As we are busy with a procedural-city-generator that we could use in future games, I created a small simple test building (prefab) to test the building-placement-code. This code is still pretty simple and only puts some buildings on a straight line along each street with a small offset. furthermore we added a sidewalk strip next to each street to give it a better look.
Here are the images created so far. Apart for some bugs it looks pretty neat.