The Major Systems Maintenance Division operates scattered sites, conventional sites and major systems maintenance departments. The department also operates several support departments, such as the renovation and training program, environmental services unit, contract inspections unit and construction contracts department. The Major Systems Maintenance Division, a part of the Philadelphia Housing Authority, is located in Philadelphia. The Philadelphia Housing Authority is one of the leading landlords in Pennsylvania, and it develops, acquires, leases and operates residential options for city residents with limited incomes. It is a government-funded company, which works in partnership with the city and state governments as well as private investors. Established in 1937, the Philadelphia Housing Authority houses more than 84,000 people in Philadelphia.