Professional guidance can be obtained from local personal experts experienced in your particular niche.  

Maybe hire a licensed appraiser? 

Readers should seek professional advice.

Readers should seek professional advice.

Positive SolutionsProblem: In my county small multi-family houses are nearly non-existent and short-term rentals and second-cooking-areas are illegal.Solution: House-hack while renting MTR to traveling medical professionalsProblem: I didn’t know the many laws of the countySolution: A hired attorney 1) informed me that the county calls a house-hack a boardinghouse and 2) drafted a very comprehensive agreement that includes answers to your list of questions.Problem: Interpersonal problems can be a risk.

I’ve heard lots of professional investors bash LoopNet but I’ve had multiple home runs from deals I picked up there.

From what I see all the people answering to me here (and there are so many) are just coming against and refusing to agree with my simple statement: "a landlord is not above the law or norms by its personal choice or presumed capability to judge what he don't know" or as well "a landlord cannot deny or miscarriage a service to a stranger without a known valid reason and at the same time pretend to be operating professionally or loyally to the moral"Basically I'm telling if you are not able to do your business correctly it would be better to find someone else than you, mainly when your ideas about "squatter" or fair treatment are coming from ignorance or completely invented. 

Today I got a certified letter stating a lien has been placed on the property by the landscaping company they hired but have not paid.

One thing I think I would do is either hire a professional market research company and/or get a local high school or college marketing class to do market research and surveys to see if there is interest and demand. 

Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?