The Official Site for The Historical Society of the Somerset Hills (THSSH)

Hillandale under Construction

July 11, 2025July 11, 2025 by Editorial Staff 1 Comment

The Hillandale mansion was designed by architect Grosvenor Atterbury for George Rudolf Mosle and completed in 1906. The main mansion measured 130 feet by 45 feet and was constructed of stone, brick and steel with a tile roof. Notice the “roof tree” on the ridge placed by workmen for good luck. The estate totaled 620

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Hillandale Demolished

July 15, 2024July 15, 2024 by Editorial Staff 7 Comments

“Hillandale” on the Mendham Township/Gladstone border was built in 1906 by architect Grosvenor Atterbury for George Rudolf Mosle (1865-1941), who made his fortune in the sugar industry. In 1926, the mansion was sold to the Sisters of St. John the Baptist, the same order who later owned Blairsden in Peapack. The sisters operated an orphanage

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