The present research paper attempts to answer the totally general question, why is the Greek city like this and specifically why is Greek city of Volos like this. The complex urban fabric is composed on the one hand by the number of General Building Regulations and on the other by the special regulatory plans of each area. The main research interest revolves mainly around the city skyline with the heights and areas of the buildings that seem to affect the free, accessible public space. The aim of the work is to select two O.T. in the center of Volos to analyze how the skyline changes through the four most recent GOK, i.e., GOK 55 which gives the starting point for the high-rise buildings in the city. The research is divided into two parts, initially the general part with a historical review of the history of the ΓΟΚ(general building codes) from the beginnings of the Greek State followed by the conclusions of the comparison of the various elements of the regulations. The second part is based on the history of the city and the events that led to the adoption of various building regulations over the years, with a milestone in the reconstruction of the city after the earthquakes and floods of the 1950s. Finally, we focus on a part of Mavrokordatou Street, where in its longitudinal section the findings of the comparison of the first part of the research are applied, however, keeping a fixed point, a remnant of the city before the great reconstruction. Finally, the conclusions state how the city them has changed around this core and how the current situation has so far.