Cargill Inc. is about to begin a major renovation of its headquarters, a move that will let it eventually sublease one of its other corporate buildings The renovation, at Cargill's 603,000-square-foot building at 15407 McGinty Road W. in Minnetonka, will include an extensive remodeling and modernizing of the 40-year-old-building, said spokeswoman Lori Johnson . The renovation will include updating and replacing the basic infrastructure, including the heating and air conditioning systems.