in estimating fair value disclosures for financial instruments.

Cash and cash equivalents, restricted cash, short term investments, tenant and other receivables, prepaid expenses and other assets, deferred revenue, tenant security deposits, accounts payable and accrued expenses carrying values approximate their fair values due to the short term maturity of these instruments.

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

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

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

Derivative Instruments

We are exposed to the effect of interest rate changes and manage these risks by following policies and procedures including the use of derivatives. To manage exposure to interest rates, derivatives are used primarily to fix the rate on debt based on floating-rate indices. We also hedge exposure to the variability in future cash flows for forecast transactions over a maximum period of 11 months (excluding forecast transactions related to the payment of variable interest on existing financial instruments). We record all derivatives on the balance sheet at fair value. We incorporate credit valuation adjustments to appropriately reflect both our own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. We measure the credit risk of our derivative instruments that are subject to master netting agreements on a net basis by counterparty portfolio. For derivatives that qualify as cash flow hedges, we report the gain or loss on the derivative designated as a hedge as part of other comprehensive income (loss) and subsequently reclassify the gain or loss into income in the period that the hedged transaction affects income.

Income Taxes

We are generally not subject to federal and state income taxes as our taxable income or loss is reportable by our partners. Accordingly, no provision has been made for federal and state income taxes. ESRT has elected, together with ESRT Observatory TRS, L.L.C., our subsidiary which holds our observatory operations, to treat ESRT Observatory TRS, L.L.C. as a TRS. ESRT has elected, together with ESRT Holdings TRS, L.L.C., our subsidiary that holds our third party management, restaurant, cafeteria, health clubs and certain cleaning operations, to treat ESRT Holdings TRS, L.L.C. as a TRS. TRSs may participate in non-real estate activities and/or perform non-customary services for tenants and their operations are generally subject to regular corporate income taxes. Our TRSs account for their income taxes in accordance with GAAP, which includes

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an estimate of the amount of taxes payable or refundable for the current year and deferred tax liabilities and assets for the future tax consequences of events that have been recognized in our financial statements or tax returns. The calculation of the TRSs' tax provisions may require interpreting tax laws and regulations and could result in the use of judgments or estimates which could cause its recorded tax liability to differ from the actual amount due. Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. The TRSs periodically assess the realizability of deferred tax assets and the adequacy of deferred tax liabilities, including the results of local, state, or federal statutory tax audits or estimates and judgments used.

We apply provisions for measuring and recognizing tax benefits associated with uncertain income tax positions. Penalties and interest, if incurred, would be recorded as a component of income tax expense. As of December 31, 2018 and 2017, we do not have a liability for uncertain tax positions. As of December 31, 2018, the tax years ended December 31, 2015 through December 31, 2018 remain open for an audit by the Internal Revenue Service, state or local authorities.

Share-Based Compensation

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. The determination of fair value of these awards is subjective and involves significant estimates and assumptions including expected volatility of ESRT stock, expected dividend yield, expected term, and assumptions of whether these awards will achieve parity with other operating partnership units or achieve performance thresholds. We believe that the assumptions and estimates utilized are appropriate based on the information available to management at the time of grant.

Per Unit Data

Basic and diluted earnings per unit are computed based upon the weighted average number of shares outstanding during the respective period.

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, repositioning and disposition of our real estate assets. Our observatory segment operates 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 different marketing strategies. We account for intersegment sales and rent as if the sales or rent were to third parties, that is, at current market prices.

Reclassification

Certain prior year balances have been reclassified to conform to our current year presentation. The 2017 and 2016 balance of other revenues and fees has been reclassified to separately present lease termination fees and interest income and conform to our current year presentation.

Recently Issued or Adopted Accounting Standards

During August 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2018-15, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (a consensus of the FASB Emerging Issues Task Force), which contain amendments that align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal use software license). Accordingly, for entities in a hosting arrangement that is a service contract, costs for implementation activities in the application development stage are capitalized depending on the nature of the costs, while costs incurred during the preliminary project and post-implementation stages are expensed as the activities are performed. The amendments in ASU No. 2018-15 also require the entity (customer) to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement. The amendments are effective for public business entities for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption of the amendments is permitted, including adoption in any interim period. The amendments in ASU No. 2018-15 should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

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

During January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business, which contain amendments to clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The amendments in ASU No. 2017-01 provide a screen to determine when an integrated set of assets and activities (collectively referred to as a “set”) is not a business. The screen requires that when substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. This screen reduces the number of transactions that need to be further evaluated. If the screen is not met, the amendments (1) require that to be considered a business, a set must include, at a minimum, an input and a substantive process that together significantly contribute to the ability to create output and (2) remove the evaluation of whether a market participant could replace missing elements. The amendments provide a framework to assist entities in evaluating whether both an input and a substantive process are present. Additionally, these amendments narrow the definition of the term output so that the term is consistent with how outputs are described in Topic 606, Revenue from Contracts with Customers. ASU No. 2017-01 will be effective for annual periods beginning after December 15, 2017, including interim periods within those periods. The amendments should be applied prospectively on or after the effective date. No disclosures are required at transition. We believe that future acquisitions of real estate properties will be considered asset acquisitions.

During November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, which contain amendments that require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. ASU No. 2016-18 will be effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. The amendments should be applied using a retrospective transition method to each period presented. We adopted this standard on January 1, 2018 using a retrospective transition method. The adoption did not have a material impact on our consolidated financial statements.

During August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. ASU No. 2016-15 will be effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Earlier adoption is permitted including adoption in an interim period. We adopted this standard on January 1, 2018 using a retrospective transition method. The adoption did not have a material impact 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. During November 2018, the FASB issued ASU No. 2018-19 Codification Improvements to Topic 326, Financial Instruments—Credit Losses which contain amendments relating to the transition and effective date requirements for nonpublic business entities and also clarified that receivables arising from operating leases are not within the scope of Subtopic 326-20, Financial Instruments—Credit Losses—Measured at Amortized Cost. ASU No. 2016-13 and ASU No. 2018-19 will be effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Earlier adoption as of the fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, is permitted. The amendments must be adopted through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective (that is, a modified retrospective approach). We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

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During February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which requires that a lessee recognize in the statement of financial position a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. ASU No. 2016-02 leaves the accounting for leases by lessors largely unchanged from previous GAAP. ASU No. 2016-02 will be effective for fiscal years beginning after December 15, 2018 and subsequent interim periods. The new standard must be adopted using a modified retrospective transition, and provides for certain practical expedients. Transition will require application of the new guidance at the beginning of the earliest comparative period presented. This ASU is expected to result in the recognition of a right-to-use asset and related liability to account for our future obligations under our ground lease agreements for which we are the lessee. As of December 31, 2018, the remaining contractual payments under our ground lease agreements aggregated $75.9 million. In addition, under ASU 2016-02, lessors may only capitalize incremental direct leasing costs. As a result, we expect that we will no longer capitalize our non-contingent leasing costs and instead will expense these costs as incurred. These costs totaled $4.6 million for the year ended December 31, 2018. During July 2018, the FASB issued ASU No. 2018-10, Codification Improvements to Topic 842, Leases, which contains amendments which are intended to clarify or to correct unintended application of ASU No. 2016-02. Also during July 2018, the FASB issued ASU No. 2018-11, Targeted Improvements to Topic 842, Leases, which provides another transition method in addition to the existing modified retrospective transition method by allowing a cumulative effect adjustment to the opening balance of retained earnings in the period of adoption. The amendments in ASU No. 2018-11 also provide lessors with a practical expedient, by class of underlying asset, to not separate nonlease components from the associated lease component provided that (1) the timing and pattern of transfer are the same for the nonlease components and associated lease component and (2) the lease component, if accounted separately, would be classified as an operating lease. During December 2018, the FASB issued ASU No. 2018-20, Narrow-Scope Improvements for Lessors that contain amendments to further help lessors apply ASU No. 2016-02, including amendments that require lessors to (1) exclude lessor costs paid directly by lessees to third parties on the lessor's behalf from variable payments and therefore variable lease revenue and (2) include lessor costs that are paid by the lessor and reimbursed by the lessee in the measurement of variable lease revenue and the associated expense. For entities that have not yet adopted ASU No. 2016-02, the effective dates and transition requirements for ASU No. 2018-10, ASU No. 2018-11 and ASU No. 2018-20 will be the same as the effective date and transition requirements in ASU No. 2016-02. We adopted this standard on January 1, 2019 and elected the available practical expedients. ASU 2016-02 and its related amendments resulted in the recognition of right-of-use assets and lease liabilities for our operating leases on our balance sheet of approximately $30.0 million, but did not have an impact on our consolidated statements of income.

During May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which replaces all current GAAP guidance related to revenue recognition and eliminates 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. We adopted this standard on January 1, 2018 and it did not have a material impact on our consolidated financial statements.

3. Deferred Costs, Acquired Lease Intangibles and Goodwill

Deferred costs, net, consisted of the following at December 31, 2018 and 2017 (amounts in thousands):

	2018			2017
Leasing costs	$	178,120		$	164,751
Acquired in-place lease value and deferred leasing costs	214,550			237,364
Acquired above-market leases	52,136			67,415
	444,806			469,530
Less: accumulated amortization	(209,839		)	(215,102		)
Total deferred costs, net, excluding net deferred financing costs	$	234,967		$	254,428

At December 31, 2018 and 2017, $6.3 million and $8.3 million, respectively, of net deferred financing costs associated with the unsecured revolving credit facility was included in deferred costs, net on the consolidated balance sheets.

Amortization expense related to deferred leasing and acquired deferred leasing costs was $26.3 million, $24.1 million, and $24.2 million, for the years ended December 31, 2018, 2017, and 2016, respectively. Amortization expense related to

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acquired lease intangibles was $12.1 million, $17.1 million and $24.6 million for the years ended December 31, 2018, 2017 and 2016, respectively.

Amortizing acquired intangible assets and liabilities consisted of the following at December 31, 2018 and 2017 (amounts in thousands):     

	2018			2017
Acquired below-market ground leases	$	396,916		$	396,916
Less: accumulated amortization	(36,518		)	(28,687		)
Acquired below-market ground leases, net	$	360,398		$	368,229

	2018			2017
Acquired below-market leases	$	(118,462	)	$	(132,026	)
Less: accumulated amortization	66,012			65,979
Acquired below-market leases, net	$	(52,450	)	$	(66,047	)

Rental revenue related to the amortization of below market leases, net of above market leases was $6.1 million, $5.7 million and $8.8 million for the years ended December 31, 2018, 2017 and 2016, respectively. The remaining weighted-average amortization period as of December 31, 2018 is 24.5 years, 4.5 years, 3.8 years and 4.0 years for below-market ground leases, in-place leases and deferred leasing costs, above-market leases and below-market leases, respectively. We expect to recognize amortization expense and rental revenue from the acquired intangible assets and liabilities as follows (amounts in thousands):

For the year ending:	Future Ground Rent Amortization		Future Amortization Expense		Future Rental Revenue
2019	$	7,831	$	15,829	$	6,875
2020	7,831		12,967		3,651
2021	7,831		11,250		2,868
2022	7,831		10,433		3,185
2023	7,831		9,756		3,181
Thereafter	321,243		31,690		9,532
	$	360,398	$	91,925	$	29,292

As of December 31, 2018, we had goodwill of $491.5 million. In 2013, we acquired the interests in Empire State Building Company, L.L.C. and 501 Seventh Avenue Associates, L.L.C. for an amount in excess of their net tangible and identified intangible assets and liabilities and as a result we recorded goodwill related to the transaction. Goodwill was allocated $227.5 million to the observatory operations of the Empire State Building, $250.8 million to Empire State Building, and $13.2 million to 501 Seventh Avenue.

We performed an annual review of goodwill for impairment and concluded there was no impairment of goodwill. Our methodology to review goodwill impairment, which includes a significant amount of judgment and estimates, provides a reasonable basis to determine whether impairment has occurred. However, many of the factors employed in determining whether or not goodwill is impaired are outside of our control and it is reasonably likely that assumptions and estimates will change in future periods.

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4. Debt

Debt consisted of the following as of December 31, 2018 and 2017 (amounts in thousands):

							As of December 31, 2018
	Principal Balance as of December 31, 2018			Principal Balance as of December 31, 2017			Stated Rate		Effective Rate(1)		Maturity Date(2)
Fixed rate mortgage debt
Metro Center	$	91,838		$	93,948		3.59	%	3.68	%	11/5/2024
10 Union Square	50,000			50,000			3.70	%	3.97	%	4/1/2026
1542 Third Avenue	30,000			30,000			4.29	%	4.53	%	5/1/2027
First Stamford Place(3)	180,000			180,000			4.28	%	4.45	%	7/1/2027
1010 Third Avenue and 77 West 55th Street	38,995			39,710			4.01	%	4.22	%	1/5/2028
10 Bank Street	33,779			34,602			4.23	%	4.35	%	6/1/2032
383 Main Avenue	30,000			30,000			4.44	%	4.55	%	6/30/2032
1333 Broadway	160,000			66,602			4.21	%	4.29	%	2/5/2033
1400 Broadway
(first lien mortgage loan)	—			66,632			—		—		—
(second lien mortgage loan)	—			9,172			—		—		—
111 West 33rd Street
(first lien mortgage loan)	—			74,045			—		—		—
(second lien mortgage loan)	—			9,369			—		—		—
1350 Broadway	—			37,144			—		—		—
Total mortgage debt	614,612			721,224
Senior unsecured notes - exchangeable	250,000			250,000			2.63	%	3.93	%	8/15/2019
Senior unsecured notes: (4)
Series A	100,000			100,000			3.93	%	3.96	%	3/27/2025
Series B	125,000			125,000			4.09	%	4.12	%	3/27/2027
Series C	125,000			125,000			4.18	%	4.21	%	3/27/2030
Series D	115,000			115,000			4.08	%	4.11	%	1/22/2028
Series E	160,000			—			4.26	%	4.27	%	3/22/2030
Series F	175,000			—			4.44	%	4.45	%	3/22/2033
Unsecured revolving credit facility (4)	—			—			(5)		(5)		8/29/2021
Unsecured term loan facility (4)	265,000			265,000			(6)		(6)		8/29/2022
Total principal	1,929,612			1,701,224
Unamortized (discount) premiums, net of unamortized premiums (discount)	(1,647		)	(3,370		)
Deferred financing costs, net	(9,032		)	(9,133		)
Total	$	1,918,933		$	1,688,721

______________

(1) The effective rate is the yield as of December 31, 2018, including the effects of debt issuance costs and the amortization of the fair value of debt adjustment.

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

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

(4) At December 31, 2018, we were in compliance with all debt covenants.

(5) At December 31, 2018, the unsecured revolving credit facility bears a floating rate at 30 day LIBOR plus 1.10%. The rate at December 31, 2018 was 3.60%.

(6) The unsecured term loan facility bears a floating rate at 30 day LIBOR plus 1.20%. Pursuant to an interest rate swap agreement, the LIBOR rate is fixed at 2.1485% through maturity. The rate at December 31, 2018 was 3.35% .

Mortgage Debt

During January 2018, we refinanced and increased our mortgage debt on 1333 Broadway from $66.6 million to $160.0 million. A portion of this increase was applied to release the $75.8 million mortgage lien on 1400 Broadway.

During March 2018, we repaid our mortgage indebtedness on 111 West 33rd Street and 1350 Broadway.

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Principal Payments

Aggregate required principal payments at December 31, 2018 are as follows (amounts in thousands):

Year	Amortization		Maturities		Total
2019	$	3,790	$	250,000	$	253,790
2020	3,938		—		3,938
2021	4,090		—		4,090
2022	5,628		265,000		270,628
2023	7,876		—		7,876
Thereafter	33,868		1,355,422		1,389,290
Total principal maturities	$	59,190	$	1,870,422	$	1,929,612

Deferred Financing Costs

Deferred financing costs, net, consisted of the following at December 31, 2018 and 2017 (amounts in thousands):     

	2018			2017
Financing costs	$	25,315		$	24,446
Less: accumulated amortization	(10,027		)	(7,039		)
Total deferred financing costs, net	$	15,288		$	17,407

At December 31, 2018 and 2017, $6.3 million and $8.3 million, respectively, of net deferred financing costs associated with the unsecured revolving credit facility were included in deferred costs, net on the consolidated balance sheet.

Amortization expense related to deferred financing costs was $4.1 million, $4.7 million, and $5.0 million, for the years ended December 31, 2018, 2017 and 2016, respectively, and was included in interest expense.

Unsecured Revolving Credit and Term Loan Facility

During August 2017, we entered into an amended and restated senior unsecured revolving credit and term loan facility (the “Facility”) with Bank of America, N.A., as administrative agent, Merrill Lynch, Pierce, Fenner & Smith Incorporated and Wells Fargo Securities, LLC as Joint Lead Arrangers and Joint Bookrunners, Wells Fargo, National Association and Capital One, National Association, as co-syndication agents, and the lenders party thereto. The Facility amended and restated the credit facility dated as of January 23, 2015, with Bank of America, N.A., Merrill Lynch, Goldman Sachs and the other lenders party thereto. In connection with the modification of the credit facility and term loan, we incurred a loss on early extinguishment of debt of $2.2 million which is reflected in our consolidated statement of income for the year ended December 31, 2017. This transaction extended the unsecured revolving credit and term loan facility maturity, lowered borrowing costs and added flexibility to the financial covenants.

The Facility is in the original principal amount of up to $1.365 billion which consists of a $1.1 billion revolving credit facility and a $265.0 million term loan facility. The new revolving credit facility replaced a credit facility which was due to mature in January 2019 and was undrawn when amended. The term loan facility was borrowed in full at closing and used to repay a $265.0 million term loan that had been due in 2022. We may request the Facility be increased through one or more increases in the revolving credit facility or one or more increases in the term loan facility or the addition of new pari passu term loan tranches, for a maximum aggregate principal amount not to exceed $1.75 billion.

The initial maturity of the unsecured revolving credit facility is August 2021. We have the option to extend the initial term for up to two additional 6-month periods, subject to certain conditions, including the payment of an extension fee equal to

0.0625% and 0.075% of the then outstanding commitments under the unsecured revolving credit facility on the first and the second extensions, respectively. The term loan facility matures on August 2022. We may prepay the loans under the Facility at any time, subject to reimbursement of the lenders’ breakage and redeployment costs in the case of prepayment of Eurodollar Rate borrowings.

The 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

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secured indebtedness will not exceed 40% of total asset value, (iii) tangible net worth will not be less than $1.2 billion plus 75% of net equity proceeds received by 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 Facility) to consolidated fixed charges will not be less than 1.50x, (v) the aggregate net operating income with respect to all unencumbered eligible properties to the portion of interest expense attributable to unsecured indebtedness will not be less than 1.75x, and (vi) the ratio of total unsecured indebtedness to unencumbered asset value will not exceed 60%.

The Facility contains customary covenants, including limitations on liens, investment, distributions, debt, fundamental changes, and transactions with affiliates, and requires certain customary financial reports. The 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 (defined in the agreement for the Facility).

As of December 31, 2018, we were in compliance with the covenants under the Facility.

Senior Unsecured Notes Exchangeable

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. Interest on the 2.625% Exchangeable Senior Notes is payable semi-annually in arrears on February 15 and August 15 of each year. The 2.625% Exchangeable Senior Notes are senior unsecured obligations and rank equally in right of payment with all of our other senior unsecured indebtedness and effectively subordinated in right of payment to all of our secured indebtedness (to the extent of the value of the collateral securing such indebtedness) and structurally subordinated to all liabilities and preferred equity of our subsidiaries.

The 2.625% Exchangeable Senior Notes will mature on August 15, 2019, unless earlier exchanged, redeemed or repurchased. Holders may exchange their 2.625% Exchangeable Senior Notes at their option at any time prior to the close of business on the business day immediately preceding May 15, 2019 only under the following circumstances: (i) during any calendar quarter beginning after September 30, 2014 (and only during such quarter) if the closing sale price of our Class A common stock is more than 130% of the then current exchange price for at least 20 trading days (whether or not consecutive) in the period of the 30 consecutive trading days ending on the last trading day of the previous calendar quarter; (ii) during the five consecutive business-day period following any five consecutive trading-day period in which the trading price per 1,000 principal amount of the 2.625% Exchangeable Senior Notes for each trading day during such five consecutive trading-day period in which the trading price per 1,000 principal amount of the 2.625% Exchangeable Senior Notes for each trading day during such five trading-day period was less than 98% of the closing sale price of our Class A common stock, for each trading day during such five trading-day period multiplied by the then current exchange rate; (iii) if we call any or all of the 2.625% Exchangeable Senior Notes for redemption, at any time prior to the close of business on the scheduled trading day immediately preceding the redemption date; or (iv) upon the occurrence of specified corporate transactions (significant consolidation, sale, merger, share exchange, fundamental change, etc.).

On or after May 15, 2019, and on or prior to the second scheduled trading day immediately preceding the maturity date, holders may exchange their notes without regard to the foregoing conditions.

The 2.625% Exchangeable Senior Notes will be exchangeable into cash, shares of Class A common stock or a combination of cash and shares of Class A common stock, at our election. We have asserted it is our intent and ability to settle the principal amount of the 2.625% Exchangeable Senior Notes in cash. The initial exchange rate of 2.625% Exchangeable Senior Notes is 51.4059 shares per $1,000 principal amount of notes (equivalent to an initial exchange price of approximately $19.45 per share of Class A common stock), subject to adjustment, as described in the related indenture governing the 2.625% Exchangeable Senior Notes. As of December 31, 2018, the exchange rate of the 2.625% Exchangeable Senior Notes was 52.0116 shares per $1,000 principal amount of notes (equivalent to an initial exchange price of approximately $19.23 per share of Class A common stock), subject to adjustment, as described in the related indenture governing the 2.625% Exchangeable Senior Notes.

Following certain corporate transactions which constitute a make-whole fundamental change (defined in the indenture), we will increase the exchange rate for holders who elect to exchange their 2.625% Exchangeable Senior Notes in connection with such make whole fundamental change in certain circumstances. Following certain corporate transactions which constitute a fundamental change, holders may require us to repurchase the 2.625% Exchangeable Senior Notes for cash at a

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price equal to 100% of the principal amount of the notes to be purchased plus any accrued and unpaid interest to, but excluding, the repurchase date.

We have separately accounted for the liability and equity components of the 2.625% Exchangeable Senior Notes by bifurcating gross proceeds between the indebtedness, or liability component, and the embedded conversion option, or the equity component. The bifurcation was done by estimating an effective interest rate as of the date of the issuance for similar notes which do not contain an embedded conversion option. This effective interest rate was estimated to be 3.8% and was used to compute the fair value at the time of issuance for the indebtedness of $236.6 million. The gross proceeds from the issuance of the 2.625% Exchangeable Senior Notes less the initial amount allocated to the indebtedness resulted in a $13.4 million allocation to the embedded conversion option which is included in Equity, net of financing costs, in the consolidated balance sheets as of December 31, 2018 and 2017. The resulting debt discount is being amortized over the five year period in which the 2.625% Exchangeable Senior Notes are expected to be outstanding (that is, through maturity date) as additional non-cash interest expense. As of December 31, 2018 and 2017, the unamortized discount was $1.6 million and $4.3 million, respectively.

Underwriting discounts and commissions and issuance costs totaled $3.1 million and were allocated to the indebtedness and the embedded conversion option on a pro-rata basis and accounted for as debt issuance costs and equity issuance costs, respectively. In this connection, $2.9 million attributable to the indebtedness was recorded as part of deferred costs, to be subsequently amortized using the effective interest method as interest expense over the expected term of the 2.625% Exchangeable Senior Notes, and $0.2 million attributable to the embedded conversion option was recorded as a reduction to Equity in the consolidated balance sheets as of December 31, 2018 and 2017.

For the years ended December 31, 2018, 2017 and 2016, total interest expense related to the 2.625% Exchangeable Senior Notes was $9.9 million, $9.9 million and $9.9 million, respectively, consisting of (i) contractual interest expense of $6.6 million, $6.6 million and $6.6 million, respectively, (ii) additional non-cash interest expense of $2.7 million, $2.7 million and $2.7 million, respectively, related to the accretion of the debt discount, and (iii) amortization of deferred financing costs of $0.6 million, $0.6 million and $0.6 million, respectively.

Senior Unsecured Notes

During December 2017, we entered into an agreement to issue and sell an aggregate principal amount of $450.0 million of senior unsecured notes consisting of $115.0 million of 4.08% Series D Senior Notes due 2028, $160.0 million of 4.26% Series E Senior Notes due 2030, and $175.0 million of 4.44% Series F Senior Notes due 2033. We issued and sold the Series D Senior Notes in December 2017 and the Series E and F Senior Notes in March 2018. In connection with the March

2018 issuance of the notes, we repaid our mortgage indebtedness on 111 West 33rd Street and 1350 Broadway.

The terms of the Series A, B, C, D, E, and F senior notes agreements include customary covenants, including limitations on liens, investment, distributions, debt, fundamental changes, and transactions with affiliates and require certain customary financial reports. It also 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, and a maximum unsecured leverage ratio. As of December 31, 2018, we were in compliance with the covenants under the outstanding Senior Unsecured Notes.

5. Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses consist of the following as of December 31, 2018 and 2017 (amounts in thousands):

	2018		2017
Accrued capital expenditures	$	85,242	$	71,769
Accounts payable and accrued expenses	34,585		32,509
Interest rate swap agreements liability	5,243		436
Accrued interest payable	4,990		5,687
Due to affiliated companies	616		448
Total accounts payable and accrued expenses	$	130,676	$	110,849

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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 December 31, 2018, 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 $5.3 million. If we had breached any of these provisions at December 31, 2018, we could have been required to settle our obligations under the agreements at their termination value of $5.3 million.

As of December 31, 2018 and 2017, we had interest rate LIBOR swaps with an aggregate notional value of $515.0 million and $265.0 million, respectively, which were designated as cash flow hedges of interest rate risk. We are hedging variability in future cash flows associated with our existing variable-rate term loan facility and with a forecasted refinancing of our exchangeable senior notes. The notional value does not represent exposure to credit, interest rate or market risks. As of December 31, 2018, the fair value of these derivative instruments amounted to $2.5 million which is included in prepaid expenses and other assets and ($5.2 million) which is included in accounts payable and accrued expenses on the consolidated balance sheet. As of December 31, 2017, the fair value of the derivative instrument amounted to ($0.4 million) which is included in accounts payable and accrued expenses on the consolidated balance sheet.

As of December 31, 2018 and 2017, a net unrealized loss of $0.9 million and $10.5 million, respectively, is reflected in the consolidated statements of comprehensive income (loss) relating to both active and terminated cash flow hedges of interest rate risk. Amounts reported in accumulated other comprehensive income (loss) related to derivatives will be reclassified to interest expense as interest payments are made on the debt. We estimate that $0.9 million net loss of the current balance held in accumulated other comprehensive loss will be reclassified into interest expense within the next 12 months.

For the year ended December 31, 2017, we recognized a loss of $0.3 million from derivative financial instruments, incurred in connection with the partial termination and re-designation of related cash flow hedges.

The table below summarizes the terms of agreements and the fair values of our derivative financial instruments as of December 31, 2018 and 2017 (dollar amounts in thousands):     

								December 31, 2018					December 31, 2017
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	$	2,536	$	—		$	—	$	(436	)
Interest rate swap	125,000		3 Month LIBOR	2.9580	%	July 1, 2019	July 1, 2026	—		(2,623		)	—		—
Interest rate swap	125,000		3 Month LIBOR	2.9580	%	July 1, 2019	July 1, 2026	—		(2,620		)	—		—
								$	2,536	$	(5,243	)	$	—	$	(436	)

The table below shows the effect of our derivative financial instruments designated as cash flow hedges on accumulated other comprehensive income (loss) for the years ended December 31, 2018, 2017 and 2016 (amounts in thousands):    

Effects of Cash Flow Hedges	December 31, 2018			December 31, 2017			December 31, 2016
Amount of gain (loss) recognized in other comprehensive income (loss)	$	(2,721	)	$	(11,658	)	$	(3,054	)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense	(1,845		)	(1,142		)	—

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The table below shows the effect of our derivative financial instruments designated as cash flow hedges on the consolidated statements of income for the years ended December 31, 2018, 2017 and 2016 (amounts in thousands):

Effects of Cash Flow Hedges	December 31, 2018			December 31, 2017			December 31, 2016
Total interest (expense) presented on the consolidated statements of income in which the effects of cash flow hedges are recorded	$	(79,623	)	$	(68,473	)	$	(70,595	)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense	(1,845		)	(1,142		)	—

Fair Valuation

The estimated fair values at December 31, 2018 and 2017 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 following tables summarize the carrying and estimated fair values of our financial instruments as of December 31, 2018 and 2017 (amounts in thousands):

	December 31, 2018
	Carrying Value		Estimated Fair Value
			Total		Level 1		Level 2		Level 3
Interest rate swaps included in prepaid expenses and other assets	$	2,536	$	2,536	$	—	$	2,536	$	—
Interest rate swaps included in accounts payable and accrued expenses	5,243		5,243		—		5,243		—
Mortgage notes payable	608,567		597,424		—		—		597,424
Senior unsecured notes - Exchangeable	247,930		250,625		—		250,625		—
Senior unsecured notes - Series A, B, C, D, E and F	798,289		795,662		—		—		795,662
Unsecured term loan facility	264,147		265,000		—		—		265,000

	December 31, 2017
	Carrying Value		Estimated Fair Value
			Total		Level 1		Level 2		Level 3
Interest rate swaps included in prepaid expenses and other assets	$	—	$	—	$	—	$	—	$	—
Interest rate swaps included in accounts payable and accrued expenses	436		436		—		436		—
Mortgage notes payable	717,164		707,300		—		—		707,300
Senior unsecured notes - Exchangeable	244,739		275,723		—		275,723		—
Senior unsecured notes - Series A, B, C, D, E and F	463,156		460,352		—		—		460,352
Unsecured term loan facility	263,662		265,000		—		—		265,000

Disclosure about the fair value of financial instruments is based on pertinent information available to us as of December 31, 2018 and 2017. Although we are not aware of any factors that would significantly affect the reasonable fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since that date and current estimates of fair value may differ significantly from the amounts presented herein.

7. Rental Income

We lease various spaces to tenants over various terms. 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

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or common area maintenance known as operating expense escalation. Operating expense reimbursements are reflected in our consolidated statements of income as tenant expense reimbursement.

As of December 31, 2018, we were entitled to the following future contractual minimum lease payments on non-cancellable operating leases to be received which expire on various dates through 2038 (amounts in thousands):

2019	$	485,441
2020	460,127
2021	423,365
2022	391,395
2023	362,738
Thereafter	1,536,461
	$	3,659,527

The above future minimum lease payments exclude tenant recoveries, amortization of deferred rent receivables and the net accretion of above-below-market lease intangibles. Some leases are subject to termination options generally upon payment of a termination fee. The preceding table is prepared assuming such options are not exercised.

8. Commitments and Contingencies

Legal Proceedings

Litigation

Except as described below, as of December 31, 2018, we were not involved in any material litigation, nor, to our knowledge, was any material litigation threatened against us or our properties, other than routine litigation arising in the ordinary course of business such as disputes with tenants. We believe that the costs and related liabilities, if any, which may result from such actions will not materially affect our condensed consolidated financial position, operating results or liquidity.    

As previously disclosed, in October 2014, 12 former investors in Empire State Building Associates L.L.C. (“ESBA”), which prior to the initial public offering of our company (the "Offering"), owned the fee title to the Empire State Building, filed an arbitration with the American Arbitration Association against Peter L. Malkin, Anthony E. Malkin, Thomas N. Keltner, Jr., and our subsidiary ESRT MH Holdings LLC, the former supervisor of ESBA, as respondents. The statement of claim (also filed later in federal court in New York for the expressed purpose of tolling the statute of limitations) alleges breach of fiduciary duty and related claims in connection with the Offering and formation transactions and seeks monetary damages and declaratory relief. These investors had opted out of a prior class action bringing similar claims that was settled with court approval. The respondents filed an answer and counterclaims. In March 2015, the federal court action was stayed on consent of all parties pending the arbitration. Arbitration hearings for a select number of sessions started in May 2016 and concluded in August 2018. Post-hearing briefing is currently scheduled to be completed by June 25, 2019.

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

Pursuant to indemnification agreements which were made with our directors, executive officers and chairman emeritus as part of our formation transactions, Anthony E. Malkin, Peter L. Malkin and Thomas N. Keltner, Jr. have defense and indemnity rights from us with respect to this arbitration.

Ground Lease Commitments

We make payments under ground leases related to three of our properties. Minimum rent is expensed on a straight-line basis over the non-cancellable term of the leases. The ground leases are due to expire between the years 2050 and 2077. Future minimum lease payments to be paid over the terms of the leases are as follows (amounts in thousands):

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2019	$	1,518
2020	1,518
2021	1,518
2022	1,518
2023	1,518
Thereafter	68,298
Total	$	75,888

Unfunded Capital Expenditures

At December 31, 2018, we estimate that we will incur approximately $88.4 million of capital expenditures (including tenant improvements and leasing commissions) on our properties pursuant to existing lease agreements. We expect to fund these capital expenditures with operating cash flow, additional property level mortgage financings, our unsecured credit facility, cash on hand and other borrowings. Future property acquisitions may require substantial capital investments for refurbishment and leasing costs. We expect that these financing requirements will be met in a similar fashion.

Concentration of Credit Risk

Financial instruments that subject us to credit risk consist primarily of cash and cash equivalents, restricted cash, short-term investments, tenant and other receivables and deferred rent receivables. At December 31, 2018, we held on deposit at various major financial institutions cash and cash equivalents, restricted cash balances and short-term investments in excess of amounts insured by the Federal Deposit Insurance Corporation.

Real Estate Investments

Our properties are located in Manhattan, New York; Fairfield County, Connecticut; and Westchester County, New York. The latter locations are suburbs of the city of New York. The ability of the tenants to honor the terms of their respective leases is dependent upon the economic, regulatory and social factors affecting the markets in which the tenants operate. We perform ongoing credit evaluations of our tenants for potential credit losses.

Tenant Credit Evaluations

Our investments in real estate properties are subject to risks incidental to the ownership and operation of commercial real estate. These risks include, among others, the risks normally associated with changes in general economic conditions, trends in the real estate industry, creditworthiness of tenants, competition of tenants and customers, changes in tax laws, interest rate levels, the availability and cost of financing, and potential liability under environmental and other laws.

We may require tenants to provide some form of credit support such as corporate guarantees and/or other financial guarantees and we perform ongoing credit evaluations of tenants. Although the tenants operate in a variety of industries, to the extent we have a significant concentration of rental revenue from any single tenant, the inability of that tenant to make its lease payments could have an adverse effect on our company.

Major Customers and Other Concentrations

For the year ended December 31, 2018, other than five tenants who accounted for 6.0%, 3.1%, 2.9%, 2.0% and 2.0% of rental revenues, no other tenant in our portfolio accounted for more than 2.0% of rental revenues. For the year ended December 31, 2017, other than five tenants who accounted for 6.3%, 3.2%, 2.9%, 2.1% and 2.0% of rental revenues, no other tenant in our portfolio accounted for more than 2.0% of rental revenues. For the year ended December 31, 2016, other than five tenants who accounted for 6.4%, 3.3%,2.9%, 2.3% and 2.0% of rental revenues, no other tenant in our portfolio accounted for more than 2.0% of rental revenues.

For the years ended December 31, 2018, 2017 and 2016, the six properties listed below accounted for the indicated percentage of total rental revenues. No other property accounted for more than 5.0% of total rental revenues.

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	Year Ended December 31,
	2018		2017		2016
Empire State Building	31.9	%	32.0	%	32.6	%
One Grand Central Place	12.8	%	13.1	%	12.5	%
111 West 33rd Street	9.3	%	8.6	%	6.8	%
1400 Broadway	7.1	%	7.4	%	7.8	%
First Stamford Place	5.9	%	5.4	%	6.4	%
250 West 57th Street	5.2	%	5.2	%	5.3	%

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 December 31, 2018, 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 December 31, 2018, 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 and combined 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.

