EXHIBIT 8.1 May 12, 2000 AMB Property Corporation 505 Montgomery Street San Francisco, California 94111 Re: AMB Property Corporation Registration Statement on Form S-3 Ladies and Gentlemen: We have acted as special counsel to AMB Property Corporation, a Maryland corporation (the "Company"), in connection with the registration statement on Form S-3 being filed by the Company on the date hereof with the Securities and Exchange Commission in connection with the registration, under the Securities Act of 1933, as amended, of 604,433 shares of the Company's common stock, par value $.01 per share (together with all exhibits thereto and documents incorporated by reference therein, the "Registration Statement"). This opinion is based on various facts and assumptions, including the facts set forth in the Registration Statement, concerning the business, properties, and governing documents of the Company and its subsidiaries. We have also been furnished with, and with your consent have relied upon, certain representations made by the Company with respect to factual matters through a certificate of an officer of the Company (the "Officer's Certificate"). We have made such legal and factual examinations and inquiries, including an examination of originals or copies certified or otherwise identified to our satisfaction of such documents, corporate records and other instruments, as we have deemed necessary or appropriate for purposes of this opinion. We have assumed the authenticity of all documents submitted to us as originals, the genuineness of all signatures thereon, the legal capacity of natural persons executing such documents and the conformity to authentic original documents of all documents submitted to us as copies. We are opining herein as to the effect on the subject transaction only of the federal income tax laws of the United States, and we express no opinion with respect to the applicability thereto, or the effect thereon, of other federal laws, the laws of any state or other jurisdiction or as to any matters of municipal law or the laws of any other local agencies with any state. Based upon such facts, assumptions, and representations, including the facts set forth in the Registration Statement and the Officer's Certificate, it is our opinion that the information in the Registration Statement set forth under the caption "FEDERAL INCOME TAX CONSIDERATIONS," to the extent that it constitutes matters of law, summaries of legal matters, documents or proceedings, or legal conclusions, is correct in all material respects. No opinion is expressed as to any matter not discussed herein. This opinion is only being rendered to you as of the date of this letter, and we undertake no obligation to update this opinion subsequent to the date hereof. This opinion is based on various statutory provisions, regulations promulgated thereunder and interpretations thereof by the Internal Revenue Service and the courts having jurisdiction over such matters, all of which are subject to change either prospectively or retroactively. Also, any variation or difference in the facts from those set forth in the Registration Statement or the Officer's Certificate may affect the conclusions stated herein. AMB Property Corporation May 12, 2000 Page 2 This opinion is rendered to you and is solely for your benefit in connection with the Registration Statement. We hereby consent to the filing of this opinion as an exhibit to the Registration Statement. This opinion may not be relied upon by you for any other purpose, or furnished to, quoted to or relied upon by any other person, firm or corporation for any purpose, without our prior written consent. Very truly yours, /s/ Latham & Watkins 2