The Illinois State Capitol, located in Springfield, Illinois, houses legislative and the executive branches of the government of the U.S. state of Illinois. The current building is the sixth to serve as the capitol since Illinois was admitted to the United States in 1818. The capitol is in the architectural style of the French Renaissance and was designed by Cochrane and Garnsey, an architecture and design firm based in Chicago. Ground was broken for the new capitol on March 11, 1868, and it was completed twenty years later for a total cost of $4,500,000.
The building contains the chambers for the Illinois General Assembly, which is made up of the Illinois House of Representatives and the Illinois Senate. An office for the Governor of Illinois, additional offices, and committee rooms are also in the building. The capitol's footprint is in the shape of a cross with four wings. Its tall central dome, and tower roofs, are covered in zinc to provide a silvery facade which does not weather.