1m50 it seems to me, that's enough, you gâcherais above your apartment, and must still have room. The installation goes here, helped by a diagram. Only complaint, he lost enormously hairs coating. Daily vacuuming is expected. Our cat to 4 months, the tree is starting to get wobbly, provide one or two 5kg cast iron discs for better stability. The manufacturer should address this problem. After 4 months, the cat will less and less in the hanging basket, the normal grown cat.