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BUSINESS AND ORGANIZATION - Narrative (Details) $ / shares in Units, ft² in Millions		1 Months Ended	3 Months Ended	9 Months Ended
	Sep. 14, 2021 $ / shares shares	Aug. 31, 2017 shares	Sep. 30, 2021 property ft² $ / shares shares	Sep. 30, 2021 property ft² $ / shares shares	Aug. 04, 2021 $ / shares	Jun. 29, 2021 USD ($)	May 05, 2021 $ / shares	Feb. 01, 2021 $ / shares	Jan. 31, 2021 $ / shares	Jan. 27, 2021 USD ($) $ / shares	Jan. 22, 2021 USD ($)	Dec. 31, 2020 $ / shares shares	Sep. 30, 2020 lease	Dec. 31, 2019 $ / shares	Dec. 23, 2019 USD ($)	Dec. 31, 2016 USD ($)	Jul. 15, 2015 USD ($)
Business And Organization [Line Items]
Issued common stock (in shares)			450,000,000	450,000,000
Preferred stock, shares authorized (in shares)			50,000,000	50,000,000
Number of square feet of aggregate leasable space (in square foot) | ft²			2.2	2.2
Number of real estate properties | property			38	38
Net asset value (in usd per share) | $ / shares					$ 26.05		$ 24.61			$ 23.03				$ 30.48
Primary Offering
Business And Organization [Line Items]
Common stock subscriptions | $																	$ 30,000,000
Registered Offering
Business And Organization [Line Items]
Common stock subscriptions | $																	$ 3,333,333
Real Estate Investment | Tenant-in-common
Business And Organization [Line Items]
Ownership percentage			72.70%	72.70%
Retail
Business And Organization [Line Items]
Number of square feet of aggregate leasable space (in square foot) | lease													113,376
Number of real estate properties | property			13	13
Office
Business And Organization [Line Items]
Number of real estate properties | property			14	14
Industrial
Business And Organization [Line Items]
Number of real estate properties | property			11	11
Operating Partnership
Business And Organization [Line Items]
Ownership interest (as a percent)				86.00%
Class S
Business And Organization [Line Items]
Common stock, shares authorized (in shares)			100,000,000	100,000,000								100,000,000
Common stock, par value (in usd per share) | $ / shares			$ 0.001	$ 0.001				$ 0.001	$ 0.003			$ 0.001
Issuance of common stock (in shares)		33,333,333
Class C
Business And Organization [Line Items]
Common stock, shares authorized (in shares)			300,000,000	300,000,000								300,000,000
Common stock, par value (in usd per share) | $ / shares			$ 0.001	$ 0.001				$ 0.001	$ 0.003			$ 0.001
Common stock subscriptions | $															$ 800,000,000
Stock repurchase program, minimum share value | $																$ 500
Class C | Distribution Reinvestment Plan
Business And Organization [Line Items]
Common stock subscriptions | $						$ 75,000,000									75,000,000
Class C | Follow-on Offering
Business And Organization [Line Items]
Common stock subscriptions | $										$ 600,547,672					$ 725,000,000
Class C | 2021 Distribution Reinvestment Plan Offering
Business And Organization [Line Items]
Common stock subscriptions | $											$ 100,000,000
Series A Preferred Stock
Business And Organization [Line Items]
Preferred stock, shares authorized (in shares)			2,000,000	2,000,000
Preferred stock, par value (in usd per share) | $ / shares	$ 0.001
Preferred stock, dividend rate, percentage				7.375%
Sale of stock, price per share | $ / shares	$ 25.00
Series A Preferred Stock | Primary Offering
Business And Organization [Line Items]
Shares sold in offering (in shares)	1,800,000
Series A Preferred Stock | Over-Allotment Option
Business And Organization [Line Items]
Shares sold in offering (in shares)	200,000
Class C and Class S
Business And Organization [Line Items]
Net asset value (in usd per share) | $ / shares			$ 27.29	$ 27.29
Preferred Stock
Business And Organization [Line Items]
Preferred stock, shares authorized (in shares)			50,000,000	50,000,000
Preferred stock, par value (in usd per share) | $ / shares			$ 0.001	$ 0.001
Preferred Stock | Series A Preferred Stock
Business And Organization [Line Items]
Issuance of common stock (in shares)			2,000,000	2,000,000

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