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The World Financial Centre (WFC) in New York has a ground level shopping area known as the Courtyard. A replacement glazed facade to the Courtyard Entrances was to be provided and, given the high profile nature of the building, the design was required to be blast resilient. This paper demonstrates the design process and philosophy utilised in developing the blast resilient design and highlights how various design issues were investigated and resolved. The main challenge was the demonstration that long-span glass fins columns would not break under blast loading, particularly due to lateral torsional buckling during dynamic rebound. Dynamic interaction between various components of the façade was an important consideration while studying the dynamic response. The design of the glass fin friction grip splice connections was particularly challenging and required testing to be undertaken by Pilkington.