The project is based on the concept of the Urban Cell, which is a scale between architecture and urbanism that embraces a mixed-use project composed by four buildings. The approach of the project on this scale comprehensively tackle a number of key design issues related to urban space, green space, accessibility, orientation of buildings, a mix of uses and energy efficiency, among others. The design approach of all four buildings is environmentally sensitive and bioclimatic, and the strategy was to specialise each buildings situation seizing its assets to work synergistically to the whole. Thus, this design was conceived and developed taking into account a series of linked buildings and urban spaces. The curved façade is made up of a skin composed of more than 2,000 triangular pixels which change by means of a parametric design from: opaque, translucent and transparent, depending on their orientation, the incident to solar radiation, the access to external views and the privacy of the rooms. More than 1,000 polycrystalline photovoltaic modules are integrated on the inclined rooftop of the Zero building that will have an annual electricity output similar to the electricity consumption of 100 average flats. The interior of the building recreates different working environments from desks and closed meeting rooms to a series of lounge spaces suitable for informal meetings and personal work. These designs have the ability to imprint a special character to the working spaces and also seek to evolve the brand culture of the company among the employees.