Quinn-Brintnall, J.
— The City of Burien appeals a Thurston County Superior Court judgment affirming a Central Puget Sound Growth Management Hearings Board (Board) decision upholding comprehensive plan and zoning amendments adopted by the City of SeaTac. SeaTac proposed the amendments in accordance with an interlocal agreement to settle litigation with the Port of Seattle. At issue is whether SeaTac circumvented the public participation requirements of the Growth Management Act (GMA) by entering into an interlocal agreement during negotiations that were not open to the public. The Board ruled that SeaTac complied with the GMA’s public participation requirements, and Thurston County Superior Court affirmed. We likewise affirm.
FACTS
In an attempt to settle litigation over jurisdictional matters (among other issues) regarding plans for the pro[378]*378posed third runway at Sea-Tac Airport, the City of SeaTac and the Port of Seattle entered into an “Agreement for Confidentiality In Settlement Negotiations” in October 1996. From time to time, counsel briefed SeaTac’s City Council in executive session on the status of negotiations with the Port.1
At its May 1997 public meeting, SeaTac’s Planning Commission discussed proposed amendments to SeaTac’s Comprehensive Plan (Plan). Attached to the minutes of that meeting was the Preliminary Docket for the Plan amendment, which stated that copies of the original applications for the Plan amendments were “available for public review on request.” Admin. R. (Exs.) at 2615. Burien submitted an application with the following proposed amendments: the preservation of Miller Creek, cooperation between SeaTac and Burien regarding Westside residential areas, development of a greenbelt plan with trails connecting the neighboring cities, and cooperation among neighboring cities regarding surface water and drainage planning.
The Commission again addressed Plan amendments at its June 16, 1997 Planning Commission meeting. According to the minutes, SeaTac’s principal planner, Craig Ward, explained at the meeting that “some of the amendments have been deferred due to the City of SeaTac and the Port of Seattle negotiations. The deferred amendments would be reviewed if the conditions for deferral are satisfied in time for final docket consideration.” Admin. R. (Exs.) at 2700. The Burien planning commissioner who proposed the above amendments addressed the Commission, expressing her desire to have the amendments enacted.2
[379]*379SeaTac and the Port entered into an Interlocal Agreement (ILA), on September 4, 1997.3
Four days later SeaTac’s planning director briefed the Commission on the newly executed ILA:
Mr. Butler briefly explained to the Planning Commission that [sic] the City’s and the Port’s role to be able to successfully complete the ILA. The City needs to have their amendments to the comprehensive plan done by December 31, 1997, and the Port needs to implement their changes following the City.
The City and the Port need to adopt a coordinated land use map by December 31, 1997, and. . . this map needs to ... 1) implemento . . . the City’s zoning map; 2) [be] updated to recognize the Port’s Master Plan of a third runway; 3) resolve 0 any discrepancies per uses of Port-owned property on the perimeter; and 4) reflect 0 the City land use decisions which will affect the airport.
Admin. R. (Exs.) at 2747-48.
The ILA
The ILA was executed by the Port and SeaTac, respectively, on August 29, 1997, and September 4, 1997, and went into effect on September 4, 1997. In pertinent part, the ILA reflects the parties’ agreement to “adopt the planning, land use and zoning provisions set forth in Exhibit A hereto and shall implement the same.” Admin. R. (Exs.) at 3903.
The Land Use Agreement in Exhibit A provides for cooperative comprehensive planning and economic development in contemplating changes to the comprehensive plan:
1.1 General. The Port and City shall engage in cooperative comprehensive planning to jointly address issues related to the Port’s Airport properties and activities and [380]*380the City’s economic development, land use and related goals. The cooperative planning shall strive for consistency between the City’s Comprehensive Plan and the Port’s Master Plan (and related portions of the Puget Sound Regional Council’s regional planning decisions). The objective is the reciprocal recognition of the Port’s Master Plan (and related portions of the Puget Sound Regional Council’s regional planning decisions) in the City’s Comprehensive Plan and the relevant portions of the City’s Comprehensive Plan in the Port’s Master Plan (e.g. land use, economic development, transportation and capital facilities). The coordinated comprehensive planning activities shall include:
1.1.1 Land Uses. A land use element with appropriate Comprehensive Plan policies and land-use designations for Port properties [and related properties]. The parties shall develop a land use map displaying the results of the coordinated planning. A noise-contour overlay map will be included to foster Airport compatible land-use planning and used to guide land-use decisions within the City. Existing Part 150 noise guidelines shall be incorporated into the policies.
