- -------------------------------------------------------------------------------
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                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

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

                                   Form 10-Q

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

(Mark One):

[X] Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange
    Act of 1934. For the quarterly period ended June 30, 2001.

[_] Transition report pursuant to Section 13 or 15(d) of the Securities
    Exchange Act of 1934.

                       Commission File Number: 001-14195

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

                          American Tower Corporation
            (Exact name of registrant as specified in its charter)

              Delaware                                 65-0723837
   (State or other jurisdiction of                  (I.R.S. Employer
   Incorporation or Organization)                  Identification No.)

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

                        Telephone Number (617) 375-7500
             (Registrant's telephone number, including area code)

  Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to
such filing requirements for the past 90 days: Yes [X] No [_]



                                                                     Outstanding
                                                                         at
                                                                      August 1,
Class of Common Stock                                                   2001
- ---------------------                                                -----------
                                                                  
Class A Common Stock................................................ 180,854,646
Class B Common Stock................................................   8,001,769
Class C Common Stock................................................   2,267,813
                                                                     -----------
  Total............................................................. 191,124,228
                                                                     ===========


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


                           AMERICAN TOWER CORPORATION

                                     INDEX



                                                                         Page No.
                                                                         --------
                                                                      
                     PART I. FINANCIAL INFORMATION

Item 1. Unaudited Condensed Consolidated Financial Statements

    Condensed Consolidated Balance Sheets as of June 30, 2001 and
     December 31, 2000.................................................      1
    Condensed Consolidated Statements of Operations for the three and
     six months ended June 30, 2001 and 2000...........................      2
    Condensed Consolidated Statements of Cash Flows for the six months
     ended June 30, 2001 and 2000......................................      3
    Notes to Condensed Consolidated Financial Statements...............      4

Item 2. Management's Discussion and Analysis of Financial Condition and
 Results of Operations.................................................     11

Item 3. Quantitative and Qualitative Disclosures about Market Risk.....     28

                      PART II. OTHER INFORMATION

Item 1. Legal Proceedings..............................................     30

Item 2. Changes in Securities and Use of Proceeds......................     30

Item 4. Submission of Matters to a Vote of Security Holders............     30

Item 5. Other Information..............................................     31

Item 6. Exhibits and Reports on Form 8-K...............................     32

Signatures.............................................................     33



                         PART I. FINANCIAL INFORMATION

ITEM 1. UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

                  AMERICAN TOWER CORPORATION AND SUBSIDIARIES

               CONDENSED CONSOLIDATED BALANCE SHEETS--(Unaudited)
                       (In Thousands, Except Share Data)



                                                         June 30,   December 31,
                                                           2001         2000
                                                        ----------  ------------
                                                              
ASSETS
CURRENT ASSETS:
 Cash and cash equivalents............................  $  440,842   $   82,038
 Restricted cash and investments......................     119,757       46,036
 Short-term investments...............................     114,723
 Accounts receivable, net of allowance for doubtful
  accounts of $28,450 and $19,809, respectively.......     197,842      194,011
 Prepaid and other current assets.....................      64,442       42,377
 Inventories..........................................      61,401       47,872
 Cost and earnings in excess of billings on
  uncompleted contracts and unbilled receivables......      56,057       43,652
 Deferred income taxes................................      15,175       15,166
                                                        ----------   ----------
   Total current assets...............................   1,070,239      471,152
                                                        ----------   ----------
Property and equipment, net...........................   2,912,155    2,296,670
Goodwill and other intangible assets, net.............   2,565,633    2,505,681
Deferred income taxes.................................     198,708      140,395
Other long-term assets................................     255,663      246,781
                                                        ----------   ----------
     Total............................................  $7,002,398   $5,660,679
                                                        ==========   ==========
LIABILITIES AND STOCKHOLDERS' EQUITY
CURRENT LIABILITIES:
 Current portion of long-term obligations.............  $   10,921   $   11,178
 Accounts payable and accrued expenses................     154,431      161,337
 Accrued tower construction costs.....................      27,251       45,315
 Accrued interest.....................................      65,877       31,708
 Billings in excess of costs on uncompleted contracts
  and unearned revenue................................      54,340       48,248
                                                        ----------   ----------
   Total current liabilities..........................     312,820      297,786
                                                        ----------   ----------
Long-term obligations.................................   3,579,567    2,457,045
Other long-term liabilities...........................      41,753       12,472
                                                        ----------   ----------
   Total liabilities..................................   3,934,140    2,767,303
                                                        ----------   ----------
Minority interest in subsidiaries.....................       6,015       16,346
                                                        ----------   ----------
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY:
 Preferred Stock; $0.01 par value; 20,000,000 shares
  authorized; no shares issued or outstanding.........
 Class A Common Stock; $0.01 par value; 500,000,000
  shares authorized; 180,982,577 and 170,180,549
  shares issued, 180,837,980 and 170,035,952 shares
  outstanding, respectively...........................       1,810        1,701
 Class B Common Stock; $0.01 par value; 50,000,000
  shares authorized; 8,018,435 and 8,095,005 shares
  issued and outstanding, respectively................          80           81
 Class C Common Stock; $0.01 par value; 10,000,000
  shares authorized; 2,267,813 shares issued and
  outstanding.........................................          23           23
 Additional paid-in capital...........................   3,551,063    3,174,622
 Accumulated other comprehensive loss.................     (15,889)
 Accumulated deficit..................................    (470,504)    (295,057)
 Less: Treasury stock (144,597 shares at cost)........      (4,340)      (4,340)
                                                        ----------   ----------
   Total stockholders' equity.........................   3,062,243    2,877,030
                                                        ----------   ----------
     Total............................................  $7,002,398   $5,660,679
                                                        ==========   ==========

           See notes to condensed consolidated financial statements.

                                       1


                  AMERICAN TOWER CORPORATION AND SUBSIDIARIES

           CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS--Unaudited
                     (In Thousands, Except Per Share Data)



                                     Three Months Ended    Six Months Ended
                                          June 30,             June 30,
                                     -------------------  --------------------
                                       2001       2000      2001       2000
                                     ---------  --------  ---------  ---------
                                                         
REVENUES:
  Rental and management............. $ 106,493  $ 63,233  $ 197,704  $ 116,940
  Network development services......   100,429    74,026    206,943    112,178
  Satellite and fiber network access
   services.........................    56,046    29,788    120,789     53,446
                                     ---------  --------  ---------  ---------
      Total operating revenues......   262,968   167,047    525,436    282,564
                                     ---------  --------  ---------  ---------
OPERATING EXPENSES:
  Operating expenses excluding
     depreciation and amortization,
     development and corporate
     general and administrative
     expenses:
    Rental and management...........    51,547    31,290     97,137     59,782
    Network development services....    88,083    65,127    184,581     97,327
    Satellite and fiber network
     access services................    57,801    23,242    114,114     42,258
  Depreciation and amortization.....   103,956    67,093    198,955    122,291
  Development expense...............     2,557     4,196      5,302      5,184
  Corporate general and
   administrative expense...........     6,407     3,084     11,534      6,515
                                     ---------  --------  ---------  ---------
      Total operating expenses......   310,351   194,032    611,623    333,357
                                     ---------  --------  ---------  ---------
LOSS FROM OPERATIONS................   (47,383)  (26,985)   (86,187)   (50,793)
                                     ---------  --------  ---------  ---------
OTHER INCOME (EXPENSE):
  Interest expense..................   (70,061)  (38,437)  (136,740)   (70,587)
  Interest income and other, net....     4,451     3,851     12,858      6,437
  Interest income, TV Azteca, net...     3,582     3,155      7,120      5,463
  Loss on investment in US
   Wireless.........................   (22,226)             (22,226)
  Note conversion expense...........             (16,968)              (16,968)
  Minority interest in net
   (earnings) losses of
   subsidiaries.....................        61       (22)         3        (58)
                                     ---------  --------  ---------  ---------
      Total other expense...........   (84,193)  (48,421)  (138,985)   (75,713)
                                     ---------  --------  ---------  ---------
LOSS BEFORE INCOME TAXES AND EX-
 TRAORDINARY LOSSES.................  (131,576)  (75,406)  (225,172)  (126,506)
INCOME TAX BENEFIT..................    27,636    16,774     49,725     30,214
                                     ---------  --------  ---------  ---------
LOSS BEFORE EXTRAORDINARY LOSSES....  (103,940)  (58,632)  (175,447)   (96,292)
EXTRAORDINARY LOSSES ON
 EXTINGUISHMENT OF DEBT,
 NET OF INCOME TAX BENEFIT OF
 $2,892.............................                                    (4,338)
                                     ---------  --------  ---------  ---------
NET LOSS............................ $(103,940) $(58,632) $(175,447) $(100,630)
                                     =========  ========  =========  =========
BASIC AND DILUTED LOSS PER COMMON
 SHARE AMOUNTS
  Loss before extraordinary losses.. $   (0.54) $  (0.36) $   (0.93) $   (0.60)
  Extraordinary losses..............                                     (0.03)
                                     ---------  --------  ---------  ---------
NET LOSS............................ $   (0.54) $  (0.36) $   (0.93) $   (0.63)
                                     =========  ========  =========  =========
WEIGHTED AVERAGE COMMON SHARES OUT-
 STANDING...........................   190,755   161,021    188,976    158,768
                                     =========  ========  =========  =========


           See notes to condensed consolidated financial statements.

                                       2


                  AMERICAN TOWER CORPORATION AND SUBSIDIARIES

           CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS--Unaudited
                                 (In Thousands)



                                                           Six Months Ended
                                                               June 30,
                                                         ---------------------
                                                           2001        2000
                                                         ---------  ----------
                                                              
CASH FLOWS USED FOR OPERATING ACTIVITIES
  Net loss.............................................. $(175,447) $ (100,630)
  Non-cash items reflected in statement of operations
   (primarily depreciation and amortization)............   193,400     108,622
  Increase in current assets............................   (53,142)   (114,629)
  Increase in current liabilities.......................       294      63,929
                                                         ---------  ----------
Cash used for operating activities......................   (34,895)    (42,708)
                                                         ---------  ----------
CASH FLOWS USED FOR INVESTING ACTIVITIES:
  Payments for purchase of property and equipment and
   construction activities..............................  (301,435)   (196,151)
  Payments for acquisitions, net of cash acquired.......  (505,823) (1,005,206)
  Deposits, investments and other.......................  (145,647)    (87,931)
                                                         ---------  ----------
Cash used for investing activities......................  (952,905) (1,289,288)
                                                         ---------  ----------

CASH FLOWS FROM FINANCING ACTIVITIES:
  Borrowings under credit facilities....................   165,000   1,377,500
  Proceeds from senior notes offering................... 1,000,000
  Proceeds from convertible notes offering..............               450,000
  Repayment of notes payable and credit facilities......   (75,181)   (495,829)
  Net proceeds from equity offerings and stock options..   365,684     531,054
  Deferred financing costs, restricted cash and
   investments and other................................  (108,899)    (37,183)
                                                         ---------  ----------
Cash provided by financing activities................... 1,346,604   1,825,542
                                                         ---------  ----------

NET INCREASE IN CASH AND CASH EQUIVALENTS...............   358,804     493,546
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD..........    82,038      25,212
                                                         ---------  ----------

CASH AND CASH EQUIVALENTS, END OF PERIOD................ $ 440,842  $  518,758
                                                         =========  ==========

CASH PAID FOR INCOME TAXES.............................. $   1,699  $    1,271
                                                         =========  ==========
CASH PAID FOR INTEREST.................................. $ 110,494  $   45,664
                                                         =========  ==========

NON-CASH TRANSACTIONS:
  Issuance of common stock, warrants and options for
   acquisitions......................................... $   7,077  $  119,197
  Treasury stock transactions...........................                 2,752
  Note conversion transaction...........................               153,368
  TV Azteca transaction.................................                25,819
  Capital leases........................................    28,339       3,448
  Note receivable converted to investment...............     7,687


           See notes to condensed consolidated financial statements.

