I've been sounded out about whether I would be willing to devote part of one of the vast decaying outbuildings of the house for a "hammer mill" to make cellulose insulation, which is a pretty keen idea that would help a lot of people-- that is, some tens or hundreds of people -- in my town.
So the questions:
1. Will it pay to maintain the roof?
2. I'm lucky in that zoning is good, but what about permitting?
3. Will my taxes go up?
4. Insurance, and all the other questions of liability.
And so on .....