1.5 Adoption and Amendment.
1.5.1 Adoption.
1.5.1.1 General. The Port adopted its Master Plan update on August 1, 1996 .... The third runway has been incorporated into the Metropolitan Transportation Plan adopted by the Puget Sound Regional Council. The City adopted its GMA Comprehensive Plan in December 1994____
The City Council and Port Commission respectively shall consider adoption of updates to the City Comprehensive Plan and the Port’s Master Plan to implement the coordinated planning conducted under this ¶ 1. The Port and City may adopt appropriate portions of their coordinated planning without adoption of all elements listed under ¶ 1.1 above.
1.5.1.2 By City. On or before December 31, 1997, the City shall consider an amendment to its GMA Compre[381]*381hensive Plan in substantially the following form . . . :
The City’s Comprehensive Plan Use Map designates a single airport land use for all properties owned or to be owned by the Port under the Port Master Plan. The development regulations, which are contained in the attached Interlocal Agreement, have two zones (“Aviation Operations” and “Aviation Commercial”) within the airport land use designation. Development of the Airport shall be done in accordance with the Interlocal Agreement and shall control in the case of any conflict with other provisions of this Comprehensive Plan. ...
Admin. R. (Exs.) at 3909-10 (emphasis added).
The parties also agreed in Exhibit A of the ILA that each
shall adopt a coordinated land use map that (a) shall be implemented by the City’s zoning map; (b) is updated to recognize the Port’s Master Plan (e.g., third runway); (c) resolves any discrepancies on the permitted uses of Port-owned property on the perimeter of the Airport (e.g.,
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Quinn-Brintnall, J.
— The City of Burien appeals a Thurston County Superior Court judgment affirming a Central Puget Sound Growth Management Hearings Board (Board) decision upholding comprehensive plan and zoning amendments adopted by the City of SeaTac. SeaTac proposed the amendments in accordance with an interlocal agreement to settle litigation with the Port of Seattle. At issue is whether SeaTac circumvented the public participation requirements of the Growth Management Act (GMA) by entering into an interlocal agreement during negotiations that were not open to the public. The Board ruled that SeaTac complied with the GMA’s public participation requirements, and Thurston County Superior Court affirmed. We likewise affirm.
FACTS
In an attempt to settle litigation over jurisdictional matters (among other issues) regarding plans for the pro[378]*378posed third runway at Sea-Tac Airport, the City of SeaTac and the Port of Seattle entered into an “Agreement for Confidentiality In Settlement Negotiations” in October 1996. From time to time, counsel briefed SeaTac’s City Council in executive session on the status of negotiations with the Port.1
At its May 1997 public meeting, SeaTac’s Planning Commission discussed proposed amendments to SeaTac’s Comprehensive Plan (Plan). Attached to the minutes of that meeting was the Preliminary Docket for the Plan amendment, which stated that copies of the original applications for the Plan amendments were “available for public review on request.” Admin. R. (Exs.) at 2615. Burien submitted an application with the following proposed amendments: the preservation of Miller Creek, cooperation between SeaTac and Burien regarding Westside residential areas, development of a greenbelt plan with trails connecting the neighboring cities, and cooperation among neighboring cities regarding surface water and drainage planning.
The Commission again addressed Plan amendments at its June 16, 1997 Planning Commission meeting. According to the minutes, SeaTac’s principal planner, Craig Ward, explained at the meeting that “some of the amendments have been deferred due to the City of SeaTac and the Port of Seattle negotiations. The deferred amendments would be reviewed if the conditions for deferral are satisfied in time for final docket consideration.” Admin. R. (Exs.) at 2700. The Burien planning commissioner who proposed the above amendments addressed the Commission, expressing her desire to have the amendments enacted.2
[379]*379SeaTac and the Port entered into an Interlocal Agreement (ILA), on September 4, 1997.3
Four days later SeaTac’s planning director briefed the Commission on the newly executed ILA:
Mr. Butler briefly explained to the Planning Commission that [sic] the City’s and the Port’s role to be able to successfully complete the ILA. The City needs to have their amendments to the comprehensive plan done by December 31, 1997, and the Port needs to implement their changes following the City.
