| Organization (Details) ft² in Millions | Jun. 30, 2024  $ / shares | Jun. 30, 2024  building | Jun. 30, 2024  landParcel | Jun. 30, 2024  property | Jun. 30, 2024  office_property | Jun. 30, 2024  ft² | Jun. 30, 2024  state | Dec. 31, 2023  $ / shares | 
|---|---|---|---|---|---|---|---|---|
| Real Estate Properties [Line Items] | ||||||||
| Common stock, par value (in dollars per share) | $ / shares | $ 0.001 | $ 0.001 | ||||||
| Number of properties | office_property | 69 | |||||||
| Area of real estate property (in sqft) | ft² | 8.0 | |||||||
| Number of states with real estate properties owned | state | 29 | |||||||
| Arch Street Joint Venture | ||||||||
| Real Estate Properties [Line Items] | ||||||||
| Number of properties | property | 6 | |||||||
| Area of real estate property (in sqft) | ft² | 1.0 | |||||||
| Number of states with real estate properties owned | state | 6 | |||||||
| Non-Operating Properties | ||||||||
| Real Estate Properties [Line Items] | ||||||||
| Number of properties | property | 6 | |||||||
| Property in Amherst, New York | Operating Properties | ||||||||
| Real Estate Properties [Line Items] | ||||||||
| Number of properties | 2 | 2 | 
| X | ||||||||||
| 
- Definition Number Of States With Real Estate Properties Owned No definition available. 
 | 
| X | ||||||||||
| 
- Definition Area of a real estate property. No definition available. 
 | 
| X | ||||||||||
| 
- Definition Face amount or stated value per share of common stock. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
 | 
| X | ||||||||||
| 
- Definition The number of real estate properties owned as of the balance sheet date. No definition available. 
 | 
| X | ||||||||||
| 
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
 | 
| X | ||||||||||
| 
- Details 
 | 
| X | ||||||||||
| 
- Details 
 | 
| X | ||||||||||
| 
- Details 
 | 
| X | ||||||||||
| 
- Details 
 |