Create a Minecraft 1.21.1 schematic...

Create a Minecraft 1.21.1 schematic of one single modern warehouse building on a perfectly flat empty base with no terrain, no hills, no mountains, and no vegetation. Make it exact, clean, symmetrical, professional, and visually coherent. The building should look like a high-quality industrial storage warehouse, with a modern white futuristic style that matches reactor buildings. Keep it detailed but not cluttered, and make the shape realistic and easy to read.