American Assets Trust, Inc. (NYSE:AAT) (the “Company”) today announced the completion of its initial public offering of 27,500,000 shares of its common stock priced at $20.50 per share. The Company also announced today that the underwriters of its initial public offering exercised in full their option to purchase an additional 4,125,000 shares of its common stock priced at $20.50 per share. The sale of the additional 4,125,000 shares was also completed today. All shares are being offered by the Company. BofA Merrill Lynch, Wells Fargo Securities and Morgan Stanley are the joint book-running managers for the offering. The co-managers of the offering are KeyBanc Capital Markets, RBC Capital Markets, Piper Jaffray, PNC Capital Markets LLC and JMP Securities. A registration statement relating to these securities has been declared effective by the Securities and Exchange Commission. This press release shall not constitute an offer to sell or the solicitation of an offer to buy any of the offered securities, nor shall there be any sale of these securities in any state or other jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or other jurisdiction. The offering of these securities is being made only by means of a prospectus. A copy of the final prospectus related to the offering was filed with the Securities and Exchange Commission and may be obtained by contacting any of the book-running managers: BofA Merrill LynchAttention: Prospectus Department4 World Financial CenterNew York, NY 10080or by email at email@example.com Wells Fargo SecuritiesAttention: Equity Syndicate Department375 Park AvenueNew York, NY 10152or by email at firstname.lastname@example.org Morgan Stanley & Co. IncorporatedAttention: Prospectus Department180 Varick StreetNew York, NY 10014or by email at email@example.comAbout American Assets Trust, Inc. American Assets Trust, Inc. is a full service, vertically integrated and self-administered real estate investment trust, or REIT, that owns, operates, acquires and develops high quality retail and office properties in attractive, high-barrier-to-entry markets primarily in Southern California, Northern California and Hawaii. The Company was formed to succeed to the real estate business of American Assets, Inc., a privately held corporation founded in 1967 and, as such, has significant experience, long-standing relationships and extensive knowledge of its core markets, submarkets and asset classes. The Company’s retail portfolio comprises approximately 3.0 million rentable square feet, and its office portfolio comprises approximately 1.5 million square feet. In addition the company owns one mixed-use property (including approximately 97,000 rentable square feet of retail space and a 369-room all-suite hotel) and over 900 multifamily units. The Company intends to elect to be treated as a real estate investment trust, or REIT, for U.S. federal income tax purposes, commencing with the taxable year ending December 31, 2011.