Schedule III - Real Estate Assets and Accumulated Depreciation (Property Table) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Real Estate and Accumulated Depreciation
Encumbrances	$ 686,657
Land, Initial Cost	278,638
Buildings and Improvements, Initial Cost	1,048,681
Total, Initial Cost	1,327,319
Costs Capitalized Subsequent to Acquisition	28,527
Land, Gross Amount	278,639
Buildings and Improvements, Gross Amount	1,077,207
Total, Gross Amount	1,355,846	$ 817,763	$ 591,005	$ 290,212
Accumulated Depreciation	(51,719)	$ (30,574)	$ (18,172)	$ (6,337)
Bishop’s Square
Real Estate and Accumulated Depreciation
Encumbrances	61,907
Land, Initial Cost	0
Buildings and Improvements, Initial Cost	53,653
Total, Initial Cost	53,653
Costs Capitalized Subsequent to Acquisition	21,771
Land, Gross Amount	0
Buildings and Improvements, Gross Amount	75,424
Total, Gross Amount	75,424
Accumulated Depreciation	(7,039)
Domain Apartments
Real Estate and Accumulated Depreciation
Encumbrances	34,300
Land, Initial Cost	5,690
Buildings and Improvements, Initial Cost	50,790
Total, Initial Cost	56,480
Costs Capitalized Subsequent to Acquisition	291
Land, Gross Amount	5,690
Buildings and Improvements, Gross Amount	51,081
Total, Gross Amount	56,771
Accumulated Depreciation	(6,947)
Cottonwood Corporate Center
Real Estate and Accumulated Depreciation
Encumbrances	72,359
Land, Initial Cost	13,600
Buildings and Improvements, Initial Cost	98,758
Total, Initial Cost	112,358
Costs Capitalized Subsequent to Acquisition	2,114
Land, Gross Amount	13,600
Buildings and Improvements, Gross Amount	100,872
Total, Gross Amount	114,472
Accumulated Depreciation	(8,903)
Goodyear Crossing II
Real Estate and Accumulated Depreciation
Encumbrances	29,000
Land, Initial Cost	7,270
Buildings and Improvements, Initial Cost	41,620
Total, Initial Cost	48,890
Costs Capitalized Subsequent to Acquisition	1,425
Land, Gross Amount	7,270
Buildings and Improvements, Gross Amount	43,045
Total, Gross Amount	50,315
Accumulated Depreciation	(3,574)
Rookwood
Real Estate and Accumulated Depreciation
Encumbrances	96,000
Land, Initial Cost	45,320
Buildings and Improvements, Initial Cost	132,466
Total, Initial Cost	177,786
Costs Capitalized Subsequent to Acquisition	534
Land, Gross Amount	45,319
Buildings and Improvements, Gross Amount	133,001
Total, Gross Amount	178,320
Accumulated Depreciation	(9,971)
Montrose Student Residences
Real Estate and Accumulated Depreciation
Encumbrances	25,352
Land, Initial Cost	5,919
Buildings and Improvements, Initial Cost	35,058
Total, Initial Cost	40,977
Costs Capitalized Subsequent to Acquisition	774
Land, Gross Amount	5,919
Buildings and Improvements, Gross Amount	35,832
Total, Gross Amount	41,751
Accumulated Depreciation	(2,610)
Queen's Court Student Residences
Real Estate and Accumulated Depreciation
Encumbrances	38,896
Land, Initial Cost	13,989
Buildings and Improvements, Initial Cost	50,392
Total, Initial Cost	64,381
Costs Capitalized Subsequent to Acquisition	2,806
Land, Gross Amount	13,989
Buildings and Improvements, Gross Amount	53,198
Total, Gross Amount	67,187
Accumulated Depreciation	(3,123)
Venue Museum District
Real Estate and Accumulated Depreciation
Encumbrances	45,000
Land, Initial Cost	17,409
Buildings and Improvements, Initial Cost	52,538
Total, Initial Cost	69,947
Costs Capitalized Subsequent to Acquisition	42
Land, Gross Amount	17,409
Buildings and Improvements, Gross Amount	52,580
Total, Gross Amount	69,989
Accumulated Depreciation	(1,778)
Fresh Park Venlo
Real Estate and Accumulated Depreciation
Encumbrances	84,092
Land, Initial Cost	0
Buildings and Improvements, Initial Cost	124,696
Total, Initial Cost	124,696
Costs Capitalized Subsequent to Acquisition	1,050
