Maguire Oil Co. v. City of Houston
This text of 69 S.W.3d 350 (Maguire Oil Co. v. City of Houston) is published on Counsel Stack Legal Research, covering Court of Appeals of Texas primary law. Counsel Stack provides free access to over 12 million legal documents including statutes, case law, regulations, and constitutions.
Opinion
OPINION
Opinion by
Justice ROSS.
Maguire Oil Company 1 (Maguire) appeals the summary judgment granted in favor of the City of Houston. Maguire sued the City alleging damages when the City revoked a permit authorizing Maguire to drill a gas well near Lake Houston, a freshwater reservoir and the City’s main source of drinking water.
In its petition, Maguire claimed it applied for and received a permit from the City on May 7, 1991. The City ratified and modified the permit on May 22, 1991, and extended the permit on August 5,1991. The location of the well was on the shore *356 of Lake Houston, approximately 300 feet from the lake.
Maguire claimed it began preparing the land for drilling, signed a drilling contract, purchased nearby leases for the purpose of offset drilling, and began moving equipment onto the drilling site. On October 31, 1991, the City issued a stop work order. In a separate letter sent to Ma-guire’s attorney, the City acknowledged the permit “appealed] to have been issued in error” and revoked it, effective immediately. The letter referenced Houston Code of Ordinances Sections 23-101 and 23-102, which at the time prohibited drilling a well within the City’s extraterritorial jurisdiction (ETJ) 2 and 1,000 feet of the normal water’s edge of Lake Houston.
Maguire sought a judgment declaring the permit valid. It also sought a declaration that Section 23-102 is unreasonable in that it makes no provision for special circumstances and it discriminates against oil and gas wells by allowing other types of wells to be drilled within the 1,000-foot limit. 3 Maguire sought a further declaration that the City engaged in selective enforcement of Section 23-102 by allowing other oil and gas wells to be drilled within the 1,000-foot limit.
Further, Maguire alleged the City’s actions amounted to inverse condemnation of its mineral interests in violation of the Due Process Clauses of the Fifth and Fourteenth Amendments to the United States Constitution and the Due Course of Law provision of the Texas Constitution. Ma-guire contended it was entitled to recover the value of the minerals in place.
As an alternative to its inverse condemnation claim, Maguire alleged it was entitled to rebanee damages it incurred under either a negligent misrepresentation theory, if the permit was invalid, or under a promissory estoppel theory, if the permit was valid. Maguire further alleged the City was estopped from denying the validity of the permit.
The parties each filed motions for summary judgment. In its motion, the City contended Maguire’s inverse condemnation claim was barred by the statute of limitations. It also contended Maguire’s reliance on the permit was unreasonable, and thus Maguire could not prevail on its es-toppel theory. In its motion for partial summary judgment, Maguire contended it should prevail on its inverse condemnation claim as a matter of law. The trial court overruled both motions.
The City later filed a motion to exclude the testimony of one of Maguire’s expert witnesses. The trial court granted the City’s motion. The City then filed another motion for summary judgment and a motion to have the trial court reconsider its previous motion for summary judgment.
In its second motion for summary judgment, the City contended there was no evidence Maguire suffered economic loss as a result of the City’s action and no evidence the City engaged in selective enforcement of Section 23-102. Further, the City contended Section 23-102 was rationally related to a legitimate public purpose and therefore did not discriminate against Maguire. The City also alleged Maguire’s negligent misrepresentation, promissory estoppel, and estoppel claims were barred *357 by sovereign immunity. After a heai'ing, the trial court granted the City’s motions.
Maguire contends the trial court erred in granting summary judgment because (1) Maguire presented evidence of damages to support its inverse condemnation claim; (2) Maguire’s inverse condemnation claim was not barred by a statute of limitations; (3) sovereign immunity did not bar Ma-guire’s promissory estoppel and negligent misrepresentation claims because fact issues existed under a well-settled exception to sovereign immunity; and (4) Maguire presented evidence to support its selective enforcement claim.
The City moved for summary judgment under Tex.R. Civ. P. 166a(b). To prevail on such a motion, the movant must establish that there is no genuine issue of material fact and that the movant is entitled to judgment as a matter of law. Tex.R. Civ. P. 166a(c). Summary judgment for a defendant is proper when the defendant negates at least one element of each of the plaintiffs theories of recovery, or pleads and conclusively establishes each element of an affirmative defense. Sci. Spectrum, Inc. v. Martinez, 941 S.W.2d 910, 911 (Tex.1997). When reviewing a summary judgment, we take as true all evidence favorable to the nonmovant. Rhone-Poulenc, Inc. v. Steel, 997 S.W.2d 217, 223 (Tex.1999). We indulge every reasonable inference and resolve any doubt in the nonmovant’s favor. Id. On appeal, the movant still bears the burden of showing that there is no genuine issue of material fact and that the movant is entitled to judgment as a matter of law. Id.
Because the City moved for summary judgment in part on the ground the statute of limitations had run, it must have (1) conclusively proved when the cause of action accrued, and (2) negated the discovery rule, if it applies and was pleaded or otherwise raised, by proving as a matter of law there is no genuine issue of material fact about when Maguire discovered, or in the exercise of reasonable diligence should have discovered, its cause of action. See KPMG Peat Marwick v. Harrison County Hous. Fin. Corp., 988 S.W.2d 746, 748 (Tex.1999). If the City established the action was barred by the statute of limitations, Maguire must then have adduced summary judgment proof raising a fact issue in avoidance of the statute of limitations. See id.
The City also moved for a no-evidence summary judgment under Tex.R. Civ. P. 166a(i). When a party moves for a no-evidence summary judgment, that party does not bear the burden of establishing each element of its own claim or defense, as under Rule 166(a) or (b). Garrett v. L.P. McCuistion Cmty. Hosp., 30 S.W.3d 653, 655 (Tex.App.-Texarkana 2000, no pet.). Rather, although the nonmoving party is not required to marshal its proof, that party must present evidence that raises a genuine fact issue on the challenged elements of the claims on which the non-movant would have the burden of proof at trial. Id.
Because a no-evidence summary judgment is essentially a pretrial directed verdict, we apply the same legal sufficiency standard as we apply in reviewing a directed verdict. Id. We consider all the evidence in the light most favorable to the nonmovant, disregarding all contrary evidence and inferences. Id.
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OPINION
Opinion by
Justice ROSS.
Maguire Oil Company 1 (Maguire) appeals the summary judgment granted in favor of the City of Houston. Maguire sued the City alleging damages when the City revoked a permit authorizing Maguire to drill a gas well near Lake Houston, a freshwater reservoir and the City’s main source of drinking water.
In its petition, Maguire claimed it applied for and received a permit from the City on May 7, 1991. The City ratified and modified the permit on May 22, 1991, and extended the permit on August 5,1991. The location of the well was on the shore *356 of Lake Houston, approximately 300 feet from the lake.
Maguire claimed it began preparing the land for drilling, signed a drilling contract, purchased nearby leases for the purpose of offset drilling, and began moving equipment onto the drilling site. On October 31, 1991, the City issued a stop work order. In a separate letter sent to Ma-guire’s attorney, the City acknowledged the permit “appealed] to have been issued in error” and revoked it, effective immediately. The letter referenced Houston Code of Ordinances Sections 23-101 and 23-102, which at the time prohibited drilling a well within the City’s extraterritorial jurisdiction (ETJ) 2 and 1,000 feet of the normal water’s edge of Lake Houston.
Maguire sought a judgment declaring the permit valid. It also sought a declaration that Section 23-102 is unreasonable in that it makes no provision for special circumstances and it discriminates against oil and gas wells by allowing other types of wells to be drilled within the 1,000-foot limit. 3 Maguire sought a further declaration that the City engaged in selective enforcement of Section 23-102 by allowing other oil and gas wells to be drilled within the 1,000-foot limit.
