The Chicago Plan Commission recently voted to approve a $700 million development that's planned to include the city’s sixth-tallest building when it's completed.

Planned to replace a parking lot across from Holy Name Cathedral at the corner of State Street and Chicago Avenue, the mixed-use project from JDL Development calls for a pair of towers rising a respective 49 and 76 stories over shared podium. After some post-unveiling changes, the now-thinner, taller tower is planned to top out at 1,011 ft to become the eighth Chicago skyscraper to exceed the 984-foot “supertall” classification.

芝加哥's Goettsch Partners along with Hartshorne Plunkard Architecture created the designwhich has changed since its debut在10月的一次公开会议上，还包括较短的塔楼的高度以及对建筑物的领奖台和上挫折的小调整。结构工程师Magnusson Klemencic Associates的首席执行官兼董事长Ron Klemencic指出，较高的塔楼将有两个质量阻尼器，整个开发项目将在其地下室使用一个Scant桩支撑系统，以在地下芝加哥运输机构红线红线附近的地点上地铁。克莱米奇说，高塔中的混凝土可能具有任何芝加哥塔的弹性模量最高。

"The most unusual part of that design is that we’re using very high-strength concrete," Klemencic says. "Not so much for its strength, but for its modulus of elasticity. 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."

芝加哥-based JDL development is planning to break ground by the end of the year on what will be its biggest project in company history.

"We're happy with the approval," Jim Letchinger, president and founder of JDL, says. "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."

奥尔德曼·布莱恩·霍普金斯（Alderman Brian Hopkins）的病房是芝加哥广场（One Chicago Square）的遗址，他说，过境改进计划将消除一些街道停车场，从而释放通行车道，以提高交通流量，并为长期讨论的计划提供了宽松的计划，以扩大芝加哥大道桥梁。