The condo cover on this 56-in cat tree comes off, turning a closed den into an open platform when a cat stops wanting walls or the room warms up. Inside, the condo is lined with bamboo, while its outer face is a sisal mat, so the box a cat sleeps in doubles as a surface it can claw. Above it sits a 20 by 17.5-in perch with 4-in of padding, wide enough for a large adult to sprawl rather than perch. A 2-in-1 ladder and three platforms break up the climb, the frame is solid birch plywood, and each layer carries 33 lbs.