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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Tenant and other receivables allowance | $ 4,242 | $ 2,792
Deferred rent receivables allowance | $ 228 | $ 245
Private perpetual preferred unit 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) | 154,925,644 |
Limited partner operating partnership units, outstanding (in shares) | 144,173,889 |
Series PR operating partnership units |  |
Limited partner operating partnership units, outstanding (in shares) | 93,507,101 | 93,863,451
Series ES operating partnership units |  |
Limited partner operating partnership units, outstanding (in shares) | 36,061,948 | 38,262,650
Series 60 operating partnership units |  |
Limited partner operating partnership units, outstanding (in shares) | 9,794,230 | 10,318,492
Series 250 operating partnership units |  |
Limited partner operating partnership units, outstanding (in shares) | 4,810,610 | 5,106,039
ESRT | Series PR operating partnership units |  |
General partner operating partnership units outstanding (in shares) | 2,990,995 | 2,675,740
Limited partner operating partnership units, outstanding (in shares) | 151,934,649 | 117,347,639

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