OPINION
John Donovan, JusticeLitigation of the matter underlying this case began in 2004. In its current- form, Carroll G. Robinson, Bruce R. Hotze, and Jeffrey N. Daily1 filed suit in April 2014 against Annise D. Parker, as Mayor of the City of Houston,2 and the City of Houston (collectively “the City”), seeking declaratory and injunctive relief. The City subsequently filed a plea to the jurisdiction and, subject to. the plea, a motion for summary judgment. Both were denied' by the' trial court in an order signed May 2, 2016. From the denial of its plea, the City brings this appeal. The City contends appellees lack standing to bring this suit and governmental immunity has not been waived as to either the City of Houston or the May- or. We conclude appellees have standing as taxpayers and the City has not conclusively proved the trial court lacks subject matter jurisdiction. We therefore affirm the trial court’s order.
Background
. The. City approved an ordinance placing two propositions for amendments to the city charter on the ballot in a November 2004 election: ‘ “Prop, 1” and “Prop. 2.”3
*119Prop. 1 was placed on the ballot pursuant to the City’s own motion. Prop.-1 pertains to “Limits on Annual Increases in City Property Taxes and Utility Rates.” Prop. 1 grants the City “full authority to assess and collect any and all revenues of the city without limitation, except as to ad valorem taxes and water and sewer rates.” Although the full text of Prop. 1 was set forth in the election ordinance, the following summary was included on the ballot:
The' Charter of the City of Houston shall be amended to require voter approval before property tax revenues may be increased in any future fiscal year above a limit measured by the lesser of 4.5% or the cumulative combined rates of inflation and population growth. Water and sewer rates would not increase more than the cumulative combined rates of inflation and population growth without prior voter approval. The Charter Amendment also requires minimum annual increases of 10% in the senior and disabled homestead property tax exemptions through the 2008 tax year.
Prop. 2 resulted from a citizen-initiated referendum petition. Prop. 2 concerns “Limits on All Combined City Revenues.” Although the full text of Prop. 2 was set forth in the election ordinance, the following summary was included on the ballot:
The City Charter of the City of Houston shall be amended to require voter approval before the City may increase total revenues from all sources by more than the combined rates of inflation and population, without requiring any limit of any specific revenue source, including water and sewer revenues, property taxes, sales taxes, fees paid by utilities and developers, user fees, or any other sources of revenues.
On the November 2004 ballot, the electorate was allowed to vote for or against each proposition. Prop. 1 and Prop. 2 each passed with a majority of the votes cast on the particular proposition. Prop. 1 received more favorable votes than Prop. 2. "
After the election, for two independent reasons, the City determined Prop. 1 is legally binding and Prop. 2 would not be enforced. First, in the election ordinance, the following “poison pill” provision was included after the text of Prop. 1:
If another proposition for a Charter amendment relating to limitations on increases in City revenues is-approved at the same election at which this proposition is also approved, and if this proposition receives the higher number of favorable votes, then this proposition shall prevail and the other shall-not become effective.
Citing this provision, the City asserted Prop. 1 must prevail because it received more favorable votes than - Prop. 2. Alternatively, the City relied on Article IX, Section 19 of the Houston City Charter providing, in pertinént part:
... at any election for the adoption of amendments if the provisions of two or more proposed amendments approved at said election are inconsistent the* amendment'receiving the highest number- of votes shall prevail.
