The Lynn pier parking complex consists of three floors, with the lowest one being flooded and infested with radroaches. Several eyebots, sentry bots, and possibly an assaultron patrolling the area.
A Nuka-Cola vending machine can be found on the top level. In the lower level is what appears to be a storage room, located just under the ramp. It contains a toolbox with various junk on a rusted shelf blocking the doorway. In the opposite end of the complex is a red truck that contains an ammo box with ammunition of various types.
Lynn pier parking only appears in Fallout 4.