A house in a village without walls was treated the same as land. The family could buy it back. If they did not, it returned to the seller’s family in the Year of Jubilee.
But a house inside a walled town was different. No farmland or pasture was included in the sale of such a house. A house could even be built on the town wall without touching the ground (Josh 2:15). For this reason, the land was not part of the property.
Such a house could not be bought back unless the new owner chose to sell it. It also did not return to the original family in the Year of Jubilee.