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ANDOVER, MASS. — Vantage Builders Inc. has completed a 23,000-square-foot renovation for Casa Systems Inc.’s headquarters at 100 Old River Road in Andover. The renovation project include the redevelopment of the second and third floors of the building to allow Casa to expand its footprint from the first floor. Designed by McGuinness Group, the new space features 22 offices, room for 97 workstations, four conference rooms, a 16-person boardroom and a 60-person presentation room that doubles as a lunchroom. The building now features an open area, high-end millwork, translucent partitions and a glass staircase connecting the second and third floors. Union Office Interiors furnished the finished space.