Multiemployer Pension and Defined Contribution Plans

We contribute to a number of multiemployer defined benefit pension plans under the terms of collective bargaining agreements that cover our union-represented employees. The risks of participating in these multiemployer plans are different from single-employer plans in the following respects:

• Assets contributed to the multiemployer plan by one employer may be used to provide benefits to employees of other participating employers.

• If a participating employer stops contributing to the plan, the unfunded obligations of the plan may be borne by the remaining participating employers.

• If we choose to stop participating in some of our multiemployer plans, we may be required to pay those plans an amount based on the underfunded status of the plan, referred to as a withdrawal liability.

We participate in various unions. The union in which we have significant employees and costs is 32BJ.

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32BJ

We participate in the Building Service 32BJ, ("Union"), Pension Plan and Health Plan. The Pension Plan is a multi-employer, non-contributory defined benefit pension plan that was established under the terms of collective bargaining agreements between the Service Employees International Union, Local 32BJ, the Realty Advisory Board on Labor Relations, Inc. and certain other employers. This Pension Plan is administered by a joint board of trustees consisting of union trustees and employer trustees and operates under employer identification number 13-1879376. The Pension Plan year runs from July 1 to June 30. Employers contribute to the Pension Plan at a fixed rate on behalf of each covered employee. Separate actuarial information regarding such pension plans is not made available to the contributing employers by the union administrators or trustees, since the plans do not maintain separate records for each reporting unit. However, on September 28, 2016, September 28, 2017 and September 28, 2018, the actuary certified that for the plan years beginning July 1, 2016, July 1, 2017 and July 1, 2018, respectively, the Pension Plan was in critical status under the Pension Protection Act of 2006. The Pension Plan trustees adopted a rehabilitation plan consistent with this requirement. For each of the years ended June 30, 2018, 2017 and 2016, the Pension Plan received contributions from employers totaling $272.3 million, $257.8 million and $249.5 million, respectively.

The Health Plan was established under the terms of collective bargaining agreements between the Union, the Realty Advisory Board on Labor Relations, Inc. and certain other employers. The Health Plan provides health and other benefits to eligible participants employed in the building service industry who are covered under collective bargaining agreements, or other written agreements, with the Union. The Health Plan is administered by a Board of Trustees with equal representation by the employers and the Union and operates under employer identification number 13-2928869. The Health Plan receives contributions in accordance with collective bargaining agreements or participation agreements. Generally, these agreements provide that the employers contribute to the Health Plan at a fixed rate on behalf of each covered employee. For the years ended June 30, 2018, 2017 and 2016, the Health Plan received contributions from employers totaling $1.4 billion, $1.3 billion and $1.2 billion, respectively.

Term of Collective Bargaining Agreement

The most recent collective bargaining agreement for Local 32BJ commenced from January 1, 2016 and runs through December 31, 2019.

Contributions

Contributions we made to the multi-employer plans for the years ended December 31, 2018, 2017 and 2016 are included in the table below (amounts in thousands):

	For the Year Ended December 31,
Benefit Plan	2018		2017		2016
Pension Plans (pension and annuity)*	$	3,327	$	3,035	$	3,155
Health Plans**	9,373		8,551		8,280
Other***	814		856		542
Total plan contributions	$	13,514	$	12,442	$	11,977

* Pension plans include $1.0 million, $0.9 million and $0.8 million for the years ended 2018, 2017 and 2016, respectively, to multiemployer plans not discussed above.

** Health plans include $1.6 million, $1.6 million and $1.6 million for the years ended 2018, 2017 and 2016, respectively, to multiemployer plans not discussed above.

*** Other consists of union costs which were not itemized between pension and health plans. Other includes $0.2 million, $0.2 million and $0.2 million for the years ended 2018, 2017 and 2016, respectively, in connection with other multiemployer plans not discussed above.

Benefit plan contributions are included in operating expenses in our consolidated statements of income.

9. Capital

During 2016, Q REIT Holding LLC, a Qatar Financial Centre limited liability company and a wholly owned subsidiary of the Qatar Investment Authority, a governmental authority of the State of Qatar ("QREIT", and together with any eligible transferee, "QIA"), purchased 29,610,854 newly issued ESRT Class A common shares at $21.00 per share, resulting in

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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.

During the second quarter of 2018, pursuant to an August 2016 stockholders agreement between ESRT and QIA, ESRT sold 284,015 shares of ESRT Class A common stock (the “Top Up Shares”) to QIA pursuant to its top-up right to acquire its 9.9% pro rata share of new equity securities issued during the first quarter of 2018 (in this case, equity compensation).  The aggregate purchase price which QIA paid to ESRT for the Top Up Shares was $4.7 million, or $16.72 per share of ESRT Class A common stock, in accordance with a formula in the stockholders agreement equal to the average closing price per share during the five (5) consecutive trading days immediately preceding the issuance of the applicable new equity securities.

As of December 31, 2018, there were approximately 303.3 million operating partnership units outstanding, of which approximately 174.9 million, or 57.7%, were owned by ESRT and approximately 128.4 million, or 42.3%, 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 Empire State Realty Trust Inc. 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 operating partnership units on a one-for-one basis.     

LTIP units subject to time based vesting, whether vested or not, receive the same per unit distributions as OP Units, which equal per share dividends (both regular and special) on our common stock. Market based LTIP units 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.

Private Perpetual Preferred Units

As of December 31, 2018, there were 1,560,360 Private Perpetual Preferred Units ("Preferred Units") which have a liquidation preference of $16.62 per unit and which are entitled to receive cumulative preferential annual cash distributions of $0.60 per unit payable in arrears on a quarterly basis. The Preferred Units are not redeemable at the option of the holders and are redeemable at our option only in the case of specific defined events.

Distributions

The following table summarizes the distributions paid on our operating partnership units for the years ended December 31, 2018, 2017 and 2016:

Record Date	Payment Date	Amount per Operating Partnership Unit
December 17, 2018	December 31, 2018	$0.105
September 14, 2018	September 28, 2018	$0.105
June 15, 2018	June 29, 2018	$0.105
March 15, 2018	March 30, 2018	$0.105
December 15, 2017	December 29, 2017	$0.105
September 15, 2017	September 29, 2017	$0.105
June 15, 2017	June 30, 2017	$0.105
March 15, 2017	March 31, 2017	$0.105
December 15, 2016	December 29, 2016	$0.105
September 19, 2016	September 30, 2016	$0.105
June 15, 2016	June 30, 2016	$0.105
March 16, 2016	March 31, 2016	$0.085

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Total distributions paid to OP unitholders and Preferred unitholders during 2018, 2017 and 2016 totaled $126.5 million, $127.0 million and $115.0 million, respectively.

Incentive and Share-Based Compensation

The 2013 Plan provides for grants to our directors, employees and consultants of our company and ESRT consisting of stock options, restricted stock, dividend equivalents, stock payments, performance shares, LTIP units, stock appreciation rights and other incentive awards. An aggregate of approximately 12.2 million shares of ESRT common stock are authorized for issuance under awards granted pursuant to the 2013 Plan, and as of December 31, 2018, approximately 4.3 million shares of ESRT common stock remain available for future issuance.

In May 2018, we made grants of LTIP units to our non-employee directors under the 2013 Plan. At such time, we granted a total of 65,000 LTIP units that are subject to time-based vesting with fair market values of $1.0 million. The awards vest ratably over three years from the date of the grant, subject generally to the director's continued service on our Board of Directors.

In March 2018, we made grants of LTIP units to executive officers under the 2013 Plan. At such time, we granted to executive officers a total of 386,876 LTIP units that are subject to time-based vesting and 1,737,917 LTIP units that are subject to market-based vesting awards. In March 2018, we made grants of LTIP units and restricted stock to certain other employees under the 2013 Plan. At such time, we granted to certain other employees a total of 67,449 LTIP units and 39,608 shares of restricted stock that are subject to time-based vesting and 223,950 LTIP units that are subject to market-based vesting, with fair market values of $1.7 million for the time-based vesting awards and $1.1 million for the market-based vesting awards. The awards subject to time-based vesting vest ratably over four years from January 1, 2018, subject generally to the grantee's continued employment. The first installment vests on January 1, 2019 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, 2018. 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, 2021 and the second installment vesting on January 1, 2022, subject generally to the grantee's continued employment on those dates.

In 2017, our board of directors determined to reinforce the alignment of our executive officers’ interests with that of stockholders by designing a new bonus election program, under which named executive officers could elect to receive their annual incentive bonus in any combination of (i) cash or vested LTIP's at the face amount of such bonus or (ii) time-vesting LTIP's which would vest over three years, subject to continued employment, at 125% of such face amount. In February 2018, we made grants of LTIP units to executive officers under the 2013 Plan in connection with the 2017 bonus election program. We granted to executive officers a total of 238,609 LTIP units that are subject to time based vesting with a fair market value $4.0 million. Of these LTIP units, 25,158 LTIP units vested immediately on the grant date and 213,451 LTIP units vest ratably over three years from January 1, 2018, subject generally to the grantee's continued employment. The first installment vests on January 1, 2019 and the remainder will vest thereafter in two equal annual installments.

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

In March 2017, we made grants of LTIP units to executive officers under the 2013 Plan. At such time, we granted to executive officers a total of 313,275 LTIP units that are subject to time-based vesting and 865,742 LTIP units that are subject to market-based vesting, with fair market values of $6.1 million for the time-based vesting awards and $9.6 million for the market-based vesting awards. In March 2017, we made grants of LTIP units and restricted stock to certain other employees under the 2013 Plan. At such time, we granted to certain other employees a total of 47,993 LTIP units and 34,407 shares of restricted stock that are subject to time-based vesting and 95,156 LTIP units that are subject to market-based vesting, with fair market values of $1.6 million for the time-based vesting awards and $1.0 million for the market-based vesting awards. The awards subject to time-based vesting vest ratably over four years from January 1, 2017, subject generally to the grantee's continued employment. The first installment vests on January 1, 2018 and the remainder will vest thereafter in three equal annual installments. The vesting of the LTIP units subject to performance-based vesting is based on the achievement of absolute and relative total stockholder return hurdles over a three-year performance period, commencing on January 1, 2017.

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Following the completion of the three-year performance period, our compensation committee will determine the number of LTIP units to which the grantee is entitled based on our performance relative to the performance hurdles set forth in the LTIP unit award agreements the grantee entered into in connection with the award grant. These units then vest in two installments, with the first installment vesting on January 1, 2020 and the second installment vesting on January 1, 2021, subject generally to the grantee's continued employment on those dates.

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

LTIP units and ESRT restricted stock issued during the year ended December 31, 2018, 2017 and 2016 were valued at $23.6 million, $19.4 million and $18.4 million, respectively. The weighted-average per unit or share fair value was $8.54, $13.77 and $9.60 for grants issued in 2018, 2017 and 2016, respectively. The per unit or share granted in 2018 was estimated on the respective dates of grant using the following assumptions: an expected life of 2.8 years, a dividend rate of 2.30%, a risk-free interest rate of 2.50%, and an expected price volatility of 20.0%. The per unit or share granted in 2017 was estimated on the respective dates of grant using the following assumptions: an expected life of 2.8 years, a dividend rate of 2.05%, a risk-free interest rate of 1.55% and an expected price volatility of 20.0%. The per unit or share granted in 2016 was estimated on the respective dates of grant using the following assumptions: an expected life of 2.8 years, a dividend rate of 2.10%, a risk-free interest rate of 0.84%, and an expected price volatility of 24.0%.

No other stock options, dividend equivalents, or stock appreciation rights were issued or outstanding in 2018, 2017 and 2016.

The following is a summary of ESRT restricted stock and LTIP unit activity for the year ended December 31, 2018:

	ESRT Restricted Stock		LTIP Units		Weighted Average Grant Fair Value
Unvested balance at December 31, 2017	90,791		3,588,609		$	11.20
Vested	(30,693	)	(495,303	)	14.59
Granted	39,608		2,719,801		8.54
Forfeited or unearned	(8,548	)	(110,286	)	8.50
Unvested balance at December 31, 2018	91,158		5,702,821		$	9.68

The total fair value of LTIP units and restricted stock that vested during 2018, 2017 and 2016 was $7.7 million, $7.6 million and $5.1 million, respectively.

The LTIP unit and ESRT restricted stock award agreements will immediately vest when a grantee attains the (i) 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 market-based awards, and accordingly, we recognized $1.8 million, $1.0 million and $0.7 million for the years ended December 31, 2018, 2017 and 2016, respectively. Unrecognized compensation expense was $1.0 million at December 31, 2018, which will be recognized over a weighted average period of 2.1 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 $17.0 million, $13.1 million and $9.0 million in noncash compensation expense for the years ended December 31, 2018, 2017 and 2016, respectively. Unrecognized compensation expense was $27.4 million at December 31, 2018, which will be recognized over a weighted average period of 2.2 years.

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Earnings Per Unit

Earnings per unit for the years ended December 31, 2018, 2017 and 2016 is computed as follows (amounts in thousands, except per share amounts):

	For the Year Ended December 31,
	2018			2017			2016
Numerator:
Net income	$	117,253		$	118,253		$	107,250
Private perpetual preferred unit distributions	(936		)	(936		)	(936		)
Earnings allocated to unvested shares	(851		)	(760		)	(747		)
Net income attributable to common unitholders - basic and diluted	$	115,466		$	116,557		$	105,567
Denominator:
Weighted average units outstanding - basic	297,258			296,455			276,848
Effect of dilutive securities:
Stock-based compensation plans	1			775			454
Exchangeable senior notes	—			819			266
Weighted average shares outstanding - diluted	297,259			298,049			277,568
Earnings per unit - basic and diluted	$	0.39		$	0.39		$	0.38

There were 485,865, 834,267 and 800,746 antidilutive shares and LTIP units for the years ended December 31, 2018, 2017 and 2016, respectively.

10. Related Party Transactions

QIA

In connection with any new issuance by us of common equity securities, for so long as QIA maintains at least a 5.0% fully diluted economic interest in ESRT and remains in material compliance with the terms of the stockholders agreement, QIA will have the right (but not the obligation) to purchase its pro rata share of such new equity securities in the form of newly issued shares of ESRT Class A common stock. These “top up” rights are generally exercisable on a quarterly basis, or sooner if we or ESRT issues new equity securities in an issuance in excess of $1.0 million.

Through August 2021, QIA will have the right of first offer to co-invest with ESRT as a joint venture partner in real estate investment opportunities initiated by ESRT where ESRT has elected, at its discretion, to seek a joint venture partner. The right of first offer period will be extended for a 30-month term if at least one joint venture transaction is consummated among ESRT and QIA during the initial five year term, and will be extended for a further 30-month term if at least one joint venture transaction is consummated during such initial 30-month extension term.

Subject to certain minimum thresholds and conditions, ESRT will indemnify QIA for certain applicable U.S. federal and state taxes payable by QIA in connection with dividends paid by ESRT on the QIA shares that are attributable to capital gains from the sale or exchange of any U.S. real property interests. ESRT's obligation to indemnify QIA will terminate one year following the date on which the sum of the QIA shares then owned by QIA falls below 10% of ESRT outstanding common shares.

Tax Protection Agreement

In 2013, we and ESRT entered into a tax protection agreement with Anthony E. Malkin and Peter L. Malkin that is intended to protect to a limited extent the Malkin Group and an additional third party investor in Metro Center (who was one of the original landowners and was involved in the development of the property) against certain tax consequences arising from a transaction involving one of four properties, which we refer to in this section as the protected assets.

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First, this agreement provides that our operating partnership will not sell, exchange, transfer or otherwise dispose of such protected assets, or any interest in a protected asset, until (i) October 7, 2025, with respect to one protected asset, First Stamford Place, and (ii) the later of (x) October 7, 2021 and (y) the death of both Peter L. Malkin and Isabel W. Malkin, who are 85 and 82 years old, respectively, for the three other protected assets, Metro Center, 10 Bank Street and 1542 Third Avenue, unless:

(1)Anthony E. Malkin consents to the sale, exchange, transfer or other disposition; or

(2)we deliver to each protected party thereunder a cash payment intended to approximate the tax liability arising from the recognition of the pre-contribution built-in gain resulting from the sale, exchange, transfer or other disposition of such protected asset (with the pre-contribution “built-in gain” being not more than the taxable gain that would have been recognized by such protected party if the protected asset been sold for fair market value in a taxable transaction at the time of the consolidation) plus an additional amount so that, after the payment of all taxes on amounts received pursuant to the agreement (including any tax liability incurred as a result of receiving such payment), the protected party retains an amount equal to such protected party’s total tax liability incurred as a result of the recognition of the pre-contribution built-in gain pursuant to such sale, exchange, transfer or other disposition; or

(3)the disposition does not result in a recognition of any built-in gain by the protected party.

Second, with respect to the Malkin Group, including Anthony E. Malkin and Peter L. Malkin, and one additional third party investor in Metro Center (who was one of the original landowners and was involved in the development of the property), to protect against gain recognition resulting from a reduction in such continuing investor’s share of the operating partnership liabilities, the agreement provides that during the period from October 7, 2013 until such continuing investor owns less than the aggregate number of operating partnership units and shares of ESRT common stock equal to 50% of the aggregate number of such units and shares such investor received in the formation transactions, which we refer to in this section as the tax protection period, we will (i) refrain from prepaying any amounts outstanding under any indebtedness secured by the protected assets and (ii) use our commercially reasonable efforts to refinance such indebtedness at or prior to maturity at its current principal amount, or, if we are unable to refinance such indebtedness at its current principal amount, at the highest principal amount possible. The agreement also provides that, during the tax protection period, we will make available to such continuing investors the opportunity (i) to enter into a “bottom dollar” guarantee of their allocable share of $160.0 million of our aggregate indebtedness meeting certain requirements or (ii) in the event we have recourse debt outstanding and such a continuing investor agrees, in lieu of guaranteeing debt pursuant to clause (i) above, to enter into a deficit restoration obligation, in each case, in a manner intended to provide an allocation of our liabilities to the continuing investor. In the event that a continuing investor guarantees our debt, such continuing investor will be responsible, under certain circumstances, for the repayment of the guaranteed amount to the lender in the event that the lender would otherwise recognize a loss on the loan, such as, for example, if property securing the loan was foreclosed and the value was not sufficient to repay a certain amount of the debt. A deficit restoration obligation is a continuing investor’s obligation, under certain circumstances, to contribute a designated amount of capital to us upon our liquidation in the event that our assets are insufficient to repay our liabilities.

Because we expect that we will at all times have sufficient liabilities to allow us to meet our obligations to allocate liabilities to our partners that are protected parties under the tax protection agreement, our indemnification obligation with respect to “certain tax liabilities” would generally arise only in the event that we dispose in a taxable transaction of a protected asset within the period specified above in a taxable transaction. In the event of such a disposition, the amount of our indemnification obligation would depend on several factors, including the amount of “built-in gain,” if any, recognized and allocated to the indemnified partners with respect to such disposition and the effective tax rate to be applied to such gain at the time of such disposition.

Our partnership agreement requires that allocations with respect to such acquired property be made in a manner consistent with Section 704(c) of the Code. Treasury Regulations issued under Section 704(c) of the Code provide partnerships with a choice of several methods of allocating book-tax differences. Under the tax protection agreement, we have agreed to use the “traditional method” for accounting for book-tax differences for the properties acquired by us in the consolidation. Under the traditional method, which is the least favorable method from our perspective, the carryover basis of the acquired properties in our hands (i) may cause us to be allocated lower amounts of depreciation and other deductions for tax purposes than would be allocated to us if all of the acquired properties were to have a tax basis equal to their fair market value at the time of acquisition and (ii) in the event of a sale of such properties, could cause us to be allocated gain in excess of its corresponding economic or book gain (or taxable loss that is less than its economic or book loss), with a corresponding benefit to the partners transferring such properties to us for interests in us.

F-32

Registration Rights

We entered into a registration rights agreement with certain persons receiving shares of ESRT common stock or operating partnership units in the formation transactions, including certain members of ESRT's senior management team and our other continuing investors. In connection therewith, we have filed, and are obligated to maintain the effectiveness of, an automatically effective shelf registration statement, along with a prospectus supplement, with respect to, among other things, shares of ESRT Class A common stock that may be issued upon redemption of operating partnership units or issued upon conversion of shares of ESRT Class B common stock to continuing investors in the public existing entities. Pursuant to the registration rights agreement, under certain circumstances, ESRT will also be required to undertake an underwritten offering upon the written request of the Malkin Group, which we refer to as the holder, provided (i) the registrable shares to be registered in such offering will have a market value of at least $150.0 million, (ii) ESRT will not be obligated to effect more than two underwritten offerings during any 12-month period; and (iii) the holder will not have the ability to effect more than four underwritten offerings. In addition, if ESRT files a registration statement with respect to an underwritten offering for its own account or on behalf of the holder, the holder will have the right, subject to certain limitations, to register such number of registrable shares held by him, her or it as each such holder requests. With respect to underwritten offerings on behalf of the holder, ESRT will have the right to register such number of primary shares as it requests; provided, however, that if cut backs are required by the managing underwriters of such an offering, ESRT's primary shares shall be cutback first (but in no event will our shares be cut back to less than $25.0 million).

ESRT has also agreed to indemnify the persons receiving rights against specified liabilities, including certain potential liabilities arising under the Securities Act, or to contribute to the payments such persons may be required to make in respect thereof. ESRT has agreed to pay all of the expenses relating to the registration and any underwritten offerings of such securities, including, without limitation, all registration, listing, filing and stock exchange or FINRA fees, all fees and expenses of complying with securities or “blue sky” laws, all printing expenses and all fees and disbursements of counsel and independent public accountants retained by ESRT, but excluding underwriting discounts and commissions, any out-of-pocket expenses (except ESRT will pay any holder’s out-of-pocket fees (including disbursements of such holder’s counsel, accountants and other advisors) up to $25,000 in the aggregate for each underwritten offering and each filing of a resale shelf registration statement or demand registration statement), and any transfer taxes.

Employment Agreement and Change in Control Severance Agreements

ESRT entered into an employment agreement with Anthony E. Malkin, which provides for salary, bonuses and other benefits, including among other things, severance benefits upon a termination of employment under certain circumstances and the issuance of equity awards. In addition, ESRT entered into change in control severance agreements with Thomas P. Durels, David A. Karp, Thomas N. Keltner, Jr. and John B. Kessler.

Indemnification of Our Directors and Officers

We entered into indemnification agreements with each of ESRT's directors, executive officers, chairman emeritus and certain other parties, providing for the indemnification by us for certain liabilities and expenses incurred as a result of actions brought, or threatened to be brought, against (i) ESRT's directors, executive officers and chairman emeritus and (ii) ESRT's executive officers, chairman emeritus and certain other parties who are former members, managers, securityholders, directors, limited partners, general partners, officers or controlling persons of our predecessor in such capacities.

Excluded Properties and Businesses

The Malkin Group, including Anthony E. Malkin, our Chairman and Chief Executive Officer, owns non-controlling interests in, and Anthony E. Malkin and Peter L. Malkin control the general partners or managers of, the entities that own interests in eight multi-family properties, five net leased retail properties, (including one single tenant retail property in Greenwich, Connecticut), and a parcel that is being developed for residential use. The Malkin Group also owns non-controlling interests in one Manhattan office property, two Manhattan retail properties and several retail properties outside of Manhattan, none of which were contributed to us in the formation transactions. We refer to the non-controlling interests described above collectively as the excluded properties. In addition, the Malkin Group owns interests in two mezzanine and senior equity funds, an industrial fund, and five residential properties, and which we refer to collectively as the excluded businesses. Other than the Greenwich retail property, we do not believe that the excluded properties or the excluded businesses are consistent with our portfolio geographic or property type composition, management or strategic direction.

F-33

Pursuant to management and/or service agreements with the owners of interests in those excluded properties and services agreements with five residential property managers and the managers of certain other excluded businesses which historically were managed by affiliates of our predecessor, we are designated as the asset manager (supervisor) and/or property manager of the excluded properties and will provide services to the owners of certain of the excluded properties and the five residential property managers and provide services and access to office space to the existing managers of the other excluded businesses. As the manager or service provider, we are paid a management or other fee with respect to those excluded properties and excluded businesses where our predecessor had previously received a management fee on the same terms as the fee paid to our predecessor, and reimbursed for our costs in providing the management and other services to those excluded properties and businesses where our predecessor had not previously received a management fee. ESRT's management of the excluded properties and provision of services to the five residential property managers and the existing managers of the other excluded businesses represent a minimal portion of our overall business. There is no established time period in which we will manage such properties or provide services to the owners of certain of the excluded properties and the five residential property managers and provide services and access to office space to the existing managers of the other excluded businesses; and Peter L. Malkin and Anthony E. Malkin expect to sell certain properties or unwind these businesses over time. We are not precluded from acquiring all or certain interests in the excluded properties or businesses. If we were to attempt any such acquisition, we anticipate that Anthony E. Malkin, ESRT's Chairman and Chief Executive Officer, will not participate in the negotiation process on our behalf with respect to our potential acquisition of any of these excluded properties or businesses, and the approval of a majority of ESRT's independent directors will be required to approve any such acquisition.

Services are and were provided by us to excluded properties and businesses. These transactions are reflected in our consolidated statements of income as third-party management and other fees.

We earned asset management (supervisory) and service fees from excluded properties and businesses of $1.1 million, $1.1 million and $1.4 million during the years ended December 31, 2018, 2017 and 2016, respectively.

We earned property management fees from excluded properties of $0.3 million, $0.3 million and $0.4 million during the years ended December 31, 2018, 2017 and 2016, respectively.

Other

We were reimbursed at allocable cost for 647 square feet of shared office space, equipment, and administrative support shared with us in our corporate offices, as was done prior to our formation, and we received rent generally at market rental rate for 3,074 square feet of leased space, from entities affiliated with Anthony E. Malkin at one of our properties. Total revenue aggregated $0.2 million for the year ended December 31, 2016.

During August 2016, such entities moved from the previously shared office and leased spaces to relocate to a new 5,351 square foot leased space at one of our properties, paying rent generally at a market rental rate. Under such new lease, the tenant has the right to cancel such lease without special payment on 90 days’ notice. We now have a shared use agreement with such tenant, to occupy a portion of the leased premises as the office location for Peter L. Malkin, our chairman emeritus and employee, utilizing approximately 15% of the space, for which we pay an allocable pro rata share of the cost to such tenant. We also have agreements with these entities and excluded properties and businesses to provide them with general computer-related support. Total revenue aggregated $0.3 million, $0.4 million and $0.1 million for the years ended December 31, 2018, 2017 and 2016, respectively.

During 2016 and in connection with our office move, Peter L. Malkin purchased miscellaneous furniture and artwork from us at their appraised value of $23,300. Remaining office furniture was disposed.

One of our directors, James D. Robinson IV, is a general partner in an investment fund, which owns more than a 10% economic and voting interest in one of our tenants, OnDeck Capital, with an annualized rent of $4.5 million and $5.8 million as of December 31, 2018 and 2017, respectively.

11. Income Taxes

TRS Holdings and Observatory TRS are taxable entities and their consolidated provision for income taxes consisted of the following for the years ended December 31, 2018, 2017 and 2016 (amounts in thousands):

F-34

	For the Year Ended December 31,
	2018			2017			2016
Current:
Federal	$	(2,389	)	$	(3,923	)	$	(3,632	)
State and local	(2,253		)	(2,304		)	(2,055		)
Total current	(4,642		)	(6,227		)	(5,687		)
Deferred:
Federal	—			(446		)	(291		)
State and local	—			—			(168		)
Total deferred	—			(446		)	(459		)
Income tax expense	$	(4,642	)	$	(6,673	)	$	(6,146	)

In December 2017, the Tax Cuts and Jobs Act (the “TCJA”) was enacted. The TCJA includes a number of changes to existing U.S. tax laws, most notably a reduction of the U.S. corporate income tax rate from 35 percent to 21 percent, effective January 1, 2018. We measure deferred tax assets using enacted tax rates that will apply in the years in which the temporary differences are expected to be recovered or paid. Accordingly, our deferred tax assets were remeasured to reflect the reduction in the U.S. corporate income tax rate, resulting in a $0.4 million increase in income tax expense for the year ended December 31, 2017 and a corresponding decrease of the same amount in our deferred assets as of December 31, 2017.

    The effective income tax rate is 34.0%, 48.5% and 44.8% for the years ended December 31, 2018, 2017 and 2016, respectively. The actual tax provision differed from that computed at the federal statutory corporate rate as follows (amounts in thousands):

	For the Year Ended December 31,
	2018			2017			2016
Federal tax expense at statutory rate	$	(2,844	)	$	(4,684	)	$	(4,629	)
State income taxes, net of federal benefit	(1,798		)	(1,543		)	(1,517		)
Corporate income tax rate adjustment	—			(446		)	—
Income tax expense	$	(4,642	)	$	(6,673	)	$	(6,146	)

The income tax effects of temporary differences that give rise to deferred tax assets are presented below as of December 31, 2018, 2017 and 2016 (amounts in thousands):

	2018		2017		2016
Deferred tax assets:
Deferred revenue on unredeemed observatory admission ticket sales	$	1,396	$	1,395	$	198

Deferred tax assets at December 31, 2018, 2017 and 2016, respectively, are attributable to the inclusion of deferred revenue on Observatory admission ticket sales not redeemed at year-end in determining income for tax reporting purposes and are included in prepaid expenses and other assets on the consolidated balance sheets. No valuation allowance has been recorded against the deferred tax asset because the Company believes that the deferred tax asset will, more likely than not, be realized. This determination is based on the Observatory TRS’s anticipated future taxable income and the reversal of the deferred tax asset.

At December 31, 2018, 2017 and 2016, the TRS entities have no amount of unrecognized tax benefits. For tax years 2018, 2017, 2016 and 2015, the United States federal and state tax returns are open for examination.

F-35

12. 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, repositioning and disposition of our real estate assets. Our observatory segment operates 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 different marketing strategies. We account for intersegment sales and rents as if the sales or rents were to third parties, that is, at current market prices.

The following tables provide components of segment profit for each segment for the years ended December 31, 2018, 2017 and 2016, as reviewed by management (amounts in thousands):

	2018
	Real Estate			Observatory			Intersegment Elimination			Total
Revenues:
Rental revenue	$	493,231		$	—		$	—		$	493,231
Intercompany rental revenue	79,954			—			(79,954		)	—
Tenant expense reimbursement	72,372			—			—			72,372
Observatory revenue	—			131,227			—			131,227
Lease termination fees	20,847			—			—			20,847
Third-party management and other fees	1,440			—			—			1,440
Other revenue and fees	12,394			—			—			12,394
Total revenues	680,238			131,227			(79,954		)	731,511
Operating expenses:
Property operating expenses	167,379			—			—			167,379
Intercompany rent expense	—			79,954			(79,954		)	—
Ground rent expense	9,326			—			—			9,326
General and administrative expenses	52,674			—			—			52,674
Observatory expenses	—			32,767			—			32,767
Real estate taxes	110,000			—			—			110,000
Depreciation and amortization	168,430			78			—			168,508
Total operating expenses	507,809			112,799			(79,954		)	540,654
Total operating income	172,429			18,428			—			190,857
Other income (expense):
Interest income	10,661			—			—			10,661
Interest expense	(79,623		)	—			—			(79,623		)
Income before income taxes	103,467			18,428			—			121,895
Income tax expense	(1,114		)	(3,528		)	—			(4,642		)
Net income	$	102,353		$	14,900		$	—		$	117,253
Segment assets	$	3,930,330		$	265,450		$	—		$	4,195,780
Expenditures for segment assets	$	201,685		$	54,811		$	—		$	256,496

F-36

	2017
	Real Estate			Observatory			Intersegment Elimination			Total
Revenues:
Rental revenue	$	483,944		$	—		$	—		$	483,944
Intercompany rental revenue	77,646			—			(77,646		)	—
Tenant expense reimbursement	73,679			—			—			73,679
Observatory revenue	—			127,118			—			127,118
Lease termination fees	13,551			—			—			13,551
Third-party management and other fees	1,400			—			—			1,400
Other revenue and fees	9,834			—			—			9,834
Total revenues	660,054			127,118			(77,646		)	709,526
Operating expenses:
Property operating expenses	163,531			—			—			163,531
Intercompany rent expense	—			77,646			(77,646		)	—
Ground rent expense	9,326			—			—			9,326
General and administrative expenses	50,315			—			—			50,315
Observatory expenses	—			30,275			—			30,275
Real estate taxes	102,466			—			—			102,466
Depreciation and amortization	160,630			80			—			160,710
Total operating expenses	486,268			108,001			(77,646		)	516,623
Total operating income (loss)	173,786			19,117			—			192,903
Other income (expense):
Interest income	2,942			—			—			2,942
Interest expense	(68,473		)	—			—			(68,473		)
Loss on early extinguishment of debt	(2,157		)	—			—			(2,157		)
Loss from derivative financial instrument	(289		)	—			—			(289		)
Income before income taxes	105,809			19,117			—			124,926
Income tax expense	(1,306		)	(5,367		)	—			(6,673		)
Net income	$	104,503		$	13,750		$	—		$	118,253
Segment assets	$	3,670,907		$	260,440		$	—		$	3,931,347
Expenditures for segment assets	$	191,541		$	36,621		$	—		$	228,162

F-37

	2016
	Real Estate			Observatory			Intersegment Elimination			Total
Revenues:
Rental revenue	$	460,653		$	—		$	—		$	460,653
Intercompany rental revenue	75,658			—			(75,658		)	—
Tenant expense reimbursement	73,459			—			—			73,459
Observatory revenue	—			124,814			—			124,814
Lease termination fees	7,676			—			—			7,676
Third-party management and other fees	1,766			—			—			1,766
Other revenue and fees	8,970			15			—			8,985
Total revenues	628,182			124,829			(75,658		)	677,353
Operating expenses:
Property operating expenses	153,850			—			—			153,850
Intercompany rent expense	—			75,658			(75,658		)	—
Ground rent expense	9,326			—			—			9,326
General and administrative expenses	49,078			—			—			49,078
Observatory expenses	—			29,833			—			29,833
Real estate taxes	96,061			—			—			96,061
Acquisition expenses	98			—			—			98
Depreciation and amortization	154,817			394			—			155,211
Total operating expenses	463,230			105,885			(75,658		)	493,457
Total operating income (loss)	164,952			18,944			—			183,896
Other income (expense):
Interest income	647			—			—			647
Interest expense	(70,595		)	—			—			(70,595		)
Loss on early extinguishment of debt	(552		)	—			—			(552		)
Income (loss) before income taxes	94,452			18,944			—			113,396
Income tax expense	(1,361		)	(4,785		)	—			(6,146		)
Net income	$	93,091		$	14,159		$	—		$	107,250
Segment assets	$	3,641,844		$	249,109		$	—		$	3,890,953
Expenditures for segment assets	$	197,680		$	—		$	—		$	197,680

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13. Summary of Quarterly Financial Information (unaudited)

The quarterly results of operations of our company for the years ended December 31, 2018, 2017 and 2016 are as follows (amounts in thousands):

	March 31, 2018		June 30, 2018		September 30, 2018		December 31, 2018
Revenues	$	167,271	$	178,529	$	186,402	$	199,309
Operating income	$	34,164	$	49,665	$	48,538	$	58,490
Net income	$	18,058	$	30,184	$	29,230	$	39,781
Net income attributable to common unitholders	$	17,824	$	29,950	$	28,996	$	39,547
Net income per share attributable to common unitholders:
Basic and diluted	$	0.06	$	0.10	$	0.10	$	0.13
	March 31, 2017		June 30, 2017		September 30, 2017		December 31, 2017
Revenues	$	164,333	$	176,349	$	186,547	$	182,297
Operating income	$	36,045	$	50,659	$	56,008	$	50,191
Net income	$	19,145	$	31,359	$	35,489	$	32,260
Net income attributable to common unitholders	$	18,911	$	31,125	$	35,255	$	32,026
Net income per share attributable to common unitholders:
Basic and diluted	$	0.06	$	0.10	$	0.12	$	0.11
	March 31, 2016		June 30, 2016		September 30, 2016		December 31, 2016
Revenues	$	157,057	$	165,785	$	175,704	$	178,807
Operating income	$	34,097	$	44,162	$	53,442	$	52,195
Net income	$	16,705	$	24,640	$	32,897	$	33,008
Net income attributable to common unitholders	$	16,471	$	24,406	$	32,663	$	32,774
Net income per share attributable to common unitholders:
Basic and diluted	$	0.06	$	0.09	$	0.12	$	0.11

14. Subsequent Events

None.

