Seaside Plantation House  Seaside Plantation House, also known as Locksley Hall, is a historic plantation house located at Edisto Island, Colleton County, South Carolina. It was built about 1810, and is a 2 1/2-story, Federal style brick dwelling with a gable roof. The house is one room deep with a long porch across the southeast elevation and sits on a raised basement. The central portion of the house is stuccoed brick with frame additions on the first floor. It was listed in the National Register of Historic Places in 1982.