Warder Mansion is an apartment complex at 2633 16th Street Northwest, in the Meridian Hill neighborhood of Washington, D.C. It is the only surviving building in the city designed by architect Henry Hobson Richardson. In an early example of preservation commitment, the building was saved from demolition in the 1920s by being disassembled and moved 1.5 miles (2.4 km) north of its original site. In the 1990s, the Warder-Totten House's prospects for survival again looked bleak, but the building was saved a second time.

16th Street Northwest, briefly known as the Avenue of the Presidents, is a prominent north-south boulevard in Washington, D.C., located in Northwest D.C. The street was laid out as part of the 1791 L'Enfant Plan, which served as the original blueprint for the city. The street begins just north of the White House, across from Lafayette Square in the President's Park, and continues north along the Washington meridian until Blair Circle.