Hello,Looking at a 14 unit with room to expand (potentially 7-14 additional units or 30 storage units or a combo of each).

Our storage units were broken into down below in the basement by these neighbors, nothing was done.

If it’s feasible, how long might the process take, and what costs could I expect for the necessary permits?

It's actually very feasible to manage your own MTRs if you're inclined to do so and, thankfully, there are now loads of resources to help you do just that from PMS software to leasing, background check and payment integrations.

There’s a lot that goes into solar and power storage unless you just want to sell your leftovers to the electric company.  

I am working on the feasibility of a joint venture multifamily development. 

Storage of Value

Self storage is a business, not just real estate. 

My primary res is in a 2.25% fixed so a refi is not feasible for it.

This seems like assumptions that are simply not feasible.