Ugh. There are architectural period contrasts that excel (Trinity Church vs 200 Clarendon) and then there's...this.
Given the context of this site and the perceived height restrictions given all of its neighbors, I would be more in favor of a "Disney building;" one that while brand new, was constructed with the intent to give the impression that it had "always been there" standing shoulder-to-shoulder with Fanueil Hall.
If you want to ratchet up the "authenticity factor," scour the region for reclaimed stone/brick from buildings that yielded to newer construction.
Just don't do.....this.