Paul McMorrow had a recent article that criticized Boston City Hall and proposed (as have many other people) that it be sold to a developer. Predictably, the Globe published a few letters from defenders and apologists for the building.
Ultimately, the building and the plaza are doomed. Boston property is coming of age in value and no mayor has a political stake in the preservation of the building. The re-development will proceed like an opera, but the end result will be some form of improvement to public space and steep profits for a chosen few.
I think this image is model of one of the losing entries in the original design competition.