Current day modern hotels have the various machinery (heating, air conditioning, ventilation, fire suppression, server rooms, etc) in the top of the building, because if/when they explode, if they are in the basement, as traditional, the whole building might collapse, while the modern version, it'll only take off the roof (and some of these can be quite explosive). So if the hotel is taller on the outside than what you can account for on the inside, I think the various maintenance stuff is in there, it's just that Android is keeping an eye (and several cameras) on it, so we don't need to go there, ever.