AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JULY 1, 1998
 
                                                     REGISTRATION NO. 333-52481
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                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549
 
                               ----------------
 
                                   FORM S-1
                            REGISTRATION STATEMENT
                                     UNDER
                          THE SECURITIES ACT OF 1933
 
                               ----------------
 
                          AMERICAN TOWER CORPORATION
                 (FORMERLY AMERICAN TOWER SYSTEMS CORPORATION)
            (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
        DELAWARE                     4899                     65-072383
     (STATE OR OTHER           (PRIMARY STANDARD          (I.R.S. EMPLOYER
     JURISDICTION OF              INDUSTRIAL             IDENTIFICATION NO.)
    INCORPORATION OR          CLASSIFICATION CODE
      ORGANIZATION)                 NUMBER)
 
              116 HUNTINGTON AVENUE, BOSTON, MASSACHUSETTS 02116
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
 
                               ----------------
 
                                STEVEN B. DODGE
                          AMERICAN TOWER 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)
 
                               ----------------
 
                                  COPIES TO:
       NORMAN A. BIKALES, ESQ.                   JOHN T. BOSTELMAN, ESQ.
      SULLIVAN & WORCESTER LLP                     SULLIVAN & CROMWELL
       ONE POST OFFICE SQUARE                       125 BROAD STREET
     BOSTON, MASSACHUSETTS 02109                NEW YORK, NEW YORK 10004
 
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  Approximate date of commencement of proposed sale to the public: immediately
_______________________________________________________________________________
 
  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, check the following box. [_]
 
  If this form is filed pursuant to register additional securities for an
offering pursuant to Rule 462(b) under the Securities Act, check the following
box and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [X] Registration
Statement No. 333-52481
 
  If this form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]
 
  If this form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]
 
  If delivery of the prospectus is expected to be made pursuant to Rule 434,
check the following box. [_]
 
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                        CALCULATION OF REGISTRATION FEE
 
