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GUIDELINES FOR SELECTING BOUNDARIES ALL PROPERTIES • Carefully select boundaries to encompass, but not to exceed, the full extent of the significant resources and land area making up the property. • The area to be registered should be large enough to include all historic features of the property, but should not include "buffer zones" or acreage not directly contributing to the significance of the property. • Leave out peripheral areas of the property that no longer retain integrity, due to subdivision, development, or other changes. • "Donut holes" are not allowed. No area or resources within a set of boundaries may be excluded from listing in the National Register. Identify nonhistoric resources within the boundaries as noncontributing. • Use the following features to mark the boundaries: 1. Legally recorded boundary lines. 2. Natural topographic features, such as ridges, valleys, rivers, and forests. 3. Manmade features, such as stone walls; hedgerows; the curblines of highways, streets, and roads; areas of new construction. 4. For large properties, topographic features, contour lines, and section lines marked on USGS maps. BUILDINGS, STRUCTURES AND OBJECTS • Select boundaries that encompass the entire resource, with historic and contemporary additions. Include any surrounding land historically associated with the resource that retains its historic integrity and contributes to the property's historic significance. • For objects, such as sculpture, and structures, such as ships, boats, and railroad cars and locomotives, the boundaries may be the land or water occupied by the resource without any surroundings. For urban and suburban properties that retain their historic boundaries and integrity, use the legally re- corded parcel number or lot lines. • Boundaries for rural properties may be based on: I. A small parcel drawn to immediately encompass the significant resources, including outbuildings and associated setting, or 2. Acreage, including fields, forests, and open range, that was associated with the property historically and conveys the property's historic setting. (This area must have historic integrity and contribute to the property's historic significance.) HISTORIC SITES • For historic sites, select boundaries that encompass the area where the historic events took place. Include only portions of the site retaining historic integrity and documented to have been directly associated with the event. HISTORIC AND ARCHITECTURAL DISTRICTS • Select boundaries to encompass the single area of land containing the significant concentration of buildings, sites, structures, or objects making up the district. The district's significance and historic integrity should help determine the boundaries. Consider the following factors: 1. Visual barriers that mark a change in the historic character of the area or that break the continuity of the district, such as new construction, highways, or development of a different character. 2. Visual changes in the character of the area due to different architectural styles, types or periods, or to a decline in the concentration of contributing resources. 56