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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Tenant and other receivables allowance | $ 1,167 | $ 1,422
Deferred rent receivables allowance | $ 57 | $ 185
Capital |  |
Private perpetual preferred units, liquidation preference (in USD 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) | 167,704,632 |
Limited partner operating partnership units, outstanding (in shares) | 135,628,967 |
Series PR operating partnership units |  |
Capital |  |
Limited partner operating partnership units, outstanding (in shares) | 91,447,150 | 91,759,741
Series ES operating partnership units |  |
Capital |  |
Limited partner operating partnership units, outstanding (in shares) | 31,407,485 | 33,774,678
Series 60 operating partnership units |  |
Capital |  |
Limited partner operating partnership units, outstanding (in shares) | 8,544,711 | 8,987,931
Series 250 operating partnership units |  |
Capital |  |
Limited partner operating partnership units, outstanding (in shares) | 4,229,621 | 4,410,093
ESRT | Series PR operating partnership units |  |
Capital |  |
General partner operating partnership units, outstanding (in shares) | 3,033,336 | 3,004,095
Limited partner operating partnership units, outstanding (in shares) | 164,671,296 | 158,472,949

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