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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Tenant and other receivables allowance | $ 3,333 | $ 2,792
Deferred rent receivables allowance | $ 390 | $ 245
Private perpetual preferred units, liquidation preference per share (in dollars per share) | $ 16.62 | $ 16.62
Private perpetual preferred units, issued (in shares) | 1,560,360 | 1,560,360
Private perpetual preferred units, outstanding (in shares) | 1,560,360 | 1,560,360
General partner operating partnership units, outstanding (in shares) | 155,800,000 |
Limited partner operating partnership units, outstanding (in shares) | 143,300,000 |
Series PR Operating Partnership Units [Member] |  |
Limited partner operating partnership units, outstanding (in shares) | 93,075,441 | 93,863,451
Series ES Operating Partnership Units [Member] |  |
Limited partner operating partnership units, outstanding (in shares) | 35,729,094 | 38,262,650
Series 60 Operating Partnership Units [Member] |  |
Limited partner operating partnership units, outstanding (in shares) | 9,701,402 | 10,318,492
Series 250 Operating Partnership Units [Member] |  |
Limited partner operating partnership units, outstanding (in shares) | 4,746,661 | 5,106,039
ESRT [Member] | Series PR Operating Partnership Units [Member] |  |
General partner operating partnership units, outstanding (in shares) | 2,990,931 | 2,675,740
Limited partner operating partnership units, outstanding (in shares) | 152,849,546 | 117,347,639

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