The Twenty Ninth Street, Boulder’s new retail district, is the new shopping center that replaces the old Crossroads Mall. Designed by SEM Architects and Communication Arts, this much anticipated shopping destination gets its name from the fact that Twenty Ninth Street goes directly down the center of the project with one and two story retail and office buildings on each side of the street. What makes this center unique is that the street and the buildings are constructed above a 900’ by 600’ pre-cast concrete parking structure. The parking structure becomes a long winding bridge across the structure that will support all the usual street traffic including cars, buses, bicycles, pedestrians and fire trucks.