The Hub, home of Ameren's innovation initiatives, has received special recognition from the U.S. Green Building Council (USGBC). The building is now Leadership in Energy and Environmental Design (LEED) Gold certified, and becomes Ameren's first building to receive that designation. As the most widely used green building rating system in the world, LEED provides a framework to promote healthy, highly efficient and cost-saving green buildings. Originally, the building was a 1930s-era movie theater.