A. It is unlawful to use a camping trailer, motorhome, camper, or travel trailer for living or sleeping purposes except when parked within a licensed recreational vehicle park or mobilehome park, as provided elsewhere in this title, or when used on a temporary basis not to exceed a period of seven days by guests or visitors of residents of the City and said vehicle is parked upon the property of the resident.

B. It is unlawful to use a trailer, excluding commercial coach units, as a business office in any zone; except, that a general contractor and/or property owner or lessee may obtain a temporary permit for the parking of one or more mobilehomes, motorhomes, campers or travel trailers for watchmen, supervisory or other special personnel, or for use as a temporary office at or immediately adjoining a major construction site upon commencement of such construction. Any such permit shall be issued only by the Director of Development Services, or designee, after an application, in writing, is submitted by the general contractor specifying:

C. Commercial coach units may be utilized for a maximum of 25 percent of the total industrial and/or commercial floor area available to a particular use; provided, that if visible from a public street or from adjoining properties, the coach units shall be made architecturally compatible with and complementary to the balance of the structures on the same and adjacent sites.

D. Commercial coach units may be utilized as temporary building space in conjunction with public or quasi-public uses located in residential zones, and in conjunction with public, quasi-public, and private uses, such as banks, insurance offices, savings and loan institutions, public utility offices, and similar public-service-based uses in commercial and industrial zones; provided, that a conditional use permit is procured for each commercial coach so utilized. All conditional use permits granted for the utilization of commercial coaches as temporary building space shall be limited to a period of not more than two years; provided, however, that the permittee may apply to the Zoning Administrator for an extension of time, which the Zoning Administrator may grant for a maximum of one additional year.

E. A mobilehome, certified under the National Mobile Home Construction and Safety Standards Act of 1974 (USC Section 5401, et seq.), may be placed on a permanent foundation on a private lot in the A and R-1 zones and on lots designated for single-family detached dwelling units in the P-C zone; provided, that: