I know someone who received a knock on the door one day from the police asking if his was garage number XX. Turns out, this garage was used by a criminal gang, storing goods in the garage – that they had rented from an owner who didn’t use it!
So I am guessing no formal leasing agreement. Perhaps not even a copy of ID. Just an add in the paper, someone responds. Cash in hand to the owner. Everyone is happy. But no one knows who is actually using the garage and what for.