SECOND AMENDMENT TO LOAN AGREEMENT



 Exhibit 10.1 
  
 SECOND AMENDMENT TO LOAN AGREEMENT 
  
 THIS SECOND AMENDMENT TO LOAN AGREEMENT, dated as of the 26th day of May, 2005 (this “Amendment”), is made
by and among AMERICAN TOWER, L.P., a Delaware limited partnership (“AT LP”), AMERICAN TOWERS, INC., a Delaware corporation (“AT Inc.”), AMERICAN TOWER, LLC, a Delaware limited liability company (“AT
LLC”) and AMERICAN TOWER INTERNATIONAL, INC., a Delaware corporation (collectively, with AT LP, AT Inc., and AT LLC, the “Borrowers”), THE FINANCIAL INSTITUTIONS SIGNATORIES HERETO and TORONTO DOMINION (TEXAS) LLC, as
administrative agent (in such capacity, the “Administrative Agent”). 
  
 W I T N E S S E T H: 
  
 WHEREAS, the Borrowers, the Lenders (as defined therein), the Issuing Bank (as defined therein) and the Administrative Agent are all parties to that
certain Loan Agreement dated as of May 24, 2004 (as hereafter amended, modified, restated and supplemented from time to time, the “Loan Agreement”); and 
  
 WHEREAS, the Borrowers have requested amendments to certain provisions of the Loan Agreement, and, subject to the terms and
conditions set forth herein, the Lenders are willing to amend certain provisions of the Loan Agreement as more specifically set forth herein; 
  
 NOW, THEREFORE, in consideration of the premises set forth above, and other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the parties hereto hereby agree that all capitalized terms used and not defined herein shall have the meanings ascribed to such terms in the Loan Agreement, and further hereby agree as follows: 
  
 1. Amendments to Loan Agreement. 
  
 (a) Amendment to Section1.1. 
  
 (i) Section 1.1 of the Loan Agreement, Definitions,
is hereby amended by inserting the following at the beginning of such Section 1.1: 
  
 “‘7.125% Senior Notes Due 2012’ shall mean the $500,000,000 original principal amount of 7.125% senior notes due
2012 and issued pursuant to the indenture dated October 5, 2004, as supplemented.” 
  
 (ii) Section 1.1 of the Loan Agreement is hereby further amended by inserting the following in place of the current definition of
“Cash on Hand (Borrowers)”: 
  
 “‘Cash on Hand (Borrowers)’ shall mean $233,000,000.” 
  
 (b) Amendment of Section 2.15. Section 2.15 of the Loan Agreement, Incremental Facility Advances, is hereby amended by deleting subsection (a) thereof in its entirety and substituting in lieu thereof the
following: 







 “(a) Subject to the terms and conditions of this Agreement, the Borrowers may
request an Incremental Facility Commitment (which may be in the form of a revolver (to the extent such Incremental Facility Commitment is a Refinancing Incremental Facility (as defined below) of the Revolving Loan Commitment) or a term loan) on any
Business Day; provided, however, that (i) the Borrowers may not request any Incremental Facility Commitment or an Incremental Facility Advance after the occurrence and during the continuance of a Default or an Event of Default,
including, without limitation, any Default or Event of Default that would result after giving effect to any Incremental Facility Advance, (ii) the aggregate amount of Incremental Facilities, the proceeds of which do not refinance the Loans (a
“Non-Refinancing Incremental Facility”), shall not exceed $500,000,000.00 and (iii) the aggregate amount of Incremental Facilities the entire net proceeds of which are used to refinance all or any portion of the Loans or the
Revolving Loan Commitment (which Revolving Loan Commitment shall be reduced by the corresponding amount of such net proceeds or canceled if the entire Revolving Loan Commitment is being refinanced) shall be unlimited (a “Refinancing
Incremental Facility”), provided that the amount of any Refinancing Incremental Facility shall be limited to the principal amount, accrued interest, fees and premiums payable with respect to the Loans or Revolving Loan Commitment
being refinanced and any costs and expenses incurred to effect any such refinancing. Any repayment of the Term Loan A Loans or Term Loan B Loans, as applicable, from the proceeds of an Incremental Facility shall be applied pro rata across the
remaining scheduled repayments set forth in Sections 2.7(b)(i) and 2.7(b)(ii) hereof, and any repayment of the Revolving Loans, if applicable, shall reduce the Revolving Loan Commitments in an amount equal to such repayment. No Incremental Facility
Maturity Date (x) for a Non-Refinancing Incremental Facility shall be earlier than six (6) months after the Term Loan B Maturity Date (without giving effect to the proviso set forth in such definition) and (y) for a Refinancing Incremental Facility
shall be earlier than the Maturity Date for the Loans being refinanced with the proceeds of such Refinancing Incremental Facility. The decision of any Lender to provide an Incremental Facility Commitment to the Borrowers shall be at such
Lender’s sole discretion and shall be made in writing. The Incremental Facility Commitment of a Lender providing an Incremental Facility Commitment shall be evidenced by an Incremental Facility Note. Persons not then Lenders may be included as
Lenders holding a portion of such Incremental Facility Commitment with the written approval of the Borrowers and the Administrative Agent (such approval not to be unreasonably withheld, delayed, or conditioned). The Incremental Facility Commitments
shall be governed by this Agreement and the other Loan Documents and be on terms and conditions no more restrictive than those set forth herein and therein. The terms and conditions in this Section 2.15 may be amended with the consent of the
Majority Lenders and the Borrowers, except to the extent that a specific Lender’s consent is otherwise required with respect to an issuance by such Lender of any Incremental Facility Commitment.” 
  
