Comps on 3 duplexes. Residential or Commercial?

[Christian Thompson]

Hey Yall! 

I am currently working on a off market deal. It's 3 duplexes. They are right next to each other with the third duplex being behind one of the others (2 duplexes on the same lot). I work with seller. He is having trouble getting a couple of the units rented and the units are outdated. He hasn't given me a price yet, but he is willing to seller finance.

If I am able to get this property my plans are to bring it up to date and then refinance out of the sellers finance. I will also house hack this property. 

My questions is: When I go to refinance would the lender look at this property as commercial or would they look at it as residential? I know the appraisal would be different for commercial seeing as they would use a cap rate.