Established in 1994, Metalstone Technologies specializes in preventive building maintenance services. It provides craftsmanship, care and maintenance services for various metal, stone, ceramic and wood surfaces. The company offers cleaning, polishing, painting, refinishing, protection and scratches removal services for elevators, window frames mullions, signs, statues, light fixtures and swing door entrances. Metalstone Technologies also provides power washing and diamond hone services for marble, granite and limestone made floors, walls and stairs. In addition, it offers restoration and renovation services for several stone and metal structures. The company employs more than 150 people and offers a range of services to institutional, residential and corporate clients. Headquartered in Boston, Metalstone Technologies maintains a location in Charlestown, Mass.