Take a stroll through iconic public spaces like New York’s High Line and Central Park or Chicago’s Millennium Park. They are stunning. They are also enormously expensive, enormously well-gifted, and seldom surrounded by lower-income neighborhoods. They are “signature” parks that the super-rich love to support. We are entering a new golden age of parks philanthropy. Tulsa just received a $350 million gift to create its own signature park—the biggest gift to a city public park in history. When Wal…