These buildings are eight hundred meters from penthouse to foundation. The lowest levels aren’t even used anymore, because the streets have been abandoned except for the criminals and wastrels living off the grid. If you ride the lifts down to the lowest lobbies, you’re still ten stories above ground level and the stairwells leading further down are sealed.
In some buildings, there are balconies that low. Teenagers with too much time on their hands sometimes have flashmob parties where they throw anything that’s not nailed down at anyone they see below.
Security usually puts a stop to it fairly quickly.