Authority to Continue Any use, structure, lot, or site element that legally existed as a nonconformity as of the effective date of this ordinance, and any use, structure, lot, or site element that has been made nonconforming as of the effective date of this ordinance, and any subsequent amendments, may continue subject to the provisions of this chapter so long as it remains otherwise legal. A use, structure, lot, or site element that is illegal as of the effective date of this ordinance, remains illegal.