                                       3


                  AMERICAN TOWER CORPORATION AND SUBSIDIARIES

        NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS--Unaudited

1. Basis of Presentation and Accounting Policies
  The accompanying condensed consolidated financial statements have been
prepared by American Tower Corporation (the Company) without audit, pursuant
to the rules and regulations of the Securities and Exchange Commission (SEC).
The financial information included herein is unaudited; however, the Company
believes such information and the disclosures are adequate to make the
information presented not misleading and reflect all adjustments (consisting
only of normal recurring adjustments) that are necessary for a fair
presentation of financial position and results of operations for such periods.
Results of interim periods may not be indicative of results for the full year.
These condensed consolidated financial statements and related notes should be
read in conjunction with the Company's 2000 Annual Report on Form 10-K.

  Use of Estimates--The preparation of financial statements in conformity with
generally accepted accounting principles requires management to make estimates
and assumptions that affect the amounts reported in the condensed consolidated
financial statements and accompanying notes. Actual results may differ from
those estimates, and such differences could be material to the accompanying
condensed consolidated financial statements.

  Loss Per Common Share--Basic and diluted loss per common share has been
computed by dividing the Company's net loss by the weighted average number of
common shares outstanding during the period. Diluted per share amounts are
computed by adjusting the weighted average number of common shares for
dilutive potential common shares outstanding during the period, if any. In
computing diluted per share amounts, the Company uses the treasury stock
method, whereby unexercised options and warrants are assumed to be exercised
at the beginning of the period or at issuance, if later. The assumed proceeds
are then used to purchase common shares at the average market price during the
period. Shares issuable upon exercise of options, warrants and other dilutive
securities have been excluded from the computation of diluted loss per common
share as the effect is anti-dilutive. Had options, warrants and other dilutive
securities been included in the computation, weighted average shares for the
diluted computation would have increased by approximately 32.5 million and
42.3 million for the three months ended June 30, 2001 and 2000, respectively,
and 34.2 million and 41.6 million for the six months ended June 30, 2001 and
2000, respectively.

  Short-Term Investments--Amounts included in short-term investments include
commercial paper, certificates of deposit and marketable debt securities with
maturity dates in excess of three-months from the date of purchase. Commercial
paper, certificates of deposit and marketable debt securities that the Company
has the positive intent and ability to hold to maturity are classified as
"held-to-maturity" and reported at cost. Marketable debt securities that are
not classified as held-to-maturity are classified as "available-for-sale" and
reported at fair value, with unrealized gains and losses excluded from
earnings and reported as a separate component of other comprehensive income.

  Recent Accounting Pronouncements--On January 1, 2001, the Company adopted
the provisions of SFAS No. 133 "Accounting for Derivative Instruments and
Hedging Activities". This statement establishes accounting and reporting
standards for derivative instruments. Specifically, it requires that an entity
recognize all derivatives as either assets or liabilities on the balance sheet
at fair value. The accounting for changes in the fair market value of a
derivative (that is unrealized gains or losses) is recorded as a component of
an entity's net income or other comprehensive income, depending upon
designation (as defined in the statement). Such adoption resulted in a charge
to other comprehensive income of $7.9 million, net of tax, from the cumulative
effect of adopting this standard.

  The Company is exposed to interest rate risk relating to variable interest
rates on its credit facilities. As part of its overall strategy to manage the
level of exposure to the risk of interest rate fluctuations, the Company uses
interest rate swaps, caps and collars, which qualify and are designated as
cash flow hedges. The Company also uses swaptions to manage interest rate
risk, which have not been designated as cash flow hedges.

  During the six months ended June 30, 2001, the Company recorded an
unrealized loss, excluding the charge for the cumulative effect of adopting
SFAS No. 133, of approximately $7.9 million (net of a tax benefit of

                                       4


                  AMERICAN TOWER CORPORATION AND SUBSIDIARIES

 NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS--Unaudited--(Continued)

approximately $4.2 million) in other comprehensive loss for the change in fair
value of cash flows hedges and amounts reclassifed into results of operations.
Hedge ineffectiveness resulted in a loss of approximately $1.0 million for the
six months ended June 30, 2001 and was recorded in "interest income and other,
net". The Company records the changes in fair value of its derivative
instruments that are not accounted for as hedges in "interest income and
other, net". At June 30, 2001 the fair value of the Company's derivative
instruments represented a liability of approximately $25.8 million and is
included in "other long-term liabilities". The Company estimates that
approximately $7.0 million of net derivative losses included in other
comprehensive loss will be reclassified into the statement of operations
within the next twelve months.

  In June 2001, SFAS No. 141, "Business Combinations" was approved by the
Financial Accounting Standards Board (FASB). SFAS No.141 requires that the
purchase method of accounting be used for all business combinations initiated
after June 30, 2001. Goodwill and certain intangible assets will remain on the
balance sheet and not be amortized. On an annual basis, and when there is
reason to suspect that their values have been diminished or impaired, these
assets must be tested for impairment, and write-downs may be necessary. The
Company has not determined the impact, if any, that this statement will have
on its consolidated financial position or results of operations.

  In June 2001, SFAS No. 142, "Goodwill and Other intangible Assets" was
approved by the FASB. SFAS No. 142 changes the accounting for goodwill from an
amortization method to an impairment-only approach. Amortization of goodwill,
including goodwill recorded in past business combinations, will cease upon
adoption of this statement. The Company is required to implement SFAS No. 142
on January 1, 2002 and it has not determined the impact that this statement
will have on its consolidated financial position or results of operations.

  Reclassifications--Certain reclassifications have been made to the 2000
condensed consolidated financial statements and related notes to conform to
the 2001 presentation.

2. Income Taxes

  The Company provides for income taxes at the end of each interim period
based on the estimated effective tax rate for the full fiscal year. Cumulative
adjustments to the Company's estimate are recorded in the interim period in
which a change in the estimated annual effective rate is determined.

3. Inventories

  Inventories are stated at the lower of cost or market, with cost being
determined on the first-in, first-out (FIFO) basis. The components of
inventories are as follows (in thousands):



                                                 June 30, 2001 December 31, 2000
                                                 ------------- -----------------
                                                         
Finished goods..................................   $ 35,392         $25,947
Raw materials...................................     23,378          20,887
Work in process.................................      2,631           1,038
                                                   --------         -------
  Total.........................................   $ 61,401         $47,872
                                                   ========         =======


4. Acquisitions

  General--The acquisitions consummated during the six month period ended June
30, 2001 have been accounted for by the purchase method of accounting. The
purchase prices have been allocated to the net assets acquired, principally
intangible and tangible assets, and the liabilities assumed based on their
estimated fair values at the date of acquisition. The excess of purchase price
over the estimated fair value of the net assets

                                       5


                  AMERICAN TOWER CORPORATION AND SUBSIDIARIES

 NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS--Unaudited--(Continued)

acquired has been recorded as goodwill and other intangible assets. For
certain acquisitions, the condensed consolidated financial statements reflect
the preliminary allocation of purchase prices, as the appraisals of assets
acquired have not been finalized. The Company does not expect any changes in
depreciation and amortization as a result of such appraisals to be material to
the Company's consolidated results of operations.

  During the six month period ended June 30, 2001, the Company acquired
various communication sites and related businesses and satellite and fiber
network access service assets for an aggregate preliminary purchase price of
approximately $512.3 million. The total purchase price includes the payment of
$505.2 million in cash and the issuance of 342,069 shares of Class A common
stock valued at approximately $7.1 million. Included in the above are amounts
paid by the Company in connection with our agreement with ALLTEL. The
following summarizes the ALLTEL transaction to date.

  ALLTEL transaction--In December 2000, the Company entered into an agreement
to acquire the rights from ALLTEL to up to 2,193 communications towers through
a fifteen-year sublease agreement. Under the agreement, the Company will
sublease these towers for cash consideration of up to $657.9 million. ALLTEL
also granted the Company the option to sublease approximately 200 additional
towers (to be selected by the Company on a site-by-site basis) for cash
consideration of up to $300,000 per tower. Under the agreement, the Company
has the option to purchase the towers at the end of the fifteen-year term. In
the second quarter of 2001, the Company subleased 869 towers and paid ALLTEL
$260.7 million in cash. In addition, early in the third quarter, the Company
subleased 435 towers and paid ALLTEL $130.5 million in cash. The remaining
closings are expected to occur during the balance of 2001.

  The following unaudited pro forma summary for the six months ended June 30,
2001 and 2000 presents the condensed consolidated results of operations as if
all of the acquisitions closing prior to June 30, 2001 (as referred to above)
had occurred as of January 1, 2000, after giving effect to certain
adjustments, including depreciation and amortization and interest expense on
debt incurred to fund the acquisitions. These unaudited pro forma results have
been prepared for comparative purposes only and do not purport to be
indicative of what would have occurred had the acquisitions been made as of
January 1, 2000 or of results which may occur in the future.



                                                          Six Months  Six Months
                                                            Ended       Ended
                                                           June 30,    June 30,
                                                             2001        2000
                                                          ----------  ----------
                                                          In thousands, except
                                                             per share data:
                                                                
      Revenues........................................... $ 536,003   $ 298,346
      Net loss before extraordinary losses............... $(184,573)  $(114,863)
      Net loss........................................... $(184,573)  $(119,201)
      Basic and diluted loss per common share before
       extraordinary losses.............................. $   (0.98)  $   (0.72)
      Basic and diluted loss per common share............ $   (0.98)  $   (0.75)


  As of January 1, 2000 the Company had recorded a liability of approximately
$1.2 million related primarily to contractual obligations assumed in its
acquisition of towers from AT&T. During the six month period ended June 30,
2001 the Company recorded an additional liability of approximately $7.4
million related to contractual obligations assumed in connection with its
acquisition of Interpacket Networks, Inc. During the six months ended June 30,
2001 the Company recorded charges against these liabilities of approximately
$1.9 million. In addition, the Company reversed approximately $1.9 million
related to these liabilities against goodwill and other intangible assets. As
of June 30, 2000 the Company has a remaining liability of approximately $4.8
million all of which is related to contractual obligations assumed in the
Interpacket Networks, Inc. acquisition.

                                       6


  Since July 1, 2001 (excluding the ALLTEL transaction discussed above), the
Company has consummated several acquisitions for an aggregate preliminary
purchase price of $5.5 million. In addition, the Company is party to various
agreements, including the remaining portions of the ALLTEL transaction (not
disclosed above), relating to the acquisition of assets and businesses from
third parties for an estimated aggregate cost of approximately $329.1 million.
Such transactions are subject to the satisfaction of customary closing
conditions, which are expected to be met during the balance of 2001.

  The Company is also pursuing the acquisition of other properties and
businesses in new and existing locations, although we have not entered into
any definitive material agreements with respect to such acquisitions.

5. Business Segments

  The Company operates in three business segments; rental and management (RM),
network development services (Services), and satellite and fiber network
access services (SFNA). The RM segment provides for leasing and subleasing of
antennae sites on multi-tenant towers and the leasing of other properties for
a diverse range of customers primarily in the wireless communications and
broadcast industries. The Services segment offers a broad range of network
development services, including radio frequency engineering, network design,
site acquisition, construction, zoning and other regulatory approvals,
component part sales and antennae installation. The SFNA segment offers
satellite and fiber network services to telecommunications companies, internet
service providers, broadcasters and maritime customers, both domestic and
international.

  The accounting policies applied in compiling segment information below are
similar to those described in the Company's 2000 Annual Report on Form 10-K.
In evaluating financial performance, management focuses on operating profit
(loss), excluding depreciation and amortization, development and corporate
general and administrative expenses. This measure of operating profit (loss)
is also before interest income and other, net, interest expense, loss on
investment in US Wireless, note conversion expense, minority interest in net
earnings of subsidiaries, income taxes and extraordinary losses. For reporting
purposes, the RM segment includes interest income-TV Azteca, net.

  The Company's reportable segments are strategic business units that offer
different services. They are managed separately because each segment requires
different resources, skill sets and marketing strategies. All reported segment
revenues are generated from external customers.

  Summarized financial information concerning the Company's reportable
segments as of and for the three and six months ended June 30, 2001 and 2000
is shown in the following table (in thousands). The "Other" column below
represents amounts excluded from specific segments such as income taxes,
extraordinary losses, corporate general and administrative expense,
development expense, depreciation and amortization, loss on investment in US
Wireless, note conversion expense, minority interest in net earnings of
subsidiaries and interest. In addition, "Other" includes corporate assets such
as cash and cash equivalents, short-term investments, restricted cash and
investments, tangible and intangible assets and income tax accounts which have
not been allocated to specific segments.