 (c) Amendment to Section 5.10. Section 5.10 of the Loan Agreement,
Use of Proceeds, is hereby amended by deleting subsection (b) thereof in its entirety and substituting in lieu thereof the following: 
  
 “(b) with respect to all proceeds: 
  

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 (i) to refinance or repurchase Indebtedness for Money Borrowed of the Borrowers and, to
the extent permitted under Section 7.7 hereof, the Parent; 
  
 (ii) to fund Acquisitions and Investments (including, without limitation, investments in Unrestricted Subsidiaries) permitted under Section 7.6 hereof; 
  
 (iii) to make Restricted Payments to the extent permitted under Section 7.7 hereof; 
  
 (iv) to fund Capital Expenditures; 
  
 (v) for working capital needs and other general corporate
purposes of the Borrowers and the Restricted Subsidiaries; and 
  
 (vi) fees and expenses incurred in connection with the execution and delivery of this Agreement, and other costs associated with transactions contemplated by this Agreement.” 
  
 (d) Amendment to Section 6.1. Section 6.1 of the Loan Agreement,
Quarterly Financial Statements and Information, is hereby amended by deleting such section in its entirety and substituting in lieu thereof the following: 
  
 “Section 6.1 Quarterly Financial Statements and Information. Within forty-five (45) days after
the last day of each of the first three (3) quarters of each fiscal year of the Borrowers, the balance sheet of the Borrowers on a consolidated basis with the Restricted Subsidiaries as at the end of such quarter and as of the end of the preceding
fiscal year, and the related statement of operations and the related statement of cash flows of the Borrowers on a consolidated basis with the Restricted Subsidiaries for such quarter and for the elapsed portion of the year ended with the last day
of such quarter, which shall set forth in comparative form 

  

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such figures as at the end of and for such quarter and appropriate prior period and shall be certified by the chief financial officer of AT Inc. to have been
prepared in accordance with GAAP and to present fairly in all material respects the financial position of the Borrowers on a consolidated basis with the Restricted Subsidiaries as at the end of such period and the results of operations for such
period, and for the elapsed portion of the year ended with the last day of such period, subject only to normal year-end and audit adjustments. If the aggregate operating revenue of the Unrestricted Subsidiaries at the end of a fiscal quarter is
equal to or greater than twenty percent (20%) of the aggregate operating revenue of the Borrowers and their Restricted Subsidiaries at the end of such quarter, the Borrowers shall provide, in addition to the foregoing financial statements and
information, the balance sheet of the Borrowers on a consolidating basis with the Unrestricted Subsidiaries as at the end of such quarter and as of the end of the preceding fiscal year, and the related statement of operations and the related
statement of cash flows of the Borrowers on a consolidating basis with the Unrestricted Subsidiaries for such quarter and for the elapsed portion of the year ended with the last day of such quarter, which shall set forth in comparative form such
figures as at the end of and for such quarter and appropriate prior period and shall be certified by the chief financial officer of AT Inc. to have been prepared in accordance with GAAP and to present fairly in all material respects the financial
position of the Borrowers on a consolidating basis with the Unrestricted Subsidiaries as at the end of such period and the results of operations for such period, and for the elapsed portion of the year ended with the last day of such period, subject
only to normal year-end and audit adjustments.” 
  
 (e)
Amendment to Section 6.2. Section 6.2 of the Loan Agreement, Annual Financial Statements and Information, is hereby amended by deleting such section in its entirety and substituting in lieu thereof the following: 
  
 “Section 6.2 Annual Financial Statements and
Information. Within ninety (90) days after the end of each fiscal year of the Borrowers, the audited consolidated balance sheet of the Borrowers and the Restricted Subsidiaries as of the end of such fiscal year and the related audited
consolidated statement of operations for such fiscal year and for the previous fiscal year, the related audited consolidated statements of cash flow and stockholders’ equity for such fiscal year and for the previous fiscal year, which shall be
accompanied by an opinion of Deloitte & Touche, LLP, or other independent certified public accountants of recognized national standing reasonably acceptable to the Administrative Agent, together with a statement of such accountants (unless the
giving of such statement is contrary to accounting practice for the continuing independence of such accountant) that in connection with their audit, nothing came to their attention that caused them to believe that the Borrowers were not in
compliance with the terms, covenants, provisions or conditions of Sections 7.8, 7.9, 7.10 and 7.11 hereof insofar as they relate to accounting matters. If the aggregate operating revenue of the Unrestricted Subsidiaries at the end of a fiscal year
is equal to or greater than twenty percent (20%) of the aggregate operating revenue of the Borrowers and their Restricted Subsidiaries at the end of such fiscal year, the Borrowers shall provide, in addition to the foregoing financial statements and
information, the consolidating balance sheet of the Borrowers and the Unrestricted Subsidiaries as of the end of such fiscal year and the related unaudited consolidating statements of operations and cash flows for such fiscal year and for the
previous fiscal year.” 
  
