Commerce Square covers an entire block, between 20th and 21st Streets and Market Street and John F. Kennedy Boulevard.
PA 252 turns northwest and heads through commercial areas as it comes to an intersection with PA 3 in the community of Newtown Square.
Route 104 initially was a streetcar line which operated parallel to the West Chester Pike (PA Route 3) and was operated by the Philadelphia Suburban Transportation Company (aka "Red Arrow Lines").
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