In Diamond v. Bland II (1974) 11 Cal.3d 331, which was an outgrowth of an exclusion from a regional shopping center of solicitors of signatures for an antipollution initiative, the court finally held, because the plaintiffs had effective, alternative channels of communication with the public, and because the solicitation activities bore no relationship to the shopping center activities, that it was permissible to exclude the plaintiffs. The court said, "under these circumstances, we must conclude that defendants' private property interests outweigh plaintiffs' own interests in exercising First Amendment rights in the manner sought herein." ( Diamond v. Bland II, supra , 11 Cal.3d 331, 335.)