All the buildings that made up the slums were standard low-cost housing, which was the kind of building that maximised the use of land area. They naturally did not take into account natural illumination, air quality, view and so on. The building designers had only one concept in mind, and that was the concept which their superiors had repeatedly emphasised:
"I have only one freaking requirement for your design: just stuff as many residents as possible into each building! Stuff, stuff, stuff!! Stuff it so full that there won't be room for a stamp. Who cares about art, aesthetic or comfort! Even if you build the houses into presidential suites, the poor-ass people who'll live here won't be able to pay an extra penny!!"
230 different designs were proposed at the time, and the final winner was an unknown designer. It was said that he had referred to the architectural layout of a certain overpopulated city in the Old Earth era...