Identifiable net assets (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Assets	$ 705,673	$ 709,166
Cash	153,139	158,415
Industrial Commercial [Member]
Segment Reporting Information [Line Items]
Assets	38,490	38,784
Asset Management [Member]
Segment Reporting Information [Line Items]
Assets	48,281	48,072
Development [Member]
Segment Reporting Information [Line Items]
Assets	142,908	212,384
Multifamily Segment [Member]
Segment Reporting Information [Line Items]
Assets	321,613	249,750
Unallocated Corporate Assets [Member]
Segment Reporting Information [Line Items]
Assets	$ 1,242	$ 1,761