A few weeks ago, I came across I found this, the Boston Redevelopment Authority Digital 3D Models website. I looked at it briefly, saw that they were providing 2D CAD, 3DS and VIZ files for most areas in Boston, and then I moved on.
This morning, I was reorganizing my weblinks in FireFox and looked at the site more carefully. At the very bottom of the site are 4 links, which are the most interesting part of the page. There are 3D massing models of Downtown Boston, the South End & Longwood Medical Area, available for download in DWF format.
Even better, the BRA offers their "Digital 3D Model Submission Guidelines". Although they aren't asking for an intelligent BIM, it is certainly a step in the right direction.