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Segments - Net Income of Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information
Rental revenues	$ 41,832	$ 42,220	$ 36,378	$ 30,909	$ 30,731	$ 28,930	$ 28,598	$ 28,699	$ 151,339	$ 116,958	$ 108,737
Rental expenses									34,332
Rental expenses										27,222	25,422
Real estate taxes									14,961	11,383	10,528
Segment expenses									101,538	73,628	186,590
Net operating income	28,869	29,359	26,333	21,806	21,114	19,964	19,908	20,098
Operating Segments
Segment Reporting Information
Net operating income									106,367	81,084	80,231
Operating Segments \| Office real estate
Segment Reporting Information
Rental revenues									33,269	20,701	19,207
Rental expenses									8,722
Rental expenses										5,858	5,483
Real estate taxes									3,471	2,034	1,859
Net operating income									21,076	12,809	11,865
Operating Segments \| Retail real estate
Segment Reporting Information
Rental revenues									77,593	67,959	63,109
Rental expenses									11,656
Rental expenses										10,903	10,234
Real estate taxes									7,916	6,801	6,175
Net operating income									58,021	50,255	46,700
Operating Segments \| Multifamily residential real estate
Segment Reporting Information
Rental revenues									40,477	28,298	26,421
Rental expenses									13,954
Rental expenses										10,461	9,705
Real estate taxes									3,574	2,548	2,494
Net operating income									22,949	15,289	14,222
Operating Segments \| General contracting and real estate services
Segment Reporting Information
Net operating income									4,321	2,731	7,444
General contracting and real estate services revenues
Segment Reporting Information
Segment revenues	$ 39,741	$ 27,638	$ 21,444	$ 17,036	$ 12,705	$ 19,950	$ 20,654	$ 23,050	105,859	76,359	194,034
General contracting and real estate services revenues \| Operating Segments \| General contracting and real estate services
Segment Reporting Information
Segment revenues									105,859	76,359	194,034
Segment expenses									$ 101,538	$ 73,628	$ 186,590