A new 1 percent home loan product has quietly hit the market to help qualified, cash-strapped borrowers overcome one of the biggest obstacles to homeownership: downpayment. With significant variation in details, the 1 percent down mortgages offered by Quicken Loans and Guaranteed Rate stem from their partnerships with Freddie Mac and are structured as part of Freddie’s Home Possible Advantage program. In Quicken’s version, the borrower pays...