Some buildings, such as the outbuildings on the Thorn–Dodge property, were destroyed by the 1904 tornado. New construction in the district did not replace any of the historic structures. In 1961 another wing was added to the meeting house. There have been few other changes to the older buildings since then. Among the contributing properties, several are particularly important in the context of the district. None have yet been listed individually on the National Register, but they are all local landmarks, carrying markers indicating what they are and their year of construction. While New Castle's zoning does not include any special measures for the district, the town has other measures to protect and preserve it. Most prominently, all of the historic properties within the historic district have been designated town landmarks. The town's historic preservation ordinances provide for the designation of local landmarks. A Landmarks Advisory Committee, consisting of the town historian and four residents with an interest in preservation and development appointed by the town board to three-year terms, guides the town in not only its designation of landmarks but the preservation of those already designated. Any change to an existing landmark's exterior must be approved by the committee. As allowed under New York state law, property tax exemptions are available to any owner of a landmark who restores or rehabilitates it, if they have been approved in advance by the committee and the town assessor certifies that they were finished as planned.