Halacha Overview - Neighbors

Note: It should be stressed that the statements in a summary must not be
interpreted as halachic rulings no matter how definitively they are worded.
When such rulings are needed a qualified rabbi must be consulted.

71. Neighbors - Shechenim

One partner can compel another to divide the partnership, or if this is
impractical, to buy him out or sell out to him. When dividing, a partner
who owns neighboring property can choose a share adjacent to his property.
If a person sells property or a share in a partnership his neighbors or
partners can compel the buyer to sell it back to them; but this does not
apply to rental or gift or exchange.a

Partners and neighbors can compel one another to share in necessary costs
and can prevent one another from creating nuisances. One who lives in a
city for a year or owns a home there must share in the upkeep of the
city.b

Sources:

a. 1:1-2; 2:9; 12:1,4-5,8; 13:1,4
b. 5:lff; 6:1,5