This 16-acre Old Westbury compound listed for $12.9 million includes a 10,000-square-foot brick mansion and seven guesthouses.

The seven-bedroom main home with six full baths and three half-baths includes a foyer and center hall entrance with dual staircases, a balcony and 36-foot ceilings.

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The property was converted from a horse farm to a residential compound around 1985; the mansion was built soon after.

There are 10-foot ceilings throughout the home, as well as custom doors, crown moldings, wainscoting, palladium windows, five fireplaces and custom mantels.

Marble and granite are found throughout the residence, which includes an open living-dining room and a conservatory that opens to the property and a pool. The eat-in kitchen boasts updated appliances. Upstairs, the master-bedroom suite includes a stone fireplace and balconies facing the rear of the property.

Outside the gates, the guesthouses range in size from one to four bedrooms. Two barns have been adapted as art studios and gyms, and 10 horse stalls have been preserved, says listing agent Joseph Scavo of Douglas Elliman Real Estate.

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There is space for up to seven cars in two garages.

Grounds include a heated Olympic-size pool, Jacuzzi and a man-made pond with a waterfall, as well as gardens and mature plantings. A brick patio with a pergola includes an outdoor kitchen and a covered dining pavilion.