A room is classified as a basement when it is situated either entirely or partially below the surrounding ground level (grade) of the building. Key architectural traits include foundation walls resting directly on footings, exposed or partially subterranean concrete masonry, utility lines running overhead, and a floor level lower than the exterior soil line. Depending on how much of the wall sits above ground, it may be categorized as a full basement, cellar, or a daylight walkout lower level.
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