Best way to find comps for a 4 plex

[Kyle Forrester]

Hey everyone just starting out helping my bro who has flipped 3 single families homes in Mesa AZ area. Been studying BRRRR and flip strategies like mad but our first opportunity together that came up is a 4 plex in the historical Roosevelt district in downtown Phoenix. (Yea, stoked.. but yikes!) the calculators don't seem to do multifamily and google and YouTube aren't much help pointing me towards the best way to find comparable props.

Please help🤷🏻‍♂️