Zechner & Zechner emerged as winners from the two-stage planning competition to work alongside structural engineers, Thomas Lorenz and building services engineers, Moser & Partner on OBB's Corporate Headquarters in Vienna, which will be built in the immediate vicinity of the planned new Vienna main station. The aim of the competition was to find an outstanding planning concept for the corporate headquarters, which was to provide optimal working and communication conditions for approximately 1,600 employees from various different OBB companies. On the lower floors of the building complex, central facilities and some external uses round out the office site‘s features. The awarding body was keen to achieve an office and space concept that was state of the art and complied with the following planning principles: the corporate headquarters should be efficient in its energy, space and construction costs; the environmental impact of materials used should be minimal; conservation of resources and their longevity should be considered; the building should also be flexibility for adaptability to various users.