AMERICAN TOWER SYSTEMS CORP
S-8, 1998-05-06
COMMUNICATIONS SERVICES, NEC
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     As filed with the Securities and Exchange Commission on May 6, 1998
                                                      Registration No. 333-

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM S-8
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                       AMERICAN TOWER SYSTEMS CORPORATION
             (Exact name of registrant as specified in its charter)

               Delaware                               65-0598206
        (State or other jurisdiction of           (I.R.S. Employer
         incorporation or organization)          Identification No.)

               116 Huntington Avenue, Boston, Massachusetts 02116
         (Address, including zip code, of principal executive offices)

           American Tower Systems Corporation 1997 Stock Option Plan,
                    as Amended and Restated on April 27, 1998;
                         Exchanged Option Agreements(3)
                            (Full title of the Plan)

                                 STEVEN B. DODGE
                       American Tower Systems Corporation
                              116 Huntington Avenue
                           Boston, Massachusetts 02116
                                 (617) 375-7500
 (Name, address, including zip code, and telephone number, including area code,
                              of agent for service)

                                    Copy to:
                             NORMAN A. BIKALES, ESQ.
                            Sullivan & Worcester LLP
                             One Post Office Square
                           Boston, Massachusetts 02109
                                 (617) 338-2800

<TABLE>
<CAPTION>
                                                  CALCULATION OF REGISTRATION FEE

                                                               Proposed           Proposed
                                               Amount           Maximum            Maximum
          Title of Each Class of               to be        Offering Price        Aggregate          Amount of
       Securities to be Registered           Registered        Per Share       Offering Price     Registration Fee
- --------------------------------------------------------------------------------------------------------------------
<S>           <C>                               <C>              <C>                 <C>                 <C>
Common Stock, $.01 par value..............      (1)              $ (2)               (2)                 $81,460
====================================================================================================================
<FN>
(1)  Consists of an aggregate of 15,000,000  shares of Class A Common Stock, $.01 par value per share ("Class A Common") and Class B
     Common Stock,  $.01 par value per share ("Class B Common")  authorized under the American Tower Systems  Corporation 1997 Stock
     Option Plan, as Amended and Restated on April 27, 1998 and 2,150,000 shares authorized under the Exchanged Option Agreements.
(2)  Pursuant to Rule 457(h) the offering price is calculated based upon the exercise price with respect to 7,392,640 shares subject
     to  options  currently  outstanding  and,  for the  remainder  of the  shares,  the  average  of the bid and ask  prices in the
     "when-issued" trading market on May 4, 1998 in accordance with Rule 457(c) under the Securities Act.
(3)  Exchanged Option Agreements (the "Exchanged Option Agreements")  entered into between the Company and Alan Box, Arnold Chavkin,
     Steven  Dodge,  James  Eisenstein,  Ross Elder,  Peter  Kovaleski,  Thomas  Stoner and Joseph Winn entered into pursuant to the
     consummation of the merger of American Radio Systems Corporation with a subsidiary of CBS Corporation (the "Merger").
</FN>
</TABLE>
<PAGE>
                       AMERICAN TOWER SYSTEMS CORPORATION
                       REGISTRATION STATEMENT ON FORM S-8

                                     PART I

              INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS

Item 1. Plan  Information;  Item 2.  Registrant  Information  and Employee  Plan
Annual Information.

     The documents  containing the  information  required by these items will be
given to employees  participating in the American Tower Systems Corporation 1997
Stock  Option  Plan,  as Amended and Restated on April 27, 1998 (the "Plan") and
are not required to be filed with the  Securities and Exchange  Commission  (the
"Commission") as part of the Registration Statement or as an exhibit thereto.


                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3.  Incorporation of Documents by Reference.

    The  following  documents  which  have been  filed by the  Company  with the
Commission are incorporated by reference in and made a part of this Registration
Statement, as of their respective dates:

    (a) The  Company's  Annual  Report on Form 10-K for the  fiscal  year  ended
December 31, 1997; and

    (b) The Company's Form 8-Ks  filed on  May 1, 1998 and March 20, 1998.

     All documents subsequently filed by the Company pursuant to Sections 13(a),
13(c), 14 and 15(d) of the Exchange Act prior to the filing of a  post-effective
amendment  which  indicates that all securities  offered have been sold or which
deregisters  all  securities  then  remaining  unsold,  shall  be  deemed  to be
incorporated by reference in this  Registration  Statement and to be part hereof
from the date of filing of such documents.

    Any  statement  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  Registration  Statement  to the extent  that a statement
herein,  or in any subsequently  filed document which also is or is deemed to be
incorporated by reference,  modifies or supersedes such statement. Any statement
so  modified  or  superseded  shall  not be  deemed,  except as so  modified  or
superseded, to constitute a part of this Registration Statement.


Item 4.  Description of Securities.

         The  description  of the  Common  Stock  contained  under  the  caption
"Description   of  American  Tower  Systems  Capital  Stock"  in  the  Company's
Prospectus  dated  February 17, 1998 and filed with the  Commission  pursuant to
Rule 424(b) are hereby incorporated by reference (File No. 333-46025).


Item 5.  Interests of Named Experts and Counsel.

    The  validity  of the  shares  offered  hereby  will be passed  upon for the
Company by Sullivan & Worcester LLP, Boston, Massachusetts. Norman A. Bikales, a
member of the firm of Sullivan & Worcester LLP, upon consummation of the Merger,
will be the owner of 9,000 shares of Class A Common and 41,490 shares of Class B
Common and

                                      II-1

<PAGE>



currently  has an option to purchase  20,000  shares of Class A Common  Stock at
$10.00 per share. Mr. Bikales and/or  associates of that firm serve as secretary
or assistant secretaries of the Company and certain of its subsidiaries.

Item 6.  Indemnification of Directors and Officers.

    Section 145 of the Delaware General  Corporation Law (the "DGCL")  provides,
in effect, that any person made a party to any action by reason of the fact that
he is or was a director,  officer,  employee or agent of the Company may and, in
certain  cases,  must be indemnified  by the Company  against,  in the case of a
non-derivative  action,  judgments,   fines,  amounts  paid  in  settlement  and
reasonable expenses (including  attorney's fees), if in either type of action he
acted in good  faith  and in a manner  he  reasonably  believed  to be in or not
opposed to the best  interests of the Company and, in a  non-derivative  action,
which  involves a criminal  proceeding,  in which such person had no  reasonable
cause to believe his conduct was unlawful.  This indemnification does not apply,
in a derivative action, to matters as to which it is adjudged that the director,
officer,  employee or agent is liable to the Company, unless upon court order it
is determined that,  despite such adjudication of liability,  but in view of all
the circumstances of the case, he is fairly and reasonably entitled to indemnity
for expenses.

    Article  XII of the  Company's  By-Laws  provides  that  the  Company  shall
indemnify each person who is or was an officer or director of the Company to the
fullest extent permitted by Section 145 of the DGCL.

    Article Sixth of the Company's Restated  Certificate of Incorporation states
that no director of the Company shall be personally liable to the Company or its
stockholders  for monetary  damages for breach of fiduciary  duty as a director,
except for (i) breach of the  director's  duty of loyalty to the  Company or its
stockholders,  (ii)  acts  or  omissions  not in good  faith  or  which  involve
intentional  misconduct  or knowing  violation  of law,  (iii)  liability  under
Section  174 of the DGCL  relating  to  certain  unlawful  dividends  and  stock
repurchases, or (iv) any transaction from which the director derived an improper
personal benefit.


Item 7.  Exemption from Registration Claimed.

    Not applicable.

Item 8.  Exhibits.

    Listed  below are the exhibit  which are filed as part of this  registration
statement  (according  to the number  assigned to them in Item 601 of Regulation
S-K).


<TABLE>
<CAPTION>
Exhibit No.                    Description of Document                               Exhibit File No.
<S>        <C>                                                             <C>
     5     Opinion of Sullivan & Worcester LLP.............................Filed herewith as Exhibit 5
   10.1    American Tower Systems  Corporation  1997 Stock Option Plan,
           dated as of November 5, 1997, as Amended and Restated on
           April 27, 1998..................................................Filed herewith as Exhibit 10.1
   23.0    Consent of Sullivan & Worcester LLP.............................Contained in the opinion of
                                                                           Sullivan & Worcester LLP filed
                                                                           herewith as part of Exhibit 5
   23.1    Consent of Deloitte & Touche LLP................................Filed herewith as Exhibit 23.1

    24     Power of Attorney...............................................Filed herewith as page II-4 of the
                                                                           Registration Statement
</TABLE>


Item 9.  Undertakings.

