Warder Mansion (also known as Warder-Totten House) is an apartment complex at 2633 16th Street Northwest, in the Meridian Hill neighborhood of Washington, D.C.

[2] 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.

Architect George Oakley Totten Jr. bought the exterior stone (except the front doorway, which reportedly went to the Smithsonian) and much of the interior woodwork.

Warder's daughter Alice (1877–1952) married diplomat John Work Garrett (1872–1942) at the house in December 1908, with First Lady Edith Roosevelt in attendance.

Evergreen eventually became Johns Hopkins University's Evergreen Museum & Library; its Warder pieces include a set of three Thomas Sheraton-inspired chairs and an ornately inlaid center table from the D.C. house's drawing room, and a handsome pair of possibly-architect-designed "throne" chairs carved with sunflowers, an ornate "W," and the year 1887.