Structures and/or accessory development, which by reason of size, type, location on the lot, or otherwise in conflict with regulations of the zoning district in which they are located may be altered, reconstructed or extended on appeal to the Planning and Zoning Commission, provided the applicant shows that:
(a) The nonconforming structure and development was lawful at the time of enactment of this Zoning Code.
(b) Such alteration, reconstruction or extension is necessary and incidental to such existing lawful nonconforming use as demonstrated by the applicant.
(c) Such extension shall not increase the total floor area by more than fifty (50) percent.
(d) No extension shall be requested within two (2) years of the last previous extension as approved by the Planning and Zoning Commission.