What are "Batei ha'Chatzerim"?
Rashi: They are houses in open towns without walls. 1
What are the ramifications of "Ge'ulah Tih'yeh Lo"?
Rashi: It means that the seller may redeem the house immediately 1 if he so wishes.
Rashi: As opposed to a field, which he cannot redeem before two years.
Why do Batei ha'Chatzerim revert to the seller in the Yovel, even though houses is a walled town do not?
Ramban (29), Moshav Zekenim (29): Batei ha'Chatzerim are for people who work the fields. Consequently, they have the same law.
What are the implications of "uva'Yovel Yeitzei"?
Rashi: It implies that the house reverts immediately to the seller, without him having to compensate the purchaser. 1
Sifsei Chachamim (from Erchin 29b): This does not apply to a field sold a year before Yovel. Since a field is always sold for at least two years, the buyer gets another year after Yovel.