Real Estate Assets - Table of Properties Acquired (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) ft²	Dec. 31, 2018 USD ($) ft²
Business Acquisition
Number of units in real estate property	477	1,347
Restricted Cash and Cash Equivalents | $	$ 42,872,000	$ 48,732,000
gayton crossing [Domain]
Business Acquisition
Area of Real Estate Property	158,316
viera [Domain]
Business Acquisition
Number of units in real estate property	259
five oaks [Member]
Business Acquisition
Number of units in real estate property	218
Multifamily Acquisitions [Member]
Business Acquisition
business combination purchase price | $	$ 248,400,000	$ 158,600,000
Luxe Sorrel II [Member]
Business Acquisition
Number of units in real estate property	265
Green Park [Member]
Business Acquisition
Number of units in real estate property	310
Lenox Portfolio [Member]
Business Acquisition
Net Rentable Area	47,600
hidden river [Member]
Business Acquisition
Number of units in real estate property	300
vestavia reserve [Domain]
Business Acquisition
Number of units in real estate property	272
free state [Domain]
Business Acquisition
Area of Real Estate Property	264,152
disston plaza [Member]
Business Acquisition
Area of Real Estate Property	129,150
polo grounds [Domain]
Business Acquisition
Area of Real Estate Property	130,285
fairfield [Domain]
Business Acquisition
Area of Real Estate Property	231,829
berry town center [Domain]
Business Acquisition
Area of Real Estate Property	99,441
Hanover Shopping Center [Domain]
Business Acquisition
Area of Real Estate Property	305,346
Greensboro Village [Member]
Business Acquisition
Area of Real Estate Property		70,203
Governors Towne Square [Member]
Business Acquisition
Area of Real Estate Property		68,658
neapolitan way [Domain]
Business Acquisition
Area of Real Estate Property		137,580
conway plaza [Member]
Business Acquisition
Area of Real Estate Property		117,705
Brawley Commons [Member]
Business Acquisition
Area of Real Estate Property		122,028
citypark view II [Member]
Business Acquisition
Number of units in real estate property	200
hollymead [Domain]
Business Acquisition
Area of Real Estate Property		158,807
Office Building [Member]
Business Acquisition
business combination purchase price | $	$ 250,600,000	$ 448,300,000
150 Fayetteville [Member]
Business Acquisition
Net Rentable Area		560,000
CAPTRUST Tower [Domain]
Business Acquisition
Net Rentable Area	300,000
Luxe Sorrel II [Member]
Business Acquisition
Net Rentable Area		187,000
251 armour drive [Domain]
Business Acquisition
Net Rentable Area	35,000
Morrocroft Centre [Domain]
Business Acquisition
Net Rentable Area	291,000
capitol towers [Domain]
Business Acquisition
Net Rentable Area	479,000
haven charlotte [Member]
Business Acquisition
Number of beds, student housing	887
Number of units in real estate property	332
Office Building [Member]
Business Acquisition
Net Rentable Area	626,000	1,226,000
New Market Properties [Member]
Business Acquisition
Area of Real Estate Property	1,318,519	674,981
business combination purchase price | $	$ 92,400,000	$ 197,000,000
Retail Site [Member]
Business Acquisition
Area of Real Estate Property	6,041,629	4,730,695
the tradition [Domain]
Business Acquisition
Number of beds, student housing	808
Number of units in real estate property	427
retreat at orlando [Domain]
Business Acquisition
Number of beds, student housing	894
Number of units in real estate property	221
Lubbock II [Member]
Business Acquisition
Number of beds, student housing	556
Number of units in real estate property	140
student housing [Member]
Business Acquisition
Number of units in real estate property	2,011	1,679
Number of beds, student housing		2,258
Number of units in real estate property		788