What does sub-structure or foundation data refer to?

Sub-structure or foundation data specifically pertains to the components of a building that are located below grade level, such as the foundation, basement, or any supporting structures buried beneath the ground. This information is crucial for understanding the integrity and safety of a property, as it involves the foundational elements that support the entire building above ground.

When assessing a property's structural integrity, details about the sub-structure provide insight into how well the building is supported and any potential issues that could arise from the foundation's condition, such as settling, water damage, or structural failures.

Other options, while related to real estate and its analysis, do not pertain to sub-structures. For example, information about a building's exterior features relates to its aesthetic and functional aspects above ground. Details about the property's zoning classification pertain to the legal usage of the land and what can be built on it, which is not directly related to its physical foundation. Lastly, data concerning the property's appraisal history deals with its market value over time and does not involve the physical construction elements of the building. Therefore, the focus on below-grade components clearly aligns with the definition of sub-structure data.