Three Months Ended June
30,                          RM     Services   SFNA       Other       Total
- -----------------------  ---------- -------- --------  -----------  ----------
                                                     
2001
 Revenues............... $  106,493 $100,429 $ 56,046               $  262,968
 Operating profit (loss)
  ......................     58,528   12,346   (1,755) $  (173,059)   (103,940)
 Assets.................  4,533,458  774,161  656,386    1,038,393   7,002,398
2000
 Revenues............... $   63,233 $ 74,026 $ 29,788               $  167,047
 Operating profit
  (loss)................     35,098    8,899    6,546  $  (109,175)    (58,632)
 Assets.................  3,144,124  522,926  307,161    1,114,133   5,088,344



                                       7


                  AMERICAN TOWER CORPORATION AND SUBSIDIARIES

 NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS--Unaudited--(Continued)



Six Months Ended June 30,      RM     Services   SFNA      Other       Total
- -------------------------  ---------- -------- -------- -----------  ----------
                                                      
2001
 Revenues................. $  197,704 $206,943 $120,789              $  525,436
 Operating profit (loss)
  ........................    107,687   22,362    6,675 $  (312,171)   (175,447)
 Assets...................  4,533,458  774,161  656,386   1,038,393   7,002,398
2000
 Revenues................. $  116,940 $112,178 $ 53,446              $  282,564
 Operating profit (loss)..     62,621   14,851   11,188 $  (189,290)   (100,630)
 Assets...................  3,144,124  522,926  307,161   1,114,133   5,088,344


6. Financing Transactions

Equity offering--In January 2001, the Company completed a public offering of
10.0 million shares of its Class A common stock at $36.50 per share. The net
proceeds of the offering (after deduction of offering expenses) were
approximately $360.8 million. Proceeds from the offering have and will be used
to finance the construction of towers, fund pending and future acquisitions
and for general corporate purposes.

9 3/8% Senior Notes offering--In January 2001, the Company completed a private
notes placement of $1.0 billion 9 3/8% Senior Notes (Senior Notes), issued at
100% of their face amount. The Senior Notes mature on February 1, 2009. The
Senior Notes rank equally with the Company's convertible notes and rank junior
to all indebtedness of its subsidiaries including amounts outstanding under
the Company's credit facilities. Interest on the Senior Notes is payable
semiannually on February 1 and August 1, commencing on August 1, 2001. The
indenture governing the Senior Notes contains certain restrictive convenants
including restrictions on the Company's ability to incur more debt, guarantee
debt, pay dividends and make certain investments. Proceeds from the Senior
Notes placement have and will be used to finance construction of towers, fund
pending and future acquisitions and for general corporate purposes. The amount
outstanding under the Senior Notes was $1.0 billion as of June 30, 2001 and is
included in long-term obligations in the accompanying June 30, 2001 condensed
consolidated balance sheet.

Mexican credit facility--In February 2001, the Company's Mexican subsidiary
consummated a loan agreement that provides for borrowings of $95.0 million
(U.S. Dollars). If additional lenders are made party to the agreement, the
size of the facility may increase to $140.0 million. The Company has committed
to loan its Mexican subsidiary up to $45.0 million if additional lenders are
not made party to the agreement. The Company's committment will be reduced on
a dollar-for-dollar basis if additional lenders join the loan agreement. This
facility requires the maintenance of various covenants and ratios and is
guaranteed and collateralized by all of the assets of the Mexican subsidiary.
Interest rates on the loan are determined at the Mexican subsidiary's option
at either LIBOR plus margin or the Base Rate plus margin (each as defined in
the agreement). The loan will be due in 2003. The amount outstanding under the
Mexican credit facility was approximately $95.0 million as of June 30, 2001
and is included in long-term obligations in the accompanying June 30, 2001
condensed consolidated balance sheet.

7. Information Presented Pursuant to the Indenture for the Senior Notes

  The following table sets forth information that is presented solely to
address certain reporting requirements contained in the indenture for the
Senior Notes. This information presents certain financial data of the Company
on a consolidated basis and on a restricted group basis, as defined in the
indenture governing the Senior Notes. All of the Company's subsidiaries are
part of the restricted group, except its wholly owned subsidiary, Verestar and
its subsidiaries, whose operations constitute all of our satellite and fiber
network access services business segment.

                                       8


                  AMERICAN TOWER CORPORATION AND SUBSIDIARIES

 NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS--Unaudited--(Continued)




                                 Three Months Ended        Six Months Ended
                                    June 30, 2001            June 30, 2001
                               -----------------------  -----------------------
                                            Restricted               Restricted
                               Consolidated Group (1)   Consolidated Group (1)
                               ------------ ----------  ------------ ----------
Statement of Operations Data
(in thousands):
                                                         
Operating revenues............  $  262,968  $  206,922   $ 525,436   $ 404,647
                                ----------  ----------   ---------   ---------
Operating expenses:
Operating expenses excluding
 depreciation and
 amortization, development and
 corporate general and
 administrative expenses......     197,431     139,630     395,832     281,718
Depreciation and
 amortization.................     103,956      86,186     198,955     167,031
Development expense...........       2,557       2,146       5,302       4,602
Corporate general and
 administrative expense.......       6,407       6,407      11,534      11,534
                                ----------  ----------   ---------   ---------
  Total operating expenses....     310,351     234,369     611,623     464,885
                                ----------  ----------   ---------   ---------
Loss from operations..........     (47,383)    (27,447)    (86,187)    (60,238)
Interest expense..............     (70,061)    (67,390)   (136,740)   (131,471)
Interest income and other,
 net..........................       4,451       4,585      12,858      13,008
Interest income, TV Azteca,
 net of interest expense of
 $291 and $583 for the three
 and six months ended June 30,
 2001, respectively ..........       3,582       3,582       7,120       7,120
Loss on investment in US
 Wireless.....................     (22,226)    (22,226)    (22,226)    (22,226)
Minority interest in net
 earning of subsidiaries......          61          61           3           3
                                ----------  ----------   ---------   ---------
Loss before income taxes and
 extraordinary losses.........  $ (131,576) $ (108,835)  $(225,172)  $(193,804)
                                ==========  ==========   =========   =========

                                    June 30, 2001
                               -----------------------
                                            Restricted
                               Consolidated   Group
                               ------------ ----------
Balance Sheet Data (in
thousands):
                                                         
Cash and cash equivalents.....  $  440,842  $  423,713
Restricted cash and
 investments..................     119,757     119,757
Property and equipment, net...   2,912,155   2,616,516
Total assets..................   7,002,398   6,346,012
Long-term obligations,
 including current portion....   3,590,488   3,472,512
Net debt(2)...................   3,029,889   2,929,042
Total stockholders' equity....   3,062,243   3,062,243

- --------
(1) Corporate overhead allocable to Verestar and interest expense related to
    intercompany borrowings by Verestar (unrestricted subsidiary) have not
    been excluded from results shown for the restricted group.
(2) Net debt represents long-term obligations, including current portion, less
    cash and cash equivalents and restricted cash and investments.

                                       9


                  AMERICAN TOWER CORPORATION AND SUBSIDIARIES

 NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS--Unaudited--(Continued)


8. Comprehensive Loss

  Other comprehensive loss consists primarily of unrealized gains on available
for sale securities, derivative instruments accounted for as cash flow hedges
and the impact of the Company's adoption of SFAS No. 133 discussed in note 1.
The components of the Company's comprehensive loss are as follows (in
thousands):



                                       Three Months Ended    Six Months Ended
                                           June 30,              June 30,
                                       -------------------  --------------------
                                         2001       2000      2001       2000
                                       ---------  --------  ---------  ---------
                                                           
Net loss.............................  $(103,940) $(58,632) $(175,447) $(100,630)
Other comprehensive loss, net of tax:
  Unrealized gains on available for
   sale securities and other.........       (156)                (156)
  Derivative instruments accounted
   for as hedges.....................        266               (7,881)
                                       ---------  --------  ---------  ---------
Comprehensive loss before cumulative
 effect adjustment...................   (103,830)  (58,632)  (183,484)  (100,630)
Cumulative effect adjustment recorded
 upon the adoption of SFAS No. 133
 (net of an income tax benefit of
 $4,227).............................                          (7,852)
                                       ---------  --------  ---------  ---------
Comprehensive loss...................  $(103,830) $(58,632) $(191,336) $(100,630)
                                       =========  ========  =========  =========


9. Litigation

  The Company periodically becomes involved in various claims and lawsuits
that are incidental to its business. In the opinion of management, after
consultation with counsel, there are no matters currently pending which would,
in the event of adverse outcome, have a material impact on the Company's
consolidated financial position, the results of its operations or liquidity.

10. Loss on Investment in US Wireless

  During the quarter ended June 30, 2001, the Company recorded an impairment
charge of $22.2 million on its investment in US Wireless. The charge resulted
from an assessment that a loss in value in the Company's preferred stock
investment had occurred that was other than temporary.

11. Subsequent Event

  From the beginning of the third quarter of 2001 through August 14, 2001, the
Company acquired a portion of its outstanding convertible notes. During this
period, approximately $40.0 million in principal amount of the Company's
convertible notes was converted into shares of Class A common stock. In
addition, as of August 14, 2001, the conversion of another approximately $40.0
million in principal amount of the Company's convertible notes is pending,
subject to the signing of a definitive agreement. All of these conversions are
pursuant to exchange agreements which the Company negotiated with a limited
number of noteholders. Pursuant to these exchange agreements, the Company has
issued or will issue the number of shares of Class A common stock that these
noteholders are entitled to receive based on the conversion price set forth in
the applicable indenture, plus an additional number of shares of Class A
common stock that the Company has agreed to issue in order to induce them to
convert their holdings prior to the first scheduled redemption date. The
Company expects to record in the third quarter a non-cash charge equal to the
fair market value of these additional shares. The Company expects to negotiate
similar exchanges for its outstanding convertible notes during the third
quarter and from time to time in the future, subject to market conditions. To
the extent that inducement shares are issued by the Company as part of any
future exchanges, the Company expects to record additional non-cash charges.

                                      10


ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
        RESULTS OF OPERATIONS

  This Quarterly Report on Form 10-Q contains forward-looking statements
relating to our goals, beliefs, plans or current expectations and other
statements that are not of historical facts. For example, when we use words
such as "project," "believe," "anticipate," "expect," "estimate," "intend,"
"should," "would," "could" or "may," or other words that convey uncertainty of
future events or outcome, we are making forward-looking statements. We refer
you to the caption entitled "Factors that May Affect Future Results" below for
important factors that could cause actual results to differ materially from
those indicated by our forward-looking statements made herein. Forward-looking
statements represent management's current expectations and are inherently
uncertain. We do not undertake any obligation to update forward-looking
statements made by us.

  We are a leading wireless and broadcast communications infrastructure
company operating in three business segments.

  .   Rental and management. We operate the largest network of wireless
      communications towers in North America and are the largest independent
      operator of broadcast towers in North America, based on number of
      towers.

  .   Network development services. We provide comprehensive network
      development services and components for wireless service providers and
      broadcasters.

  .   Satellite and fiber network access services. Our Verestar subsidiary is
      a leading provider of integrated satellite and fiber network access
      services based upon the number of teleport antennae and facilities. We
      provide these services to telecommunications companies, Internet service
      providers, broadcasters and maritime customers, both domestic and
      international.

Results of Operations

  As of June 30, 2001, the Company owned and/or operated approximately 12,900
communications sites, as compared to approximately 9,500 communications sites
as of June 30, 2000. The acquisitions consummated in 2001 and 2000 have
significantly affected operations for the three and six months ended June 30,
2001, as compared to the three and six months ended June 30, 2000. See the
notes to the condensed consolidated financial statements and the Company's
Annual Report on Form 10-K for a description of the acquisitions consummated
in 2001 and 2000.

