31.09.010

An ordinance enacted under this title may not prohibit the continuation of the lawful use of any building or premises for any trade or industry for which such building or premises is used at the time that the ordinances take effect, but the alteration of, or addition to, or repair in excess of 50% of its assessed value of any existing building or structure for the purpose of carrying on any prohibited trade or new industry within the district where such buildings or structures are located, may be prohibited. The continuance of the nonconforming use of a temporary structure may be prohibited. If the nonconforming use is discontinued for a period of 12 months, any future use of the building and premises shall conform to the ordinance.