Exteriorexitstairways shall not be used as an element of a required means of egress for Group I-2 occupancies. For occupancies in other than Group I-2, exteriorexitramps and stairways shall be permitted as an element of a required means of egress for buildings not exceeding six stories above grade plane or having occupied floors more than 75 feet (22 860 mm) above the lowest level of fire department vehicle access.
780 CMR, 1026.2