In Denmark, public housing is called and is owned and administered by approximately 700 self-governing, democratic and non-profit organizations by and for the tenants themselves. Many of the public housing organizations in Denmark are rooted in the early history of the labor unions and currently forms about 20% of the total housing stock with about 7,500 departments countrywide. A membership of a housing organization is usually required to obtain a rental and they are granted with regard to length of membership.