The Seattle Police Department suggests:
Keep thieves out of secure parking garages by ensuring doors fully close behind you.
• Remove or hide anything that a car prowler might mistake as something worth stealing.
• If valuables must be left behind, hide them out of sight several blocks away before parking.
• Remote controls for garages should never be left inside parked vehicles.
• If you park on the street, choose a well-lit, open space.
More Seatttle Police Tips and where to report (HERE).