this is a quick blend I made its a destroyed building, idk if its good enough but I couldn't find any good destroyed buildings for free so I decided to make a quick one,u can use it for whatever thing u like.
Here's a tutorial for something very similar by Ian Hubert: https://www.youtube.com/watch?v=qNba2oEij2c Hope that's useful!
Very nice work! How you did those damages to building???