Questions about shared basements in duplex

[JD Mims]

Hi everyone! Just looking for some feedback on shared space in basements. I am rehabbing a duplex that has a shared basement. 

A mentor of mine feels like this could create a liability with both units having access to the basement. 

My property manager says that she has many shared spaces she manages and has never had a problem.

Just looking for any feedback or experiences anyone has had? Anyway to trouble shoot this?