The St. Louis Public Library is a municipal public library system in the city of St. Louis, Missouri. It operates sixteen locations, including the main Central Library location. Although similarly named, the St. Louis Public Library is unrelated to the St. Louis County Library system.
The Central Library building at 13th and Olive was built in 1912 on a location formerly occupied by the St. Louis Exposition and Music Hall and was designed by Cass Gilbert. The main library for the city's public library system has an oval central pavilion surrounded by four light courts. The outer facades of the free-standing building are of lightly rusticated Maine granite. The Olive Street front is disposed like a colossal arcade, with contrasting marble bas-relief panels. A projecting three-bay central block, like a pared-down triumphal arch, provides a monumental entrance. At the rear, the Central Library faces a sunken garden. The interiors feature some light-transmitting glass floors. The ceiling of the Periodicals Room is modified from Michelangelo's ceiling in the Laurentian Library. Renovation and expansion of the building began in 2010 and is scheduled to finish in 2012 .