Opinion for the Court filed by Circuit Judge RANDOLPH.

This petition for judicial review of an order of the National Labor Relations Board, and the Board’s cross-petition for enforcement, turn on whether California law gives labor organizers a right to hand out leaflets in the privately-owned parking lot of a stand-alone grocery store. Because it was not clear where the Supreme Court of California stood on the subject, we certified two questions to it.1 The California court refused to decide the questions. It has therefore fallen upon this court to determine the meaning of California law, in light of the First Amendment to the Constitution. We hold that under California law, union organizers have no right to distribute literature on a stand-alone grocery store’s private property.

I.

The facts are these. WinCo owns and operates a retail supermarket in Chico, California. Waremart Foods, 337 N.L.R.B. No. 41, 2001 WL 1699624, at *3 (Dec. 20, 2001). The store stands alone adjacent to its parking lot on a parcel of about 10 acres. Id. Customers can enter the store only from the parking lot. Id. Apart from allowing the Girl Scouts to sell cookies outside the store entrance shortly after it opened, WinCo has prohibited solicitors from operating on store premises and the Superior Court has twice issued injunctions to halt such activity. See id. at *4, *10; Waremart, Inc. v. Progressive Campaigns, Inc., 102 Cal.Rptr.2d 392, 393 (Cal.Ct.App. 2000), review granted, 105 Cal.Rptr.2d 386, 19 P.3d 1128 (Cal. 2001), review dismissed and cause remanded, 119 Cal.Rptr.2d 697, 45 P.3d 1161 (Cal. 2002).

In April 1999, union organizers entered the Chico store’s parking lot and began distributing handbills to WinCo customers. 337 N.L.R.B. No. 41, 2001 WL 1699624, at *4. The handbills, which purported to come from an organization entitled “Mothers Against WinCo,” urged shoppers not to patronize WinCo stores. Id. at *4-*5. The store manager spoke with one of the organizers, returned to the store and called the police. Id. at *5-*6. By the time the police arrived the handbilling was over for the day and the union organizers left. Id. at *6.

The Board ruled that WinCo violated § 8(a)(1) of the National Labor Relations Act, 29 U.S.C. § 158(a)(1), when it prohibited nonemployee union representatives from engaging in customer handbilling. 337 N.L.R.B. No. 41, 2001 WL 1699624, at *1, *11. In the Board’s view, Lechmere, Inc. v. NLRB, 502 U.S. 527, 112 S.Ct. 841, *872117 L.Ed.2d 79 (1992), was inapposite because “under California property law, [WinCo] did not have a right to exclude union representatives from its property. Sears, Roebuck & Co. v. San Diego District Council of Carpenters, 25 Cal.3d 317, 158 Cal.Rptr. 370, 599 P.2d 676 (1979) [Sears II].” 337 N.L.R.B. No. 41, 2001 WL 1699624, at *1.

II.

Unless California law is what the Board says it is, this case is indistinguishable from Lechmere and the Board’s decision is in error. See ITT Industries, Inc. v. NLRB, 251 F.3d 995, 1000-03 (D.C.Cir. 2001). Lechmere maintained a nosolieitation policy at its store in the Lechmere Shopping Plaza in Connecticut. After union organizers began handing out leaflets in the shopping center’s parking lot, which Lechmere jointly owned, the company’s manager barred them from the property. In Connecticut, as elsewhere, a “conditional or restricted consent to enter land creates a privilege to do so only in so far as the condition or restriction is complied with.” Restatement (Seoond) of ToRts § 168 (1965). See New York New York, LLC v. NLRB, 313 F.3d 585, 589 (D.C.Cir. 2002). The organizers in Lechmere were therefore trespassers. The Supreme Court described them as such and held that Lechmere had not violated the National Labor Relations Act in excluding them from its property. 502 U.S. at 540, 112 S.Ct. 841; see Thunder Basin Coal Co. v. Reich, 510 U.S. 200, 217 n. 21, 114 S.Ct. 771, 127 L.Ed.2d 29 (1994).

In this case, the Board ascertained California law from the 1979 decision in Sears II, a case on remand from the Supreme Court. See Sears, Roebuck & Co. v. San Diego Dist. Council of Carpenters, 436 U.S. 180, 98 S.Ct. 1745, 56 L.Ed.2d 209 (1978). Union organizers picketed a Sears retail store in Chula Vista, California. The picketing occurred on Sears’ property - on walkways leading to the store or in the store parking lot. Sears brought a trespass action against the union and the trial court granted a preliminary injunction. On appeal, the California court held that the National Labor Relations Act preempted state trespass law. Sears, Roebuck & Co. v. San Diego Dist. Council of Carpenters, 17 Cal.3d 893, 132 Cal.Rptr. 443, 553 P.2d 603 (1976). The Supreme Court reversed, holding that the labor preemption doctrine did not apply to the tres-passory aspects of union picketing. 436 U.S. at 198-207, 98 S.Ct. 1745. Although it referred throughout its opinion to the union organizers as trespassers, the Court dropped a footnote stating that it did not mean to foreclose the California court from considering, on remand, whether the organizers had committed a trespass under state law. Id. at 185 n. 8, 98 S.Ct. 1745.

