As filed with the Securities and Exchange Commission on August 5, 1996
                                             Registration No. 333-______


                    SECURITIES AND EXCHANGE COMMISSION
                          Washington, D.C. 20549
                                     
                                 FORM S-4
                          REGISTRATION STATEMENT
                                   UNDER
                        THE SECURITIES ACT OF 1933
                                     
                               MASTEC, INC.
          (Exact name of Registrant as specified in its charter)

           Delaware                       1623                   59-1259279
(State or other jurisdiction of (Primary Standard Industrial (I.R.S. Employer
incorporation or organization)   Classification Code Number) Identification No.)

                           3155 N.W. 77th Avenue
                         Miami, Florida 33122-1205
                              (305) 599-1800

            (Address, including zip code, and telephone number,
     including area code, of Registrant's principal executive offices)

                           Jose M. Sariego, Esq.
                  Senior Vice President - General Counsel
                               MasTec, Inc.
                           3155 N.W. 77th Avenue
                         Miami, Florida 33122-1205
                              (305) 599-2314

         (Name, address, including zip code, and telephone number,
                including area code, of agent for service)
                                     
                                Copies to:

                          Stephen I. Glover, Esq.
                 Fried, Frank, Harris, Shriver & Jacobson
                      1001 Pennsylvania Avenue, N.W.
                          Washington, D.C. 20004
                                     
    Approximate date of commencement of proposed sale to public: As soon as
practicable after this Registration Statement becomes effective.
    
    If  the  securities being registered on this Form are being offered  in
connection  with the formation of a holding company and there is compliance
with General Instruction G, check the following box.
    
    If  any  of  the  securities being registered on this Form  are  to  be
offered  on  a delayed or continuous basis pursuant to Rule 415  under  the
Securities  Act of 1933, other than securities offered only  in  connection
with dividend or interest reinvestment plans, check the following box. _X_
                      
                      
                      
                      
                      
                                                                  Page 1 of 23
                      
                      CALCULATION OF REGISTRATION FEE
                                     
                                  Proposed    Proposed    
                                  maximum     maximum     Amount of
Title of each class   Amount to   offering    aggregate   registration
of securities to be   be          price per   offering    fee (1)
registered           registered   share (1)   price (1)      
                                                               
 Common Stock ($.10    500,000      $24.38    $12,218,750    $4,203
     par value)         shares                    

  (1) Estimated solely for the purpose of calculating the registration fee,
      pursuant to Rule 457(c), on the basis of the average of the high  and
      low prices of the Common Stock, $.10 par value, of the Registrant  on
      the Nasdaq National Market on July 31, 1996.
  
      THE  REGISTRANT  HEREBY AMENDS THIS REGISTRATION  STATEMENT  ON  SUCH
  DATE  OR DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL  THE
  REGISTRANT SHALL FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES  THAT
  THIS   REGISTRATION  STATEMENT  SHALL  THEREAFTER  BECOME  EFFECTIVE   IN
  ACCORDANCE  WITH SECTION 8(A) OF THE SECURITIES ACT OF 1933, AS  AMENDED,
  OR  UNTIL THE REGISTRATION STATEMENT SHALL BECOME EFFECTIVE ON SUCH  DATE
  AS  THE  SECURITIES  AND  EXCHANGE COMMISSION, ACTING  PURSUANT  TO  SAID
  SECTION 8(A), MAY DETERMINE.
  

































                                                                  Page 2 of 23
                      
                           CROSS REFERENCE SHEET
                 PURSUANT TO ITEM 501(b) OF REGULATION S-K
  
  Form  S-4 Item  Number and Heading       Caption or Location in Prospectus
  
A.  Information About The Transaction        

1.Forepart  of the Registration Statement  Facing page of Registration  
and Outside Front Cover Page of Prospectus Statement; Cross Reference Sheet;
Prospectus                                 Outside Front Cover of Prospectus
2.Inside  Front  and Outside Back Cover    Inside  Front  and  Outside   Back
Pages of Prospectus                        Cover Pages of Prospectus
3.Risk Factors and Ratio of Earnings to    The Company, Risk Factors,
Fixed Charges and Other Information        Selected Financial Information
4.Terms of the Transaction                  Not Applicable
5.Pro Forma Financial Information           Not Applicable
6 Material  Contracts with the Company    
Being Acquired                              Not Applicable
7.Additional Information Required for    
Reoffering by Persons and Parties    
Deemed to be Underwriters                   Not Applicable
8.Interests of Named Experts and Counsel    Not Applicable
9.Disclosure  of Commission  Position  on    
Indemnification  for   Securities   Act     Not Applicable
Liabilities
                                             
B.  Information About the Registrant

10. Information with Respect to S-3         Incorporation of Certain Information
Registrants                                 by  Reference; The Company
11. Incorporation of Certain                Information Incorporated by
Information by Reference                    Reference
12. Information with Respect to  S-2    
or S-3 Registrants                          Not Applicable
13. Incorporation of Certain    
Information by Reference                    Not Applicable
14. Information with Respect to    
Registrants  Other  Than  S-3  or S-2       Not Applicable
Registrants
                                             
C. Information About the Company Being
  Acquired

15. Information with Respect to S-3         
Companies                                   Not Applicable
16. Information with Respect to S-3    
or S-2 Companies                            Not Applicable
17. Information  with  Respect to    
Companies Other Than S-3  or S-2            Not Applicable
Companies
                                             
D.Voting and Management Information

18. Information if Proxies, Consents,    
or Authorizations are to be Solicited       Not Applicable
19. Information if Proxies, Consents,    
or Authorizations are not to be    
Solicited or in an Exchange Offer           Not Applicable
                                                                  Page 3 of 23
                      
                             SUBJECT TO COMPLETION
                  PRELIMINARY PROSPECTUS DATED AUGUST 5, 1996
                                       
                                500,000 SHARES

                                 MASTEC, INC.
                                       
                                 Common Stock

    This Prospectus relates to the issuance from time to time by MasTec,  Inc.,
a  Delaware  corporation (the "Company"), of shares of the Company's  common
stock,  $.10 par value (the "Common Stock"), in an aggregate amount  of  up  to
500,000 shares, upon terms to be determined at the time of such offering.   The
Common  Stock may be offered in such amounts, at such prices and on such  terms
to be set forth in a supplement to this prospectus (a "Supplement").

    The  Common  Stock is to be offered directly by the Company  in  connection
with  the  acquisition  of the assets of, or ownership  interests  in,  certain
entities engaged in the same or similar lines of business as the Company or any
of  its subsidiaries.  The specific terms under which the Common Stock is being
offered in connection with the delivery of this Prospectus will be set forth in
the  applicable Prospectus Supplement and will include the specific  number  of
shares of Common Stock and the issuance price per share.  The Common Stock  may
not  be  offered  through this Prospectus without delivery  of  the  applicable
Prospectus Supplement.
                                       
                   _________________________________________

   THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
      AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS
         THE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON
      THE    ACCURACY    OR    ADEQUACY    OF   THIS   PROSPECTUS.    ANY
             REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
                   _________________________________________

                The date of this Prospectus is August 5, 1996.
  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  Page 4 of 23
                      
                             AVAILABLE INFORMATION
   
   The  Company is subject to the informational requirements of the Securities
Exchange  Act  of  1934, as amended (the "Exchange Act"), and,  in  accordance
therewith,  files  reports, proxy statements and other  information  with  the
Securities  and  Exchange Commission (the "Commission").  Such reports,  proxy
statements  and  other information filed by the Company can be  inspected  and
copied  at  the  public reference facilities maintained by the  Commission  at
Judiciary  Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549  and  at  the
following regional offices of the Commission: Seven World Trade Center,  Suite
1300,  New  York,  New York 10048; and Northwestern Atrium  Center,  500  West
Madison  Street, Suite 1400, Chicago, Illinois 60661.  Copies of such material
can be obtained at prescribed rates by writing to the Commission, Public Refer
ence  Section,  450  Fifth Street, N.W., Washington, D.C. 20549.   The  Common
Stock  is  listed  on  the  Nasdaq National Market under  the  symbol  "MASX."
Reports, proxy and information statements and other information concerning the
Company can also be inspected at the Nasdaq National Market at 1735 17 Street,
N.W., Washington, D.C. 20006.

