The housing market is so bad in a lot of places, people are trying to turn every garage, basement, and garden shed into a separate dwelling to rent out or sell for some extra cash.
Floor 2 is a fucking mystery. Its too low to walk around the perimeter, but they didn't install a floor in the middle. There's not enough room for insulation between the sun-beaten roof and the living space, but that might be less of an issue because of the huge holes in the trim letting in a steady flow of outside air. That vaulted ceiling also means the house will lose all its heat in the Winter.
There's no window or exhaust fan in the bathroom.
It looks like there are holes in the outside wall where windows could be installed, but there are metal flaps there instead. Best case scenario is there is no wall insulation between those flaps and the interior drywall, getting wet and doing biology.
DIY masters. Reminds me of a house i looked at years ago, the owner had built an entire glaziers workshop attached to the back of the house, with no planning or permits - i did not make an offer