Vantaa City Hall was renovated, and a new council meeting room was constructed. In one part of the project, Pessi children’s art centre, housed in a building originally designed as a municipal library, was renovated. City Hall, completed in 1957, and the library, built in 1958, were originally designed by architects Olli and Eija Saijonmaa. Both buildings are listed. The wood pile foundation was reinforced by jet grouting.