   This  Prospectus constitutes part of a Registration Statement on  Form  S-4
(together   with  all  amendments  and  exhibits  thereto,  the  "Registration
Statement")  and  does not contain all of the information  set  forth  in  the
Registration Statement, certain parts of which have been omitted in accordance
with  the  rules  and regulations of the Commission.  For further  information
with  respect  to the Company and the securities offered hereby, reference  is
made  to the Registration Statement and to the exhibits and schedules thereto.
Statements  made  in  this  Prospectus as to the  contents  of  any  contract,
agreement  or  other document referred to are not necessarily complete.   With
respect to each such contract, agreement or other document filed as an exhibit
to  the  Registration Statement, reference is made to the exhibit for  a  more
complete  description of the matter involved, and such statement is  qualified
in its entirety by such reference.

                 INFORMATION INCORPORATED BY REFERENCE

  The following documents, previously filed by the Company with the Commission
pursuant to the Exchange Act, are incorporated herein by reference:

     The  Company's Annual Report on Form 10-K for the year ended December 31,
     1995;
     
     The  Company's Quarterly Report on Form 10-Q for the quarter ended  March
     31, 1996;
     
     The Company's Current Report on Form 8-K dated April 30, 1996;
     
     The Company's Proxy Statement for its 1996 Annual Meeting of Stockholders
     dated May 16, 1996; and
     
     The Company's Current Report on Form 8-K/A dated July 15, 1996.
     
   Each document filed by the Company pursuant to Sections 13(a), 13(c), 14 or
15(d) of the Exchange Act, subsequent to the date of this Prospectus, shall be
deemed to be incorporated by reference into this Prospectus and made a part of
this  Prospectus  from  the date any such document is filed.   Any  statements
contained in a document incorporated or deemed to be incorporated by reference
herein  shall  be  deemed to be modified or superseded for  purposes  of  this
                                                                  
                                                                  Page 5 of 23
                      

Prospectus to the extent that a statement contained in this Prospectus (or  in
any other subsequently filed document which also is incorporated or deemed  to
be  incorporated by reference herein) specifically modifies or supersedes such
statement.   Any statement so modified or superseded shall not  be  deemed  to
constitute  a  part  of this Prospectus except as so modified  or  superseded.
Capitalized  terms  not  otherwise defined  herein  shall  have  the  meanings
assigned  to  them in the Company's Annual Report on Form 10-K  for  the  year
ended December 31, 1995, incorporated herein by reference.

   This Prospectus incorporates documents by reference which are not presented
herein or delivered herewith.  These documents are available upon request from
MasTec,  Inc.,  3155  N.W. 77th Avenue, Suite 135, Miami, Florida  33122-1205,
telephone (305) 599-1800, Attention: Nancy J. Damon, Corporate Secretary.

                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                                                  Page 6 of 23
                      
                                  THE COMPANY
                                       
      The  following summary is qualified in its entirety by the more  detailed
information and financial statements, including the notes thereto, incorporated
by reference in this Prospectus.
      
      MasTec, Inc. (together with its subsidiaries and affiliates, "MasTec"  or
the  "Company") is one of the world's largest contractors specializing  in  the
build-out   of  telecommunications  infrastructure.   The  Company's  principal
business  consists of the design, installation, and maintenance of the  outside
physical  plant  for  telephone  and  cable television  communications  systems
("outside  plant services"), including the installation of aerial,  underground
and  buried copper, coaxial and fiber optic cable networks and the construction
of  wireless antenna networks for telecommunication service companies  such  as
local  exchange carriers, long-distance carriers, competitive access providers,
cable  television  operators and cellular phone companies.   The  Company  also
installs central office switching equipment ("switching"), and provides design,
installation  and  maintenance of integrated voice, data and video  local  area
networks  and  wide  area  networks inside buildings  ("inside  wiring").   The
Company   believes   it   is  the  largest  independent  contractor   providing
telecommunications infrastructure construction services in  the  United  States
and Spain and one of the largest in Argentina, Chile and Peru.

      The Company is able to provide a full range of infrastructure services to
its  telecommunications company customers.  Domestically, the Company  provides
outside   plant  services  to  local  exchange  carriers  such   as   BellSouth
Telecommunications, Inc. ("BellSouth"), U.S. West Communications,  Inc.  ("U.S.
West"),  SBC  Communications,  Inc.,  United  Telephone  of  Florida,  Inc.  (a
subsidiary  of  Sprint  Corporation) and GTE Corp.   MasTec  currently  has  18
exclusive, multi-year service contracts ("master contracts") with regional bell
operating companies ("RBOCs") and other local exchange carriers to provide  all
of  their outside plant requirements up to a specific dollar amount per job and
within certain geographic areas.  Internationally, the Company provides outside
plant  services,  turn-key  switching system  installation  and  inside  wiring
services   to  Telefonica  de  Espana,  S.A.  ("Telefonica")  under  multi-year
contracts  similar  to those in the U.S.  Telefonica has committed  to  minimum
levels  of work under these contracts totaling approximately $200 million (at 
current exchange rates) per year in 1996, 1997 and 1998.

      The Company also provides outside plant services to long distance 
carriers such as MCI Communications Corporation and Sprint Corporation, 
competitive access providers such as MFS Communications Company, Inc., Sprint 
Metro and MCI Metro, cable television operators such as Time Warner, Inc.,  
Continental Cablevision, Inc., and Media One, and wireless communications
providers such as PCS Primeco and Sprint Spectrum, L.P.. Inside wiring services 
are being provided to large corporate customers such as First Union National 
Bank ("First Union"), IBM, Medaphis, Smith Barney, Inc. and Dean Witter  
Reynolds, Inc. and to universities and government agencies. The Company also  
provides infrastructure services to public utilities and the traffic control   
and highway safety industry, and provides general construction and project 
management services to state and local governments.

      The  telecommunications industry which the Company services is undergoing
fundamental   changes   in   most   markets   throughout   the world. The
Telecommunications  Act  of  1996  in  the  United  States,  agreements   among
participating  countries  in  the  European  Community  and  privatization  and
regulatory  initiatives in South and Central America are removing  barriers  to

                                                                  Page 7 of 23
                      

competition.   In addition, growing customer demand for enhanced  voice,  video
and   data   telecommunications  have  increased  bandwidth  requirements   and
highlighted network bandwidth limitations in many markets.
      
      The  Company  believes that these industry trends will  create  increased
demand for telecommunications infrastructure services in four ways.

     *      Increased  customer demand for bandwidth will compel service
          providers to upgrade existing networks to broadband technologies
          such as fiber optic cable.
     
     *      Competitive pressures will force existing service providers to
          attempt  to  reduce their cost structures, leading to  increased
          outsourcing  of outside plant services to lower cost independent
          contractors.
     
     *      New  service providers in previously monopolistic markets will
          ultimately require their own infrastructure.
     
     *      Deployment of more powerful multi-media computers in  business
          will  increase the demand for inside wiring services to  install
          communications networks with greater bandwidth capacity.
     
