Source traceability is what turns AI real estate underwriting from a fast answer into reviewable work. A number without its source, period, unit, and transformation may be directionally useful, but it cannot reliably survive model review or investment committee scrutiny.
A citation is the beginning of the receipt
A page reference helps, but a complete receipt also includes the source file, table or row context, reporting period, unit, sign, and any transformation applied before the value reached the model. Those details explain what the number means, not just where the text appeared.
For spreadsheets, the relevant source may be a sheet and cell range. For a rent roll, it may be the unit rows behind an aggregate. For research, it should include the publisher and observation date.
Keep facts, estimates, and assumptions distinct
Historical rent from a lease schedule, modeled market rent, and a firm-approved rent-growth assumption are different categories. A system should never make them look interchangeable simply because all three are numbers in a workbook.
- Sourced historical fact
- Derived value with visible calculation
- Modeled estimate with stated method
- Forward assumption with reasoning
- Unknown or unresolved conflict
Use provenance to resolve conflicts
When the OM, rent roll, and T12 disagree, provenance gives the reviewer enough context to classify the gap. The most recent source is not automatically authoritative, and the seller’s summary is not automatically wrong. Time frame, scope, and definition determine the treatment.
Preserving both candidates prevents silent overwrites and creates a diligence question. Once the team resolves it, the decision and evidence can remain attached to the deal record.
Receipts create institutional memory
Months after a deal closes or dies, teams often remember the conclusion but not the evidence behind it. A source-connected record preserves why an assumption was accepted, why a deal was rejected, and which facts changed during diligence.
That record improves future judgment only if it is honest. Traceability should make uncertainty visible, not decorate a confident answer with a citation that does not actually support the claim.
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