Land, Gross Amount	0
Buildings and Improvements, Gross Amount	125,746
Total, Gross Amount	125,746
Accumulated Depreciation	(4,024)
Maintal Logistics
Real Estate and Accumulated Depreciation
Encumbrances	26,136
Land, Initial Cost	14,787
Buildings and Improvements, Initial Cost	29,685
Total, Initial Cost	44,472
Costs Capitalized Subsequent to Acquisition	741
Land, Gross Amount	14,787
Buildings and Improvements, Gross Amount	30,426
Total, Gross Amount	45,213
Accumulated Depreciation	(752)
ABC Westland
Real Estate and Accumulated Depreciation
Encumbrances	82,655
Land, Initial Cost	59,744
Buildings and Improvements, Initial Cost	74,153
Total, Initial Cost	133,897
Costs Capitalized Subsequent to Acquisition	(3,021)
Land, Gross Amount	59,744
Buildings and Improvements, Gross Amount	71,132
Total, Gross Amount	130,876
Accumulated Depreciation	(1,409)
The Promenade Shops at Briargate
Real Estate and Accumulated Depreciation
Encumbrances	0
Land, Initial Cost	19,199
Buildings and Improvements, Initial Cost	55,425
Total, Initial Cost	74,624
Costs Capitalized Subsequent to Acquisition	0
Land, Gross Amount	19,199
Buildings and Improvements, Gross Amount	55,425
Total, Gross Amount	74,624
Accumulated Depreciation	(418)
Gdansk PL II
Real Estate and Accumulated Depreciation
Encumbrances	18,790
Land, Initial Cost	6,350
Buildings and Improvements, Initial Cost	19,236
Total, Initial Cost	25,586
Costs Capitalized Subsequent to Acquisition	0
Land, Gross Amount	6,350
Buildings and Improvements, Gross Amount	19,236
Total, Gross Amount	25,586
Accumulated Depreciation	(130)
Lodz Urban Logistics
Real Estate and Accumulated Depreciation
Encumbrances	15,211
Land, Initial Cost	0
Buildings and Improvements, Initial Cost	19,588
Total, Initial Cost	19,588
Costs Capitalized Subsequent to Acquisition	0
Land, Gross Amount	0
Buildings and Improvements, Gross Amount	19,588
Total, Gross Amount	19,588
Accumulated Depreciation	(132)
Glasgow West End
Real Estate and Accumulated Depreciation
Encumbrances	56,959
Land, Initial Cost	23,627
Buildings and Improvements, Initial Cost	70,273
Total, Initial Cost	93,900
Costs Capitalized Subsequent to Acquisition	0
Land, Gross Amount	23,627
Buildings and Improvements, Gross Amount	70,273
Total, Gross Amount	93,900
Accumulated Depreciation	(493)
The Alloy
Real Estate and Accumulated Depreciation
Encumbrances	0
Land, Initial Cost	14,194
Buildings and Improvements, Initial Cost	81,971
Total, Initial Cost	96,165
Costs Capitalized Subsequent to Acquisition	0
Land, Gross Amount	14,194
Buildings and Improvements, Gross Amount	81,971
Total, Gross Amount	96,165
Accumulated Depreciation	(275)
Charles Tyrwhitt DC
Real Estate and Accumulated Depreciation
Encumbrances	0
Land, Initial Cost	7,190
Buildings and Improvements, Initial Cost	11,490
Total, Initial Cost	18,680
Costs Capitalized Subsequent to Acquisition	0
Land, Gross Amount	7,190
Buildings and Improvements, Gross Amount	11,490
Total, Gross Amount	18,680
Accumulated Depreciation	(42)
DSG Bristol
Real Estate and Accumulated Depreciation
Encumbrances	0
Land, Initial Cost	18,163
Buildings and Improvements, Initial Cost	23,069
Total, Initial Cost	41,232
Costs Capitalized Subsequent to Acquisition	0
Land, Gross Amount	18,161
Buildings and Improvements, Gross Amount	23,071
Total, Gross Amount	41,232
Accumulated Depreciation	(69)
Royal Mail Edinburgh
Real Estate and Accumulated Depreciation
Encumbrances	0
Land, Initial Cost	6,187
Buildings and Improvements, Initial Cost	23,820
Total, Initial Cost	30,007
Costs Capitalized Subsequent to Acquisition	0
Land, Gross Amount	6,191
Buildings and Improvements, Gross Amount	23,816
Total, Gross Amount	30,007
Accumulated Depreciation	$ (30)