While looking for a link I seem to have lost, I ran across this tiny house in Toronto. Built in 1912 in a laneway, it's only 300 square feet. Based on the floor plan, I think it must be not much more than 6 feet wide, and therefore probably 40 to 45 feet long. Pretty cute, though!
It has its own website with a bunch of pictures here.
The floor plan doesn't show any side windows, but the pictures do show a window in both the kitchen and bathroom. Gotta love the Murphy bed!