This property has been on the market for a while; it had been asking $4.6M but the price has been chopped down to $4.3M. It's one of the Houses at Sagaponac, an ambitious development of modern homes from the beginning of the 2000s, which was intended to serve as a museum of architecture, but never completed.
This house was designed by Hariri & Hariri, who said the house was inspired by Giacometti's sculpture titled "Figure in a Box Between Two Boxes, which are houses." (Hey, sure, why not.) It's an L-shaped one-story house, with two wings surrounding a central terrace with a pool. There is 5,000-square-feet with five bedrooms and 6.5 baths. A finished lower level boasts a home theater and gym, and there's a separate guest house/art studio, as well as a two-car garage. There's 2.72 acres of land with a tennis court.