 (f) Amendment to Section
6.3. Section 6.3 of the Loan Agreement, Performance Certificates, is hereby amended by deleting the “and” and “.” at the end of clauses (c) and (d), respectively, and by inserting the following new clause (e) at the
end of such Section: 
  
 “; and (e) setting
forth as and at the end of such quarterly period or fiscal year, as the case may be, the Consolidated Leverage Ratio for such period, together with the arithmetical calculations required to establish the Consolidated Leverage Ratio.”

  
 (g) Amendment to Section 7.4. Section 7.4 of the Loan
Agreement, Liquidation, Merger or Disposition of Assets, is hereby amended by deleting subsection (a) thereof in its entirety and substituting in lieu thereof the following: 
  

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 “(a) Disposition of Assets. The Borrowers shall not, and shall not permit any
of the Restricted Subsidiaries to, at any time sell, lease, abandon, or otherwise dispose of any assets (other than assets disposed of in the ordinary course of business) without the prior written consent of the Majority Lenders; provided,
however, that the prior written consent of the Lenders shall not be required for (i) the transfer of assets (including cash or cash equivalents) among the Borrowers and the Restricted Subsidiaries (excluding Subsidiaries of such Persons
described in clause (b) of the definition of “Subsidiary”) or the transfer of assets (including cash or cash equivalents) between or among Restricted Subsidiaries (excluding Subsidiaries of such Persons described in clause (b) of the
definition of “Subsidiary”) or (ii) the disposition of assets (A) in any quarter that contribute, in the aggregate, together with all other assets disposed of during such quarter less than fifteen percent (15%) of Annualized Operating Cash
Flow of the Borrowers and the Restricted Subsidiaries as of the calendar quarter end immediately preceding such disposition and (B) after April 1, 2004, that contribute, in the aggregate, together with all other assets disposed of since April 1,
2004, Operating Cash Flow (Towers) and Operating Cash Flow (Other Business) of the Borrowers and the Restricted Subsidiaries for the period from April 1, 2004 through the end of the calendar quarter immediately preceding such disposition, less than
twenty-five percent (25%) of the total Operating Cash Flow (Towers) and Operating Cash Flow (Other Business) of the Borrowers and the Restricted Subsidiaries for the period from April 1, 2004 through the end of the calendar quarter immediately
preceding such disposition; provided, further, however, that, in each case under clause (ii) hereof, no Default or Event of Default exists and none shall be caused to occur as a result thereof. Upon any sale or disposition of a
Restricted Subsidiary permitted hereunder, the Administrative Agent and the Lenders shall, at the Borrowers’ expense, take such actions as the Borrowers reasonably request to cause such Restricted Subsidiary to be released from its obligations
under the Loan Documents to which it is a party.” 
  
 (h)
Amendment to Section 7.6. Section 7.6 of the Loan Agreement, Investments and Acquisitions, is hereby amended by deleting subsections (b) and (c) thereof in their entirety and substituting in lieu thereof the following: 
  
 “(b) so long as no Default then exists or would be
caused thereby, establish Unrestricted Subsidiaries and make Investments in (i) such Unrestricted Subsidiaries (in addition to Investments permitted under Sections 7.6(d) and (f) hereof), and (ii) Persons (other than any Verestar Entity) primarily
engaged in domestic and foreign communications tower, tower management and related businesses (but not primarily Teleport Businesses), directly or indirectly; provided that except (x) to the extent such Investments are made with cash proceeds
from the issuance of Capital Stock of the Parent, or (y) if, after giving effect to such Investment, the Consolidated Leverage Ratio would be less than or equal to 6.50 to 1.00, the aggregate Net Investment Amount (after giving effect to such
additional Investment) made pursuant to the provisions of this Section 7.6(b) shall not exceed, from and after the Agreement Date, the sum of (A) the aggregate amount of Excess Cash Flow for each of the preceding fiscal quarters (commencing with the
fiscal quarter ending March 31, 2004), (B) Cash on Hand (Borrowers), (C) cash contributed as equity to any Borrower by the Parent following the Agreement Date, (D) the amount of any income tax refunds received by any Borrower or 

  

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any Restricted Subsidiary after the Agreement Date, and (E) an amount equal to the sum of all amounts available to be borrowed as Revolving Loans on such
date, and all amounts available to be borrowed for such purpose as Incremental Facility Loans on such date, less any portion of such Excess Cash Flow, Cash on Hand (Borrowers), cash contributions and income tax refunds used in accordance with
Section 7.7(a) and Section 7.15 hereof; provided further that, in the case of Investments made pursuant to clause (ii) of this Section 7.6(b), the Parent, any Borrower or any of the Restricted Subsidiaries has executed a binding acquisition,
merger, lease/sublease or management agreement with such Person and that notwithstanding the foregoing Unrestricted Subsidiaries may make Investments and Acquisitions otherwise prohibited under this Section 7.6 hereof (provided,
however, that Unrestricted Subsidiaries shall, from and after the Agreement Date, make Investments only (1) in Persons primarily engaged in domestic and foreign communications tower, tower management and related businesses (but not primarily
Teleport Businesses) and (2) as permitted pursuant to Section 7.6(a) hereof); 
  
