XML 21 R37.htm IDEA: XBRL DOCUMENT v2.4.1.9
Debt - Schedule of Long term Debt (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Term loan and credit facility 0us-gaap_LineOfCredit $ 470,000us-gaap_LineOfCredit
Total 855,032us-gaap_LongTermDebt 903,985us-gaap_LongTermDebt
Mortgages [Member]    
Debt Instrument [Line Items]    
Fixed rate mortgage debt 743,979us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
746,916us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Floating rate mortgage debt 91,000us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
135,146us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Total mortgage debt 834,979esrt_LongTermDebtFixedRateDebtandFloatingRateDebtLessCreditFacilityandUnsecuredNotesTotal
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
882,062esrt_LongTermDebtFixedRateDebtandFloatingRateDebtLessCreditFacilityandUnsecuredNotesTotal
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Total principal 1,599,979us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
1,602,062us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Unamortized premiums, net of unamortized discount 8,388us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
9,590us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Total 1,608,367us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
1,611,652us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Mortgages [Member] | 10 Union Square [Member]    
Debt Instrument [Line Items]    
Fixed rate mortgage debt 20,551us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt10UnionSquareMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
20,641us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt10UnionSquareMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Stated Rate 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt10UnionSquareMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
 
Effective Rate 6.67%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt10UnionSquareMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
[1]  
Mortgages [Member] | 10 Bank Street [Member]    
Debt Instrument [Line Items]    
Fixed rate mortgage debt 32,692us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt10BankStreetMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
32,847us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt10BankStreetMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Stated Rate 5.72%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt10BankStreetMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
 
Effective Rate 6.21%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt10BankStreetMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
[1]  
Mortgages [Member] | 1542 Third Avenue [Member]    
Debt Instrument [Line Items]    
Fixed rate mortgage debt 18,525us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt1542ThirdAvenueMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
18,628us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt1542ThirdAvenueMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Stated Rate 5.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt1542ThirdAvenueMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
 
Effective Rate 6.50%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt1542ThirdAvenueMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
[1]  
Mortgages [Member] | First Stamford Place [Member]    
Debt Instrument [Line Items]    
Fixed rate mortgage debt 241,384us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebtFirstStamfordPlaceMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
242,294us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebtFirstStamfordPlaceMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Stated Rate 5.65%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebtFirstStamfordPlaceMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
 
Effective Rate 6.14%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebtFirstStamfordPlaceMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
[1]  
Mortgages [Member] | 1010 Third Avenue and 77 West 55th Street [Member]    
Debt Instrument [Line Items]    
Fixed rate mortgage debt 27,465us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt1010ThirdAvenueand77West55thStreetMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
27,595us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt1010ThirdAvenueand77West55thStreetMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Stated Rate 5.69%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt1010ThirdAvenueand77West55thStreetMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
 
Effective Rate 6.36%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt1010ThirdAvenueand77West55thStreetMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
[1]  
Mortgages [Member] | 383 Main Avenue [Member]    
Debt Instrument [Line Items]    
Fixed rate mortgage debt 29,709us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt383MainAvenueMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
29,852us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt383MainAvenueMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Stated Rate 5.59%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt383MainAvenueMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
 
Effective Rate 5.97%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt383MainAvenueMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
[1]  
Mortgages [Member] | 1333 Broadway [Member]    
Debt Instrument [Line Items]    
Fixed rate mortgage debt 69,348us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt1333BroadwayMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
69,575us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt1333BroadwayMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Stated Rate 6.32%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt1333BroadwayMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
 
Effective Rate 3.80%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt1333BroadwayMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
[1]  
Mortgages [Member] | 1400 Broadway - First Lien [Member]    
Debt Instrument [Line Items]    
Fixed rate mortgage debt 69,455us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_A1400BroadwayFirstLienMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
69,689us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_A1400BroadwayFirstLienMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Stated Rate 6.12%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= esrt_A1400BroadwayFirstLienMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
 
Effective Rate 3.14%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= esrt_A1400BroadwayFirstLienMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
[1]  
Mortgages [Member] | 1400 Broadway - Second Lien [Member]    
Debt Instrument [Line Items]    
Fixed rate mortgage debt 9,753us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_A1400BroadwaySecondLienMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
9,803us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_A1400BroadwaySecondLienMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Stated Rate 3.35%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= esrt_A1400BroadwaySecondLienMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
 
Effective Rate 3.35%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= esrt_A1400BroadwaySecondLienMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
[1]  
Mortgages [Member] | 112 West 34th Street - First Lien [Member]    
Debt Instrument [Line Items]    
Fixed rate mortgage debt 77,221us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_A112West34thStreetFirstLienMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
77,484us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_A112West34thStreetFirstLienMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Stated Rate 6.01%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= esrt_A112West34thStreetFirstLienMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
 
