Summary: Preserving affordable housing—especially in gentrification-prone neighborhoods—is one of the biggest challenges facing the new mayor. Crain's real estate reporter Alby Gallun weighs in. Plus: Some suburbs say no to recreational marijuana, United Airlines buys a stake in a biometric screening firm, Gov. Pritzker vetoes a Medicaid bill, Citigroup gets fined for loose background checks, and Livongo shares soar following its IPO. Follow @AmyGuth on Twitter and continue the conversation with #CrainsDailyGist.
