Detroit faces serious challenges from property speculation. Investors such as Allen Shiffman, Matty Moroun, Michael Kelly and Matthew Tatarian often buy property from the city and county at steep discounts with hopes to resell the properties to other parties - including, ironically, the city and county - at a huge profit. The business models of each speculator range drastically, however, so it is difficult to predict their behavior at auctions. Using SEMCOG and City of Detroit Assessor data, this map suggests that Kelly and Tatarian focus their purchasing in several areas of strategic importance to the City of Detroit. As of 2009, the two own about 1,500 properties. This map details the density (# properties/square mile) of their holdings.