 (c) so long as no Default then exists or would be caused thereby, and subject to compliance with Section 5.13 hereof, make Acquisitions; provided, however, that (x) any Acquisition of any Person that is
not a Restricted Subsidiary by any Borrower or any of the Restricted Subsidiaries, which Person shall then become consolidated with any Borrower or any of the Restricted Subsidiaries in accordance with GAAP, shall be of a Person primarily engaged in
the tower, tower management or related businesses and not primarily engaged in the Teleport Businesses and (y) any Acquisition by any Borrower or any of the Restricted Subsidiaries of all or any substantial part of the assets of any Person that is
not a Restricted Subsidiary shall be from a Person primarily engaged in the tower, tower management or related businesses and not primarily engaged in the Teleport Businesses;” 
  
 (i) Amendment to Section 7.7. Section 7.7 of the Loan Agreement, Restricted Payments, is hereby amended by
deleting such section in its entirety and substituting in lieu thereof the following: 
  
 “Section 7.7 Restricted Payments. The Borrowers shall not, and shall not permit any of the Restricted Subsidiaries to,
directly or indirectly declare or make any Restricted Payment; provided, however, that so long as no Default or Event of Default hereunder then exists or would be caused thereby, the Borrowers may make, (a) cash distributions to the
Parent in an aggregate amount for all Borrowers not to exceed the sum of (i) the aggregate amount of Excess Cash Flow for each of the preceding fiscal quarters (commencing with the fiscal quarter ending March 31, 2004), (ii) Cash on Hand
(Borrowers), (iii) cash contributed as equity to any Borrower by the Parent following the Agreement Date, and (iv) the amount of any income tax refunds received by any Borrower or any Restricted Subsidiary after the Agreement Date, less any portion
of such Excess Cash Flow, Cash on Hand (Borrowers), cash contributions and income tax refunds used in accordance with Section 7.6(b) and Section 7.15 hereof; (b) distributions to the Parent to make scheduled principal and 

  

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interest payments on the Convertible Notes, the Senior Notes Due 2009, the Senior Notes Due 2012 and the 7.125% Senior Notes Due 2012 and any refinancings
thereof that would not cause a Default under Section 8.1(n) hereof; (c) distributions to the Parent to make scheduled principal and interest payments on the Indebtedness permitted under Sections 8.1(n)(vii), (viii), (ix) and (x) hereof; (d)
distributions to the Parent (including distributions from proceeds of the Loans) to prepay, redeem, otherwise retire or repurchase (including payment of premiums and accrued interest associated therewith) all or any portion of Indebtedness for Money
Borrowed of the Parent outstanding on the Agreement Date (excluding any Indebtedness for Money Borrowed of the Parent relating exclusively to any Verestar Entity); (e) distributions to the Parent on any date in an amount not to exceed the sum of all
amounts available to be borrowed as Revolving Loans on such date, and all amounts available to be borrowed for such purpose as Incremental Facility Loans on such date for the purpose of (i) repurchasing at the then prevailing market price the
Capital Stock of the Parent or (ii) for paying dividends on the Capital Stock of the Parent; and (f) notwithstanding anything to the contrary herein (but subject to there not being any Default or Event of Default at the time of such Restricted
Payment and after giving pro forma effect thereto), any Restricted Payment so long as, after giving pro forma effect to such Restricted Payment, the Consolidated Leverage Ratio would be less than or equal to 6.50 to 1.00.” 
  
 (j) Amendment to Section 7.15. Section 7.15 of the Loan Agreement,
Prepayments on Subordinated Debt, is hereby amended by deleting such section in its entirety and substituting in lieu thereof the following: 
  
 “Section 7.15 Prepayments on Subordinated Debt. The Borrowers shall not nor shall they permit any Restricted Subsidiary to
make (a) any prepayment of principal or interest on any Indebtedness which by its terms is subordinated to the Obligations or (b) any payment of principal or interest on the 2003 Senior Subordinated Discount Notes or the November 2003 Senior
Subordinated Notes that is in violation of the subordination provisions with respect thereto, except, in the case of clauses (a) and (b), (x) in connection with a refinancing thereof permitted under this Agreement or (y) so long as no Default or
Event of Default hereunder then exists or would be caused thereby.” 
  
