GREATER BOSTON AND CAPE COLD

Perhaps no city is struggling as hard with the limitations of its convention and exhibition space as is Boston. Its three convention centers have little more than half a million square feet of exhibit space combined; in the convention wars, that much in even one building doesn't cut it. "We rank 45th in size nationwide," says Patrick Moscaritolo, president and CEO of the Greater Boston Convention & Visitors Bureau, referring to Boston's principal convention center, the Hynes Convention