HOUSTON-One Oak Park, a new six-story, class A office building in the Westchase submarket has increased its occupancy from 37 to 85% by signing 70,902 square feet of new tenants. The activity illustrates the marketwide trend in class A office leasing, according to Michael Anderson of Colvill Office Properties, leasing agent for the building.

Anderson tells GlobeSt.com that One Oak Park delivered in April 2009, and its lease up is right on schedule, despite the recession that has gripped the country for the past three years. “Demand for class A space across the city has been strong,” he says. “There is a real flight to quality that is going on.”

The marketwide vacancy rate for class A office space was just 14% at the end of the fourth quarter 2010, according to Grubb & Ellis Co.’s most recent market report. In comparison, the class B office vacancy rate was 18.8%, and the class C office vacancy rate was 16.2% for the same period.