    (a)  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:

                                      II-2

<PAGE>



    (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;

    (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:

     provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if
     the information  required to be included in a  post-effective  amendment by
     those  paragraphs  is  contained in periodic  reports  filed by the Company
     pursuant to Section 13 or Section 15(d) of the  Securities  Exchange Act of
     1934 that are incorporated by reference 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; and

             (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;

     (b) For purposes of determining  any liability  under the Securities Act of
1933,  each filing of the Company's  annual report  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; and

     (c) Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors,  officers and controlling  persons of
the Company pursuant to the foregoing provisions,  or otherwise, the Company has
been  advised  that in the opinion of the  Commission  such  indemnification  is
against public policy as expressed in that Act and is, therefore, unenforceable.
In the event that a claim for  indemnification  against such liabilities  (other
than the  payment by the  Company of  expenses  incurred  or paid by a director,
officer or controlling  person of the Company 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 Company 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
Securities  Act of 1933 and will be governed by the final  adjudication  of such
issue.



                                      II-3

<PAGE>

                                   SIGNATURES

     Pursuant to the  requirements  of the  Securities  Act of 1933, the Company
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements  for  filing  on Form S-8 and has  duly  caused  this  registration
statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized,  in the City of Boston,  Commonwealth of Massachusetts,  on the 28th
day of April, 1998.

                                   AMERICAN TOWER SYSTEMS CORPORATION


                                   By: /s/ Steven B. Dodge
                                                 Steven B. Dodge
                                           Chairman of the Board, President
                                           and Chief Executive Officer

     The   undersigned   Officers  and  Directors  of  American   Tower  Systems
Corporation (the "Company")  hereby severally  constitute Joseph L. Winn, Justin
D. Benincasa,  Michael B. Milsom and Norman A. Bikales, and each of them, acting
singly,  our true and  lawful  attorneys  to sign for us and in our names in the
capacities  indicated  below the  Company's  Registration  Statement on Form S-8
relating  to the  registration  of an  aggregate  of  17,150,000  shares  of the
Company's Class A Common Stock,  $.01 par value, and Class B Common Stock,  $.01
par value,  issued or issuable  upon the exercise of options  granted  under the
American  Tower  Systems  Corporation  1997 Stock  Option  Plan,  as Amended and
Restated on April 27, 1998, and the Exchanged Option Agreements, and any and all
amendments  and  supplements  thereto,  filed with the  Securities  and Exchange
Commission, for the purpose of registering such shares, under the Securities Act
of 1933, as amended,  granting unto each of said attorneys,  acting singly, full
power and authority to do and perform each and every act and thing  requisite or
necessary  to be done in and about the  premises,  as fully to all  intents  and
purposes as he might or could do in person,  hereby ratifying and confirming our
signatures to said  registration  statement signed by our said attorneys and all
else that said attorneys may lawfully do and cause to be done by virtue hereof.

     Pursuant  to  the   requirements  of  the  Securities  Act  of  1933,  this
Registration  Statement has been signed below by the following persons on behalf
of the Company and in the capacities and on the dates indicated.


     Signature                            Title                        Date

 /s/ Steven B. Dodge          Chairman, President and            April 28, 1998
      Steven B. Dodge              Chief Executive Officer

 /s/ Joseph L. Winn           Chief Financial Officer and        April 28, 1998
      Joseph L. Winn               Director

 /s/ Justin D. Benincasa      Vice President and                 April 28, 1998
    Justin D. Benincasa            Corporate Controller

 /s/ Alan L. Box              Executive Vice President and       April 28, 1998
        Alan L. Box                Director

 /s/ Arnold L. Chavkin        Director                           April 28, 1998
     Arnold L. Chavkin

 /s/ J. Michael Gearon, Jr.   Executive Vice President and       April 28, 1998
   J. Michael Gearon, Jr.          Director



                                      II-4

<PAGE>




     Signature                            Title                        Date

 /s/ Thomas H. Stoner         Director                           April 28, 1998
      Thomas H. Stoner



                                      II-5

<PAGE>



                                  EXHIBIT INDEX

     Listed below are the exhibit  which are filed as part of this  registration
statement  (according  to the number  assigned to them in Item 601 of Regulation
S-K).


<TABLE>
<CAPTION>
Exhibit No.                    Description of Document                           Exhibit File No.          Page

<S>        <C>                                                             <C>                              <C>
     5     Opinion of Sullivan & Worcester LLP.............................Filed herewith as Exhibit 5
   10.1    American Tower Systems  Corporation  1997 Stock Option Plan, 
           dated as of November 5, 1997, as Amended and Restated on
           April 27, 1998..................................................Filed herewith as Exhibit 10.1
   23.0    Consent of Sullivan & Worcester LLP.............................Contained in the opinion of
                                                                           Sullivan & Worcester LLP filed
                                                                           herewith as part of Exhibit 5
   23.1    Consent of Deloitte & Touche LLP................................Filed herewith as Exhibit 23.1

    24     Power of Attorney...............................................Filed herewith as page II-4 of
                                                                           the Registration Statement
</TABLE>





                                      II-6

       =================================================================



                       AMERICAN TOWER SYSTEMS CORPORATION

                             1997 Stock Option Plan
                    As Amended and Restated on April 27, 1998



       =================================================================




<PAGE>



<TABLE>
<CAPTION>
                                        AMERICAN TOWER SYSTEMS CORPORATION
                                              1997 STOCK OPTION PLAN

                                                TABLE OF CONTENTS

                                                                                                               Page

<S>                <C>                                                                                           <C>
         1.       PURPOSE.........................................................................................1

         2.       ADMINISTRATION OF THE PLAN......................................................................1

         3.       OPTION SHARES...................................................................................2

         4.       AUTHORITY TO GRANT OPTIONS......................................................................2

         5.       WRITTEN AGREEMENT...............................................................................2

         6.       ELIGIBILITY.....................................................................................3

         7.       OPTION PRICE....................................................................................3

         8.       DURATION OF OPTIONS.............................................................................4

         9.       VESTING PROVISIONS..............................................................................4

         10.      EXERCISE OF OPTIONS.............................................................................4

         11.      TRANSFERABILITY OF OPTIONS......................................................................5

         12.      TERMINATION OF EMPLOYMENT OR INVOLVEMENT OF OPTIONEE
                  WITH THE COMPANY................................................................................6

         13.      REQUIREMENTS OF LAW.............................................................................6

         14.      NO RIGHTS AS STOCKHOLDER........................................................................7

         15.      EMPLOYMENT OBLIGATION...........................................................................7

         16.      FORFEITURE AS A RESULT OF TERMINATION FOR CAUSE ................................................7

         17.      CHANGES IN THE COMPANY'S CAPITAL STRUCTURE......................................................8

         18.      AMENDMENT OR TERMINATION OF PLAN................................................................9

         19.      EFFECTIVE DATE AND DURATION OF THE PLAN........................................................10
</TABLE>


<PAGE>





                       AMERICAN TOWER SYSTEMS CORPORATION

                             1997 STOCK OPTION PLAN


         1. PURPOSE

         The purpose of this 1997 Stock Option Plan (the "Plan") is to encourage
directors,  consultants and employees of American Tower Systems Corporation (the
"Company")  and its  Subsidiaries  (as  hereinafter  defined) to continue  their
association with the Company and its  Subsidiaries,  by providing  opportunities
for such  persons to  participate  in the  ownership  of the  Company and in its
future growth through the granting of stock options (the "Options") which may be
options  designed to qualify as incentive  stock options  (within the meaning of
Section 422 of the Internal  Revenue  Code of 1986,  as amended (the "Code") (an
"ISO"),  or options not intended to qualify for any special tax treatment  under
the  Code  (a  "NQO").  The  term  "Subsidiary"  as  used  in the  Plan  means a
corporation or other business  organization of which the Company owns,  directly
or indirectly  through an unbroken  chain of  ownership,  fifty percent (50%) or
more of the total combined voting power of all classes of stock.

         2.       ADMINISTRATION OF THE PLAN

         The  Plan  shall  be  administered  by a  committee  (the  "Committee")
consisting  of two or more  members of the  Company's  Board of  Directors  (the
"Board").  The  Committee  shall from time to time  determine to whom options or
other rights shall be granted under the Plan,  whether  options granted shall be
incentive stock options  ("ISOs") or nonqualified  stock options  ("NSOs"),  the
terms of the  options  or other  rights,  and the  number of shares  that may be
granted  under  options.  The  Committee  shall report to the Board the names of
individuals  to whom  stock or options or other  rights are to be  granted,  the
number  of shares  covered,  and the terms and  conditions  of each  grant.  The
determinations  described in this  Section 2 may be made by the  Committee or by
the Board,  as the Board shall direct in its  discretion,  and references in the
Plan to the  Committee  shall be  understood  to refer to the  Board in any such
case.

         The  Committee  shall  select one of its members as Chairman  and shall
hold  meetings at such times and places as it may  determine.  A majority of the
Committee shall constitute a quorum, and acts of the Committee at which a quorum
is present,  or acts reduced to or approved in writing by all the members of the
Committee,  shall be the valid acts of the Committee.  The Committee  shall have
the authority to adopt, amend, and rescind such rules and regulations as, in its
opinion,  may be advisable in the  administration  of the Plan. All questions of
interpretation and application of such rules and regulations, of the Plan and of
options   granted   thereunder  (the   "Options"),   shall  be  subject  to  the
determination of the Committee, which shall be final and binding. The Plan shall
be administered  in such a manner as to permit those Options  granted  hereunder
and  specially  designated  under  Section  5  hereof  as an ISO to  qualify  as
incentive stock options as described in Section 422 of the Internal Revenue Code
of 1986, as amended (the "Code").

