Among the largest estates ever amassed on Long Island was the enormous Renaissance –style mansion known as Harbor Hill designed in 1899 by Stanford White and built in 1900 to 1902 for Clarence H. Mackay and his wife Katherine. After 1902, a large Gothic carriage house and stables were designed by Warren & Wetmore and built near the mansion. Later, the building served as a garage for Mackay's automobiles.

Along with the Harbor Hill mansion, the building was demolished in April 1947.

“Not only was the scale of the building impressive but its architecture verged on the fantastic...included a miniature campanile at center.” Source: The Architecture of Warren & Wetmore by Peter Pennoyer and Anne Walker

Circa 1927. Courtesy of the Cradle of Aviation.

Entrance to the carriage house and stables.

Overlay of the buildings on the map of East Hills. The carriage house & stables can be seen in the middle of the aerial on today’s Redwood Drive.