                                      11


Three Months Ended June 30, 2001 and 2000 (dollars in thousands)--Unaudited



                                      Three Months Ended
                                           June 30,        Amount of  Percentage
                                      -------------------   Increase   Increase
                                        2001       2000    (Decrease) (Decrease)
                                      ---------  --------  ---------- ----------
                                                          
Revenues:
Rental and management...............  $ 106,493  $ 63,233   $43,260        68%
Network development services........    100,429    74,026    26,403        36
Satellite and fiber network access
 services...........................     56,046    29,788    26,258        88
                                      ---------  --------   -------
Total revenues......................    262,968   167,047    95,921        57
                                      ---------  --------   -------
Operating Expenses:
Rental and management...............     51,547    31,290    20,257        65
Network development services........     88,083    65,127    22,956        35
Satellite and fiber network access
 services...........................     57,801    23,242    34,559       149
                                      ---------  --------   -------
Total operating expenses excluding
 depreciation and amortization,
 development and corporate general
 and administrative expenses........    197,431   119,659    77,772        65
                                      ---------  --------   -------
Depreciation and amortization.......    103,956    67,093    36,863        55
Development expense.................      2,557     4,196    (1,639)      (39)
Corporate general and administrative
 expense............................      6,407     3,084     3,323       108
Interest expense....................     70,061    38,437    31,624        82
Interest income and other, net......      4,451     3,851       600        16
Interest income, TV Azteca, net of
 $291 and $297 of interest expense,
 respectively ......................      3,582     3,155       427        14
Loss on investment in US Wireless...     22,226              22,226       N/A
Note conversion expense.............               16,968   (16,968)      N/A
Minority interest in net losses
 (earnings) of subsidiaries.........         61       (22)      (83)     (377)
Income tax benefit..................     27,636    16,774    10,862        65
                                      ---------  --------   -------
Net loss............................  $(103,940) $(58,632)  $45,308        77%
                                      =========  ========   =======


 Rental and Management Revenue

  Rental and management revenue for the three months ended June 30, 2001 was
$106.5 million, an increase of $43.3 million from the three months ended June
30, 2000. The increase resulted primarily from two factors: the acquisition
and construction of additional towers from July 1, 2000 to June 30, 2001 and
increased leasing activity on new and existing towers. From July 1, 2000 to
June 30, 2001, we continued to implement our growth strategy by aggressively
acquiring and building new towers. During that period we acquired more than
1,800 towers and constructed more than 1,700 towers. Additionally, during that
same period, we added more than 4,000 tenants to both newly
acquired/constructed and existing towers. This acquisition, construction and
leasing activity has not only significantly increased revenue, but has also
increased the scope, depth and strength of our national and international
tower network, providing us with a much larger base of tower revenue for the
three months ended June 30, 2001 as compared to the three months ended June
30, 2000.

  In the long term, we believe that our leasing revenues are likely to grow at
a more rapid rate than revenues from other segments of our business because of
increasing utilization of existing tower capacity, recent and pending
acquisitions and build-to-suit and other construction activities.

 Network Development Services Revenue

  Network development services revenue for the three months ended June 30,
2001 was $100.4 million, an increase of $26.4 million from the three months
ended June 30, 2000. The significant growth in revenues during the three
months ended June 30, 2001 as compared to the three months ended June 30, 2000
resulted primarily from a strategic acquisition and increased demand and
volume for our turn-key services.

                                      12


  During the fourth quarter of 2000, we acquired a tower lighting systems
company that helped expand our in-house service capabilities. This acquisition
provided significant additional revenues for the three months ended June 30,
2001. In addition, increased demand for other core turn-key services driven by
several large national contracts and increased carrier build outs provided a
significant increase in revenue for the three months ended June 30, 2001.
These increases were partially offset by a decrease in sales of component
parts driven by the loss in business from a key customer who has become
insolvent and the general economic slow-down in the telecommunications
industry.

 Satellite and Fiber Network Access Services Revenue

  Satellite and fiber network access services revenue for the three months
ended June 30, 2001 was $56.0 million, an increase of $26.3 million from the
three months ended June 30, 2000. The majority of the increase resulted from
the consummation of several key acquisitions that occurred in 2001 and 2000
including: General Telecom, U.S. Electrodynamics, Publicom, Interpacket
Networks and a Satellite Network Access Point (SNAP) facility from Swisscom.
These acquisitions significantly increased our service capabilities, revenue
base, and geographical scope of customers, leading to significant incremental
revenues in 2001. This increase in revenue was partially offset by the non-
renewal of several key customers and a decrease in demand for services in
Latin America.

 Rental and Management Expense

  Rental and management expense for the three months ended June 30, 2001 was
$51.5 million, an increase of $20.3 million from the three months ended June
30, 2000. The majority of the increase resulted from incremental operating
expenses incurred in the three months ended June 30, 2001 for the
approximately 3,500 towers that were acquired or constructed from July 1, 2000
to June 30, 2001 as discussed above. The remaining increase reflects increased
bad debt expense and higher operating expenses for the three months ended
June 30, 2001 related to towers that existed as of June 30, 2000.

 Network Development Services Expense

  Network development services expense for the three months ended June 30,
2001 was $88.1 million, an increase of $23.0 million from the three months
ended June 30, 2000. The significant increase in expense is primarily due to
the consummation of a strategic acquisition, overall increases in the volume
of services work performed, increases in the overhead costs necessary to
support both internal construction and external sales and increased bad debt
expense.

 Satellite and Fiber Network Access Services Expense

  Satellite and fiber network access services expense for the three months
ended June 30, 2001 was $57.8 million, an increase of $34.6 million from the
three months ended June 30, 2000. The primary reason for the increase was the
strategic acquisitions discussed above. Other components of the increase
include the building of infrastructure to help manage the growth of this
segment, increased overhead related to the development of new product lines
and increased bad debt expense.

 Depreciation and Amortization

  Depreciation and amortization for the three months ended June 30, 2001 was
$104.0 million, an increase of $36.9 million from the three months ended June
30, 2000. The principal component of the increase is an increase in
depreciation expense of $24.3 million. This is primarily a result of the
Company's purchase and acquisition of approximately $1.3 billion of property
and equipment from July 1, 2000 to June 30, 2001. The other component of the
increase is the increased amortization of $12.6 million, resulting from our
recording and amortizing approximately $557.7 million of goodwill and other
intangible assets related to acquisitions consummated from July 1, 2000 to
June 30, 2001.

                                      13


 Development Expense

 Development expense for the three months ended June 30, 2001 was $2.6
million, a decrease of $1.6 million from the three months ended June 30, 2000.
The decrease resulted primarily from reduced expenses incurred related to
acquisition integration and tower site inspections and related data gathering
in the three months ended June 30, 2001.

 Corporate General and Administrative Expense

  Corporate general and administrative expense for the three months ended June
30, 2001 was $6.4 million, an increase of $3.3 million from the three months
ended June 30, 2000. The majority of the increase is a result of higher
personnel and other administrative costs, as well as information technology
costs associated with supporting our increasing number of towers, expanding
revenue base and growth strategy.

 Interest Expense

  Interest expense for the three months ended June 30, 2001 was $70.1 million,
an increase of $31.6 million from the three months ended June 30, 2000. The
increase resulted primarily from interest expense on our credit facilities and
senior notes in aggregate of $28.9 million. The remaining component of the
increase represents increases in interest on other notes payable and capital
leases, as well as additional deferred financing amortization.

 Interest Income and Other, net

  Interest income and other, net for the three months ended June 30, 2001, was
$4.5 million, an increase of $0.6 million from the three months ended June 30,
2000. The increase is primarily related to an increase in interest earned on
invested cash on hand of approximately $7.3 million offset by losses on equity
investments and decreases in the fair value of derivative instruments not
accounted for as hedges.

 Interest Income, TV Azteca, net

  Interest income, TV Azteca, net for the three months ended June 30, 2001 was
$3.6 million, an increase of $0.4 million from the three months ended June 30,
2000. The increase results from interest earned on the entire principal amount
of the note, $119.0 million, for the three months ended June 30, 2001 as
compared to interest earned on a portion of the total principal amount of the
note for the three months ended June 30, 2000.

 Loss on Investment in US Wireless

  During the three months ended June 30, 2001, the Company recorded an
impairment charge of $22.2 million on its investment in US Wireless. The
charge resulted from an assessment that a loss in value on our preferred stock
investment had occurred that was other than temporary.

 Note Conversion Expense

  During the three months ended June 30, 2000, the Company acquired a portion
of its 6.25% and 2.25% convertible notes in exchange for shares of its Class A
common stock. As a consequence of those negotiated exchanges with certain of
its noteholders, the Company recorded note conversion expense of $17.0
million. The note conversion expense represents the fair value of incremental
stock issued as an inducement to noteholders to convert their holdings prior
to the first scheduled redemption date. There were no such exchanges during
the three months ended June 30, 2001. In August 2001, the Company entered into
additional negotiated exchanges and expects to negotiate similar transactions
from time to time.

 Income Tax Benefit

  The income tax benefit for the three months ended June 30, 2001 was $27.6
million, an increase of $10.9 million from the three months ended June 30,
2000. The primary reason for the increase is a result of the increase in our
loss before income taxes and extraordinary losses partially offset by an
increase in amortization of non-deductible goodwill arising from stock
acquisitions. The effective tax rate differs in both periods from the
statutory rate primarily due to the effect of non-deductible items,
principally the amortization of intangible assets, on certain stock
acquisitions for which we have recorded no tax benefit.

  In assessing the realizability of the deferred tax asset, we analyzed our
forecast of future taxable income and potential tax planning strategies and
concluded that recoverability of the net deferred tax asset is more likely
than not.

                                      14


Six Months Ended June 30, 2001 and 2000 (dollars in thousands)--Unaudited



                                      Six Months Ended
                                          June 30,         Amount of  Percentage
                                     --------------------   Increase   Increase
                                       2001       2000     (Decrease) (Decrease)
                                     ---------  ---------  ---------- ----------
                                                          
Revenues:
Rental and management..............  $ 197,704  $ 116,940   $80,764        69%
Network development services.......    206,943    112,178    94,765        85
Satellite and fiber network access
 services..........................    120,789     53,446    67,343       126
                                     ---------  ---------   -------
Total revenues.....................    525,436    282,564   242,872        86
                                     ---------  ---------   -------
Operating Expenses:
Rental and management..............     97,137     59,782    37,355        63
Network development services.......    184,581     97,327    87,254        90
Satellite and fiber network access
 services..........................    114,114     42,258    71,856       170
                                     ---------  ---------   -------
Total operating expenses excluding
 depreciation and amortization,
 development and corporate general
 and administrative expenses.......    395,832    199,367   196,465        99
                                     ---------  ---------   -------
Depreciation and amortization......    198,955    122,291    76,664        63
Development expense................      5,302      5,184       118         2
Corporate general and administra-
 tive expense......................     11,534      6,515     5,019        77
Interest expense...................    136,740     70,587    66,153        94
Interest income and other, net.....     12,858      6,437     6,421       100
Interest income, TV Azteca, net of
 $583 and $487 of interest expense,
 respectively .....................      7,120      5,463     1,657        30
Loss on investment in US Wireless..     22,226               22,226       N/A
Note conversion expense............                16,968   (16,968)      N/A
Minority interest in net losses
 (earnings) of subsidiaries........          3        (58)      (61)     (105)
Income tax benefit.................     49,725     30,214    19,511        65
Extraordinary losses on
 extinquishment of debt............                 4,338    (4,338)      N/A
                                     ---------  ---------   -------
Net loss...........................  $(175,447) $(100,630)  $74,817        75%
                                     =========  =========   =======


 Rental and Management Revenue

  Rental and management revenue for the six months ended June 30, 2001 was
$197.7 million, an increase of $80.8 million from the six months ended June
30, 2000. The increase resulted primarily from two factors: the acquisition
and construction of additional towers from July 1, 2000 to June 30, 2001 and
increased leasing activity on new and existing towers. From July 1, 2000 to
June 30, 2001, we continued to implement our growth strategy by aggressively
acquiring and building new towers. During that period we acquired more than
1,800 towers and constructed more than 1,700 towers. Additionally, during that
same period, we added more than 4,000 additional tenants to both newly
acquired/constructed and existing towers. This acquisition, construction and
leasing activity has not only significantly increased revenue, but has also
increased the scope, depth and strength of our national and international
tower network, providing us with a much larger base of tower revenue for the
six months ended June 30, 2001 as compared to the six months ended June 30,
2000.

  In the long term, we believe that our leasing revenues are likely to grow at
a more rapid rate than revenues from other segments of our business because of
increasing utilization of existing tower capacity, recent and pending
acquisitions and build-to-suit and other construction activities.

