Third-party logistics firm M33 Integrated Solutions plans to expand its downtown Greensboro presence by early 2015 when it opens a 15,000-square-foot location in the former SunTrust branch building at 333 N. Greene St. while maintaining an existing 8,000-square-foot office nearby. The expansion will bring the total presence of M33 to about 23,000 square feet in downtown Greensboro and provide the company with room to grow. Scott Riddle, senior partner with M33 Integrated Solutions, said his company…