One day in 2005 while sitting in an open house at one of her listings in Sagaponack North, Sotheby’s agent Dana Trotter took a look around and realized that it was the perfect property for her and her family. A prize-winning equestrienne who rode professionally before entering real estate 18 years ago, the parcel was not only large – three acres – but also had paddocks and a barn that could be perfect for a stable.