The improvement in the thermal and energy performance of an office building project, located in the city of Antofagasta, is analyzed, upon incorporating passive strategies oriented towards the thermal and light comfort in its design. A "base case" of the building was prepared and simulated for this, where climate-based design strategies were incorporated. The assessment is made on two of its floors: a compartmentalized floor, where the office with the most unfavorable orientation was analyzed, and an open-plan floor which was completely assessed. It was possible to determine through the simulation that the incorporation of passive strategies reduced the thermal discomfort period by an average of 80% versus the base case. In addition, on integrating the thermal comfort strategies with the natural lighting ones, energy demand was reduced by 90%. The criteria applied to the building's design will be presented, where the shape strategies, envelope optimization, solar control, ventilation and natural lighting are included, revealing how the building's final shape was nothing more than the result of the passive strategies integration process.