A party wall is a wall that is commonly owned and shared by adjoining owners along their common property line and that forms a part of the dwelling owned by each one. Party walls are not mentioned in the Davis-Stirling Act or otherwise governed by statute. However, in most planned developments governing documents where there are party walls, there are frequently party wall agreements binding the owners that regulate what can or cannot be done with the wall, duties to repair them when damaged, etc. In contrast, a division fence or wall that straddles a boundary between two lots is governed by Civil Code section 841. The statute requires the two owners to share the maintenance costs equally subject to the exception in the statute.