Opinion for the Court filed by Circuit Judge BORK.
Robert Silverman, Howard Pollinger, and WAVN, Inc. appeal the district court’s dis *1122 missal of their complaint for want of jurisdiction. We reverse, finding jurisdiction proper under 28 U.S.C. §§ 1331 and 1343 (1976), and remand to the district court for proceedings not inconsistent with this opinion.
I.
Appellants are the sole general partners in Van Ness Properties III, a limited partnership holding title to a residential apartment complex (“Van Ness”) in the District of Columbia. On April 26, 1979, the partnership submitted applications to convert Van Ness to a condominium and a cooperative pursuant to the Condominium Act of 1976. D.C.Code Ann. § 45-1801 et seq. (1981). That statute permitted conversion of apartments which satisfied specific statutory criteria. The local agency responsible for processing such applications, the Department of Housing and Community Development, has never acted on them.
Thirty-three days after appellants filed the conversion applications, the District Council enacted the first in a series of “emergency” measures prohibiting conversion of Van Ness and other rental property. Each emergency act — promulgated, according to the appellees, under authority of the District’s Home Rule Act — prevented condominium conversion for ninety days. 1 These successive measures effected, with narrowly defined exceptions, a ban on conversion extending at least nine months.
The Washington Home Ownership Council, Inc. (“WHOC”), a nonprofit organization composed primarily of real estate brokers and developers, challenged the legality of enacting successive “emergency” legislation in the District of Columbia superior court. The challenge was sustained, that court ruling that the District Council had abused its authority under the Home Rule Act by adopting successive and identical emergency bills. Washington Home Ownership Council, Inc. v. District of Columbia, C.A. No. 10624-79 (D.C.Super.Ct. Oct. 19, 1979). The District, however, obtained a stay of this order pending appeal and refused to process appellants’ conversion applications.
The trial court’s ruling was affirmed by the District of Columbia Court of Appeals in May of 1980.
District of Columbia v. Washington Home Ownership Council, Inc.,
*1123 Appellants then sued the District government in the federal court. The complaint alleged violations of appellants’ due process and equal protection rights claiming that the District Council’s actions, and the inaction of the Department of Housing and Community Development, resulted in a taking of appellants’ property without just compensation and constituted an unlawful exercise of police power; the current condominium law is alleged to constitute an impermissible delegation of legislative authority to the tenants. Appellants sought in-junctive and declaratory relief to prevent the District from further interference with their property rights and to have the District’s past actions declared illegal. The complaint also sought monetary damages and a writ of mandamus compelling the District government to take those steps necessary to restore appellants’ rights as they existed when the original conversion applications were filed.
The District moved to dismiss the complaint for lack of subject matter jurisdiction and for failure to state a claim upon which relief could be granted. The District also argued that the local courts had exclusive jurisdiction over the dispute under the District of Columbia Administrative Procedure Act. Moreover, the District asserted that appellants had invoked federal jurisdiction “solely ... to circumvent an adverse ruling by the District of Columbia courts,” Brief for Appellees at 14, and that the WHOC litigation in the local courts operated as a res judicata bar to appellants’ claims.
Following oral argument, the lower court dismissed the complaint for want of jurisdiction — the failure to present a substantial constitutional question — under 28 U.S.C. §§ 1331 and 1343. The lower court went on to find that even had appellants’ allegations presented a substantial claim for relief, exclusive jurisdiction would lie in the District of Columbia court system under the local Administrative Procedure Act and the District of Columbia Court Reform and Criminal Procedure Act of 1970. 3 Finally, the court added, abstention was warranted under the facts of the case although it did not articulate any fact, policy or local law question upon which an abstention order might be based. 4
This appeal followed.
*1124 II.
The district court ruled that appellants failed to establish jurisdiction under 28 U.S.C. §§ 1331 or 1343. While the jurisdictional threshold under each section is distinct, the difference seems more stylistic than substantive.
Harper v. McDonald,
The appellants alleged in their complaint that the District of Columbia violated their rights under the due process clause and the equal protection clause by refusing to permit the conversion of appellants’ building through administrative delay on their applications, by enacting successive and illegal emergency measures which prohibited conversion, and by impermissibly delegating to the tenants of the building the power to prohibit conversion under the current legislative scheme. The complaint also alleges that the District, through the totality of its actions and inactions, has unlawfully taken the owners’ property without just compensation.
In
Logan v. Zimmerman Brush Co.,
The District relies on this latter principle and argues that appellants’ claims lack merit because the government is free to modify or eliminate statutory entitlements.
