FISHER, Circuit Judge:

"We are called upon to consider, yet again, a takings challenge to mobile home rent control laws." Levald, Inc. v. City of Palm Desert, 998 F.2d 680, 683 (9th Cir. 1993). Carson Harbor Village, Ltd. ("Carson Harbor") is a large mobile home park located in the City of Carson ("City"). This case arises out of the City's handling of Carson Harbor's June 2000 and April 2001 applications for rent increases. In June 2000, Carson Harbor applied for monthly rent increases ranging from approximately $223 to $241 per mobile home space, but the City's Mobilehome Park Rental Review Board ("Board") approved an increase of only $14.29 per space. Thereafter, Carson Harbor sued in federal district court under 42 U.S.C. § 1983 claiming a violation of the Fifth Amendment's Takings Clause. The district court dismissed Carson Harbor's regulatory takings claims as unripe under Rule 12(b)(1) of the Federal Rules of Civil Procedure. Carson Harbor now appeals.

We agree that this regulatory takings claim is unripe. Carson Harbor has failed to avail itself of state procedures for seeking just compensation, as required by Williamson County Regional Planning Commission v. Hamilton Bank of Johnson City, 473 U.S. 172, 105 S.Ct. 3108, 87 L.Ed.2d 126 (1985), and has failed to show that these procedures are inadequate. Accordingly, we affirm the district court's dismissal of Carson Harbor's regulatory takings claim.

FACTUAL AND PROCEDURAL BACKGROUND

Carson Harbor is a 420 space, 70 acre mobile home park located in the City of Carson, California and accounts for approximately 17 percent of the City's mobile home rental housing. In 1979, the City enacted the Mobilehome Space Rent Control Ordinance ("Ordinance"), which places a ceiling on rent levels for mobile home spaces. See Carson Municipal Code ("CMC"), Art. IV, Ch. 7, §§ 4700 et seq. The purpose of the Ordinance was to prevent mobile home park owners from exploiting a perceived shortage in mobile home spaces by charging high rents. When the Ordinance was enacted, Carson Harbor was newly opened and was offering below-market rents in an effort to attract tenants. The Ordinance froze those below-market rents in place and required Carson Harbor to secure the Board's approval before instituting any rent increases.

The Ordinance does not provide for automatic rent increases for inflation or changed circumstances such as increased costs of operation or capital investments. Instead, a mobile home park owner seeking a rent adjustment above the ceiling must submit a rent increase application to the Board. CMC §§ 4703, 4704. The Board must then hold a public hearing, at which the mobile home park owner, affected residents and other interested persons may offer testimony. Id. § 4704(e)(f). After a hearing on a proposed rent increase, the Board "may approve the rent increase requested, approve a modified rent increase or deny the application pursuant to the standards established by subsection(g) of this Section." Id. § 4704(f)(3). Subsection (g) in turn provides that the Board "shall grant such rent increases as it determines to be fair, just and reasonable. A rent increase is fair, just and reasonable if it protects Homeowners from excessive rent increases and allows a fair return on investment to the Park Owner." Id. § 4704(g). The Board must consider 11 enumerated but nonexclusive factors when making its determination. Id. These include changes in the Consumer Price Index, capital improvements to mobile home spaces and changes in reasonable operating and maintenance expenses. Id.

This case arises out of the City's handling of Carson Harbor's June 2000 application for a rent increase. On June 28, 2000, Carson Harbor applied for monthly rent increases ranging from $222.65 to $240.73 for 407 of its 420 mobile home spaces. Carson Harbor claims that it sought the increases "so that the fair rate of return in 1999 would equal the fair rate of return at the inception of rent control in constant dollars." The Board held a hearing on the proposed increases on February 29, 2001, and subsequently approved a monthly rent increase of only $14.29 per space. Carson Harbor alleges that the Board "arbitrarily excluded hundreds of thousands of dollars in legitimately incurred operating expenses" in determining the size of the rent increase and that the Ordinance, "as applied, totally destroyed Plaintiff's reasonable investment-backed expectations."