Further, Maguire alleged the City’s actions amounted to inverse condemnation of its mineral interests in violation of the Due Process Clauses of the Fifth and Fourteenth Amendments to the United States Constitution and the Due Course of Law provision of the Texas Constitution. Ma-guire contended it was entitled to recover the value of the minerals in place.
As an alternative to its inverse condemnation claim, Maguire alleged it was entitled to rebanee damages it incurred under either a negligent misrepresentation theory, if the permit was invalid, or under a promissory estoppel theory, if the permit was valid. Maguire further alleged the City was estopped from denying the validity of the permit.
The parties each filed motions for summary judgment. In its motion, the City contended Maguire’s inverse condemnation claim was barred by the statute of limitations. It also contended Maguire’s reliance on the permit was unreasonable, and thus Maguire could not prevail on its es-toppel theory. In its motion for partial summary judgment, Maguire contended it should prevail on its inverse condemnation claim as a matter of law. The trial court overruled both motions.
The City later filed a motion to exclude the testimony of one of Maguire’s expert witnesses. The trial court granted the City’s motion. The City then filed another motion for summary judgment and a motion to have the trial court reconsider its previous motion for summary judgment.
In its second motion for summary judgment, the City contended there was no evidence Maguire suffered economic loss as a result of the City’s action and no evidence the City engaged in selective enforcement of Section 23-102. Further, the City contended Section 23-102 was rationally related to a legitimate public purpose and therefore did not discriminate against Maguire. The City also alleged Maguire’s negligent misrepresentation, promissory estoppel, and estoppel claims were barred *357 by sovereign immunity. After a heai'ing, the trial court granted the City’s motions.
Maguire contends the trial court erred in granting summary judgment because (1) Maguire presented evidence of damages to support its inverse condemnation claim; (2) Maguire’s inverse condemnation claim was not barred by a statute of limitations; (3) sovereign immunity did not bar Ma-guire’s promissory estoppel and negligent misrepresentation claims because fact issues existed under a well-settled exception to sovereign immunity; and (4) Maguire presented evidence to support its selective enforcement claim.
The City moved for summary judgment under Tex.R. Civ. P. 166a(b). To prevail on such a motion, the movant must establish that there is no genuine issue of material fact and that the movant is entitled to judgment as a matter of law. Tex.R. Civ. P. 166a(c). Summary judgment for a defendant is proper when the defendant negates at least one element of each of the plaintiffs theories of recovery, or pleads and conclusively establishes each element of an affirmative defense. Sci. Spectrum, Inc. v. Martinez, 941 S.W.2d 910, 911 (Tex.1997). When reviewing a summary judgment, we take as true all evidence favorable to the nonmovant. Rhone-Poulenc, Inc. v. Steel, 997 S.W.2d 217, 223 (Tex.1999). We indulge every reasonable inference and resolve any doubt in the nonmovant’s favor. Id. On appeal, the movant still bears the burden of showing that there is no genuine issue of material fact and that the movant is entitled to judgment as a matter of law. Id.
Because the City moved for summary judgment in part on the ground the statute of limitations had run, it must have (1) conclusively proved when the cause of action accrued, and (2) negated the discovery rule, if it applies and was pleaded or otherwise raised, by proving as a matter of law there is no genuine issue of material fact about when Maguire discovered, or in the exercise of reasonable diligence should have discovered, its cause of action. See KPMG Peat Marwick v. Harrison County Hous. Fin. Corp., 988 S.W.2d 746, 748 (Tex.1999). If the City established the action was barred by the statute of limitations, Maguire must then have adduced summary judgment proof raising a fact issue in avoidance of the statute of limitations. See id.
The City also moved for a no-evidence summary judgment under Tex.R. Civ. P. 166a(i). When a party moves for a no-evidence summary judgment, that party does not bear the burden of establishing each element of its own claim or defense, as under Rule 166(a) or (b). Garrett v. L.P. McCuistion Cmty. Hosp., 30 S.W.3d 653, 655 (Tex.App.-Texarkana 2000, no pet.). Rather, although the nonmoving party is not required to marshal its proof, that party must present evidence that raises a genuine fact issue on the challenged elements of the claims on which the non-movant would have the burden of proof at trial. Id.
Because a no-evidence summary judgment is essentially a pretrial directed verdict, we apply the same legal sufficiency standard as we apply in reviewing a directed verdict. Id. We consider all the evidence in the light most favorable to the nonmovant, disregarding all contrary evidence and inferences. Id. A no-evidence summary judgment is improperly granted if the nonmovant presents more than a scintilla of probative evidence to raise a genuine issue of material fact. Id. More than a scintilla of evidence exists when the evidence rises to a level that would enable reasonable and fair-minded people to differ in their conclusions. Id.
*358 Inverse Condemnation Claim
The Fifth Amendment to the United States Constitution provides private property shall not be taken for public use without just compensation. U.S. Const. amend. V. The provision is applicable to the states under the Due Process Clause of the Fourteenth Amendment. U.S. Const, amend. XIV. The Texas Constitution also contains a “takings clause,” which provides in part “[n]o person’s property shall be taken, damaged or destroyed for or applied to public use without adequate compensation being made, unless by the consent of such person,_” Tex. Const. art. 1, § 17.
If the government appropriates property without paying adequate compensation, the owner may recover the resulting damages in an inverse condemnation suit. Westgate, Ltd. v. State, 843 S.W.2d 448, 452 (Tex.1992). An inverse condemnation may occur when the government physically appropriates or invades the property, or when it unreasonably interferes with the landowner’s right to use and enjoy the property, such as by restricting access or denying a permit for development. Id. To maintain a cause of action for inverse condemnation, the plaintiff must prove (1) an intentional governmental act, (2) resulting in the taking, damaging, or destruction of the plaintiffs property, (3) for public use. Gen. Servs. Comm’n v. Little-Tex Insulation Co., 39 S.W.3d 591, 598 (Tex.2001).
Statute of Limitations
In its first motion for summary judgment, the City contended the statute of limitations barred Maguire’s inverse condemnation claim. The City’s theory is that Section 23-102 was enacted in 1967; therefore, Maguire had to file any inverse condemnation cause of action within ten years of that date. 4 It cites Trail Enters., Inc. v. City of Houston, 957 S.W.2d 625, 628 (Tex.App.-Houston [14th Dist.] 1997, pet. denied), in which the appellant asserted an inverse condemnation cause of action after it sought to drill on land within 1,000 feet of Lake Houston. The court of appeals held the cause of action accrued in 1967, the date the ordinance was enacted and, therefore, the date the City first interfered with the appellant’s right to use the property. Id. at 631. The court further held suit had to be filed within ten years of the date the ordinance was passed. Id. at 631, 633.
Maguire contends the statute of limitations does not bar its action because Sections 23-101 and 23-102 do not apply. Maguire contends that, at the time the City revoked the permit, Sections 23-101 and 23-102 prohibited drilling on land in the City’s ETJ and 1,000 feet from Lake Houston. The parties do not dispute Ma-guire’s lease is within the Houston city limits and not in the City’s ETJ.
The summary judgment proof shows the 1967 ordinance prohibited any oil, gas, liquid hydrocarbon, or any other mineral well from being drilled within “the control area of Lake Houston which is nearer than 1000 *359 feet from the normal water level of Lake Houston.... ” “Control area” was defined in a 1965 ordinance as, “The land around the Lake within an area five (5) miles in width measured from the Normal Water’s Edge of, and within the watershed of, Lake Houston.” A 1977 ordinance redefined the control area as, “That land contained in the extraterritorial jurisdiction of the City of Houston, Texas, which contains waters that flow into or adjacent to the watershed of Lake Houston.”
