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A.B. Systems, Inc. is a design/build commercial construction company headquartered in Rochester, Minnesota. We specialize in the design and construction of commercial, industrial, and institutional buildings. With over 45 years of experience, we have constructed over 12 million square feet of commercial building space. Our company is employee-owned and has a strong reputation for high-quality, attractive, and functional facilities. We offer design/build services, value-engineering, and expertise in Green Building and LEED certification.