If more than one door or entryway to any premises for which a number is required by the provisions of this chapter exists, such door or entryway shall be numbered by adding a proper fractional number to the number assigned for the premises, or, if more than one number has been assigned to the parcel of land upon which the premises are located, the next consecutive number so assigned shall be used.
(§ 8312.52, T.O.O.C.)