This intervention is based on the pre-existence of a building on the plot and, taking partial advantage of its structure and foundations, generates a large platform on which a new, more efficient, representative and functional building rests. The demolition of the upper section of the original building allows for unconstrained growth from the first floor up, generating a reception area as a loggia with a large porticoed area. On this base plinth, five floors are added with peripheral work areas and a central core with a new distribution of services and vertical circulation. On both sides of the core, two courtyards provide additional lighting in work areas. The definition of a peripheral structural line in coordination with the façade and the use of post-tensioned slabs, allows for a functional scheme of open floor plan in the work spaces, providing functional versatility.The facade is modular and prefabricated and is defined by structural elements that adapt to the different solar orientations, optimizing its overall energy performance and the degree of comfort required for every space of the building.