Purchase and sale as well as rental and management of properties; provision of architectural and engineering services as well as planning and construction of buildings of all kinds as general or total contractor; development of building land and financing of buildings; acquisition, development, management and exploitation of patents, licenses, innovations and manufacturing processes; trade in, import and export of goods and products of all kinds, in particular also with works of art; financing and promotion of all kinds of businesses; performance of fiduciary transactions; acquisition, management and disposal of real estate; participations.