Historic Preservation Staff has a survey that contains which structures are contributing and which structures are noncontributing.
Contributing buildings mean structures that "contribute" to the historic and architectural character of the Historic District and that fall within the period of significance. These are considered more significant historically and architecturally and should be rehabilitated following the specific guidelines for contributing structures. The regulations for alterations and additions to contributing buildings are firmer than those for noncontributing buildings.
Noncontributing buildings were deemed “noncontributing” to the historic and architectural character of the Historic District at the time they were surveyed, but some noncontributing buildings may now be considered historic. The regulations for alterations and additions to noncontributing buildings are more flexible than those for contributing buildings; however, regulations for historic, noncontributing structures may be considered more carefully.