Comping out non-commercial small multifamily.

[Mahmoud Y. Elhalawany]

Hey everyone! We typically use a comping software (Propstream) to run comps on SFRs. My question is in our market how do we comp duplexes, triplexes and quads? would we use other SFRs in the area? do we value them a little higher than SFRs in the area because they are multiunit? lets say comparable single family homes in the area run around ~$33K. Would a duplex in this area fall in line with its available comps? or is it reasonable to assume that it holds a significantly higher value? say around $50K or so. 

Thanks so much everyone!