         For so long as Section 16 of the  Securities  Exchange Act of 1934,  as
amended from time to time (the  "Exchange  Act"),  is applicable to the Company,
each member of the Committee shall be

                                                        

<PAGE>



a  "non-employee  director" or the  equivalent  within the meaning of Rule 16b-3
under  the  Exchange  Act,  and,  for so long as  Section  162(m) of the Code is
applicable to the Company,  an "outside  director" within the meaning of Section
162 of the Code and the regulations thereunder.

         With  respect to persons  subject  to  Section 16 of the  Exchange  Act
("Insiders"),  transactions  under  the Plan are  intended  to  comply  with all
applicable  conditions of Rule 16b-3 or its successor under the Exchange Act. To
the  extent any  provision  of the Plan or action by the  Committee  fails to so
comply,  it shall be deemed to be modified so as to be in  compliance  with such
Rule, or, if such  modification  is not possible,  it shall be deemed to be null
and void, to the extent permitted by law and deemed advisable by the Committee.

         3.  OPTION SHARES

         The stock  subject to Options under the Plan shall be shares of Class A
and Class B Common  Stock,  par value  $.01 per share (the  "Stock"),  provided,
however,  that  after  the  consummation  of the ATC  Merger as  defined  in the
Agreement  and Plan of Merger by and  between the  Company  and  American  Tower
Corporation,  dated  December 12, 1997, as may be amended,  any Options  granted
shall be for shares of Class A. The total  amount of the Stock  with  respect to
which  Options  may be  granted  (the  "Option  Pool"),  shall not exceed in the
aggregate 15,000,000 shares; provided,  however, such aggregate number of shares
shall be subject to adjustment in accordance  with the provisions of Section 17.
In the event that any  outstanding  Option  shall expire for any reason or shall
terminate by reason of the death or severance of employment of the Optionee, the
surrender of any such Option,  or any other cause, the shares of Stock allocable
to the  unexercised  portion  of such  Option  may again be subject to an option
under the Plan.  The maximum  number of shares of Stock  subject to Options that
may be granted to any Optionee in the  aggregate in any calendar  year shall not
exceed 5,000,000 shares.


         4.  AUTHORITY TO GRANT OPTIONS

         The Committee may determine,  from time to time, which employees of the
Company or any  Subsidiary or other  persons shall be granted  Options under the
Plan, the terms of the Options  (including  without limitation whether an Option
shall be an ISO or a NQO) and the number of shares which may be purchased  under
the Option or Options.  Without  limiting the generality of the  foregoing,  the
Committee  may  from  time to time  grant:  (a) to such  employees  (other  than
employees of a Subsidiary  which is not a corporation)  as it shall determine an
Option or Options to buy a stated  number of shares of Stock under the terms and
conditions  of the Plan which Option or Options will to the extent so designated
at the time of grant  constitute  an ISO;  and (b) to such  eligible  directors,
employees or other  persons as it shall  determine an Option or Options to buy a
stated  number  of shares of Stock  under the terms and  conditions  of the Plan
which Option or Options shall  constitute a NQO.  Subject only to any applicable
limitations set forth elsewhere in the Plan, the number of shares of Stock to be
covered by any Option shall be as determined by the Committee.

         5.  WRITTEN AGREEMENT

         Each Option granted  hereunder shall be embodied in an option agreement
(the "Option Agreement")  substantially in the form of Exhibit 1, which shall be
signed by the Optionee and by

                                       -2-

<PAGE>



the Chief Executive Officer, Chief Financial Officer or the Corporate Controller
of the  Company  for and in the name and on  behalf  of the  Company.  An Option
Agreement  may  contain  such  restrictions  on  exercisability  and such  other
provisions  not  inconsistent  with  the Plan as the  Committee  in its sole and
absolute discretion shall approve.

         6.  ELIGIBILITY

         The  individuals  who shall be eligible for grant of Options  under the
Plan shall be  employees  (including  officers who may be members of the Board),
directors who are not employees and other individuals, whether or not employees,
who render  services of special  importance  to the  management,  operation,  or
development of the Company or a Subsidiary,  and who have  contributed or may be
expected to contribute materially to the success of the Company or a Subsidiary.
An  employee,  director  or other  person  to whom an  Option  has been  granted
pursuant to an Option Agreement is hereinafter referred to as an "Optionee."

         7.  OPTION PRICE

         The  price at which  shares of Stock may be  purchased  pursuant  to an
Option shall be  specified  by the  Committee at the time the Option is granted,
but shall in no event be less than the par value of such shares and, in the case
of an ISO,  except as set forth in the following  sentence,  one hundred percent
(100%) of the fair market value of the Stock on the date the ISO is granted.  In
the case of an employee who owns (or is considered  under Section  424(d) of the
Code as  owning)  stock  possessing  more  than ten  percent  (10%) of the total
combined  voting power of all classes of stock of the Company or any Subsidiary,
the price which shares of Stock may be so purchased  pursuant to an ISO shall be
not less than one hundred and ten percent  (110%) of the fair value of the Stock
on the date the ISO is granted.

         For purposes of the Plan,  the "fair market  value" of a share of Stock
on any date  specified  herein,  shall mean (a) the last  reported  sales price,
regular  way, or, in the event that no sale takes place on such day, the average
of the reported closing bid and asked prices, regular way, in either case (i) as
reported on the New York Stock Exchange  Composite Tape, or (ii) if the Stock is
not  listed or  admitted  to  trading  on the New York  Stock  Exchange,  on the
principal  national  securities  exchange  on which such  security  is listed or
admitted to  trading,  or (iii) if not then listed or admitted to trading on any
national  securities  exchange,  on the NASDAQ National Market System; or (b) if
the Stock is not quoted on such National  Market System,  (i) the average of the
closing bid and asked prices on each such day in the over-the-counter  market as
reported by NASDAQ,  or (ii) if bid and asked  prices for such  security on each
such day shall not have been reported through NASDAQ, the average of the bid and
asked  prices for such day as furnished  by any New York Stock  Exchange  member
firm regularly making a market in such security selected for such purpose by the
Committee;  or (c) if the Stock is not then listed or admitted to trading on any
national  exchange  or quoted in the  over-the-counter  market,  the fair  value
thereof  determined  in good faith by the Committee as of a date which is within
thirty (30) days of the date with  respect to which the  determination  is to be
made;  provided,  however,  that any method of  determining  fair  market  value
employed by the Committee  with respect to an ISO shall be  consistent  with any
applicable laws or regulations pertaining to "incentive stock options."



                                       -3-

<PAGE>



         8.  DURATION OF OPTIONS

         The duration of any Option  shall be specified by the  Committee in the
Option  Agreement,  but no ISO shall be exercisable  after the expiration of ten
(10) years,  and no NQO shall be  exercisable  after the  expiration of ten (10)
years and one (1) day, from the date such Option is granted.  In the case of any
employee who owns (or is considered  under Section 424(d) of the Code as owning)
stock  possessing more than ten percent (10%) of the total combined voting power
of all  classes  of stock of the  Company  or any  Subsidiary,  no ISO  shall be
exercisable  after the expiration of five (5) years from the date such Option is
granted.  The  Committee,  in its sole and absolute  discretion,  may extend any
Option theretofore  granted subject to the aforesaid limits and may provide that
an Option shall be exercisable  during its entire  duration or during any lesser
period of time.

         9.  VESTING PROVISIONS

         Each  Option may be  exercised  so long as it is valid and  outstanding
from time to time,  in part or as a whole,  in such  manner and  subject to such
conditions as the Committee, in its sole and absolute discretion, may provide in
the Option Agreement.

         10.  EXERCISE OF OPTIONS

         Options  shall be exercised  by the  delivery of written  notice to the
Company  setting  forth the number of shares of Stock with  respect to which the
Option is to be  exercised,  accompanied  by payment of the option price of such
shares,  which payment shall be made,  subject to the alternative  provisions of
this Section,  in cash or by such cash equivalents,  payable to the order of the
Company in an amount in United States  dollars equal to the option price of such
shares,  as the  Committee in its sole and absolute  discretion  shall  consider
acceptable.  Such notice shall be  delivered  in person to the  Secretary of the
Company or shall be sent by registered mail,  return receipt  requested,  to the
Secretary of the  Company,  in which case  delivery  shall be deemed made on the
date such notice is deposited in the mail.

         Alternatively,  if the Option  Agreement so  specifies,  and subject to
such rules as may be established  by the Committee,  payment of the option price
may be made through a so-called "cashless exercise"  procedure,  under which the
Optionee shall deliver  irrevocable  instructions  to a broker to sell shares of
Stock  acquired upon exercise of the Option and to remit promptly to the Company
a  sufficient  portion of the sale  proceeds to pay the option price and any tax
withholding resulting from such exercise.

