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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 KwYBZIJuegzaTyVSpx6d/K+GqQydV9uNBZ3c6U/bMLs8cb8Vj4onzgscVgJ0u0Nl
 Hhb2ASNYQ01fy/tWp9DNYQ==

<SEC-DOCUMENT>0000908737-03-000469.txt : 20031027
<SEC-HEADER>0000908737-03-000469.hdr.sgml : 20031027
<ACCEPTANCE-DATETIME>20031027113518
ACCESSION NUMBER:		0000908737-03-000469
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20031027
FILED AS OF DATE:		20031027

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			ZEYTOONJIAN FREDERICK N
		CENTRAL INDEX KEY:			0001244456

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-15319
		FILM NUMBER:		03957795

	BUSINESS ADDRESS:	
		STREET 1:		REIT MANAGEMENT & RESEARCH LLC
		STREET 2:		400 CENTRE STREET
		CITY:			NEWTON
		STATE:			MA
		ZIP:			02458

ISSUER:		

	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

	BUSINESS ADDRESS:	
		STREET 1:		400 CENTRE STREET
		CITY:			NEWTON
		STATE:			MA
		ZIP:			02458
		BUSINESS PHONE:		6173323990
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>form3fzeytoonjian_oct2703ex.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<!-- - EDGAR Ease Plus 1.0                                   07/25/03  TT    -->
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>3</documentType>
   <periodOfReport>2003-10-27</periodOfReport>
    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001075415</issuerCik>
        <issuerName>SENIOR HOUSING PROPERTIES TRUST</issuerName>
        <issuerTradingSymbol>SNH</issuerTradingSymbol>
   </issuer>
   <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001244456</rptOwnerCik>
            <rptOwnerName>ZEYTOONJIAN FREDERICK N</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>REIT MANAGEMENT &amp; RESEARCH LLC</rptOwnerStreet1>
            <rptOwnerStreet2>400 CENTRE STREET</rptOwnerStreet2>
            <rptOwnerCity>NEWTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02458</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
         <isDirector>1</isDirector>
         <isOfficer>0</isOfficer>
         <isTenPercentOwner>0</isTenPercentOwner>
         <isOther>0</isOther>
      </reportingOwnerRelationship>
   </reportingOwner>
 <nonDerivativeTable>
   <nonDerivativeHolding>
      <securityTitle>
         <value>Common Stock</value>
      </securityTitle>
      <postTransactionAmounts>
         <sharesOwnedFollowingTransaction>
           <value>0</value>
         </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
         <directOrIndirectOwnership>
            <value>D</value>
         </directOrIndirectOwnership>
      </ownershipNature>
   </nonDerivativeHolding>
 </nonDerivativeTable>
   <ownerSignature>
      <signatureName>/s/ Frederick N. Zeytoonjian</signatureName>
      <signatureDate>2003-10-27</signatureDate>
   </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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