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Acquisitions Schedule of allocation of the purchase price for assets and liabilities acquired (Details) (USD $) In Thousands, unless otherwise specified | 0 Months Ended |  |
--- | --- | --- | ---
Jul. 15, 2014 | Oct. 06, 2013 | Dec. 31, 2014 | Dec. 31, 2013
Consideration paid: |  |  |  |
Total consideration paid | $ 733,600 us-gaap_BusinessCombinationConsiderationTransferred1 |  |  |
Net assets acquired: |  |  |  |
Building and improvements | 354,429 esrt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBuildingsandImprovements |  |  |
Acquired below-market ground lease | 334,178 esrt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAcquiredBelowMarketGroundLeases |  |  |
Acquired above-market leases | 13,088 esrt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAcquiredAboveMarketLeases |  |  |
Acquired in place lease value and deferred leasing costs | 88,374 esrt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAcquiredinPlaceLeaseValueandDeferredLeasingCosts |  |  |
Goodwill |  |  | 491,479 us-gaap_Goodwill | 491,479 us-gaap_Goodwill
Mortgage notes payable | (182,851)esrt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedLongtermDebt |  |  |
Acquired below-market leases | (36,553)esrt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAcquiredBelowMarketLeases |  |  |
Total net assets acquired | 565,916 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet |  |  |
Business Combination, Bargain Purchase [Abstract] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Liabilities, Net of Other Assets | (4,749)esrt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherLiabilitiesNetofOtherAssets |  |  |
Total Acquisitions [Member] |  |  |  |
Consideration paid: |  |  |  |
Cash and issuance of Class A Common Stock, Class B Common Stock, and OP units | 565,916 esrt_BusinessCombinationConsiderationTransferredCashandEquityInterestsIssuedandIssuable / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember | 1,047,487 esrt_BusinessCombinationConsiderationTransferredCashandEquityInterestsIssuedandIssuable / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember |  |
Debt assumed | 167,684 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember | 124,354 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember |  |
Total consideration paid |  | 1,171,841 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember |  |
Net assets acquired: |  |  |  |
Land |  | 91,435 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember |  |
Building and improvements |  | 516,344 esrt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedBuildingsandImprovements / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember |  |
Acquired below-market ground lease |  | 62,738 esrt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAcquiredBelowMarketGroundLeases / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember |  |
Acquired above-market leases |  | 72,123 esrt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAcquiredAboveMarketLeases / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember |  |
Acquired in place lease value and deferred leasing costs |  | 186,415 esrt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAcquiredinPlaceLeaseValueandDeferredLeasingCosts / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember |  |
Goodwill |  | 491,479 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember |  |
Other assets, net of other liabilities |  | 6,061 esrt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssetsNetofOtherLiabilities / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember |  |
Mortgage notes payable |  | (136,226)esrt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedLongtermDebt / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember |  |
Acquired below-market leases |  | (134,651)esrt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAcquiredBelowMarketLeases / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember |  |
Total net assets acquired |  | 1,155,718 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember |  |
Business Combination, Bargain Purchase [Abstract] |  |  |  |
Total |  | 108,231 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember |  |
Leasehold Positions [Member] |  |  |  |
Business Combination, Bargain Purchase [Abstract] |  |  |  |
Total |  | 35,147 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / us-gaap_BusinessAcquisitionAxis = esrt_LeaseholdPositionsMember |  |
1333 Broadway Associates [Member] |  |  |  |
Business Combination, Bargain Purchase [Abstract] |  |  |  |
Total |  | 40,962 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / us-gaap_BusinessAcquisitionAxis = esrt_Location1333BroadwayAssociatesMember |  |
1350 Broadway Associates [Member] |  |  |  |
Business Combination, Bargain Purchase [Abstract] |  |  |  |
Total |  | $ 32,122 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / us-gaap_BusinessAcquisitionAxis = esrt_Location1350BroadwayAssociatesMember |  |

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