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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Tenant and other receivables allowance	$ 2,742	$ 1,427
Deferred rent receivables allowance	$ 99	$ 420
General partner operating partnership units outstanding	117,954,034
Limited partner operating partnership units, outstanding	149,625,374
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	94,837,920	100,210,874
Series ES operating partnership units
Limited partner operating partnership units, outstanding	38,991,485	42,365,408
Series 60 operating partnership units
Limited partner operating partnership units, outstanding	10,557,368	11,456,448
Series 250 operating partnership units
Limited partner operating partnership units, outstanding	5,238,601	5,789,717
ESRT | Series PR operating partnership units
General partner operating partnership units outstanding	2,675,794	2,671,043
Limited partner operating partnership units, outstanding	115,278,240	104,520,844

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