He has at least two actually. I've seen them both upclose ;)
The Tatoosh is the 9th largest privately owned boat/ship in the world at 301'8". It can carry 2 helicopters, a 40' speedboat, and a sailboat and has a good size pool onboard. Cost him around $100mil. It was owned for less than a year by Keith McCaw (McCaw Cellular..another big NW name).
The second is the Meduse. It's just under 199'.
He used to own a 153' yacht named the Charade but gave it to his sister.