I'm pretty sure this is Georgetown Castle, reportedly haunted house in south Seattle. What few pictures can be found (plus one from the Bragg book) and descriptions describe it as a "turreted" old wooden house. Supposedly new owners in the 50s discovered it haunted by "Sarah", believed to be the spirit of a servant who was raped and whose subsequent baby was buried under the porch. Today it's an artists' commune.
Homes - Famous, Misc