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Unreliable citations may be challenged or deleted. As of 2014, CNA occupied 65 percent of the tower. The shorter red building was later restored to its original gray tone in 1999. The two buildings remain joined at the second floor: CNA’s Conference Center uses space on that floor, but all entrance and egress to it is through CNA Center. In 1999, a large fragment of a window fell from the building and killed a woman walking with her child. Windows had been cracking at the building ever since it had been built in 1975. 18 million to settle the resultant lawsuit.

All of the building’s windows were replaced in an expensive retrofit. File:Chicago Grant Park night pano. A computer program is used to calculate which windows need to be activated to create the proper message. Over 30 of the skyscrapers and some park features are labeled. Steve Daniels for Crain’s Chicago Business. Abraham Tekippe for Crain’s Chicago Business: Chicago Real Estate Daily.

Louise Kiernan for the Chicago Tribune. This page was last edited on 4 June 2017, at 15:05. Typically, the goal is to restore a stream of water to a more natural state. The term also refers to the public process toward such projects. A general consensus has developed that protecting and restoring natural creeks’ functions is achievable over time in an urban environment while recognizing the importance of property rights. At the heart are plants, trees, and the deep, healthy soils that support them.

Some efforts to blend urban development with natural systems use innovative drainage design and landscaping instead of traditional curbs and gutters, pipes and vaults. The project built bioswales, landscape elements intended to remove silt and pollution from surface runoff water and planted 100 evergreen trees and 1,100 shrubs. Such a reduction can reduce storm damage to water quality and habitats for species such as the iconic salmon. The Street Edge Alternatives Street breaks most of the conventions of 150 years of standard American street design. Narrow, curved streets, open drainage swales, and an abundance of diverse plants and trees welcome pedestrians as well as diverse species.