Skyrocketing student loan debt put homeownership out of reach for 400,000 Americans in their 20s and 30s from 2005 to 2014, according to a new report from the Federal Reserve.Starting from census data showing a drop of 8.8 percentage points in homeownership among that age group, the Fed’s researchers estimate that rising student loan balances account for roughly two percentage points of that drop, or nearly a quarter of it.“While investing in postsecondary education continues to yield, on average, positive and substantial returns, burdensome student loan debt levels may be lessening these benefits,” the researchers conclude.