Prospect Building Services provides building maintenance services for corporate, light industry and institutional clients in the Greater Boston area. PBSC is a privately owned company offering a full range of cleaning and custodial services, including floor re-finishing, carpet cleaning, window washing, post-construction cleaning, 24-hour emergency response, light maintenance, upholstery cleaning, day porter service, computer room cleaning, gym floor maintenance and special project services. The company also operates a clean room service division and a facility consulting division. Its client list includes Lycos, 1st General Reality, North Star Mangement, Southfield School and Harvard University. PBSC was founded in 1995 and is located in Malden, Mass.