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530 square perches is about as as a City Block (Manhattan).
(per Bridges, William - 1811 Commissioner's Plan for New York City) (approximate)
A Manhattan city block measures about 200 m between the Northeast-Southwest streets by about 60 m between the Northwest-Southeast streets for a total area of about 400 square perches. There are roughly 2,000 blocks within the city, representing one of the most prolific applications of the city planning grid plan in history.
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