Essen has a new landmark: the glass tower building of RWE, a major power generation and supply company. It is 531 feet tall, and the tallest office building in the whole of the Ruhr industrial area. It testifies to a harmonious relationship between architecture, economics, and ecology. Quite apart from its height, its fascination lies in its unusual façade, which consists of a glass inner and outer shell. This enables energy to be saved in the air-conditioning and internal lighting systems. HOCHTIEF Facility Management GmbH looks after all the technical systems and the administration of the building and thus ensures the most efficient possible operation.