abandoned apartment building 3d model

Large realistic abandoned post-apocalyptic apartment building, full-scale explorable game environment, NOT a miniature. IMPORTANT: do not create one combined mesh. Create separate modular objects: exterior walls, interior walls, floors, ceilings, doors, windows, stairs, roof, damaged wall sections and debris. Keep all architectural parts separate and reusable with consistent grid dimensions for Unity. Multi-story building with accessible interior, rooms, corridors, apartments and staircases connecting all floors. Player can enter from outside and explore every floor. Interior must not be empty. Heavily damaged concrete, cracked walls, broken windows, exposed bricks, rubble, dust and overgrown vegetation. Realistic proportions, optimized game-ready geometry, clean topology, no people or vehicles.