HOUSTON-AREA MORTGAGE STORM SURGE: NOW A QUARTER UNDER WATER Another few months, another one of those studies from research firm First American CoreLogic — this one using data from the end of June. By that date, the firm says, 26.15 percent of all Houston-Sugar Land- Baytown-area mortgages were in a “negative equity” position. Add in the “up to their eyeballs” crowd of mortgage-holders who are within 5 percentage points of owing more than their homes are worth, and the figure rises to 33.86 percent. That’s a marked increase from the figures in the firm’s March study, which used data from September 2008. [First American CoreLogic; previously on Swamplot]