The G. Fred DiBona Jr. Building, formerly known as the Blue Cross-Blue Shield Tower or IBX Tower, is a skyscraper in Philadelphia, Pennsylvania housing the headquarters of Independence Blue Cross. The tower, built between 1988 and 1990, was designed by WZMH Architects, who also designed the CN Tower in Toronto, Ontario, Canada. It was renamed in 2005 after the company's president and CEO, who died of a brain tumor at age 53.