Sublease	6 Months Ended
Jun. 30, 2013
Leases [Abstract]
Sublease	Note D Sublease Registrant does not operate the Building. It subleases the Building to Empire State Building Company L.L.C. (“Sublessee”) pursuant to a net operating sublease (the “Sublease”) which included an initial term which expired on January 4, 1992. The Sublease provided four separate options for Sublessee to renew the term, in each case for an additional 21 years, on the terms of the original Sublease. Such renewals have been exercised by Sublessee (a) on January 30, 1989, for the first renewal period from January 5, 1992 through January 4, 2013 and (b) as of February 11, 2010, for the remaining three renewal periods from January 5, 2013 through January 4, 2076 (the last two such renewals being exercised by Sublessee with Registrant’s consent for early exercise). Sublessee is required to pay annual basic rent (“Basic Rent”) of $6,018,750 from January 1, 1992 through January 4, 2013 and $5,895,625 from January 5, 2013 through the expiration of all renewal terms. Sublessee is also required to pay Registrant overage rent of 50% of Sublessee’s net operating profit, as defined in the Sublease, in excess of $1,000,000 for each lease year ending December 31 (“Overage Rent”). In addition to the above, Sublessee is required to pay for all operating and maintenance expenses, real estate taxes, and necessary repairs and replacements, and keep the Property adequately insured against fire and accident. In accordance with the second sublease modification dated February 25, 2009, Basic Rent described above had been increased to cover debt service on the $31,500,000 second mortgage that closed on February 25, 2009. In accordance with the third sublease modification dated July 26, 2011, Basic Rent was increased to cover debt service relating to the Secured Term Loan refinancing that prepaid the first and second mortgages aggregating $92,000,000 (Note C) to the extent the Secured Term Loan debt exceeds the previous first mortgage of $60,500,000. In accordance with the fourth, fifth and sixth modifications of the Sublease, Basic Rent was further increased to cover debt service on additional advances aggregating $110,000,000 ($30,000,000 on each of April 5, 2012 and July 9, 2012 and $50,000,000 on February 26, 2013). Basic Rent increased by $1,082,806 for the six months ended June 30, 2013 as compared to the six months ended June 30, 2012, representing an increase in debt service of $1,144,369 which consists only of interest on the balance of the Secured Term Loan in excess of $60,500,000, and a decrease in Basic Rent of $61,563. Basic Rent will be increased to cover debt service on any refinancing of such debt so long as the aggregate amount refinanced does not exceed the then existing amount of debt plus refinancing costs. Due to Sublessee, a related party, of $17,435,294 and $3,146,689 at June 30, 2013 and December 31, 2012, respectively, represents the payable to Sublessee for building and tenant improvements and leasing costs. Due from Sublessee, a related party, of $8,778,000 and $15,174,264 at June 30, 2013 and December 31, 2012, respectively, represents funds held in escrow by Sublessee for tenant improvements and includes Basic Rent due from the Sublessee. Overage Rent and any interest and dividends accumulated thereon are distributed annually after deduction for any additional payment described in Note E below, other expenses and additions to general contingencies management judges to be suitable under the circumstances. Overage Rent income is recognized when earned from the Sublessee, at the close of the year ending December 31. Such income is not determinable until Sublessee, pursuant to the Sublease, provides Registrant with a certified operating report from a certified public accountant on the Sublessee’s operation of the Real Estate. The Sublease requires that this report be delivered to Registrant annually within 60 days after the end of each such fiscal year. Accordingly, all Overage Rent income and the additional payment to Supervisor are reflected in the fourth quarter of each year. The Sublease does not provide for the Sublessee to render interim reports to Registrant. On March 8, 2013, registrant made an additional distribution to participants of $13,254,000 ($4,016 for each $10,000 Participation), representing Overage Rent of $24,199,368 for the year ended December 31, 2012, less (i ) $10,094,843, mainly for fees relating to the Consolidation and IPO (as defined below) and for the increase in the supervisory fee to Supervisor, accounting fees, set-aside for a portion of interest expense and general contingencies, (ii) annual New York State filing fees of $4,525, and (iii) the Additional Payment to supervisor of $846,000 (representing the Additional Payment of $905,417 less $59,417 previously paid). See Notes C and D to the condensed consolidated financial statements herein. Sublessee is a New York limited liability company in which Peter L. Malkin is a member and entities for Peter L. Malkin’s family members are beneficial owners. The Supervisor of the Registrant has solicited consents of Participants in the Registrant and other public limited liability companies supervised by the Supervisor to a proposed consolidation of Registrant, other public and private entities supervised by the Supervisor and the Supervisor and certain affiliated management companies into Empire State Realty Trust, Inc. (collectively the “Consolidation”) and the initial public offering of Class A common stock of Empire State Realty Trust, Inc. (the “IPO”) pursuant to a prospectus/consent solicitation statement included in a registration statement on Form S-4 declared effective by the SEC. In the proposed transaction, (x) the property interests of the Registrant, such other public limited liability companies and certain private entities supervised by the Supervisor, and (y) the Supervisor and certain affiliated management companies would be contributed to the operating partnership of Empire State Realty Trust, Inc., a newly organized real estate investment trust. Consents are required from Participants in the Registrant and such other public limited liability companies for them to contribute their interests in the Consolidation. The Supervisor of the Registrant has received consents of Participants in the Registrant holding more than the required supermajority in each participating group to the Consolidation. Following the receipt of the required supermajority approval, each Participant who had voted against, or abstained, or not submitted a consent form regarding the Consolidation, was sent a 10-day buyout notice stating that its interests was subject to buyout for $100 if it did not consent to the Consolidation. The period for consenting to the Consolidation for those sent the buyout notice, as extended, has not yet terminated. Consents have been obtained from participants in the other public limited liability companies and the private entities and the Supervisor and certain affiliated companies and affiliates of the Supervisor for them to make such contributions. The consideration to be paid to the contributing companies and entities in the Consolidation will be allocated in accordance with exchange values determined based on appraisals by an independent third party.

