Petitioner seeks review of an order of the Land Usé Board of Appeals (LUBA) which dismissed its petition for review of a land use decision made by the Multnomah County Board of Commissioners (Board). LUBA decided that petitioner’s notice of intent to appeal was not timely filed. We affirm that decision.
Respondent Greater Portland Broadcasting Corp. applied to the Multnomah County Planning Commission for a community service designation for a parcel of property on which it desired to construct a television transmission tower. The planning commission’s approval of this designation was appealed to the Board. The Board approved the designation at a meeting on February 14, 1984, and the order approving the designation was signed by a commissioner after the meeting and delivered to the clerk of the Board on the same day.
Petitioner filed a notice of intent to appeal the Board’s decision to LUBA on March 9,1984. ORS 197.830(7) provides:
“A notice of intent to appeal a land use decision shall be filed not later than 21 days after the date the decision sought to be reviewed becomes final.”
LUBA has promulgated a rule, OAR 661-10-010(3), which defines “final decision or determination” as “a decision or determination which has been reduced to writing and which bears the nécessary signatures of the governing body.”1 Applying the statute and the rule to the facts of this case, LUBA concluded that the Board issued a final decision on February 14,1984, and that the time in which to file a notice of intent to appeal expired on March 6, 1984. Under this analysis, petitioner’s notice of intent to appeal, filed March 9,1984, was not timely filed.
Petitioner’s first assignment of error relies on Multnomah County Code (MCC) 11.15.8280(D), which specifies when, for some purposes, a decision of the Board is deemed final. MCC 11.15.8280(D) states:
“The Board’s decision shall be final at the close of business *451on the tenth day after the decision, findings of fact and conclusions have been filed under subsection (C) above, unless the Board on its own motion grants a rehearing under MCC .8285(A).”
Petitioner claims that, pursuant to this provision, the Board’s decision was not final for the purpose of applying ORS 197.830(7) until February 24, 1984, and that its notice of intent to appeal was timely filed. Its argument is that OAR 661-10-010(3), in defining “final decision,” “merely provides information regarding LUBA’s subject matter jurisdiction,” without effectively prescribing the date of finality of an appealable order. In the absence of a statute or LUBA rule defining the date of finality, the argument goes, local governmental bodies may determine that for themselves.
We think that OAR 661-10-010(3) effectively establishes that a final decision exists, for the purpose of measuring the time to appeal to LUBA, as of the date when an order is reduced to writing and signed by an appropriate officer. Because LUBA has acted to define finality, as the term is used in ORS 197.830(7), this definition must preempt any local attempt to define finality differently, contrary to the dissent’s opposite conclusion. (Dissent at 1.) Although MCC 11.15.8280(D) may provide ten days after a decision is filed with the clerk of the Board during which the Board may reconsider its decision, this provision cannot expand the 21-day period for filing an appeal with LUBA.
ORS 197.805 states that “[i]t is the policy of the Legislative Assembly that time is of the essence in reaching final decisions in matters involving land use * * *.” The 21-day period for filing a notice of intent to appeal a land use decision implements this policy. It would thwart the intent of the legislature to allow local rules which variously define finality to provide additional time in which to file a notice of intent to appeal. A local body cannot alter LUBA’s jurisdiction by the enactment of ordinances which purport to expand or limit LUBA’s authority. See Lyke v. Lane County, 70 Or App 82, 688 P2d 411 (1984).
The legislative scheme which establishes LUBA contemplates statewide uniformity in its operation. OAR 661-10-010(3) provides this uniformity by requiring a notice of intent to appeal to be filed within 21 days of when an order is reduced *452to writing and signed. This simple rule gives clear guidance to persons wishing to appeal land use decisions.
Petitioner states that on February 21, 1984, during the appeal period, the clerk of the Board mistakenly informed petitioner’s attorney that the order was “filed” with her on February 17, 1984. In its second assignment of error, petitioner claims that its reliance on the clerk’s misstatement entitles it to measure the 21-day appeal period from February 17, 1984, which would make its March 9, 1984, filing of the notice of intent to appeal timely. LUBA found that the clerk told petitioner’s attorney during the appeal period that the order was signed on February 17, 1984. LUBA ruled that the clerk’s misrepresentation is not binding on LUBA and cannot affect the statutory period of appeal. We agree with LUBA’s decision on this issue.
The record of the case before LUBA unequivocally establishes, and LUBA found, that a copy of the signed order was available for public inspection on the afternoon of February 14, 1984. Under these facts, petitioner’s failure to file its notice of intent to appeal timely is not excused by its reliance on the clerk’s misstatement. Far West Landscaping v. Modern Merchandising, 287 Or 653, 601 P2d 1237 (1979).
Affirmed.
The authority of LUBA to make this rule is not challenged. See McPherson v. Employment Division, 285 Or 541, 591 P2d 1381 (1979).