    <SEC-DOCUMENT>0001104659-18-032738-index.html : 20180514
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    <ACCEPTANCE-DATETIME>20180514084143
    ACCESSION NUMBER:		0001104659-18-032738
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		18
    CONFORMED PERIOD OF REPORT:	20180514
    ITEM INFORMATION:		Regulation FD Disclosure
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20180514
    DATE AS OF CHANGE:		20180514

    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:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-15319
    		FILM NUMBER:		18828792

    	BUSINESS ADDRESS:
    		STREET 1:		C/O THE RMR GROUP
    		STREET 2:		TWO NEWTON PL., 255 WASH. ST., STE. 300
    		CITY:			NEWTON
    		STATE:			MA
    		ZIP:			02458
    		BUSINESS PHONE:		(617) 796-8350

    	MAIL ADDRESS:
    		STREET 1:		C/O THE RMR GROUP
    		STREET 2:		TWO NEWTON PL., 255 WASH. ST., STE. 300
    		CITY:			NEWTON
    		STATE:			MA
    		ZIP:			02458
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>a18-13480_18k.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: a18-13480_18k.htm

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    <SEQUENCE>2
    <FILENAME>a18-13480_1ex99d1.htm
    <DESCRIPTION>EX-99.1
    <TEXT>
    Document 2 - file: a18-13480_1ex99d1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>g134771mmi001.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: g134771mmi001.gif

    </DOCUMENT>
    <DOCUMENT>
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    <SEQUENCE>4
    <FILENAME>g134771mmi002.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: g134771mmi002.gif

    </DOCUMENT>
    <DOCUMENT>
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    <SEQUENCE>5
    <FILENAME>g134771mmi003.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: g134771mmi003.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>g134771mmi004.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: g134771mmi004.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>g134771mmi005.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: g134771mmi005.gif

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    <DOCUMENT>
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    <SEQUENCE>8
    <FILENAME>g134771mmi006.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: g134771mmi006.gif

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    <DOCUMENT>
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    <SEQUENCE>9
    <FILENAME>g134771mmi007.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: g134771mmi007.gif

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    <DOCUMENT>
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    <SEQUENCE>10
    <FILENAME>g134771mmi008.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: g134771mmi008.gif

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>g134771mmi009.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: g134771mmi009.gif

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    <DOCUMENT>
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    <SEQUENCE>12
    <FILENAME>g134771mmi010.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: g134771mmi010.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>g134771mmi011.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: g134771mmi011.gif

    </DOCUMENT>
    <DOCUMENT>
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    <SEQUENCE>14
    <FILENAME>g134771mmi012.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: g134771mmi012.gif

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    <DOCUMENT>
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    <SEQUENCE>15
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    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: g134771mmi013.gif

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    <DOCUMENT>
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    <SEQUENCE>16
    <FILENAME>g134771mmi014.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 16 - file: g134771mmi014.gif

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    <SEQUENCE>17
    <FILENAME>g134771mmi015.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 17 - file: g134771mmi015.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>g134771mmi016.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 18 - file: g134771mmi016.gif

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