I looked at your file. The Plan Display Representation, which is active for the Top view direction in the Medium Detail Display Configuration, did not have the custom blocks attached; only the Model Display Representation did.
I edited the Hollow Square Column Style Structural Member Style. On the Display Properties tab, I then edited the Model Display Representation Style Override, and, on the Other tab, verified that the Automatically Apply to Other Display Representations and Automatically Apply to Object Overrides were toggles checked. I then selected OK, and the custom blocks that were attached to the Model Display Representation were copied to the Plan Representation. I edited the Plan Display Representation Style Override to verify this. I then selected OK twice to get back to the drawing.
Your Column Bottom Block-Used custom block is now visible in a plan view. You may want to consider creating a simpler, 2D block with just the linework you want to see in a typical plan view and using that block in lieu of the the 3D block in the Plan Display Representation. Or, maybe the 3D block provides exactly what you want, and you can leave it at that.
David Koch
AutoCAD Architecture and Revit User
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