Sirosa and Arcadia’s plans for the reconfiguration and refurbishment of the Oxford Street Plaza Centre at Colegrave House, 70 Berners Street, include the creation of a new 73,500 sq ft flagship retail store, an enlarged double height office reception and a range of retail and gym extensions as well as enlarged offices for the Arcadia Group, which occupies around 125,000 sq ft of offices above the mall.