I can't help but feeling that this is something of a lost opportunity. The site is so dramatic and so prominent, I really would have liked to see the corner emphasized more sharply. A true flat-iron building. The streetwalls would have been more dramatic from Brookline and Boylston, and the view from Longwood and from the refurbished Olmstead park would have been stunning. Instead what we are getting is basically a slab, which could have been built anywhere.
I realize that this had something to do with Trilogy and sight lines, but I'm not sure how they got enough clout to make demands. Still, even with that restriction, something could have been done. Make the building's "footprint" (3rd floor and up) a rhombus to the full height, tapering the Trilogy facing side to a point. Or include a series of setbacks on the east face. Something. I would just liked to have seen a much bolder presence along the two main streets.
I still think this could be gorgeous building and am looking forward to watching it rise, but I don't think they made very good use of the unique site.