The U.S. single family home market is worth $43.5 trillion. Much of the country's wealth is concentrated in homes, making it the biggest asset class in the world. Over the years, investors have compiled portfolios of homes in markets all over the country that have generated strong monthly cash flow and huge appreciation. It’s nearly impossible to go wrong investing in single family homes in the right neighborhoods over the long-term. Marco Santarelli is an investor and founder of Norada Real Estate, a nationwide provider of turnkey cash-flow investment properties.