Some 120,000 people work in Tysons Corner, Va., but only 17,000 live there. Located about 14 miles west of downtown Washington, the area is home to unfriendly buildings surrounded by parking lots. To transform this hotbed of suburban gridlock into a green, walkable city, a plan calls for as much as tripling the current square footage by expanding upward, with the tallest buildings located next to four train stations...more