estimating rental prices

[Jose Valdez]

Hello everyone! I have been trying to analyze deals and how much the projected rental income might be. What is the best way to, for example, estimate rents on a duplex? I usually type in the zip code when doing this and try to check different sites(rentometer, zillow, rent.com etc) but a lot of the times cannot find any duplexed, just apartments or SFH. Will a duplex be maybe a little closer in price to an apartment? What can you use as a good comparable and what other things are important to check for( square footage, number of bedrooms/bath)? I may be overthinking this but it would really help out to get clarification to feel more confident when analyzing deals. Thanks!