The City posited that Prop. 1 and Prop. 2 are inconsistent and Prop. 1 prevails because it received more favorable votes.4
*120In a prior case, appellees sued the City, seeking a declaratory judgment that Prop. 1 and Prop. 2 must both be added to the City Charter. The City filed a plea to the jurisdiction, followed by a supplemental plea, contending, inter alia, that appellees lacked standing. The City also filed a motion for summary judgment and a supplemental motion. The trial court denied the City’s plea to the jurisdiction and motion for summary judgment. Subsequently, the trial court denied the City’s request for reconsideration of its motion for summary judgment. Appellees also filed a motion for summary judgment which the trial court granted. The trial court then signed a final judgment from which the City appealed. The trial court specifically expressed no opinion on the validity of Prop. 2. That issue was presented in the City’s appeal to this court but was not reached. See White v. Robinson, 260 S.W.3d 463 (Tex. App.— Houston [14th Dist.] 2008), vacated sub nom. Robinson v. Parker, 353 S.W.3d 753 (Tex. 2011). We held appellees lacked standing to challenge the City’s post-election interpretation of the two propositions based on their working to place the proposition on the ballot, contributing to the campaign for the proposition, and voting for Proposition 2. Id. at 473. We remanded the case to the trial court to allow appel-lees an opportunity to replead and establish standing. Id. at 476.
Appellees appealed our decision to the Texas Supreme Court where our judgment was vacated and the case dismissed on the grounds the claims were not ripe. See Robinson v. Parker, 353 S.W.3d 753, 756 (Tex. 2011). The court noted the record was silent as to whether the City had failed to comply with the Prop. 2 spending caps and that then-mayor .Bill White had stated his intention to comply with the caps. Id. at 755-56. Because there was nothing in the record indicating the City had actually failed or would soon fail to comply with Prop. 2’s spending caps, the case was not ripe and the trial court lacked jurisdiction. Id. at 756.5 Accordingly, the judgments of our court and the trial court were vacated and the case dismissed for want of jurisdiction. Id. The court expressly declined to opine as to whether, if the case were ripe, appellees would have standing to bring their declaratory judgment claims. Id.
On the same day that suit was filed, appellees sought writs of mandamus that were assigned to the First Court of Appeals complaining that the City failed to perform certain ministerial duties with respect to the election. See In re Robinson, 175 S.W.3d 824, 826-27 (Tex. App.—Houston [1st Dist.] 2005, orig. proceeding). The court held the Mayor had a non-discretionary duty to certify all the amendments, including Prop. 2, to the Secretary of State. Id. at 829-30 (citing Tex. Loc. Gov’t Code Ann. § 9.007(a) (West 2008)).6 The court also held that City Council had a non-discretionary duty to enter an order in the city records declaring all the propositions had been adopted by voters. Id. at 830-32 (citing Tex. Loc. Gov’t Code Ann. § 9.005 (West 2008)).7 The city council *121passed an ordinance recognizing that both Prop. 1 and Prop. 2 had passed, thus both propositions became part of the Houston City Charter, and declaring that Prop. 1 had received the higher number of.- votes. See Robinson, 353. S.W.3d at 754 (citing Hous., Tex., Code Ordinances, City Charter art. Ill, § 1; art. Vl-a, § 7; art. IX, § 20 (2006)).
In July 2008—our opinion in White v. Robinson, 260 S.W.3d 463, issued in April 2008—Hotze petitioned this court for a writ of mandamus to -compel the city to furnish written verification that its budget complied with the city charter. In re Hotze, 14-08-00421-CV, 2008 WL 4380228 (Tex. App.—Houston [14th Djst.] July 10, 2008, no pet.) (mem. op.). We determined Hotze lacked standing under section 273.061 of the Election Code. We did not address Hotze’s claim that he.had taxpayer standing because the petition did not invoke our limited jurisdiction to compel an action by a district or county court, or to enforce this court’s jurisdiction. Id. (citing Tex. Gov’t Code § 22.221),
Also during this time, the Mayor and the City Council approved putting two new propositions, Propositions G and H, on the November 7/2006, ballot. Proposition G revised the calculation for the city charter’s limitations on the City’s revenues.8 Proposition' H permitted the City to raise revenues for police^ fire, and emergency services in excess of the revenues allowed under any revenue limitations contained in the city charter.9
On November 3, 2006, Hotze filed a declaratory judgment action against the City seeking a declaration that Proposition G, as it was to appear on the ballot in the November 7, 2006 election, was “illegal and invalid as a matter of law.” See Tex. *122Elec. Code §• 221.002, 233.006(a)-(b). The City subsequently filed a Plea to the Jurisdiction, and then an Amended Plea to the Jurisdiction, arguing that the trial court did not have , subject matter jurisdiction over this action because Hotze’s claims were time-barred by/the Texas Election-Code. Id, The trial court granted the City’s amended plea to the jurisdiction as to all of Hotze’s claims. "
Hotze appealed. Hotze v. White, 01-08-00016-CV, 2010 WL ,1493115, at *2-3 (Tex. App.—Houston [1st Dist.] Apr. 15, 2010, pet. denied) (mem. op.). The First. Court of Appeals held the trial court lacked subject matter jurisdiction to hear any claims challenging the facial validity of Propositions G and H on the' ballot and Hotze lacked standing to maintain' his suit. Id. at *5-7. The court reversed the ‘trial court’s judgment and remanded to allow Hotze’ an opportunity to re-plead. Id. at *8.
