After renovations were underway, the plans were broadened in an effort to restore much of the building's original elegance.[38] Many of the building's exceptional architectural features were restored: porticos modeled after the Parthenon in Athens, a curving double staircase, colonnades, vaulted galleries, large windows, and skylights as long as a city block.[39][40][7] New features added to the building included the Lunder Conservation Center, the Luce Foundation Center for American Art, Nan Tucker McEvoy Auditorium, and the Robert and Arlene Kogod Courtyard.[40] Meanwhile, the museum's offices, library, and storage were moved to the nearby Victor Building, freeing up valuable space and allowing the museum to display four times as many artworks as before.[5][41] The renovation ultimately took six years and $283 million.[42] The museum and the National Portrait Gallery reopened their combined building, renamed as the Donald W. Reynolds Center for American Art and Portraiture, on July 1, 2006.[43]