In the meantime the California Supreme Court, in Robins v. Pruneyard Shopping Ctr., 23 Cal.3d 899, 153 Cal.Rptr. 854, 592 P.2d 341 (1979), held that the California Constitution protected “speech and petitioning, reasonably exercised, in shopping centers even when the centers are privately owned.” Id. at 347. The court reasoned that shopping centers had become the functional equivalents of “miniature downtowns” and should be treated as public forums, from which expressive activity cannot be entirely excluded, although it may be regulated by reasonable time, place and manner restrictions. Id. at 345-48. (The Supreme Court so understood the decision and affirmed. PruneYard Shopping Ctr. v. Robins, 447 U.S. 74, 83-84, 100 S.Ct. 2035, 64 L.Ed.2d 741 (1980).)

When the Sears case returned on remand, the California court for the first time focused on the “Moscone Act,” Cal. Civ.PROC.Code § 527.3, a statute passed in 1975. The Act deprived state courts of jurisdiction to issue injunctions against persons distributing information about a *873labor dispute “in any place any person or persons may lawfully be” (§ 527.3(b)(1)) and against “[pjeaceful picketing or patrolling involving any labor dispute” (§ 527.3(b)(2)). Whether subsection (b)(2) meant that picketing as well as information distribution had to occur in a place where the person “may lawfully be” was unnecessary to decide, according to a three-Justice plurality. 158 Cal.Rptr. 370, 599 P.2d at 681-82. Subsection (a) stated that the Act should be construed in accordance with “existing law.” Existing California law, as the plurality saw it in 1979, “establishes that peaceful picketing on privately owned walks outside the employer’s store is not subject to injunction.” Id. at 682. The court then cited and discussed two of its decisions: In re Lane, 71 Cal.2d 872, 79 Cal.Rptr. 729, 457 P.2d 561 (1969); and Schwartz-Torrance Inv. Corp. v. Bakery & Confectionery Workers’ Union, 61 Cal.2d 766, 40 Cal.Rptr. 233, 394 P.2d 921 (1964). The concurring opinion of one Justice, needed to make a majority, agreed that the injunction should be vacated, but disagreed that the state legislature “ ‘intended the courts to continue to follow (all) principles of California labor law extant at the time of the enactment of section 527.3.’ ” 158 Cal.Rptr. 370, 599 P.2d at 687 (Newman, J.) (quoting the plurality opinion at id. 685, but adding the “all”). No explanation followed.

Lane held that handbilling by a union representative on the private sidewalk of a stand-alone grocery store was protected by a now-discredited interpretation of the First Amendment to the Constitution.2 Lane stated its holding exclusively in those terms: “the fact of private ownership of the sidewalk does not operate to strip the members of the public of their rights to exercise First Amendment privileges on the sidewalk at or near the place of entry to the establishment.” 457 P.2d at 565. Schwartz-Torrance is not as clear: the court not only relied on the First Amendment but also suggested that a private shopping center might be treated as if it were a publicly-owned facility, apparently under state law. See 40 Cal.Rptr. 233, 394 P.2d at 923-25.

A later plurality opinion of the California Supreme Court read both Lane and Schwartz-Torrance as resting on the interpretation of the First Amendment to the Constitution overruled in Hudgens, see supra note 2, rather than on California law. See Golden Gateway Ctr. v. Golden Gateway Tenants Ass’n, 26 Cal.4th 1013, 111 Cal.Rptr.2d 336, 29 P.3d 797, 809 & n. 11 (2001). Like Sears II, Golden Gateway *874did not produce a majority opinion. In the residential portion of a retail-apartment complex a tenants’ association had been distributing a newsletter door to door. The owner sought to stop the distribution. When the tenants’ association refused, claiming that the owner’s action violated its right under state law to engage in free speech, the owner obtained a preliminary injunction. On appeal, a three-Justice plurality held that under the California Constitution, the association’s free speech rights depended on the existence of state action and here there was none. 111 Cal.Rptr.2d 336, 29 P.3d at 810. The court distinguished Robins on the ground that the shopping center there was the “functional equivalence ... [of] a traditional public forum” and extended an “open and unrestricted invitation to the public to congregate freely.” Id. at 809. The apartment complex, in contrast, is not open to the public; access is restricted to “residential tenants and their invitees.” Id. at 810. Therefore the complex, “unlike the shopping center in Robins, is not the functional equivalent of a traditional public forum.” Id.