Appellees subsequently filed the suit underlying this appeal requesting a declaratory judgment and injunctive relief regarding the validity of Prop. 2 and the City’s future compliance with both, Prop. 1 and Prop. 2. The trial court denied the City’s plea to thé jurisdiction and this appeal ensued. The City claims the trial court erred in denying the plea for two reasons: appellees lack standing and appellants’ immunity has not been waived. After setting forth the proper standard of review, we address each in turn.
Standard op Review
A plea to the jurisdiction is a dilatory plea that seeks dismissal of a case for lack ,of subject matter jurisdiction. Harris Cty. v. Sykes, 136 S.W.3d 635, 638 (Tex. 2004); Bland Indep. Sch. Dist. v. Blue, 34 S.W.3d 547, 554 (Tex. 2000)Whether a court has subject matter jurisdiction is a question of law. Terns Dep’t of Parks & Wildlife v. Miranda, 133 S.W.3d 217, 226 (Tex. 2004); Texas-Natural Res. Conservation Comm’n v. IT-Davy, 74 S.W.3d 849, 855 (Tex. 2002). Whether a party has alleged - facts that affirmatively • demonstrate a trial court’s subject matter jurisdiction and whether undisputed evidence of jurisdictional facts establishes a trial court’s jurisdiction are questions of law reviewed de novo. Miranda, 133 S.W.3d at 226, However, in some cases, disputed evidence of jurisdictional facts that also implicate the merits of the case may require resolution by the finder of fact. Id., (citing Gates v. Pitts, 291 S.W. 948, 949 (Tex. Civ. App.—Amarillo 1927, no writ)).
When a plea to the jurisdiction challenges the pléadings, wé determine if the pleader has alleged facts that affirmatively demonstrate the court’s'jurisdiction to hear the cause Miranda, 133 S.W.3d at 226 (citing Texas Ass’n of Bus., 852 S.W.2d at 446). We construe the pleadings liberally in favor of the plaintiff and look to the pleader’s intent. Id. If the pleadings do not contain sufficient facts to affirmatively demonstrate’the trial court’s jurisdiction but do not affirmatively demonstrate, incurable defects in jurisdiction, the issue is one of pleading sufficiency, and the plaintiff should be, afforded the opportunity to amend. Miranda, 133 S.W.3d at 226-27 (citing County of Cameron v. Brown, 80 S.W.3d 549, 555 (Tex. 2002)). If the pleadings affirmatively negate the existence of jurisdiction, then a plea to the jurisdiction may be granted without allowing the plaintiff an opportunity to amend. Id. at 227.
If a plea to the jurisdiction challenges the existence of jurisdictional facts, we consider relevant evidence submitted by the parties when necessary to resolve the jurisdictional issues raised, as the trial court is required to do. Miranda, 133 S.W.3d at 227 (citing Bland, 34 S.W.3d at 555). In a case in which the jurisdictional *123challenge implicates the merits of the plaintiffs cause of action and the plea to ' the jurisdiction includes evidence, the trial court reviews the relevant evidence to determine if a fact issue exists. Id. If the relevant evidence is undisputed or fails to raise a fact question, the trial court rules on the plea as a matter of law. Id. at 228.
