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William continued expanding his estate over the years. Around 1910, he began constructing Eagle’s Nest, a new estate on nearby Northport, transferring some of his art collection from Deepdale. These properties symbolized not only wealth but also his passion for art, architecture, and artistic expression.
In 1920, William inherited his father’s substantial estate after his passing, further solidifying his status as one of America’s wealthiest men. He engaged in various projects, including building a private automobile racetrack and pioneering infrastructural improvements such as the Long Island Motor Parkway, intended for speed and racing.