When it came time for the internationally distinguished interior design icon John Cottrell to seek a country house in Massachusetts, he chose Stillington Hall. The 1923 Henry Davis Sleeper 18th-century-style English Tudor sits atop a halcyon hilltop on 26 private acres overlooking the Atlantic Ocean at Gloucester. He then proceeded to work his magic, blessing the baronial 12,500-square-foot lair with his signature style. New England warmth radiates throughout the post-and-beam showpiece. A vaulted hall and theater, nine unique firesides, an antique yet state-of-the-art kitchen, five endearing main bedrooms, a two-story guesthouse—all bespeak gentrified country life. But most guests agree that of all the settings, it is the great hall and belfry tower that most poignantly reflect the master’s unmistakable touch.