But Joshua had said unto the two men that had spied out the country, Go into the harlot's house, and bring out thence the woman, and all that she hath, as ye sware unto her.
Joshua has said ... Go into the harlot's house. It is evident that the town walls were not demolished universally, at least all at once. Rahab's house was allowed to stand until her relatives were rescued according to the promise.