The standard of review for a plea to the jurisdiction based on evidence “generally mirrors that of a' summary judgment under Texas Rule of Civil Procedure 166a(c).” Miranda, 133 S.W.3d at 228; see also Thornton v. Ne. Harris Cty. MUD 1, 447 S.W.3d 23, 32 (Tex. App.— Houston [14th Dist.] 2014, pet. denied). Under this standard, we take as true all evidence' favoring the non-movant and draw all reasonable inferences and resolve any doubts in the non-movant’s favor. Miranda, 133 S.W.3d at 228. If the movant presents conclusive proof that the trial court lacks subject matter jurisdiction, then the non-movant must present evidence sufficient to raise a material issue of fact regarding jurisdiction, or the plea will be sustained. See id.; City of Galveston v. Murphy, No. 14-14-00222-CV, 533 S.W.3d 355, 358-59, 2015 WL 167178, at *2 (Tex. App.—Houston [14th Dist.] Jan. 13, 2015, pet. denied).
Standing
In their first issue, the City contends' appellees lack standing to bring their claims. In their petition, appellees asserted standing by virtue of their .participation in the passage of Prop. 2, .that Prop. 2 confers standing on them, and they have standing as taxpayers. We first address the question of taxpayer standing,
Standing is a constitutional prerequisite to maintaining suit. Tex. Dep’t of Transp. v. City of Sunset Valley, 146 S.W.3d 637, 646 (Tex. 2004) (citing Tex. Ass’n of Bus., 852 S.W.2d at 444). Standing is determined at the time suit is filed in the trial court. See Tex. Ass’n of Bus., 852 S.W.2d at 446 n. 9 (citing Carr v. Alta Verde Indus., Inc., 931 F.2d 1055, 1061 (5th Cir, 1991)); see also Kitty Hawk Aircargo,. Inc. v. Chao, 418 F.3d 453, 458 (5th Cir. 2005) (standing determined as of commencement of suit). Except for issues involving mootness, subsequent events do not deprive the court of subject matter jurisdiction. See Texas Ass’n of Bus., 852 S.W.2d at 446 n. 9. As a general rule, unless standing is conferred by statute, a plaintiff must demonstrate that he possesses an interest in a conflict distinct from that of the general public, such that the defendant’s actions have caused the plaintiff some particular injury. Williams v. Lara, 52 S.W.3d 171, 178-79 (Tex. 2001) (citing Hunt v. Bass, 664 S.W.2d 323, 324 (Tex. 1984)).
Taxpayers, however, fall under a limited judicial exception to this general rule. Williams, 52 S.W.3d at 179-80 (citing Bland, 34 S.W.3d at 556); see also Lone Star Coll. Sys. v. Immigration Reform Coal. of Tex. (IRCOT), 418 S.W.3d 263, 274 (Tex. App.—Houston [14th Dist.] 2013, pet. denied). Taxpayers in Texas generally have standing to enjoin the'illegal expenditure of public funds and need not demonstrate a particularized injury. Williams, 52 S.W.3d at 179; Bland, 34 S.W.3d at 556; Calvert v. Hull, 475 S.W.2d 907, 908 (Tex. 1972); Osborne v. Keith, 142 Tex. 262, 177 S.W.2d 198, 200 (Tex. 1944). Implicit in this rule are two requirements: (1) that the plaintiff is a taxpayer; and (2) that, public funds are being expended on the allegedly illegal activity. Williams, 52 S.W.3d at 179; Bland, 34 S.W.3d at 556; Calvert, 475 S.W.2d at 908; Osborne, 177 S.W.2d at 200. A taxpayer may maintain an action solely to challenge proposed illegal expenditures; he or she may not sue to recover funds previously expended or challenge expendí-*124tures that are merely “unwise or indiscreet.” Williams, 52 S.W.3d at 180 (citing Hoffman v. Davis, 128 Tex. 503, 100 S.W.2d 94, 96 (Tex. 1937), and Osborne, 177 S.W.2d at 200). Underpinning these limitations is the realization that “governments cannot operate if every citizen who concludes that a public official has abused his discretion is- granted the right to come into court and bring such official’s public acts under judicial review.” Id. (quoting Osborne, 177 S.W.2d at 200, and citing Bland, 34 S.W.3d at 555). As a component of subject-matter jurisdiction, we review a claimant’s standing de novo. City of Sunset Valley, 146 S.W.3d at 646; Texas Ass’n of Bus., 852 S.W.2d at 445.
