Questrom was peak Silber reactionary, a gigantic historicist brick wart. From the Cambridge side of the Charles it is overwhelming in size. There could be some moderating of the tower cantilevers so they jut out a bit less but something bold like this will take a lot of the sting out of Questrom.
Questrom is astonishing in it's hugeness. I can only imagine how awful the interior spaces are. It would be funny if it weren't a real thing. And Silber was probably very proud.
And I can imagine a cantilevering tower where the cantilevers vary to accommodate views or program that could be really interesting--and how the facade is designed could be great. If they (read: Brown) are open to critique and improvement this could be amazing.