Leviticus 25:29

A dwelling house in a walled city. — It is, however, quite different in the case of houses in walled cities. These are not the creation of God (see Leviticus 25:23), allotted by His command to the different tribes of Israel; they are the work of man, who build them up and raze them to the ground at their own will, and according to their fancy. Hence the law of jubile does not apply to these temporary human buildings. Though an Israelite could sell his house without being driven by stress of circumstances to do it, still, as he may feel attached to his home, the Divine law affords him some protection for a limited period, during which he or his family may redeem the building. During the second Temple “a dwelling house in a walled city” was defined to be a house standing within an area of land which was first walled round for the purpose of building upon it human habitations, and in which the houses were afterwards erected. But if the houses were built first, and the city wall afterwards, they do not come within the law here laid down.

Within a full year may he redeem it. — If within a year of the sale he wishes to redeem, the Law gives him the power, or in case he dies empowers his son, to repurchase the property at the same price which he received for it. Besides limiting the period to a year, the Law does not prescribe that the next of kin is to redeem, nor give him the power to do it. During the second Temple it was also enacted that the vendor could not redeem it with borrowed money.