Not a prefab, but maybe I'll make one in a prefab style. Here's a Weazel-Mart a building that I've always tried to build in multiplayer servers once I start hitting the end-game or boredom.
1. Maintenance room with ladder access to the roof.
2. Outside Weazel-Mart. With stairs and handicap ramp access. Cart corrals on either side.
3. Entering Weazel-Mart. To the left is the maintenance room, restrooms, book store, and tool store.
4. Restrooms. The left is men, and the right is women.
5. The bookstore.
6. Tool store.
7. Weapons stall is still yet to be decorated.
8. The meds stall is still yet to be decorated.
9. Armor and clothing store. Also still yet to be decorated.
10. Food court right before you exit...