One of my favorite sales was an old school that was closed down. I was selling it as a warehouse, but the people who purchased it actually we're part of the community and wanted to revive the old school there. It's still up and running to this day.
I'm glad they were able to bring it back, because it is a beautiful building and I hated seeing it go to waste.
Schools can actually earn you quite a lot for minimal work all things considered. You just have to be prepared to pay a lot up front for fixes that can be done in just a few months. I know someone who did this with a school, bought it for 80 grand, put 150 into it and sold it for 400k!