rule requiring that rooms in adult entertainment establishments be at least 1000 square feet in area. These rules are content-neutral because the City enacted them not to suppress the expressive content of nude dancing, but to alleviate the harmful secondary effects with which adult businesses are commonly associated.
First we must choose which test applies to these regulations. There are two possibilities. The first is the “time, place, or manner” test the Supreme Court used to evaluate the zoning regulations in City of Renton. The Court initially developed this test to review restrictions on expression taking place in public fora, but in City of Renton, it used this test to evaluate the validity of zoning regulations. See Barnes, 501 U.S. at 566, 111 S.Ct. 2456 (plurality opinion) (citing Ward v. Rock Against Racism, 491 U.S. 781, 791, 109 S.Ct. 2746, 105 L.Ed.2d 661 (1989), and City of Renton, 475 U.S. 41, 106 S.Ct. 925, 89 L.Ed.2d 29). City of Renton says that a “time, place, or manner” regulation must be narrowly tailored to serve a substantial government interest, and it must allow for reasonable alternative avenues of expression. See 475 U.S. at 50-54, 106 S.Ct. 925; Int'l Eateries, 941 F.2d at 1161-65.
The alternative is the four-part test the Court laid out in United States v. O’Brien, 391 U.S. 367, 88 S.Ct. 1673, 20 L.Ed.2d 672 (1968). This test has been used to evaluate regulations of expressive conduct — conduct that contains both “speech” and “nonspeech” elements. Id. at 376, 88 S.Ct. 1673. In Barnes v. Glen Theatre, Inc., 501 U.S. 560, 111 S.Ct. 2456, 115 L.Ed.2d 504 (plurality opinion), both the plurality and Justice Souter, see id. at 581, 111 S.Ct. 2456 (Souter, J., concurring in the judgment), used this test to resolve a challenge by nude dancing establishments to a state law that banned public nudity. The test permits government regulation of expressive conduct “if it is within the constitutional power of the Government; if it furthers an important or substantial governmental interest; if the governmental interest is unrelated to the suppression of free expression; and if the incidental restriction on alleged First Amendment freedoms is no greater than is essential to the furtherance of that interest.” O’Brien, 391 U.S. at 377, 88 S.Ct. 1673.
The Supreme Court has observed that the expressive conduct test of O’Brien and Barnes and the “time, place, or manner” test of City of Renton “embody much the same standards.” Barnes, 501 U.S. at 566, 111 S.Ct. 2456 (plurality opinion) (discussing Clark v. Community for Creative Non-Violence, 468 U.S. 288, 298 & n. 8, 104 S.Ct. 3065, 82 L.Ed.2d 221 (1984)). Still, which test we choose at least determines how we approach these questions, even if it doesn’t affect the outcome. And for that matter, our choice of which test to use may occasionally be outcome determinative. In Ward, for instance, a “time, place, or manner” case, the Court said that the means chosen are narrowly tailored as long as they are “not substantially broader than necessary to achieve the government’s interest.” 491 U.S. at 800, 109 S.Ct. 2746. Contrast this with O’Brien, in which the Court said that regulation of expressive conduct may be “no greater than is essential to the furtherance of [the government’s] interest.” 391 U.S. at 377, 88 S.Ct. 1673. The Court is surely right to suggest that these tests are generally the same. See Clark, 468 U.S. at 298, 104 S.Ct. 3065 (O’Brien’s, four-part test, “in the last analysis, is little, if any, different from the standard applied to time, place, or manner restrictions”). But in the occasional case, there may be a difference between “not substantially broader” and “no greater than is essential.”
We need not decide whether this is that occasional case. We decide only one case at a time, and in this case, City of Renton guides our inquiry. The City of Renton test is appropriate because the rules we consider today — the hours of operation and 1000 square foot provisions — regulate “time” and “place” in the “time, place, or manner” sense. They affect, but do not directly regulate, the expressive conduct that is the basis of the plaintiffs’ First