Investing in the Chicago South Suburbs depends on your strategy. If you're investing 100% for cash flow & intend on holding the property forever then it's just a matter of running your numbers for rent minus expenses to see if you can hit your target profit margin. If however you're concerned with cash flow & potentially selling your property later w/ either a small appreciation in price or at least no reduction in value then you need to be careful where you invest in the South Suburbs.