Exhibit 23
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the incorporation by reference in Registration Statement Nos. 333-127296, 333-41226, 333-41224, 333-72927, 333-56331, 333-76324 and 333-51959 each on Form S-8 and Registration Statement Nos. 333-126749, 333-109489, 333-111632, 333-114706 and 333-119162 each on Form S-3 of our report dated March 14, 2006 (November 28, 2006, as to the effects of the matters discussed in Note 2 and Note 20), relating to the financial statements of American Tower Corporation (which report expresses an unqualified opinion and includes explanatory paragraphs relating to (i) the adoption of FASB Interpretation No. 47 “Accounting for Conditional Asset Retirement Obligations-an interpretation of FASB Statement No. 143,” effective December 31, 2005 and (ii) the restatement of the consolidated financial statements as discussed in Note 2), and of our report dated March 14, 2006 (November 28, 2006 as to the effect of the material weaknesses described in Management’s Annual Report on Internal Control over Financial Reporting (as revised)) on the internal control over financial reporting (which report expresses an adverse opinion on the effectiveness of the Company’s internal control over financial reporting because of material weaknesses), appearing in this Annual Report on Form 10-K/A of American Tower Corporation for the year ended December 31, 2005.
/s/ DELOITTE & TOUCHE LLP
Boston, Massachusetts
November 28, 2006