Any lot existing and of record on the effective date of this chapter may be used for any principal use permitted in the district in which such lot is located, other than conditional uses for which special lot area requirements are specified in this chapter, whether or not such lot complies with the lot area requirements, or requirements of this chapter. Such use may be made, provided that all requirements other than lot area requirements prescribed in this chapter are complied with, and provided that not more than one dwelling unit shall occupy any lot except in conformance with the provisions of this chapter for required lot area for each dwelling unit, and except as provided for in Article XVIII, § 370-62, in this chapter.