"In bed with city hall" means they own the mayor, not vice versa.
I don’t believe it works that way in Boston. There are a number of developers who have found that out the hard way. The big dig and the development of the harbor - they’re littered with bodies.
Yes, in other cities they may ‘own the mayor’ but not all. Some cities it is about money. Other cities, it’s about who you are, history and power.