The use of a vacant lot which does not conform to this Code may continue so long as its use remains otherwise lawful, subject to the following provisions:
(a) Expansion of Use: The nonconforming use of a lot, or part thereof, shall not be expanded or extended onto other parts of the lot.
(b) Discontinuance of Use: If the nonconforming use of a lot, or part thereof, is discontinued for a continuous period of one year, any future use of such lot, or part thereof, shall conform to the use regulations of the district in which it is located.
(c) Insufficient Size: A lot of record, located in a residential district, nonconforming due to the enactment of a zoning ordinance or amendment to a zoning ordinance, shall be permitted to develop in accordance with the zoning regulations in effect just prior to the amendment which changes said lot into a nonconforming lot, to the extent that the size or shape of said lot prevents development of the lot in accordance with the lot area, width, density, front yard, side yard, rear yard, or maximum height regulations in effect at the time development is proposed. To the extent said lot can be developed in accordance with existing zoning regulations, the present regulations shall prevail over prior enactments. The Zoning Inspector is hereby authorized to issue a zoning permit and the Planning Commission is hereby authorized to grant developmental approval upon appropriate proof of the inability of a lot to comply with present regulations and the date said lot was recorded. Any lot of record existing prior to the enactment of any zoning ordinance within the Village of South Russell or prior to the amendment which changes said lot into a nonconforming lot, and where such compliance with this section is not possible, such development of the lot shall not be allowed by the Zoning Inspector and the applicant must seek a variance from the Zoning Board of Appeals. In the event, however, said lot can be developed to comply with present regulations, said applicant shall conform where possible to present regulations.