An old town hall becomes a new town hall. However the unity of the façade is actually the result of improbability of the ruin. What the building really was. New structure of tables comes in the house. And for every leg the sizing is needed. Not more and less. Underneath the roof the eventual space. Therefore triangle cuts are good enough. And at the back a mere arrangement of stairs and elevators at the places where it is needed. A couple more spaces. Three principles. Enough principles.