What is the difference between “contributing” and “non-contributing” in an Historic District?

In an historic district, buildings are designated as either contributing or non-contributing.

Contributing resources date from the historic period of significance established for the district. They contribute to the significance and character of the district through their historical associations and/or architectural values.

Non-contributing resources are those that, due to date of construction, alterations, or other factors, do not contribute to the district’s historic significance or character. The zoning regulations that apply in a historic district generally differ for contributing and non contributing properties.
Additional information can be obtained from the  City of Portland’s Historic District Website.

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