 (k) Amendment to Section 8.1. Section 8.1 of the Loan Agreement, Events of Default, is hereby amended by deleting subsection (n) thereof in its entirety and substituting in lieu thereof the following:

  
 “(n) the Parent shall incur or permit to
remain outstanding any Indebtedness for Money Borrowed other than (i) the Convertible Notes, (ii) the Senior Notes Due 2009, (iii) the Senior Notes Due 2012 and the 7.125% Senior Notes Due 2012, (iv) that certain Guaranty Agreement dated as of
February 10, 2000 made by the Parent in favor of TV Azteca and Television Azteca, S.A. de C.V., a sociedad anonima de capital variable organized under the laws of Mexico, (v) that certain guaranty made by the Parent of the Indebtedness under the
2003 Senior Subordinated Discount Notes and the November 2003 Senior Subordinated Notes and any permitted refinancings thereof, (vi) any guaranty by the Parent of the Obligations, (vii) Indebtedness, the net cash proceeds of which are used to
refinance or repurchase all or any portion of the 2003 Senior Subordinated Discount Notes or the November 2003 Senior Subordinated Notes or any refinancings thereof, so long as such Indebtedness is in a principal amount not exceeding 

  

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the accreted value or principal amount of the Indebtedness being refinanced or the then-current market value of the Indebtedness being repurchased, as
applicable (plus any accrued interest thereon, the amount of any premiums required by the terms thereof and any costs and expenses incurred to effect such refinancing or repurchase or any permitted refinancing thereof) and the maturity date of such
refinancing Indebtedness is no earlier than the maturity date of the Indebtedness being refinanced; provided, however, that any Restricted Payments necessary to make payments on such Indebtedness shall be subject to Section 7.7 hereof,
(viii) (A) additional unsecured Indebtedness; provided that the net cash proceeds thereof are promptly used to refinance or repurchase all or any portion of any Indebtedness of the Parent or the Loans (including any premiums and accrued
interest required to be paid for such Indebtedness being refinanced or repurchased and any costs and expenses incurred to effect such refinancing or repurchase), and (B) any refinancing or repurchase of the foregoing, the net cash proceeds of which
do not exceed the outstanding principal amount of the Indebtedness being refinanced or the then current market value of the Indebtedness being repurchased, as applicable, on the date of such refinancing or repurchase, plus accrued interest thereon,
premiums payable with respect thereto and any costs and expenses incurred in connection with such refinancing or repurchase, and the maturity date of such refinancing Indebtedness is no earlier than the maturity date of the Indebtedness being
refinanced, (ix) (A) additional unsecured Indebtedness the net cash proceeds of which are, within ninety (90) days thereafter, downstreamed to a Borrower as equity and used for the payment of all or a portion of the purchase price of Acquisitions by
any Borrower or any Restricted Subsidiary permitted hereunder or Investments in or Acquisitions by any Unrestricted Subsidiary; provided that no such Indebtedness in this Section 8.1(n)(ix) shall be permitted if, after giving pro forma effect
to the incurrence of such Indebtedness and Operating Cash Flow associated with such Acquisition, the Consolidated Leverage Ratio would be greater than 7.50 to 1.00, and (B) any refinancing or repurchase of the foregoing, the net cash proceeds of
which do not exceed the outstanding principal amount of the Indebtedness being refinanced or the then current market value of the Indebtedness being repurchased, as applicable, on the date of such refinancing or repurchase, plus accrued interest
thereon, premiums payable with respect thereto and any costs and expenses incurred in connection with such refinancing or repurchase, and the maturity date of such refinancing Indebtedness is no earlier than the maturity date of the Indebtedness
being refinanced, and (x) (A) additional unsecured Indebtedness, the net cash proceeds of which are used for any corporate purposes of the Parent or the Borrowers, including, without limitation, for (1) the repurchase of shares of the Capital Stock
of the Parent at the then prevailing market price or (2) paying dividends on the Capital Stock of the Parent; provided that no such Indebtedness in this Section 8.1(n)(x) shall be permitted if, after giving pro forma effect to the incurrence
of such Indebtedness, the Consolidated Leverage Ratio would be greater than 6.50 to 1.00, and (B) any refinancing or repurchase of the foregoing, the net cash proceeds of which do not exceed the outstanding principal amount of the Indebtedness being
refinanced or the then current market value of the Indebtedness being repurchased, as applicable, on the date of such refinancing or repurchase, plus accrued interest thereon, premiums payable with respect thereto and any costs and expenses incurred
in connection with such refinancing or repurchase, and the maturity date of such refinancing Indebtedness is no earlier than the maturity date of the Indebtedness being refinanced; or” 
  

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 2. No Other Amendments. Except for the amendments and consent set forth above, the text of the
Loan Agreement and all other Loan Documents shall remain unchanged and in full force and effect. No amendment, waiver or consent by the Administrative Agent, the Issuing Bank or the Lenders under the Loan Agreement or any other Loan Document is
granted or intended except as expressly set forth herein, and the Administrative Agent, the Issuing Bank and the Lenders expressly reserve the right to require strict compliance in all other respects (whether or not in connection with any Requests
for Advance). Except as set forth herein, the amendments agreed to herein shall not constitute a modification of the Loan Agreement or any of the other Loan Documents, or a course of dealing with the Administrative Agent, the Issuing Bank and the
Lenders at variance with the Loan Agreement or any of the other Loan Documents, such as to require further notice by the Administrative Agent, the Issuing Bank, the Lenders or the Majority Lenders to require strict compliance with the terms of the
Loan Agreement and the other Loan Documents in the future. In accordance with the foregoing, the Loan Documents shall be deemed to be amended solely to the extent necessary to give effect to the amendments set forth herein. 
  
