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The construction site is located west of Bunker Hill, southeast of the Mass Chemical building. It contains a small area with a weapons workbench on the west side and an unfinished building in the center. The building consists of 3 finished floors with a few rooms and several unfinished levels. The very top of these levels has a platform that connects to the nearby broken section of the freeway. A machine gun turret is located just inside the main entrance. On various floors one can find crude bridges to neighboring buildings, including the overpass. A weapons workbench is located on the fourth floor. A steamer trunk is located near the top. Dropping down the elevator shaft lands you in a partially flooded area containing a steamer trunk.
The next building westward contains another weapons workbench.
On the broken section of the overpass accessed near the top is a toppled trailer to the north with a locked trailer door (Master lock). This contains a steamer trunk with minor loot located at the front. To the south end is a construction lift which ascends to the top tier of the overpass and another lift further south (though there is nothing of value there). It is possible to jump to the next section of the road and continue past this lift and arrive above the garden terrace. At the ending path it is possible to descend some stairs and continue over a walkway to a door into the Commonwealth Bank.
Construction site warehouseEdit
Just north is a warehouse with its own interior. Inside is very small with a couple of meat bags and a catwalk. Also present are super mutants (and/or raiders depending on difficulty).
The Cambridge construction site only appears in Fallout 4.