has listed for $4.2 million, the listing brokerage told The Post. Named “Stormfield,” the 6,300-square-foot property is aptly located at 30 Mark Twain Lane, and sits on 28.53 acres adjoining a 161-acre land trust.The mansion gets its Tuscan look thanks to Twain’s extensive travels in Italy.Twain’s original home burned down in 1923, years after his death.