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DALLAS — The Joule, a luxury hotel located at 1530 Main St. in downtown Dallas, has started a $78 million renovation and expansion. The hotel upgrades will include addition of 31 guest rooms (including two three-story penthouses), a new 8,000-square-foot spa, a 600-square-foot screening room, a 1,350-square-foot recording studio, a second Charlie Palmer restaurant and expanded event spaces. Interior designer Adam Tihany is designing the interior upgrades. Construction is slated for a fall 2012 completion, and the hotel will remain open throughout the renovation.