When construing statutes, our ultimate purpose is to discover the Legislature’s intent. Meritor Auto., Inc. v. Ruan Leasing Co., 44 S.W.3d 86, 89 (Tex.2001). In determining that intent, the Legislature has instructed we may consider, among other things, the object sought to be obtained, the circumstances under which the statute was enacted, the legislative history, and the consequences of a particular construction. Id.; see also Tex. Gov’t Code Ann. § 311.023 (Vernon 1998). We begin, however, with the words the Legislature used. Meritor Auto., Inc., 44 S.W.3d at 89. “If the meaning of the statutory language is unambiguous, we adopt, with few exceptions, the interpretation supported by the plain meaning of the provision’s words and terms.” Id., quoting Fitzgerald v. Advanced Spine Fixation Sys., Inc., 996 S.W.2d 864, 865 (Tex.1999). These rules apply to the construction of city ordinances. Mills v. Brown, 159 Tex. 110, 316 S.W.2d 720, 723 (1958); Rosenblatt v. City of Houston, 31 S.W.3d 399, 403 (Tex.App.-Corpus Christi 2000, pet. denied), cert. denied, 532 U.S. 1067, 121 S.Ct. 2218, 150 L.Ed.2d 211 (2001).
Standing alone, the language of the ordinance does not support the City’s position. The 1977 amendment redefined the control area to include only “[t]hat land contained in the extraterritorial jurisdiction of the City of Houston, Texas, which contains waters that flow into or adjacent to the watershed of Lake Houston.” Maguire’s lease is within the city limits and not in the City’s ETJ. Consequently, the ordinance’s literal language would not apply to Ma-guire’s lease.
The City contends, “If an ordinance is susceptible to two constructions, one being valid and the other being invalid, the courts will adopt the construction rendering [the] ordinance valid,” quoting Moore v. Cox, 215 S.W.2d 666, 668 (Tex.Civ.App.-Fort Worth 1948, no writ), and citing In re Bay Area Citizens Against Lawsuit Abuse, 982 S.W.2d 371, 380 (Tex.1998), and Proctor v. Andrews, 972 S.W.2d 729, 735 (Tex.1998). The City contends that, if we follow Maguire’s interpretation, then landowners in the City’s ETJ would be prohibited from drilling, but adjoining landowners within the city limits would be permitted to drill. Therefore, similarly situated landowners would be treated differently, making the ordinance void.
The City’s argument presumes the City had no rational basis to draw that distinction. If the City had a rational basis to treat similarly situated landowners differently, a question we do not address here, then the ordinance would not be void. As Maguire observes, the City does not have standing to contend one of its own ordinances creates a violation of the due process or equal protection clauses. Proctor, 972 S.W.2d at 734.
The City also contends that the ordinance’s obvious purpose was to protect Lake Houston and that any other interpretation would frustrate that purpose. However, it is conceivable the city council determined it could protect Lake Houston and still allow drilling within the city limits, but not in the City’s ETJ. Our conclusion is bolstered by the fact that, under the 1977 amendment, not all drilling is prohibited in the City’s ETJ, only drilling *360 on land “which contains waters that flow into or adjacent to the watershed of Lake Houston.” Presumably, then, drilling could occur on land that is within 1,000 feet of Lake Houston if the land did not contain “waters that flow into or adjacent to the watershed of Lake Houston.”
Further, the City’s position is at variance with its position in Trail Enterprises. There the appellant raised an equal protection challenge on the ground that “the Ordinance requires a small group of mineral interest owners with interests in the control area, which is in the City’s ETJ, to pay the cost of protecting the City’s water supply,” and that “mineral owners within the city limits are free to drill within 1000 feet of the lake and its drains (including man-made), streams, or tributaries regardless of the proximity of the wells to Lake Houston.” Trail Enters., Inc., 957 S.W.2d at 634. The City responded that “the Ordinance applies equally to all mineral interest owners whose interests are within the City’s ETJ in the Lake Houston control area.” Id.
In addition, the City’s position is at variance with subsequent actions of the Houston city council. Maguire presented summary judgment proof showing that, in 1997, the City again amended the definition of “control area” to include “[tjhat land either in the city, or in the extraterritorial jurisdiction of the city, .... ” The resolution by which the ordinance was passed recites in part:
WHEREAS, as a result of recent annexations, a significant portion of the protected area around Lake Houston formerly in the City’s extraterritorial jurisdiction is now within the City, and it is therefore necessary to amend the Code of Ordinances to include land within the City in the control area, ....
Finally, the City contends we should give great weight to its construction, as it is charged with administering and enforcing the ordinance. The City presented the affidavit of Richard Alexander, a senior inspector for water production for the City and the city official responsible for enforcing city ordinances in and around Lake Houston. He states he has always interpreted the prohibition against drilling within 1,000 feet of Lake Houston as being applicable to land inside the city limits as well as land in its ETJ. In addition, the City presented the affidavit of Milton Bel-veal, the City’s senior inspector for planning and development. He states that, other than the permit issued to Maguire, the City has not issued a drilling permit for an oil, gas, or mineral well located within 1,000 feet of Lake Houston since 1967.
Construction of a statute by an administrative agency charged with its enforcement is entitled to serious consideration, so long as the construction is reasonable and does not contradict the plain language of the statute. Tarrant Appraisal Dist. v. Moore, 845 S.W.2d 820, 823 (Tex.1993). Here, however, the plain language of the ordinance prohibits drilling only in the City’s ETJ. Therefore, we will give no weight to the City’s construction of the ordinance.
We conclude summary judgment was inappropriate on Maguire’s inverse condemnation cause of action under the theory the statute of limitations had run. We need not consider Maguire’s additional argument the statute of limitations could not have run because its inverse condemnation cause of action did not accrue until (1) it exhausted all reasonable alternative means of production of the minerals, or (2) it discovered the only means available to access the minerals was to drill a well 300 feet from the edge of Lake Houston.
*361 Economic Loss
In its second motion for summary-judgment, the City contended there was no evidence Maguire suffered economic loss or damage as a result of the inverse condemnation. At the heart of the City’s contention was its motion to exclude the testimony of Wayman Gore, one of Ma-guire’s expert witnesses, which the trial court granted, and its objection to the affidavit of Cary Maguire, which the trial court implicitly sustained when it granted the City’s motion for summary judgment.
Utilizing geological reports and sample data, Gore estimated there is 47,304,000 mcf of gas present and recoverable under the Maguire lease and the potential value of this gas is at least $33,586,000.00. He calculated the value of the gas using transactional values, i.e., what companies pay to purchase proven reserves that are still “in the ground.” Gore used a transactional value of $0.71 mcf, which an independent service reported was the median value for the fourth quarter of 1991, the period when the City revoked Maguire’s permit.
Gore also calculated the value of the gas using a discounted cash flow analysis. This analysis assumed production over time beginning in late 1991. The quantity of gas assumed produced in each period was multiplied by the price reported in that period and reduced by the costs associated with drilling. The cash flow in each period was then discounted to account for the time value of money. Gore concluded the value of these cash flows discounted to the fourth quarter of 1991 was $42,377,000.00.
Gore admitted he had no opinion concerning the price a willing buyer would pay a willing seller for the gas. In fact, he expressed doubt that a willing buyer would pay $33,586,000.00 for the mineral prospect. Rather, he characterized his calculation as the fair market value to Maguire of drilling the well, producing the gas, and selling it.
In his affidavit, Cary Maguire stated that, in his opinion, the fair market value of Maguire’s mineral interest was at least $36,000,000.00. He based his opinion on his over forty-seven years’ experience as an independent oil and gas producer and on his position as a working interest owner. He also based his opinion on Gore’s calculations and methodologies.
When a government condemns real property, the normal measure of damages is the land’s market value. City of Harlingen v. Estate of Sharboneau, 48 S.W.3d 177, 182 (Tex.2001). Market value is the price the property will bring when offered for sale by one who desires to sell, but is not obliged to sell, and bought by one who desires to buy, but is under no necessity of buying. Id.
