If the actual operation of a nonconforming use of a building ceases for a continuous period of twelve months, unless the legal owner can establish valid proof to the contrary, such cessation of nonconforming use shall be considered abandonment then without further action by the planning commission the building and the land on which the building is located shall be subject to all the regulations specified by Chapters 20.02- 20.60 for the district in which such land and building are located.
(Ord. 67-10 § 5.0204, 1967.)