This condo arrived completely put together. It is extremely sturdy and well constructed. My cat is older and this is her first big toy and after she realized it was for her, we couldn't keep her off even if we wanted to. She uses the sisal rope to sharpen her claws along with the carpeted area.  She is a bigger cat but she has no problem turning around on the lower levels or jumping to the top.  I would like to get her another.