A more than a century old palatial townhouse owned by 's wealthiest man Carlos Slim Helu has gone on the market for a record $80 million after a failed attempt to sell the property in 2015.The Telcom billionaire, who was once listed as the richest man in the world, according to , is taking another shot at parting with the 20,000 square-foot mansion located at 1009 Fifth Avenue on Manhattan's ritzy Upper East Side.Also known as the Benjamin N. Duke House, realtors have called the sale a 'rare opportunity to acquire a piece of history' and if sold would break the record for the most expensive townhouse ever sold in .
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