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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets
Tenant and other receivables allowance	$ 1,616	$ 1,422
Deferred rent receivables allowance	$ 22	$ 185
Capital
Private perpetual preferred units, 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)	169,220,903
Limited partner operating partnership units, outstanding (in shares)	134,112,696
Series PR operating partnership units
Capital
Limited partner operating partnership units, outstanding (in shares)	90,799,640	91,759,741
Series ES operating partnership units
Capital
Limited partner operating partnership units, outstanding (in shares)	30,910,322	33,774,678
Series 60 operating partnership units
Capital
Limited partner operating partnership units, outstanding (in shares)	8,244,466	8,987,931
Series 250 operating partnership units
Capital
Limited partner operating partnership units, outstanding (in shares)	4,158,268	4,410,093
ESRT | Series PR operating partnership units
Capital
General partner operating partnership units, outstanding (in shares)	3,033,336	3,004,095
Limited partner operating partnership units, outstanding (in shares)	166,187,567	158,472,949

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