This research project looks into the origins of Greek urban landscapes, a homogeneous form of urbanism shaped by the perpetual repetition of the apartment building type of ‘Polykatoikia’. The interventions are organized through two generic instruments: the Suffix and the Appendix. Τhe space upwards a city block is determined as the Suffix. In the case of the existence of an empty plot in the block unit, this three-dimensional space - from the ground level up to the top of the city block - is determined as the Appendix of the Suffix constituting the way of communication between the Suffix and the public street space. The Suffixes and the Appendixes have been conceived as places where practices of commoning can penetrate the city and mainly the lives of the inhabitants. They are places of collective edification, conflict and assertion; above all, they are acts of resistance in the contemporary undocumented urban land.