The Eurovision Song Contest 2014 took take place at the 'B&W Hallerne', which were some old industrial buildings. What were they originally used?

Explanation

The Eurovision Song Contest 2014 was the 59th annual Eurovision Song Contest. The contest took place at the B&W Hallerne, in Copenhagen, Denmark. Dane Emmelie de Forest's won the ESC in 2013 with the song "Only Teardrops". The shows was presented by Lise Rønne, Nikolaj Koppel and Pilou Asbæk. For the first in the history of the contest, the trio of presenters consisted of two men and one woman. It was the third time that Denmark hosted the contest, the last time being in 2001.