"Restoration" in the context of buildings refers to a specific treatment approach within the field of architectural conservation. It involves the act or process of accurately representing the form, features, and character of a property as it appeared during a specific period. This is achieved by removing features from other periods in the property's history and reconstructing missing features from the restoration period. Restoration may also involve limited and sensitive updating of mechanical, electrical, and plumbing systems, and other code-required work to ensure the functionality of the property. In the United States, restoration differs from preservation or conservation as it allows for the removal of historic materials to depict a specific time period accurately, not necessarily the property's original or final time periods.