The Commission or interested party shall prepare a nomination report for each proposed district or structure. For Historic Conservation Overlay District designations, the report shall include a building-by-building inventory of all properties within the district, photographs of representative properties within the district, a property map of the district showing boundaries and tax parcel, a physical description and statement of significance for the district and a property tax parcel listing. For historic structure designations, the report shall include one or more photographs, the tax lot and block number of the property and a physical description and a statement of significance.