Final answer:
The building's patrol frequency by a fire guard depends on multiple factors including risk level and local regulations, with historically significant buildings benefiting from continuous monitoring to prevent damage.
Step-by-step explanation:
The frequency at which a building should be patrolled by a fire guard is dictated by various factors, including the building's purpose, size, and local regulations. Situations with a high potential for extreme physical danger and uncertainty over serious fire or hazards call for more frequent patrols. Specific protocols are likely in place to ensure the safety of personnel and the preservation of the building itself. It is important that areas with historical significance or where deterioration has been noted, such as a site that has sustained damage from bombing, receive appropriate and continuous monitoring to prevent further damage. The use of 24-hour monitoring through advanced technology like drones, as suggested by Isla and others, may contribute significantly to the timely detection and prevention of human incursions that could lead to fire outbreaks.