Nonconforming lots of record. In any district, permitted structures may be erected and/or enlarged on any single lot of record at the effective date of adoption or amendment of this chapter, notwithstanding limitations imposed by other provisions of this chapter. This provision shall apply even though such lot fails to meet the requirements for area or width, or both, that are generally applicable in the district, provided that yard dimensions and the requirements other than those applying to area or width, or both, shall conform to the regulations for the district in which such lot is located. Variance of yard or other requirements shall be obtained only through action of the Board of Zoning Appeals as provided by law.