By their suit, appellees’ do not seek to recover funds previously -expended but to restrain future collection and spending of illegal taxes and reimbursement of illegally collected, but unspent, taxes. In Calvert v. Hull, 475 S.W.2d 907, 908 (Tex. 1972), the Texas Supreme Court found plaintiffs had taxpayer standing to seek injunctive and declaratory relief. The Calvert court relied upon Terrell v. Middleton, 187 S.W. 367, 369 (Tex. Civ. App.—San Antonio 1916), writ denied, 108- Tex. 14, 191 S.W. 1138 (1917), which held “[cjitizens are allowed to prevent, by injunction, the collection of illegal taxes.” Terrell was “the famous ‘chicken salad’ case wherein private citizens were held to have standing to sue the State Comptroller, Middleton,, to enjoin the expenditure of appropriated funds to pay for chicken salad and other items of ‘public’ entertainment at the mansion by Governor Colquitt.” Calvert, 475 S.W.2d at 908. At the time, “[t]he constitution then read that the governor should receive annually $4,000 ‘and no more.’ The chicken salad expenditure was held to be an unconstitutional increase in the emolument of the governor.” Id.
Similarly, in this case, appellees seek injunctive and declaratory relief to prevent the future collection and expenditure of funds in excess of the caps imposed by the passage of Prop. 1 and Prop. 2. In accordance with Terrell and Calvert, we conclude appellees have standing as taxpayers and overrule the City’s third issue. It is therefore unnecessary to address the City’s first and second issues challenging appellees’ standing on other grounds.,
' Immunity
Sovereign immunity protects the State and its political subdivisions from lawsuits for damages unless immunity has been waived by the Legislature. Tex. Parks & Wildlife Dep’t v. Sawyer Trust, 354 SW.3d 384, 388 (Tex, 2011); Reata Constr. Corp. v. City of Dallas, 197 S.W.3d 371, 374 (Tex. 2006). Sovereign immunity from suit deprives a trial court of subject matter jurisdiction and is properly asserts ed in a plea to the jurisdiction. Reata, 197 S.W.3d at 374; Miranda, 133 S.W.3d at 225-26. However, the Texas Supreme Court has recognized that .sovereign immunity does not bar a suit in at least two relevant circumstances: (1) when the suit seeks to determine or protect a party’s rights against a government official who has acted without legal or statutory authority—commonly referred to as an ultra vires claim; or (2) when the suit challenges the validity of a statute.
In their second amended petition, appel-lees assert the Mayor is not immune from suit under the first circumstance. Appel-lees further contend the City of Houston is not immune under the second circumstance because it is a necessary party under the Uniform Declaratory Judgments Act (“the Act”). Before addressing each of these arguments, we set forth appellees’ claims.
*125 The Pleadings
Contained within appellees’ petition are the following allegations:
• The Mayor allowed the City of Houston to assess and collect approximately $125 million each year (from 2011 until 2015), and has since allowed the City of Houston to assess and collect approximately $175 mil-’ lion each year (from January 1, 2016 until the present timé);
• The Mayor has publicly announced his intention to continue to assess and collect drainage fees in the future;
• the City has refused to include any drainage charges in their calculation of whether any of the budgets passed from fiscal year (“FY”) 2011 to FY 2017 exceed the caps of Proposition 1 or 2; and
• the City has passed budgets and have assessed, collected and spent, public funds which exceed these caps for each of FY 2011 until FY 2017.
