General ROI on storage units

[Taylor White]

Looking to get a general consensus on ROI for building new storage units. Looking at the prefab kits, 100-120 units.

Understanding that it this is different the state by state, but interested to hear the pros and cons for people that own both multi families and storage units. What are/were your biggest hurdles with storage units so far? And do you find they are more income producing than smaller multi family units (under 4 units)? Which do you prefer managing? Which do you find have less maintenance?