Strategic Staffing Solutions is moving its corporate headquarters to the Fisher Building, making it the landmark skyscraper’s largest tenant, company officials announced Thursday. The company’s move from the Penobscot Building in downtown Detroit will begin with relocating its development center operations by the end of the year. The corporate and branch offices will begin the move in early 2020. The development center and call center operations will be on the sixth floor and the corporate offices and branch offices will move to the building’s 20th and 21st floors following renovations.