The Revit shell rebuild for 301 W Osborn had stalled. Digging into why, we traced the model's recurring wrong dimensions back to their source.
Once we confirmed the model had been built against the wrong building's blueprints, I had us purge the source data entirely and rebuild the model's source of truth from the actual site photos and markups.
The recurring steel and thirty column framing came from reconciling against a 1971 plan set for 300 W Osborn, a different building across the street, not 301's actual concrete tower. No amount of further modeling was going to fix a foundation built on the wrong document.
We confirmed the mix up and purged it. Reconstructed the correct source of truth: a 26 column concrete tower measuring 151 feet 11 inches by 72 feet 3 inches. Then we pivoted from rebuilding in Revit from scratch to assembling from real architect CAD files that had existed the entire time.
When the numbers keep almost but not quite fitting, check whether you're even looking at the right building.
An honest, catchable error across two similarly located buildings, corrected the moment someone actually checked the source.