Ключевые слова: activity, architecture, big, building, business, center, city, clear, construction, design, downtown, economy, estate, facade, finance, frankfurt, futuristic, glass, hauptwache, large, light, modern, modern window, offices, opera house, panorama, perspective, place, reflection, roof, scene, shadow, sky, skyscraper, steel, street, structure, sunset, tall, technology, tower, towers, town, urban, window,