So a lady mother is about to be deceased due to bone cancer and her house is about to be foreclosed in September.

So I would venture that all of your examples could very easily be demonstrated to be held with the intent of productive use whether or not they generate revenue quickly or consistently throughout the year.But the RV is another story - It's not real estate so it doesn't qualify for 1031 treatment (although I do love that idea if you'll forgive me. 

I'm curious what kind of treatment I'll get when I give a single property to a PM. 

But it surprises me that a $700K structure placed permanently on a tract of land and used for productive purposes would not qualify for 1031 treatment. 

However if you go outside of city limits then the county has more lax requirements and they are subjective about what is an MHP versus what is not - sometimes it's 4 homes, sometimes more.Most water wells can support multiple homes, it's more about the treatment equipment sizing (e.g. chlorinators, filtration systems) and ability to keep up with demand, and also regulatory requirements of water testing once you have 15+ homes - it becomes an EPA thing instead of your state DEQ. 

I have a family member who recently lost her husband to cancer.

.)- Termite treatment- 1 dysfunctional water heaterAccording to contractor bids, there is at least $45k worth of repairs. 

Replacement costs of sewer treatment are something I would definitely need to factor in.

Rather than going through the RMD process, I'm considering just taking a full distribution of several properties I have in an SDIRA. How do I treat the long-term capital gain (or loss?) on my tax return? On a 1099-R, ...

It is up to the Trustee to determine if your offer price is sufficient, that requires an appraisal, and the Trustee has to assure the court that they have not given you preferential treatment.