I'm sure that fire code is important, and that it saves many lives. But on behalf of everyone who uses public buildings: Come the hell on.
Based on what I've been told over the years, I'm pretty sure that according to full fire code, no space anywhere ever is allowed to have anything in it. Or anyone. The preferred fire marshal design seems to be a metal frame with no walls or ceiling.
And no one should enter these structures. Or get too close to a tree.
Because in the event of a fire, every person in a hallway is going to immediately freak out and start tackling anyone nearby.