Existing buildings of Groups A, B, E, I, M and R-1 having occupied floors located more than 75 feet (22 860 mm) above the lowest level of fire department vehicle access shall be provided with luminous egress path markings in accordance with paragraph (X)(1024) of rule 1301:7-7-10 of the Administrative Code.
Exception: Open, unenclosed stairwells in historic buildings designated as historic under a state or local historic preservation program.