After the conclusion of a hearing but prior to the making of an order by the commission, a hearing may, upon petition and in the discretion of the administrative judge, be reopened for the presentation of new or additional evidence. Such petition to reopen the hearing shall state in detail the nature of the new or additional evidence, together with the reasons for the failure to submit such evidence prior to the conclusion of the hearing. The commission may upon its own motion and upon reasonable notice reopen a hearing for the presentation of new or additional evidence.
N.Y. Comp. Codes R. & Regs. Tit. 21 § 6.15