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                                               PROPOSED          PROPOSED
 TITLE OF EACH CLASS OF       AMOUNT            MAXIMUM           MAXIMUM
  SECURITIES TO BE REG-        TO BE        OFFERING PRICE       AGGREGATE         AMOUNT OF
         ISTERED            REGISTERED       PER SECURITY     OFFERING PRICE   REGISTRATION FEE
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Class A Common Stock,
 $.01 par value........      2,984,272          $23.50          $70,130,392         $20,689
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- ------------------------------------------------------------------------------- ---------------- - ------------------------------------------------------------------------------- - ------------------------------------------------------------------------------- EXPLANATORY STATEMENT This registration statement is being filed pursuant to Rule 462(b) and General Instruction V of Form S-1. The contents of Registration Statement No. 333-52481 are hereby incorporated by reference. EXHIBITS
EXHIBIT NO. DESCRIPTION OF DOCUMENT EXHIBIT FILE NO. ----------- ------------------------------------------------------- ------------------------ 5 Filed herewith as Opinion of Sullivan & Worcester LLP ................... Exhibit 5 23.0 Consents of Sullivan & Worcester LLP................... Contained in the opinion of Sullivan & Worcester LLP filed herewith as part of Exhibit 5 23.1 Filed herewith as Independent Auditor's Consents--Deloitte & Touche LLP.. Exhibit 23.1 23.2 Filed herewith as Consent of Pressman Ciocca Smith LLP................... Exhibit 23.2 23.3 Filed herewith as Consent of Rooney, Ida, Nolt & Ahern................... Exhibit 23.3 23.4 Filed herewith as Consent of KPMG Peat Marwick LLP....................... Exhibit 23.4 23.5 Filed herewith as Consent of Ernst & Young LLP........................... Exhibit 23.5 24 Powers of Attorney..................................... Incorporated by reference from Exhibit 5 of Registration Statement No. 333-52481
II-1 SIGNATURES Pursuant to the requirements of the Securities Act of 1933, the Company 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 1st day of July 1998. AMERICAN TOWER CORPORATION /s/ Steven B. Dodge* By: __________________________________ STEVEN B. DODGE CHAIRMAN OF THE BOARD, PRESIDENT AND CHIEF EXECUTIVE OFFICER SIGNATURE TITLE DATE /s/ Steven B. Dodge* Chairman, President, July 1, 1998 - -------------------------------- Chief Executive STEVEN B. DODGE Officer and Director /s/ Joseph L. Winn* Chief Financial Officer July 1, 1998 - -------------------------------- JOSEPH L. WINN /s/ Justin D. Benincasa Vice President and July 1, 1998 - -------------------------------- Corporate Controller JUSTIN D. BENINCASA *Individually and as Attorney-in-Fact /s/ Alan L. Box* Executive Vice July 1, 1998 - -------------------------------- President and Director ALAN L. BOX /s/ Arnold L. Chavkin* Director July 1, 1998 - -------------------------------- ARNOLD L. CHAVKIN /s/ J. Michael Gearon, Jr.* Executive Vice July 1, 1998 - -------------------------------- President and Director J. MICHAEL GEARON, JR. /s/ Thomas H. Stoner* Director July 1, 1998 - -------------------------------- THOMAS H. STONER /s/ Fred R. Lummis* Director July 1, 1998 - -------------------------------- FRED R. LUMMIS /s/ Randall Mays* Director July 1, 1998 - -------------------------------- RANDALL MAYS
II-2 EXHIBIT INDEX
EXHIBIT NO. DESCRIPTION OF DOCUMENT EXHIBIT FILE NO. PAGE ----------- ------------------------------------------------------- ------------------------ ---- 5 Filed herewith as Opinion of Sullivan & Worcester LLP ................... Exhibit 5 23.0 Consents of Sullivan & Worcester LLP................... Contained in the opinion of Sullivan & Worcester LLP filed herewith as part of Exhibit 5 23.1 Independent Auditor's Consents--Deloitte & Touche LLP.. Filed herewith as Exhibit 23.1 23.2 Consent of Pressman Ciocca Smith LLP................... Filed herewith as Exhibit 23.2 23.3 Consent of Rooney, Ida, Nolt & Ahern................... Filed herewith as Exhibit 23.3 23.4 Consent of KPMG Peat Marwick LLP....................... Filed herewith as Exhibit 23.4 23.5 Consent of Ernst & Young LLP........................... Filed herewith as Exhibit 23.5 24 Powers of Attorney..................................... Incorporated by reference from Exhibit 5 of Registration Statement No. 333-52481

                                                                       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
July 1, 1998 American Tower Corporation 116 Huntington Avenue Boston, Massachusetts 02116 Ladies and Gentlemen: In connection with the registration under the Securities Act of 1933, as amended (the "Securities Act"), by American Tower Corporation (formerly American Tower Systems Corporation), a Delaware Corporation ("American Tower"), of 31,736,898 shares (the "Shares") of its Class A Common Stock, par value $.01 per share (the "Class A Common Stock"), 27,861,987 of which Shares (including those of which may be issued pursuant to the over-allotment option contained in the Registration Statement hereinafter referred to) are to be offered by American Tower and 3,874,911 of which Shares are to be offered by the Selling Stockholders (described in the Registration Statement), the following opinion is furnished to you to be filed with the Securities and Exchange Commission (the "Commission") as Exhibit 5 to American Tower's registration statement on Form S- 1 (the "Registration Statement"). We have acted as counsel to American Tower 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, corporate records, certificates and statements of officers and accountants of American Tower, and of public officials, and such other documents as we have considered relevant and 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. The authorized capital stock of American Tower consists of 20,000,000 shares of preferred stock, par value $.01 per share (the "Preferred Stock"), the relative designations, preferences, rights and restrictions of which are to be designated from time to time by the Board of Directors of American Tower, 300,000,000 shares of Class A Common Stock, 50,000,000 shares of Class B Common Stock, par value $.01 per share, and 10,000,000 shares of Class C Common Stock, par value $.01 per share (collectively, the "Common Stock"). Based on and subject to the foregoing, we are of the opinion that: (a) the Shares have been duly and validly authorized by American Tower; (b) with respect to the Shares to be American Tower Corporation July 1, 1998 Page 2 offered by the Selling Stockholders, all necessary actions on the part of American Tower in connection with the issuance of said Shares have been taken and said Shares are validly issued, fully paid and non-assessable; and (c) with respect to the Shares to be offered by American Tower, all necessary actions on the part of American Tower in connection therewith have been taken and, upon delivery to the underwriters against payment therefor in accordance with the terms of the Underwriting Agreement to be entered into among American Tower, the Selling Stockholders, Credit Suisse First Boston Corporation, BT Alex. Brown Incorporated, Lehman Brothers Inc., Morgan Stanley & Co. Incorporated, Bear, Stearns & Co. Inc., Merrill Lynch, Pierce, Fenner & Smith Incorporated, and Smith Barney Inc., said Shares will be validly issued, fully paid and non- assessable. We hereby consent to the filing of this opinion as an exhibit to the Registration Statement and to the reference to our firm therein under the caption "Validity of the Shares." 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 under the Rules and Regulations of the Commission promulgated thereunder. Very truly yours, /s/ Sullivan & Worcester SULLIVAN & WORCESTER LLP

