Summary of Significant Accounting Policies	6 Months Ended
Jun. 30, 2026
Summary Of Significant Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) and certain reclassifications considered necessary for a fair presentation have been included. Operating results for the six months ended June 30, 2026 are not necessarily indicative of the results that may be expected for the year ending December 31, 2026. In preparation of the Company’s financial statements in conformity with GAAP, management makes estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements as well as the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates. The balance sheets at December 31, 2025 have been derived from the audited financial statements at that date but do not include all of the information and footnotes required by GAAP for complete financial statements. For further information, including definitions of capitalized terms not defined herein, refer to the consolidated financial statements and footnotes thereto included in the Company’s and the Operating Partnership’s Annual Report on Form 10-K for the year ended December 31, 2025. Income and Other Taxes EQR has elected to be taxed as a REIT. This, along with the nature of the operations of its operating properties, resulted in no provision for federal income taxes at the EQR level. In addition, ERPOP generally is not liable for federal income taxes as the partners recognize their allocable share of income or loss in their tax returns; therefore no provision for federal income taxes has been made at the ERPOP level. Historically, the Company has generally only incurred certain state and local income, excise and franchise taxes. The Company has elected taxable REIT subsidiary (“TRS”) status for certain of its corporate subsidiaries and, as a result, these entities will incur both federal and state income taxes on any taxable income of such entities after consideration of any net operating losses. Recent Accounting Pronouncements In December 2025, the Financial Accounting Standards Board (“FASB”) issued an amendment to the interim reporting standards which is intended to improve the navigability of the required interim reporting disclosures and clarify when that guidance is applicable. The update provides a comprehensive list of interim disclosures required under GAAP and incorporates a disclosure principle that requires disclosures at interim periods when an event or change that has a material effect on an entity has occurred since the previous year end. The standard will be effective for interim reporting periods within annual reporting periods beginning after December 15, 2027, with early adoption permitted, and may be applied either prospectively or retrospectively. The Company is currently evaluating the impact of the new rules on its disclosures. In November 2024, the FASB issued a new standard on disaggregation of income statement expenses, which requires an entity to disclose, on an annual and interim basis, disaggregated information about certain income statement expense line items in a tabular format in the notes to the financial statements. The standard will be effective for annual reporting periods beginning after December 15, 2026 and for interim reporting periods within annual reporting periods beginning after December 15, 2027, with early adoption permitted, and may be applied either prospectively or retrospectively. The Company is currently evaluating the impact of the new rules on its disclosures. In December 2023, the FASB issued an amendment to the income tax standards which requires disclosure enhancements and further transparency to certain income tax disclosures, most notably the tax rate reconciliation and income taxes paid. The Company adopted the standard when effective for annual periods beginning January 1, 2025 on a prospective basis. Due to the nature of the Company's operations and the immaterial amount of income taxes incurred/paid due to its status as a REIT, adoption of the standard had no impact on its disclosures. See the Income and Other Taxes section above for additional discussion. In November 2023, the FASB issued an amendment to the segment reporting standards which requires disclosure for each reportable segment, on an interim and annual basis, of the significant expense categories and amounts that are regularly provided to the chief operating decision maker and included in each reported measure of a segment’s profit or loss. Additionally, it requires disclosure of the title and position of the individual or the name of the group or committee identified as the chief operating decision maker. The Company adopted the standard when effective for annual periods beginning January 1, 2024 and interim periods beginning January 1, 2025 on a retrospective basis. See Note 12 for further discussion.

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) and certain reclassifications considered necessary for a fair presentation have been included. Operating results for the six months ended June 30, 2026 are not necessarily indicative of the results that may be expected for the year ending December 31, 2026.

In preparation of the Company’s financial statements in conformity with GAAP, management makes estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements as well as the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates.

The balance sheets at December 31, 2025 have been derived from the audited financial statements at that date but do not include all of the information and footnotes required by GAAP for complete financial statements.

For further information, including definitions of capitalized terms not defined herein, refer to the consolidated financial statements and footnotes thereto included in the Company’s and the Operating Partnership’s Annual Report on Form 10-K for the year ended December 31, 2025.

Income and Other Taxes

EQR has elected to be taxed as a REIT. This, along with the nature of the operations of its operating properties, resulted in no provision for federal income taxes at the EQR level. In addition, ERPOP generally is not liable for federal income taxes as the partners recognize their allocable share of income or loss in their tax returns; therefore no provision for federal income taxes has been made at the ERPOP level. Historically, the Company has generally only incurred certain state and local income, excise and franchise taxes. The Company has elected taxable REIT subsidiary (“TRS”) status for certain of its corporate subsidiaries and, as a result, these entities will incur both federal and state income taxes on any taxable income of such entities after consideration of any net operating losses.

Recent Accounting Pronouncements

In December 2025, the Financial Accounting Standards Board (“FASB”) issued an amendment to the interim reporting standards which is intended to improve the navigability of the required interim reporting disclosures and clarify when that guidance is applicable. The update provides a comprehensive list of interim disclosures required under GAAP and incorporates a disclosure principle that requires disclosures at interim periods when an event or change that has a material effect on an entity has occurred since the previous year end. The standard will be effective for interim reporting periods within annual reporting periods beginning after December 15, 2027, with early adoption permitted, and may be applied either prospectively or retrospectively. The Company is currently evaluating the impact of the new rules on its disclosures.

In November 2024, the FASB issued a new standard on disaggregation of income statement expenses, which requires an entity to disclose, on an annual and interim basis, disaggregated information about certain income statement expense line items in a tabular format in the notes to the financial statements. The standard will be effective for annual reporting periods beginning after December 15, 2026 and for interim reporting periods within annual reporting periods beginning after December 15, 2027, with early adoption permitted, and may be applied either prospectively or retrospectively. The Company is currently evaluating the impact of the new rules on its disclosures.

In December 2023, the FASB issued an amendment to the income tax standards which requires disclosure enhancements and further transparency to certain income tax disclosures, most notably the tax rate reconciliation and income taxes paid. The Company adopted the standard when effective for annual periods beginning January 1, 2025 on a prospective basis. Due to the nature of the Company's operations and the immaterial amount of income taxes incurred/paid due to its status as a REIT, adoption of the standard had no impact on its disclosures. See the Income and Other Taxes section above for additional discussion.

In November 2023, the FASB issued an amendment to the segment reporting standards which requires disclosure for each reportable segment, on an interim and annual basis, of the significant expense categories and amounts that are regularly provided to the chief operating decision maker and included in each reported measure of a segment’s profit or loss. Additionally, it requires disclosure of the title and position of the individual or the name of the group or committee identified as the chief operating decision maker. The Company adopted the standard when effective for annual periods beginning January 1, 2024 and interim periods beginning January 1, 2025 on a retrospective basis. See Note 12 for further discussion.