In some areas, path marking for existing buildings is required. To know if this is required for structures near you, the requirements for such path markings are stated in the IFC; Section 4604.23 Egress Path Markings.
Minimum compliance requirements:
Existing buildings of Groups A, B, E, I, M and R-l 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 IBC; Section 1024 Luminous Egress Path Markings.
I get asked all the time by building managers if they need to install luminous egress pathway markings into their buildings. Thanks for the links!