Home » Downers Grove, IL Market Statistics (Updated) Downers Grove, IL Market Statistics (Updated) Downers Grove, Illinois real estate market statistics that are always updated. Downers Grove Months Supply of Inventory (Rate of Sale) Downers Grove Average % of Listing Price Downers Grove Townhouse/Condo Average Sale Price Downers Grove Single Family Average Sale Price Downers Grove Average Days On Market (How many days are homes for sale) Downers Grove Number of Homes Currently For Sale