Description of Business and Organization	6 Months Ended
Jun. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Organization	Description of Business and Organization As used in these condensed consolidated financial statements, unless the context otherwise requires, “we,” “us,” "our," the "company,” and "ESRT" mean our predecessor (as defined below) for the periods presented and Empire State Realty Trust, Inc. and its consolidated subsidiaries upon the consummation of its initial public offering of Class A common stock (the "Offering") and the formation transactions defined below. We are a self-administered and self-managed real estate investment trust, or REIT, that owns, manages, operates, acquires, redevelops and repositions office and retail properties in Manhattan and the greater New York metropolitan area. As of June 30, 2014, our total portfolio contained 8.4 million rentable square feet of office and retail space. We owned 12 office properties (including one long-term ground leasehold interest) encompassing approximately 7.8 million rentable square feet of office space. Seven of these properties are located in the midtown Manhattan market and encompass in the aggregate approximately 5.9 million rentable square feet of office space, including the Empire State Building. Our Manhattan office properties also contain an aggregate of 415,339 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 June 30, 2014, 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 204,175 rentable square feet in the aggregate. Subsequent to June 30, 2014, on July 15, 2014, we completed the acquisition of the ground and operating leases at 112 West 34th Street (and the fee title to 122 West 34th Street) and the ground lease at 1400 Broadway. These two office properties are located in midtown Manhattan and encompass approximately 1.5 million rentable square feet of office space and approximately 112,270 rentable square feet of retail space. We were organized as a Maryland corporation on July 29, 2011. We did not have any assets other than cash and did not have any meaningful operating activity until the consummation of the Offering and the related acquisition of the assets of our predecessor and certain non-controlled entities controlled by our predecessor on October 7, 2013, as described in the financial statements for the year ended December 31, 2013 contained in our Annual Report on Form 10-K. Our operations commenced upon completion of the Offering and related formation transactions on October 7, 2013. Empire State Realty OP, L.P. holds substantially all of our assets and conducts substantially all of our business. As of June 30, 2014, we owned approximately 38.9% of the aggregate operating partnership units in our operating partnership. We, as the sole general partner of our operating partnership, have responsibility and discretion in the management and control of our operating partnership, and the limited partners of our operating partnership, in such capacity, have no authority to transact business for, or participate in the management activities of our operating partnership. Accordingly, our operating partnership has been consolidated by us. We intend to elect to be taxed as a REIT and operate in a manner that we believe allows us to qualify as a REIT for federal income tax purposes commencing with our taxable year ended December 31, 2013. We formed and acquired two entities that have elected to be treated as taxable REIT subsidiaries, or TRSs, and are owned by our operating partnership. 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 fitness center, property management and leasing, construction, and property maintenance. For all periods prior to the completion of the Offering and formation transactions, our predecessor results of operations contain unconsolidated results for certain non-controlled entities (as defined below) that owned interests in the Empire State Building, 1350 Broadway, 1333 Broadway, and 501 Seventh Avenue, which were accounted for by our predecessor under the equity method of accounting and make up a significant portion of our company subsequent to the completion of the Offering and formation transactions. Our results of operations for the three and six months ended June 30, 2013 reflect the financial condition and results of operations of our predecessor. Our financial condition as of June 30, 2014 and December 31, 2013 and results of operations for the three and six months ended June 30, 2014 reflect the financial condition and results of operations of our predecessor consolidated with the non-controlling interests in those four properties we acquired at the time of the Offering and formation transactions. The Predecessor Our predecessor is not a legal entity but rather a combination of (i) controlling interests in (a) 16 office and retail properties, (b) one development parcel, and (c) certain management companies, which were owned by certain entities that Anthony E. Malkin and Peter L. Malkin, as sponsors, owned interests in and controlled, which we collectively refer to as the controlled entities, and (ii) non-controlling interests in four office properties (which include two of the 16 properties set forth in (i) above), held through entities which we collectively refer to as the "non-controlled entities," and are presented as uncombined entities in our consolidated financial statements. Specifically, the term “our predecessor” means (i) Malkin Holdings LLC, a New York limited liability company that acted as the supervisor of, and performed various asset management services and routine administration with respect to, certain of the existing entities, which we refer to as “the supervisor;” (ii) the limited liability companies or limited partnerships that previously (a) owned, directly or indirectly and either through a fee interest or a long-term leasehold in the underlying land, and/or (b) operated, directly or indirectly and through a fee interest, an operating lease, an operating sublease or an operating sub-sublease, the 18 office and retail properties (which include non-controlling interests in four office properties for which Malkin Holdings LLC acted as the supervisor but that are not consolidated into our predecessor for accounting purposes) and entitled land that will support the development of an approximately 380,000 rentable square foot office building and garage that we own after the formation transactions, which we refer to as the “existing entities;” (iii) Malkin Properties, L.L.C., a New York limited liability company that served as the manager and leasing agent for certain of the existing entities in Manhattan, which we refer to as “Malkin Properties;” (iv) Malkin Properties of New York, L.L.C., a New York limited liability company that served as the manager and leasing agent for certain of the existing entities in Westchester County, New York, which we refer to as “Malkin Properties NY;” (v) Malkin Properties of Connecticut, Inc., a Connecticut corporation that served as the manager and leasing agent for certain of the existing entities in the State of Connecticut, which we refer to as “Malkin Properties CT;” and (vi) Malkin Construction Corp., a Connecticut corporation that is a general contractor and provided services to certain of the existing entities and third parties (including certain tenants at the properties in our portfolio), which we refer to as “Malkin Construction.” The term “the predecessor’s management companies” refers to the supervisor, Malkin Properties, Malkin Properties NY, Malkin Properties CT and Malkin Construction, collectively. Our predecessor accounted for its investment in the non-controlled entities under the equity method of accounting. Controlled Entities: Properties that the sponsors owned interests in and controlled, and whose operations were 100% consolidated into the financial statements of our predecessor include: Office: One Grand Central Place, New York, New York 250 West 57th Street, New York, New York 1359 Broadway, New York, New York First Stamford Place, Stamford, Connecticut Metro Center, Stamford, Connecticut 383 Main Avenue, Norwalk, Connecticut 500 Mamaroneck Avenue, Harrison, New York 10 Bank Street, White Plains, New York Fee ownership position of 350 Fifth Avenue (Empire State Building), New York, New York Fee ownership position of 501 Seventh Avenue, New York, New York Retail: 10 Union Square, New York, New York 1010 Third Avenue, New York, New York 77 West 55th Street, New York, New York 1542 Third Avenue, New York, New York 69-97 Main Street, Westport, Connecticut 103-107 Main Street, Westport, Connecticut Land Parcels: We own 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. The acquisition of interests in our predecessor were recorded at historical cost at the time of the formation transactions. Non-Controlled Entities: Properties in which the sponsors owned and controlled non-controlling interests and whose operations are reflected in our predecessor’s consolidated financial statements as an equity interest include: Office: Master operating lease position of 350 Fifth Avenue, New York, New York—Empire State Building Company L.L.C. Master operating lease position of 1350 Broadway, New York, New York—1350 Broadway Associates L.L.C. (long term ground lease) 1333 Broadway, New York, New York—1333 Broadway Associates L.L.C. Master operating lease position of 501 Seventh Avenue, New York, New York—501 Seventh Avenue Associates L.L.C.

