Worcester is applying.
The mayor of Newton favors Worcester because having Amazon in Worcester would help bring about the E-W high speed rail wish.
http://www.masslive.com/news/index.ssf/2017/09/amazon_should_choose_worcester.html
Uh, Amazon won't be the one paying Seti. It's very much going to be a one way street.
Even in Boston, I am thinking the city/state is going to have to not only give the land away but build the HQ for them for for free (or something equivalent). And tax breaks. I think that's for starters what Amazon is going to want. Likely transit upgrades too on the state's dime.