Belmont, Cal., Code of Ordinances ch. 20.5 § 20.5-7

(a) No person, employer, business, nonprofit entity, landlord, or common interest development shall knowingly permit the smoking in an area which is under the legal or de facto control of the person, employer, business, nonprofit entity, landlord, or common interest development and in which smoking is prohibited by law and the person, employer, business, nonprofit entity, landlord, or common interest development is not otherwise compelled to act under state or federal law.
(b) No person, employer, business, nonprofit entity, landlord, or common interest development shall knowingly or intentionally permit the presence or placement of ash receptacles, such as, for example, ash trays or ash cans, within an area which is under the legal or de facto control of the person, employer, business, nonprofit entity, landlord, or common interest development and in which smoking is prohibited, including, without limitation, inside the perimeter of any reasonable distance required by this chapter.
(c) Notwithstanding any other provision of this chapter, any owner, employer, business, nonprofit entity, landlord, common interest development or other person who controls any property, establishment, place of employment, public place, or multi-unit residence regulated by this chapter may declare any part of such area in which smoking would otherwise be permitted to be a nonsmoking area.
(d) "No Smoking" signs, with letters of no less than one inch in height or the international "No Smoking" symbol (consisting of a pictorial representation of a burning cigarette enclosed in a red circle crossed by a red bar) shall be clearly, sufficiently, and conspicuously posted in every indoor and outdoor place in which smoking is prohibited by this chapter, by the person, employer, business, nonprofit entity, landlord, or common interest development that has legal or de facto control of such place. At least one sign with the City of Belmont phone number where complaints can be directed must be conspicuously posted in every place in which smoking is prohibited. For purposes of this chapter, the city manager or designee shall be responsible for the posting of signs in regulated facilities owned or leased in part by the City of Belmont. Notwithstanding this provision, the presence or absence of signs shall not be a defense to the violation of any other provision of this chapter.