Are you looking for a cat tree: https://www.hometalk.com/33649589/diy-cat-trees?expand_all_questions=1?
Just saw this cat tree on Pinterest made from old repurposed drawers. This is such a great idea for the cats to climb and sleep in and it won't cost a fortune! https://www.pinterest.com/pin/743868063430380773/
Stock boxes or use paint stir sticks to build something like that https://www.pinterest.com/pin/807903620630422658/
An old printer table made my cat his "condo" Bottom shelf holds
litter box..easy access to clean
Top shelf has basket with a fuzzy
blanket he cuddled on..you can get place and stick tiles to do over
any wood areas