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Schedule III - Real Estate and Accumulated Depreciation Schedule of Real Estate and Accumulated Depreciation (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | $ 903,985 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances |  |  |
Initial Cost to the Company |  |  |  |
Land | 199,287 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand |  |  |
Building & Improvements | 918,018 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 1,022,558 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements |  |  |
Gross Amount at which Carried |  |  |  |
Land | 201,196 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand |  |  |
Buildings & Improvements | 1,938,667 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements |  |  |
Total | 2,139,863 us-gaap_RealEstateGrossAtCarryingValue | 1,649,423 us-gaap_RealEstateGrossAtCarryingValue | 939,330 us-gaap_RealEstateGrossAtCarryingValue | 856,151 us-gaap_RealEstateGrossAtCarryingValue
Accumulated Depreciation | (377,552)us-gaap_RealEstateAccumulatedDepreciation | (295,351)us-gaap_RealEstateAccumulatedDepreciation | (257,091)us-gaap_RealEstateAccumulatedDepreciation | (224,019)us-gaap_RealEstateAccumulatedDepreciation
112 West 34th Street [Member] | Office/Retail [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 94,720 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_A112West34thStreetMember |  |  |
Initial Cost to the Company |  |  |  |
Land | 13,630 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_A112West34thStreetMember |  |  |
Building & Improvements | 244,461 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_A112West34thStreetMember |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 4,936 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_A112West34thStreetMember |  |  |
Gross Amount at which Carried |  |  |  |
Land | 13,630 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_A112West34thStreetMember |  |  |
Buildings & Improvements | 249,397 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_A112West34thStreetMember |  |  |
Total | 263,027 us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_A112West34thStreetMember |  |  |
Accumulated Depreciation | (4,092)us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_A112West34thStreetMember |  |  |
Location 1400 Broadway [Member] | Office/Retail [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 85,256 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Location1400BroadwayMember |  |  |
Initial Cost to the Company |  |  |  |
Land | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Location1400BroadwayMember |  |  |
Building & Improvements | 96,338 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Location1400BroadwayMember |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 4,413 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Location1400BroadwayMember |  |  |
Gross Amount at which Carried |  |  |  |
Land | 0 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Location1400BroadwayMember |  |  |
Buildings & Improvements | 100,750 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Location1400BroadwayMember |  |  |
Total | 100,750 us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Location1400BroadwayMember |  |  |
Accumulated Depreciation | (3,396)us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Location1400BroadwayMember |  |  |
1333 Broadway, New York, NY [Member] | Office/Retail [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 75,330 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Location1333BroadwayAssociatesMember |  |  |
Initial Cost to the Company |  |  |  |
Land | 91,435 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Location1333BroadwayAssociatesMember |  |  |
Building & Improvements | 120,190 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Location1333BroadwayAssociatesMember |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 2,582 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Location1333BroadwayAssociatesMember |  |  |
Gross Amount at which Carried |  |  |  |
Land | 91,435 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Location1333BroadwayAssociatesMember |  |  |
Buildings & Improvements | 122,772 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Location1333BroadwayAssociatesMember |  |  |
Total | 214,207 us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Location1333BroadwayAssociatesMember |  |  |
Accumulated Depreciation | (5,243)us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Location1333BroadwayAssociatesMember |  |  |
1350 Broadway, New York, NY [Member] | Office/Retail [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 41,831 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Location1350BroadwayAssociatesMember |  |  |
Initial Cost to the Company |  |  |  |
Land | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Location1350BroadwayAssociatesMember |  |  |
Building & Improvements | 102,518 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Location1350BroadwayAssociatesMember |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 5,526 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Location1350BroadwayAssociatesMember |  |  |
Gross Amount at which Carried |  |  |  |
Land | 0 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Location1350BroadwayAssociatesMember |  |  |
Buildings & Improvements | 108,044 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Location1350BroadwayAssociatesMember |  |  |
Total | 108,044 us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Location1350BroadwayAssociatesMember |  |  |
Accumulated Depreciation | (4,974)us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Location1350BroadwayAssociatesMember |  |  |
250 West 57th Street, New York, NY [Member] | Office/Retail [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property250West57thStreetNewYorkNYMember |  |  |
Initial Cost to the Company |  |  |  |
Land | 2,117 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property250West57thStreetNewYorkNYMember |  |  |
Building & Improvements | 5,041 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property250West57thStreetNewYorkNYMember |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 71,959 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property250West57thStreetNewYorkNYMember |  |  |
Gross Amount at which Carried |  |  |  |
