Look at the design of the wall/building. Its actually two walls one old, one new. They rebuilt a crazy old building by adding a new exterior wall with supports etc etc... if there was water, even a tiny amount from the morning dew between the walls and the lighting struck that vaporizing it, that would create a low volume steam explosion. It was just enough pressure to pry the walls apart. The exterior wall lost because it had no support on the other side of it... POOF no mural.

Most buildings don't have two walls with a tight pocket like that between them. These idiots couldn't have picked a worse building to use. SMH...