This case involves an action under article VII, section 1 of the Washington Constitution challenging certain ordinances passed by King County (County) which implement various funding provisions of Engrossed House Bill 2115 (the Stadium Act). Laws of 1995, 3d Spec. Sess., ch. 1. Appellants, Citizens for More Important Things and Chris Van Dyk (Citizens), assert the expenditure of public funds by the County for preconstruction costs of a major league baseball stadium prior to the County obtaining a *413binding commitment from a major league baseball team to play in the stadium is not for a valid public purpose. On cross-motions for summary judgment, the Superior Court dismissed Citizens’ complaint and granted the County’s motion for summary judgment and declaratory relief. We affirm.
FACTS
We are familiar with the facts giving rise to this case having recently considered and filed an opinion in CLEAN v. State, 130 Wn.2d 782, 928 P.2d 1054 (1996) (addressing the constitutionality of the Stadium Act which authorizes various measures for the construction of a major league baseball stadium in King County). Following the Legislature’s passage of the Stadium Act in an October 1995 special session, the County passed several ordinances implementing that legislation in order to begin the process of building a baseball, stadium, including King County Ordinance 12000 (Oct. 25, 1995), Ordinance 12176 (Mar. 29, Í996), and Ordinance 12213 (Apr. 19, 1996).
Through Ordinance 12000, the County implemented the various taxes authorized by the Stadium Act, created the Washington State Major League Baseball Stadium Facilities District (SFD) and an independent financial review committee, and authorized the assembly and conveyance to the SFD of real property necessary for the baseball stadium. Next, the County passed Ordinance 12176, appropriating $24,240,477 to the stadium project and authorizing moneys received from the State to be passed through to the SFD, in order to pay for preconstruction costs of the baseball stadium.
Shortly thereafter, the County realized the Stadium Act did not authorize State funds to be directly passed through to the SFD. The Stadium Act authorizes the funds generated by license plate and scratch ticket sales "for the purpose of paying the principal and interest payments on bonds issued by the county to construct a baseball stadium, *414. . ., including reasonably necessary preconstruction costs.” Laws of 1995, 3d Spec. Sess., ch. 1, §§ 103(3), 105. Therefore, the County enacted Ordinance 12213 authorizing the issuance of $5 million in bond anticipation notes, guaranteed by the State lottery and license plate revenues, to provide financing to the SFD for preconstruction costs.
On May 20, 1996 (approximately one month after Ordinance 12213 was enacted), Citizens filed its complaint in King County Superior Court. Citizens’ complaint alleged:
9. The collection and disbursement of taxes for construction of a new stadium which may never be built and which is to be designed and built for a single tenant who has not yet committed to use the stadium if and when built is an improper and unjustified gamble with taxpayer funds. Such gamble with tax collections is not a proper public purpose and is contrary to Article 7, § 1, of the Washington State Constitution.
Clerk’s Papers at 4-5. The complaint also alleged the financing provision of Ordinance 12213 was an "illegal sham.”
Following cross motions for summary judgment, the trial court entered its order on August 26, 1996, granting the County’s motion for summary judgment, declaring Ordinances 12000, 12176, and 12213 valid, and dismissing Citizens’ complaint with prejudice. Citizens filed a direct appeal to this court, which we accepted. We find the issues presented in this case are controlled by our recent opinion in CLEAN, 130 Wn.2d 782, and affirm the trial court.
ANALYSIS
The issues properly before this court are narrowly limited to: (1) whether preconstruction costs for a baseball stadium are for a proper article VII, section 1 public purpose when there is no binding commitment by the prospective tenant to lease the stadium; and (2) if the answer to the first issue is yes, whether the financing mechanism *415embodied in Ordinance 12213 is an "illegal sham.” Accordingly, while both parties have brought to our attention the lease agreement between the SFD and Baseball Club of Seattle, the County ordinance authorizing the sale of $336 million in construction bonds, and the declaratory judgment action filed by the County on January 18, 1997, none of those agreements or actions, nor any of the sub-issues raised therein, are before us for consideration at this time.
This case was resolved on cross-motions for summary judgment in the Superior Court; therefore, our review of the issues is de novo. Fell v. Spokane Transit Auth., 128 Wn.2d 618, 625, 911 P.2d 1319 (1996). A party challenging the constitutionality of a legislative enactment bears the burden of proving, beyond a reasonable doubt, that the enactment is unconstitutional. Erickson & Assocs., Inc. v. McLerran, 123 Wn.2d 864, 869, 872 P.2d 1090 (1994). Here, Citizens has not met its burden of proving beyond a reasonable doubt the unconstitutionality of the County ordinances at issue.
