Is the ROI better on a triplex/fourplex vs a duplex??

[Jordan Akins]

My dad is a builder/contractor who also has over 100 rental properties. Iv asked him a few times why doesn’t he build a fourplex or quad plex instead of a couple duplex’s. To me it seems like it wouldn’t cost as much to build and you have more rent income. He basically just said it’s a hassle having to go through the state to get approved to build them. I was just wondering your all’s thoughts on the difference between the different sizes of appartments.