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Segments - Net Income of Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information
Rental revenues	$ 30,731	$ 28,930	$ 28,598	$ 28,699	$ 27,654	$ 27,096	$ 26,755	$ 27,232	$ 116,958	$ 108,737	$ 99,355
Rental expenses									27,222	25,422	21,904
Real estate taxes									11,383	10,528	9,629
Net operating income	21,114	19,964	19,908	20,098	19,211	19,397	20,645	20,978
Operating Segments
Segment Reporting Information
Net operating income									81,084	80,231	73,477
Operating Segments \| Office real estate
Segment Reporting Information
Rental revenues									20,701	19,207	20,929
Rental expenses									5,858	5,483	5,560
Real estate taxes									2,034	1,859	2,000
Net operating income									12,809	11,865	13,369
Operating Segments \| Retail real estate
Segment Reporting Information
Rental revenues									67,959	63,109	56,511
Rental expenses									10,903	10,234	9,116
Real estate taxes									6,801	6,175	5,395
Net operating income									50,255	46,700	42,000
Operating Segments \| Multifamily residential real estate
Segment Reporting Information
Rental revenues									28,298	26,421	21,915
Rental expenses									10,461	9,705	7,228
Real estate taxes									2,548	2,494	2,234
Net operating income									15,289	14,222	12,453
Operating Segments \| General contracting and real estate services
Segment Reporting Information
Net operating income									2,731	7,444	5,655
General contracting and real estate services revenues
Segment Reporting Information
Segment revenues	$ 12,705	$ 19,950	$ 20,654	$ 23,050	$ 32,643	$ 41,201	$ 56,671	$ 63,519	76,359	194,034	159,030
Segment expenses									73,628	186,590	153,375
General contracting and real estate services revenues \| Operating Segments \| General contracting and real estate services
Segment Reporting Information
Segment revenues									76,359	194,034	159,030
Segment expenses									$ 73,628	$ 186,590	$ 153,375