... white frame clashes with every other color and that is magnified by the glass. The whole structure - its axis, color, shape, everything - totally clashes with the other buildings. The orientation is what I have the biggest problem with - it's out of line with the crescents, AND with City Hall... so it basically dooms the entire plaza to ever having any coherence at all.
Another typical Boston, Mass. move - they coulda had a clear, long range plan for fixing govt center with design principles, long term goals, and made sure any new construction was in line with this - instead, the T does its own thing.