Effective Rate 3.08%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= esrt_A112West34thStreetFirstLienMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
[1]  
Mortgages [Member] | 112 West 34th Street - Second Lien [Member]    
Debt Instrument [Line Items]    
Fixed rate mortgage debt 9,733us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_A112West34thStreetSecondLienMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
9,763us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_A112West34thStreetSecondLienMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Stated Rate 6.56%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= esrt_A112West34thStreetSecondLienMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
 
Effective Rate 3.36%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= esrt_A112West34thStreetSecondLienMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
[1]  
Mortgages [Member] | 1350 Broadway - First Lien Mortgage Loan [Member]    
Debt Instrument [Line Items]    
Fixed rate mortgage debt 38,765us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt1350BroadwayFirstLienMortgageLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
38,900us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt1350BroadwayFirstLienMortgageLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Stated Rate 5.87%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt1350BroadwayFirstLienMortgageLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
 
Effective Rate 3.78%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt1350BroadwayFirstLienMortgageLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
[1]  
Mortgages [Member] | Metro Center Debt [Member]    
Debt Instrument [Line Items]    
Fixed rate mortgage debt 99,378us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_MetroCenterDebtMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
99,845us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_MetroCenterDebtMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Stated Rate 3.59%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= esrt_MetroCenterDebtMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
 
Effective Rate 3.71%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= esrt_MetroCenterDebtMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
[1]  
Mortgages [Member] | Floating Rate Debt, One Grand Central Place - Third Lien [Member]    
Debt Instrument [Line Items]    
Floating rate mortgage debt 91,000us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_FloatingRateDebtOneGrandCentralPlaceThirdLienMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
91,000us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_FloatingRateDebtOneGrandCentralPlaceThirdLienMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Effective Rate 1.53%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= esrt_FloatingRateDebtOneGrandCentralPlaceThirdLienMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
 
Mortgages [Member] | Floating Rate Debt, One Grand Central Place - Third Lien [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate 1.35%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= esrt_FloatingRateDebtOneGrandCentralPlaceThirdLienMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
 
Mortgages [Member] | Fixed Rate Debt, 1359 Broadway [Member]    
Debt Instrument [Line Items]    
Floating rate mortgage debt 0us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt1359BroadwayMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
44,146us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebt1359BroadwayMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Mortgages [Member] | Floating Rate Debt - Secured Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Floating rate mortgage debt 0us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_FloatingRateDebtSecuredRevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
170,000us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_FloatingRateDebtSecuredRevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Mortgages [Member] | Secured Term Credit Facility [Member]    
Debt Instrument [Line Items]    
Floating rate mortgage debt 0us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_FloatingRateDebtSecuredTermCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
300,000us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_FloatingRateDebtSecuredTermCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Convertible Debt [Member] | Exchangeable Senior Notes due August 15, 2019 [Member]    
Debt Instrument [Line Items]    
Fixed rate mortgage debt 250,000us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_ExchangeableSeniorNotesdueAugust152019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
250,000us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_DebtInstrumentAxis
= esrt_ExchangeableSeniorNotesdueAugust152019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
Stated Rate 2.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= esrt_ExchangeableSeniorNotesdueAugust152019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
 
Effective Rate 3.93%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= esrt_ExchangeableSeniorNotesdueAugust152019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
[1]  
Senior Notes [Member] | Series A Senior Notes due 2025 [Member]    
Debt Instrument [Line Items]    
Total 100,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= esrt_SeriesASeniorNotesdue2025Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= esrt_SeriesASeniorNotesdue2025Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Stated Rate 3.93%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= esrt_SeriesASeniorNotesdue2025Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
Effective Rate 3.93%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= esrt_SeriesASeniorNotesdue2025Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
[1]  
Senior Notes [Member] | Series B Senior Notes due 2027 [Member]    
Debt Instrument [Line Items]    
Total 125,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= esrt_SeriesBSeniorNotesdue2027Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= esrt_SeriesBSeniorNotesdue2027Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Stated Rate 4.09%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= esrt_SeriesBSeniorNotesdue2027Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
Effective Rate 4.09%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= esrt_SeriesBSeniorNotesdue2027Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
[1]  
Senior Notes [Member] | Series C Senior Notes due 2030 [Member]    
Debt Instrument [Line Items]    
Total 125,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= esrt_SeriesCSeniorNotesdue2030Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= esrt_SeriesCSeniorNotesdue2030Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Stated Rate 4.18%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= esrt_SeriesCSeniorNotesdue2030Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
Effective Rate 4.18%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= esrt_SeriesCSeniorNotesdue2030Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
[1]  
Revolving Credit Facility [Member] | Unsecured Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Term loan and credit facility 165,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= esrt_UnsecuredRevolvingCreditFacilityMember
$ 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= esrt_UnsecuredRevolvingCreditFacilityMember
Effective Rate 1.33%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= esrt_UnsecuredRevolvingCreditFacilityMember
 
Revolving Credit Facility [Member] | Unsecured Revolving Credit Facility [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate 1.15%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= esrt_UnsecuredRevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
 
[1] The effective rate is the yield as of March 31, 2015, including the effects of debt issuance costs.