This isn't possible for us. All buildings are Static Meshes, which means they can't move or animate. We need to convert it to a skeletal mesh first of all, animate it. 1st problem is that there is no actual inside of the exterior so you can see through the mesh in other words. We would have to re-model all of our buildings. And then the second problem, we don't have the original assets anymore. They were on Havoc89's HDD, but sadly that one died....
So this is just not possible for us