Incorporated in 1972, A.B. Systems Inc. is a design/build construction company. Based in Rochester, Minn., it constructs commercial, industrial and institutional buildings primarily in southern Minnesota. The company specializes in new construction, additions, remodel and architectural roofs. A.B. Systems Inc. has its own concrete, steel erection, carpentry and architectural metal roofing crews. It is involved with a variety of projects such as churches, recreational facilities, manufacturing, medical, retail and automobile buildings. The company uses materials, such as wood, pre-cast concretes, metals, blocks, bricks, stones, E.I.F.S., stucco or combination of these..