What term refers to a wall shared by two separate properties?

The term that refers to a wall shared by two separate properties is known as a party wall. This term is commonly used in real estate to describe a wall that serves as a boundary dividing two adjacent properties, typically found in structures such as townhouses or duplexes. These walls can serve a specific legal purpose in defining ownership and responsibilities, particularly in contexts where adjoining property owners share the maintenance or could have overlapping use rights.

The term "common wall" may suggest a similar concept; however, it is less precise and often refers to a wall that is used by multiple units or tenants, rather than specifically indicating that two adjacent properties share the same wall for their own purposes. A "boundary wall" typically refers to a wall that marks the boundary between two pieces of land, without necessarily indicating shared ownership. Lastly, a "dividing wall" could imply any wall separating two spaces but does not carry the same legal connotations as a party wall, especially in terms of maintenance and rights. This makes "party wall" the most appropriate and specific term in this context.