See, e.g., United States Railroad Retirement Board v. Fritz,
Appellants have also challenged the sequence of legislative enactments by the District Council prohibiting conversion as exceeding the police power granted to the District by Congress. Ordinarily, a properly enacted land use regulation would not exceed the District’s police power. The Supreme Court has not struck down a zoning
*1126
ordinance on police power grounds since 1928.
See Nectow
v.
City of Cambridge,
The complaint also alleges that the current regulatory scheme impermissibly delegates to private citizens the legislative power granted to the District Council. The Supreme Court has held this sort of delegation unconstitutional.
Washington ex rel. Seattle Title Trust Co. v. Roberge,
Appellants’ final constitutional claim alleges that the District, through the totality of events, has taken their property without due process. On the merits, this analysis calls for an “essentially ad hoc, factual inquir[y].”
Loretto v. Teleprompter Manhattan CATV Corp.,
We recognize that takings clause challenges in this context have not fared well. See generally Note, supra, 78 Mich.L.Rev. at 132-35. Nonetheless, in the absence of a dispositive decision by the Supreme Court, and in light of that Court’s emphasis upon an individualized inquiry in takings clause cases, this claim should not be dismissed on jurisdictional grounds.
The district court’s order is
Reversed.
Notes
. Ordinarily, the District of Columbia’s Home Rule Act permits the Council to pass legislation which becomes effective only after a 30-day layover in Congress, during which time Congress may disapprove of such enactment by concurrent resolution. D.C.Code Ann. §§ 1-227(a) to 1-233(c)(1) (1981).
See also District of Columbia v. Washington Home Ownership Council, Inc.,
We make no decision today regarding the effect of
Immigration and Naturalization Service v.
Chadha, -- U.S. --,
. Despite holding that the District Council had “no authority to pass [successive] substantially identical emergency act[s] in response to the same emergency,” the Court of Appeals noted that the specific emergency measure it held illegal had been superseded by permanent legis
*1123
lation.
. Though the district court gave no reason for this ruling, it may have thought appellants’ claim essentially one for administrative relief and hence arguably cognizable only in the District court system. Under
Patsy v. Board of Regents,
We also note that while the trial court did not rule on the res judicata and collateral estoppel arguments, the District’s position does not appear frivolous. See Memorandum in Support of Defendants’ Motion to Dismiss at 20-23; Brief for Appellee at 30 n. 23. On remand, therefore, the district court should initially consider this claim before proceeding to trial on the merits.
. The abstention doctrines represent one type of prudential limitation restricting an Article III court’s general obligation to hear federal constitutional claims.
See generally
17 C. Wright, A. Miller & E. Cooper,
Federal Practice and Procedure
§ 4241
et seq.
(1978). Abstention from federal jurisdiction is the exception, however, and not the rule.
Colorado River Water Conservation District v. United States,
The trial court did
not
specify which abstention rule it thought appropriate in this case. Nor did it address the threshold question of whether the abstention rules, doctrinally based on concerns of federalism and comity, apply at all in the District of Columbia, a creature of Congress. However, because we are of the view that abstention was not warranted here as described briefly below, we proceed as this court has on other occasions and assume, for discussion purposes only, that the abstention rules apply in the District with the same force as they do where a state sovereign is involved. See,
e.g., Kaplan v. Hess,
Of the three abstention rules recognized by the Supreme Court,
Younger
abstention — appropriate where federal jurisdiction has been invoked to restrain then pending state criminal proceedings — is clearly not indicated here.
See generally Younger v. Harris,
The Supreme Court has also identified, as the third branch of the doctrine,
Burford
abstention — appropriate where there have been presented “difficult questions of state law bearing on policy problems of substantial public import whose importance transcends the result in the case then at bar.”
Colorado River Water Conservation District v. United States,
. We also note that while a party’s claim may prove lacking when considered on the merits, that claim is not necessarily insubstantial for purposes of jurisdiction. In Bell v. Hood, the Supreme Court clearly stated that:
Jurisdiction ... is not defeated as respondents seem to contend, by the possibility that the averments might fail to state a cause of action on which petitioners could actually recover. For it is well settled that the failure to state a proper cause of action calls for a judgment on the merits and not for a dismissal for want of jurisdiction. Whether the complaint states a cause of action on which relief could be granted is a question of law and just as issues of fact it must be decided after and not before the court has assumed jurisdiction over the controversy. If the court does later exercise its jurisdiction to determine that the allegations in the complaint do not state a ground for relief, then dismissal of the case would be on the merits, not for want of jurisdiction.
. While the majority opinion did not address the appellant’s equal protection claim, it appears that a majority of the Court concluded, in separate opinions, that the termination of appellant’s claim by the state was also in contravention of the equal protection clause.
Logan v. Zimmerman Brush Co.,
