A long established family business in Janesville appears to riding the wave of an improving economy. Steve Yeko Jr. helped break ground on a new Diamond Center building Tuesday morning on Milton Avenue, in an outlet parcel near Arby's and Menards. Yeko says the prime building spot will offer something difficult to find at their current location inside the mall just a few blocks away. He says plenty of natural light will shine into the two story building. Steve Yeko Sr. first opened the Diamond Center in 1986. The new building should be open by February.