A feature that involves ownership, maintenance, and access issues between two property owners is called?

The feature that involves ownership, maintenance, and access issues between two property owners is termed a party wall easement. This type of easement pertains specifically to a shared wall or boundary structure between two adjacent properties. It typically outlines the rights and responsibilities of each property owner regarding the construction, maintenance, and repair of that wall or boundary, thus addressing potential disputes over usage.

In contrast, an easement in gross refers to a right granted to a person or entity to use another's land for a specific purpose but does not involve mutual interests between two property owners. Adverse possession is a legal doctrine that allows a person to claim ownership of land under certain conditions, often after occupying it for a specified period, but it does not involve the cooperative ownership and maintenance aspects of a party wall. A license agreement is a legal permission to do something on another's property that does not convey any ownership rights, distinguishing it from the shared responsibilities inherent in a party wall easement.