Cornerstone Construction Services, which owns offices on Pioneer Trail as well as in Burnsville, is a commercial contractor with significant design and engineering capabilities. The firm specializes in commercial, retail and medical interiors in the Twin Cities, as well as hotel renovation work nationally. Cornerstone's proficiency at providing quality work on schedule and on budget has earned it a healthy stable of repeat customers. Partners Bruce Haverly and John Keil each have more than 30 years of industry experience and enjoy doing business in Eden Prairie's diverse business community.