The City sought to exclude Gore’s testimony on the ground he used a faulty methodology to calculate economic loss resulting from the taking. The City contends Gore’s opinion was irrelevant because it was not based on an estimate of the market value of what was taken, i.e., the right to drill for gas, and speculative because it presumes minerals are present under the Maguire lease and can be recovered. Because Cary Maguire based his opinion, in part, on Gore’s methodologies and calculations, the City contended his opinion evidence suffered from the same deficiencies as Gore’s.
Maguire contends that the appropriate measure of damages is the value of the minerals in place and that it could properly introduce expert testimony to establish the value. Maguire relies on several cases to support its theory. In State v. Angerman, 664 S.W.2d 794, 796 (Tex.App.-Waco 1984, writ ref d n.r.e.), the court of appeals held it was not error to allow an expert to *362 testify about the amount of gravel on the land and the value of that gravel as a basis for his opinion of the market value of the land. In Coastal Indus. Water Auth. v. Trinity Portland Cement Div., 523 S.W.2d 462, 468 (Tex.Civ.App.-Houston [1st Dist.] 1975, writ ref'd n.r.e.), the court of appeals held that, as a means of determining the value of condemned land, an expert could testify as to the amount of clay in place and the market value per unit, and calculate the total value of the clay in place by multiplying the quantity by the price. In Brazos River Auth. v. Gilliam, 429 S.W.2d 949, 952-53 (Tex.Civ.App.-Fort Worth 1968, writ refd n.r.e.), the expert determined the value of the sand and gravel using data from three sales of gravel in place on other nearby tracts and used “a mathematical formula” to determine the value of the sand and gravel in place. In Brazos River Conservation & Reclamation Dist. v. Costello, 169 S.W.2d 977, 988 (Tex.Civ.App.-Eastland 1943, writ ref'd w.o.m.), the court of appeals held an expert could testify about the value of oil reserves under condemned property.
These cases are arguably distinguishable, either because the court was only concerned with the value of the minerals as an aid to determining the value of the land (Angerman, Coastal Industries, and Gilliam), because the minerals at issue involved less uncertainty in their extraction than oil and gas (Angerman, Coastal Industries, and Gilliam), and/or because the oil and gas condemned was from producing fields (Costello). 5
However, in Lomax v. Henderson, 559 S.W.2d 466, 466 (Tex.Civ.App.-Waco 1977, writ ref'd n.r.e.), the Brazos River Authority condemned 200 acres, of which the appellees owned the surface and an undivided mineral interest and the appellants owned an undivided one-fourth mineral interest in sixty-four acres. The Authority’s statement of condemnation expressly reserved the mineral interests to the defendants, but stipulated “no operations for the recovery of any such oil, gas, and other minerals shall be conducted on the surface of said premises.” Id. Yet there was no indication production of oil, gas, or other minerals was ongoing at the time the land was condemned. See id. at 467-68.
After the trial court rendered judgment, the appellees sought to withdraw the dam *363 age award from the court registry, asserting they were entitled to the full amount of damages because they owned the surface and the mineral interests were not condemned. Id. at 467. The appellants intervened, contending their mineral interests were rendered valueless by the restrictions on surface use. Id.
The court of appeals wrote, “Without question, appellants’ right of use of the surface of the land in question was taken from them. The proper measure of this loss, and the one sought to be shown by appellants on the trial, was the diminution of value of their mineral estate by the taking.” Id. (emphasis added). Though there is language in the court’s opinion suggesting the testimony centered around the value of the minerals in the ground, the overall thrust of the majority opinion and the dissenting opinion makes clear that the issue was the value of the mineral estate as a whole. See id. at 470 (James, J., dissenting) (“Appellants’ second ... point of error asserts the trial court erred in finding that Appellants’ mineral rights had no market value, and that such finding is so against the great weight and preponderance of the evidence as to be manifestly unjust. I would sustain this contention.”).
The Texas Supreme Court has acknowledged the primacy of comparable sales evidence to determine the market value of property taken. Estate of Sharboneau, 48 S.W.3d at 182. However, the court also acknowledged that, when comparable sales figures are lacking or the method is otherwise inadequate as a measure of fair market value, other methods of determining market value can be applied. Id. at 183. Whatever method an expert uses, however, “the goal of the inquiry is always to find the fair market value of the condemned property. An appraisal method is only valid if it produces an amount that a willing buyer would actually pay to a willing seller.” Id.
Federal courts have accepted evidence of comparable sales of mineral intei*ests to establish the value of a mineral interest taken. See Cal-Bay Corp. v. United States, 169 F.2d 15, 24 (9th Cir.1948); see also St. Genevieve Gas Co. v. Tennessee Valley Auth., 747 F.2d 1411, 1414 (11th Cir.1984) (trial court’s finding other mineral leases were not comparable to mineral leases at issue was not clearly erroneous); United States v. 179.26 Acres of Land, 644 F.2d 367, 371 (10th Cir.1981) (“The best evidence of market value of real property in condemnation is, of course, found in sales of comparable land within a reasonable time before the taking.”). Where evidence of comparable sales of mineral interests does not exist, however, federal courts have approved other valuation methods to determine the economic loss resulting from a taking. See 179.26 Acres of Land, 644 F.2d at 372. One federal court approved the use of a method very similar to the one Gore applied in the present case. United States v. 2,847.58 Acres of Land, 529 F.2d 682, 685 (6th Cir.1976) (“The witness No-sow emphasized the fact that he was not giving the value of the oil if it were produced and brought to the surface, but was testifying to what a willing buyer would pay and a willing seller would take for these mineral reserves in place.”). Other federal courts have used an income capitalization approach, which measures the present value of the income the estimated recoverable minerals could generate in a proven market, reduced by the cost to recover the minerals and an appropriate risk factor. See United States v. 2,560.00 Acres of Land, 836 F.2d 498, 503-04 (10th Cir.1988); United States v. 103.38 Acres of Land, 660 F.2d 208, 212 (6th Cir.1981); United States v. Whitehurst, 337 F.2d 765, 776 (4th Cir.1964).
*364 From this standpoint, Gore’s affidavit provided some evidence of market value. The City makes much of excerpts from Gore’s deposition and his affidavits where he states he calculated the fair market value of the gas “to Maguire.” However, Gore calculated the value of the gas by using transactional values reported for the fourth quarter of 1991. He explained that these transactional values are what companies pay to purchase reserves still “in the ground.” In short, his method measures comparable sales of “proven” reserves.
The City contends the reserves beneath Maguire’s lease are not “proven” and therefore Gore’s affidavit was speculative because it was based on the assumption there was gas present and recoverable. The City maintains sales of comparable mineral interests would provide better evidence of market value.
However, Maguire presented sufficient summary judgment proof to raise a fact question regarding the existence and re-coverability of gas on its lease. We agree evidence of comparable sales of mineral interests would provide a superior measure of market value, given that the existence of recoverable gas under Maguire’s lease is as yet unproven. Nevertheless, Maguire’s summary judgment proof is not deficient merely because it faded to provide such evidence. If competent comparable sales evidence exists, the parties will have the opportunity to present it at trial and the court must admit it to the exclusion of any other valuation evidence. In the absence of such evidence, Gore’s affidavit provides summary judgment proof of market value. In addition, even if Gore’s method of measuring the value of the minerals in place did not provide an adequate measure of market value, his use of a discounted cash flow analysis provided some proof of market value in the absence of comparable sales evidence. See Estate of Sharboneau, 48 S.W.3d at 183 (approving use of income capitalization method).
Therefore, summary judgment was inappropriate on Maguire’s inverse condemnation claim. We need not address Maguire’s contention that Cary Maguire’s affidavit also presents competent evidence of economic loss.
