Modern architectural firm, Chicago, Willis Tower, skyscraper, glass, steel, concrete, urban, cityscape, busy street, cars, pedestrians, cloudy sky, afternoon sunlight, reflective windows, sleek lines, geometric shapes, minimalist interior, wooden desks, ergonomic chairs, large screens, 3D models, blueprints, architects, engineers, designers, laptops, coffee cups, water bottles, creative workspace, collaborative atmosphere, natural light, panoramic view, city skyline.