Schedule III - Real Estate and Accumulated Depreciation - Summary of Properties (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) property	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 985,015,000
Initial Cost to Company, Land	185,449,000
Initial Cost to Company, Property	1,115,907,000
Costs Capitalized Subsequent to Acquisition	46,488,000
Gross Amounts Carried at December 31, 2021, Land	185,449,000
Gross Amounts Carried at December 31, 2021, Property	1,162,395,000
Gross Amounts Carried at December 31, 2021, Total	1,347,844,000	$ 2,573,296,000	$ 2,490,630,000	$ 2,972,803,000
Accumulated Depreciation	(181,457,000)	$ (302,143,000)	$ (224,190,000)	$ (187,913,000)
Material costs subsequent to acquisition	0
Income tax basis	$ 1,500,000,000
Hotel - U.S., Midwest
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Number of properties | property	1
Encumbrances	$ 0
Initial Cost to Company, Land	0
Initial Cost to Company, Property	5,565,000
Costs Capitalized Subsequent to Acquisition	1,109,000
Gross Amounts Carried at December 31, 2021, Land	0
Gross Amounts Carried at December 31, 2021, Property	6,674,000
Gross Amounts Carried at December 31, 2021, Total	6,674,000
Accumulated Depreciation	$ (3,373,000)
Medical office - U.S., Midwest
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Number of properties | property	7
Encumbrances	$ 78,048,000
Initial Cost to Company, Land	2,764,000
Initial Cost to Company, Property	97,797,000
Costs Capitalized Subsequent to Acquisition	1,697,000
Gross Amounts Carried at December 31, 2021, Land	2,764,000
Gross Amounts Carried at December 31, 2021, Property	99,494,000
Gross Amounts Carried at December 31, 2021, Total	102,258,000
Accumulated Depreciation	$ (15,882,000)
Medical Office - U.S., North East
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Number of properties | property	7
Encumbrances	$ 191,661,000
Initial Cost to Company, Land	11,283,000
Initial Cost to Company, Property	176,996,000
Costs Capitalized Subsequent to Acquisition	147,000
Gross Amounts Carried at December 31, 2021, Land	11,283,000
Gross Amounts Carried at December 31, 2021, Property	177,143,000
Gross Amounts Carried at December 31, 2021, Total	188,426,000
Accumulated Depreciation	$ (27,119,000)
Medical Office - U.S., South East
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Number of properties | property	6
Encumbrances	$ 107,252,000
Initial Cost to Company, Land	7,930,000
Initial Cost to Company, Property	117,740,000
Costs Capitalized Subsequent to Acquisition	1,008,000
Gross Amounts Carried at December 31, 2021, Land	7,930,000
Gross Amounts Carried at December 31, 2021, Property	118,748,000
Gross Amounts Carried at December 31, 2021, Total	126,678,000
Accumulated Depreciation	$ (19,050,000)
Medical Office - U.S., South West
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Number of properties | property	8
Encumbrances	$ 125,345,000
Initial Cost to Company, Land	15,921,000
Initial Cost to Company, Property	126,842,000
Costs Capitalized Subsequent to Acquisition	1,289,000
Gross Amounts Carried at December 31, 2021, Land	15,921,000
Gross Amounts Carried at December 31, 2021, Property	128,131,000
Gross Amounts Carried at December 31, 2021, Total	144,052,000
Accumulated Depreciation	$ (21,992,000)
Medical Office - U.S., West
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Number of properties | property	6
Encumbrances	$ 97,694,000
Initial Cost to Company, Land	13,415,000
Initial Cost to Company, Property	107,845,000
Costs Capitalized Subsequent to Acquisition	878,000
Gross Amounts Carried at December 31, 2021, Land	13,415,000
Gross Amounts Carried at December 31, 2021, Property	108,723,000
Gross Amounts Carried at December 31, 2021, Total	122,138,000
Accumulated Depreciation	$ (19,763,000)
Mixed Use - U.S., West
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Number of properties | property	1
Encumbrances	$ 8,667,000
Initial Cost to Company, Land	1,003,000
Initial Cost to Company, Property	14,323,000
Costs Capitalized Subsequent to Acquisition	955,000
Gross Amounts Carried at December 31, 2021, Land	1,003,000
Gross Amounts Carried at December 31, 2021, Property	15,278,000
Gross Amounts Carried at December 31, 2021, Total	16,281,000
Accumulated Depreciation	$ (2,592,000)
Multifamily - U.S., South East
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Number of properties | property	1
Encumbrances	$ 7,522,000
Initial Cost to Company, Land	1,284,000
Initial Cost to Company, Property	7,189,000
Costs Capitalized Subsequent to Acquisition	629,000
Gross Amounts Carried at December 31, 2021, Land	1,284,000
Gross Amounts Carried at December 31, 2021, Property	7,818,000
Gross Amounts Carried at December 31, 2021, Total	9,102,000
Accumulated Depreciation	$ (922,000)
Office - U.S., North East
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Number of properties | property	1
Encumbrances	$ 18,958,000
Initial Cost to Company, Land	7,250,000
Initial Cost to Company, Property	10,614,000
Costs Capitalized Subsequent to Acquisition	8,296,000
Gross Amounts Carried at December 31, 2021, Land	7,250,000
Gross Amounts Carried at December 31, 2021, Property	18,910,000
Gross Amounts Carried at December 31, 2021, Total	26,160,000
Accumulated Depreciation	$ (4,286,000)
Office - U.S., South East
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Number of properties | property	1
