I think you are correct in your thinking - a lot of lenders right now are pricing 30-year fixed rate and 5-year ARMs essentially the same, with only the slightest benefit to the ARM option - generally because there is a very low probability priced in that rates will be higher in 5 years. 

Ultimately, everything unfolded according to plan, reaffirming the importance of perseverance and foresight in navigating complex real estate transactions.Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

When adding LVP make sure to have the temp up to at least 65 Degrees Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

I bought after reno but added brand new 5 Ton AC unit, dual sets of washer and dryers.Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

What construction lenders have others used for prefab or modular projects?

It is not easy to find lenders who loan under 100K.

An appraisal would have costed $400 and if you need a name ask a lender.

I guess the owners squared up with the lenders last second. 

@Shawn ChervinskisThere can be no direct or indirect benefit between you and the plan, and the fact that you would occupy a unit of the duplex is a 100% deal-killer for an IRA or 401k.You could use a Solo 401k to purchase a property held entirely by the 401k, and to which all expenses and income are attributed to the plan.A 401k (or IRA) can use non-recourse financing, but typically non-recourse lenders will want to see more like 35-40% down and a minimum of 10% cash in the plan for reserves.

This is the private lending bible.