seoul's mayor oh se-hoon is currently in vienna for the ‘world cities summit mayor’ on the topic of ‘sustainable urban development’, which is being attended by representatives from over 70 countries. as part of his visit to vienna, he also went to see our projects NB1 and taborama in the “nordbahn” district to discuss social housing and sustainable construction in vienna. both the mayor and the numerous members of the press were very interested in the guided tour by architect peter sapp.