DECISION ORDER
ORDERED that the order is affirmed, with costs.
The Supreme Court properly awarded summary judgment to the defendant. Pursuant to Town Law § 65-a(2), prior written notice is a condition precedent to maintaining an action against the defendant arising from a sidewalk defect (see, Amabile v. City of Buffalo, 93 N.Y.2d 471; Sloan v. Village of Hempstead, 223 A.D.2d 632; Strauss v. Town of Oyster Bay, 201 A.D.2d 553; West v. Village of Mamaroneck, 172 A.D.2d 827). In moving for summary judgment, the defendant met its initial burden of demonstrating that it had not received prior written notice of the alleged sidewalk defect. In opposition, the plaintiffs failed to raise a triable issue of fact with respect to their contention that written notice was not required because the defendant created the alleged defect by negligently constructing the sidewalk (see, Amabile v. City of Buffalo, supra; Sloan v. Village of Hempstead, supra; Strauss v. Town of Oyster Bay, supra; Gormley v. County of Nassau, 150 A.D.2d 342). The plaintiffs' unsubstantiated allegation that the defendant negligently constructed the sidewalk, made in the affirmation of their attorney, who had no personal knowledge of the facts, was insufficient to defeat the defendant's motion (see, Cattani v. Incorporated Vil. of Ocean Beach, 252 A.D.2d 533; Brooks v. Village of Babylon, 251 A.D.2d 526; Hirsch v. Morgan Stanley Co., 239 A.D.2d 466).