      The  Company believes that it is well positioned to capitalize  on  these
trends  and  is  pursuing  a strategy of growth in its  core  business  through
internal  expansion and strategic acquisitions.  The Company believes that  the
volume of business generated under existing contracts will increase as a result
of  the  anticipated general increase in demand for its services.  In addition,
the Company believes that its reputation for quality and reliability, operating
efficiency, financial strength, technical expertise, presence in key geographic
areas  and ability to achieve economies of scale provide competitive advantages
in  bidding  for  and wining new contracts for telecommunication infrastructure
projects.

      The  Company  also plans to continue to make strategic acquisitions.   In
April  1996,  MasTec  acquired Sistemas e Instalaciones de  Telecomunicaciones,
S.A.  ("Sintel"), the largest telecommunications infrastructure  contractor  in
Spain, from Telefonica, the sole provider of public switched telephony in Spain
(the  "Sintel Acquisition").  The Sintel Acquisition has positioned the Company
to  take  advantage  of increased competition coming to Europe  and  the  rapid
upgrading  of  telecommunications services expected in Latin America.   In  the
United  States,  the Company is continuing to pursue opportunities  to  acquire
selected  operators  that  will enable the Company  to  expand  its  geographic
coverage and customer base without the risks and expense of start-up operations
and to acquire additional management talent for future growth.

      The  principal executive offices of the Company are located at 3155  N.W.
77th Avenue, Miami, Florida, 33122-1205, telephone (305) 599-1800.

                        SELECTED FINANCIAL INFORMATION
                                       
     The following table presents selected consolidated financial information
of the Company and selected combined financial information of the CT Group as
of the dates and for each of the periods indicated.  The selected financial
data set forth below should be read in conjunction with the Consolidated
Financial Statements or the Combined Financial Statements, as the case may be,
                                                                 
                                                                  Page 8 of 23
                      

the notes thereto and "Management's Discussion and Analysis of Financial
Condition and Results of Operations" included in the Company's Annual Report on
Form 10-K incorporated herein by reference.

                        Year Ended December 31,
                          1995       1994       1993      1992           1992
                                    (1-2)        (3)       (3)            (3)
                        (In thousands, except per share amounts)
Income statement data:
Revenue                 $174,583   $111,294    $44,683    $34,136       $31,588
Costs of revenue         130,762     83,952     28,729     22,163        22,970
                        ---------  ---------   --------   --------      --------
Gross profit              43,821     27,342     15,954     11,973         8,618
General and                                                                    
  administrative
  expenses                19,081     13,022      9,871      3,289         2,796
Depreciation and
amortization               6,913      4,439        609        371           359
                        ---------  ---------   --------   --------      --------
   Operating Income       17,827      9,881      5,474      8,313         5,463
Interest expense (4)       4,954      3,587        133         33            29
Interest and dividend                                                          
income (5)                 3,349      1,469        315        207           227
Special charge-real                                                            
estate and
investments write-
downs                     23,086          0          0          0             0
Other income  
(expense), net             2,028      1,009       (81)        209            85
(Losses) equity in                                                             
earnings of                                                                    
unconsolidated
companies and
minority interest           (139)        247      1,177      (416)         (446)
(Benefit) provision                                                            
for income taxes (6)     (1,835)      3,211      2,539      3,113         1,992
                        ---------  ---------   --------   --------      --------
(Loss) income from                                                             
continuing operations   $(3,140)     $5,808     $4,213     $5,167        $3,308
(6)
Average shares            16,046     16,077     10,250     10,250        10,250
outstanding                                        (7)        (7)           (7)
(Loss) primary                                                                 
earnings per share                                                             
from continuing 
operations               $(0.20)      $0.36      $0.41      $0.50         $0.32
                                                                               
Balance sheet data:                                                            
Property and  
equipment, net           $44,571    $40,102     $4,632     $3,656        $2,406
Total assets             170,163    142,452     21,325     23,443        11,733
Total long-term debt      44,226     35,956      3,579        855           371
Stockholders'             50,504     50,874     10,943     15,690         9,436
equity(8)



                                                                  Page 9 of 23
                      

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

(1)  Includes  the results of the CT Group for the full year 1994, the  results
     of  Burnup  &  Sims from March 11, 1994 through the end of 1994,  and  the
     results of DTI from June 22, 1994 through the end of 1994.

(2)  The  1994  results  of operations have been reclassified  to  reflect  the
     discontinuation of certain non-core operations of the Company.  Net assets
     of  discontinued operations at December 31, 1995, have been segregated  in
     the consolidated balance sheet.  See Note 16 to the Consolidated Financial
     Statements   and  "Management's  Discussion  and  Analysis  of   Financial
     Condition  and  Results  of  Operations-Overview-Discontinued  Operations"
     included  in the Company's Annual Report on Form 10-K for the  year  ended
     December 31, 1995, incorporated herein by reference.

(3)  Includes  the results and financial condition of the CT Group  only.   See
     "Management's Discussion and Analysis of Financial Condition  and  Results
     of  Operations-Overview-The Acquisition" included in the Company's  Annual
     Report  on  Form  10-K for the year ended December 31, 1995,  incorporated
     herein by reference.

(4)  Included  is interest due to stockholders from outstanding notes amounting
     to $135,000 for the year ended December 31, 1995 and $223,000 for the year
     ended December 31, 1994.

(5)  Included  is  interest accrued from notes from stockholders  amounting  to
     $289,000  for the year ended December 31, 1995, and $304,000 for the  year
     ended December 31, 1994.

(6)  The  CT  Group  was  not  subject to income taxes  because  it  was  an  S
     corporation  and, as a consequence, income from continuing operations  has
     been adjusted to reflect a pro forma provision for income taxes.

(7)  Reflects the shares of common stock of the Company received by the  former
     shareholders of the CT Group pursuant to the acquisition by the Company of
     Burnup  &  Sims and not the outstanding shares of common stock of  the  CT
     Group.

(8)  See  Note  12  to the Consolidated Financial Statements, included  in  the
     Company's Annual Report on Form 10-K for the year ended December 31, 1995,
     incorporated herein by reference, regarding distributions made to  the  CT
     Group  shareholders in connection with the acquisition by the  Company  of
     Burnup & Sims.



                                       
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                                                  Page 10 of 23
                      
                                 
                                 RISK FACTORS

     An investment in the shares of Common Stock offered hereby involves a high
degree of risk.  In addition to the other information contained or incorporated
by  reference  herein, the following factors should be considered carefully  in
evaluating the Company and its business prospects before purchasing any  shares
of Common Stock.

      The  Private  Securities Litigation Reform Act of 1995 provides  a  "safe
harbor"  for forward-looking statements.  Certain statements included  in  this
Prospectus  are  forward-looking, such as statements  regarding  the  Company's
growth  strategy.  Such forward-looking statements are based on  the  Company's
current  expectations  and are subject to a number of risks  and  uncertainties
that  could  cause  actual results in the future to differ  significantly  from
results expressed or implied in any forward-looking statements made by,  or  on
behalf  of,  the Company.  These risks and uncertainties include, but  are  not
limited  to,  uncertainties relating to the Company's  relationships  with  key
customers and implementation of the Company's growth strategy.  These and other
risks  are  detailed below as well as in other documents filed by  the  Company
with the Commission.
       
Dependence on Key Customers

      For  the  year ended December 31, 1995, Sintel and the Company derived  a
substantial  portion  of their revenue from the provision of  telecommunication
infrastructure  services  to  certain  key  customers.   Approximately  88%  of
Sintel's  revenue  was derived from services performed for Telefonica  and  its
affiliates,  and  approximately 42% of the Company's  revenue  from  continuing
operations was derived from services performed for BellSouth.  On a  pro  forma
basis,  after  giving effect to the Sintel Acquisition, 52%  of  the  Company's
revenue  from continuing operations for the year ended December 31, 1995  would
have  been  derived  from services performed for Telefonica,  and  17%  of  its
revenue  would  have  been  derived  from  services  performed  for  BellSouth.
Although the Company's strategic plan envisions diversification of its customer
base,  the  Company  anticipates  that it will  continue  to  be  dependent  on
Telefonica  and  its  affiliates and the RBOCs with  which  it  currently  does
business  for  a  significant portion of its revenue.  There are  a  number  of
factors  that could adversely affect Telefonica or the RBOCs and their  ability
or  willingness to fund capital expenditures in the future, which in turn could
negatively  affect the Company, including the potential adverse nature  of,  or
the  uncertainty  caused by, changes in governmental regulation,  technological
changes,  increased competition, adverse financing conditions for the  industry
and economic conditions generally.

