A 2020 study done at the University of Chicago evaluated between 2016 and 2018, finding there's still a problem with the lowest valued homes in Detroit being over-assessed at higher rates. "Both before and after the city-wide assessment, those conclusions are well-supported by the data,"  said Dr. Andrew Hayashi. Hayashi, from the University of Virginia and others, did their own analysis of the data used in the aforementioned University of Chicago study and came to the same conclusion - that, yes, there's a problem.