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Empire State Realty OP, L.P.

Schedule II—Valuation and Qualifying Accounts

(amounts in thousands)

Description	Balance At Beginning of Year		Additions Charged Against Operations			Uncollectible Accounts Written-Off			Balance at End of Year
Year ended December 31, 2018
Allowance for doubtful accounts	$	1,607	$	(811	)	$	(289	)	$	507
Year ended December 31, 2017
Allowance for doubtful accounts	$	3,723	$	(1,650	)	$	(466	)	$	1,607
Year ended December 31, 2016
Allowance for doubtful accounts	$	3,037	$	908		$	(222	)	$	3,723

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Empire State Realty OP, L.P.

Schedule III—Real Estate and Accumulated Depreciation

(amounts in thousands)

				Initial Cost to the Company				Cost Capitalized Subsequent to Acquisition				Gross Amount at which Carried at 12/31/18
Development	Type	Encumbrances		Land		Building & Improvements		Improvements		Carrying Costs		Land		Buildings & Improvements		Total		Accumulated Depreciation			Date of Construction	Date Acquired	Life on which depreciation in latest income statement is computed
111 West 33rd Street, New York, NY	office / retail	$	—	$	13,630	$	244,461	$	106,780	n/a		$	13,630	$	351,241	$	364,871	$	(41,629	)	1954	2014	various
1400 Broadway, New York, NY	office / retail	—		—		96,338		40,261		—		—		136,599		136,599		(31,601		)	1930	2014	various
1333 Broadway, New York, NY	office / retail	158,484		91,435		120,190		7,491		n/a		91,435		127,681		219,116		(22,331		)	1915	2013	various
1350 Broadway, New York, NY	office / retail	—		—		102,518		27,161		—		—		129,679		129,679		(25,312		)	1929	2013	various
250 West 57th Street, New York, NY	office/ retail	—		2,117		5,041		141,581		n/a		2,117		146,622		148,739		(36,058		)	1921	1953	various
501 Seventh Avenue, New York, NY	office/ retail	—		1,100		2,600		94,778		n/a		1,100		97,378		98,478		(43,164		)	1923	1950	various
1359 Broadway, New York, NY	office/ retail	—		1,233		1,809		57,938		n/a		1,233		59,747		60,980		(26,549		)	1924	1953	various
350 Fifth Avenue (Empire State Building), New York, NY	office/ retail	—		21,551		38,934		895,989		n/a		21,551		934,923		956,474		(211,068		)	1930	2013	various
One Grand Central Place, New York, NY	office/ retail	—		7,240		17,490		241,218		n/a		7,222		258,726		265,948		(109,502		)	1930	1954	various
First Stamford Place, Stamford, CT	office	178,616		22,952		122,739		63,292		n/a		24,862		184,121		208,983		(78,570		)	1986	2001	various
One Station Place, Stamford, CT (Metro Center)	office	91,592		5,313		28,602		15,301		n/a		5,313		43,903		49,216		(30,763		)	1987	1984	various
383 Main Avenue, Norwalk, CT	office	29,614		2,262		12,820		22,253		n/a		2,262		35,073		37,335		(12,876		)	1985	1994	various
500 Mamaroneck Avenue, Harrison, NY	office	—		4,571		25,915		22,198		n/a		4,571		48,113		52,684		(23,147		)	1987	1999	various
10 Bank Street, White Plains, NY	office	33,316		5,612		31,803		18,412		n/a		5,612		50,215		55,827		(21,134		)	1989	1999	various
10 Union Square, New York, NY	retail	49,116		5,003		12,866		1,966		n/a		5,003		14,832		19,835		(7,801		)	1987	1996	various
1542 Third Avenue, New York, NY	retail	29,459		2,239		15,266		425		n/a		2,239		15,691		17,930		(7,774		)	1991	1999	various
1010 Third Avenue, New York, NY and 77 West 55th Street, New York, NY	retail	38,370		4,462		15,817		783		n/a		4,462		16,600		21,062		(8,590		)	1962	1998	various
69-97 Main Street, Westport, CT	retail	—		2,782		15,766		1,046		n/a		2,782		16,812		19,594		(7,113		)	1922	2003	various
103-107 Main Street, Westport, CT	retail	—		1,243		7,043		321		n/a		1,260		7,347		8,607		(2,322		)	1900	2006	various
Property for development at the Transportation Hub in Stamford, CT	land	—		4,542		—		7,987		—		12,529		—		12,529		—			n/a	n/a	n/a
Totals		$	608,567	$	199,287	$	918,018	$	1,767,181	$	—	$	209,183	$	2,675,303	$	2,884,486	$	(747,304	)

F-41

Empire State Realty OP, L.P.

Notes to Schedule III—Real Estate and Accumulated Depreciation

(amounts in thousands)

1. Reconciliation of Investment Properties

The changes in our investment properties for the years ended December 31, 2018, 2017 and 2016 are as follows:

	2018			2017			2016
Balance, beginning of year	$	2,667,655		$	2,458,629		$	2,276,330
Acquisition of new properties	—			—			—
Improvements	256,496			228,162			197,680
Disposals	(39,665		)	(19,136		)	(15,381		)
Balance, end of year	$	2,884,486		$	2,667,655		$	2,458,629

The unaudited aggregate cost of investment properties for federal income tax purposes as of December 31, 2018 was $2.5 billion.

2. Reconciliation of Accumulated Depreciation

The changes in our accumulated depreciation for the years ended December 31, 2018, 2017 and 2016 are as follows:

	2018			2017			2016
Balance, beginning of year	$	656,900		$	556,546		$	465,584
Depreciation expense	130,069			119,490			106,343
Disposals	(39,665		)	(19,136		)	(15,381		)
Balance, end of year	$	747,304		$	656,900		$	556,546

Depreciation of investment properties reflected in the combined statements of income is calculated over the estimated original lives of the assets as follows:

Buildings	39 years
Building improvements	39 years or useful life
Tenant improvements	Term of related lease

F-42

EX-21.1

LIST OF SUBSIDIARIES OF EMPIRE STATE REALTY TRUST, INC.

List of subsidiaries of Empire State Realty Trust, Inc.*

Empire State Realty OP, L.P.

ESRT 10 BK St., L.L.C.

ESRT 10 Union Square, L.L.C.

ESRT 103-107 Main St., L.L.C.

ESRT 112 West 34th Street GP, L.L.C.

ESRT 112 West 34th Street, L.P.

ESRT 1333 Broadway, L.L.C.

ESRT 1350 Broadway, L.L.C.

ESRT 1359 Broadway, L.L.C.

ESRT 1400 Broadway GP, L.L.C.

ESRT 1400 Broadway, L.P.

ESRT 1542 Third Avenue, L.L.C.

ESRT 250 West 57th St., L.L.C.

ESRT 500 Mamaroneck Avenue, L.L.C.

ESRT 501 Seventh Avenue, L.L.C.

ESRT 69-97 Main St., L.L.C.

ESRT Captive Insurance Company, L.L.C.

ESRT Cleaning TRS, L.L.C.

ESRT Dining and Fitness TRS, L.L.C.

ESRT East West Manhattan Retail, L.L.C.

ESRT Empire State Building G-Parent, L.L.C.

ESRT Empire State Building Parent, L.L.C.

ESRT Empire State Building, L.L.C.

ESRT ESB Fitness TRS, L.L.C.

ESRT ESB Restaurant TRS, L.L.C.

ESRT First Stamford Place Investor, L.L.C.

ESRT First Stamford Place SPE, L.L.C.

ESRT Holdings TRS, L.L.C.

ESRT Management TRS, L.L.C.

ESRT Management, L.L.C.

ESRT MerrittView, L.L.C.

ESRT Metro Center, L.L.C.

ESRT Metro Tower, L.L.C.

ESRT Observatory TRS, L.L.C.

ESRT One Grand Central Place G-Parent, L.L.C.

ESRT One Grand Central Place Parent, L.L.C.

ESRT One Grand Central Place, L.L.C.

ESRT Springing Member One, L.L.C.

ESRT Springing Member Two, L.L.C.

*This list may omit subsidiaries which, considered in the aggregate, would not constitute a significant subsidiary.

EX-23.1

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the Registration Statement (Form S-3 No. 333-219658) of Empire State Realty Trust, Inc. and Empire State Realty OP, L.P. and in the related Prospectus of our reports, dated February 28, 2019, with respect to the consolidated financial statements and schedules of Empire State Realty OP, L.P. and the effectiveness of internal control over financial reporting of Empire State Realty OP, L.P. included in this Annual Report (Form 10-K) of Empire State Realty OP, L.P. for the year ended December 31, 2018.

/s/ Ernst & Young LLP

New York, New York

February 28, 2019

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 Annual Report on Form 10-K 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: February 28, 2019	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 Annual Report on Form 10-K 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: February 28, 2019	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 Annual Report on Form 10-K for the year ended December 31, 2018 (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: February 28, 2019	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 Annual Report on Form 10-K for the year ended December 31, 2018 (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: February 28, 2019	By:/s/ David A. Karp
	David A. Karp
	Executive Vice President and Chief Financial Officer

XML

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 22, 2019	Jun. 30, 2018
Entity Registrant Name	Empire State Realty OP, L.P.
Entity Central Index Key	0001553079
Document Type	10-K
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Public Float			$ 0
Series ES Operating Partnership Units Limited Partners
Entity Common Stock, Shares Outstanding		29,238,349
Series 60 Operating Partnership Units Limited Partners
Entity Common Stock, Shares Outstanding		7,944,584
Series 250 Operating Partnership Units Limited Partners
Entity Common Stock, Shares Outstanding		3,993,052

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Commercial real estate properties, at cost:
Land	$ 201,196	$ 201,196
Development costs	7,987	7,986
Building and improvements	2,675,303	2,458,473
Commercial real estate properties, at cost, gross	2,884,486	2,667,655
Less: accumulated depreciation	(747,304)	(656,900)
Commercial real estate properties, net	2,137,182	2,010,755
Cash and cash equivalents	204,981	464,344
Restricted cash	65,832	65,853
Short-term Investments	400,000	0
Tenant and other receivables, net of allowance of $488 and $1,422 in 2018 and 2017, respectively	29,437	28,329
Deferred rent receivables, net of allowance of $19 and $185 in 2018 and 2017, respectively	200,903	178,629
Prepaid expenses and other assets	64,345	61,028
Deferred costs, net	241,223	262,701
Acquired below market ground leases, net	360,398	368,229
Goodwill	491,479	491,479
Total assets	4,195,780	3,931,347
Liabilities:
Mortgage notes payable, net	608,567	717,164
Senior unsecured notes, net	1,046,219	707,895
Unsecured term loan facility, net	264,147	263,662
Unsecured revolving credit facility	0	0
Accounts payable and accrued expenses	130,676	110,849
Acquired below market leases, net	52,450	66,047
Deferred revenue and other liabilities	44,810	40,907
Tenants’ security deposits	57,802	47,086
Total liabilities	2,204,671	1,953,610
Commitments and contingencies
Capital:
Private perpetual preferred units, $16.62 per unit liquidation preference, 1,560,360 issued and outstanding in 2018 and 2017, respectively	8,004	8,004
Total capital	1,991,109	1,977,737
Total liabilities and capital	4,195,780	3,931,347
Series PR Operating Partnership Units
Capital:
ESRT partners' capital (3,033,261 and 3,004,095 general partner operating partnership units and 171,877,365 and 158,472,949 limited partner operating partnership units outstanding at December 31, 2018 and 2017, respectively)	1,238,482	1,168,282
Limited partner operating partnership units	725,108	778,279
Series ES Operating Partnership Units Limited Partners
Capital:
Limited partner operating partnership units	14,399	17,132
Series 60 Operating Partnership Units Limited Partners
Capital:
Limited partner operating partnership units	3,385	3,992
Series 250 Operating Partnership Units Limited Partners
Capital:
Limited partner operating partnership units	$ 1,731	$ 2,048

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Tenant and other receivables allowance	$ 488	$ 1,422
Deferred rent receivables allowance	$ 19	$ 185
Private perpetual preferred units, liquidation preference per share (in dollars 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)	174,900,000
Limited partner operating partnership units, outstanding (in shares)	128,400,000
Series PR Operating Partnership Units
Limited partner operating partnership units, outstanding (in shares)	86,202,638	91,759,741
Series ES Operating Partnership Units Limited Partners
Limited partner operating partnership units, outstanding (in shares)	30,129,556	33,774,678
Series 60 Operating Partnership Units [Member]
Limited partner operating partnership units, outstanding (in shares)	8,019,509	8,987,931
Series 250 Operating Partnership Units Limited Partners
Limited partner operating partnership units, outstanding (in shares)	4,063,737	4,410,093
ESRT | Series PR Operating Partnership Units
General partner operating partnership units, outstanding (in shares)	3,033,261	3,004,095
Limited partner operating partnership units, outstanding (in shares)	171,877,365	158,472,949

XML

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues:
Rental revenue	$ 493,231	$ 483,944	$ 460,653
Tenant expense reimbursement	72,372	73,679	73,459
Observatory revenue	131,227	127,118	124,814
Lease termination fees	20,847	13,551	7,676
Third-party management and other fees	1,440	1,400	1,766
Other revenue and fees	12,394	9,834	8,985
Total revenues	731,511	709,526	677,353
Operating expenses:
Property operating expenses	167,379	163,531	153,850
Ground rent expense	9,326	9,326	9,326
General and administrative expenses	52,674	50,315	49,078
Observatory expenses	32,767	30,275	29,833
Real estate taxes	110,000	102,466	96,061
Acquisition expenses	0	0	98
Depreciation and amortization	168,508	160,710	155,211
Total operating expenses	540,654	516,623	493,457
Total operating income	190,857	192,903	183,896
Other income (expense):
Interest income	10,661	2,942	647
Interest expense	(79,623)	(68,473)	(70,595)
Loss on early extinguishment of debt	0	(2,157)	(552)
Loss from derivative financial instruments	0	(289)	0
Income before income taxes	121,895	124,926	113,396
Income tax expense	(4,642)	(6,673)	(6,146)
Net income	117,253	118,253	107,250
Private perpetual preferred unit distributions	(936)	(936)	(936)
Net income attributable to common unitholders	$ 116,317	$ 117,317	$ 106,314
Total weighted average units:
Basic (in units)	297,258	296,455	276,848
Diluted (in units)	297,259	298,049	277,568
Net income per unit:
Basic net income per unit (in dollars per unit)	$ 0.39	$ 0.39	$ 0.38
Diluted net income per unit (in dollars per unit)	$ 0.39	$ 0.39	$ 0.38

XML

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 117,253	$ 118,253	$ 107,250
Other comprehensive loss:
Unrealized loss on valuation of interest rate swap agreements	(2,721)	(11,658)
Unrealized loss on valuation of interest rate swap agreements			(3,054)
Amount reclassified into interest expense	1,845	1,142
Amount reclassified into interest expense			0
Other comprehensive loss	(876)	(10,516)	(3,054)
Comprehensive income	$ 116,377	$ 107,737	$ 104,196

XML

Consolidated Statements of Capital - USD ($) $ in Thousands	3 Months Ended						12 Months Ended
	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance		$ 1,977,737		$ 1,982,863		$ 1,372,686	$ 1,977,737	$ 1,982,863	$ 1,372,686
Issuance of OP units, net of costs							4,749		611,206
Conversion of operating partnership units to Class A shares and Class B shares to ESRT partner's capital							0	0	0
Equity compensation							18,785	14,100	9,729
Distributions							(126,539)	(126,963)	(114,954)
Net income	$ 39,781	$ 18,058	$ 32,260	$ 19,145	$ 33,008	$ 16,705	117,253	118,253	107,250
Unrealized loss on valuation of interest rate swap agreements									(3,054)
Other comprehensive income (loss)							(876)	(10,516)	(3,054)
Ending balance	$ 1,991,109		$ 1,977,737		$ 1,982,863		$ 1,991,109	$ 1,977,737	$ 1,982,863
General Partner | Series PR Operating Partnership Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)		161,477,000		155,841,000		120,023,000	161,477,000	155,841,000	120,023,000
Beginning balance		$ 1,168,282		$ 1,154,136		$ 524,729	$ 1,168,282	$ 1,154,136	$ 524,729
Issuance of OP units, net (in units)							284,000		29,611,000
Issuance of OP units, net of costs							$ 4,749		$ 611,206
Conversion of operating partnership units to Class A shares and Class B shares to ESRT partner's capital (in units)							13,127,000	5,615,000	6,167,000
Conversion of operating partnership units to Class A shares and Class B shares to ESRT partner's capital							$ 70,779	$ 23,435	$ 23,678
Equity compensation (in units)							24,000	21,000	40,000
Equity compensation							$ 417	$ 468	$ 357
Distributions							(70,854)	(66,789)	(55,812)
Net income							65,603	62,647	51,456
Unrealized loss on valuation of interest rate swap agreements									$ (1,478)
Other comprehensive income (loss)							$ (494)	$ (5,615)
Ending balance (in units)	174,912,000		161,477,000		155,841,000		174,912,000	161,477,000	155,841,000
Ending balance	$ 1,238,482		$ 1,168,282		$ 1,154,136		$ 1,238,482	$ 1,168,282	$ 1,154,136
Limited Partners | Series PR Operating Partnership Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)		91,760,000		93,075,000		93,863,000	91,760,000	93,075,000	93,863,000
Beginning balance		$ 778,279		$ 793,360		$ 809,901	$ 778,279	$ 793,360	$ 809,901
Conversion of operating partnership units to Class A shares and Class B shares to ESRT partner's capital (in units)							(8,168,000)	(2,611,000)	(2,657,000)
Conversion of operating partnership units to Class A shares and Class B shares to ESRT partner's capital							$ (68,386)	$ (21,997)	$ (22,264)
Equity compensation (in units)							2,610,000	1,296,000	1,869,000
Equity compensation							$ 18,368	$ 13,632	$ 9,372
Distributions							(36,284)	(38,969)	(37,621)
Net income							33,383	35,430	34,977
Unrealized loss on valuation of interest rate swap agreements									$ (1,005)
Other comprehensive income (loss)							$ (252)	$ (3,177)
Ending balance (in units)	86,202,000		91,760,000		93,075,000		86,202,000	91,760,000	93,075,000
Ending balance	$ 725,108		$ 778,279		$ 793,360		$ 725,108	$ 778,279	$ 793,360
Limited Partners | Series ES Operating Partnership Units Limited Partners
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)		33,774,000		35,728,000		38,262,000	33,774,000	35,728,000	38,262,000
Beginning balance		$ 17,132		$ 20,091		$ 22,074	$ 17,132	$ 20,091	$ 22,074
Conversion of operating partnership units to Class A shares and Class B shares to ESRT partner's capital (in units)							(3,645,000)	(1,954,000)	(2,534,000)
Conversion of operating partnership units to Class A shares and Class B shares to ESRT partner's capital							$ (1,809)	$ (978)	$ (1,075)
Distributions							(13,161)	(14,477)	(14,642)
Net income							12,330	13,726	14,140
Unrealized loss on valuation of interest rate swap agreements									$ (406)
Other comprehensive income (loss)							$ (93)	$ (1,230)
Ending balance (in units)	30,129,000		33,774,000		35,728,000		30,129,000	33,774,000	35,728,000
Ending balance	$ 14,399		$ 17,132		$ 20,091		$ 14,399	$ 17,132	$ 20,091
Limited Partners | Series 60 Operating Partnership Units Limited Partners
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)		8,988,000		9,701,000		10,318,000	8,988,000	9,701,000	10,318,000
Beginning balance		$ 3,992		$ 4,880		$ 5,366	$ 3,992	$ 4,880	$ 5,366
Conversion of operating partnership units to Class A shares and Class B shares to ESRT partner's capital (in units)							(968,000)	(713,000)	(617,000)
Conversion of operating partnership units to Class A shares and Class B shares to ESRT partner's capital							$ (423)	$ (310)	$ (218)
Distributions							(3,532)	(3,889)	(3,985)
Net income							3,373	3,637	3,827
Unrealized loss on valuation of interest rate swap agreements									$ (110)
Other comprehensive income (loss)							$ (25)	$ (326)
Ending balance (in units)	8,020,000		8,988,000		9,701,000		8,020,000	8,988,000	9,701,000
Ending balance	$ 3,385		$ 3,992		$ 4,880		$ 3,385	$ 3,992	$ 4,880
Limited Partners | Series 250 Operating Partnership Units Limited Partners
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)		4,410,000		4,747,000		5,106,000	4,410,000	4,747,000	5,106,000
Beginning balance		$ 2,048		$ 2,392		$ 2,612	$ 2,048	$ 2,392	$ 2,612
Conversion of operating partnership units to Class A shares and Class B shares to ESRT partner's capital (in units)							(346,000)	(337,000)	(359,000)
Conversion of operating partnership units to Class A shares and Class B shares to ESRT partner's capital							$ (161)	$ (150)	$ (121)
Distributions							(1,772)	(1,903)	(1,958)
Net income							1,628	1,877	1,914
Unrealized loss on valuation of interest rate swap agreements									$ (55)
Other comprehensive income (loss)							$ (12)	$ (168)
Ending balance (in units)	4,064,000		4,410,000		4,747,000		4,064,000	4,410,000	4,747,000
Ending balance	$ 1,731		$ 2,048		$ 2,392		$ 1,731	$ 2,048	$ 2,392
Private Perpetual Preferred Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)		1,560,000		1,560,000		1,560,000	1,560,000	1,560,000	1,560,000
Beginning balance		$ 8,004		$ 8,004		$ 8,004	$ 8,004	$ 8,004	$ 8,004
Distributions							(936)	(936)	(936)
Net income							$ 936	$ 936	$ 936
Ending balance (in units)	1,560,000		1,560,000		1,560,000		1,560,000	1,560,000	1,560,000
Ending balance	$ 8,004		$ 8,004		$ 8,004		$ 8,004	$ 8,004	$ 8,004

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows From Operating Activities
Net income	$ 117,253	$ 118,253	$ 107,250
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	168,508	160,710	155,211
Amortization of non-cash items within interest expense	7,215	1,039	739
Amortization of acquired above and below-market leases, net	(6,120)	(5,721)	(8,795)
Amortization of acquired below-market ground leases	7,831	7,831	7,831
Straight-lining of rental revenue	(22,107)	(26,544)	(30,147)
Equity based compensation	18,785	14,100	9,729
Settlement of derivative contracts	0	(15,695)	0
Loss on early extinguishment of debt	0	2,157	552
Increase (decrease) in cash flows due to changes in operating assets and liabilities:
Security deposits	10,717	(97)	(1,707)
Tenant and other receivables	(1,275)	(5,787)	(3,760)
Deferred leasing costs	(26,899)	(31,743)	(22,622)
Prepaid expenses and other assets	(781)	(7,893)	(3,289)
Accounts payable and accrued expenses	1,993	(25,103)	2,939
Deferred revenue and other liabilities	3,902	8,695	824
Net cash provided by operating activities	279,022	194,202	214,755
Cash Flows From Investing Activities
Short-term investments	(400,000)	0	0
Additions to building and improvements	(243,022)	(222,979)	(181,923)
Development costs	(1)	(34)	(453)
Net cash used in investing activities	(643,023)	(223,013)	(182,376)
Cash Flows From Financing Activities
Proceeds from unsecured revolving credit facility	0	0	50,000
Repayments of unsecured revolving credit facility	0	0	(90,000)
Proceeds from mortgage notes payable	160,000	315,000	50,000
Repayment of mortgage notes payable	(266,613)	(346,615)	(32,305)
Proceeds from senior unsecured notes	335,000	115,000	0
Repayment of unsecured term loan	0	(265,000)	0
Proceeds from unsecured revolving credit and term loan facility	0	265,000	0
Deferred financing costs	(1,980)	(13,299)	(3,006)
Net proceeds from the issuance of operating partnership units	4,749	0	611,206
Private perpetual preferred unit distributions	(936)	(936)	(936)
Distributions	(125,603)	(126,027)	(114,018)
Net cash provided by (used in) financing activities	104,617	(56,877)	470,941
Net (decrease) in cash and cash equivalents and restricted cash	(259,384)	(85,688)	503,320
Cash and cash equivalents and restricted cash—beginning of period	530,197	615,885	112,565
Cash and cash equivalents and restricted cash—end of period	270,813	530,197	615,885
Reconciliation of Cash and Cash Equivalents and Restricted Cash:
Cash and cash equivalents at beginning of period	464,344	554,371	46,685
Restricted cash at beginning of period	65,853	61,514	65,880
Cash and cash equivalents at end of period	204,981	464,344	554,371
Restricted cash at end of period	65,832	65,853	61,514
Cash and cash equivalents and restricted cash	530,197	615,885	112,565
Supplemental disclosures of cash flow information:
Cash paid for interest	74,160	66,911	69,062
Interest capitalized	1,596	459	0
Cash paid for income taxes	4,847	5,783	6,238
Non-cash investing and financing activities:
Building and improvements included in accounts payable and accrued expenses	85,242	71,769	66,620
Write-off of fully depreciated assets	39,665	19,136	15,381
Conversion of operating partnership units and Class B shares to Class A shares	$ 70,779	$ 23,435	$ 23,678

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Description of Business and Organization

12 Months Ended

Dec. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Description of Business and Organization

Description of Business and Organization

As used in these 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. Empire State Realty Trust, Inc.'s Class A common stock, par value $0.01 per share, is listed on the New York Stock Exchange under the symbol "ESRT." We were organized as a Delaware limited partnership on November 28, 2011.

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 December 31, 2018, ESRT owned approximately 57.7% of our operating partnership units.

As of December 31, 2018, 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 interest) encompassing approximately 9.4 million rentable square feet of office space. Nine of these properties are located in the midtown Manhattan market and encompass in the 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 513,606 rentable square feet of premier retail space on their ground floor and/or lower levels. Our remaining five office properties are located in Fairfield County, Connecticut and Westchester County, New York, encompassing in the aggregate approximately 1.8 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 December 31, 2018, our portfolio also included four standalone retail properties located in Manhattan and two standalone retail properties located in the city center of Westport, Connecticut, encompassing 205,748 rentable square feet in the aggregate.

We have two entities that elected, together with ESRT, to be treated as taxable REIT subsidiaries, or TRSs, of ESRT. The TRSs, through several wholly owned limited liability companies, conduct third-party services businesses, which include the Empire State Building Observatory, cleaning services, cafeteria, restaurant and health clubs, and asset and property management services.

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Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

Basis of Presentation and Principles of Consolidation

The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and with the rules and regulations of the Securities and Exchange Commission (the "SEC") represent our assets and liabilities and operating results. The consolidated financial statements include our accounts and our wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.

    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 December 31, 2018 and 2017.

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 consolidated balance sheets and in the 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 consolidated financial statements in accordance with GAAP requires management to use estimates and assumptions that in certain circumstances affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities, and the reported revenues and expenses. Significant items subject to such estimates and assumptions include allocation of the purchase price of acquired real estate properties among tangible and intangible assets, determination of the useful life of real estate properties and other long-lived assets, valuation and impairment analysis of commercial real estate properties and other long-lived assets, estimate of tenant expense reimbursements, 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 notes, unsecured revolving credit and term loan 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.

Revenue Recognition

Rental Revenue

Rental revenue includes base rents that each tenant pays in accordance with the terms of its respective lease and is reported on a straight-line basis over the non-cancellable term of the lease which includes the effects of rent steps and rent abatements under the leases. In general, we commence rental revenue recognition when the tenant takes possession of the leased space or controls the physical use of the leased space and the leased space is substantially ready for its intended use. We account for all of our leases as operating leases. Deferred rent receivables, including free rental periods and leasing arrangements allowing for increased base rent payments, are accounted for in a manner that provides an even amount of fixed lease revenues over the respective non-cancellable lease terms. Differences between rental income recognized and amounts due under the respective lease agreements are recognized as an increase or decrease to deferred rent receivables.

In addition to base rent, our tenants also generally will pay their pro rata share of increases in real estate taxes and operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in building operating expenses, the tenant will pay additional rent based upon increases in an index such as the Consumer Price Index over the index value in effect during a base year, or contain fixed percentage increases over the base rent to cover escalations.

We will recognize rental revenue of acquired in-place above- and below-market leases at their fair values over the terms of the respective leases, including, for below-market leases, fixed option renewal periods, if any.

Lease termination fees are recognized when the fees are determinable, tenant vacancy has occurred, collectability is reasonably assured, we have no continuing obligation to provide services to such former tenants and the payment is not subject to any conditions that must be met or waived.

Observatory Revenue

Revenues from the sale of Observatory tickets are recognized upon admission or ticket expirations. Deferred revenue related to unused and unexpired tickets as of December 31, 2018 and 2017 was $4.1 million and $4.1 million, respectively, and is included in deferred revenue and other liabilities on the consolidated balance sheets.

Gains on Sale of Real Estate

We record a gain on sale of real estate when title is conveyed to the buyer and we have no substantial economic involvement with the property. If the sales criteria for the full accrual method are not met, we defer some or all of the gain recognition and account for the continued operations of the property by applying the finance, leasing, profit sharing, deposit, installment or cost recovery methods, as appropriate, until the sales criteria are met.

Third-Party Management and Other Fees

We earn revenue arising from contractual agreements with related party entities for asset and property management services. This revenue is recognized as the related services are performed under the respective agreements in place.

Other Revenues and Fees

Other revenues and fees includes parking income, percentage rent, legal, tax and insurance settlements, demand response energy use earnings and sales from our restaurant at the Empire State Building.

Advertising and Marketing Costs

Advertising and marketing costs are expensed as incurred. The expense for the years ended December 31, 2018, 2017, and 2016 was $8.9 million, $7.6 million and $9.4 million, respectively, and is included within operating expenses in our consolidated statements of income.

Real Estate Properties and Related Intangible Assets

Land and buildings and improvements are recorded at cost less accumulated depreciation and amortization. The recorded cost includes cost of acquisitions, development and construction and tenant allowances and improvements. Expenditures for ordinary repairs and maintenance are charged to property operating expense as incurred. Significant replacements and betterments which improve or extend the life of the asset are capitalized. Tenant improvements which improve or extend the life of the asset are capitalized. If a tenant vacates its space prior to the contractual termination of its lease, the unamortized balance of any tenant improvements are written off if they are replaced or have no future value. For developed properties, direct and indirect costs that clearly relate to projects under development are capitalized. Costs include construction costs, professional services such as architectural and legal costs, capitalized interest and direct payroll costs. We begin capitalization when the project is probable. The assets relating to the project are stated at cost and are not depreciated. Once construction is completed and the assets are placed in service, the assets are reclassified to the appropriate asset class and depreciated in accordance with the useful lives as indicated below. Capitalization of interest ceases when the asset is ready for its intended use, which is generally near the date that a certificate of occupancy is obtained. Total capitalized interest for the years ended December 31, 2018 and 2017 was $1.6 million and $0.5 million, respectively. There was no capitalized interest for the year ended December 31, 2016.

Depreciation and amortization are computed using the straight-line method for financial reporting purposes. Buildings and improvements are depreciated over the shorter of 39 years, the useful life, or the remaining term of any leasehold interest. Tenant improvement costs, which are included in building and improvements in the consolidated balance sheets, are depreciated over the shorter of (i) the related remaining lease term or (ii) the life of the improvement. Corporate equipment, which is included in “Other assets,” is depreciated over three to seven years.

Acquisitions of properties are accounted for utilizing the acquisition method and accordingly the purchase cost is allocated to tangible and intangible assets and liabilities based on their fair values. The fair value of tangible assets acquired is determined by valuing the property as if it were vacant, applying methods similar to those used by independent appraisers of income-producing property. The resulting value is then allocated to land, buildings and improvements, and tenant improvements based on our determination of the fair value of these assets. The assumptions used in the allocation of fair values to assets acquired are based on our best estimates at the time of evaluation.

Fair value is assigned to above-market and below-market leases based on the difference between (a) the contractual amounts to be paid by the tenant based on the existing lease and (b) our estimate of current market lease rates for the corresponding in-place leases, over the remaining terms of the in-place leases. Capitalized above-market lease amounts are amortized as a decrease to rental revenue over the remaining terms of the respective leases. Capitalized below-market lease amounts are amortized as an increase to rental revenue over the remaining terms of the respective leases. If a tenant vacates its space prior to the contractual termination of the lease and no rental payments are being made on the lease, any unamortized balance of the related intangible will be written off.

The aggregate value of other acquired intangible assets consists of acquired ground leases and acquired in-place leases and tenant relationships. The fair value allocated to acquired in-place leases consists of a variety of components including, but not necessarily limited to: (a) the value associated with avoiding the cost of originating the acquired in-place leases (i.e. the market cost to execute a lease, including leasing commissions and legal fees, if any); (b) the value associated with lost revenue related to tenant reimbursable operating costs estimated to be incurred during the assumed lease-up period (i.e. real estate taxes, insurance and other operating expenses); (c) the value associated with lost rental revenue from existing leases during the assumed lease-up period; and (d) the value associated with any other inducements to secure a tenant lease.

We assess the potential for impairment of our long-lived assets, including real estate properties, annually or whenever events occur or a change in circumstances indicate that the recorded value might not be fully recoverable. We determine whether impairment in value has occurred by comparing the estimated future undiscounted cash flows expected from the use and eventual disposition of the asset to its carrying value. If the undiscounted cash flows do not exceed the carrying value, the real estate is adjusted to fair value and an impairment loss is recognized. Assets held for sale are recorded at the lower of cost or fair value less costs to sell. We do not believe that the value of any of our properties and intangible assets were impaired during the years ended December 31, 2018, 2017 and 2016.

Cash and Cash Equivalents

Cash and cash equivalents consist of cash on hand, government money markets, demand deposits with financial institutions and short-term liquid investments with original maturities of three months or less when purchased. Cash and cash equivalents held at major commercial banks may at times exceed the Federal Deposit Insurance Corporation limit. To date, we have not experienced any losses on our invested cash.

Restricted Cash

Restricted cash consists of amounts held for tenants in accordance with lease agreements such as security deposits and amounts held by lenders and/or escrow agents to provide for future real estate tax expenditures and insurance expenditures, tenant vacancy related costs and debt service obligations.

Short-term Investments

Short-term investments include time deposits with original maturities of greater than three months and remaining

maturities of less than one year.

Tenant and Other Receivables

Tenant and other receivables, other than deferred rent receivable, are generally expected to be collected within one year.

Allowance for Doubtful Accounts

We maintain an allowance against tenant and other receivables and deferred rents receivables for future potential tenant credit losses. The credit assessment is based on the estimated accrued rental revenue that is recoverable over the term of the respective lease. The computation of this allowance is based on the tenants’ payment history and current credit status. If our estimate of collectability differs from the cash received, then the timing and amount of our reported revenue could be impacted. Bad debt expense is included in operating expenses on our consolidated statements of income and includes the impact of changes in the allowance for doubtful accounts on our consolidated balance sheets.

Deferred Leasing Costs

Deferred leasing costs consist of fees and direct costs incurred to initiate and renew leases, are amortized on a straight-line basis over the related lease term and the expense is included in depreciation and amortization in our consolidated statements of income. Upon the early termination of a lease, unamortized deferred leasing costs are charged to expense.

Deferred Financing Costs

Fees and costs incurred to obtain long-term financing have been deferred and are amortized as a component of interest expense in our consolidated statements of income over the life of the respective long-term financing on the straight-line method which approximates the effective interest method. Unamortized deferred financing costs are expensed when the associated debt is refinanced or repaid before maturity. Costs incurred in seeking debt, which do not close, are expensed in the period in which it is determined that the financing will not close.