Risk Inherent in Growth Strategy

      The  Company has grown rapidly through the Burnup Acquisition, the Sintel
Acquisition  and  the acquisition of other companies.  The Company  anticipates
that  it  will  make  additional  acquisitions  and  is  actively  seeking  and
evaluating  new  acquisition candidates.  There can be no  assurance,  however,
that  the  Company will be able to continue to identify and acquire appropriate
businesses  or  obtain financing for such acquisitions on  satisfactory  terms.
The  Company's  growth strategy presents the risks inherent  in  assessing  the
value,  strengths  and weaknesses of growth opportunities,  in  evaluating  the
costs and uncertain returns of  expanding the operations of the Company and  in
integrating  existing operations with new acquisitions.  The  Company's  growth

                                                                  Page 11 of 23
                      

strategy also assumes there will continue to be significant increase in  demand
for  telecommunications  services, which may not  materialize.   The  Company's
anticipated  growth  may place significant demands on the Company's  management
and  its  operational,  financial  and  marketing  resources.    The  Company's
operating  results could be adversely affected if it is unable to  successfully
integrate  new  companies  into its operations.   Future  acquisitions  by  the
Company  could  result  in potentially dilutive issuances  of  securities,  the
incurrence  of  additional  debt and contingent liabilities,  and  amortization
expenses  related  to  goodwill  and  other  intangible  assets,  which   could
materially adversely affect the Company's profitability.

Certain Risks Associated With Sintel

Historical Operating Losses.

      During  1993, 1994 and 1995, Sintel suffered significant net losses.   In
1994,  Sintel's current management implemented a restructuring plan  to  return
Sintel  to  profitability.   As  a  result of the  restructuring  plan,  Sintel
recorded  a 38 billion peseta (approximately $30.1 million) charge in 1995  due
primarily to reductions in personnel.  Absent this restructuring charge, Sintel
would have realized net income in 1995.  The balance of the restructuring  plan
is  being  implemented  in  1996 and contemplates additional  cost  savings  to
achieve  positive  operating  results in 1996 and  beyond.   There  can  be  no
assurance that the restructuring plan will be successful or that other  factors
such  as  greater than anticipated reductions in demand or prices for  Sintel's
services  or  greater  than anticipated labor costs will not  have  a  material
adverse effect on Sintel's financial condition or business prospects.

Labor Relations

      Substantially  all  of Sintel's work force in Spain  is  unionized.   The
agreement  with Sintel's employee representatives has expired and  negotiations
are  on-going for a new labor agreement.  There can be no assurance that a  new
labor  agreement  with  Sintel's  employee  representatives  can  be  concluded
successfully  or  on  favorable terms.  Sintel has suffered  strikes  and  work
stoppages  in  the  past, none of which has had a material  adverse  effect  on
Sintel.  Future strikes or work stoppages could have a material adverse  effect
on Sintel.

Non-Majority Control of Latin American Affiliates

      Sintel  owns 50% or less of the affiliates through which it does business
in  Argentina,  Chile and Peru.  As a result, the Company may not  be  able  to
cause these companies to pay dividends and other distributions and its lack  of
majority control may inhibit the Company's ability to implement strategies that
it favors.




Risk of Investment in Foreign Operations

      The  Company's current and future operations and investments  in  certain
foreign countries are generally subject to the risks of political, economic  or
social  instability,  including  the  possibility  of  expropriation,  currency
devaluation, hyper-inflation, confiscatory taxation or other adverse regulatory

                                                                  Page 12 of 23
                      

or  legislative developments, or limitations on the repatriation of  investment
income,  capital and other assets.  The Company cannot predict whether  any  of
such factors will occur in the future or the extent to which such factors would
have a material adverse effect on the Company's international operations.

Currency Exchange Risks

      The  Company conducts business in several foreign currencies,  which  are
subject to fluctuations in the exchange rate relative to the U.S. dollar.   The
Company  attempts  to  balance  its  foreign currency  denominated  assets  and
liabilities  as a means of hedging its balance sheet currency risk,  but  there
can  be  no  assurance that this balance can be maintained.  In  addition,  the
Company's  results  of operations from foreign activities are  translated  into
U.S.  dollars  at  the average prevailing rates of exchange during  the  period
reported,  which average rates may differ from the actual rates of exchange  in
effect at the time of actual conversion into U.S. dollars.

Dependence on Senior Management

      The  Company's businesses are managed by a small number of key  executive
officers,  including  Jorge Mas, the Company's President  and  Chief  Executive
Officer,  and  Jorge L. Mas, the Company's Chairman.  The loss of  services  of
certain  of  these  executives  could have a material  adverse  effect  on  the
business,  financial condition and results of operations of the  Company.   The
Company's  success  may also be dependent on its ability  to  hire  and  retain
additional qualified management personnel.  There can be no assurance that  the
Company will be able to hire and retain such personnel.

Competition

     The Company competes with independent third parties in most of the markets
in  which  it  operates.   While  the Company  believes  that  it  has  greater
expertise, experience and resources than its competitors in many of the markets
in  which  it  operates, there are relatively few barriers to entry  into  such
markets  and, as a result, any business that has access to persons who  possess
technical  expertise  and adequate financing may become  a  competitor  of  the
Company.   Because of the highly competitive bidding environment in the  United
States  for  the services provided by the Company, the price of a  contractor's
bid  has  often been the deciding factor in determining whether such contractor
was  awarded  a contract for a particular project.  There can be  no  assurance
that  the Company's competitors will not develop the expertise, experience  and
resources  to provide services that achieve greater market acceptance  or  that
are  superior in both price and quality to the Company's services; or that  the
Company will be able to maintain and enhance its competitive position.

     The Company also faces competition from the in-house service organizations
of RBOCs, which employ personnel who perform some of the same types of services
as  those  provided by the Company.  Although a significant  portion  of  these
services  is  currently outsourced, there can be no assurance that existing  or
prospective   customers   of   the   Company   will   continue   to   outsource
telecommunication infrastructure services in the future.






                                                                  Page 13 of 23
                      

Technological Changes

     The telecommunications industry is subject to rapid technological changes.
Wireline  systems that are used for the transmission of video, voice  and  data
face   potential  displacement  by  various  technologies,  including  wireless
technologies  such  as  direct  broadcast  satellite  television  and  cellular
telephony.   Should the use of such technologies increase, it could,  over  the
long term, have an adverse effect on the Company's wireline operations.

Controlling Shareholders

      Jorge  Mas, the Company's President and Chief Executive Officer, and  his
father,  Jorge  L.  Mas,  the Company's Chairman, together  with  other  family
members,  beneficially own more than 50% of the outstanding  shares  of  common
stock of the Company.  Accordingly, they have the power to control the election
of  the  Company's  directors  and  to  effect  certain  fundamental  corporate
transactions.

