Marchiondo v. Scheck
Marchiondo v. Scheck, 78 N.M. 440 (1967).
Facts: Seller agreed to pay Plaintiff a percentage to sell a house, with the offer open for 6 days. On day 6, Defendant found another buyer and sold to him, while Plaintiff found a buyer that same day.
Issue: Can Defendant rescind the offer to Plaintiff?
Holding: No. Plaintiff had partially performed, which left the unilateral offer open for a reasonable time.
Rule: A unilateral offer must be left open for a reasonable time once offeree has begun performance.