Here is a huge cat tree designed to accommodate multiple cats easily. The Go Pet Club 87.5″ Cat Tree Condo is covered with faux fur and natural sisal rope. It has 3 large cat houses in addition to 2 smaller ones. Your cats also get 2 top perches and tunnels.
This large cat tree measures 42″L x 23.5″W x 87.5″H. Costs under $185 at this time.