Self Storage Deal - Vetting???

[Falgun Chokshi]

I'm vetting a 12 unit storage facility in PA, which has two additional parking spots for rental. Asking price is $329,000. It has a new roof and significantly renovated exterior walls and new garage doors. No security, fence, or cameras. Only electrical is lights above each garage door.

10 units rent for $250 per month on 12 month leases (10x19 ft each), and 2 of the units are doubles (20 x 19 ft each), renting for $500 per month with 12 month leases. Each parking spot goes for $100 per month. No extra land for expansion. 

According to the seller, it's about 90% rented, with nearly everyone on 12 month leases. Vast majority of the tenants are building contractors that use the storage for their tools, supplies, etc.

So, how should I vet this? Questions to ask, things to be careful about, etc? Walk me through it. Really appreciate it.

Thanks.