 Network Development Services Revenue

  Network development services revenue for the six months ended June 30, 2001
was $206.9 million, an increase of $94.8 million from the six months ended
June 30, 2000. The significant growth in revenues during the six months ended
June 30, 2001 as compared to the six months ended June 30, 2000 resulted
primarily from strategic acquisitions and increased demand and volume for our
turn-key services offset (to a lesser extent) by a decrease in sales in
component parts.

  During 2000, we acquired several companies that expanded our in-house
service capabilities to include: radio frequency engineering and design, steel
fabrication, broadcast tower erection and the manufacture and sale

                                      15


of tower lighting systems. These acquisitions have provided significant
increases in revenues for the six months ended June 30, 2001. In addition,
increased demand for turn-key services (driven by several large national
contracts and increased carrier build outs) also provided a significant
increase in revenue for the six months ended June 30, 2001.

 Satellite and Fiber Network Access Services Revenue

  Satellite and fiber network access services revenue for the six months ended
June 30, 2001 was $120.8 million, an increase of $67.3 million from the six
months ended June 30, 2000. The majority of the increase resulted from the
consummation of several key acquisitions that occurred in 2001 and 2000
including: General Telecom, U.S. Electrodynamics, Publicom, Interpacket
Networks and a SNAP facility from Swisscom. These acquisitions significantly
increased our service capabilities, revenue base and geographical scope of
customers, leading to significant incremental revenues in 2001. This increase
in revenue was partially offset by the non-renewal of several key customers
and a decrease in demand for services in Latin America.

 Rental and Management Expense

  Rental and management expense for the six months ended June 30, 2001 was
$97.1 million, an increase of $37.4 million from the six months ended June 30,
2000. The majority of the increase resulted from incremental operating
expenses incurred in the six months ended June 30, 2001 for approximately
3,500 towers that were acquired or constructed from July 1, 2000 to June 30,
2001 as discussed above. The remaining increase reflects increased bad debt
expense and higher operating expenses for the six months ended June 30, 2001
related to towers that existed as of June 30, 2000.

 Network Development Services Expense

  Network development services expense for the six months ended June 30, 2001
was $184.6 million, an increase of $87.3 million from the six months ended
June 30, 2000. The majority of the increase in expense is due to the
consummation of strategic acquisitions, overall increases in the volume of
services work performed, increases in the overhead costs necessary to support
both internal construction and external sales and increased bad debt expense.

 Satellite and Fiber Network Access Services Expense

  Satellite and fiber network access services expense for the six months ended
June 30, 2001 was $114.1 million, an increase of $71.9 million from the six
months ended June 30, 2000. The primary reason for the increase was the
strategic acquisitions discussed above. Other components of the increase
include the building of infrastructure to help manage the growth of this
segment, increased overhead related to new product lines and increased bad
debt expense.

 Depreciation and Amortization

  Depreciation and amortization for the six months ended June 30, 2001 was
$199.0 million, an increase of $76.7 million from the six months ended June
30, 2000. The principal component of the increase is an increase in
depreciation expense of $43.1 million. This is primarily a result of the
Company's purchase and acquisition of approximately $1.3 billion of property
and equipment from July 1, 2000 to June 30, 2001. The other component of the
increase is the increased amortization of $33.6 million, resulting from our
recording and amortizing approximately $557.7 million of goodwill and other
intangible assets related to acquisitions consummated from July 1, 2000 to
June 30, 2001.

                                      16


 Development Expense

  Development expense for the six months ended June 30, 2001 was $5.3 million,
an increase of $0.1 million from the six months ended June 30, 2000. The
increase resulted from abandoned acquisition costs, personnel costs and tower
site inspection and related data gathering costs incurred in the six months
ended June 30, 2001, partially offset by a decrease in acquisition integration
expenses for the same period.

 Corporate General and Administrative Expense

  Corporate general and administrative expense for the six months ended June
30, 2001 was $11.5 million, an increase of $5.0 million from the six months
ended June 30, 2000. The majority of the increase is a result of higher
personnel and other administrative costs, as well as information technology
costs associated with supporting our increasing number of towers, expanding
revenue base and growth strategy.

 Interest Expense

  Interest expense for the six months ended June 30, 2001 was $136.7 million,
an increase of $66.2 million from the six months ended June 30, 2000. The
increase resulted primarily from interest expense on our credit facilities and
senior notes in aggregate of $60.4 million. The remaining component of the
increase primarily represents interest on capital leases, as well as
additional deferred financing amortization.

 Interest Income and Other, net

  Interest income and other, net for the six months ended June 30, 2001, was
$12.9 million, an increase of $6.4 million from the six months ended June 30,
2000. The increase resulted primarily from interest earned on invested cash on
hand offset by losses on equity investments and decreases in the fair value of
derivative instruments not accounted for as hedges.

 Interest Income, TV Azteca, net

  Interest income, TV Azteca, net for the six months ended June 30, 2001 was
$7.1 million, an increase of $1.7 million from the six months ended June 30,
2001. The increase results from interest earned on the entire principal amount
of the note, $119.0 million, during the six months ended June 30, 2001 as
compared to less than the entire principal amount of the note for a portion of
the six months ended June 30, 2000.

 Loss on Investment in US Wireless

  During the six months ended June 30, 2001, the Company incurred an
impairment charge of $22.2 million on its investment in US Wireless. The
change resulted from an assessment that a loss in value on our preferred stock
investment had occurred that was other than temporary.

 Note Conversion Expense

  During the six months ended June 30, 2000, the Company acquired a portion of
its 6.25% and 2.25% convertible notes in exchange for shares of its Class A
common stock. As a consequence of those negotiated exchanges with certain of
its noteholders, the Company recorded note conversion expense of $17.0
million. The note conversion expense represents the fair value of incremental
stock issued as an inducement to noteholders to convert their holdings prior
to the first scheduled redemption date. There were no such exchanges during
the six months ended June 30, 2001. In August 2001, the Company entered into
additional negotiated exchanges and expects to negotiate similar transactions
from time to time.

 Income Tax Benefit

  The income tax benefit for the six months ended June 30, 2001 was $49.7
million, an increase of $19.5 million from the six months ended June 30, 2000.
The primary reason for the increase is a result of the increase in our loss
before income taxes and extraordinary losses partially offset by an increase
in amortization of non-deductible goodwill arising from stock acquisitions.
The effective tax rate differs in both periods from the statutory rate
primarily due to the effect of non-deductible items, principally the
amortization of intangible assets, on certain stock acquisitions for which we
have recorded no tax benefit.

                                      17


  In assessing the realizability of the deferred tax asset, we analyzed our
forecast of future taxable income and potential tax planning strategies and
concluded that recoverability of the net deferred tax asset is more likely
than not.

 Extraordinary Losses on Extinguishment of Debt, net

  The Company incurred extraordinary losses on the extinguishment of debt, net
in the first quarter 2000 of $4.3 million. The losses were incurred as a
result of an amendment and restatement of our primary credit facility ($3.0
million, net of a tax benefit of $2.0 million) and our early retirement of
debt assumed as part of the UNISite, Inc. merger ($1.3 million, net of a tax
benefit of $1.0 million).

Liquidity and Capital Resources

  Our liquidity needs arise from our acquisition-related activities, debt
service, working capital needs and capital expenditures associated principally
with our tower construction program. As of June 30, 2001, we had approximately
$440.8 million in cash and cash equivalents, working capital of approximately
$757.4 million and approximately $400.0 million of available borrowings under
our credit facilities.

  Historically, we have met our operational liquidity needs primarily with
internally generated funds and bank borrowings and have financed our
acquisitions and our construction program with a combination of capital funds
from sales of our equity and debt securities and bank borrowings. We expect
that this trend will continue in 2001.

  Our 2001 capital budget provides for expenditures of approximately $600.0
million, ($301.0 million of which has already been incurred as of June 30,
2001) which includes towers to be built under existing build-to-suit
agreements. In addition, based on the transactions executed to date, we expect
to close in 2001 on transactions pending as of June 30, 2001 of approximately
$465.1 million. Lastly, we believe that debt service requirements will be
significant for the remainder of 2001 and into the forseeable future. We
believe our current cash and cash equivalents and anticipated borrowing
capacity under our credit facilities will be sufficient to meet these cash
requirements. If we were to effect one or possibly two major new acquisitions
in the next twelve months, we would likely require additional funds from
external sources.

  For the six months ended June 30, 2001, cash flows used for operating
activities were $34.9 million, as compared to cash flows used for operating
activities of $42.7 million for the six months ended June 30, 2000. The change
is primarily related to increased cash generated from operations (exclusive of
changes in working capital).

  For the six months ended June 30, 2001, cash flows used for investing
activities were $952.9 million, as compared to $1.3 billion for the six months
ended June 30, 2000. The decrease in 2001 is primarily due to a decrease in
cash expended for mergers and acquisitions of approximately $499.3 million
offset by an increase in property and equipment expenditures.

  For the six months ended June 30, 2001, cash flows provided by financing
activities were $1.4 billion as compared to $1.8 billion for the six months
ended June 30, 2000. The decrease is primarily related to a reduction in net
cash inflows from bank borrowings and external debt and equity offerings in
aggregate.

  As of June 30, 2001, we had outstanding the indebtedness of $3.6 billion,
certain of which is described below under "Credit Facilities" and "Equity
Offering and Note Placement". As of June 30, 2001, we had outstanding $212.7
million principal amount of our 6.25% convertible notes due October 15, 2009,
$262.3 million principal amount of our 2.25% convertible notes due October 15,
2009, $450.0 million principal amount of our 5% convertible notes due February
1, 2010 and other debt of approximately $220.5 million. We may need to raise
cash from external sources to meet our debt service obligations and to pay the
principal amounts of our indebtedness when due.

  Credit Facilities. Our credit facilities provide us with a borrowing
capacity of up to $2.0 billion, with the option to increase the capacity up to
an additional $500.0 million, subject to lender approval. Borrowings under the
credit facilities are subject to certain borrowing base restrictions, such as
operating cash flow and tower construction cost levels. Our credit facilities
currently include a $650.0 million credit facility which was fully

                                      18


available (subject to the borrowing base restrictions) on June 30, 2001,
maturing on June 30, 2007, an $850.0 million multi-draw Term Loan A, which was
fully drawn on June 30, 2001, maturing on June 30, 2007, and a $500.0 million
Term Loan B, which was fully drawn on June 30, 2001 maturing on December 31,
2007. The credit facilities are scheduled to amortize quarterly commencing in
March 2003.

  We are currently in the process of negotiating the terms of an additional
$500.0 million of borrowings under our credit facilities as discussed in the
preceding paragraph, although no agreements have been executed. If an
agreement is reached, we expect the additional borrowing to occur during the
third quarter of 2001. We cannot, however, assure you we will negotiate and
close any additional borrowings.

  Our credit facilities contain certain financial and operational covenants
and other restrictions with which the borrower subsidiaries and restricted
subsidiaries must comply, whether or not there are any borrowings outstanding.
The parent company is also restricted with respect to indebtedness. We and the
restricted subsidiaries have guaranteed all of the loans. We have secured the
loans by liens on substantially all assets of the borrower subsidiaries and
the restricted subsidiaries and substantially all outstanding capital stock
and other debt and equity interests of all of our direct and indirect
subsidiaries.

  Under our credit facilities, we are also required to maintain an interest
reserve for our convertible notes and our senior notes. These funds can only
be used to make scheduled interest payments on our outstanding convertible
notes and senior notes. As of June 30, 2001 we had approximately $119.8
million of restricted cash and investments related to such interest reserve.

  In February 2001, our Mexican subsidiary, American Tower Corporation de
Mexico, S. de R.L. de C.V., which we refer to as ATC Mexico, and two of its
subsidiaries consummated a loan agreement with a group of banks providing a
credit facility of an initial aggregate amount of $95.0 million. If additional
lenders are made party to the agreement, the size of the facility may increase
to $140.0 million. We have committed to ATC Mexico to loan up to $45.0 million
if additional lenders are not made party to the agreement. Our commitment will
be reduced on a dollar-for-dollar basis if additional lenders join the
ATC Mexico loan agreement. This loan agreement requires maintenance of various
financial covenants and ratios and is guaranteed and collateralized by
substantially all of the assets of ATC Mexico and the assets of its
subsidiaries. All amounts borrowed under the loan agreement are due on
September 30, 2003. The lenders' commitment to make loans under the loan
agreement expires on March 31, 2002. As of June 30, 2001, an aggregate of
$95.0 million was outstanding under the loan agreement.

