-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 TPlzoDO00rYU9PDrA2rf1gcIZERrwKcJgO7Hgsw3wF3/ZSLUApjyXwYZsAwNiYuK
 u7ADaA3lK3ZNU18vOlpXkg==

<SEC-DOCUMENT>0000015615-05-000013.txt : 20050111
<SEC-HEADER>0000015615-05-000013.hdr.sgml : 20050111
<ACCEPTANCE-DATETIME>20050111163212
ACCESSION NUMBER:		0000015615-05-000013
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20050103
FILED AS OF DATE:		20050111
DATE AS OF CHANGE:		20050111

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Floerke Gregory Scott
		CENTRAL INDEX KEY:			0001313785

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-08106
		FILM NUMBER:		05523782

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		305-406-1937

	MAIL ADDRESS:	
		STREET 1:		800 S DOUGLAS ROAD
		STREET 2:		12TH FLOOR
		CITY:			CORAL GABLES
		STATE:			FL
		ZIP:			33134

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MASTEC INC
		CENTRAL INDEX KEY:			0000015615
		STANDARD INDUSTRIAL CLASSIFICATION:	WATER, SEWER, PIPELINE, COMM AND POWER LINE CONSTRUCTION [1623]
		IRS NUMBER:				650829355
		STATE OF INCORPORATION:			FL
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		800 DOUGLAS ROAD
		STREET 2:		12TH FLOOR
		CITY:			CORAL GABLES
		STATE:			FL
		ZIP:			33134
		BUSINESS PHONE:		3055991800

	MAIL ADDRESS:	
		STREET 1:		800 DOUGLAS ROAD
		STREET 2:		12TH FLOOR
		CITY:			CORAL GABLES
		STATE:			FL
		ZIP:			33134

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BURNUP & SIMS INC
		DATE OF NAME CHANGE:	19920703
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>edgardoc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2005-01-03</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000015615</issuerCik>
        <issuerName>MASTEC INC</issuerName>
        <issuerTradingSymbol>MTZ</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001313785</rptOwnerCik>
            <rptOwnerName>Floerke Gregory Scott</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>800 S DOUGLAS ROAD</rptOwnerStreet1>
            <rptOwnerStreet2>12TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>CORAL GABLES</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>33134</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Operations Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Incentive Stock Option (right to buy)</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>9.73</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2015-01-03</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>10277</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Incentive Stock Option (right to buy)</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>14.97</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <value>2014-01-22</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>20040</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Non-Qualified Stock Option (right to buy)</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>5.15</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F4"/>
            </exerciseDate>
            <expirationDate>
                <value>2014-09-16</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>40000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Non-Qualified Stock Option (right to buy)</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>9.73</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2015-01-03</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>29723</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Non-Qualified Stock Option (right to buy)</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>14.97</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <value>2014-01-22</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>14960</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Stock Option granted pursuant to the 2003 Employee Incentive Plan for no cash consideration.</footnote>
        <footnote id="F2">Exempt stock option grant that vests over three years. First two years vesting is 33%. Third year vesting is 34%. Vesting begins twelve months after date of grant (01/03/2005).</footnote>
        <footnote id="F3">Exempt stock option grant that vests over three years. First two years vesting is 33%. Third year vesting is 34%. Vesting begins twelve months after date of grant (01-22-03).</footnote>
        <footnote id="F4">Exempt stock option grant that vests over three years. First two years vesting is 33%. Third year vesting is 34%. Vesting begins twelve months after date of grant (09/16/2004).</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>By: /s/ Michael G Nearing  For: Gregory S Floerke</signatureName>
        <signatureDate>2005-01-11</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>powerofattorney.txt
<DESCRIPTION>EDGAR SUPPORTING DOCUMENT
<TEXT>
POWER OF ATTORNEY
      KNOW ALL MEN BY THESE PRESENTS, that the
undersigned constitutes and appoints
Michael G. Nearing and Jose A. Llerena,
and each of them, the undersigned's true and lawful
attorneys-in-fact and agents,
with full power of substitution,
for the undersigned and in the
undersigned's name, place and stead,
in any and all capacities, to execute for and on behalf of the
undersigned, in the undersigned's capacity
as an officer and/or director of MasTec Inc. (the
"Company"), Forms 3, 4 and 5 in accordance
with Section 16(a) of the Securities Exchange Act of
1934, as amended, and the rules thereunder;
1.	do and perform any and all acts for
and on behalf of the undersigned which may be
necessary or desirable to complete and execute
any such Form 3, 4 or 5 and timely file
such form with the United States Securities
and Exchange Commission and any stock
exchange or similar authority; and
2.	take any other action of any type
whatsoever in connection with the foregoing which, in
the opinion of such attorney-in-fact,
may be of benefit to, in the best interest of, or
legally required by, the undersigned, it
being understood that the documents executed
by such attorney-in-fact on behalf of the
undersigned pursuant to this Power of Attorney
shall be in such form and shall contain
such terms and conditions as such attorney-in-
fact may approve in such attorney-in-fact's discretion.
      The undersigned hereby grants to each
such attorney-in-fact full power and authority to
do and perform any and every act and
thing whatsoever requisite, necessary, or proper to be
done in the exercise of any of
the rights and powers herein granted, as fully to all intents and
purposes as the undersigned might
or could do if personally present, with full power of
substitution or revocation, hereby
ratifying and confirming all that
such attorney-in-fact, or such
attorney-in-fact's substitute or
substitutes, shall lawfully do or
cause to be done by virtue of this
power of attorney and the rights and
powers herein granted.  The undersigned
acknowledges
that the foregoing attorneys-in-fact, in
serving in such capacity at the request of the
undersigned, are not assuming, nor is the
Company assuming, any of the undersigned's
responsibilities to comply with Section
16 of the Securities Exchange Act of 1934.
      This Power of Attorney shall
remain in full force and effect
until the undersigned is no
longer required to file Forms 3, 4 and 5
with respect to the undersigned's holdings of and
transactions in securities issued by the
Company, unless earlier revoked by the undersigned in
a signed writing delivered to the foregoing attorneys-in-fact.
      IN WITNESS WHEREOF, the undersigned
has caused this Power of Attorney to be
executed as of this 6th day of January, 2004.

/s/ Gregory S. Floerke
      Signature

      Gregory S Floerke



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