24300 Woodinville-Snohomish Road:

I-405 North or South to exit 23 for Highway 522 East
1.7 miles on Highway 522, take the exit for NE 195th Street
Turn right at the end of the ramp, then immediately get into the left lane and turn left (north) at the light, onto Woodinville-Snohomish Road, aka Highway 9. If you cross some railroad tracks and start going up a long hill, you went too far and you need to turn around.
Go north on Highway 9 past the auto auction lot, then look for all the sleds and misc. boats on the left (west) side of the road (about 1/3 mile from the light). The showroom is at the north end of the lot, right next to a self-storage facility