Other provisions of this chapter notwithstanding, nothing shall prohibit the use of a lot of less than the required area and width for a single-family dwelling in any district, except a lot in an Industrial or a NYS Flowage Easement District, provided that all the other provisions of this chapter are complied with when such lot, at the time of the enactment of the Zoning Code of the Town of Lysander was owned or under contract of sale by persons other than those owning or leasing any adjoining lot.