Negligent Misrepresentation and Promissory Estoppel Claims
As an alternative to its inverse condemnation claim, Maguire alleged it was entitled to reliance damages it incurred under either a negligent misrepresentation theory, if the permit was invalid, or under a promissory estoppel theory, if the permit was valid. While denying Maguire’s negligent misrepresentation and promissory es-toppel claims, the City moved for summary judgment under the doctrine of sovereign immunity.
A city is immune from liability for its governmental actions unless that immunity is waived. City of LaPorte v. Barfield, 898 S.W.2d 288, 291 (Tex.1995). Operation of a reservoir has been classified a governmental function for which a municipality is immune from suit except where immunity has been waived under the Texas Tort Claims Act. Tex. Civ. Prac. & Rem.Code Ann. § 101.0215(a)(19) (Vernon Supp.2002); see also Tex. Civ. Prac. & Rem. Code Ann. § 101.021 (Vernon 1997). Also, the issuance and denial of permits has been held to be a governmental function. See Trevino & Gonzalez Co. v. R.F. Muller Co., 949 S.W.2d 39, 42 (Tex.App.-San Antonio 1997, no writ); Kirschke v. City of Houston, 330 S.W.2d 629, 633 (Tex.Civ.App.-Houston 1969, writ ref'd n.r.e.) (development permit), overruled on other grounds, City of Austin v. Teague, 570 S.W.2d 389, 393 (Tex.1978).
*365 Maguire contends the City is es-topped from invoking sovereign immunity. The general rule is that, when a municipality or other unit of government is exercising its governmental powers, it is not subject to estoppel. City of Hutchins v. Prasifka, 450 S.W.2d 829, 835 (Tex.1970). However, a municipality may be estopped in those cases where justice requires the application of estoppel and there is no interference with the exercise of its governmental functions. Id. at 836, citing City of Dallas v. Rosenthal, 239 S.W.2d 636 (Tex.Civ.App.-Dallas 1951, writ refd n.r.e.). This exception is to be applied with caution and only in exceptional cases where the circumstances clearly demand its application. Id.
In Rosenthal, the city ordered the appel-lee to stop using his property as a meat storage facility in violation of city zoning ordinances, even though the city had issued two permits in a year and a half, visited the appellee’s property multiple times, and the appellee had expended substantial funds. See Rosenthal v. City of Dallas, 211 S.W.2d 279, 282, 291-92 (Tex.Civ.App.-Dallas 1948, writ ref'd n.r.e.) (hereinafter, Rosenthal I). Initially, the court of appeals affirmed the trial court’s judgment in favor of the city, but on rehearing reversed the judgment and sent the case back for a new trial. 6 Id. at 288, 294-95. At the end of the second trial, the trial court enjoined the city from enforcing the zoning ordinance. City of Dallas v. Rosenthal, 239 S.W.2d at 637 (hereinafter, Rosenthal II). In affirming the trial court’s judgment, the court of appeals held, “In exceptional cases (and surely this is one), a municipality, even in exercise of a governmental function, may be subjected to the same rules of equitable estoppel as are individuals where right and justice require it.” Id. at 645.
The Rosenthal cases are part of a line of cases applying or, in most cases, refusing to apply estoppel in the context of permitting and zoning actions. See John M. Black & Josiah M. Daniel, III, The Texas Rule of Estoppel in Zoning Cases, 33 Bay-loR L.Rev. 241, 247 (1981); David Hartman, Comment, Risky Business: Vested Real Property Development Rights — The Texas Experience and Proposals for the Texas Legislature to Improve Certainty in the Law, 30 Tex. Tech. L.Rev. 297, 309 (1999). For instance, in City of Amarillo v. Stapf, 129 Tex. 81, 101 S.W.2d 229, 232 (1937), and Davis v. City of Abilene, 250 S.W.2d 685, 688 (Tex.Civ.App.-Eastland 1952, writ refd), the courts held the unauthorized acts of city officials in wrongfully issuing permits to landowners could not estop the cities from enforcing their zoning ordinances. See also Black & Daniel, supra, at 244 n. 12 (and cases cited therein).
In Rosenthal, by contrast, the court held the building inspector was lawfully charged with determining whether the meat storage facility qualified as a permissible nonconforming use. Rosenthal II, 239 S.W.2d at 643; Rosenthal I, 211 S.W.2d at 291. The city did not appeal the building inspector’s determination in favor of the landowner; therefore, city officials acted on appropriate authority in issuing the permit and the city was estopped from repudiating it. Rosenthal II, 239 S.W.2d at 645; Rosenthal I, 211 S.W.2d at 291.
The City contends Rosenthal is not a common-law exception to sovereign immunity because Rosenthal did not involve sovereign immunity. Rather, the landowner *366 used estoppel as a defense to the city’s action in enforcement of its zoning ordinance. Further, the City contends Rosen-thal ⅛ holding would apply only if the City was seeking equitable relief, citing Marriott v. City of Dallas, 635 S.W.2d 561, 564 (Tex.App.-Dallas 1982), aff'd, 644 S.W.2d 469 (Tex.1983). In Marriott, the court viewed Rosenthal as being “squarely bottomed] ... upon the premise that the city, seeking equity, must show it had done equity.” Id.
The City’s contention ignores the fact that, when faced with the City’s stop work order, Maguire stopped working, thereby obviating the City’s need to seek equitable relief. Though the Rosenthal court was clearly concerned with balancing the equities between the parties, in part because the city sought injunctive relief, the court’s broader holding was that a city may be equitably estopped in exceptional cases where justice requires it. Rosenthal I, 239 S.W.2d at 645. We see no reason for applying this rule only when the city is seeking equitable relief.
Further, while Rosenthal did not technically involve an assertion of sovereign immunity, it did involve the principle that, when a city is exercising its governmental powers, it is not subject to estoppel. See Prasifka, 450 S.W.2d at 835. This principle is similar, if not identical, to the principle underlying sovereign immunity. See City of San Angelo v. Deutsch, 126 Tex. 532, 91 S.W.2d 308, 310 (1936) (“The cases in which questions of [immunity from] liability are presented are the same in their general nature and in the reasons underlying their decision as are those in which estoppel is invoked.”); Dillard v. Austin Indep. Sch. Dist., 806 S.W.2d 589, 594 (Tex.App.-Austin 1991, writ denied) (calling bar against invoking estoppel on city acting in its governmental capacity a corollary to sovereign immunity); see also Black & Daniel, supra, at 243 (stating because sovereign immunity tends to insulate city from negligent acts associated with zoning, Texas courts are reluctant to uphold estoppel against city’s enforcement of zoning ordinances).
The caselaw suggests that in order to apply estoppel the trial court must determine the following:
(1) whether the landowner is relying on an authorized act of a city official or employee, see Stapf, 101 S.W.2d at 232; Deutsch, 91 S.W.2d at 310; Krause v. City of El Paso, 101 Tex. 211, 106 S.W. 121, 123 (1907) (holding landowner entitled to rely on permit from mayor and survey of city engineer, both of which city ordinance required her to obtain before building); Rosenthal II, 239 S.W.2d at 643 (holding building inspector’s decision was one he was empowered to make); Rosenthal I, 211 S.W.2d at 291 (same); see also Black & Daniel, supra, at 241;
(2) whether this is the kind of case in which justice requires the application of estoppel, see Prasifka, 450 S.W.2d at 836; Arrington v. County of Dallas, 792 S.W.2d 468, 472 (Tex.App.-Dallas 1990, writ denied) (upholding summary judgment because circumstances not “so grave as to constitute manifest injustice”); and
(3) whether the application of estoppel would interfere with the exercise of the city’s governmental functions, see Prasifka, 450 S.W.2d at 836.