Shares Eligible for Future Sale

      Future  sales of shares by existing stockholders under Rule  144  of  the
Securities  Act or the issuance of shares of Common Stock upon the exercise  of
options, could materially adversely affect the market price of shares of Common
Stock and could materially impair the Company's future ability to raise capital
through  an offering of equity securities.  The Company has registered  800,000
shares  of  Common Stock for issuance upon exercise of options granted  to  its
employees  under  the  Company's 1994 Stock Incentive Plan  and  an  additional
400,000  shares  of  Common Stock for issuance upon  the  exercise  of  options
granted  to  its non-employee directors under the Company's 1994  Stock  Option
Plan  for  Non-Employee  Directors.  Options to purchase approximately  133,000
shares are currently issued and exercisable.  No prediction can be made  as  to
the  effect,  if  any, that market sales of such shares or the availability  of
such  shares  for  future sales, or market sales of shares  sold  in  offerings
pursuant  to  this  Prospectus or the availability of such  shares  for  future
sales, will have on the market price of shares of Common Stock prevailing  from
time  to  time.   Sales of substantial amounts of Common Stock  in  the  public
market could adversely affect the prevailing market price of the Common Stock.

Anti-Takeover Provisions

      The  Company's  certificate  of  incorporation  and  bylaws  and  certain
provisions  of the Delaware General Corporation Law (the "DGCL")  may  make  it
difficult  in  some respects to effect a change in control of the  Company  and
replace  incumbent management.  The existence of these provisions  may  have  a
negative  impact on the price of the Common Stock, may discourage  third  party
bidders  from making a bid for the Company, or may reduce any premiums paid  to
stockholders  for their Common Stock.  In addition, the Board of  Directors  of
the  Company  has the authority to fix the rights and preferences  of,  and  to
issue shares of, the Company's preferred stock, and to take other actions  that
may  have  the  effect of delaying or preventing a change  of  control  of  the
Company without the action of its stockholders.

                         
                         
                         
                         
                         
                                                                  Page 14 of 23
                      
                         
                         DESCRIPTION OF CAPITAL STOCK
                                       
      The  authorized capital stock of the Company consists of 50,000,000 shares
of  Common Stock, $.10 par value, and 5,000,000 shares of preferred stock, $1.00
par  value  (the "Preferred Stock").  Upon completion of the Offering,  assuming
all registered shares are offered, there will be approximately 17,300,000 shares
of  Common  Stock  issued  and outstanding.  No shares of  Preferred  Stock  are
outstanding.

Common Stock

      The  holders  of Common Stock are entitled to one vote per  share  on  all
matters submitted to a vote of the stockholders.  Holders of Common Stock do not
have cumulative rights, so that holders of more than 50% of the shares of Common
Stock are able to elect all of the Company's directors eligible for election  in
a  given  year.   For  a  description of the  classification  of  the  Board  of
Directors,  see  "Certain Provisions of Certificate of  Incorporation  and  By-
laws."   The  holders  of  Common  Stock are entitled  to  dividends  and  other
distributions  if  and  when declared by the Board of Directors  out  of  assets
legally  available  therefor, subject to the rights of any holder  of  Preferred
Stock  that  may  from  time  to  time be outstanding.   Upon  the  liquidation,
dissolution or winding up of the Company, the holders of shares of Common  Stock
are  entitled  to  share pro rata in the distribution of all  of  the  Company's
assets  remaining  available  for distribution after  satisfaction  of  all  the
Company's  liabilities  and  the payment of the liquidation  preference  of  any
Preferred  Stock that may be outstanding.  The holders of Common Stock  have  no
preemptive  or  other subscription rights to purchase shares  of  stock  of  the
Company,  and  there are no redemption or sinking fund provisions applicable  to
the  Common Stock.  Immediately upon consummation of this Offering, all  of  the
then  outstanding shares of Common Stock will be validly issued, fully paid  and
nonassessable.

      The  transfer  agent  and registrar for the Common Stock  is  First  Union
National Bank of North Carolina.

Preferred Stock

      The  Company's  Restated Certificate of Incorporation (the "Certificate"),
which  is  filed  as  an  exhibit to the Registration Statement  of  which  this
Prospectus  constitutes a part, authorizes the Company's Board of  Directors  to
issue  Preferred  Stock in series and to establish the number of  shares  to  be
included  in  each such series and to fix the designations, powers,  preferences
and rights of the shares of each such series and any qualifications, limitations
or  restrictions  thereof.   Because the Board of Directors  has  the  power  to
establish  the  preferences  and rights of the shares  of  any  such  series  of
Preferred  Stock, it may afford the holders of any Preferred Stock that  may  be
outstanding preferences, powers and rights (including voting rights)  senior  to
the  rights of the holders of Common Stock.  The issuance of Preferred Stock may
have the effect of delaying, deferring or preventing a change in control of  the
Company.  See "Risk Factors-Anti-Takeover Provisions."







                                                                  Page 15 of 23
                      

Delaware Law and Certain Provisions of Certificate of Incorporation and By-laws

      The Certificate, the Company's By-laws (the "By-laws") and Section 203  of
the DGCL contain certain provisions that may make the acquisition of control  of
the  Company  by means of a tender offer, open market purchase, proxy  fight  or
otherwise, more difficult.

      Business  Combinations.   The  Company is a Delaware  corporation  and  is
subject  to Section 203 of the DGCL.  In general, subject to certain exceptions,
Section  203  of  the DGCL prohibits a publicly held Delaware  corporation  from
engaging  in  a  "business combination" with an "interested stockholder"  for  a
period  of  three  years after the date of the transaction in which  the  person
became  an interested stockholder, unless upon consummation of such transaction,
the  interested  stockholder owned 85% of the voting stock  of  the  corporation
outstanding  at  the time the transaction commenced (excluding for  purposes  of
determining  the number of shares outstanding those shares owned by (x)  persons
who  are  directors  and also officers and (y) employee  stock  plans  in  which
employee participants do not have the right to determine confidentially  whether
shares  held subject to the plan will be tendered in a tender or exchange offer)
or  unless the business combination is, or the transaction in which such  person
became an interested stockholder was, approved by the board of directors of  the
corporation  before  the stockholder became an interested  stockholder;  or  the
business  combination is approved by the board of directors of  the  corporation
and authorized at an annual or special meeting of the corporation's stockholders
by  the  affirmative  vote of at least 66 2/3% of the outstanding  voting  stock
which is not owned by the interested stockholder.  For purposes of Section  203,
a  "business  combination" includes mergers, asset sales and other  transactions
resulting  in a financial benefit to the interested stockholder; an  "interested
stockholder" is a person who, together with affiliates and associates, owns (or,
in  the case of affiliates and associates of the issuer, did own within the last
three  years) 15% or more of the corporation's voting stock other than a  person
who owned such shares on December 23, 1987.

      In  addition  to  the  requirements in Section 203  described  above,  the
Certificate  requires the affirmative vote of the holders  of  at  least  eighty
percent  (80%)  of  the voting power of all outstanding shares  of  the  Company
entitled to vote at an election of directors, voting together as a single class,
to approve certain business combinations proposed by a individual or entity that
is  the  beneficial  owner, directly or indirectly, of  more  than  10%  of  the
outstanding  voting  stock  of  the Company.  This  voting  requirement  is  not
applicable  to  "business combinations" if either (i)  the  Company's  Board  of
Directors has approved a memorandum of understanding with such other corporation
with respect to and substantially consistent with such transaction prior to  the
time  that  such  other  corporation became a holder of more  than  10%  of  the
outstanding voting stock of the Company; or (ii) the transaction is proposed  by
a  corporation of which a majority of the outstanding voting stock is  owned  of
record or beneficially by the Company and/or any one or more of its subsidiaries
 .  For purposes of this discussion, a "business combination" includes any merger
or  consolidation of the Company with or into another corporation, any  sale  or
lease  of all or any substantial part of the property and assets of the Company,
or  issuances of securities of the Company in exchange for sale or lease to  the
Company  of  property and assets having an aggregate fair  market  value  of  $1
million or more.

