Best tree for my apartment window

We live in a small apartment and needed something that wouldn’t tip over on our thick carpet. This wide-base design is fantastic. Our 15lb tabby usually makes trees sway, but this one stays put. The incline ramp is a nice touch for his afternoon naps in the condo. He spends most of his time in the metal-frame baskets though—I was worried they might bend, but they are very rigid. The 52.1 inch height is the sweet spot for looking out the balcony door.