Use the uploaded daylight architecture image as the single source of truth. Lock the camera position, crop, building geometry, windows, facade materials, signs, street objects and all vegetation. Change only time of day and lighting to blue hour about 20 minutes after sunset. Create a deep but natural blue sky, warm 2700–3000K interior light visible through existing windows, subtle concealed facade lighting along existing architectural features and physically plausible reflections. Retain readable texture in shadows; protect highlights from clipping. For a Malaysia/Singapore setting keep tropical planting and humidity believable, without adding rain or changing pavement unless requested. Do not enlarge glazing, add openings, invent rooms, alter signage or add people. Preserve architectural verticals and material colors. Output one premium realistic architectural photograph without labels, logos added by the model or watermarks. Treat proposed lighting as a concept, not evidence of installed fixtures.