However, we have probably about an acre and a half in the back that I think would be perfect to develop into a storage unit space (easy access for any size vehicle, etc etc.).

One way is to increase the rental income on the building as well as think about other streams of income from the property, perhaps there's parking or storage you can rent to their neighbors who would need it?

Charlotte is bustling with real estate events where you can connect with individuals who’ve been in your shoes.

@Matan ParetMatan,As a fellow physician and real estate investor I was in your shoes 10+ years ago. 

RV, Boat, Truck, or Storage business owners out there!

Or to self storage

Hey Gino, I was in your shoes about 3 years ago.

RV park, self storage, other? 

Private storage locker adjacent to residence.

The next one I’m looking at is either self storage or smaller mulifamily 10-50 unit value add fund.