SENIOR HOUSING PROPERTIES TRUST 4,200,000 Shares of Beneficial Interest ($0.01 par value per Share) UNDERWRITING AGREEMENTUnderwriting Agreement • December 2nd, 2005 • Senior Housing Properties Trust • Real estate investment trusts • New York
Contract Type FiledDecember 2nd, 2005 Company Industry JurisdictionThis Lock-Up Letter Agreement is being delivered to you in connection with the proposed Underwriting Agreement (the “Underwriting Agreement”) to be entered into among Senior Housing Properties Trust (the “Company”), HRPT Properties Trust (the “Selling Stockholder”) and you, as Underwriters, with respect to the public offering (the “Offering”) of up to 5,000,000 common shares of beneficial interest of the Company (the “Common Shares”).