How are downtowns doing? LAUREL WAMSLEY, BYLINE: It's lunchtime on a weekday afternoon when I meet up with Prema Katari Gupta, CEO of Philadelphia's Center City District. GUPTA: We are standing in Rittenhouse Square, which is one of the great parks in Philadelphia - really large trees, lots of people enjoying what's not even a particularly nice day. WAMSLEY: One …
