Manhattan’s 10 highest-grossing high-rise condominiums racked up total sales of more than $2.7 billion over the past year, according to a new ranking by The Real Deal. Leading the pack was Extell Development’s One57, which sold product worth a total of $1.1 billion in the one-year period ending June 2015. That’s $700 million more than its next closest competitor. One57’s perch atop the rankings comes as no surprise, given that a single penthouse there sold to a mystery buyer in January for $100.5 million, the priciest apartment sale in New York City history. In total, 36 units were sold in the skyscraper over the past 12 months. The tower is the subject of a new report from the Independent Budget Office that looks at its 421a abatements.