Each option has different implications, so choose based on your financial goals.

I never go off of a flat percentage on anything, I analyze the costs to get to a specific return I target and analyze the risk that is involved. 70% may be an initial metric to see if it is even worth pursuing, but every deal should be evaluated independently based on costs, time and risk involved.

Mostly people with minimal RE experience are adding a single ADU and they often make that choice based on cash flow without taking into account the negative equity position.  

My question is, If one is to be strictly commission based, Is finding a broker with mortgage industry similar to finding a broker with real estate?

Look at median household incomes, look at market economy base and diversification, look at what's being done to protect and grow economic performance, just run the #'s and the message should be crystal clear. 

It's a very local question based on the comps and active/recently sold inventory inside the community.

* Do you provide move in and move out reports * How many pictures do you take of the property prior to tenant moves in and after the tenant moves out* Do you get weekly reports when the property is vacant what prospective tenants are saying about your home* Do you provide monthly newsletters to your tenants* Do you hold investor education classes to help me become a better investor* Do you have single point portfolio based management services?

A lawyer might be able to answer this better, but most rentals fall under fair housing laws (there are exceptions) and that protects against discrimination based on familial status which means children or someone who is pregnant.

.: I am trying to learn and understand... someone told me that its not just size of the home or level of the flip that determines profit, and that in some markets, what is considered a typical profit is 300k based on the 70% ARV formula.

When you say "open rate" mortgage, we would say "variable rate" and the rate would reset periodically based on some standard index.