The potential interest of this project lay in how it responded to two very delicate and controversial demands. The first one concerned our collaboration, as designers, with Núñez y Navarro, a real estate developer that, having hardly needed architects before, had reached a leading position in our city. Our persuasive skills, enthusiasm, and also our ability to engage in dialogue had to redirect a way of doing things that had proven to be commercially successful. The second involved adhering to the strict protection regulations of the Eixample. The site was located within the total protection area, and the program required the construction of office spaces. The developers doubted the feasibility of building modern, efficient offices when the curtain wall façade was strictly prohibited from the outset. The Eixample protection regulations were being heavily questioned by authoritative voices, but we believed it was possible to build a technologically impeccable building that expressed its function without disguising itself as a residential building, and that not only complied with legal requirements, but also truly integrated with dignity into that exceptional environment. A historic part of the city. Strict regulations aimed at preserving its character. An adjacent building of great dignity. A narrow plot where everything was façade. The Arc de Triomf from the 1888 Universal Exposition facing it. A successful developer who had almost never worked with external architects... The building aimed to provide a respectful response to all these constraints.