Resources & Data

Learn more about our efforts to re-legalize four-flats and how this change can benefit Chicago.

Information Packet

Our comprehensive information packet provides data on how legalizing four-flats can benefit Chicago neighborhoods.

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Research & Evidence

Here's what the research shows about allowing more housing types in residential neighborhoods:

Urban Institute Research

Urban Institute findings

The Urban Institute found that allowing multi-unit housing in more areas improves affordability without disrupting neighborhoods.

Minneapolis 2040 Results

Minneapolis 2040 plan results

After Minneapolis reformed its zoning to allow more housing types, new construction increased while maintaining neighborhood character.

Maps & Data Visualizations

CTA Rail Access

Map showing Chicago areas within walking distance of CTA train stations

This map shows areas within walking distance of CTA train stations, highlighting the potential for transit-oriented four-flat development.

Bus Route Accessibility

Map showing Chicago areas serviced by CTA bus routes

Four-flats near bus routes would ensure all Chicagoans have access to affordable housing with good transportation options.

City Wide Frequency

Map showing Chicago community areas by two to four flat prevalance

Some community areas in Chicago already have many of their homes in existing two to four flats.

Tax Impact Analysis

Chart showing tax revenue impact of four-flat buildings

This analysis shows how four-flats can increase municipal revenue while keeping per-unit housing costs affordable.

Who Benefits from Four-Flats?

Who benefits from four flats

Four-flats provide housing options for a diverse range of Chicagoans, from young professionals to families to seniors.