make only the existing copper colored architectural elements significantly darker transforming their current bright copper tone into a deep rich dark chocolate brown metallic shade maintain the original metallic character with subtle satin reflections and a refined elegant appearance reduce orange red and bright copper undertones important do not change the material itself only darken its existing color all concrete elements must remain exactly as they are preserving their warm off white beige color and natural texture do not modify any other materials glass window frames lighting facade geometry or architectural details this is strictly a selective color adjustment of the existing copper elements not a redesign or overall color correction
