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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 |  |  |  |  |

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