ABM Industries Inc. is a facility management provider in the United States. ABM was founded in 1909 by Morris Rosenberg in San Francisco, CA as a single-person window washing business. Over 100 years later, the company is one of the largest facility management providers with over 100,000 employees, over 300 offices, and 20 international locations. The company performs facility services, building maintenance services, and facilitates the outsourcing of services for companies. ABM Industries Incorporated primarily provides its services for commercial, industrial, government and retail clients across the United States and international locations.