The U.S. General Services Administration Public Buildings Service is one of the largest public real estate organizations in the country. It offers various design and construction services, such as urban development, construction excellence and facility access for disabled persons. The organization maintains policies and criteria regarding architecture and engineering design practices, building technology and systems, and products and materials. The U.S. General Services Administration Public Buildings Service also manages national programs in areas, including sustainable design, workplace productivity, fire protection and life safety, and design and cost benchmarking. It owns and leases more than 340 million-square-foot of space that comprises over 8,920 buildings in nearly 2,000 communities. The organization supports an environment program that is responsible for the design, construction, operation, maintenance and disposal of several federally owned real estates. It maintains a presence in St. Louis, Mo.