It used to be 'disco-pub IDEA'. I used to go there in my teens. It was an open air bar/club with awnings strung between trees. At the time most clubs were open air-Ku(now priviledge),amnesia terrace, Es Paradise. The local authorities imposed noise restrictions stating music should not be heard outside the venues after midnight. All the clubs then built a roof. Priviledge was shut because the owner could not afford to put a roof on at the time. I think it was closed for about 5 years.
The steel construction was for the roof of 'Idea' it was built one winter prob 20 years ago but never got further. Various rumours- owner ran out of money,no planning permission, who knows. It is a real eyesore maybe with the new laws comining into affect( i.e. owners will have to maintain exteriors of buildings to a certain standard) mean something will now be done about it!
The entrance to the original 'idea' is still there, it is used for posters now.
With all the fuss about closures, police etc this year, those who have been going to ibiza for a long time will know this has happened before when authorities made clubs build a roof(how Space got away with the open terrace all those years?!). The club scene then went into decline for a while but reinvented itself.
Have no fear people, Ibiza constantly reinvents itself sometimes for better, sometimes for worse but it has always had and i'm sure it always will have the party vibe. I've been holidaying there for 28 years!