Organization (Details)	Dec. 31, 2021 ft² a apartment property	Dec. 31, 2020	Dec. 31, 2019
Commercial Properties
Real Estate Properties [Line Items]
Number of real estate properties	5
Area of real estate property | ft²	1,063,515
Office Building
Real Estate Properties [Line Items]
Number of real estate properties	4
Retail Site
Real Estate Properties [Line Items]
Number of real estate properties	1
Apartment Building
Real Estate Properties [Line Items]
Number of real estate properties	9
Number of units in real estate property | apartment	1,492
Developed and Undeveloped Land
Real Estate Properties [Line Items]
Area of land | a	1,875
Unconsolidated joint venture
Real Estate Properties [Line Items]
Number of units in real estate property | apartment	10,281
Unconsolidated joint venture | Apartment Building
Real Estate Properties [Line Items]
Number of real estate properties	52
ARL | Related party entities | Majority Shareholder
Real Estate Properties [Line Items]
Ownership interest	80.00%
TCI
Real Estate Properties [Line Items]
Ownership interest	78.40%	78.40%	78.40%