Any Building code about putting concrete blocks on ground?

[Phil C.]

Hello colleagues,

While we started working on an apartment building (15 units) at Atlanta downtown (GA), we were told some strangers drove cars through the parking lot to the lawn backyard during some nights. Tenants are concerning about the night activities from those strangers. 

I got an idea on permanently putting some concrete blocks (6 by 12) on the ground to prevent strangers from driving to the backyard of the apartment building. Does anyone know if there is any building code related to that or not? Or if you have any other experience or idea to get strangers away from the property, can you please share with us? Thank you so much!