Excellent addition.
I know the façade isn't the finished product yet, but as it stands now, THAT looks to be a fine, good looking building that respects the context of its neighborhood and street. Hopefully, the momentum can continue to fill in the surface lot gaps next to it as it moves towards Mass. Ave. That last triangular lot would make a nice, tall "The Point"-type building possibility.
Kudos the developer and architects on that one.