On May 14, 1921, the territorial legislature of Hawaii purchased Washington Place for $55,000 from the estate of Queen Liliuokalani to serve as the Executive Mansion of the Territorial Governor of Hawaii. It was remodeled in 1922 by Governor Wallace Rider Farrington. In all, it was the residence of twelve territorial and state governors of Hawaii. Technically, it was the residence of thirteen governors, because John Owen Dominis, Liliuokalani's consort, had been Governor of the island of Oahu from 1868 to 1891. The house served in this role until 2002, when it was converted into a historic house museum. It was listed on the National Register of Historic Places on June 18, 1973, and was designated a National Historic Landmark on March 29, 2007.