Fannie mae guidelines duplex

[Jacob Walls]

I am working on closing a deal for a duplex to house hack. One side to be my primary residence. I got a call from bank mortgage company and they are telling me that the max loan they can give us 85% value. So I would be responsible for 15% down. The property is 269k under contract. It was to my understanding if one side of the duplex was my primary residence then it would qualify for conventional loan? Can anyone validate this or provide additional resources?

Thank you,

Jake