On May 29, 2001, Carson Harbor filed a complaint in federal district court under 42 U.S.C. § 1983 alleging that the Board's partial denial of its June 2000 rent increase application constituted a regulatory taking of property in violation of the Fifth Amendment's Taking Clause, made applicable to the states through the Fourteenth Amendment. The defendants subsequently moved to dismiss Carson Harbor's regulatory takings claim for lack of subject matter jurisdiction under Rule 12(b)(1) of the Federal Rules of Civil Procedure. The district court granted the motion, holding that Carson Harbor's regulatory takings claim was unripe because Carson Harbor had failed to pursue state remedies for just compensation as required by Williamson.

STANDARD OF REVIEW

We review de novo a district court's dismissal of a complaint for lack of subject matter jurisdiction under Rule 12(b)(1). Nurse v. United States, 226 F.3d 996, 1000 (9th Cir. 2000). In reviewing the Rule 12(b)(1) dismissal, we must accept all factual allegations in the complaint as true. Id.

DISCUSSION

Under Williamson, an as-applied takings claim is ripe only if the plaintiff can establish that (1) "the government entity charged with implementing the regulations has reached a final decision regarding the application of the regulations to the property at issue," and (2) the claimant has sought "compensation through the procedures the State has provided for doing so." 473 U.S. at 186, 194, 105 S.Ct. 3108; see also Suitum v. Tahoe Reg'l Planning Agency, 520 U.S. 725, 733-34, 117 S.Ct. 1659, 137 L.Ed.2d 980 (1997). The first ripeness requirement embodies "the important principle that a landowner may not establish a taking before a land-use authority has the opportunity, using its own reasonable procedures, to decide and explain the reach of a challenged regulation." Palazzolo v. Rhode Island, 533 U.S. 606, 620, 121 S.Ct. 2448, 150 L.Ed.2d 592 (2001). As a general rule, until the landowner has "followed reasonable and necessary steps to allow regulatory agencies to exercise their full discretion in considering [whether to grant the landowner's request], including the opportunity to grant any variances or waivers allowed by law[,] . . . the extent of the restriction on property is not known and a regulatory taking has not yet been established." Id. at 620-21, 121 S.Ct. 2448. "The second [ripeness requirement] stems from the Fifth Amendment's proviso that only takings without `just compensation' infringe that Amendment; `if a State provides an adequate procedure for seeking just compensation, the property owner cannot claim a violation of the Just Compensation Clause until it has used the procedure and been denied just compensation.'" Suitum, 520 U.S. at 734, 117 S.Ct. 1659 (quoting Williamson, 473 U.S. at 195, 105 S.Ct. 3108).

We think it beyond question — and the City does not dispute — that Carson Harbor's regulatory takings claim satisfies the first (finality) prong of the Williamson ripeness test. Carson Harbor made a meaningful application for a variance from the rent control law by submitting an application for a rent increase in June 2000, which the Board partially granted and partially denied on February 28, 2001. See Carson Harbor Village Ltd. v. City of Carson, 37 F.3d 468, 475(9th Cir. 1994) (holding than an earlier regulatory takings claim satisfied the first prong of Williamson because Carson Harbor had applied for a rent increase, which was partially granted and partially denied), overruled in part on other grounds by WMX Techs. v. Miller, 104 F.3d 1133, 1136 (9th Cir. 1997) (en banc); see also Kawaoka v. City of Arroyo Grande, 17 F.3d 1227, 1232 (9th Cir. 1994).

The disputed question on appeal is whether Carson Harbor has satisfied the second (exhaustion) prong of Williamson. Carson Harbor admits that it has failed to seek state remedies for the alleged taking, but argues that it is not required to do so because those remedies are inadequate. Williamson itself held that a plaintiff may be excused from exhausting state remedies if the plaintiff demonstrates that the remedies are "unavailable or inadequate." 473 U.S. at 197, 105 S.Ct. 3108; see also Wash. Legal Found. v. Legal Found. of Wash., 271 F.3d 835, 851 (9th Cir. 2001) (en banc), aff'd by Brown v. Legal Found. of Wash., 538 U.S. 216, 123 S.Ct. 1406, 155 L.Ed.2d 376 (2003). "A landowner who seeks to sue in federal court before seeking compensation from the state `bears the burden of establishing that state remedies are inadequate.'" Del Monte Dunes at Monterey, Ltd. v. City of Monterey, 920 F.2d 1496, 1506-07 (9th Cir. 1990) (quoting Austin v. City County of Honolulu, 840 F.2d 678, 680 (9th Cir. 1988)). "A landowner fails to discharge this burden by showing that state procedures are untested or uncertain." Id. at 1507; see also Bateson v. Geisse, 857 F.2d 1300, 1306 (9th Cir. 1988); Austin, 840 F.2d at 681.

