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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Tenant and other receivables allowance | $ 488 | $ 1,422
Deferred rent receivables allowance | $ 19 | $ 185
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) | 174,900,000 |
Limited partner operating partnership units, outstanding (in shares) | 128,400,000 |
Series PR Operating Partnership Units |  |
Limited partner operating partnership units, outstanding (in shares) | 86,202,638 | 91,759,741
Series ES Operating Partnership Units Limited Partners |  |
Limited partner operating partnership units, outstanding (in shares) | 30,129,556 | 33,774,678
Series 60 Operating Partnership Units [Member] |  |
Limited partner operating partnership units, outstanding (in shares) | 8,019,509 | 8,987,931
Series 250 Operating Partnership Units Limited Partners |  |
Limited partner operating partnership units, outstanding (in shares) | 4,063,737 | 4,410,093
ESRT | Series PR Operating Partnership Units |  |
General partner operating partnership units, outstanding (in shares) | 3,033,261 | 3,004,095
Limited partner operating partnership units, outstanding (in shares) | 171,877,365 | 158,472,949

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