1. A lawful or authorized nonconforming land use existing at the time of adoption of the Zoning Code may be continued, maintained, and repaired, except as otherwise provided in this section.
2. Any nonconforming land use in existence at the adoption hereof that was not a lawful or authorized use under previous zoning ordinances shall not be authorized to continue as a nonconforming use pursuant to the Zoning Code or amendments thereto.
3. Extension or Expansion of Use. A nonconforming land use may not be extended or expanded, nor shall it occupy more lot area or be considered a more intense use than was in existence on the effective date of the Zoning Code.
4. Discontinuance of Use. If said nonconforming use or any portion thereof is discontinued for a period of one year, or changed, any future use of such land, or change in use, shall be in conformity with the provisions of the district in which it is located.
5. Change of Uses. A nonconforming use of a conforming building or structure may be expanded or extended into any other portion of the structure provided the structure was manifestly arranged or designed for such use at the time of adoption or amendment of the Zoning Code, but no such use shall be extended to occupy any land outside such building. If the nonconforming use, or a portion thereof, is changed to a conforming use, any future use of such building, structure, or portion thereof shall be in conformity with the regulations of the district in which such building or structure is located. A vacant or partially vacant conforming building or structure may be occupied by a nonconforming use for which the building or structure was designed or intended if occupied within a period of one year after the effective date of the Zoning Code, but otherwise it shall be used in conformity with the regulations of the district in which it is located.
6. The use of a nonconforming building or structure may be changed to a use of the same or a more restricted district classification. However, where the use of nonconforming building or structure is changed to a use of a more restricted district classification, it shall not be changed thereafter to a use of a less restricted district classification unless appropriately rezoned. This is provided that the building or structure that is nonconforming at the time of adoption of the Zoning Code is not in violation. For the purpose of this subsection only, the R-l District shall be considered the most restrictive district and the M-2 District the least restrictive district.