It recently staged Harvey Nicholls' first out-of-store fashion show away from London, along with a number of major exhibitions.
"This is a magnificent venue. Hopefully it will be important to Leeds and there will be spin-offs for the rest of Yorkshire. We will be able to bring functions here that would have been previously held outside the county," said Leeds United chairman Ken Bates.
The official opening featured performances from Tenors Unlimited, the Globe Girls, Jazz band Mr Swing, and 11-year-old comedian Jack Carroll, who suffers with cerebral palsy.
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