He is currently in a halfway house/correction facility.

While my helper was on your standard rental showing appointment, talking with another interested party, a young woman unlocked the window in one of the bedrooms in the back of the house and the top part of the window slammed down on her fingers.

Tenants learn from our behaviors, we set the the standard.

I am not sure about a rent by the room comparison vs their standard single family or small multifamily estimate, so I would check with potential lenders to see what they will consider.

Personally, I have very high standards.

If you can't do the standard 20% for rentals, look at duplexes where you will live in half and rent the other half. 

However you also have to consider what you're going to do when your tenants move out at the end of their one year lease, and how long it may take for you to find new tenants that are suitable to your standards. 

And 15 years isn't exactly short term; it's a standard term in the US.Is this a pre-construction purchase with developer financing?

When I suggested adding something specific in the offer that says “buyer can back out if appraised value is less than X”, they suggested to deal with this after the offer stage and at attorneys review, and use the brokerage’s standard/unmodified contract until we agree on the price.Am I overthinking this?

Is there a standard set of terms?