Final answer:
To prove mutual mistake, certain elements must be present, including a material mistake of fact made by both parties. Jack Kelly's case fulfills these elements because of the mistaken belief about the intended use of the rented premises.
Step-by-step explanation:
To prove mutual mistake, the following elements must be present: (1) There must be a material mistake of fact made by both parties; (2) The mistake must relate to a basic assumption of the contract; (3) The mistake must have a material effect on the agreed-upon exchange; and (4) The party seeking rescission must not bear the risk of the mistake.
In Jack Kelly's case, it fulfills these elements because both parties mistakenly believed that the rented premises could be used for an executive recruiting firm, when in fact the certificate of occupancy stated that it could only be used for residential purposes. This mistake was material to the agreement and had a material effect on the intended use of the space.