OneSource Facility Services is a division of OneSource Management. OneSource Management is a provider of outsourced building services. The company offers commercial cleaning, green cleaning, engineering services, landscape and golf course maintenance, tenant services, airline and airport support and staffing services. The company employs more than 31,000 people through more than 90 offices located throughout the United States. Its operations serve more than 10,000 customers in more than 40 states. The company serves a variety of markets, including the aviation, commercial real estate, construction, convention center, theme park, business and commerce, government, industrial and manufacturing, institutional, retail, janitorial, and resort industries. OneSource Management s corporate headquarters are located in Atlanta. OneSource Facility Services has a branch office in Somerville, Mass.