I saw something online about people building houses in unusual spaces. Sometimes this was because that was all the space that they had available. Other times they did it to spite someone who had the adjacent property. One of them turned out to be in Seattle so I decided to check it out when we were over there running some other errands. It is located in Montlake.
The house is a wedge shape. If you look at it from the main road, it looks like a relatively normal frontage. Nothing too special. From the wide end, it seems like a single room width property. There is a garage underneath and rooms above. Go to the other end, though, and you see just how much it narrows down. There is space for a door and that is about it. A trip to Google Maps will show you the footprint of the house and you can see how it has been squeezed in. A weird place for sure but apparently a popular house to own judging by the price it has sold for in the past!