There shall be posted adjacent to or near the directory as aforesaid
the name, address and telephone number of the owner of the premises
and the name, address and telephone number of the superintendent and
agent in charge of the premises and, where a resident on the premises,
the apartment number of the superintendent and agent.
There shall be affixed to the front entrance of each dwelling unit, plainly visible from the common hallway or areaway, the number or letter which corresponds to that set forth in the directory as required under §
156-88.