Four opinions of intermediate appellate courts in California, three rendered before Golden Gateway and one after, have held that state law does not provide a free speech right to those seeking to engage in expressive activities on the private sidewalks or in the private parking lots of stand-alone supermarkets. See Albertson’s, Inc. v. Young, 107 Cal.App.4th 106, 131 Cal.Rptr.2d 721, 731-34 (2003); Young v. Raley’s, Inc., 107 Cal.Rptr.2d 172, 179-82 (Cal.Ct.App. 2001), review granted, 111 Cal.Rptr.2d 335, 29 P.3d 795 (Cal. 2001), review dismissed and cause remanded, 119 Cal.Rptr.2d 698, 45 P.3d 1162 (Cal. 2002); Waremart, Inc., 102 Cal.Rptr.2d 392 (2000), review granted, 105 Cal.Rptr.2d 386, 19 P.3d 1128 (Cal. 2001), review dismissed and cause remanded, 119 Cal.Rptr.2d 697, 45 P.3d 1161 (2002); Trader Joe’s Co. v. Progressive Campaigns, Inc., 73 Cal.App.4th 425, 86 Cal.Rptr.2d 442, 448-49 (1999).3 The court of appeals in Albertson’s, the ease decided after Golden Gateway, reasoned that a supermarket and its private surroundings could not be equated with a public forum under Robins because there were “no enclosed walkways, plazas, courtyards, picnic areas, gardens, or other areas that might invite the public to congregate” there. 131 Cal.Rptr.2d at 733.

III.

In light of these developments, we expressed uncertainty in our earlier opinion, Waremart Foods, 333 F.3d at 227, about whether Sears II represented current California law. ' We now hold that it does not and that the National Labor Relations Board erred in relying on that decision.

Sears II recognized a right to engage in labor picketing in a private parking lot and on private sidewalks outside a stand-alone store. The plurality opinion said its decision rested on the Moscone Act’s special protection for labor activity, not on the State Constitution.4 158 Cal.*875Rptr. 370, 599 P.2d at 683 n. 5. It was therefore irrelevant to the plurality where the store was located or whether it fit within the rationale of Robins. Id. at 687. As WinCo argued before us and before the Board, the Sears II plurality opinion cannot reflect current California law because the rule it embraces violates the First Amendment to the Constitution. In Police Dep’t of City of Chicago v. Mosley, 408 U.S. 92, 92 S.Ct. 2286, 33 L.Ed.2d 212 (1972), a local ordinance prohibited picketing in the vicinity of schools during school hours; in Carey v. Brown, 447 U.S. 455, 100 S.Ct. 2286, 65 L.Ed.2d 263 (1980), a state law prohibited picketing of residences. Both the ordinance and the state law contained an exemption for labor picketing. In both cases the Supreme Court held that the exemption constituted content discrimination in violation of the First Amendment. See Mosley, 408 U.S. at 95, 92 S.Ct. 2286 (“The central problem with Chicago’s ordinance is that it describes permissible picketing in terms of its subject matter.”); Carey, 447 U.S. at 466, 100 S.Ct. 2286 (rejecting the idea that “labor picketing is more deserving of First Amendment protection than are public protests over other issues”). Mosley and Carey thus render unconstitutional the principle on which the Sears II plurality based its decision. We believe that if the meaning of the Moscone Act came before the California Supreme Court again, it would either hold the statute unconstitutional or construe it to avoid unconstitutionality. See, e.g., Harrott v. County of Kings, 25 Cal.4th 1138, 108 Cal.Rptr.2d 445, 25 P.3d 649, 657 (2001) (“[A] statute must be interpreted in a manner, consistent with the statute’s language and purpose, that eliminates doubts as to the statute’s constitutionality.”). Thus, under California law labor organizing activities may be conducted on private property only to the extent that California permits other expressive activity to be conducted on private property.

