It's a can of worms, unless there's something that all the rents have in common and that can still be a headache (students, medical professionals, etc.)

He never has explained to me why he has held on to it for so long BUT he is in the medical field so it works for him.

It is a massive industry and I can point to a Storage Facility in FL (one of many that were seller-financed) that was done with seller financing.

Allen L stated the benefit of the medical system in Europe.

He now works in a different, but not totally unrelated industry and loves it (medical devices R&D).

The protection is great as an LLC, but if you are flipping houses with the LLC the IRS looks at it as a business and you get taxed at the state and fed income rates (brackets you fall within), a payroll tax at 15.3%, if the company is making over $113,700 a year it get's taxed an additional 2.3% medi-cal, and any employee making over $200,000 gets taxed at .9% for medi-cal. 

Explore other types of investors who would also have an interest in land--mobile home parks, RV parks, RV and boat storage, self storage facilities, junk yards/tow yards.

She has recently been admitted to a memory care facility. 

I’m Houston based and am part owner of units less < 5 miles from the medical center.

Oh yeah I just added a small self storage facility 3000 miles away.