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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Tenant and other receivables allowance | $ 2,401 | $ 1,427
Deferred rent receivables allowance | $ 147 | $ 420
ESRT General Partner Operating Partnership Units Outstanding | 114,253,886 |
Limited partner operating partnership units, outstanding | 153,332,538 |
Private perpetual preferred unit liquidation preference (USD per share) | $ 16.62 | $ 16.62
Private perpetual preferred units - issued | 1,560,360 | 1,560,360
Private perpetual preferred units - outstanding | 1,560,360 | 1,560,360
Series PR operating partnership units |  |
Limited partner operating partnership units, outstanding | 97,623,399 | 100,210,874
Series ES operating partnership units |  |
Limited partner operating partnership units, outstanding | 39,697,457 | 42,365,408
Series 60 operating partnership units |  |
Limited partner operating partnership units, outstanding | 10,678,386 | 11,456,448
Series 250 operating partnership units |  |
Limited partner operating partnership units, outstanding | 5,333,296 | 5,789,717
ESRT | Series PR operating partnership units |  |
ESRT General Partner Operating Partnership Units Outstanding | 2,675,864 | 2,671,043
Limited partner operating partnership units, outstanding | 111,578,022 | 104,520,844

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