The continuance of nonconforming uses or structures shall be subject to the following limitations:

1.   Continuation. Any lawful use of a building or land existing at the effective date of the Zoning Ordinance may be continued, although such use does not conform to the provisions of such ordinance.

2.   Extension. A nonconforming use shall be allowed one 25 percent expansion of the building. Said expansion shall not exceed 25 percent of the floor area. The extension of a conforming use to any portion of a nonconforming building which existed prior to the effective date of the Zoning Ordinance shall not be deemed the extension of a nonconforming use.

3.   Restoration. No building damaged by fire or other cause to the extent of more than 50 percent of its value shall be repaired or rebuilt, except in conformity with the regulations of this chapter.

4.   Abandonment. Whenever a nonconforming use has been discontinued for a period of one year, such use shall not thereafter be reestablished and any subsequent use shall be in conformity with the provisions of this chapter.

5.   Substitution of Nonconforming Uses. No nonconforming use may be changed to any other nonconforming use, unless the Board of Adjustment finds that the proposed nonconforming use is no more detrimental to the district than the existing nonconforming use of the property. The Board of Adjustment may specify such appropriate conditions and safeguards as may be required in connection with such change.

6.   Repairs and Maintenance. Ordinary repairs and maintenance of a structure containing a nonconforming use shall be permitted.

7.   Change in Use. A nonconforming use shall not be changed except to a conforming or to another use of a higher or more restrictive classification as provided in this chapter. A change of a nonconforming use in an Industrial District to a use which is residential shall not be permitted.

8.   Amortization of Nonconforming Signs. Signs and billboards which exist off the site of principal use on the date of the adoption of the Zoning Ordinance and which are nonconforming in accordance with the ordinance shall be made to conform within a period of three years from said date.

9.   Amortization of Nonconforming Use of Open Land. All nonconforming junk yards, storage areas and similar nonconforming uses of open land not involving a substantial investment in permanent buildings shall be torn down, altered or otherwise made to conform within three years from the date of the adoption of the Zoning Ordinance.