|Construction of first pair of office buildings designed by George Hadfield for State, War, Navy, and Treasury departments on sites flanking White House.
|Executive office buildings and White House partially burned by British troops in War of 1812.
|Commission formed to recommend a site for combined State, War, and Navy Building and to procure designs and cost estimates.
|Single new building on site of old War and Navy Department buildings proposed by Grant administration to house State, War, and Navy Departments. Design by Alfred B. Mullett accepted.
|Congress approves project and initial appropriation; ground broken for construction of south wing (State Department)
|Individual telephone service available for State and Navy Departments.
|Conference establishing International Dateline and Greenwich Mean Time held in State Department.
|West and center wings completed.
|First light bulb used in building.
|Theodore Roosevelt appointed Assistant Secretary of the Navy under John D. Long. Holds office in Room 278, State, War, and Navy Building (SWN).
|In room 208, SWN, Secretary of State John Hay hands the Spanish Ambassador his passport and credentials, thus signifying United States declaration of war against Spain.
|Gas removed and first electric system installed throughout the building.
|Navy Department vacates SWN.
|The "Round the World Flyers" decorated by Secretary of War Dwight Davis.
|SWN renamed the Department of State Building.
|Bureau of Budget moves in from Treasury.
|In room 208, Cordell Hull confronts Japanese envoys with evidence of the bombing of Pearl Harbor.
|State Department vacates building.
|State Department Building renamed Executive Office Building.
|First presidential press conference in Indian Treaty Room.
|Executive Office Building placed on the National Register of Historic Places.
|Executive Office Building registered as landmark property on the District of Columbia Inventory of Historic Sites.
|Historic Restoration of the Old Executive Office Building to its appearance at time of completion begins.