The borough contained over 500 million square feet (46.5 million m2) of office space in 2015, [8] making it the largest office market in the United States.[9] Midtown Manhattan, with nearly 400 million square feet (37.2 million m2) that same year,[8] is the largest central business district in the world.[10] New York City is distinctive for its high concentrations of advanced service sector firms in the law, accountancy, banking and management consultancy fields.