I am in the process of exploring buying two side by side duplexes in sunny California, of which, both are being sold together. In other total 4 units are being sold. My real estate agent says that we could add a unit to each duplex making properties now two 3-plexes. Meaning there would now be 6 units in total.  

If I were to do that, then go to sell/refinance would the values of the property be valued like a multifamily property or will they still only be valued off of the residential comps?

I am asking because if I can sell them valued as a commercial property then this deal makes sense, if not, turning a profit will be tougher as I am at the whims of residential comps which is always tough?

Will banks treat the two 3-plexes as one 6-unit apartment or 2 separate residential properties?

Any help would be appreciated!

Ryan