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Walking away from an FHA loan
One additional penalty is you will be put on the CAIVRS ("cavers") for your default on the FHA mortgage which will preclude you from FHA financing in the future. When purchasing the multifamily unit it is an FHA requirement that you occupy one of the units.   Lastly, I would advise against FHA due to elevated costs.  Conventional options have 95% financing options, and don't have mortgage insurance that lasts forever, like FHA does.