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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Tenant and other receivables allowance | $ 1,422 | $ 3,333
Deferred rent receivables allowance | $ 185 | $ 390
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) | 161,500,000 |
Limited partner operating partnership units, outstanding (in shares) | 138,900,000 |
Series PR Operating Partnership Units [Member] |  |
Limited partner operating partnership units, outstanding (in shares) | 91,759,741 | 93,075,441
Series ES Operating Partnership Units [Member] |  |
Limited partner operating partnership units, outstanding (in shares) | 33,774,678 | 35,729,094
Series 60 Operating Partnership Units [Member] |  |
Limited partner operating partnership units, outstanding (in shares) | 8,987,931 | 9,701,402
Series 250 Operating Partnership Units [Member] |  |
Limited partner operating partnership units, outstanding (in shares) | 4,410,093 | 4,746,661
ESRT [Member] | Series PR Operating Partnership Units [Member] |  |
General partner operating partnership units, outstanding (in shares) | 3,004,095 | 2,990,931
Limited partner operating partnership units, outstanding (in shares) | 158,472,949 | 152,849,546

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