      
      
      
                                                                  Page 16 of 23
                      
      
      Classified  Board  of Directors and Related Provisions.   The  Certificate
provides that the number of directors of the Company shall be fixed from time to
time  by,  or in the manner provided in, the By-laws.  The By-laws provide  that
the number of directors will be six, the Board of Directors will be divided into
three  classes of directors, with each class having a number as nearly equal  as
possible  and that directors will serve for staggered three-year  terms.   As  a
result, one-third of the Company's Board of Directors will be elected each year.
The  classified board provision could prevent a party who acquires control of  a
majority  of the outstanding voting stock of the Company from obtaining  control
of the Board of Directors until the second annual stockholders meeting following
the date the acquiror obtains the controlling interest.

      Directors may be removed with or without cause by the affirmative vote  of
the  holders  of  80  %  of all outstanding voting stock entitled  to  vote.   A
majority  of  the  entire Board of Directors may also remove  any  director  for
cause.   Vacancies on the Board of Directors may be filled by a majority of  the
remaining directors, or by the stockholders.

      Authorized  and  Unissued  Preferred  Stock.   Upon  consummation  of  the
Offering,  there will be 5,000,000 authorized and unissued shares  of  Preferred
Stock.  The existence of authorized and unissued Preferred Stock may enable  the
Board  of  Directors  to render more difficult or to discourage  an  attempt  to
obtain  control of the Company by means of a merger, tender offer, proxy consent
or otherwise.  For example, if in the due exercise of its fiduciary obligations,
the  Board of Directors were to determine that a takeover proposal is not in the
Company's best interests, the Board of Directors could cause shares of Preferred
Stock to be issued without stockholder approval in one or more private offerings
or  other  transactions  that might dilute the voting or  other  rights  of  the
proposed  acquiror  or insurgent stockholder or stockholder group  or  create  a
substantial voting block in institutional or other hands that might undertake to
support  the position of the incumbent Board of Directors.  In this regard,  the
Certificate  grants  the  Board  of  Directors  broad  power  to  establish  the
designations, powers, preferences and rights of each series of Preferred  Stock.
See "- Preferred Stock."

       Stockholder  Action  by  Written  Consent.   The  By-laws  provide   that
stockholder action can be taken only at an annual meeting or special meeting  of
stockholders and can only be taken by written consent in lieu of a meeting  with
the unanimous written consent of the stockholders.

     Indemnification.  The Certificate provides that the Company shall indemnify
each director and officer of the Company to the fullest extent permitted by  law
and  limits  the liability of directors to the Company and its stockholders  for
monetary  damages in certain circumstances.  The Certificate also provides  that
the  Company  may  purchase  insurance on behalf  of  the  directors,  officers,
employees  and agents of the Company against certain liabilities they may  incur
in  such  capacity, whether or not the Company would have the power to indemnify
against such liabilities.


Dividend Restrictions

      The Company's credit facilities currently limit the Company's ability  to
pay  dividends  on the Common Stock.  The payment of dividends  on  the  Common
Stock  is  also subject to the preference that may be applicable  to  any  then
outstanding Preferred Stock.

                                                                  Page 17 of 23
                      

NO  PERSON  HAS  BEEN  AUTHORIZED  TO GIVE  ANY  INFORMATION  OR  TO  MAKE  ANY
REPRESENTATIONS  OTHER  THAN THOSE CONTAINED IN THIS PROSPECTUS  IN  CONNECTION
WITH  THE  OFFERING  MADE HEREBY, AND, IF GIVEN OR MADE,  SUCH  INFORMATION  OR
REPRESENTATIONS  MUST  NOT  BE RELIED UPON AS HAVING  BEEN  AUTHORIZED  BY  THE
COMPANY.   THIS  PROSPECTUS  DOES  NOT  CONSTITUTE  AN  OFFER  TO  SELL  OR   A
SOLICITATION OF AN OFFER TO BUY ANY SECURITIES OTHER THAN THE SHARES OF  COMMON
STOCK  OFFERED HEREBY OR AN OFFER TO SELL OR A SOLICITATION OF AN OFFER TO  BUY
SUCH  SHARES TO ANY PERSON, OR THE SOLICITATION OF A PROXY FROM ANY PERSON,  IN
ANY  JURISDICTION  IN  WHICH SUCH OFFER, SOLICITATION  OF  AN  OFFER  OR  PROXY
SOLICITATION IS UNLAWFUL.  THE DELIVERY OF THIS PROSPECTUS AT ANY TIME DOES NOT
IMPLY  THAT THE INFORMATION HEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO  ITS
DATE.




                               TABLE OF CONTENTS
                                       
                                                   Page
Available Information                                
Incorporation of Certain Documents by                
Reference
The Company                                          
Selected Financial Information                       
Risk Factors                                         
Description of Capital Stock                         
                                                     
                                                     
                                                     
                                       
                                       
                                       
                                       
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                                                                  Page 18 of 23
                      
                PART II. INFORMATION NOT REQUIRED IN PROSPECTUS
                                       

Item 20.  Indemnification of Directors and Officers.

      The  Company's  Amended  and Restated Certificate  of  Incorporation  (the
"Certificate")  provides that the Company shall indemnify to the fullest  extent
authorized by the Delaware General Corporation Law (the "DGCL"), each person who
is  involved in any litigation or other proceeding because such person is or was
a  director  or officer of the Company, against all expense, loss  or  liability
reasonably incurred or suffered in connection therewith.  The Company's  By-laws
provide  that  a director or officer may be paid expenses incurred in  defending
any  proceeding in advance of its final disposition upon receipt by the  Company
of  an  undertaking, by or on behalf of the director or officer,  to  repay  all
amounts so advanced if it is ultimately determined that such director or officer
is not entitled to indemnification.

      Section 145 of the DGCL permits a corporation to indemnify any director or
officer  of  the  corporation  against  expenses  (including  attorney's  fees),
judgments, fines and amounts paid in settlement actually and reasonably incurred
in  connection with any action, suit or proceeding brought by reason of the fact
that  such  person is or was a director or officer of the corporation,  if  such
person acted in good faith and in a manner that he reasonably believed to be  in
or  not  opposed to the best interests of the corporation, and, with respect  to
any  criminal action or proceeding, if he had no reason to believe  his  conduct
was unlawful.  In a derivative action, (i.e., one brought by or on behalf of the
corporation),  indemnification  may be made  only  for  expenses,  actually  and
reasonably incurred by any director or officer in connection with the defense or
settlement of such an action or suit, if such person acted in good faith and  in
a  manner  that  he  reasonably believed to be in or not  opposed  to  the  best
interests  of the corporation, except that no indemnification shall be  made  if
such person shall have been adjudged to be liable to the corporation, unless and
only  to the extent that the court in which the action or suit was brought shall
determine that the defendant is fairly and reasonably entitled to indemnity  for
such expenses despite such adjudication of liability.

      Pursuant  to  Section  102(b)(7) of the DGCL,  the  Company's  Certificate
eliminates  the  liability of a director to the corporation or its  stockholders
for monetary damages for such breach of fiduciary duty as a director, except for
liabilities arising (i) from any breach of the director's duty of loyalty to the
corporation or its stockholders, (ii) from acts or omissions not in  good  faith
or  which  involve intentional misconduct or a knowing violation of  law,  (iii)
under  Section  174  of the DGCL, or (iv) from any transaction  from  which  the
director derived an improper personal benefit.

     The Company has obtained primary and excess insurance policies insuring the
directors  and  officers  of  the Company and its subsidiaries  against  certain
liabilities  they may incur in their capacity as directors and officers.   Under
such  policies, the insurer, on behalf of the Company, may also pay amounts  for
which the Company has granted indemnification to the directors or officers.

Item 21.  Exhibits and Financial Statement Schedules.

