More than a year after standards for qualified mortgages took effect, a number of lenders are willing to offer non-QMs, but production has been concentrated on affluent borrowers. Lenders seem less willing to offer non-QMs to borrowers with lower credit scores or higher loan-to-value ratios. For the past year, Nationstar Mortgage has been working toward offering a non-QM refinance product. The loan would target non-agency borrowers in the nonbank’s large servicing ...