Duplex is fully occupied, but I want to owner occupy if I buy.

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My duplex of interest is currently for sale but full occupied, and the leases end April 2017 and September 2017 at the end of the month. I would like to owner occupy this duplex. What are your thoughts on "forcing" someone to move, when both tenants want to stay? With an FHA loan, is there a grace period as to allowing the buyer a certain amount of time before they have to be moved in? For example, if I buy the duplex today, can I wait until April 2017 to move in?