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Document and Entity Information Document	3 Months Ended
	Mar. 31, 2015	Apr. 28, 2015
Entity Registrant Name	Empire State Realty OP, L.P.
Entity Central Index Key	0001553079
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Document Period End Date	Mar. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Entity Filer Category	Non-accelerated Filer
Series ES operating partnership units
Entity Common Stock, Shares Outstanding		40,365,762dei_EntityCommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = esrt_SeriesESOperatingPartnershipUnitsMember
Series 60 operating partnership units
Entity Common Stock, Shares Outstanding		10,858,552dei_EntityCommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = esrt_Series60OperatingPartnershipUnitsMember
Series 250 operating partnership units
Entity Common Stock, Shares Outstanding		5,493,693dei_EntityCommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = esrt_Series250OperatingPartnershipUnitsMember

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