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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Tenant and other receivables allowance	$ 1,082	$ 499
Deferred rent receivables allowance	$ 262	$ 216
ESRT General Partner Operating Partnership Units Outstanding	95,607,990
Limited partner operating partnership units, outstanding	150,356,053
Series PR Operating Partnership Units [Member]
Limited partner operating partnership units, outstanding	85,073,470	84,588,270
Series ES Operating Partnership Units [Member]
Limited partner operating partnership units, outstanding	46,134,135	46,134,135
Series 60 Operating Partnership Units [Member]
Limited partner operating partnership units, outstanding	12,570,434	12,570,434
Series 250 Operating Partnership Units [Member]
Limited partner operating partnership units, outstanding	6,578,014	6,578,014
ESRT [Member] | Series PR Operating Partnership Units [Member]
ESRT General Partner Operating Partnership Units Outstanding	2,459,640	2,454,770
Limited partner operating partnership units, outstanding	93,148,350	93,151,383

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Allowance for Deferred Rent Receivables

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- Definition

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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The number of limited partner units outstanding.

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