January 29, 1999



Edwin D. Johnson
Mastec Inc.
3155 NW 77th Ave
Miami, FL  33122


RE:    Amended Schedule 13G


Enclosed pursuant to Rule 13d-2(b) under the Securities Exchange
Act of 1934 is a report on Schedule 13G reporting beneficial
ownership at December 31, 1998 by American Express Company,
American Express Financial Corporation, and Growth Portfolio in
Common stock of Mastec Inc..


Sincerely,



Steve Turbenson
Director - External Reports and Tax




Enclosure


<PAGE>

                SECURITIES AND EXCHANGE COMMISSION

                      Washington, D. C. 20549

                           SCHEDULE 13G


           Under the Securities and Exchange Act of 1934



                            Mastec Inc.
- -------------------------------------------------------------------
                         (Name of Issuer)

                           Amendment #2

                           Common Stock
- -------------------------------------------------------------------
                  (Title of Class of Securities)



                            576323-10-9
- -------------------------------------------------------------------
                          (CUSIP Number)



 


The information required in the remainder of this cover page
(except any items to which the form provides a cross-reference)
shall not be deemed to be "filed" for the purpose of Section 18
of the Securities Exchange Act of 1934 ("Act") or otherwise
subject to the liabilities of that section of the Act but shall
be subject to all other provisions of the Act.



<PAGE>


                      CUSIP NO. 576323-10-9


1)  Name of Reporting Person          American Express Company

    S.S. or I.R.S. Identification     IRS No. 13-4922250
    No. of Above Person

- -------------------------------------------------------------------

2)  Check the Appropriate Box             (a)            
    if a Member of a Group                (b) X - Joint Filing 

- -------------------------------------------------------------------

3)  SEC Use Only

- -------------------------------------------------------------------

4)  Citizenship or Place of Organization   New York

 NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH
    (5)Sole Voting Power                  -0-       
    (6)Shared Voting Power                379,750     
    (7)Sole Dispositive Power             -0-       
    (8)Shared Dispositive Power           2,179,750 

- -------------------------------------------------------------------

9)  Aggregate Amount Beneficially
    Owned by Each Reporting Person        2,179,750

- -------------------------------------------------------------------

10) Check if the Aggregate Amount in
    Row (9) Excludes Certain Shares       Not Applicable

- -------------------------------------------------------------------

11) Percent of Class Represented by
    Amount In Row (9)                     7.9%

- -------------------------------------------------------------------

12) Type of Reporting Person              CO, HC

- -------------------------------------------------------------------


<PAGE>


                       CUSIP NO. 576323-10-9


1)  Name of Reporting Person          American Express Financial Corporation

    S.S. or I.R.S. Identification     IRS No. 13-3180631
    No. of Above Person

- -------------------------------------------------------------------

2)  Check the Appropriate Box             (a)            
    if a Member of a Group                (b) X - Joint Filing 

- -------------------------------------------------------------------

3)  SEC Use Only

- -------------------------------------------------------------------

4)  Citizenship or Place of Organization  Delaware

 NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH
    (5)Sole Voting Power                  -0-       
    (6)Shared Voting Power                379,750   
    (7)Sole Dispositive Power             -0-       
    (8)Shared Dispositive Power           2,179,750 
- -------------------------------------------------------------------

- -------------------------------------------------------------------

9)  Aggregate Amount Beneficially
    Owned by Each Reporting Person        2,179,750

- -------------------------------------------------------------------

10) Check if the Aggregate Amount in
    Row (9) Excludes Certain Shares       Not Applicable

- -------------------------------------------------------------------

11) Percent of Class Represented by
    Amount In Row (9)                     7.9%

- -------------------------------------------------------------------

12) Type of Reporting Person              CO, IA

- -------------------------------------------------------------------

<PAGE>


                      CUSIP NO 576323-10-9


1)  Name of Reporting Person              Growth Portfolio

    S.S. or I.R.S. Identification         IRS No. 41-1835535
    No. of Above Person

- -------------------------------------------------------------------

2)  Check the Appropriate Box             (a)            
    if a Member of a Group                (b) X - Joint Filing 

- -------------------------------------------------------------------

3)  SEC Use Only

- -------------------------------------------------------------------

4)  Citizenship or Place of Organization  Minnesota

- -------------------------------------------------------------------

          NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING
                            PERSON WITH
    (5)Sole Voting Power                  1,800,000 
    (6)Shared Voting Power                -0-       
    (7)Sole Dispositive Power             -0-       
    (8)Shared Dispositive Power           1,800,000 

- -------------------------------------------------------------------

9)  Aggregate Amount Beneficially
    Owned by Each Reporting Person        1,800,000

- -------------------------------------------------------------------

10) Check if the Aggregate Amount in
    Row (9) Excludes Certain Shares       Not Applicable

- -------------------------------------------------------------------

11) Percent of Class Represented by
    Amount In Row (9)                     6.5%

- -------------------------------------------------------------------

12) Type of Reporting Person              CO, IC

- -------------------------------------------------------------------

<PAGE>

1(a) Name of Issuer:                Mastec Inc.

