Architecture studio Snøhetta has carried out a series of renovations to the postmodern 550 Madison skyscraper, which was formerly known as the AT&T building.Snøhetta opened up some of the facades, added a public garden and improved ventilation and elevation systems as part of the conversion of the 647-foot-high (197-metre) skyscraper from a single-occupant tower into an office for multiple occupants.
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