It depends on the building use. In residential buildings, people do tend to go to / from ground but in my building the parking garage has entrances on levels 1

It depends on the building use. In residential buildings, people do tend to go to / from ground but in my building the parking garage has entrances on levels 1-4, the gym on 3-4 and the garden on 5. That distorts the traffic pattern. The company where I work occupies an entire office building, so there is lots of travel between floors.