So for the 4 unit you can kiss the 30 year fixed rate mortgage goodbye :) In all likelihood it won’t meet mortgage minimums.3.)

I firmly believe that the lease is a contractual agreement that must be respected on both sides.

Use your standard rental agreement.

I think it is smart to have a minimum cash flow goal, because anything less than $100 - $200 per door could easily be eaten away by higher-than-expected repairs or utility bills... and then you end up in the negative cash flow zone.

There are some caveats we would need to work through; I have two brothers that technically each have a third ownership per the trust (this would work out to 25% ownership for them each based on the current math since I already 'own' [on a private loan agreement with my parents] 25%).

@Lloyd WinstonYou and your brother may need to look to speaking with an attorney to draft up a partnership agreement/LLC operating agreement.

It could be that the property is being sold for $35K and the owner knows that bank mortgage minimums are typically $50K. 

When I called the TN Dept of Revenue (they surprisingly picked up right away) they said that I had not paid my minimum tax claimed on my TN tax return. 

I suggest you learn to do a more detailed financial analysis and set criteria for minimum returns before you make a bad investment and learn the hard way.

At a minimum, I want to leave every person I speak with a business card so they have a way of contacting me whenever they do decide to sell their house.