The grade plane is a reference plane representing the average of finished ground level adjoining the building at exterior walls. Is this statement true or false?

The statement is true because the grade plane serves as an essential reference for understanding the relationship between the building and its surrounding environment. It is defined as the average level of the finished ground, which is typically measured at the exterior walls of a building. This reference is critical for various aspects of construction and inspection, including determining the building's height, assessing drainage, and ensuring compliance with zoning regulations and building codes. By effectively establishing a consistent point of reference, the grade plane helps in evaluating site conditions and making informed decisions during the planning and inspection processes.