Four Leaf Fishpacking Plant

There are modified tripwires here that you can’t disarm since these are part of the quest "Diamond City Blues". On the rooftop, you'll find more ghouls and a generator with a fusion core. The terminal here will open the chem lab related to the quest but only if you have the password.

After entering from the ground entrance, from the door, go upstairs to the NE to find a generator with a Fusion Core and Expert Safe.

To the NW, there’s a security gate that can be opened by the nearby Novice terminal. You can use it to activate the building’s protectron as well. There’s a fusion core on the shelf beside the protectron as well.

Go downstairs to find an Advanced Security gate to the NE. The red steamer trunk and an issue of the Tales of a Junktown Jerky Vendor are found in the locker room in the lower floor to the SW.