The lawful use of land or buildings existing on January 16, 1974, may continue, although the use does not conform to the regulations specified by the Zoning Ordinance for the district in which the land or building is located, subject to the following conditions and specifications.
(a) Any nonconforming use of land or building which has ceased by discontinuance or abandonment for a period of ninety days shall thereafter conform to the provisions of the Zoning Ordinance and every ordinance passed subsequent to May 28, 1956.
(b) Any nonconforming building which has been destroyed or damaged to the extent of sixty percent (60%) or more of its assessed valuation, shall thereafter conform to the provisions of this chapter and every ordinance passed subsequent to May 28, 1956. Where more than forty percent (40%) of the assessed value of the building remains after such damage, such structure may be restored to the nonconforming use as existed before such damage.
(c) No nonconforming use of a building may be moved to any other part or parcel of land upon which same was conducted as of January 16, 1974
(d) No nonconforming building shall be enlarged or altered except to make it a conforming building. A nonconforming use of a building existing at the time of January 16, 1974, may be extended throughout the building provided no structural alterations, except those required by ordinance or law, are made therein, and provided approval is granted by Council.
(e) The use of a nonconforming building may be changed only to a use of like or similar character, or to a conforming use.
(1973 Code §151.16)