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Notes Payable, Bank Credit Facility, Interest and Amortization of Deferred Debt Costs - Narrative (Details)
 6 Months Ended
May 28, 2024
USD ($)
Jun. 30, 2024
USD ($)
Oct. 01, 2030
Oct. 01, 2027
Dec. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Aug. 23, 2022
USD ($)
swap
Debt Instrument [Line Items]              
Interest rate spread on LIBOR   0.10%          
Revolving credit facility payable, net   $ 235,102,000     $ 274,715,000    
Number of interest rate swaps | swap             2
Principal amount   1,462,549,000     1,410,000,000    
Construction loans payable, net   141,765,000     77,305,000    
Long-term debt   1,442,604,000          
Debt outstanding with fixed-rate   1,230,000,000     1,130,000,000    
Debt outstanding with variable-rate   236,000,000     276,000,000.0    
Carrying value of properties collateralizing mortgage notes   1,610,000,000     1,520,000,000    
Unamortized deferred debt costs   19,945,000     19,300,000    
Debt issuance costs amortization   10,500,000     10,600,000    
Interest rate swaps              
Debt Instrument [Line Items]              
Derivative asset   $ 4,800,000          
Twinbrook Quarter              
Debt Instrument [Line Items]              
Guarantor Obligations, Liquidation Proceeds, Percentage   100.00%          
Twinbrook Quarter              
Debt Instrument [Line Items]              
Long-term debt         104,800,000    
Hampden House              
Debt Instrument [Line Items]              
Guarantor obligations, maximum exposure         42,200,000    
Guarantor Obligations, Liquidation Proceeds, Percentage   100.00%          
Guarantor obligations, current carrying value   $ 26,600,000          
Revolving Credit Facility              
Debt Instrument [Line Items]              
Interest rate spread on LIBOR   1.40%          
Term Facility              
Debt Instrument [Line Items]              
Interest rate spread on LIBOR   1.35%          
Unsecured Revolving Credit Facility              
Debt Instrument [Line Items]              
Line of credit facility, remaining borrowing capacity   $ 161,500,000          
Revolving credit facility payable, net   336,000,000.0          
Letter of Credit              
Debt Instrument [Line Items]              
Revolving credit facility payable, net   185,000          
Line of Credit              
Debt Instrument [Line Items]              
Line of credit facility, maximum borrowing capacity   525,000,000.0          
Line of Credit | Revolving Credit Facility              
Debt Instrument [Line Items]              
Line of credit facility, maximum borrowing capacity   425,000,000.0          
Line of Credit | Term Facility              
Debt Instrument [Line Items]              
Line of credit facility, maximum borrowing capacity   $ 100,000,000.0          
Line of credit facility, extension term   1 year          
Line of Credit | Unsecured Revolving Credit Facility              
Debt Instrument [Line Items]              
Revolving credit facility payable, net   $ 236,000,000.0          
Secured Debt | Term Loan              
Debt Instrument [Line Items]              
Line of credit facility, maximum borrowing capacity             $ 100,000,000.0
Secured Debt | Term Loan | Agreement Ending October 1, 2027              
Debt Instrument [Line Items]              
Derivative, notional amount             50,000,000.0
Secured Debt | Term Loan | Agreement Ending October 1, 2027 | Forecast              
Debt Instrument [Line Items]              
Derivative, fixed interest rate (as a percent)       2.96%      
Secured Debt | Term Loan | Agreement Ending October 1, 2030              
Debt Instrument [Line Items]              
Derivative, notional amount             $ 50,000,000.0
Secured Debt | Term Loan | Agreement Ending October 1, 2030 | Forecast              
Debt Instrument [Line Items]              
Derivative, fixed interest rate (as a percent)     2.91%        
Secured Debt | Construction-to-Permanent Loan              
Debt Instrument [Line Items]              
Debt instrument, face amount   39,500,000     133,000,000    
Mortgages | Avenel Business Park, Leesburg Pike Plaza Center, and White Oak Shopping Center              
Debt Instrument [Line Items]              
Long-term debt, term 13 years 4 months 24 days            
Debt instrument, face amount $ 100,000,000            
Debt instrument, interest rate, stated percentage 6.38%            
Debt instrument, periodic payment $ 686,300            
Amortization period 23 years 4 months 24 days            
Debt instrument, payment at maturity $ 61,500,000            
Repayments of debt $ 51,200,000            
Principal amount   138,000,000          
Mortgages | Kentlands Place Mortgage              
Debt Instrument [Line Items]              
Long-term debt         26,900,000    
Mortgages | The Waycroft Mortgage              
Debt Instrument [Line Items]              
Long-term debt   147,200,000          
Guarantor obligations, maximum exposure   23,600,000          
Mortgages | Ashbrook Marketplace Mortgage              
Debt Instrument [Line Items]              
Long-term debt         $ 19,900,000    
Construction Loans | Construction-to-Permanent Loan              
Debt Instrument [Line Items]              
Line of credit facility, maximum borrowing capacity           $ 145,000,000  
Construction loans payable, net   $ 102,300,000