I appreciate the mention of West Oakland. I walked past Esther's Orbit Room on my way to work today. A derelict jazz club, a holdover from the time when West Oakland was flush with money and culture brought from all over by the people who worked the railways.
That was before the Cypress freeway tore West Oakland in two, or 980 sheared it away from downtown Oakland, or the trans-bay BART tracks, or before the USPS distribution center was built. The last, for those not familiar, is a 6 story concrete windowless menace that I've started calling the "Ministry of Truth."
Slums exist because the privileged spent a century paving over neighborhoods filled with people that they wished would just stop existing.