No dwelling or apartment house shall be erected, altered or used unless the same shall have access to a public street. If located in the rear of another building with no immediate street frontage, then a permanent easement for access shall be provided over an unoccupied strip of land at least twenty feet in width. Such reserved strip of land may not form a part of any lot width, lot yard or lot area required by the Zoning Ordinance. If more than one dwelling is located in the rear of another building with no immediate public street frontage, then such easement for access shall be not less than forty feet in width and each additional rear house shall be subject to the same requirements for frontage on the easement for access and other requirements for lot and yard areas as though such dwellings were located on a public street. The easement shall be executed with the requirement provided by law for deeds and shall be filed with the Lake County Recorder for Record.