You can use your accounting background as leverage for a win-win relationship with a local investor for sure.

In my (admittedly biased) opinion it's the most interest market right now that allows for both cash flow and appreciation.I also self manage but I would not recommend that for someone starting out unless you simply plucked something from the MLS that already has a tenant in place.

Can I simply not-renew the lease at its term ?

Some of the only methods Ive come across involve simply looking at the age of the homes in the neighborhood or comparing the amount of development in the area to surrounding areas.

SF is winning me over at the moment because I'm a beginner, but I'm sort of stuck in analysis paralysis right now trying to decide.Thanks in advance! 

This sounds like it might be a win-win, Hospice has plenty of funding to be a reliable renter. 

Either way, I recommend finding peace with what you can't control (whether that is eviction or them living in the mobile home); otherwise, you let the siblings keep winning if they impact your happiness.

Because they are new to the business, they assume it is a commodity based business and they win business by being the cheapest option.

You read the current minimum size for a buildable lot in the code requirements outside urban areas, specially when septic is involved, and these lots simply don’t pass.

If both agree, it seems like a win-win as the new tenant gets to move their stuff in over a few weeks and the old tenant doesn't have to pay the full month's rent.