1(b) Address of Issuer's Principal  3155 NW 77th Ave
     Executive Offices:             Miami, FL  33122

2(a) Name of Person Filing:         American Express Company
                                    American Express Financial Corporation
                                    Growth Portfolio
 
2(b) Address of Principal Business Office:
                                    American Express Company
                                    American Express Tower
                                    200 Vesey Street
                                    New York, NY  10285

                                    American Express Financial Corporation
                                    IDS Tower 10
                                    Minneapolis, MN  55440

                                    Growth Portfolio
                                    IDS Tower 10
                                    Minneapolis, MN  55440

 
2(c)  Citizenship:                  See Item 4 of Cover Page

2(d)  Title of Class of Securities: Common Stock

2(e)  Cusip Number:                 576323-10-9

3      Information if statement is filed pursuant to Rules 13d-1(b) or 13d-2(b):
         American Express Company, one of the persons filing this
         statement, is a Parent Holding Company in accordance with
         Rule 13d-1(b)(ii)(G).

         American Express Financial Corporation, one of the
         persons filing this statement, is an Investment Advisor
         registered under section 203 of the Investment Advisors
         Act of 1940.

         Growth Portfolio, one of the persons filing this
         statement, is an Investment Company registered under
         section 8 of the Investment Company Act.

4(a) Amount Beneficially Owned as of December 31, 1998:
     See Item 9 of Cover Pages

4(b) Percent of Class:    See Item 11 of Cover Pages

4(c) Number of Shares as to which such person has:
     (i)  Sole power to vote or to direct the vote: See Item 5 of Cover Pages
     (ii) Shared power to vote or direct the vote: See Item 6 of Cover Pages
     (iii)Sole power to dispose or to direct the disposition of:
     See Item 7 of Cover Pages
     (iv) Shared power to dispose or to direct the disposition of:
     See Item 8 of Cover Pages

5      Ownership of 5% or Less of a Class:
       If this statement is being filed to report the fact
       as of the date hereof the reporting person has ceased
       to be the beneficial owner of more than five percent
       of the class of securities, check the following  (  ).

<PAGE>

6      Ownership of more than 5% on Behalf of Another Person:

                              Not Applicable

7      Identification and Classification of the Subsidiary Which
       Acquired the Security Being Reported on by the Parent Holding Company:

                              See Exhibit I

8      Identification and Classification of Members of the Group:

                              Not Applicable

9      Notice of Dissolution of Group:

                              Not Applicable

10     Certification:

          By signing below I certify that, to the best of my
      knowledge and belief, the securities referred to above
      were acquired in the ordinary course of business and
      were not acquired for the purpose of and do not have
      the effect of changing or influencing the control of
      the issuer of such securities and were not acquired in
      connection with or as a participant in any transaction
      having such purposes or effect.

          After reasonable inquiry and to the best of my
      knowledge and belief, I certify that the information
      set forth in this statement is true, complete and
      correct.


                                    American Express Financial Corporation



Dated: December 31, 1998            By       ______________________
                                      Signature


                                      Steve Turbenson
                                      Director - External Reports 
                                      and Tax
                                      Name/Title

                                      Telephone: (612)  671-2059


<PAGE>

                           Exhibit Index


Exhibit I     Identification and Classification of the Subsidiary
              Which Acquired the Security Being Reported
              on by the Parent Holding Company.

Exhibit II    Statement of American Express Company

Exhibit III   Statement of American Express Financial Corporation

Exhibit IV    Statement of Growth Portfolio


<PAGE>

                            Exhibit I

                                to

                           Schedule 13G

    One of the persons filing this statement is a parent holding
company.  The relevant subsidiary, American Express Financial
Corporation, a Delaware Corporation, is registered as investment
advisor under section 203 of the Investment Advisors Act of
1940.  Growth Portfolio, a Minnesota Corporation, is registered
as an investment company under section 8 of the Investment
Company Act.  Growth Portfolio is advised by American Express
Financial Corporation.

<PAGE>

                            EXHIBIT II

                                to

                          SCHEDULE 13G

                            under the

                 Securities Exchange Act of 1934

American Express Company, American Express Tower, World
Financial Center, New York, New York disclaims beneficial
ownership of the securities referred to in the Schedule 13G to
which this exhibit is attached, and the filing of this Schedule
13G shall not be construed as an admission that American
Express Company is, for the purpose of Section 13(d) or 13(g)
of the Securities Exchange Act of 1934, the beneficial owner of
any securities covered by this Schedule 13G.

Pursuant to Rule 13d-1(f) (1) and subject to the preceding
disclaimer, American Express Company affirms it is individually
eligible to use Schedule 13G and agrees that this Schedule is
filed on its behalf, and authorizes the President, any Vice
President, the comptroller, the Secretary, the General Counsel,
any Associate General Counsel or any Counsel, each with power
to act singly, of each subsidiary of American Express Company
making this filing to sign this statement on behalf of American
Express Company.


                              AMERICAN EXPRESS COMPANY



                              By:____________________________
                              Name:       Stephen P. Norman
                              Title:      Secretary

<PAGE>

                           Exhibit III

                                to

                           Schedule 13G

                             Under the

                  Securities Exchange Act of 1934


    Pursuant to Rule 13d-1(f)(1), American Express Financial
Corporation affirms that it is individually eligible to use
Schedule 13G and agrees that this Schedule is filed in its behalf.


                              American Express Financial Corporation


                                  By:                         
                                     Steve Turbenson
                                     Director - External Reports
                                     and Tax

<PAGE>


                            Exhibit IV

                                to

                           Schedule 13G

                             Under the

                  Securities Exchange Act of 1934


    Pursuant to Rule 13d-1(f)(1), Growth Portfolio affirms that it is
    individually eligible to use Schedule 13G and agree that thisSchedule is
    filed on its behalf.


                                            Growth Portfolio




                                    By:                            
                                       Leslie L. Ogg
                                       Vice President and General Counsel