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20.36.070 833 (Pleasanton Supp. No. 29, 1-23) or other evidence of their identity and authority. If the representative is refused admittance an inspection war- rant shall be procured. (Prior code § 2-12.80) 20.36.070 Definitions. For the purposes of this chapter, the following definitions shall apply: A. “Commercial buildings” means any building used in the conduct of a business or for the storage of merchandise, household goods or produce. B. “Cylinder guard” means a hardened ring surrounding the exposed portion of the lock cylinder or other device which is so fastened as to protect the cylin- der from wrenching, prying, cutting or pulling by attack tools. C. “Dead bolt” means a bolt that has no auto- matic spring action and is operated by a key cylinder, thumbturn or lever. D. “Insert” means a hardened steel roller inside unhardened bolts to prevent bolt cutting or sawing with common tools. E. “Transom” means an area above a doorway that can be opened, such as a hinged window or lou- vered windows. F. “Owner” means any person, firm or corpora- tion having a legal or equitable interest in the property, or a power of agency therein. G. “Residential unit” means any building or portion of building used for habitation, including motels, hotels, single-family dwellings, apartments, townhouses, condominiums and guest rooms. H. “Hours of darkness” means that period commencing with sunset and continuing to sunrise. (Prior code § 2-12.81) 20.36.080 Commercial buildings—Doors. Each exterior door shall be secured as follows: A. Single doors shall be equipped with a single dead bolt with a turnpiece with a minimum throw of one inch. A hook or expanding bolt may have a throw of three-fourths inch. A dead bolt must contain an insert of hardened steel to resist attempts at cutting through the bolt. B. On pairs of doors, the active leaf shall be equipped with the type lock required for single doors in subsection A of this section. The inactive leaf shall be equipped with flush bolts protected by hardened material with a minimum throw of five-eighths inch at the top and bottom. C. Cylinders used shall be so designed or pro- tected with hardened cylinder guards that they cannot be gripped by pliers or other wrenching devices. D. Rolling overhead, solid overhead, swinging, sliding or accordion-type doors shall be equipped with a cylinder lock or padlock when not operated by electric power. If a padlock is used it shall have a minimum of one-quarter inch diameter hardened steel shackle and hardened steel hasp attached by bolts. E. Metal accordion grate or grill-type doors shall be equipped with metal guide track at top and bot- tom, and either a cylinder lock or a padlock with hard- ened steel shackle and minimum five pin tumbler opera- tion with nonremovable key when in an unlocked posi- tion. The bottom track shall be so designed that the door cannot be lifted from the track when the door is in a locked position. F. Outside pin-type hinges on all exterior doors shall be provided with nonremovable pins and shall have jamb pins which project through both hinge leaves and prevent removal of the door if the pin is removed from the hinge. Jamb pins shall be not less than three- sixteenths inch diameter steel and shall project into the door and jamb not less than one-fourth inch. (Jamb pins are not required for hinges which are shaped to prevent removal of the door when the hinge pin is removed.) G. Glazed panels in doors or adjacent to the door frame shall be approved burglary-resistant material. H. Sliding doors shall have the movable section of the door sliding on the inside of the fixed portion of the door, or secondary lock, if sliding on outside of fixed portion. I. Sliding doors and windows shall be de- signed to prevent removal by lifting when in a closed or partially closed position. J. Locks shall be provided on sliding doors. Mounting screws for the lock case shall be inaccessible from the outside. Lock bolts shall be of hardened steel or have hardened steel inserts. The lock bolt shall engage the strike sufficiently to prevent its being disengaged by any possible movement of the door within the space or clearances provided for installation and operation. The strike area shall be of material adequate to maintain ef- fectiveness of bolt strength. K. Doorjambs shall be constructed or protected to prevent violation of the function of the strike. L. Lighting shall be so designed that all exte- rior doors will be well illuminated throughout the hours of darkness. Lighting fixtures shall be protected against tampering and breakage. (Prior code § 2-12.82) 20.36.090 Commercial buildings—Windows and other openings. Each of the following types of openings shall be secured as follows: