Basemented

She is a widow, and she owns—mortgaged, of course—one of those old-fashioned, two-and-a-half-story, red-brick basemented houses⸺

Source: wiktionary

Moscow had many basemented buildings, and in the lowest storey safe and efficient shelters were established (see illus., p. 1850).

Source: wiktionary

The Betlers lived in a Bayswater square. A five-storeyed and basemented house of incredible inconvenience.

Source: wiktionary

A large, apparently semi-basemented, room (Room 4) was added to the rear of Room 2 in Building B.

Source: wiktionary