We have a 5-story apartment building under construction. There is 1-level of noncombustible concrete with 4 stories of wood frame above. The floor between the ground floor and upper levels is 3-hour concrete. There is an exterior walkway along one side where the building above extends out over the walkway. The walkway is all non-combustible construction with a 3-hour rated assembly above. Does this walkway need to be sprinklered?