In order to obtain a review by the IBTR, the party must, not later than forty-five (45) days after the date the PTABOA gives notice of the determination:
(1) file a petition for review with the IBTR; and
(2) mail a copy of the petition to the other party.
See Ind. Code § 6-1.1-15-3(d) and the IBTR website at https://www.in.gov/ibtr/