and then they put the next one 4 ft. from those lovely windows so no light gets in anyway. At least for singles and duplexes, stay with the lot, gut the interior and get a standard 2 or 3 bed design with your open concept living area and do them all the same. They aren't intended for re-sale and they aren't permanent homes. With few exceptions I would guess that most change occupants every 5 years or less. The biggest danger to me is the contract will go to the absolute lowest bidder and they will use every shortcut they can to put as much money in their own pockets as possible.
Second solution, if the footings are solid, cut them off at ground level and design a pre=fab to replace it.