Philadelphia, architectural exchange building, modern exterior, glass walls, steel beams, urban setting, cityscape, bustling streets, people walking, sunny day, warm light, slight shadows, detailed textures, reflective surfaces, geometric shapes, contemporary design, clean lines, minimal ornamentation, functional spaces, open floors, staircases, meeting rooms, collaboration areas, international flags, cultural exchange symbols, natural materials, wooden accents, metal railings, urban landscape, city hall, municipal building, civic center.