Whether the court could consider the federal antitrust challenge, although it was raised late in the appeal and initially by amici.
Holding
Yes. The court could address the issue because Boulder introduced an important new legal question concerning antitrust scrutiny of municipal regulation, and the facial challenge presented a legal question of substantial public importance.
Reasoning
A reviewing court ordinarily applies the law in force when it decides an appeal from a judgment granting or denying injunctive relief. Boulder, decided while this litigation was pending, made municipal regulatory activity potentially subject to Sherman Act scrutiny in a way not previously clear.
The landlords sought invalidation of a municipal ordinance under the federal supremacy clause, rather than private antitrust damages. State courts have authority to decide whether a local enactment is facially preempted by federal antitrust law.
The issue was legal, rested on undisputed facts, was fully briefed after the court permitted supplemental submissions, and implicated an important question of public policy: the extent to which federal antitrust law constrains local economic regulation.