 
                                                                  EXHIBIT 23.1A
 
             INDEPENDENT AUDITORS' CONSENT AND REPORT ON SCHEDULES
 
To the Board of Directors of
 American Tower Corporation
 
  We consent to the use in this Registration Statement of American Tower
Corporation (formerly American Tower Systems Corporation) on Form S-1, filed
pursuant to Regulation 462(b), of our report dated March 6, 1998 (March 27,
1998 as to the sixth paragraph of Note 1 and the second paragraph of Note 4),
appearing in the Prospectus included in Amendment No. 3 to Registration
Statement No. 333-52481 of American Tower Corporation on Form S-1, which is
incorporated into this Registration Statement, and to the reference to us
under the heading "Experts" in such Prospectus.
 
  Our audits of the consolidated financial statements referred to in our
aforementioned report also included the financial statement schedules of
American Tower Systems Corporation, listed in Item 16 to Registration
Statement No. 333-52481. These financial statement schedules are the
responsibility of the Company's management. Our responsibility is to express
an opinion based on our audits. In our opinion, such financial statement
schedules, when considered in relation to the basic consolidated financial
statements taken as a whole, present fairly in all material respects the
information set forth therein.
 
                                          /s/ Deloitte & Touche LLP
 
Deloittte & Touche LLP
Boston, Massachusetts
July 1, 1998

 
                                                                  EXHIBIT 23.1B
 
                         INDEPENDENT AUDITORS' CONSENT
 
  We consent to the use in this Registration Statement of American Tower
Corporation (formerly American Tower Systems Corporation) on Form S-1, filed
pursuant to Regulation 462(b), of our report on the financial statements of
Diablo Communications, Inc. dated November 4, 1997, appearing in the
Prospectus included in Amendment No. 3 to Registration Statement No. 333-52481
of American Tower Corporation on Form S-1, which is incorporated into this
Registration Statement.
 
  We also consent to the reference to us under the heading "Experts" in such
Prospectus.
 
                                          /s/ Deloitte & Touche LLP
 
Deloitte & Touche LLP
San Francisco, California
July 1, 1998

 
                                                                  EXHIBIT 23.1C
 
                         INDEPENDENT AUDITORS' CONSENT
 
  We consent to the use in this Registration Statement of American Tower
Corporation (formerly American Tower Systems Corporation) on Form S-1, filed
pursuant to Regulation 462(b), of our report on the financial statements of
Meridian Communications dated October 31, 1997, appearing in the Prospectus
included in Amendment No. 3 to Registration Statement No. 333-52481 of
American Tower Corporation on Form S-1, which is incorporated into this
Registration Statement.
 
  We also consent to the reference to us under the heading "Experts" in such
Prospectus.
 
                                          /s/ Deloitte & Touche LLP
 
Deloitte & Touche LLP
Long Beach, California
July 1, 1998

 
                                                                  EXHIBIT 23.1D
 
                         INDEPENDENT AUDITORS' CONSENT
 
  We consent to the use in this Registration Statement of American Tower
Corporation (formerly American Tower Systems Corporation) on Form S-1, filed
pursuant to Regulation 462(b), of our report on the financial statements of
Gearon & Co., Inc. dated February 27, 1998, appearing in the Prospectus
included in Amendment No. 3 to Registration Statement No. 333-52481 of
American Tower Corporation on Form S-1, which is incorporated into this
Registration Statement.
 
