My poor city totally ruined… 
( seen from unity3D, i did not reintegrate all elements in a .blend yet )
Now it’s time to take 1850-1860 photos and remake it as it was in these times 
Lots of hours of modeling ( and texture creation, and occlusion/dirt calculations and… ) in sight
Event the ground map has to be reworked 
See you soon and happy blending !