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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2024
Non-cash Investing and Financing Activities | Non-cash investing and financing activities are summarized as follows (in millions):
| For the Year Ended December 31, |
| 2024 |  |  | 2023 |  |  | 2022 |
Contribution of net assets to Curbline Properties | $ | 1,152.7 |  |  | $ | — |  |  | $ | — |
Assumption of buildings due to ground lease terminations |  | 2.7 |  |  |  | — |  |  |  | 2.9 |
Consolidation of the net assets (excluding mortgages as disclosed below) of previously unconsolidated joint ventures |  | — |  |  |  | — |  |  |  | 42.8 |
Net assets acquired from unconsolidated joint ventures |  | — |  |  |  | — |  |  |  | 8.5 |
Dividends declared, but not paid |  | — |  |  |  | 63.8 |  |  |  | 30.4 |
Accounts payable related to construction in progress |  | 0.7 |  |  |  | 7.0 |  |  |  | 12.2 |
Accrued liabilities for sold properties |  | — |  |  |  | 5.4 |  |  |  | — |
Repurchase of operating partnership units |  | — |  |  |  | 4.1 |  |  |  | — |
Estimated Useful Lives of Assets | Depreciation and amortization is recorded on a straight-line basis over the estimated useful lives of the assets as follows:
Buildings | Useful lives, ranging from 30 to 40 years
Building improvements and fixtures | Useful lives, ranging from 3 to 20 years
Tenant improvements | Shorter of economic life or lease terms
Schedule of Fee and Other Income | Revenues earned by the Company related to all of the Company’s unconsolidated joint ventures are as follows (in millions):
| For the Year Ended December 31, |
| 2024 |  |  | 2023 |  |  | 2022 |
Revenue from contracts: |  |  |  |  |  |  |  |
Asset and property management fees | $ | 5.1 |  |  | $ | 5.7 |  |  | $ | 7.7 |
Leasing commissions and development fees |  | 0.2 |  |  |  | 0.4 |  |  |  | 1.9 |
|  | 5.3 |  |  |  | 6.1 |  |  |  | 9.6 |
Other |  | 0.2 |  |  |  | 0.7 |  |  |  | 1.0 |
| $ | 5.5 |  |  | $ | 6.8 |  |  | $ | 10.6 |
Accounting Standards Update 2023-07 [Member] |
Schedule of Fee and Other Income | Revenue from contracts with customers and other property-related income is recognized in the period earned as follows (in thousands):
| For the Year Ended December 31, |
| 2024 |  |  | 2023 |  |  | 2022 |
Revenue from contracts: |  |  |  |  |  |  |  |
Asset and property management fees from joint ventures | $ | 5,150 |  |  | $ | 5,692 |  |  | $ | 7,845 |
Leasing commissions and development fees |  | 167 |  |  |  | 429 |  |  |  | 1,856 |
Shared services fee from Curbline |  | 723 |  |  |  | — |  |  |  | — |
Disposition, asset and property management fees from RVI |  | 100 |  |  |  | 150 |  |  |  | 859 |
Total revenue from contracts with customers |  | 6,140 |  |  |  | 6,271 |  |  |  | 10,560 |
Other property income |  | 2,041 |  |  |  | 2,282 |  |  |  | 4,406 |
Total fee and other income | $ | 8,181 |  |  | $ | 8,553 |  |  | $ | 14,966 |

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