An Amtrak Acela Express departs Philadelphia for Wilmington, DE and points south. In the background is Philadelphia's rapidly changing skyline. The new buildings to the left are part of a development known as Cira Center South. The angular roofed building in the back is the residential Cira Chestnut Tower (also known as Evo Cira Centre South). The tower rises a total of 33 floors and 430 feet. Up closer and under construction as of July, 2015 is the commercial Cira Walnut Tower, now known as the FMC Tower. That building will be a 49-story, 730-foot tall luxury mixed-use skyscraper. Once topped out, it will be the 6th tallest building in the city of Philadelphia.