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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)
 1 Months Ended 12 Months Ended
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