U.S. Secretary of the Interior James G. Watt subsequently designated it a National Historic Landmark on December 17, 1982. It is the only listing or designation in a foreign country, excluding those in countries that grew out of the Trust Territory of the Pacific Islands. The building has been listed on the U.S. Secretary of State's Register of Culturally Significant Property, a listing of State Department properties around the world that have particular cultural or historical significance.