Thank you for the responses so far . . .
JC - I have never used ReduceMesh, but I still want the geometry there in Rhino. I have several iterations of parts to build over the STP geometry. is ReduceMesh for rendering or still working on the file?
Skyg - I have already done the arduous task of separating it all into layers, for sure, noted for next time . . .
Pascal - It came in several block instances and polysurfaces. I exploded the Blocks and sorted through all the surfaces to work them back into polysurface parts or grouped surfaces that didn’t want to join. that’s how I got to where i’m at and when I saved - 420mb. chug chug chug . . .
So is ReduceMesh my best bet from here? do I select specific parts and use that command specifically on them individually? any other ideas?
Thank you all!