Behind-Door Cat Tree Saves Space Cats are good pets to have in apartments and condos where space is at a premium, but you might not have room for big cat condos or climbing trees that sit on the floor. The SmartCat Multi-Level Cat Climber is an alternative option (by the way, if you have as many cats in your apartment as are shown in the picture below, space may not be your only issue!). The SmartCat Cat Climber is the perfect choice for small homes or f