Lovejoy Wharf
Truly the most positive development in Boston for so many reasons -not just for its own aesthetics, but it improves its environs on so many levels at the human street level, sense of place and then aesthetic. They took a garbage dump area and transformed it into a valued team player. I actually think the magnificent boardwalk (not even the building) is its best feature.
I love MassArt Treehouse as a stand alone building, it's great and Boston needs more of it. However, I love Lovejoy Wharf for its multilevel effect on its part of the city, without screaming "look at me!".