 3. Conditions Precedent. The effectiveness of this Amendment is
subject to: 
  
 (a) receipt by the Administrative Agent of duly
executed signature pages evidencing the consent of the Majority Lenders to the amendments set forth herein; and 
  
 (b) the representations and warranties contained in Article 4 of the Loan Agreement and contained in the other Loan Documents remaining true and correct
in all material respects as of the date hereof, both before and after giving effect to this Amendment, except to the extent previously fulfilled in accordance with the terms of the Loan Agreement or such other Loan Document, as applicable, or to the
extent relating specifically to the earlier date. No Default or Event of Default now exists or will be caused hereby. 
  
 4. Counterparts. This Amendment may be executed in any number of counterparts, each of which shall be deemed to be an original, but all such
separate counterparts shall together constitute but one and the same instrument. 
  
 5. Governing Law. This Amendment shall be construed in accordance with and governed by the laws of the State of New York without regard to conflicts of laws principles (other than Section 5-1401 of the New York
General Obligations Law) thereof. 
  
 6. Severability. Any
provision of this Amendment which is prohibited or unenforceable shall be ineffective to the extent of such prohibition or unenforceability without invalidating the remaining provisions hereof in that jurisdiction or affecting the validity or
enforceability of such provision in any other jurisdiction. 
  
 7.
Guarantor Acknowledgment. 
  
 (a) Each of ATC GP, Inc.,
ATC LP, Inc., ATS/PCS, LLC, New Loma Communications, Inc., ATC Tower Services, Inc., UniSite, LLC, American Tower Delaware 

  

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Corporation, American Tower Management, LLC, ATC Midwest, LLC, Telecom Towers, L.L.C., Shreveport Tower Company, ATC South LLC, MHB Tower Rentals of America,
LLC, ATC International Holding Corp., Iron & Steel Co., Inc., Columbia Steel, Inc., ATC Mexico Holding Corp., ATC MexHold, Inc., ATC South America Holding Corp., American Tower Corporation de Mexico S. de R.L. de C.V., MATC Celular S. de R.L. de
C.V., MATC Digital S. de R.L. de C.V., MATC Servicios, S. de R.L. de C.V. and Towers of America, L.L.L.P. are collectively referred to herein as the “Guarantors,” and the Guaranties executed by the Guarantors are collectively referred to
herein as the “Guaranties.” 
  
 (b) Each Guarantor
hereby acknowledges that it has reviewed the terms and provisions of the Loan Agreement and this Amendment. Each Guarantor hereby confirms that the Guaranty to which it is a party or otherwise bound will continue to guarantee, as the case may be, to
the fullest extent possible in accordance with such Guaranty the payment and performance of all “Guarantied Obligations” under each of the Guaranties, as the case may be (in each case as such term is defined in the applicable Guaranty),
including without limitation the payment and performance of all Obligations of the Borrowers now or hereafter existing under or in respect of the Loan Agreement and the Notes defined therein. 
  
 (c) Each Guarantor acknowledges and agrees that any of the other Loan
Documents to which it is a party or otherwise bound shall continue in full force and effect and that all of its obligations thereunder shall be valid and enforceable, subject, as to enforcement of remedies, to applicable bankruptcy, insolvency,
fraudulent conveyance, reorganization, moratorium and similar laws affecting creditors’ rights and remedies generally, and subject, as to enforceability, to general principles of equity, and shall not be impaired or limited by the execution or
effectiveness of this Amendment. Each Guarantor represents and warrants that all representations and warranties contained in the Loan Agreement, this Amendment and any other Loan Documents to which it is a party or otherwise bound are true, correct
and complete in all material respects on and as of the date hereof to the same extent as though made on and as of that date, except to the extent such representations and warranties specifically relate to an earlier date, in which case they were
true, correct and complete in all material respects on and as of such earlier date. 
  
 (d) Each Guarantor acknowledges and agrees that (i) notwithstanding the conditions to effectiveness set forth in this Amendment, such Guarantor is not required by the terms of the Loan Agreement or any other Loan
Document to consent to the amendments of the Loan Agreement effected pursuant to this Amendment and (ii) nothing in the Loan Agreement, this Amendment or any other Loan Document shall be deemed to require the consent of such Guarantor to any future
amendments to the Loan Agreement. 
  

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 IN WITNESS WHEROF, the parties hereto have executed this Amendment or caused it to be executed by their
duly authorized officers, all as of the day and year first above written. 
  
