EXHIBIT 99.1

                       [American Tower Corporation logo]


                                                         ATC Contact: Anne Alter
                                                  Director of Investor Relations
                                                       Telephone: (617) 375-7500
FOR IMMEDIATE RELEASE

    American Tower Corporation Announces Proposal to Issue Private Placements

Boston,  Massachusetts - September 21, 1999 - American Tower Corporation  (NYSE:
AMT)  announced  today that it  proposes  to issue  private  placements  of $250
million of Convertible  Notes due 2009 with an option to issue an additional $50
million  principal  amount of Notes (the  "Standard  Notes") and $350 million of
Convertible  Notes due 2009 with an option to issue an  additional  $35  million
principal amount of Notes (the "Discount Notes").

The Standard and Discount  Notes will be  convertible to Class A Common Stock at
the option of the holder at a price to be  determined.  The  Company  expects to
complete the issuance of the private placements in September, 1999.

The Notes have not been registered under the Securities Act of 1933, as amended,
or under applicable state securities laws, and unless so registered,  may not be
offered or sold in the United States, except pursuant to an applicable exemption
from the registration  requirement of the Securities Act of 1933 as amended, and
applicable state securities laws.

This press release shall not constitute an offer to sell or the  solicitation of
an offer to buy the Notes. This press release is being issued pursuant to and in
accordance with Rule 135c under the Securities Act of 1933, as amended.

American  Tower is the leading  independent  owner,  operator  and  developer of
broadcast and wireless  communications sites in North America.  Giving effect to
pending transactions,  American Tower operates approximately 9,400 towers in the
United States and Mexico,  including  more than 8,300 owned or leased towers and
over  1,100  managed  sites.  Giving  effect to pending  transactions,  American
Tower's  portfolio  includes  over 195  broadcast  tower  sites in the U.S.  and
approximately  200 broadcast  tower sites in Mexico.  Based in Boston,  American
Tower has a U.S.  footprint  of  approximately  9,200 sites,  with  regional hub
offices in Boston,  Atlanta,  Chicago,  Houston and San  Francisco.  Through its
wholly owned  subsidiary,  ATC  Teleports,  Inc.,  American  Tower also owns and
operates, giving effect to pending transactions,  over 110 satellite antennas in
various locations across the United States.  For more information about American
Tower   Corporation   and  ATC   Teleports,   please   visit   our   web   sites
www.americantower.com and www.atcteleports.com.

This press  release  contains  "forward-looking  statements"  concerning  future
expectations,   plans  or  strategies   that  involve  a  number  of  risks  and
uncertainties.  The Company wishes to caution  readers that certain  factors may
have  affected  the  Company's  actual  results  and  could  cause  results  for
subsequent   periods  to  differ   materially   from  those   expressed  in  any
forward-looking  statement  made by or on behalf of the  Company.  Such  factors
include,  but  are not  limited  to (i)  substantial  capital  requirements  and
leverage   principally  as  a  consequence  of  its  ongoing   acquisitions  and
construction activities,  (ii) dependence on demand for wireless communications,
use of satellites for internet data transmission,  and implementation of digital
television,  (iii) the success of the Company's tower  construction  program and
(iv)  the  successful   operational   integration  of  the  Company's   business
acquisitions.  The Company  undertakes no  obligation to update  forward-looking
statements to reflect subsequently occurring events or circumstances.

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American Tower Corporation          116 Huntington Avenue, Boston, Massachusetts
(617) 375-7500  FAX (617) 375-7575                         www.americantower.com