The Oklahoma Industries Authority (OIA), a public trust, created pursuant to 60 O.S.1961, § 176 et seq., as amended, sponsored the “public trust” financing for the construction of General Motors Corporation’s (GMC) assembly plant in Oklahoma City. The issue presented is whether GMC’s interest (improvements, machinery and equipment) in the plant is subject to ad valorem taxation. GMC contends its interest is not taxable because of a tax abatement agreement between it and the State of Oklahoma. GMC asserts that public agencies and officials of the State of Oklahoma agreed that if GMC would build its assembly plant in Oklahoma that such plant would not be subject to ad valorem taxation for twenty years.
The trial court in rendering summary judgment against GMC found that Art. 10, § 5, of the Old. Const, prohibits a contract which surrenders, suspends or contracts away the power of taxation, and although the existence of a contract is disputed, such contract, even if it could be established, would be void and contrary to law; and that the assembly plant is in possession of GMC under an executory contract of purchase and is taxable under State ex rel. Cartwright v. Dunbar, Okl., 618 P.2d 900 (1980).
Since the Legislature first authorized the creation of public trusts as a vehicle for “public trust” financing in 1951, numerous facilities throughout the state have been constructed by private entities using such financing. Dunbar explains the method generally employed in Oklahoma and such method was used in financing part of the construction of GMC’s assembly plant. Here, a lease contract and bond indenture were entered into between the public trust (OIA) and GMC. OIA issued bonds.to help pay for part of the construction costs of *235the facility. GMC paid all additional construction costs. OIA holds legal title to the property. GMC’s lease payments to OIA are sufficient to amortize the bond issue and other costs. GMC will “purchase” the entire project for $1,000 when the bonded indebtedness is satisfied.
In Dunbar we held that the trust properties in which private entities hold a possessory and contractual interest by virtue of a lease agreement with a public trust as holder of legal title was subject to ad valorem taxation. Dunbar was bottomed on the theory that the Dunbar lease agreement was nothing more or less than an executory contract of sale and that property of a public trust held under a sale-purchase executory contract is not constitutionally tax exempt. GMC concedes that its assembly plant would be taxable under Dunbar but for the tax abatement agreement.
GMC says that the characterization of its agreement with OIA as a “lease” or “exec-utory contract” is not of consequence as GMC understands its tax abatement agreement with Oklahoma. GMC states the substance of the agreement and this lawsuit is that Oklahoma agreed to a tax abatement for the assembly plant in return for GMC constructing the plant in Oklahoma. GMC says that it has fulfilled its part of the agreement.
GMC contends that the agreement was lawful when made and any state action which impairs the obligation of that agreement violates Art. 1, § 10, of the United States Constitution. GMC argues the Legislature in the Public Trust Act classified industrial property for tax purposes pursuant to Art. 10, § 22, of the Okl. Const., to improve economic activity and to create jobs in Oklahoma; that OIA, a state agency which was created pursuant to the Act, bargained with GMC for the tax abatement; and the negotiations and contracts of OIA constitute the negotiations and contracts of the State of Oklahoma. GMC also submits that the Attorney General’s opinion (69-156) rendered in 1969, in which he expressed the view that public trust properties were not subject to ad valorem taxation was incorporated into and became a part of the tax abatement agreement between OIA and the State.
Closely related to GMC’s argument that the imposition of the ad valorem taxes impairs the obligations of its tax abatement agreement is its assertion that it has been denied due process. GMC argues that the Fifth Amendment through the Fourteenth Amendment of the Federal Constitution forbids the taking of property without just compensation and that its tax abatement agreement is a property right. GMC says that both contract and property rights arising from its tax abatement agreement are protected by the Due Process Clause as well as by the Impairment of Contract Clause.
In Dunbar we considered the constitutionality of 60 O.S.1981, § 178.7 enacted in 1977. That enactment authorized a tax exemption for a period of years of all interests in public trust property, but the lessee (GMC-here) of public trust property was required to pay an annual sum in lieu of ad valorem taxes for each year following the tenth anniversary date of the issuance of the revenue bonds.
