I understand there are other factors such as pitch etc. but i am trying to get ballpark range. 

Just make sure everyone understands that they will be on the site for anyone to see.And no minors.

The local branch manager got involved, couldn't understand what I was explaining either, didn't want to admit it, and got defensive and shut down when I tried having my attorney explain it to her in a different way.

My goal is to understand the current demand and rental potential for ADUs in this part of the city, as well as the costs involved in building.

I would recommend investing in something that you understand. 

Originally posted by @Sidney Wilson:I understand that it is sometimes easier to have a broker do the work to find a lender, but the 1% + I always paid to brokers was a fairly significant cost.

My understanding is that after a year you can move into another house hack and get another FHA loan.

@Monica Juarez-Gonzales Adding to prior note that @Michael Plaks has created the best resources and content, bar none, to help investors understand how to approach Cost Seg.

Are there any good books to start understanding this niche?

However, understanding their requirements—such as down payment percentages, reserve requirements, and loan-to-value ratios—is key to getting approved.One of the biggest advantages of working with portfolio lenders is their ability to fund deals that traditional banks might pass on.