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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Tenant and other receivables allowance	$ 488	$ 1,422
Deferred rent receivables allowance	$ 19	$ 185
Private perpetual preferred units, liquidation preference per share (in dollars 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)	174,900,000
Limited partner operating partnership units, outstanding (in shares)	128,400,000
Series PR Operating Partnership Units
Limited partner operating partnership units, outstanding (in shares)	86,202,638	91,759,741
Series ES Operating Partnership Units Limited Partners
Limited partner operating partnership units, outstanding (in shares)	30,129,556	33,774,678
Series 60 Operating Partnership Units [Member]
Limited partner operating partnership units, outstanding (in shares)	8,019,509	8,987,931
Series 250 Operating Partnership Units Limited Partners
Limited partner operating partnership units, outstanding (in shares)	4,063,737	4,410,093
ESRT | Series PR Operating Partnership Units
General partner operating partnership units, outstanding (in shares)	3,033,261	3,004,095
Limited partner operating partnership units, outstanding (in shares)	171,877,365	158,472,949

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