Encumbrances	$ 24,433,000
Initial Cost to Company, Land	4,879,000
Initial Cost to Company, Property	16,862,000
Costs Capitalized Subsequent to Acquisition	2,808,000
Gross Amounts Carried at December 31, 2021, Land	4,879,000
Gross Amounts Carried at December 31, 2021, Property	19,672,000
Gross Amounts Carried at December 31, 2021, Total	24,551,000
Accumulated Depreciation	$ (6,976,000)
Office - U.S., West
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Number of properties | property	1
Encumbrances	$ 0
Initial Cost to Company, Land	0
Initial Cost to Company, Property	4,261,000
Costs Capitalized Subsequent to Acquisition	8,391,000
Gross Amounts Carried at December 31, 2021, Land	0
Gross Amounts Carried at December 31, 2021, Property	12,652,000
Gross Amounts Carried at December 31, 2021, Total	12,652,000
Accumulated Depreciation	$ (4,170,000)
Retail - U.S., Mid Atlantic
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Number of properties | property	1
Encumbrances	$ 18,000,000
Initial Cost to Company, Land	6,432,000
Initial Cost to Company, Property	6,315,000
Costs Capitalized Subsequent to Acquisition	13,308,000
Gross Amounts Carried at December 31, 2021, Land	6,432,000
Gross Amounts Carried at December 31, 2021, Property	19,623,000
Gross Amounts Carried at December 31, 2021, Total	26,055,000
Accumulated Depreciation	$ (4,518,000)
Retail - U.S., Midwest
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Number of properties | property	7
Encumbrances	$ 79,124,000
Initial Cost to Company, Land	24,384,000
Initial Cost to Company, Property	109,445,000
Costs Capitalized Subsequent to Acquisition	1,403,000
Gross Amounts Carried at December 31, 2021, Land	24,384,000
Gross Amounts Carried at December 31, 2021, Property	110,848,000
Gross Amounts Carried at December 31, 2021, Total	135,232,000
Accumulated Depreciation	$ (17,490,000)
Retail - U.S., North East
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Number of properties | property	1
Encumbrances	$ 11,397,000
Initial Cost to Company, Land	472,000
Initial Cost to Company, Property	12,260,000
Costs Capitalized Subsequent to Acquisition	632,000
Gross Amounts Carried at December 31, 2021, Land	472,000
Gross Amounts Carried at December 31, 2021, Property	12,891,000
Gross Amounts Carried at December 31, 2021, Total	13,363,000
Accumulated Depreciation	$ (2,817,000)
Retail - U.S., South East
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Number of properties | property	5
Encumbrances	$ 43,302,000
Initial Cost to Company, Land	21,353,000
Initial Cost to Company, Property	60,618,000
Costs Capitalized Subsequent to Acquisition	602,000
Gross Amounts Carried at December 31, 2021, Land	21,353,000
Gross Amounts Carried at December 31, 2021, Property	61,220,000
Gross Amounts Carried at December 31, 2021, Total	82,573,000
Accumulated Depreciation	$ (8,069,000)
Retail - U.S., South West
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Number of properties | property	6
Encumbrances	$ 76,112,000
Initial Cost to Company, Land	37,254,000
Initial Cost to Company, Property	78,579,000
Costs Capitalized Subsequent to Acquisition	133,000
Gross Amounts Carried at December 31, 2021, Land	37,254,000
Gross Amounts Carried at December 31, 2021, Property	78,711,000
Gross Amounts Carried at December 31, 2021, Total	115,965,000
Accumulated Depreciation	$ (13,289,000)
Retail - U.S., West
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Number of properties | property	2
Encumbrances	$ 33,000,000
Initial Cost to Company, Land	18,633,000
Initial Cost to Company, Property	36,794,000
Costs Capitalized Subsequent to Acquisition	0
Gross Amounts Carried at December 31, 2021, Land	18,633,000
Gross Amounts Carried at December 31, 2021, Property	36,794,000
Gross Amounts Carried at December 31, 2021, Total	55,427,000
Accumulated Depreciation	$ (5,414,000)
Self-Storage - U.S., North East
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Number of properties | property	1
Encumbrances	$ 14,500,000
Initial Cost to Company, Land	2,202,000
Initial Cost to Company, Property	11,498,000
Costs Capitalized Subsequent to Acquisition	370,000
Gross Amounts Carried at December 31, 2021, Land	2,202,000
Gross Amounts Carried at December 31, 2021, Property	11,868,000
Gross Amounts Carried at December 31, 2021, Total	14,070,000
Accumulated Depreciation	$ (2,051,000)
Industrial - U.S., South East
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Number of properties | property	2
Encumbrances	$ 50,000,000
Initial Cost to Company, Land	8,990,000
Initial Cost to Company, Property	10,276,000
Costs Capitalized Subsequent to Acquisition	2,833,000
Gross Amounts Carried at December 31, 2021, Land	8,990,000
Gross Amounts Carried at December 31, 2021, Property	13,109,000
Gross Amounts Carried at December 31, 2021, Total	22,099,000
Accumulated Depreciation	$ (1,684,000)
Residential - U.S., North East
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Number of properties | property	1
Encumbrances	$ 0
Initial Cost to Company, Land	0
Initial Cost to Company, Property	104,088,000
Costs Capitalized Subsequent to Acquisition	0
Gross Amounts Carried at December 31, 2021, Land	0
Gross Amounts Carried at December 31, 2021, Property	104,088,000
Gross Amounts Carried at December 31, 2021, Total	104,088,000
Accumulated Depreciation	$ 0