John Calvin Commentary Leviticus 25:29

"And if a man sell a dwelling-house in a walled city, then he may redeem it within a whole year after it is sold; for a full year shall he have the right of redemption." — Leviticus 25:29 (ASV)

And if a man sell a dwelling-house. Here, he distinguishes houses from lands, providing that the power of redemption would not extend beyond a year, and also that the purchase would hold good even in the Jubilee.

A second distinction, however, is also added between different kinds of houses: namely, that houses in towns could be altogether alienated, while the condition of those in the country was to be the same as that of the lands themselves, since they were annexed to the lands and thus considered part of them.

Regarding houses in towns, because they were sometimes burdensome to their owners, it was an advantage that they could pass into the hands of the rich, who were able to bear the building expenses.

Besides, a house does not supply daily food like a field, and it is more tolerable to be without a house than a field, where you can work and from whose cultivation you can support yourself and your family.

But it was necessary to make an exception for houses in the country, because they were appendages to the land. For what use would there be in harvesting the fruits if you had no place to store them? Indeed, what good would it be to possess a farm that you could not cultivate? For how could oxen plow without any stalls in its vicinity?

Therefore, since lands without farm buildings or cottages are almost useless and cannot be conveniently separated, God justly appointed that in the year of Jubilee, every rural possession would revert to its former owner.