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Ordered that the order is modified, on the law, by deleting the provision thereof granting the plaintiffs motion for summary judgment, and substituting therefor a provision denying that motion; as so modified, the order is affirmed, without costs or disbursements.
On this record, we discern unresolved material issues of fact as to whether the plaintiff exercised reasonable diligence in ascertaining the existence of coverage under the policy issued by the defendant carrier and whether it complied with those policy conditions applicable to additional insureds (see Greaves v Public Serv. Mut. Ins. Co., 4 AD2d 609, 613 [1957], affd 5 NY2d 120 [1959]; Seemann v Sterling Ins. Co., 267 AD2d 677 [1999]; cf. Nationwide Ins. Co. v Empire Ins. Group, 294 AD2d 546 [2002]; Winstead v Uniondale Union Free School Dist., 201 AD2d 721 [1994]). Accordingly, the Supreme Court erred in granting the plaintiffs motion for summary judgment.
The defendant’s remaining contentions are without merit. Mastro, J.E, Florio, Fisher and Dillon, JJ., concur.