So you are looking for a cat activity center that stands out? The Imperial Walker Cat Condo is worth a look. It is an enormous piece with a heavy base to stay put. It has an interior of 39″W x 16″H x 13″D, a large side opening, and everything your cats need to relax, jump, and play.
The Imperial Walker Cat Condo also has a top lounge area that measures 10″ x 14″. You can order it with sisal rope around the legs.