37 N.Y.2d 162 (1975)
Parties to a civil litigation may consent, formally or by their conduct, to the law to be applied, and an agreement on a theory of damages at trial, even if implied, controls on appeal.
Summary
This case addresses whether a party can challenge a legal theory on appeal after implicitly consenting to its use during trial. The plaintiff, by their conduct at trial, consented to the jury’s consideration of the defendant’s hypothetical rental value as a valid measure of damages for wrongfully withheld use and occupancy. The New York Court of Appeals held that because the plaintiff consented to this theory at trial, they were precluded from arguing on appeal that the theory was not legally sound. The court modified the Appellate Division’s order to reinstate the original judgment.
Facts
The specific facts underlying the dispute regarding use and occupancy are not detailed in this memorandum opinion. The key fact is that during the trial, the defendant presented a hypothetical rental value as a way to calculate damages. The plaintiff, through their conduct, did not object to this method and allowed the jury to consider it.
Procedural History
The case originated in a lower court, where a judgment was awarded to the defendant based, in part, on the hypothetical rental value theory for damages. The Appellate Division subsequently reviewed the case and modified the judgment, seemingly rejecting the hypothetical rental value theory. The New York Court of Appeals then reviewed the Appellate Division’s decision.
Issue(s)
Whether a party who implicitly consents to a particular legal theory or method of calculating damages during a trial can challenge that theory on appeal.
Holding
Yes, because parties to a civil litigation may consent to the law applied, and an agreement on a theory of damages at trial, even if only implied, controls on appeal.
Court’s Reasoning
The Court of Appeals relied on the principle that parties can consent to the law applied in their case, as stated in Martin v. City of Cohoes and T. W. Oil v. Consolidated Edison Co.. The court stated, “parties to a civil litigation, in the absence of a strong countervailing public policy, may consent, formally or by their conduct, to the law to be applied.” It further emphasized that “an agreement on a theory of damages at trial, even if only implied, must control on appeal.” Because the plaintiff’s conduct at trial indicated consent to the jury considering the defendant’s hypothetical rental value for calculating damages, the plaintiff could not later argue on appeal that this theory was invalid. The court found that the Appellate Division erred by setting aside the verdict based on the plaintiff’s later-proffered rationale. This decision underscores the importance of objecting to legal theories and methods during trial to preserve the right to challenge them on appeal.