Organization - Narratives (Details) ft² in Millions, $ in Millions	12 Months Ended	39 Months Ended	120 Months Ended
	Dec. 31, 2021 ft² property segment tenant	Apr. 02, 2015 USD ($)	Dec. 31, 2021 USD ($) ft² property tenant	Dec. 20, 2019 property
Additional Disclosures
Capital interest ownership in operating partnership	99.97%		99.97%
Number of properties (property)	53		53
Number of tenants | tenant	50		50
Area of real estate property (sqft) | ft²	10.4		10.4
Number of reportable segments | segment	3
Public Offering
Proceeds from issuance of shares | $		$ 1,200.0
Class A
Public Offering
Distributions reinvested through the DRIP | $			$ 220.4
Class C
Public Offering
Distributions reinvested through the DRIP | $			$ 63.7
Student Housing Developments
Additional Disclosures
Number of properties (property)	3		3
Lease term (years)				25 years
Student Housing Developments | One multi-family residential property
Additional Disclosures
Number of properties (property)				11
Operating Real Estate
Additional Disclosures
Area of real estate property (sqft) | ft²	5.1		5.1
Operating Real Estate | Self Storage
Additional Disclosures
Number of properties (property)	65		65
Operating Real Estate | Student Housing Developments
Additional Disclosures
Number of properties (property)	1		1
Operating Real Estate | Student Housing Developments | Net Lease Agreement
Additional Disclosures
Number of properties (property)	2		2
Operating Real Estate | Student Housing Developments | Net Lease Agreement | Six student housing developments
Additional Disclosures
Properties placed into service (property)	9