First mistake there. Never stay or eat in Seattle. It's liberalville, they'll soak you for everything.
I'm only a few miles away but it takes a special event to drag me down into Seattle proper.
And when I have to go I take the bus (from the Eastside). Usually cheaper than parking though it takes longer -- and I don't have to deal with the traffic.
I am booked in the Westin in Sept. $82 plus $18.51 tax.