Capital - Stock and Publicly Traded Operating Partnership Unit Repurchase Program (Narrative) (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2025 USD ($) shares	Sep. 30, 2025 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchases of equity securities (in shares) \| shares	0
Treasury stock, value, acquired, cost method		$ 2,100,000
Weighted average price paid per share (in usd per share) \| $ / shares		$ 6.92
January 2024 Through December 2025 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase authorized amount	$ 500,000,000	$ 500,000,000
Maximum available for future purchase	$ 497,900,000	$ 497,900,000

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.

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+ Details

- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References + Details

Empire State Realty OP, L.P. 10-Q