In a few years the view from the plaza would include the all glass 1 Dalton (am I getting that right?) tower so I bet they had that in mind when they designed this. Doesn't make it right that the design sucks from 2 sides but maybe it softens the blow.
I may be the minority but very dark to blue black glass to me is very welcomed because it just looks serious. Every time I am in Manhattan even the old boring boxy black glass towers just scream serious business occurs here and bring a no frills feeling of money and productivity. Too many blue glass buildings look too light and airy and I feel you need some anchor black glass to tie it together. Obviously this is not an office tower and it has silver accenting but I like that it brings some darker glass to the back bay to contract the majority blue and red palette that is common here.