In a Class U1, U2 or U3 District, every dwelling or apartment house erected shall have access to a public street, and, if located in the rear of other buildings with no immediate street frontage, an easement for access shall be provided over an unoccupied strip of land at least twenty feet in width and such reserved strip may not form a part of any yard or lot areas required by this Planning and Zoning Code. (Ord. 121-1962. Passed 12-17-62.)