Its not always easy to say when the last date upon which an attorney renders service to a client, nor when the statute of limitations commences. . is it on the day that a defective security agreement is prepared? is it on the day that the security agreement is given to debtor? In this case, its no earlier than the day when the last signature is executed.

Americana Capital Corp. v Nardella 2012 NY Slip Op 04927, Appellate Division, First Department determines the date upon which a malpractice claim arose.
 

"Plaintiff’s legal malpractice claim was not barred by the statute of limitations (see CPLR 214[6]). Plaintiff alleges that the deceased negligently drafted a security agreement preventing plaintiff, as the creditor, from being able to enforce the agreement as against the debtor once the debtor defaulted.

Plaintiff’s legal malpractice claim accrued no earlier than when the agreement was executed, which occurred on November 29,
2002, the date of the last signature on the agreement (see McCoy v Feinman, 99 NY2d 295 [2002]), and this action was commenced less than three years later. "