Has anyone heard of investing in residential treatment facilities (group homes)?

I would personally just visit those new mobile home models and copy every inch of them exactly, including wall and floor treatments, cabinet hardware, etc.

To involve a mortgage broker or lender to write up the deal for a 4k note with fees from a few hundred up to $500 is crazy IMO.I think as long as you are doing business ethically and adhering to your state's usury limit (18% here in FL) you should be ok but I'm certainly not an attorney.

And you'll get positive tax treatment for the cost of your financing. 

Are their professional and ethical standards in line with your own?

Did they have to do ozonation treatments or any other extreme odor remediation?

If you own it at least as year you will get capital gains treatment on the proceeds. 

These are professionals with additional training and a stricter code of ethics.

They swab, tell you the level and threat risk and provide a treatment plan if necessary. 

It may be helpful to consult with a legal professional to ensure that the commission arrangement is in compliance with all applicable laws and ethical guidelines.