  We also consent to the reference to us under the heading "Experts" in such
Prospectus.
 
                                          /s/ Deloitte & Touche LLP
 
Deloitte & Touche LLP
Atlanta, Georgia
July 1, 1998

 
                                                                  EXHIBIT 23.1E
 
                         INDEPENDENT AUDITORS' CONSENT
 
  We consent to the use in this Registration Statement of American Tower
Corporation (formerly American Tower Systems Corporation) on Form S-1, filed
pursuant to Regulation 462(b), of our report on the financial statements of
OPM-USA-INC. dated March 2, 1998, appearing in the Prospectus included in
Amendment No. 3 to Registration Statement No. 333-52481 of American Tower
Corporation on Form S-1, which is incorporated into this Registration
Statement.
 
  We also consent to the reference to us under the heading "Experts" in such
Prospectus.
 
                                          /s/ Deloitte & Touche LLP
 
Deloitte & Touche LLP
Boston, Massachusetts
July 1, 1998

 
                                                                   EXHIBIT 23.2
 
                         INDEPENDENT AUDITORS' CONSENT
 
  We consent to the use in this Registration Statement of American Tower
Corporation (formerly American Tower Systems Corporation) on Form S-1, filed
pursuant to Regulation 462(b), of our report on the financial statements of
MicroNet, Inc. and affiliates sold to American Towers Systems, Inc. dated
February 26, 1998, appearing in the Prospectus included in Amendment No. 3 to
Registration Statement No. 333-52481 of American Tower Corporation on Form S-
1, which is incorporated into this Registration Statement.
 
  We also consent to the reference to us under the heading "Experts" in such
Prospectus.
 
Pressman Ciocca Smith LLP
Hatboro, Pennsylvania
July 1, 1998
 
                                       1

 
                                                                   EXHIBIT 23.3
 
                         INDEPENDENT AUDITORS' CONSENT
 
  We consent to the use in this Registration Statement of American Tower
Corporation (formerly American Tower Systems Corporation) on Form S-1, filed
pursuant to Regulation 462(b), of our report on the financial statements of
Diablo Communications of Southern California, Inc. dated February 7, 1997 and
October 22, 1997 as to note 9 to the financial statements, appearing in the
Prospectus included in Amendment No. 3 to Registration Statement No. 333-52481
of American Tower Corporation on Form S-1, which is incorporated into this
Registration Statement.
 
  We also consent to the reference to us under the heading "Experts" in such
Prospectus.
 
                                          Rooney, Ida, Nolt & Ahern
                                          Certified Public Accountants
 
Oakland, California
July 1, 1998

 
                                                                   EXHIBIT 23.4
 
The Board of Directors
American Tower Corporation
 
We consent to the use of our report dated January 23, 1998, related to the
consolidated financial statements of the former American Tower Corporation and
Subsidiaries as of December 31, 1997 and 1996 and for each of the years in the
three year period ended December 31, 1997, included in Amendment No. 3 to
Registration Statement No. 333-52481 of American Tower Corporation on Form S-
1, which is incorporated into this Registration Statement. We also consent to
the reference to our firm under the heading "Experts" in the Registration
Statement.
 
                                     /s/ KPMG Peat Marwick LLP
 
Houston, Texas
July 1, 1998

 
                                                                   EXHIBIT 23.5
 
                        CONSENT OF INDEPENDENT AUDITORS
 
We consent to the use in this Registration Statement of American Tower
Corporation (formerly American Tower Systems Corporation) on Form S-1, filed
pursuant to Regulation 462(b), of our report dated January 13, 1998 (except
Note 7, as to which the date is January 27, 1998), with respect to the
financial statements of Tucson Communications Company appearing in the
Prospectus included in Amendment No. 3 to Registration Statement No. 333-52481
of American Tower Corporation on Form S-1, which is incorporated by reference
into this Registration Statement.
 
We also consent to the reference to our firm under the caption "Experts" in
such Prospectus.
 
                                          /s/ Ernst & Young LLP
 
San Diego, California
June 29, 1998