The Back Street Key is needed to get passage through one of the blocked area in the Shopping District.
The key is found in the Shopping District near the zombie corpse, which is located next to closed back door. When Ada tries to open this door with key, Ubistvo will appear and take out that key. Ada needs to defeat the monster to retrieve the key.
- ?, ed (2012). BIOHAZARD 6 Official Complete Guide. Famitsu.