The Fisher Building has a new largest tenant. Strategic Staffing Solutions (S3), an IT and business services company based in Detroit, will move its headquarters into three floors occupying 57,400 square feet at the iconic New Center building. The move is expected to be finished by the end of 2019. After renovations are complete, corporate and branch offices will move into two additional floors by mid-summer 2020. The company employs as many as 1,400 people, according to Crain’s Detroit Business.