There are typically two short sets of stairs, one running upward to a bedroom level, and one going downward toward a basement area.
[1] The advantage of sidesplits (and its closely related backsplit) is that it separates bedrooms from living space without the need for a full flight of stairs.
The front entry is larger with room for groups of people to enter and a closet.
The front door opens directly into what is usually the formal living area, which is typically partially above ground level.
The lower level is a finished area partially underground (approximately three feet below grade) and must have an outside entry door.