American Campus Communities (ACC) 8-K American Campus Communities, Inc. Reports Fourth Quarter and Year End 2007 Financial Results

American Campus Communities GCT Acquisition Investor Presentation Addendum

GMH Proposed Portfolio Overview Wholly Owned Off-Campus Portfolio 2

GMH Proposed Portfolio Overview Disposition & Joint Venture Properties 3

GMH Proposed Portfolio Overview Joint Venture Properties Continued 4

Forward Looking Statements This addendum contains forward-looking statements, which express the current beliefs and expectations of management. Except for historical information, the matters discussed in this news release are forward-looking statements and can be identified by the use of the words "anticipate," "believe," "expect," "intend," "may," "might," "plan," "estimate," "project," "should," "will," "result" and similar expressions. Such statements are based on current expectations and involve a number of known and unknown risks and uncertainties that could cause our future results, performance or achievements to differ significantly from the results, performance or achievements expressed or implied by such forward-looking statements. Our actual results could differ materially from those anticipated in these forward-looking statements as a result of various factors, including risks and uncertainties related to the proposed transactions (including but not limited to (i) the occurrence of any effect, event, development or change that could give rise to the termination of the definitive agreements, (ii) the inability to complete the proposed transactions, including in the case of the merger, due to the failure of GMH's shareholders to approve the merger, (iii) the failure of any party to satisfy the conditions to the closing of the transactions and (iv) the failure of ACC to obtain the necessary financing arrangements set forth in a commitment letter received in connection with the proposed merger), inherent in the national economy, the real estate industry in general, and in our specific markets; the effect of terrorism or the threat of terrorism; legislative or regulatory changes including changes to laws governing REITs; our dependence on key personnel whose continued service is not guaranteed; availability of qualified acquisition and development targets; availability of capital and financing; rising interest rates; rising insurance rates; impact of ad valorem and income taxation; changes in generally accepted accounting principals; and our continued ability to successfully lease and operate our properties. While we believe these forward-looking statements are based on reasonable assumptions, we can give no assurance that our expectations will be achieved. These forward-looking statements are made as of the date of this news release, and we undertake no obligation to update publicly or revise any forward-looking statement, whether as a result of new information, future developments or otherwise.

Additional Information about the Merger and Where to Find It This addendum does not constitute an offer of any securities for sale. In connection with the merger, American Campus Communities, Inc. ("ACC") intends to file with the SEC a registration statement on Form S-4, which will include a proxy statement/prospectus of GMH Communities Trust ("GMH") and ACC and other relevant materials in connection with the proposed transactions. Investors and security holders of ACC and GMH are urged to read the proxy statement/prospectus and the other relevant material when they become available because they will contain important information about ACC, GMH and the proposed transactions. The proxy statement/prospectus and other relevant materials (when they become available), and any and all documents filed by ACC or GMH with the SEC, may be obtained free of charge at the SEC's web site at www.sec.gov. Investors and security holders may obtain free copies of the documents filed with the SEC by ACC by directing a written request to American Campus Communities, Inc., 805 Las Cimas Parkway, Suite 400, Austin, Texas 78746 Attention: Investor Relations. In addition, investors and security holders may obtain free copies of the documents filed with the SEC by GMH Communities by directing a written request to GMH Communities Trust, 10 Campus Boulevard, Newtown Square, Pennsylvania 19073, Attention: Investor Relations. INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE PROXY STATEMENT/PROSPECTUS AND THE OTHER RELEVANT MATERIALS WHEN THEY BECOME AVAILABLE BEFORE MAKING ANY VOTING OR INVESTMENT DECISION WITH RESPECT TO THE PROPOSED TRANSACTIONS. ACC, GMH and their respective executive officers, directors and trustees may be deemed to be participants in the solicitation of proxies from the security holders of GMH in connection with the merger. Information about those executive officers and directors of ACC and their ownership of ACC common stock is set forth in the proxy statement for ACC's 2007 Annual Meeting of Stockholders, which was filed with the SEC on March 29, 2007. Information about the executive officers and trustees of GMH and their ownership of GMH common shares is set forth in the proxy statement for GMH's 2007 Annual Meeting of Shareholders, which was filed with the SEC on May 8, 2007. Investors and security holders may obtain additional information regarding the direct and indirect interests of ACC, GMH and their respective executive officers, directors and trustees in the merger by reading the proxy statement and prospectus regarding the merger when they become available.