Built in 2000, this Colonial in Old Westbury on the market for $5.95 million features almost 10,000 square feet of space on almost four acres.

The seven-bedroom, eight-bath, two-half-bath custom-built house has his-and-her walk-in closets in the master suite and a double staircase in the main entry hall. Additional details include a paneled library, banquet-sized dining room and an eat-in chef’s kitchen.

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The fully-finished basement includes a gym, and the flat, gated outdoor acreage features a three-car garage, guest quarters, an in-ground pool and a tennis court.

The property is listed with Michael Berman of Automatic Real Estate Associates.