Opinion by
¶ 1 Plaintiff, Rocky Mountain Natural Gas, LLC (RMNG), appeals the summary-judgment entered in favor of defendant, the Colorado Mountain Junior. College District (CMC). We affirm.
I. Background
¶ 2 This dispute arises from a lease agreement between RMNG and CMC. RMNG is a Colorado utility company that provides natural gas services. CMC is a junior college district organized under sections 23-71-101 to -133, C.R.S.2013. As relevant here, the board of trustees of a junior college district has the power to “[r]ent or lease district property not immediately needed for its purposes for. terms not exceeding three years.” § 23-71-122(l)(e), C.R.S.2013.
¶ 4 In May of 2012, CMC’s board of trustees voted to not recognize the lease, and CMC refunded the payments it had received from RMNG. Thereafter, RMNG sued CMC, seeking a declaratory judgment that the lease was valid, specific performance of the lease, damages as an alternative form of relief for multiple breaches of the lease, and preliminary and permanent injunctive relief.
¶ 5 CMC moved to dismiss RMNG’s claims, contending in part that the lease was void, invalid, and unenforceable as a matter of law, because the term of the lease exceeded CMC’s statutory authority.
¶ 6 The district court dismissed RMNG’s claim for specific performance and determined that the remainder of CMC’s motion to dismiss must be treated as a motion for summary judgment.
¶ 7 As to RMNG’s claim for damages, the court determined that RMNG was not entitled to judicial relief. The court discussed the decision in Normandy Estates Metropolitan Recreation District v. Normandy Estates, Ltd.,
Where the absence of relief would be “grossly inequitable[,]” ... the limited relief of restoring the private contracting party to its property [can] be granted. Here, CMC returned the lease payment made by RMNG. Although the result may be harsh, under the rule of Normandy, the absence of relief is not grossly inequitable.
¶ 8 Thus, the court granted summary judgment in favor of CMC, ruling that CMC’s lack of authority to enter into the lease renders immaterial the other disputed issues of fact.
¶ 9 On appeal, RMNG contends that the district court erred as a matter of law in granting summary judgment in favor of CMC.
II. Standard of Review
¶ 10 We review de novo a district court’s grant of summary judgment. Ryder v. Mitchell,
III. Validity of the Lease A. The Entire Lease Is Invalid
¶ 11 RMNG first contends that the district court erred by determining that the lease was entirely void and unenforceable. We perceive no error.
¶ 12 CMC is authorized to contract as a municipal corporation. See § 23-71-120, C.R. S.2013 (authorizing junior college districts to hold property and be parties to suits and contracts “the same as municipal corporations in this state”). Statutorily created government entities, including municipalities, may exercise only those powers that are expressly conferred by the General Assembly or that exist by necessary implication. S. Fork Water & Sanitation Dist. v. Town of S. Fork,
¶ 13 Statutory construction presents a question of law that we review de novo. S. Fork,
¶ 14 Section 23-71-122(l)(e) governs the lease in this case. As noted above, that section provides that junior college districts “shall have the power to ... [r]ent or lease district property ... for terms not exceeding three years.” It follows from the plain language of the statute that junior college districts have no power to lease district property for any term longer than three years.
¶ 15 On appeal, RMNG concedes that the lease in this case exceeded three years. However, RMNG contends that “the district court should have enforced the Lease up to CMC’s statutory authority to enter it, making the Lease a binding contract for a three-year term.”
¶ 16 The parties do not cite, and we have not found, Colorado authority directly addressing the issue presented here. Although RMNG relies on authorities from other jurisdictions concerning municipal contracts covering a period of time longer than a statutorily authorized period, these cases do not present similar circumstances as in this case.
¶ 17 For example, in Torn of Highlands v. Weyant,
¶ 18 In Washington County Board of Education v. MarketAmerica, Inc.,
¶ 19 Finally, the circumstances presented here are distinguishable from situations in several older eases cited by RMNG, in which services had already been provided under
¶ 20 We conclude that the better view here is that the contract is entirely void. “A fundamental requirement for the enforcement of a municipal contract is that the municipality must -have exercised its.authority to enter into the contract within the scope of the powers conferred by statute.” Miller v. Marshall Cnty.,
¶ 21 In addition to undermining the legislative intent behind the statute, construing such contracts to be enforceable, even if only for the statutorily authorized period, would amount to the court rewriting the parties’ agreement. A court may not make a new contract for the parties or rewrite their contract under the guise of construction. 11 Richard ’ A. Lord, Williston on Contracts § 31:5 (4th ed. 1993). Here, the agreement between RMNG and CMC provided for a lease of property, at an agreed price, for a period of twenty years, with an option to extend the lease for twenty more years. The purpose of the lease was to allow the construction and operation of a natural gas compressor station on GMC’s property.
¶ 22 Citing to Affordable Country Homes, LLC v. Smith
B. The Duration Term of the Lease Is Not Seyerable
¶ 24 The lease between RMNG and CMC contained the following savings clause: “If any part, term or provision of this Lease is ... held to be illegal, void, or unenforceable, or to be in conflict with the law of the state in which said land lies, the validity of the remaining provisions or portion hereof shall not be affected.”
