photorealistic architectural render metropolis building evry courcouronnes outdoor staircase enclosure wrapped in authentic weathering steel corten deep brown rust oxidized patina with natural color variation dark brown burnt sienna amber fine geometric diamond mesh perforated steel panels small repetitive pattern high transparency through perforations revealing interior staircase clearly strong vertical steel frame columns defining panel grid raw industrial texture aged oxidized metal surface staircase descending continuously from level 2 to ground level rdc open entrance at street level attached to brutalist concrete structure photographic realism natural daylight blue sky street perspective 8k
