It is a 12-acre (4.9 ha) district roughly bounded by Whitehead, Eaton, and Caroline Streets. It included 23 structures built during 1845–1923, one built in 1942, four fresh water cisterns and four elevated storage tanks.[2]
The Naval Station included an area known as the Truman Annex, an area including officer's quarters and the "Little White House" where President Harry S Truman occasionally vacationed.