It has been a busy three years for both Kim Brennan and David Simon, who have worked together to lead Colliers International’s expansion in northern and central New Jersey. The global real estate services firm has grown to about 36 leasing and sales brokers in the market — roughly double the size of its team in 2015 — with an expanded focus on industrial, retail and investments sales. Colliers is also marking one year since it opened an office in Woodbridge, its third in New Jersey, to help support its long-term ambitions.