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Kelsey Grammer has downsized ... BIG TIME!

The former Frasier star has purchased a 1926 Spanish Colonial home in West Beverly Hills for $6.875 million.

Grammer's new two-story home features six bedrooms, a separate guest house, a formal dining room, play room, media room, refrigerated wine storage and a 3-car garage.

As for his old home in Bel Air (pictured below), he has listed the mega-mansion for $18 million. Downsizing, indeed.

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See Grammer's new Beverly Hills spread in the gallery below.