Building address
If the deliverable named a plan, enter it. Matching plans are scored first and flagged as the given plan. The automatic shape match still runs alongside as a cross-check, so a mislabeled plan never hides the real match.
Or: compare an on-site floor plan photo
Snap a photo of a posted floor plan or fire-escape / evacuation map inside the building, and match it against the library. This compares plan-to-plan (usually a stronger signal than the satellite roof). No address needed.