As someone told me this is not a cat tree - its a cat village!, and she is right.  Its big and massively sturdy.   I have 4 rambunctious cats and even with all four of them racing up and down this thing does not move!  Though I had a few swear induced moments putting it together it is possible to do so with one person.  And Im a 57 yo woman.  I did need help moving it though, once put together, just for the sheer size and weight.  Cats absolutely love it! Money very well spent!