         Alternatively,  payment of the option price may be made, in whole or in
part,  in shares of Stock owned by the  Optionee;  provided,  however,  that the
Optionee  may not make  payment  in shares of Stock  that he  acquired  upon the
earlier  exercise of any ISO (or other  "incentive  stock  option"),  unless and
until he has held the shares until at least two (2) years after the date the ISO
(or such other  incentive  stock  option)  was granted and at least one (1) year
after the date the ISO (or such other option) was exercised.  If payment is made
in whole or in part in shares of Stock,  then the Optionee  shall deliver to the
Company in payment of the option  price of the shares with respect of which such
Option is exercised  (a)  certificates  registered  in the name of such Optionee
representing a number of shares of Stock legally and beneficially  owned by such
Optionee, free of

                                       -4-

<PAGE>



all liens, claims and encumbrances of every kind, and having a fair market value
on the date of delivery of such notice  equal to the option  price of the shares
of Stock with respect to which such Option is to be exercised, such certificates
to be accompanied by stock powers duly endorsed in blank by the record holder of
the  shares of Stock  represented  by such  certificates;  and (b) if the option
price of the shares with respect to which such Option is to be exercised exceeds
such fair market value,  cash or such cash  equivalents  payable to the order to
the Company,  in an amount in United States  dollars equal to the amount of such
excess,  as the  Committee in its sole and absolute  discretion  shall  consider
acceptable.  Notwithstanding  the  foregoing  provisions  of this  Section,  the
Committee,  in its sole and absolute  discretion (i) may refuse to accept shares
of Stock in payment of the option  price of the shares of Stock with  respect to
which such  Option is to be  exercised  and,  in that  event,  any  certificates
representing  shares of Stock  which were  delivered  to the  Company  with such
written  notice shall be returned to such  Optionee  together with notice by the
Company to such  Optionee of the refusal of the  Committee to accept such shares
of Stock and (ii) may accept, in lieu of actual delivery of stock  certificates,
an attestation by the Optionee  substantially  in the form attached  herewith as
Exhibit C or such other form as may be deemed  acceptable by the Committee  that
he or she owns of record the shares to be tendered  free and clear of all liens,
claims and encumbrances of every kind.

         Alternatively,  if the Option  Agreement so  specifies,  payment of the
option price may be made in part by a promissory  note  executed by the Optionee
and  containing  the  following  terms and  conditions  (and such  others as the
Committee  shall,  in its sole and absolute  discretion  determine  from time to
time): (a) it shall be collaterally secured by the shares of Stock obtained upon
exercise of the  Option;  (b)  repayment  shall be made on demand by the Company
and, in any event, no later than three (3) years from the date of exercise;  and
(c) the note shall  bear  interest  at a rate as  determined  by the  Committee,
payable monthly out of a payroll deduction provision;  provided,  however,  that
notwithstanding  the  foregoing (i) an amount not less than the par value of the
shares of Stock with respect to which the Option is being exercised must be paid
in cash, cash  equivalents,  or shares of Stock in accordance with this Section,
and (ii) the payment of such exercise price by promissory  note does not violate
any applicable  laws or regulations,  including,  without  limitation,  Delaware
corporate law or applicable  margin lending rules. The decision as to whether to
permit  partial  payment by a  promissory  note for shares of Stock to be issued
upon exercise of any Option granted shall rest entirely in the sole and absolute
discretion of the Committee.

         As  promptly  as  practicable  after the  receipt by the Company of (a)
written  notice from the  Optionee  setting  forth the number of shares of Stock
with  respect to which such  Option is to be  exercised  and (b)  payment of the
option price of such shares in the form required by the foregoing  provisions of
this  Section,  the  Company  shall  cause  to be  delivered  to  such  Optionee
certificates representing the number of shares with respect to which such Option
has been so exercised  (less a number of shares equal to the number of shares as
to which ownership was attested under the procedure  described in clause (ii) of
the next preceding paragraph).

         11.  TRANSFERABILITY OF OPTIONS

         Options shall not be  transferable  by the Optionee  otherwise  than by
will or under the laws of descent  and  distribution,  and shall be  exercisable
during his or her lifetime only by the  Optionee,  except that the Committee may
specify in an Option  Agreement  that  pertains to an NQO that the  Optionee may
transfer  such NQO to a member of the  Immediate  Family of the  Optionee,  to a
trust

                                       -5-

<PAGE>



solely for the benefit of the Optionee and the Optionee's  Immediate  Family, or
to a partnership or limited liability company whose only partners or members are
the Optionee and members of the Optionee's Immediate Family.  "Immediate Family"
shall mean,  with respect to any Optionee,  such  Optionee's  child,  stepchild,
grandchild,  parent, stepparent,  grandparent,  spouse, sibling,  mother-in-law,
father-in-law,  son-in-law,  daughter-in-law,  brother-in-law, or sister-in-law,
and shall include adoptive relationships.

         12.  TERMINATION OF EMPLOYMENT OR INVOLVEMENT OF OPTIONEE WITH
THE COMPANY

         For purposes of this Section, employment by or involvement with (in the
case of an Optionee  who is not an employee) a  Subsidiary  shall be  considered
employment by or involvement with the Company.  Except as otherwise set forth in
the Option  Agreement,  after the Optionee's  termination of employment with the
Company other than by reason of death or disability, including his retirement in
good  standing  from the employ of the Company for reasons of age under the then
established  rules of the Company,  the Option shall terminate on the earlier of
the  date  of its  expiration  or  three  (3)  months  after  the  date  of such
termination  or  retirement.  After  the  death  of  the  Optionee,  his  or her
executors,  administrators  or any  persons  to whom  his or her  Option  may be
transferred  by will or by the laws of descent and  distribution  shall have the
right to exercise the Option to the extent to which the Optionee was entitled to
exercise  the  Option.  In the  event  that  such  termination  is a  result  of
disability, the Optionee shall have the right to exercise the Option pursuant to
its terms as if such Optionee continued as an employee.

         Authorized  leave of  absence  or absence  on  military  or  government
service shall not constitute  severance of the employment  relationship  between
the Company and the Optionee for purposes of the Plan,  provided that either (a)
such  absence  is for a  period  of no more  than  ninety  (90)  days or (b) the
Employee's  right to  re-employment  after such absence is guaranteed  either by
statute or by contract.

         For Optionees  who are not  employees of the Company,  options shall be
exercisable  for  such  periods  following  the  termination  of the  Optionee's
involvement with the Company as may be set forth in the Option Agreement.

         13. REQUIREMENTS OF LAW

         The Company  shall not be required to sell or issue any shares of Stock
upon the exercise of any Option if the issuance of such shares shall  constitute
or result in a violation by the Optionee or the Company of any provisions of any
law,  statute or  regulation of any  governmental  authority.  Specifically,  in
connection with the Securities Act of 1933, as amended (the  "Securities  Act"),
and any applicable state  securities or "blue sky" law (a "Blue Sky Law"),  upon
exercise  of any Option the  Company  shall not be required to issue such shares
unless the Committee has received evidence satisfactory to it to the effect that
the holder of such Option will not  transfer  such shares  except  pursuant to a
registration  statement in effect under the  Securities Act and Blue Sky Laws or
unless an opinion of counsel  satisfactory  to the Company has been  received by
the Company to the effect that such registration and compliance is not required.
Any  determination  in this connection by the Committee shall be final,  binding
and  conclusive.  The Company shall not be obligated to take any action in order
to cause the exercise of an Option or the  issuance of shares of Stock  pursuant
thereto

                                       -6-

<PAGE>



to comply with any law or regulations of any governmental authority,  including,
without limitation, the Securities Act or applicable Blue Sky Law.

         Notwithstanding  any other  provision of the Plan to the contrary,  the
Company  may refuse to permit  transfer  of shares of Stock if in the opinion of
its legal counsel such transfer would violate  federal or state  securities laws
or subject the Company to liability thereunder. Any sale, assignment,  transfer,
pledge or other  disposition  of shares of Stock  received  upon exercise of any
Option (or any other shares or  securities  derived  therefrom)  which is not in
accordance  with the  provisions  of this Section shall be void and of no effect
and shall not be recognized by the Company.

         Legend  on  Certificates.  The  Committee  may  cause  any  certificate
representing  shares of Stock acquired upon exercise of an Option (and any other
shares or securities  derived therefrom) to bear a legend to the effect that the
securities  represented by such  certificate  have not been registered under the
Federal  Securities Act of 1933, as amended,  or any applicable state securities
laws, and may not be sold, assigned, transferred,  pledged or otherwise disposed
of except in  accordance  with the Plan and  applicable  agreements  binding the
holder and the Company or any of its stockholders.

         14.  NO RIGHTS AS STOCKHOLDER

         No  Optionee  shall have any rights as a  stockholder  with  respect to
shares  covered  by his or her  Option  until  the date of  issuance  of a stock
certificate  for such  shares;  except as  otherwise  provided in Section 17, no
adjustment for dividends or otherwise  shall be made if the record date therefor
is prior to the date of issuance of such certificate.

