This centre offers easy access to major highways and the Regional Transportation Network, and Amtrak leaves from the concourse station to most major US cities. Within walking distance of Philadelphia's Convention Center, The Academy of Music, The Kimmel Center, Avenue of the Arts. Management consulting firm Towers Perrin is a major tenant in the east tower. The business center's neighbors include the cable company Comcast and the law firm Saul Ewing. Philadelphia has a growing knowledge-industry sector and the region includes the fourth largest retail sales market in the US. The international city is host to many consulates from around the globe and its economy is driven by innovation.