This circa-1917 Upper Brookville Colonial was once home to a British intelligence agent and the granddaughter of the man who launched A&P grocery stores, its listing agent says. It is listed for $2.999 million.

The 6,728-square-foot home with five bedrooms and 5.5 baths was previously the carriage house for the 90-acre Farland Estate, which was owned by British intelligence agent Ivar Felix C. Bryce and his wife, Josephine Hartford. Before their purchase, it was known as the Mill River Farm.

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The carriage house is one of four surviving outbuildings, says listing agent Carol Graham of The Corcoran Group. Author and “James Bond” creator Ian Fleming was a visitor after the couple bought the estate, which was designed by architects Guy Lowell and Stanford White.

Over time, the carriage house was transformed into a grand residence situated on two landscaped acres. Original carriage doors with arched windows are found in the formal dining room, which has an original 4-foot-tall wood-burning fireplace and a massive great room, which includes three separate seating areas, a fireplace and a white grand piano. The doors open to the grounds and pool area.

There are 12- to 14-foot-high ceilings throughout the residence and original architectural details such as plaster moldings throughout and wide-plank floors in the great room were preserved during renovations.

An eat-in kitchen with a stamped tin ceiling has a seating area and gas-powered fireplace in addition to a kitchen island and breakfast patio. The kitchen, dining room and entry hall each have radiant heat.

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The royal blue media room, which is next to the great room, has surround sound and an automatic movie screen. A wet bar is in a neighboring room. The black-and-red powder room, part of a his-and-hers pair on the first floor, “looks like something out of Versailles,” Graham says.

A lower level with high ceilings has a wine cellar with room for more than 200 bottles. The property features a stone patio with an in-ground heated swimming pool. Approved plans are in place to add a three-car detached garage with staff quarters above, Graham says.