Doesn't your BIM application support exporting to common 3D file format (3ds, fbx, collada, ase, obj)? Which BIM app you want to use? I rendered a building from Revit in my DirectX app no problem, I just exported it from Revit as obj and loaded with Assimp.
I noticed you mentioned Revit in tags. If you worked with Revit you should know Jeremy Tammik's blog, here's a post on Revit 2014 obj exporting:
TasaqMember Since 05 Nov 2011
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