         15.  EMPLOYMENT OBLIGATION

         The  granting  of any Option  shall not impose  upon the Company or any
Subsidiary  any  obligation to employ or continue to employ any Optionee,  or to
engage or retain the services of any person, and the right of the Company or any
Subsidiary  to terminate  the  employment or services of any person shall not be
diminished  or affected by reason of the fact that an Option has been granted to
him or her.  The  existence  of any Option  shall not be taken  into  account in
determining  any damages  relating to  termination of employment or services for
any reason.

         16.  FORFEITURE AS A RESULT OF TERMINATION FOR CAUSE

         Notwithstanding  any  provision  of the  Plan to the  contrary,  if the
Committee determines,  after full consideration of the facts presented on behalf
of the Company and an Optionee, that

                  (a) the  Optionee  has been  engaged  in fraud,  embezzlement,
         theft, commission of a felony or dishonesty in the course of his or her
         employment by or  involvement  with the Company or a Subsidiary,  which
         damaged  the  Company  or  a  Subsidiary,   or  has  made  unauthorized
         disclosure of trade  secrets or other  proprietary  information  of the
         Company or a  Subsidiary  or of a third  party who has  entrusted  such
         information to the Company or a Subsidiary, or


                                       -7-

<PAGE>



                  (b) the  Optionee's  employment or  involvement  was otherwise
         terminated for "cause," as defined in any employment agreement with the
         Optionee,  if  applicable,  or  if  there  is  no  such  agreement,  as
         determined by the Committee,  which may determine that "cause" includes
         among other  matters the willful  failure or refusal of the Optionee to
         perform and carry out his or her assigned  duties and  responsibilities
         diligently and in a manner satisfactory to the Committee,

then the Optionee's  right to exercise an Option shall  terminate as of the date
of such  act (in the case of (a)) or such  termination  (in the case of (b)) and
the  Optionee  shall  forfeit all  unexercised  Options.  If an  Optionee  whose
behavior the Company asserts falls within the provisions of (a) or (b) above has
exercised  or  attempts  to  exercise  an  Option  prior  to a  decision  of the
Committee,  the Company shall not be required to recognize  such exercise  until
the Committee has made its decision and, in the event of any exercise shall have
taken  place,  it shall be of no force and  effect  (and void ab  initio) if the
Committee makes an adverse  determination;  provided,  however, if the Committee
finds  in  favor  of the  Optionee  then the  Optionee  will be  deemed  to have
exercised such Option  retroactively  as of the date he or she  originally  gave
written notice of his or her attempt to exercise or actual exercise, as the case
may be. The decision of the Committee as to the cause of an Optionee's discharge
and the damage done to the Company or a Subsidiary  shall be final,  binding and
conclusive.  No decision of the Committee,  however,  shall affect in any manner
the finality of the discharge of such Optionee by the Company or a Subsidiary.

         17.  CHANGES IN THE COMPANY'S CAPITAL STRUCTURE

         The  existence of  outstanding  Options shall not affect in any way the
right or power of the Company or its  stockholders  to make or authorize  any or
all  adjustments,  recapitalizations,  reorganizations  or other  changes in the
Company's  capital  structure or its business or any merger or  consolidation of
the Company or any issue of bonds,  debentures,  preferred or preference  stock,
whether or not convertible into the Stock or other securities,  ranking prior to
the Stock or affecting  the rights  thereof,  or warrants,  rights or options to
acquire the same, or the  dissolution  or liquidation of the Company or any sale
or transfer of all or any part of its assets or business or any other  corporate
act or proceeding, whether of a similar character or otherwise.

         The  number of shares of Stock in the  Option  Pool (less the number of
shares theretofore  delivered upon exercise of Options) and the number of shares
of Stock covered by any outstanding  Option and the price per share payable upon
exercise thereof  (provided that in no event shall the option price be less than
the par value of such shares) shall be proportionately adjusted for any increase
or decrease in the number of issued and  outstanding  shares of Stock  resulting
from any subdivision,  split, combination or consolidation of shares of Stock or
the payment of a dividend in shares of stock or other  securities of the Company
on the Stock. The decision of the Board as to the adjustment,  if any,  required
by the provisions of this Section shall be final, binding and conclusive.

         If the Company merges or  consolidates  with a wholly-owned  subsidiary
for  the  purpose  of   reincorporating   itself   under  the  laws  of  another
jurisdiction,  the Optionees  will be entitled to acquire shares of Stock of the
reincorporated  Company  upon the same  terms and  conditions  as were in effect
immediately prior to such reincorporation (unless such reincorporation  involves
a change in the number of shares or the capitalization of the Company,  in which
case proportional adjustments shall

                                       -8-

<PAGE>



be made as  provided  above) and the Plan,  unless  otherwise  rescinded  by the
Board, will remain the Plan of the reincorporated Company.

         Except as otherwise provided in the preceding paragraph, if the Company
is merged or consolidated with another  corporation,  whether or not the Company
is the surviving  entity,  or if the Company is liquidated or sells or otherwise
disposes  of all or  substantially  all of its  assets to another  entity  while
unexercised Options remain outstanding under the Plan, or if other circumstances
occur  in  which  the  Board  in its  sole  and  absolute  discretion  deems  it
appropriate  for the  provisions  of this  paragraph to apply (in each case,  an
"Applicable  Event"),  then (a) each holder of an  outstanding  Option  shall be
entitled,  upon exercise of such Option,  to receive in lieu of shares of Stock,
such stock or other  securities or property as he or she would have received had
he exercised such option  immediately  prior to the Applicable Event; or (b) the
Board may, in its sole and absolute  discretion,  waive,  generally or in one or
more specific cases, any limitations  imposed pursuant to Section 9 so that some
or all  Options  from  and  after a date  prior  to the  effective  date of such
Applicable Event,  specified by the Board, in its sole and absolute  discretion,
shall be  exercisable  in full;  or (c) the Board may, in its sole and  absolute
discretion,  cancel all outstanding and unexercised  Options as of the effective
date of any such Applicable Event; or (d) the Board may, in its sole discretion,
convert  some or all  Options  into  options  to  purchase  the  stock  or other
securities of the surviving  corporation pursuant to an Applicable Event; or (e)
the Board may, in its sole and absolute  discretion,  assume the outstanding and
unexercised options to purchase stock or other securities of any corporation and
convert such options into Options to purchase  Stock,  whether  pursuant to this
Plan or not, pursuant to an Applicable Event; provided,  however,  notice of any
such  cancellation  pursuant  to clause (c) shall be given to each  holder of an
Option not less than  thirty  (30) days  preceding  the  effective  date of such
Applicable Event, and provided further, however, that the Board may, in its sole
and absolute discretion,  waive, generally or in one or more specific instances,
any limitations imposed pursuant to Section 9 with respect to any Option so that
such Option shall be  exercisable  in full or in part,  as the Board may, in its
sole and absolute discretion, determine, during such thirty (30) day period.

         Except as expressly provided herein, the issue by the Company of shares
of Stock or other  securities of any class or series or  securities  convertible
into or exchangeable  or exercisable for shares of Stock or other  securities of
any class or series for cash or property  or for labor or  services  either upon
direct sale or upon the exercise of rights or warrants to subscribe therefor, or
upon  conversion of shares or obligations of the Company  convertible  into such
shares  or other  securities,  shall not  affect,  and no  adjustment  by reason
thereof  shall be made with respect to, the number,  class or price of shares of
Stock then subject to outstanding Options.

         18.  AMENDMENT OR TERMINATION OF PLAN

         The Board may, in its sole and absolute discretion,  modify,  revise or
terminate the Plan at any time and from time to time;  provided,  however,  that
without  the  further  approval  of the  holders of at least a  majority  of the
outstanding  shares of Stock,  the Board  may not (a)  materially  increase  the
benefits  accruing to Optionees  under the Plan or make any  "modifications"  as
that term is defined under Section  424(h)(3) (or its  successor) of the Code if
such  increase in  benefits  or  modifications  would  adversely  affect (i) the
availability  to the Plan of the  protections  of Section  16(b) of the Exchange
Act, if applicable to the Company,  or (ii) the qualification of the Plan or any
Options for "incentive  stock option"  treatment  under Section 422 of the Code;
(b) change the  aggregate  number of shares of Stock  which may be issued  under
Options pursuant to the provisions

                                       -9-

<PAGE>



of the Plan either to any one  employee or in the  aggregate;  or (c) change the
class of  persons  eligible  to  receive  ISOs.  Notwithstanding  the  preceding
sentence,  the Board  shall in all events have the power and  authority  to make
such changes in the Plan and in the  regulations and  administrative  provisions
hereunder  or in any  outstanding  Option as, in the  opinion of counsel for the
Company,  may be necessary or appropriate from time to time to enable any Option
granted  pursuant to the Plan to qualify as an  incentive  stock  option or such
other stock  option as may be defined  under the Code,  as amended  from time to
time, so as to receive preferential federal income tax treatment.

         19.  EFFECTIVE DATE AND DURATION OF THE PLAN

         The Plan  shall  become  effective  and  shall be  deemed  to have been
adopted on November 5, 1997, unless the Plan shall have terminated earlier,  the
Plan shall terminate on the tenth (10th)  anniversary of its effective date, and
no Option  shall be granted  pursuant  to the Plan after the day  preceding  the
tenth (10th) anniversary of its effective date.

