To service the building the Great Northern Viaduct was built parallel to the Cornbrook viaduct over the basin , and over Kenworthys Warehouse , and to mask it from Deansgate was the country 's longest Victorian commercial terrace .
To service the building the Great Northern Viaduct was built parallel to the Cornbrook viaduct over the basin , and over Kenworthys Warehouse . 
 To mask it from Deansgate was the country 's longest Victorian commercial terrace .