[¶ 1] Thе Town of Long Island appeals from an order of the Superior Court (Cumberland County, Crowley, J.) denying in part its motion to dismiss an action brought by John S. Norton, Sr., seeking to quiet title and recover damages for an unconstitutional taking. Norton cross-appeals from that portion of the order granting in part the Town’s motion to dismiss. We dismiss the cross-appeals аnd do not reach the merits because the appeals are interlocutory and do not fall within any exceptions to the final judgment rule.
I. CASE HISTORY
[¶ 2] During the 1960s, John S. Norton, Sr., acquired frоm the United States a parcel of land on Long Island, along with adjacent submerged lands. Two streets, Island Avenue and Marginal Street, crossed Norton’s parcel. Believing that municipal authorities wrongly allowed people to park their cars along Island Avenue, Norton sought relief in Court.
[¶ 3] Norton first filed a complaint against the City of Portlаnd in May 1988 in the United States District Court for the District of Maine, invoking federal jurisdiction under 42 U.S.C. § 1983 and alleging that Portland had violated his constitutional rights by allowing people to park vehicles along Island Avenue. The court
(Carter, J.)
granted summary judgment in favor of the City of Portland on the basis that no constitutional violation could have occurred without Norton first seeking to settle state-based ownership issues.
Norton v. City of Portland,
No. 88-0147P, at 3 (D.Me. May 11, 1989) (unpublished decision). “In light of the decision that [Norton] cannot here prevail on his federal constitutional claim,” wrote the court, “a healthy sense of federal-state comity dictates that the resolution of those issues should be left to the state courts, which are better positioned to definitively adjudicate them.”
Id.
at 5 n. 2. The United States Court of Appeals for the First Circuit affirmed the decision.
Norton v. City of Portland,
[¶ 4] In August 1996, after Long Island seceded from Portland and became a separate town, Norton sued Long Island in the United States District Court.
Norton v. Town of Long Island,
No. 96-CV-250 (D.Me. Jan. 7, 1997) (unpublished decision). Because Norton’s complaint in this second federal suit was virtually identical to his complaint in the previous suit, the court
(Hornby, J.)
granted a summary judgment in favor of Long Island on grounds of res judicata. The United States Court of Appeals for the First Circuit affirmed the decision.
Norton v. Town of Long Island,
[¶ 5] On February 8, 2002, Norton filed a complaint against the Town in Superior Court seeking, in Count I, to quiet title to Island Avenue and Marginal Street; in Count II, to quiet title to submerged lands; and, in Count III, tо recover damages for the Town’s alleged unconstitutional takings of his property. On March 1, 2002, the
II. DISCUSSION
[¶ 6] A partial summary judgment does not qualify аs a final judgment because it does not dispose of all issues in controversy.
See Olson v. Albert,
[¶ 7] We have applied the judicial economy exception to review a narrow range of interlocutory appeals including, as is the case here, affirmative defenses. In
Lo-watchie
the appeal presented unique circumstances,
1
and we reached the appeal’s merits concluding that the res judicata doctrine barred the Deрartment’s second suit.
Id.
at 198, 200. Our opinion in
Lowatchie
does not, however, stand for the proposition that we entertain as a matter of course all interlocutory appeals from rulings concerning res judicata or other affirmative defenses.
See Porrazzo v. Karofsky,
[¶ 8] On the contrary, we will review such appeals оnly “in those situations in which the application of an affirmative defense is clear and an immediate review is necessary to promote judicial economy.”
Porrazzo,
[¶ 9] In the present case, although review of the merits might lead to a final disposition of the litigation, the applicability of res judicata is not clear and there are no unique circumstances that militate in favor of achieving judicial economy through interlocutory appellate review. As was true in Hart, this appeal presents complicated questions concerning res judi-cata’s applicability. We will have to consider, for example, whether Norton was compelled to bring forward his state theories in the federal action, whether the federal court could have decided to exercise it discretion in favor of аsserting supplemental jurisdiction, whether the federal court expressly reserved Norton’s right to maintain an action in state court, and whether Norton was unable to rely on his state theories in a single action because of some restriction on the federal court’s authority to entertain the multiple theories.
[¶ 10] In addition, unlike Lowat-chie, there are no unique сircumstances present that implicate substantial rights of the parties. “Judicial economy” is not a one-dimensional concept limited to the economy assоciated with abridging the trial process. We are also mindful of the potential for added expense and delay introduced by conducting appellate review bеfore the complete development of a dispute at the trial court level. When, as here, it has not been shown that a substantial right of a party will be affected absent immediate appellate review, we will not entertain an interlocutory appeal.
[¶ 11] We conclude that the judicial economy exceptiоn to the final judgment rule does not apply to this appeal because the application of res judicata is not clear, and there are no unique circumstances at this preliminary stage of the litigation that implicate substantial rights of the parties. We therefore do not reach the merits.
The entry is:
Appeal dismissed.
Notes
. In
Lowatchie,
the trial court dismissed with prejudice the Department of Human Services's paternity suit for want of prosecution, effectively adjudicating the merits of the claim.