                                      -10-

<PAGE>



                       AMERICAN TOWER SYSTEMS CORPORATION

                             Stock Option Agreement
                             Option Certificate: No.

Specific Terms of the Option

         Subject to the terms and conditions hereinafter set forth and the terms
and conditions of the American Tower Systems  Corporation 1997 Stock Option Plan
(the "Plan"),  American Tower Systems  Corporation,  a Delaware corporation (the
"Company"  which  term  shall  include,  unless the  context  otherwise  clearly
requires,  all  Subsidiaries  [as  defined in the Plan] of the  Company)  hereby
grants the following  option to purchase shares of Common Stock,  par value $.01
per share (the "Stock") of the Company:

1.       Name of Person to Whom the Option is granted (the "Optionee"):

2.       Date of Grant of Option:

3.       Number of shares of Stock:

4.       Option Exercise Price (per share): $

5.       Term:  Subject to Section 10, this Option expires at 5:00 p.m.  Eastern
         Time on

6.       Exercisability:   Provided  that  on the  dates  set  forth  below  the
                           Optionee is still  employed by the Company or, if the
                           Optionee is not  employed by the Company the Optionee
                           is  still  actively   involved  in  the  Company  (as
                           determined by the  Committee)  the Option will become
                           exercisable  as follows  and as provided in Section 9
                           below:

         Date                             Number of Shares    Cumulative Number








American Tower Systems Corporation


By:__________________________                        X_______________________
   Title:____________________                         (Signature of Optionee)
                                                            Date:_______________

Optionee's Address:


                                                        

<PAGE>



OTHER TERMS OF THE OPTION

         WHEREAS,  the Board of Directors (the "Board") has authorized the grant
of stock  options upon certain  terms and  conditions  set forth in the Plan and
herein; and

         WHEREAS,  the Compensation  Committee (the  "Committee") has authorized
the grant of this stock option  pursuant and subject to the terms of the Plan, a
copy of which is available from the Company and is hereby incorporated herein;

         NOW,  THEREFORE,  in  consideration  of the  premises  and  the  mutual
covenants  and  agreements  herein  contained,  the  Company  and the  Optionee,
intending to be legally bound, covenant and agree as set forth on the first page
hereof and as follows:

         7. Grant.  Pursuant  and subject to the Plan,  the Company  does hereby
grant to the Optionee a stock option (the "Option") to purchase from the Company
the number of shares of Stock set forth in  Section 3 on the first  page  hereof
upon the terms  and  conditions  set  forth in the Plan and upon the  additional
terms  and   conditions   contained   herein.   This  Option  is  a  [incentive]
[nonqualified]  stock  option and [is] [is not]  intended to qualify for special
federal income tax treatment as an "incentive  stock option" pursuant to Section
422 of the Internal Revenue Code of 1986, as amended (the "Code").

         8. Option  Price.  This Option may be exercised at the option price per
share of Stock set  forth in  Section 4 on the first  page  hereof,  subject  to
adjustment as provided herein and in the Plan.

         9. Term and  Exercisability of Option.  This Option shall expire on the
date  determined  pursuant  to  Section  5 on first  page  hereof  and  shall be
exercisable  prior to that date in accordance with and subject to the conditions
set forth in the Plan and those  conditions,  if any,  set forth in Section 6 on
first page  hereof.  If before  this  Option  has been  exercised  in full,  the
Optionee  ceases to be an employee  of the  Company for any reason  other than a
termination  for a reason  specified in Section 16 of the Plan, the Optionee may
exercise this Option to the extent that he or she might have exercised it on the
date of termination of his or her employment,  but only during the period ending
on the earlier of (a) the date on which the Option  expires in  accordance  with
Section  5 of  this  Agreement  or (b)  three  (3)  months  after  the  date  of
termination  of the  Optionee's  employment  with the Company.  However,  if the
Optionee  dies  before the date of  expiration  of this  Option and while in the
employ  of the  Company  or during  the  three  month  period  described  in the
preceding  sentence,  or in the  event of the  retirement  of the  Optionee  for
reasons of  disability  (within  the meaning of Code ss.  22(e)(3)),  the Option
shall  terminate  only on such date of  expiration.  If the Optionee dies before
this Option has been  exercised  in full,  the  personal  representative  of the
Optionee may exercise this Option as set forth in the preceding sentence.

         10. Method of Exercise. To the extent that the right to purchase shares
of Stock has accrued  hereunder,  this Option may be exercised from time to time
by written notice to the Company  substantially  in the form attached  hereto as
Exhibit A,  stating  the number of shares  with  respect to which this Option is
being exercised,  and accompanied by payment in full of the option price for the
number of shares to be delivered,  by means of payment acceptable to the Company
in  accordance  with Section 10 of the Plan.  As soon as  practicable  after its
receipt of such notice, the Company

                                       -2-

<PAGE>



shall,  without  transfer or issue tax to the Optionee (or other person entitled
to exercise this Option),  deliver to the Optionee (or other person  entitled to
exercise this Option), at the principal executive offices of the Company or such
other place as shall be mutually  acceptable,  a certificate or certificates for
such shares out of  theretofore  authorized  but unissued  shares or  reacquired
shares of its Stock as the Company may elect;  provided,  however, that the time
of such  delivery  may be  postponed  by the  Company  for such period as may be
required  for it  with  reasonable  diligence  to  comply  with  any  applicable
requirements  of law.  Payment of the  option  price may be made in cash or cash
equivalents or, in accordance with the terms and conditions of Section 10 of the
Plan, (a) in whole or in part in shares of Common Stock of the Company,  whether
or not  through  the  attestation  procedure  in the  Plan,  or (b) in  part  by
promissory  note of the  Optionee  in the form  attached  hereto as  Exhibit  B;
provided, however, that the Board reserves the right upon receipt of any written
notice of exercise from the Optionee to require  payment in cash with respect to
the  shares  contemplated  in such  notice.  If the  Optionee  (or other  person
entitled to exercise this Option) fails to pay for and accept delivery of all of
the shares specified in such notice upon tender of delivery thereof,  his or her
right to exercise  this  Option with  respect to such shares not paid for may be
terminated by the Company.

         11.  Nonassignability  of  Option  Rights.  This  Option  shall  not be
assignable  or  transferable  by the  Optionee  except by will or by the laws of
descent and distribution.  During the life of the Optionee, this Option shall be
exercisable only by him or her.*

         12.  Compliance with Securities Act. The Company shall not be obligated
to sell or  issue  any  shares  of Stock or  other  securities  pursuant  to the
exercise  of this  Option  unless the shares of Stock or other  securities  with
respect to which this  Option is being  exercised  are at that time  effectively
registered  or exempt from  registration  under the  Securities  Act of 1933, as
amended,  and  applicable  state  securities  laws. In the event shares or other
securities shall be issued which shall not be so registered, the Optionee hereby
represents, warrants and agrees that he or she will receive such shares or other
securities for  investment and not with a view to their resale or  distribution,
and will execute an appropriate  investment  letter  satisfactory to the Company
and its counsel.

         13.  Legends.   The  Optionee  hereby   acknowledges   that  the  stock
certificate  or  certificates  evidencing  shares  of Stock or other  securities
issued  pursuant to any exercise of this Option will bear a legend setting forth
the restrictions on their transferability described in Section 13 hereof.

         14.  Rights as  Stockholder.  The  Optionee  shall  have no rights as a
stockholder with respect to any shares of Stock or other  securities  covered by
this Option until the date of issuance of a  certificate  to him or her for such
shares or other  securities.  No adjustment shall be made for dividends or other
rights for which the record date is prior to the date such stock  certificate is
issued.

         15.  Withholding  Taxes. The Optionee hereby agrees,  as a condition to
any exercise of this Option,  to provide to the Company an amount  sufficient to
satisfy  its  obligation  to  withhold  certain  federal,  state and local taxes
arising by reason of such exercise (the "Withholding Amount") by (a) authorizing
the  Company  to  withhold  the   Withholding   Amount  from  his  or  her  cash
compensation,
- --------
*        Use different language for an Option transferable to family members.

                                       -3-

<PAGE>



or (b)  remitting  the  Withholding  Amount to the  Company  in cash;  provided,
however,  that to the extent that the Withholding  Amount is not provided by one
or a  combination  of  such  methods,  the  Company  in its  sole  and  absolute
discretion  may refuse to issue such  shares of Stock or may  withhold  from the
shares of Stock  delivered  upon  exercise  of this Option that number of shares
having a fair market value, on the date of exercise, sufficient to eliminate any
deficiency in the Withholding Amount.

         16. Notice of Disqualifying Disposition. If this Option is an incentive
stock option,  the Optionee  agrees to notify the Company  promptly in the event
that he sells, transfers, exchanges or otherwise disposes of any shares of Stock
issued  upon  exercise  of the  Option,  before  the  later  of (i)  the  second
anniversary of the date of grant of the Option and (ii) the first anniversary of
the date the shares were issues upon his exercise of the Option.

