Exhibit 99.1

CROWN CASTLE ANNOUNCES PROPOSED

OFFERING OF SENIOR NOTES

July 25, 2017 - HOUSTON, TEXAS - Crown Castle International Corp. (NYSE: CCI) (“Crown Castle”) announced today that it is commencing a public offering of senior notes due 2024 and senior notes due 2027, in each case subject to market and other conditions. The notes will be issued by Crown Castle International Corp. Crown Castle intends to use the net proceeds from this offering, together with the net proceeds from its previously announced common stock offering and mandatory convertible preferred stock offering and cash on hand, to finance its previously announced acquisition of LTS Group Holdings LLC (“Lightower Acquisition”) and to pay related fees and expenses.

Morgan Stanley, Merrill Lynch, Pierce, Fenner & Smith Incorporated, Barclays, Mizuho Securities, and RBC Capital Markets are the joint book-running managers of the offering.

The offering is being made pursuant to an effective shelf registration statement filed with the Securities and Exchange Commission (“SEC”). The offering will be made only by means of a prospectus supplement and the accompanying base prospectus, copies of which may be obtained by contacting any joint book-running manager using the information provided below. An electronic copy of the preliminary prospectus supplement, together with the accompanying prospectus, is also available on the SEC’s website, www.sec.gov.

This press release shall not constitute an offer to sell or a solicitation of an offer to buy the securities described herein, nor shall there be any sale of these securities in any state or other jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

CAUTIONARY LANGUAGE REGARDING FORWARD-LOOKING STATEMENTS

This press release contains forward-looking statements that are based on Crown Castle management’s current expectations. Such statements include plans, projections and estimates regarding the proposed offering, including the use of proceeds therefrom. Such forward-looking statements are subject to certain risks, uncertainties and assumptions, including prevailing market conditions and other factors. Should one or more of these risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those expected. More information about potential risk factors that could affect Crown Castle and its results is included in Crown Castle’s filings with the SEC. The term “including,” and any variation thereof, means “including, without limitation.”

ABOUT CROWN CASTLE

Crown Castle provides wireless carriers with the infrastructure they need to keep people connected and businesses running. With approximately 40,000 towers and 60,000 route miles of fiber supporting small cells following the completion of the Lightower Acquisition, Crown Castle is the nation’s largest provider of shared wireless infrastructure with a significant presence in the top 100 U.S. markets.

JOINT BOOK-RUNNING MANAGERS CONTACT INFORMATION

The Foundation for a Wireless World.