Leviticus 25:29

29-31. if a man sell a dwelling house in a walled city, then he may redeem it within a whole year after it is sold--All sales of houses were subject to the same condition. But there was a difference between the houses of villages (which, being connected with agriculture, were treated as parts of the land) and houses possessed by trading people or foreigners in walled towns, which could only be redeemed within the year after the sale; if not then redeemed, these did not revert to the former owner at the Jubilee.

Robert Jamieson, A. R. Fausset & David Brown, 1871 · public domain

Verse 29 Sell a dwelling house in a walled city - A very proper difference is put between houses in a city and houses in the country. If a man sold his house in the city, he might redeem it any time in the course of a year; but if it were not redeemed within that time, it could no more be redeemed, nor did it go out even in the jubilee. It was not so with a house in the country; such a house might be redeemed during any part of the interim; and if not redeemed, must go out at the jubilee. The reason in both cases is sufficiently evident; the house in the city might be built for purposes of trade or traffic merely, the house in the country was built on or attached to the inheritance which God had divided to the respective families, and it was therefore absolutely necessary that the same law should apply to the house as to the inheritance. But the same necessity did not hold good with respect to the house in the city: and as we may presume the house in the city was merely for the purpose of trade, when a man bought such a house, and got his business established there, it would have been very inconvenient for him to have removed; but as it was possible that the former owner might have sold the house rashly, or through the pressure of some very urgent necessity, a year was allowed him, that during that time he might have leisure to reconsider his rash act, or so to get through his pressing necessity as to be able to get back his dwelling. This time was sufficiently long in either of the above cases; and as such occurrences might have been the cause of his selling his house, it was necessary that he might have the opportunity of redeeming his pledge. Again, as the purchaser, having bought the house merely for the purpose of trade, manufacture, etc., must have been at great pains and expense to fit the place for his work, and establish his business, in which himself, his children, and his children's children, were to labor and get their bread; hence it was necessary that he should have some certainty of permanent possession, without which, we may naturally conjecture, no such purchases ever would be made. This seems to be the simple reason of the law in both cases.

Adam Clarke, 1831 · public domain