How Real Estate Brokerage Expert Witnesses Get Excluded Under Daubert — and How to Survive the Cross

Daubert is not a medicine problem. Under Kumho Tire and the 2023 amendment to Federal Rule of Evidence 702, the trial court's gatekeeping applies to every form of specialized testimony — real estate brokerage included. A 20-year study of 2,842 challenges to non-medical experts found that roughly half of those opinions were excluded or partially excluded, and the single most-cited reason was “unreliable methodology.”

The exclusion rarely happens in a written motion alone. It is built, piece by piece, in the deposition cross-examination — where opposing counsel walks a real estate brokerage expert into conceding scope, methodology, or an assumption that unravels the whole opinion. Here are the three traps, and how a prepared expert answers each one.

The three ways real estate brokerage experts lose ground

Scope: testifying outside your lane

The cross-examiner's question sounds simple:

You opine the agent breached their duty — but you weren't licensed in this state, were you?

Why it works: The state-license scope attack. Anchor to agency duties and the standard of care.

A stronger answer: “I apply the agency duties and brokerage standard of care, which are general to the practice, and the state's disclosure requirements, which I cited and am qualified to address.”

Methodology: the reliability attack

The cross-examiner's question sounds simple:

Your opinion relied on the transaction file — you didn't interview the parties, did you?

Why it works: Methodology / record basis.

A stronger answer: “I analyzed the documented conduct and disclosures against the standard, the proper basis, and noted that limit.”

Assumptions: the one premise that sinks the opinion

The cross-examiner's question sounds simple:

You assume the agent knew of the defect — but the file doesn't establish that, does it?

Why it works: The knowledge assumption. Tie to records.

A stronger answer: “Where the record didn't establish the agent's knowledge, I said so and analyzed the duty accordingly.”

How to prepare for the cross before you're sworn in

Every one of those traps is defeatable — but not by reading your report one more time. The experts who survive the cross have done three things:

• Rehearsed the cross-examination out loud, repeatedly, against a realistic examiner — so the scope concession, the methodology defense, and the assumption hedge are second nature.
• Mastered the record, so that when counsel asks them to recall the one line buried in thousands of pages of the transaction file, disclosures, and agreements, they can produce it in seconds rather than fumble.
• Stress-tested the report against FRE 702 — finding the reliability gaps before opposing counsel does.

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