Afetr clearing the "Boston Police Rationing Site" I crossed the bridge and found what appears to be a barn or maybe the warehouse mentioned in the holologs. It says that there is a key required to open it.

Does anyone know where the key is.

I know you can get in here using the Mass Pike Tunnel.

You can also get inthere by jumping and entering trough colapsed wall on top floor.(you need to jump on the forklift behind the barn, than onto the crate that forklift has liften in the air and than from the crate to the buildings side roof)

Thanks guys, but i have cleared "Mass Pike Tunnel" and gone in through the roof to enter first building with the mole rats.

When you exit that building turn left. You'll see another building across the bridge. This building has a BLUE door that requires a key. I am LVL 30 with Master Unlock and still I get that it needs a key to unlock it

Does anyone know where this key is or is it Quest related.