Your city is not laid out as a single-celled organism, with a wealthy nucleus surrounded by an ooze of slums. It lacks sufficient mass transit to move all of its workers twice daily in the fashion this would require. It also lacks, since the end of colonization generations ago, governance powerful enough to dispossess individuals of their property in sufficient numbers. Accordingly, the poor live near the rich. Wealthy neighbourhoods are often divided by a single boulevard from factories and markets and graveyards, and those in turn may be separated from the homes of impoverished only by an open sewer, railroad track, or narrow alley. Your own triangle-shaped community, not atypically, is bounded by all three.
This gallery contains 12 photos.