(A)   Where, at the time of adoption or amendment of this code, lawful uses of buildings, structures, land, and premises exist which are included in the subdivision of uses for the district in which they are located but do not meet coverage, height, yards, parking, location of the lot, or other development requirements, such uses may be continued so long as they remain otherwise lawful, provided that:
      (1)   The lot on which such nonconforming development is located shall not be enlarged unless the additional development upon such land shall conform to the regulations for the district in which it is located.
      (2)   No nonconforming portion of a building or structure shall be reconstructed or structurally altered during any ten-year period to an extent exceeding in cost 50% of the value at which the building or structure stands on the tax duplicate, or in any one-year period to an extent exceeding 30% of such value, unless such reconstruction or alteration reduces the extent of the nonconforming development.
   (B)   These cost limitations may be appealed to the Board of Zoning Appeals under § 154.561.
('65 Code, § 1352.05)