When Bassett was peeing out of behavioural problems the vet put her on an antidepressant. It stopped the problem COMPLETELY.. she was on it for less than three months. It's called Apo-Amitriptyline. Also, where is he peeing? Is it on a space that you occupy a lot? That would suggest that it is behavioural rather than health related. Another thing you can try is putting litter box over the spot that he peed in, or, if that isn't an appropriate space to pee, try putting some food there. It isn't likely he will pee where his food is. How many cats do you have? Next question, how many litter boxes? You might want to try having one more litter box than the number of cats you have. What I mean is if you have one cat, try two boxes, two cats, three boxes, three cats, four boxes etc etc.

I am not understanding what you mean when you say you trained him to pee in a closet?? If you have trained him it's ok to pee outside a litterbox in one place he may think he can go anywhere. I would definatly encourage him to use the litter exclusively.

As for the smell, well.. cat urine is the most disgusting pet odour I have ever come across. It needs to be cleaned several times before the smell isn't noticable to them, and if he smells his "spot" he will use it again. You might want to try squirting that area with citris (cat's usually hate that) or vinegar.

You said he was 8 months old - is he neutered? That may help as well.

Good luck! I hope my rambling offers some good advice! Please keep us posted!