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Summary of Significant Accounting Policies (Tables)

12 Months Ended

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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