Slums:

Kumen City's slums is one of the most extensive areas for the entire city. Each quadrant has their own slum areas underneath the city and while the Quadrants are run differently by each Corporation - with checkpoints and the fanciest technoloy to see who is passing around upstairs, down below in the slums it is much more lax. This makes it feel more like it is one giant slum. While they are not able to leave the city right now, they citizens can at least move freely between the Quadrants.

The Slums are made up of the original city before Kumen City began to build on top of itself again and again. This means the structures down there are some of the oldest structures in the city. All the roads and vehicles that do work are designed to be non-flying or at least low altitude. Many of the buildings are in decay that have not been maintained, but what buildings are still standing are a mix of art decor, cyber punk type building, noir like buildings, and more.

The people below cannot grow their own food easily so they rely on the Corporations for their supplies or what they can get from the outside. And a lot of the areas are gang controlled where the Corporations do not have a hand in things. Meaning the people are squeezes there as well. The police's presence in the slums has been pulled back compared to the old days, having their offices on the middle and top levels.