Land | 2,117 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property250West57thStreetNewYorkNYMember |  |  |
Buildings & Improvements | 77,000 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property250West57thStreetNewYorkNYMember |  |  |
Total | 79,117 us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property250West57thStreetNewYorkNYMember |  |  |
Accumulated Depreciation | (23,125)us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property250West57thStreetNewYorkNYMember |  |  |
501 Seventh Avenue, New York, NY [Member] | Office/Retail [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property501SeventhAvenueNewYorkNYMember |  |  |
Initial Cost to the Company |  |  |  |
Land | 1,100 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property501SeventhAvenueNewYorkNYMember |  |  |
Building & Improvements | 2,600 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property501SeventhAvenueNewYorkNYMember |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 87,992 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property501SeventhAvenueNewYorkNYMember |  |  |
Gross Amount at which Carried |  |  |  |
Land | 1,100 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property501SeventhAvenueNewYorkNYMember |  |  |
Buildings & Improvements | 90,592 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property501SeventhAvenueNewYorkNYMember |  |  |
Total | 91,692 us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property501SeventhAvenueNewYorkNYMember |  |  |
Accumulated Depreciation | (30,127)us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property501SeventhAvenueNewYorkNYMember |  |  |
1359 Broadway, New York, NY [Member] | Office/Retail [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 44,146 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property1359BroadwayNewYorkNYMember |  |  |
Initial Cost to the Company |  |  |  |
Land | 1,233 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property1359BroadwayNewYorkNYMember |  |  |
Building & Improvements | 1,809 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property1359BroadwayNewYorkNYMember |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 45,398 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property1359BroadwayNewYorkNYMember |  |  |
Gross Amount at which Carried |  |  |  |
Land | 1,233 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property1359BroadwayNewYorkNYMember |  |  |
Buildings & Improvements | 47,207 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property1359BroadwayNewYorkNYMember |  |  |
Total | 48,440 us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property1359BroadwayNewYorkNYMember |  |  |
Accumulated Depreciation | (17,187)us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property1359BroadwayNewYorkNYMember |  |  |
350 Fifth Avenue (Empire State Building), New York, NY [Member] | Office/Retail [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property350FifthAvenueEmpireStateBuildingNewYorkNYMember |  |  |
Initial Cost to the Company |  |  |  |
Land | 21,551 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property350FifthAvenueEmpireStateBuildingNewYorkNYMember |  |  |
Building & Improvements | 38,934 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property350FifthAvenueEmpireStateBuildingNewYorkNYMember |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 539,630 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property350FifthAvenueEmpireStateBuildingNewYorkNYMember |  |  |
Gross Amount at which Carried |  |  |  |
Land | 21,551 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property350FifthAvenueEmpireStateBuildingNewYorkNYMember |  |  |
Buildings & Improvements | 578,564 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property350FifthAvenueEmpireStateBuildingNewYorkNYMember |  |  |
Total | 600,115 us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property350FifthAvenueEmpireStateBuildingNewYorkNYMember |  |  |
Accumulated Depreciation | (71,225)us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property350FifthAvenueEmpireStateBuildingNewYorkNYMember |  |  |
One Grand Central Place, New York, NY [Member] | Office/Retail [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 91,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_PropertyOneGrandCentralPlaceNewYorkNYMember |  |  |
Initial Cost to the Company |  |  |  |
Land | 7,240 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_PropertyOneGrandCentralPlaceNewYorkNYMember |  |  |
Building & Improvements | 17,490 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_PropertyOneGrandCentralPlaceNewYorkNYMember |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 161,039 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_PropertyOneGrandCentralPlaceNewYorkNYMember |  |  |
Gross Amount at which Carried |  |  |  |
Land | 7,222 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_PropertyOneGrandCentralPlaceNewYorkNYMember |  |  |
Buildings & Improvements | 178,546 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_PropertyOneGrandCentralPlaceNewYorkNYMember |  |  |
Total | 185,768 us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_PropertyOneGrandCentralPlaceNewYorkNYMember |  |  |
Accumulated Depreciation | (66,999)us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_OfficeRetailMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_PropertyOneGrandCentralPlaceNewYorkNYMember |  |  |
First Stamford Place, Stamford, CT [Member] | Office Building [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 242,294 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_PropertyFirstStamfordPlaceStamfordCTMember |  |  |
Initial Cost to the Company |  |  |  |
Land | 22,952 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_PropertyFirstStamfordPlaceStamfordCTMember |  |  |
Building & Improvements | 122,739 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_PropertyFirstStamfordPlaceStamfordCTMember |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 40,321 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_PropertyFirstStamfordPlaceStamfordCTMember |  |  |
Gross Amount at which Carried |  |  |  |
Land | 24,861 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_PropertyFirstStamfordPlaceStamfordCTMember |  |  |
Buildings & Improvements | 161,150 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_PropertyFirstStamfordPlaceStamfordCTMember |  |  |
