Opened in June 2007, the addition to the Williams Research Center provides The Historic New Orleans Collection with increased exhibition and programming space as well as three floors of archival storage. The building is the first new construction completed in the French Quarter since Katrina.

New Orleans architect Davis Jahncke based his design for the addition on a drawing obtained from the New Orleans Notarial Archive. The illustration depicted a hotel, complete with a distinctive rosy-hued façade, that stood on the exact lot in the 1850s. In addition to following the design, Jahncke also implemented several 19th-century building techniques, such as hand-hammered hardware and a false carriageway and chimneys. The result revives the old charm of the French Quarter and demonstrates The Collection’s commitment to architectural preservation.

The new building is located at 535–37 Conti Street, but patrons will enter the new structure through the Williams Research Center at 410 Chartres Street. On the first floor, the multipurpose room, named forThe Collection's first director Boyd Cruise, will host programs and exhibitions. Upstairs, the specialized storage systems include movable shelving and painting racks, humidity and temperature controls, a fire-suppressant system, and a natural-gas generator to assist in maintaining a protective environment.

As part of the WRC, the addition is open Tuesday through Saturday from 9:30 a.m.–4:30 p.m.

View a QTVR panorama of the Vaudechamp exhibition in the Addition.