The terminology used in residential design and construction to describe a dwelling unit's level of accessibility gets confusing rather quickly. For example, some professionals in the construction industry refer to Type A units as "accessible units". Some also call apartments in publicly-funded projects "accessible units" as well. And in my experience, many designers are unfamiliar with what an "adaptable" unit is.
With all the terminology used, discerning the correct terminology can be difficult. To remove the mystery I'm going to explain the differences amongst five terms commonly used in the design and construction of multi-family housing in Chicago. Some terms we use here may not be present in codes just in other jurisdictions, so it's important for architects and developers to be aware of this and not assume the terminology is universal.
This discussion refers to the 2019 Chicago Building Code, which becomes mandatory on August 1, 2020.