Segments - Net Income of Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information
Rental revenues	$ 45,741	$ 42,289
Rental expenses	10,832	9,375
Real estate taxes	5,306	4,333
Segment revenues	35,563	47,268
Gross profit	30,891	30,299
Office real estate
Segment Reporting Information
Rental revenues	11,635	10,192
Rental expenses	2,875	2,546
Real estate taxes	1,358	1,146
Gross profit	7,402	6,500
Retail real estate
Segment Reporting Information
Rental revenues	18,255	20,411
Rental expenses	2,836	3,020
Real estate taxes	2,027	2,166
Gross profit	13,392	15,225
Multifamily residential real estate
Segment Reporting Information
Rental revenues	15,851	11,686
Rental expenses	5,121	3,809
Real estate taxes	1,921	1,021
Gross profit	8,809	6,856
General contracting and real estate services \| General contracting and real estate services
Segment Reporting Information
Segment revenues	35,563	47,268
Segment expenses	34,275	45,550
Gross profit	$ 1,288	$ 1,718

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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