260/261 MADISON EQUITIES v. 260 OPERATING

Plaintiffs sue to rescind a stipulation entered into between plaintiff 260/261 Madison Equities and defendant in open court, which stipulation purported to settle the parties' dispute as to the amount of rent due defendant from plaintiff. The complaint, however, was properly dismissed since defendant satisfied its burden as summary judgment movant to demonstrate the absence of any factual issue as to the validity of the open court stipulation by making an adequate prima facie showing that the parties' stipulation was not, as alleged by plaintiffs, the product of mutual mistake, and plaintiffs failed to respond with evidence to the contrary. Indeed, the record discloses paintiffs' counsel admitted that he entered into the stipulation on his clients' behalf after reviewing the relevant documents, and discussing the situation with his clients. Even if he based his decision in part on an interpretation of the letter agreement provided by defendant's executive, any resulting misunderstanding as to the effect of the ensuing clear and unambiguous stipulation is not susceptible of characterization as the consequence of mutual mistake. Stipulations of settlement, especially those entered into in open court, will not be lightly cast aside (see, Weissman v. Bondy Schloss, 230 A.D.2d 465, 467, lv dismissed 91 N.Y.2d 887) and where, as here, a party seeks to set aside a stipulation on the ground of mutual mistake it bears the heavy burden of demonstrating that the parties to the challenged stipulation were indeed operating under a mutual misapprehension of fact at the time they entered into the stipulation and that the misapprehension was substantial (Matter of Gould v. Bd. of Educ., 81 N.Y.2d 446, 453; Vermilyea v. Vermilyea, 224 A.D.2d 759, 760-761). Here, plaintiffs failed to raise any triable issue of fact respecting the validity of the stipulation they seek to set aside (see,e.g., Clifton Country Rd. Assocs. v. Vinciguerra, 195 A.D.2d 895, 897,lv denied 82 N.Y.2d 664).

We have reviewed plaintiffs' remaining arguments and find them unavailing.