    <SEC-DOCUMENT>0001104659-15-032305-index.html : 20150430
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    <ACCEPTANCE-DATETIME>20150430135831
    ACCESSION NUMBER:		0001104659-15-032305
    CONFORMED SUBMISSION TYPE:	DEFA14A
    PUBLIC DOCUMENT COUNT:		5
    FILED AS OF DATE:		20150430
    DATE AS OF CHANGE:		20150430
    EFFECTIVENESS DATE:		20150430

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			SENIOR HOUSING PROPERTIES TRUST
    		CENTRAL INDEX KEY:			0001075415
    		STANDARD INDUSTRIAL CLASSIFICATION:	REAL ESTATE INVESTMENT TRUSTS [6798]
    		IRS NUMBER:				043445278
    		STATE OF INCORPORATION:			MD
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEFA14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-15319
    		FILM NUMBER:		15817206

    	BUSINESS ADDRESS:
    		STREET 1:		TWO NEWTON PLACE
    		STREET 2:		255 WASHINGTON STREET
    		CITY:			NEWTON
    		STATE:			MA
    		ZIP:			02458
    		BUSINESS PHONE:		6173323990

    	MAIL ADDRESS:
    		STREET 1:		TWO NEWTON PLACE
    		STREET 2:		255 WASHINGTON STREET
    		CITY:			NEWTON
    		STATE:			MA
    		ZIP:			02458
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEFA14A
    <SEQUENCE>1
    <FILENAME>a15-10291_1defa14a.htm
    <DESCRIPTION>DEFA14A
    <TEXT>
    Document 1 - file: a15-10291_1defa14a.htm

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    <SEQUENCE>2
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    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: g102911bei001.gif

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>g102911bci001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: g102911bci001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>g102911bgi001.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: g102911bgi001.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>g102911bgi002.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: g102911bgi002.gif

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    </SEC-DOCUMENT>