Note D Sublease

Registrant does not operate the Building. It subleases the Building to Empire State Building Company L.L.C. (“Sublessee”) pursuant to a net operating sublease (the “Sublease”) which included an initial term which expired on January 4, 1992. The Sublease provided four separate options for Sublessee to renew the term, in each case for an additional 21 years, on the terms of the original Sublease. Such renewals have been exercised by Sublessee (a) on January 30, 1989, for the first renewal period from January 5, 1992 through January 4, 2013 and (b) as of February 11, 2010, for the remaining three renewal periods from January 5, 2013 through January 4, 2076 (the last two such renewals being exercised by Sublessee with Registrant’s consent for early exercise).

Sublessee is required to pay annual basic rent (“Basic Rent”) of $6,018,750 from January 1, 1992 through January 4, 2013 and $5,895,625 from January 5, 2013 through the expiration of all renewal terms. Sublessee is also required to pay Registrant overage rent of 50% of Sublessee’s net operating profit, as defined in the Sublease, in excess of $1,000,000 for each lease year ending December 31 (“Overage Rent”). In addition to the above, Sublessee is required to pay for all operating and maintenance expenses, real estate taxes, and necessary repairs and replacements, and keep the Property adequately insured against fire and accident.

In accordance with the second sublease modification dated February 25, 2009, Basic Rent described above had been increased to cover debt service on the $31,500,000 second mortgage that closed on February 25, 2009. In accordance with the third sublease modification dated July 26, 2011, Basic Rent was increased to cover debt service relating to the Secured Term Loan refinancing that prepaid the first and second mortgages aggregating $92,000,000 (Note C) to the extent the Secured Term Loan debt exceeds the previous first mortgage of $60,500,000. In accordance with the fourth, fifth and sixth modifications of the Sublease, Basic Rent was further increased to cover debt service on additional advances aggregating $110,000,000 ($30,000,000 on each of April 5, 2012 and July 9, 2012 and $50,000,000 on February 26, 2013). Basic Rent increased by $1,082,806 for the six months ended June 30, 2013 as compared to the six months ended June 30, 2012, representing an increase in debt service of $1,144,369 which consists only of interest on the balance of the Secured Term Loan in excess of $60,500,000, and a decrease in Basic Rent of $61,563.