Total | 186,011 us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_PropertyFirstStamfordPlaceStamfordCTMember |  |  |
Accumulated Depreciation | (58,595)us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_PropertyFirstStamfordPlaceStamfordCTMember |  |  |
One Station Place, Stamford, CT (Metro Center) [Member] | Office Building [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 99,845 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_PropertyOneStationPlaceStamfordCTMetroCenterMember |  |  |
Initial Cost to the Company |  |  |  |
Land | 5,313 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_PropertyOneStationPlaceStamfordCTMetroCenterMember |  |  |
Building & Improvements | 28,602 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_PropertyOneStationPlaceStamfordCTMetroCenterMember |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 10,067 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_PropertyOneStationPlaceStamfordCTMetroCenterMember |  |  |
Gross Amount at which Carried |  |  |  |
Land | 5,313 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_PropertyOneStationPlaceStamfordCTMetroCenterMember |  |  |
Buildings & Improvements | 38,669 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_PropertyOneStationPlaceStamfordCTMetroCenterMember |  |  |
Total | 43,982 us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_PropertyOneStationPlaceStamfordCTMetroCenterMember |  |  |
Accumulated Depreciation | (24,443)us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_PropertyOneStationPlaceStamfordCTMetroCenterMember |  |  |
383 Main Avenue, Norwalk, CT [Member] | Office Building [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 29,852 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property383MainAvenueNorwalkCTMember |  |  |
Initial Cost to the Company |  |  |  |
Land | 2,262 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property383MainAvenueNorwalkCTMember |  |  |
Building & Improvements | 12,820 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property383MainAvenueNorwalkCTMember |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 11,145 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property383MainAvenueNorwalkCTMember |  |  |
Gross Amount at which Carried |  |  |  |
Land | 2,262 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property383MainAvenueNorwalkCTMember |  |  |
Buildings & Improvements | 23,965 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property383MainAvenueNorwalkCTMember |  |  |
Total | 26,227 us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property383MainAvenueNorwalkCTMember |  |  |
Accumulated Depreciation | (9,125)us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property383MainAvenueNorwalkCTMember |  |  |
500 Mamaroneck Avenue, Harrison, NY [Member] | Office Building [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property500MamaroneckAvenueHarrisonNYMember |  |  |
Initial Cost to the Company |  |  |  |
Land | 4,571 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property500MamaroneckAvenueHarrisonNYMember |  |  |
Building & Improvements | 25,915 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property500MamaroneckAvenueHarrisonNYMember |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 16,011 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property500MamaroneckAvenueHarrisonNYMember |  |  |
Gross Amount at which Carried |  |  |  |
Land | 4,571 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property500MamaroneckAvenueHarrisonNYMember |  |  |
Buildings & Improvements | 41,925 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property500MamaroneckAvenueHarrisonNYMember |  |  |
Total | 46,496 us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property500MamaroneckAvenueHarrisonNYMember |  |  |
Accumulated Depreciation | (17,328)us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property500MamaroneckAvenueHarrisonNYMember |  |  |
10 Bank Street, White Plains, NY [Member] | Office Building [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 32,847 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property10BankStreetWhitePlainsNYMember |  |  |
Initial Cost to the Company |  |  |  |
Land | 5,612 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property10BankStreetWhitePlainsNYMember |  |  |
Building & Improvements | 31,803 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property10BankStreetWhitePlainsNYMember |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 10,813 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property10BankStreetWhitePlainsNYMember |  |  |
Gross Amount at which Carried |  |  |  |
Land | 5,612 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property10BankStreetWhitePlainsNYMember |  |  |
Buildings & Improvements | 42,616 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property10BankStreetWhitePlainsNYMember |  |  |
Total | 48,228 us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property10BankStreetWhitePlainsNYMember |  |  |
Accumulated Depreciation | (16,032)us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property10BankStreetWhitePlainsNYMember |  |  |
10 Union Square, New York, NY [Member] | Retail Site [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 20,641 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property10UnionSquareNewYorkNYMember |  |  |
Initial Cost to the Company |  |  |  |
Land | 5,003 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property10UnionSquareNewYorkNYMember |  |  |
Building & Improvements | 12,866 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property10UnionSquareNewYorkNYMember |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 1,535 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property10UnionSquareNewYorkNYMember |  |  |
Gross Amount at which Carried |  |  |  |
Land | 5,003 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property10UnionSquareNewYorkNYMember |  |  |
Buildings & Improvements | 14,401 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property10UnionSquareNewYorkNYMember |  |  |
Total | 19,404 us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property10UnionSquareNewYorkNYMember |  |  |
Accumulated Depreciation | (6,162)us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property10UnionSquareNewYorkNYMember |  |  |
1542 Third Avenue, New York, NY [Member] | Retail Site [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 18,628 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property1542ThirdAvenueNewYorkNYMember |  |  |
