Multifamily rent estimate

[Elisa Sacchetti]

Estimating multifamily has been pretty tough for me. A real estate agent told me that I can estimate duplex rent by comparing it to apartment rents. If the duplex is a 4x4, then I was advised to look at the rent for 2x2 apartment and use a number close to the lower average for my rent estimate. Is this a good way to estimate rent? Zillow and the BP calculator I have found doesn't give me good estimates for multifamily. I use apartments.com for my apartment estimate