Have already recommended Wayfair's wonderful selection of cat trees, provided photos of our cat tree with cats (2) getting settled in and choosing their preferences of the various shelves and condos  So far, two friends expect to purchase one.  The prices are amazing and the quality of the tree I purchased is wonderful.  I built a cat tree several years ago and it cost more and was not of the same high quality as the offerings on the Wayfair web site.  My purchase was of a 6' 8" tree, which gives our kitties a commanding view of their domain.  I could not have been more pleased.  The was delivered quickly and assembly was easy; it took about 30 minutes to sort parts and assemble.