 BORROWERS: 
 AMERICAN TOWER, L.P., 
 a Delaware limited partnership 
  
 By: /s/ Bradley E. Singer  
         Name: Bradley E. Singer 
         Title: Chief Financial Officer 
  
 AMERICAN TOWERS, INC., 
 a Delaware corporation 
  
 By: /s/ Bradley E. Singer  
         Name:
Bradley E. Singer 
         Title: Chief Financial Officer 
  
 AMERICAN TOWER, LLC, 
 a Delaware limited liability company 
  
 By: /s/ Bradley E. Singer  
         Name: Bradley E. Singer 
         Title: Chief Financial Officer 
  
 AMERICAN TOWER INTERNATIONAL, INC., 
 a Delaware corporation 
  
 By: /s/ Bradley E. Singer  
         Name:
Bradley E. Singer 
         Title: Treasurer 
  
 SECOND AMENDMENT TO LOAN AGREEMENT 
 Signature Page 







 GUARANTORS: 
 ATC GP, INC. 
  
 By: /s/ Bradley E. Singer  
         Name: Bradley E. Singer

         Title: Chief Financial Officer & Treasurer 
  
 ATC LP, INC. 
  
 By: /s/ Bradley E. Singer  
         Name: Bradley E. Singer 
         Title: Chief Financial Officer & Treasurer 
  
 ATS/PCS, LLC 
  
 By: AMERICAN TOWER, L.P., 
         its general partner and its sole member 
         (as applicable) 
  
 By: ATC GP, INC., its general partner 
  
 By: /s/ Bradley E. Singer  
         Name: Bradley E. Singer 
         Title: Chief Financial Officer & Treasurer 
  
 TOWERS OF AMERICA, L.L.L.P. 
  
 By: AMERICAN TOWER, L.P., 
         its general partner and its sole member 
         (as applicable) 
  
 By: ATC GP, INC., its general partner 
  
 By: /s/ Bradley E. Singer  
         Name: Bradley E. Singer 
         Title: Chief Financial Officer & Treasurer 
  
 SECOND AMENDMENT TO LOAN AGREEMENT 
 Signature Page 







 NEW LOMA COMMUNICATIONS, INC. 
  
 By: /s/ Bradley E. Singer  
         Name: Bradley E. Singer 
         Title: Chief Financial Officer & Treasurer 
  
 ATC TOWER SERVICES, INC. 
  
 By: /s/ Bradley E. Singer  
         Name: Bradley E. Singer 
         Title: Chief Financial Officer & Treasurer 
  
 UNISITE, LLC 
  
 By: AMERICAN TOWERS, INC., 
         its sole member and manager 
  
 By: /s/ Bradley E. Singer  
         Name: Bradley E. Singer 
         Title: Chief Financial Officer & Treasurer 
  
 AMERICAN TOWER DELAWARE CORPORATION 
  
 By: /s/ Bradley E. Singer  
         Name: Bradley E. Singer 
         Title: Chief Financial Officer & Treasurer 
  
 AMERICAN TOWER MANAGEMENT, LLC 
  
 By: AMERICAN TOWERS, INC., 
         its sole member and manager 
  
 By: /s/ Bradley E. Singer  
         Name: Bradley E. Singer 
         Title: Chief Financial Officer & Treasurer 
  
 SECOND AMENDMENT TO LOAN AGREEMENT 
 Signature Page 







 ATC MIDWEST, LLC 
  
 By: AMERICAN TOWER MANAGEMENT, INC., 
         its sole member and manager 
  
 By: /s/ Bradley E. Singer  
         Name: Bradley E. Singer 
         Title: Chief Financial Officer & Treasurer 
  
 TELECOM TOWERS, L.L.C. 
  
 By: AMERICAN TOWERS, INC. 
         its sole member and manager 
  
 By: /s/ Bradley E. Singer  
         Name: Bradley E. Singer 
         Title: Chief Financial Officer & Treasurer 
  
 SHREVE PORT TOWER COMPANY 
  
 By: TELECOM TOWERS, L.L.C. and ATC SOUTH, LLC, 

        its general partners 
  
 By: AMERICAN TOWERS, INC. 
         their sole member and manager 
  
 By: /s/ Bradley E. Singer  
         Name: Bradley E. Singer 
         Title: Chief Financial Officer & Treasurer 
  
 ATC SOUTH LLC 
  
 By: AMERICAN TOWERS, INC. 
         its sole member and manager 
  
 By: /s/ Bradley E. Singer  
         Name: Bradley E. Singer 
         Title: Chief Financial Officer & Treasurer 
  
 SECOND AMENDMENT TO LOAN AGREEMENT 
 Signature Page 







 MHB TOWER RENTALS OF AMERICA, LLC 
  
 By: ATC SOUTH, LLC, its sole member 
  
 By: AMERICAN TOWERS, INC. 
         its sole member and manager 
  
 By: /s/ Bradley E. Singer  
         Name: Bradley E. Singer 
         Title: Chief Financial Officer & Treasurer 
  
 ATC INTERNATIONAL HOLDING CORP. 
  
 By: /s/ Bradley E. Singer  
         Name: Bradley E. Singer 
         Title: Chief Financial Officer & Treasurer 
  
 IRON & STEEL CO., INC. 
  
 By: /s/ William H. Hess  
         Name: William H. Hess 
         Title: Executive Vice President 
  
 COLUMBIA STEEL, INC. 
  
 By: /s/ William H. Hess  
         Name: William H. Hess 
         Title: Executive Vice President 
  
 ATC MEXICO HOLDING CORP. 
  
