Trader Joe’s is considering locating a $78.5 million regional distribution facility in Bloomfield and bringing with it 675 new jobs, a prospect the town mayor welcomed Thursday. In a Nov. 29 letter to the town planner, George A. Tobjy, managing director for New York City-based KPMG, said the grocer is weighing possible locations for the facility in Connecticut and New York. The project would encompass a 690,000-square-foot warehouse, which will include 90,000 square feet of frozen food storage, some light manufacturing including cheese cutting and produce packaging, the letter states. The company is seeking a 100 percent property tax abatement for seven years, among other considerations, from Bloomfield, a possible sticking point, Mayor Joan A. Gamble said.