We have a mixed use tower with 34 levels of office with 18 levels of residential ontop. We require firemans elevators which are required to have a lobby and a connection to a stair. These elevators serve the residential portion of the tower, but in case of fire will be able to stop on all levels, including the office levels. We are considering these elevators, the lobby and connection to the fire stair as a mixed use common area. Would you agree with this interpreation?