 The buildings were added to the District of Columbia Inventory of Historic Sites on January 17, 1990, and the NRHP on September 7, 1994.The pair is also designated as contributing properties to the Greater Fourteenth Street Historic District, listed on the NRHP on November 9, 1994.The Gladstone and Hawarden are Romanesque Revival brick buildings which also feature Queen Anne style elements on the facades.