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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Tenant and other receivables allowance |  | $ 488
Deferred rent receivables allowance |  | $ 19
General partner operating partnership units, outstanding (in shares) | 181,900,000 |
Limited partner operating partnership units, outstanding (in shares) | 117,800,000 |
Private Perpetual Preferred Units, Series 2019 |  |
Private perpetual preferred units, liquidation preference per share (in dollars per share) | $ 13.52 |
Private perpetual preferred units, issued (in shares) | 4,610,383 |
Private perpetual preferred units, outstanding (in shares) | 4,610,383 |
Private Perpetual Preferred Units, Series 2014 |  |
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
Series PR Operating Partnership Units |  |
Limited partner operating partnership units, outstanding (in shares) | 81,387,763 | 86,202,638
Series ES Operating Partnership Units Limited Partners |  |
Limited partner operating partnership units, outstanding (in shares) | 25,809,604 | 30,129,556
Series 60 Operating Partnership Units Limited Partners |  |
Limited partner operating partnership units, outstanding (in shares) | 7,025,089 | 8,019,509
Series 250 Operating Partnership Units Limited Partners |  |
Limited partner operating partnership units, outstanding (in shares) | 3,535,197 | 4,063,737
ESRT | Series PR Operating Partnership Units |  |
General partner operating partnership units, outstanding (in shares) | 2,996,520 | 3,033,261
Limited partner operating partnership units, outstanding (in shares) | 178,897,876 | 171,877,365

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