![]() ![]() “From a construction standpoint, one of the biggest challenges was coordinating tower crane tie-ins with curtain wall installation,” Steffenhagen says. MKA planned for a thickened slab at Level 10, tied the structure back to the core and created a platform to support the sloping floors from floors 10 through 19, Castillo says.Īnother challenge involved installing the curtain wall. Amenities are on seven floors of the building. Jahn lowered the ceiling heights of rental units to 9 ft, which allowed more amenity floors with higher ceilings. The building design was adapted to feature 70,000 sq ft of amenities space, including a resident lounge and shared demonstration kitchen, an art gallery, a fitness center and an indoor pool and spa overlooking an outdoor pool deck. ![]() The skyscraper is Helmut Jahn’s tallest building in Chicago. “The unit sizes and quantities were changed, and the MEP requirements for apartments are different than condos from an MEP standpoint.”Ĭastillo says the shift to apartments also prompted the need for more amenities, which generally are a larger program element in a rental than a condo building. “When the project shifted from condos to apartments, it required a coordinated redevelopment of the MEP design-build system,” says David Steffenhagen, senior project manager at McHugh Construction. The installation of the cantilever was observed on site by MKA to verify the final placement and to resolve any unexpected conflicts.Ĭhanging from condos to apartments created other challenges, including alterations needed for the mechanical, electrical and plumbing systems. “A full-size mock-up was created to verify these elements could all be placed within a very tight area while maintaining the necessary configuration.” The construction team addressed these issues in a preconstruction conference “where the construction challenges were discussed and best ideas expressed,” Fields says. The heavy bands take up a large volume within the slabs and compete for space in the grid of post-tensioning tendons. David Steffenhagen, Senior Project Manager, McHugh Construction “It required a coordinated redevelop-ment of the MEP design-build system.” The sloping columns at the south cantilever are tied back to the shear wall system via heavy bands of high-strength reinforcement in the adjoining slabs. The building’s overall lateral stability is ensured by a concrete shear wall core and buttress wall system, Fields says. ![]() ![]() “The challenge was to provide stability for these columns and resist the lateral forces with the same structural system that resists the wind forces.” “This geometry induces major lateral forces on the building, not unlike the horizontal forces felt during a windstorm,” Fields explains. “The biggest engineering obstacle from a design perspective was resolving the forces imposed by the cantilevered levels,” Castillo says. The cantilever was created by a series of sloping columns along the south face of the building from Level 11 to 20. “A more conventional approach, prismatically extending the building taller, could have added the same area, but much of it would have been taken up by additional elevator, stair, corridor and other unsalable spaces,” Fields says. Under the new design, the building fronting Michigan Avenue will still be Jahn’s tallest in Chicago, at 805 ft, rather than 832 ft in the original plans. Jahn reduced the building’s height by 27 ft and changed it to 738 apartments rather than the 506 condominiums it was originally planned for. The design and construction team on the 74-story skyscraper had to reconfigure the building from condos to apartments following the COVID-19 pandemic and in response to the evolving real estate market. Jahn took a two-volume approach to the tower’s design, creating a rectangular base and a carved tower that widens as it rises.ġ000M is 74 stories tall and contains 738 luxury apartments. ![]()
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