^Isn't that the truth?
Hubby has locked Junior out of his office since we got him in October. One day last week, he forgot and left the door ajar while we went out for a few hours. Hubby also had his space heater on, so space heater + cat pee = entire house smelled. Never could find the exact spot where he peed, either, so everything got cleaned, sprayed, aired out, etc.
I think Hubby just lost the battle for territory in our house.