Terraces and grading, tunnels, paving, traffic control, and fencing are considered part of?

The correct answer pertains to facility grounds, as terraces and grading, tunnels, paving, traffic control, and fencing are all elements that define the exterior environment surrounding a building. These components are crucial for the functionality, safety, and accessibility of a property, serving purposes such as managing drainage, facilitating traffic flow, and delineating property boundaries.

Facility grounds encompass all aspects of landscaping and outdoor infrastructure that enhance the usability and aesthetic appeal of the property, which includes both hardscape elements like paving and softscape features like gardens. This distinction is important, as it recognizes the integral role that the outer environment plays in the whole facility's operation and maintenance.

In contrast, facility structure refers to the main physical framework of the building itself, while building systems relate to the internal mechanisms that support the building's functions, such as HVAC, plumbing, and electrical systems. The building envelope denotes the external layer of a building, encompassing walls, roofs, and windows, which protect from the elements but does not include the broader aspects of the grounds. Thus, the designation of terraces and grading, tunneling, paving, traffic control, and fencing as part of facility grounds aligns perfectly with their roles and functionalities in the built environment.