I don't think his home address is on this site (although it floats around the internet), and I don't recommend going there. He's a nice guy, as Hollywood bigshots go, but nobody likes a home invader.
I've read that he will supposedly be doing some book readings to publicize his upcoming autobiography. That seems the perfect occasion -- watch the papers closely.
Other fans have met him in or near a theatre when he's making one of his periodic forays onto the stage.
He does have an office at Universal, and you might catch him there is he's not filming somewhere. At least, when you're at Universal, you hopefully can see the Columbo car!