Grand civic ges­tures, cour­tesy entre­pre­neurial public-​​private part­ner­ships, and some deep-​​pocketed donors are pumping new life into some old guard cities, among them New York and Philadel­phia, where urban parks are “in” and plan­ners speak of the “High­line effect” as they once did of the “Bilbao effect.”

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