AvalonBay Communities, Inc.
This opinion letter is delivered to you in connection with the registration statement on Form S-4 (File No. 333-297128), including the joint proxy statement/prospectus contained therein at the time the Registration
Statement (as defined below) is declared effective, initially filed with the Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933, as amended (the “Securities Act”), on June 29, 2026, as amended by Amendment No. 1 thereto filed with the Commission on the date hereof (as amended, excluding the documents incorporated by reference therein, the “Registration
Statement”), in respect of the proposed merger of AvalonBay Communities, Inc., a Maryland corporation (the “Company”), with and into Canopy Merger Sub LLC, a Maryland limited liability company (“Merger Sub”), pursuant to the Agreement and Plan of Merger, dated as of May 20, 2026 (the “Merger Agreement”), by and among Equity Residential, a Maryland real estate
investment trust (“Parent”), Merger Sub, ERP Operating Limited Partnership, an Illinois limited partnership (“Parent OP”), and the Company. The opinion herein relates
to the accuracy of the discussion set forth in the section entitled “MATERIAL U.S. FEDERAL INCOME TAX CONSEQUENCES OF THE MERGER” in the Registration Statement. Capitalized terms not defined herein shall have the meanings ascribed to such terms
in the Merger Agreement.
For purposes of the opinion set forth below, we have reviewed and relied upon, without independent investigation thereof, the Merger Agreement and the Registration Statement.
We also have assumed the genuineness of all signatures, the authenticity of all documents submitted to us as originals, the conformity to the original documents of all documents submitted to us as copies, the
authority and capacity of the individual or individuals who executed any such documents on behalf of any person, the conformity to the final documents of all documents submitted to us as drafts and the accuracy and completeness of all records
made available to us.
Based upon and subject to the exceptions, limitations, assumptions and qualifications set forth herein and/or described in the Registration Statement, it is our opinion that the discussion set forth in the
section entitled “MATERIAL U.S. FEDERAL INCOME TAX CONSEQUENCES OF THE MERGER” in the Registration Statement, insofar as it summarizes United States federal income tax law, is accurate in all material respects.
We express no opinion herein other than the opinion expressly set forth above.
The opinion set forth in this letter is based on relevant current provisions of the Internal Revenue Code of 1986, as amended, and the Treasury Regulations thereunder (including proposed and temporary
Treasury Regulations), and interpretations of the foregoing as expressed in court decisions, applicable legislative history, and the administrative rulings and practices of the Internal Revenue Service (the “IRS”), all as of the date hereof and all of which are subject to change (possibly with retroactive effect). Changes in applicable law could adversely affect our opinion. We do not undertake to advise you as to any
changes in applicable law after the date hereof that may affect our opinion.