Create a 3D low-poly modern city environment covering 600m x 600m with multiple buildings including apartments, office towers, cafes, shops, police station, hospital, and school. Include paved roads with sidewalks, streetlights, traffic signals, crosswalks, and parked vehicles. Buildings should be intact with clean textures, varied heights (3–10 stories), and real-world layout. Add trees, benches, and a central park area. Use PBR textures and realistic lighting. Export as FBX, optimized for Unity.