The 1.2 million-sf, 57-story Comcast Center will markedly change Philadelphia's syline, as it's projected to rank as the 11th-tallest building in the U.S. at 975 feet. Construction began in January 2005 with completion slated for early 2008. New York architect Robert A.M. Stern, dean of the Yale school of architecture, designed the center. The associate architect on the design team is Kendall/Heaton Associates of Houston. Philadelphia's LF Driscoll Co. is the construction manager and Liberty Property Trust of Malvern, Pa., is the developer of the $435 million skyscraper. Barring design changes, the Comcast Center will surpass Cleveland's Key Tower as the tallest building between New York and Chicago, and look down on Philadelphia's current tallest building, One Liberty Place, from 30 feet higher. A half-acre landscaped park, glass-enclosed winter garden, and underground transit station are also on the drawing board for the site.