The City and the Port need to adopt a coordinated land use map by December 31, 1997, and. . . this map needs to ... 1) implemento . . . the City’s zoning map; 2) [be] updated to recognize the Port’s Master Plan of a third runway; 3) resolve 0 any discrepancies per uses of Port-owned property on the perimeter; and 4) reflect 0 the City land use decisions which will affect the airport.
Admin. R. (Exs.) at 2747-48.
The ILA
The ILA was executed by the Port and SeaTac, respectively, on August 29, 1997, and September 4, 1997, and went into effect on September 4, 1997. In pertinent part, the ILA reflects the parties’ agreement to “adopt the planning, land use and zoning provisions set forth in Exhibit A hereto and shall implement the same.” Admin. R. (Exs.) at 3903.
The Land Use Agreement in Exhibit A provides for cooperative comprehensive planning and economic development in contemplating changes to the comprehensive plan:
1.1 General. The Port and City shall engage in cooperative comprehensive planning to jointly address issues related to the Port’s Airport properties and activities and [380]*380the City’s economic development, land use and related goals. The cooperative planning shall strive for consistency between the City’s Comprehensive Plan and the Port’s Master Plan (and related portions of the Puget Sound Regional Council’s regional planning decisions). The objective is the reciprocal recognition of the Port’s Master Plan (and related portions of the Puget Sound Regional Council’s regional planning decisions) in the City’s Comprehensive Plan and the relevant portions of the City’s Comprehensive Plan in the Port’s Master Plan (e.g. land use, economic development, transportation and capital facilities). The coordinated comprehensive planning activities shall include:
1.1.1 Land Uses. A land use element with appropriate Comprehensive Plan policies and land-use designations for Port properties [and related properties]. The parties shall develop a land use map displaying the results of the coordinated planning. A noise-contour overlay map will be included to foster Airport compatible land-use planning and used to guide land-use decisions within the City. Existing Part 150 noise guidelines shall be incorporated into the policies.
1.5 Adoption and Amendment.
1.5.1 Adoption.
1.5.1.1 General. The Port adopted its Master Plan update on August 1, 1996 .... The third runway has been incorporated into the Metropolitan Transportation Plan adopted by the Puget Sound Regional Council. The City adopted its GMA Comprehensive Plan in December 1994____
The City Council and Port Commission respectively shall consider adoption of updates to the City Comprehensive Plan and the Port’s Master Plan to implement the coordinated planning conducted under this ¶ 1. The Port and City may adopt appropriate portions of their coordinated planning without adoption of all elements listed under ¶ 1.1 above.
1.5.1.2 By City. On or before December 31, 1997, the City shall consider an amendment to its GMA Compre[381]*381hensive Plan in substantially the following form . . . :
The City’s Comprehensive Plan Use Map designates a single airport land use for all properties owned or to be owned by the Port under the Port Master Plan. The development regulations, which are contained in the attached Interlocal Agreement, have two zones (“Aviation Operations” and “Aviation Commercial”) within the airport land use designation. Development of the Airport shall be done in accordance with the Interlocal Agreement and shall control in the case of any conflict with other provisions of this Comprehensive Plan. ...
Admin. R. (Exs.) at 3909-10 (emphasis added).
The parties also agreed in Exhibit A of the ILA that each
shall adopt a coordinated land use map that (a) shall be implemented by the City’s zoning map; (b) is updated to recognize the Port’s Master Plan (e.g., third runway); (c) resolves any discrepancies on the permitted uses of Port-owned property on the perimeter of the Airport (e.g., Seafirst Bank, Bai Tong Restaurant); and (d) reflects the City land use decisions that affect the Airport. Both the City Council and the Port Commission shall adopt the coordinated land use map on or before December 31, 1997 (and the City shall adopt it concurrently with its Comprehensive Plan Amendment).
Admin. R. (Exs.) at 3911 (emphasis added).
The Port committed to pay SeaTac $26 million dollars under the ILA’s “community relief package.”4
SeaTac enacted an ordinance (No. 97-1025) amending the Plan on December 9, 1997, and adopted zoning code and map amendments (Ordinance Nos. 98-1001 and 98-1002) on January 13, 1998.
