Multi Family vs. Multi bedroom

[Kenneth Anderson]

My largest nearby city is Baltimore. After researching, there doesn't seem to be many multi-family properties. I moved here from Boston a few years ago and Boston was majority multi-families. It's odd to me there are so few here. I want to stay in good areas here too which also limits my search. What I am able to find however are row homes with 5, or 6 bedrooms. Specifically, there are some of these around a university in a good area. Rent for these is in the $4,000/month range and sale price ranges from $330-$380k. To me, this doesn't seem much different than a 3 unit house of 2+2s. Possibly even better? Quick math shows cash on cash returns over 10%.  I feel like I'm missing something. Does anyone have experience buying and renting out SFHs with a lot of bedrooms when there is a lack of multi-unit properties?

Thanks