The general maintenance of the historic buildings in the core is, in part, focused on geological problems. AuthenticityThe Historic Centre of Pienza has retained authenticity in terms of design, materials, workmanship, and setting. Protection and management requirementsProperty owners within the historic town include a variety of public, private, local organizations and ecclesiastical bodies. Restoration and conservation programmes have been carried out on historic buildings since the early 20th century. Conservation measures in the historic centre of Pienza are fully identified in the Municipal General Plan.