It's an all too common situation. You find a perfect home for sale in an ideal neighborhood. It's been beautifully remodeled, and it has everything you've been searching for. Even the price is right. Something tells you it might be too good to be true, but you put in an offer anyway, and it's accepted. You start doing all the paperwork, and sure enough you discover the catch that you always somehow suspected was there.
The sellers did all of that remodeling work without any building permits.