Alan Howard, the billionaire founder of Brevan Howard Asset Management, is building what could be the largest–and most expensive–home in Israel, Israeli news website Ynetnews reports.

Construction on the estate is already underway in Herzliya Pituach, an affluent beachfront neighborhood near Tel Aviv. The estate will reportedly span some 12,000 square feet, and a guest villa will span another 8,000 square feet.

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