D525 Barcelona was designed through the concept of SUSTAINABLE RENOVATION, relying in 5 axes: NATURAL LIGHT & PURE AIR through the main façade´s large windows, defined by photocatalytic krion 3D modules that purify air. ECO-EFFICIENT & CLEAN ENERGY through the south façade´s photovoltaic louvers. GREEN & NATIVE PLANT SPECIES are integrated in the roof to provide an extra insulation layer and mitigate the heat island effect. SUSTAINABILITY & BUILDING SKIN. A detailed study of the environment was made to design the project´s skin, improving its energy efficiency. DEVELOPED & COORDINATED IN BIM