X0303 4 2011-03-30 0 0001075415 SENIOR HOUSING PROPERTIES TRUST NYSE: SNH 0001241559 PORTNOY BARRY M NEWTON MA 02458 1 0 0 0 Common Shares of Beneficial Interest 2011-03-30 5 J 0 E 4916 23.02 A 185154.802 D These shares were issued pursuant to a business management agreement between the issuer and Reit Management & Research LLC ("RMR") of which Mr. Portnoy is a director and majority beneficial owner. Mr. Portnoy purchased these shares from RMR upon their issuance. Such transfers were exempt from Section 16 of the Securities Exchange Act of 1934, as amended, pursuant to Rule 16a-13 thereunder. In accordance with the business management agreement referred to above, certain historical share price information was used to determine the number of common shares of beneficial interest paid to RMR. The per share price amount listed above is the closing sale price of the issuer's common shares of beneficial interest on the New York Stock Exchange on March 30, 2011, when the shares were issued and purchased. Includes 2,935.602 shares acquired under the Senior Housing Properties Trust Dividend Reinvestment Plan since the last Section 16 filing by Mr. Portnoy. /s/ Barry M. Portnoy 2011-03-30