In Dunbar we said that Art. 5, § 50, Okl. Const., prohibits the Legislature from exempting any property from taxation except as provided in the Constitution. We held that since other property similarly situated was statutorily taxable, any legislative attempt to delay the taxable status of a lessee’s interest in public trust property would be in conflict with Art. 5, § 50, supra, and unconstitutional.
Art. 10, § 22, of the Constitution authorizes the Legislature to classify property for purposes of taxation; and the valuation of different classes by different means or methods. The Legislature has a wide range of discretion in classifying subjects of taxation, and to justify judicial interference, the classification must be based on an unreasonable or arbitrary classification. Continental Oil Company v. Oklahoma State Board etc., Okl., 570 P.2d 315 (1977).
*236Although the property belonging to a public trust is exempt from taxation— Art. 10, § 6, Okl. Const. — the interest a lessee (GMC-here) has in public trust property is subject to ad valorem taxation. Dunbar, supra.
If the property here had not been “leased” from a public trust, it would have been taxed as all other property similar situated under our general statutory scheme of taxation. Any attempt, legislative or otherwise, to exempt property from taxation in the possession of a “lessee” under an executory contract of purchase where the record title to the property is in a public trust, and not exempt similar property where record title to the property is in a private entity instead of a public trust, would contravene Art. 10, § 22, supra.
In Dunbar we also held that the State was not estopped from assessing the “lessee’s” property because of its reliance on the generally held view that such interest was exempt from taxation. Our holding was based on the principle that a state and its subdivision cannot be estopped from protecting public rights when public officials have acted erroneously or failed to act.
We will now consider the enforceability of the alleged tax abatement agreement. GMC did not introduce the agreement into the record but relied upon certain opinions of the Attorney General, statements of officials of the State of Oklahoma and of various civic organizations, correspondence and news releases, and representations made by officials of OIA. In its journal entry of judgment the trial court in referring to the agreement said “although its existence is in dispute, such contract, even if it could be established, would be void and contrary to law.”
The lease agreement between GMC and OIA did not spell out the tax abatement agreement but it did mention ad valorem taxes. One sentence stated that the parties recognized that as OIA is an agency of the state, the assembly plant was not subject to ad valorem taxation under the Constitution and laws of Oklahoma. However, the parties did agree that in the event the State of Oklahoma or any of its subdivisions shall demand the payment of any general or ad valorem tax that GMC would pay the tax.
We will assume, arguendo, that OIA, a state agency, entered into the tax abatement agreement with GMC; and that both parties relied upon the then current Attorney General’s opinion which expressed the view that public trust properties were not subject to taxation.
Under general legal principles, public agents have no power to bind the state or any of its subdivisions by apparent authority in excess of their actual authority. “An unconstitutional act is not a law; it binds no one, and protects no one.” Little Rock, etc., Railway v. Worthen; and Huntington v. Worthen, 120 U.S. 97, 7 S.Ct. 469, 30 L.Ed. 588. If the Legislature has not acted within the framework of the Constitution, it has not acted. An unconstitutional statute confers no rights, creates no liability, and affords no protection. Norton v. Shelby County, 118 U.S. 425, 6 S.Ct. 1121, 30 L.Ed. 178. In Zane v. Hamilton County, 189 U.S. 370, 23 S.Ct. 538, 47 L.Ed. 858, county bonds were issued pursuant to a statute which was later declared to be unconstitutional. The United States Supreme Court held that the bonds having been illegally issued, do not constitute a contract which is protected by the Federal Constitution. 16A Am.Jur.2d, Constitutional Law, § 688, states:
“The Federal Constitution does not protect contracts which are invalid, illegal ... That which is not an enforceable contract right is not an obligation which can be impaired within the meaning of the constitutional prohibition.
The impairment of a contract cannot occur where the alleged contract is based on a proviso contained in a void statute. A contract which rests on an unconstitutional statute is itself void and creates no obligation to be impaired by subsequent legislation.”
