We were in front of a complex urban situation: we had to build a market hall in a central square of the city, the centre of which was occupied by the former City Hall of the district(building of the early 30s well enough preserved) meanwhile relocated, surrounded with moderate incoming buildings of the 50s. A Theatre for children is accommodated in one of its wings. Some villas dating the beginning of the XXth century are today, a proof of the savoir-vivre in the city, before war. We buried the market on a side of the square enlightened by glass blocks immersed in a pond which serves as a strong compositional element. On the opposite side a shopping mall (also serving as entrance to the buried market) continue and close the cornice of the square. Three other places so result: the place of the flying market, a garden on the opposite side, and the place of the theatre, which ground is in paving stones of red concrete forming the "open air lobby". The building of the former City Hall is so transformed in a pivot articulating all the four places, each with a different personality.