Further, relevant authorities suggest a party seeking to invoke estoppel against a city must demonstrate he or she qualifies under each element of equitable estoppel. See City of Lufkin v. McVicker, 510 S.W.2d 141, 145 (Tex.Civ.App.-Beaumont 1973, writ ref'd n.r.e.); see also Black & Daniel, supra, at 242. In McVicker, the court of appeals stated the landowner *367 failed to meet any of the elements of equitable estoppel, i.e.,
a false representation or concealment of material facts; it must have been made with knowledge, actual or constructive of the facts; the party to whom it was made must have been without knowledge or the means of knowledge of the real facts; it must have been made with the intention that it should be acted on; and the party to whom it was made must have relied on or acted on it to his prejudice.
McVicker, 510 S.W.2d at 145, quoting Gulbenkian v. Penn, 151 Tex. 412, 252 S.W.2d 929, 932 (1952). These are normally questions for the jury, but may be established (or refuted) as a matter of law by undisputed evidence. Jones v. Ray Ins. Agency, 59 S.W.3d 739, 752 (Tex.App.-Corpus Christi 2001, no pet. h.); Page Airways, Inc. v. Associated Radio Serv. Co., 545 S.W.2d 184, 192 (Tex.Civ.App.-San Antonio 1976, writ ref'd n.r.e.); see also Upchurch v. Albear, 5 S.W.3d 274, 277 (Tex.App.- Amarillo 1999, pet. denied); 4M Linen & Uniform Supply Co. v. W.P. Ballard & Co., 793 S.W.2d 320, 322 (Tex.App.-Houston [1st Dist.] 1990, writ denied).
Though we agree the elements of equitable estoppel must be present, we note the equitable estoppel recognized in Rosenthal was based on the city’s conduct. 7 The building inspector classified the meat storage facility as a permissible nonconforming use, the city did not appeal his decision, and the court estopped the city from later enforcing the ordinance. Rosenthal II, 239 S.W.2d at 643; Rosenthal I, 211 S.W.2d at 291. One who by his conduct has induced another to act in a particular manner should not be permitted to adopt an inconsistent position and thereby cause loss or injury to the other. Fabrique, Inc. v. Corman, 796 S.W.2d 790, 792 (Tex.App.- Dallas 1990), writ denied, 806 S.W.2d 801 (Tex.1991) (per curiam); Mobil Oil Corp. v. Frederick, 615 S.W.2d 323, 325 (Tex.Civ.App.-Fort Worth), aff'd in part & rev’d in part on other grounds, 621 S.W.2d 595 (Tex.1981); see also 31 C.J.S. Estoppel and Waiver § 59 (1996). In equitable estoppel by conduct, the fraud is the inconsistent position subsequently taken, rather than the original conduct. 28 AmJuh. 2d Estoppel and Waiver § 71 (2000).
In the present case, we conclude the City failed to establish grounds for avoidance of estoppel as a matter of law. Maguire presented sufficient summary judgment proof to show the actions of city officials were authorized. We have already stated that the language of Section *368 23-102 does not prohibit Maguire from drilling. 8 City officials issued Maguire three drilling permits, and the City does not contend Maguire failed to fulfill the formal requirements for obtaining these permits. Further, Alexander’s affidavit asserts that he is “a City official responsible for enforcing City ordinances in and around Lake Houston,” that he issued the stop work order, and that he revoked the permit. Therefore, the City failed to demonstrate, as a matter of law, its officials were not acting under the City’s authority.
In addition, Maguire demonstrated this is the kind of case in which justice requires application of estoppel. Maguire presented summary judgment proof that, after obtaining the permits, it expended $190,000.00 preparing the drill site, including clearing a wooded area, building a road, driving pipe, and reinforcing a bridge.
Also, estoppel would not interfere with the City’s exercise of its governmental functions. Though we have found no case applying the Texas Supreme Court’s language from Prasifka, dicta from Dallas County Flood Control Dist. No. 1 v. Cross, 815 S.W.2d 271, 284 (Tex.App.-Dallas 1991, writ denied), suggests estoppel would interfere with the exercise of a city’s governmental functions if it would erect a legal barrier to the city carrying out its governmental functions in the future. On the other hand, estoppel would not interfere with the exercise of a city’s governmental functions if the landowner had been using the land for some time without objection from the city. See Krause, 106 S.W. at 123 (landowner’s house stood on property for over twenty years before city enforced boundary); Rosenthal I, 211 S.W.2d 279 (landowner used property as meat storage facility for year and a half before city sought to enforce zoning law). We do not suggest these are the only factors a trial court could properly consider in making this determination.
In the present case, Maguire sought damages associated with its expenditures to prepare the drill site. Monetary damages would not prevent the City from operating Lake Houston in the future or place the City’s drinking water at risk. In fact, assuming Maguire’s well would threaten the City’s drinking water, money damages are a superior remedy to enforcement of the permit. However, even if Maguire had sought the removal of the City’s stop work order, summary judgment would still have been inappropriate, because Maguire presented summary judgment proof of other wells that have been drilled within 1,000 feet of Lake Houston.
Finally, Maguire’s summary judgment proof raises a fact issue concerning each element of equitable estoppel. Maguire’s summary judgment proof establishes that the City issued Maguire three permits, that Maguire relied on the City’s conduct in issuing the permits by expending substantial funds, and that, later, city officials revoked the permit and issued Maguire a stop work order. Therefore, the City *369 failed to refute Maguire’s estoppel defense. Summary judgment was inappropriate on Maguire’s claims for negligent misrepresentation and promissory estoppel based on sovereign immunity.
The City also contends that, notwithstanding the availability of sovereign immunity, Maguire’s negligent misrepresentation and promissory estoppel claims fail as a matter of law. The elements of negligent misrepresentation are: (1) a defendant makes a representation in the course of business or a transaction in which the defendant has a pecuniary interest; (2) the defendant supplies “false information” for the guidance of others in their business; (3) the defendant did not exercise reasonable care or competence in obtaining or communicating the information; and (4) the plaintiff suffers pecuniary loss by justifiably relying on the representation. Fed. Land Bank Ass’n of Tyler v. Sloane, 825 S.W.2d 439, 442 (Tex.1991); Facciolla v. Linbeck Constr. Corp., 968 S.W.2d 435, 442 (Tex.App.-Texarkana 1998, no pet.). The City contends any alleged misrepresentation had to occur in the course of a business or pecuniary transaction and the issuance of a drilling permit is not a business transaction.
However, we have already concluded that the language of Section 23-102 does not prohibit Maguire from drilling and that the City has not alleged Maguire failed to comply with the formalities for obtaining a permit; therefore, the permit was valid. Summary judgment was appropriate on Maguire’s negligent misrepresentation claim.
The elements of promissory estoppel include: (1) a promise; (2) foreseeability of reliance by the promisor; and (3) substantial reliance by the promisee to his detriment. English v. Fischer, 660 S.W.2d 521, 524 (Tex.1983). Maguire’s promissory estoppel claim is based on the permit, which it contended induced it to expend substantial funds to prepare the site for drilling. The City contends a permit is not a promise.
In Shelby Operating Co. v. City of Waskom, 964 S.W.2d 75, 80 (Tex.App.-Texarkana 1997, pet. denied), this Court held,
If the ordinance requires that a drilling permit be obtained before a well is commenced and also prescribes the conditions which must be met, the granting of a permit is a ministerial act and is not discretionary. Accordingly, if the provisions of the ordinance are met, the permit must be issued and cannot be revoked,
citing 5 Eugene Kuntz, Oil and Gas § 68.3 (1991). See also Ex parte Mata, 925 S.W.2d 292, 295 (Tex.App.-Corpus Christi 1996, no writ) (“The granting of licenses and permits are generally held to be privileges and not rights, although if one meets the criteria set in order to obtain a permit or license, it may not be lawfully refused. It becomes a right.”). Our language in Shelby regarding revocation of a permit must be limited when there is language in the ordinance itself governing the terms of revocation or when city officials, acting under the city’s inherent police powers, determine drilling is endangering the public health, morals, safety, or welfare. See Trevino & Gonzalez Co., 949 S.W.2d at 42, citing Leach v. Coleman, 188 S.W.2d 220, 224-25 (Tex.Civ.App.-Austin 1945, writ ref'd w.o.m.), and Tex. TRAnsp. Code Ann. § 316.004 (Vernon 1999) (empowering cities to include “a provision that authorizes the governing body, at its discretion, to terminate the permit without notice to the permit holder” in an ordinance establishing permit program).
