In an action for specific performance of a contract for the sale of real property, the plaintiffs appeal from an order and judgment (one paper) of the Supreme Court, Suffolk County (Tanenbaum, J.), entered July 21, 1988, which granted the defendant’s motion for summary judgment dismissing the complaint, and denied the plaintiffs’ cross motion for summary judgment.
Ordered that the order and judgment is affirmed, with costs.
On May 15, 1985, the defendant seller and the plaintiff purchasers entered into a contract for the sale of a house for a total purchase price of $80,000. At that time the plaintiffs
The defendant’s attorney orally agreed to extend the plaintiff’s time to obtain a mortgage commitment up to and including September 13, 1985. On October 10, 1985, the plaintiffs orally requested that the defendant provide a certificate of occupancy. By letter dated October 28, 1985, the seller canceled the contract.
We find that the purchasers failed to obtain a mortgage commitment by the September 13,1985, deadline and thus the defendant had a right to unilaterally cancel the contract (see, Ferlita v Guarneri, 136 AD2d 680; Grossman v Perlman, 132 AD2d 522, 523). The issue of a purported second extension to November 30, 1985, is not properly before this court, as it was not raised in the Supreme Court and was not raised on appeal until the submission of the plaintiffs’ reply brief (see, Matter of Schiavone Constr. Co. v Larocca, 117 AD2d 440, 444; see also, Lundin Co. v Board of Educ., 68 AD2d 881).
We further find that the defendant, as a matter of law, was obligated to deliver the certificate of occupancy only at the time of closing (see, Eastern Shopping Centers v Trenholm Motels, 33 AD2d 930). The record clearly reflects that the plaintiffs authored paragraph 12 of the rider to the contract. Since the plaintiffs failed to include in the paragraph a clause requiring the production of a certificate of occupancy prior to closing, paragraph 12 should be construed against the plaintiffs. In any event, if the defendant was required to deliver the certificate of occupancy on demand, the defendant was entitled to reasonable notice of the demand (see, Levant Am. Commercial Co. v Wells & Co., 186 App Div 497), which, as a matter of law, was not provided here.