Please answer the following question: 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. Center City Tower (Philadelphia) - Center City Tower was the working name of a formerly proposed skyscraper in downtown Philadelphia.Designed and proposed by the firm now known as KlingStubbins (designers of Philadelphia's Penn Center and Bell Atlantic Tower) the building would have risen to a height of 1050 feet (320 m) and 75 stories making it the tallest building in The United States outside New York and Chicago surpassing the height of the Bank of America Plaza in Atlanta.
Answer:
Building