shall mean any improvement, archaeological site, natural feature or property that has special historical, cultural, aesthetic, or architectural character, interest, or value as part of the development, heritage, or history of the city of Covina, the state of California, or the nation and that has been nominated and designated by the city council with owner consent pursuant to CMC §
17.81.050. The designation statement shall specify the significant exterior and interior elements and natural features which are expressly found by the planning commission to contribute to the historic landmark's significance. Unless otherwise stated in the designation statement, the protection afforded an historic landmark shall encompass the entire parcel and any adjoining parcels under the same ownership.