Purchasing a legal fourplex with five units

[Joshua Costa]

hey guys I've been in the background reading a lot of blogs for a while. I have learned a lot and I'm about to make an offer on my first multi. So the details on the property are that it's a legal four family but there is 5 units I'm going to be doing FHA financing. Should I be worried about anything? The property is being sold as a "fourplex".

Thanks