my cat has this... the legs of the tree are wrapped in twine/rope which he uses alot scratching..
http://www.allpetfurniture.com/Armar...1-ATM1010.html
i also have a few smaller cat posts that he scratches. he did used to scratch one chair pretty bad, but i just accepted it and let it be. i ended up selling the chair anyway, cat scratches and all
i declawed my first cat... not knowing what it was about and i was much younger and uneducated. when i adopted this cat 5yrs ago at 1.5yrs old, there was no way i was going to do that to him. he is a fine cat still, scratches things here and there but not too bad... but then again, i've got the huge tree and a few other posts to keep him busy.
good luck... sometimes it's just a matter of finding the right cat furniture for him to use, in addition to accepting that he's a cat... and you might lose some furniture by having him...