Basis of Presentation and Organization	6 Months Ended
Jun. 30, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Organization	Basis of Presentation and Organization Basis of Presentation The accompanying condensed consolidated financial statements include the accounts of Apartment Income REIT, L.P. (“AIR Operating Partnership” or the “Operating Partnership”), and its consolidated subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation. The AIR Operating Partnership is managed by its general partner, AIR-GP LLC, a Delaware limited liability company (the "General Partner"). "Special Limited Partner" is defined collectively as Apartment Income REIT LLC, AIR REIT Sub 1, LLC, and AIR REIT Sub 2, LLC, each of which is a Delaware limited liability company and holds a limited partner interest in the Operating Partnership. As used herein, except where the context otherwise requires, “partnership” refers to a limited partnership or a limited liability company and “partner” refers to a partner in a limited partnership or a member of a limited liability company. Interests in partnerships consolidated by AIR Operating Partnership that are held by third parties are reflected in AIR Operating Partnership’s accompanying condensed consolidated balance sheets as noncontrolling interests in consolidated real estate partnerships. Net income (loss) and other comprehensive income (loss) are allocated to each partner's capital (deficit) account. Except as the context otherwise requires, “we,” “our,” and “us” refer to AIR Operating Partnership and its consolidated subsidiaries, collectively. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted in accordance with such rules and regulations, although management believes the disclosures are adequate to prevent the information presented from being misleading. In the opinion of management, all adjustments, consisting of normal recurring items, considered necessary for a fair presentation have been included. Operating results for the three and six months ended June 30, 2026, are not necessarily indicative of the results that may be expected for the year ending December 31, 2026. The condensed consolidated balance sheet of AIR Operating Partnership and its consolidated subsidiaries as of December 31, 2025, has been derived from its audited financial statements at that date, but do not include all of the information and disclosures required by GAAP for complete financial statements. For further information, refer to the financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2025. Reclassifications Certain prior period balances have been combined with or reclassified within the condensed consolidated statements of cash flows to conform to current period presentation pursuant to Rule 10-01(a)(2) of Regulation S-X. Income tax expense and Loss on extinguishment of debt have been combined with Other, net, and (Income) loss from unconsolidated real estate partnerships has been reclassified out of Other, net. These changes have no impact on Net cash provided by operating activities previously reported. Organization and Business We focus on the ownership of stabilized multi-family properties located in top markets, including eight important geographic concentrations: Boston; Philadelphia; Washington, D.C.; Miami; Denver; the San Francisco Bay Area; Los Angeles; and San Diego. We own and operate a portfolio of stabilized apartment communities, diversified by both geography and price point, in nine states and the District of Columbia. As of June 30, 2026, our portfolio included 67 apartment communities with 24,649 apartment homes, in which we held an average ownership of approximately 83%. Interests held by the General Partner and Special Limited Partner, and other limited partners in the AIR Operating Partnership are referred to as OP Units. OP Units include common partnership units (inclusive of Class I High Performance Partnership Units), which we refer to as “common OP Units,” as well as preferred partnership units, which we refer to as “preferred OP Units.” As of June 30, 2026, after elimination of units held by consolidated subsidiaries, the AIR Operating Partnership had 153,581,049 common OP Units and equivalents legally outstanding.

The accompanying condensed consolidated financial statements include the accounts of Apartment Income REIT, L.P. (“AIR Operating Partnership” or the “Operating Partnership”), and its consolidated subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.

The AIR Operating Partnership is managed by its general partner, AIR-GP LLC, a Delaware limited liability company (the "General Partner"). "Special Limited Partner" is defined collectively as Apartment Income REIT LLC, AIR REIT Sub 1, LLC, and AIR REIT Sub 2, LLC, each of which is a Delaware limited liability company and holds a limited partner interest in the Operating Partnership.

As used herein, except where the context otherwise requires, “partnership” refers to a limited partnership or a limited liability company and “partner” refers to a partner in a limited partnership or a member of a limited liability company. Interests in partnerships consolidated by AIR Operating Partnership that are held by third parties are reflected in AIR Operating Partnership’s accompanying condensed consolidated balance sheets as noncontrolling interests in consolidated real estate partnerships. Net income (loss) and other comprehensive income (loss) are allocated to each partner's capital (deficit) account.

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted in accordance with such rules and regulations, although management believes the disclosures are adequate to prevent the information presented from being misleading. In the opinion of management, all adjustments, consisting of normal recurring items, considered necessary for a fair presentation have been included. Operating results for the three and six months ended June 30, 2026, are not necessarily indicative of the results that may be expected for the year ending December 31, 2026.

The condensed consolidated balance sheet of AIR Operating Partnership and its consolidated subsidiaries as of December 31, 2025, has been derived from its audited financial statements at that date, but do not include all of the information and disclosures required by GAAP for complete financial statements. For further information, refer to the financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2025.

Certain prior period balances have been combined with or reclassified within the condensed consolidated statements of cash flows to conform to current period presentation pursuant to Rule 10-01(a)(2) of Regulation S-X. Income tax expense and Loss on extinguishment of debt have been combined with Other, net, and (Income) loss from unconsolidated real estate partnerships has been reclassified out of Other, net. These changes have no impact on Net cash provided by operating activities previously reported.

We focus on the ownership of stabilized multi-family properties located in top markets, including eight important geographic concentrations: Boston; Philadelphia; Washington, D.C.; Miami; Denver; the San Francisco Bay Area; Los Angeles; and San Diego.

We own and operate a portfolio of stabilized apartment communities, diversified by both geography and price point, in nine states and the District of Columbia. As of June 30, 2026, our portfolio included 67 apartment communities with 24,649 apartment homes, in which we held an average ownership of approximately 83%.

Interests held by the General Partner and Special Limited Partner, and other limited partners in the AIR Operating Partnership are referred to as OP Units. OP Units include common partnership units (inclusive of Class I High Performance Partnership Units), which we refer to as “common OP Units,” as well as preferred partnership units, which we refer to as “preferred OP Units.” As of June 30, 2026, after elimination of units held by consolidated subsidiaries, the AIR Operating Partnership had 153,581,049 common OP Units and equivalents legally outstanding.