Modern architectural building, sleek lines, minimalist style, clean shapes, symmetry, balance, emphasis, harmony, contrast, unity, variety, hierarchy, proximity, alignment, repetition, color scheme, monochromatic, analogous, triadic, texture, material, glass, steel, concrete, wood, natural light, artificial light, shadows, reflections, interior design, exterior design, urban planning, cityscape, metropolitan area, skyscraper, office building, commercial complex, mixed-use development, green architecture, sustainable design.