Bill Knapp, a leading business figure and philanthropist in Des Moines, enjoyed a rags-to-riches rise that took him from a poor, southern Iowa farm to create and build Iowa Realty into the state's largest real estate company. Along the way, he became one of Iowa's most accomplished real estate developers. How exactly did he do it?Like all successful entrepreneurs, Bill was blessed with drive and determination as well as intelligence and vision. But...