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RRJ performed building enclosure consulting services on the residential portion of this iconic 100-story skyscraper to assess the 40+ year old insulating glass units (IGUs) glazed into the aluminum curtain wall due to the ongoing failures of the IGUs perimeter seals resulting in interpane fogging. Independent performance testing of the IGUs was performed along with a review of the curtain wall documents and replacement records. RRJ developed continuous testing and monitoring techniques of the IUGs resulting in the design and implementation of selective IGU replacements.