         17.  Termination  or Amendment  of Plan.  The Board may in its sole and
absolute  discretion at ant time terminate or from time to time modify and amend
the  Plan,  but  no  such  termination  or  amendment  will  affect  rights  and
obligations under this Option.

         18. Effect Upon Employment. Nothing in this Option or the Plan shall be
construed to impose any  obligation  upon the Company to employ or retain in its
employ, or continue its involvement with, the Optionee.

         19. Time for Acceptance.  Unless the Optionee shall evidence his or her
acceptance of this Option by execution of this  Agreement  within seven (7) days
after its  delivery to him or her, the Option and this  Agreement  shall be null
and void.

         20.  General Provisions.

                  (a) Amendment;  Waivers.  This Agreement,  including the Plan,
contains the full and complete understanding and agreement of the parties hereto
as to the subject matter hereof and may not be modified or amended,  nor may any
provision hereof be waived, except by a further written agreement duly signed by
each of the parties. The waiver by either of the parties hereto of any provision
hereof in any  instance  shall not  operate  as a waiver of any other  provision
hereof or in any other instance.

                  (b) Binding Effect.  This Agreement shall inure to the benefit
of and be binding upon the parties hereto and, to the extent provided herein and
in the Plan, their respective heirs, executors, administrators, representatives,
successors and assigns.

                  (c)  Construction.  This  Agreement  is  to  be  construed  in
accordance with the terms of the Plan. In case of any conflict  between the Plan
and this Agreement,  the Plan shall control.  The titles of the sections of this
Agreement  and of the Plan are  included for  convenience  only and shall not be
construed as modifying or affecting their provisions. The masculine gender shall
include  both sexes;  the singular  shall  include the plural and the plural the
singular unless the context otherwise requires.


                                       -4-

<PAGE>



                  (d)  Governing  Law. This  Agreement  shall be governed by and
construed  and enforced in  accordance  with the  applicable  laws of the United
States of America  and the law (other  than the law  governing  conflict  of law
questions) of The Commonwealth of Massachusetts except to the extent the laws of
any other jurisdiction are mandatorily applicable.

                  (e)  Notices.  Any notice in  connection  with this  Agreement
shall be deemed to have  been  properly  delivered  if it is in  writing  and is
delivered in hand or sent by registered  mail to the party addressed as follows,
unless another address has been substituted by notice so given:

         To the Optionee:           To his or her address as
                                     listed on the books of the Company.

         To the Company:            American Tower Systems Corporation
                                    116 Huntington Avenue
                                    Boston, MA  02116
                                    Attention: Chief Financial Officer

                                    and

                                    Sullivan & Worcester LLP
                                    One Post Office Square
                                    Boston, MA  02109
                                    Attention:  Norman A. Bikales


                                       -5-

<PAGE>



                                                       Exhibit A to Stock Option

                       [FORM FOR EXERCISE OF STOCK OPTION]


American Tower Systems Corporation
116 Huntington Avenue
Boston, Massachusetts 02116


         RE:      Exercise of Option under  American  Tower Systems  Corporation
                  1997 Stock Option Plan

Gentlemen:

         Please take notice that the  undersigned  hereby elects to exercise the
stock option granted to ___________ (the "Employee") pursuant and subject to the
terms and conditions of the Stock Option Agreement  between the Employee and the
Company  dated as of , 199 (the  "Option  Agreement")  by and to the  extent  of
purchasing  shares  of  [Class A or Class B] Common  Stock,  par value  $.01 per
share,  of American  Tower Systems  Corporation  (the  "Company") for the option
price of $_____ per share.

         The undersigned  encloses  herewith  payment,  in cash or in such other
property as is permitted  under the Plan of the purchase  price for said shares.
If the  undersigned  is  making  payment  of any part of the  purchase  price by
delivery of shares of Common  Stock of the  Company,  he or she hereby  confirms
that  he or  she  has  investigated  and  considered  the  possible  income  tax
consequences to him or her of making such payments in that form. The undersigned
hereby  agrees to provide  the  Company  an amount  sufficient  to  satisfy  the
obligation of the Company to withhold  certain taxes,  as provided in Section 15
of the Option Agreement.

         The undersigned hereby specifically  confirms to American Tower Systems
Corporation  that he or she is acquiring said shares for investment and not with
a view to their sale or distribution, and that said shares shall be held subject
to all of the terms and conditions of said Stock Option Agreement.

                                              Very truly yours,

_____________________                         __________________________________
         Date                                 (Signed by the Employee or other
                                              party duly exercising option)


                                                       

<PAGE>



                                                       Exhibit B to Stock Option


           [FORM OF TERM NOTE IN PAYMENT OF EXERCISE PRICE OF OPTIONS]

                                 PROMISSORY NOTE


$_____________                                                  Date:__________


         FOR VALUE RECEIVED,  the  undersigned  (the "Payor") hereby promises to
pay to the order of American  Tower  Systems  Corporation  (the  "Payee") at the
principal office of Payee in Boston, Massachusetts ON DEMAND and in any event on
or before ___________19__ the sum of _______________________  ($_______________)
with interest  from the date hereof on the principal  amount hereof from time to
time  unpaid  at the rate of ___  percent  (___%)  per  annum.  Interest  on the
outstanding principal amount hereof shall be due and payable monthly on the last
business  day of each month in each year  during  the term of this Note,  and at
maturity  commencing with the month end  immediately  following the date of this
Note. The Payor  authorizes the Payee to withhold such interest from his regular
monthly or other salary payment or other compensation and to apply such withheld
amount to interest  due hereon and also agrees to execute such  instruments  and
other documents as the Payee may from time to time request to reflect such right
of withholding. [The Payor shall on ______ of each year, commencing in ____, pay
an amount equal to ____ percent (__%) of the original  principal  amount of this
Note, together with all accrued and unpaid interest thereon.]

         All payments on this Note shall be first  applied  against  accrued but
unpaid  interest to the extent thereof,  and then to the  outstanding  principal
amount.

         The Payor shall have the right to prepay the  principal  amount of this
Note in whole or in part at any time without penalty,  but together with all but
unpaid accrued interest on the outstanding  principal amount. No such prepayment
shall affect the  obligation  of the Payor to make the payments  required by the
last sentence of the first paragraph of this Note.

         Payor shall pay principal,  interest,  and other amounts under,  and in
accordance with the terms of, this Note, free and clear of and without deduction
for any and all present and future taxes, levies, imposts, deductions,  charges,
withholdings, and all liabilities with respect thereto, excluding taxes measured
by income.

         Should the  indebtedness  evidenced by this Note or any part thereof be
collected  by legal  action,  or in  bankruptcy,  receivership  or  other  court
proceedings,  or  should  this Note be  placed  in the  hands of  attorneys  for
collection  after  default,  Payor  agrees to pay,  upon  demand by  Holder,  in
addition to  principal  and  interest  and other sums,  if any,  due and payable
hereon,  court  costs  and  reasonable  attorneys'  fees  and  other  reasonable
collection charges, to the maximum extent permitted by applicable law.


                                                        

<PAGE>



         This  Note  represents  the  obligation  of  the  Payor  to  pay  on an
installment basis the balance of the purchase price of shares of Common Stock of
the  Payee to be  issued  to the  Payor  promptly  after  the date  hereof  (the
"Shares"),  plus  interest on such  purchase  price,  pursuant to a stock option
granted  pursuant  to the Stock  Option  Agreement  dated  _________,  199_ (the
"Agreement").

         Upon the  occurrence of any of the following  events (an  "acceleration
event"):

                  (a)  Failure of the Payor to  perform  or  observe  any of his
         obligations  under this Note or the Agreement,  or  acceleration of the
         payor's  obligation to make payment of the purchase price of the Shares
         pursuant to the provisions of the Agreement; or

                  (b)  Commencement  of voluntary or involuntary  proceedings in
         respect of the Payor under any federal or state bankruptcy, insolvency,
         receivership or other similar law; or

                  (c)  Termination of the Payor's employment by the Payee;

then,  and in any such  event,  the  holder  of this  Note at its  election  may
forthwith  declare  the  entire  principal  amount of this Note,  together  with
accrued  interest  thereon,  immediately  due and  payable,  and this Note shall
thereupon forthwith become so due and payable without  presentation,  protest or
further demand or notice of any kind, all of which are expressly waived.

         The Payor hereby waives the presentment,  demand, notice of protest and
all  other  demands  and  notices  in  connection  with  delivery,   acceptance,
performance,  default or enforcement hereof. No delay or omission on the part of
the holder of this Note in  exercising  any right  hereunder  shall operate as a
waiver  of such  right or of any other  right  hereunder,  no course of  dealing
between  the  Payor  and the  holder  shall  operate  as a waiver  of any of the
holder's  rights  hereunder  unless set forth in a writing signed by the holder,
and a waiver on any one occasion shall not be construed as a bar to or waiver of
any right on any future  occasion.  The Payor  further  agrees to pay the costs,
fees and expenses  (including  reasonable  attorneys'  fees) of  collection  and
enforcement of this Note.

