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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) | 1 Months Ended | 12 Months Ended |  |
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Sep. 30, 2021 USD ($) | May 31, 2020 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2021 USD ($) jointVenture segment shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 | Jun. 29, 2018 USD ($) property
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Variable interest entity, number of entities | jointVenture |  |  |  | 3 |  |  |  |
Liabilities |  |  |  | $ 3,657,209,000 | $ 1,333,912,000 |  |  |
Assets |  |  |  | $ 7,639,575,000 | 2,608,539,000 |  |  |
Number of investments in unconsolidated joint ventures | jointVenture |  |  |  | 4 |  |  |  |
Payments to acquire equity method investments |  |  |  | $ 134,000 | 541,000 | $ 798,000 |  |
Gains on sale of operating properties |  |  |  | $ 500,000 | $ 5,900,000 | $ 200,000 |  |
Provision for credit losses, net of recoveries as percent of total revenues |  |  |  | 0.90% | 6.00% | 1.10% |  |
Weighted average limited partnership units outstanding, basic (in shares) | shares |  |  |  | 2,500,000 | 2,200,000 | 2,100,000 |  |
Number of operating segments | segment |  |  |  | 1 |  |  |  |
Limited partners' capital account, units outstanding (in shares) | shares |  |  |  | 2,377,777 | 2,532,861 |  |  |
Amount of rent deferred |  |  |  | $ 2,900,000 | $ 6,100,000 |  |  |
Fed Funds Effective Rate Overnight Index Swap Rate |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Deposit balance basis point spread on interest rate |  |  |  | 0.43% |  |  |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Liabilities |  |  |  | $ 29,000,000 |  |  |  |
Assets |  |  |  | $ 117,000,000 |  |  |  |
Minimum |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Rent deferral agreement, payback period |  |  |  |  | 12 months |  |  |
Maximum |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Rent deferral agreement, payback period |  |  |  |  | 18 months |  |  |
Capital Unit, Class B |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Number of joint ventures in which units are issued | jointVenture |  |  |  | 3 |  |  |  |
Number of joint ventures in which units are issued, noncontrolling interest | jointVenture |  |  |  | 1 |  |  |  |
Operating Partnership |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  |  | 98.90% | 97.10% |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners |  |  |  | 1.10% | 2.90% |  |  |
Co-venturer |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Construction loan payable |  |  |  | $ 33,600,000 |  |  |  |
Three Property Retail Portfolio Joint Venture |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Ownership percentage in equity method investment |  |  |  |  |  |  |  | 20.00%
Embassy Suites Joint Venture |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Ownership percentage in equity method investment |  |  |  | 35.00% |  |  | 35.00% |
Payments to acquire equity method investments |  |  | $ 1,400,000 |  |  |  |  |
Embassy Suites Joint Venture | Co-venturer |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Construction loan payable |  |  |  | $ 33,600,000 |  |  |  |
Embassy Suites Joint Venture | Co-venturer | Construction Loan |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 33,800,000 |  |  |  |
Glendale Multifamily Joint Venture |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Ownership percentage in equity method investment |  | 12.00% |  |  |  |  |  |
Glendale Multifamily Joint Venture | Land |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Contribution of property |  | $ 1,600,000 |  |  |  |  |  |
Buckingham Joint Venture |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Ownership percentage in equity method investment | 50.00% |  |  |  |  |  |  |
Buckingham Joint Venture | Land |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Contribution of property | $ 4,000,000 |  |  |  |  |  |  |
One Loudoun Downtown - Pads G & H Joint Venture |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Ownership percentage in equity method investment |  |  |  | 90.00% |  |  |  |
Payments to acquire equity method investments |  |  |  | $ 400,000 |  |  |  |
Livingston Shopping Center, Plaza Volente, and Tamiami Crossing | Three Property Retail Portfolio Joint Venture |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Number of real estate properties | property |  |  |  |  |  |  |  | 3
Consideration received |  |  |  |  |  |  |  | $ 99,800,000
Equity method investment |  |  |  |  |  |  |  | $ 10,000,000

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