The document provides a monthly report on housing market inventory levels in various price ranges for detached properties in several Chicago suburbs. It includes data on the number of active listings, average days on market, and months of supply as of September 1, October 1, and November 1, 2009 for cities like Addison, Algonquin, Arlington Heights, Aurora, and others. The report aims to analyze housing inventory trends in these areas over the three reported months.