In the course of (further) developments of cities, settlements of industry, altered infrastructure routes and / or simple faulty planning inevitably lead to brownfield sites which, despite their sound location, are not part of the urban structure. The challenge is to find new concepts for such areas and to use them for the redensification and upgrading of a district. This work deals with the (re) integration and reassessment of such a place. An attempt is made to develop solutions for an urban problem and to generate a reinterpretation of a public space. In Vienna, it is possible to (re) join two apparently separate districts by means of such an unused area and to develop a new urban quarter. The southeast tangente within the range of St. Marx separates the third from the eleventh district in an unpleasant way, while at the same time the space below the traffic area offers no added value for the people living in the surrounding. Furthermore, road traffic noise is a significant burden and devaluation for the circumjacent area, which makes functional mixing difficult. The task is to discover an underutilized urban area and transform it into a lively public space through the cooperation of living, working, culture and leisure, which might be the missing link between two separate districts. It is also intended to be made accessible to the public through new significance and vitality while at the same time reducing the problem of noise pollution.