Cal. Rev. & Tax. Code § 7280
(b) For purposes of this section, the term “the privilege of occupying a room or rooms, or other living space, in a hotel, inn, tourist home or house, motel, or other lodging” does not include the right of an owner of a time-share estate in a room or rooms in a time-share project, or the owner of a membership camping contract in a camping site at a campground, or the guest of the owner, to occupy the room, rooms, camping site, or other real property in which the owner retains that interest.
(3) “Guest of that owner” means a person who does either of the following:
(A) Occupies real property accompanied by the owner of either of the following:
For purposes of this subdivision:
(c) For purposes of this section, “other lodging” includes, but is not limited to, a camping site or a space at a campground or recreational vehicle park, but does not include any of the following:
(e)
(1)
(A) If the legislative body of a city, county, or city and county elects to exempt from a tax imposed pursuant to this section any of the following persons whose occupancy is for the official business of their employers, the legislative body shall create a standard form to claim this exemption and the officer or employee claiming the exemption shall sign the form under penalty of perjury:
(B) The standard form described in subparagraph (A) shall contain a requirement that the employee or officer claiming the exemption provide to the property owner one of the following, as determined by the legislative body of the city, county, or city and county imposing the tax, as conclusive evidence that his or her occupancy is for the official business of his or her employer: