Marina City, Chicago
Marina City, the landmark structure located along the Chicago River in downtown Chicago, will celebrate its 50th birthday in 2014. Marina City is a mixed-use building complex highlighted by twin, corncob-shaped residential towers constructed of exposed reinforced concrete. When completed in 1964, the twin towers were the both the tallest residential buildings and the tallest reinforced concrete structures in the world.
Trump International Hotel and Tower, Chicago
Designed by Skidmore, Owings & Merrill LLP (SOM) Chicago's 92-story Trump Tower will be the tallest concrete building in the United States, and the tallest building built in North America since the completion of Sears Tower in 1974. Reaching a height of 1134 ft. (1362 ft. including the spire) above grade, the 2.6 million-square foot structure includes condominium, service apartments, health club, parking, and retail functions. Reinforced concrete was selected as the material of choice based on its high stiffness, mass, damping, and superb acoustical properties.
Astor Place Tower, New York, New York
This $50-million “rotational, asymmetrical structure” includes mixed-use commercial space and a residential condominium tower. The complex contains 39 luxury residential loft units, 13,000 square feet of retail space, a below-grade parking garage for residents’ cars, and penthouse gallery space for Cooper Union, the owner of the site. A reinforced concrete flat plate system with shear walls was chosen for Astor Place, as it provides the most economical structural system for the project’s intricate architectural and programmatic layout.