  Equity Offering and Note Placement. In January 2001, we completed a public
offering of 10.0 million shares of our Class A common stock for total net
proceeds of approximately $360.8 million. We also completed a private
placement of $1.0 billion of senior notes that mature in February 2009 for
total net proceeds of $969.0 million. These notes require semi-annual interest
payments and contain certain financial and operational covenants and other
restrictions similar to those in our credit facilities. We have used and will
use the proceeds from these two transactions to finance the construction of
towers, fund pending and future acquisitions and for general corporate
purposes.

  ATC Separation--We continue to be obligated under the ATC Separation
agreement for certain tax liabilities to CBS Corporation and American Radio
Systems. As of June 30, 2001 no matters covered under this indemnification
have been brought to our attention.

  Acquisitions and Construction. We expect that the consummated acquisitions
and current and future construction activities will have a material impact on
liquidity. We believe that the acquisitions, once integrated, will have a
favorable impact on liquidity and will offset the initial effects of the
funding requirements. We also believe that the construction activitites may
initially have an adverse effect on our future liquidity as newly constructed
towers will initially decrease overall liquidity. However, as such sites
become fully operational and

                                      19


achieve higher utilization, we expect that they will generate tower cash flow
and, in the long-term, increase liquidity. As of June 30, 2001, we were a
party to various agreements relating to the acquisition of assets or
businesses from various third parties and were involved in the construction of
numerous towers, pursuant to build-to-suit agreements and for other purposes
(see note 4 of the condensed consolidated financial statements).

  Economic Conditions. The slow down in the economy could reduce consumer
demand for wireless services, thereby causing providers to delay
implementation of new systems and technologies. We believe that the economic
slow down in 2001 has harmed, and may continue to harm, the financial
condition of some wireless service providers.

  Convertible Note Exchanges. From the beginning of the third quarter of 2001
through August 14, 2001, the Company acquired a portion of its outstanding
convertible notes. During this period, approximately $40.0 million in
principal amount of the Company's convertible notes was converted into shares
of Class A common stock. In addition, as of August 14, 2001, the conversion of
another approximately $40.0 million in principal amount of the Company's
convertible notes is pending, subject to the signing of a definitive
agreement. All of these conversions are pursuant to exchange agreements which
the Company negotiated with a limited number of noteholders. Pursuant to these
exchange agreements, the Company has issued or will issue the number of shares
of Class A common stock that these noteholders are entitled to receive based
on the conversion price set forth in the applicable indenture, plus an
additional number of shares of Class A common stock that the Company has
agreed to issue in order to induce them to convert their holdings prior to the
first scheduled redemption date. The Company expects to record in the third
quarter a non-cash charge equal to the fair market value of these additional
shares. The Company expects to negotiate similar exchanges for its outstanding
convertible notes during the third quarter and from time to time in the
future, subject to market conditions. To the extent that inducement shares are
issued by the Company as part of any future exchanges, the Company expects to
record additional non-cash charges.

  Recent Accounting Pronouncements--On January 1, 2001, the Company adopted
the provisions of SFAS No. 133 "Accounting for Derivative Instruments and
Hedging Activities". This statement establishes accounting and reporting
standards for derivative instruments. Specifically, it requires that an entity
recognize all derivatives as either assets or liabilities on the balance sheet
at fair value. The accounting for changes in the fair market value of a
derivative (that is unrealized gains or losses) is recorded as a component of
an entity's net income or other comprehensive income, depending upon
designation (as defined in the statement). Such adoption resulted in a charge
to other comprehensive income of $7.9 million, net of tax, from the cumulative
effect of adopting this standard.

  The Company is exposed to interest rate risk relating to variable interest
rates on its credit facilities. As part of its overall strategy to manage the
level of exposure to the risk of interest rate fluctuations, the Company uses
interest rate swaps, caps and collars, which qualify and are designated as
cash flow hedges. The Company also uses swaptions to manage interest rate
risk, which have not been designated as cash flow hedges.

  During the six months ended June 30, 2001, the Company recorded an
unrealized loss, excluding the charge for the cumulative effect of adopting
SFAS No. 133, of approximately $7.9 million (net of a tax benefit of
approximately $4.2 million) in other comprehensive loss for the change in fair
value of cash flows hedges and amounts reclassified into results of
operations. Hedge ineffectiveness resulted in a loss of approximately $1.0
million for the six months ended June 30, 2001 and was recorded in "interest
income and other, net". The Company records the changes in fair value of its
derivative instruments that are not accounted for as hedges in "interest
income and other, net". At June 30, 2001 the fair value of the Company's
derivative instruments represented a liability of approximately $25.8 million
and is included in "other long-term liabilities".

  In June 2001, SFAS No. 141, "Business Combinations" was approved by the
Financial Accounting Standards Board (FASB). SFAS No. 141 requires that the
purchase method of accounting be used for all business combinations initiated
after June 30, 2001. Goodwill and certain intangible assets will remain on the
balance sheet and not be amortized. On an annual basis, and when there is
reason to suspect that their values have been diminished or impaired, these
assets must be tested for impairment, and write-downs may be necessary. The
Company has not determined the impact, if any, that this statement will have
on its consolidated financial position or results of operations.

                                      20


  In June 2001, SFAS No. 142, "Goodwill and Other intangible Assets" was
approved by the FASB. SFAS No. 142 changes the accounting for goodwill from an
amortization method to an impairment-only approach. Amortization of goodwill,
including goodwill recorded in past business combinations, will cease upon
adoption of this statement. The Company is required to implement SFAS No. 142
on January 1, 2002 and it has not determined the impact that this statement
will have on its consolidated financial position or results of operations.

Factors That May Affect Future Results

  We operate in a rapidly changing environment that involves a number of
risks, some of which are beyond our control. The following discussion
highlights some of the risks that may affect future operating results.

Decrease in demand for tower space would materially and adversely affect our
operating results and we cannot control that demand

  Many of the factors affecting the demand for tower space, and to a lesser
extent our services business, affect our operating results. Those factors
include:

  .  consumer demand for wireless services;
  .  the financial condition of wireless service providers and their
     preference for owning rather than leasing antenna sites;
  .  the growth rate of wireless communications or of a particular wireless
     segment;
  .  the number of wireless service providers in a particular segment,
     nationally or locally;
  .  governmental licensing of broadcast rights;
  .  increased use of roaming and resale arrangements by wireless service
     providers. These arrangements enable a provider to serve customers
     outside its license area, to give licensed providers the right to enter
     into arrangements to serve overlapping license areas and to permit
     nonlicensed providers to enter the wireless marketplace. Wireless
     service providers might consider such roaming and resale arrangements as
     superior to constructing their own facilities or leasing antenna space
     from us;
  .  zoning, environmental and other government regulations;
  .  any new legislation, or interpretation of existing federal
     communications laws, that would give wireless service providers the
     right to place their antennae on public utility poles and other
     structures at regulated rates; and
  .  technological changes.

  The demand for antenna space is dependent, to a significantly lesser extent,
on the needs of television and radio broadcasters. Among other things,
technological advances, including the development of satellite-delivered
radio, may reduce the need for tower-based broadcast transmission. We could
also be affected adversely should the development of digital television be
delayed or impaired, or if demand for it were to be less than anticipated
because of delays, disappointing technical performance or cost to the
consumer.

  A significant general slow down in the economy could negatively affect the
foregoing factors influencing demand for tower space and tower related
services. For example, such a slow down could reduce consumer demand for
wireless services, thereby causing providers to delay implementation of new
systems and technologies. We believe that the economic slow down in 2001 has
already harmed, and may continue to harm, the financial condition of some
wireless service providers.

Our substantial leverage and debt service obligations may adversely affect our
cash flow and our ability to make payments on our senior notes

  As of June 30, 2001 we had outstanding $3.6 billion of consolidated debt.
Our substantial level of indebtedness increases the possibility that we may be
unable to generate cash sufficient to pay when due the principal of, interest
on or other amounts due in respect of our indebtedness. We may also obtain
additional long-term debt and working capital lines of credit to meet future
financing needs. This would have the effect of increasing our total leverage.

                                      21


  Our substantial leverage could have significant negative consequences,
including:

  .  increasing our vulnerability to general adverse economic and industry
     conditions;
  .  limiting our ability to obtain additional financing;
  .  requiring the dedication of a substantial portion of our cash flow from
     operations to service our indebtedness, thereby reducing the amount of
     our cash flow available for other purposes, including capital
     expenditures;
  .  requiring us to sell debt or equity securities or to sell some of our
     core assets, possibly on unfavorable terms, to meet payment obligations;
  .  limiting our flexibility in planning for, or reacting to, changes in our
     business and the industries in which we compete; and
  .  placing us at a possible competitive disadvantage with less leveraged
     competitors and competitors that may have better access to capital
     resources.

  A significant portion of our outstanding indebtedness bears interest at
floating rates. As a result, our interest payment obligations on such
indebtedness will increase if interest rates increase.

Restrictive covenants in our domestic credit facilities and our senior notes
could adversely affect our business by limiting flexibility

  The indenture for our senior notes and our domestic credit facilities
contain restrictive covenants that limit our ability to take various actions
and engage in various types of transactions. These restrictions include:

  .  paying dividends and making distributions or other restricted payments;
  .  incurring more debt, guaranteeing indebtedness and issuing preferred
     stock;
  .  issuing stock of some types of subsidiaries;
  .  making specified types of investments;
  .  creating liens;
  .  entering into transactions with affiliates;
  .  entering into sale-leaseback transactions; and
  .  merging, consolidating or selling assets.

  These covenants could have an adverse effect on our business by limiting our
ability to take advantage of financing, merger and acquisition or other
corporate opportunities.

Build-to-suit construction projects and major acquisitions from wireless
service providers increase our dependence on a limited number of customers,
the loss of which could materially decrease revenues, and may also involve
less favorable terms

  Our focus on major build-to-suit projects for wireless service providers and
related acquisitions entail several unique risks. First is our greater
dependence on a limited number of customers and the risk that customer losses
could materially decrease revenues. Another risk is that our agreements with
these wireless service providers have lease and control terms that are more
favorable to them than the terms we give our tenants generally. In addition,
although we have the benefit of an anchor tenant in build-to-suit projects, we
may not be able to find a sufficient number of additional tenants. In fact,
one reason wireless service providers may prefer build-to-suit arrangements is
to share or escape the costs of an undesirable site. A site may be undesirable
because it has high construction costs or may be considered a poor location by
other providers.

Our construction program increases our exposure to risks that could increase
costs and adversely affect our earnings and growth

  Our construction activities involve substantial risks. These risks include:

  .  increasing our debt and the amount of payments required on it;

                                      22


  .  increasing competition for construction sites and experienced tower
     construction companies, resulting in significantly higher costs and
     failure to meet time schedules;
  .  failing to meet time schedules, which could result in our paying
     significant penalties to prospective tenants, particularly in build-to-
     suit situations; and
  .  possible lack of sufficient experienced personnel to manage an expanded
     construction program.

If we are unable to construct or acquire new towers at the pace, in the
locations and at the costs we desire, our business would be adversely affected

  Our growth strategy depends in part on our ability to construct and acquire
towers in locations and on a time schedule that meets the requirements of our
customers. If our tower construction and acquisition projects fail to meet the
requirements of our customers, or fail to meet their requirements at our
projected costs, our business would be adversely affected. If we are unable to
build new towers where and when our customers require them, or where and when
we believe the best opportunity to add tenants exists, we could fail to meet
our contractual obligations under build-to-suit agreements, thereby incurring
substantial penalties and possibly contract terminations. In addition, we
could lose opportunities to lease space on our towers. Our ability to
construct a tower at a location, on a schedule, and at a cost we project can
be affected by a number of factors beyond our control, including:

  . zoning, and local permitting requirements and national regulatory
  approvals;
  . environmental opposition;
  . availability of skilled construction personnel and construction
  equipment;
  . adverse weather conditions; and
  . increased competition for tower sites, construction materials and labor.

