I have a 3D meshes of buildings in a Rhino file that can be exported as a .obj or .fbx and want to use the fanout expression to put each building into an individual file/folder. The exported file (both .obj and .fbx) dont have any attributes and is read as one cohesive mesh so I am unable to assign any attributes to them to split up.
How would I go about this workflow?

I used a Counter to assign a unique id to each face so the network ID can be merged from the decomposed lines back to the original faces. A partial workspace is attached.