A financially independent social worker says his sober-living rentals return up to 75% on his cash. Here's how the niche strategy works.

Scott and Rebecca Steenbergh say their real-estate investments helped them purchase their dream home. Courtesy of Scott and Rebecca Steenbergh Scott Steenbergh turned sober-living rentals into a high-cash-flow real-estate niche. He says the properties can produce cash-on-cash returns of 50% to 75%. Real-estate income now covers his family's lifestyle and gives him more control of his time. As a social worker, Scott Steenbergh never seemed to be able to clock out. "The hours were always…