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Real Estate (Narrative) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) ft² | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) ft² | Sep. 30, 2022 USD ($) | Sep. 26, 2023 ft² | Jul. 20, 2023 ft² | Jun. 01, 2023 ft² | Apr. 29, 2023 ft² | Jan. 30, 2023 ft² | Jan. 05, 2023 ft²
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |
Depreciation and amortization | $ | $ 207,435 | $ 190,675 | $ 618,746 | $ 551,445 |  |  |  |  |  |
Construction in Progress |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | 2,800,000 |  | 2,800,000 |  |  |  |  |  |  |
290 Binney |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) |  |  |  |  |  |  |  |  |  | 566,000
Leased percentage |  |  |  |  |  |  |  |  |  | 100.00%
300 Binney Street |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) |  |  |  |  |  |  |  |  | 195,000 |
Depreciation and amortization | $ |  |  | $ 11,000 |  |  |  |  |  |  |
300 Binney Street | Construction in Progress |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) |  |  |  |  |  |  |  |  | 236,000 |
Leased percentage |  |  |  |  |  |  |  |  | 100.00% |
2100 Pennsylvania Avenue |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) |  |  |  |  |  |  |  | 476,000 |  |
View Boston |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) |  |  |  |  |  |  | 63,000 |  |  |
140 Kendrick Street - Building A |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) |  |  |  |  |  | 104,000 |  |  |  |
180 CityPoint [Member] |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) |  |  |  |  | 329,000 |  |  |  |  |

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