The following documents are filed as exhibits to this registration statement:

3.1   Certificate  of  Incorporation of the Company, filed as  Exhibit  3(i)  to
Company's   Registration  Statement  on  Form  S-8  (File  No.   33-55327)   and
incorporated by reference herein.
                                                                  Page 19 of 23
                      

3.2  By-laws of the Company, filed as Exhibit 3.1 to Company's Form 10-Q for the
quarter ended March 31, 1996 and incorporated by reference herein.

5.1  Opinion of Fried, Frank, Harris, Shriver & Jacobson

10.1  Stock  Purchase Agreement dated June 22, 1994, between  MasTec,  Inc.  and
Designed Traffic Installation Co., filed as Exhibit 2 to the Company's Form  8-K
dated July 6, 1994 and incorporated by reference herein.

10.2 Loan and Security Agreement dated January 29, 1995, between the Company and
Barclays  Business Credit, Inc. (now known as Fleet Capital Corporation),  filed
as  Exhibit 10 to the Company's Form 8-K dated February 9, 1995 and incorporated
by reference herein.

10.3  Loan Agreement dated July 14, 1995 between the Company and Devono  Company
Limited,  filed as Exhibit 10 to the Company's Form 10-Q for the  quarter  ended
June 30, 1995 and incorporated by reference herein.

10.4  Amendment to Loan and Security Agreement dated February 29, 1996  between
the Company and Fleet Capital Corporation.

10.5  Stock Option Agreement dated March 11, 1994 between the Company and Arthur
B. Laffer.

10.6   Stock  Purchase  Agreement dated April 1, 1996 between  the  Company  and
Telefonica de Espana, S.A., filed as Exhibit 2.1 to the Company's Form 8-K dated
April 30, 1996 and incorporated by reference herein.

21.1 Subsidiaries of the Company.

23.1 Consent of Coopers & Lybrand L.L.P.

23.2 Consent of Arthur Andersen L.L.P.

23.2  Consent of Fried, Frank, Harris, Shriver & Jacobson (included  in  Exhibit
5.1 above)

24.1  Power  of  Attorney  (included  on Signature  Page  of  this  Registration
Statement)

27.1  Financial data schedule, filed as Exhibit 27.1 to Company's Form 10-Q  for
the quarter ended March 31, 1996 and incorporated by reference herein.

Item 22.  Undertakings

      The  undersigned registrant hereby undertakes to respond to  requests  for
information  that is incorporated by reference into the Prospectus  pursuant  to
Items  4,  10(b), 11 or 13 of this Form, within one business day of  receipt  of
such  request,  and to send the incorporated documents by first  class  mail  or
other equally  prompt means.  This includes information contained  in  documents
filed  subsequent  to the effective date of this Registration Statement  through
the date of responding to the request.

      The undersigned registrant hereby undertakes to supply by means of a post-
effective  amendment all information concerning a transaction, and  the  company
being acquired involved therein, that was not the subject of and included in the
Registration statement when it became effective.
                                                                  Page 20 of 23
                      

     The undersigned registrant hereby undertakes:

(1)  To file, during any period in which offers or sales are being made, a post-
effective amendment to this registration statement:

     (i)   To  include  any  prospectus required  by  section  10(a)(3)  of  the
     Securities Act of 1933;
     
     (ii)  To  reflect in the prospectus any facts or events arising  after  the
     effective  date  of  the registration statement (or the most  recent  post-
     effective  amendment  thereof) which, individually  or  in  the  aggregate,
     represent  a  fundamental  change  in the  information  set  forth  in  the
     registration  statement.  Notwithstanding the foregoing,  any  increase  or
     decrease  in  volume of securities offered (if the total  dollar  value  of
     securities  offered  would not exceed that which was  registered)  and  any
     deviation from the low or high end of the estimated maximum offering  range
     may  be  reflected  in  the form of prospectus filed  with  the  Commission
     pursuant  to  Rule 424(b) if, in the aggregate, the changes in  volume  and
     price represent no more than a 20% change in the maximum aggregate offering
     price  set  forth  in the "Calculation of Registration Fee"  table  in  the
     effective registration statement.
     
     (iii)      To include any material information with respect to the plan  of
     distribution not previously disclosed in the registration statement or  any
     material change to such information in the registration statement.

(2)  That, for the purpose of determining any liability under the Securities Act
of  1933,  each  such  post-effective amendment shall be  deemed  to  be  a  new
registration  statement  relating to the securities  offered  therein,  and  the
offering of such securities at that time shall be deemed to be the initial  bona
fide offering thereof.

(3)   To remove from registration by means of a post-effective amendment any  of
the  securities being registered which remain unsold at the termination  of  the
offering.

      The  undersigned  registrant  hereby  undertakes  that,  for  purposes  of
determining any liability under the Securities Act of 1933, each filing  of  the
registrant's  annual reports pursuant to section 13(a) or section 15(d)  of  the
Securities  Exchange  Act  of 1934 (and, where applicable,  each  filing  of  an
employee  benefit  plan's  annual  report  pursuant  to  section  15(d)  of  the
Securities  Exchange  Act  of 1934) that is incorporated  by  reference  in  the
registration  statement  shall  be deemed to be  a  new  registration  statement
relating  to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

     (1)  The undersigned registrant hereby undertakes as follows: that prior to
any  public reoffering of the securities registered hereunder through use  of  a
prospectus  which  is a part of this registration statement, by  any  person  or
party who is deemed to be an underwriter within the meaning of Rule 145(c),  the
issuer  undertakes that such reoffering prospectus will contain the  information
called  for  by the applicable registration form with respect to reofferings  by
persons  who  may be deemed underwriters, in addition to the information  called
for by the other Items of the applicable form.

      

                                                                  Page 21 of 23
                      
      (2)   The  registrant undertakes that every prospectus (i) that  is  filed
pursuant to paragraph (1) immediately preceding, or (ii) that purports  to  meet
the  requirements of section 10(a)(3) of the Act and is used in connection  with
an  offering  of securities subject to Rule 415, will be filed  as  part  of  an
amendment  to  the  registration statement and  will  not  be  used  until  such
amendment  is  effective,  and that, for purposes of determining  any  liability
under  the Securities Act of 1933, each such post-effective amendment  shall  be
deemed  to  be  a new registration statement relating to the securities  offered
therein, and the offering of such securities at that time shall be deemed to  be
the initial bona fide offering thereof.

     Insofar as indemnification for liabilities arising under the Securities Act
may  be  permitted  to  directors,  officers  and  controlling  persons  of  the
registrant  pursuant to the foregoing provisions, or otherwise,  the  registrant
has  been  advised that in the opinion of the Securities and Exchange Commission
such  indemnification is against public policy as expressed in the Act  and  is,
therefore, unenforceable.  In the event that a claim for indemnification against
such  liabilities (other than the payment by the registrant of expenses incurred
or  paid by a director, officer or controlling person of the registrant  in  the
successful  defense  of  any action, suit or proceeding)  is  asserted  by  such
director, officer or controlling person in connection with the securities  being
registered, the registrant will, unless in the opinion of its counsel the matter
has  been  settled  by controlling precedent, submit to a court  of  appropriate
jurisdiction  the question whether such indemnification by it is against  public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.

     The undersigned registrant hereby undertakes that:

      (1)  For purposes of determining any liability under the Securities Act of
1933, the information omitted from the form of prospectus filed as part of  this
registration  statement in reliance upon Rule 430A and contained in  a  form  of
prospectus filed by the registrant pursuant to Rule 424(b)(1) or (4)  or  497(h)
under  the  Securities  Act  shall be deemed to be  part  of  this  registration
statement as of the time it was declared effective.