Equity Method Investments

We account for investments under the equity method of accounting where we do not have control but have the ability to exercise significant influence. Under this method, investments are recorded at cost, and the investment accounts are adjusted for our share of the entities’ income or loss and for distributions and contributions. Equity income (loss) is allocated based on the portion of the ownership interest that is controlled by us. The agreements may designate different percentage allocations among investors for profits and losses; however, our recognition of the entity’s income or loss generally follows the entity’s distribution priorities, which may change upon the achievement of certain investment return thresholds.

To the extent that we contributed assets to an entity, our investment in the entity is recorded at cost basis in the assets that were contributed to the entity. Upon contributing assets to an entity, we make a judgment as to whether the economic substance of the transaction is a sale. If so, gain or loss is recognized on the portion of the asset to which the other partners in the entity obtain an interest.

To the extent that the carrying amount of these investments on our combined balance sheets is different than the basis reflected at the entity level, the basis difference would be amortized over the life of the related asset and included in our share of equity in net income of the entity.

On a periodic basis, we assess whether there are any indicators that the carrying value of our investments in entities may be impaired on an other than temporary basis. An investment is impaired only if management’s estimate of the fair value of the investment is less than the carrying value of the investment on an other than temporary basis. To the extent impairment has occurred, the loss shall be measured as the excess of the carrying value of the investment over the fair value of the investment.

As of December 31, 2018 and 2017, we had no equity method investments.

Goodwill

Goodwill is tested annually for impairment and is tested for impairment more frequently if events and circumstances indicate that the asset might be impaired. An impairment loss is recognized to the extent that the carrying amount, including goodwill, exceeds the reporting unit’s fair value and the implied fair value of goodwill is less than the carrying amount of that goodwill. Non-amortizing intangible assets, such as trade names and trademarks, are subject to an annual impairment test based on fair value and amortizing intangible assets are tested whenever events or changes in circumstances indicate that the carrying amount may not be recoverable.

Fair Value

Fair value is a market-based measurement, not an entity-specific measurement, and should be determined based on the assumptions that market participants would use in pricing the asset or liability. As a basis for considering market participant assumptions in fair value measurements, the Financial Accounting Standards Board ("FASB") guidance establishes a fair value hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity (observable inputs that are classified within levels one and two of the hierarchy) and the reporting entity's own assumptions about market participant assumptions (unobservable inputs classified within Level 3 of the hierarchy).

The methodologies used for valuing financial instruments have been categorized into three broad levels as follows:

Level 1 - Quoted prices in active markets for identical instruments.

Level 2 - Valuations based principally on other observable market parameters, including:

• Quoted prices in active markets for similar instruments;

• Quoted prices in less active or inactive markets for identical or similar instruments;

• Other observable inputs (such as risk free interest rates, yield curves, volatilities, prepayment speeds, loss severities, credit risks and default rates); and

• Market corroborated inputs (derived principally from or corroborated by observable market data).

Level 3 - Valuations based significantly on unobservable inputs, including:

• Valuations based on third-party indications (broker quotes or counterparty quotes) which were, in turn, based significantly on unobservable inputs or were otherwise not supportable; and

• Valuations based on internal models with significant unobservable inputs.

These levels form a hierarchy. We follow this hierarchy for our financial instruments measured or disclosed at fair value on a recurring and nonrecurring basis and other required fair value disclosures. The classifications are based on the lowest level of input that is significant to the fair value measurement.

We use the following methods and assumptions in estimating fair value disclosures for financial instruments.

Cash and cash equivalents, restricted cash, short term investments, tenant and other receivables, prepaid expenses and other assets, deferred revenue, tenant security deposits, accounts payable and accrued expenses carrying values approximate their fair values due to the short term maturity of these instruments.

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

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

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

Derivative Instruments

We are exposed to the effect of interest rate changes and manage these risks by following policies and procedures including the use of derivatives. To manage exposure to interest rates, derivatives are used primarily to fix the rate on debt based on floating-rate indices. We also hedge exposure to the variability in future cash flows for forecast transactions over a maximum period of 11 months (excluding forecast transactions related to the payment of variable interest on existing financial instruments). We record all derivatives on the balance sheet at fair value. We incorporate credit valuation adjustments to appropriately reflect both our own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. We measure the credit risk of our derivative instruments that are subject to master netting agreements on a net basis by counterparty portfolio. For derivatives that qualify as cash flow hedges, we report the gain or loss on the derivative designated as a hedge as part of other comprehensive income (loss) and subsequently reclassify the gain or loss into income in the period that the hedged transaction affects income.

Income Taxes

We are generally not subject to federal and state income taxes as our taxable income or loss is reportable by our partners. Accordingly, no provision has been made for federal and state income taxes. ESRT has elected, together with ESRT Observatory TRS, L.L.C., our subsidiary which holds our observatory operations, to treat ESRT Observatory TRS, L.L.C. as a TRS. ESRT has elected, together with ESRT Holdings TRS, L.L.C., our subsidiary that holds our third party management, restaurant, cafeteria, health clubs and certain cleaning operations, to treat ESRT Holdings TRS, L.L.C. as a TRS. TRSs may participate in non-real estate activities and/or perform non-customary services for tenants and their operations are generally subject to regular corporate income taxes. Our TRSs account for their income taxes in accordance with GAAP, which includes an estimate of the amount of taxes payable or refundable for the current year and deferred tax liabilities and assets for the future tax consequences of events that have been recognized in our financial statements or tax returns. The calculation of the TRSs' tax provisions may require interpreting tax laws and regulations and could result in the use of judgments or estimates which could cause its recorded tax liability to differ from the actual amount due. Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. The TRSs periodically assess the realizability of deferred tax assets and the adequacy of deferred tax liabilities, including the results of local, state, or federal statutory tax audits or estimates and judgments used.

We apply provisions for measuring and recognizing tax benefits associated with uncertain income tax positions. Penalties and interest, if incurred, would be recorded as a component of income tax expense. As of December 31, 2018 and 2017, we do not have a liability for uncertain tax positions. As of December 31, 2018, the tax years ended December 31, 2015 through December 31, 2018 remain open for an audit by the Internal Revenue Service, state or local authorities.

Share-Based Compensation

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. The determination of fair value of these awards is subjective and involves significant estimates and assumptions including expected volatility of ESRT stock, expected dividend yield, expected term, and assumptions of whether these awards will achieve parity with other operating partnership units or achieve performance thresholds. We believe that the assumptions and estimates utilized are appropriate based on the information available to management at the time of grant.

Per Unit Data

Basic and diluted earnings per unit are computed based upon the weighted average number of shares outstanding during the respective period.

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, repositioning and disposition of our real estate assets. Our observatory segment operates 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 different marketing strategies. We account for intersegment sales and rent as if the sales or rent were to third parties, that is, at current market prices.

Reclassification

Certain prior year balances have been reclassified to conform to our current year presentation. The 2017 and 2016 balance of other revenues and fees has been reclassified to separately present lease termination fees and interest income and conform to our current year presentation.

Recently Issued or Adopted Accounting Standards

During August 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2018-15, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (a consensus of the FASB Emerging Issues Task Force), which contain amendments that align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal use software license). Accordingly, for entities in a hosting arrangement that is a service contract, costs for implementation activities in the application development stage are capitalized depending on the nature of the costs, while costs incurred during the preliminary project and post-implementation stages are expensed as the activities are performed. The amendments in ASU No. 2018-15 also require the entity (customer) to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement. The amendments are effective for public business entities for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption of the amendments is permitted, including adoption in any interim period. The amendments in ASU No. 2018-15 should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

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

During January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business, which contain amendments to clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The amendments in ASU No. 2017-01 provide a screen to determine when an integrated set of assets and activities (collectively referred to as a “set”) is not a business. The screen requires that when substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. This screen reduces the number of transactions that need to be further evaluated. If the screen is not met, the amendments (1) require that to be considered a business, a set must include, at a minimum, an input and a substantive process that together significantly contribute to the ability to create output and (2) remove the evaluation of whether a market participant could replace missing elements. The amendments provide a framework to assist entities in evaluating whether both an input and a substantive process are present. Additionally, these amendments narrow the definition of the term output so that the term is consistent with how outputs are described in Topic 606, Revenue from Contracts with Customers. ASU No. 2017-01 will be effective for annual periods beginning after December 15, 2017, including interim periods within those periods. The amendments should be applied prospectively on or after the effective date. No disclosures are required at transition. We believe that future acquisitions of real estate properties will be considered asset acquisitions.

During November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, which contain amendments that require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. ASU No. 2016-18 will be effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. The amendments should be applied using a retrospective transition method to each period presented. We adopted this standard on January 1, 2018 using a retrospective transition method. The adoption did not have a material impact on our consolidated financial statements.

During August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. ASU No. 2016-15 will be effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Earlier adoption is permitted including adoption in an interim period. We adopted this standard on January 1, 2018 using a retrospective transition method. The adoption did not have a material impact 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. During November 2018, the FASB issued ASU No. 2018-19 Codification Improvements to Topic 326, Financial Instruments—Credit Losses which contain amendments relating to the transition and effective date requirements for nonpublic business entities and also clarified that receivables arising from operating leases are not within the scope of Subtopic 326-20, Financial Instruments—Credit Losses—Measured at Amortized Cost. ASU No. 2016-13 and ASU No. 2018-19 will be effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Earlier adoption as of the fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, is permitted. The amendments must be adopted through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective (that is, a modified retrospective approach). We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

During February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which requires that a lessee recognize in the statement of financial position a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. ASU No. 2016-02 leaves the accounting for leases by lessors largely unchanged from previous GAAP. ASU No. 2016-02 will be effective for fiscal years beginning after December 15, 2018 and subsequent interim periods. The new standard must be adopted using a modified retrospective transition, and provides for certain practical expedients. Transition will require application of the new guidance at the beginning of the earliest comparative period presented. This ASU is expected to result in the recognition of a right-to-use asset and related liability to account for our future obligations under our ground lease agreements for which we are the lessee. As of December 31, 2018, the remaining contractual payments under our ground lease agreements aggregated $75.9 million. In addition, under ASU 2016-02, lessors may only capitalize incremental direct leasing costs. As a result, we expect that we will no longer capitalize our non-contingent leasing costs and instead will expense these costs as incurred. These costs totaled $4.6 million for the year ended December 31, 2018. During July 2018, the FASB issued ASU No. 2018-10, Codification Improvements to Topic 842, Leases, which contains amendments which are intended to clarify or to correct unintended application of ASU No. 2016-02. Also during July 2018, the FASB issued ASU No. 2018-11, Targeted Improvements to Topic 842, Leases, which provides another transition method in addition to the existing modified retrospective transition method by allowing a cumulative effect adjustment to the opening balance of retained earnings in the period of adoption. The amendments in ASU No. 2018-11 also provide lessors with a practical expedient, by class of underlying asset, to not separate nonlease components from the associated lease component provided that (1) the timing and pattern of transfer are the same for the nonlease components and associated lease component and (2) the lease component, if accounted separately, would be classified as an operating lease. During December 2018, the FASB issued ASU No. 2018-20, Narrow-Scope Improvements for Lessors that contain amendments to further help lessors apply ASU No. 2016-02, including amendments that require lessors to (1) exclude lessor costs paid directly by lessees to third parties on the lessor's behalf from variable payments and therefore variable lease revenue and (2) include lessor costs that are paid by the lessor and reimbursed by the lessee in the measurement of variable lease revenue and the associated expense. For entities that have not yet adopted ASU No. 2016-02, the effective dates and transition requirements for ASU No. 2018-10, ASU No. 2018-11 and ASU No. 2018-20 will be the same as the effective date and transition requirements in ASU No. 2016-02. We adopted this standard on January 1, 2019 and elected the available practical expedients. ASU 2016-02 and its related amendments resulted in the recognition of right-of-use assets and lease liabilities for our operating leases on our balance sheet of approximately $30.0 million, but did not have an impact on our consolidated statements of income.

During May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which replaces all current GAAP guidance related to revenue recognition and eliminates 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. We adopted this standard on January 1, 2018 and it did not have a material impact on our consolidated financial statements.

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Deferred Costs, Acquired Lease Intangibles and Goodwill

12 Months Ended

Dec. 31, 2018

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 at December 31, 2018 and 2017 (amounts in thousands):

	2018			2017
Leasing costs	$	178,120		$	164,751
Acquired in-place lease value and deferred leasing costs	214,550			237,364
Acquired above-market leases	52,136			67,415
	444,806			469,530
Less: accumulated amortization	(209,839		)	(215,102		)
Total deferred costs, net, excluding net deferred financing costs	$	234,967		$	254,428

At December 31, 2018 and 2017, $6.3 million and $8.3 million, respectively, of net deferred financing costs associated with the unsecured revolving credit facility was included in deferred costs, net on the consolidated balance sheets.

Amortization expense related to deferred leasing and acquired deferred leasing costs was $26.3 million, $24.1 million, and $24.2 million, for the years ended December 31, 2018, 2017, and 2016, respectively. Amortization expense related to acquired lease intangibles was $12.1 million, $17.1 million and $24.6 million for the years ended December 31, 2018, 2017 and 2016, respectively.

Amortizing acquired intangible assets and liabilities consisted of the following at December 31, 2018 and 2017 (amounts in thousands):     

	2018			2017
Acquired below-market ground leases	$	396,916		$	396,916
Less: accumulated amortization	(36,518		)	(28,687		)
Acquired below-market ground leases, net	$	360,398		$	368,229

	2018			2017
Acquired below-market leases	$	(118,462	)	$	(132,026	)
Less: accumulated amortization	66,012			65,979
Acquired below-market leases, net	$	(52,450	)	$	(66,047	)

Rental revenue related to the amortization of below market leases, net of above market leases was $6.1 million, $5.7 million and $8.8 million for the years ended December 31, 2018, 2017 and 2016, respectively. The remaining weighted-average amortization period as of December 31, 2018 is 24.5 years, 4.5 years, 3.8 years and 4.0 years for below-market ground leases, in-place leases and deferred leasing costs, above-market leases and below-market leases, respectively. We expect to recognize amortization expense and rental revenue from the acquired intangible assets and liabilities as follows (amounts in thousands):

For the year ending:	Future Ground Rent Amortization		Future Amortization Expense		Future Rental Revenue
2019	$	7,831	$	15,829	$	6,875
2020	7,831		12,967		3,651
2021	7,831		11,250		2,868
2022	7,831		10,433		3,185
2023	7,831		9,756		3,181
Thereafter	321,243		31,690		9,532
	$	360,398	$	91,925	$	29,292

As of December 31, 2018, we had goodwill of $491.5 million. In 2013, we acquired the interests in Empire State Building Company, L.L.C. and 501 Seventh Avenue Associates, L.L.C. for an amount in excess of their net tangible and identified intangible assets and liabilities and as a result we recorded goodwill related to the transaction. Goodwill was allocated $227.5 million to the observatory operations of the Empire State Building, $250.8 million to Empire State Building, and $13.2 million to 501 Seventh Avenue.

We performed an annual review of goodwill for impairment and concluded there was no impairment of goodwill. Our methodology to review goodwill impairment, which includes a significant amount of judgment and estimates, provides a reasonable basis to determine whether impairment has occurred. However, many of the factors employed in determining whether or not goodwill is impaired are outside of our control and it is reasonably likely that assumptions and estimates will change in future periods.

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Debt

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Debt

Debt

Debt consisted of the following as of December 31, 2018 and 2017 (amounts in thousands):

							As of December 31, 2018
	Principal Balance as of December 31, 2018			Principal Balance as of December 31, 2017			Stated Rate		Effective Rate(1)		Maturity Date(2)
Fixed rate mortgage debt
Metro Center	$	91,838		$	93,948		3.59	%	3.68	%	11/5/2024
10 Union Square	50,000			50,000			3.70	%	3.97	%	4/1/2026
1542 Third Avenue	30,000			30,000			4.29	%	4.53	%	5/1/2027
First Stamford Place(3)	180,000			180,000			4.28	%	4.45	%	7/1/2027
1010 Third Avenue and 77 West 55th Street	38,995			39,710			4.01	%	4.22	%	1/5/2028
10 Bank Street	33,779			34,602			4.23	%	4.35	%	6/1/2032
383 Main Avenue	30,000			30,000			4.44	%	4.55	%	6/30/2032
1333 Broadway	160,000			66,602			4.21	%	4.29	%	2/5/2033
1400 Broadway
(first lien mortgage loan)	—			66,632			—		—		—
(second lien mortgage loan)	—			9,172			—		—		—
111 West 33rd Street
(first lien mortgage loan)	—			74,045			—		—		—
(second lien mortgage loan)	—			9,369			—		—		—
1350 Broadway	—			37,144			—		—		—
Total mortgage debt	614,612			721,224
Senior unsecured notes - exchangeable	250,000			250,000			2.63	%	3.93	%	8/15/2019
Senior unsecured notes: (4)
Series A	100,000			100,000			3.93	%	3.96	%	3/27/2025
Series B	125,000			125,000			4.09	%	4.12	%	3/27/2027
Series C	125,000			125,000			4.18	%	4.21	%	3/27/2030
Series D	115,000			115,000			4.08	%	4.11	%	1/22/2028
Series E	160,000			—			4.26	%	4.27	%	3/22/2030
Series F	175,000			—			4.44	%	4.45	%	3/22/2033
Unsecured revolving credit facility (4)	—			—			(5)		(5)		8/29/2021
Unsecured term loan facility (4)	265,000			265,000			(6)		(6)		8/29/2022
Total principal	1,929,612			1,701,224
Unamortized (discount) premiums, net of unamortized premiums (discount)	(1,647		)	(3,370		)
Deferred financing costs, net	(9,032		)	(9,133		)
Total	$	1,918,933		$	1,688,721

______________

(1) The effective rate is the yield as of December 31, 2018, including the effects of debt issuance costs and the amortization of the fair value of debt adjustment.

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

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

(4) At December 31, 2018, we were in compliance with all debt covenants.

(5) At December 31, 2018, the unsecured revolving credit facility bears a floating rate at 30 day LIBOR plus 1.10%. The rate at December 31, 2018 was 3.60%.

(6) The unsecured term loan facility bears a floating rate at 30 day LIBOR plus 1.20%. Pursuant to an interest rate swap agreement, the LIBOR rate is fixed at 2.1485% through maturity. The rate at December 31, 2018 was 3.35% .

Mortgage Debt

During January 2018, we refinanced and increased our mortgage debt on 1333 Broadway from $66.6 million to $160.0 million. A portion of this increase was applied to release the $75.8 million mortgage lien on 1400 Broadway.

During March 2018, we repaid our mortgage indebtedness on 111 West 33rd Street and 1350 Broadway.

Principal Payments

Aggregate required principal payments at December 31, 2018 are as follows (amounts in thousands):

Year	Amortization		Maturities		Total
2019	$	3,790	$	250,000	$	253,790
2020	3,938		—		3,938
2021	4,090		—		4,090
2022	5,628		265,000		270,628
2023	7,876		—		7,876
Thereafter	33,868		1,355,422		1,389,290
Total principal maturities	$	59,190	$	1,870,422	$	1,929,612

Deferred Financing Costs

Deferred financing costs, net, consisted of the following at December 31, 2018 and 2017 (amounts in thousands):     

	2018			2017
Financing costs	$	25,315		$	24,446
Less: accumulated amortization	(10,027		)	(7,039		)
Total deferred financing costs, net	$	15,288		$	17,407

At December 31, 2018 and 2017, $6.3 million and $8.3 million, respectively, of net deferred financing costs associated with the unsecured revolving credit facility were included in deferred costs, net on the consolidated balance sheet.

Amortization expense related to deferred financing costs was $4.1 million, $4.7 million, and $5.0 million, for the years ended December 31, 2018, 2017 and 2016, respectively, and was included in interest expense.

Unsecured Revolving Credit and Term Loan Facility

During August 2017, we entered into an amended and restated senior unsecured revolving credit and term loan facility (the “Facility”) with Bank of America, N.A., as administrative agent, Merrill Lynch, Pierce, Fenner & Smith Incorporated and Wells Fargo Securities, LLC as Joint Lead Arrangers and Joint Bookrunners, Wells Fargo, National Association and Capital One, National Association, as co-syndication agents, and the lenders party thereto. The Facility amended and restated the credit facility dated as of January 23, 2015, with Bank of America, N.A., Merrill Lynch, Goldman Sachs and the other lenders party thereto. In connection with the modification of the credit facility and term loan, we incurred a loss on early extinguishment of debt of $2.2 million which is reflected in our consolidated statement of income for the year ended December 31, 2017. This transaction extended the unsecured revolving credit and term loan facility maturity, lowered borrowing costs and added flexibility to the financial covenants.

The Facility is in the original principal amount of up to $1.365 billion which consists of a $1.1 billion revolving credit facility and a $265.0 million term loan facility. The new revolving credit facility replaced a credit facility which was due to mature in January 2019 and was undrawn when amended. The term loan facility was borrowed in full at closing and used to repay a $265.0 million term loan that had been due in 2022. We may request the Facility be increased through one or more increases in the revolving credit facility or one or more increases in the term loan facility or the addition of new pari passu term loan tranches, for a maximum aggregate principal amount not to exceed $1.75 billion.

The initial maturity of the unsecured revolving credit facility is August 2021. We have the option to extend the initial term for up to two additional 6-month periods, subject to certain conditions, including the payment of an extension fee equal to

0.0625% and 0.075% of the then outstanding commitments under the unsecured revolving credit facility on the first and the second extensions, respectively. The term loan facility matures on August 2022. We may prepay the loans under the Facility at any time, subject to reimbursement of the lenders’ breakage and redeployment costs in the case of prepayment of Eurodollar Rate borrowings.

The Facility includes the following financial covenants: (i) maximum leverage ratio of total indebtedness to total asset value (as defined in the agreement) of the loan parties and their consolidated subsidiaries will not exceed 60%, (ii) consolidated secured indebtedness will not exceed 40% of total asset value, (iii) tangible net worth will not be less than $1.2 billion plus 75% of net equity proceeds received by 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 Facility) to consolidated fixed charges will not be less than 1.50x, (v) the aggregate net operating income with respect to all unencumbered eligible properties to the portion of interest expense attributable to unsecured indebtedness will not be less than 1.75x, and (vi) the ratio of total unsecured indebtedness to unencumbered asset value will not exceed 60%.

The Facility contains customary covenants, including limitations on liens, investment, distributions, debt, fundamental changes, and transactions with affiliates, and requires certain customary financial reports. The 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 (defined in the agreement for the Facility).

As of December 31, 2018, we were in compliance with the covenants under the Facility.

Senior Unsecured Notes Exchangeable

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. Interest on the 2.625% Exchangeable Senior Notes is payable semi-annually in arrears on February 15 and August 15 of each year. The 2.625% Exchangeable Senior Notes are senior unsecured obligations and rank equally in right of payment with all of our other senior unsecured indebtedness and effectively subordinated in right of payment to all of our secured indebtedness (to the extent of the value of the collateral securing such indebtedness) and structurally subordinated to all liabilities and preferred equity of our subsidiaries.

The 2.625% Exchangeable Senior Notes will mature on August 15, 2019, unless earlier exchanged, redeemed or repurchased. Holders may exchange their 2.625% Exchangeable Senior Notes at their option at any time prior to the close of business on the business day immediately preceding May 15, 2019 only under the following circumstances: (i) during any calendar quarter beginning after September 30, 2014 (and only during such quarter) if the closing sale price of our Class A common stock is more than 130% of the then current exchange price for at least 20 trading days (whether or not consecutive) in the period of the 30 consecutive trading days ending on the last trading day of the previous calendar quarter; (ii) during the five consecutive business-day period following any five consecutive trading-day period in which the trading price per 1,000 principal amount of the 2.625% Exchangeable Senior Notes for each trading day during such five consecutive trading-day period in which the trading price per 1,000 principal amount of the 2.625% Exchangeable Senior Notes for each trading day during such five trading-day period was less than 98% of the closing sale price of our Class A common stock, for each trading day during such five trading-day period multiplied by the then current exchange rate; (iii) if we call any or all of the 2.625% Exchangeable Senior Notes for redemption, at any time prior to the close of business on the scheduled trading day immediately preceding the redemption date; or (iv) upon the occurrence of specified corporate transactions (significant consolidation, sale, merger, share exchange, fundamental change, etc.).

On or after May 15, 2019, and on or prior to the second scheduled trading day immediately preceding the maturity date, holders may exchange their notes without regard to the foregoing conditions.

The 2.625% Exchangeable Senior Notes will be exchangeable into cash, shares of Class A common stock or a combination of cash and shares of Class A common stock, at our election. We have asserted it is our intent and ability to settle the principal amount of the 2.625% Exchangeable Senior Notes in cash. The initial exchange rate of 2.625% Exchangeable Senior Notes is 51.4059 shares per $1,000 principal amount of notes (equivalent to an initial exchange price of approximately $19.45 per share of Class A common stock), subject to adjustment, as described in the related indenture governing the 2.625% Exchangeable Senior Notes. As of December 31, 2018, the exchange rate of the 2.625% Exchangeable Senior Notes was 52.0116 shares per $1,000 principal amount of notes (equivalent to an initial exchange price of approximately $19.23 per share of Class A common stock), subject to adjustment, as described in the related indenture governing the 2.625% Exchangeable Senior Notes.

Following certain corporate transactions which constitute a make-whole fundamental change (defined in the indenture), we will increase the exchange rate for holders who elect to exchange their 2.625% Exchangeable Senior Notes in connection with such make whole fundamental change in certain circumstances. Following certain corporate transactions which constitute a fundamental change, holders may require us to repurchase the 2.625% Exchangeable Senior Notes for cash at a price equal to 100% of the principal amount of the notes to be purchased plus any accrued and unpaid interest to, but excluding, the repurchase date.

We have separately accounted for the liability and equity components of the 2.625% Exchangeable Senior Notes by bifurcating gross proceeds between the indebtedness, or liability component, and the embedded conversion option, or the equity component. The bifurcation was done by estimating an effective interest rate as of the date of the issuance for similar notes which do not contain an embedded conversion option. This effective interest rate was estimated to be 3.8% and was used to compute the fair value at the time of issuance for the indebtedness of $236.6 million. The gross proceeds from the issuance of the 2.625% Exchangeable Senior Notes less the initial amount allocated to the indebtedness resulted in a $13.4 million allocation to the embedded conversion option which is included in Equity, net of financing costs, in the consolidated balance sheets as of December 31, 2018 and 2017. The resulting debt discount is being amortized over the five year period in which the 2.625% Exchangeable Senior Notes are expected to be outstanding (that is, through maturity date) as additional non-cash interest expense. As of December 31, 2018 and 2017, the unamortized discount was $1.6 million and $4.3 million, respectively.

Underwriting discounts and commissions and issuance costs totaled $3.1 million and were allocated to the indebtedness and the embedded conversion option on a pro-rata basis and accounted for as debt issuance costs and equity issuance costs, respectively. In this connection, $2.9 million attributable to the indebtedness was recorded as part of deferred costs, to be subsequently amortized using the effective interest method as interest expense over the expected term of the 2.625% Exchangeable Senior Notes, and $0.2 million attributable to the embedded conversion option was recorded as a reduction to Equity in the consolidated balance sheets as of December 31, 2018 and 2017.

For the years ended December 31, 2018, 2017 and 2016, total interest expense related to the 2.625% Exchangeable Senior Notes was $9.9 million, $9.9 million and $9.9 million, respectively, consisting of (i) contractual interest expense of $6.6 million, $6.6 million and $6.6 million, respectively, (ii) additional non-cash interest expense of $2.7 million, $2.7 million and $2.7 million, respectively, related to the accretion of the debt discount, and (iii) amortization of deferred financing costs of $0.6 million, $0.6 million and $0.6 million, respectively.

Senior Unsecured Notes

During December 2017, we entered into an agreement to issue and sell an aggregate principal amount of $450.0 million of senior unsecured notes consisting of $115.0 million of 4.08% Series D Senior Notes due 2028, $160.0 million of 4.26% Series E Senior Notes due 2030, and $175.0 million of 4.44% Series F Senior Notes due 2033. We issued and sold the Series D Senior Notes in December 2017 and the Series E and F Senior Notes in March 2018. In connection with the March

2018 issuance of the notes, we repaid our mortgage indebtedness on 111 West 33rd Street and 1350 Broadway.

The terms of the Series A, B, C, D, E, and F senior notes agreements include customary covenants, including limitations on liens, investment, distributions, debt, fundamental changes, and transactions with affiliates and require certain customary financial reports. It also 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, and a maximum unsecured leverage ratio. As of December 31, 2018, we were in compliance with the covenants under the outstanding Senior Unsecured Notes.

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Accounts Payable and Accrued Expenses

12 Months Ended

Dec. 31, 2018

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 December 31, 2018 and 2017 (amounts in thousands):

	2018		2017
Accrued capital expenditures	$	85,242	$	71,769
Accounts payable and accrued expenses	34,585		32,509
Interest rate swap agreements liability	5,243		436
Accrued interest payable	4,990		5,687
Due to affiliated companies	616		448
Total accounts payable and accrued expenses	$	130,676	$	110,849

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Financial Instruments and Fair Values

12 Months Ended

Dec. 31, 2018

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 December 31, 2018, 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 $5.3 million. If we had breached any of these provisions at December 31, 2018, we could have been required to settle our obligations under the agreements at their termination value of $5.3 million.

As of December 31, 2018 and 2017, we had interest rate LIBOR swaps with an aggregate notional value of $515.0 million and $265.0 million, respectively, which were designated as cash flow hedges of interest rate risk. We are hedging variability in future cash flows associated with our existing variable-rate term loan facility and with a forecasted refinancing of our exchangeable senior notes. The notional value does not represent exposure to credit, interest rate or market risks. As of December 31, 2018, the fair value of these derivative instruments amounted to $2.5 million which is included in prepaid expenses and other assets and ($5.2 million) which is included in accounts payable and accrued expenses on the consolidated balance sheet. As of December 31, 2017, the fair value of the derivative instrument amounted to ($0.4 million) which is included in accounts payable and accrued expenses on the consolidated balance sheet.

As of December 31, 2018 and 2017, a net unrealized loss of $0.9 million and $10.5 million, respectively, is reflected in the consolidated statements of comprehensive income (loss) relating to both active and terminated cash flow hedges of interest rate risk. Amounts reported in accumulated other comprehensive income (loss) related to derivatives will be reclassified to interest expense as interest payments are made on the debt. We estimate that $0.9 million net loss of the current balance held in accumulated other comprehensive loss will be reclassified into interest expense within the next 12 months.

For the year ended December 31, 2017, we recognized a loss of $0.3 million from derivative financial instruments, incurred in connection with the partial termination and re-designation of related cash flow hedges.

The table below summarizes the terms of agreements and the fair values of our derivative financial instruments as of December 31, 2018 and 2017 (dollar amounts in thousands):     

								December 31, 2018					December 31, 2017
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	$	2,536	$	—		$	—	$	(436	)
Interest rate swap	125,000		3 Month LIBOR	2.9580	%	July 1, 2019	July 1, 2026	—		(2,623		)	—		—
Interest rate swap	125,000		3 Month LIBOR	2.9580	%	July 1, 2019	July 1, 2026	—		(2,620		)	—		—
								$	2,536	$	(5,243	)	$	—	$	(436	)

The table below shows the effect of our derivative financial instruments designated as cash flow hedges on accumulated other comprehensive income (loss) for the years ended December 31, 2018, 2017 and 2016 (amounts in thousands):    

Effects of Cash Flow Hedges	December 31, 2018			December 31, 2017			December 31, 2016
Amount of gain (loss) recognized in other comprehensive income (loss)	$	(2,721	)	$	(11,658	)	$	(3,054	)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense	(1,845		)	(1,142		)	—

The table below shows the effect of our derivative financial instruments designated as cash flow hedges on the consolidated statements of income for the years ended December 31, 2018, 2017 and 2016 (amounts in thousands):

Effects of Cash Flow Hedges	December 31, 2018			December 31, 2017			December 31, 2016
Total interest (expense) presented on the consolidated statements of income in which the effects of cash flow hedges are recorded	$	(79,623	)	$	(68,473	)	$	(70,595	)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense	(1,845		)	(1,142		)	—

Fair Valuation

The estimated fair values at December 31, 2018 and 2017 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 following tables summarize the carrying and estimated fair values of our financial instruments as of December 31, 2018 and 2017 (amounts in thousands):

	December 31, 2018
	Carrying Value		Estimated Fair Value
			Total		Level 1		Level 2		Level 3
Interest rate swaps included in prepaid expenses and other assets	$	2,536	$	2,536	$	—	$	2,536	$	—
Interest rate swaps included in accounts payable and accrued expenses	5,243		5,243		—		5,243		—
Mortgage notes payable	608,567		597,424		—		—		597,424
Senior unsecured notes - Exchangeable	247,930		250,625		—		250,625		—
Senior unsecured notes - Series A, B, C, D, E and F	798,289		795,662		—		—		795,662
Unsecured term loan facility	264,147		265,000		—		—		265,000

	December 31, 2017
	Carrying Value		Estimated Fair Value
			Total		Level 1		Level 2		Level 3
Interest rate swaps included in prepaid expenses and other assets	$	—	$	—	$	—	$	—	$	—
Interest rate swaps included in accounts payable and accrued expenses	436		436		—		436		—
Mortgage notes payable	717,164		707,300		—		—		707,300
Senior unsecured notes - Exchangeable	244,739		275,723		—		275,723		—
Senior unsecured notes - Series A, B, C, D, E and F	463,156		460,352		—		—		460,352
Unsecured term loan facility	263,662		265,000		—		—		265,000

Disclosure about the fair value of financial instruments is based on pertinent information available to us as of December 31, 2018 and 2017. Although we are not aware of any factors that would significantly affect the reasonable fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since that date and current estimates of fair value may differ significantly from the amounts presented herein.

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Rental Income

12 Months Ended

Dec. 31, 2018

Leases [Abstract]

Rental Income

Rental Income

We lease various spaces to tenants over various terms. 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 consolidated statements of income as tenant expense reimbursement.

As of December 31, 2018, we were entitled to the following future contractual minimum lease payments on non-cancellable operating leases to be received which expire on various dates through 2038 (amounts in thousands):

2019	$	485,441
2020	460,127
2021	423,365
2022	391,395
2023	362,738
Thereafter	1,536,461
	$	3,659,527

The above future minimum lease payments exclude tenant recoveries, amortization of deferred rent receivables and the net accretion of above-below-market lease intangibles. Some leases are subject to termination options generally upon payment of a termination fee. The preceding table is prepared assuming such options are not exercised.

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Legal Proceedings

Litigation

Except as described below, as of December 31, 2018, we were not involved in any material litigation, nor, to our knowledge, was any material litigation threatened against us or our properties, other than routine litigation arising in the ordinary course of business such as disputes with tenants. We believe that the costs and related liabilities, if any, which may result from such actions will not materially affect our condensed consolidated financial position, operating results or liquidity.    

As previously disclosed, in October 2014, 12 former investors in Empire State Building Associates L.L.C. (“ESBA”), which prior to the initial public offering of our company (the "Offering"), owned the fee title to the Empire State Building, filed an arbitration with the American Arbitration Association against Peter L. Malkin, Anthony E. Malkin, Thomas N. Keltner, Jr., and our subsidiary ESRT MH Holdings LLC, the former supervisor of ESBA, as respondents. The statement of claim (also filed later in federal court in New York for the expressed purpose of tolling the statute of limitations) alleges breach of fiduciary duty and related claims in connection with the Offering and formation transactions and seeks monetary damages and declaratory relief. These investors had opted out of a prior class action bringing similar claims that was settled with court approval. The respondents filed an answer and counterclaims. In March 2015, the federal court action was stayed on consent of all parties pending the arbitration. Arbitration hearings for a select number of sessions started in May 2016 and concluded in August 2018. Post-hearing briefing is currently scheduled to be completed by June 25, 2019.

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

Pursuant to indemnification agreements which were made with our directors, executive officers and chairman emeritus as part of our formation transactions, Anthony E. Malkin, Peter L. Malkin and Thomas N. Keltner, Jr. have defense and indemnity rights from us with respect to this arbitration.