The question, then, is whether Carson Harbor has shown that California's procedures for seeking just compensation are inadequate. Until the California Supreme Court decided Kavanau v. Santa Monica Rent Control Board, 16 Cal.4th 761, 66 Cal.Rptr.2d 672, 941 P.2d 851 (1997), the state procedure for obtaining just compensation for a takings claim was to bring an inverse condemnation action in state court. If that had remained the procedure when the taking allegedly occurred in this case, there would be no question that California's compensation remedies were adequate and that Carson Harbor's takings claim would be unripe. We have "expressly held that, post 1987, California's inverse condemnation procedures are adequate to address a regulatory takings claim." San Remo Hotel v. City County of San Francisco, 145 F.3d 1095, 1102 (9th Cir. 1998) (citing Christensen v. Yolo County Bd. of Supervisors, 995 F.2d 161, 164 (9th Cir. 1993); Schnuck v. City of Santa Monica, 935 F.2d 171, 174 (9th Cir. 1991)).

Kavanau and, subsequently, Galland v. City of Clovis, 24 Cal.4th 1003, 103 Cal. Rptr.2d 711, 16 P.3d 130 (2001), however, have modified California's procedure for seeking just compensation in a takings case. In Kavanau, the court held that "a landlord may not obtain inverse condemnation damages against a government agency for temporarily imposing rent ceilings . . . so as long as the landlord was able to obtain an adequate adjustment of prospective rents that would compensate for past losses." Galland, 103 Cal.Rptr.2d 711, 16 P.3d at 143 (interpreting Kavanau); see Kavanau, 66 Cal.Rptr.2d 672, 941 P.2d at 854 ("[W]e conclude Kavanau is not entitled to maintain an inverse condemnation action, because he may obtain a full and adequate remedy for any interim loss flowing from the due process violation through an adjustment of future rents under the rent regulation process."). Before an owner of rental property can bring a state inverse condemnation proceeding against a rental review board, the owner must first challenge the board's actions by applying for a writ of administrative mandate in state court. See Galland, 103 Cal.Rptr.2d 711, 16 P.3d at 143. Once the writ has been granted, the property owner must then seek an adjustment of future rents from the rental review board. Such an adjustment is also referred to as a " Kavanau adjustment." See id. at 145.

In Galland, the court considered the further question whether a property owner could seek section 1983 damages in state court for a violation of substantive due process before seeking a writ of mandate and a Kavanau adjustment. The court answered this question in the negative: "[W]hen landlords seek section 1983 damages from allegedly confiscatory rent regulation, we hold that they must show (1) that a confiscatory rent ceiling or other rent regulation was imposed and (2) that relief via a writ of mandate and a Kavanau adjustment is inadequate." Id. at 145. Under Kavanau and Galland, then, it appears that a landowner must seek a writ of mandate and Kavanau adjustment before bringing an inverse condemnation or section 1983 action in state court. Kavanau and Galland thus mark a significant change in California's state law remedies for excessive rent control.