Initial Cost to the Company |  |  |  |
Land | 2,239 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property1542ThirdAvenueNewYorkNYMember |  |  |
Building & Improvements | 15,266 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property1542ThirdAvenueNewYorkNYMember |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 382 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property1542ThirdAvenueNewYorkNYMember |  |  |
Gross Amount at which Carried |  |  |  |
Land | 2,239 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property1542ThirdAvenueNewYorkNYMember |  |  |
Buildings & Improvements | 15,648 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property1542ThirdAvenueNewYorkNYMember |  |  |
Total | 17,887 us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property1542ThirdAvenueNewYorkNYMember |  |  |
Accumulated Depreciation | (6,079)us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property1542ThirdAvenueNewYorkNYMember |  |  |
1010 Third Avenue, New York, NY and 77 West 55th Street, New York, NY [Member] | Retail Site [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 27,595 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property1010ThirdAvenueNewYorkNYand77West55thStreetNewYorkNYMember |  |  |
Initial Cost to the Company |  |  |  |
Land | 4,462 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property1010ThirdAvenueNewYorkNYand77West55thStreetNewYorkNYMember |  |  |
Building & Improvements | 15,817 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property1010ThirdAvenueNewYorkNYand77West55thStreetNewYorkNYMember |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 774 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property1010ThirdAvenueNewYorkNYand77West55thStreetNewYorkNYMember |  |  |
Gross Amount at which Carried |  |  |  |
Land | 4,462 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property1010ThirdAvenueNewYorkNYand77West55thStreetNewYorkNYMember |  |  |
Buildings & Improvements | 16,593 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property1010ThirdAvenueNewYorkNYand77West55thStreetNewYorkNYMember |  |  |
Total | 21,055 us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property1010ThirdAvenueNewYorkNYand77West55thStreetNewYorkNYMember |  |  |
Accumulated Depreciation | (6,889)us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property1010ThirdAvenueNewYorkNYand77West55thStreetNewYorkNYMember |  |  |
69-97 Main Street, Westport, CT [Member] | Retail Site [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property6997MainStreetWestportCTMember |  |  |
Initial Cost to the Company |  |  |  |
Land | 2,782 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property6997MainStreetWestportCTMember |  |  |
Building & Improvements | 15,766 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property6997MainStreetWestportCTMember |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 918 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property6997MainStreetWestportCTMember |  |  |
Gross Amount at which Carried |  |  |  |
Land | 2,782 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property6997MainStreetWestportCTMember |  |  |
Buildings & Improvements | 16,684 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property6997MainStreetWestportCTMember |  |  |
Total | 19,466 us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property6997MainStreetWestportCTMember |  |  |
Accumulated Depreciation | (5,034)us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property6997MainStreetWestportCTMember |  |  |
103-107 Main Street, Westport, CT [Member] | Retail Site [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property103107MainStreetWestportCTMember |  |  |
Initial Cost to the Company |  |  |  |
Land | 1,243 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property103107MainStreetWestportCTMember |  |  |
Building & Improvements | 7,043 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property103107MainStreetWestportCTMember |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 131 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property103107MainStreetWestportCTMember |  |  |
Gross Amount at which Carried |  |  |  |
Land | 1,260 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property103107MainStreetWestportCTMember |  |  |
Buildings & Improvements | 7,157 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property103107MainStreetWestportCTMember |  |  |
Total | 8,417 us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property103107MainStreetWestportCTMember |  |  |
Accumulated Depreciation | (1,497)us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_Property103107MainStreetWestportCTMember |  |  |
Transportation Hub, Stamford, CT [Member] | Land [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_LandPropertyMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_TransportationHubStamfordCTMember |  |  |
Initial Cost to the Company |  |  |  |
Land | 4,542 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_LandPropertyMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_TransportationHubStamfordCTMember |  |  |
Building & Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_LandPropertyMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_TransportationHubStamfordCTMember |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 6,986 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_LandPropertyMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_TransportationHubStamfordCTMember |  |  |
Gross Amount at which Carried |  |  |  |
Land | 4,542 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_LandPropertyMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_TransportationHubStamfordCTMember |  |  |
Buildings & Improvements | 6,986 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_LandPropertyMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_TransportationHubStamfordCTMember |  |  |
Total | 11,528 us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_LandPropertyMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_TransportationHubStamfordCTMember |  |  |
Accumulated Depreciation | $ 0 us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_LandPropertyMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_TransportationHubStamfordCTMember |  |  |

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