After 200 years and a nuclear winter most structures should be long gone.
Wood would be long gone, brick would have crumbled, metals and shingles would be rusted, melted, or blown away by 200 years of sun, hail, ice, wind and snow, even concrete would be suffering.
Course I'm also sure that in 2077 (42 years in our future), they had new super weather resistant exterior paints that helped the local wooden structures survive 200 years of nuclear winter instead of being piles of dry rot ridden boards.
One of the first mods, I'm looking forward to loading up is a green wasteland mod.
It looks like the assets are already there in the prewar scenes so it won't take much.