Ground Lease Commitments

We make payments under ground leases related to three of our properties. Minimum rent is expensed on a straight-line basis over the non-cancellable term of the leases. The ground leases are due to expire between the years 2050 and 2077. Future minimum lease payments to be paid over the terms of the leases are as follows (amounts in thousands):

2019	$	1,518
2020	1,518
2021	1,518
2022	1,518
2023	1,518
Thereafter	68,298
Total	$	75,888

Unfunded Capital Expenditures

At December 31, 2018, we estimate that we will incur approximately $88.4 million of capital expenditures (including tenant improvements and leasing commissions) on our properties pursuant to existing lease agreements. We expect to fund these capital expenditures with operating cash flow, additional property level mortgage financings, our unsecured credit facility, cash on hand and other borrowings. Future property acquisitions may require substantial capital investments for refurbishment and leasing costs. We expect that these financing requirements will be met in a similar fashion.

Concentration of Credit Risk

Financial instruments that subject us to credit risk consist primarily of cash and cash equivalents, restricted cash, short-term investments, tenant and other receivables and deferred rent receivables. At December 31, 2018, we held on deposit at various major financial institutions cash and cash equivalents, restricted cash balances and short-term investments in excess of amounts insured by the Federal Deposit Insurance Corporation.

Real Estate Investments

Our properties are located in Manhattan, New York; Fairfield County, Connecticut; and Westchester County, New York. The latter locations are suburbs of the city of New York. The ability of the tenants to honor the terms of their respective leases is dependent upon the economic, regulatory and social factors affecting the markets in which the tenants operate. We perform ongoing credit evaluations of our tenants for potential credit losses.

Tenant Credit Evaluations

Our investments in real estate properties are subject to risks incidental to the ownership and operation of commercial real estate. These risks include, among others, the risks normally associated with changes in general economic conditions, trends in the real estate industry, creditworthiness of tenants, competition of tenants and customers, changes in tax laws, interest rate levels, the availability and cost of financing, and potential liability under environmental and other laws.

We may require tenants to provide some form of credit support such as corporate guarantees and/or other financial guarantees and we perform ongoing credit evaluations of tenants. Although the tenants operate in a variety of industries, to the extent we have a significant concentration of rental revenue from any single tenant, the inability of that tenant to make its lease payments could have an adverse effect on our company.

Major Customers and Other Concentrations

For the year ended December 31, 2018, other than five tenants who accounted for 6.0%, 3.1%, 2.9%, 2.0% and 2.0% of rental revenues, no other tenant in our portfolio accounted for more than 2.0% of rental revenues. For the year ended December 31, 2017, other than five tenants who accounted for 6.3%, 3.2%, 2.9%, 2.1% and 2.0% of rental revenues, no other tenant in our portfolio accounted for more than 2.0% of rental revenues. For the year ended December 31, 2016, other than five tenants who accounted for 6.4%, 3.3%,2.9%, 2.3% and 2.0% of rental revenues, no other tenant in our portfolio accounted for more than 2.0% of rental revenues.

For the years ended December 31, 2018, 2017 and 2016, the six properties listed below accounted for the indicated percentage of total rental revenues. No other property accounted for more than 5.0% of total rental revenues.

	Year Ended December 31,
	2018		2017		2016
Empire State Building	31.9	%	32.0	%	32.6	%
One Grand Central Place	12.8	%	13.1	%	12.5	%
111 West 33rd Street	9.3	%	8.6	%	6.8	%
1400 Broadway	7.1	%	7.4	%	7.8	%
First Stamford Place	5.9	%	5.4	%	6.4	%
250 West 57th Street	5.2	%	5.2	%	5.3	%

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 December 31, 2018, 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 December 31, 2018, 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 and combined 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.

Multiemployer Pension and Defined Contribution Plans

We contribute to a number of multiemployer defined benefit pension plans under the terms of collective bargaining agreements that cover our union-represented employees. The risks of participating in these multiemployer plans are different from single-employer plans in the following respects:

• Assets contributed to the multiemployer plan by one employer may be used to provide benefits to employees of other participating employers.

• If a participating employer stops contributing to the plan, the unfunded obligations of the plan may be borne by the remaining participating employers.

• If we choose to stop participating in some of our multiemployer plans, we may be required to pay those plans an amount based on the underfunded status of the plan, referred to as a withdrawal liability.

We participate in various unions. The union in which we have significant employees and costs is 32BJ.

32BJ

We participate in the Building Service 32BJ, ("Union"), Pension Plan and Health Plan. The Pension Plan is a multi-employer, non-contributory defined benefit pension plan that was established under the terms of collective bargaining agreements between the Service Employees International Union, Local 32BJ, the Realty Advisory Board on Labor Relations, Inc. and certain other employers. This Pension Plan is administered by a joint board of trustees consisting of union trustees and employer trustees and operates under employer identification number 13-1879376. The Pension Plan year runs from July 1 to June 30. Employers contribute to the Pension Plan at a fixed rate on behalf of each covered employee. Separate actuarial information regarding such pension plans is not made available to the contributing employers by the union administrators or trustees, since the plans do not maintain separate records for each reporting unit. However, on September 28, 2016, September 28, 2017 and September 28, 2018, the actuary certified that for the plan years beginning July 1, 2016, July 1, 2017 and July 1, 2018, respectively, the Pension Plan was in critical status under the Pension Protection Act of 2006. The Pension Plan trustees adopted a rehabilitation plan consistent with this requirement. For each of the years ended June 30, 2018, 2017 and 2016, the Pension Plan received contributions from employers totaling $272.3 million, $257.8 million and $249.5 million, respectively.

The Health Plan was established under the terms of collective bargaining agreements between the Union, the Realty Advisory Board on Labor Relations, Inc. and certain other employers. The Health Plan provides health and other benefits to eligible participants employed in the building service industry who are covered under collective bargaining agreements, or other written agreements, with the Union. The Health Plan is administered by a Board of Trustees with equal representation by the employers and the Union and operates under employer identification number 13-2928869. The Health Plan receives contributions in accordance with collective bargaining agreements or participation agreements. Generally, these agreements provide that the employers contribute to the Health Plan at a fixed rate on behalf of each covered employee. For the years ended June 30, 2018, 2017 and 2016, the Health Plan received contributions from employers totaling $1.4 billion, $1.3 billion and $1.2 billion, respectively.

Term of Collective Bargaining Agreement

The most recent collective bargaining agreement for Local 32BJ commenced from January 1, 2016 and runs through December 31, 2019.

Contributions

Contributions we made to the multi-employer plans for the years ended December 31, 2018, 2017 and 2016 are included in the table below (amounts in thousands):

	For the Year Ended December 31,
Benefit Plan	2018		2017		2016
Pension Plans (pension and annuity)*	$	3,327	$	3,035	$	3,155
Health Plans**	9,373		8,551		8,280
Other***	814		856		542
Total plan contributions	$	13,514	$	12,442	$	11,977

* Pension plans include $1.0 million, $0.9 million and $0.8 million for the years ended 2018, 2017 and 2016, respectively, to multiemployer plans not discussed above.

** Health plans include $1.6 million, $1.6 million and $1.6 million for the years ended 2018, 2017 and 2016, respectively, to multiemployer plans not discussed above.

*** Other consists of union costs which were not itemized between pension and health plans. Other includes $0.2 million, $0.2 million and $0.2 million for the years ended 2018, 2017 and 2016, respectively, in connection with other multiemployer plans not discussed above.

Benefit plan contributions are included in operating expenses in our consolidated statements of income.

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Capital

12 Months Ended

Dec. 31, 2018

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

Capital

Capital

During 2016, Q REIT Holding LLC, a Qatar Financial Centre limited liability company and a wholly owned subsidiary of the Qatar Investment Authority, a governmental authority of the State of Qatar ("QREIT", and together with any eligible transferee, "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.

During the second quarter of 2018, pursuant to an August 2016 stockholders agreement between ESRT and QIA, ESRT sold 284,015 shares of ESRT Class A common stock (the “Top Up Shares”) to QIA pursuant to its top-up right to acquire its 9.9% pro rata share of new equity securities issued during the first quarter of 2018 (in this case, equity compensation).  The aggregate purchase price which QIA paid to ESRT for the Top Up Shares was $4.7 million, or $16.72 per share of ESRT Class A common stock, in accordance with a formula in the stockholders agreement equal to the average closing price per share during the five (5) consecutive trading days immediately preceding the issuance of the applicable new equity securities.

As of December 31, 2018, there were approximately 303.3 million operating partnership units outstanding, of which approximately 174.9 million, or 57.7%, were owned by ESRT and approximately 128.4 million, or 42.3%, 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 Empire State Realty Trust Inc. 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 operating partnership units on a one-for-one basis.     

LTIP units subject to time based vesting, whether vested or not, receive the same per unit distributions as OP Units, which equal per share dividends (both regular and special) on our common stock. Market based LTIP units 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.

Private Perpetual Preferred Units

As of December 31, 2018, there were 1,560,360 Private Perpetual Preferred Units ("Preferred Units") which have a liquidation preference of $16.62 per unit and which are entitled to receive cumulative preferential annual cash distributions of $0.60 per unit payable in arrears on a quarterly basis. The Preferred Units are not redeemable at the option of the holders and are redeemable at our option only in the case of specific defined events.

Distributions

The following table summarizes the distributions paid on our operating partnership units for the years ended December 31, 2018, 2017 and 2016:

Record Date	Payment Date	Amount per Operating Partnership Unit
December 17, 2018	December 31, 2018	$0.105
September 14, 2018	September 28, 2018	$0.105
June 15, 2018	June 29, 2018	$0.105
March 15, 2018	March 30, 2018	$0.105
December 15, 2017	December 29, 2017	$0.105
September 15, 2017	September 29, 2017	$0.105
June 15, 2017	June 30, 2017	$0.105
March 15, 2017	March 31, 2017	$0.105
December 15, 2016	December 29, 2016	$0.105
September 19, 2016	September 30, 2016	$0.105
June 15, 2016	June 30, 2016	$0.105
March 16, 2016	March 31, 2016	$0.085

Total distributions paid to OP unitholders and Preferred unitholders during 2018, 2017 and 2016 totaled $126.5 million, $127.0 million and $115.0 million, respectively.

Incentive and Share-Based Compensation

The 2013 Plan provides for grants to our directors, employees and consultants of our company and ESRT consisting of stock options, restricted stock, dividend equivalents, stock payments, performance shares, LTIP units, stock appreciation rights and other incentive awards. An aggregate of approximately 12.2 million shares of ESRT common stock are authorized for issuance under awards granted pursuant to the 2013 Plan, and as of December 31, 2018, approximately 4.3 million shares of ESRT common stock remain available for future issuance.

In May 2018, we made grants of LTIP units to our non-employee directors under the 2013 Plan. At such time, we granted a total of 65,000 LTIP units that are subject to time-based vesting with fair market values of $1.0 million. The awards vest ratably over three years from the date of the grant, subject generally to the director's continued service on our Board of Directors.

In March 2018, we made grants of LTIP units to executive officers under the 2013 Plan. At such time, we granted to executive officers a total of 386,876 LTIP units that are subject to time-based vesting and 1,737,917 LTIP units that are subject to market-based vesting awards. In March 2018, we made grants of LTIP units and restricted stock to certain other employees under the 2013 Plan. At such time, we granted to certain other employees a total of 67,449 LTIP units and 39,608 shares of restricted stock that are subject to time-based vesting and 223,950 LTIP units that are subject to market-based vesting, with fair market values of $1.7 million for the time-based vesting awards and $1.1 million for the market-based vesting awards. The awards subject to time-based vesting vest ratably over four years from January 1, 2018, subject generally to the grantee's continued employment. The first installment vests on January 1, 2019 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, 2018. 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, 2021 and the second installment vesting on January 1, 2022, subject generally to the grantee's continued employment on those dates.

In 2017, our board of directors determined to reinforce the alignment of our executive officers’ interests with that of stockholders by designing a new bonus election program, under which named executive officers could elect to receive their annual incentive bonus in any combination of (i) cash or vested LTIP's at the face amount of such bonus or (ii) time-vesting LTIP's which would vest over three years, subject to continued employment, at 125% of such face amount. In February 2018, we made grants of LTIP units to executive officers under the 2013 Plan in connection with the 2017 bonus election program. We granted to executive officers a total of 238,609 LTIP units that are subject to time based vesting with a fair market value $4.0 million. Of these LTIP units, 25,158 LTIP units vested immediately on the grant date and 213,451 LTIP units vest ratably over three years from January 1, 2018, subject generally to the grantee's continued employment. The first installment vests on January 1, 2019 and the remainder will vest thereafter in two equal annual installments.

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

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

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

LTIP units and ESRT restricted stock issued during the year ended December 31, 2018, 2017 and 2016 were valued at $23.6 million, $19.4 million and $18.4 million, respectively. The weighted-average per unit or share fair value was $8.54, $13.77 and $9.60 for grants issued in 2018, 2017 and 2016, respectively. The per unit or share granted in 2018 was estimated on the respective dates of grant using the following assumptions: an expected life of 2.8 years, a dividend rate of 2.30%, a risk-free interest rate of 2.50%, and an expected price volatility of 20.0%. The per unit or share granted in 2017 was estimated on the respective dates of grant using the following assumptions: an expected life of 2.8 years, a dividend rate of 2.05%, a risk-free interest rate of 1.55% and an expected price volatility of 20.0%. The per unit or share granted in 2016 was estimated on the respective dates of grant using the following assumptions: an expected life of 2.8 years, a dividend rate of 2.10%, a risk-free interest rate of 0.84%, and an expected price volatility of 24.0%.

No other stock options, dividend equivalents, or stock appreciation rights were issued or outstanding in 2018, 2017 and 2016.

The following is a summary of ESRT restricted stock and LTIP unit activity for the year ended December 31, 2018:

	ESRT Restricted Stock		LTIP Units		Weighted Average Grant Fair Value
Unvested balance at December 31, 2017	90,791		3,588,609		$	11.20
Vested	(30,693	)	(495,303	)	14.59
Granted	39,608		2,719,801		8.54
Forfeited or unearned	(8,548	)	(110,286	)	8.50
Unvested balance at December 31, 2018	91,158		5,702,821		$	9.68

The total fair value of LTIP units and restricted stock that vested during 2018, 2017 and 2016 was $7.7 million, $7.6 million and $5.1 million, respectively.

The LTIP unit and ESRT restricted stock award agreements will immediately vest when a grantee attains the (i) 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 market-based awards, and accordingly, we recognized $1.8 million, $1.0 million and $0.7 million for the years ended December 31, 2018, 2017 and 2016, respectively. Unrecognized compensation expense was $1.0 million at December 31, 2018, which will be recognized over a weighted average period of 2.1 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 $17.0 million, $13.1 million and $9.0 million in noncash compensation expense for the years ended December 31, 2018, 2017 and 2016, respectively. Unrecognized compensation expense was $27.4 million at December 31, 2018, which will be recognized over a weighted average period of 2.2 years.

Earnings Per Unit

Earnings per unit for the years ended December 31, 2018, 2017 and 2016 is computed as follows (amounts in thousands, except per share amounts):

	For the Year Ended December 31,
	2018			2017			2016
Numerator:
Net income	$	117,253		$	118,253		$	107,250
Private perpetual preferred unit distributions	(936		)	(936		)	(936		)
Earnings allocated to unvested shares	(851		)	(760		)	(747		)
Net income attributable to common unitholders - basic and diluted	$	115,466		$	116,557		$	105,567
Denominator:
Weighted average units outstanding - basic	297,258			296,455			276,848
Effect of dilutive securities:
Stock-based compensation plans	1			775			454
Exchangeable senior notes	—			819			266
Weighted average shares outstanding - diluted	297,259			298,049			277,568
Earnings per unit - basic and diluted	$	0.39		$	0.39		$	0.38

There were 485,865, 834,267 and 800,746 antidilutive shares and LTIP units for the years ended December 31, 2018, 2017 and 2016, respectively.

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Related Party Transactions

12 Months Ended

Dec. 31, 2018

Related Party Transactions [Abstract]

Related Party Transactions

Related Party Transactions

QIA

In connection with any new issuance by us of common equity securities, for so long as QIA maintains at least a 5.0% fully diluted economic interest in ESRT and remains in material compliance with the terms of the stockholders agreement, QIA will have the right (but not the obligation) to purchase its pro rata share of such new equity securities in the form of newly issued shares of ESRT Class A common stock. These “top up” rights are generally exercisable on a quarterly basis, or sooner if we or ESRT issues new equity securities in an issuance in excess of $1.0 million.

Through August 2021, QIA will have the right of first offer to co-invest with ESRT as a joint venture partner in real estate investment opportunities initiated by ESRT where ESRT has elected, at its discretion, to seek a joint venture partner. The right of first offer period will be extended for a 30-month term if at least one joint venture transaction is consummated among ESRT and QIA during the initial five year term, and will be extended for a further 30-month term if at least one joint venture transaction is consummated during such initial 30-month extension term.

Subject to certain minimum thresholds and conditions, ESRT will indemnify QIA for certain applicable U.S. federal and state taxes payable by QIA in connection with dividends paid by ESRT on the QIA shares that are attributable to capital gains from the sale or exchange of any U.S. real property interests. ESRT's obligation to indemnify QIA will terminate one year following the date on which the sum of the QIA shares then owned by QIA falls below 10% of ESRT outstanding common shares.

Tax Protection Agreement

In 2013, we and ESRT entered into a tax protection agreement with Anthony E. Malkin and Peter L. Malkin that is intended to protect to a limited extent the Malkin Group and an additional third party investor in Metro Center (who was one of the original landowners and was involved in the development of the property) against certain tax consequences arising from a transaction involving one of four properties, which we refer to in this section as the protected assets.

First, this agreement provides that our operating partnership will not sell, exchange, transfer or otherwise dispose of such protected assets, or any interest in a protected asset, until (i) October 7, 2025, with respect to one protected asset, First Stamford Place, and (ii) the later of (x) October 7, 2021 and (y) the death of both Peter L. Malkin and Isabel W. Malkin, who are 85 and 82 years old, respectively, for the three other protected assets, Metro Center, 10 Bank Street and 1542 Third Avenue, unless:

(1)Anthony E. Malkin consents to the sale, exchange, transfer or other disposition; or

(2)we deliver to each protected party thereunder a cash payment intended to approximate the tax liability arising from the recognition of the pre-contribution built-in gain resulting from the sale, exchange, transfer or other disposition of such protected asset (with the pre-contribution “built-in gain” being not more than the taxable gain that would have been recognized by such protected party if the protected asset been sold for fair market value in a taxable transaction at the time of the consolidation) plus an additional amount so that, after the payment of all taxes on amounts received pursuant to the agreement (including any tax liability incurred as a result of receiving such payment), the protected party retains an amount equal to such protected party’s total tax liability incurred as a result of the recognition of the pre-contribution built-in gain pursuant to such sale, exchange, transfer or other disposition; or

(3)the disposition does not result in a recognition of any built-in gain by the protected party.

Second, with respect to the Malkin Group, including Anthony E. Malkin and Peter L. Malkin, and one additional third party investor in Metro Center (who was one of the original landowners and was involved in the development of the property), to protect against gain recognition resulting from a reduction in such continuing investor’s share of the operating partnership liabilities, the agreement provides that during the period from October 7, 2013 until such continuing investor owns less than the aggregate number of operating partnership units and shares of ESRT common stock equal to 50% of the aggregate number of such units and shares such investor received in the formation transactions, which we refer to in this section as the tax protection period, we will (i) refrain from prepaying any amounts outstanding under any indebtedness secured by the protected assets and (ii) use our commercially reasonable efforts to refinance such indebtedness at or prior to maturity at its current principal amount, or, if we are unable to refinance such indebtedness at its current principal amount, at the highest principal amount possible. The agreement also provides that, during the tax protection period, we will make available to such continuing investors the opportunity (i) to enter into a “bottom dollar” guarantee of their allocable share of $160.0 million of our aggregate indebtedness meeting certain requirements or (ii) in the event we have recourse debt outstanding and such a continuing investor agrees, in lieu of guaranteeing debt pursuant to clause (i) above, to enter into a deficit restoration obligation, in each case, in a manner intended to provide an allocation of our liabilities to the continuing investor. In the event that a continuing investor guarantees our debt, such continuing investor will be responsible, under certain circumstances, for the repayment of the guaranteed amount to the lender in the event that the lender would otherwise recognize a loss on the loan, such as, for example, if property securing the loan was foreclosed and the value was not sufficient to repay a certain amount of the debt. A deficit restoration obligation is a continuing investor’s obligation, under certain circumstances, to contribute a designated amount of capital to us upon our liquidation in the event that our assets are insufficient to repay our liabilities.

Because we expect that we will at all times have sufficient liabilities to allow us to meet our obligations to allocate liabilities to our partners that are protected parties under the tax protection agreement, our indemnification obligation with respect to “certain tax liabilities” would generally arise only in the event that we dispose in a taxable transaction of a protected asset within the period specified above in a taxable transaction. In the event of such a disposition, the amount of our indemnification obligation would depend on several factors, including the amount of “built-in gain,” if any, recognized and allocated to the indemnified partners with respect to such disposition and the effective tax rate to be applied to such gain at the time of such disposition.

Our partnership agreement requires that allocations with respect to such acquired property be made in a manner consistent with Section 704(c) of the Code. Treasury Regulations issued under Section 704(c) of the Code provide partnerships with a choice of several methods of allocating book-tax differences. Under the tax protection agreement, we have agreed to use the “traditional method” for accounting for book-tax differences for the properties acquired by us in the consolidation. Under the traditional method, which is the least favorable method from our perspective, the carryover basis of the acquired properties in our hands (i) may cause us to be allocated lower amounts of depreciation and other deductions for tax purposes than would be allocated to us if all of the acquired properties were to have a tax basis equal to their fair market value at the time of acquisition and (ii) in the event of a sale of such properties, could cause us to be allocated gain in excess of its corresponding economic or book gain (or taxable loss that is less than its economic or book loss), with a corresponding benefit to the partners transferring such properties to us for interests in us.

Registration Rights

We entered into a registration rights agreement with certain persons receiving shares of ESRT common stock or operating partnership units in the formation transactions, including certain members of ESRT's senior management team and our other continuing investors. In connection therewith, we have filed, and are obligated to maintain the effectiveness of, an automatically effective shelf registration statement, along with a prospectus supplement, with respect to, among other things, shares of ESRT Class A common stock that may be issued upon redemption of operating partnership units or issued upon conversion of shares of ESRT Class B common stock to continuing investors in the public existing entities. Pursuant to the registration rights agreement, under certain circumstances, ESRT will also be required to undertake an underwritten offering upon the written request of the Malkin Group, which we refer to as the holder, provided (i) the registrable shares to be registered in such offering will have a market value of at least $150.0 million, (ii) ESRT will not be obligated to effect more than two underwritten offerings during any 12-month period; and (iii) the holder will not have the ability to effect more than four underwritten offerings. In addition, if ESRT files a registration statement with respect to an underwritten offering for its own account or on behalf of the holder, the holder will have the right, subject to certain limitations, to register such number of registrable shares held by him, her or it as each such holder requests. With respect to underwritten offerings on behalf of the holder, ESRT will have the right to register such number of primary shares as it requests; provided, however, that if cut backs are required by the managing underwriters of such an offering, ESRT's primary shares shall be cutback first (but in no event will our shares be cut back to less than $25.0 million).

ESRT has also agreed to indemnify the persons receiving rights against specified liabilities, including certain potential liabilities arising under the Securities Act, or to contribute to the payments such persons may be required to make in respect thereof. ESRT has agreed to pay all of the expenses relating to the registration and any underwritten offerings of such securities, including, without limitation, all registration, listing, filing and stock exchange or FINRA fees, all fees and expenses of complying with securities or “blue sky” laws, all printing expenses and all fees and disbursements of counsel and independent public accountants retained by ESRT, but excluding underwriting discounts and commissions, any out-of-pocket expenses (except ESRT will pay any holder’s out-of-pocket fees (including disbursements of such holder’s counsel, accountants and other advisors) up to $25,000 in the aggregate for each underwritten offering and each filing of a resale shelf registration statement or demand registration statement), and any transfer taxes.

Employment Agreement and Change in Control Severance Agreements

ESRT entered into an employment agreement with Anthony E. Malkin, which provides for salary, bonuses and other benefits, including among other things, severance benefits upon a termination of employment under certain circumstances and the issuance of equity awards. In addition, ESRT entered into change in control severance agreements with Thomas P. Durels, David A. Karp, Thomas N. Keltner, Jr. and John B. Kessler.

Indemnification of Our Directors and Officers

We entered into indemnification agreements with each of ESRT's directors, executive officers, chairman emeritus and certain other parties, providing for the indemnification by us for certain liabilities and expenses incurred as a result of actions brought, or threatened to be brought, against (i) ESRT's directors, executive officers and chairman emeritus and (ii) ESRT's executive officers, chairman emeritus and certain other parties who are former members, managers, securityholders, directors, limited partners, general partners, officers or controlling persons of our predecessor in such capacities.

Excluded Properties and Businesses

The Malkin Group, including Anthony E. Malkin, our Chairman and Chief Executive Officer, owns non-controlling interests in, and Anthony E. Malkin and Peter L. Malkin control the general partners or managers of, the entities that own interests in eight multi-family properties, five net leased retail properties, (including one single tenant retail property in Greenwich, Connecticut), and a parcel that is being developed for residential use. The Malkin Group also owns non-controlling interests in one Manhattan office property, two Manhattan retail properties and several retail properties outside of Manhattan, none of which were contributed to us in the formation transactions. We refer to the non-controlling interests described above collectively as the excluded properties. In addition, the Malkin Group owns interests in two mezzanine and senior equity funds, an industrial fund, and five residential properties, and which we refer to collectively as the excluded businesses. Other than the Greenwich retail property, we do not believe that the excluded properties or the excluded businesses are consistent with our portfolio geographic or property type composition, management or strategic direction.

Pursuant to management and/or service agreements with the owners of interests in those excluded properties and services agreements with five residential property managers and the managers of certain other excluded businesses which historically were managed by affiliates of our predecessor, we are designated as the asset manager (supervisor) and/or property manager of the excluded properties and will provide services to the owners of certain of the excluded properties and the five residential property managers and provide services and access to office space to the existing managers of the other excluded businesses. As the manager or service provider, we are paid a management or other fee with respect to those excluded properties and excluded businesses where our predecessor had previously received a management fee on the same terms as the fee paid to our predecessor, and reimbursed for our costs in providing the management and other services to those excluded properties and businesses where our predecessor had not previously received a management fee. ESRT's management of the excluded properties and provision of services to the five residential property managers and the existing managers of the other excluded businesses represent a minimal portion of our overall business. There is no established time period in which we will manage such properties or provide services to the owners of certain of the excluded properties and the five residential property managers and provide services and access to office space to the existing managers of the other excluded businesses; and Peter L. Malkin and Anthony E. Malkin expect to sell certain properties or unwind these businesses over time. We are not precluded from acquiring all or certain interests in the excluded properties or businesses. If we were to attempt any such acquisition, we anticipate that Anthony E. Malkin, ESRT's Chairman and Chief Executive Officer, will not participate in the negotiation process on our behalf with respect to our potential acquisition of any of these excluded properties or businesses, and the approval of a majority of ESRT's independent directors will be required to approve any such acquisition.

Services are and were provided by us to excluded properties and businesses. These transactions are reflected in our consolidated statements of income as third-party management and other fees.

We earned asset management (supervisory) and service fees from excluded properties and businesses of $1.1 million, $1.1 million and $1.4 million during the years ended December 31, 2018, 2017 and 2016, respectively.

We earned property management fees from excluded properties of $0.3 million, $0.3 million and $0.4 million during the years ended December 31, 2018, 2017 and 2016, respectively.

Other

We were reimbursed at allocable cost for 647 square feet of shared office space, equipment, and administrative support shared with us in our corporate offices, as was done prior to our formation, and we received rent generally at market rental rate for 3,074 square feet of leased space, from entities affiliated with Anthony E. Malkin at one of our properties. Total revenue aggregated $0.2 million for the year ended December 31, 2016.

During August 2016, such entities moved from the previously shared office and leased spaces to relocate to a new 5,351 square foot leased space at one of our properties, paying rent generally at a market rental rate. Under such new lease, the tenant has the right to cancel such lease without special payment on 90 days’ notice. We now have a shared use agreement with such tenant, to occupy a portion of the leased premises as the office location for Peter L. Malkin, our chairman emeritus and employee, utilizing approximately 15% of the space, for which we pay an allocable pro rata share of the cost to such tenant. We also have agreements with these entities and excluded properties and businesses to provide them with general computer-related support. Total revenue aggregated $0.3 million, $0.4 million and $0.1 million for the years ended December 31, 2018, 2017 and 2016, respectively.

During 2016 and in connection with our office move, Peter L. Malkin purchased miscellaneous furniture and artwork from us at their appraised value of $23,300. Remaining office furniture was disposed.

One of our directors, James D. Robinson IV, is a general partner in an investment fund, which owns more than a 10% economic and voting interest in one of our tenants, OnDeck Capital, with an annualized rent of $4.5 million and $5.8 million as of December 31, 2018 and 2017, respectively.

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Income Taxes

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

TRS Holdings and Observatory TRS are taxable entities and their consolidated provision for income taxes consisted of the following for the years ended December 31, 2018, 2017 and 2016 (amounts in thousands):

	For the Year Ended December 31,
	2018			2017			2016
Current:
Federal	$	(2,389	)	$	(3,923	)	$	(3,632	)
State and local	(2,253		)	(2,304		)	(2,055		)
Total current	(4,642		)	(6,227		)	(5,687		)
Deferred:
Federal	—			(446		)	(291		)
State and local	—			—			(168		)
Total deferred	—			(446		)	(459		)
Income tax expense	$	(4,642	)	$	(6,673	)	$	(6,146	)

In December 2017, the Tax Cuts and Jobs Act (the “TCJA”) was enacted. The TCJA includes a number of changes to existing U.S. tax laws, most notably a reduction of the U.S. corporate income tax rate from 35 percent to 21 percent, effective January 1, 2018. We measure deferred tax assets using enacted tax rates that will apply in the years in which the temporary differences are expected to be recovered or paid. Accordingly, our deferred tax assets were remeasured to reflect the reduction in the U.S. corporate income tax rate, resulting in a $0.4 million increase in income tax expense for the year ended December 31, 2017 and a corresponding decrease of the same amount in our deferred assets as of December 31, 2017.

    The effective income tax rate is 34.0%, 48.5% and 44.8% for the years ended December 31, 2018, 2017 and 2016, respectively. The actual tax provision differed from that computed at the federal statutory corporate rate as follows (amounts in thousands):

	For the Year Ended December 31,
	2018			2017			2016
Federal tax expense at statutory rate	$	(2,844	)	$	(4,684	)	$	(4,629	)
State income taxes, net of federal benefit	(1,798		)	(1,543		)	(1,517		)
Corporate income tax rate adjustment	—			(446		)	—
Income tax expense	$	(4,642	)	$	(6,673	)	$	(6,146	)

The income tax effects of temporary differences that give rise to deferred tax assets are presented below as of December 31, 2018, 2017 and 2016 (amounts in thousands):

	2018		2017		2016
Deferred tax assets:
Deferred revenue on unredeemed observatory admission ticket sales	$	1,396	$	1,395	$	198

Deferred tax assets at December 31, 2018, 2017 and 2016, respectively, are attributable to the inclusion of deferred revenue on Observatory admission ticket sales not redeemed at year-end in determining income for tax reporting purposes and are included in prepaid expenses and other assets on the consolidated balance sheets. No valuation allowance has been recorded against the deferred tax asset because the Company believes that the deferred tax asset will, more likely than not, be realized. This determination is based on the Observatory TRS’s anticipated future taxable income and the reversal of the deferred tax asset.

At December 31, 2018, 2017 and 2016, the TRS entities have no amount of unrecognized tax benefits. For tax years 2018, 2017, 2016 and 2015, the United States federal and state tax returns are open for examination.

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Segment Reporting

12 Months Ended

Dec. 31, 2018

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, repositioning and disposition of our real estate assets. Our observatory segment operates 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 different marketing strategies. We account for intersegment sales and rents as if the sales or rents were to third parties, that is, at current market prices.

The following tables provide components of segment profit for each segment for the years ended December 31, 2018, 2017 and 2016, as reviewed by management (amounts in thousands):

	2018
	Real Estate			Observatory			Intersegment Elimination			Total
Revenues:
Rental revenue	$	493,231		$	—		$	—		$	493,231
Intercompany rental revenue	79,954			—			(79,954		)	—
Tenant expense reimbursement	72,372			—			—			72,372
Observatory revenue	—			131,227			—			131,227
Lease termination fees	20,847			—			—			20,847
Third-party management and other fees	1,440			—			—			1,440
Other revenue and fees	12,394			—			—			12,394
Total revenues	680,238			131,227			(79,954		)	731,511
Operating expenses:
Property operating expenses	167,379			—			—			167,379
Intercompany rent expense	—			79,954			(79,954		)	—
Ground rent expense	9,326			—			—			9,326
General and administrative expenses	52,674			—			—			52,674
Observatory expenses	—			32,767			—			32,767
Real estate taxes	110,000			—			—			110,000
Depreciation and amortization	168,430			78			—			168,508
Total operating expenses	507,809			112,799			(79,954		)	540,654
Total operating income	172,429			18,428			—			190,857
Other income (expense):
Interest income	10,661			—			—			10,661
Interest expense	(79,623		)	—			—			(79,623		)
Income before income taxes	103,467			18,428			—			121,895
Income tax expense	(1,114		)	(3,528		)	—			(4,642		)
Net income	$	102,353		$	14,900		$	—		$	117,253
Segment assets	$	3,930,330		$	265,450		$	—		$	4,195,780
Expenditures for segment assets	$	201,685		$	54,811		$	—		$	256,496

	2017
	Real Estate			Observatory			Intersegment Elimination			Total
Revenues:
Rental revenue	$	483,944		$	—		$	—		$	483,944
Intercompany rental revenue	77,646			—			(77,646		)	—
Tenant expense reimbursement	73,679			—			—			73,679
Observatory revenue	—			127,118			—			127,118
Lease termination fees	13,551			—			—			13,551
Third-party management and other fees	1,400			—			—			1,400
Other revenue and fees	9,834			—			—			9,834
Total revenues	660,054			127,118			(77,646		)	709,526
Operating expenses:
Property operating expenses	163,531			—			—			163,531
Intercompany rent expense	—			77,646			(77,646		)	—
Ground rent expense	9,326			—			—			9,326
General and administrative expenses	50,315			—			—			50,315
Observatory expenses	—			30,275			—			30,275
Real estate taxes	102,466			—			—			102,466
Depreciation and amortization	160,630			80			—			160,710
Total operating expenses	486,268			108,001			(77,646		)	516,623
Total operating income (loss)	173,786			19,117			—			192,903
Other income (expense):
Interest income	2,942			—			—			2,942
Interest expense	(68,473		)	—			—			(68,473		)
Loss on early extinguishment of debt	(2,157		)	—			—			(2,157		)
Loss from derivative financial instrument	(289		)	—			—			(289		)
Income before income taxes	105,809			19,117			—			124,926
Income tax expense	(1,306		)	(5,367		)	—			(6,673		)
Net income	$	104,503		$	13,750		$	—		$	118,253
Segment assets	$	3,670,907		$	260,440		$	—		$	3,931,347
Expenditures for segment assets	$	191,541		$	36,621		$	—		$	228,162

	2016
	Real Estate			Observatory			Intersegment Elimination			Total
Revenues:
Rental revenue	$	460,653		$	—		$	—		$	460,653
Intercompany rental revenue	75,658			—			(75,658		)	—
Tenant expense reimbursement	73,459			—			—			73,459
Observatory revenue	—			124,814			—			124,814
Lease termination fees	7,676			—			—			7,676
Third-party management and other fees	1,766			—			—			1,766
Other revenue and fees	8,970			15			—			8,985
Total revenues	628,182			124,829			(75,658		)	677,353
Operating expenses:
Property operating expenses	153,850			—			—			153,850
Intercompany rent expense	—			75,658			(75,658		)	—
Ground rent expense	9,326			—			—			9,326
General and administrative expenses	49,078			—			—			49,078
Observatory expenses	—			29,833			—			29,833
Real estate taxes	96,061			—			—			96,061
Acquisition expenses	98			—			—			98
Depreciation and amortization	154,817			394			—			155,211
Total operating expenses	463,230			105,885			(75,658		)	493,457
Total operating income (loss)	164,952			18,944			—			183,896
Other income (expense):
Interest income	647			—			—			647
Interest expense	(70,595		)	—			—			(70,595		)
Loss on early extinguishment of debt	(552		)	—			—			(552		)
Income (loss) before income taxes	94,452			18,944			—			113,396
Income tax expense	(1,361		)	(4,785		)	—			(6,146		)
Net income	$	93,091		$	14,159		$	—		$	107,250
Segment assets	$	3,641,844		$	249,109		$	—		$	3,890,953
Expenditures for segment assets	$	197,680		$	—		$	—		$	197,680

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Summary of Quarterly Financial Information (unaudited)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Summary of Quarterly Financial Information (unaudited)

Summary of Quarterly Financial Information (unaudited)

The quarterly results of operations of our company for the years ended December 31, 2018, 2017 and 2016 are as follows (amounts in thousands):

	March 31, 2018		June 30, 2018		September 30, 2018		December 31, 2018
Revenues	$	167,271	$	178,529	$	186,402	$	199,309
Operating income	$	34,164	$	49,665	$	48,538	$	58,490
Net income	$	18,058	$	30,184	$	29,230	$	39,781
Net income attributable to common unitholders	$	17,824	$	29,950	$	28,996	$	39,547
Net income per share attributable to common unitholders:
Basic and diluted	$	0.06	$	0.10	$	0.10	$	0.13
	March 31, 2017		June 30, 2017		September 30, 2017		December 31, 2017
Revenues	$	164,333	$	176,349	$	186,547	$	182,297
Operating income	$	36,045	$	50,659	$	56,008	$	50,191
Net income	$	19,145	$	31,359	$	35,489	$	32,260
Net income attributable to common unitholders	$	18,911	$	31,125	$	35,255	$	32,026
Net income per share attributable to common unitholders:
Basic and diluted	$	0.06	$	0.10	$	0.12	$	0.11
	March 31, 2016		June 30, 2016		September 30, 2016		December 31, 2016
Revenues	$	157,057	$	165,785	$	175,704	$	178,807
Operating income	$	34,097	$	44,162	$	53,442	$	52,195
Net income	$	16,705	$	24,640	$	32,897	$	33,008
Net income attributable to common unitholders	$	16,471	$	24,406	$	32,663	$	32,774
Net income per share attributable to common unitholders:
Basic and diluted	$	0.06	$	0.09	$	0.12	$	0.11

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Subsequent Events

12 Months Ended

Dec. 31, 2018

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

None.