The supplemental briefs of the interve-nor union and the Board no longer defend the Board’s reliance on Sears II. (The union does not even cite Sears II.) Board counsel now asks us to uphold the Board on the basis of the California Supreme Court’s 1969 decision in In re Lane, 71 Cal.2d 872, 79 Cal.Rptr. 729, 457 P.2d 561. The facts of Lane are comparable to those presented here, but as we have discussed, swpra p. 871, the decision did not rest on California law. It rested instead on an interpretation of the First Amendment, an interpretation the Supreme Court later overruled in Hudgens v. NLRB, 424 U.S. at 518-21, 96 S.Ct. 1029. See supra note 2. Two intermediate California appellate courts have recognized, in alternative holdings, that Lane rested on federal law, since discredited. See Albertson’s, 131 Cal.Rptr.2d at 735 (Lane “based on federal Constitution and federal precedent,” not State Constitution); Trader Joe’s, 86 Cal.Rptr.2d at 450 (“[T]he Lane court based its holding on federal Supreme Court precedent which was subsequently overruled.”); see also Golden Gateway, 111 Cal.Rptr.2d 336, 29 P.3d at 809 n. 11 (describing Lane as relying on First Amendment and Logan Valley) (plurality opinion); but see Costco Cos., Inc. v. Gallant, 96 Cal.App.4th 740, 117 Cal.Rptr.2d 344, 355 n. 1 (2002) (dictum).

The Ninth Circuit, in NLRB v. Calkins, 187 F.3d 1080 (9th Cir. 1999), held that an employer committed an unfair labor practice when it interfered with union organizers picketing and handbilling on the privately owned walkway and parking lot outside its grocery store. The court of appeals believed that in light of Sears II and Lane, the union organizers had a right under California law to engage in those activities on the store’s property. *876Id. at 1090-91. For the reasons just mentioned, we think neither case reflects current California law.

Nor do we believe that Robins v. Pruneyard Shopping Ctr., 23 Cal.3d 899, 153 Cal.Rptr. 854, 592 P.2d 341 (1979), gave the union organizers a right to conduct activities on WinCo’s private property. The case dealt with expressive activity in a privately-owned shopping center. The California Supreme Court’s rationale - that the shopping center should be treated as a traditional public forum because it had become the functional equivalent of a town center, id. at 345-48 - cannot be applied to WinCo’s grocery store. As Albertson’s and Trader Joe’s hold, free-standing grocery stores are not miniature downtowns. Albertson’s, 131 Cal.Rptr.2d at 732-34 (walkway at entrance to Albertson’s grocery store, unlike shopping center in Pruneyard, is not a traditional public forum); Trader Joe’s, 86 Cal.Rptr.2d at 448 (“In contrast to Pruneyard, ... [Trader Joe’s] contains no plazas, walkways or central courtyard where patrons may congregate and spend time together.”). As here, people went to Albertson’s and Trader Joe’s solely to shop; the property owners invited members of the public for that purpose alone, not “to meet friends, to eat, to rest, to congregate, or to be entertained at its premises.” Albertson’s, 131 Cal.Rptr.2d at 732; see also Trader Joe’s, 86 Cal.Rptr.2d at 448.

Given the absence of any controlling precedent from the California Supreme Court, we will follow these intermediate appellate decisions. Here, as in a diversity suit, if “an intermediate appellate state court rests its considered judgment upon the rule of law which it announces, that is a datum for ascertaining state law which is not to be disregarded by a federal court unless it is convinced by other persuasive data that the highest court of the state would decide otherwise.” West v. AT & T Co., 311 U.S. 223, 237, 61 S.Ct. 179, 85 L.Ed. 139 (1940); see also Hicks v. Feiock, 485 U.S. 624, 629-30, 108 S.Ct. 1423, 99 L.Ed.2d 721 (1988); Tax Analysts v. IRS, 117 F.3d 607, 614 (D.C.Cir. 1997).

The Board’s and union’s remaining argument is - as WinCo summarizes it - that “any individual or group that has a dispute with the property owner is exempt from the general trespass laws of California.” Petitioner’s Supp. Brief at 4. Lane and Sears II suggested this as a rule, see Lane, 79 Cal.Rptr. 729, 457 P.2d at 563-64, and Sears II, 158 Cal.Rptr. 370, 599 P.2d at 683, but no post-Pruneyard decision by the California appellate courts has adopted it, although one court suggested it in dicta. See Costco, 117 Cal.Rptr.2d at 355 n. 1. Apart from the question whether such a rule would amount to content discrimination,5 in violation of the First Amendment or the California Constitution, the rule is contrary to the decisions of California courts holding that abortion protesters have no right under State law to engage in expressive activities on the privately owned parking lots and walkways of medical clinics providing abortion services. See, e.g., Allred v. Harris, 14 Cal.App.4th 1386, 18 Cal.Rptr.2d 530 (1991).

We hold that the union organizers had no right under California law to engage in handbilling on the privately-owned parking lot of WinCo’s grocery store. The *877case is therefore controlled by the Supreme Court’s decision in Lechmere, Inc. v. NLRB, 502 U.S. 527, 112 S.Ct. 841, 117 L.Ed.2d 79 (1992). Accordingly, WinCo’s petition for judicial review is granted and the Board’s cross-petition for enforcement of its order is denied.

So ordered.