The Sisal Spire is prime real estate for your cat or family of cats! Measuring 63 inches tall, the bottom of this unit is a 2-floor enclosed house area. To allow easy movement between the two floors in the enclosed house, the shelf has a 15"x8" opening in the back for climbing back and forth between floors. This sisal post has two observation decks are provided, the first level being almost a half-circle and the top level being a little smaller and tiered to allow easy access. These are flat, non-lipped platforms. The standard model comes with tall sisal scratching poles on each side of the enclosed house (as pictured). Vital Stats: House: 16" wide x 20" deep Inside floor 15"x11"x24" high Base: 22"x22" Roof: 20"x20" Mid Platform 17"x15" Top Platform 15"x12" (2) 24" sisal scratchers on house standard Overall height 63"