The first of a new generation, the Monge building stands out for the horizontal lines of the two parallelepipeds resting on a base that make up its structure. This evolution was driven by a focus on the comfort of the floors. The spaces are thus arranged into individual offices with natural lighting. In 1996, the curtain wall of the Monge building was completely renovated.

Before becoming an architect, Henri La Fonta first tried his hand at sculpture and painting. However, his training at the École Camondo led him to architecture. He gained his first experience in 1951 in Morocco as a collaborator, then returned to Paris in the 1960s. There, he worked for several design offices.

In 1977, he founded his own agency, which quickly made a name for itself thanks to the creativity and conceptual rigor he demonstrated in his work. In La Défense, Henri La Fonta was the main instigator of the office building revival in the 1980s. The business district owes him Les Miroirs as well as the Pascal and Voltaire towers.