Segment Information - Summary of NOI by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Property rental revenue	$ 118,680	$ 123,963	$ 354,519	$ 365,702
Other property revenue	3,076	6,331	10,267	19,475
Total rental revenue	121,756	130,294	364,786	385,177
Property operating	37,572	35,800	105,867	100,087
Real estate taxes	17,354	16,740	53,422	52,241
Total property expense	54,926	52,540	159,289	152,328
Consolidated NOI	66,830	77,754	205,497	232,849
Operating Segments | Commercial Segment
Segment Reporting Information [Line Items]
Property rental revenue	90,050	94,678	266,823	285,551
Other property revenue	3,002	6,237	10,018	19,212
Total rental revenue	93,052	100,915	276,841	304,763
Property operating	26,701	27,200	78,645	84,089
Real estate taxes	12,136	12,004	36,532	37,257
Total property expense	38,837	39,204	115,177	121,346
Consolidated NOI	54,215	61,711	161,664	183,417
Operating Segments | Multifamily
Segment Reporting Information [Line Items]
Property rental revenue	30,452	28,946	94,873	86,069
Other property revenue	74	94	249	263
Total rental revenue	30,526	29,040	95,122	86,332
Property operating	13,226	9,490	34,238	25,662
Real estate taxes	4,656	3,552	14,088	11,243
Total property expense	17,882	13,042	48,326	36,905
Consolidated NOI	12,644	15,998	46,796	49,427
Other
Segment Reporting Information [Line Items]
Property rental revenue	(1,822)	339	(7,177)	(5,918)
Total rental revenue	(1,822)	339	(7,177)	(5,918)
Property operating	(2,355)	(890)	(7,016)	(9,664)
Real estate taxes	562	1,184	2,802	3,741
Total property expense	(1,793)	294	(4,214)	(5,923)
Consolidated NOI	$ (29)	$ 45	$ (2,963)	$ 5