This will show you how to beat the 'Old Abandoned Warehouse' hope this helped :)
To get the Old Abandoned Warehouse key:
1. Go to Skyes Bar
2. Look for the yellow man (The Drunken Warehouse Bandit)
3. Click him
4. Click (Strength) " Lets take this outside "
6. Get reward and key
When your in the Warehouse:
1. Get 100hp
3. kill all punks SA style.
4. kick ass
5. get reward
6. Go to the police dept
7. Turn in coca
9. um thats about it i guess :)