This building also houses the Municipal Archive of Alcorcón. It was opened in 2006. The name Ciudad de Nejapa corresponds to the twinning that the municipality has with the town of El Salvador, with which the City Council of Alcorcón developed various cooperation projects.
It consists of five rooms, all of them independent. With lending and consultation services of books, audiovisual and multimedia material of direct access, reading and consultation of magazines and press. With user training for infant, primary and secondary education.