Except as permitted in Section 165.19 of this chapter, no lot shall contain any building used in whole or in part for single-family or two-family residence purposes unless such lot abuts for at least 40 feet on at least one public street. An exclusive unobstructed ingress/egress easement of access or right-of-way of at least 24 feet wide to a public street may be used to satisfy this requirement in unique circumstances as approved by the Council upon recommendation of the Commission.