Top Pot Donuts
2758 Alki Ave SW, Seattle, WA
100% positive
Directions: The door to the bathroom is in the back of the store by the fireplace. Through that door make a right for restrooms. This is a single stall restroom. (a great alternative to the beach restrooms)
Comments: When I've used it I have been there for donuts too. I believe you could manage to use it without buying anything. Just walk straight to the back and go through the door. The staff are busy helping people.