What is land use that predates the current zoning ordinance and violates it called?

The term that describes land use that predates the current zoning ordinance and does not conform to the current regulations is known as "non-conforming use." This designation applies to properties that were legally established before the implementation of the updated zoning laws and have continued to operate in a manner that is inconsistent with the new zoning requirements.

Non-conforming use allows existing properties to remain in operation despite violations of current zoning rules because they were compliant at the time they were established. This principle is intended to protect property owners from losing their investments and the ability to continue their business operations.

While grandparented uses can be similar, the distinction lies in the terminology and the specifics of local ordinances. Amortization zones and zoning violations refer to different concepts. Amortization relates to the gradual phasing out of non-conforming uses over time, while a zoning violation typically indicates non-compliance without the historical context of being grandfathered in. Therefore, "non-conforming use" is the most accurate term for properties that were established under prior zoning regulations but now conflict with contemporary zoning laws.