All owners and managers of property in Seattle should be advised that they must have a current registration with Seattle's Department of Construction and Inspection for their rental unit before they can file any eviction for the unit in question with the courts.
This registration requires all rental property to be inspected at least once every ten years, among other things. Please see 22.205.10 of the Seattle Municipal Code for details.
Links:
Register your rental property with Seattle's Department of Construction and Inspection
Rental Registration Instructions—Seattle Department of Construction and Inspections