Fashioned from a 1920s refrigeration warehouse associated with the railroad tracks that once ran across the northern part of the quadrant, the Design Center houses the showrooms of interior designers and decorators and purveyors of building materials for interiors. With the addition of a new glass-sheathed section, the replacement windows, and the rebuilding of the old brick base, Keyes Condon Florance transformed the functional factorylike structure into a showcase. Its massive red-brick facades contrast with the surrounding gray limestone of federal buildings. More recently adorned in a pink and green color scheme, the building reflects a trend of the 1980s.