WILMINGTON, DEL. — Boxwood Industrial Park LLC, an affiliate company of Harvey, Hanna & Associates, has agreed to acquire the former General Motors assembly plant site, located at 801 Boxwood Road in Wilmington, for an undisclosed price. Wanxiang America Inc. is selling the 142-acre site, which includes more than 3 million square feet of former automobile manufacturing space, for an undisclosed price. Built in 1946, the site most notably served as a General Motors assembly plant until it closed in July 2009. The company plans to announce redevelopment plans for the site in the coming weeks.