Affordable Requirements Ordinance (ARO) Calculator
Chicago's 2021 ARO revision requires developers to provide 20% affordable units in many parts of the city. Use this tool to model the physical unit set-aside and potential in-lieu fees for your project.
ARO Modeling
Common Pitfalls with ARO Underwriting
- Ignoring AMI Targets: The required units aren't just "affordable" generally; they must target specific Area Median Income (AMI) bands, typically 60% AMI for rentals.
- The Transit Served Location (TSL) Trap: Seeking density bonuses near transit triggers the ARO, even if the base zoning wouldn't.