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Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2018

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Schedule II - Valuation and Qualifying Accounts

Schedule II—Valuation and Qualifying Accounts

(amounts in thousands)

Description	Balance At Beginning of Year		Additions Charged Against Operations			Uncollectible Accounts Written-Off			Balance at End of Year
Year ended December 31, 2018
Allowance for doubtful accounts	$	1,607	$	(811	)	$	(289	)	$	507
Year ended December 31, 2017
Allowance for doubtful accounts	$	3,723	$	(1,650	)	$	(466	)	$	1,607
Year ended December 31, 2016
Allowance for doubtful accounts	$	3,037	$	908		$	(222	)	$	3,723

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Schedule III - Real Estate and Accumulated Depreciation

12 Months Ended

Dec. 31, 2018

SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]

Schedule III - Real Estate and Accumulated Depreciation

Schedule III—Real Estate and Accumulated Depreciation

(amounts in thousands)

				Initial Cost to the Company				Cost Capitalized Subsequent to Acquisition				Gross Amount at which Carried at 12/31/18
Development	Type	Encumbrances		Land		Building & Improvements		Improvements		Carrying Costs		Land		Buildings & Improvements		Total		Accumulated Depreciation			Date of Construction	Date Acquired	Life on which depreciation in latest income statement is computed
111 West 33rd Street, New York, NY	office / retail	$	—	$	13,630	$	244,461	$	106,780	n/a		$	13,630	$	351,241	$	364,871	$	(41,629	)	1954	2014	various
1400 Broadway, New York, NY	office / retail	—		—		96,338		40,261		—		—		136,599		136,599		(31,601		)	1930	2014	various
1333 Broadway, New York, NY	office / retail	158,484		91,435		120,190		7,491		n/a		91,435		127,681		219,116		(22,331		)	1915	2013	various
1350 Broadway, New York, NY	office / retail	—		—		102,518		27,161		—		—		129,679		129,679		(25,312		)	1929	2013	various
250 West 57th Street, New York, NY	office/ retail	—		2,117		5,041		141,581		n/a		2,117		146,622		148,739		(36,058		)	1921	1953	various
501 Seventh Avenue, New York, NY	office/ retail	—		1,100		2,600		94,778		n/a		1,100		97,378		98,478		(43,164		)	1923	1950	various
1359 Broadway, New York, NY	office/ retail	—		1,233		1,809		57,938		n/a		1,233		59,747		60,980		(26,549		)	1924	1953	various
350 Fifth Avenue (Empire State Building), New York, NY	office/ retail	—		21,551		38,934		895,989		n/a		21,551		934,923		956,474		(211,068		)	1930	2013	various
One Grand Central Place, New York, NY	office/ retail	—		7,240		17,490		241,218		n/a		7,222		258,726		265,948		(109,502		)	1930	1954	various
First Stamford Place, Stamford, CT	office	178,616		22,952		122,739		63,292		n/a		24,862		184,121		208,983		(78,570		)	1986	2001	various
One Station Place, Stamford, CT (Metro Center)	office	91,592		5,313		28,602		15,301		n/a		5,313		43,903		49,216		(30,763		)	1987	1984	various
383 Main Avenue, Norwalk, CT	office	29,614		2,262		12,820		22,253		n/a		2,262		35,073		37,335		(12,876		)	1985	1994	various
500 Mamaroneck Avenue, Harrison, NY	office	—		4,571		25,915		22,198		n/a		4,571		48,113		52,684		(23,147		)	1987	1999	various
10 Bank Street, White Plains, NY	office	33,316		5,612		31,803		18,412		n/a		5,612		50,215		55,827		(21,134		)	1989	1999	various
10 Union Square, New York, NY	retail	49,116		5,003		12,866		1,966		n/a		5,003		14,832		19,835		(7,801		)	1987	1996	various
1542 Third Avenue, New York, NY	retail	29,459		2,239		15,266		425		n/a		2,239		15,691		17,930		(7,774		)	1991	1999	various
1010 Third Avenue, New York, NY and 77 West 55th Street, New York, NY	retail	38,370		4,462		15,817		783		n/a		4,462		16,600		21,062		(8,590		)	1962	1998	various
69-97 Main Street, Westport, CT	retail	—		2,782		15,766		1,046		n/a		2,782		16,812		19,594		(7,113		)	1922	2003	various
103-107 Main Street, Westport, CT	retail	—		1,243		7,043		321		n/a		1,260		7,347		8,607		(2,322		)	1900	2006	various
Property for development at the Transportation Hub in Stamford, CT	land	—		4,542		—		7,987		—		12,529		—		12,529		—			n/a	n/a	n/a
Totals		$	608,567	$	199,287	$	918,018	$	1,767,181	$	—	$	209,183	$	2,675,303	$	2,884,486	$	(747,304	)

Empire State Realty OP, L.P.

Notes to Schedule III—Real Estate and Accumulated Depreciation

(amounts in thousands)

1. Reconciliation of Investment Properties

The changes in our investment properties for the years ended December 31, 2018, 2017 and 2016 are as follows:

	2018			2017			2016
Balance, beginning of year	$	2,667,655		$	2,458,629		$	2,276,330
Acquisition of new properties	—			—			—
Improvements	256,496			228,162			197,680
Disposals	(39,665		)	(19,136		)	(15,381		)
Balance, end of year	$	2,884,486		$	2,667,655		$	2,458,629

The unaudited aggregate cost of investment properties for federal income tax purposes as of December 31, 2018 was $2.5 billion.

2. Reconciliation of Accumulated Depreciation

The changes in our accumulated depreciation for the years ended December 31, 2018, 2017 and 2016 are as follows:

	2018			2017			2016
Balance, beginning of year	$	656,900		$	556,546		$	465,584
Depreciation expense	130,069			119,490			106,343
Disposals	(39,665		)	(19,136		)	(15,381		)
Balance, end of year	$	747,304		$	656,900		$	556,546

Depreciation of investment properties reflected in the combined statements of income is calculated over the estimated original lives of the assets as follows:

Buildings	39 years
Building improvements	39 years or useful life
Tenant improvements	Term of related lease

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Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Basis of Presentation and Principles of Consolidation

Basis of Presentation and Principles of Consolidation

The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and with the rules and regulations of the Securities and Exchange Commission (the "SEC") represent our assets and liabilities and operating results. The consolidated financial statements include our accounts and our wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.

Consolidation, 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 December 31, 2018 and 2017.

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 consolidated balance sheets and in the 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 consolidated financial statements in accordance with GAAP requires management to use estimates and assumptions that in certain circumstances affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities, and the reported revenues and expenses. Significant items subject to such estimates and assumptions include allocation of the purchase price of acquired real estate properties among tangible and intangible assets, determination of the useful life of real estate properties and other long-lived assets, valuation and impairment analysis of commercial real estate properties and other long-lived assets, estimate of tenant expense reimbursements, 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 notes, unsecured revolving credit and term loan 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.

Revenue Recognition

Revenue Recognition

Rental Revenue

Rental revenue includes base rents that each tenant pays in accordance with the terms of its respective lease and is reported on a straight-line basis over the non-cancellable term of the lease which includes the effects of rent steps and rent abatements under the leases. In general, we commence rental revenue recognition when the tenant takes possession of the leased space or controls the physical use of the leased space and the leased space is substantially ready for its intended use. We account for all of our leases as operating leases. Deferred rent receivables, including free rental periods and leasing arrangements allowing for increased base rent payments, are accounted for in a manner that provides an even amount of fixed lease revenues over the respective non-cancellable lease terms. Differences between rental income recognized and amounts due under the respective lease agreements are recognized as an increase or decrease to deferred rent receivables.

In addition to base rent, our tenants also generally will pay their pro rata share of increases in real estate taxes and operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in building operating expenses, the tenant will pay additional rent based upon increases in an index such as the Consumer Price Index over the index value in effect during a base year, or contain fixed percentage increases over the base rent to cover escalations.

We will recognize rental revenue of acquired in-place above- and below-market leases at their fair values over the terms of the respective leases, including, for below-market leases, fixed option renewal periods, if any.

Lease termination fees are recognized when the fees are determinable, tenant vacancy has occurred, collectability is reasonably assured, we have no continuing obligation to provide services to such former tenants and the payment is not subject to any conditions that must be met or waived.

Observatory Revenue

Revenues from the sale of Observatory tickets are recognized upon admission or ticket expirations. Deferred revenue related to unused and unexpired tickets as of December 31, 2018 and 2017 was $4.1 million and $4.1 million, respectively, and is included in deferred revenue and other liabilities on the consolidated balance sheets.

Gains on Sale of Real Estate

We record a gain on sale of real estate when title is conveyed to the buyer and we have no substantial economic involvement with the property. If the sales criteria for the full accrual method are not met, we defer some or all of the gain recognition and account for the continued operations of the property by applying the finance, leasing, profit sharing, deposit, installment or cost recovery methods, as appropriate, until the sales criteria are met.

Third-Party Management and Other Fees

We earn revenue arising from contractual agreements with related party entities for asset and property management services. This revenue is recognized as the related services are performed under the respective agreements in place.

Other Revenue and Fees

Other Revenues and Fees

Other revenues and fees includes parking income, percentage rent, legal, tax and insurance settlements, demand response energy use earnings and sales from our restaurant at the Empire State Building.

Advertising and Marketing Costs

Advertising and Marketing Costs

Advertising and marketing costs are expensed as incurred.

Real Estate Properties and Related Intangible Assets

Real Estate Properties and Related Intangible Assets

Land and buildings and improvements are recorded at cost less accumulated depreciation and amortization. The recorded cost includes cost of acquisitions, development and construction and tenant allowances and improvements. Expenditures for ordinary repairs and maintenance are charged to property operating expense as incurred. Significant replacements and betterments which improve or extend the life of the asset are capitalized. Tenant improvements which improve or extend the life of the asset are capitalized. If a tenant vacates its space prior to the contractual termination of its lease, the unamortized balance of any tenant improvements are written off if they are replaced or have no future value. For developed properties, direct and indirect costs that clearly relate to projects under development are capitalized. Costs include construction costs, professional services such as architectural and legal costs, capitalized interest and direct payroll costs. We begin capitalization when the project is probable. The assets relating to the project are stated at cost and are not depreciated. Once construction is completed and the assets are placed in service, the assets are reclassified to the appropriate asset class and depreciated in accordance with the useful lives as indicated below. Capitalization of interest ceases when the asset is ready for its intended use, which is generally near the date that a certificate of occupancy is obtained. Total capitalized interest for the years ended December 31, 2018 and 2017 was $1.6 million and $0.5 million, respectively. There was no capitalized interest for the year ended December 31, 2016.

Depreciation and amortization are computed using the straight-line method for financial reporting purposes. Buildings and improvements are depreciated over the shorter of 39 years, the useful life, or the remaining term of any leasehold interest. Tenant improvement costs, which are included in building and improvements in the consolidated balance sheets, are depreciated over the shorter of (i) the related remaining lease term or (ii) the life of the improvement. Corporate equipment, which is included in “Other assets,” is depreciated over three to seven years.

Acquisitions of properties are accounted for utilizing the acquisition method and accordingly the purchase cost is allocated to tangible and intangible assets and liabilities based on their fair values. The fair value of tangible assets acquired is determined by valuing the property as if it were vacant, applying methods similar to those used by independent appraisers of income-producing property. The resulting value is then allocated to land, buildings and improvements, and tenant improvements based on our determination of the fair value of these assets. The assumptions used in the allocation of fair values to assets acquired are based on our best estimates at the time of evaluation.

Fair value is assigned to above-market and below-market leases based on the difference between (a) the contractual amounts to be paid by the tenant based on the existing lease and (b) our estimate of current market lease rates for the corresponding in-place leases, over the remaining terms of the in-place leases. Capitalized above-market lease amounts are amortized as a decrease to rental revenue over the remaining terms of the respective leases. Capitalized below-market lease amounts are amortized as an increase to rental revenue over the remaining terms of the respective leases. If a tenant vacates its space prior to the contractual termination of the lease and no rental payments are being made on the lease, any unamortized balance of the related intangible will be written off.

The aggregate value of other acquired intangible assets consists of acquired ground leases and acquired in-place leases and tenant relationships. The fair value allocated to acquired in-place leases consists of a variety of components including, but not necessarily limited to: (a) the value associated with avoiding the cost of originating the acquired in-place leases (i.e. the market cost to execute a lease, including leasing commissions and legal fees, if any); (b) the value associated with lost revenue related to tenant reimbursable operating costs estimated to be incurred during the assumed lease-up period (i.e. real estate taxes, insurance and other operating expenses); (c) the value associated with lost rental revenue from existing leases during the assumed lease-up period; and (d) the value associated with any other inducements to secure a tenant lease.

We assess the potential for impairment of our long-lived assets, including real estate properties, annually or whenever events occur or a change in circumstances indicate that the recorded value might not be fully recoverable. We determine whether impairment in value has occurred by comparing the estimated future undiscounted cash flows expected from the use and eventual disposition of the asset to its carrying value. If the undiscounted cash flows do not exceed the carrying value, the real estate is adjusted to fair value and an impairment loss is recognized. Assets held for sale are recorded at the lower of cost or fair value less costs to sell. We do not believe that the value of any of our properties and intangible assets were impaired during the years ended December 31, 2018, 2017 and 2016.

Cash and Cash Equivalents and Restricted Cash

Cash and Cash Equivalents

Cash and cash equivalents consist of cash on hand, government money markets, demand deposits with financial institutions and short-term liquid investments with original maturities of three months or less when purchased. Cash and cash equivalents held at major commercial banks may at times exceed the Federal Deposit Insurance Corporation limit. To date, we have not experienced any losses on our invested cash.

Restricted Cash

Restricted cash consists of amounts held for tenants in accordance with lease agreements such as security deposits and amounts held by lenders and/or escrow agents to provide for future real estate tax expenditures and insurance expenditures, tenant vacancy related costs and debt service obligations.

Short-term Investments

Short-term Investments

Short-term investments include time deposits with original maturities of greater than three months and remaining

maturities of less than one year.

Tenant and Other Receivables

Tenant and Other Receivables

Tenant and other receivables, other than deferred rent receivable, are generally expected to be collected within one year.

Allowance for Doubtful Accounts

Allowance for Doubtful Accounts

We maintain an allowance against tenant and other receivables and deferred rents receivables for future potential tenant credit losses. The credit assessment is based on the estimated accrued rental revenue that is recoverable over the term of the respective lease. The computation of this allowance is based on the tenants’ payment history and current credit status. If our estimate of collectability differs from the cash received, then the timing and amount of our reported revenue could be impacted. Bad debt expense is included in operating expenses on our consolidated statements of income and includes the impact of changes in the allowance for doubtful accounts on our consolidated balance sheets.

Deferred Leasing Costs and Deferred Financing Costs

Deferred Leasing Costs

Deferred leasing costs consist of fees and direct costs incurred to initiate and renew leases, are amortized on a straight-line basis over the related lease term and the expense is included in depreciation and amortization in our consolidated statements of income. Upon the early termination of a lease, unamortized deferred leasing costs are charged to expense.

Deferred Financing Costs

Fees and costs incurred to obtain long-term financing have been deferred and are amortized as a component of interest expense in our consolidated statements of income over the life of the respective long-term financing on the straight-line method which approximates the effective interest method. Unamortized deferred financing costs are expensed when the associated debt is refinanced or repaid before maturity. Costs incurred in seeking debt, which do not close, are expensed in the period in which it is determined that the financing will not close.

Equity Method Investments

Equity Method Investments

We account for investments under the equity method of accounting where we do not have control but have the ability to exercise significant influence. Under this method, investments are recorded at cost, and the investment accounts are adjusted for our share of the entities’ income or loss and for distributions and contributions. Equity income (loss) is allocated based on the portion of the ownership interest that is controlled by us. The agreements may designate different percentage allocations among investors for profits and losses; however, our recognition of the entity’s income or loss generally follows the entity’s distribution priorities, which may change upon the achievement of certain investment return thresholds.

To the extent that we contributed assets to an entity, our investment in the entity is recorded at cost basis in the assets that were contributed to the entity. Upon contributing assets to an entity, we make a judgment as to whether the economic substance of the transaction is a sale. If so, gain or loss is recognized on the portion of the asset to which the other partners in the entity obtain an interest.

To the extent that the carrying amount of these investments on our combined balance sheets is different than the basis reflected at the entity level, the basis difference would be amortized over the life of the related asset and included in our share of equity in net income of the entity.

On a periodic basis, we assess whether there are any indicators that the carrying value of our investments in entities may be impaired on an other than temporary basis. An investment is impaired only if management’s estimate of the fair value of the investment is less than the carrying value of the investment on an other than temporary basis. To the extent impairment has occurred, the loss shall be measured as the excess of the carrying value of the investment over the fair value of the investment.

As of December 31, 2018 and 2017, we had no equity method investments.

Goodwill

Goodwill

Goodwill is tested annually for impairment and is tested for impairment more frequently if events and circumstances indicate that the asset might be impaired. An impairment loss is recognized to the extent that the carrying amount, including goodwill, exceeds the reporting unit’s fair value and the implied fair value of goodwill is less than the carrying amount of that goodwill. Non-amortizing intangible assets, such as trade names and trademarks, are subject to an annual impairment test based on fair value and amortizing intangible assets are tested whenever events or changes in circumstances indicate that the carrying amount may not be recoverable.

Fair Value

Fair Value

Fair value is a market-based measurement, not an entity-specific measurement, and should be determined based on the assumptions that market participants would use in pricing the asset or liability. As a basis for considering market participant assumptions in fair value measurements, the Financial Accounting Standards Board ("FASB") guidance establishes a fair value hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity (observable inputs that are classified within levels one and two of the hierarchy) and the reporting entity's own assumptions about market participant assumptions (unobservable inputs classified within Level 3 of the hierarchy).

The methodologies used for valuing financial instruments have been categorized into three broad levels as follows:

Level 1 - Quoted prices in active markets for identical instruments.

Level 2 - Valuations based principally on other observable market parameters, including:

• Quoted prices in active markets for similar instruments;

• Quoted prices in less active or inactive markets for identical or similar instruments;

• Other observable inputs (such as risk free interest rates, yield curves, volatilities, prepayment speeds, loss severities, credit risks and default rates); and

• Market corroborated inputs (derived principally from or corroborated by observable market data).

Level 3 - Valuations based significantly on unobservable inputs, including:

• Valuations based on third-party indications (broker quotes or counterparty quotes) which were, in turn, based significantly on unobservable inputs or were otherwise not supportable; and

• Valuations based on internal models with significant unobservable inputs.

These levels form a hierarchy. We follow this hierarchy for our financial instruments measured or disclosed at fair value on a recurring and nonrecurring basis and other required fair value disclosures. The classifications are based on the lowest level of input that is significant to the fair value measurement.

We use the following methods and assumptions in estimating fair value disclosures for financial instruments.

Cash and cash equivalents, restricted cash, short term investments, tenant and other receivables, prepaid expenses and other assets, deferred revenue, tenant security deposits, accounts payable and accrued expenses carrying values approximate their fair values due to the short term maturity of these instruments.

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

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

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

Derivative Instruments

Derivative Instruments

We are exposed to the effect of interest rate changes and manage these risks by following policies and procedures including the use of derivatives. To manage exposure to interest rates, derivatives are used primarily to fix the rate on debt based on floating-rate indices. We also hedge exposure to the variability in future cash flows for forecast transactions over a maximum period of 11 months (excluding forecast transactions related to the payment of variable interest on existing financial instruments). We record all derivatives on the balance sheet at fair value. We incorporate credit valuation adjustments to appropriately reflect both our own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. We measure the credit risk of our derivative instruments that are subject to master netting agreements on a net basis by counterparty portfolio. For derivatives that qualify as cash flow hedges, we report the gain or loss on the derivative designated as a hedge as part of other comprehensive income (loss) and subsequently reclassify the gain or loss into income in the period that the hedged transaction affects income.

Income Taxes

Income Taxes

We are generally not subject to federal and state income taxes as our taxable income or loss is reportable by our partners. Accordingly, no provision has been made for federal and state income taxes. ESRT has elected, together with ESRT Observatory TRS, L.L.C., our subsidiary which holds our observatory operations, to treat ESRT Observatory TRS, L.L.C. as a TRS. ESRT has elected, together with ESRT Holdings TRS, L.L.C., our subsidiary that holds our third party management, restaurant, cafeteria, health clubs and certain cleaning operations, to treat ESRT Holdings TRS, L.L.C. as a TRS. TRSs may participate in non-real estate activities and/or perform non-customary services for tenants and their operations are generally subject to regular corporate income taxes. Our TRSs account for their income taxes in accordance with GAAP, which includes an estimate of the amount of taxes payable or refundable for the current year and deferred tax liabilities and assets for the future tax consequences of events that have been recognized in our financial statements or tax returns. The calculation of the TRSs' tax provisions may require interpreting tax laws and regulations and could result in the use of judgments or estimates which could cause its recorded tax liability to differ from the actual amount due. Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. The TRSs periodically assess the realizability of deferred tax assets and the adequacy of deferred tax liabilities, including the results of local, state, or federal statutory tax audits or estimates and judgments used.

We apply provisions for measuring and recognizing tax benefits associated with uncertain income tax positions. Penalties and interest, if incurred, would be recorded as a component of income tax expense. As of December 31, 2018 and 2017, we do not have a liability for uncertain tax positions. As of December 31, 2018, the tax years ended December 31, 2015 through December 31, 2018 remain open for an audit by the Internal Revenue Service, state or local authorities.

Share-Based Compensation

Share-Based Compensation

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. The determination of fair value of these awards is subjective and involves significant estimates and assumptions including expected volatility of ESRT stock, expected dividend yield, expected term, and assumptions of whether these awards will achieve parity with other operating partnership units or achieve performance thresholds. We believe that the assumptions and estimates utilized are appropriate based on the information available to management at the time of grant.

Per Unit Data

Per Unit Data

Basic and diluted earnings per unit are computed based upon the weighted average number of shares outstanding during the respective period.

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, repositioning and disposition of our real estate assets. Our observatory segment operates 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 different marketing strategies. We account for intersegment sales and rent as if the sales or rent were to third parties, that is, at current market prices.

Reclassification

Reclassification

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

Recently Issued or Adopted Accounting Standards

Recently Issued or Adopted Accounting Standards

During August 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2018-15, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (a consensus of the FASB Emerging Issues Task Force), which contain amendments that align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal use software license). Accordingly, for entities in a hosting arrangement that is a service contract, costs for implementation activities in the application development stage are capitalized depending on the nature of the costs, while costs incurred during the preliminary project and post-implementation stages are expensed as the activities are performed. The amendments in ASU No. 2018-15 also require the entity (customer) to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement. The amendments are effective for public business entities for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption of the amendments is permitted, including adoption in any interim period. The amendments in ASU No. 2018-15 should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

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

During January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business, which contain amendments to clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The amendments in ASU No. 2017-01 provide a screen to determine when an integrated set of assets and activities (collectively referred to as a “set”) is not a business. The screen requires that when substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. This screen reduces the number of transactions that need to be further evaluated. If the screen is not met, the amendments (1) require that to be considered a business, a set must include, at a minimum, an input and a substantive process that together significantly contribute to the ability to create output and (2) remove the evaluation of whether a market participant could replace missing elements. The amendments provide a framework to assist entities in evaluating whether both an input and a substantive process are present. Additionally, these amendments narrow the definition of the term output so that the term is consistent with how outputs are described in Topic 606, Revenue from Contracts with Customers. ASU No. 2017-01 will be effective for annual periods beginning after December 15, 2017, including interim periods within those periods. The amendments should be applied prospectively on or after the effective date. No disclosures are required at transition. We believe that future acquisitions of real estate properties will be considered asset acquisitions.

During November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, which contain amendments that require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. ASU No. 2016-18 will be effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. The amendments should be applied using a retrospective transition method to each period presented. We adopted this standard on January 1, 2018 using a retrospective transition method. The adoption did not have a material impact on our consolidated financial statements.

During August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. ASU No. 2016-15 will be effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Earlier adoption is permitted including adoption in an interim period. We adopted this standard on January 1, 2018 using a retrospective transition method. The adoption did not have a material impact 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. During November 2018, the FASB issued ASU No. 2018-19 Codification Improvements to Topic 326, Financial Instruments—Credit Losses which contain amendments relating to the transition and effective date requirements for nonpublic business entities and also clarified that receivables arising from operating leases are not within the scope of Subtopic 326-20, Financial Instruments—Credit Losses—Measured at Amortized Cost. ASU No. 2016-13 and ASU No. 2018-19 will be effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Earlier adoption as of the fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, is permitted. The amendments must be adopted through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective (that is, a modified retrospective approach). We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

During February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which requires that a lessee recognize in the statement of financial position a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. ASU No. 2016-02 leaves the accounting for leases by lessors largely unchanged from previous GAAP. ASU No. 2016-02 will be effective for fiscal years beginning after December 15, 2018 and subsequent interim periods. The new standard must be adopted using a modified retrospective transition, and provides for certain practical expedients. Transition will require application of the new guidance at the beginning of the earliest comparative period presented. This ASU is expected to result in the recognition of a right-to-use asset and related liability to account for our future obligations under our ground lease agreements for which we are the lessee. As of December 31, 2018, the remaining contractual payments under our ground lease agreements aggregated $75.9 million. In addition, under ASU 2016-02, lessors may only capitalize incremental direct leasing costs. As a result, we expect that we will no longer capitalize our non-contingent leasing costs and instead will expense these costs as incurred. These costs totaled $4.6 million for the year ended December 31, 2018. During July 2018, the FASB issued ASU No. 2018-10, Codification Improvements to Topic 842, Leases, which contains amendments which are intended to clarify or to correct unintended application of ASU No. 2016-02. Also during July 2018, the FASB issued ASU No. 2018-11, Targeted Improvements to Topic 842, Leases, which provides another transition method in addition to the existing modified retrospective transition method by allowing a cumulative effect adjustment to the opening balance of retained earnings in the period of adoption. The amendments in ASU No. 2018-11 also provide lessors with a practical expedient, by class of underlying asset, to not separate nonlease components from the associated lease component provided that (1) the timing and pattern of transfer are the same for the nonlease components and associated lease component and (2) the lease component, if accounted separately, would be classified as an operating lease. During December 2018, the FASB issued ASU No. 2018-20, Narrow-Scope Improvements for Lessors that contain amendments to further help lessors apply ASU No. 2016-02, including amendments that require lessors to (1) exclude lessor costs paid directly by lessees to third parties on the lessor's behalf from variable payments and therefore variable lease revenue and (2) include lessor costs that are paid by the lessor and reimbursed by the lessee in the measurement of variable lease revenue and the associated expense. For entities that have not yet adopted ASU No. 2016-02, the effective dates and transition requirements for ASU No. 2018-10, ASU No. 2018-11 and ASU No. 2018-20 will be the same as the effective date and transition requirements in ASU No. 2016-02. We adopted this standard on January 1, 2019 and elected the available practical expedients. ASU 2016-02 and its related amendments resulted in the recognition of right-of-use assets and lease liabilities for our operating leases on our balance sheet of approximately $30.0 million, but did not have an impact on our consolidated statements of income.

During May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which replaces all current GAAP guidance related to revenue recognition and eliminates 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. We adopted this standard on January 1, 2018 and it did not have a material impact on our consolidated financial statements.

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Deferred Costs, Acquired Lease Intangibles and Goodwill (Tables)

12 Months Ended

Dec. 31, 2018

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

Schedule of Deferred Costs, Net

Deferred costs, net, consisted of the following at December 31, 2018 and 2017 (amounts in thousands):

	2018			2017
Leasing costs	$	178,120		$	164,751
Acquired in-place lease value and deferred leasing costs	214,550			237,364
Acquired above-market leases	52,136			67,415
	444,806			469,530
Less: accumulated amortization	(209,839		)	(215,102		)
Total deferred costs, net, excluding net deferred financing costs	$	234,967		$	254,428

Deferred financing costs, net, consisted of the following at December 31, 2018 and 2017 (amounts in thousands):     

	2018			2017
Financing costs	$	25,315		$	24,446
Less: accumulated amortization	(10,027		)	(7,039		)
Total deferred financing costs, net	$	15,288		$	17,407

Schedule of Amortizing Acquired Intangible Assets and Liabilities

Amortizing acquired intangible assets and liabilities consisted of the following at December 31, 2018 and 2017 (amounts in thousands):     

	2018			2017
Acquired below-market ground leases	$	396,916		$	396,916
Less: accumulated amortization	(36,518		)	(28,687		)
Acquired below-market ground leases, net	$	360,398		$	368,229

	2018			2017
Acquired below-market leases	$	(118,462	)	$	(132,026	)
Less: accumulated amortization	66,012			65,979
Acquired below-market leases, net	$	(52,450	)	$	(66,047	)

Schedule of Future Amortization Expense and Rental Revenue from Acquired Intangible Assets

We expect to recognize amortization expense and rental revenue from the acquired intangible assets and liabilities as follows (amounts in thousands):

For the year ending:	Future Ground Rent Amortization		Future Amortization Expense		Future Rental Revenue
2019	$	7,831	$	15,829	$	6,875
2020	7,831		12,967		3,651
2021	7,831		11,250		2,868
2022	7,831		10,433		3,185
2023	7,831		9,756		3,181
Thereafter	321,243		31,690		9,532
	$	360,398	$	91,925	$	29,292

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Debt (Tables)

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Schedule of Debt

Debt consisted of the following as of December 31, 2018 and 2017 (amounts in thousands):

							As of December 31, 2018
	Principal Balance as of December 31, 2018			Principal Balance as of December 31, 2017			Stated Rate		Effective Rate(1)		Maturity Date(2)
Fixed rate mortgage debt
Metro Center	$	91,838		$	93,948		3.59	%	3.68	%	11/5/2024
10 Union Square	50,000			50,000			3.70	%	3.97	%	4/1/2026
1542 Third Avenue	30,000			30,000			4.29	%	4.53	%	5/1/2027
First Stamford Place(3)	180,000			180,000			4.28	%	4.45	%	7/1/2027
1010 Third Avenue and 77 West 55th Street	38,995			39,710			4.01	%	4.22	%	1/5/2028
10 Bank Street	33,779			34,602			4.23	%	4.35	%	6/1/2032
383 Main Avenue	30,000			30,000			4.44	%	4.55	%	6/30/2032
1333 Broadway	160,000			66,602			4.21	%	4.29	%	2/5/2033
1400 Broadway
(first lien mortgage loan)	—			66,632			—		—		—
(second lien mortgage loan)	—			9,172			—		—		—
111 West 33rd Street
(first lien mortgage loan)	—			74,045			—		—		—
(second lien mortgage loan)	—			9,369			—		—		—
1350 Broadway	—			37,144			—		—		—
Total mortgage debt	614,612			721,224
Senior unsecured notes - exchangeable	250,000			250,000			2.63	%	3.93	%	8/15/2019
Senior unsecured notes: (4)
Series A	100,000			100,000			3.93	%	3.96	%	3/27/2025
Series B	125,000			125,000			4.09	%	4.12	%	3/27/2027
Series C	125,000			125,000			4.18	%	4.21	%	3/27/2030
Series D	115,000			115,000			4.08	%	4.11	%	1/22/2028
Series E	160,000			—			4.26	%	4.27	%	3/22/2030
Series F	175,000			—			4.44	%	4.45	%	3/22/2033
Unsecured revolving credit facility (4)	—			—			(5)		(5)		8/29/2021
Unsecured term loan facility (4)	265,000			265,000			(6)		(6)		8/29/2022
Total principal	1,929,612			1,701,224
Unamortized (discount) premiums, net of unamortized premiums (discount)	(1,647		)	(3,370		)
Deferred financing costs, net	(9,032		)	(9,133		)
Total	$	1,918,933		$	1,688,721

______________

(1) The effective rate is the yield as of December 31, 2018, including the effects of debt issuance costs and the amortization of the fair value of debt adjustment.

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

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

(4) At December 31, 2018, we were in compliance with all debt covenants.

(5) At December 31, 2018, the unsecured revolving credit facility bears a floating rate at 30 day LIBOR plus 1.10%. The rate at December 31, 2018 was 3.60%.

