Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. G. Fred DiBona Jr. Building - 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 Blue Cross-Blue Shield affiliated organization in the five-county Philadelphia area). The tower built between 1988 and 1990 was designed by WZMH Architects who also designed the CN Tower in Toronto Canada.
Building