http://innovationphiladelphia.com/Blog/blogs/ip/archive/2008/03/17/philadelphia-home-to-the-second-tallest-building-in-the-world.aspxA Philadelphia developer is proposing to construct a 1,500 foot, $800 million building on 18th and Arch streets that will be the tallest building in the Western Hemisphere and the second-tallest building in the world. Standing 63 stories tall, the AmericanenCommunityServer 2007 SP2 (Build: 20611.960)