Final answer:
The number of persons for which the means of egress of a building or portion thereof is designed is determined based on building code regulations and factors such as size, height, and restrictions.
Step-by-step explanation:
The subject of this question is Building code regulations.
In the context of building code regulations, the number of persons for which the means of egress of a building or portion thereof is designed refers to the maximum occupancy or capacity allowed in that space. It is determined based on factors such as the size and height of the building, number of rooms, and restrictions on accessory buildings and building setbacks.
Building codes set these requirements to ensure the safety and efficient evacuation of occupants in case of emergencies. Architects and designers must consider these regulations when planning the means of egress in a building to meet the standards set by the local building authorities.