Investing In Chicago Area

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I am new to real estate investing and am looking for some guidance from people in the Chicago area. I have read a few books including "The Book On Rental Property Investing" by Brandon Turner and it has really grabbed my attention on how beneficial investing in rental properties can be to your financial state. I have been scanning the Chicago area and the suburbs west of the city to look for duplexes and triplexes that could get my portfolio going. Unfortunately the properties i have seen do not seem like very good investments. On the other hand i have looked at foreclosed properties in the west suburbs that seem as if they have great potential. My main question is for investors that are in the chicagoland area. At the moment what type of real estate investing is this area good for? i have my thoughts but i wanted to get insight from skilled investors.