Changing Skyline: Phila. architects offer some homegrown ideas

It's not a new story, but the biggest and best architectural projects in Philadelphia always seem to end up in the hands of out-of-towners. The Barnes Foundation has a New York firm designing its new home. The Art Museum went to Los Angeles to snare Frank Gehry for its underground expansion. Even Drexel University chose a Minneapolis outfit to retrofit Market Street's iconic decorated shed, the ISI Building, one of Robert Venturi's important early works.