Which of the following is NOT a requirement for historic site classification?

The classification of historic sites requires specific criteria to ensure they meet certain standards of preservation and public accessibility. One significant requirement is that a site must be listed in the New Jersey Register of Historic Places, as this designation affirms its recognized historic value. Additionally, adherence to the Secretary of the Interior's guidelines is critical for maintaining the integrity and authenticity of the site, ensuring that any modifications or restorations respect the historical significance of the property.

Another requirement is that the site be open to the public for a minimum of 96 days each year, which helps promote public engagement and education about the site’s historical importance.

The requirement that the site must be privately owned is not a standard for achieving historic site classification. In fact, many historic sites are publicly owned and maintained by government agencies or nonprofit organizations dedicated to preserving history. As such, private ownership does not factor into the classification criteria, which focuses more on historical significance, public access, and adherence to preservation standards. This makes private ownership an irrelevant consideration in the context of the requirements for historic site classification.