Between 2020 and 2022, the facade of 660 Fifth Avenue is being replaced as part of a renovation designed by Kohn Pedersen Fox. The new facade will consist of windows extending the full height of each story, measuring tall and wide. These panels would not contain any mullions. The glass panels would contain insulation, as opposed to the original facade, which was not insulated. The new facade would also triple the amount of window space at 660 Fifth Avenue. According to owner Brookfield Properties, these would be the "largest unitized windows in North America". The renovation also includes terraces on the three sides facing the surrounding roads. These terraces are being installed on the 8th, 10th, 11th, and 15th stories.