¶ 26 RMNG contends that the district court erred when it refused to enforce the lease for a three-year term in accordance with this clause. RMNG asserts that the clause reflects the parties’ intent, and that the law permits courts to sever the ultra vires portion of an agreement and enforce the valid portions. RMNG asks this court to find that the portion of the duration term that would not violate the statute (the first three years of the term) is valid and that the remaining seventeen-year portion is the only invalid part. Contract interpretation is a question of law that we review de novo. Vu, Inc. v. Pac. Ocean Marketplace, Inc.,
¶ 26 RMNG has cited no authority to support the theory that changing the duration term from twenty years to three years constitutes a permissible “severance” of part of the contract. See Walters v. Vill. of Colfax,
' ¶ 27 Moreover, we conclude that, because the contract in its entirety is void, having been made absent statutory authority, there is no contract from which any portion can be severed. See Miller, 641 N.W.2d at' 762 (“Because the contract in its entirety is void, there is nothing left to sever.... [Njeither the separability clause in the lease agreement nor the general doctrine of separability can save the municipal contract in this case.”).
¶ 28 Accordingly, we’ affirm the district court’s determination that the term of years could not be -reformed and that the entire lease was therefore void and unenforceable.
• C. Equitable Estoppel Is Not Available
¶29 RMNG next contends that the district court erred “by refusing to estop CMC from defending its breach by-arguing that one ultra vires portion of the lease—the 20-year term—rendered it void in its entirety.” Again, we perceive no error.
¶ 30 The doctrine of equitable es-toppel is based on principles f fairness, and it may be invoked against municipalities to prevent manifest injustice. See Tarco, Inc. v. Conifer Metro. Dist.,
¶ 32 Estoppel is not available here, even though RMNG detrimentally relied upon the municipal contract by making expenditures. See 10A Eugene McQuillen, The Law of Municipal Corporations § 29:104.30 (3d ed., rev.vol.2009). “The rationale supporting this well-established principle is that those who contract with a municipality are charged with notice of the limits on the authority of the municipality.” Miller,
¶ 33 Because CMC had no power to lease district property for any term exceeding three years, principles of estoppel do not apply against CMC under the circumstances presented here. Accordingly, the district court did not err when it allowed CMC to deny the validity of the lease.
IV. Equitable Relief
¶34 RMNG next contends that, even if the lease is void for lack of statutory authority, the district court erred because it “failed to follow the mandates of [Normandy ] and [La Plata ] when it refused to hold a hearing or make factual findings that would permit it to craft a remedy which ‘fully compensated’ RMNG for CMC’s breach.” RMNG requests that this court reverse the summary judgment order “to permit RMNG the opportunity to present evidence of its detrimental reliance and other factors.” We conclude that RMNG was not entitled to a hearing on damages and was fully compensated under Normandy and La Plata.
¶ 35 In Normandy, the plaintiff, a private corporation, contracted with a metropolitan district for the purchase and sale of property.
¶ 36 In resolving this question, the court created an exception to the general principle of law that prohibited all recovery under such circumstances: “We hereby adopt what appears to be the prevailing rule: that where property is furnished to a municipal corporation under an unenforceable contract, and the municipality has not paid for the property, then the seller or person supplying the property may, upon equitable terms, recover it in specie.” Id. at 296,
¶ 37 RMNG contends that, under the holdings of Normandy and La Plata, the district court was required to craft an equitable remedy to “fully compensate” RMNG for the damages and harm it suffered as a result of CMC’s breach of the lease. RMNG’s reliance on these cases is misplaced.
¶ 38- In Normandy, the district sought to retain the benefit it received under the void contract without providing compensation to the private corporation. There, the court allowed the corporation to recover either the specific property transferred pursuant to the contract or the value of the property, notwithstanding the fact that the contract was void. 191 Colo, at 296,
¶ 39 The district’s liability in Normandy was based not. on contract law but on a theory of restitution. 191 Colo, at 297,
Restitution measures the remedy by the defendant’s gain and seeks to force disgorgement of that gain in order to prevent the defendant’s unjust enrichment. Restitution, which seeks to prevent unjust enrichment of the defendant, differs in principle from damages, which measure the remedy by the plaintiffs loss and seek to provide compensation for that loss.
Earthlnfo, Inc. v. Hydrosphere Res. Consultants, Inc.,
Under the principle that a person who is unjustly enriched at the expense of another is required to make restitution, the intentions of the parties have little or no influence on the determination of the proper measure of damages; in the absence of fraud or other tortious conduct on the part of the party enriched, restitution is properly limited to the valué of the benefit received.
66 Am.Jur.2d Restitution and Implied Contracts § 166 (2001). Because the equitable remedy discussed in Normandy was based on restitution, there was no liability in excess of the benefit received. See La Plata,
¶ 40 Here, unlike the district in Normandy, CMC has not attempted to retain the value it received' under the lease without compensating RMNG. Instead, it refunded the lease payments it received from RMNG. Accordingly, RMNG was fully compensated for the benefit it conferred upon CMC and the district did not err when it denied further relief and granted summary judgment in favor of CMC.'
V. Conclusion
¶ 41 The judgment is affirmed.
Notes
. Section 23—71—122(l)(d), C.R.S.2013, authorizes a junior college district to "[s]ell and convey
. On appeal, RMNG does not challenge the denial of its request for specific performance.
. According to RMNG's complaint, "[a] compressor station consists of one or more buildings, with the principled] building containing one or ■ more compressors and compressor engines connected to the underground pipeline. The smaller buildings are a maintenance building, a control building, and a utility building.”
. The instant case is distinguishable from CapitalValue Advisors, LLC v. K2D, Inc.,
