We had a duplex near the medical center that we sold back in 2018. 

Lets call that the :( side.2) And there is the happy side... passive income (syndications, passive partnerships ie medical/dentist offices) and passive losses (depreciation, bonus depreciation via cost segregations common in syndications).

Is there anyone here who mandates HEPA air filters for tenants using medical marijuana in states where it's legal?

However, he has a history of drug use as well as medical issues that could cause him to pass any day.

For example, if you borrowed money against your rental, which a clearly a business, and used the money for family medical expenses, that would be a consumer purpose loan.

We have had tenants that were relocating to Indy, medical students coming to Indy for training, and short-term vacationing visitors. 

They must be prescribed by a medical professional.

I think I'll be a rarity in the medical field if I profit share.

I had a friend who did AirBnB in his home and had a steady stream of renters for various events in town as well as corporate / medical folks who come in for a few days at a time.

And if investment funds gave all the millions for altruistic reasons, why not for medical development?