I live about 5 minute from the new hospital and i have been thinking about buying and renting to healthcare professionals. 

I definitely agree with networking - this played in role with my career in the healthcare field for the past 6 1/2 years.

If I was retired and did not have any W-2 or 1099 income I would lean in the other direction as now I have responsibilities like children my partner with the potential of ever-increasing health care costs.

Sometime thereafter, the person incurs signficant healthcare costs. 

I am looking at purchasing several properties to set up as Mid-term rentals in Tucson, ideally around the Hospitals in town to focus on traveling healthcare professionals.

Just for sake of information and discussion, the tenant presented me with an Emotional Support Animal Registration of America certificate on June 13, 2020  At this moment, I already knew I can't say No to the animal in this case, but requested the statement of proof or medical necessity from a Healthcare professional since there was no visibly evident disability that I could see.

They allow you to require a letter from the person's own health care professional.

Another strategy is putting a good chunk in HSAs so that you can eventually use that to pay medicare or healthcare premiums, etc once you're retired.

But I think as a backup plan you always have nurses and other health care professionals with St Anthony's, Bayfront, All Children's, not to mention the people moving here from colder climates, that you should be able to just swap to a furnished monthly rental and do ok. 

I found a lending service (Bankers Healthcare Group) specific for health care professionals (I will be a physician assistant next May).