Description of Business and Organization

As used in these condensed consolidated financial statements, unless the context otherwise requires, “we,” “us,” "our," the "company,” and "ESRT" mean our predecessor (as defined below) for the periods presented and Empire State Realty Trust, Inc. and its consolidated subsidiaries upon the consummation of its initial public offering of Class A common stock (the "Offering") and the formation transactions defined below.

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

As of June 30, 2014, our total portfolio contained 8.4 million rentable square feet of office and retail space. We owned 12 office properties (including one long-term ground leasehold interest) encompassing approximately 7.8 million rentable square feet of office space. Seven of these properties are located in the midtown Manhattan market and encompass in the aggregate approximately 5.9 million rentable square feet of office space, including the Empire State Building. Our Manhattan office properties also contain an aggregate of 415,339 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 June 30, 2014, 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 204,175 rentable square feet in the aggregate.

Subsequent to June 30, 2014, on July 15, 2014, we completed the acquisition of the ground and operating leases at 112 West 34th Street (and the fee title to 122 West 34th Street) and the ground lease at 1400 Broadway. These two office properties are located in midtown Manhattan and encompass approximately 1.5 million rentable square feet of office space and approximately 112,270 rentable square feet of retail space.

We were organized as a Maryland corporation on July 29, 2011. We did not have any assets other than cash and did not have any meaningful operating activity until the consummation of the Offering and the related acquisition of the assets of our predecessor and certain non-controlled entities controlled by our predecessor on October 7, 2013, as described in the financial statements for the year ended December 31, 2013 contained in our Annual Report on Form 10-K.

Our operations commenced upon completion of the Offering and related formation transactions on October 7, 2013. Empire State Realty OP, L.P. holds substantially all of our assets and conducts substantially all of our business. As of June 30, 2014, we owned approximately 38.9% of the aggregate operating partnership units in our operating partnership. We, as the sole general partner of our operating partnership, have responsibility and discretion in the management and control of our operating partnership, and the limited partners of our operating partnership, in such capacity, have no authority to transact business for, or participate in the management activities of our operating partnership. Accordingly, our operating partnership has been consolidated by us. We intend to elect to be taxed as a REIT and operate in a manner that we believe allows us to qualify as a REIT for federal income tax purposes commencing with our taxable year ended December 31, 2013.

