On October 20, 2009, Crown Castle International Corp. ("Company") entered into an underwriting agreement ("Underwriting Agreement") with Barclays Capital Inc. and RBS Securities Inc., as representatives for the underwriters (collectively, "Underwriters"), pursuant to which the Company agreed to sell to the Underwriters an aggregate of $500 million of the Company's 7.125% Senior Notes due 2019 in a registered public offering ("Offering") pursuant to the Company's shelf registration statement ("Registration Statement") on Form S-3 filed on January 16, 2009 (File No. 333-156781). The Company is filing the Underwriting Agreement as Exhibit 10.1 to this report. By the filing of this report, the Company is causing this exhibit to be incorporated by reference herein and into the Registration Statement.

On October 20, 2009, the Company issued a press release announcing the pricing of the Offering. A copy of the press release is attached as Exhibit 99.1 to this report.

(d) Exhibits

Exhibit No.       Description
   10.1           Underwriting Agreement dated October 20, 2009, between Crown
                  Castle International Corp., Barclays Capital Inc. and RBS
                  Securities Inc., as representatives for the underwriters

   99.1           Press Release dated October 20, 2009