<Tr> <Th> Structural engineer </Th> <Td> Thornton Tomasetti </Td> </Tr> <Tr> <Th_colspan="2"> References </Th> </Tr> <P> The Comcast Technology Center is a skyscraper under construction in Center City, Philadelphia . The 60 - floor building, with a height of 1,121 feet (342 m), is the ninth - tallest building in the United States and the tallest outside Manhattan and Chicago . The tower is located on the southwest corner of 18th and Arch Streets, one block west of the Comcast Center, the headquarters of Comcast Corporation . A hotel--the highest in the country--and restaurant will be located on the top floors, while central floors will contain offices for Comcast software developers and engineers, and the lowest floors will have television studios and retail stores . </P> <P> Construction began in the summer of 2014, topped out on November 27, 2017, and is expected to be completed in 2018 . </P>

How tall is the new comcast building going to be