This metadata record describes details of National Park Service (NPS) buildings spatial data contributed to the NPS buildings aggregated dataset by the park unit specified in the NPS Unit element of this metadata record. The data files referred to in this record are the NPS Buildings aggregated point and polygons shapefiles, not the individual park unit shapefiles. The NPS Buildings aggregated point and polygons shapefiles are in the NPS Buildings Data Transfer Standard. This data transfer standard describes a model for buildings depicted using points and polygons. This data set includes both buildings that currently exist as well as sites of those that have been relocated or destroyed. Only features of a non-sensitive nature and freely available to the public are included (although the model has been designed to accommodate sensitive data in the future, if needed). Multiple point and polygon geometries may coexist and are differentiated by point and polygon type. All buildings of interest to the National Park Service are included, including those not owned by the NPS but located within authorized park boundaries and facilities that are leased by the NPS and cooperators which are located outside park boundaries. Only structures with a roof, commonly enclosed by walls, and designed for storage, human occupancy or shelters for animals are included. Other structures not designed for occupancy such as fences or bridges are excluded. Buildings include offices, warehouses, post offices, hospitals, prisons, schools, housing and storage units. Attribute data are intentionally limited to those necessary for spatial data maintenance and stewardship. Data from external database systems are not included. The means to maintain unique identifiers for each building (BuildingID) is through use of Globally Unique Identifiers (GUIDs) assigned by the database. Information about the source and vintage of individual points and polygons are documented within the Edit_Date and Polygon_Notes attributes.