The Comcast Center in Philadelphia is not only the city's tallest structure, at 975 feet, but also the tallest sustainable building in the country.
As the Philadelphia Inquirer wrote last May:
Without a doubt, the Comcast Center at 17th Street and JFK Boulevard is a respectable work of architecture. The 58-story tower is clean in its lines, dignified in its stance on the grid, generous in its relationship to the city, responsible in its treatment of the environment.
Its developer, Liberty Property Trust, can boast - for the moment, anyway - that it is the tallest green building in the country, an achievement of no small import.
Check out the photo below and read more about the building here.