Due to a complaint, I performed an inspection in an existing restaurant. The new tenant had cut an opening into the kitchen which required a step down from the hallway. Besides the obvious, it is not accessible I seem to remember that a previous code noted that you could not have a single step in a path of travel. It would have to be ramped. I cannot find this section in the new code. The reason I remember it so well was due to a law suit over a single step in a restaurant.