A municipality adopts a zoning ordinance that restricts a neighborhood to single-family residences only. A person owns a two-family house in the same neighborhood at the time the ordinance is adopted. Which of the following must this owner do?

An appeal for a variance would be unnecessary since the property was legally established prior to the zoning ordinance. A variance is typically sought by property owners who wish to deviate from the current zoning regulations, but this owner is not required to change their existing use.

Converting the two-family house into a single-family residence is not mandatory under the new ordinance. The owner can continue using the property as it is, as it is a legal nonconforming use that is allowed to exist despite the new zoning restrictions.

Applying for an exercise of eminent domain is irrelevant in this context. Eminent domain refers to the government's right to take private property for public use, usually with compensation. This scenario does not involve any governmental taking of the property; the owner simply retains their rights to the existing structure.