United Maintenance Company serves the janitorial needs of the commercial and residential customers. The company is equipped with a variety of cleaning equipment. It undertakes projects for convention centers, hotels, arenas, theaters, and office and health care facilities. United Maintenance Company is a part of United Service Companies, which operates several subsidiaries, including UUnited Supply Services, United Temps and United Security Service. United Service Companies, through its subsidiary, United National Maintenance, offers labor for a range of convention, tradeshow and event cleaning services. The company has completed projects for the Las Vegas Center, Orange County Convention Center, Thorek Hospital, Chicago Hilton and Towers and Dallas Convention Center.