Preconstruction Costs
Citizens’ argument may be reduced to a single sentence: The expenditure of public funds for the preconstruction costs of a baseball stadium, designed to the specifications of a single prospective tenant, and without that prospective tenant’s binding commitment to lease the stadium, is not for a public purpose as required by article VII, section 1 of the Washington Constitution. Citizens neither cites nor provides any authority for this proposition.
In CLEAN, this court upheld the validity of the Stadium Act under article VII, section 1. CLEAN, 130 Wn.2d at 796. The Stadium Act authorizes the collection and use of certain State (license plate and lottery sales) and County (sales and use taxes) revenue sources to fund the building of a baseball stadium. Laws of 1995, 3d Spec. Sess., ch. 1, pts. I and II. Additionally, the Stadium Act explicitly *416authorizes the expenditure of these revenues for precon-struction costs of a baseball stadium. Laws of 1995, 3d Spec. Sess., ch. 1, §§ 103(3), 105, 20K3).1 Finally, the Stadium Act contains a limit on the collection of these revenues: neither County nor State stadium revenues may be collected after June 30, 1997, unless a major league baseball team has signed a legally enforceable contract to, among other things, play in the stadium for at least 20 years. Laws of 1995, 3d Spec. Sess., ch. 1, § 201(4)(a). While this section explicitly applies only to the County tax collections, the State license plate revenues are also limited because they may be collected only while the aforementioned County taxes are being collected. Laws of 1995, 3d Spec. Sess., ch. 1, § 103(3).
The Stadium Act authorizes the collection of revenues prior to obtaining a legally binding commitment for a major league baseball team. At the same time, the Stadium Act authorizes the expenditure of such revenues for the preconstruction costs associated with the project. Therefore, the Stadium Act, as upheld by this court in CLEAN, authorizes the expenditure of public funds for preconstruction costs of a baseball stadium without the agreement of a major league baseball team to play in the stadium, at least until June 30, 1997.
Citizens fails to offer any authority for its position to the contrary. Therefore, we hold the expenditure of precon-struction costs by the County, as explicitly authorized by the Stadium Act, to be for a valid public purpose.
Ordinance 12213 and Bond Anticipation Notes
While County tax revenues may be expended directly for preconstruction costs of the baseball stadium, the Stadium Act limits the' expenditure of the State license plate and lottery revenues "for the purpose of paying the *417principal and interest payments on bonds issued by the county to construct a baseball stadium, . . ., including reasonably necessary preconstruction costs.” Laws of 1995, 3d Spec. Sess., ch. 1, §§ 103(3), 105. Recognizing this, the County issued $5 million in bond anticipation notes for preconstruction costs, pledging the payment of State lottery and license plate revenues. RCW 39.50 authorizes municipalities to issue short term obligations for "any lawful purpose” in anticipation of the sale of general obligation bonds if the general obligation bonds may be issued without the assent of the voters. RCW 39.50.020.
Again, Citizens’ argument.can be reduced to a single sentence: It is not a "lawful purpose” to expend funds on preconstruction costs for a stadium designed for a single tenant who has yet to commit to lease the stadium. As demonstrated in the previous section, this court has held the Stadium Act is for a valid article VII, section 1 public purpose. The Stadium Act authorizes the expenditure of the State revenues for paying principal and interest for bonds issued to build the stadium, including preconstruction costs. Because the preconstruction costs of the stadium are for a lawful public purpose, the County did not act illegally in issuing bond anticipation notes under RCW 39.50. Because the County has legally issued bond anticipation notes, it may use the State revenues to pay the principal and interest on those notes. Additionally, Ordinance 12213 complies with the requirements of the Stadium Act because the bond anticipation notes fall within the definition: "bonds issued by the county to construct a baseball stadium, . . ., including reasonably necessary preconstruction costs.” Laws of 1995, 3d Spec. Sess., ch. 1, §§ 103(3), 105. We find the funding mechanism embodied in Ordinance 12213 is not an "illegal sham.”
CONCLUSION
Citizens offers no substantive argument or authority for its contentions regarding the expenditure of funds for pre-construction costs and the issuance of bond anticipation *418notes. The Superior Court granted the County’s motion for declaratory judgment, finding Ordinances 12000, 12176, and 12213 valid. Our majority opinion in CLEAN v. State, supra, answers both of Citizens’ arguments. Therefore, we affirm the judgment and order of the Superior Court.
Durham, C.J., and Dolliver, Smith, Guy, Madsen, and Alexander, JJ., concur.
As will be discussed, infra, expenditure of the State revenues is authorized for preconstruction costs, but limited to payments of principal and interest on bonds issued for construction or preconstruction of the baseball stadium. Laws of 1995, 3d Spec. Sess., ch. 1, §§ 103, 105.