(A) It shall be the duty of the owner or manager of every multiple dwelling building, and the owner or occupant of every individually owned dwelling unit in any multiple unit building to properly identify each dwelling unit by attaching identification numbers on or adjacent to each entrance to the individual units. The owner or manager of any multiple dwelling building with common entrances, whether the units are rental or individually owned, shall provide signs easily identifying the location of each dwelling unit in the building. The signs shall be placed in an obvious location inside each entrance to the building.
(B) In case a primary structure is occupied by more than one business, each separate front entrance of such structure shall bear a separate number.
Penalty, see § 150.99