Simple horizontal and vertical lines, emphasizing the regular rhythm of columns without structural changes.Rectangular openings aligned with columns and existing floors.Minimal ornamentation, a clean and orderly facade framing.Color Palette:Light concrete or soft gray as the main color for facade and columns.Matte white or creamy white for the background walls.Window frames in black matte composite aluminum panels or anodized aluminum frames.Recommended Facade Elements:Floor-to-ceiling windows with slim black frames at each main opening.Thin horizontal strips of aluminum composite or porcelain ceramic between floors for visual separation.Small glass balconies with semi-frosted glass railings to maintain minimalism.Exposed concrete or smooth cement facade with waterproof coating for harmony with columns.Optional warm accent element (e.g., thermo wood strip) limited to 1 or 2 panels for visual emphasis.Geometry and Openings:Openings precisely spaced between columns; no structural changes to columns.Height of the new fourth floor aligned with existing floors; vertical windows aligned with lower floors.If a small terrace on the new floor is desired, use a lightweight cantilever beam (structural approval required).Facade Lighting:Warm linear LED strip lighting under the horizontal band between floors.Small recessed lights at terrace floor or near openings for evening effect.Execution and Safety Notes:Structural engineer's calculations are mandatory for the additional floor's load See more