[382]*382Procedural History
Burien5 filed a petition for review of SeaTac’s Plan and zoning amendments with the Board on February 11, 1998, arguing, among many other things, that SeaTac failed to comply with the GMA public participation requirements. Burien asked the Board to review (1) SeaTac’s amendment to its Plan; (2) the ILA with the Port “which Agreement is an expressly referenced and integral component of the SeaTac Plan”; and (3) the January 13,1998 amendments to the zoning code and map. Admin. R. at 1. The Board ruled that SeaTac complied with the GMA and upheld the amendments.
The Thurston County Superior Court affirmed the Board’s decision. Burien appealed directly to our Supreme Court, which transferred the case to this court.
ANALYSIS
We review decisions of the Board under the Administrative Procedure Act (APA), chapter 34.05 RCW, which calls for a review of the record created before the Board— not the decision of the superior court. Buechel v. Dep’t of Ecology, 125 Wn.2d 196, 202, 884 P.2d 910 (1994). We review the Board’s legal conclusions de novo, giving substantial weight to its interpretation of the statute it administers where the agency has specialized expertise in dealing with such issues. City of Redmond v. Cent. Puget Sound Growth Mgmt. Hearings Bd., 136 Wn.2d 38, 46, 959 P.2d 1091 (1998); Diehl v. Mason County, 94 Wn. App. 645, 652, 972 P.2d 543 (1999). The burden of demonstrating the invalidity of the Board’s action is on the party asserting invalidity; here, that party is Burien. See RCW 34.05-.570(1)(a); City of Redmond, 136 Wn.2d at 45.
Presumption and Burden of Proof Before the Board
Amendments to comprehensive plans and development regulations are presumed valid upon adoption. RCW [383]*38336.70A.320(1). The burden is on the petitioner to demonstrate that any city action is not in compliance with the GMA requirements. RCW 36.70A.320(2). When reviewing a challenge to any city action, the Board shall find compliance unless it determines that the action by the city “is clearly erroneous in view of the entire record before the board and in light of the goals and requirements of [the GMA].” RCW 36.70A.320(3) (emphasis added).
(1) Assignments of Error to Findings Abandoned Because Not Argued
Burien assigns error to nine findings of fact. But it provides no argument supporting its challenges to these findings.6 Therefore, we treat the Board’s findings as verities. See Stuewe v. Dep’t of Revenue, 98 Wn. App. 947, 950, 991 P.2d 634, review denied, 141 Wn.2d 1015 (2000).
(2) Jurisdiction of Growth Management Hearings Board
[6-8] Growth management hearings boards are charged with adjudicating GMA compliance and, when necessary, with invalidating noncompliant comprehensive plans and development regulations. RCW 36.70A.280, .302; King County v. Cent. Puget Sound Growth Mgmt. Hearings Bd., 142 Wn.2d 543, 552, 14 P.3d 133 (2000). Growth management hearings boards shall hear and determine only those petitions alleging either
(a) That a state agency, county, or city planning under this chapter is not in compliance with the requirements of this chapter, chapter 90.58 RCW as it relates to the adoption of shoreline master programs or amendments thereto, or chapter 43.21C RCW as it relates to plans, development regulations, or amendments, adopted under RCW 36.70A.040 or chapter 90.58 RCW; or
[384]*384b) That the twenty-year growth management planning population projections adopted by the office of financial management pursuant to RCW 43.62.035 should be adjusted.
RCW 36.70A.280(1).
Through chapter 36.70A RCW, the legislature carefully limited the authority of the various growth management hearings boards. Skagit Surveyors & Eng’rs, LLC v. Friends of Skagit County, 135 Wn.2d 542, 565, 958 P.2d 962 (1998) (citing RCW 36.70A.280(1), .290). The GMA does not contain a requirement that it be liberally construed. Skagit Surveyors & Engineers, 135 Wn.2d at 565. Unless a petition alleges that a comprehensive plan or a development regulation (or amendments to either) is not in compliance with the requirements of the GMA, the Board does not have jurisdiction to hear the petition. Wenatchee Sportsmen Ass’n v. Chelan County, 141 Wn.2d 169, 178, 4 P.3d 123 (2000).
Here, the Board clarified the limits of its jurisdiction, explaining that the negotiation and execution of the ILA itself was a non-GMA action and, thus, was not subject to the Board’s jurisdiction. But it ruled that “provisions of the ILA, if any, that are included as Plan or zoning code amendments are subject to the provisions of RCW 36.70A.140 during the plan or zoning code amendment process.” Admin. R. at 5403. We presume the Board meant that it could not review the ILA itself, but it could — and did — review the process by which portions of the ILA became amendments to SeaTac’s comprehensive and zoning plans.
