Echo Lawn Estate, also known as Stonegate after the Great War, is a historic estate located at Balmville in Orange County, New York. The main house was built about 1860 and is a two-story brick dwelling in the Second Empire style. It features sweeping concave mansard-type roofs. Also on the property is a cluster of mid-19th-century service buildings, an early 20th-century formal garden, and a substantial set of Arts and Crafts inspired gateposts and stone walls. It was listed on the National Register of Historic Places in 2009.