Seoul City Hall is the main government building of Seoul, the capital city of South Korea. It serves as the headquarters for the Seoul Metropolitan Government and is responsible for the administration of the city. The building features a modern design, with a large glass structure that contrasts with the historic Seoul City Hall building next to it, which was completed in 1926. The new City Hall, completed in 2012, is known for its eco-friendly features, including a green roof that helps regulate temperature and reduce energy consumption. It is located in the heart of Seoul, making it easily accessible to residents and visitors alike.