Rebuilding works continued into Dingwall Avenue .
By 1976 Allders had 1,700 staff and 500,000 square feet ( 46,000 m2 ) of floor space .
Rebuilding works continued into Dingwall Avenue and by 1976 Allders had 1,700 staff and 500,000 square feet ( 46,000 m2 ) of floor space .