I agree, this is the best design we have seen from Heller Manus yet. They continue to improve.
I also hope that this "Preferred" version is the one that gets built.
From:
http://www.sfgov.org/site/uploadedfi...ngton_DEIR.pdf
Not only do I think of the HSB Turning Torso, but I also think of the Leaning Tower of Pisa when I see this design.