 The Oatlands property is composed of the main mansion and 415 acres (168.0 ha) of farmland and gardens.The house is judged one of the finest Federal period country estate houses in the nation.On the property, in addition to the Mansion, are a number of outbuildings, including the Carriage House, Bachelor's Cottage, several barns and farm buildings, and a greenhouse, built in 1810, said to be the oldest standing greenhouse in the South.