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Nearly a century later, in 1957, the Ethyl Corporation purchased six acres of property atop Gambles Hill, including Pratt's Castle. Pratt's Castle was ultimately destroyed and replaced with the Ethyl Corporation Building, a Classical Revival structure designed by Carneal and Johnston architects, and a landscape by Charles Gillette. Alluding to the history of the neighborhood the Ethyl Corporation wanted to the complex to be a campus with various landscape architecture elements. Landscape architecture Gillette designed an open lawn lined with crape myrtles and a buffer of perimeter shrubs. To the rear of the building, Gillette installed a rectilinear garden with symmetrical parterres lined by oaks, magnolias, and brick walks. The structure still stands today and takes up a majority of the neighborhood. Several empty fields around the property remain open, where old neighborhoods were demolished.