Where a use exists on the date that this title becomes effective and is permitted by this title only as a special use or exists as a previously approved planned unit development (PUD) in the district in which it is located, such use shall not be deemed a nonconforming use, but shall, without any further action, be deemed a lawful special use or PUD in such district. However, no such lawful special use or PUD shall be substantially expanded or altered unless a supplemental special use permit or planned unit development ordinance is secured according to chapter 13 (for special uses) or chapter 11 (PUDs) of this title. (Ord. 2002-01-15B, 1-15-2002)