-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0001201901-04-000001.txt : 20040805
<SEC-HEADER>0001201901-04-000001.hdr.sgml : 20040805
<ACCEPTANCE-DATETIME>20040805164018
ACCESSION NUMBER:		0001201901-04-000001
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20040520
FILED AS OF DATE:		20040805

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			THOMPSON WILLIAM S
		CENTRAL INDEX KEY:			0001201901

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	811-07816
		FILM NUMBER:		04955164

	MAIL ADDRESS:	
		STREET 1:		1345 AVENUE OF AMERICAS
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10105

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
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2004-05-20</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001201901</rptOwnerCik>
            <rptOwnerName>THOMPSON WILLIAM S</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>840 NEWPORT CENTER DRIVE, SUITE 100</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEWPORT BEACH</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92660</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Executive Committee</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

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            <transactionDate>
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            <transactionTimeliness>
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            <transactionAmounts>
                <transactionShares>
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                </transactionShares>
                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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        <derivativeTransaction>
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            <transactionDate>
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                <transactionFormType>4</transactionFormType>
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            <transactionTimeliness>
                <value></value>
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            <transactionAmounts>
                <transactionShares>
                    <value>2500</value>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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                <directOrIndirectOwnership>
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            <transactionDate>
                <value>2004-05-21</value>
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                <transactionFormType>4</transactionFormType>
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            <transactionTimeliness>
                <value></value>
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            <transactionAmounts>
                <transactionShares>
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                <transactionPricePerShare>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
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                <directOrIndirectOwnership>
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                <transactionPricePerShare>
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                    <value>D</value>
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                <footnoteId id="F2"/>
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            <underlyingSecurity>
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                <underlyingSecurityShares>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
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                    <footnoteId id="F2"/>
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                <footnoteId id="F1"/>
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                <footnoteId id="F2"/>
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                <value>2004-05-21</value>
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                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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                <transactionPricePerShare>
                    <value>12.32</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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                <footnoteId id="F2"/>
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                <footnoteId id="F2"/>
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                </underlyingSecurityTitle>
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                    <value>500</value>
                </underlyingSecurityShares>
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                    <value>I</value>
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                <natureOfOwnership>
                    <value>Compensation Deferral Account</value>
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        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">A rabbi trust established in connection with the Executive Deferred Compensation Plan of Allianz Dresdner Asset Management of America LLC acquired common shares of the Issuer for the Compensation Deferral Account maintained for the benefit of Mr. Thompson.  The shares are held in the name of the Plan.</footnote>
        <footnote id="F2">Mr. Thompson will receive in cash the value of the shares at the time he is eligible to receive benefits under the Plan unless he instucts the rabbi trust to sell the shares at an earlier date and allocate the proceeds of the sale to a different investment.  Mr. Thompson is not eligible to receive the benefits under the Plan until five years after the plan year in which the contribution was made to his account, or such later date beyond five years as Mr. Thompson elects.</footnote>
    </footnotes>

    <remarks>Pacific Investment Management Company LLC (PIMCO) is the investment adviser of the Issuer.  Mr. Thompson is a member of PIMCO's Executive Committee.</remarks>

    <ownerSignature>
        <signatureName>Brian S. Shlissel, Attorney in fact for William S. Thompson</signatureName>
        <signatureDate>2004-08-05</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----
