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FENTON, MO. — Keystone Construction has completed the renovation of UniGroup’s headquarters in Fenton. UniGroup, the parent company of multiple transportation-related companies, is offering excess office space for lease. The campus totals approximately 450,000 square feet and is situated near the interchange of I-270 and I-44. The multi-million dollar renovation included upgrades to the HVAC system, roof, façade, windows, workout facility and cafeteria. Keystone Construction served as contractor and ACI Boland was the architect. NAI DESCO has been hired to market the 50,000-square-foot vacant space at One Premier Drive.