What are "Batei ha'Chatzerim"?
Rashi: They are open towns without walls. 1
What are the ramifications of "Ge'ulah Tih'yeh lo"
Rashi: It means that the owner 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 owner in the Yovel, even though houses is a walled town do not?
Rambam (on Pasuk 29): Because in open towns, the houses are built to guard the fields. Consequently, they share the equivalent Din.
And what are the implications of "u'va'Yovel Yeitzei"?