Software developer Dexter + Chaney has broken ground on a second office building to accommodate the company’s growing work force. The new three-story, 12,000-square-foot office will be adjacent to the existing office building that the company purchased in 1999. Employees will occupy both buildings when the new one is completed in April 2008. Together, the two buildings on the 2.3-acre “campus” will provide more than 24,000 square feet of office space.