The participation of the University of Patras, Architecture Department, at the 13th Architecture Biennale in Venice with the Common Grounds School project was based on the delegation of selected projects of design studio 4, working on the subject of Polykatoikia. The idea was based on the belief that it is an eminently Greek theme that arouses international attention and is constantly developing over time. Moreover, housing in the city is always a common ground in the field of architecture. The participation consisted of scale models of 30 projects spanning different academic years. The homogeneity of the presentation of the work highlighted transformations and variations of the building in time, both within the educational process at the Architecture Department and the general research about the city.