As regards the Mayor’s, ultra vires acts, appellees allege the Mayor acted without legal authority in carrying out his duties:
• in permitting the illegal assessment, collection and expenditure of drainage fees,
• in exempting those drainage fees from the caps in Prop. 1 and Prop. 2;
• in passing budgets for FY 2011 to FY 2017 which exceed the caps and violate the other provisions of Prop. 1 and 2; and
• in expending public monies which exceed the caps in Prop. 1 and Prop. 2.
Appellees pleadings expressly state they are not seeking to recover public funds that have already been spent; reimbursement is only sought for monies that remain unspent. Appellees seek to prevent, through declaratory and injunctive relief:
• the assessment or collection of any future drainage charges;
• the passage of future budgets which exceed the Prop. 1 and Prop. 2 caps;
• the future spending of all collected drainage charges; and
• the future spending of drainage fees or other public monies for any and all annual budgets which fail to comply with Prop. 1 and Prop. 2.
, Specifically, appellees’ request the following declarations:
• The “poison-pill” language was not included in Prop. 1 and was never approved by the electorate;
• Alternatively, the “poison-pill” language is not a' legitimate basis to create a conflict;
• Prop. 1 and Prop. 2 are not inconsistent;
• Prop. 1 and Prop. 2 are valid and constitutional; and
• Alternatively, if Prop. 1 and Prop. 2 are' inconsistent, either Prop. 1 or Article IX, Section 19 of the City Charter are unconstitutional; and
• Alternatively, if Prop. 1 and Prop. 2 are inconsistent, and if neither Prop. 1 nor Article IX, Section 19 of the City Charter are unconstitutional, the portions of Prop. 1 and Prop. 2 that are not inconsistent stand.
■ We now consider whether the record before this court establishes the trial court erred in failing to find these claims against the Mayor and the City of Houston are barred by immunity.
■The Ultra Vires Exception
An ultra vires claim against a government official—that is, a suit against a government official for acting outside his or her authority and seeking to require the official to comply with statutory or consti*126tutional provisions—is not barred by sovereign immunity.- City of El Paso v. Heinrich, 284 S.W.3d 366, 372 (Tex. 2009). To fall within the ultra vires exception, “a suit must not complain of a government officer’s exercise' of discretion, but rather must allege, and ultimately prove, that the officer acted without legal authority or failed to perform a purely ministerial act.” Id. “The ultra vires suit seeks to enforce existing policy, not alter it.” Stiefer v. Moers, No. 14-14-00617-CV, 2015 WL 6950104, at *3 (Tex. App.—Houston [14th Dist.] Nov. 10, 2015, no pet.) (mem. op.) (citing Lone Star Coll. Sys. v. Immigration Reform Coalition of Tex. (IRCOT), 418 S.W.3d 263, 272 (Tex. App.—Houston [14th Dist.] 2013, pet. ref'd) (citing Heinrich, 284 S.W.3d at 372)). To meet the ultra vires exception to governmental immunity, a plaintiff must allege, and ultimately prove, that the officer either acted without legal authority or failed to perform a purely ministerial act. Id. An officer acts without legal authority if he “exceeds the bounds of his granted authority Or if his acts conflict with the law itself.” Houston Belt & Terminal Ry. Co. v. City of Houston, 487 S.W.3d 154 (Tex. 2016). The exception to immunity allows-only prospective declaratory or injunctive relief, not retroactive relief. Heinrich, 284 S.W.3d at 374-77. “As Heinrich made clear, immunity for an ultra vires act is only a waiver with regard to bringing future acts into compliance with the law.” City of Galveston v. CDM Smith Inc., 470 S.W.3d 558, 569 (Tex. App.—Houston [14th Dist.] 2015, pet. denied) (citing Heinrich, 284 S.W.3d at 374).
