Segments - Net Income of Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information
Rental revenues	$ 55,224	$ 47,378	$ 109,859	$ 93,119
Rental expenses	12,685	11,292	25,354	22,124
Real estate taxes	5,837	5,465	11,241	10,771
Segment revenues	45,273	18,408	69,923	53,971
Gross profit	38,557	30,898	75,948	61,789
General contracting and real estate services
Segment Reporting Information
Segment revenues	45,273	18,408	69,923	53,971
Segment expenses	43,418	18,131	67,239	52,406
Gross profit	1,855	277	2,684	1,565
Office real estate
Segment Reporting Information
Rental revenues	18,314	11,756	35,337	23,391
Rental expenses	4,600	2,938	8,740	5,813
Real estate taxes	2,035	1,413	3,539	2,771
Gross profit	11,679	7,405	23,058	14,807
Retail real estate
Segment Reporting Information
Rental revenues	21,544	19,204	42,974	37,459
Rental expenses	3,333	3,013	6,834	5,849
Real estate taxes	2,271	2,180	4,509	4,207
Gross profit	15,940	14,011	31,631	27,403
Multifamily residential real estate
Segment Reporting Information
Rental revenues	15,366	16,418	31,548	32,269
Rental expenses	4,752	5,341	9,780	10,462
Real estate taxes	1,531	1,872	3,193	3,793
Gross profit	$ 9,083	$ 9,205	$ 18,575	$ 18,014