Stantec, an engineering services company, will relocate in the fall from 221 W. Sixth St., Ste. 600, Austin, to the Diamond Building in the Mueller area at 1905 Aldrich St., Austin. Stantec will occupy more than 25,000 square feet on the second and third floors of the three-story, mixed-use building. The company provides engineering, architecture, interior design, landscape architecture, surveying and project management services. www.stantec.com