The massive two-story library at what has in recent years been called Ellison Bay manor. Photo courtesy Jameson Sotheby's International Realty in Chicago. Credit: USA TODAY NETWORK-Wisconsin

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What is believed to be the largest single-family home in Wisconsin, located in Ellison Bay, sold in December.

The approximately 35,000-square-foot mansion was built by philanthropist Judith Blazer, whose grandfather founded Miller Electric. Miller Electric is now part of Illinois Tool Works.

The home was completed in 1996 and is located at 2177 Porcupine Bay Road in Ellison Bay. In 2005 Frank Spitzer of Huntington Park, Calif., bought the mansion for about $20 million.

True North Real Estate in Fish Creek handled the sale. The real estate company had the home listed for 256 days before the sale was finalized Dec. 15.

Door County Land Records lists the accessed value of the home at $7.085 million. According to someone with knowledge of the sale, the home sold for $2.7 million. The asking price for the 43-room mansion was $2.9 million.

The Door County online land records database lists the previous owner of the property as the Frank Spitzer Estate. The new owner is identified in records as New North Realty LLC.