(6) The unsecured term loan facility bears a floating rate at 30 day LIBOR plus 1.20%. Pursuant to an interest rate swap agreement, the LIBOR rate is fixed at 2.1485% through maturity. The rate at December 31, 2018 was 3.35%

Schedule of Maturities of Long-term Debt

Aggregate required principal payments at December 31, 2018 are as follows (amounts in thousands):

Year	Amortization		Maturities		Total
2019	$	3,790	$	250,000	$	253,790
2020	3,938		—		3,938
2021	4,090		—		4,090
2022	5,628		265,000		270,628
2023	7,876		—		7,876
Thereafter	33,868		1,355,422		1,389,290
Total principal maturities	$	59,190	$	1,870,422	$	1,929,612

Schedule of Deferred Costs, Net

Deferred costs, net, consisted of the following at December 31, 2018 and 2017 (amounts in thousands):

	2018			2017
Leasing costs	$	178,120		$	164,751
Acquired in-place lease value and deferred leasing costs	214,550			237,364
Acquired above-market leases	52,136			67,415
	444,806			469,530
Less: accumulated amortization	(209,839		)	(215,102		)
Total deferred costs, net, excluding net deferred financing costs	$	234,967		$	254,428

Deferred financing costs, net, consisted of the following at December 31, 2018 and 2017 (amounts in thousands):     

	2018			2017
Financing costs	$	25,315		$	24,446
Less: accumulated amortization	(10,027		)	(7,039		)
Total deferred financing costs, net	$	15,288		$	17,407

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Accounts Payable and Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2018

Payables and Accruals [Abstract]

Schedule of Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses consist of the following as of December 31, 2018 and 2017 (amounts in thousands):

	2018		2017
Accrued capital expenditures	$	85,242	$	71,769
Accounts payable and accrued expenses	34,585		32,509
Interest rate swap agreements liability	5,243		436
Accrued interest payable	4,990		5,687
Due to affiliated companies	616		448
Total accounts payable and accrued expenses	$	130,676	$	110,849

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Financial Instruments and Fair Values (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Summary of the 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 December 31, 2018 and 2017 (dollar amounts in thousands):     

								December 31, 2018					December 31, 2017
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	$	2,536	$	—		$	—	$	(436	)
Interest rate swap	125,000		3 Month LIBOR	2.9580	%	July 1, 2019	July 1, 2026	—		(2,623		)	—		—
Interest rate swap	125,000		3 Month LIBOR	2.9580	%	July 1, 2019	July 1, 2026	—		(2,620		)	—		—
								$	2,536	$	(5,243	)	$	—	$	(436	)

Summary 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 on accumulated other comprehensive income (loss) for the years ended December 31, 2018, 2017 and 2016 (amounts in thousands):    

Effects of Cash Flow Hedges	December 31, 2018			December 31, 2017			December 31, 2016
Amount of gain (loss) recognized in other comprehensive income (loss)	$	(2,721	)	$	(11,658	)	$	(3,054	)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense	(1,845		)	(1,142		)	—

The table below shows the effect of our derivative financial instruments designated as cash flow hedges on the consolidated statements of income for the years ended December 31, 2018, 2017 and 2016 (amounts in thousands):

Effects of Cash Flow Hedges	December 31, 2018			December 31, 2017			December 31, 2016
Total interest (expense) presented on the consolidated statements of income in which the effects of cash flow hedges are recorded	$	(79,623	)	$	(68,473	)	$	(70,595	)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense	(1,845		)	(1,142		)	—

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 December 31, 2018 and 2017 (amounts in thousands):

	December 31, 2018
	Carrying Value		Estimated Fair Value
			Total		Level 1		Level 2		Level 3
Interest rate swaps included in prepaid expenses and other assets	$	2,536	$	2,536	$	—	$	2,536	$	—
Interest rate swaps included in accounts payable and accrued expenses	5,243		5,243		—		5,243		—
Mortgage notes payable	608,567		597,424		—		—		597,424
Senior unsecured notes - Exchangeable	247,930		250,625		—		250,625		—
Senior unsecured notes - Series A, B, C, D, E and F	798,289		795,662		—		—		795,662
Unsecured term loan facility	264,147		265,000		—		—		265,000

	December 31, 2017
	Carrying Value		Estimated Fair Value
			Total		Level 1		Level 2		Level 3
Interest rate swaps included in prepaid expenses and other assets	$	—	$	—	$	—	$	—	$	—
Interest rate swaps included in accounts payable and accrued expenses	436		436		—		436		—
Mortgage notes payable	717,164		707,300		—		—		707,300
Senior unsecured notes - Exchangeable	244,739		275,723		—		275,723		—
Senior unsecured notes - Series A, B, C, D, E and F	463,156		460,352		—		—		460,352
Unsecured term loan facility	263,662		265,000		—		—		265,000

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Rental Income (Tables)

12 Months Ended

Dec. 31, 2018

Leases [Abstract]

Schedule of Future Minimum Payments Receivable for Operating Leases

As of December 31, 2018, we were entitled to the following future contractual minimum lease payments on non-cancellable operating leases to be received which expire on various dates through 2038 (amounts in thousands):

2019	$	485,441
2020	460,127
2021	423,365
2022	391,395
2023	362,738
Thereafter	1,536,461
	$	3,659,527

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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Lease Payments

Future minimum lease payments to be paid over the terms of the leases are as follows (amounts in thousands):

2019	$	1,518
2020	1,518
2021	1,518
2022	1,518
2023	1,518
Thereafter	68,298
Total	$	75,888

Summary of Percent of Total Rental Revenue

For the years ended December 31, 2018, 2017 and 2016, the six properties listed below accounted for the indicated percentage of total rental revenues. No other property accounted for more than 5.0% of total rental revenues.

	Year Ended December 31,
	2018		2017		2016
Empire State Building	31.9	%	32.0	%	32.6	%
One Grand Central Place	12.8	%	13.1	%	12.5	%
111 West 33rd Street	9.3	%	8.6	%	6.8	%
1400 Broadway	7.1	%	7.4	%	7.8	%
First Stamford Place	5.9	%	5.4	%	6.4	%
250 West 57th Street	5.2	%	5.2	%	5.3	%

Schedule of Contributions to Multiemployer Plans

Contributions we made to the multi-employer plans for the years ended December 31, 2018, 2017 and 2016 are included in the table below (amounts in thousands):

	For the Year Ended December 31,
Benefit Plan	2018		2017		2016
Pension Plans (pension and annuity)*	$	3,327	$	3,035	$	3,155
Health Plans**	9,373		8,551		8,280
Other***	814		856		542
Total plan contributions	$	13,514	$	12,442	$	11,977

* Pension plans include $1.0 million, $0.9 million and $0.8 million for the years ended 2018, 2017 and 2016, respectively, to multiemployer plans not discussed above.

** Health plans include $1.6 million, $1.6 million and $1.6 million for the years ended 2018, 2017 and 2016, respectively, to multiemployer plans not discussed above.

*** Other consists of union costs which were not itemized between pension and health plans. Other includes $0.2 million, $0.2 million and $0.2 million for the years ended 2018, 2017 and 2016, respectively, in connection with other multiemployer plans not discussed above.

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Capital (Tables)

12 Months Ended

Dec. 31, 2018

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

Dividends Declared

The following table summarizes the distributions paid on our operating partnership units for the years ended December 31, 2018, 2017 and 2016:

Record Date	Payment Date	Amount per Operating Partnership Unit
December 17, 2018	December 31, 2018	$0.105
September 14, 2018	September 28, 2018	$0.105
June 15, 2018	June 29, 2018	$0.105
March 15, 2018	March 30, 2018	$0.105
December 15, 2017	December 29, 2017	$0.105
September 15, 2017	September 29, 2017	$0.105
June 15, 2017	June 30, 2017	$0.105
March 15, 2017	March 31, 2017	$0.105
December 15, 2016	December 29, 2016	$0.105
September 19, 2016	September 30, 2016	$0.105
June 15, 2016	June 30, 2016	$0.105
March 16, 2016	March 31, 2016	$0.085

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 year ended December 31, 2018:

	ESRT Restricted Stock		LTIP Units		Weighted Average Grant Fair Value
Unvested balance at December 31, 2017	90,791		3,588,609		$	11.20
Vested	(30,693	)	(495,303	)	14.59
Granted	39,608		2,719,801		8.54
Forfeited or unearned	(8,548	)	(110,286	)	8.50
Unvested balance at December 31, 2018	91,158		5,702,821		$	9.68

Schedule of Earnings Per Unit, Basic and Diluted

Earnings per unit for the years ended December 31, 2018, 2017 and 2016 is computed as follows (amounts in thousands, except per share amounts):

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit)

TRS Holdings and Observatory TRS are taxable entities and their consolidated provision for income taxes consisted of the following for the years ended December 31, 2018, 2017 and 2016 (amounts in thousands):

	For the Year Ended December 31,
	2018			2017			2016
Current:
Federal	$	(2,389	)	$	(3,923	)	$	(3,632	)
State and local	(2,253		)	(2,304		)	(2,055		)
Total current	(4,642		)	(6,227		)	(5,687		)
Deferred:
Federal	—			(446		)	(291		)
State and local	—			—			(168		)
Total deferred	—			(446		)	(459		)
Income tax expense	$	(4,642	)	$	(6,673	)	$	(6,146	)

Schedule of Actual Tax Provision Differed From Federal Statutory Corporate Rate

The actual tax provision differed from that computed at the federal statutory corporate rate as follows (amounts in thousands):

	For the Year Ended December 31,
	2018			2017			2016
Federal tax expense at statutory rate	$	(2,844	)	$	(4,684	)	$	(4,629	)
State income taxes, net of federal benefit	(1,798		)	(1,543		)	(1,517		)
Corporate income tax rate adjustment	—			(446		)	—
Income tax expense	$	(4,642	)	$	(6,673	)	$	(6,146	)

Schedule of Deferred Tax Assets and Liabilities

The income tax effects of temporary differences that give rise to deferred tax assets are presented below as of December 31, 2018, 2017 and 2016 (amounts in thousands):

	2018		2017		2016
Deferred tax assets:
Deferred revenue on unredeemed observatory admission ticket sales	$	1,396	$	1,395	$	198

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Segment Reporting (Tables)

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

The following tables provide components of segment profit for each segment for the years ended December 31, 2018, 2017 and 2016, as reviewed by management (amounts in thousands):

	2018
	Real Estate			Observatory			Intersegment Elimination			Total
Revenues:
Rental revenue	$	493,231		$	—		$	—		$	493,231
Intercompany rental revenue	79,954			—			(79,954		)	—
Tenant expense reimbursement	72,372			—			—			72,372
Observatory revenue	—			131,227			—			131,227
Lease termination fees	20,847			—			—			20,847
Third-party management and other fees	1,440			—			—			1,440
Other revenue and fees	12,394			—			—			12,394
Total revenues	680,238			131,227			(79,954		)	731,511
Operating expenses:
Property operating expenses	167,379			—			—			167,379
Intercompany rent expense	—			79,954			(79,954		)	—
Ground rent expense	9,326			—			—			9,326
General and administrative expenses	52,674			—			—			52,674
Observatory expenses	—			32,767			—			32,767
Real estate taxes	110,000			—			—			110,000
Depreciation and amortization	168,430			78			—			168,508
Total operating expenses	507,809			112,799			(79,954		)	540,654
Total operating income	172,429			18,428			—			190,857
Other income (expense):
Interest income	10,661			—			—			10,661
Interest expense	(79,623		)	—			—			(79,623		)
Income before income taxes	103,467			18,428			—			121,895
Income tax expense	(1,114		)	(3,528		)	—			(4,642		)
Net income	$	102,353		$	14,900		$	—		$	117,253
Segment assets	$	3,930,330		$	265,450		$	—		$	4,195,780
Expenditures for segment assets	$	201,685		$	54,811		$	—		$	256,496

	2017
	Real Estate			Observatory			Intersegment Elimination			Total
Revenues:
Rental revenue	$	483,944		$	—		$	—		$	483,944
Intercompany rental revenue	77,646			—			(77,646		)	—
Tenant expense reimbursement	73,679			—			—			73,679
Observatory revenue	—			127,118			—			127,118
Lease termination fees	13,551			—			—			13,551
Third-party management and other fees	1,400			—			—			1,400
Other revenue and fees	9,834			—			—			9,834
Total revenues	660,054			127,118			(77,646		)	709,526
Operating expenses:
Property operating expenses	163,531			—			—			163,531
Intercompany rent expense	—			77,646			(77,646		)	—
Ground rent expense	9,326			—			—			9,326
General and administrative expenses	50,315			—			—			50,315
Observatory expenses	—			30,275			—			30,275
Real estate taxes	102,466			—			—			102,466
Depreciation and amortization	160,630			80			—			160,710
Total operating expenses	486,268			108,001			(77,646		)	516,623
Total operating income (loss)	173,786			19,117			—			192,903
Other income (expense):
Interest income	2,942			—			—			2,942
Interest expense	(68,473		)	—			—			(68,473		)
Loss on early extinguishment of debt	(2,157		)	—			—			(2,157		)
Loss from derivative financial instrument	(289		)	—			—			(289		)
Income before income taxes	105,809			19,117			—			124,926
Income tax expense	(1,306		)	(5,367		)	—			(6,673		)
Net income	$	104,503		$	13,750		$	—		$	118,253
Segment assets	$	3,670,907		$	260,440		$	—		$	3,931,347
Expenditures for segment assets	$	191,541		$	36,621		$	—		$	228,162

	2016
	Real Estate			Observatory			Intersegment Elimination			Total
Revenues:
Rental revenue	$	460,653		$	—		$	—		$	460,653
Intercompany rental revenue	75,658			—			(75,658		)	—
Tenant expense reimbursement	73,459			—			—			73,459
Observatory revenue	—			124,814			—			124,814
Lease termination fees	7,676			—			—			7,676
Third-party management and other fees	1,766			—			—			1,766
Other revenue and fees	8,970			15			—			8,985
Total revenues	628,182			124,829			(75,658		)	677,353
Operating expenses:
Property operating expenses	153,850			—			—			153,850
Intercompany rent expense	—			75,658			(75,658		)	—
Ground rent expense	9,326			—			—			9,326
General and administrative expenses	49,078			—			—			49,078
Observatory expenses	—			29,833			—			29,833
Real estate taxes	96,061			—			—			96,061
Acquisition expenses	98			—			—			98
Depreciation and amortization	154,817			394			—			155,211
Total operating expenses	463,230			105,885			(75,658		)	493,457
Total operating income (loss)	164,952			18,944			—			183,896
Other income (expense):
Interest income	647			—			—			647
Interest expense	(70,595		)	—			—			(70,595		)
Loss on early extinguishment of debt	(552		)	—			—			(552		)
Income (loss) before income taxes	94,452			18,944			—			113,396
Income tax expense	(1,361		)	(4,785		)	—			(6,146		)
Net income	$	93,091		$	14,159		$	—		$	107,250
Segment assets	$	3,641,844		$	249,109		$	—		$	3,890,953
Expenditures for segment assets	$	197,680		$	—		$	—		$	197,680

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Summary of Quarterly Financial Information (unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

The quarterly results of operations of our company for the years ended December 31, 2018, 2017 and 2016 are as follows (amounts in thousands):

	March 31, 2018		June 30, 2018		September 30, 2018		December 31, 2018
Revenues	$	167,271	$	178,529	$	186,402	$	199,309
Operating income	$	34,164	$	49,665	$	48,538	$	58,490
Net income	$	18,058	$	30,184	$	29,230	$	39,781
Net income attributable to common unitholders	$	17,824	$	29,950	$	28,996	$	39,547
Net income per share attributable to common unitholders:
Basic and diluted	$	0.06	$	0.10	$	0.10	$	0.13
	March 31, 2017		June 30, 2017		September 30, 2017		December 31, 2017
Revenues	$	164,333	$	176,349	$	186,547	$	182,297
Operating income	$	36,045	$	50,659	$	56,008	$	50,191
Net income	$	19,145	$	31,359	$	35,489	$	32,260
Net income attributable to common unitholders	$	18,911	$	31,125	$	35,255	$	32,026
Net income per share attributable to common unitholders:
Basic and diluted	$	0.06	$	0.10	$	0.12	$	0.11
	March 31, 2016		June 30, 2016		September 30, 2016		December 31, 2016
Revenues	$	157,057	$	165,785	$	175,704	$	178,807
Operating income	$	34,097	$	44,162	$	53,442	$	52,195
Net income	$	16,705	$	24,640	$	32,897	$	33,008
Net income attributable to common unitholders	$	16,471	$	24,406	$	32,663	$	32,774
Net income per share attributable to common unitholders:
Basic and diluted	$	0.06	$	0.09	$	0.12	$	0.11

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Description of Business and Organization - Narrative (Details)	12 Months Ended
	Dec. 31, 2018 ft² entity parcel office_and_property $ / shares
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
OP units owned by the Company, percent	57.70%
Area of real estate property (in sqft)	10,100,000
Number of entities to be treated as taxable REIT subsidiary of ESRT | entity	2
ESRT
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
OP units owned by the Company, percent	57.70%
Common Class A | ESRT
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Par value (in dollars per share) | $ / shares	$ 0.01
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)	1,800,000
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 | Manhattan and Westport, Connecticut
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property (in sqft)	205,748
Retail | Manhattan
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property (in sqft)	513,606
Number of properties (in properties) | office_and_property	4
Retail | 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

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Summary of Significant Accounting Policies Narrative (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jan. 01, 2019 USD ($)
Accounting Policies [Line Items]
Deferred revenue	$ 4,100,000	$ 4,100,000
Advertising and marketing expense	8,900,000	7,600,000	$ 9,400,000
Capitalized interest	$ 1,600,000	$ 500,000	$ 0
Number of reportable segments (segment) | segment	2
Remaining contractual payments under ground lease agreements	$ 75,888,000
Capitalized internal leasing costs	$ 4,600,000
Building and Building Improvements
Accounting Policies [Line Items]
Useful life (in years)	39 years
Corporate Equipment | Minimum
Accounting Policies [Line Items]
Useful life (in years)	3 years
Corporate Equipment | Maximum
Accounting Policies [Line Items]
Useful life (in years)	7 years
Subsequent event | ASU 2016-02
Accounting Policies [Line Items]
Operating lease, right-of-use assets				$ 30,000,000
Operating lease, liabilities				$ 30,000,000

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Deferred Costs, Acquired Lease Intangibles and Goodwill - Schedule of Deferred Costs, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred Costs [Line Items]
Leasing costs	$ 178,120	$ 164,751
Total deferred costs, gross	444,806	469,530
Less: accumulated amortization	(209,839)	(215,102)
Total deferred costs, net, excluding net deferred financing costs	234,967	254,428
Acquired in-place lease value and deferred leasing costs
Deferred Costs [Line Items]
Acquired intangible assets, gross	214,550	237,364
Acquired above-market leases
Deferred Costs [Line Items]
Acquired intangible assets, gross	$ 52,136	$ 67,415

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Deferred Costs, Acquired Lease Intangibles and Goodwill - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2013
Deferred Costs [Line Items]
Amortization of deferred leasing and acquired deferred leasing costs	$ 26,300	$ 24,100	$ 24,200
Amortization of acquired above and below-market leases, net	6,120	5,721	8,795
Goodwill	491,479	491,479
Empire State Building observatory operations
Deferred Costs [Line Items]
Goodwill				$ 227,500
Empire State Building
Deferred Costs [Line Items]
Goodwill				250,800
501 Seventh Avenue
Deferred Costs [Line Items]
Goodwill				$ 13,200
Lease agreements
Deferred Costs [Line Items]
Amortization expense related to acquired lease intangibles	$ 12,100	17,100	$ 24,600
Ground lease
Deferred Costs [Line Items]
Weighted-average amortization period (in years)	24 years 6 months
In-place leases and deferred leasing costs
Deferred Costs [Line Items]
Weighted-average amortization period (in years)	4 years 6 months
Above-market leases
Deferred Costs [Line Items]
Weighted-average amortization period (in years)	3 years 9 months
Below-market Lease
Deferred Costs [Line Items]
Weighted-average amortization period (in years)	4 years
Revolving Credit Facility | Unsecured revolving credit facility
Deferred Costs [Line Items]
Net deferred financing costs	$ 6,300	$ 8,300

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Deferred Costs, Acquired Lease Intangibles and Goodwill - Acquired Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Acquired below-market ground leases	$ 396,916	$ 396,916
Less: accumulated amortization	(36,518)	(28,687)
Acquired below-market ground leases, net	360,398	368,229
Acquired below-market leases	(118,462)	(132,026)
Less: accumulated amortization	66,012	65,979
Acquired below-market leases, net	$ (52,450)	$ (66,047)

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Deferred Costs, Acquired Lease Intangibles and Goodwill - Future Amortization Expense and Rental Revenue (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Future Rental Revenue [Abstract]
2019	$ 6,875
2020	3,651
2021	2,868
2022	3,185
2023	3,181
Thereafter	9,532
Future Rental Revenue	29,292
Ground lease
Future Amortization Expense [Abstract]
2019	7,831
2020	7,831
2021	7,831
2022	7,831
2023	7,831
Thereafter	321,243
Future Amortization Expense	360,398
Lease agreements
Future Amortization Expense [Abstract]
2019	15,829
2020	12,967
2021	11,250
2022	10,433
2023	9,756
Thereafter	31,690
Future Amortization Expense	$ 91,925

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Debt - Schedule of Long term Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Jan. 31, 2018	Dec. 31, 2017	Aug. 31, 2017	Aug. 31, 2014
Debt Instrument [Line Items]
Unsecured facility	$ 0		$ 0
Deferred financing costs, net	(15,288,000)		(17,407,000)
Total	608,567,000		717,164,000
Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate debt	614,612,000		721,224,000
Total principal	1,929,612,000		1,701,224,000
Unamortized (discount) premiums, net of unamortized premiums (discount)	(1,647,000)		(3,370,000)
Deferred financing costs, net	(9,032,000)		(9,133,000)
Total	1,918,933,000		1,688,721,000
Fixed rate mortgage debt | Metro Center
Debt Instrument [Line Items]
Fixed rate debt	$ 91,838,000		93,948,000
Stated Rate	3.59%
Effective rate	3.68%
Fixed rate mortgage debt | 10 Union Square
Debt Instrument [Line Items]
Fixed rate debt	$ 50,000,000		50,000,000
Stated Rate	3.70%
Effective rate	3.97%
Fixed rate mortgage debt | 1542 Third Avenue
Debt Instrument [Line Items]
Fixed rate debt	$ 30,000,000		30,000,000
Stated Rate	4.29%
Effective rate	4.53%
Fixed rate mortgage debt | First Stamford Place
Debt Instrument [Line Items]
Fixed rate debt	$ 180,000,000		180,000,000
Stated Rate	4.28%
Effective rate	4.45%
Fixed rate mortgage debt | First Stamford Place - First Lien
Debt Instrument [Line Items]
Stated Rate	4.09%
Face amount	$ 164,000,000
Fixed rate mortgage debt | First Stamford Place - Second Lien
Debt Instrument [Line Items]
Stated Rate	6.25%
Face amount	$ 16,000,000
Fixed rate mortgage debt | 1010 Third Avenue and 77 West 55th Street
Debt Instrument [Line Items]
Fixed rate debt	$ 38,995,000		39,710,000
Stated Rate	4.01%
Effective rate	4.22%
Fixed rate mortgage debt | 10 Bank Street
Debt Instrument [Line Items]
Fixed rate debt	$ 33,779,000		34,602,000
Stated Rate	4.23%
Effective rate	4.35%
Fixed rate mortgage debt | 383 Main Avenue
Debt Instrument [Line Items]
Fixed rate debt	$ 30,000,000		30,000,000
Stated Rate	4.44%
Effective rate	4.55%
Fixed rate mortgage debt | 1333 Broadway
Debt Instrument [Line Items]
Fixed rate debt	$ 160,000,000		66,602,000
Stated Rate	4.21%
Effective rate	4.29%
Face amount		$ 160,000,000.0
Fixed rate mortgage debt | 1400 Broadway - First Lien
Debt Instrument [Line Items]
Fixed rate debt	$ 0		66,632,000
Stated Rate	0.00%
Effective rate	0.00%
Fixed rate mortgage debt | 1400 Broadway - Second Lien
Debt Instrument [Line Items]
Fixed rate debt	$ 0		9,172,000
Stated Rate	0.00%
Effective rate	0.00%
Fixed rate mortgage debt | (first lien mortgage loan)
Debt Instrument [Line Items]
Fixed rate debt	$ 0		74,045,000
Stated Rate	0.00%
Effective rate	0.00%
Fixed rate mortgage debt | (second lien mortgage loan)
Debt Instrument [Line Items]
Fixed rate debt	$ 0		9,369,000
Stated Rate	0.00%
Effective rate	0.00%
Fixed rate mortgage debt | 1350 Broadway
Debt Instrument [Line Items]
Fixed rate debt	$ 0		37,144,000
Stated Rate	0.00%
Effective rate	0.00%
Convertible Debt | Senior unsecured notes - exchangeable
Debt Instrument [Line Items]
Fixed rate debt	$ 250,000,000		250,000,000
Stated Rate	2.625%				2.625%
Effective rate	3.93%				3.80%
Face amount					$ 250,000,000
Senior Notes | Series A Senior Notes due 2025
Debt Instrument [Line Items]
Total	$ 100,000,000		100,000,000
Stated Rate	3.93%
Effective rate	3.96%
Senior Notes | Series B Senior Notes due 2027
Debt Instrument [Line Items]
Total	$ 125,000,000		125,000,000
Stated Rate	4.09%
Effective rate	4.12%
Senior Notes | Series C Senior Notes due 2030
Debt Instrument [Line Items]
Total	$ 125,000,000		125,000,000
Stated Rate	4.18%
Effective rate	4.21%
Senior Notes | Series D Senior Notes due 2028
Debt Instrument [Line Items]
Total	$ 115,000,000		$ 115,000,000
Stated Rate	4.08%		4.08%
Effective rate	4.11%
Face amount			$ 115,000,000.0
Senior Notes | Series E Senior Notes due 2030
Debt Instrument [Line Items]
Total	$ 160,000,000		$ 0
Stated Rate	4.26%		4.26%
Effective rate	4.27%
Face amount			$ 160,000,000.0
Senior Notes | Series F Senior Notes due 2033
Debt Instrument [Line Items]
Total	$ 175,000,000		$ 0
Stated Rate	4.44%		4.44%
Effective rate	4.45%
Face amount			$ 175,000,000.0
Revolving Credit Facility | Unsecured revolving credit facility
Debt Instrument [Line Items]
Unsecured facility	$ 0		0
Effective rate	3.60%
Revolving Credit Facility | Unsecured revolving credit facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.10%
Revolving Credit Facility | Unsecured Term Loan Facility
Debt Instrument [Line Items]
Unsecured facility	$ 265,000,000		$ 265,000,000	$ 265,000,000
Effective rate	2.1485%
Pay rate	3.35%
Revolving Credit Facility | Unsecured Term Loan Facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.20%

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Debt - Mortgage Debt (Details) - USD ($)	1 Months Ended	12 Months Ended
	Jan. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Repayment of mortgage notes payable		$ 266,613,000	$ 346,615,000	$ 32,305,000
Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate debt		614,612,000	721,224,000
Fixed rate mortgage debt | 1333 Broadway
Debt Instrument [Line Items]
Fixed rate debt		$ 160,000,000	$ 66,602,000
Face amount	$ 160,000,000.0
Fixed rate mortgage debt | 1400 Broadway
Debt Instrument [Line Items]
Repayment of mortgage notes payable	$ 75,800,000

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Debt - Schedule of Maturities of Long-term Debt (Details) - Fixed rate mortgage debt - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
2019 amortization	$ 3,790
2020 amortization	3,938
2021 amortization	4,090
2022 amortization	5,628
2023 amortization	7,876
Thereafter	33,868
Total amortization	59,190
2019 maturities	250,000
2020 maturities	0
2021 maturities	0
2022 maturities	265,000
2023 maturities	0
Thereafter	1,355,422
Total maturities	1,870,422
2019	253,790
2020	3,938
2021	4,090
2022	270,628
2023	7,876
Thereafter	1,389,290
Total	$ 1,929,612	$ 1,701,224

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Debt - Schedule of Deferred Financing Costs, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Financing costs	$ 25,315	$ 24,446
Less: accumulated amortization	(10,027)	(7,039)
Total deferred financing costs, net	15,288	17,407
Amortization expense related to deferred financing costs	4,100	4,700	$ 5,000
Revolving Credit Facility | Unsecured revolving credit facility
Debt Instrument [Line Items]
Net deferred financing costs	$ 6,300	$ 8,300

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Debt - Unsecured Revolving Credit and Term Loan Facility (Details)	1 Months Ended	12 Months Ended
	Aug. 31, 2017 USD ($) option	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Line of Credit Facility [Line Items]
Loss on early extinguishment of debt		$ 0	$ 2,157,000	$ 552,000
Unsecured facility		0	0
Unsecured revolving credit facility | Revolving Credit Facility
Line of Credit Facility [Line Items]
Loss on early extinguishment of debt			2,200,000
Current borrowing capacity	$ 1,100,000,000.0
Unsecured facility		0	0
Option to extend maturity, number | option	2
Extension period	6 months
Maximum leverage ratio	60.00%
Maximum consolidated secured indebtedness to asset value	40.00%
Minimum tangible net worth	$ 1,200,000,000.0
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%
Unsecured Revolving Credit Facility And Term Loan | Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 1,365,000,000.000
Unsecured revolving credit facility higher borrowing capacity option	1,750,000,000.00
Term Loan | Revolving Credit Facility
Line of Credit Facility [Line Items]
Current borrowing capacity	265,000,000
Unsecured facility	$ 265,000,000	$ 265,000,000	$ 265,000,000
Minimum | Unsecured revolving credit facility | Revolving Credit Facility
Line of Credit Facility [Line Items]
Extension fee percent of outstanding commitments under revolving credit facility	0.0625%
Maximum | Unsecured revolving credit facility | Revolving Credit Facility
Line of Credit Facility [Line Items]
Extension fee percent of outstanding commitments under revolving credit facility	0.075%

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Debt - Senior Unsecured Notes Exchangeable (Details)	1 Months Ended	12 Months Ended
	Aug. 31, 2014 USD ($) d $ / shares	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Senior unsecured notes, net		$ 1,046,219,000	$ 707,895,000
Interest expense		79,623,000	68,473,000	$ 70,595,000
Amortization of deferred financing costs		$ 4,100,000	4,700,000	5,000,000
Convertible Debt | Senior unsecured notes - exchangeable
Debt Instrument [Line Items]
Face amount	$ 250,000,000
Stated interest rate	2.625%	2.625%
Conversion price (USD per share) | $ / shares	$ 19.45	$ 19.23
Debt, conversion ratio	0.0514059	0.0520116
Percentage of principal amount redeemed	100.00%
Effective interest rate	3.80%	3.93%
Senior unsecured notes, net	$ 236,600,000
Embedded conversion option		$ 13,400,000	13,400,000
Remaining discount amortization period	5 years
Unamortized discount		1,600,000	4,300,000
Underwriting expense	$ 3,100,000
Deferred finance costs	$ 2,900,000
Embedded conversion feature, embedded		200,000	200,000
Interest expense on note		9,900,000	9,900,000	9,900,000
Interest expense		6,600,000	6,600,000	6,600,000
Accretion of debt discount		2,700,000	2,700,000	2,700,000
Amortization of deferred financing costs		$ 600,000	$ 600,000	$ 600,000
Covenant scenario one | Convertible Debt | Senior unsecured notes - exchangeable
Debt Instrument [Line Items]
Threshold percentage of stock price trigger	130.00%
Threshold trading days | d	20
Threshold consecutive trading days | d	30
Covenant scenario two | Convertible Debt | Senior unsecured notes - exchangeable
Debt Instrument [Line Items]
Threshold percentage of stock price trigger	98.00%
Threshold consecutive business days	5 days

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Debt - Senior Unsecured Notes (Details) - Senior Notes - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Series D, Series E, and Series F Senior Unsecured Notes [Member]
Line of Credit Facility [Line Items]
Face amount		$ 450,000,000.0
Series D Senior Notes due 2028
Line of Credit Facility [Line Items]
Face amount		$ 115,000,000.0
Stated interest rate	4.08%	4.08%
Series E Senior Notes due 2030
Line of Credit Facility [Line Items]
Face amount		$ 160,000,000.0
Stated interest rate	4.26%	4.26%
Series F Senior Notes due 2033
Line of Credit Facility [Line Items]
Face amount		$ 175,000,000.0
Stated interest rate	4.44%	4.44%

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Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Accrued capital expenditures	$ 85,242	$ 71,769
Accounts payable and accrued expenses	34,585	32,509
Interest rate swap agreements liability	5,243	436
Accrued interest payable	4,990	5,687
Due to affiliated companies	616	448
Total accounts payable and accrued expenses	$ 130,676	$ 110,849

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Financial Instruments and Fair Values - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Interest rate swap agreements liability	$ 5,243	$ 436
Unrealized loss on valuation of interest rate swap agreements			$ 3,054
Loss from derivative financial instruments	0	289	0
Interest rate swaps
Derivative [Line Items]
Interest rate swap agreements liability	5,300
Designated as Hedging Instrument | Cash Flow Hedging
Derivative [Line Items]
Unrealized loss on valuation of interest rate swap agreements	900	10,500
Loss expected to be reclassified within twelve months	900
Loss from derivative financial instruments		300
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swaps
Derivative [Line Items]
Notional amount	515,000	265,000
Unrealized loss on valuation of interest rate swap agreements			$ 3,054
Prepaid expenses and other assets | Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swaps
Derivative [Line Items]
Interest rate swap agreements asset	2,500
Accounts payable and accrued expenses | Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swaps
Derivative [Line Items]
Interest rate swap agreements liability	$ 5,200	$ 400

XML

Financial Instruments and Fair Values - Terms of Agreements and Fair Value (Details) - Cash Flow Hedging - Designated as Hedging Instrument - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Asset	$ 2,536,000	$ 0
Liability	(5,243,000)	(436,000)
LIBOR | Interest Rate Swap, One Month LIBOR, 2.1485%
Derivatives, Fair Value [Line Items]
Notional Amount	$ 265,000,000
Pay Rate	2.1485%
Asset	$ 2,536,000	0
Liability	0	(436,000)
LIBOR | Interest Rate Swap, Three Month LIBOR, 2.9580%, Swap Number One
Derivatives, Fair Value [Line Items]
Notional Amount	$ 125,000,000
Pay Rate	2.958%
Asset	$ 0	0
Liability	(2,623,000)	0
LIBOR | Interest Rate Swap, Three Month LIBOR, 2.9580%, Swap Number Two
Derivatives, Fair Value [Line Items]
Notional Amount	$ 125,000,000
Pay Rate	2.958%
Asset	$ 0	0
Liability	$ (2,620,000)	$ 0

XML

Financial Instruments and Fair Values - Gain and Loss of Cash Flow Hedges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in other comprehensive income (loss)	$ (2,721)	$ (11,658)
Amount of gain (loss) recognized in other comprehensive income (loss)			$ (3,054)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense	(1,845)	(1,142)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense			0
Interest expense	(79,623)	(68,473)	(70,595)
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in other comprehensive income (loss)	(2,721)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense	(1,845)
Designated as Hedging Instrument | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in other comprehensive income (loss)	(900)	(10,500)
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in other comprehensive income (loss)		(11,658)
Amount of gain (loss) recognized in other comprehensive income (loss)			(3,054)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense		(1,142)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense			0
Accumulated other comprehensive income (loss) | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense	$ (1,845)	$ (1,142)	$ 0

XML

Financial Instruments and Fair Values - Schedule of the aggregate carrying value of debt and estimates of fair value (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in accounts payable and accrued expenses	$ 5,243	$ 436
Fixed rate mortgage debt | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	608,567	717,164
Fixed rate mortgage debt | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	597,424	707,300
Fixed rate mortgage debt | Level 1 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Fixed rate mortgage debt | Level 2 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Fixed rate mortgage debt | Estimated Fair Value | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	597,424	707,300
Senior unsecured notes - Series A, B, C, D, E and F | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	798,289	463,156
Senior unsecured notes - Series A, B, C, D, E and F | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	795,662	460,352
Senior unsecured notes - Series A, B, C, D, E and F | Level 1 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Senior unsecured notes - Series A, B, C, D, E and F | Level 2 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Senior unsecured notes - Series A, B, C, D, E and F | Estimated Fair Value | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	795,662	460,352
Senior unsecured notes - Exchangeable | Senior unsecured notes - Exchangeable | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	247,930	244,739
Senior unsecured notes - Exchangeable | Senior unsecured notes - Exchangeable | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	250,625	275,723
Senior unsecured notes - Exchangeable | Senior unsecured notes - Exchangeable | Level 1 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Senior unsecured notes - Exchangeable | Senior unsecured notes - Exchangeable | Level 2 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	250,625	275,723
Senior unsecured notes - Exchangeable | Senior unsecured notes - Exchangeable | Estimated Fair Value | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Revolving Credit Facility | Term Loan | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	264,147	263,662
Revolving Credit Facility | Term Loan | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	265,000	265,000
Revolving Credit Facility | Term Loan | Level 1 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Revolving Credit Facility | Term Loan | Level 2 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Revolving Credit Facility | Term Loan | Estimated Fair Value | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	265,000	265,000
Interest rate swaps
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in accounts payable and accrued expenses	5,300
Interest rate swaps | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in prepaid expenses and other assets	2,536	0
Interest rate swaps included in accounts payable and accrued expenses	5,243	436
Interest rate swaps | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in prepaid expenses and other assets	2,536	0
Interest rate swaps included in accounts payable and accrued expenses	5,243	436
Interest rate swaps | Level 1 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in prepaid expenses and other assets	0	0
Interest rate swaps included in accounts payable and accrued expenses	0	0
Interest rate swaps | Level 2 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in prepaid expenses and other assets	2,536	0
Interest rate swaps included in accounts payable and accrued expenses	5,243	436
Interest rate swaps | Estimated Fair Value | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in prepaid expenses and other assets	0	0
Interest rate swaps included in accounts payable and accrued expenses	$ 0	$ 0

