This week Snøhetta renovated Philip Johnson's AT&T building

This week on Dezeen, architecture studio Snøhetta unveiled its "surgical" renovation of the postmodern 550 Madison skyscraper in New York, formerly known as the AT&T building.
The Norwegian studio converted the 197-metre-high skyscraper designed by Philip Johnson from a single-occupancy into a multiple-occupancy building by opening up some of the facades, adding a public garden and improving its ventilation and elevation systems.
Snøhetta had originally drawn up a more elaborat