The City cites the court’s statement in Trevino that, “A building permit is simply a revocable and alterable license authoriz *370 ing construction.” Trevino & Gonzalez Co., 949 S.W.2d at 42. That statement was made in the context of the court’s holding that a permit is not a contract. Id. However, promissory estoppel applies when a promise is not enforceable in contract. 31 C.J.S. Estoppel and Waiver § 92 (1996).
In the present case, the City issued Maguire three permits, which vested it with the right to drill. That right was not revocable except under the terms of the ordinance or if city officials determined Maguire’s drilling was affecting the public health and safety. As such, it was a promise to allow Maguire to drill under the terms of the governing ordinances so long as its activities did not endanger the public welfare. There is no summary judgment proof showing under what conditions a drilling permit may be revoked under the Houston Code of Ordinances. There is also no summary judgment proof showing Maguire’s activities were a threat to the public welfare. In fact, Maguire’s summary judgment proof shows the existence of other wells located the same distance from Lake Houston as Maguire’s lease. Therefore, summary judgment was inappropriate on Maguire’s promissory estop-pel claim.
Selective Enforcement Claim
Maguire next contends the trial court erred by rendering a no-evidence summary judgment against its selective enforcement claim. As a general rule, an ordinance is not rendered either invalid or inoperative by the failure of officials to enforce it on other occasions. 9 McVicker, 510 S.W.2d at 145; see also T & R Assocs. v. City of Amarillo, 688 S.W.2d 622, 630 (Tex.App.-Amarillo 1985, writ ref'd n.r.e.) (“The fact that a city official or employee fails in certain particulars to enforce a zoning regulation cannot render it invalid.”). Maguire contends, however, Section 23-102 has been discriminatorily applied. 10
The City contends that, because Maguire did not make a showing it was part of a protected class, it cannot recover. The City’s position is based on a series of decisions culminating in State v. Malone Serv. Co., 829 S.W.2d 763 (Tex.1992). In that case, the Texas Supreme Court held that, to establish a claim of discriminatory enforcement, a party must first show he or she has been singled out for prosecution or enforcement of the regulation or ordinance while others similarly situated and committing the same acts have not. Id. at 766; see also United States v. Rice, 659 F.2d 524, 526 (5th Cir.1981); Wolf v. State, 661 S.W.2d 765, 766 (Tex.App.-Fort Worth 1983, writ ref'd n.r.e.). Further, the party must also show the government has purposefully discriminated on the basis of an impermissible consideration such as race, religion, or the desire to prevent the exercise of constitutional rights. Malone Serv. Co., 829 S.W.2d at 766; see Rice, 659 F.2d at 526; Wolf, 661 S.W.2d at 766.
Both Malone Service Company and Rice involved claims not raised by specially protected groups. Malone Service Company involved a claim by a hazardous waste disposal plant operator about enforcement of an environmental regulation, Malone Serv. Co., 829 S.W.2d at 765; Rice involved a claim the Internal Revenue Service was *371 selectively enforcing the tax code against a group of tax protesters because of their exercise of their right to protest. Rice, 659 F.2d at 526. Both the Texas Supreme Court in Malone Service Company and the Fifth Circuit in Rice concluded the defendants failed to show the government had an invidious motivation for enforcing the law (e.g., one based on race, ethnicity, religion, gender, or the desire to prevent the exercise of constitutional rights). Rice, 659 F.2d at 527; Malone Serv. Co., 829 S.W.2d at 767.
The City contends Maguire has not shown it is in a protected group and, therefore, it is not entitled to raise an equal protection argument. The United States Supreme Court recently addressed a situation where a municipality refused to connect a water line to the plaintiffs property unless the plaintiff granted it a thirty-three-foot easement, rather than the fifteen-foot easement required of her neighbors. Vill. of Willowbrook v. Olech, 528 U.S. 562, 563, 120 S.Ct. 1073, 145 L.Ed.2d 1060, 1062 (2000). The Court, reiterating earlier cases, recognized a cognizable equal protection claim brought by a “class of one,” where the plaintiff alleges that he or she has been intentionally treated differently from others similarly situated and that there is no rational basis for the difference in treatment. Id., 528 U.S. at 564, 120 S.Ct. 1073, citing Sunday Lake Iron Co. v. Township of Wakefield, 247 U.S. 350, 352, 38 S.Ct. 495, 62 L.Ed. 1154, 1155-56 (1918). In Sunday Lake Iron, the Court wrote:
The purpose of the equal protection clause of the Fourteenth Amendment is to secure every person within the State’s jurisdiction against intentional and arbitrary discrimination, whether occasioned by express terms of a statute or by its improper execution through duly constituted agents.... It is also clear that mere errors of judgment by officials will not support a claim of discrimination. There must be something more — something which in effect amounts to an intentional violation of the essential principle of practical uniformity. The good faith of such officers and the validity of their actions are presumed; when assailed, the burden of proof is upon the complaining party.
Sunday Lake Iron Co., 247 U.S. at 352-53, 38 S.Ct. 495 (citation omitted).
Olech teaches that a party may be able to maintain an equal protection claim, even though he or she does not belong to a protected class. At a summary judgment hearing, a party must present some evidence that he or she was intentionally treated differently than others who are similarly situated and that there is no rational basis for the differential treatment. See Harlen Assocs. v. Inc. Vill. of Mineola, 273 F.3d 494, 500 (2d Cir.2001); Am. Fabricare v. Township of Falls, 101 F.Supp.2d 301, 309 n. 14 (E.D.Pa.2000).
After Olech, the federal courts have grappled with the role of the defendant’s motive in “class of one” equal protection cases. In Hilton v. City of Wheeling, 209 F.3d 1005, 1008 (7th Cir.2000), the Seventh Circuit stated “the role of motive is left unclear” in Olech and held the United States Supreme Court’s requirement the plaintiff prove there is no rational basis for the differential treatment means the plaintiff must demonstrate “the defendant deliberately sought to deprive [the plaintiff] of the equal protection of the laws for reasons of a personal nature unrelated to the duties of the defendant’s position.” See also Bartell v. Aurora Pub. Sch., 263 F.3d 1143, 1149 (10th Cir.2001) (taking a similar position); Shipp v. McMahon, 234 F.3d 907, 915 (5th Cir.2000) (same). However, in Olech, the United States Supreme *372 Court held the plaintiffs complaint, which alleged the defendant intentionally demanded an “irrational and wholly arbitrary” thirty-three-foot easement, but later settled for a “clearly adequate” fifteen-foot easement, was sufficient to state a claim for relief “quite apart from the Village’s subjective motivation.” Olech, 528 U.S. at 565, 120 S.Ct. 1073.
Regardless of whether a plaintiff must prove the differential treatment was motivated by animus, we conclude Maguire presented sufficient summary judgment proof to raise a fact issue on its equal protection claim. Maguire offered the affidavit of James D. Wilson, who stated he reviewed topographical maps of the area and Texas Railroad Commission documents and discovered twenty-one wells “drilled after 1967, inside the city limits of Houston, and within 1000 feet of Lake Houston’s drains, streams or tributaries.” He also stated he was able to visually confirm the location of six of these wells. Of the twenty-one wells, all but four are operated by a single company.