*237GMC argues that the rule in Norton has long been abandoned by both the federal and state courts and this abandonment is discussed in Lemon v. Kurtzman, 411 U.S. 192, 93 S.Ct. 1463, 36 L.Ed.2d 151 (1973). In Lemon, non-public sectarian schools had performed services under a statute which was subsequently declared unconstitutional. The issue was whether the schools were entitled to be reimbursed for services performed prior to the court’s holding that the statute was unconstitutional. The Supreme Court held the schools were entitled to be reimbursed for such services.
The Lemon decision is bottomed upon the theory of reliance, i.e., the schools had performed the services under a statute that had not been declared unconstitutional and for nearly two years the State and the schools proceeded to act on the assumption that the schools would continue to perform the services and that payment for such services would be made. The Court noted that the significance of the school’s reliance was reinforced by the fact that State withdrew its motion for a preliminary injunction to block certain payments and did not seek injunctive relief for the suspension of payments.
The Supreme Court in Lemon, discussing the broad discretionary powers of the trial court in shaping equity decrees, said:
“The essence of equity jurisdiction has been the power of the Chancellor to do equity and to mould each decree to the necessities of the particular case. Flexibility rather than rigidity has distinguished it. The qualities of mercy and practicality have made equity the instrument for nice adjustment and reconciliation between the public interest and private needs as well as between competing private claims.”
This court in effect followed the reasoning set forth in Lemon when it first considered the taxability of public trust property held under an executory contract to purchase in Dunbar. Our decision in Dunbar was promulgated in January, 1980, and was prospective in reference to taxability. In discussing the retroactive application of that decision, we said:
“In our opinion the ‘equities in this case do not authorize retroactive application of our decision herein’ (see Ford [State ex rel. Nesbitt v. Ford, Okl., 434 P.2d 934], supra) to any year preceding the 1980 tax year. Prior to the July 31, 1979, opinion of the Attorney General expressing the conclusion that such property was taxable, the taxing authorities had been following a former opinion of an Attorney General who had concluded the property was tax-exempt. Therefore, the interests of private entities in public trust property which are taxable under this decision shall be taxable beginning with the 1980 tax year, but no interests in any public trust property shall be considered or treated as ‘omitted property’ for any preceding year.”
We are concerned here with an alleged tax exemption that the Legislature could not constitutionally grant. Surely if the Legislature is without constitutional authority to grant a tax exemption, state agencies or officials of the state could not grant such exemption. GMC was charged with notice of our Constitution and the limitations of public officials, and it may not rely on assumed authority whether such authority is assumed by the Legislature or other public officials. GMC was charged with notice of the authority of the Attorney General whose opinions may not supplant the courts. The Attorney General gives his opinion for public officials’ guidance until the questions concerning them are decided by the courts. Grand River Dam Authority v. State, Okl., 645 P.2d 1011 (1982). GMC may not invoke in this proceeding the “reliance interest” discussed in Lemon.
The cases relied upon by GMC involve constitutional legislative enactments or valid contracts and it relies on the principle that “the laws which subsist at the time and place of the making of a contract, and where it is to be performed, enter into and form a part of it,” United States ex rel. Von Hoffman v. The City of Quincy, 71 *238U.S. 535, 18 L.Ed. 403 (1867), quoting in Home Building and Loan Association v. Blaisdell, 290 U.S. 398, 54 S.Ct. 231, 78 L.Ed. 413, 88 A.L.R. 1481 (1934). This general statement of law cannot be disputed but it does not support GMC's position, because the purported tax abatement contract was not in accord with Oklahoma law at the time it was made.
Our decision in Dunbar is controlling in the case at bar and GMC’s property is subject to ad valorem taxation unless the disputed tax abatement agreement is legally enforceable. The Federal Constitution does not protect unenforceable contract rights. The disputed agreement, even if it could be established, is void because no public official or public agency could constitutionally grant the tax exemption allegedly contained in the agreement. Since the alleged agreement is unenforceable, GMC is not entitled to the tax relief it sought.
In view of our decision here, we find it unnecessary to consider the force and effect of Art. 10, § 5 of our Constitution which prohibits the surrender of the power of taxation and requires taxes to be uniform upon the same class of subjects and the Fourteenth Amendment to the U.S. Constitution.
JUDGMENT AFFIRMED.
All the Justices concur.