Updated rules for the city’s affordable housing, the Affordable Requirements Ordinance (ARO), were released by the Chicago Department of Planning and Development (DPD) in March will bring the 2015 law in sync with changed city development rules, but also set new standards for what is allowable for on- and off-site development. The ARO allows DPD to author and release new rules as necessary. These, billed as “clean up” language by city officials, were largely welcomed by developers and low-income housing advocates alike.