abutter
n. C1 Advanced abut·ter
n. a person or thing that is next to another on a map or in a building. You use this when talking about land or walls that share a side.
n. a person or thing that is adjacent to another on a map or in a physical structure. Often used in legal or architectural contexts to describe shared boundaries.
The two houses are abutters on the same street.
The property owner must consult with his abutter before building a fence along the shared boundary.
In the architectural plan, the abutter is defined as the adjacent structure whose proximity necessitates specific fire safety measures and shared drainage solutions.
From abut + -er.