Final answer:
Another name for a legal non-conforming use is a 'grandfathered use.' This term refers to property uses that predate current zoning laws and are allowed to continue despite not being in compliance with current regulations.
Step-by-step explanation:
The term you are looking for is grandfathered use. This refers to a situation where a property's use predates and does not comply with current zoning regulations but is allowed to continue as it is because it was established before those regulations were enacted.
Grandfathered uses are often recognized in zoning ordinances and real estate law and are treated as exceptions to the rules that would otherwise prohibit such use.
These situations arise when zoning laws change, and existing structures or uses do not meet the new requirements. Instead of forcing property owners to cease the non-conforming use, which can be unfair or impractical, the law allows those uses to be grandfathered in.
However, there are usually strict rules regarding the extension, expansion, or abandonment of these grandfathered uses.