BY TIM FALL, For The OklahomanJuan Guzman was hesitant to answer the knock at his door that night in the Classen Ten Penn neighborhood. He was more doubtful when the stranger on his porch offered him thousands of dollars worth of home renovations for free. Guzman and his wife, Yesenia, had lived in the heart of struggling Classen Ten Penn for about a year, long enough to be skeptical. “I didn’t believe him,” Guzman said. But it was no scam.Read more on NewsOK.com