I would consider asking a slightly higher interest rate than market, because you are offering financing for a buyer that may not qualify for a traditional loan.

I have a great one in Kansas City for over 15 years that I've used multiple times (only auto loans however), but hoping to branch out locally as I begin my investor journey in Arizona. 

I would pull a FHA loan for $665,000 and live in one side and rent the other side out to a family member for $2,000 a month.

I have spoken to lenders about traditional financing and also DSCR loans.

Hi Lenders, currently in the market for a cash flow management tool to help organize payoffs and broker commissions to get a better understanding of how many more loans I can fund on a given month.

I assumed you'd use HELOC for down payment + another loan for the rest. that is 100% financed. 

I just re-read and realized you're talking about getting loans for lien position 2, is that correct?

Do the math at a 6% loan rate.There's a reason many apartment buildings have been converted to condos and sold.

Will he and potential buyer of the property be subject to Commercial financing or will the property still qualify for residential 4 unit and under loan types/primary?

Non conventional just means the loan will not be sold to Fannie/Freddie so they do not have to follow those rules.