Md. Code, Public Safety § 12–701

(a) (1) Except as provided in paragraph (2) of this subsection, each elevator and each stairway in a building with three or more levels or floors shall indicate clearly by sign or otherwise which levels or floors are most accessible to the exits of the building.

(2) This requirement does not apply to an elevator or stairway in a dwelling for the personal use of a family.

(b) The owner of a building subject to this section who violates this section is guilty of a misdemeanor and on conviction is subject to a fine not exceeding $50.