XML 30 R73.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Related Party Transactions Excluded Properties and Businesses (Details) | Dec. 31, 2014 office_and_property
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Retail Site [Member] | Manhattan [Member] |
Related Party Transaction [Line Items] |
Number of properties | 4 us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_StatementGeographicalAxis = esrt_ManhattanMember
Office Building [Member] |
Related Party Transaction [Line Items] |
Number of properties | 14 us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember
Office Building [Member] | Manhattan [Member] |
Related Party Transaction [Line Items] |
Number of properties | 9 us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_StatementGeographicalAxis = esrt_ManhattanMember
Malkin Group [Member] | Mezzanine and Senior Equity Funds [Member] |
Related Party Transaction [Line Items] |
Number of interests owned | 6 esrt_NumberofInterestsOwned / us-gaap_InvestmentTypeAxis = esrt_MezzanineandSeniorEquityFundsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = esrt_MalkinGroupMember
Malkin Group [Member] | Industrial Funds [Member] |
Related Party Transaction [Line Items] |
Number of interests owned | 3 esrt_NumberofInterestsOwned / us-gaap_InvestmentTypeAxis = esrt_IndustrialFundsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = esrt_MalkinGroupMember
Malkin Group [Member] | Residential Property Manager [Member] |
Related Party Transaction [Line Items] |
Number of properties | 5 us-gaap_NumberOfRealEstateProperties / us-gaap_InvestmentTypeAxis = esrt_ResidentialPropertyManagerMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = esrt_MalkinGroupMember
Number of interests owned | 5 esrt_NumberofInterestsOwned / us-gaap_InvestmentTypeAxis = esrt_ResidentialPropertyManagerMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = esrt_MalkinGroupMember
Malkin Group [Member] | Multi-family Property [Member] | Greenwich, Connecticut [Member] |
Related Party Transaction [Line Items] |
Number of properties | 5 us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_MultifamilyPropertyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = esrt_MalkinGroupMember / us-gaap_StatementGeographicalAxis = esrt_GreenwichConnecticutMember
Malkin Group [Member] | Retail Site [Member] | Greenwich, Connecticut [Member] |
Related Party Transaction [Line Items] |
Number of properties | 3 us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = esrt_MalkinGroupMember / us-gaap_StatementGeographicalAxis = esrt_GreenwichConnecticutMember
Malkin Group [Member] | Retail Site [Member] | Manhattan [Member] |
Related Party Transaction [Line Items] |
Number of properties | 2 us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = esrt_MalkinGroupMember / us-gaap_StatementGeographicalAxis = esrt_ManhattanMember
Malkin Group [Member] | Former Post Office [Member] | Greenwich, Connecticut [Member] |
Related Party Transaction [Line Items] |
Number of properties | 1 us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_FormerPostOfficeMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = esrt_MalkinGroupMember / us-gaap_StatementGeographicalAxis = esrt_GreenwichConnecticutMember
Malkin Group [Member] | Office Building [Member] | Manhattan [Member] |
Related Party Transaction [Line Items] |
Number of properties | 1 us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = esrt_MalkinGroupMember / us-gaap_StatementGeographicalAxis = esrt_ManhattanMember

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- Definition Number of Interests Owned + References No definition available. + Details
Name: | esrt_NumberofInterestsOwned
Namespace Prefix: | esrt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_OfficeBuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_RetailSiteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=esrt_MalkinGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |