How can not only the construction of buildings and entire urban quarters but also their operation be made sustainable? These are key questions for real estate companies like Bayerische Hausbau Development. As the challenges facing the construction and real estate industries are huge, it is intended that properties in Germany be operated in a CO2 neutral manner by 2045 and that CO2 emissions be reduced by 65 percent by 2030. Approximately 80 percent of the properties that will be standing in 2050 have already been built today. There are also other sustainability issues. How can companies act in a sustainable manner in the context of both society and their company, for example with regard to their own employees' satisfaction and supply chains?