The Chicago Plan Commission on Jan. 18 approved a $700-million development that, as presented, would include the city’s sixth-tallest building.
在州街和芝加哥大道的角落，JDL开发的混合用途项目呼吁一对塔 - 一个49层，另一个76个故事，以取代圣名大教堂的停车场。在一些揭幕后变化之后，更高的现在较薄的塔在1,011英尺处预先出现在1,011英尺，这将使它成为第八次芝加哥摩天大楼超过984英尺“超级空”分类。
Created by Chicago’s Goettsch Partners and Hartshorne Plunkard Architecture, the design has changed since its debut at a public meeting in October: It now includes a height increase for the shorter tower and minor tweaks to the building’s podium and upper setbacks. Ron Klemencic, CEO and chairman of structural engineer Magnusson Klemencic Associates, noted that the taller tower will have two mass dampers; further, in its basement, the whole development will use a secant-pile shoring system to secure a site near the Chicago Transit Authority’s Red Line subway. Klemencic said the concrete in the taller tower likely will have the highest modulus of elasticity of any Chicago tower.
“The most unusual part of that design is that we’re using very high-strength concrete, not so much for its strength but for its modulus of elasticity,” Klemencic says. “We need the stiffness. We’re specifying what is, in my experience, the highest modulus of elasticity in Chicago. It’s 7,000-KSI modulus.”
以芝加哥为基础的JDL希望在年底之前突破地面，是公司历史上最大的项目。
“We’re happy with the approval,” says Jim Letchinger, president and founder. “There were some changes the city made to lanes on Chicago Avenue to ease traffic concerns, but nothing in the actual project changed from what we brought to the planning commission.”
Alderman Brian Hopkins, whose ward includes the One Chicago Square site, said the transit improvement program will eliminate some street parking to free up lanes for better traffic flow as well as finance a plan to widen the Chicago Avenue bridge.
