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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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