this cat tree has a condo, for cats to sleep. The space inside is quite big. and has two scratching posts. With natural sisal covered, it has no harm to your flurry friends. And on the top, there is a flat platform for cats to watch, take a cat nap,or even to play there. Together with the cat tree, there is a hanging ball. It is designed for cats to have fun. We use 300g/㎡ flush to cover the surface. While cats scratch or play or lay down on it, they have the very comfortable place to stay. Due to the design, this model has huge space for cats to stay. The condo can be flat packed. When you have it, it is quite easy to install. One person is enough to complete it in 5 minutes.