The Central Government Real Estate Agency works for and on behalf of the Dutch State. They are responsible for managing and maintaining the largest and most diverse property portfolio in the Netherlands. The portfolio includes prisons, court buildings, military barracks, airports, defence sites, ministerial offices, ports, tax offices, listed buildings and historical monuments, museums and palaces. The Agency makes these buildings and sites available in order to meet the property needs of central government. Their expert staff develops strategy and policy and supervise the management and maintenance, purchase and sale, construction, remodelling and renovation, and development and redevelopment of properties in the portfolio.