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Notes Payable, Bank Credit Facility, Interest and Amortization of Deferred Debt Costs - Narrative (Details)
 3 Months Ended
Mar. 31, 2024
USD ($)
Oct. 01, 2030
Oct. 01, 2027
Dec. 31, 2023
USD ($)
Jun. 30, 2023
USD ($)
Aug. 23, 2022
USD ($)
swap
Debt Instrument [Line Items]            
Revolving credit facility payable, net $ 272,909,000     $ 274,715,000    
Number of interest rate swaps | swap           2
Construction loans payable, net 108,917,000     77,305,000    
Long-term debt 1,408,650,000          
Principal amount 1,427,291,000     1,410,000,000    
Debt outstanding with fixed-rate 1,150,000,000     1,130,000,000    
Debt outstanding with variable-rate 274,000,000     276,000,000    
Carrying value of properties collateralizing mortgage notes 1,560,000,000     1,520,000,000    
Unamortized deferred debt costs 18,641,000     19,300,000    
Debt issuance costs amortization 11,300,000     10,600,000    
Interest rate swaps            
Debt Instrument [Line Items]            
Derivative asset 4,500,000          
Avenel Business Park            
Debt Instrument [Line Items]            
Guarantor obligations, maximum exposure $ 6,300,000          
Twinbrook Quarter            
Debt Instrument [Line Items]            
Guarantor Obligations, Liquidation Proceeds, Percentage 100.00%          
Twinbrook Quarter            
Debt Instrument [Line Items]            
Long-term debt       92,800,000    
Hampden House            
Debt Instrument [Line Items]            
Guarantor obligations, maximum exposure       21,400,000    
Guarantor Obligations, Liquidation Proceeds, Percentage 100.00%          
Guarantor Obligations, Current Carrying Value $ 26,600,000          
Secured Overnight Financing Rate (SOFR)            
Debt Instrument [Line Items]            
Interest rate spread on LIBOR 0.10%          
Revolving Credit Facility | Secured Overnight Financing Rate (SOFR)            
Debt Instrument [Line Items]            
Interest rate spread on LIBOR 1.40%          
Term Facility | Secured Overnight Financing Rate (SOFR)            
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 $ 127,600,000          
Revolving credit facility payable, net 374,000,000          
Line of Credit            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity 525,000,000          
Line of Credit | Revolving Credit Facility            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity 425,000,000          
Line of Credit | Term Facility            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity $ 100,000,000          
Line of credit facility, extension term 1 year          
Line of Credit | Unsecured Revolving Credit Facility            
Debt Instrument [Line Items]            
Revolving credit facility payable, net $ 274,000,000          
Secured Debt | Term Loan            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity           $ 100,000,000
Secured Debt | Term Loan | Agreement Ending October 1, 2030            
Debt Instrument [Line Items]            
Derivative, notional amount           50,000,000
Secured Debt | Term Loan | Agreement Ending October 1, 2027            
Debt Instrument [Line Items]            
Derivative, notional amount           $ 50,000,000
Secured Debt | Construction-to-Permanent Loan            
Debt Instrument [Line Items]            
Debt instrument, face amount 18,600,000     133,000,000    
Secured Debt | Secured Overnight Financing Rate (SOFR) | Term Loan | Agreement Ending October 1, 2030 | Forecast            
Debt Instrument [Line Items]            
Derivative, fixed interest rate (as a percent)   2.91%        
Secured Debt | Secured Overnight Financing Rate (SOFR) | Term Loan | Agreement Ending October 1, 2027 | Forecast            
Debt Instrument [Line Items]            
Derivative, fixed interest rate (as a percent)     2.96%      
Construction Loans | Construction-to-Permanent Loan            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity         $ 145,000,000  
Construction loans payable, net 90,300,000          
Mortgages | Avenel Business Park            
Debt Instrument [Line Items]            
Long-term debt 21,300,000          
Mortgages | The Waycroft Mortgage            
Debt Instrument [Line Items]            
Guarantor obligations, maximum exposure 23,600,000          
Long-term debt $ 148,100,000          
Mortgages | Ashbrook Marketplace Mortgage            
Debt Instrument [Line Items]            
Long-term debt       20,100,000    
Mortgages | Kentlands Place Mortgage            
Debt Instrument [Line Items]            
Long-term debt       $ 27,100,000