I still get confused and lost in the elevators around here. As you can see in this picture, there are NEGATIVE floors! At first sight you may guess that floor 0 is the ground floor and all the negative numbers indicate garage floors below. Not the case. In this elevator, floor -2 is the ground floor! The hard part about all of this is that the numbering is not consistent across all elevators. In my apartment building, floor 0 is the ground floor. At a restaurant I was at a couple weekends ago, floor -1 was the ground floor. I'm still trying to understand the logic behind this...