Adding a fourth unit to a 3 family

[Julie N.]

I’m in CT and just bought a 4 family house that was operating as a 3 family. The owner had converted one of the floors (that had 2 units in it originally) into a single unit. It is still listed as a 4 family on the field card but the agent listed it as a 3 family and the appraiser also appraised it as a 3 family. I want to bring it back to a 4 family and Refi it. How much more value will adding a unit add to the house? I won’t be adding additional sq footage- so it would just be dividing up that one converted floor and bring it back to its original floor plan.