Leviticus 25:30

It shall not go out — The reasons before alledged for lands do not hold in such houses; there was no danger of confusion in tribes or families by the alienation of houses. The seller also had a greater propriety in houses than in lands, as being commonly built by the owner's cost and diligence, and therefore had a fuller power to dispose of them. Besides, God would hereby encourage persons to buy and possess houses in such places, as frequency and fulness of inhabitants in cities, was a great strength, honour and advantage to the whole land.