Correction for the size of Buckingham Palace
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How big is 0.160 square kilometers?
It's about two times as big as Buckingham Palace

The size of Buckingham Palace is about 0.077 square kilometers.
(a.k.a. Buckingham House) (Westminster, London, England)
Buckingham Palace, the official residence of the British monarch, contains about 0.077 square kilometers of total floor space. The palace was first inhabited by Queen Victoria in 1831, although after the death of her husband in 1861, the Queen endeavored to spend as little time there as public opinion would allow.