We have many investors who started out their RE investing journey by managing their own SFR rentals. In fact, I also started the same way.
However, you quickly reach a point where you realize it is hard to scale and that managing even 10-12 rentals becomes a full-time job. So many turn to multifamily for scale and in order for a property to afford dedicated property manager and maintenance, you need 80-100 units (depending on the market) minimum.
One big difference between single-family rentals (which is what most individual investors may be currently investing in) and multifamily is how they are valued. SFRs are valued based on the comps in the area while multifamily is valued based on the Net Operating Income. Even 2 identical MF properties next to each other could have very different values if the NOI is different.
In Multifamily, every dollar added to the NOI results in a 20x jump in value at a 5% cap rate. Add on leverage and depreciation benefits and this becomes a very powerful business model if operated well.
There are also benefits of managing the property if you have the scale to do so. This is why many of our investors choose to invest with us as they know there are 20+ people dedicated to overseeing our investments.