A more thorough explanation:

PARIES COMMUNIS

A common wall; a party wall.

Paries communis is a Latin term that refers to a wall that is shared by two or more buildings. It is also known as a party wall. This type of wall is usually found in urban areas where buildings are constructed close to each other. The wall is owned jointly by the owners of the buildings on either side of it.

For example, if two houses are built next to each other and share a wall, that wall is a paries communis. Another example is a wall that separates two units in a condominium or apartment building. The wall is considered a paries communis because it is owned by both unit owners.

Paries communis is important because it defines the rights and responsibilities of the owners of the buildings that share the wall. For instance, if one owner wants to make changes to the wall, they must get the consent of the other owner. Additionally, both owners are responsible for maintaining the wall and ensuring that it is in good condition.