The Lower Paradi level is the core structure of the city; like any good foundation the people who live there are also the biggest necessities to the city. At least, this is the line the politicians give.
The truth is that the lower level is the closest thing to urban hell Paradi can offer. Like they say, shit rolls down hill, and literally in this case. The nice self-melting streets above dump all their water, snow, and sleet... which flows into Lower Paradi.
Light is sporadic down here as the sun rarely touches any but the outskirts of this layer and the overhead light system often ends up in disarray from draining water or sabotage. The bulk of the city's sewer treatment and reclamation plants are on this level, as well as companies looking for places where the regulations aren't as... stringent.
People are living near-death constantly down below in the “miracle” city and those are the ones better off. Police sirens are almost never heard down here and the people are a shambling, half-dead breed more akin to tribes of neighborhoods than a cohesive society.