New Balance has just started the construction of a complex hosting its future world headquarters and other facilities in the Allston-Brighton area of Boston, at the western edge of the city. Boston's mayor, Thomas Menino, and the chairman of New Balance, Jim Davis, broke ground for the complex on Sept. 23. The $500 million project, to be called Boston Landing, will create a new cluster of buildings where New Balance's headquarters will be part of a broader sports and health district along the Massachusetts Turnpike. The company's new 250,000-square-foot head office will be the first building to emerge at the site, which will eventually include a hotel, 1.4 acres of open space, a new commuter rail station, and additional office and retail space. It will also feature a 300,000-square-foot sports area with a 200-meter indoor track and elite training facilities for baseball and hockey, including an NHL-sized rink.