Segments - Net Income of Reportable Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information
Rental revenues	$ 192,140	$ 166,488	$ 151,339
Real estate taxes	21,852	18,136	14,961
Segment revenues	91,936	217,146	105,859
Net operating income	127,630	117,066	106,367
Office real estate
Segment Reporting Information
Rental revenues	47,363	43,494	33,269
Rental expenses	12,412	10,799	8,722
Real estate taxes	6,112	5,111	3,471
Net operating income	28,839	27,584	21,076
Retail real estate
Segment Reporting Information
Rental revenues	78,572	73,032	77,593
Rental expenses	12,512	11,029	11,656
Real estate taxes	8,416	7,784	7,916
Net operating income	57,644	54,219	58,021
Multifamily residential real estate
Segment Reporting Information
Rental revenues	66,205	49,962	40,477
Rental expenses	21,570	17,132	13,954
Real estate taxes	7,324	5,241	3,574
Net operating income	37,311	27,589	22,949
General contracting and real estate services
Segment Reporting Information
Net operating income	3,836	7,674	4,321
General contracting and real estate services revenues | General contracting and real estate services
Segment Reporting Information
Segment revenues	91,936	217,146	105,859
Segment expenses	$ 88,100	$ 209,472	$ 101,538