Appellees seek prospective relief to enforce Prop. .1 and Prop. 2, rather than retroactive relief. The pleadings do not claim the Mayor failed to perform a purely ministerial act but that the Mayor acted without legal authority. Appellees allege facts that, taken as true, and drawing all reasonable inferences and resolving any doubts in their favor, affirmatively demonstrate the trial court’s jurisdiction to hear the cause. See Miranda, 133 S.W.3d at 226-28, In its brief, the City only provides one reference to the record in support of its argument that the acts alleged are not within thé Mayor’s purview. That reference is to Exhibit 2 of their plea which contains,, from the City Charter, page one of Article Vl-a and pages one and six of Article IX. Only the first of these three pages contain any reference to the Mayor and that is section 2, entitled Annual Budget, which provides it is the duty of the mayor to submit a budget to the City Council. The City’s brief does not explain how this evidence conclusively5 negates ap-pellees’ allegations. See Miranda, 133 S.W.3d at 227-28. At best, it raises a fact question, under which circumstancés the trial court cannot grant the plea. Id. at 227-28.
Appellees’ pleadings allegé thé Mayor acted without legal authority." The City has not presented conclusive proof negating those allegations. Accordingly, the record before this court -does not demonstrate the trial court erred in denying the plea to the jurisdiction as to the Mayor. Issue six is overruled.10
The Uniform Declarator Judgments Act
- Under the Act, “[a] person ... whose rights, status, or -other legal relations are .affected by a statute, municipal ordinance, .... or franchise may have de*127termined any question of construction or validity arising under the ... statute, ordinance, ... or franchise and obtain a declaration of rights, status, or other legal relations thereunder.” Tex. Civ. Prac. & Rem. Code § 37.004. Thus, among other relief, a party may seek a declaratory judgment regarding the construction or validity of an ordinance. See id. When declaratory relief is sought, all “persons” who have or claim any interest that would be affected by the declaration must be made parties. Tex. Civ. Prac. & Rem. Code § 37.006(a). The term “person” as used in the Act expressly includes municipal corporations. Id. (stating that “[i]n this chapter, ‘person’ means an individual, partnership, joint-stock company, unincorporated association or society, or municipal or other corporation of any character”). The statute further contains an express waiver of sovereign immunity as follows:
In any proceeding that involves the validity of a municipal ordinance or franchise, the municipality must be made a party and is entitled to be heard, and if the statute, ordinance, or franchise is alleged to be unconstitutional, the attorney general of the state must also be served- with a .copy of the proceeding and is entitled to be heard.
Tex. Civ. Prac. & Rem. Code § 37.006(b). Thus the Act clearly and unambiguously waives the sovereign immunity of municipalities in any declaratory-judgment action involving the validity-of a municipal ordinance. Id.
The City argues appellees are not challenging the validity of a municipal ordinance because they are seeking to have the ordinance declared to be valid, rather than invalid. The City has determined that Prop. 2 is not valid and therefore hot enforceable. Appellees seek to have Prop. 2 declared valid but they are also challenging the validity of Prop. 1, specifically whether the “poison pill” language invalidates. Prop. 2. Further, appellees alternatively plead the unconstitutionality of Prop. 1 and Article IX, Section 19 of the City Charter.
The court’ in Tex. Dep’t of Transp. v. Sefzik recognized “the state may be a proper party to a declaratory judgment action that challenges the validity of a statute.” 355 S.W.3d 618 (Tex. 2011) (citing Heinrich, 284 S.W.3d at 373 n. 6; Tex. Civ. Prac. & Rem. Code § 37.006(b); Wichita Falls State Hosp. v. Taylor, 106 S.W.3d 692, 697-98 (Tex, 2003); Tex. Educ. Agency v. Deeper, 893 S.W.2d 432, 446 (Tex. 1994)). The court’determined Sefzik was not challenging the statute’s validity, but TxDot’s actions under it, and that he “[did] not direct [the court] to any' provision of the UDJA that expressly waives immunity for his claim.” Id.
Here, there is a provision of the. Act that expressly waives a municipality’s immunity for a declaratory-judgment action involving the validity of a municipal ordinance, And while appellees are challenging actions taken under the ordinances, they also seek a. .declaration as to their validity. We must construe the pleadings liberally in favor of appellees. Miranda, 1.33 S.W.3d at 226. In that light, we conclude the City of Houston’s sovereign immunity as to appel-lees’ declaratory judgment action is waived. Issue four is overruled. .
