(Left to Right) New York City Mayor Michael Bloomberg signs the first segment of the platform to be installed in the Manhattan West development as Ann Weisbrod, President of the Hudson Yards Development Corporation, John Zuccotti, Co-Chairman of Brookfield Office Properties, Port Authority of New York and New Jersey Executive Director Patrick Foye, Ric Clark, CEO of Brookfied Property Group, Dennis Friedrich, CEO of Brookfield Office Properties, and Manhattan Borough President Scott Stringer watch during a groundbreaking ceremony in New York, January 15, 2013. The concrete segment is part of an innovative technology that will create a platform over the train tracks at the site. Keith Bedford/Brookfield Office Properties