         Any provision of this Note to the contrary notwithstanding,  changes in
or additions to this Note may be made,  or compliance  with any term,  covenant,
agreement,  condition  or  provision  set forth  herein may be omitted or waived
(either  generally  or in a  particular  instance  and either  retroactively  or
prospectively)  with, but only with, the consent in writing of Holder and Payor,
and each such  change,  addition  or waiver  shall be binding  upon each  future
holder of the Note and Payor.  Any consent may be given subject to  satisfaction
of conditions stated therein.

         This Note shall be binding  upon and shall  inure to the benefit of the
Payor and the Payee and their  respective  successors  and  assigns,  including,
without  limitation,  successors  by  operation  of law  pursuant to any merger,
consolidation or sale of assets involving any of the parties.

         This  Note  shall be  deemed  to be a  contract  made  under  and to be
construed in accordance  with and governed by the  applicable  law of the United
States of America  and the laws (other  than the law  governing  conflict of law
matters) of The Commonwealth of Massachusetts.


                                       -2-

<PAGE>



         If the last or  appointed  day for  taking of any  action  required  or
permitted hereby (other than the payment of principal of or interest or premium,
if any,  hereon)  shall be a  Saturday,  Sunday  or  legal  holiday  in  Boston,
Massachusetts,  or a day on which banking institutions in Boston,  Massachusetts
are authorized by law or executive order to close, then such action may be taken
on the next succeeding business day for banking institutions in such city.

         This  Note is  executed  as,  and  shall  be  effective  as,  a  sealed
instrument and shall be binding upon the estate and any successor of the Payor.


Witness:_________________________                  ____________________________
        Print Name:                                Print Name:





                                       -3-

<PAGE>


                                                       Exhibit C to Stock Option

                                ATTESTATION FORM

Pursuant  to the  Notice of  Exercise  submitted  herewith,  I have  elected  to
purchase  ________ shares of American Tower Systems  Corporation (the "Company")
[Class A or Class B]  Common  Stock at $____ per  share,  as stated in the Stock
Option  agreement dated  __________.  I hereby attest to ownership of the shares
under the  certificate(s)  listed below and hereby tender such shares in full or
partial payment of the total Option Price of $___________.

I also  certify  that I either  (i) have held the shares I am  tendering  for at
least one year after  acquiring  such shares  through the exercise of an ISO, or
(ii) have not obtained such shares through the exercise of an ISO.

Although  the  Company  has  not  required  me to  make  actual  delivery  of my
certificates, as a result of which I (and the joint owner, if any, of the shares
listed below) will retain  ownership of the shares, I represent that I, with the
consent of the joint  owner (if any) of the  shares,  have full power to deliver
and convey the  certificates  to the Company and therefore could have caused the
Company to become  sole owner of the shares.  The joint owner of the shares,  by
signing this form, consents to the above representations and the exercise of the
stock option by this notice.


<TABLE>
<CAPTION>
        [Class A or Class B]                   No. of Shares                  Acquired by                   Date of
            Common Stock                        Represented                  Stock Option                 Acquisition
           Certificate(s)                                                    Plan Exercise
                                                                               (Yes/No)
<S>                                       <C>                          <C>                             <C>

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

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

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

- ------------------------------------      -----------------------      -------------------------       -----------------
</TABLE>

You are hereby instructed to apply toward the Option Price: (Check one)

The maximum  number of whole shares  necessary to pay the Option  Price,  or, if
fewer, the total number of shares represented by the listed certificate(s), with
any remaining amount to be paid by check accompanying this Attestation Form.

_____________________ of the listed shares, with any remaining amount to be paid
by check accompanying this Attestation Form.

If I have paid only a portion of the total  Option  Price by  tendering  Company
[Class A or Class B] Common  Stock,  enclosed  herewith  is a check  payable  to
Company in the amount of $____________ for the balance of the Option Price.



                                       -4-

                                                                       EXHIBIT 5
                              SULLIVAN & WORCESTER LLP
                               ONE POST OFFICE SQUARE
                             BOSTON, MASSACHUSETTS 02109
                                   (617) 338-2800
                                FAX NO. 617-338-2880
     IN WASHINGTON, D.C.                                   IN NEW YORK CITY
1025 CONNECTICUT AVENUE, N.W.                              767 THIRD AVENUE
   WASHINGTON, D.C. 20036                              NEW YORK, NEW YORK 10017
       (202) 775-8190                                       (212) 486-8200
    FAX NO. 202-293-2275                                 FAX NO. 212-758-2151






                                                     May 5, 1998



American Radio Systems Corporation
116 Huntington Avenue
Boston, MA 02116

     Re:  Registration  Statement  on Form  S-8 of an  Aggregate  of  17,150,000
          Shares of Class A Common Stock and Class B Common Stock

Dear Sir or Madam:

         In connection with the  registration  under the Securities Act of 1933,
as amended (the  "Securities  Act"),  by American Tower Systems  Corporation,  a
Delaware corporation (the "Company"),  of an aggregate of 17,150,000 shares (the
"Registered  Shares") of its Class A Common Stock, par value $.01 per share (the
"Class A Common Stock") and Class B Common Stock,  par value $.01 per share (the
"Class B Common Stock") which underlie options that were, and will be, issued to
purchase  shares of Class A Common Stock and Class B Common Stock of the Company
pursuant to the American  Tower Systems  Corporation  1997 Stock Option Plan, as
Amended and  Restated on April 27, 1998 (as amended,  the  "Plan"),  and options
that were issued to purchase  shares of Class A Common  Stock and Class B Common
Stock of the Company  pursuant to the Exchanged  Option  Agreements with certain
named individuals (the "Exchanged Option Agreements"),  the following opinion is
furnished to you to be filed with the  Securities and Exchange  Commission  (the
"Commission") as Exhibit 5 to the Company's  registration  statement on Form S-8
(the "Registration Statement").

         We have  acted  as  counsel  to the  Company  in  connection  with  the
preparation of the  Registration  Statement,  and we have examined  originals or
copies,   certified  or  otherwise  identified  to  our  satisfaction,   of  the
Registration  Statement,  the  Restated  Certificate  of  Incorporation  of  the
Company,  as amended (the  "Restated  Certificates"),  the Plan,  the  Exchanged
Option Agreements,  corporate  records,  certificates and statements of officers
and accountants of the Company and of public officials, and such other documents
as we have considered  necessary in order to furnish the opinion hereinafter set
forth.  We  express no  opinion  herein as to any laws  other  than the  General
Corporation Law of the State of Delaware. We assume that the number and issuance
of  options  to be  offered  from  time to time  pursuant  to the Plan have been
determined and authorized by proper action of the Board of Directors, or a


<PAGE>


American Radio Systems Corporation
May 5, 1998
Page 2

committee thereof, of the Company and that the number,  issuance and sale of the
Registered  Shares to be offered  from time to time  pursuant to the exercise of
such options have been and will be determined  in  accordance  with the Restated
Certificate  and  applicable  Delaware Law. We further  assume that prior to the
issuance  of any  Registered  Shares,  there  will  exist,  under the  Company's
Restated Certificate,  the requisite number of authorized shares of common stock
for  such  issuance  which  are  unissued  and are not  otherwise  reserved  for
issuance.

         Based on and subject to the foregoing, we are of the opinion that, when
the  Registration  Statement has become effective under the Securities Act, upon
due  authorization  by the Board of Directors,  or a committee  thereof,  of the
Company of an issuance of an option  pursuant to the Plan,  and upon an issuance
by the Company of Registered  Shares pursuant to the exercise of such option and
upon delivery of certificates representing the Registered Shares against payment
therefor  in the  manner  contemplated  by the  Plan  and the  Exchanged  Option
Agreements,  the Registration  Statement and any applicable  amendment of either
thereof,  the Registered  Shares  represented by such  certificates will be duly
authorized, validly issued, fully paid and nonasseassable by the Company.

         We hereby  consent to the  filing of this  opinion as an exhibit to the
Registration  Statement. In giving such consent, we do not thereby admit that we
come within the category of persons whose consent is required under Section 7 of
the  Securities Act or the Rules and  Regulations of the Commission  promulgated
thereunder.

                                               Very truly yours,



                                               /s/ Sullivan & Worcester LLP
                                               SULLIVAN & WORCESTER LLP





                                                                    EXHIBIT 23.1


                          INDEPENDENT AUDITORS' CONSENT

         We consent  to the  incorporation  by  reference  in this  Registration
Statement of American Tower Systems  Corporation on Form S-8 of our report dated
March 6,  1998  (except  for Note 4, as to which  the date is March  27,  1998),
appearing  in  the  Annual  Report  on  Form  10-K  of  American  Tower  Systems
Corporation for the year ended December 31, 1997.

         We consent  to the  incorporation  by  reference  in this  Registration
Statement of American Tower Systems Corporation on Form S-8 of our report on the
financial  statements of OPM - USA - INC. dated March 2, 1998,  appearing in the
Current Report on Form 8-K of American Tower Systems  Corporation filed on March
20, 1998.

                                                       /s/ Deloitte & Touche LLP

DELOITTE & TOUCHE LLP
Boston, Massachusetts
May 5, 1998



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