Carson Harbor argues that Kavanau and Galland have rendered California's compensation scheme inadequate. In Hacienda Valley Mobile Estates v. City of Morgan Hill, 353 F.3d 651, No. 02-15986, 2003 WL 22961340 (9th Cir. Dec.17, 2003), we recently concluded that the mobile home park owner failed to show that California's state remedies are inadequate. Id. at 659, 2003 WL 22961340 at *6. Carson Harbor contends, however, that Kavanau and Galland have effectively deprived rent-controlled property owners of the ability to bring inverse condemnation or section 1983 damages actions, which places them in the very position the Supreme Court declared unconstitutional in First English Evangelical Lutheran Church of Glendale v. County of Los Angeles, 482 U.S. 304, 107 S.Ct. 2378, 96 L.Ed.2d 250 (1987). Before First English was decided, a landowner could not maintain an inverse condemnation proceeding in California state court based on a regulatory taking. See Agins v. City of Tiburon, 24 Cal.3d 266, 157 Cal.Rptr. 372, 598 P.2d 25, 29-31 (1979), aff'd on other grounds, 447 U.S. 255, 100 S.Ct. 2138, 65 L.Ed.2d 106 (1980). Under Agins, the landowner's sole remedy was to bring an action for a writ of mandate. Even if the writ were granted, the landowner could not receive compensation for damages incurred before issuance of the writ; rather, the landowner could only receive compensation for damages incurred after the writ was issued, if the government persisted in enforcing the invalidated regulation. In First English, the United States Supreme Court abrogated the Agins rule, holding that California's writ of mandate was an inadequate remedy for a regulatory taking of property. 482 U.S. at 321, 107 S.Ct. 2378. Carson Harbor argues that Kavanau and Galland have in effect restored the Agins rule, and that First English therefore requires us to declare California's compensation scheme inadequate.

We do not read Kavanau and Galland as reinstating the Agins rule. First, the mandamus/ Kavanau adjustment remedy does — at least in principle — allow a landowner to recover for damages incurred prior to issuance of the writ of mandate: the Kavanau adjustment is supposed to compensate for past losses. Second, inverse condemnation and section 1983 damages remedies appear to remain available if the mandamus/ Kavanau adjustment remedy proves inadequate. In Kavanau, the court stated that it did not need to:

decide what alternative remedy might be appropriate if a landlord can establish that the remedy of future rent adjustments is for some reason unavailable. But before Kavanau can allege the unavailability of future rent adjustments, he must petition for those adjustments, the Rent Board must determine, subject to judicial review, their appropriate amount, and he must attempt to impose them.

66 Cal.Rptr.2d 672, 941 P.2d at 867. In Galland, the court went further and held that a landlord can seek section 1983 damages if he can "show (1) that a confiscatory rent ceiling or other rent regulation was imposed and (2) that relief via a writ of mandate and a Kavanau adjustment is inadequate." 103 Cal.Rptr.2d 711, 16 P.3d at 145.

Carson Harbor further contends that a writ of mandate and Kavanau adjustment will not provide adequate compensation because the superior court issuing the writ must remand the case to the municipal rental review board to determine the increase in future rents necessary to compensate the plaintiff for past losses. See Kavanau, 66 Cal.Rptr.2d 672, 941 P.2d at 866. According to Carson Harbor, the rental review board is unlikely to grant an adequate rent increase because it was unwilling to grant an adequate rent increase in the first place, and consequently California's new compensation scheme will "result in a string of writ of mandate challenges, and a string of remand hearings, the costs of litigation ever increasing, until one party or another, the city or the park owner, gives up in exhaustion."

We acknowledge that Carson Harbor raises serious concerns about the adequacy of the new compensation procedures established in Kavanau and Galland. Nevertheless, the alleged inadequacy of the procedures remains highly speculative. Carson Harbor has not sought a writ of mandate and Kavanau adjustment, nor has Carson Harbor identified any landowner who has sought and failed to receive adequate compensation through these procedures. At best, Carson Harbor has merely alleged that the new compensation procedures are "untested or uncertain." Del Monte Dunes, 920 F.2d at 1507. Under our precedents, that is not enough to qualify for an exemption from Williamson's second ripeness requirement. Id. It may turn out that the mandamus/ Kavanau process proves to be futile. We will not, however, assume the accuracy of this prediction. See Hacienda Valley, 353 F.3d at 659, 2003 WL 22961340, at *6. Accordingly, we affirm the dismissal of Carson Harbor's regulatory takings claim as unripe. AFFIRMED.