de Seversky Mansion

Set on the historic Gold Coast of Long Island in Old Westbury, the NYIT de Seversky Mansion is a grand early-20th-century estate that today serves as an event venue on the Long Island campus of New York Institute of Technology. Surrounded by landscaped grounds and gardens, the mansion preserves the atmosphere of the elaborate country estates that once characterized this part of Nassau County.

The mansion was built for Alfred I. du Pont, a member of the prominent du Pont family, and was designed by noted architect Thomas Hastings, whose work also included the New York Public Library’s main building on Fifth Avenue. New York Tech identifies the mansion as having been completed in 1918, although some university historical material dates its commission to 1916.

The property later became associated with C.Z. Guest, the celebrated socialite, equestrian and fashion figure who lived on the Gold Coast estate known as Templeton. It subsequently became part of New York Institute of Technology’s Old Westbury campus and was named for Major Alexander P. de Seversky, the aviation pioneer, aircraft designer and former New York Tech trustee.

A Gold Coast Mansion

The mansion reflects the wealth and elaborate country-house lifestyle that transformed Long Island’s North Shore during the Gold Coast era. Its formal interiors include a marble foyer, grand staircase, mosaic details, ballroom and a collection of furnished rooms used for receptions, dining and other gatherings. The surrounding property provides gardens, lawns and outdoor spaces that remain an important part of the estate’s character.

Today, de Seversky Mansion is operated as a division of New York Institute of Technology and is used primarily for weddings, corporate functions, milestone celebrations and university events. Indoor and outdoor spaces can accommodate gatherings ranging from smaller celebrations to events with as many as approximately 300 adult guests, depending on the event and configuration.

The mansion is also more than an event facility. Its preservation provides visitors with a surviving example of the estates that once lined Long Island’s North Shore, while its continued use keeps the historic property active rather than simply preserving it as a static reminder of the Gold Coast period.

NYIT de Seversky Mansion

Key Facts & Details

With its grand architecture, landscaped grounds and ties to some of the prominent figures of Long Island’s Gold Coast era, de Seversky Mansion remains one of Old Westbury’s notable historic estates. Its continued use for weddings, celebrations and university events gives visitors an opportunity to experience a surviving Gold Coast mansion much as it was intended: as an elegant setting for gatherings and social occasions.