No building permit shall be issued for any lot or parcel of land unless the lot has frontage on a dedicated and improved street. The Commission may approve access from a private street, provided the street conforms to the standards of the city. A lot shall be deemed to have frontage on a street where not less than 30 feet of the lot abuts a street and when vehicular access to the lot is by way of the frontage.
(`78 Code, § 17.06.140.)