On October 16, 2006, a groundbreaking ceremony was held to mark the symbolic start of a $1.7 billion expansion project. The project, which would have expanded the center's size by 45 percent, was scheduled for completion by 2010. Architect Richard Rogers led the design team, and Leslie E. Robertson Associates were the structural engineers. However, the physical constraints on the project site imposed by the Bloomberg administration complicated the design and caused the cost to soar to $5 billion. To address the site constraint, an alternative plan produced in 2007 by Meta Brunzema, an architect, and Daniel Gutman, an environmental planner, for the Hell's Kitchen Neighborhood Association would have expanded the Javits Center south over the Western Rail Yard, the site of the defeated West Side Stadium. Other features of the HKNA plan included an rooftop park, office and residential towers at the corners of the new exhibition hall, and conversion of Pier 76 to public use. In the end, the Mayor ignored the HKNA plan, and proposed to rezone the Western Rail Yard site for commercial and residential development as part of the Hudson Yards.