The arrangement of streets in new subdivisions shall make provision for the continuation of the existing streets in adjoining areas (or their proper projection where adjoining land is not subdivided) at the same or greater width (but in no case less than the required minimum width) unless variations are deemed necessary by the Planning Commission. The street arrangement must be such as to cause no unnecessary hardship to owners of adjoining property when they plat their own land and seek to provide for convenient access to it. Where, in the opinion of the Planning Commission it is desirable to provide for street access to adjoining property, proposed streets shall be extended by dedication to the boundary of such property. (PZSC § 03-28-005 (2) (J))