Burien claims that the Board lacked jurisdiction to conclude that the ILA ‘“influenced, but did not dictate, the form, substance and timing of some of the proposed Plan and zoning code amendments.’” Br. of Appellant at 12-13 (quoting Admin. R. at 5407). On the contrary, as to the ILA, [385]*385that is the one surviving issue the Board did have jurisdiction to address.7
Thus, the following claims are beyond the Board’s jurisdiction and outside the scope of this appeal: (1) that the Port and SeaTac entered into the ILA in violation of chapter 39.34 RCW; (2) that the ILA contains an invalid payment of $26 million contingent upon SeaTac’s performance;8 (3) that the ILA cut off Burien’s right to appeal;9 (4) that SeaTac violated the appearance of fairness doctrine;10 and [386]*386(5) that the “Portions of the Interlocal Agreement Characterized by SeaTac and the Port as a ‘Development Agreement’ are Invalid Under Both the Applicable State Statute and SeaTac’s Own Municipal Code and Should be Severed From the Rest of the Interlocal Agreement.”11 Br. of Appellant at 35.
The only issue properly before this court is whether the public was allowed “early and continuous” participation in the amendment process.
(3) Public Participation Under the GMA
The GMA requires each participating county and city to provide for “early and continuous public participation” in the development and amendment of its comprehensive land use plans and the development regulations implementing [387]*387such plans.12 RCW 36.70A.140. This must include broad dissemination of proposals, opportunity for written comment, public meetings after effective notice, open discussion, communication programs, information services, and consideration of and response to public comments. RCW 36.70A.140. However, inexact compliance with these procedures will not invalidate any adopted plan or amendment “if the spirit of the program and procedures is observed.” RCW 36.70A.140.
The Board’s standard of review required it to invalidate the amendments only if it found that SeaTac’s actions in adopting the plan amendments were clearly erroneous in view of the entire record before the Board and in light of the public participation requirements of the GMA. For the Board to find that SeaTac’s actions were clearly erroneous, it must be “left with the firm and definite conviction that a mistake has been committed.” See Dep’t of Ecology v. Pub. Util. Dist. No. 1 of Jefferson County, 121 Wn.2d 179, 201, 849 P.2d 646 (1993), aff'd, 511 U.S. 700, 114 S. Ct. 1900, 128 L. Ed. 2d 716 (1994).
In its order, the Board explained that
[388]*388“while the requirement to consider public comment does not require elected officials to agree with or obey such comment, local government does have a duty to be clear and consistent in informing the public about the authority, scope and purpose of proposed planning enactments.”
Admin. R. at 5403 (quoting W. Seattle Def. Fund v. City of Seattle, No. 94-3-0016, 1995 WL 903147, at *51 (Cent. Puget Sound Growth Mgmt. Hr’gs Bd., Wash. Apr. 4, 1995)).
The GMA requires public participation, but it does not require that a city necessarily act upon the desires expressed by the public during that participation and comment:
However, the “public participation” that is one of the hallmarks of the GMA, does not equate to “citizens decide.” The Act requires the elected legislative bodies of cities and counties, not individual citizens, to ultimately “decide” on the direction and content of policy documents such as county-wide planning policies and comprehensive plans. The Act assigns this policy making authority to city and county elected officials, who are accountable to their citizens at the ballot box.
Twin Falls v. Snohomish County, No. 93-3-0003, 1993 WL 839715, at *55 (Cent. Puget Sound Growth Mgmt. Hr’gs Bd., Wash. Sept. 7, 1993) (quoting Poulsbo v. Kitsap County, No. 92-3-0009, 1993 WL 839713, at *26 (Cent. Puget Sound Growth Mgmt. Hr’gs Bd., Wash., Apr. 6, 1993)).13 (4) Proper Forum
The Board properly ruled that the ILA was not executed under the GMA and, by its terms, it did not amend [389]*389SeaTac’s plan or regulations: “[T]he negotiation and execution of the ILA itself, a non-GMA action, is not subject to the public participation requirements of the GMA over which the Board has jurisdiction.” Admin. R. at 5403.
We agree that the Board lacked jurisdiction to review the interlocal agreement and affirm.
Hunt, C.J., and Armstrong, J., concur.