If you have the vector (.ai, .eps) files you can create files/prints to cover an entire building if you wanted to. Because vector files are mathematical curves and lines there aren't any pixels to limit your size. That being said, I'm sure most of the original art files were vector but also lost to time so you would have to get them redone. Now something with photos like TMNT would HAVE to be scanned and touched up.
Unfortunately no easy answer here.