14-9A. A QUESTION OF ETHICS: Mistake
(a) The court held that the contract was void due to mutual mistake and issued a judgment in
the defendant’s favor. The lower court determined, among other things, that a mutual mistake of fact
existed as to the divisibility of lot five—in other words, that the property was entitled to a free split.
BRJM appealed this ruling to a state intermediate appellate court, which reversed the lower
court’s judgment and remanded the case for a new trial. The appellate court explained that a mutual
mistake requires a mutual misunderstanding between the contracting parties as to a material fact and
“effects a result that neither intended.”
The court acknowledged that both parties were mistaken about the availability of a free split for
lot five. But the court reasoned that “this mistake was not material to their bargain. . . . [T]he necessity
of obtaining prior approval did not render the property incapable of being subdivided; rather, the only
Besides, “the fact that it was later determined that approval would be necessary in order to
subdivide the property adversely affected the plaintiff, as purchaser, not the defendant, as seller. The
defendant cannot seek to invalidate the agreement by asserting the defense of mutual mistake on this
basis because the defendant is not the party adversely affected by the mistake.”
(b) As noted in the answer to the previous question, the court held that the contract was
void due to mutual mistake and issued a judgment in the defendant’s favor. The court found in part the
existence of a mutual mistake in the parties’ reliance on an inaccurate appraisal that resulted in a below
market purchase price for the property.
On BRJM’s appeal, the state intermediate court reversed this judgment and remanded the case
for a new trial. The appellate court pointed out that “necessary for a finding of mutual mistake is that
both parties relied on the same mistaken information in entering into a contract.” In this case “the
mistake in establishing a below market purchase price for the property was a unilateral one made by
Engelsen, acting on behalf of the defendant, in reliance on the inaccurate appraisal.”