All right, my web searching was more productive this time. I didn't find any specific room by room occupancy restriction in a fire code (which would be hard to write), but I did find a floor area to number of fire exits restriction. So there are only so many people allowed per fire exit. Maybe then it is the hotel's discretion to decide how to spread that occupancy number across the rooms so as not to exceed the numbers. I say this because sometimes large rooms have an occupancy of 2, and similar rooms 5, so it seemed a bit arbitrary.