DETROIT – Officials with the city of Detroit announced Thursday that property values increased an average of 8% for the city. Still, there are those who think the assessing process is weighted against the city’s poorest, and Duggan is challenging those claims. “Property values in the city went up 8% last year,” Duggan said. Duggan presented a map of Detroit where green areas meant increased values and red meant decreased. Detroit is a unique market and you can’t get those nuances simply from a sales study.”The official data from the city of Detroit can be found here.