Any lot proposed for residential use shown on a subdivision plat which has received preliminary approval by the Planning Board in accordance with Chapter
169, Subdivision of Land, of the Code of the Town of Marbletown, and Article 16 of the Town Law of the State of New York prior to the effective date of this chapter, and which approval is still valid on the effective date of this chapter, and whose area, and/or width, and/or depth are less than the minimum lot requirements of this chapter, shall be considered in compliance with such minimum lot requirements of the district in which it is located; provided, however, that final approval of such subdivision plat shall be obtained and the subdivision plat filed in the office of the County Clerk in accordance with Chapter
169, Subdivision of Land, of the Code of the Town of Marbletown and Article 16 of the Town Law of the State of New York within one year of the effective date of this chapter. In the event that final approval and filing of such subdivision plat is not obtained within 12 months of the effective date of this chapter, this exemption from the minimum lot requirements of this chapter shall not apply.