DECISION ORDER
ORDERED that the order is affirmed, with costs.
We affirm the order appealed from on a different ground than the one used by the Supreme Court in granting the petition and permanently staying the arbitration (see Menorah Nursing Home v. Zukov, 153 A.D.2d 13). The relevant provision of the subject insurance policy required that the appellant give written notice of an underinsured motorist claim "as soon as practicable." Thus, the appellant was required to provide timely written notice of the claim for underinsurance benefits as soon as practicable from the date he knew or should have known that the tortfeasor was underinsured (see State Farm Mut. Auto. Ins. Co. v. Sparacio, 297 A.D.2d 284, 285; Matter of Interboro Mut. Indem. Ins. Co. v. Callender, 288 A.D.2d 474; Matter of Eagle Ins. Co. v. Bernardine, 266 A.D.2d 543; Matter of Nationwide Ins. Co. v. Montopoli, 262 A.D.2d 647). The respondent specifically denied the receipt of any letter of notice of intent to file an underinsured claim dated October 4, 1999, which the appellant's attorney had purportedly mailed to the respondent. While a party is entitled to a rebuttable presumption of receipt based on proof of regular mailing, the respondent failed to submit sufficient evidence attesting to the mailing of the letter dated October 4, 1999, or to the existence of an office practice geared to ensure the proper addressing or mailing of this letter (see Nassau Ins. Co. v. Murray, 46 N.Y.2d 828, 829; Matter of Francis v. Wing, 263 A.D.2d 432; Azriliant v. Eagle Chase Assocs., 213 A.D.2d 573, 575; Matter of Colyar, 129 A.D.2d 946, 947). Accordingly, the respondent failed to establish that he provided timely written notice of the underinsured motorist claim, and the petition was properly granted.
RITTER, J.P., FEUERSTEIN, McGINITY, TOWNES and COZIER, JJ., concur.