      (2)  For the purpose of determining any liability under the Securities Act
of  1933, each post-effective amendment that contains a form of prospectus shall
be  deemed to be a new registration statement relating to the securities offered
therein, and the offering of such securities at that time shall be deemed to  be
the initial bona fide offering thereof.



                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  
                                                                  Page 22 of 23
                      
                           SIGNATURES
                                
      Pursuant to the requirements of the Securities Act  of  1933,
the  Registrant certifies that it has reasonable grounds to believe
that  it  meets all of the requirements for filing on Form S-4  and
has  duly  caused this Registration Statement to be signed  on  its
behalf  by the undersigned, thereunto duly authorized, in the  City
of Miami, State of Florida, on August 2, 1996.

                              MASTEC, INC.

                              /s/ Edwin D. Johnson
                         -------------------------------
                         Edwin D. Johnson
                    Senior  Vice President - Chief Financial Officer
                    (Principal  Financial  and   Accounting Officer)

      The  undersigned directors and officers of MasTec, Inc. hereby
constitute and appoint Edwin D. Johnson and Jose M. Sariego and each
of them with full power to act without the other and with full power
of   substitution   and   resubstitution,  our   true   and   lawful
attorneys-in-fact with full power to execute in our name and  behalf
in  the  capacities indicated below this Registration  Statement  on
Form  S-4  and any and all amendments thereto and to file the  same,
with   all  exhibits  thereto  and  other  documents  in  connection
therewith,  with the Securities and Exchange Commission  and  hereby
ratify and confirm all that such attorneys-in-fact, or any of  them,
or their substitutes shall lawfully do or cause to be done by virtue
hereof.

      Pursuant to the requirements of the Securities Act of 1933, this 
registration statement has been signed by the following persons in the 
capacities and on the dates indicated.

Signature                Title                                     Date
                                                        
   /s/ Jorge Mas         President and Chief Executive Officer  August 2, 1996
_________________________(Principal Executive Officer)
Jorge Mas
                                                 
  /s/ Jorge L. Mas                                              August 2, 1996
_________________________  Chairman of the Board
Jorge L. Mas
   
   /s/ Eliot C. Abbott                                          August 2, 1996
_________________________  Director
Eliot C. Abbott
                                                 
   /s/ Arthur B. Laffer                                         August 2, 1996
_________________________  Director                             
Arthur B. Laffer

   /s/ Samuel C. Hathorn, Jr.                                   August 2, 1996
______________________________Director
Samuel C. Hathorn, Jr.
                                                
  /s/ Jose S. Sorzano                                           August 2, 1996
_______________________  Director
Jose S. Sorzano                                                 Page 23 of 23

Exhibit 5.1                              
                              August 2, 1996

                                                   202-639-7315

MasTec, Inc.
3155 NW 77th Avenue
Miami, FL  33122

Ladies and Gentlemen:

     We are acting as special counsel for MasTec, Inc., a Delaware corporation 
(the "Company") in connection with the offer, sale, and issuance to the public 
(the "Offering") of up to 500,000 shares of the Company's common stock, $.10 par
value (the "Common Stock").  Capitalized terms used herein and not defined 
herein shall have the meaning given to them in the Registration Statement on 
Form S-4 filed by the Company with the Securities and Exchange Commission on 
August 2, 1996 (the "Registration Statement").

     In connection with this opinion, we have (i) investigated such questions 
of law, (ii) examined originals or certified, conformed or reproduced copies of 
such agreements, instruments, documents and records of the Company and its 
subsidiaries, such certificates of public officials and such other documents and
(iii) reviewed such information from officers and representatives of the Company
and its subsidiaries and others as we have deemed necessary or appropriate for 
the purposes of this opinion.

     In all such examinations, we have assumed the legal capacity of all natural
persons executing documents, the genuineness of all signatures, the authenticity
of all original or certified documents, and the conformity to original or 
certified documents of all copies submitted to us as conformed or reproduced 
copies. As to various questions of fact relevant to the opinions expressed 
herein, we have relied upon, and assume the accuracy of, the statements made in 
certificates and oral or written statements and other information of or from 
public officials and officers and representatives of the Company, its 
subsidiaries and others.

     Based upon the foregoing, and subject to the limitations set forth herein, 
we are of the opinion that:

     The shares of Common Stock to be sold by the Company in the
Offering, when issued, delivered and paid for as described in the
section captioned "Terms of Transactions" in the Prospectus and
Prospectus Supplements that are or will be delivered in
connection with the Registration Statement (with the
consideration therefor in the form of cash, services rendered,
personal property, real property, leases of real property, or a
combination thereof, in excess of the par value of such shares)
will be duly authorized, validly issued, fully paid and non-
assessable.

     We hereby consent to the filing of this opinion letter as an
exhibit to the Registration Statement.  In giving this consent,
we do not hereby admit that we are in the category of persons
whose consent is required under Section 7 of the Act.

     
     
                                                                 
                                                                 Page 1 of 2
     
     We are members of the Bars of the State of New York and the
District of Columbia.  The opinions expressed herein are limited
to the federal laws of the United States and the General
Corporation Law of the State of Delaware.


                                   Very truly yours,

                         FRIED, FRANK, HARRIS, SHRIVER & JACOBSON



                               By:   /s/ Stephen I. Glover
                                  _________________________________________
                                        Stephen I. Glover










































                                                                 Page 2 of 2



Exhibit 21.1

Subsidiaries of the Registrant

Set forth below is a list of the significant subsidiaries of the Company as of
July 31, 1996.

Burnup & Sims Communication Services, Inc.
Burnup & Sims ComTec, Inc.
Burnup & Sims Network Designs
Burnup & Sims of California, Inc.
Burnup & Sims of Texas, Inc.*
Burnup & Sims of the Carolinas, Inc.
Burnup & Sims TelCom of Florida, Inc.
Burnup & Sims TSI, Inc.
Carolina Com-Tec, Inc.?
Church & Tower, Inc.+
Church & Tower Fiber Tel, Inc.
Church & Tower of Florida, Inc.+
Church & Tower of TN, Inc.
Designed Traffic Installation Co., Inc.+
LatLink Corporation
MasTec International, Inc.
MasTec Teleport, Inc.
Sistemas e Instalaciones de Telecomunicacion, S.A. #
Utility Line Maintenance, Inc. @

The jurisdiction of incorporation for each of the subsidiaries is Delaware
except the following:  *Texas, +Florida, @ Georgia, #Spain, ?North Carolina.
All operating subsidiaries of the Company are 100% owned, with the exception of
MasTec Teleport, Inc. which is 80% owned.






                                                     Exhibit 23.1
                                                                 
                                                                 

               CONSENT OF INDEPENDENT ACCOUNTANTS
                                
                                

We  consent to the incorporation by reference in the registration
statement of MasTec, Inc. and subsidiaries (formerly the Church &
Tower  Group) on Form S-4 of our report dated March 22, 1996,  on
our  audits  of the consolidated financial statements of  MasTec,
Inc.  and subsidiaries as of December 31, 1995 and 1994, and  for
the years ended December 31, 1995, 1994 and 1993.


/s/ Coopers & Lybrand L.L.P.
- -------------------------------

COOPERS & LYBRAND L.L.P.


Miami, Florida
August 2, 1996





Exhibit 23.2





August 1, 1996



MasTec, Inc.

3155 N.W. 77th Avenue
Miami, Florida 33122
United States

Attention:  Mrs. Carmen Sabater



Dear Sirs,

We hereby consent to the incorporation by reference in the Prospectus
constituting part of this Registration Statement on Form S-4 of our report
dated February 26, 1996 relating to the financial statements of Sintel, S.A.
which appears in MasTec, Inc.'s Current Report on Form 8-K/A dated July 15,
1996.

Yours faithfully,

ARTHUR ANDERSEN



/s/ Juan Ramirez
- ---------------------
Juan Ramirez Aguero