Segments - Net Income of Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information
Rental revenues	$ 59,951	$ 55,224	$ 116,169	$ 109,859
Rental expenses	13,676	12,685	26,636	25,354
Real estate taxes	5,631	5,837	11,043	11,241
General contracting and real estate services revenues	102,574	45,273	186,812	69,923
Segment gross profit	46,563	40,979	89,916	81,004
Office Real Estate
Segment Reporting Information
Rental revenues	20,505	18,314	40,079	35,337
Rental expenses	5,254	4,600	10,357	8,740
Real estate taxes	2,167	2,035	4,262	3,539
Interest expense	2,200	2,700	4,600	4,800
Segment gross profit	13,084	11,679	25,460	23,058
Retail Real Estate
Segment Reporting Information
Rental revenues	24,708	21,544	47,146	42,974
Rental expenses	4,026	3,333	7,590	6,834
Real estate taxes	2,270	2,271	4,477	4,509
Interest expense	2,300	2,000	4,400	4,000
Segment gross profit	18,412	15,940	35,079	31,631
Multifamily Real Estate
Segment Reporting Information
Rental revenues	14,738	15,366	28,944	31,548
Rental expenses	4,396	4,752	8,689	9,780
Real estate taxes	1,194	1,531	2,304	3,193
Interest expense	2,600	3,300	5,200	6,500
Segment gross profit	9,148	9,083	17,951	18,575
General Contracting and Real Estate Services
Segment Reporting Information
General contracting and real estate services revenues	102,574	45,273	186,812	69,923
General contracting and real estate services expenses	99,071	43,418	180,241	67,239
Segment gross profit	3,503	1,855	6,571	2,684
Real Estate Financing
Segment Reporting Information
Interest income	3,225	3,239	6,761	6,698
Interest expense	809	817	1,906	1,642
Segment gross profit	$ 2,416	$ 2,422	$ 4,855	$ 5,056