This 13,000-square-foot mansion on 6.4 acres in Old Westbury, listed for $3,888,888, comes with its own ballroom.

It's now used as a living room, and its tented ceiling is one of many unusual architectural features found throughout this 12-bedroom, nine-bathroom home, says listing agent Ellen Zipes of Daniel Gale Sotheby's International Realty.

Designed by architect William Bottomley, the home was built in the early to mid-1930s for William Goadby Loew, a Manhattan stockbroker and financier.

A 500-foot driveway leads to the courtyard entrance. "As you're coming up and starting up this drive, all of a sudden it opens up and you see this massive home," Zipes says.

Sixteen-foot ceilings are found throughout the home, which was built to accommodate an extensive staff. One wing contains the master bedroom and three additional bedrooms, each with an attached bathroom. Behind that, there are another three bedrooms, two bathrooms and a kitchen for the governess. On the opposite side of the home, there is a staff wing with four bedrooms and a full bathroom.

On the first floor, there is a bedroom and a bathroom. Five fireplaces are in the home, as well as separate men's and women's powder rooms.

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A blend of styles can be found throughout the home, Zipes says. One example is a garden room, which has an Art Deco feel with bamboo moldings and moon and star ceiling moldings in plaster.

The current owner, who bought the home in 1978, changed the facade from stucco to brick, Zipes says. She also added redwood columns, pediment, archways, leaded glass, moldings, stained glass and more, all rescued from the Spaulding/Singer family mansion in upstate Cooperstown.

An in-ground gunite pool, an eight-zone sprinkler system, a patio coming off the kitchen and grass steps in the lawn are all part of the extensive space.

The property is co-listed with Daniel Gale's Jared Zipes.