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Operating Segments - Profit by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 10,494	$ 11,937	$ 33,425	$ 39,808
Total profit from segments	(5,168)	(2,303)	(16,941)	(4,050)
Operating segments
Segment Reporting Information [Line Items]
Total profit from segments	4,018	5,066	13,683	15,954
Operating segments | Multifamily Segment
Segment Reporting Information [Line Items]
Revenues	3,703	3,685	11,068	10,943
Operating expenses	(2,072)	(2,413)	(6,306)	(6,466)
Profit from segment	1,631	1,272	4,762	4,477
Operating segments | Commercial Segment
Segment Reporting Information [Line Items]
Revenues	5,925	7,769	19,115	23,518
Operating expenses	(3,538)	(3,975)	(10,194)	(12,041)
Profit from segment	$ 2,387	$ 3,794	$ 8,921	$ 11,477

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