Philadelphia’s skyline has always been a bit understated for an American city of its size (due in large part to a longstanding unofficial rule that no building could be taller than the statue of William Penn that stands atop the magnificent city hall) but ever since city officials began allowing developers greater leeway in the 1980s, Philly has been getting vertical. Inga Saffron says that the proliferation of skyscrapers isn’t necessarily a bad thing, but that the city’s distinct lack of an urban plan is a serious threat to Philadelphia’s distinctive look and feel. “The main issue is no longer about how high Philadelphia’s towers should go. It’s about guiding what happens on the ground.”