Fornatora , 557 F.3d at 1299; see id. at 1304 (“The evidence instead shows that the purpose and intent of the regulations was for the ecological reasons set out in the Ordinance . . . . Additionally, . . . there is clearly insufficient evidence to show that the United States acted in concert or agreement to depress the property values. All the evidence . . . shows is that the federal government shared the concerns expressed by the state and local governments in ensuring the continued vitality of the natural resources of South Florida.” (quoting magistrate judge’s findings adopted by district court)).