(a) Any lawful use of a building existing at the effective date of this Zoning Code may be continued, even though the use does not conform to the provisions hereof, but no building shall be enlarged or extended. If no structural alterations are made, a nonconforming use of the 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 are more manifestly arranged or designed for such use at the time of adoption of this Zoning Code.
(b) Whenever the use of a building shall become nonconforming through a change in the zoning regulations or in the district boundaries, such use may be continued and, if no structural alterations are made, may be changed to another nonconforming use of the same or of a more restricted classification.
(c) Whenever a nonconforming use of a building or portion thereof is discontinued for a continuous period of one year, such nonconforming use shall be deemed to be abandoned, and any future use of such building or portion thereof shall be in conformity with the regulations of the district in which such building is located.
(d) A nonconforming building which has been damaged by fire, explosion, act of God or the public enemy to the extent of more than seventy-five percent (75%) of its reproduction value at the time of damage shall not be restored, except in conformity with the regulations of the district in which it is located. When damaged by less than seventy-five percent (75%) of its reproduction value a nonconforming building may be repaired or reconstructed and used as before the time of damage, provided such repairs or reconstruction are completed within one year from the date of the damage.
(e) A nonconforming use in violation of the provisions of the previous Zoning Ordinance which this Zoning Code replaces shall not be validated by the adoption of this Zoning Code.
(f) Any nonconforming structure that is ready for or is under construction when this Zoning Code is adopted or amended may be completed and occupied in accordance with the requirements of the valid building permit that was previously issued therefor.
(g) A nonconforming front porch may be enclosed. When such porch is nearer to the street than the building or porch located on either side, the porch enclosure shall be considered temporary. Temporary porches shall not be enclosed with siding or other material except glass, windows and screening, and framing above the existing height of railing.
(1980 Code 153.146)