XML

Rental Income - Schedule of Future Minimum Payments Receivable for Operating Leases (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Operating Leases, Future Minimum Payments Receivable [Abstract]
2019	$ 485,441
2020	460,127
2021	423,365
2022	391,395
2023	362,738
Thereafter	1,536,461
Total Future Minimum Payments Receivable for Operating Leases	$ 3,659,527

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Commitments and Contingencies - Litigation (Details)	1 Months Ended
	Oct. 31, 2014 participant
Predecessor | New York State Supreme Court, New York County
Loss Contingencies [Line Items]
Number of plaintiffs opting out of settlement (participant)	12

XML

Commitments and Contingencies - Ground Lease Commitments (Details) $ in Thousands	Dec. 31, 2018 USD ($) property
Commitments and Contingencies Disclosure [Abstract]
Number of properties subject to ground leases (property) | property	3
2019	$ 1,518
2020	1,518
2021	1,518
2022	1,518
2023	1,518
Thereafter	68,298
Total	$ 75,888

XML

Commitments and Contingencies - Unfunded Capital Expenditures (Details) $ in Millions	Dec. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Unfunded capital expenditures	$ 88.4

XML

Commitments and Contingencies - Major Customers and Other Concentrations (Details) - Customer concentration risk - Rental revenue	12 Months Ended
	Dec. 31, 2018 office_and_property tenant	Dec. 31, 2017 office_and_property tenant	Dec. 31, 2016 office_and_property tenant
Concentration Risk [Line Items]
Number of tenants | tenant	5	5	5
Number of properties (in properties) | office_and_property	6	6	6
Empire State Building
Concentration Risk [Line Items]
Concentration risk percentage	31.90%	32.00%	32.60%
One Grand Central Place
Concentration Risk [Line Items]
Concentration risk percentage	12.80%	13.10%	12.50%
111 West 33rd Street
Concentration Risk [Line Items]
Concentration risk percentage	9.30%	8.60%	6.80%
1400 Broadway
Concentration Risk [Line Items]
Concentration risk percentage	7.10%	7.40%	7.80%
First Stamford Place
Concentration Risk [Line Items]
Concentration risk percentage	5.90%	5.40%	6.40%
250 West 57th Street
Concentration Risk [Line Items]
Concentration risk percentage	5.20%	5.20%	5.30%
Customer 1
Concentration Risk [Line Items]
Concentration risk percentage	6.00%	6.30%	6.40%
Customer 2
Concentration Risk [Line Items]
Concentration risk percentage	3.10%	3.20%	3.30%
Customer 3
Concentration Risk [Line Items]
Concentration risk percentage	2.90%	2.90%	2.90%
Customer 4
Concentration Risk [Line Items]
Concentration risk percentage	2.00%	2.10%	2.30%
Customer 5
Concentration Risk [Line Items]
Concentration risk percentage	2.00%	2.00%	2.00%

XML

Commitments and Contingencies - Multiemployer Pension and Defined Contribution Plans Narrative (Details) - Building Service 32BJ - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Pension Plans
Multiemployer Plans [Line Items]
Plan contributions	$ 272.3	$ 257.8	$ 249.5
Health Plans
Multiemployer Plans [Line Items]
Plan contributions	$ 1,400.0	$ 1,300.0	$ 1,200.0

XML

Commitments and Contingencies - Schedule of Contributions made to Multiemployer Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Multiemployer Plans [Line Items]
Contributions	$ 13,514	$ 12,442	$ 11,977
Pension Plans
Multiemployer Plans [Line Items]
Contributions	3,327	3,035	3,155
Pension Plans | Multiemployer Plan, Individually Insignificant Multiemployer Plans [Member]
Multiemployer Plans [Line Items]
Contributions	1,000	900	800
Health Plans
Multiemployer Plans [Line Items]
Contributions	9,373	8,551	8,280
Health Plans | Multiemployer Plan, Individually Insignificant Multiemployer Plans [Member]
Multiemployer Plans [Line Items]
Contributions	1,600	1,600	1,600
Other
Multiemployer Plans [Line Items]
Contributions	814	856	542
Other | Multiemployer Plan, Individually Insignificant Multiemployer Plans [Member]
Multiemployer Plans [Line Items]
Contributions	$ 200	$ 200	$ 200

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Capital (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	12 Months Ended
	Aug. 23, 2016	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Partners' Capital [Line Items]
Gross proceeds from sale of shares	$ 621,800	$ 4,700	$ 4,749	$ 0	$ 611,206
Shares and Units [Abstract]
OP units outstanding (shares)			303,300,000
OP units owned by the Company (shares)			174,900,000
OP units owned by the Company, percent			57.70%
OP units not owned by the Company (shares)			128,400,000
OP units not owned by the Company, percent			42.30%
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%
Private perpetual preferred units, liquidation preference per share (in dollars per share)			$ 16.62	$ 16.62
Series PR Common Units
Shares and Units [Abstract]
OP units not owned by the Company (shares)			86,202,638	91,759,741
Private Perpetual Preferred Units
Shares and Units [Abstract]
Private perpetual preferred units (shares)			1,560,360
Private perpetual preferred units, liquidation preference per share (in dollars per share)			$ 16.62
Dividend declared (in dollars per share)			$ 0.60
Common shares | Common Class A
Partners' Capital [Line Items]
Issuance of common shares (in shares)		284,015			29,610,854
Common shares issued (USD per share)	$ 21.00	$ 16.72
General Partner | Series PR Common Units
Partners' Capital [Line Items]
Issuance of common shares (in shares)	29,610,854		284,000		29,611,000
Q REIT Holding LLC
Partners' Capital [Line Items]
Interest held by subsidiary of QIA	9.90%	9.90%

XML

Capital - Distributions (Details) - USD ($) $ / shares in Units, $ in Millions													12 Months Ended
	Dec. 31, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 29, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 29, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stockholders' Equity Note Disclosure, Disclosure of Compensation Related Costs, Share-based Payments and Earnings Per Share [Abstract]
Dividends declared and paid on operating partnership units (in dollars per share)	$ 0.105	$ 0.105	$ 0.105	$ 0.105	$ 0.105	$ 0.105	$ 0.105	$ 0.105	$ 0.105	$ 0.105	$ 0.105	$ 0.085
Distributions paid to OP unit holders													$ 126.5	$ 127.0	$ 115.0

XML

Capital - Incentive and Share-based Compensation (Details) $ / shares in Units, $ in Millions	1 Months Ended					12 Months Ended
	May 31, 2018 USD ($) shares	Mar. 31, 2018 USD ($) vesting_installment shares	Feb. 28, 2018 USD ($) vesting_installment shares	May 31, 2017 USD ($) shares	Mar. 31, 2017 USD ($) vesting_installment shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares	Dec. 31, 2016 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility rate look-back period (in years)						6 years
Weighted-average per unit or share fair value (in dollars per share) | $ / shares						$ 8.54
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 Do Not Meet Age and Service Requirements for Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Noncash share-based compensation expense recognized | $						$ 17.0	$ 13.1	$ 9.0
Unrecognized compensation expense | $						$ 27.4
Unrecognized compensation expense, period for recognition (in years)						2 years 2 months
Awards that Meet Age and Service Requirements for Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Noncash share-based compensation expense recognized | $						$ 1.8	1.0	0.7
Unrecognized compensation expense | $						$ 1.0
Unrecognized compensation expense, period for recognition (in years)						1 year 13 months 12 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 | $						$ 23.6	$ 19.4
Weighted-average per unit or share fair value (in dollars per share) | $ / shares							$ 13.77
Risk free interest rate						2.50%
Expected volatility rate						20.00%
Fair value vested in period | $						$ 7.7	$ 7.6	5.1
Long-Term Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)						2,719,801
Time Based Long-Tern Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)					47,993
Fair value of share-based awards granted in period | $					$ 1.6
Time Based Long-Tern Incentive Plan Unit | 2013 Plan Units, Granted in March 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)		67,449
Fair value of share-based awards granted in period | $		$ 1.7
Award vesting period (in years)		4 years
Number of vesting installments (vesting installments) | vesting_installment		3
Performance Based Long-Term Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)					95,156
Fair value of share-based awards granted in period | $					$ 1.0
Performance Based Long-Term Incentive Plan Unit | 2013 Plan Units, Granted in March 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)		223,950
Fair value of share-based awards granted in period | $		$ 1.1
Award vesting period (in years)		3 years
Number of vesting installments (vesting installments) | vesting_installment		2
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)						39,608
Time Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)					34,407
Time Restricted Shares | 2013 Plan Units, Granted in March 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)		39,608
Long-Term Incentive Plan Unit and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period | $								$ 18.4
Weighted-average per unit or share fair value (in dollars per share) | $ / shares						$ 8.54		$ 9.60
Expected term						2 years 9 months 12 days	2 years 9 months 8 days
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected dividend rate						2.30%	2.05%	2.10%
Risk free interest rate							1.55%
Expected volatility rate							20.00%
Director | Time Based Long-Tern Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)	65,000
Fair value of share-based awards granted in period | $	$ 1.0
Award vesting period (in years)	3 years
Director | Time Based Long-Tern Incentive Plan Unit | 2013 Plan Units Granted In May 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)				50,408
Fair value of share-based awards granted in period | $				$ 1.0
Award vesting period (in years)				3 years
Executive Officer | Time Based Long-Tern Incentive Plan Unit | 2013 Plan Units, Granted in March 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)		386,876
Executive Officer | Time Based Long-Tern Incentive Plan Unit | 2013 Plan Units, Granted in February 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)			238,609
Fair value of share-based awards granted in period | $			$ 4.0
Award vesting period (in years)							3 years
Award vesting percentage of award face amount (in percentage)							125.00%
Executive Officer | Time Based Long-Tern Incentive Plan Unit | 2013 Plan Units, Granted in March 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)					313,275
Fair value of share-based awards granted in period | $					$ 6.1
Award vesting period (in years)					4 years
Number of vesting installments (vesting installments) | vesting_installment					3
Executive Officer | Time Based Long-Tern Incentive Plan Unit | Vest immediately
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)			25,158
Executive Officer | Time Based Long-Tern Incentive Plan Unit | Vest over three years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)			213,451
Award vesting period (in years)			3 years
Executive Officer | Time Based Long-Tern Incentive Plan Unit | Vest in two equal installments
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of vesting installments (vesting installments) | vesting_installment			2
Executive Officer | Performance Based Long-Term Incentive Plan Unit | 2013 Plan Units, Granted in March 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)		1,737,917
Executive Officer | Performance Based Long-Term Incentive Plan Unit | 2013 Plan Units, Granted in March 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)					865,742
Fair value of share-based awards granted in period | $					$ 9.6
Award vesting period (in years)					3 years
Number of vesting installments (vesting installments) | vesting_installment					2
2013 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under the plan (in shares)						12,200,000
Number of shares that remain available for future issuance (in shares)						4,300,000
Maximum | Long-Term Incentive Plan Unit and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free interest rate								0.84%
Minimum | Long-Term Incentive Plan Unit and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term								2 years 10 months
Expected volatility rate								24.00%

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Capital - Summary of ESRT restricted stock and LTIP unit activity (Details)	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Unvested balance, weighted average grant price, beginning balance (in dollars per share) | $ / shares	$ 11.20
Vested (in dollars per share) | $ / shares	14.59
Granted (in dollars per share) | $ / shares	8.54
Forfeited or unearned (in dollars per share) | $ / shares	8.50
Unvested balance, weighted average grant price, ending balance (in dollars per share) | $ / shares	$ 9.68
Restricted Stock
Restricted Stock and LTIP Unit Activity [Roll Forward]
Unvested balance, beginning balance (in shares)	90,791
Vested (in shares)	(30,693)
Granted (in shares)	39,608
Forfeited or unearned (in shares)	(8,548)
Unvested balance, ending balance (in shares)	91,158
Long-Term Incentive Plan Unit
Restricted Stock and LTIP Unit Activity [Roll Forward]
Unvested balance, beginning balance (in shares)	3,588,609
Vested (in shares)	(495,303)
Granted (in shares)	2,719,801
Forfeited or unearned (in shares)	(110,286)
Unvested balance, ending balance (in shares)	5,702,821

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Capital - Earnings Per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net income	$ 39,781	$ 29,230	$ 30,184	$ 18,058	$ 32,260	$ 35,489	$ 31,359	$ 19,145	$ 33,008	$ 32,897	$ 24,640	$ 16,705	$ 117,253	$ 118,253	$ 107,250
Private perpetual preferred unit distributions													(936)	(936)	(936)
Earnings allocated to unvested shares													(851)	(760)	(747)
Net income attributable to common unitholders - basic and diluted													$ 115,466	$ 116,557	$ 105,567
Denominator:
Weighted average units outstanding - basic and diluted (in shares)													297,258,000	296,455,000	276,848,000
Effect of dilutive securities, stock-based compensation plans (in shares)													1,000	775,000	454,000
Effect of dilutive securities, exchangeable senior notes (in shares)													0	819,000	266,000
Weighted average shares outstanding - diluted (in shares)													297,259,000	298,049,000	277,568,000
Earnings per unit - basic and diluted (in dollars per share)	$ 0.13	$ 0.10	$ 0.10	$ 0.06	$ 0.11	$ 0.12	$ 0.10	$ 0.06	$ 0.11	$ 0.12	$ 0.09	$ 0.06	$ 0.39	$ 0.39	$ 0.38
Antidilutive shares and LTIP units (in shares)													485,865	834,267	800,746

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Related Party Transactions - QIA (Details) - Q REIT Holding LLC - USD ($)		12 Months Ended
	Aug. 23, 2016	Dec. 31, 2018
Noncontrolling Interest [Line Items]
Minimum interest required to be held by affiliate of QIA in order to purchase new equity securities	5.00%
Threshold of equity securities issuance where top up rights are exercisable	$ 1,000,000.0
Right to first offer to co-Invest, period (in months)		30 months
JV partnership, term (in years)		5 years
Extended term, if one joint venture transaction consummates (in days)		30 months
Threshold to indemnify	10.00%

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Related Party Transactions - Tax Protection Agreement (Details) - Malkin Group $ in Millions	Oct. 07, 2013 USD ($) property
Related Party Transaction [Line Items]
Number of properties protected | property	4
Aggregate number of operating partnership units and common stock threshold during tax protection period	50.00%
Bottom dollar guarantee of aggregate indebtedness during tax protection period | $	$ 160.0

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Related Party Transactions - Registration Rights (Details) - Registration rights agreement	12 Months Ended
	Dec. 31, 2018 USD ($) $ / underwritten_offering underwritten_offering
Related Party Transaction [Line Items]
Number of underwritten offerings, maximum, during 12-month period following shelf effective date | underwritten_offering	2
Primary shares cutback value, minimum | $	$ 25,000,000
Payments for fees and registration per underwritten offering, maximum (in dollars per offering) | $ / underwritten_offering	25,000
Certain persons receiving common stock or operating partnership units in formation transactions
Related Party Transaction [Line Items]
Registrable shares market value, minimum | $	$ 150,000,000.0
Number of underwritten offerings, maximum | underwritten_offering	4

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Related Party Transactions - Excluded Properties and Businesses (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) office_and_property property interest	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Retail | Manhattan
Related Party Transaction [Line Items]
Number of properties (in properties) | office_and_property	4
Office Building
Related Party Transaction [Line Items]
Number of properties (in properties) | office_and_property	14
Office Building | Manhattan
Related Party Transaction [Line Items]
Number of properties (in properties) | office_and_property	9
Malkin Group | Mezzanine and Senior Equity Funds
Related Party Transaction [Line Items]
Number of interests owned (interest) | interest	2
Malkin Group | Residential Property Manager
Related Party Transaction [Line Items]
Number of properties (in properties) | interest	5
Number of interests owned (interest) | interest	5
Malkin Group | Multi-family Property | Greenwich, Connecticut
Related Party Transaction [Line Items]
Number of properties (in properties)	8
Malkin Group | Retail | Greenwich, Connecticut
Related Party Transaction [Line Items]
Number of properties (in properties)	5
Malkin Group | Retail | Manhattan
Related Party Transaction [Line Items]
Number of properties (in properties)	2
Malkin Group | Former Post Office | Greenwich, Connecticut
Related Party Transaction [Line Items]
Number of properties (in properties)	1
Malkin Group | Office Building | Manhattan
Related Party Transaction [Line Items]
Number of properties (in properties)	1
Supervisory fee revenue | Third party management and other fees | Affiliated Entity
Related Party Transaction [Line Items]
Revenue from related parties | $	$ 1.1	$ 1.1	$ 1.4
Property management fee revenue | Third party management and other fees | Affiliated Entity
Related Party Transaction [Line Items]
Revenue from related parties | $	$ 0.3	$ 0.3	$ 0.4

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Related Party Transactions - Other (Details)	1 Months Ended	12 Months Ended
	Aug. 31, 2016 ft² property	Dec. 31, 2018 USD ($) ft² director	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) ft² property
Related Party Transaction [Line Items]
Area of real estate property (in sqft) | ft²		10,100,000
Number of directors (in directors) | director		1
Affiliated Entity | Leased space rental
Related Party Transaction [Line Items]
Revenue from related parties				$ 200,000
Area of real estate property (in sqft) | ft²				3,074
Number of properties (in properties) | property				1
Affiliated Entity | Annualized rent revenue
Related Party Transaction [Line Items]
Revenue from related parties		$ 4,500,000	$ 5,800,000
Undivided Interest
Related Party Transaction [Line Items]
Area of real estate property (in sqft) | ft²	5,351			647
Chairman emeritus | Leased space rental
Related Party Transaction [Line Items]
Number of properties (in properties) | property	1
Lease cancellation, period of notice	90 days
Percentage of lease space occupied by Chairman emeritus and employee	15.00%
Revenue from related parties, net of payment for pro rata share of leased space		$ 300,000	$ 400,000	$ 100,000
Chairman emeritus | Purchase of miscellaneous furniture and artwork
Related Party Transaction [Line Items]
Revenue from related parties				$ 23,300

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Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Current federal tax	$ (2,389)	$ (3,923)	$ (3,632)
Current state and local tax	(2,253)	(2,304)	(2,055)
Total current tax	(4,642)	(6,227)	(5,687)
Deferred federal tax	0	(446)	(291)
Deferred state and local tax	0	0	(168)
Total deferred tax	0	(446)	(459)
Income tax expense	$ (4,642)	$ (6,673)	$ (6,146)
Effective income tax rate, percent	34.00%	48.50%	44.80%
Federal tax expense at statutory rate	$ (2,844)	$ (4,684)	$ (4,629)
State income taxes, net of federal benefit	(1,798)	(1,543)	(1,517)
Corporate income tax rate adjustment	$ 0	(446)	$ 0
Increase in income tax expense		400
Deferred assets decrease		$ 400

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Income Taxes - Schedule of Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Deferred revenue on unredeemed observatory admission ticket sales	$ 1,396	$ 1,395	$ 198

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Segment Reporting - Reportable Segments (Details)	12 Months Ended
	Dec. 31, 2018 segment
Segment Reporting [Abstract]
Number of reportable segments (segment)	2

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Segment Reporting - Segment Revenue and Profit or Loss Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]
Rental revenue													$ 493,231	$ 483,944	$ 460,653
Intercompany rental revenue													0	0	0
Tenant expense reimbursement													72,372	73,679	73,459
Observatory revenue													131,227	127,118	124,814
Lease termination fees													20,847	13,551	7,676
Third-party management and other fees													1,440	1,400	1,766
Other revenue and fees													12,394	9,834	8,985
Total revenues	$ 199,309	$ 186,402	$ 178,529	$ 167,271	$ 182,297	$ 186,547	$ 176,349	$ 164,333	$ 178,807	$ 175,704	$ 165,785	$ 157,057	731,511	709,526	677,353
Operating expenses:
Property operating expenses													167,379	163,531	153,850
Intercompany rent expense													0	0	0
Ground rent expense													9,326	9,326	9,326
General and administrative expenses													52,674	50,315	49,078
Observatory expenses													32,767	30,275	29,833
Real estate taxes													110,000	102,466	96,061
Acquisition expenses													0	0	98
Depreciation and amortization													168,508	160,710	155,211
Total operating expenses													540,654	516,623	493,457
Total operating income	58,490	48,538	49,665	34,164	50,191	56,008	50,659	36,045	52,195	53,442	44,162	34,097	190,857	192,903	183,896
Other income (expense):
Interest income													10,661	2,942	647
Interest expense													(79,623)	(68,473)	(70,595)
Loss on early extinguishment of debt													0	(2,157)	(552)
Loss from derivative financial instruments													0	(289)	0
Income before income taxes													121,895	124,926	113,396
Income tax expense													(4,642)	(6,673)	(6,146)
Net income	39,781	$ 29,230	$ 30,184	$ 18,058	32,260	$ 35,489	$ 31,359	$ 19,145	33,008	$ 32,897	$ 24,640	$ 16,705	117,253	118,253	107,250
Segment assets	4,195,780				3,931,347				3,890,953				4,195,780	3,931,347	3,890,953
Expenditures for segment assets													256,496	228,162	197,680
Intersegment Elimination
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]
Rental revenue													0	0	0
Intercompany rental revenue													(79,954)	(77,646)	(75,658)
Tenant expense reimbursement													0	0	0
Observatory revenue													0	0	0
Lease termination fees													0	0	0
Third-party management and other fees													0	0	0
Other revenue and fees													0	0	0
Total revenues													(79,954)	(77,646)	(75,658)
Operating expenses:
Property operating expenses													0	0	0
Intercompany rent expense													(79,954)	(77,646)	(75,658)
Ground rent expense													0	0	0
General and administrative expenses													0	0	0
Observatory expenses													0	0	0
Real estate taxes													0	0	0
Acquisition expenses															0
Depreciation and amortization													0	0	0
Total operating expenses													(79,954)	(77,646)	(75,658)
Total operating income													0	0	0
Other income (expense):
Interest income													0	0	0
Interest expense													0	0	0
Loss on early extinguishment of debt														0	0
Loss from derivative financial instruments														0
Income before income taxes													0	0	0
Income tax expense													0	0	0
Net income													0	0	0
Segment assets	0				0				0				0	0	0
Expenditures for segment assets													0	0	0
Real Estate | Operating Segments
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]
Rental revenue													493,231	483,944	460,653
Intercompany rental revenue													79,954	77,646	75,658
Tenant expense reimbursement													72,372	73,679	73,459
Observatory revenue													0	0	0
Lease termination fees													20,847	13,551	7,676
Third-party management and other fees													1,440	1,400	1,766
Other revenue and fees													12,394	9,834	8,970
Total revenues													680,238	660,054	628,182
Operating expenses:
Property operating expenses													167,379	163,531	153,850
Intercompany rent expense													0	0	0
Ground rent expense													9,326	9,326	9,326
General and administrative expenses													52,674	50,315	49,078
Observatory expenses													0	0	0
Real estate taxes													110,000	102,466	96,061
Acquisition expenses															98
Depreciation and amortization													168,430	160,630	154,817
Total operating expenses													507,809	486,268	463,230
Total operating income													172,429	173,786	164,952
Other income (expense):
Interest income													10,661	2,942	647
Interest expense													(79,623)	(68,473)	(70,595)
Loss on early extinguishment of debt														(2,157)	(552)
Loss from derivative financial instruments														(289)
Income before income taxes													103,467	105,809	94,452
Income tax expense													(1,114)	(1,306)	(1,361)
Net income													102,353	104,503	93,091
Segment assets	3,930,330				3,670,907				3,641,844				3,930,330	3,670,907	3,641,844
Expenditures for segment assets													201,685	191,541	197,680
Observatory | Operating Segments
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]
Rental revenue													0	0	0
Intercompany rental revenue													0	0	0
Tenant expense reimbursement													0	0	0
Observatory revenue													131,227	127,118	124,814
Lease termination fees													0	0	0
Third-party management and other fees													0	0	0
Other revenue and fees													0	0	15
Total revenues													131,227	127,118	124,829
Operating expenses:
Property operating expenses													0	0	0
Intercompany rent expense													79,954	77,646	75,658
Ground rent expense													0	0	0
General and administrative expenses													0	0	0
Observatory expenses													32,767	30,275	29,833
Real estate taxes													0	0	0
Acquisition expenses															0
Depreciation and amortization													78	80	394
Total operating expenses													112,799	108,001	105,885
Total operating income													18,428	19,117	18,944
Other income (expense):
Interest income													0	0	0
Interest expense													0	0	0
Loss on early extinguishment of debt														0	0
Loss from derivative financial instruments														0
Income before income taxes													18,428	19,117	18,944
Income tax expense													(3,528)	(5,367)	(4,785)
Net income													14,900	13,750	14,159
Segment assets	$ 265,450				$ 260,440				$ 249,109				265,450	260,440	249,109
Expenditures for segment assets													$ 54,811	$ 36,621	$ 0

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Summary of Quarterly Financial Information (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 199,309	$ 186,402	$ 178,529	$ 167,271	$ 182,297	$ 186,547	$ 176,349	$ 164,333	$ 178,807	$ 175,704	$ 165,785	$ 157,057	$ 731,511	$ 709,526	$ 677,353
Operating income	58,490	48,538	49,665	34,164	50,191	56,008	50,659	36,045	52,195	53,442	44,162	34,097	190,857	192,903	183,896
Net income	39,781	29,230	30,184	18,058	32,260	35,489	31,359	19,145	33,008	32,897	24,640	16,705	117,253	118,253	107,250
Net income attributable to common unitholders	$ 39,547	$ 28,996	$ 29,950	$ 17,824	$ 32,026	$ 35,255	$ 31,125	$ 18,911	$ 32,774	$ 32,663	$ 24,406	$ 16,471	$ 116,317	$ 117,317	$ 106,314
Basic and diluted net income per share (in dollars per share)	$ 0.13	$ 0.10	$ 0.10	$ 0.06	$ 0.11	$ 0.12	$ 0.10	$ 0.06	$ 0.11	$ 0.12	$ 0.09	$ 0.06	$ 0.39	$ 0.39	$ 0.38

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Schedule II - Valuation and Qualifying Accounts (Details) - SEC Schedule, 12-09, Allowance, Credit Loss [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning of Year	$ 1,607	$ 3,723	$ 3,037
Additions Charged Against Operations	(811)	(1,650)	908
Uncollectible Accounts Written-Off	(289)	(466)	(222)
Balance at End of Year	$ 507	$ 1,607	$ 3,723

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Schedule III - Real Estate and Accumulated Depreciation Schedule of Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 608,567
Initial Cost to the Company
Land	199,287
Building & Improvements	918,018
Cost Capitalized Subsequent to Acquisition
Improvements	1,767,181
Gross Amount at which Carried
Land	209,183
Buildings & Improvements	2,675,303
Total	2,884,486	$ 2,667,655	$ 2,458,629	$ 2,276,330
Accumulated Depreciation	(747,304)	$ (656,900)	$ (556,546)	$ (465,584)
111 West 33rd Street, New York, NY | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land	13,630
Building & Improvements	244,461
Cost Capitalized Subsequent to Acquisition
Improvements	106,780
Gross Amount at which Carried
Land	13,630
Buildings & Improvements	351,241
Total	364,871
Accumulated Depreciation	(41,629)
1400 Broadway | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land	0
Building & Improvements	96,338
Cost Capitalized Subsequent to Acquisition
Improvements	40,261
Gross Amount at which Carried
Land	0
Buildings & Improvements	136,599
Total	136,599
Accumulated Depreciation	(31,601)
1333 Broadway, New York, NY | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	158,484
Initial Cost to the Company
Land	91,435
Building & Improvements	120,190
Cost Capitalized Subsequent to Acquisition
Improvements	7,491
Gross Amount at which Carried
Land	91,435
Buildings & Improvements	127,681
Total	219,116
Accumulated Depreciation	(22,331)
1350 Broadway, New York, NY | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land	0
Building & Improvements	102,518
Cost Capitalized Subsequent to Acquisition
Improvements	27,161
Gross Amount at which Carried
Land	0
Buildings & Improvements	129,679
Total	129,679
Accumulated Depreciation	(25,312)
250 West 57th Street, New York, NY | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land	2,117
Building & Improvements	5,041
Cost Capitalized Subsequent to Acquisition
Improvements	141,581
Gross Amount at which Carried
Land	2,117
Buildings & Improvements	146,622
Total	148,739
Accumulated Depreciation	(36,058)
501 Seventh Avenue, New York, NY | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land	1,100
Building & Improvements	2,600
Cost Capitalized Subsequent to Acquisition
Improvements	94,778
Gross Amount at which Carried
Land	1,100
Buildings & Improvements	97,378
Total	98,478
Accumulated Depreciation	(43,164)
1359 Broadway, New York, NY | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land	1,233
Building & Improvements	1,809
Cost Capitalized Subsequent to Acquisition
Improvements	57,938
Gross Amount at which Carried
Land	1,233
Buildings & Improvements	59,747
Total	60,980
Accumulated Depreciation	(26,549)
350 Fifth Avenue (Empire State Building), New York, NY | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land	21,551
Building & Improvements	38,934
Cost Capitalized Subsequent to Acquisition
Improvements	895,989
Gross Amount at which Carried
Land	21,551
Buildings & Improvements	934,923
Total	956,474
Accumulated Depreciation	(211,068)
One Grand Central Place, New York, NY | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land	7,240
Building & Improvements	17,490
Cost Capitalized Subsequent to Acquisition
Improvements	241,218
Gross Amount at which Carried
Land	7,222
Buildings & Improvements	258,726
Total	265,948
Accumulated Depreciation	(109,502)
First Stamford Place, Stamford, CT | office
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	178,616
Initial Cost to the Company
Land	22,952
Building & Improvements	122,739
Cost Capitalized Subsequent to Acquisition
Improvements	63,292
Gross Amount at which Carried
Land	24,862
Buildings & Improvements	184,121
Total	208,983
Accumulated Depreciation	(78,570)
One Station Place, Stamford, CT (Metro Center) | office
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	91,592
Initial Cost to the Company
Land	5,313
Building & Improvements	28,602
Cost Capitalized Subsequent to Acquisition
Improvements	15,301
Gross Amount at which Carried
Land	5,313
Buildings & Improvements	43,903
Total	49,216
Accumulated Depreciation	(30,763)
383 Main Avenue, Norwalk, CT | office
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	29,614
Initial Cost to the Company
Land	2,262
Building & Improvements	12,820
Cost Capitalized Subsequent to Acquisition
Improvements	22,253
Gross Amount at which Carried
Land	2,262
Buildings & Improvements	35,073
Total	37,335
Accumulated Depreciation	(12,876)
500 Mamaroneck Avenue, Harrison, NY | office
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land	4,571
Building & Improvements	25,915
Cost Capitalized Subsequent to Acquisition
Improvements	22,198
Gross Amount at which Carried
Land	4,571
Buildings & Improvements	48,113
Total	52,684
Accumulated Depreciation	(23,147)
10 Bank Street, White Plains, NY | office
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	33,316
Initial Cost to the Company
Land	5,612
Building & Improvements	31,803
Cost Capitalized Subsequent to Acquisition
Improvements	18,412
Gross Amount at which Carried
Land	5,612
Buildings & Improvements	50,215
Total	55,827
Accumulated Depreciation	(21,134)
10 Union Square, New York, NY | retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	49,116
Initial Cost to the Company
Land	5,003
Building & Improvements	12,866
Cost Capitalized Subsequent to Acquisition
Improvements	1,966
Gross Amount at which Carried
Land	5,003
Buildings & Improvements	14,832
Total	19,835
Accumulated Depreciation	(7,801)
1542 Third Avenue, New York, NY | retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	29,459
Initial Cost to the Company
Land	2,239
Building & Improvements	15,266
Cost Capitalized Subsequent to Acquisition
Improvements	425
Gross Amount at which Carried
Land	2,239
Buildings & Improvements	15,691
Total	17,930
Accumulated Depreciation	(7,774)
1010 Third Avenue, New York, NY and 77 West 55th Street, New York, NY | retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	38,370
Initial Cost to the Company
Land	4,462
Building & Improvements	15,817
Cost Capitalized Subsequent to Acquisition
Improvements	783
Gross Amount at which Carried
Land	4,462
Buildings & Improvements	16,600
Total	21,062
Accumulated Depreciation	(8,590)
69-97 Main Street, Westport, CT | retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land	2,782
Building & Improvements	15,766
Cost Capitalized Subsequent to Acquisition
Improvements	1,046
Gross Amount at which Carried
Land	2,782
Buildings & Improvements	16,812
Total	19,594
Accumulated Depreciation	(7,113)
103-107 Main Street, Westport, CT | retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land	1,243
Building & Improvements	7,043
Cost Capitalized Subsequent to Acquisition
Improvements	321
Gross Amount at which Carried
Land	1,260
Buildings & Improvements	7,347
Total	8,607
Accumulated Depreciation	(2,322)
Property for development at the Transportation Hub in Stamford, CT | land
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land	4,542
Building & Improvements	0
Cost Capitalized Subsequent to Acquisition
Improvements	7,987
Gross Amount at which Carried
Land	12,529
Buildings & Improvements	0
Total	12,529
Accumulated Depreciation	$ 0

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Schedule III - Real Estate and Accumulated Depreciation Reconciliation of Investment Properties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance, beginning of year	$ 2,667,655	$ 2,458,629	$ 2,276,330
Acquisition of new properties	0	0	0
Improvements	256,496	228,162	197,680
Disposals	(39,665)	(19,136)	(15,381)
Balance, end of year	2,884,486	$ 2,667,655	$ 2,458,629
Aggregate cost of investment properties for federal income tax purpose	$ 2,500,000

XML

Schedule III - Real Estate and Accumulated Depreciation Reconciliation of Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance, beginning of year	$ 656,900	$ 556,546	$ 465,584
Depreciation expense	130,069	119,490	106,343
Disposals	(39,665)	(19,136)	(15,381)
Balance, end of year	$ 747,304	$ 656,900	$ 556,546

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Schedule III - Real Estate and Accumulated Depreciation Schedule of Estimated Useful Lives of Investment Properties (Details)	12 Months Ended
	Dec. 31, 2018
Building [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Estimated original useful lives (in years)	39 years
Building Improvements [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Estimated original useful lives (in years)	39 years

XML

Label	Element	Value
Derivative Financial Instruments Included in Prepaid Expenses and Other Assets	esrt_DerivativeFinancialInstrumentsIncludedinPrepaidExpensesandOtherAssets	$ 614,000
Derivative Financial Instruments Included in Prepaid Expenses and Other Assets	esrt_DerivativeFinancialInstrumentsIncludedinPrepaidExpensesandOtherAssets	0
Derivative Financial Instruments Included in Prepaid Expenses and Other Assets	esrt_DerivativeFinancialInstrumentsIncludedinPrepaidExpensesandOtherAssets	2,536,000
Derivative Financial Instruments Included in Accounts Payable and Accrued Expense	esrt_DerivativeFinancialInstrumentsIncludedinAccountsPayableandAccruedExpense	5,591,000
Derivative Financial Instruments Included in Accounts Payable and Accrued Expense	esrt_DerivativeFinancialInstrumentsIncludedinAccountsPayableandAccruedExpense	436,000
Derivative Financial Instruments Included in Accounts Payable and Accrued Expense	esrt_DerivativeFinancialInstrumentsIncludedinAccountsPayableandAccruedExpense	$ 5,243,000