Many people have walked every street in Manhattan. The local historian John McNamara, who died in 2004, walked every street in the Bronx. But Mr. Green believes he is the first to try for every block in all five boroughs -- a distance he calculates at roughly 8,000 miles, counting parks, paths, cemeteries and occasional overlaps. He estimates that the project will take him more than two years of full-time walking to complete.
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