 By: /s/ William H. Hess  
         Name: William H. Hess 
         Title: Chief Financial Officer 
  
 SECOND AMENDMENT TO LOAN AGREEMENT 
 Signature Page 







 ADMINISTRATIVE AGENT 
 AND
LENDERS: 
 TORONTO DOMINION (TEXAS) LLC, 
 as Administrative Agent and as a Lender 
  
 By: /s/ Jim Bridwell  
         Name: Jim Bridwell 
         Title: Authorized Signatory 
  
 BABSON CLO LTD 2005-I 
  
 By: Babson Capital Management LLC as Collateral Manager 
  
 By: /s/ David P. Wells  
         Name: David P. Wells 
         Title: Managing Director 
  
 CALYON, NEW YORK BRANCH, as a Lender 
  
 By: /s/ Stephane Ducroizet  
         Name: Stephane Ducroizet 
         Title: Vice President 
  
 By: /s/ John McCloskey  
         Name: John McCloskey 
         Title: Director 
  
 CITIZENS BANK OF MASSACHUSETTS, 
 as a Lender 
  
 By: /s/ Daniel G. Eastman  
         Name: Daniel G. Eastman 
         Title: Senior Vice President 
  
 SECOND AMENDMENT TO LOAN AGREEMENT 
 Signature Page 







 CITICORP NORTH AMERICA, INC., as a Lender 
  
 By: /s/ John Judge  
         Name: John Judge 
         Title: Vice President 
  
 COOPERATIEVE CENTRALE RAIFFEISEN-BOERENLEEN 
 BANK B.A., “RABOBANK INTERNATIONAL,” 
 NEW YORK BRANCH, as a Lender 
  
 By: /s/ Michael R. Phelan  
         Name: Michael R. Phelan 
         Title: Executive Director 
  
 By: /s/ Brett Delfino  
         Name: Brett Delfino 
         Title: Executive Director 
  
 CREDIT INDUSTRIEL ET COMMERCIAL, as a Lender 
  
 By: /s/ Marcus Edward  
         Name: Marcus Edward 
         Title: Vice President 
  
 By: /s/ Sean Mounier  
         Name: Sean Mounier 
         Title: First Vice President 
  
 SECOND AMENDMENT TO LOAN AGREEMENT 
 Signature Page 







 DEUTSCHE BANK TRUST COMPANY AMERICAS, as a Lender 
  
 By: /s/ Anca Trifan  
         Name: Anca Trifan 
         Title: Director 
  
 By: /s/ Paul O’ Leary  
         Name: Paul O’Leary 
         Title: Vice President 
  
 GENERAL ELECTRIC CAPITAL CORPORATION, as a Lender 
  
 By: /s/ Matthew A. Toth III  
         Name: Matthew A. Toth III 
         Title: Authorized Signatory 
  
 GOLDMAN SACHS CREDIT PARTNERS L.P., as a Lender 

 
 By: /s/ Christopher Burns  
         Name: Christopher Burns 
         Title: Vice President 
  
 JPMORGAN CHASE BANK, N.A., as a Lender 
  
 By: /s/ James L. Stone  
         Name: James L. Stone 
         Title: Managing Director 
  
 SECOND AMENDMENT TO LOAN AGREEMENT 
 Signature Page 







 KEYBANK NATIONAL ASSOCIATION, as a Lender 
  
 By: /s/ Jennifer O’Brien  
         Name: Jennifer O’Brien 
         Title: Vice President 
  
 MORGAN STANLEY SENIOR FUNDING, INC., as a Lender 
  
 By: /s/ Lisa Malone  
         Name: Lisa Malone 
         Title: Vice President 
  
 NATIONAL CITY BANK, as a Lender 
  
 By: /s/ Jon W. Peterson  
         Name: Jon W. Peterson 
         Title: Senior Vice President 
  
 ROYAL BANK OF CANADA, as a Lender 
  
 By: /s/ James F. Disher  
         Name: James F. Disher 
         Title: Authorized Signatory 
  
 TD BANKNORTH, NA, as a Lender 
  
 By: /s/ Nicolas Caussada  
         Name: Nicolas Caussada 
         Title: AVP 
  
 SECOND AMENDMENT TO LOAN AGREEMENT 
 Signature Page 







 THE BANK OF NEW YORK, as a Lender 
  
 By: /s/ Steven J. Correll  
         Name: Steven J. Correll 
         Title: Vice President 
  
 THE ROYAL BANK OF SCOTLAND PLC, as a Lender 
  
 By: /s/ Andrew Wynn  
         Name: Andrew Wynn 
         Title: Senior Vice President 
  
 UNION BANK OF CALIFORNIA, N.A., as a Lender 
  
 By: /s/ Peter Connoy  
         Name: Peter Connoy 
         Title: SVP 
  
 WEBSTER BANK, NATIONAL ASSOCIATION, as a Lender 
  
 By: /s/ Robert E. Meditz  
         Name: Robert E. Meditz 
         Title: Vice President 
  
 SECOND AMENDMENT TO LOAN AGREEMENT 
 Signature Page