Check for cap ex coming, mechanicals, and smart repairs to do now that will save you later.

Their combined monthly income is 3X my rental amount but the man's income is in cash (he is a car mechanic).

If the building is currently recognized as a single family residence,  then you are changing use and presumably will need to sprinkler the building and satisfy other fire rating and STC rating requirements not to mention the added costs of having to run mechanicals for multiple units, multiple kitchens, additional bathrooms etc.  

I don't like mixing the two - it can get messy if he stops mowing due to mechanical or health issues, etc.

But I'm not familiar if title could get clouded from another mechanism at the state DMV for instance Thank you for your response!

My four adult children are out of the house; so, below are goals for our 11 year old and me.Read 15 minutes per day and log it.Set limit on daily electronic use.Clean up after himself (toys, push chair in, dishes, clean bedroom, clean car).He plays sports and has a few tough baseball goals that he works with me on (inside/out swing, pitching mechanics, 3B fielding). 

All your mechanical will be about the same as if you were building a much larger house. $120k for 200 sqft seems reasonable. 

As an investment property owner, this means less maintenance and fewer unexpected expenses from storm related damage, often resulting in more affordable insurance premiums, less wear & tear on mechanical equipment, roofing materials or exterior surfaces.

It now makes me question whether other platforms, like Avail, are also allowing the tenant to pay via credit card and we as landlords are just unaware of the mechanism because it's a side of the transaction we don't have visibility into.

The threats of leins were not working, as truthfully I had no idea how mechanical liens worked at the time and would just contact a lawyer who did understand them. ( I since have, a lien was placed and it was fraudulent) He began to dismantle the electric after breaking into the breaker box.