When at the effective date of this title or amendment thereto, there exists a lawful use of a building, or use of a principal building and land, or use of land and accessory structures, such structures covering more than ten percent (10%) of the lot area, and such use would not be permitted by the terms of this title or amendment thereto, such use shall be deemed nonconforming and may continue subject to the following provisions:
A. Enlarging Or Extending: No building devoted to a nonconforming use shall be enlarged or extended, except in changing the use of the building to a use permitted in the district in which it is located.
B. Portion Of Building: A nonconforming use of a portion of a building may be extended to the remaining portions of the building if such portions were manifestly arranged and designed for such use, but such use shall not be extended to occupy any land outside the building.
C. Nonconforming Use Superseded By Permitted Use: A nonconforming use of a building or building and land in combination, if superseded by a permitted use, shall not thereafter be resumed.
D. Discontinuance: A nonconforming use of a building, or building and land in combination, if discontinued for twenty four (24) consecutive months or for twenty four (24) months during any three (3) year period (except when governmental action impedes access to or the use of the premises), shall not thereafter be resumed.
E. Termination Of Use Of Building: Where nonconforming use status applies to a building and land in combination, termination of the use of the building within the meaning of subsection D of this section shall eliminate the nonconforming status of the use of the land.
F. Changing Of Use; Special Exception: A nonconforming use of a building or of a building and land in combination when located within a residential district shall not be changed unless changed to a use permitted in the district in which located. A nonconforming use of a building or of a building and land in combination, when located within a district other than a residential district, may, as a special exception, be changed upon approval of the board of adjustment after a finding that the proposed use will not result in any increase of incompatibility with the present and future use of proximate properties. The change of a use to another use contained within the same use unit shall not constitute a "change of use" within the meaning of this section.
G. Damaged Structure: Should the structure containing a nonconforming use be damaged or partially destroyed to the extent of more than fifty percent (50%) but less than seventy five percent (75%) of its current replacement cost at the time of damage, the restoration of the structure shall be subject to the board of adjustment's findings, after adherence to the procedural requirements for a special exception, that the contemplated restoration is necessary for the continuance of the nonconforming use, and will not result in any increase of incompatibility with the present and future use of proximate properties. Should the structure containing a nonconforming use be damaged or destroyed to the extent of more than seventy five percent (75%) of its replacement cost at the time of damage, the nonconforming use shall not thereafter continue or be resumed. (1991 Code § 16-22-1220)