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The Lynn pier parking complex consists of three floors, with the lowest one being flooded and infested with radroaches. Several eyebots, sentrybots, and possibly an assaultron patrol the area.
There is a Nuka Cola machine on the top level. In the lower level, what appears to be a storage room that is just under the ramp contains a red toolbox with various junk (typically duct tape, wrench, etc.) on a rusted shelf that is blocking the doorway. In the opposite end of the complex is a red truck that contains an ammo box with around 20 rounds of ammo (of various ammo types).
There is a bar in the middle of the road on the western side of the complex. Mac may be found here as a random encounter.
An Advanced locked safe is in the road just outside of the complex.
The Lynn pier parking only appears in Fallout 4.