LOL - Hilarious to me that people have a problem with this. There was a recent development in the gaming industry that will help you deal with this issue. It's called a "save-game". See, with this nifty innovation, you can keep a good version of your city tucked away, nice and safe. Then, if you go for the courthouse (or whatever building it is), and you can't get your city back up to spec, this so-called "save-game" will allow you to "load" the original city, still all prim and proper, ready for you to keep playing like nothing happened.