Gibbons v. Ludlow, 304 P.3d 239

Sellers entered an exclusive listing with Gibbons-White for ~181 acres of vacant land in Boulder County.
Actis offered to buy 49.2 acres with an infrastructure credit and a contract that could terminate if a reimbursement agreement wasn’t escrowed; the credit would reduce the purchase price at closing.
Sellers rejected Actis’s offer but accepted a counteroffer reducing acreage to 44.3 acres with a price of $5,790,822.60 and later contracted for an additional 4.98 acres; total listed price was $6,550,073.40.
Brents Wilson (broker) and Cameron Grant (attorney) represented the Sellers; neither informed them the infrastructure credit provisions existed in the Actis contracts.
Sellers closed despite learning at draft settlement that Actis would receive a $1,615,909.95 credit; they sued brokers and lawyers for professional negligence and related claims.
Trial court granted summary judgment to brokers; court of appeals reversed; this Court granted certiorari to address causation/damages in transactional broker malpractice.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Causation framework for transactional broker malpractice	Sellers would have obtained a better deal or would have walked away if informed.	No proof of a better deal or no-deal path; damages speculative.	To prove causation, plaintiff must show better deal or no deal; here not shown; summary judgment affirmed on professional negligence.
Proof of damages for causation in broker malpractice	Evidence like appraisals and prior deals show loss.	Damages are speculative without demonstrated sale at $6.6M or comparable evidence.	Damages must be proven beyond mere speculation; plaintiffs failed to prove lost profits or other damages causally linked to negligence.

Bebo Const. Co. v. Mattox & O'Brien, P.C., 990 P.2d 78 (Colo. 1999) (case-within-a-case framework for causation in legal malpractice)
Bristol Co. v. Osman, 190 P.3d 752 (Colo. App. 2007) (case-within-case framework applied to professional negligence)
Roberts v. Holland & Hart, 857 P.2d 492 (Colo. App. 1998) (lost profits proof standards in professional negligence)
Vanderbeek v. Vernon Corp., 50 P.3d 866 (Colo. 2002) (damages for speculative future profits not recoverable)
Allen v. Martin, 203 P.3d 546 (Colo. App. 2008) (causation questions in professional negligence when facts undisputed)
Kaiser Found. Health Plan of Colo. v. Sharp, 741 P.2d 714 (Colo. 1987) (preponderance standard for causation in negligent conduct cases)
Roberts v. Holland & Hart, 857 P.2d 492 (Colo. App. 1998) (damages must be proven; speculative evidence insufficient)