McMahon's of Winnetka – McMahon's of Winnetka has been providing the finest of estate and house sale services since 1977. This family owned company has the expertise and understanding to guide you through every facet of this unique experience. With our accurate appraisals, effective marketing and experienced staff, McMahonâ€™s of Winnetka offers the personal service and attention to detail that insures successful and profitable sales.