A.ย 
Any lawful use of a building existing at the effective date of this chapter (9-27-1965) may be continued, even though such use does not conform to the provisions hereof. A nonconforming use of a building may be changed to another nonconforming use of the same or of a more restricted classification. Whenever a nonconforming use has been changed to a more restricted use or to a conforming use, such use shall not thereafter be changed to a less restricted use. The nonconforming use of a building may be extended throughout those parts thereof which were manifestly arranged or designed for such use at the time of adoption of this chapter.
B.ย 
Whenever the use of a building shall become nonconforming through a change in the zoning ordinance or in the district boundaries, such use may be continued and may be changed to another nonconforming use of the same or of a more restricted classification.
C.ย 
Whenever a nonconforming use of a building or portion thereof is discontinued for a continuous period of two years, any future use of such building or portion thereof shall be in conformity with the regulations of the district in which the building is located.
A nonconforming use of land existing at the effective date of this chapter (9-27-1965) may be continued; provided, however, that no such nonconforming use of land shall be in any way expanded or extended, either on the same or adjoining property. If such nonconforming use of land or any portion thereof is discontinued for a continuous period of one year or changed, any future use of such land shall be in conformity with the provisions of this chapter.
The nonconforming use of land for storage purposes and for advertising signs and billboards located within any R District shall be discontinued within five years from the date of approval of this chapter and any such uses of land which become nonconforming by reason of a subsequent change in this chapter shall also be discontinued with five years from the date of the change.