We started the project with several goals: We wanted to create open office spaces, free of structural elements, which allow the users to adapt the space perfectly to their needs. Given the good climate of the city of Guadalajara, it was very important for us to offer well-ventilated offices without the need of air conditioning and spaces well illuminated with natural light. We wanted to design a singular building which could represent the client's expectations. The location of the building demanded a bigger building than those we normally find in densely-populated European cities, so we wanted to highlight its monumental character. The building opens up to the environment and the city, expanding towards the city and at the same time, offering itself to it. We opted for a high-rise building which was developed starting from three central concrete cores which contain all the facilities and vertical circulations. These cores work as pillars and are the only structural support for the building. Large cantilevered beams of various dimensions support post-stressed, column-free slabs. Thus both, the office modules and the parking area, are free from obstacles. The centre of the building –the area between the three cores– is an exterior space which is opened up sideways by huge voids: removing three floors of the office-modules on each side lights the central space and allows the cross-ventilation. The generated voids house covered terraces which the users can enjoy for outdoor activities. Externally, a skin of wood louvers mounted on sliding panels acts as sunblinds; vertical airflow is permitted while the heating-up of the glass is prevented.