In case there was any question, the PI’s Seattle 911 blog clarifies that it’s illegal to park a vehicle, either a car or a motorcycle over any portion of a sidewalk:
It’s illegal to be parked on any portion of the sidewalk, Seattle Department of Transportation spokesman Rick Sheridan said.
He cited section 11.72.360 of the Seattle Municipal Code, which states: “No person shall stop, stand or park a vehicle on or over a sidewalk, whether constructed or not.”
“constructed or not”, doesn’t seem to mean the unpaved sides of the streets in the city that are often used as parking spots for the homeowners, forcing pedestrians to choose between walking in the path of traffic or on a lawn to get around them. Certainly the parking enforcement folks never visit those parts of the city unless a car is clearly abandoned neighbors phone in a complaint.