FILE - In this Wednesday, Oct. 10, 2007, file photo, the Comcast Center skyscraper, center, stands above other buildings in Philadelphia.  On Wednesday, Jan. 15, 2014, Comcast announced plans to build  $1.2 billion, 59-story technology center that will rise 1,121 feet next to the existing Comcast Center, which stands 975 feet tall and opened in June 2008. (AP Photo/Matt Rourke, File)

FILE - In this Wednesday, Oct. 10, 2007, file photo, the Comcast Center skyscraper, center, stands above other buildings in Philadelphia. On Wednesday, Jan. 15, 2014, Comcast announced plans to build $1.2 billion, 59-story technology center that will rise 1,121 feet next to the existing Comcast Center, which stands 975 feet tall and opened in June 2008. (AP Photo/Matt Rourke, File)