The base is a litter box enclosure measuring 26 x 21.5 x 18 in, which hides the tray behind a door and puts the climbing structure on top of space that was already being used - the single most efficient arrangement in a small apartment. Above it sit a 19 x 10 x 10 in condo, an 18.5 x 8 in scratching board and a 12.5 in top perch. Overall dimensions are 37.5 x 22 x 52 in with 44 lbs of capacity, and at 66 lbs this is the heaviest piece here, which is what keeps a cabinet-and-tower combination from rocking. MDF with plush and sisal.