When you are short on horizontal wall, the deluxe fort goes vertical. Your cat enters up the ramp at the bottom, climbs through the escape hatch in the middle, or drops in from above by way of the hammocks. It stacks a lot of activity into a small footprint. Add the scratching pole and you fold healthy climbing and clawing into the same structure.It fits a home of one to three cats and is a smart pick where territory is a concern, since a leaf shelf on the pole adds extra pathways and perches so no cat gets cornered. It comes in versions for 16 and 24 inch stud spacing.