R.C. 5717.01 provides that when one takes an appeal from a board of revision to the BTA:
“Such appeal shall be taken by the filing of a notice of appeal, either in person or by certified mail, -with the board of tax appeals and with the county board of revision. * * * Upon receipt of such notice of appeal such county board of revision shall by certified mail notify all persons thereof who were parties to the proceeding before such county board of revision, and shall file proof of such notice with the board of tax appeals. The county board of revision shall thereupon certify to the board of tax appeals a transcript of the record of the proceedings of the county board of revision pertaining to the original complaint, and all evidence offered in connection therewith.”
The issue presented here is whether the statutory language in R.C. 5717.01 that a copy of the notice of appeal is to be filed with the board of revision is jurisdictional. Salem contends that procedural efficiency was substantially accomplished when it served a copy of the notice of appeal upon counsel for the BOR. We disagree.
*623In Austin Co. v. Cuyahoga Cty. Bd. of Revision (1989), 46 Ohio St.3d 192, 546 N.E.2d 404, a case factually similar to the present one, the taxpayers filed their notices of appeal with the BTA and, like the appellant in this case, failed to file copies of the notices with the board of revision. Within the thirty-day appeal period the BTA sent copies of its docketing letters to the Cuyahoga County Auditor, the Cuyahoga County Prosecutor and the Tax Commissioner’s tax equalization division. Despite the lack of the filing, the board of revision in Austin, as did the BOR in this case, filed statutory transcripts with the BTA but noted the lack of filing of the notices of appeal.
We affirmed the BTA’s dismissal in Austin because “timely filing a copy of the notice of appeal with the board provides that agency with the statutory notice of appeal.” Id. at 194, 546 N.E.2d at 406. According to R.C. 5717.01, after receipt of this notice the board must notify all parties of the appeal and transmit to the BTA a transcript of the board’s proceedings, including all evidence reviewed by the board. Thus under Akron Std. Div. v. Lindley (1984), 11 Ohio St.3d 10, 11 OBR 9, 462 N.E.2d 419, the filing requirement runs to the core of procedural efficiency and is essential to the proceeding. Salem has not substantially complied with the statute. Moreover, we stated in Austin that the “BTA’s docketing letters do not replace appellants’ duty to file their notices of appeal with the board.” Id. at 194, 546 N.E.2d at 406.
Salem argues that delivering a copy of the notice of appeal to the assistant prosecutor satisfies the filing requirement. Filing a copy of the notice of appeal with the board of revision is, however, a different requirement from serving a copy of pleadings upon the board’s attorney after litigation has begun at the BTA. R.C. 5715.44 provides that the county prosecutor is to act as counsel for the board of revision in defending any proceedings in any court in which the board of revision is a party. However, neither R.C. 5715.44 nor R.C. 5717.01 authorizes an appealing party to serve, or the prosecuting attorney to accept, a copy of a notice of appeal in lieu of filing with the board of revision.
Salem also contends that Civ.R. 5 and S.Ct.Prac.R. XIV(2) support its position that a copy of its notice of appeal may be filed with counsel for the board of revision rather than with the board of revision itself. We disagree.
Salem’s contention ignores the dual status of a board of revision in an appeal to the BTA, where the board is both the deciding tribunal whose decision is being appealed and the party appellee. R.R.Z. Assoc, v. Cuyahoga Cty. Bd. of Revision (1988), 38 Ohio St.3d 198, 527 N.E.2d 874. The need for service upon counsel for the board of revision arises only after there has been a proper filing of the notice of appeal with the board of revision and the BTA.
*624Finally, Salem contends that because the BOR did not maintain a separate office, its filing of the notice of appeal with the assistant county prosecutor was appropriate. Again we disagree.
If there was no separately maintained office for the board of revision, then Salem could have filed its notice of appeal with the auditor. R.C. 5715.09 provides that the county auditor is the secretary of the board of revision and “shall * * * keep an accurate record of the proceedings of the board * * * and perform such other duties as are incidental to the position.” See Phoenix Dye Works v. Cuyahoga Cty. Bd. of Revision (Sept. 6, 1985), BTA No. 84-D-660, unreported.
For all the foregoing reasons, we affirm the decision of the BTA because it is reasonable and lawful.
Decision affirmed.
Moyer, C.J., Douglas, Resnick, F.E. Sweeney, Pfeifer, Cook and Lundberg Stratton, JJ., concur.