You can add two detached ADU's and convert 25% of the multifamily units to ADU's in extra space (i.e- garages, boiler rooms, storage rooms, ect.) 

A little insurance with thorough inspections could save you a big headache in the future.If I were in your shoes I would also talk to the neighbors. 

I thought for an alternative solution and started searching online for storage units and came across a couple of self-storage units.

Been thinking about this here in Louisiana to get some smaller climate controlled storage units or 1 bedroom efficiency apartments....

depends on the real estate setcor, there many types of renters, blue collar, white collar, commercial, storage, admin. etc.

The bathroom portion of this apartment sticks off the back of the building and has storage area just below it.

@Alex Ko - I was pretty much exactly in your shoes about two months ago.

@Candace PriceHaving one property per LLC is likely overkill based on how you are describing it(multiple bank accounts, credit cards, record keeping).If I were in your shoes - I would likely have a different entity per asset class.

This shows us down to the cent where every penny is going, cash on cash returns, current property values, futures, has document storage for leases and receipt you can easily upload to every unit or property.

Were the shoe on the other foot, and I were the contractor, I would have very quickly apologized for the mistake, refunded the money, and returned all the deposit for the second side.