CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
REVENUE
Rental income	$ 31,146,000	$ 33,110,000
Management and other fee income	$ 135,000	$ 207,000
Type of Revenue [Extensible List]	Management and Other Fee Income [Member]	Management and Other Fee Income [Member]
Total revenue	$ 31,281,000	$ 33,317,000
EXPENSES
Property operating	10,643,000	10,301,000
Real estate taxes	10,155,000	9,225,000
Depreciation and amortization	13,142,000	34,097,000
General and administrative	11,232,000	9,420,000
Total expenses	45,172,000	63,043,000
Gain on sale of real estate, net	24,208,000	20,788,000
Impairment of real estate assets	(1,700,000)	0
Equity in loss of unconsolidated entities	(1,162,000)	(894,000)
Interest and other income	7,624,000	333,000
Interest expense	(26,150,000)	(21,513,000)
Loss before taxes	(11,071,000)	(31,012,000)
Benefit for taxes	138,000	37,000
Net loss	(10,933,000)	(30,975,000)
Net loss attributable to non-controlling interests	3,213,000	10,311,000
Net loss attributable to Seritage	(7,720,000)	(20,664,000)
Preferred dividends	(1,225,000)	(1,225,000)
Net loss attributable to Seritage common shareholders	$ (8,945,000)	$ (21,889,000)
Net loss per share attributable to Seritage Class A and Class C common shareholders - Basic	$ (0.23)	$ (0.59)
Net loss per share attributable to Seritage Class A and Class C common shareholders - Diluted	$ (0.23)	$ (0.59)
Weighted average Class A and Class C common shares outstanding - Basic	39,477	37,232
Weighted average Class A and Class C common shares outstanding - Diluted	39,477	37,232