The first time I ever saw an urban cabin was in Seattle's Fremont neighborhood in December 2009. That was when I knew they existed.
Here is a photo from GSV:

This is how truly cabin-y it is. You can't even see it. But I remember peeking in through the little gate and it had a wide open porch and nice little yard. Like they woke up every morning in the woods, and then walked to work in the city. Brilliant.