Buy and live in a multifamily, but not considered residential?

[Patrick Crehan]

I want to purchase and live in a multifamily (it would be my first property purchase). It is currently being rented out as 5 units, with one unit in the basement. The seller (which is my landlord currently) says that different appraisers have argued that it could be a 5 unit, while other have argued that it is strictly 4 units, with the 5th basement unit being a hack. Now, in order for me to get an FHA loan, it must be residential, and that would work if the building had 4 units. Im not in dyer need of purchasing this specific building, but my landlord is prepared to work with pricing, plus the cash flow looks pretty good. So, Im asking you guys what I do in order to be able to live in this property with an FHA loan. I feel like it is an obstacle, but maybe there is a simple solution to the 4 unit residential-5 unit commercial cut off line that I am not figuring out. How do I make this into a 4 unit residential?

By the way, the auditor site says it is logged as a 4-19 unit building. Hope that info helps.