In 1912, the second municipal gasworks in Vienna was built in Leopoldau. In 1984-87, the two gasometers were finally shut down and demolished, while the residential and administrative buildings were largely preserved. Today, the ensemble is protected as a historic monument and, as a part of Vienna's industrial history, is a source of identity. The post-industrial reuse of this area, incorporating the existing buildings, shaped the planning here from the very beginning. This ranges from the preservation of bird species to the removal of pollutants to a mix of uses in the existing buildings.