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In case it's not obvious: because it is extremely expensive to build & maintain, and unpleasant to live or work in subterranean spaces for extended periods of time.
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In Los Altos (SF Peninsula) there's a square footage max ~4000ft2 (can't remember exact no). So while most houses in that area were built without basements in the 50s and 60s cuz building on a slab is cheaper/easier, new big homes have basements cuz that's not included in ft2.
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