Took me a little while to realize it (and I even searched to see if anyone brought this up first), but Fairhaven, at least the downtown area is based on Boston.
The tower from 75 State Street is there, Quincy Market, City Hall and its Plaza, the greenway above I-92 (I-93 in real life), the cable-stayed bridge as well as a few other buildings in that area are landmarks of Boston. Heading west of City Hall (by the "Emmerson Beltway" race), on the left there's a building with the archway (the one with a billboard), and across the greenway is a building with a cone shape on the top (also a real building), and just past that is Quincy Market. Even Tremont Street in some way seems represented behind City Hall.
Boston locals tell me if I'm wrong.