We formed and acquired two entities that have elected to be treated as taxable REIT subsidiaries, or TRSs, and are owned by our operating partnership. 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 fitness center, property management and leasing, construction, and property maintenance.

For all periods prior to the completion of the Offering and formation transactions, our predecessor results of operations contain unconsolidated results for certain non-controlled entities (as defined below) that owned interests in the Empire State Building, 1350 Broadway, 1333 Broadway, and 501 Seventh Avenue, which were accounted for by our predecessor under the equity method of accounting and make up a significant portion of our company subsequent to the completion of the Offering and formation transactions. Our results of operations for the three and six months ended June 30, 2013 reflect the financial condition and results of operations of our predecessor. Our financial condition as of June 30, 2014 and December 31, 2013 and results of operations for the three and six months ended June 30, 2014 reflect the financial condition and results of operations of our predecessor consolidated with the non-controlling interests in those four properties we acquired at the time of the Offering and formation transactions.

The Predecessor

Our predecessor is not a legal entity but rather a combination of (i) controlling interests in (a) 16 office and retail properties, (b) one development parcel, and (c) certain management companies, which were owned by certain entities that Anthony E. Malkin and Peter L. Malkin, as sponsors, owned interests in and controlled, which we collectively refer to as the controlled entities, and (ii) non-controlling interests in four office properties (which include two of the 16 properties set forth in (i) above), held through entities which we collectively refer to as the "non-controlled entities," and are presented as uncombined entities in our consolidated financial statements. Specifically, the term “our predecessor” means (i) Malkin Holdings LLC, a New York limited liability company that acted as the supervisor of, and performed various asset management services and routine administration with respect to, certain of the existing entities, which we refer to as “the supervisor;” (ii) the limited liability companies or limited partnerships that previously (a) owned, directly or indirectly and either through a fee interest or a long-term leasehold in the underlying land, and/or (b) operated, directly or indirectly and through a fee interest, an operating lease, an operating sublease or an operating sub-sublease, the 18 office and retail properties (which include non-controlling interests in four office properties for which Malkin Holdings LLC acted as the supervisor but that are not consolidated into our predecessor for accounting purposes) and entitled land that will support the development of an approximately 380,000 rentable square foot office building and garage that we own after the formation transactions, which we refer to as the “existing entities;” (iii) Malkin Properties, L.L.C., a New York limited liability company that served as the manager and leasing agent for certain of the existing entities in Manhattan, which we refer to as “Malkin Properties;” (iv) Malkin Properties of New York, L.L.C., a New York limited liability company that served as the manager and leasing agent for certain of the existing entities in Westchester County, New York, which we refer to as “Malkin Properties NY;” (v) Malkin Properties of Connecticut, Inc., a Connecticut corporation that served as the manager and leasing agent for certain of the existing entities in the State of Connecticut, which we refer to as “Malkin Properties CT;” and (vi) Malkin Construction Corp., a Connecticut corporation that is a general contractor and provided services to certain of the existing entities and third parties (including certain tenants at the properties in our portfolio), which we refer to as “Malkin Construction.” The term “the predecessor’s management companies” refers to the supervisor, Malkin Properties, Malkin Properties NY, Malkin Properties CT and Malkin Construction, collectively. Our predecessor accounted for its investment in the non-controlled entities under the equity method of accounting.

Controlled Entities:

Properties that the sponsors owned interests in and controlled, and whose operations were 100% consolidated into the financial statements of our predecessor include:

Office:

One Grand Central Place, New York, New York

250 West 57th Street, New York, New York

1359 Broadway, New York, New York

First Stamford Place, Stamford, Connecticut

Metro Center, Stamford, Connecticut

383 Main Avenue, Norwalk, Connecticut

500 Mamaroneck Avenue, Harrison, New York

10 Bank Street, White Plains, New York

Fee ownership position of 350 Fifth Avenue (Empire State Building), New York, New York

Fee ownership position of 501 Seventh Avenue, New York, New York

Retail:

10 Union Square, New York, New York

1010 Third Avenue, New York, New York

77 West 55th Street, New York, New York

1542 Third Avenue, New York, New York

69-97 Main Street, Westport, Connecticut

103-107 Main Street, Westport, Connecticut

Land Parcels:

We own 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.

The acquisition of interests in our predecessor were recorded at historical cost at the time of the formation transactions.

Non-Controlled Entities:

Properties in which the sponsors owned and controlled non-controlling interests and whose operations are reflected in our predecessor’s consolidated financial statements as an equity interest include:

Office:

Master operating lease position of 350 Fifth Avenue, New York, New York—Empire State Building Company L.L.C.

Master operating lease position of 1350 Broadway, New York, New York—1350 Broadway Associates L.L.C. (long term ground lease)

1333 Broadway, New York, New York—1333 Broadway Associates L.L.C.

Master operating lease position of 501 Seventh Avenue, New York, New York—501 Seventh Avenue Associates L.L.C.