Extra-large base: Featuring a cat-hole landing design, the 27.6-inch x 15.7-inch thickened base enhances the stability of the cat tree tower, preventing it from collapsing even when cats jump up and down, ensuring the safety of cats during use. Expandable and removable top perch: The top perch of this large cat tower measures 15.7 inches x 15.7 inches, allowing cats to enjoy the view or rest quietly. The removable mat makes cleaning easy, ensuring cats always have a clean and comfortable resting environment.