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He envisioned a grand estate that rivaled the summer homes of Newport and North Shore. Collaborating with Boston architects Chapman & Fraser, Stone designed a stunning Tudor-style castle inspired by English country houses. Construction took place between 1909 and 1911, and what rose on Great Hill was a majestic "castle" constructed from locally sourced blue-gray stone called "Heiden stone"—a clever homage to his own family name with a subtle pun embedded in the choice of material.
The design reflected a romanticized medieval aesthetic, akin to the Compton Wynyates castle from 16th-century England. The estate’s features included turrets, gables, and irregularly shaped windows that made it look as if it had been standing for centuries, blending history and fantasy seamlessly.