@Meier no it's all normal modeling, just made 36 buildings and the rest are just rotated and moved around versions of the same ones. I guess with nodes it would have been faster, but i cannot use geometry nodes at this time.
Basically is a more simplified version of this technique:
https://yewtu.be/watch?v=JjnyapZ_P-g
@Meier taking the example of the video, i didn't used only one photo, i used seven different ones precisely so it could look diverse enough.
Maybe I could just auto unwrap the sides and leave some fancy material in Unreal or something to do the heavy lifting on the windows.