Even in light of the arguments raised and evidence submitted inappropriately for the first time in reply ( see Azzopardi v American Blower Corp., 192 AD2d 453, 454), defendant failed to meet its burden to show prima facie that plaintiffs cause of action has no merit. In support of its argument that there was no dangerous condition on the exterior staircase on which plaintiff fell, allegedly because of a pooling of water on a cracked step, defendant relied exclusively upon the opinion of an expert who measured the coefficient of friction of the stairs when they were dry and conceded that there is no available test to measure the friction of wet surfaces ( see Pomahac v TrizecHahn 1065 Ave. of Ams., LLC, 65 AD3d 462, 466; Styles v General Motors Corp., 20 AD3d 338, 339).
In any event, plaintiffs expert offered opinions that conflict with those of defendant's experts, thereby precluding summary judgment.