Increasing competition in the satellite and fiber network access services
market may slow Verestar's growth and adversely affect its business

  In the satellite and fiber network access services market, Verestar competes
with other satellite communications companies that provide similar services,
as well as other communications service providers. Some of Verestar's existing
and potential competitors consist of companies from whom Verestar currently
leases satellite and fiber network access in connection with the provision of
Verestar's services to its customers. Increased competition could result in
Verestar being forced to reduce the fees it charges for its services and may
limit Verestar's ability to obtain, on economical terms, services that are
critical to its business. We anticipate that Verestar's competitors may
develop or acquire services that provide functionality that is similar to that
provided by Verestar's services and that those competitive services may be
offered at significantly lower prices or bundled with other services. Many of
the existing and potential competitors have financial and other resources
significantly greater than those available to Verestar.

If we cannot keep raising capital, our growth will be impeded

  Without additional capital, we would need to curtail our acquisition and
construction programs that are essential for our long-term success. We expect
to use borrowed funds to satisfy a substantial portion of our capital needs.
However, we must continue to satisfy financial ratios and to comply with
financial and other covenants in order to do so. If our revenues and cash flow
do not meet expectations, we may lose our ability to borrow money or to do so
on terms we consider to be favorable. Conditions in the capital markets also
will affect our ability to borrow, as well as the terms of those borrowings.
All of these factors could also make it difficult or impossible for us
otherwise to raise capital, particularly on terms we would consider favorable.

If we cannot successfully integrate acquired sites or businesses or manage our
operations as we grow, our business will be adversely affected and our growth
may slow or stop

  A significant part of our growth strategy is the continued pursuit of
strategic acquisitions of independent tower operators and consolidators,
wireless service providers and service and teleport businesses. We cannot

                                      23


assure you, however, that we will be able to integrate successfully acquired
businesses and assets into our existing business. Our growth has placed, and
will continue to place, a significant strain on our management and our
operating and financial systems. Successful integration of these and any
future acquisitions will depend primarily on our ability to manage these
assets and combined operations and, with respect to the services and satellite
and fiber network access services businesses, to integrate new management and
employees into our existing operations.

If our chief executive officer left, we would be adversely affected because we
rely on his reputation and expertise, and because of our relatively small
senior management team

  The loss of our chief executive officer, Steven B. Dodge, has a greater
likelihood of having a material adverse effect upon us than it would on most
other companies of our size because of our comparatively smaller executive
group and our reliance on Mr. Dodge's expertise. Our growth strategy is highly
dependent on the efforts of Mr. Dodge. Our ability to raise capital also
depends significantly on the reputation of Mr. Dodge. You should be aware that
we have not entered into an employment agreement with Mr. Dodge. The tower
industry is relatively new and does not have a large group of seasoned
executives from which we could recruit a replacement for Mr. Dodge.

Expanding operations into foreign countries could create expropriation,
governmental regulation, funds inaccessibility, foreign exchange exposure and
management problems

  Our expansion into Mexico and Brazil, and other possible foreign operations
in the future, could result in adverse financial consequences and operational
problems not experienced in the United States. We have made a substantial loan
to a Mexican company and have acquired and are constructing a sizable number
of towers in that country. We also acquired the rights to 156 communications
towers in Brazil and entered into a build-to-suit agreement for an additional
400 towers in that country. As a result of acquisitions by Verestar, we have
network operation centers in Europe, Asia, South America and Africa. We may
also engage in comparable transactions in other countries in the future. Among
the risks of foreign operations are governmental expropriation and regulation,
inability to repatriate earnings or other funds, currency fluctuations,
difficulty in recruiting trained personnel, and language and cultural
differences, all of which could adversely affect these operations.

New technologies could make our tower antenna leasing services less desirable
to potential tenants and result in decreasing revenues

  The development and implementation of signal combining technologies, which
permit one antenna to service two different transmission frequencies and,
thereby, two customers, may reduce the need for tower-based broadcast
transmission and hence demand for our antenna space.

  Mobile satellite systems and other new technologies could compete with land-
based wireless communications systems, thereby reducing the demand for tower
lease space and other services we provide. The Federal Communications
Commission has granted license applications for several low-earth orbiting
satellite systems that are intended to provide mobile voice or data services.
In addition, the emergence of new technologies could reduce the need for
tower-based transmission and reception and have an adverse effect on our
operations. The growth in delivery of video services by direct broadcast
satellites could also adversely affect demand for our antenna space.

We could have liability under environmental laws

  As the owner, lessee and operator of real property and facilities, we are
subject to federal, state and local and foreign environmental laws relating to
the management, use, storage, disposal, emission and remediation of, and
exposure to, hazardous and non-hazardous substances, materials and waste. We
are also subject to related registration, permitting, record keeping and
financial assurance requirements. See "Legal Proceedings" for a

                                      24


description of a civil complaint filed against us by the District Attorney for
the County of Santa Clara, California regarding certain alleged recordkeeping,
registration, hazardous materials management and filing violations under
California environmental laws. Various environmental laws require us to
investigate, remove or remediate soil and groundwater contaminated by
hazardous substances or wastes on property we own or lease or which is
associated with tower operations, and may subject us to penalties and fines
for violations of those environmental laws. Some of those laws impose cleanup
responsibility and liability without regard to whether the owner, lessee or
operator of the property or facility knew of or was responsible for the
contamination, or whether operations at the property have been discontinued or
the property has been transferred. The owner, lessee or operator of
contaminated property also may be subject to common law claims by third
parties based on damages and costs resulting from off-site migration of the
contamination. In connection with our former and current ownership, lease or
operation of our properties, we may be liable for those types of environmental
costs. Fines or penalties resulting from any failure to comply with those
environmental laws and addressing claims or obligations arising under them
could have a material adverse effect on our financial condition, results of
operations and liquidity.

Our business is subject to government regulations and changes in current or
future laws or regulations could harm our business

  We are subject to federal, state and local and foreign regulation of our
business. Both the FCC and the FAA regulate towers used for wireless
communications and radio and television antennae. In addition, the FCC
separately licenses and regulates wireless communication devices and
television and radio stations operating from towers. Similar regulations exist
in Mexico and other foreign jurisdictions regarding wireless communications
and the operation of communications towers. Failure to comply with applicable
requirements may lead to monetary penalties and other sanctions, including
being disqualified from holding licenses for our Verestar business or
registrations for our towers and may require us to indemnify our customers
against any such failure to comply. New regulations may impose additional
costly burdens on us, which may affect our revenues and cause delays in our
growth.

  In January 2001, the FCC concluded investigations of several operators of
communications towers, including us. The FCC sent us a Notice of Apparent
Liability for Forfeiture ("NAL") preliminarily determining that we had failed
to file specified informational forms, had failed to properly post specified
information at various tower sites and on one occasion had failed to properly
light a tower. The FCC also ordered an additional review of our overall
procedures for and degree of compliance with the FCC's regulations. We have
reached a settlement with the FCC regarding the compliance issues arising out
of the Notice of Apparent Liability in the form of a Consent Decree. As part
of the Consent Decree, the FCC has rescinded the NAL and terminated the
further investigation ordered in the NAL. We have agreed to make a voluntary
contribution of $0.3 million to the U.S. Treasury and to maintain an active
compliance plan. Such payment will be made in September 2001.

  The construction and reconstruction of a substantial number of antennae
needed to deliver digital television service to our customers may require
state and local regulatory approvals. The FCC has indicated that it may adopt
preemptive guidelines. If adopted, these regulations may be more or less
restrictive than existing state and local regulations and may increase our
construction costs.

Our costs could increase and our revenues could decrease due to perceived
health risks from radio emissions, especially if these perceived risks are
substantiated

  Public perception of possible health risks associated with cellular and
other wireless communications media could slow the growth of wireless
companies, which could in turn slow our growth. In particular, negative public
perception of, and regulations regarding, these perceived health risks could
slow the market acceptance of wireless communications services.

  If a connection between radio emissions and possible negative health
effects, including cancer, were established, our operations, costs and
revenues would be materially and adversely affected. We do not maintain any
significant insurance with respect to these matters.


                                      25


Control by our principal stockholders could deter mergers where you could get
more than current market price for your stock

  Steven B. Dodge, together with his affiliates, owned approximately 26% of
our total voting power as of February 28, 2001. Control by Mr. Dodge and
others may discourage a merger or other takeover of our company in which
holders of common stock might be paid a premium for their shares over then-
current market prices. Mr. Dodge, together with a limited number of our
directors, may be able to control or block the vote on mergers and other
matters submitted to the common stockholders.

Information Presented Pursuant to the Indenture for the Senior Notes

  The following table sets forth information that is presented solely to
address certain reporting requirements contained in the indenture for our
senior notes. This information presents certain financial data for us on a
consolidated basis and on a restricted group basis, which means only for
American Tower and its subsidiaries that comprise the restricted group under
the indenture. All of our subsidiaries are part of this restricted group,
except Verestar and its subsidiaries, whose operations constitute all of our
satellite and fiber network access services business segment. This restricted
group data is not intended to represent an alternative measure of operating
results, financial position or cash flow from operations, as determined in
accordance with generally accepted accounting principles.



                               Three months ended          Six months ended
                                  June 30, 2001              June 30, 2001
                            --------------------------  -----------------------
                                           Restricted                Restricted
                            Consolidated   Group (1)    Consolidated  Group(1)
                            ------------  ------------  ------------ ----------
                                                         
Statement of Operations
 Data (in thousands):
Operating revenues........  $   262,968   $    206,922   $ 525,436   $ 404,647
                            -----------   ------------   ---------   ---------
Operating expenses:
Operating expenses........      197,431        139,630     395,832     281,718
Depreciation and
 amortization.............      103,956         86,186     198,955     167,031
Development expense.......        2,557          2,146       5,302       4,602
Corporate general and
 administrative expense...        6,407          6,407      11,534      11,534
                            -----------   ------------   ---------   ---------
  Total operating
   expense................      310,351        234,369     611,623     464,885
                            -----------   ------------   ---------   ---------
Loss from operations......      (47,383)       (27,447)    (86,187)    (60,238)
Interest expense..........      (70,061)       (67,390)   (136,740)   (131,471)
Interest income and other,
 net......................        4,451          4,585      12,858      13,008
Interest income, TV
 Azteca...................        3,582          3,582       7,120       7,120
Loss on investment in US
 Wireless.................      (22,226)       (22,226)    (22,226)    (22,226)
Minority interest in net
 earnings of
 subsidiaries.............           61             61           3           3
                            -----------   ------------   ---------   ---------
Loss before income taxes
 and extraordinary
 losses...................  $  (131,576)  $   (108,835)  $(225,172)  $(193,804)
                            ===========   ============   =========   =========




                                                        June 30, 2001
                                                ------------------------------
                                                Consolidated  Restricted Group
                                                ------------- ----------------
                                                        
Balance Sheet Data (in thousands):
Cash and cash equivalents...................... $     440,842  $     423,713
Restricted cash and investments................       119,757        119,757
Property and equipment, net....................     2,912,155      2,616,516
Total assets...................................     7,002,398      6,346,012
Long-term obligations, including current
 portion.......................................     3,590,488      3,472,512
Net debt(2)....................................     3,029,889      2,929,042
Total stockholders' equity.....................     3,062,243      3,062,243

- --------
(1) Corporate overhead allocable to Verestar and interest expense related to
   intercompany borrowings by Verestar (unrestricted subsidiary) have not been
   excluded from results shown for the restricted group.
(2) Net debt represents long-term obligations, including current portion, less
   cash and cash equivalents and restricted cash and investments.