Conclusion
We affirm the trial court’s order.
(Busby, J., joining the Opinion and concurring)
(Brown, J., joining both the Opinion and Concurring Opinion).
. Although counsel informed this court at oral argument that Jeffrey N. Daily had died, no suggestion of death was filed. In light of that, we have not removed his name from the style of this case.
. We substitute Sylvester Turner, in his official capacity, as-successor to Annise D. Parker as Mayor of the City of Houston. See Tex. R, App, P. 7.2(a). The opinion will simply refer to the ''Mayor.”
.“Prop, 3,” relating to the City Controller's role in performing internal audits, was also *119included on the ballot, but this proposition is not at issue in this suit.
, As the City notes, enforcement of only Prop. 1 pursuant to the "poison pill” provision does not require an inconsistency between Prop. 1 and Prop. 2'. In contrast, Article IX, Section 19 of the city charter requires that amendments approved at the same election be inconsistent before the one receiving more votes must prevail.
, As set forth in more detail below, the- current pleadings, on the other hand, allege appellants "have passed budgets and have assessed, collected and spent, public funds which exceed [the caps of Prop.l and Prop. 2] 'for each of [fiscal year] 2011 until [fiscal year] 2017.”
. See Tex. Loc. Gov’t Code Ann. § 9.007(a) (West 2008) ("As soon as practicable after a municipality adopts a charter or charter amendment, the mayor or chief executive officer of the municipality shall certify to the secretary of state an authenticated copy of the charter or amendment under the municipality’s seal showing the approval by the voters of the municipality.”).
.See Tex. Loc. Gov’t Code Ann. § 9.005 (West 2008) (“(a) A proposed charter for a municipality or a proposed amendment to a municipality's charter is adopted if it is ap*121proved by a majority of the qualified voters of the municipality who vote at an election held for that'purpose, (b) A charter or an amendment does not take effect until the governing body of the municipality enters an order in the records of the municipality declaring that the charter or amendment is adopted.”).
. Proposition G read as follows:
Exclusions from limits on City revenues.
(a) Revenues of enterprise funds are not included' in revenues limited by this Charter. The preceding provisions do not affect Charter limitations on the growth of property taxes or water and sewer rates contained in Article III, Section 1, and Article DC, Section 20, of this Charter.
Enterprise funds (e.g, the Airport System) are all those largely self-sufficient activities not funded with property tax revenues. To maintain the self-sufficiency of the Water and Sewer System, the revenues of that System can only be used for the purposes of that System, and limited drainage purposes, as set forth in the existing debt covenants of that System. Those revenues cannot be used for any other purpose.
(b) For the purposes of calculating any revenue limitation in this Charter, amounts resulting from terminátion of or reduced participation in- a tax increment reinvestment zone shall be treated in the same manner as revenues from annexed areas in Article III, Section 1.
(c)City Council may prescribe methods for complying1 -with limits' on revenues in this Charter to account for changes in accounting standards or practices.
. Proposition H read as follows:
To pay for the public safety needs of an increased population, the City of Houston may collect revenues -of $90 million for police, fire and emergency medical services and related communications and dispatch costs, po long as the. Fiscal Year 2007 (Tax Year 2006) combined property tax rate is at or below the combined property tax rate in Fiscal Year 2006 (Tax Year 2005), notwithstanding any applicable revenue limitations in the Charter. Any amount collected under this authority must be spent on police, fire and emergency medical services and'-related communications and dispatch costs. This amount shall be added to any applicable revenue limitations in Fiscal Year 2007 (Tax Year 2006) and any base used to calculate revenue limitations in following budget years;
.. In their fifth issue, the City claims the City of Houston’s immunity is not waived for ultra vires claims against the Mayor. Because we understand appellees' pleadings as asserting a waiver of immunity for the City of Houston only in regards to their UDJA claims, it is unnecessary to address thiá 'issue.