What is a requirement for historic properties according to the Secretary of the Interior’s Treatment guidelines?

Historic properties, as per the Secretary of the Interior’s Treatment guidelines, are encouraged to be open to the public to promote education and appreciation of cultural heritage. This requirement reflects the intent to engage the community and provide access to historical resources that enrich the understanding of history and heritage. By being open to the public, these properties serve as valuable learning environments, helping to foster a connection between the past and present.

The other choices do not accurately reflect the guidelines. For instance, properties do not have to be fully restored as preservation can often involve maintaining existing conditions rather than complete restoration. Additionally, there is no stipulation that they must not charge an entry fee or that they must be confined to urban areas, allowing for flexibility in terms of location and funding.