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530 square perches is about one-fourth as big as Windsor Castle.
In other words, it's 0.250 times the size of Windsor Castle, and the size of Windsor Castle is 4 times that amount.
(Windsor, England) (total site area)
One of the official residences of the British monarch, Windsor Castle measures about 2,100 square perches. It is the largest inhabited castle in the world and is also the oldest in continuous use, having been occupied since it was built by William the Conqueror about 900 years ago.
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