http://www.greatbuildings.com/types/mod ... odels.html
From the website:
I just fired up 3DExploration, and verified it can open these files.Hundreds of free 3D walkthough architectural computer models are included here at the Great Buildings Online web site, linked with free DesignWorkshop Lite architectural 3D walkthrough software for both Windows 95/98/ME/NT/2000 and Power Macintosh.
The models range in detail from very simple formal massing models of just a few blocks, through basic interior/exterior spatial walkthrough models, up to detailed interior/exterior models complete with furnishings and landscaping.
It's all free for your own personal architectural enjoyment, experience, and understanding.
So these can be converted to a format Ogre can use.
