First, there's Arthur Mirante, former CEO of Cushman & Wakefield, who is now heading the New York office of Avison Young. He serves as Avison's tristate president and aims to make Avison one of the top five brokerages in Manhattan in the coming years by luring talent and enhancing marketing and research. Joseph Harbert, Cushman's former COO who is now the president of Colliers International, has similar goals to compete with Cushman for a place among the top commercial brokerages. Now, BGC Partners is also in the game, hoping to change the industry by integrating Wall Street finance.