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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,
 AEJ26Q3IF2VCF5wqcGa63XMRqJVWOhsZvJ2F9JrpWmly0Zn1iNjlE/4xsZ/2sQvB
 IMPZ5XaPkegdULpBgqBwow==

<SEC-DOCUMENT>0001309194-06-000008.txt : 20061002
<SEC-HEADER>0001309194-06-000008.hdr.sgml : 20061002
<ACCEPTANCE-DATETIME>20061002164443
ACCESSION NUMBER:		0001309194-06-000008
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20061001
FILED AS OF DATE:		20061002
DATE AS OF CHANGE:		20061002

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PIMCO COMMERCIAL MORTGAGE SECURITIES TRUST INC
		CENTRAL INDEX KEY:			0000908187
		IRS NUMBER:				521834031
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		840 NEWPORT CENTER DR
		STREET 2:		STE 360
		CITY:			NEWPORT BEACH
		STATE:			CA
		ZIP:			92660
		BUSINESS PHONE:		714-760-48

	MAIL ADDRESS:	
		STREET 1:		840 NEWPORT CENTER DR
		STREET 2:		STE 360
		CITY:			NEWPORT BEACH
		STATE:			CA
		ZIP:			92660

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Alexander Marilyn A
		CENTRAL INDEX KEY:			0001309194

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	811-07816
		FILM NUMBER:		061121158

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		312 466 3646

	MAIL ADDRESS:	
		STREET 1:		565 DUNNEGAN DRIVE
		CITY:			LAGUNA BEACH
		STATE:			CA
		ZIP:			92651
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2006-10-01</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000908187</issuerCik>
        <issuerName>PIMCO COMMERCIAL MORTGAGE SECURITIES TRUST INC</issuerName>
        <issuerTradingSymbol>PCM</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001309194</rptOwnerCik>
            <rptOwnerName>Alexander Marilyn A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>565 DUNNEGAN DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>LAGUNA BEACH</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92651</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <ownerSignature>
        <signatureName>Garlin G. Flynn</signatureName>
        <signatureDate>2006-10-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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