Cases recognize three types of government-controlled spaces: traditional public forums, designated public forums, and nonpublic forums. In a traditional public forum-parks, streets, sidewalks, and the like-the government may impose reasonable time, place, and manner restrictions on private speech, but restrictions based on content must satisfy strict scrutiny, and those based on viewpoint are prohibited. See Pleasant Grove City v. Summum, 555 U. S. 460, 469, 129 S. Ct. 1125, 172 L. Ed. 2d 853 (2009). The same standards apply in designated public forums-spaces that have “not traditionally been regarded as a public forum” but which the government has “intentionally opened up for that purpose.” Id., at 469-470, 129 S. Ct. 112, 172 L. Ed. 2d 853, 862. In a nonpublic forum, on the other hand-a space that “is not by tradition or designation a forum for public communication”-the government has much more flexibility to craft rules limiting speech. Perry Ed. Assn. v. Perry Local Educators’ Assn., 460 U. S. 37, 46, 103 S. Ct. 948, 74 L. Ed. 2d 794, 805 (1983). The government may reserve such a forum “for its intended purposes, communicative or otherwise, as long as the regulation on speech is reasonable ...