I mention this only because I see you are discussing multifamily houses and FHA in the same posting. FHA guidelines change substantially if you move into the 3 & 4 unit multifamily homes. The going average rent for those units will be utilized, in that, the 2 (or 3 in the case of a 4 unit) other units' rent must fully support the monthly payment on the new loan dissimilar to a 2 unit FHA purchase. I have seen loans go bad quickly because of this, so make sure you discuss this curve ball with your lender if you decide to move into the 3-4 unit properties.
JPMorgan Chase Bank
Investor Support Forensic Underwriter