François I style was originally found in New York City in the late 19th century through the works of Richard Morris Hunt.[8] Hunt was a renowned architect throughout the Northeast, particularly in New England and was one of the first American architects to study at the elite Ecole des Beaux-Arts in Paris, France.[9] C.P.H. Gilbert was an apprentice of Hunt and emulated Hunt's classic Châteauesque style for the Warburg house while also adding some Gothic features.[8] The original house is built in limestone with mansard roofs, dripping moldings, and gables.[10] This architectural style was based on French revivalism and exuded wealth, a point which Felix Warburg wanted to make to his neighbors.