                                      26


  Tower Cash Flow, Adjusted Consolidated Cash Flow and Non-Tower Cash Flow for
the Company and its restricted subsidiaries, as defined in the indenture for
our senior notes, are as follows:


                                                                 
  Tower Cash Flow, for the three months ended June 30, 2001........ $    58,528
                                                                    ===========
  Consolidated Cash Flow, for the twelve months ended June 30,
   2001............................................................ $   240,648
    Less: Tower Cash Flow, for the twelve months ended June 30,
     2001..........................................................    (196,658)
    Plus: four times Tower Cash Flow, for the three months ended
     June 30, 2001.................................................     234,112
                                                                    -----------
  Adjusted Consolidated Cash Flow, for the twelve months ended June
   30, 2001........................................................ $   278,102
                                                                    ===========
  Non-Tower Cash Flow, for the twelve months ended June 30, 2001... $    30,090
                                                                    ===========


                                       27


ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

  We are exposed to market risk from changes in interest rates on our long-
term debt obligations. We attempt to reduce these risks by utilizing
derivative financial instruments, namely interest rate caps, swaps, collars
and swaptions pursuant to our policies. All derivative financial instruments
are for purposes other than trading. For the six months ended June 30, 2001,
we increased our borrowings under our credit facilities by approximately $95.0
million. In addition, we completed a private placement of $1.0 billion of our
senior notes issued at 100% of their face amount. The proceeds from the above
have and will be used to finance construction and acquisitions. In the short-
term, we invested any unused proceeds in marketable debt securities,
commercial paper and cash and cash equivalents. Lastly, in June 2001 we
entered into an interest rate collar agreement with a total notional amount of
$47.5 million expiring in June 2003.

  The following table provides information as of June 30, 2001 about our
market risk exposure associated with changing interest rates. For long-term
debt obligations, the table presents principal cash flows and related average
interest rates by contractual maturity dates. For interest rate caps, swaps,
collars and swaptions, the table presents notional principal amounts and
weighted-average interest rates by contractual maturity dates.

                      Twelve Month Period Ended June 30,
 Principal Payments and Interest Rate Detail by Contractual Maturity Dates (in
                                  thousands)



Long-Term Debt               2002          2003         2004     2005     2006   Thereafter    Total    Fair Value
- --------------            ----------    ----------    -------- -------- -------- ----------  ---------- ----------
                                                                                
Fixed Rate Debt(a)......  $             $             $        $        $        $1,925,011  $1,925,011 $1,789,329
Average Interest
 Rate(a)................                                                               7.55%

Variable Rate Debt (a)..  $             $   28,000    $219,000 $217,500 $249,375 $  731,125  $1,445,000 $1,445,000

 Aggregate Notional Amounts Associated with Interest Rate Caps, Swaps, Collars
                and Swaptions in Place during the Twelve Month
 Period Ended June 30, and Interest Rate Detail by Contractual Maturity Dates
                                (in thousands)


Interest Rate CAPS
- ------------------
                                                                                
Notional Amount.........  $  364,980(c)
Cap Rate................        9.00%

Interest Rate SWAPS
- -------------------
                                                                                
Notional Amount.........  $  395,000(d) $  365,000(e)                                                   $  (15,428)
Weighted-
 Average Fixed Rate
 Payable(b).............        6.69%         6.67%

Interest Rate COLLARS
- ---------------------
                                                                                
Notional Amount.........  $  512,500(f) $  327,500(g)                                                   $  (12,773)
Weighted-
 Average Below Floor
 Rate Payable, Above Cap
 Rate Receivable(b).....  6.14%-8.54%   5.75%-8.01%

Interest Rate SWAPTIONS
- -----------------------
                                                                                
Notional Amount.........  $  290,000(h)                                                                 $    2,365
Weighted-Average Rate(b)        6.56%

- -------
(a)  June 30, 2001 variable rate debt consists of our domestic and Mexican
     credit facilities ($1.45 billion) and fixed rate debt consists of the
     2.25% and 6.25% convertible notes ($475.0 million), the 5.0% convertible
     notes ($450.0 million) and the senior notes ($1.0 billion). Interest on
     the credit facilities is payable in accordance with the applicable London
     Interbank Offering Rate (LIBOR) agreement or quarterly and accrues at our
     option either at LIBOR plus margin (as defined) or the Base Rate plus
     margin (as defined). The average interest rate in effect at June 30, 2001
     for the credit facilities was 7.24%. For the six months ended June 30,
     2001, the weighted average interest rate under the credit facilities was
     8.58%. The 2.25% and 6.25% convertible notes each bear interest (after
     giving effect to the accretion of the original discount on the 2.25%
     convertible notes) at 6.25%, which is payable semiannually on April 15
     and October 15 of each year. The 5.0% convertible notes bear interest at
     5.0% which is payable semiannually on February 15 and August 15 of each
     year. The senior notes bear interest at 9 3/8% which is payable
     semiannually on February 1 and August 1 of each year beginning August 1,
     2001.
(b)  Represents the weighted-average fixed range of interest based on contract
     notional amount as a percentage of total notional amounts in a given
     year.
(c)  Includes notional amounts of $364,980 that will expire in February 2002.
(d)  Includes notional amounts of $30,000 that will expire in March 2002.
(e)  Includes notional amounts of $75,000 and $290,000 that will expire in
     January and February 2003, respectively.
(f)  Includes notional amount of $185,000 that will expire in May 2002.
(g)  Includes notional amounts of $95,000, $185,000 and $47,500 that will
     expire in July 2002 and May and June 2003, respectively.
(h)  Includes notional amounts of $290,000 that will expire in August 2001.

                                      28


  As discussed above, we maintain a portion of our cash and cash equivalents
and short-term investments in financial instruments that are subject to
interest rate risks. Due to the relatively short duration of such instruments,
fluctuations in interest rates should not materially affect our financial
condition or results of operations.

  The effect of foreign currency fluctuations on our foreign operations, which
include Mexico and Brazil, have not been significant to date. This has been
the case in Mexico primarily because most contracts are denominated in U.S.
dollars, and in Brazil because we are in the early stages of developing our
network. Accordingly, foreign currency risk has not been material for the six
months ended June 30, 2001.


                                      29


                          PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

  As previously disclosed by the Company in its Quarterly Report on Form 10-Q
for the quarter ended March 31, 2001, on April 23, 2001 the District Attorney
for the County of Santa Clara, California filed a civil complaint against the
Company in the Superior Court of California. The complaint alleges record
keeping, registration, hazardous materials management and filing violations
under California environmental laws. The complaint does not allege any
contamination of the environment occurred as a result of the alleged
violations. The Company has taken measures to ensure that these sites are in
compliance with appliance California environmental laws and believes that they
are currently in compliance with such laws. On May 23, 2001, the Company filed
an answer to the complaint formally denying the allegations. The Company
believes that the resolution of the violations alleged in the complaint will
not have a material adverse effect on its financial condition or results of
operations.

ITEM 2. CHANGES IN SECURITIES AND USE OF PROCEEDS

  On March 1, 2001, the Company consummated its acquisition of Vancomm, Inc.
pursuant to which it issued to the former stockholders of Vancomm 43,890
shares of Class A Common Stock as consideration for the acquisition.

  On March 12, 2001, the Company issued 100,000 shares of Class A common stock
to J.P. Morgan Partners (23A SBIC), LLC in exchange for 78,432 shares of Class
B common stock, $0.01 par value per share, of America Connect, Inc.

  On June 29, 2001, the Company consummated its acquisition of Site Advantage,
Inc. pursuant to which it issued 298,170 shares of Class A Common Stock to the
former stockholders of Site Advantage, Inc. as consideration, in part, for the
acquisition.

  The Company issued all the shares referred to in the foregoing paragraphs in
reliance on the exemption from registration provided by Section 4(2) of the
Securities Act of 1933. As a basis for doing so, the Company relied on the
following facts: (1) the Company offered the securities to a limited number of
offerees without any general solicitation, (2) the Company obtained
representations from the purchasers regarding their financial suitability and
investment intent and (3) the Company issued all of the securities with
restrictive legends on the certificates to limit resales.

ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

  The 2001 Annual Meeting of Stockholders was held on Thursday, May 17, 2001,
to consider and act upon the following matters, all of which were approved and
adopted. The results of the stockholder voting were as follows:

1. To elect eight (8) Directors including two "Class A" directors to be
   elected by the holders of Class A common stock, voting separately as a
   class, for the ensuing year or until their successors are elected and
   qualified.



                                                           Votes Cast    Votes
                                                               For     Withheld
                                                           ----------- ---------
                                                                 
   Steven B. Dodge........................................ 221,851,565 7,657,484
   Thomas H. Stoner....................................... 228,390,272 1,118,777
   Arnold L. Chavkin...................................... 228,232,411 1,276,638
   Alan L. Box............................................ 221,853,815 7,655,234
   J. Michael Gearon, Jr.................................. 220,918,915 7,590,134
   David W. Garrison...................................... 222,002,514 7,506,535
   Fred R. Lummis*........................................ 152,322,070 1,274,779
   Maggie Wilderotter*.................................... 152,478,190 1,118,658

- --------
 * In accordance with the Company's Restated Certificate of Incorporation, the
   holders of Class A common stock, exclusive of all other stockholders, are
   entitled to elect two of the Company's directors. Mr. Lummis and Ms.
   Wilderotter were nominated as the Class A directors and elected by the
   holders of the Class A common stock.


                                      30


2. To approve an evergreen amendment to the Company's 1997 Stock Option Plan,
   as amended and restated, to provide for automatic annual increases in the
   number of shares of the Company's Class A common stock available for
   issuance thereunder.



                                                                                 Broker
   Votes Cast For         Votes Against             Votes Withheld             Non- Votes
   --------------         -------------             --------------             ----------
                                                                      
   148,322,087             53,512,184                  219,344                 27,455,434


3. To ratify the selection by the Board of Directors of Deloitte & Touche LLP
   as the Company's independent auditors for 2001.



                                                                          Broker Non-
   Votes Cast For        Votes Against           Votes Withheld              Votes
   --------------        -------------           --------------           -----------
                                                                 
   226,025,491             3,378,326                105,232                     0


ITEM 5. OTHER INFORMATION

  The following information updates the status of the ALLTEL transaction as
previously disclosed by us in Current Reports on Form 8-K filed on December
20, 2000, April 17, 2001, June 11, 2001 and July 9, 2001 and in a Quarterly
Report on Form 10-Q filed by us on May 15, 2001.

  On August 1, 2001, we closed on the sublease of 181 towers pursuant to our
agreement with ALLTEL. These towers were used by ALLTEL primarily in
connection with its business of providing consumer wireless services. We plan
to lease space on the towers to third parties. In connection with this
closing, we paid consideration of approximately $54.3 million in cash. The
amount of consideration and the terms of the agreement were based upon arms-
length negotiations between unaffiliated parties. There are no material
relationships between us and ALLTEL or any of its respective affiliates,
officers or directors. We financed the transaction through available cash-on-
hand, including proceeds from our January 2001 equity and debt financings. For
more information about our agreement with ALLTEL, see our Current Reports on
Form 8-K filed on December 20, 2000, April 17, 2001, June 11, 2001 and July 9,
2001; our Quarterly Report on Form 10-Q filed May 15, 2001; note 4 to the
condensed consolidated financial statements set forth herein; and the exhibits
incorporated by reference into this Quarterly Report on Form 10-Q.

                                      31


ITEM 6. EXHIBITS AND REPORTS ON FORM 8-K

  (a) Exhibits.

  Listed below are the exhibits which are filed as part of this Form 10-Q
(according to the number assigned to them in Item 601 of Regulation S-K).



 Exhibit No. Description of Exhibit
 ----------- ----------------------
          
    10.1*    Amended and Restated American Tower Systems Corporation 1997 Stock Option Plan,
             as amended May 17, 2001.
    10.2     Amended and Restated Registration Rights Agreement, dated as of February 25,
             1999, by and among ATC and each of the Parties named therein.

- --------
* Compensatory Plan

  (b) Reports on Form 8-K.

  During the quarter ended June 30, 2001, the Registrant filed with the
Commission the following Current Reports on Form 8-K:

  1.Form 8-K (Item 2) filed on April 17, 2001.
  2.Form 8-K (Item 2) filed on June 11, 2001.
  3.Form 8-K (Items 5 and 7) filed on June 22, 2001.

                                      32


                                  SIGNATURES

  Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized.

                                          American Tower Corporation

                                          By: /s/ Joseph L. Winn
Date: August 14, 2001                        ----------------------------------
                                                       Joseph L. Winn
                                                Chief Financial Officer and
                                                         Treasurer
                                                 (Duly Authorized Officer)

Date: August 14, 2001                     By: /s/ Justin D. Benincasa
                                             ----------------------------------
                                                    Justin D. Benincasa
                                                 Senior Vice President and
                                                    Corporate Controller
                                                 (Duly Authorized Officer)


                                      33