This proof, though admittedly circumstantial, is sufficient to raise a fact question concerning whether the City intentionally enforced Section 23-102 against Maguire differently than against other companies. Further, because the other wells are similarly situated to the one Ma-guire sought to drill, the summary judgment proof is sufficient to raise a fact issue concerning whether the City had a rational basis for enforcing Section 23-102 differently. Finally, assuming Maguire is required to prove the City acted with animus, the summary judgment proof is sufficient to raise a fact issue because the proof shows the differential enforcement disproportionately favors a single company. Therefore, summary judgment was inappropriate on Maguire’s selective enforcement cause of action.
Conclusion
Summary judgment was appropriate on Maguire’s negligent misrepresentation claim. However, summary judgment was inappropriate on Maguire’s inverse condemnation claim, its claim for reliance damages based on promissory estoppel, and its selective enforcement claim. Therefore, we affirm the trial court’s judgment in part, reverse in part, and remand for further proceedings.
. A full list of plaintiffs is as follows: (1) Maguire Oil Company; (2) Maguire Energy Company; (3) Cary M. Maguire, individually; (4) Cary M. Maguire as manager for the Oil Fund, a Texas joint venture; (5) Cary M. Maguire as trustee of the Cary M. Maguire, Jr., Melinda Ambler Maguire, and Ann Blaine Maguire trusts; (6) Don R. Holloway as custodian of property for W. Matthew Holloway, Barbara Ann Holloway, and Tillman R. Holloway under the Texas Uniform Transfers to Minors Act (TUTTMA), see Tex. Prop.Code Ann. §§ 141.001-.025 (Vernon Supp.2002); and (7) William N. Collins as custodian of property for L. Paige Collins, Hattie S. Collins, and Chandler Collins under the TUTTMA. Each of the plaintiffs (except Cary M. Maguire as trustee) is either a working interest holder in, or a royalty owner and lessor of, one or more of the oil, gas, and mineral leases the subject of this suit.
. The Texas Local Government Code defines extraterritorial jurisdiction as the unincorporated area that is contiguous to the corporate boundaries of the city and that is located within five miles of those boundaries if the city has 100,000 or more inhabitants. Tex. Loc. Gov't Code Ann. § 42.021(5) (Vernon 1999).
. Maguire abandoned its discrimination claim at the hearing on the City’s second motion for summaiy judgment.
. There is no specific statute of limitations for an inverse condemnation claim. However, courts have held the ten-year statute of limitations to acquire land by adverse possession applies. Trail Enters., Inc. v. City of Houston, 957 S.W.2d 625, 631 (Tex.App.-Houston [14th Dist.] 1997, pet. denied); see also Tex.Civ. Prac. & Rem.Code Ann. § 16.026(a) (Vernon Supp.2002); Brazos River Auth. v. City of Graham, 163 Tex. 167, 354 S.W.2d 99, 110 (1961); Waddy v. City of Houston, 834 S.W.2d 97, 102 (Tex.App.-Houston [1st Dist.] 1992, writ denied); Hudson v. Arkansas Louisiana Gas Co., 626 S.W.2d 561, 563 (Tex.App.—Texarkana 1981, writ ref'd n.r.e.); Hubler v. City of Corpus Christi, 564 S.W.2d 816, 823 (Tex.Civ.App.-Corpus Christi 1978, writ ref'd n.r.e.).
. Maguire also relies on dicta from Haupt, Inc. v. Tarrant County Water Control & Improvement Dist. Number One, 833 S.W.2d 697, 699-700 (Tex.App. -Waco 1992), rev’d on other grounds, 854 S.W.2d 909 (Tex.1993), in which expert testimony was introduced to establish the value of minerals in place on condemned land. However, Haupt does not provide sufficient insight into the methods the expert witness used to value the minerals. For example, did the expert use sales of comparable mineral interests, a discounted cash flow analysis of the revenues that could be earned from the minerals, or as Maguire attempted to do in this case, sales of the reserves in the ground? In addition, Haupt dealt with “proven” reserves from producing fields. Other cases we have reviewed suffer from these same deficiencies. See Tarrant County Water Control & Improvement Dist. Number One v. Fullwood, 963 S.W.2d 60, 61 (Tex.1998) (Hecht, J., dissenting from denial of application for writ of error) ("[T]he [trial] court awarded Fullwood $60,000 for what the jury found to be the value of his royalty interest at the time the District plugged the wells, based on the anticipated future economic productive life of the oil reserves.”); Trinity River Auth. v. Chain, 437 S.W.2d 887, 889 (Tex.Civ.App.-Beaumont 1969, writ ref'd n.r.e.) (where jury was asked to determine "reasonable market value of the minerals under the 280.64 acres of land being condemned”); City of Teague v. Stiles, 263 S.W.2d 623, 628, 630 (Tex.Civ.App. -Waco 1953, writ ref'd n.r.e.) (holding witness competent to testify "as to the market value of the royalty under the land; that the value of the royalty under the lake would be depreciated; and that the spacing rule of the Railroad Commission is one well per 40 acres”).
. In fact, Justice Looney dissented on rehearing and Chief Justice Bond concurred, making the opinion on original submission the dissenting opinion and the dissenting opinion on rehearing the majority opinion. See Rosenthal v. City of Dallas, 211 S.W.2d 279, 294-95 (Tex.Civ.App.-Dallas 1948, writ ref'd n.r.e.) (Bond, C.J., concurring on reh’g).
. The estoppel doctrine applied in Rosenthal is also closely akin to quasi-estoppel, which is a species of equitable estoppel and is itself an equitable doctrine. See Cook Composites, Inc. v. Westlake Styrene Corp., 15 S.W.3d 124, 136 (Tex.App.-Houston [14th Dist.] 2000, pet. dism’d); 31 C.J.S. Estoppel and Waiver § 120 (1996); see also 31 id. § 59 (1996) (“Insofar as conduct amounts to, and is considered as, a representation, it is dealt with in this chapter together with other matters constituting representations; but insofar as conduct inconsistent with a right subsequently asserted is viewed as a form of quasi estoppel, it is dealt with in the chapter on quasi estop-pel. ...”). Compare 31 id. §§ 58-119, with 31 id. §§ 120-152. Quasi-estoppel precludes a party from asserting, to another’s disadvantage, a right inconsistent with, a position previously taken. Lopez v. Munoz, Hockema & Reed, L.L.P., 22 S.W.3d 857, 864 (Tex.2000). It applies when it would be unconscionable to allow a person to maintain a position inconsistent with one to which he acquiesced, or from which he accepted a benefit. Id. Unlike equitable estoppel by conduct, however, quasi-estoppel requires no showing of a false representation or of detrimental reliance. Stable Energy, L.P. v. Newberry, 999 S.W.2d 538, 548 (Tex.App.-Austin 1999, pet. denied).
. Arguably, Maguire could invoke estoppel even if Section 23-102 prohibited it from drilling. Houston Code of Ordinances Section 31-30, which Maguire offered as summary judgment proof, requires a building official to issue a permit if (1) the permit application is found to comply with Houston Code of Ordinances Chapter 31, and (2) the well is not prohibited by Chapter 31. Houston, Tex, Code of Ordinances § 31-30 (1990). Arguably, Section 31-30 creates a fact issue concerning the authority of city officials to issue a permit for drilling in a location prohibited by Section 23-102. However, we believe Section 31-30 must be read in conjunction with the restrictions on drilling in Section 23-102. From this we conclude the City did not authorize city officials to issue a drilling permit for a site where drilling would be prohibited under Section 23-102.
. Eunice A. Eichelberger, Annotation: Enforcement of Zoning Regulation as Affected by Other Violations, 4 A.L.R.4& 462 (1981).
. The concept of discriminatory enforcement is based on the constitutional guarantee of equal protection under the law. State v. Malone Serv. Co., 829 S.W.2d 763, 766 (Tex.1992). The defense originated in the context of criminal prosecutions, but courts in this state have held the governing principles also apply to civil proceedings involving state agencies. Id.
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