Basic Rent will be increased to cover debt service on any refinancing of such debt so long as the aggregate amount refinanced does not exceed the then existing amount of debt plus refinancing costs.

Due to Sublessee, a related party, of $17,435,294 and $3,146,689 at June 30, 2013 and December 31, 2012, respectively, represents the payable to Sublessee for building and tenant improvements and leasing costs. Due from Sublessee, a related party, of $8,778,000 and $15,174,264 at June 30, 2013 and December 31, 2012, respectively, represents funds held in escrow by Sublessee for tenant improvements and includes Basic Rent due from the Sublessee.

Overage Rent and any interest and dividends accumulated thereon are distributed annually after deduction for any additional payment described in Note E below, other expenses and additions to general contingencies management judges to be suitable under the circumstances. Overage Rent income is recognized when earned from the Sublessee, at the close of the year ending December 31. Such income is not determinable until Sublessee, pursuant to the Sublease, provides Registrant with a certified operating report from a certified public accountant on the Sublessee’s operation of the Real Estate. The Sublease requires that this report be delivered to Registrant annually within 60 days after the end of each such fiscal year. Accordingly, all Overage Rent income and the additional payment to Supervisor are reflected in the fourth quarter of each year. The Sublease does not provide for the Sublessee to render interim reports to Registrant.

On March 8, 2013, registrant made an additional distribution to participants of $13,254,000 ($4,016 for each $10,000 Participation), representing Overage Rent of $24,199,368 for the year ended December 31, 2012, less (i ) $10,094,843, mainly for fees relating to the Consolidation and IPO (as defined below) and for the increase in the supervisory fee to Supervisor, accounting fees, set-aside for a portion of interest expense and general contingencies, (ii) annual New York State filing fees of $4,525, and (iii) the Additional Payment to supervisor of $846,000 (representing the Additional Payment of $905,417 less $59,417 previously paid). See Notes C and D to the condensed consolidated financial statements herein.

Sublessee is a New York limited liability company in which Peter L. Malkin is a member and entities for Peter L. Malkin’s family members are beneficial owners.

The Supervisor of the Registrant has solicited consents of Participants in the Registrant and other public limited liability companies supervised by the Supervisor to a proposed consolidation of Registrant, other public and private entities supervised by the Supervisor and the Supervisor and certain affiliated management companies into Empire State Realty Trust, Inc. (collectively the “Consolidation”) and the initial public offering of Class A common stock of Empire State Realty Trust, Inc. (the “IPO”) pursuant to a prospectus/consent solicitation statement included in a registration statement on Form S-4 declared effective by the SEC. In the proposed transaction, (x) the property interests of the Registrant, such other public limited liability companies and certain private entities supervised by the Supervisor, and (y) the Supervisor and certain affiliated management companies would be contributed to the operating partnership of Empire State Realty Trust, Inc., a newly organized real estate investment trust.

Consents are required from Participants in the Registrant and such other public limited liability companies for them to contribute their interests in the Consolidation. The Supervisor of the Registrant has received consents of Participants in the Registrant holding more than the required supermajority in each participating group to the Consolidation. Following the receipt of the required supermajority approval, each Participant who had voted against, or abstained, or not submitted a consent form regarding the Consolidation, was sent a 10-day buyout notice stating that its interests was subject to buyout for $100 if it did not consent to the Consolidation. The period for consenting to the Consolidation for those sent the buyout notice, as extended, has not yet terminated.

Consents have been obtained from participants in the other public limited liability companies and the private entities and the Supervisor and certain affiliated companies and affiliates of the Supervisor for them to make such contributions. The consideration to be paid to the contributing companies and entities in the Consolidation will be allocated in accordance with exchange values determined based on appraisals by an independent third party.