Ordered that the order is affirmed insofar as appealed from, with costs.

The plaintiff Diane Zeolla (hereinafter the plaintiff) allegedly sustained personal injuries when she fell from a single-step riser at the Town of Stanford Courthouse. It is undisputed that, only minutes prior to the accident, the plaintiff had ascended the subject step without any problems. The plaintiff, and her husband suing derivatively, commenced this action, interposing causes of action alleging negligence and nuisance. Thereafter, the defendant moved for summary judgment dismissing the complaint. The Supreme Court granted the defendant's motion.

Contrary to the plaintiffs' contention, the defendant established its prima facie entitlement to judgment as a matter of law dismissing the first cause of action, which alleged negligence, by submitting evidence demonstrating that the condition of the single-step riser was open and obvious, and not inherently dangerous (see Kirk v Staples the Off. Superstore E., Inc., 123 A.D.3d 889, 890 [2014]; Losciuto v City Univ. of N.Y., 80 A.D.3d 576, 576-577 [2011]; Schwartz v Hersh, 50 A.D.3d 1011, 1011-1012 [2008]). In opposition, the plaintiffs failed to raise a triable issue of fact. The Supreme Court properly concluded that the affidavit of the plaintiffs' expert was speculative, conclusory, and insufficient to raise a triable issue of fact (see Reed v Nouveau El. Indus., Inc., 123 A.D.3d 1102, 1103 [2014]; Gold v Park Ave. Extended Care Ctr. Corp., 90 A.D.3d 833, 834 [2011]; Losciuto v City Univ. of N.Y., 80 AD3d at 577; Landy v. 6902 13th Ave. Realty Corp., 70 A.D.3d 649, 651 [2010]; Salerno v. Street Retail, Inc., 38 A.D.3d 515, 516 [2007]).

Accordingly, the Supreme Court properly granted that branch of the defendant's motion which was for summary judgment dismissing the first cause of action.