Cap rates in Atlanta, GA

[Eleuterio Enriquez Jr]

Hey guys! I am new to Bigger Pockets and really trying to purchase my first rental property, whether its SFH or Multi-Family(Duplex, Triplex, Quadplex). One question that I can not seem to figure out is what do appraisers use to evaluate/appraise multi family units? Do they use comps for their numbers, or do they use a specific cap rate for the market?

If cap rates are used, can anyone share what cap rates you have seen being used lately in the Atlanta, GA area? My goal is to get an idea of what my number will look like when I am ready to refinance and pay private lenders back. 

Thanks for your help in advanced!!