To expand on the idea above we want to emphasize the idea of different and distinct stores.
Here are a couple links. Please do not copy these but use them for inspiration, as to what we are looking for when we say roof line and store fronts.
http://www.istockphoto.com/stock-illustration-17866408-shopping-people.php?st=dffb086http://www.istockphoto.com/stock-photo-1789325-upscale-shopping-center.php?st=4c834beThanks